13444 lines
386 KiB
C
13444 lines
386 KiB
C
/* ELF linking support for BFD.
|
||
Copyright (C) 1995-2015 Free Software Foundation, Inc.
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||
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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||
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||
You should have received a copy of the GNU General Public License
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||
along with this program; if not, write to the Free Software
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||
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfd_stdint.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#define ARCH_SIZE 0
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#include "elf-bfd.h"
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#include "safe-ctype.h"
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#include "libiberty.h"
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#include "objalloc.h"
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/* This struct is used to pass information to routines called via
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elf_link_hash_traverse which must return failure. */
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struct elf_info_failed
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{
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struct bfd_link_info *info;
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bfd_boolean failed;
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};
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/* This structure is used to pass information to
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_bfd_elf_link_find_version_dependencies. */
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struct elf_find_verdep_info
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{
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/* General link information. */
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struct bfd_link_info *info;
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/* The number of dependencies. */
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unsigned int vers;
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/* Whether we had a failure. */
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bfd_boolean failed;
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};
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static bfd_boolean _bfd_elf_fix_symbol_flags
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(struct elf_link_hash_entry *, struct elf_info_failed *);
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asection *
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_bfd_elf_section_for_symbol (struct elf_reloc_cookie *cookie,
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unsigned long r_symndx,
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bfd_boolean discard)
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{
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if (r_symndx >= cookie->locsymcount
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|| ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
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{
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struct elf_link_hash_entry *h;
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h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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if ((h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
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&& discarded_section (h->root.u.def.section))
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return h->root.u.def.section;
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else
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return NULL;
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}
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else
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{
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/* It's not a relocation against a global symbol,
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but it could be a relocation against a local
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symbol for a discarded section. */
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asection *isec;
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Elf_Internal_Sym *isym;
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/* Need to: get the symbol; get the section. */
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isym = &cookie->locsyms[r_symndx];
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isec = bfd_section_from_elf_index (cookie->abfd, isym->st_shndx);
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if (isec != NULL
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&& discard ? discarded_section (isec) : 1)
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return isec;
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}
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return NULL;
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}
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/* Define a symbol in a dynamic linkage section. */
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struct elf_link_hash_entry *
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_bfd_elf_define_linkage_sym (bfd *abfd,
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struct bfd_link_info *info,
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asection *sec,
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const char *name)
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{
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struct elf_link_hash_entry *h;
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struct bfd_link_hash_entry *bh;
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const struct elf_backend_data *bed;
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h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
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if (h != NULL)
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{
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/* Zap symbol defined in an as-needed lib that wasn't linked.
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This is a symptom of a larger problem: Absolute symbols
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defined in shared libraries can't be overridden, because we
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lose the link to the bfd which is via the symbol section. */
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h->root.type = bfd_link_hash_new;
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}
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bh = &h->root;
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bed = get_elf_backend_data (abfd);
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if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
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sec, 0, NULL, FALSE, bed->collect,
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&bh))
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return NULL;
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h = (struct elf_link_hash_entry *) bh;
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h->def_regular = 1;
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h->non_elf = 0;
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h->root.linker_def = 1;
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h->type = STT_OBJECT;
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if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
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h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
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(*bed->elf_backend_hide_symbol) (info, h, TRUE);
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return h;
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||
}
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bfd_boolean
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_bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
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{
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flagword flags;
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asection *s;
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struct elf_link_hash_entry *h;
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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struct elf_link_hash_table *htab = elf_hash_table (info);
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/* This function may be called more than once. */
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s = bfd_get_linker_section (abfd, ".got");
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if (s != NULL)
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return TRUE;
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flags = bed->dynamic_sec_flags;
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s = bfd_make_section_anyway_with_flags (abfd,
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(bed->rela_plts_and_copies_p
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? ".rela.got" : ".rel.got"),
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(bed->dynamic_sec_flags
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| SEC_READONLY));
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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htab->srelgot = s;
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s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
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if (s == NULL
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|| !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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htab->sgot = s;
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if (bed->want_got_plt)
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{
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s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
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if (s == NULL
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|| !bfd_set_section_alignment (abfd, s,
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bed->s->log_file_align))
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return FALSE;
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htab->sgotplt = s;
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}
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/* The first bit of the global offset table is the header. */
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s->size += bed->got_header_size;
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if (bed->want_got_sym)
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{
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/* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
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(or .got.plt) section. We don't do this in the linker script
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because we don't want to define the symbol if we are not creating
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a global offset table. */
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h = _bfd_elf_define_linkage_sym (abfd, info, s,
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"_GLOBAL_OFFSET_TABLE_");
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elf_hash_table (info)->hgot = h;
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if (h == NULL)
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return FALSE;
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||
}
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||
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return TRUE;
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||
}
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||
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/* Create a strtab to hold the dynamic symbol names. */
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||
static bfd_boolean
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_bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
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{
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struct elf_link_hash_table *hash_table;
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hash_table = elf_hash_table (info);
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if (hash_table->dynobj == NULL)
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hash_table->dynobj = abfd;
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if (hash_table->dynstr == NULL)
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{
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hash_table->dynstr = _bfd_elf_strtab_init ();
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if (hash_table->dynstr == NULL)
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return FALSE;
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}
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return TRUE;
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}
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/* Create some sections which will be filled in with dynamic linking
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information. ABFD is an input file which requires dynamic sections
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to be created. The dynamic sections take up virtual memory space
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when the final executable is run, so we need to create them before
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addresses are assigned to the output sections. We work out the
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actual contents and size of these sections later. */
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bfd_boolean
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_bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
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{
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flagword flags;
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asection *s;
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const struct elf_backend_data *bed;
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struct elf_link_hash_entry *h;
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if (! is_elf_hash_table (info->hash))
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return FALSE;
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if (elf_hash_table (info)->dynamic_sections_created)
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return TRUE;
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if (!_bfd_elf_link_create_dynstrtab (abfd, info))
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return FALSE;
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abfd = elf_hash_table (info)->dynobj;
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bed = get_elf_backend_data (abfd);
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flags = bed->dynamic_sec_flags;
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/* A dynamically linked executable has a .interp section, but a
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shared library does not. */
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if (info->executable)
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{
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s = bfd_make_section_anyway_with_flags (abfd, ".interp",
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flags | SEC_READONLY);
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if (s == NULL)
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return FALSE;
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}
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/* Create sections to hold version informations. These are removed
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if they are not needed. */
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s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
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flags | SEC_READONLY);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
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flags | SEC_READONLY);
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||
if (s == NULL
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||
|| ! bfd_set_section_alignment (abfd, s, 1))
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return FALSE;
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||
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||
s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
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flags | SEC_READONLY);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
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flags | SEC_READONLY);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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||
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s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
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||
flags | SEC_READONLY);
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if (s == NULL)
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return FALSE;
|
||
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s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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||
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/* The special symbol _DYNAMIC is always set to the start of the
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.dynamic section. We could set _DYNAMIC in a linker script, but we
|
||
only want to define it if we are, in fact, creating a .dynamic
|
||
section. We don't want to define it if there is no .dynamic
|
||
section, since on some ELF platforms the start up code examines it
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to decide how to initialize the process. */
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h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
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elf_hash_table (info)->hdynamic = h;
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if (h == NULL)
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return FALSE;
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|
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if (info->emit_hash)
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{
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||
s = bfd_make_section_anyway_with_flags (abfd, ".hash",
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flags | SEC_READONLY);
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if (s == NULL
|
||
|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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||
return FALSE;
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||
elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
|
||
}
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||
|
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if (info->emit_gnu_hash)
|
||
{
|
||
s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
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flags | SEC_READONLY);
|
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if (s == NULL
|
||
|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
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return FALSE;
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||
/* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
|
||
4 32-bit words followed by variable count of 64-bit words, then
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||
variable count of 32-bit words. */
|
||
if (bed->s->arch_size == 64)
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||
elf_section_data (s)->this_hdr.sh_entsize = 0;
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||
else
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elf_section_data (s)->this_hdr.sh_entsize = 4;
|
||
}
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||
|
||
/* Let the backend create the rest of the sections. This lets the
|
||
backend set the right flags. The backend will normally create
|
||
the .got and .plt sections. */
|
||
if (bed->elf_backend_create_dynamic_sections == NULL
|
||
|| ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
|
||
return FALSE;
|
||
|
||
elf_hash_table (info)->dynamic_sections_created = TRUE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Create dynamic sections when linking against a dynamic object. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
flagword flags, pltflags;
|
||
struct elf_link_hash_entry *h;
|
||
asection *s;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct elf_link_hash_table *htab = elf_hash_table (info);
|
||
|
||
/* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
|
||
.rel[a].bss sections. */
|
||
flags = bed->dynamic_sec_flags;
|
||
|
||
pltflags = flags;
|
||
if (bed->plt_not_loaded)
|
||
/* We do not clear SEC_ALLOC here because we still want the OS to
|
||
allocate space for the section; it's just that there's nothing
|
||
to read in from the object file. */
|
||
pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
|
||
else
|
||
pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
|
||
if (bed->plt_readonly)
|
||
pltflags |= SEC_READONLY;
|
||
|
||
s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
|
||
if (s == NULL
|
||
|| ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
|
||
return FALSE;
|
||
htab->splt = s;
|
||
|
||
/* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
|
||
.plt section. */
|
||
if (bed->want_plt_sym)
|
||
{
|
||
h = _bfd_elf_define_linkage_sym (abfd, info, s,
|
||
"_PROCEDURE_LINKAGE_TABLE_");
|
||
elf_hash_table (info)->hplt = h;
|
||
if (h == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
s = bfd_make_section_anyway_with_flags (abfd,
|
||
(bed->rela_plts_and_copies_p
|
||
? ".rela.plt" : ".rel.plt"),
|
||
flags | SEC_READONLY);
|
||
if (s == NULL
|
||
|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
|
||
return FALSE;
|
||
htab->srelplt = s;
|
||
|
||
if (! _bfd_elf_create_got_section (abfd, info))
|
||
return FALSE;
|
||
|
||
if (bed->want_dynbss)
|
||
{
|
||
/* The .dynbss section is a place to put symbols which are defined
|
||
by dynamic objects, are referenced by regular objects, and are
|
||
not functions. We must allocate space for them in the process
|
||
image and use a R_*_COPY reloc to tell the dynamic linker to
|
||
initialize them at run time. The linker script puts the .dynbss
|
||
section into the .bss section of the final image. */
|
||
s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
|
||
(SEC_ALLOC | SEC_LINKER_CREATED));
|
||
if (s == NULL)
|
||
return FALSE;
|
||
|
||
/* The .rel[a].bss section holds copy relocs. This section is not
|
||
normally needed. We need to create it here, though, so that the
|
||
linker will map it to an output section. We can't just create it
|
||
only if we need it, because we will not know whether we need it
|
||
until we have seen all the input files, and the first time the
|
||
main linker code calls BFD after examining all the input files
|
||
(size_dynamic_sections) the input sections have already been
|
||
mapped to the output sections. If the section turns out not to
|
||
be needed, we can discard it later. We will never need this
|
||
section when generating a shared object, since they do not use
|
||
copy relocs. */
|
||
if (! info->shared)
|
||
{
|
||
s = bfd_make_section_anyway_with_flags (abfd,
|
||
(bed->rela_plts_and_copies_p
|
||
? ".rela.bss" : ".rel.bss"),
|
||
flags | SEC_READONLY);
|
||
if (s == NULL
|
||
|| ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Record a new dynamic symbol. We record the dynamic symbols as we
|
||
read the input files, since we need to have a list of all of them
|
||
before we can determine the final sizes of the output sections.
|
||
Note that we may actually call this function even though we are not
|
||
going to output any dynamic symbols; in some cases we know that a
|
||
symbol should be in the dynamic symbol table, but only if there is
|
||
one. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
if (h->dynindx == -1)
|
||
{
|
||
struct elf_strtab_hash *dynstr;
|
||
char *p;
|
||
const char *name;
|
||
bfd_size_type indx;
|
||
|
||
/* XXX: The ABI draft says the linker must turn hidden and
|
||
internal symbols into STB_LOCAL symbols when producing the
|
||
DSO. However, if ld.so honors st_other in the dynamic table,
|
||
this would not be necessary. */
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_INTERNAL:
|
||
case STV_HIDDEN:
|
||
if (h->root.type != bfd_link_hash_undefined
|
||
&& h->root.type != bfd_link_hash_undefweak)
|
||
{
|
||
h->forced_local = 1;
|
||
if (!elf_hash_table (info)->is_relocatable_executable)
|
||
return TRUE;
|
||
}
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
h->dynindx = elf_hash_table (info)->dynsymcount;
|
||
++elf_hash_table (info)->dynsymcount;
|
||
|
||
dynstr = elf_hash_table (info)->dynstr;
|
||
if (dynstr == NULL)
|
||
{
|
||
/* Create a strtab to hold the dynamic symbol names. */
|
||
elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
|
||
if (dynstr == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* We don't put any version information in the dynamic string
|
||
table. */
|
||
name = h->root.root.string;
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL)
|
||
/* We know that the p points into writable memory. In fact,
|
||
there are only a few symbols that have read-only names, being
|
||
those like _GLOBAL_OFFSET_TABLE_ that are created specially
|
||
by the backends. Most symbols will have names pointing into
|
||
an ELF string table read from a file, or to objalloc memory. */
|
||
*p = 0;
|
||
|
||
indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
|
||
|
||
if (p != NULL)
|
||
*p = ELF_VER_CHR;
|
||
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
h->dynstr_index = indx;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Mark a symbol dynamic. */
|
||
|
||
static void
|
||
bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
struct bfd_elf_dynamic_list *d = info->dynamic_list;
|
||
|
||
/* It may be called more than once on the same H. */
|
||
if(h->dynamic || info->relocatable)
|
||
return;
|
||
|
||
if ((info->dynamic_data
|
||
&& (h->type == STT_OBJECT
|
||
|| (sym != NULL
|
||
&& ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
|
||
|| (d != NULL
|
||
&& h->root.type == bfd_link_hash_new
|
||
&& (*d->match) (&d->head, NULL, h->root.root.string)))
|
||
h->dynamic = 1;
|
||
}
|
||
|
||
/* Record an assignment to a symbol made by a linker script. We need
|
||
this in case some dynamic object refers to this symbol. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_record_link_assignment (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
const char *name,
|
||
bfd_boolean provide,
|
||
bfd_boolean hidden)
|
||
{
|
||
struct elf_link_hash_entry *h, *hv;
|
||
struct elf_link_hash_table *htab;
|
||
const struct elf_backend_data *bed;
|
||
|
||
if (!is_elf_hash_table (info->hash))
|
||
return TRUE;
|
||
|
||
htab = elf_hash_table (info);
|
||
h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
|
||
if (h == NULL)
|
||
return provide;
|
||
|
||
switch (h->root.type)
|
||
{
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
case bfd_link_hash_common:
|
||
break;
|
||
case bfd_link_hash_undefweak:
|
||
case bfd_link_hash_undefined:
|
||
/* Since we're defining the symbol, don't let it seem to have not
|
||
been defined. record_dynamic_symbol and size_dynamic_sections
|
||
may depend on this. */
|
||
h->root.type = bfd_link_hash_new;
|
||
if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
|
||
bfd_link_repair_undef_list (&htab->root);
|
||
break;
|
||
case bfd_link_hash_new:
|
||
bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
|
||
h->non_elf = 0;
|
||
break;
|
||
case bfd_link_hash_indirect:
|
||
/* We had a versioned symbol in a dynamic library. We make the
|
||
the versioned symbol point to this one. */
|
||
bed = get_elf_backend_data (output_bfd);
|
||
hv = h;
|
||
while (hv->root.type == bfd_link_hash_indirect
|
||
|| hv->root.type == bfd_link_hash_warning)
|
||
hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
|
||
/* We don't need to update h->root.u since linker will set them
|
||
later. */
|
||
h->root.type = bfd_link_hash_undefined;
|
||
hv->root.type = bfd_link_hash_indirect;
|
||
hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
|
||
(*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
|
||
break;
|
||
case bfd_link_hash_warning:
|
||
abort ();
|
||
break;
|
||
}
|
||
|
||
/* If this symbol is being provided by the linker script, and it is
|
||
currently defined by a dynamic object, but not by a regular
|
||
object, then mark it as undefined so that the generic linker will
|
||
force the correct value. */
|
||
if (provide
|
||
&& h->def_dynamic
|
||
&& !h->def_regular)
|
||
h->root.type = bfd_link_hash_undefined;
|
||
|
||
/* If this symbol is not being provided by the linker script, and it is
|
||
currently defined by a dynamic object, but not by a regular object,
|
||
then clear out any version information because the symbol will not be
|
||
associated with the dynamic object any more. */
|
||
if (!provide
|
||
&& h->def_dynamic
|
||
&& !h->def_regular)
|
||
h->verinfo.verdef = NULL;
|
||
|
||
h->def_regular = 1;
|
||
|
||
if (hidden)
|
||
{
|
||
bed = get_elf_backend_data (output_bfd);
|
||
if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
|
||
h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
}
|
||
|
||
/* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
|
||
and executables. */
|
||
if (!info->relocatable
|
||
&& h->dynindx != -1
|
||
&& (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
|
||
|| ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
|
||
h->forced_local = 1;
|
||
|
||
if ((h->def_dynamic
|
||
|| h->ref_dynamic
|
||
|| info->shared
|
||
|| (info->executable && elf_hash_table (info)->is_relocatable_executable))
|
||
&& h->dynindx == -1)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
|
||
/* If this is a weak defined symbol, and we know a corresponding
|
||
real symbol from the same dynamic object, make sure the real
|
||
symbol is also made into a dynamic symbol. */
|
||
if (h->u.weakdef != NULL
|
||
&& h->u.weakdef->dynindx == -1)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Record a new local dynamic symbol. Returns 0 on failure, 1 on
|
||
success, and 2 on a failure caused by attempting to record a symbol
|
||
in a discarded section, eg. a discarded link-once section symbol. */
|
||
|
||
int
|
||
bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
|
||
bfd *input_bfd,
|
||
long input_indx)
|
||
{
|
||
bfd_size_type amt;
|
||
struct elf_link_local_dynamic_entry *entry;
|
||
struct elf_link_hash_table *eht;
|
||
struct elf_strtab_hash *dynstr;
|
||
unsigned long dynstr_index;
|
||
char *name;
|
||
Elf_External_Sym_Shndx eshndx;
|
||
char esym[sizeof (Elf64_External_Sym)];
|
||
|
||
if (! is_elf_hash_table (info->hash))
|
||
return 0;
|
||
|
||
/* See if the entry exists already. */
|
||
for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
|
||
if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
|
||
return 1;
|
||
|
||
amt = sizeof (*entry);
|
||
entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
|
||
if (entry == NULL)
|
||
return 0;
|
||
|
||
/* Go find the symbol, so that we can find it's name. */
|
||
if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
|
||
1, input_indx, &entry->isym, esym, &eshndx))
|
||
{
|
||
bfd_release (input_bfd, entry);
|
||
return 0;
|
||
}
|
||
|
||
if (entry->isym.st_shndx != SHN_UNDEF
|
||
&& entry->isym.st_shndx < SHN_LORESERVE)
|
||
{
|
||
asection *s;
|
||
|
||
s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
|
||
if (s == NULL || bfd_is_abs_section (s->output_section))
|
||
{
|
||
/* We can still bfd_release here as nothing has done another
|
||
bfd_alloc. We can't do this later in this function. */
|
||
bfd_release (input_bfd, entry);
|
||
return 2;
|
||
}
|
||
}
|
||
|
||
name = (bfd_elf_string_from_elf_section
|
||
(input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
|
||
entry->isym.st_name));
|
||
|
||
dynstr = elf_hash_table (info)->dynstr;
|
||
if (dynstr == NULL)
|
||
{
|
||
/* Create a strtab to hold the dynamic symbol names. */
|
||
elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
|
||
if (dynstr == NULL)
|
||
return 0;
|
||
}
|
||
|
||
dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
|
||
if (dynstr_index == (unsigned long) -1)
|
||
return 0;
|
||
entry->isym.st_name = dynstr_index;
|
||
|
||
eht = elf_hash_table (info);
|
||
|
||
entry->next = eht->dynlocal;
|
||
eht->dynlocal = entry;
|
||
entry->input_bfd = input_bfd;
|
||
entry->input_indx = input_indx;
|
||
eht->dynsymcount++;
|
||
|
||
/* Whatever binding the symbol had before, it's now local. */
|
||
entry->isym.st_info
|
||
= ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
|
||
|
||
/* The dynindx will be set at the end of size_dynamic_sections. */
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Return the dynindex of a local dynamic symbol. */
|
||
|
||
long
|
||
_bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
|
||
bfd *input_bfd,
|
||
long input_indx)
|
||
{
|
||
struct elf_link_local_dynamic_entry *e;
|
||
|
||
for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
|
||
if (e->input_bfd == input_bfd && e->input_indx == input_indx)
|
||
return e->dynindx;
|
||
return -1;
|
||
}
|
||
|
||
/* This function is used to renumber the dynamic symbols, if some of
|
||
them are removed because they are marked as local. This is called
|
||
via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
|
||
void *data)
|
||
{
|
||
size_t *count = (size_t *) data;
|
||
|
||
if (h->forced_local)
|
||
return TRUE;
|
||
|
||
if (h->dynindx != -1)
|
||
h->dynindx = ++(*count);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
|
||
STB_LOCAL binding. */
|
||
|
||
static bfd_boolean
|
||
elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
|
||
void *data)
|
||
{
|
||
size_t *count = (size_t *) data;
|
||
|
||
if (!h->forced_local)
|
||
return TRUE;
|
||
|
||
if (h->dynindx != -1)
|
||
h->dynindx = ++(*count);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return true if the dynamic symbol for a given section should be
|
||
omitted when creating a shared library. */
|
||
bfd_boolean
|
||
_bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
|
||
struct bfd_link_info *info,
|
||
asection *p)
|
||
{
|
||
struct elf_link_hash_table *htab;
|
||
asection *ip;
|
||
|
||
switch (elf_section_data (p)->this_hdr.sh_type)
|
||
{
|
||
case SHT_PROGBITS:
|
||
case SHT_NOBITS:
|
||
/* If sh_type is yet undecided, assume it could be
|
||
SHT_PROGBITS/SHT_NOBITS. */
|
||
case SHT_NULL:
|
||
htab = elf_hash_table (info);
|
||
if (p == htab->tls_sec)
|
||
return FALSE;
|
||
|
||
if (htab->text_index_section != NULL)
|
||
return p != htab->text_index_section && p != htab->data_index_section;
|
||
|
||
return (htab->dynobj != NULL
|
||
&& (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
|
||
&& ip->output_section == p);
|
||
|
||
/* There shouldn't be section relative relocations
|
||
against any other section. */
|
||
default:
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
/* Assign dynsym indices. In a shared library we generate a section
|
||
symbol for each output section, which come first. Next come symbols
|
||
which have been forced to local binding. Then all of the back-end
|
||
allocated local dynamic syms, followed by the rest of the global
|
||
symbols. */
|
||
|
||
static unsigned long
|
||
_bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
unsigned long *section_sym_count)
|
||
{
|
||
unsigned long dynsymcount = 0;
|
||
|
||
if (info->shared || elf_hash_table (info)->is_relocatable_executable)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
|
||
asection *p;
|
||
for (p = output_bfd->sections; p ; p = p->next)
|
||
if ((p->flags & SEC_EXCLUDE) == 0
|
||
&& (p->flags & SEC_ALLOC) != 0
|
||
&& !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
|
||
elf_section_data (p)->dynindx = ++dynsymcount;
|
||
else
|
||
elf_section_data (p)->dynindx = 0;
|
||
}
|
||
*section_sym_count = dynsymcount;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_link_renumber_local_hash_table_dynsyms,
|
||
&dynsymcount);
|
||
|
||
if (elf_hash_table (info)->dynlocal)
|
||
{
|
||
struct elf_link_local_dynamic_entry *p;
|
||
for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
|
||
p->dynindx = ++dynsymcount;
|
||
}
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_link_renumber_hash_table_dynsyms,
|
||
&dynsymcount);
|
||
|
||
/* There is an unused NULL entry at the head of the table which
|
||
we must account for in our count. Unless there weren't any
|
||
symbols, which means we'll have no table at all. */
|
||
if (dynsymcount != 0)
|
||
++dynsymcount;
|
||
|
||
elf_hash_table (info)->dynsymcount = dynsymcount;
|
||
return dynsymcount;
|
||
}
|
||
|
||
/* Merge st_other field. */
|
||
|
||
static void
|
||
elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
|
||
const Elf_Internal_Sym *isym, asection *sec,
|
||
bfd_boolean definition, bfd_boolean dynamic)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
|
||
/* If st_other has a processor-specific meaning, specific
|
||
code might be needed here. */
|
||
if (bed->elf_backend_merge_symbol_attribute)
|
||
(*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
|
||
dynamic);
|
||
|
||
if (!dynamic)
|
||
{
|
||
unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
|
||
unsigned hvis = ELF_ST_VISIBILITY (h->other);
|
||
|
||
/* Keep the most constraining visibility. Leave the remainder
|
||
of the st_other field to elf_backend_merge_symbol_attribute. */
|
||
if (symvis - 1 < hvis - 1)
|
||
h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
|
||
}
|
||
else if (definition
|
||
&& ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
|
||
&& (sec->flags & SEC_READONLY) == 0)
|
||
h->protected_def = 1;
|
||
}
|
||
|
||
/* This function is called when we want to merge a new symbol with an
|
||
existing symbol. It handles the various cases which arise when we
|
||
find a definition in a dynamic object, or when there is already a
|
||
definition in a dynamic object. The new symbol is described by
|
||
NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
|
||
entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
|
||
if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
|
||
of an old common symbol. We set OVERRIDE if the old symbol is
|
||
overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
|
||
the type to change. We set SIZE_CHANGE_OK if it is OK for the size
|
||
to change. By OK to change, we mean that we shouldn't warn if the
|
||
type or size does change. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_merge_symbol (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
const char *name,
|
||
Elf_Internal_Sym *sym,
|
||
asection **psec,
|
||
bfd_vma *pvalue,
|
||
struct elf_link_hash_entry **sym_hash,
|
||
bfd **poldbfd,
|
||
bfd_boolean *pold_weak,
|
||
unsigned int *pold_alignment,
|
||
bfd_boolean *skip,
|
||
bfd_boolean *override,
|
||
bfd_boolean *type_change_ok,
|
||
bfd_boolean *size_change_ok)
|
||
{
|
||
asection *sec, *oldsec;
|
||
struct elf_link_hash_entry *h;
|
||
struct elf_link_hash_entry *hi;
|
||
struct elf_link_hash_entry *flip;
|
||
int bind;
|
||
bfd *oldbfd;
|
||
bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
|
||
bfd_boolean newweak, oldweak, newfunc, oldfunc;
|
||
const struct elf_backend_data *bed;
|
||
|
||
*skip = FALSE;
|
||
*override = FALSE;
|
||
|
||
sec = *psec;
|
||
bind = ELF_ST_BIND (sym->st_info);
|
||
|
||
if (! bfd_is_und_section (sec))
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
|
||
else
|
||
h = ((struct elf_link_hash_entry *)
|
||
bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
|
||
if (h == NULL)
|
||
return FALSE;
|
||
*sym_hash = h;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
/* For merging, we only care about real symbols. But we need to make
|
||
sure that indirect symbol dynamic flags are updated. */
|
||
hi = h;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
|
||
existing symbol. */
|
||
|
||
oldbfd = NULL;
|
||
oldsec = NULL;
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
oldbfd = h->root.u.undef.abfd;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
oldbfd = h->root.u.def.section->owner;
|
||
oldsec = h->root.u.def.section;
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
oldbfd = h->root.u.c.p->section->owner;
|
||
oldsec = h->root.u.c.p->section;
|
||
if (pold_alignment)
|
||
*pold_alignment = h->root.u.c.p->alignment_power;
|
||
break;
|
||
}
|
||
if (poldbfd && *poldbfd == NULL)
|
||
*poldbfd = oldbfd;
|
||
|
||
/* Differentiate strong and weak symbols. */
|
||
newweak = bind == STB_WEAK;
|
||
oldweak = (h->root.type == bfd_link_hash_defweak
|
||
|| h->root.type == bfd_link_hash_undefweak);
|
||
if (pold_weak)
|
||
*pold_weak = oldweak;
|
||
|
||
/* This code is for coping with dynamic objects, and is only useful
|
||
if we are doing an ELF link. */
|
||
if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
|
||
return TRUE;
|
||
|
||
/* We have to check it for every instance since the first few may be
|
||
references and not all compilers emit symbol type for undefined
|
||
symbols. */
|
||
bfd_elf_link_mark_dynamic_symbol (info, h, sym);
|
||
|
||
/* NEWDYN and OLDDYN indicate whether the new or old symbol,
|
||
respectively, is from a dynamic object. */
|
||
|
||
newdyn = (abfd->flags & DYNAMIC) != 0;
|
||
|
||
/* ref_dynamic_nonweak and dynamic_def flags track actual undefined
|
||
syms and defined syms in dynamic libraries respectively.
|
||
ref_dynamic on the other hand can be set for a symbol defined in
|
||
a dynamic library, and def_dynamic may not be set; When the
|
||
definition in a dynamic lib is overridden by a definition in the
|
||
executable use of the symbol in the dynamic lib becomes a
|
||
reference to the executable symbol. */
|
||
if (newdyn)
|
||
{
|
||
if (bfd_is_und_section (sec))
|
||
{
|
||
if (bind != STB_WEAK)
|
||
{
|
||
h->ref_dynamic_nonweak = 1;
|
||
hi->ref_dynamic_nonweak = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
h->dynamic_def = 1;
|
||
hi->dynamic_def = 1;
|
||
}
|
||
}
|
||
|
||
/* If we just created the symbol, mark it as being an ELF symbol.
|
||
Other than that, there is nothing to do--there is no merge issue
|
||
with a newly defined symbol--so we just return. */
|
||
|
||
if (h->root.type == bfd_link_hash_new)
|
||
{
|
||
h->non_elf = 0;
|
||
return TRUE;
|
||
}
|
||
|
||
/* In cases involving weak versioned symbols, we may wind up trying
|
||
to merge a symbol with itself. Catch that here, to avoid the
|
||
confusion that results if we try to override a symbol with
|
||
itself. The additional tests catch cases like
|
||
_GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
|
||
dynamic object, which we do want to handle here. */
|
||
if (abfd == oldbfd
|
||
&& (newweak || oldweak)
|
||
&& ((abfd->flags & DYNAMIC) == 0
|
||
|| !h->def_regular))
|
||
return TRUE;
|
||
|
||
olddyn = FALSE;
|
||
if (oldbfd != NULL)
|
||
olddyn = (oldbfd->flags & DYNAMIC) != 0;
|
||
else if (oldsec != NULL)
|
||
{
|
||
/* This handles the special SHN_MIPS_{TEXT,DATA} section
|
||
indices used by MIPS ELF. */
|
||
olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
|
||
}
|
||
|
||
/* NEWDEF and OLDDEF indicate whether the new or old symbol,
|
||
respectively, appear to be a definition rather than reference. */
|
||
|
||
newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
|
||
|
||
olddef = (h->root.type != bfd_link_hash_undefined
|
||
&& h->root.type != bfd_link_hash_undefweak
|
||
&& h->root.type != bfd_link_hash_common);
|
||
|
||
/* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
|
||
respectively, appear to be a function. */
|
||
|
||
newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
|
||
&& bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
|
||
|
||
oldfunc = (h->type != STT_NOTYPE
|
||
&& bed->is_function_type (h->type));
|
||
|
||
/* When we try to create a default indirect symbol from the dynamic
|
||
definition with the default version, we skip it if its type and
|
||
the type of existing regular definition mismatch. */
|
||
if (pold_alignment == NULL
|
||
&& newdyn
|
||
&& newdef
|
||
&& !olddyn
|
||
&& (((olddef || h->root.type == bfd_link_hash_common)
|
||
&& ELF_ST_TYPE (sym->st_info) != h->type
|
||
&& ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
|
||
&& h->type != STT_NOTYPE
|
||
&& !(newfunc && oldfunc))
|
||
|| (olddef
|
||
&& ((h->type == STT_GNU_IFUNC)
|
||
!= (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
|
||
{
|
||
*skip = TRUE;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Check TLS symbols. We don't check undefined symbols introduced
|
||
by "ld -u" which have no type (and oldbfd NULL), and we don't
|
||
check symbols from plugins because they also have no type. */
|
||
if (oldbfd != NULL
|
||
&& (oldbfd->flags & BFD_PLUGIN) == 0
|
||
&& (abfd->flags & BFD_PLUGIN) == 0
|
||
&& ELF_ST_TYPE (sym->st_info) != h->type
|
||
&& (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
|
||
{
|
||
bfd *ntbfd, *tbfd;
|
||
bfd_boolean ntdef, tdef;
|
||
asection *ntsec, *tsec;
|
||
|
||
if (h->type == STT_TLS)
|
||
{
|
||
ntbfd = abfd;
|
||
ntsec = sec;
|
||
ntdef = newdef;
|
||
tbfd = oldbfd;
|
||
tsec = oldsec;
|
||
tdef = olddef;
|
||
}
|
||
else
|
||
{
|
||
ntbfd = oldbfd;
|
||
ntsec = oldsec;
|
||
ntdef = olddef;
|
||
tbfd = abfd;
|
||
tsec = sec;
|
||
tdef = newdef;
|
||
}
|
||
|
||
if (tdef && ntdef)
|
||
(*_bfd_error_handler)
|
||
(_("%s: TLS definition in %B section %A "
|
||
"mismatches non-TLS definition in %B section %A"),
|
||
tbfd, tsec, ntbfd, ntsec, h->root.root.string);
|
||
else if (!tdef && !ntdef)
|
||
(*_bfd_error_handler)
|
||
(_("%s: TLS reference in %B "
|
||
"mismatches non-TLS reference in %B"),
|
||
tbfd, ntbfd, h->root.root.string);
|
||
else if (tdef)
|
||
(*_bfd_error_handler)
|
||
(_("%s: TLS definition in %B section %A "
|
||
"mismatches non-TLS reference in %B"),
|
||
tbfd, tsec, ntbfd, h->root.root.string);
|
||
else
|
||
(*_bfd_error_handler)
|
||
(_("%s: TLS reference in %B "
|
||
"mismatches non-TLS definition in %B section %A"),
|
||
tbfd, ntbfd, ntsec, h->root.root.string);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
/* If the old symbol has non-default visibility, we ignore the new
|
||
definition from a dynamic object. */
|
||
if (newdyn
|
||
&& ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
|
||
&& !bfd_is_und_section (sec))
|
||
{
|
||
*skip = TRUE;
|
||
/* Make sure this symbol is dynamic. */
|
||
h->ref_dynamic = 1;
|
||
hi->ref_dynamic = 1;
|
||
/* A protected symbol has external availability. Make sure it is
|
||
recorded as dynamic.
|
||
|
||
FIXME: Should we check type and size for protected symbol? */
|
||
if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
|
||
return bfd_elf_link_record_dynamic_symbol (info, h);
|
||
else
|
||
return TRUE;
|
||
}
|
||
else if (!newdyn
|
||
&& ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
|
||
&& h->def_dynamic)
|
||
{
|
||
/* If the new symbol with non-default visibility comes from a
|
||
relocatable file and the old definition comes from a dynamic
|
||
object, we remove the old definition. */
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
{
|
||
/* Handle the case where the old dynamic definition is
|
||
default versioned. We need to copy the symbol info from
|
||
the symbol with default version to the normal one if it
|
||
was referenced before. */
|
||
if (h->ref_regular)
|
||
{
|
||
hi->root.type = h->root.type;
|
||
h->root.type = bfd_link_hash_indirect;
|
||
(*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
|
||
|
||
h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
|
||
if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
|
||
{
|
||
/* If the new symbol is hidden or internal, completely undo
|
||
any dynamic link state. */
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
h->forced_local = 0;
|
||
h->ref_dynamic = 0;
|
||
}
|
||
else
|
||
h->ref_dynamic = 1;
|
||
|
||
h->def_dynamic = 0;
|
||
/* FIXME: Should we check type and size for protected symbol? */
|
||
h->size = 0;
|
||
h->type = 0;
|
||
|
||
h = hi;
|
||
}
|
||
else
|
||
h = hi;
|
||
}
|
||
|
||
/* If the old symbol was undefined before, then it will still be
|
||
on the undefs list. If the new symbol is undefined or
|
||
common, we can't make it bfd_link_hash_new here, because new
|
||
undefined or common symbols will be added to the undefs list
|
||
by _bfd_generic_link_add_one_symbol. Symbols may not be
|
||
added twice to the undefs list. Also, if the new symbol is
|
||
undefweak then we don't want to lose the strong undef. */
|
||
if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
|
||
{
|
||
h->root.type = bfd_link_hash_undefined;
|
||
h->root.u.undef.abfd = abfd;
|
||
}
|
||
else
|
||
{
|
||
h->root.type = bfd_link_hash_new;
|
||
h->root.u.undef.abfd = NULL;
|
||
}
|
||
|
||
if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
|
||
{
|
||
/* If the new symbol is hidden or internal, completely undo
|
||
any dynamic link state. */
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
h->forced_local = 0;
|
||
h->ref_dynamic = 0;
|
||
}
|
||
else
|
||
h->ref_dynamic = 1;
|
||
h->def_dynamic = 0;
|
||
/* FIXME: Should we check type and size for protected symbol? */
|
||
h->size = 0;
|
||
h->type = 0;
|
||
return TRUE;
|
||
}
|
||
|
||
/* If a new weak symbol definition comes from a regular file and the
|
||
old symbol comes from a dynamic library, we treat the new one as
|
||
strong. Similarly, an old weak symbol definition from a regular
|
||
file is treated as strong when the new symbol comes from a dynamic
|
||
library. Further, an old weak symbol from a dynamic library is
|
||
treated as strong if the new symbol is from a dynamic library.
|
||
This reflects the way glibc's ld.so works.
|
||
|
||
Do this before setting *type_change_ok or *size_change_ok so that
|
||
we warn properly when dynamic library symbols are overridden. */
|
||
|
||
if (newdef && !newdyn && olddyn)
|
||
newweak = FALSE;
|
||
if (olddef && newdyn)
|
||
oldweak = FALSE;
|
||
|
||
/* Allow changes between different types of function symbol. */
|
||
if (newfunc && oldfunc)
|
||
*type_change_ok = TRUE;
|
||
|
||
/* It's OK to change the type if either the existing symbol or the
|
||
new symbol is weak. A type change is also OK if the old symbol
|
||
is undefined and the new symbol is defined. */
|
||
|
||
if (oldweak
|
||
|| newweak
|
||
|| (newdef
|
||
&& h->root.type == bfd_link_hash_undefined))
|
||
*type_change_ok = TRUE;
|
||
|
||
/* It's OK to change the size if either the existing symbol or the
|
||
new symbol is weak, or if the old symbol is undefined. */
|
||
|
||
if (*type_change_ok
|
||
|| h->root.type == bfd_link_hash_undefined)
|
||
*size_change_ok = TRUE;
|
||
|
||
/* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
|
||
symbol, respectively, appears to be a common symbol in a dynamic
|
||
object. If a symbol appears in an uninitialized section, and is
|
||
not weak, and is not a function, then it may be a common symbol
|
||
which was resolved when the dynamic object was created. We want
|
||
to treat such symbols specially, because they raise special
|
||
considerations when setting the symbol size: if the symbol
|
||
appears as a common symbol in a regular object, and the size in
|
||
the regular object is larger, we must make sure that we use the
|
||
larger size. This problematic case can always be avoided in C,
|
||
but it must be handled correctly when using Fortran shared
|
||
libraries.
|
||
|
||
Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
|
||
likewise for OLDDYNCOMMON and OLDDEF.
|
||
|
||
Note that this test is just a heuristic, and that it is quite
|
||
possible to have an uninitialized symbol in a shared object which
|
||
is really a definition, rather than a common symbol. This could
|
||
lead to some minor confusion when the symbol really is a common
|
||
symbol in some regular object. However, I think it will be
|
||
harmless. */
|
||
|
||
if (newdyn
|
||
&& newdef
|
||
&& !newweak
|
||
&& (sec->flags & SEC_ALLOC) != 0
|
||
&& (sec->flags & SEC_LOAD) == 0
|
||
&& sym->st_size > 0
|
||
&& !newfunc)
|
||
newdyncommon = TRUE;
|
||
else
|
||
newdyncommon = FALSE;
|
||
|
||
if (olddyn
|
||
&& olddef
|
||
&& h->root.type == bfd_link_hash_defined
|
||
&& h->def_dynamic
|
||
&& (h->root.u.def.section->flags & SEC_ALLOC) != 0
|
||
&& (h->root.u.def.section->flags & SEC_LOAD) == 0
|
||
&& h->size > 0
|
||
&& !oldfunc)
|
||
olddyncommon = TRUE;
|
||
else
|
||
olddyncommon = FALSE;
|
||
|
||
/* We now know everything about the old and new symbols. We ask the
|
||
backend to check if we can merge them. */
|
||
if (bed->merge_symbol != NULL)
|
||
{
|
||
if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
|
||
return FALSE;
|
||
sec = *psec;
|
||
}
|
||
|
||
/* If both the old and the new symbols look like common symbols in a
|
||
dynamic object, set the size of the symbol to the larger of the
|
||
two. */
|
||
|
||
if (olddyncommon
|
||
&& newdyncommon
|
||
&& sym->st_size != h->size)
|
||
{
|
||
/* Since we think we have two common symbols, issue a multiple
|
||
common warning if desired. Note that we only warn if the
|
||
size is different. If the size is the same, we simply let
|
||
the old symbol override the new one as normally happens with
|
||
symbols defined in dynamic objects. */
|
||
|
||
if (! ((*info->callbacks->multiple_common)
|
||
(info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
|
||
return FALSE;
|
||
|
||
if (sym->st_size > h->size)
|
||
h->size = sym->st_size;
|
||
|
||
*size_change_ok = TRUE;
|
||
}
|
||
|
||
/* If we are looking at a dynamic object, and we have found a
|
||
definition, we need to see if the symbol was already defined by
|
||
some other object. If so, we want to use the existing
|
||
definition, and we do not want to report a multiple symbol
|
||
definition error; we do this by clobbering *PSEC to be
|
||
bfd_und_section_ptr.
|
||
|
||
We treat a common symbol as a definition if the symbol in the
|
||
shared library is a function, since common symbols always
|
||
represent variables; this can cause confusion in principle, but
|
||
any such confusion would seem to indicate an erroneous program or
|
||
shared library. We also permit a common symbol in a regular
|
||
object to override a weak symbol in a shared object. */
|
||
|
||
if (newdyn
|
||
&& newdef
|
||
&& (olddef
|
||
|| (h->root.type == bfd_link_hash_common
|
||
&& (newweak || newfunc))))
|
||
{
|
||
*override = TRUE;
|
||
newdef = FALSE;
|
||
newdyncommon = FALSE;
|
||
|
||
*psec = sec = bfd_und_section_ptr;
|
||
*size_change_ok = TRUE;
|
||
|
||
/* If we get here when the old symbol is a common symbol, then
|
||
we are explicitly letting it override a weak symbol or
|
||
function in a dynamic object, and we don't want to warn about
|
||
a type change. If the old symbol is a defined symbol, a type
|
||
change warning may still be appropriate. */
|
||
|
||
if (h->root.type == bfd_link_hash_common)
|
||
*type_change_ok = TRUE;
|
||
}
|
||
|
||
/* Handle the special case of an old common symbol merging with a
|
||
new symbol which looks like a common symbol in a shared object.
|
||
We change *PSEC and *PVALUE to make the new symbol look like a
|
||
common symbol, and let _bfd_generic_link_add_one_symbol do the
|
||
right thing. */
|
||
|
||
if (newdyncommon
|
||
&& h->root.type == bfd_link_hash_common)
|
||
{
|
||
*override = TRUE;
|
||
newdef = FALSE;
|
||
newdyncommon = FALSE;
|
||
*pvalue = sym->st_size;
|
||
*psec = sec = bed->common_section (oldsec);
|
||
*size_change_ok = TRUE;
|
||
}
|
||
|
||
/* Skip weak definitions of symbols that are already defined. */
|
||
if (newdef && olddef && newweak)
|
||
{
|
||
/* Don't skip new non-IR weak syms. */
|
||
if (!(oldbfd != NULL
|
||
&& (oldbfd->flags & BFD_PLUGIN) != 0
|
||
&& (abfd->flags & BFD_PLUGIN) == 0))
|
||
{
|
||
newdef = FALSE;
|
||
*skip = TRUE;
|
||
}
|
||
|
||
/* Merge st_other. If the symbol already has a dynamic index,
|
||
but visibility says it should not be visible, turn it into a
|
||
local symbol. */
|
||
elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
|
||
if (h->dynindx != -1)
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_INTERNAL:
|
||
case STV_HIDDEN:
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If the old symbol is from a dynamic object, and the new symbol is
|
||
a definition which is not from a dynamic object, then the new
|
||
symbol overrides the old symbol. Symbols from regular files
|
||
always take precedence over symbols from dynamic objects, even if
|
||
they are defined after the dynamic object in the link.
|
||
|
||
As above, we again permit a common symbol in a regular object to
|
||
override a definition in a shared object if the shared object
|
||
symbol is a function or is weak. */
|
||
|
||
flip = NULL;
|
||
if (!newdyn
|
||
&& (newdef
|
||
|| (bfd_is_com_section (sec)
|
||
&& (oldweak || oldfunc)))
|
||
&& olddyn
|
||
&& olddef
|
||
&& h->def_dynamic)
|
||
{
|
||
/* Change the hash table entry to undefined, and let
|
||
_bfd_generic_link_add_one_symbol do the right thing with the
|
||
new definition. */
|
||
|
||
h->root.type = bfd_link_hash_undefined;
|
||
h->root.u.undef.abfd = h->root.u.def.section->owner;
|
||
*size_change_ok = TRUE;
|
||
|
||
olddef = FALSE;
|
||
olddyncommon = FALSE;
|
||
|
||
/* We again permit a type change when a common symbol may be
|
||
overriding a function. */
|
||
|
||
if (bfd_is_com_section (sec))
|
||
{
|
||
if (oldfunc)
|
||
{
|
||
/* If a common symbol overrides a function, make sure
|
||
that it isn't defined dynamically nor has type
|
||
function. */
|
||
h->def_dynamic = 0;
|
||
h->type = STT_NOTYPE;
|
||
}
|
||
*type_change_ok = TRUE;
|
||
}
|
||
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
flip = hi;
|
||
else
|
||
/* This union may have been set to be non-NULL when this symbol
|
||
was seen in a dynamic object. We must force the union to be
|
||
NULL, so that it is correct for a regular symbol. */
|
||
h->verinfo.vertree = NULL;
|
||
}
|
||
|
||
/* Handle the special case of a new common symbol merging with an
|
||
old symbol that looks like it might be a common symbol defined in
|
||
a shared object. Note that we have already handled the case in
|
||
which a new common symbol should simply override the definition
|
||
in the shared library. */
|
||
|
||
if (! newdyn
|
||
&& bfd_is_com_section (sec)
|
||
&& olddyncommon)
|
||
{
|
||
/* It would be best if we could set the hash table entry to a
|
||
common symbol, but we don't know what to use for the section
|
||
or the alignment. */
|
||
if (! ((*info->callbacks->multiple_common)
|
||
(info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
|
||
return FALSE;
|
||
|
||
/* If the presumed common symbol in the dynamic object is
|
||
larger, pretend that the new symbol has its size. */
|
||
|
||
if (h->size > *pvalue)
|
||
*pvalue = h->size;
|
||
|
||
/* We need to remember the alignment required by the symbol
|
||
in the dynamic object. */
|
||
BFD_ASSERT (pold_alignment);
|
||
*pold_alignment = h->root.u.def.section->alignment_power;
|
||
|
||
olddef = FALSE;
|
||
olddyncommon = FALSE;
|
||
|
||
h->root.type = bfd_link_hash_undefined;
|
||
h->root.u.undef.abfd = h->root.u.def.section->owner;
|
||
|
||
*size_change_ok = TRUE;
|
||
*type_change_ok = TRUE;
|
||
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
flip = hi;
|
||
else
|
||
h->verinfo.vertree = NULL;
|
||
}
|
||
|
||
if (flip != NULL)
|
||
{
|
||
/* Handle the case where we had a versioned symbol in a dynamic
|
||
library and now find a definition in a normal object. In this
|
||
case, we make the versioned symbol point to the normal one. */
|
||
flip->root.type = h->root.type;
|
||
flip->root.u.undef.abfd = h->root.u.undef.abfd;
|
||
h->root.type = bfd_link_hash_indirect;
|
||
h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
|
||
(*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
|
||
if (h->def_dynamic)
|
||
{
|
||
h->def_dynamic = 0;
|
||
flip->ref_dynamic = 1;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* This function is called to create an indirect symbol from the
|
||
default for the symbol with the default version if needed. The
|
||
symbol is described by H, NAME, SYM, SEC, and VALUE. We
|
||
set DYNSYM if the new indirect symbol is dynamic. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_add_default_symbol (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h,
|
||
const char *name,
|
||
Elf_Internal_Sym *sym,
|
||
asection *sec,
|
||
bfd_vma value,
|
||
bfd **poldbfd,
|
||
bfd_boolean *dynsym)
|
||
{
|
||
bfd_boolean type_change_ok;
|
||
bfd_boolean size_change_ok;
|
||
bfd_boolean skip;
|
||
char *shortname;
|
||
struct elf_link_hash_entry *hi;
|
||
struct bfd_link_hash_entry *bh;
|
||
const struct elf_backend_data *bed;
|
||
bfd_boolean collect;
|
||
bfd_boolean dynamic;
|
||
bfd_boolean override;
|
||
char *p;
|
||
size_t len, shortlen;
|
||
asection *tmp_sec;
|
||
|
||
/* If this symbol has a version, and it is the default version, we
|
||
create an indirect symbol from the default name to the fully
|
||
decorated name. This will cause external references which do not
|
||
specify a version to be bound to this version of the symbol. */
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p == NULL || p[1] != ELF_VER_CHR)
|
||
return TRUE;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
collect = bed->collect;
|
||
dynamic = (abfd->flags & DYNAMIC) != 0;
|
||
|
||
shortlen = p - name;
|
||
shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
|
||
if (shortname == NULL)
|
||
return FALSE;
|
||
memcpy (shortname, name, shortlen);
|
||
shortname[shortlen] = '\0';
|
||
|
||
/* We are going to create a new symbol. Merge it with any existing
|
||
symbol with this name. For the purposes of the merge, act as
|
||
though we were defining the symbol we just defined, although we
|
||
actually going to define an indirect symbol. */
|
||
type_change_ok = FALSE;
|
||
size_change_ok = FALSE;
|
||
tmp_sec = sec;
|
||
if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
|
||
&hi, poldbfd, NULL, NULL, &skip, &override,
|
||
&type_change_ok, &size_change_ok))
|
||
return FALSE;
|
||
|
||
if (skip)
|
||
goto nondefault;
|
||
|
||
if (! override)
|
||
{
|
||
bh = &hi->root;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
|
||
0, name, FALSE, collect, &bh)))
|
||
return FALSE;
|
||
hi = (struct elf_link_hash_entry *) bh;
|
||
}
|
||
else
|
||
{
|
||
/* In this case the symbol named SHORTNAME is overriding the
|
||
indirect symbol we want to add. We were planning on making
|
||
SHORTNAME an indirect symbol referring to NAME. SHORTNAME
|
||
is the name without a version. NAME is the fully versioned
|
||
name, and it is the default version.
|
||
|
||
Overriding means that we already saw a definition for the
|
||
symbol SHORTNAME in a regular object, and it is overriding
|
||
the symbol defined in the dynamic object.
|
||
|
||
When this happens, we actually want to change NAME, the
|
||
symbol we just added, to refer to SHORTNAME. This will cause
|
||
references to NAME in the shared object to become references
|
||
to SHORTNAME in the regular object. This is what we expect
|
||
when we override a function in a shared object: that the
|
||
references in the shared object will be mapped to the
|
||
definition in the regular object. */
|
||
|
||
while (hi->root.type == bfd_link_hash_indirect
|
||
|| hi->root.type == bfd_link_hash_warning)
|
||
hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
|
||
|
||
h->root.type = bfd_link_hash_indirect;
|
||
h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
|
||
if (h->def_dynamic)
|
||
{
|
||
h->def_dynamic = 0;
|
||
hi->ref_dynamic = 1;
|
||
if (hi->ref_regular
|
||
|| hi->def_regular)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, hi))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* Now set HI to H, so that the following code will set the
|
||
other fields correctly. */
|
||
hi = h;
|
||
}
|
||
|
||
/* Check if HI is a warning symbol. */
|
||
if (hi->root.type == bfd_link_hash_warning)
|
||
hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
|
||
|
||
/* If there is a duplicate definition somewhere, then HI may not
|
||
point to an indirect symbol. We will have reported an error to
|
||
the user in that case. */
|
||
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
{
|
||
struct elf_link_hash_entry *ht;
|
||
|
||
ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
|
||
(*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
|
||
|
||
/* A reference to the SHORTNAME symbol from a dynamic library
|
||
will be satisfied by the versioned symbol at runtime. In
|
||
effect, we have a reference to the versioned symbol. */
|
||
ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
|
||
hi->dynamic_def |= ht->dynamic_def;
|
||
|
||
/* See if the new flags lead us to realize that the symbol must
|
||
be dynamic. */
|
||
if (! *dynsym)
|
||
{
|
||
if (! dynamic)
|
||
{
|
||
if (! info->executable
|
||
|| hi->def_dynamic
|
||
|| hi->ref_dynamic)
|
||
*dynsym = TRUE;
|
||
}
|
||
else
|
||
{
|
||
if (hi->ref_regular)
|
||
*dynsym = TRUE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We also need to define an indirection from the nondefault version
|
||
of the symbol. */
|
||
|
||
nondefault:
|
||
len = strlen (name);
|
||
shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
|
||
if (shortname == NULL)
|
||
return FALSE;
|
||
memcpy (shortname, name, shortlen);
|
||
memcpy (shortname + shortlen, p + 1, len - shortlen);
|
||
|
||
/* Once again, merge with any existing symbol. */
|
||
type_change_ok = FALSE;
|
||
size_change_ok = FALSE;
|
||
tmp_sec = sec;
|
||
if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
|
||
&hi, poldbfd, NULL, NULL, &skip, &override,
|
||
&type_change_ok, &size_change_ok))
|
||
return FALSE;
|
||
|
||
if (skip)
|
||
return TRUE;
|
||
|
||
if (override)
|
||
{
|
||
/* Here SHORTNAME is a versioned name, so we don't expect to see
|
||
the type of override we do in the case above unless it is
|
||
overridden by a versioned definition. */
|
||
if (hi->root.type != bfd_link_hash_defined
|
||
&& hi->root.type != bfd_link_hash_defweak)
|
||
(*_bfd_error_handler)
|
||
(_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
|
||
abfd, shortname);
|
||
}
|
||
else
|
||
{
|
||
bh = &hi->root;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, shortname, BSF_INDIRECT,
|
||
bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
|
||
return FALSE;
|
||
hi = (struct elf_link_hash_entry *) bh;
|
||
|
||
/* If there is a duplicate definition somewhere, then HI may not
|
||
point to an indirect symbol. We will have reported an error
|
||
to the user in that case. */
|
||
|
||
if (hi->root.type == bfd_link_hash_indirect)
|
||
{
|
||
(*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
|
||
h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
|
||
hi->dynamic_def |= h->dynamic_def;
|
||
|
||
/* See if the new flags lead us to realize that the symbol
|
||
must be dynamic. */
|
||
if (! *dynsym)
|
||
{
|
||
if (! dynamic)
|
||
{
|
||
if (! info->executable
|
||
|| hi->ref_dynamic)
|
||
*dynsym = TRUE;
|
||
}
|
||
else
|
||
{
|
||
if (hi->ref_regular)
|
||
*dynsym = TRUE;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* This routine is used to export all defined symbols into the dynamic
|
||
symbol table. It is called via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_info_failed *eif = (struct elf_info_failed *) data;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return TRUE;
|
||
|
||
/* Ignore this if we won't export it. */
|
||
if (!eif->info->export_dynamic && !h->dynamic)
|
||
return TRUE;
|
||
|
||
if (h->dynindx == -1
|
||
&& (h->def_regular || h->ref_regular)
|
||
&& ! bfd_hide_sym_by_version (eif->info->version_info,
|
||
h->root.root.string))
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
|
||
{
|
||
eif->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Look through the symbols which are defined in other shared
|
||
libraries and referenced here. Update the list of version
|
||
dependencies. This will be put into the .gnu.version_r section.
|
||
This function is called via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
|
||
void *data)
|
||
{
|
||
struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
|
||
Elf_Internal_Verneed *t;
|
||
Elf_Internal_Vernaux *a;
|
||
bfd_size_type amt;
|
||
|
||
/* We only care about symbols defined in shared objects with version
|
||
information. */
|
||
if (!h->def_dynamic
|
||
|| h->def_regular
|
||
|| h->dynindx == -1
|
||
|| h->verinfo.verdef == NULL
|
||
|| (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
|
||
& (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
|
||
return TRUE;
|
||
|
||
/* See if we already know about this version. */
|
||
for (t = elf_tdata (rinfo->info->output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
|
||
continue;
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
|
||
return TRUE;
|
||
|
||
break;
|
||
}
|
||
|
||
/* This is a new version. Add it to tree we are building. */
|
||
|
||
if (t == NULL)
|
||
{
|
||
amt = sizeof *t;
|
||
t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
|
||
if (t == NULL)
|
||
{
|
||
rinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
t->vn_bfd = h->verinfo.verdef->vd_bfd;
|
||
t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
|
||
elf_tdata (rinfo->info->output_bfd)->verref = t;
|
||
}
|
||
|
||
amt = sizeof *a;
|
||
a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
|
||
if (a == NULL)
|
||
{
|
||
rinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* Note that we are copying a string pointer here, and testing it
|
||
above. If bfd_elf_string_from_elf_section is ever changed to
|
||
discard the string data when low in memory, this will have to be
|
||
fixed. */
|
||
a->vna_nodename = h->verinfo.verdef->vd_nodename;
|
||
|
||
a->vna_flags = h->verinfo.verdef->vd_flags;
|
||
a->vna_nextptr = t->vn_auxptr;
|
||
|
||
h->verinfo.verdef->vd_exp_refno = rinfo->vers;
|
||
++rinfo->vers;
|
||
|
||
a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
|
||
|
||
t->vn_auxptr = a;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Figure out appropriate versions for all the symbols. We may not
|
||
have the version number script until we have read all of the input
|
||
files, so until that point we don't know which symbols should be
|
||
local. This function is called via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_info_failed *sinfo;
|
||
struct bfd_link_info *info;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_info_failed eif;
|
||
char *p;
|
||
bfd_size_type amt;
|
||
|
||
sinfo = (struct elf_info_failed *) data;
|
||
info = sinfo->info;
|
||
|
||
/* Fix the symbol flags. */
|
||
eif.failed = FALSE;
|
||
eif.info = info;
|
||
if (! _bfd_elf_fix_symbol_flags (h, &eif))
|
||
{
|
||
if (eif.failed)
|
||
sinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* We only need version numbers for symbols defined in regular
|
||
objects. */
|
||
if (!h->def_regular)
|
||
return TRUE;
|
||
|
||
bed = get_elf_backend_data (info->output_bfd);
|
||
p = strchr (h->root.root.string, ELF_VER_CHR);
|
||
if (p != NULL && h->verinfo.vertree == NULL)
|
||
{
|
||
struct bfd_elf_version_tree *t;
|
||
bfd_boolean hidden;
|
||
|
||
hidden = TRUE;
|
||
|
||
/* There are two consecutive ELF_VER_CHR characters if this is
|
||
not a hidden symbol. */
|
||
++p;
|
||
if (*p == ELF_VER_CHR)
|
||
{
|
||
hidden = FALSE;
|
||
++p;
|
||
}
|
||
|
||
/* If there is no version string, we can just return out. */
|
||
if (*p == '\0')
|
||
{
|
||
if (hidden)
|
||
h->hidden = 1;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Look for the version. If we find it, it is no longer weak. */
|
||
for (t = sinfo->info->version_info; t != NULL; t = t->next)
|
||
{
|
||
if (strcmp (t->name, p) == 0)
|
||
{
|
||
size_t len;
|
||
char *alc;
|
||
struct bfd_elf_version_expr *d;
|
||
|
||
len = p - h->root.root.string;
|
||
alc = (char *) bfd_malloc (len);
|
||
if (alc == NULL)
|
||
{
|
||
sinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
memcpy (alc, h->root.root.string, len - 1);
|
||
alc[len - 1] = '\0';
|
||
if (alc[len - 2] == ELF_VER_CHR)
|
||
alc[len - 2] = '\0';
|
||
|
||
h->verinfo.vertree = t;
|
||
t->used = TRUE;
|
||
d = NULL;
|
||
|
||
if (t->globals.list != NULL)
|
||
d = (*t->match) (&t->globals, NULL, alc);
|
||
|
||
/* See if there is anything to force this symbol to
|
||
local scope. */
|
||
if (d == NULL && t->locals.list != NULL)
|
||
{
|
||
d = (*t->match) (&t->locals, NULL, alc);
|
||
if (d != NULL
|
||
&& h->dynindx != -1
|
||
&& ! info->export_dynamic)
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
}
|
||
|
||
free (alc);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* If we are building an application, we need to create a
|
||
version node for this version. */
|
||
if (t == NULL && info->executable)
|
||
{
|
||
struct bfd_elf_version_tree **pp;
|
||
int version_index;
|
||
|
||
/* If we aren't going to export this symbol, we don't need
|
||
to worry about it. */
|
||
if (h->dynindx == -1)
|
||
return TRUE;
|
||
|
||
amt = sizeof *t;
|
||
t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
|
||
if (t == NULL)
|
||
{
|
||
sinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
t->name = p;
|
||
t->name_indx = (unsigned int) -1;
|
||
t->used = TRUE;
|
||
|
||
version_index = 1;
|
||
/* Don't count anonymous version tag. */
|
||
if (sinfo->info->version_info != NULL
|
||
&& sinfo->info->version_info->vernum == 0)
|
||
version_index = 0;
|
||
for (pp = &sinfo->info->version_info;
|
||
*pp != NULL;
|
||
pp = &(*pp)->next)
|
||
++version_index;
|
||
t->vernum = version_index;
|
||
|
||
*pp = t;
|
||
|
||
h->verinfo.vertree = t;
|
||
}
|
||
else if (t == NULL)
|
||
{
|
||
/* We could not find the version for a symbol when
|
||
generating a shared archive. Return an error. */
|
||
(*_bfd_error_handler)
|
||
(_("%B: version node not found for symbol %s"),
|
||
info->output_bfd, h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
sinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
if (hidden)
|
||
h->hidden = 1;
|
||
}
|
||
|
||
/* If we don't have a version for this symbol, see if we can find
|
||
something. */
|
||
if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
|
||
{
|
||
bfd_boolean hide;
|
||
|
||
h->verinfo.vertree
|
||
= bfd_find_version_for_sym (sinfo->info->version_info,
|
||
h->root.root.string, &hide);
|
||
if (h->verinfo.vertree != NULL && hide)
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Read and swap the relocs from the section indicated by SHDR. This
|
||
may be either a REL or a RELA section. The relocations are
|
||
translated into RELA relocations and stored in INTERNAL_RELOCS,
|
||
which should have already been allocated to contain enough space.
|
||
The EXTERNAL_RELOCS are a buffer where the external form of the
|
||
relocations should be stored.
|
||
|
||
Returns FALSE if something goes wrong. */
|
||
|
||
static bfd_boolean
|
||
elf_link_read_relocs_from_section (bfd *abfd,
|
||
asection *sec,
|
||
Elf_Internal_Shdr *shdr,
|
||
void *external_relocs,
|
||
Elf_Internal_Rela *internal_relocs)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
|
||
const bfd_byte *erela;
|
||
const bfd_byte *erelaend;
|
||
Elf_Internal_Rela *irela;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
size_t nsyms;
|
||
|
||
/* Position ourselves at the start of the section. */
|
||
if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
|
||
return FALSE;
|
||
|
||
/* Read the relocations. */
|
||
if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
|
||
return FALSE;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
/* Convert the external relocations to the internal format. */
|
||
if (shdr->sh_entsize == bed->s->sizeof_rel)
|
||
swap_in = bed->s->swap_reloc_in;
|
||
else if (shdr->sh_entsize == bed->s->sizeof_rela)
|
||
swap_in = bed->s->swap_reloca_in;
|
||
else
|
||
{
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return FALSE;
|
||
}
|
||
|
||
erela = (const bfd_byte *) external_relocs;
|
||
erelaend = erela + shdr->sh_size;
|
||
irela = internal_relocs;
|
||
while (erela < erelaend)
|
||
{
|
||
bfd_vma r_symndx;
|
||
|
||
(*swap_in) (abfd, erela, irela);
|
||
r_symndx = ELF32_R_SYM (irela->r_info);
|
||
if (bed->s->arch_size == 64)
|
||
r_symndx >>= 24;
|
||
if (nsyms > 0)
|
||
{
|
||
if ((size_t) r_symndx >= nsyms)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
|
||
" for offset 0x%lx in section `%A'"),
|
||
abfd, sec,
|
||
(unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
}
|
||
else if (r_symndx != STN_UNDEF)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
|
||
" when the object file has no symbol table"),
|
||
abfd, sec,
|
||
(unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
irela += bed->s->int_rels_per_ext_rel;
|
||
erela += shdr->sh_entsize;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Read and swap the relocs for a section O. They may have been
|
||
cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
|
||
not NULL, they are used as buffers to read into. They are known to
|
||
be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
|
||
the return value is allocated using either malloc or bfd_alloc,
|
||
according to the KEEP_MEMORY argument. If O has two relocation
|
||
sections (both REL and RELA relocations), then the REL_HDR
|
||
relocations will appear first in INTERNAL_RELOCS, followed by the
|
||
RELA_HDR relocations. */
|
||
|
||
Elf_Internal_Rela *
|
||
_bfd_elf_link_read_relocs (bfd *abfd,
|
||
asection *o,
|
||
void *external_relocs,
|
||
Elf_Internal_Rela *internal_relocs,
|
||
bfd_boolean keep_memory)
|
||
{
|
||
void *alloc1 = NULL;
|
||
Elf_Internal_Rela *alloc2 = NULL;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct bfd_elf_section_data *esdo = elf_section_data (o);
|
||
Elf_Internal_Rela *internal_rela_relocs;
|
||
|
||
if (esdo->relocs != NULL)
|
||
return esdo->relocs;
|
||
|
||
if (o->reloc_count == 0)
|
||
return NULL;
|
||
|
||
if (internal_relocs == NULL)
|
||
{
|
||
bfd_size_type size;
|
||
|
||
size = o->reloc_count;
|
||
size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
|
||
if (keep_memory)
|
||
internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
|
||
else
|
||
internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (external_relocs == NULL)
|
||
{
|
||
bfd_size_type size = 0;
|
||
|
||
if (esdo->rel.hdr)
|
||
size += esdo->rel.hdr->sh_size;
|
||
if (esdo->rela.hdr)
|
||
size += esdo->rela.hdr->sh_size;
|
||
|
||
alloc1 = bfd_malloc (size);
|
||
if (alloc1 == NULL)
|
||
goto error_return;
|
||
external_relocs = alloc1;
|
||
}
|
||
|
||
internal_rela_relocs = internal_relocs;
|
||
if (esdo->rel.hdr)
|
||
{
|
||
if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
|
||
external_relocs,
|
||
internal_relocs))
|
||
goto error_return;
|
||
external_relocs = (((bfd_byte *) external_relocs)
|
||
+ esdo->rel.hdr->sh_size);
|
||
internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
|
||
* bed->s->int_rels_per_ext_rel);
|
||
}
|
||
|
||
if (esdo->rela.hdr
|
||
&& (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
|
||
external_relocs,
|
||
internal_rela_relocs)))
|
||
goto error_return;
|
||
|
||
/* Cache the results for next time, if we can. */
|
||
if (keep_memory)
|
||
esdo->relocs = internal_relocs;
|
||
|
||
if (alloc1 != NULL)
|
||
free (alloc1);
|
||
|
||
/* Don't free alloc2, since if it was allocated we are passing it
|
||
back (under the name of internal_relocs). */
|
||
|
||
return internal_relocs;
|
||
|
||
error_return:
|
||
if (alloc1 != NULL)
|
||
free (alloc1);
|
||
if (alloc2 != NULL)
|
||
{
|
||
if (keep_memory)
|
||
bfd_release (abfd, alloc2);
|
||
else
|
||
free (alloc2);
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
/* Compute the size of, and allocate space for, REL_HDR which is the
|
||
section header for a section containing relocations for O. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_link_size_reloc_section (bfd *abfd,
|
||
struct bfd_elf_section_reloc_data *reldata)
|
||
{
|
||
Elf_Internal_Shdr *rel_hdr = reldata->hdr;
|
||
|
||
/* That allows us to calculate the size of the section. */
|
||
rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
|
||
|
||
/* The contents field must last into write_object_contents, so we
|
||
allocate it with bfd_alloc rather than malloc. Also since we
|
||
cannot be sure that the contents will actually be filled in,
|
||
we zero the allocated space. */
|
||
rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
|
||
if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
|
||
return FALSE;
|
||
|
||
if (reldata->hashes == NULL && reldata->count)
|
||
{
|
||
struct elf_link_hash_entry **p;
|
||
|
||
p = ((struct elf_link_hash_entry **)
|
||
bfd_zmalloc (reldata->count * sizeof (*p)));
|
||
if (p == NULL)
|
||
return FALSE;
|
||
|
||
reldata->hashes = p;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Copy the relocations indicated by the INTERNAL_RELOCS (which
|
||
originated from the section given by INPUT_REL_HDR) to the
|
||
OUTPUT_BFD. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_link_output_relocs (bfd *output_bfd,
|
||
asection *input_section,
|
||
Elf_Internal_Shdr *input_rel_hdr,
|
||
Elf_Internal_Rela *internal_relocs,
|
||
struct elf_link_hash_entry **rel_hash
|
||
ATTRIBUTE_UNUSED)
|
||
{
|
||
Elf_Internal_Rela *irela;
|
||
Elf_Internal_Rela *irelaend;
|
||
bfd_byte *erel;
|
||
struct bfd_elf_section_reloc_data *output_reldata;
|
||
asection *output_section;
|
||
const struct elf_backend_data *bed;
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
struct bfd_elf_section_data *esdo;
|
||
|
||
output_section = input_section->output_section;
|
||
|
||
bed = get_elf_backend_data (output_bfd);
|
||
esdo = elf_section_data (output_section);
|
||
if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
|
||
{
|
||
output_reldata = &esdo->rel;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
else if (esdo->rela.hdr
|
||
&& esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
|
||
{
|
||
output_reldata = &esdo->rela;
|
||
swap_out = bed->s->swap_reloca_out;
|
||
}
|
||
else
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: relocation size mismatch in %B section %A"),
|
||
output_bfd, input_section->owner, input_section);
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return FALSE;
|
||
}
|
||
|
||
erel = output_reldata->hdr->contents;
|
||
erel += output_reldata->count * input_rel_hdr->sh_entsize;
|
||
irela = internal_relocs;
|
||
irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
|
||
* bed->s->int_rels_per_ext_rel);
|
||
while (irela < irelaend)
|
||
{
|
||
(*swap_out) (output_bfd, irela, erel);
|
||
irela += bed->s->int_rels_per_ext_rel;
|
||
erel += input_rel_hdr->sh_entsize;
|
||
}
|
||
|
||
/* Bump the counter, so that we know where to add the next set of
|
||
relocations. */
|
||
output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Make weak undefined symbols in PIE dynamic. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
if (info->pie
|
||
&& h->dynindx == -1
|
||
&& h->root.type == bfd_link_hash_undefweak)
|
||
return bfd_elf_link_record_dynamic_symbol (info, h);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Fix up the flags for a symbol. This handles various cases which
|
||
can only be fixed after all the input files are seen. This is
|
||
currently called by both adjust_dynamic_symbol and
|
||
assign_sym_version, which is unnecessary but perhaps more robust in
|
||
the face of future changes. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
|
||
struct elf_info_failed *eif)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
/* If this symbol was mentioned in a non-ELF file, try to set
|
||
DEF_REGULAR and REF_REGULAR correctly. This is the only way to
|
||
permit a non-ELF file to correctly refer to a symbol defined in
|
||
an ELF dynamic object. */
|
||
if (h->non_elf)
|
||
{
|
||
while (h->root.type == bfd_link_hash_indirect)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
{
|
||
h->ref_regular = 1;
|
||
h->ref_regular_nonweak = 1;
|
||
}
|
||
else
|
||
{
|
||
if (h->root.u.def.section->owner != NULL
|
||
&& (bfd_get_flavour (h->root.u.def.section->owner)
|
||
== bfd_target_elf_flavour))
|
||
{
|
||
h->ref_regular = 1;
|
||
h->ref_regular_nonweak = 1;
|
||
}
|
||
else
|
||
h->def_regular = 1;
|
||
}
|
||
|
||
if (h->dynindx == -1
|
||
&& (h->def_dynamic
|
||
|| h->ref_dynamic))
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
|
||
{
|
||
eif->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Unfortunately, NON_ELF is only correct if the symbol
|
||
was first seen in a non-ELF file. Fortunately, if the symbol
|
||
was first seen in an ELF file, we're probably OK unless the
|
||
symbol was defined in a non-ELF file. Catch that case here.
|
||
FIXME: We're still in trouble if the symbol was first seen in
|
||
a dynamic object, and then later in a non-ELF regular object. */
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& !h->def_regular
|
||
&& (h->root.u.def.section->owner != NULL
|
||
? (bfd_get_flavour (h->root.u.def.section->owner)
|
||
!= bfd_target_elf_flavour)
|
||
: (bfd_is_abs_section (h->root.u.def.section)
|
||
&& !h->def_dynamic)))
|
||
h->def_regular = 1;
|
||
}
|
||
|
||
/* Backend specific symbol fixup. */
|
||
bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
|
||
if (bed->elf_backend_fixup_symbol
|
||
&& !(*bed->elf_backend_fixup_symbol) (eif->info, h))
|
||
return FALSE;
|
||
|
||
/* If this is a final link, and the symbol was defined as a common
|
||
symbol in a regular object file, and there was no definition in
|
||
any dynamic object, then the linker will have allocated space for
|
||
the symbol in a common section but the DEF_REGULAR
|
||
flag will not have been set. */
|
||
if (h->root.type == bfd_link_hash_defined
|
||
&& !h->def_regular
|
||
&& h->ref_regular
|
||
&& !h->def_dynamic
|
||
&& (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
|
||
h->def_regular = 1;
|
||
|
||
/* If -Bsymbolic was used (which means to bind references to global
|
||
symbols to the definition within the shared object), and this
|
||
symbol was defined in a regular object, then it actually doesn't
|
||
need a PLT entry. Likewise, if the symbol has non-default
|
||
visibility. If the symbol has hidden or internal visibility, we
|
||
will force it local. */
|
||
if (h->needs_plt
|
||
&& eif->info->shared
|
||
&& is_elf_hash_table (eif->info->hash)
|
||
&& (SYMBOLIC_BIND (eif->info, h)
|
||
|| ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
|
||
&& h->def_regular)
|
||
{
|
||
bfd_boolean force_local;
|
||
|
||
force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
|
||
|| ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
|
||
(*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
|
||
}
|
||
|
||
/* If a weak undefined symbol has non-default visibility, we also
|
||
hide it from the dynamic linker. */
|
||
if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
|
||
&& h->root.type == bfd_link_hash_undefweak)
|
||
(*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
|
||
|
||
/* If this is a weak defined symbol in a dynamic object, and we know
|
||
the real definition in the dynamic object, copy interesting flags
|
||
over to the real definition. */
|
||
if (h->u.weakdef != NULL)
|
||
{
|
||
/* If the real definition is defined by a regular object file,
|
||
don't do anything special. See the longer description in
|
||
_bfd_elf_adjust_dynamic_symbol, below. */
|
||
if (h->u.weakdef->def_regular)
|
||
h->u.weakdef = NULL;
|
||
else
|
||
{
|
||
struct elf_link_hash_entry *weakdef = h->u.weakdef;
|
||
|
||
while (h->root.type == bfd_link_hash_indirect)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak);
|
||
BFD_ASSERT (weakdef->def_dynamic);
|
||
BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
|
||
|| weakdef->root.type == bfd_link_hash_defweak);
|
||
(*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Make the backend pick a good value for a dynamic symbol. This is
|
||
called via elf_link_hash_traverse, and also calls itself
|
||
recursively. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_info_failed *eif = (struct elf_info_failed *) data;
|
||
bfd *dynobj;
|
||
const struct elf_backend_data *bed;
|
||
|
||
if (! is_elf_hash_table (eif->info->hash))
|
||
return FALSE;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return TRUE;
|
||
|
||
/* Fix the symbol flags. */
|
||
if (! _bfd_elf_fix_symbol_flags (h, eif))
|
||
return FALSE;
|
||
|
||
/* If this symbol does not require a PLT entry, and it is not
|
||
defined by a dynamic object, or is not referenced by a regular
|
||
object, ignore it. We do have to handle a weak defined symbol,
|
||
even if no regular object refers to it, if we decided to add it
|
||
to the dynamic symbol table. FIXME: Do we normally need to worry
|
||
about symbols which are defined by one dynamic object and
|
||
referenced by another one? */
|
||
if (!h->needs_plt
|
||
&& h->type != STT_GNU_IFUNC
|
||
&& (h->def_regular
|
||
|| !h->def_dynamic
|
||
|| (!h->ref_regular
|
||
&& (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
|
||
{
|
||
h->plt = elf_hash_table (eif->info)->init_plt_offset;
|
||
return TRUE;
|
||
}
|
||
|
||
/* If we've already adjusted this symbol, don't do it again. This
|
||
can happen via a recursive call. */
|
||
if (h->dynamic_adjusted)
|
||
return TRUE;
|
||
|
||
/* Don't look at this symbol again. Note that we must set this
|
||
after checking the above conditions, because we may look at a
|
||
symbol once, decide not to do anything, and then get called
|
||
recursively later after REF_REGULAR is set below. */
|
||
h->dynamic_adjusted = 1;
|
||
|
||
/* If this is a weak definition, and we know a real definition, and
|
||
the real symbol is not itself defined by a regular object file,
|
||
then get a good value for the real definition. We handle the
|
||
real symbol first, for the convenience of the backend routine.
|
||
|
||
Note that there is a confusing case here. If the real definition
|
||
is defined by a regular object file, we don't get the real symbol
|
||
from the dynamic object, but we do get the weak symbol. If the
|
||
processor backend uses a COPY reloc, then if some routine in the
|
||
dynamic object changes the real symbol, we will not see that
|
||
change in the corresponding weak symbol. This is the way other
|
||
ELF linkers work as well, and seems to be a result of the shared
|
||
library model.
|
||
|
||
I will clarify this issue. Most SVR4 shared libraries define the
|
||
variable _timezone and define timezone as a weak synonym. The
|
||
tzset call changes _timezone. If you write
|
||
extern int timezone;
|
||
int _timezone = 5;
|
||
int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
|
||
you might expect that, since timezone is a synonym for _timezone,
|
||
the same number will print both times. However, if the processor
|
||
backend uses a COPY reloc, then actually timezone will be copied
|
||
into your process image, and, since you define _timezone
|
||
yourself, _timezone will not. Thus timezone and _timezone will
|
||
wind up at different memory locations. The tzset call will set
|
||
_timezone, leaving timezone unchanged. */
|
||
|
||
if (h->u.weakdef != NULL)
|
||
{
|
||
/* If we get to this point, there is an implicit reference to
|
||
H->U.WEAKDEF by a regular object file via the weak symbol H. */
|
||
h->u.weakdef->ref_regular = 1;
|
||
|
||
/* Ensure that the backend adjust_dynamic_symbol function sees
|
||
H->U.WEAKDEF before H by recursively calling ourselves. */
|
||
if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
|
||
return FALSE;
|
||
}
|
||
|
||
/* If a symbol has no type and no size and does not require a PLT
|
||
entry, then we are probably about to do the wrong thing here: we
|
||
are probably going to create a COPY reloc for an empty object.
|
||
This case can arise when a shared object is built with assembly
|
||
code, and the assembly code fails to set the symbol type. */
|
||
if (h->size == 0
|
||
&& h->type == STT_NOTYPE
|
||
&& !h->needs_plt)
|
||
(*_bfd_error_handler)
|
||
(_("warning: type and size of dynamic symbol `%s' are not defined"),
|
||
h->root.root.string);
|
||
|
||
dynobj = elf_hash_table (eif->info)->dynobj;
|
||
bed = get_elf_backend_data (dynobj);
|
||
|
||
if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
|
||
{
|
||
eif->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
|
||
DYNBSS. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h,
|
||
asection *dynbss)
|
||
{
|
||
unsigned int power_of_two;
|
||
bfd_vma mask;
|
||
asection *sec = h->root.u.def.section;
|
||
|
||
/* The section aligment of definition is the maximum alignment
|
||
requirement of symbols defined in the section. Since we don't
|
||
know the symbol alignment requirement, we start with the
|
||
maximum alignment and check low bits of the symbol address
|
||
for the minimum alignment. */
|
||
power_of_two = bfd_get_section_alignment (sec->owner, sec);
|
||
mask = ((bfd_vma) 1 << power_of_two) - 1;
|
||
while ((h->root.u.def.value & mask) != 0)
|
||
{
|
||
mask >>= 1;
|
||
--power_of_two;
|
||
}
|
||
|
||
if (power_of_two > bfd_get_section_alignment (dynbss->owner,
|
||
dynbss))
|
||
{
|
||
/* Adjust the section alignment if needed. */
|
||
if (! bfd_set_section_alignment (dynbss->owner, dynbss,
|
||
power_of_two))
|
||
return FALSE;
|
||
}
|
||
|
||
/* We make sure that the symbol will be aligned properly. */
|
||
dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
|
||
|
||
/* Define the symbol as being at this point in DYNBSS. */
|
||
h->root.u.def.section = dynbss;
|
||
h->root.u.def.value = dynbss->size;
|
||
|
||
/* Increment the size of DYNBSS to make room for the symbol. */
|
||
dynbss->size += h->size;
|
||
|
||
/* No error if extern_protected_data is true. */
|
||
if (h->protected_def
|
||
&& (!info->extern_protected_data
|
||
|| (info->extern_protected_data < 0
|
||
&& !get_elf_backend_data (dynbss->owner)->extern_protected_data)))
|
||
info->callbacks->einfo
|
||
(_("%P: copy reloc against protected `%T' is dangerous\n"),
|
||
h->root.root.string);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Adjust all external symbols pointing into SEC_MERGE sections
|
||
to reflect the object merging within the sections. */
|
||
|
||
static bfd_boolean
|
||
_bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
asection *sec;
|
||
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& ((sec = h->root.u.def.section)->flags & SEC_MERGE)
|
||
&& sec->sec_info_type == SEC_INFO_TYPE_MERGE)
|
||
{
|
||
bfd *output_bfd = (bfd *) data;
|
||
|
||
h->root.u.def.value =
|
||
_bfd_merged_section_offset (output_bfd,
|
||
&h->root.u.def.section,
|
||
elf_section_data (sec)->sec_info,
|
||
h->root.u.def.value);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Returns false if the symbol referred to by H should be considered
|
||
to resolve local to the current module, and true if it should be
|
||
considered to bind dynamically. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
|
||
struct bfd_link_info *info,
|
||
bfd_boolean not_local_protected)
|
||
{
|
||
bfd_boolean binding_stays_local_p;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_link_hash_table *hash_table;
|
||
|
||
if (h == NULL)
|
||
return FALSE;
|
||
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* If it was forced local, then clearly it's not dynamic. */
|
||
if (h->dynindx == -1)
|
||
return FALSE;
|
||
if (h->forced_local)
|
||
return FALSE;
|
||
|
||
/* Identify the cases where name binding rules say that a
|
||
visible symbol resolves locally. */
|
||
binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
|
||
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_INTERNAL:
|
||
case STV_HIDDEN:
|
||
return FALSE;
|
||
|
||
case STV_PROTECTED:
|
||
hash_table = elf_hash_table (info);
|
||
if (!is_elf_hash_table (hash_table))
|
||
return FALSE;
|
||
|
||
bed = get_elf_backend_data (hash_table->dynobj);
|
||
|
||
/* Proper resolution for function pointer equality may require
|
||
that these symbols perhaps be resolved dynamically, even though
|
||
we should be resolving them to the current module. */
|
||
if (!not_local_protected || !bed->is_function_type (h->type))
|
||
binding_stays_local_p = TRUE;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* If it isn't defined locally, then clearly it's dynamic. */
|
||
if (!h->def_regular && !ELF_COMMON_DEF_P (h))
|
||
return TRUE;
|
||
|
||
/* Otherwise, the symbol is dynamic if binding rules don't tell
|
||
us that it remains local. */
|
||
return !binding_stays_local_p;
|
||
}
|
||
|
||
/* Return true if the symbol referred to by H should be considered
|
||
to resolve local to the current module, and false otherwise. Differs
|
||
from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
|
||
undefined symbols. The two functions are virtually identical except
|
||
for the place where forced_local and dynindx == -1 are tested. If
|
||
either of those tests are true, _bfd_elf_dynamic_symbol_p will say
|
||
the symbol is local, while _bfd_elf_symbol_refs_local_p will say
|
||
the symbol is local only for defined symbols.
|
||
It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
|
||
!_bfd_elf_symbol_refs_local_p, except that targets differ in their
|
||
treatment of undefined weak symbols. For those that do not make
|
||
undefined weak symbols dynamic, both functions may return false. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
|
||
struct bfd_link_info *info,
|
||
bfd_boolean local_protected)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
struct elf_link_hash_table *hash_table;
|
||
|
||
/* If it's a local sym, of course we resolve locally. */
|
||
if (h == NULL)
|
||
return TRUE;
|
||
|
||
/* STV_HIDDEN or STV_INTERNAL ones must be local. */
|
||
if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
|
||
|| ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
|
||
return TRUE;
|
||
|
||
/* Common symbols that become definitions don't get the DEF_REGULAR
|
||
flag set, so test it first, and don't bail out. */
|
||
if (ELF_COMMON_DEF_P (h))
|
||
/* Do nothing. */;
|
||
/* If we don't have a definition in a regular file, then we can't
|
||
resolve locally. The sym is either undefined or dynamic. */
|
||
else if (!h->def_regular)
|
||
return FALSE;
|
||
|
||
/* Forced local symbols resolve locally. */
|
||
if (h->forced_local)
|
||
return TRUE;
|
||
|
||
/* As do non-dynamic symbols. */
|
||
if (h->dynindx == -1)
|
||
return TRUE;
|
||
|
||
/* At this point, we know the symbol is defined and dynamic. In an
|
||
executable it must resolve locally, likewise when building symbolic
|
||
shared libraries. */
|
||
if (info->executable || SYMBOLIC_BIND (info, h))
|
||
return TRUE;
|
||
|
||
/* Now deal with defined dynamic symbols in shared libraries. Ones
|
||
with default visibility might not resolve locally. */
|
||
if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
|
||
return FALSE;
|
||
|
||
hash_table = elf_hash_table (info);
|
||
if (!is_elf_hash_table (hash_table))
|
||
return TRUE;
|
||
|
||
bed = get_elf_backend_data (hash_table->dynobj);
|
||
|
||
/* If extern_protected_data is false, STV_PROTECTED non-function
|
||
symbols are local. */
|
||
if ((!info->extern_protected_data
|
||
|| (info->extern_protected_data < 0
|
||
&& !bed->extern_protected_data))
|
||
&& !bed->is_function_type (h->type))
|
||
return TRUE;
|
||
|
||
/* Function pointer equality tests may require that STV_PROTECTED
|
||
symbols be treated as dynamic symbols. If the address of a
|
||
function not defined in an executable is set to that function's
|
||
plt entry in the executable, then the address of the function in
|
||
a shared library must also be the plt entry in the executable. */
|
||
return local_protected;
|
||
}
|
||
|
||
/* Caches some TLS segment info, and ensures that the TLS segment vma is
|
||
aligned. Returns the first TLS output section. */
|
||
|
||
struct bfd_section *
|
||
_bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
|
||
{
|
||
struct bfd_section *sec, *tls;
|
||
unsigned int align = 0;
|
||
|
||
for (sec = obfd->sections; sec != NULL; sec = sec->next)
|
||
if ((sec->flags & SEC_THREAD_LOCAL) != 0)
|
||
break;
|
||
tls = sec;
|
||
|
||
for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
|
||
if (sec->alignment_power > align)
|
||
align = sec->alignment_power;
|
||
|
||
elf_hash_table (info)->tls_sec = tls;
|
||
|
||
/* Ensure the alignment of the first section is the largest alignment,
|
||
so that the tls segment starts aligned. */
|
||
if (tls != NULL)
|
||
tls->alignment_power = align;
|
||
|
||
return tls;
|
||
}
|
||
|
||
/* Return TRUE iff this is a non-common, definition of a non-function symbol. */
|
||
static bfd_boolean
|
||
is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
/* Local symbols do not count, but target specific ones might. */
|
||
if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
|
||
&& ELF_ST_BIND (sym->st_info) < STB_LOOS)
|
||
return FALSE;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
/* Function symbols do not count. */
|
||
if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
|
||
return FALSE;
|
||
|
||
/* If the section is undefined, then so is the symbol. */
|
||
if (sym->st_shndx == SHN_UNDEF)
|
||
return FALSE;
|
||
|
||
/* If the symbol is defined in the common section, then
|
||
it is a common definition and so does not count. */
|
||
if (bed->common_definition (sym))
|
||
return FALSE;
|
||
|
||
/* If the symbol is in a target specific section then we
|
||
must rely upon the backend to tell us what it is. */
|
||
if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
|
||
/* FIXME - this function is not coded yet:
|
||
|
||
return _bfd_is_global_symbol_definition (abfd, sym);
|
||
|
||
Instead for now assume that the definition is not global,
|
||
Even if this is wrong, at least the linker will behave
|
||
in the same way that it used to do. */
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Search the symbol table of the archive element of the archive ABFD
|
||
whose archive map contains a mention of SYMDEF, and determine if
|
||
the symbol is defined in this element. */
|
||
static bfd_boolean
|
||
elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
|
||
{
|
||
Elf_Internal_Shdr * hdr;
|
||
bfd_size_type symcount;
|
||
bfd_size_type extsymcount;
|
||
bfd_size_type extsymoff;
|
||
Elf_Internal_Sym *isymbuf;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
bfd_boolean result;
|
||
|
||
abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
|
||
if (abfd == NULL)
|
||
return FALSE;
|
||
|
||
/* Return FALSE if the object has been claimed by plugin. */
|
||
if (abfd->plugin_format == bfd_plugin_yes)
|
||
return FALSE;
|
||
|
||
if (! bfd_check_format (abfd, bfd_object))
|
||
return FALSE;
|
||
|
||
/* Select the appropriate symbol table. */
|
||
if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
|
||
hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
else
|
||
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
|
||
|
||
symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols. */
|
||
if (elf_bad_symtab (abfd))
|
||
{
|
||
extsymcount = symcount;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
extsymcount = symcount - hdr->sh_info;
|
||
extsymoff = hdr->sh_info;
|
||
}
|
||
|
||
if (extsymcount == 0)
|
||
return FALSE;
|
||
|
||
/* Read in the symbol table. */
|
||
isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
return FALSE;
|
||
|
||
/* Scan the symbol table looking for SYMDEF. */
|
||
result = FALSE;
|
||
for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
|
||
{
|
||
const char *name;
|
||
|
||
name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
break;
|
||
|
||
if (strcmp (name, symdef->name) == 0)
|
||
{
|
||
result = is_global_data_symbol_definition (abfd, isym);
|
||
break;
|
||
}
|
||
}
|
||
|
||
free (isymbuf);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Add an entry to the .dynamic table. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
|
||
bfd_vma tag,
|
||
bfd_vma val)
|
||
{
|
||
struct elf_link_hash_table *hash_table;
|
||
const struct elf_backend_data *bed;
|
||
asection *s;
|
||
bfd_size_type newsize;
|
||
bfd_byte *newcontents;
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
hash_table = elf_hash_table (info);
|
||
if (! is_elf_hash_table (hash_table))
|
||
return FALSE;
|
||
|
||
bed = get_elf_backend_data (hash_table->dynobj);
|
||
s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
newsize = s->size + bed->s->sizeof_dyn;
|
||
newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
|
||
if (newcontents == NULL)
|
||
return FALSE;
|
||
|
||
dyn.d_tag = tag;
|
||
dyn.d_un.d_val = val;
|
||
bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
|
||
|
||
s->size = newsize;
|
||
s->contents = newcontents;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
|
||
otherwise just check whether one already exists. Returns -1 on error,
|
||
1 if a DT_NEEDED tag already exists, and 0 on success. */
|
||
|
||
static int
|
||
elf_add_dt_needed_tag (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
const char *soname,
|
||
bfd_boolean do_it)
|
||
{
|
||
struct elf_link_hash_table *hash_table;
|
||
bfd_size_type strindex;
|
||
|
||
if (!_bfd_elf_link_create_dynstrtab (abfd, info))
|
||
return -1;
|
||
|
||
hash_table = elf_hash_table (info);
|
||
strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
|
||
if (strindex == (bfd_size_type) -1)
|
||
return -1;
|
||
|
||
if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
|
||
{
|
||
asection *sdyn;
|
||
const struct elf_backend_data *bed;
|
||
bfd_byte *extdyn;
|
||
|
||
bed = get_elf_backend_data (hash_table->dynobj);
|
||
sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
|
||
if (sdyn != NULL)
|
||
for (extdyn = sdyn->contents;
|
||
extdyn < sdyn->contents + sdyn->size;
|
||
extdyn += bed->s->sizeof_dyn)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
|
||
if (dyn.d_tag == DT_NEEDED
|
||
&& dyn.d_un.d_val == strindex)
|
||
{
|
||
_bfd_elf_strtab_delref (hash_table->dynstr, strindex);
|
||
return 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (do_it)
|
||
{
|
||
if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
|
||
return -1;
|
||
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
|
||
return -1;
|
||
}
|
||
else
|
||
/* We were just checking for existence of the tag. */
|
||
_bfd_elf_strtab_delref (hash_table->dynstr, strindex);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static bfd_boolean
|
||
on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
|
||
{
|
||
for (; needed != NULL; needed = needed->next)
|
||
if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
|
||
&& strcmp (soname, needed->name) == 0)
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Sort symbol by value, section, and size. */
|
||
static int
|
||
elf_sort_symbol (const void *arg1, const void *arg2)
|
||
{
|
||
const struct elf_link_hash_entry *h1;
|
||
const struct elf_link_hash_entry *h2;
|
||
bfd_signed_vma vdiff;
|
||
|
||
h1 = *(const struct elf_link_hash_entry **) arg1;
|
||
h2 = *(const struct elf_link_hash_entry **) arg2;
|
||
vdiff = h1->root.u.def.value - h2->root.u.def.value;
|
||
if (vdiff != 0)
|
||
return vdiff > 0 ? 1 : -1;
|
||
else
|
||
{
|
||
long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
|
||
if (sdiff != 0)
|
||
return sdiff > 0 ? 1 : -1;
|
||
}
|
||
vdiff = h1->size - h2->size;
|
||
return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
|
||
}
|
||
|
||
/* This function is used to adjust offsets into .dynstr for
|
||
dynamic symbols. This is called via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
|
||
|
||
if (h->dynindx != -1)
|
||
h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
|
||
return TRUE;
|
||
}
|
||
|
||
/* Assign string offsets in .dynstr, update all structures referencing
|
||
them. */
|
||
|
||
static bfd_boolean
|
||
elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf_link_hash_table *hash_table = elf_hash_table (info);
|
||
struct elf_link_local_dynamic_entry *entry;
|
||
struct elf_strtab_hash *dynstr = hash_table->dynstr;
|
||
bfd *dynobj = hash_table->dynobj;
|
||
asection *sdyn;
|
||
bfd_size_type size;
|
||
const struct elf_backend_data *bed;
|
||
bfd_byte *extdyn;
|
||
|
||
_bfd_elf_strtab_finalize (dynstr);
|
||
size = _bfd_elf_strtab_size (dynstr);
|
||
|
||
bed = get_elf_backend_data (dynobj);
|
||
sdyn = bfd_get_linker_section (dynobj, ".dynamic");
|
||
BFD_ASSERT (sdyn != NULL);
|
||
|
||
/* Update all .dynamic entries referencing .dynstr strings. */
|
||
for (extdyn = sdyn->contents;
|
||
extdyn < sdyn->contents + sdyn->size;
|
||
extdyn += bed->s->sizeof_dyn)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
|
||
switch (dyn.d_tag)
|
||
{
|
||
case DT_STRSZ:
|
||
dyn.d_un.d_val = size;
|
||
break;
|
||
case DT_NEEDED:
|
||
case DT_SONAME:
|
||
case DT_RPATH:
|
||
case DT_RUNPATH:
|
||
case DT_FILTER:
|
||
case DT_AUXILIARY:
|
||
case DT_AUDIT:
|
||
case DT_DEPAUDIT:
|
||
dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
|
||
break;
|
||
default:
|
||
continue;
|
||
}
|
||
bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
|
||
}
|
||
|
||
/* Now update local dynamic symbols. */
|
||
for (entry = hash_table->dynlocal; entry ; entry = entry->next)
|
||
entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
|
||
entry->isym.st_name);
|
||
|
||
/* And the rest of dynamic symbols. */
|
||
elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
|
||
|
||
/* Adjust version definitions. */
|
||
if (elf_tdata (output_bfd)->cverdefs)
|
||
{
|
||
asection *s;
|
||
bfd_byte *p;
|
||
bfd_size_type i;
|
||
Elf_Internal_Verdef def;
|
||
Elf_Internal_Verdaux defaux;
|
||
|
||
s = bfd_get_linker_section (dynobj, ".gnu.version_d");
|
||
p = s->contents;
|
||
do
|
||
{
|
||
_bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
|
||
&def);
|
||
p += sizeof (Elf_External_Verdef);
|
||
if (def.vd_aux != sizeof (Elf_External_Verdef))
|
||
continue;
|
||
for (i = 0; i < def.vd_cnt; ++i)
|
||
{
|
||
_bfd_elf_swap_verdaux_in (output_bfd,
|
||
(Elf_External_Verdaux *) p, &defaux);
|
||
defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
|
||
defaux.vda_name);
|
||
_bfd_elf_swap_verdaux_out (output_bfd,
|
||
&defaux, (Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
}
|
||
}
|
||
while (def.vd_next);
|
||
}
|
||
|
||
/* Adjust version references. */
|
||
if (elf_tdata (output_bfd)->verref)
|
||
{
|
||
asection *s;
|
||
bfd_byte *p;
|
||
bfd_size_type i;
|
||
Elf_Internal_Verneed need;
|
||
Elf_Internal_Vernaux needaux;
|
||
|
||
s = bfd_get_linker_section (dynobj, ".gnu.version_r");
|
||
p = s->contents;
|
||
do
|
||
{
|
||
_bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
|
||
&need);
|
||
need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
|
||
_bfd_elf_swap_verneed_out (output_bfd, &need,
|
||
(Elf_External_Verneed *) p);
|
||
p += sizeof (Elf_External_Verneed);
|
||
for (i = 0; i < need.vn_cnt; ++i)
|
||
{
|
||
_bfd_elf_swap_vernaux_in (output_bfd,
|
||
(Elf_External_Vernaux *) p, &needaux);
|
||
needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
|
||
needaux.vna_name);
|
||
_bfd_elf_swap_vernaux_out (output_bfd,
|
||
&needaux,
|
||
(Elf_External_Vernaux *) p);
|
||
p += sizeof (Elf_External_Vernaux);
|
||
}
|
||
}
|
||
while (need.vn_next);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
|
||
The default is to only match when the INPUT and OUTPUT are exactly
|
||
the same target. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_default_relocs_compatible (const bfd_target *input,
|
||
const bfd_target *output)
|
||
{
|
||
return input == output;
|
||
}
|
||
|
||
/* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
|
||
This version is used when different targets for the same architecture
|
||
are virtually identical. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_relocs_compatible (const bfd_target *input,
|
||
const bfd_target *output)
|
||
{
|
||
const struct elf_backend_data *obed, *ibed;
|
||
|
||
if (input == output)
|
||
return TRUE;
|
||
|
||
ibed = xvec_get_elf_backend_data (input);
|
||
obed = xvec_get_elf_backend_data (output);
|
||
|
||
if (ibed->arch != obed->arch)
|
||
return FALSE;
|
||
|
||
/* If both backends are using this function, deem them compatible. */
|
||
return ibed->relocs_compatible == obed->relocs_compatible;
|
||
}
|
||
|
||
/* Make a special call to the linker "notice" function to tell it that
|
||
we are about to handle an as-needed lib, or have finished
|
||
processing the lib. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_notice_as_needed (bfd *ibfd,
|
||
struct bfd_link_info *info,
|
||
enum notice_asneeded_action act)
|
||
{
|
||
return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
|
||
}
|
||
|
||
/* Add symbols from an ELF object file to the linker hash table. */
|
||
|
||
static bfd_boolean
|
||
elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
Elf_Internal_Ehdr *ehdr;
|
||
Elf_Internal_Shdr *hdr;
|
||
bfd_size_type symcount;
|
||
bfd_size_type extsymcount;
|
||
bfd_size_type extsymoff;
|
||
struct elf_link_hash_entry **sym_hash;
|
||
bfd_boolean dynamic;
|
||
Elf_External_Versym *extversym = NULL;
|
||
Elf_External_Versym *ever;
|
||
struct elf_link_hash_entry *weaks;
|
||
struct elf_link_hash_entry **nondeflt_vers = NULL;
|
||
bfd_size_type nondeflt_vers_cnt = 0;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
const struct elf_backend_data *bed;
|
||
bfd_boolean add_needed;
|
||
struct elf_link_hash_table *htab;
|
||
bfd_size_type amt;
|
||
void *alloc_mark = NULL;
|
||
struct bfd_hash_entry **old_table = NULL;
|
||
unsigned int old_size = 0;
|
||
unsigned int old_count = 0;
|
||
void *old_tab = NULL;
|
||
void *old_ent;
|
||
struct bfd_link_hash_entry *old_undefs = NULL;
|
||
struct bfd_link_hash_entry *old_undefs_tail = NULL;
|
||
long old_dynsymcount = 0;
|
||
bfd_size_type old_dynstr_size = 0;
|
||
size_t tabsize = 0;
|
||
asection *s;
|
||
bfd_boolean just_syms;
|
||
|
||
htab = elf_hash_table (info);
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
if ((abfd->flags & DYNAMIC) == 0)
|
||
dynamic = FALSE;
|
||
else
|
||
{
|
||
dynamic = TRUE;
|
||
|
||
/* You can't use -r against a dynamic object. Also, there's no
|
||
hope of using a dynamic object which does not exactly match
|
||
the format of the output file. */
|
||
if (info->relocatable
|
||
|| !is_elf_hash_table (htab)
|
||
|| info->output_bfd->xvec != abfd->xvec)
|
||
{
|
||
if (info->relocatable)
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
else
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
ehdr = elf_elfheader (abfd);
|
||
if (info->warn_alternate_em
|
||
&& bed->elf_machine_code != ehdr->e_machine
|
||
&& ((bed->elf_machine_alt1 != 0
|
||
&& ehdr->e_machine == bed->elf_machine_alt1)
|
||
|| (bed->elf_machine_alt2 != 0
|
||
&& ehdr->e_machine == bed->elf_machine_alt2)))
|
||
info->callbacks->einfo
|
||
(_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
|
||
ehdr->e_machine, abfd, bed->elf_machine_code);
|
||
|
||
/* As a GNU extension, any input sections which are named
|
||
.gnu.warning.SYMBOL are treated as warning symbols for the given
|
||
symbol. This differs from .gnu.warning sections, which generate
|
||
warnings when they are included in an output file. */
|
||
/* PR 12761: Also generate this warning when building shared libraries. */
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
const char *name;
|
||
|
||
name = bfd_get_section_name (abfd, s);
|
||
if (CONST_STRNEQ (name, ".gnu.warning."))
|
||
{
|
||
char *msg;
|
||
bfd_size_type sz;
|
||
|
||
name += sizeof ".gnu.warning." - 1;
|
||
|
||
/* If this is a shared object, then look up the symbol
|
||
in the hash table. If it is there, and it is already
|
||
been defined, then we will not be using the entry
|
||
from this shared object, so we don't need to warn.
|
||
FIXME: If we see the definition in a regular object
|
||
later on, we will warn, but we shouldn't. The only
|
||
fix is to keep track of what warnings we are supposed
|
||
to emit, and then handle them all at the end of the
|
||
link. */
|
||
if (dynamic)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
|
||
|
||
/* FIXME: What about bfd_link_hash_common? */
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
continue;
|
||
}
|
||
|
||
sz = s->size;
|
||
msg = (char *) bfd_alloc (abfd, sz + 1);
|
||
if (msg == NULL)
|
||
goto error_return;
|
||
|
||
if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
|
||
goto error_return;
|
||
|
||
msg[sz] = '\0';
|
||
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, name, BSF_WARNING, s, 0, msg,
|
||
FALSE, bed->collect, NULL)))
|
||
goto error_return;
|
||
|
||
if (!info->relocatable && info->executable)
|
||
{
|
||
/* Clobber the section size so that the warning does
|
||
not get copied into the output file. */
|
||
s->size = 0;
|
||
|
||
/* Also set SEC_EXCLUDE, so that symbols defined in
|
||
the warning section don't get copied to the output. */
|
||
s->flags |= SEC_EXCLUDE;
|
||
}
|
||
}
|
||
}
|
||
|
||
just_syms = ((s = abfd->sections) != NULL
|
||
&& s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
|
||
|
||
add_needed = TRUE;
|
||
if (! dynamic)
|
||
{
|
||
/* If we are creating a shared library, create all the dynamic
|
||
sections immediately. We need to attach them to something,
|
||
so we attach them to this BFD, provided it is the right
|
||
format and is not from ld --just-symbols. FIXME: If there
|
||
are no input BFD's of the same format as the output, we can't
|
||
make a shared library. */
|
||
if (!just_syms
|
||
&& info->shared
|
||
&& is_elf_hash_table (htab)
|
||
&& info->output_bfd->xvec == abfd->xvec
|
||
&& !htab->dynamic_sections_created)
|
||
{
|
||
if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
|
||
goto error_return;
|
||
}
|
||
}
|
||
else if (!is_elf_hash_table (htab))
|
||
goto error_return;
|
||
else
|
||
{
|
||
const char *soname = NULL;
|
||
char *audit = NULL;
|
||
struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
|
||
int ret;
|
||
|
||
/* ld --just-symbols and dynamic objects don't mix very well.
|
||
ld shouldn't allow it. */
|
||
if (just_syms)
|
||
abort ();
|
||
|
||
/* If this dynamic lib was specified on the command line with
|
||
--as-needed in effect, then we don't want to add a DT_NEEDED
|
||
tag unless the lib is actually used. Similary for libs brought
|
||
in by another lib's DT_NEEDED. When --no-add-needed is used
|
||
on a dynamic lib, we don't want to add a DT_NEEDED entry for
|
||
any dynamic library in DT_NEEDED tags in the dynamic lib at
|
||
all. */
|
||
add_needed = (elf_dyn_lib_class (abfd)
|
||
& (DYN_AS_NEEDED | DYN_DT_NEEDED
|
||
| DYN_NO_NEEDED)) == 0;
|
||
|
||
s = bfd_get_section_by_name (abfd, ".dynamic");
|
||
if (s != NULL)
|
||
{
|
||
bfd_byte *dynbuf;
|
||
bfd_byte *extdyn;
|
||
unsigned int elfsec;
|
||
unsigned long shlink;
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
|
||
{
|
||
error_free_dyn:
|
||
free (dynbuf);
|
||
goto error_return;
|
||
}
|
||
|
||
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
|
||
if (elfsec == SHN_BAD)
|
||
goto error_free_dyn;
|
||
shlink = elf_elfsections (abfd)[elfsec]->sh_link;
|
||
|
||
for (extdyn = dynbuf;
|
||
extdyn < dynbuf + s->size;
|
||
extdyn += bed->s->sizeof_dyn)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
bed->s->swap_dyn_in (abfd, extdyn, &dyn);
|
||
if (dyn.d_tag == DT_SONAME)
|
||
{
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (soname == NULL)
|
||
goto error_free_dyn;
|
||
}
|
||
if (dyn.d_tag == DT_NEEDED)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
|
||
amt = sizeof (struct bfd_link_needed_list);
|
||
n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
|
||
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_free_dyn;
|
||
amt = strlen (fnm) + 1;
|
||
anm = (char *) bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
goto error_free_dyn;
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
if (dyn.d_tag == DT_RUNPATH)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
|
||
amt = sizeof (struct bfd_link_needed_list);
|
||
n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
|
||
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_free_dyn;
|
||
amt = strlen (fnm) + 1;
|
||
anm = (char *) bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
goto error_free_dyn;
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = & runpath;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
/* Ignore DT_RPATH if we have seen DT_RUNPATH. */
|
||
if (!runpath && dyn.d_tag == DT_RPATH)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
|
||
amt = sizeof (struct bfd_link_needed_list);
|
||
n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
|
||
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_free_dyn;
|
||
amt = strlen (fnm) + 1;
|
||
anm = (char *) bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
goto error_free_dyn;
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = & rpath;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
if (dyn.d_tag == DT_AUDIT)
|
||
{
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
}
|
||
}
|
||
|
||
free (dynbuf);
|
||
}
|
||
|
||
/* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
|
||
frees all more recently bfd_alloc'd blocks as well. */
|
||
if (runpath)
|
||
rpath = runpath;
|
||
|
||
if (rpath)
|
||
{
|
||
struct bfd_link_needed_list **pn;
|
||
for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
|
||
;
|
||
*pn = rpath;
|
||
}
|
||
|
||
/* We do not want to include any of the sections in a dynamic
|
||
object in the output file. We hack by simply clobbering the
|
||
list of sections in the BFD. This could be handled more
|
||
cleanly by, say, a new section flag; the existing
|
||
SEC_NEVER_LOAD flag is not the one we want, because that one
|
||
still implies that the section takes up space in the output
|
||
file. */
|
||
bfd_section_list_clear (abfd);
|
||
|
||
/* Find the name to use in a DT_NEEDED entry that refers to this
|
||
object. If the object has a DT_SONAME entry, we use it.
|
||
Otherwise, if the generic linker stuck something in
|
||
elf_dt_name, we use that. Otherwise, we just use the file
|
||
name. */
|
||
if (soname == NULL || *soname == '\0')
|
||
{
|
||
soname = elf_dt_name (abfd);
|
||
if (soname == NULL || *soname == '\0')
|
||
soname = bfd_get_filename (abfd);
|
||
}
|
||
|
||
/* Save the SONAME because sometimes the linker emulation code
|
||
will need to know it. */
|
||
elf_dt_name (abfd) = soname;
|
||
|
||
ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
|
||
if (ret < 0)
|
||
goto error_return;
|
||
|
||
/* If we have already included this dynamic object in the
|
||
link, just ignore it. There is no reason to include a
|
||
particular dynamic object more than once. */
|
||
if (ret > 0)
|
||
return TRUE;
|
||
|
||
/* Save the DT_AUDIT entry for the linker emulation code. */
|
||
elf_dt_audit (abfd) = audit;
|
||
}
|
||
|
||
/* If this is a dynamic object, we always link against the .dynsym
|
||
symbol table, not the .symtab symbol table. The dynamic linker
|
||
will only see the .dynsym symbol table, so there is no reason to
|
||
look at .symtab for a dynamic object. */
|
||
|
||
if (! dynamic || elf_dynsymtab (abfd) == 0)
|
||
hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
else
|
||
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
|
||
|
||
symcount = hdr->sh_size / bed->s->sizeof_sym;
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols at
|
||
this point. */
|
||
if (elf_bad_symtab (abfd))
|
||
{
|
||
extsymcount = symcount;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
extsymcount = symcount - hdr->sh_info;
|
||
extsymoff = hdr->sh_info;
|
||
}
|
||
|
||
sym_hash = elf_sym_hashes (abfd);
|
||
if (extsymcount != 0)
|
||
{
|
||
isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
goto error_return;
|
||
|
||
if (sym_hash == NULL)
|
||
{
|
||
/* We store a pointer to the hash table entry for each
|
||
external symbol. */
|
||
amt = extsymcount * sizeof (struct elf_link_hash_entry *);
|
||
sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
|
||
if (sym_hash == NULL)
|
||
goto error_free_sym;
|
||
elf_sym_hashes (abfd) = sym_hash;
|
||
}
|
||
}
|
||
|
||
if (dynamic)
|
||
{
|
||
/* Read in any version definitions. */
|
||
if (!_bfd_elf_slurp_version_tables (abfd,
|
||
info->default_imported_symver))
|
||
goto error_free_sym;
|
||
|
||
/* Read in the symbol versions, but don't bother to convert them
|
||
to internal format. */
|
||
if (elf_dynversym (abfd) != 0)
|
||
{
|
||
Elf_Internal_Shdr *versymhdr;
|
||
|
||
versymhdr = &elf_tdata (abfd)->dynversym_hdr;
|
||
extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
|
||
if (extversym == NULL)
|
||
goto error_free_sym;
|
||
amt = versymhdr->sh_size;
|
||
if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
|
||
|| bfd_bread (extversym, amt, abfd) != amt)
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
|
||
/* If we are loading an as-needed shared lib, save the symbol table
|
||
state before we start adding symbols. If the lib turns out
|
||
to be unneeded, restore the state. */
|
||
if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
|
||
{
|
||
unsigned int i;
|
||
size_t entsize;
|
||
|
||
for (entsize = 0, i = 0; i < htab->root.table.size; i++)
|
||
{
|
||
struct bfd_hash_entry *p;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
for (p = htab->root.table.table[i]; p != NULL; p = p->next)
|
||
{
|
||
h = (struct elf_link_hash_entry *) p;
|
||
entsize += htab->root.table.entsize;
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
entsize += htab->root.table.entsize;
|
||
}
|
||
}
|
||
|
||
tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
|
||
old_tab = bfd_malloc (tabsize + entsize);
|
||
if (old_tab == NULL)
|
||
goto error_free_vers;
|
||
|
||
/* Remember the current objalloc pointer, so that all mem for
|
||
symbols added can later be reclaimed. */
|
||
alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
|
||
if (alloc_mark == NULL)
|
||
goto error_free_vers;
|
||
|
||
/* Make a special call to the linker "notice" function to
|
||
tell it that we are about to handle an as-needed lib. */
|
||
if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
|
||
goto error_free_vers;
|
||
|
||
/* Clone the symbol table. Remember some pointers into the
|
||
symbol table, and dynamic symbol count. */
|
||
old_ent = (char *) old_tab + tabsize;
|
||
memcpy (old_tab, htab->root.table.table, tabsize);
|
||
old_undefs = htab->root.undefs;
|
||
old_undefs_tail = htab->root.undefs_tail;
|
||
old_table = htab->root.table.table;
|
||
old_size = htab->root.table.size;
|
||
old_count = htab->root.table.count;
|
||
old_dynsymcount = htab->dynsymcount;
|
||
old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
|
||
|
||
for (i = 0; i < htab->root.table.size; i++)
|
||
{
|
||
struct bfd_hash_entry *p;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
for (p = htab->root.table.table[i]; p != NULL; p = p->next)
|
||
{
|
||
memcpy (old_ent, p, htab->root.table.entsize);
|
||
old_ent = (char *) old_ent + htab->root.table.entsize;
|
||
h = (struct elf_link_hash_entry *) p;
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
{
|
||
memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
|
||
old_ent = (char *) old_ent + htab->root.table.entsize;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
weaks = NULL;
|
||
ever = extversym != NULL ? extversym + extsymoff : NULL;
|
||
for (isym = isymbuf, isymend = isymbuf + extsymcount;
|
||
isym < isymend;
|
||
isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
|
||
{
|
||
int bind;
|
||
bfd_vma value;
|
||
asection *sec, *new_sec;
|
||
flagword flags;
|
||
const char *name;
|
||
struct elf_link_hash_entry *h;
|
||
struct elf_link_hash_entry *hi;
|
||
bfd_boolean definition;
|
||
bfd_boolean size_change_ok;
|
||
bfd_boolean type_change_ok;
|
||
bfd_boolean new_weakdef;
|
||
bfd_boolean new_weak;
|
||
bfd_boolean old_weak;
|
||
bfd_boolean override;
|
||
bfd_boolean common;
|
||
unsigned int old_alignment;
|
||
bfd *old_bfd;
|
||
|
||
override = FALSE;
|
||
|
||
flags = BSF_NO_FLAGS;
|
||
sec = NULL;
|
||
value = isym->st_value;
|
||
common = bed->common_definition (isym);
|
||
|
||
bind = ELF_ST_BIND (isym->st_info);
|
||
switch (bind)
|
||
{
|
||
case STB_LOCAL:
|
||
/* This should be impossible, since ELF requires that all
|
||
global symbols follow all local symbols, and that sh_info
|
||
point to the first global symbol. Unfortunately, Irix 5
|
||
screws this up. */
|
||
continue;
|
||
|
||
case STB_GLOBAL:
|
||
if (isym->st_shndx != SHN_UNDEF && !common)
|
||
flags = BSF_GLOBAL;
|
||
break;
|
||
|
||
case STB_WEAK:
|
||
flags = BSF_WEAK;
|
||
break;
|
||
|
||
case STB_GNU_UNIQUE:
|
||
flags = BSF_GNU_UNIQUE;
|
||
break;
|
||
|
||
default:
|
||
/* Leave it up to the processor backend. */
|
||
break;
|
||
}
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
sec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
sec = bfd_abs_section_ptr;
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
{
|
||
sec = bfd_com_section_ptr;
|
||
/* What ELF calls the size we call the value. What ELF
|
||
calls the value we call the alignment. */
|
||
value = isym->st_size;
|
||
}
|
||
else
|
||
{
|
||
sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
|
||
if (sec == NULL)
|
||
sec = bfd_abs_section_ptr;
|
||
else if (discarded_section (sec))
|
||
{
|
||
/* Symbols from discarded section are undefined. We keep
|
||
its visibility. */
|
||
sec = bfd_und_section_ptr;
|
||
isym->st_shndx = SHN_UNDEF;
|
||
}
|
||
else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
value -= sec->vma;
|
||
}
|
||
|
||
name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
goto error_free_vers;
|
||
|
||
if (isym->st_shndx == SHN_COMMON
|
||
&& (abfd->flags & BFD_PLUGIN) != 0)
|
||
{
|
||
asection *xc = bfd_get_section_by_name (abfd, "COMMON");
|
||
|
||
if (xc == NULL)
|
||
{
|
||
flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
|
||
| SEC_EXCLUDE);
|
||
xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
|
||
if (xc == NULL)
|
||
goto error_free_vers;
|
||
}
|
||
sec = xc;
|
||
}
|
||
else if (isym->st_shndx == SHN_COMMON
|
||
&& ELF_ST_TYPE (isym->st_info) == STT_TLS
|
||
&& !info->relocatable)
|
||
{
|
||
asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
|
||
|
||
if (tcomm == NULL)
|
||
{
|
||
flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
|
||
| SEC_LINKER_CREATED);
|
||
tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
|
||
if (tcomm == NULL)
|
||
goto error_free_vers;
|
||
}
|
||
sec = tcomm;
|
||
}
|
||
else if (bed->elf_add_symbol_hook)
|
||
{
|
||
if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
|
||
&sec, &value))
|
||
goto error_free_vers;
|
||
|
||
/* The hook function sets the name to NULL if this symbol
|
||
should be skipped for some reason. */
|
||
if (name == NULL)
|
||
continue;
|
||
}
|
||
|
||
/* Sanity check that all possibilities were handled. */
|
||
if (sec == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
|
||
/* Silently discard TLS symbols from --just-syms. There's
|
||
no way to combine a static TLS block with a new TLS block
|
||
for this executable. */
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_TLS
|
||
&& sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
|
||
continue;
|
||
|
||
if (bfd_is_und_section (sec)
|
||
|| bfd_is_com_section (sec))
|
||
definition = FALSE;
|
||
else
|
||
definition = TRUE;
|
||
|
||
size_change_ok = FALSE;
|
||
type_change_ok = bed->type_change_ok;
|
||
old_weak = FALSE;
|
||
old_alignment = 0;
|
||
old_bfd = NULL;
|
||
new_sec = sec;
|
||
|
||
if (is_elf_hash_table (htab))
|
||
{
|
||
Elf_Internal_Versym iver;
|
||
unsigned int vernum = 0;
|
||
bfd_boolean skip;
|
||
|
||
if (ever == NULL)
|
||
{
|
||
if (info->default_imported_symver)
|
||
/* Use the default symbol version created earlier. */
|
||
iver.vs_vers = elf_tdata (abfd)->cverdefs;
|
||
else
|
||
iver.vs_vers = 0;
|
||
}
|
||
else
|
||
_bfd_elf_swap_versym_in (abfd, ever, &iver);
|
||
|
||
vernum = iver.vs_vers & VERSYM_VERSION;
|
||
|
||
/* If this is a hidden symbol, or if it is not version
|
||
1, we append the version name to the symbol name.
|
||
However, we do not modify a non-hidden absolute symbol
|
||
if it is not a function, because it might be the version
|
||
symbol itself. FIXME: What if it isn't? */
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) != 0
|
||
|| (vernum > 1
|
||
&& (!bfd_is_abs_section (sec)
|
||
|| bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
|
||
{
|
||
const char *verstr;
|
||
size_t namelen, verlen, newlen;
|
||
char *newname, *p;
|
||
|
||
if (isym->st_shndx != SHN_UNDEF)
|
||
{
|
||
if (vernum > elf_tdata (abfd)->cverdefs)
|
||
verstr = NULL;
|
||
else if (vernum > 1)
|
||
verstr =
|
||
elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
|
||
else
|
||
verstr = "";
|
||
|
||
if (verstr == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: %s: invalid version %u (max %d)"),
|
||
abfd, name, vernum,
|
||
elf_tdata (abfd)->cverdefs);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We cannot simply test for the number of
|
||
entries in the VERNEED section since the
|
||
numbers for the needed versions do not start
|
||
at 0. */
|
||
Elf_Internal_Verneed *t;
|
||
|
||
verstr = NULL;
|
||
for (t = elf_tdata (abfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
{
|
||
if (a->vna_other == vernum)
|
||
{
|
||
verstr = a->vna_nodename;
|
||
break;
|
||
}
|
||
}
|
||
if (a != NULL)
|
||
break;
|
||
}
|
||
if (verstr == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: %s: invalid needed version %d"),
|
||
abfd, name, vernum);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
|
||
namelen = strlen (name);
|
||
verlen = strlen (verstr);
|
||
newlen = namelen + verlen + 2;
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
|
||
&& isym->st_shndx != SHN_UNDEF)
|
||
++newlen;
|
||
|
||
newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
|
||
if (newname == NULL)
|
||
goto error_free_vers;
|
||
memcpy (newname, name, namelen);
|
||
p = newname + namelen;
|
||
*p++ = ELF_VER_CHR;
|
||
/* If this is a defined non-hidden version symbol,
|
||
we add another @ to the name. This indicates the
|
||
default version of the symbol. */
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
|
||
&& isym->st_shndx != SHN_UNDEF)
|
||
*p++ = ELF_VER_CHR;
|
||
memcpy (p, verstr, verlen + 1);
|
||
|
||
name = newname;
|
||
}
|
||
|
||
/* If this symbol has default visibility and the user has
|
||
requested we not re-export it, then mark it as hidden. */
|
||
if (definition
|
||
&& !dynamic
|
||
&& abfd->no_export
|
||
&& ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
|
||
isym->st_other = (STV_HIDDEN
|
||
| (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
|
||
|
||
if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
|
||
sym_hash, &old_bfd, &old_weak,
|
||
&old_alignment, &skip, &override,
|
||
&type_change_ok, &size_change_ok))
|
||
goto error_free_vers;
|
||
|
||
if (skip)
|
||
continue;
|
||
|
||
if (override)
|
||
definition = FALSE;
|
||
|
||
h = *sym_hash;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (elf_tdata (abfd)->verdef != NULL
|
||
&& vernum > 1
|
||
&& definition)
|
||
h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
|
||
}
|
||
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
|
||
(struct bfd_link_hash_entry **) sym_hash)))
|
||
goto error_free_vers;
|
||
|
||
h = *sym_hash;
|
||
/* We need to make sure that indirect symbol dynamic flags are
|
||
updated. */
|
||
hi = h;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
*sym_hash = h;
|
||
|
||
new_weak = (flags & BSF_WEAK) != 0;
|
||
new_weakdef = FALSE;
|
||
if (dynamic
|
||
&& definition
|
||
&& new_weak
|
||
&& !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
|
||
&& is_elf_hash_table (htab)
|
||
&& h->u.weakdef == NULL)
|
||
{
|
||
/* Keep a list of all weak defined non function symbols from
|
||
a dynamic object, using the weakdef field. Later in this
|
||
function we will set the weakdef field to the correct
|
||
value. We only put non-function symbols from dynamic
|
||
objects on this list, because that happens to be the only
|
||
time we need to know the normal symbol corresponding to a
|
||
weak symbol, and the information is time consuming to
|
||
figure out. If the weakdef field is not already NULL,
|
||
then this symbol was already defined by some previous
|
||
dynamic object, and we will be using that previous
|
||
definition anyhow. */
|
||
|
||
h->u.weakdef = weaks;
|
||
weaks = h;
|
||
new_weakdef = TRUE;
|
||
}
|
||
|
||
/* Set the alignment of a common symbol. */
|
||
if ((common || bfd_is_com_section (sec))
|
||
&& h->root.type == bfd_link_hash_common)
|
||
{
|
||
unsigned int align;
|
||
|
||
if (common)
|
||
align = bfd_log2 (isym->st_value);
|
||
else
|
||
{
|
||
/* The new symbol is a common symbol in a shared object.
|
||
We need to get the alignment from the section. */
|
||
align = new_sec->alignment_power;
|
||
}
|
||
if (align > old_alignment)
|
||
h->root.u.c.p->alignment_power = align;
|
||
else
|
||
h->root.u.c.p->alignment_power = old_alignment;
|
||
}
|
||
|
||
if (is_elf_hash_table (htab))
|
||
{
|
||
/* Set a flag in the hash table entry indicating the type of
|
||
reference or definition we just found. A dynamic symbol
|
||
is one which is referenced or defined by both a regular
|
||
object and a shared object. */
|
||
bfd_boolean dynsym = FALSE;
|
||
|
||
/* Plugin symbols aren't normal. Don't set def_regular or
|
||
ref_regular for them, or make them dynamic. */
|
||
if ((abfd->flags & BFD_PLUGIN) != 0)
|
||
;
|
||
else if (! dynamic)
|
||
{
|
||
if (! definition)
|
||
{
|
||
h->ref_regular = 1;
|
||
if (bind != STB_WEAK)
|
||
h->ref_regular_nonweak = 1;
|
||
}
|
||
else
|
||
{
|
||
h->def_regular = 1;
|
||
if (h->def_dynamic)
|
||
{
|
||
h->def_dynamic = 0;
|
||
h->ref_dynamic = 1;
|
||
}
|
||
}
|
||
|
||
/* If the indirect symbol has been forced local, don't
|
||
make the real symbol dynamic. */
|
||
if ((h == hi || !hi->forced_local)
|
||
&& (! info->executable
|
||
|| h->def_dynamic
|
||
|| h->ref_dynamic))
|
||
dynsym = TRUE;
|
||
}
|
||
else
|
||
{
|
||
if (! definition)
|
||
{
|
||
h->ref_dynamic = 1;
|
||
hi->ref_dynamic = 1;
|
||
}
|
||
else
|
||
{
|
||
h->def_dynamic = 1;
|
||
hi->def_dynamic = 1;
|
||
}
|
||
|
||
/* If the indirect symbol has been forced local, don't
|
||
make the real symbol dynamic. */
|
||
if ((h == hi || !hi->forced_local)
|
||
&& (h->def_regular
|
||
|| h->ref_regular
|
||
|| (h->u.weakdef != NULL
|
||
&& ! new_weakdef
|
||
&& h->u.weakdef->dynindx != -1)))
|
||
dynsym = TRUE;
|
||
}
|
||
|
||
/* Check to see if we need to add an indirect symbol for
|
||
the default name. */
|
||
if (definition
|
||
|| (!override && h->root.type == bfd_link_hash_common))
|
||
if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
|
||
sec, value, &old_bfd, &dynsym))
|
||
goto error_free_vers;
|
||
|
||
/* Check the alignment when a common symbol is involved. This
|
||
can change when a common symbol is overridden by a normal
|
||
definition or a common symbol is ignored due to the old
|
||
normal definition. We need to make sure the maximum
|
||
alignment is maintained. */
|
||
if ((old_alignment || common)
|
||
&& h->root.type != bfd_link_hash_common)
|
||
{
|
||
unsigned int common_align;
|
||
unsigned int normal_align;
|
||
unsigned int symbol_align;
|
||
bfd *normal_bfd;
|
||
bfd *common_bfd;
|
||
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak);
|
||
|
||
symbol_align = ffs (h->root.u.def.value) - 1;
|
||
if (h->root.u.def.section->owner != NULL
|
||
&& (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
|
||
{
|
||
normal_align = h->root.u.def.section->alignment_power;
|
||
if (normal_align > symbol_align)
|
||
normal_align = symbol_align;
|
||
}
|
||
else
|
||
normal_align = symbol_align;
|
||
|
||
if (old_alignment)
|
||
{
|
||
common_align = old_alignment;
|
||
common_bfd = old_bfd;
|
||
normal_bfd = abfd;
|
||
}
|
||
else
|
||
{
|
||
common_align = bfd_log2 (isym->st_value);
|
||
common_bfd = abfd;
|
||
normal_bfd = old_bfd;
|
||
}
|
||
|
||
if (normal_align < common_align)
|
||
{
|
||
/* PR binutils/2735 */
|
||
if (normal_bfd == NULL)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: alignment %u of common symbol `%s' in %B is"
|
||
" greater than the alignment (%u) of its section %A"),
|
||
common_bfd, h->root.u.def.section,
|
||
1 << common_align, name, 1 << normal_align);
|
||
else
|
||
(*_bfd_error_handler)
|
||
(_("Warning: alignment %u of symbol `%s' in %B"
|
||
" is smaller than %u in %B"),
|
||
normal_bfd, common_bfd,
|
||
1 << normal_align, name, 1 << common_align);
|
||
}
|
||
}
|
||
|
||
/* Remember the symbol size if it isn't undefined. */
|
||
if (isym->st_size != 0
|
||
&& isym->st_shndx != SHN_UNDEF
|
||
&& (definition || h->size == 0))
|
||
{
|
||
if (h->size != 0
|
||
&& h->size != isym->st_size
|
||
&& ! size_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: size of symbol `%s' changed"
|
||
" from %lu in %B to %lu in %B"),
|
||
old_bfd, abfd,
|
||
name, (unsigned long) h->size,
|
||
(unsigned long) isym->st_size);
|
||
|
||
h->size = isym->st_size;
|
||
}
|
||
|
||
/* If this is a common symbol, then we always want H->SIZE
|
||
to be the size of the common symbol. The code just above
|
||
won't fix the size if a common symbol becomes larger. We
|
||
don't warn about a size change here, because that is
|
||
covered by --warn-common. Allow changes between different
|
||
function types. */
|
||
if (h->root.type == bfd_link_hash_common)
|
||
h->size = h->root.u.c.size;
|
||
|
||
if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
|
||
&& ((definition && !new_weak)
|
||
|| (old_weak && h->root.type == bfd_link_hash_common)
|
||
|| h->type == STT_NOTYPE))
|
||
{
|
||
unsigned int type = ELF_ST_TYPE (isym->st_info);
|
||
|
||
/* Turn an IFUNC symbol from a DSO into a normal FUNC
|
||
symbol. */
|
||
if (type == STT_GNU_IFUNC
|
||
&& (abfd->flags & DYNAMIC) != 0)
|
||
type = STT_FUNC;
|
||
|
||
if (h->type != type)
|
||
{
|
||
if (h->type != STT_NOTYPE && ! type_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: type of symbol `%s' changed"
|
||
" from %d to %d in %B"),
|
||
abfd, name, h->type, type);
|
||
|
||
h->type = type;
|
||
}
|
||
}
|
||
|
||
/* Merge st_other field. */
|
||
elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
|
||
|
||
/* We don't want to make debug symbol dynamic. */
|
||
if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
|
||
dynsym = FALSE;
|
||
|
||
/* Nor should we make plugin symbols dynamic. */
|
||
if ((abfd->flags & BFD_PLUGIN) != 0)
|
||
dynsym = FALSE;
|
||
|
||
if (definition)
|
||
{
|
||
h->target_internal = isym->st_target_internal;
|
||
h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
|
||
}
|
||
|
||
if (definition && !dynamic)
|
||
{
|
||
char *p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL && p[1] != ELF_VER_CHR)
|
||
{
|
||
/* Queue non-default versions so that .symver x, x@FOO
|
||
aliases can be checked. */
|
||
if (!nondeflt_vers)
|
||
{
|
||
amt = ((isymend - isym + 1)
|
||
* sizeof (struct elf_link_hash_entry *));
|
||
nondeflt_vers
|
||
= (struct elf_link_hash_entry **) bfd_malloc (amt);
|
||
if (!nondeflt_vers)
|
||
goto error_free_vers;
|
||
}
|
||
nondeflt_vers[nondeflt_vers_cnt++] = h;
|
||
}
|
||
}
|
||
|
||
if (dynsym && h->dynindx == -1)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
goto error_free_vers;
|
||
if (h->u.weakdef != NULL
|
||
&& ! new_weakdef
|
||
&& h->u.weakdef->dynindx == -1)
|
||
{
|
||
if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
else if (dynsym && h->dynindx != -1)
|
||
/* If the symbol already has a dynamic index, but
|
||
visibility says it should not be visible, turn it into
|
||
a local symbol. */
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_INTERNAL:
|
||
case STV_HIDDEN:
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
dynsym = FALSE;
|
||
break;
|
||
}
|
||
|
||
/* Don't add DT_NEEDED for references from the dummy bfd. */
|
||
if (!add_needed
|
||
&& definition
|
||
&& ((dynsym
|
||
&& h->ref_regular_nonweak
|
||
&& (old_bfd == NULL
|
||
|| (old_bfd->flags & BFD_PLUGIN) == 0))
|
||
|| (h->ref_dynamic_nonweak
|
||
&& (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
|
||
&& !on_needed_list (elf_dt_name (abfd), htab->needed))))
|
||
{
|
||
int ret;
|
||
const char *soname = elf_dt_name (abfd);
|
||
|
||
info->callbacks->minfo ("%!", soname, old_bfd,
|
||
h->root.root.string);
|
||
|
||
/* A symbol from a library loaded via DT_NEEDED of some
|
||
other library is referenced by a regular object.
|
||
Add a DT_NEEDED entry for it. Issue an error if
|
||
--no-add-needed is used and the reference was not
|
||
a weak one. */
|
||
if (old_bfd != NULL
|
||
&& (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: undefined reference to symbol '%s'"),
|
||
old_bfd, name);
|
||
bfd_set_error (bfd_error_missing_dso);
|
||
goto error_free_vers;
|
||
}
|
||
|
||
elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
|
||
(elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
|
||
|
||
add_needed = TRUE;
|
||
ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
|
||
if (ret < 0)
|
||
goto error_free_vers;
|
||
|
||
BFD_ASSERT (ret == 0);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (extversym != NULL)
|
||
{
|
||
free (extversym);
|
||
extversym = NULL;
|
||
}
|
||
|
||
if (isymbuf != NULL)
|
||
{
|
||
free (isymbuf);
|
||
isymbuf = NULL;
|
||
}
|
||
|
||
if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
|
||
{
|
||
unsigned int i;
|
||
|
||
/* Restore the symbol table. */
|
||
old_ent = (char *) old_tab + tabsize;
|
||
memset (elf_sym_hashes (abfd), 0,
|
||
extsymcount * sizeof (struct elf_link_hash_entry *));
|
||
htab->root.table.table = old_table;
|
||
htab->root.table.size = old_size;
|
||
htab->root.table.count = old_count;
|
||
memcpy (htab->root.table.table, old_tab, tabsize);
|
||
htab->root.undefs = old_undefs;
|
||
htab->root.undefs_tail = old_undefs_tail;
|
||
_bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
|
||
for (i = 0; i < htab->root.table.size; i++)
|
||
{
|
||
struct bfd_hash_entry *p;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_size_type size;
|
||
unsigned int alignment_power;
|
||
|
||
for (p = htab->root.table.table[i]; p != NULL; p = p->next)
|
||
{
|
||
h = (struct elf_link_hash_entry *) p;
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
if (h->dynindx >= old_dynsymcount
|
||
&& h->dynstr_index < old_dynstr_size)
|
||
_bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
|
||
|
||
/* Preserve the maximum alignment and size for common
|
||
symbols even if this dynamic lib isn't on DT_NEEDED
|
||
since it can still be loaded at run time by another
|
||
dynamic lib. */
|
||
if (h->root.type == bfd_link_hash_common)
|
||
{
|
||
size = h->root.u.c.size;
|
||
alignment_power = h->root.u.c.p->alignment_power;
|
||
}
|
||
else
|
||
{
|
||
size = 0;
|
||
alignment_power = 0;
|
||
}
|
||
memcpy (p, old_ent, htab->root.table.entsize);
|
||
old_ent = (char *) old_ent + htab->root.table.entsize;
|
||
h = (struct elf_link_hash_entry *) p;
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
{
|
||
memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
|
||
old_ent = (char *) old_ent + htab->root.table.entsize;
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
}
|
||
if (h->root.type == bfd_link_hash_common)
|
||
{
|
||
if (size > h->root.u.c.size)
|
||
h->root.u.c.size = size;
|
||
if (alignment_power > h->root.u.c.p->alignment_power)
|
||
h->root.u.c.p->alignment_power = alignment_power;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Make a special call to the linker "notice" function to
|
||
tell it that symbols added for crefs may need to be removed. */
|
||
if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
|
||
goto error_free_vers;
|
||
|
||
free (old_tab);
|
||
objalloc_free_block ((struct objalloc *) htab->root.table.memory,
|
||
alloc_mark);
|
||
if (nondeflt_vers != NULL)
|
||
free (nondeflt_vers);
|
||
return TRUE;
|
||
}
|
||
|
||
if (old_tab != NULL)
|
||
{
|
||
if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
|
||
goto error_free_vers;
|
||
free (old_tab);
|
||
old_tab = NULL;
|
||
}
|
||
|
||
/* Now that all the symbols from this input file are created, handle
|
||
.symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
|
||
if (nondeflt_vers != NULL)
|
||
{
|
||
bfd_size_type cnt, symidx;
|
||
|
||
for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
|
||
{
|
||
struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
|
||
char *shortname, *p;
|
||
|
||
p = strchr (h->root.root.string, ELF_VER_CHR);
|
||
if (p == NULL
|
||
|| (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak))
|
||
continue;
|
||
|
||
amt = p - h->root.root.string;
|
||
shortname = (char *) bfd_malloc (amt + 1);
|
||
if (!shortname)
|
||
goto error_free_vers;
|
||
memcpy (shortname, h->root.root.string, amt);
|
||
shortname[amt] = '\0';
|
||
|
||
hi = (struct elf_link_hash_entry *)
|
||
bfd_link_hash_lookup (&htab->root, shortname,
|
||
FALSE, FALSE, FALSE);
|
||
if (hi != NULL
|
||
&& hi->root.type == h->root.type
|
||
&& hi->root.u.def.value == h->root.u.def.value
|
||
&& hi->root.u.def.section == h->root.u.def.section)
|
||
{
|
||
(*bed->elf_backend_hide_symbol) (info, hi, TRUE);
|
||
hi->root.type = bfd_link_hash_indirect;
|
||
hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
|
||
(*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
|
||
sym_hash = elf_sym_hashes (abfd);
|
||
if (sym_hash)
|
||
for (symidx = 0; symidx < extsymcount; ++symidx)
|
||
if (sym_hash[symidx] == hi)
|
||
{
|
||
sym_hash[symidx] = h;
|
||
break;
|
||
}
|
||
}
|
||
free (shortname);
|
||
}
|
||
free (nondeflt_vers);
|
||
nondeflt_vers = NULL;
|
||
}
|
||
|
||
/* Now set the weakdefs field correctly for all the weak defined
|
||
symbols we found. The only way to do this is to search all the
|
||
symbols. Since we only need the information for non functions in
|
||
dynamic objects, that's the only time we actually put anything on
|
||
the list WEAKS. We need this information so that if a regular
|
||
object refers to a symbol defined weakly in a dynamic object, the
|
||
real symbol in the dynamic object is also put in the dynamic
|
||
symbols; we also must arrange for both symbols to point to the
|
||
same memory location. We could handle the general case of symbol
|
||
aliasing, but a general symbol alias can only be generated in
|
||
assembler code, handling it correctly would be very time
|
||
consuming, and other ELF linkers don't handle general aliasing
|
||
either. */
|
||
if (weaks != NULL)
|
||
{
|
||
struct elf_link_hash_entry **hpp;
|
||
struct elf_link_hash_entry **hppend;
|
||
struct elf_link_hash_entry **sorted_sym_hash;
|
||
struct elf_link_hash_entry *h;
|
||
size_t sym_count;
|
||
|
||
/* Since we have to search the whole symbol list for each weak
|
||
defined symbol, search time for N weak defined symbols will be
|
||
O(N^2). Binary search will cut it down to O(NlogN). */
|
||
amt = extsymcount * sizeof (struct elf_link_hash_entry *);
|
||
sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
|
||
if (sorted_sym_hash == NULL)
|
||
goto error_return;
|
||
sym_hash = sorted_sym_hash;
|
||
hpp = elf_sym_hashes (abfd);
|
||
hppend = hpp + extsymcount;
|
||
sym_count = 0;
|
||
for (; hpp < hppend; hpp++)
|
||
{
|
||
h = *hpp;
|
||
if (h != NULL
|
||
&& h->root.type == bfd_link_hash_defined
|
||
&& !bed->is_function_type (h->type))
|
||
{
|
||
*sym_hash = h;
|
||
sym_hash++;
|
||
sym_count++;
|
||
}
|
||
}
|
||
|
||
qsort (sorted_sym_hash, sym_count,
|
||
sizeof (struct elf_link_hash_entry *),
|
||
elf_sort_symbol);
|
||
|
||
while (weaks != NULL)
|
||
{
|
||
struct elf_link_hash_entry *hlook;
|
||
asection *slook;
|
||
bfd_vma vlook;
|
||
size_t i, j, idx = 0;
|
||
|
||
hlook = weaks;
|
||
weaks = hlook->u.weakdef;
|
||
hlook->u.weakdef = NULL;
|
||
|
||
BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
|
||
|| hlook->root.type == bfd_link_hash_defweak
|
||
|| hlook->root.type == bfd_link_hash_common
|
||
|| hlook->root.type == bfd_link_hash_indirect);
|
||
slook = hlook->root.u.def.section;
|
||
vlook = hlook->root.u.def.value;
|
||
|
||
i = 0;
|
||
j = sym_count;
|
||
while (i != j)
|
||
{
|
||
bfd_signed_vma vdiff;
|
||
idx = (i + j) / 2;
|
||
h = sorted_sym_hash[idx];
|
||
vdiff = vlook - h->root.u.def.value;
|
||
if (vdiff < 0)
|
||
j = idx;
|
||
else if (vdiff > 0)
|
||
i = idx + 1;
|
||
else
|
||
{
|
||
long sdiff = slook->id - h->root.u.def.section->id;
|
||
if (sdiff < 0)
|
||
j = idx;
|
||
else if (sdiff > 0)
|
||
i = idx + 1;
|
||
else
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* We didn't find a value/section match. */
|
||
if (i == j)
|
||
continue;
|
||
|
||
/* With multiple aliases, or when the weak symbol is already
|
||
strongly defined, we have multiple matching symbols and
|
||
the binary search above may land on any of them. Step
|
||
one past the matching symbol(s). */
|
||
while (++idx != j)
|
||
{
|
||
h = sorted_sym_hash[idx];
|
||
if (h->root.u.def.section != slook
|
||
|| h->root.u.def.value != vlook)
|
||
break;
|
||
}
|
||
|
||
/* Now look back over the aliases. Since we sorted by size
|
||
as well as value and section, we'll choose the one with
|
||
the largest size. */
|
||
while (idx-- != i)
|
||
{
|
||
h = sorted_sym_hash[idx];
|
||
|
||
/* Stop if value or section doesn't match. */
|
||
if (h->root.u.def.section != slook
|
||
|| h->root.u.def.value != vlook)
|
||
break;
|
||
else if (h != hlook)
|
||
{
|
||
hlook->u.weakdef = h;
|
||
|
||
/* If the weak definition is in the list of dynamic
|
||
symbols, make sure the real definition is put
|
||
there as well. */
|
||
if (hlook->dynindx != -1 && h->dynindx == -1)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
{
|
||
err_free_sym_hash:
|
||
free (sorted_sym_hash);
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* If the real definition is in the list of dynamic
|
||
symbols, make sure the weak definition is put
|
||
there as well. If we don't do this, then the
|
||
dynamic loader might not merge the entries for the
|
||
real definition and the weak definition. */
|
||
if (h->dynindx != -1 && hlook->dynindx == -1)
|
||
{
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
|
||
goto err_free_sym_hash;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
free (sorted_sym_hash);
|
||
}
|
||
|
||
if (bed->check_directives
|
||
&& !(*bed->check_directives) (abfd, info))
|
||
return FALSE;
|
||
|
||
/* If this object is the same format as the output object, and it is
|
||
not a shared library, then let the backend look through the
|
||
relocs.
|
||
|
||
This is required to build global offset table entries and to
|
||
arrange for dynamic relocs. It is not required for the
|
||
particular common case of linking non PIC code, even when linking
|
||
against shared libraries, but unfortunately there is no way of
|
||
knowing whether an object file has been compiled PIC or not.
|
||
Looking through the relocs is not particularly time consuming.
|
||
The problem is that we must either (1) keep the relocs in memory,
|
||
which causes the linker to require additional runtime memory or
|
||
(2) read the relocs twice from the input file, which wastes time.
|
||
This would be a good case for using mmap.
|
||
|
||
I have no idea how to handle linking PIC code into a file of a
|
||
different format. It probably can't be done. */
|
||
if (! dynamic
|
||
&& is_elf_hash_table (htab)
|
||
&& bed->check_relocs != NULL
|
||
&& elf_object_id (abfd) == elf_hash_table_id (htab)
|
||
&& (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
|
||
{
|
||
asection *o;
|
||
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
bfd_boolean ok;
|
||
|
||
if ((o->flags & SEC_RELOC) == 0
|
||
|| o->reloc_count == 0
|
||
|| ((info->strip == strip_all || info->strip == strip_debugger)
|
||
&& (o->flags & SEC_DEBUGGING) != 0)
|
||
|| bfd_is_abs_section (o->output_section))
|
||
continue;
|
||
|
||
internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
|
||
info->keep_memory);
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
|
||
ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
|
||
|
||
if (elf_section_data (o)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
if (! ok)
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* If this is a non-traditional link, try to optimize the handling
|
||
of the .stab/.stabstr sections. */
|
||
if (! dynamic
|
||
&& ! info->traditional_format
|
||
&& is_elf_hash_table (htab)
|
||
&& (info->strip != strip_all && info->strip != strip_debugger))
|
||
{
|
||
asection *stabstr;
|
||
|
||
stabstr = bfd_get_section_by_name (abfd, ".stabstr");
|
||
if (stabstr != NULL)
|
||
{
|
||
bfd_size_type string_offset = 0;
|
||
asection *stab;
|
||
|
||
for (stab = abfd->sections; stab; stab = stab->next)
|
||
if (CONST_STRNEQ (stab->name, ".stab")
|
||
&& (!stab->name[5] ||
|
||
(stab->name[5] == '.' && ISDIGIT (stab->name[6])))
|
||
&& (stab->flags & SEC_MERGE) == 0
|
||
&& !bfd_is_abs_section (stab->output_section))
|
||
{
|
||
struct bfd_elf_section_data *secdata;
|
||
|
||
secdata = elf_section_data (stab);
|
||
if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
|
||
stabstr, &secdata->sec_info,
|
||
&string_offset))
|
||
goto error_return;
|
||
if (secdata->sec_info)
|
||
stab->sec_info_type = SEC_INFO_TYPE_STABS;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (is_elf_hash_table (htab) && add_needed)
|
||
{
|
||
/* Add this bfd to the loaded list. */
|
||
struct elf_link_loaded_list *n;
|
||
|
||
n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
|
||
if (n == NULL)
|
||
goto error_return;
|
||
n->abfd = abfd;
|
||
n->next = htab->loaded;
|
||
htab->loaded = n;
|
||
}
|
||
|
||
return TRUE;
|
||
|
||
error_free_vers:
|
||
if (old_tab != NULL)
|
||
free (old_tab);
|
||
if (nondeflt_vers != NULL)
|
||
free (nondeflt_vers);
|
||
if (extversym != NULL)
|
||
free (extversym);
|
||
error_free_sym:
|
||
if (isymbuf != NULL)
|
||
free (isymbuf);
|
||
error_return:
|
||
return FALSE;
|
||
}
|
||
|
||
/* Return the linker hash table entry of a symbol that might be
|
||
satisfied by an archive symbol. Return -1 on error. */
|
||
|
||
struct elf_link_hash_entry *
|
||
_bfd_elf_archive_symbol_lookup (bfd *abfd,
|
||
struct bfd_link_info *info,
|
||
const char *name)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
char *p, *copy;
|
||
size_t len, first;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
|
||
if (h != NULL)
|
||
return h;
|
||
|
||
/* If this is a default version (the name contains @@), look up the
|
||
symbol again with only one `@' as well as without the version.
|
||
The effect is that references to the symbol with and without the
|
||
version will be matched by the default symbol in the archive. */
|
||
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p == NULL || p[1] != ELF_VER_CHR)
|
||
return h;
|
||
|
||
/* First check with only one `@'. */
|
||
len = strlen (name);
|
||
copy = (char *) bfd_alloc (abfd, len);
|
||
if (copy == NULL)
|
||
return (struct elf_link_hash_entry *) 0 - 1;
|
||
|
||
first = p - name + 1;
|
||
memcpy (copy, name, first);
|
||
memcpy (copy + first, name + first + 1, len - first);
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
|
||
if (h == NULL)
|
||
{
|
||
/* We also need to check references to the symbol without the
|
||
version. */
|
||
copy[first - 1] = '\0';
|
||
h = elf_link_hash_lookup (elf_hash_table (info), copy,
|
||
FALSE, FALSE, TRUE);
|
||
}
|
||
|
||
bfd_release (abfd, copy);
|
||
return h;
|
||
}
|
||
|
||
/* Add symbols from an ELF archive file to the linker hash table. We
|
||
don't use _bfd_generic_link_add_archive_symbols because we need to
|
||
handle versioned symbols.
|
||
|
||
Fortunately, ELF archive handling is simpler than that done by
|
||
_bfd_generic_link_add_archive_symbols, which has to allow for a.out
|
||
oddities. In ELF, if we find a symbol in the archive map, and the
|
||
symbol is currently undefined, we know that we must pull in that
|
||
object file.
|
||
|
||
Unfortunately, we do have to make multiple passes over the symbol
|
||
table until nothing further is resolved. */
|
||
|
||
static bfd_boolean
|
||
elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
symindex c;
|
||
unsigned char *included = NULL;
|
||
carsym *symdefs;
|
||
bfd_boolean loop;
|
||
bfd_size_type amt;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_link_hash_entry * (*archive_symbol_lookup)
|
||
(bfd *, struct bfd_link_info *, const char *);
|
||
|
||
if (! bfd_has_map (abfd))
|
||
{
|
||
/* An empty archive is a special case. */
|
||
if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
|
||
return TRUE;
|
||
bfd_set_error (bfd_error_no_armap);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Keep track of all symbols we know to be already defined, and all
|
||
files we know to be already included. This is to speed up the
|
||
second and subsequent passes. */
|
||
c = bfd_ardata (abfd)->symdef_count;
|
||
if (c == 0)
|
||
return TRUE;
|
||
amt = c;
|
||
amt *= sizeof (*included);
|
||
included = (unsigned char *) bfd_zmalloc (amt);
|
||
if (included == NULL)
|
||
return FALSE;
|
||
|
||
symdefs = bfd_ardata (abfd)->symdefs;
|
||
bed = get_elf_backend_data (abfd);
|
||
archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
|
||
|
||
do
|
||
{
|
||
file_ptr last;
|
||
symindex i;
|
||
carsym *symdef;
|
||
carsym *symdefend;
|
||
|
||
loop = FALSE;
|
||
last = -1;
|
||
|
||
symdef = symdefs;
|
||
symdefend = symdef + c;
|
||
for (i = 0; symdef < symdefend; symdef++, i++)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
bfd *element;
|
||
struct bfd_link_hash_entry *undefs_tail;
|
||
symindex mark;
|
||
|
||
if (included[i])
|
||
continue;
|
||
if (symdef->file_offset == last)
|
||
{
|
||
included[i] = TRUE;
|
||
continue;
|
||
}
|
||
|
||
h = archive_symbol_lookup (abfd, info, symdef->name);
|
||
if (h == (struct elf_link_hash_entry *) 0 - 1)
|
||
goto error_return;
|
||
|
||
if (h == NULL)
|
||
continue;
|
||
|
||
if (h->root.type == bfd_link_hash_common)
|
||
{
|
||
/* We currently have a common symbol. The archive map contains
|
||
a reference to this symbol, so we may want to include it. We
|
||
only want to include it however, if this archive element
|
||
contains a definition of the symbol, not just another common
|
||
declaration of it.
|
||
|
||
Unfortunately some archivers (including GNU ar) will put
|
||
declarations of common symbols into their archive maps, as
|
||
well as real definitions, so we cannot just go by the archive
|
||
map alone. Instead we must read in the element's symbol
|
||
table and check that to see what kind of symbol definition
|
||
this is. */
|
||
if (! elf_link_is_defined_archive_symbol (abfd, symdef))
|
||
continue;
|
||
}
|
||
else if (h->root.type != bfd_link_hash_undefined)
|
||
{
|
||
if (h->root.type != bfd_link_hash_undefweak)
|
||
/* Symbol must be defined. Don't check it again. */
|
||
included[i] = TRUE;
|
||
continue;
|
||
}
|
||
|
||
/* We need to include this archive member. */
|
||
element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
|
||
if (element == NULL)
|
||
goto error_return;
|
||
|
||
if (! bfd_check_format (element, bfd_object))
|
||
goto error_return;
|
||
|
||
undefs_tail = info->hash->undefs_tail;
|
||
|
||
if (!(*info->callbacks
|
||
->add_archive_element) (info, element, symdef->name, &element))
|
||
goto error_return;
|
||
if (!bfd_link_add_symbols (element, info))
|
||
goto error_return;
|
||
|
||
/* If there are any new undefined symbols, we need to make
|
||
another pass through the archive in order to see whether
|
||
they can be defined. FIXME: This isn't perfect, because
|
||
common symbols wind up on undefs_tail and because an
|
||
undefined symbol which is defined later on in this pass
|
||
does not require another pass. This isn't a bug, but it
|
||
does make the code less efficient than it could be. */
|
||
if (undefs_tail != info->hash->undefs_tail)
|
||
loop = TRUE;
|
||
|
||
/* Look backward to mark all symbols from this object file
|
||
which we have already seen in this pass. */
|
||
mark = i;
|
||
do
|
||
{
|
||
included[mark] = TRUE;
|
||
if (mark == 0)
|
||
break;
|
||
--mark;
|
||
}
|
||
while (symdefs[mark].file_offset == symdef->file_offset);
|
||
|
||
/* We mark subsequent symbols from this object file as we go
|
||
on through the loop. */
|
||
last = symdef->file_offset;
|
||
}
|
||
}
|
||
while (loop);
|
||
|
||
free (included);
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (included != NULL)
|
||
free (included);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Given an ELF BFD, add symbols to the global hash table as
|
||
appropriate. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
switch (bfd_get_format (abfd))
|
||
{
|
||
case bfd_object:
|
||
return elf_link_add_object_symbols (abfd, info);
|
||
case bfd_archive:
|
||
return elf_link_add_archive_symbols (abfd, info);
|
||
default:
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
struct hash_codes_info
|
||
{
|
||
unsigned long *hashcodes;
|
||
bfd_boolean error;
|
||
};
|
||
|
||
/* This function will be called though elf_link_hash_traverse to store
|
||
all hash value of the exported symbols in an array. */
|
||
|
||
static bfd_boolean
|
||
elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct hash_codes_info *inf = (struct hash_codes_info *) data;
|
||
const char *name;
|
||
char *p;
|
||
unsigned long ha;
|
||
char *alc = NULL;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->dynindx == -1)
|
||
return TRUE;
|
||
|
||
name = h->root.root.string;
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL)
|
||
{
|
||
alc = (char *) bfd_malloc (p - name + 1);
|
||
if (alc == NULL)
|
||
{
|
||
inf->error = TRUE;
|
||
return FALSE;
|
||
}
|
||
memcpy (alc, name, p - name);
|
||
alc[p - name] = '\0';
|
||
name = alc;
|
||
}
|
||
|
||
/* Compute the hash value. */
|
||
ha = bfd_elf_hash (name);
|
||
|
||
/* Store the found hash value in the array given as the argument. */
|
||
*(inf->hashcodes)++ = ha;
|
||
|
||
/* And store it in the struct so that we can put it in the hash table
|
||
later. */
|
||
h->u.elf_hash_value = ha;
|
||
|
||
if (alc != NULL)
|
||
free (alc);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
struct collect_gnu_hash_codes
|
||
{
|
||
bfd *output_bfd;
|
||
const struct elf_backend_data *bed;
|
||
unsigned long int nsyms;
|
||
unsigned long int maskbits;
|
||
unsigned long int *hashcodes;
|
||
unsigned long int *hashval;
|
||
unsigned long int *indx;
|
||
unsigned long int *counts;
|
||
bfd_vma *bitmask;
|
||
bfd_byte *contents;
|
||
long int min_dynindx;
|
||
unsigned long int bucketcount;
|
||
unsigned long int symindx;
|
||
long int local_indx;
|
||
long int shift1, shift2;
|
||
unsigned long int mask;
|
||
bfd_boolean error;
|
||
};
|
||
|
||
/* This function will be called though elf_link_hash_traverse to store
|
||
all hash value of the exported symbols in an array. */
|
||
|
||
static bfd_boolean
|
||
elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
|
||
const char *name;
|
||
char *p;
|
||
unsigned long ha;
|
||
char *alc = NULL;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->dynindx == -1)
|
||
return TRUE;
|
||
|
||
/* Ignore also local symbols and undefined symbols. */
|
||
if (! (*s->bed->elf_hash_symbol) (h))
|
||
return TRUE;
|
||
|
||
name = h->root.root.string;
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL)
|
||
{
|
||
alc = (char *) bfd_malloc (p - name + 1);
|
||
if (alc == NULL)
|
||
{
|
||
s->error = TRUE;
|
||
return FALSE;
|
||
}
|
||
memcpy (alc, name, p - name);
|
||
alc[p - name] = '\0';
|
||
name = alc;
|
||
}
|
||
|
||
/* Compute the hash value. */
|
||
ha = bfd_elf_gnu_hash (name);
|
||
|
||
/* Store the found hash value in the array for compute_bucket_count,
|
||
and also for .dynsym reordering purposes. */
|
||
s->hashcodes[s->nsyms] = ha;
|
||
s->hashval[h->dynindx] = ha;
|
||
++s->nsyms;
|
||
if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
|
||
s->min_dynindx = h->dynindx;
|
||
|
||
if (alc != NULL)
|
||
free (alc);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* This function will be called though elf_link_hash_traverse to do
|
||
final dynaminc symbol renumbering. */
|
||
|
||
static bfd_boolean
|
||
elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
|
||
unsigned long int bucket;
|
||
unsigned long int val;
|
||
|
||
/* Ignore indirect symbols. */
|
||
if (h->dynindx == -1)
|
||
return TRUE;
|
||
|
||
/* Ignore also local symbols and undefined symbols. */
|
||
if (! (*s->bed->elf_hash_symbol) (h))
|
||
{
|
||
if (h->dynindx >= s->min_dynindx)
|
||
h->dynindx = s->local_indx++;
|
||
return TRUE;
|
||
}
|
||
|
||
bucket = s->hashval[h->dynindx] % s->bucketcount;
|
||
val = (s->hashval[h->dynindx] >> s->shift1)
|
||
& ((s->maskbits >> s->shift1) - 1);
|
||
s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
|
||
s->bitmask[val]
|
||
|= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
|
||
val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
|
||
if (s->counts[bucket] == 1)
|
||
/* Last element terminates the chain. */
|
||
val |= 1;
|
||
bfd_put_32 (s->output_bfd, val,
|
||
s->contents + (s->indx[bucket] - s->symindx) * 4);
|
||
--s->counts[bucket];
|
||
h->dynindx = s->indx[bucket]++;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
|
||
{
|
||
return !(h->forced_local
|
||
|| h->root.type == bfd_link_hash_undefined
|
||
|| h->root.type == bfd_link_hash_undefweak
|
||
|| ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& h->root.u.def.section->output_section == NULL));
|
||
}
|
||
|
||
/* Array used to determine the number of hash table buckets to use
|
||
based on the number of symbols there are. If there are fewer than
|
||
3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
|
||
fewer than 37 we use 17 buckets, and so forth. We never use more
|
||
than 32771 buckets. */
|
||
|
||
static const size_t elf_buckets[] =
|
||
{
|
||
1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
|
||
16411, 32771, 0
|
||
};
|
||
|
||
/* Compute bucket count for hashing table. We do not use a static set
|
||
of possible tables sizes anymore. Instead we determine for all
|
||
possible reasonable sizes of the table the outcome (i.e., the
|
||
number of collisions etc) and choose the best solution. The
|
||
weighting functions are not too simple to allow the table to grow
|
||
without bounds. Instead one of the weighting factors is the size.
|
||
Therefore the result is always a good payoff between few collisions
|
||
(= short chain lengths) and table size. */
|
||
static size_t
|
||
compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
|
||
unsigned long int *hashcodes ATTRIBUTE_UNUSED,
|
||
unsigned long int nsyms,
|
||
int gnu_hash)
|
||
{
|
||
size_t best_size = 0;
|
||
unsigned long int i;
|
||
|
||
/* We have a problem here. The following code to optimize the table
|
||
size requires an integer type with more the 32 bits. If
|
||
BFD_HOST_U_64_BIT is set we know about such a type. */
|
||
#ifdef BFD_HOST_U_64_BIT
|
||
if (info->optimize)
|
||
{
|
||
size_t minsize;
|
||
size_t maxsize;
|
||
BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
size_t dynsymcount = elf_hash_table (info)->dynsymcount;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
|
||
unsigned long int *counts;
|
||
bfd_size_type amt;
|
||
unsigned int no_improvement_count = 0;
|
||
|
||
/* Possible optimization parameters: if we have NSYMS symbols we say
|
||
that the hashing table must at least have NSYMS/4 and at most
|
||
2*NSYMS buckets. */
|
||
minsize = nsyms / 4;
|
||
if (minsize == 0)
|
||
minsize = 1;
|
||
best_size = maxsize = nsyms * 2;
|
||
if (gnu_hash)
|
||
{
|
||
if (minsize < 2)
|
||
minsize = 2;
|
||
if ((best_size & 31) == 0)
|
||
++best_size;
|
||
}
|
||
|
||
/* Create array where we count the collisions in. We must use bfd_malloc
|
||
since the size could be large. */
|
||
amt = maxsize;
|
||
amt *= sizeof (unsigned long int);
|
||
counts = (unsigned long int *) bfd_malloc (amt);
|
||
if (counts == NULL)
|
||
return 0;
|
||
|
||
/* Compute the "optimal" size for the hash table. The criteria is a
|
||
minimal chain length. The minor criteria is (of course) the size
|
||
of the table. */
|
||
for (i = minsize; i < maxsize; ++i)
|
||
{
|
||
/* Walk through the array of hashcodes and count the collisions. */
|
||
BFD_HOST_U_64_BIT max;
|
||
unsigned long int j;
|
||
unsigned long int fact;
|
||
|
||
if (gnu_hash && (i & 31) == 0)
|
||
continue;
|
||
|
||
memset (counts, '\0', i * sizeof (unsigned long int));
|
||
|
||
/* Determine how often each hash bucket is used. */
|
||
for (j = 0; j < nsyms; ++j)
|
||
++counts[hashcodes[j] % i];
|
||
|
||
/* For the weight function we need some information about the
|
||
pagesize on the target. This is information need not be 100%
|
||
accurate. Since this information is not available (so far) we
|
||
define it here to a reasonable default value. If it is crucial
|
||
to have a better value some day simply define this value. */
|
||
# ifndef BFD_TARGET_PAGESIZE
|
||
# define BFD_TARGET_PAGESIZE (4096)
|
||
# endif
|
||
|
||
/* We in any case need 2 + DYNSYMCOUNT entries for the size values
|
||
and the chains. */
|
||
max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
|
||
|
||
# if 1
|
||
/* Variant 1: optimize for short chains. We add the squares
|
||
of all the chain lengths (which favors many small chain
|
||
over a few long chains). */
|
||
for (j = 0; j < i; ++j)
|
||
max += counts[j] * counts[j];
|
||
|
||
/* This adds penalties for the overall size of the table. */
|
||
fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
|
||
max *= fact * fact;
|
||
# else
|
||
/* Variant 2: Optimize a lot more for small table. Here we
|
||
also add squares of the size but we also add penalties for
|
||
empty slots (the +1 term). */
|
||
for (j = 0; j < i; ++j)
|
||
max += (1 + counts[j]) * (1 + counts[j]);
|
||
|
||
/* The overall size of the table is considered, but not as
|
||
strong as in variant 1, where it is squared. */
|
||
fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
|
||
max *= fact;
|
||
# endif
|
||
|
||
/* Compare with current best results. */
|
||
if (max < best_chlen)
|
||
{
|
||
best_chlen = max;
|
||
best_size = i;
|
||
no_improvement_count = 0;
|
||
}
|
||
/* PR 11843: Avoid futile long searches for the best bucket size
|
||
when there are a large number of symbols. */
|
||
else if (++no_improvement_count == 100)
|
||
break;
|
||
}
|
||
|
||
free (counts);
|
||
}
|
||
else
|
||
#endif /* defined (BFD_HOST_U_64_BIT) */
|
||
{
|
||
/* This is the fallback solution if no 64bit type is available or if we
|
||
are not supposed to spend much time on optimizations. We select the
|
||
bucket count using a fixed set of numbers. */
|
||
for (i = 0; elf_buckets[i] != 0; i++)
|
||
{
|
||
best_size = elf_buckets[i];
|
||
if (nsyms < elf_buckets[i + 1])
|
||
break;
|
||
}
|
||
if (gnu_hash && best_size < 2)
|
||
best_size = 2;
|
||
}
|
||
|
||
return best_size;
|
||
}
|
||
|
||
/* Size any SHT_GROUP section for ld -r. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_size_group_sections (struct bfd_link_info *info)
|
||
{
|
||
bfd *ibfd;
|
||
|
||
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
|
||
if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
|
||
&& !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
|
||
return FALSE;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Set a default stack segment size. The value in INFO wins. If it
|
||
is unset, LEGACY_SYMBOL's value is used, and if that symbol is
|
||
undefined it is initialized. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_stack_segment_size (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
const char *legacy_symbol,
|
||
bfd_vma default_size)
|
||
{
|
||
struct elf_link_hash_entry *h = NULL;
|
||
|
||
/* Look for legacy symbol. */
|
||
if (legacy_symbol)
|
||
h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
|
||
FALSE, FALSE, FALSE);
|
||
if (h && (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& h->def_regular
|
||
&& (h->type == STT_NOTYPE || h->type == STT_OBJECT))
|
||
{
|
||
/* The symbol has no type if specified on the command line. */
|
||
h->type = STT_OBJECT;
|
||
if (info->stacksize)
|
||
(*_bfd_error_handler) (_("%B: stack size specified and %s set"),
|
||
output_bfd, legacy_symbol);
|
||
else if (h->root.u.def.section != bfd_abs_section_ptr)
|
||
(*_bfd_error_handler) (_("%B: %s not absolute"),
|
||
output_bfd, legacy_symbol);
|
||
else
|
||
info->stacksize = h->root.u.def.value;
|
||
}
|
||
|
||
if (!info->stacksize)
|
||
/* If the user didn't set a size, or explicitly inhibit the
|
||
size, set it now. */
|
||
info->stacksize = default_size;
|
||
|
||
/* Provide the legacy symbol, if it is referenced. */
|
||
if (h && (h->root.type == bfd_link_hash_undefined
|
||
|| h->root.type == bfd_link_hash_undefweak))
|
||
{
|
||
struct bfd_link_hash_entry *bh = NULL;
|
||
|
||
if (!(_bfd_generic_link_add_one_symbol
|
||
(info, output_bfd, legacy_symbol,
|
||
BSF_GLOBAL, bfd_abs_section_ptr,
|
||
info->stacksize >= 0 ? info->stacksize : 0,
|
||
NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
|
||
return FALSE;
|
||
|
||
h = (struct elf_link_hash_entry *) bh;
|
||
h->def_regular = 1;
|
||
h->type = STT_OBJECT;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Set up the sizes and contents of the ELF dynamic sections. This is
|
||
called by the ELF linker emulation before_allocation routine. We
|
||
must set the sizes of the sections before the linker sets the
|
||
addresses of the various sections. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_size_dynamic_sections (bfd *output_bfd,
|
||
const char *soname,
|
||
const char *rpath,
|
||
const char *filter_shlib,
|
||
const char *audit,
|
||
const char *depaudit,
|
||
const char * const *auxiliary_filters,
|
||
struct bfd_link_info *info,
|
||
asection **sinterpptr)
|
||
{
|
||
bfd_size_type soname_indx;
|
||
bfd *dynobj;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_info_failed asvinfo;
|
||
|
||
*sinterpptr = NULL;
|
||
|
||
soname_indx = (bfd_size_type) -1;
|
||
|
||
if (!is_elf_hash_table (info->hash))
|
||
return TRUE;
|
||
|
||
bed = get_elf_backend_data (output_bfd);
|
||
|
||
/* Any syms created from now on start with -1 in
|
||
got.refcount/offset and plt.refcount/offset. */
|
||
elf_hash_table (info)->init_got_refcount
|
||
= elf_hash_table (info)->init_got_offset;
|
||
elf_hash_table (info)->init_plt_refcount
|
||
= elf_hash_table (info)->init_plt_offset;
|
||
|
||
if (info->relocatable
|
||
&& !_bfd_elf_size_group_sections (info))
|
||
return FALSE;
|
||
|
||
/* The backend may have to create some sections regardless of whether
|
||
we're dynamic or not. */
|
||
if (bed->elf_backend_always_size_sections
|
||
&& ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
|
||
return FALSE;
|
||
|
||
/* Determine any GNU_STACK segment requirements, after the backend
|
||
has had a chance to set a default segment size. */
|
||
if (info->execstack)
|
||
elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
|
||
else if (info->noexecstack)
|
||
elf_stack_flags (output_bfd) = PF_R | PF_W;
|
||
else
|
||
{
|
||
bfd *inputobj;
|
||
asection *notesec = NULL;
|
||
int exec = 0;
|
||
|
||
for (inputobj = info->input_bfds;
|
||
inputobj;
|
||
inputobj = inputobj->link.next)
|
||
{
|
||
asection *s;
|
||
|
||
if (inputobj->flags
|
||
& (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
|
||
continue;
|
||
s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
|
||
if (s)
|
||
{
|
||
if (s->flags & SEC_CODE)
|
||
exec = PF_X;
|
||
notesec = s;
|
||
}
|
||
else if (bed->default_execstack)
|
||
exec = PF_X;
|
||
}
|
||
if (notesec || info->stacksize > 0)
|
||
elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
|
||
if (notesec && exec && info->relocatable
|
||
&& notesec->output_section != bfd_abs_section_ptr)
|
||
notesec->output_section->flags |= SEC_CODE;
|
||
}
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
struct elf_info_failed eif;
|
||
struct elf_link_hash_entry *h;
|
||
asection *dynstr;
|
||
struct bfd_elf_version_tree *t;
|
||
struct bfd_elf_version_expr *d;
|
||
asection *s;
|
||
bfd_boolean all_defined;
|
||
|
||
*sinterpptr = bfd_get_linker_section (dynobj, ".interp");
|
||
BFD_ASSERT (*sinterpptr != NULL || !info->executable);
|
||
|
||
if (soname != NULL)
|
||
{
|
||
soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
soname, TRUE);
|
||
if (soname_indx == (bfd_size_type) -1
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
|
||
return FALSE;
|
||
}
|
||
|
||
if (info->symbolic)
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
|
||
return FALSE;
|
||
info->flags |= DF_SYMBOLIC;
|
||
}
|
||
|
||
if (rpath != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
bfd_vma tag;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
|
||
TRUE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
|
||
tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
|
||
if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
|
||
return FALSE;
|
||
}
|
||
|
||
if (filter_shlib != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
filter_shlib, TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
|
||
return FALSE;
|
||
}
|
||
|
||
if (auxiliary_filters != NULL)
|
||
{
|
||
const char * const *p;
|
||
|
||
for (p = auxiliary_filters; *p != NULL; p++)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
*p, TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
if (audit != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
|
||
TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
|
||
return FALSE;
|
||
}
|
||
|
||
if (depaudit != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
|
||
TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
|
||
return FALSE;
|
||
}
|
||
|
||
eif.info = info;
|
||
eif.failed = FALSE;
|
||
|
||
/* If we are supposed to export all symbols into the dynamic symbol
|
||
table (this is not the normal case), then do so. */
|
||
if (info->export_dynamic
|
||
|| (info->executable && info->dynamic))
|
||
{
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_export_symbol,
|
||
&eif);
|
||
if (eif.failed)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Make all global versions with definition. */
|
||
for (t = info->version_info; t != NULL; t = t->next)
|
||
for (d = t->globals.list; d != NULL; d = d->next)
|
||
if (!d->symver && d->literal)
|
||
{
|
||
const char *verstr, *name;
|
||
size_t namelen, verlen, newlen;
|
||
char *newname, *p, leading_char;
|
||
struct elf_link_hash_entry *newh;
|
||
|
||
leading_char = bfd_get_symbol_leading_char (output_bfd);
|
||
name = d->pattern;
|
||
namelen = strlen (name) + (leading_char != '\0');
|
||
verstr = t->name;
|
||
verlen = strlen (verstr);
|
||
newlen = namelen + verlen + 3;
|
||
|
||
newname = (char *) bfd_malloc (newlen);
|
||
if (newname == NULL)
|
||
return FALSE;
|
||
newname[0] = leading_char;
|
||
memcpy (newname + (leading_char != '\0'), name, namelen);
|
||
|
||
/* Check the hidden versioned definition. */
|
||
p = newname + namelen;
|
||
*p++ = ELF_VER_CHR;
|
||
memcpy (p, verstr, verlen + 1);
|
||
newh = elf_link_hash_lookup (elf_hash_table (info),
|
||
newname, FALSE, FALSE,
|
||
FALSE);
|
||
if (newh == NULL
|
||
|| (newh->root.type != bfd_link_hash_defined
|
||
&& newh->root.type != bfd_link_hash_defweak))
|
||
{
|
||
/* Check the default versioned definition. */
|
||
*p++ = ELF_VER_CHR;
|
||
memcpy (p, verstr, verlen + 1);
|
||
newh = elf_link_hash_lookup (elf_hash_table (info),
|
||
newname, FALSE, FALSE,
|
||
FALSE);
|
||
}
|
||
free (newname);
|
||
|
||
/* Mark this version if there is a definition and it is
|
||
not defined in a shared object. */
|
||
if (newh != NULL
|
||
&& !newh->def_dynamic
|
||
&& (newh->root.type == bfd_link_hash_defined
|
||
|| newh->root.type == bfd_link_hash_defweak))
|
||
d->symver = 1;
|
||
}
|
||
|
||
/* Attach all the symbols to their version information. */
|
||
asvinfo.info = info;
|
||
asvinfo.failed = FALSE;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_link_assign_sym_version,
|
||
&asvinfo);
|
||
if (asvinfo.failed)
|
||
return FALSE;
|
||
|
||
if (!info->allow_undefined_version)
|
||
{
|
||
/* Check if all global versions have a definition. */
|
||
all_defined = TRUE;
|
||
for (t = info->version_info; t != NULL; t = t->next)
|
||
for (d = t->globals.list; d != NULL; d = d->next)
|
||
if (d->literal && !d->symver && !d->script)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: undefined version: %s"),
|
||
d->pattern, t->name);
|
||
all_defined = FALSE;
|
||
}
|
||
|
||
if (!all_defined)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* Find all symbols which were defined in a dynamic object and make
|
||
the backend pick a reasonable value for them. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_adjust_dynamic_symbol,
|
||
&eif);
|
||
if (eif.failed)
|
||
return FALSE;
|
||
|
||
/* Add some entries to the .dynamic section. We fill in some of the
|
||
values later, in bfd_elf_final_link, but we must add the entries
|
||
now so that we know the final size of the .dynamic section. */
|
||
|
||
/* If there are initialization and/or finalization functions to
|
||
call then add the corresponding DT_INIT/DT_FINI entries. */
|
||
h = (info->init_function
|
||
? elf_link_hash_lookup (elf_hash_table (info),
|
||
info->init_function, FALSE,
|
||
FALSE, FALSE)
|
||
: NULL);
|
||
if (h != NULL
|
||
&& (h->ref_regular
|
||
|| h->def_regular))
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
|
||
return FALSE;
|
||
}
|
||
h = (info->fini_function
|
||
? elf_link_hash_lookup (elf_hash_table (info),
|
||
info->fini_function, FALSE,
|
||
FALSE, FALSE)
|
||
: NULL);
|
||
if (h != NULL
|
||
&& (h->ref_regular
|
||
|| h->def_regular))
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
s = bfd_get_section_by_name (output_bfd, ".preinit_array");
|
||
if (s != NULL && s->linker_has_input)
|
||
{
|
||
/* DT_PREINIT_ARRAY is not allowed in shared library. */
|
||
if (! info->executable)
|
||
{
|
||
bfd *sub;
|
||
asection *o;
|
||
|
||
for (sub = info->input_bfds; sub != NULL;
|
||
sub = sub->link.next)
|
||
if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
if (elf_section_data (o)->this_hdr.sh_type
|
||
== SHT_PREINIT_ARRAY)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: .preinit_array section is not allowed in DSO"),
|
||
sub);
|
||
break;
|
||
}
|
||
|
||
bfd_set_error (bfd_error_nonrepresentable_section);
|
||
return FALSE;
|
||
}
|
||
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
|
||
return FALSE;
|
||
}
|
||
s = bfd_get_section_by_name (output_bfd, ".init_array");
|
||
if (s != NULL && s->linker_has_input)
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
|
||
return FALSE;
|
||
}
|
||
s = bfd_get_section_by_name (output_bfd, ".fini_array");
|
||
if (s != NULL && s->linker_has_input)
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
dynstr = bfd_get_linker_section (dynobj, ".dynstr");
|
||
/* If .dynstr is excluded from the link, we don't want any of
|
||
these tags. Strictly, we should be checking each section
|
||
individually; This quick check covers for the case where
|
||
someone does a /DISCARD/ : { *(*) }. */
|
||
if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
|
||
{
|
||
bfd_size_type strsize;
|
||
|
||
strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
|
||
if ((info->emit_hash
|
||
&& !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
|
||
|| (info->emit_gnu_hash
|
||
&& !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
|
||
bed->s->sizeof_sym))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* The backend must work out the sizes of all the other dynamic
|
||
sections. */
|
||
if (dynobj != NULL
|
||
&& bed->elf_backend_size_dynamic_sections != NULL
|
||
&& ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
|
||
return FALSE;
|
||
|
||
if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
|
||
return FALSE;
|
||
|
||
if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
unsigned long section_sym_count;
|
||
struct bfd_elf_version_tree *verdefs;
|
||
asection *s;
|
||
|
||
/* Set up the version definition section. */
|
||
s = bfd_get_linker_section (dynobj, ".gnu.version_d");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
/* We may have created additional version definitions if we are
|
||
just linking a regular application. */
|
||
verdefs = info->version_info;
|
||
|
||
/* Skip anonymous version tag. */
|
||
if (verdefs != NULL && verdefs->vernum == 0)
|
||
verdefs = verdefs->next;
|
||
|
||
if (verdefs == NULL && !info->create_default_symver)
|
||
s->flags |= SEC_EXCLUDE;
|
||
else
|
||
{
|
||
unsigned int cdefs;
|
||
bfd_size_type size;
|
||
struct bfd_elf_version_tree *t;
|
||
bfd_byte *p;
|
||
Elf_Internal_Verdef def;
|
||
Elf_Internal_Verdaux defaux;
|
||
struct bfd_link_hash_entry *bh;
|
||
struct elf_link_hash_entry *h;
|
||
const char *name;
|
||
|
||
cdefs = 0;
|
||
size = 0;
|
||
|
||
/* Make space for the base version. */
|
||
size += sizeof (Elf_External_Verdef);
|
||
size += sizeof (Elf_External_Verdaux);
|
||
++cdefs;
|
||
|
||
/* Make space for the default version. */
|
||
if (info->create_default_symver)
|
||
{
|
||
size += sizeof (Elf_External_Verdef);
|
||
++cdefs;
|
||
}
|
||
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
{
|
||
struct bfd_elf_version_deps *n;
|
||
|
||
/* Don't emit base version twice. */
|
||
if (t->vernum == 0)
|
||
continue;
|
||
|
||
size += sizeof (Elf_External_Verdef);
|
||
size += sizeof (Elf_External_Verdaux);
|
||
++cdefs;
|
||
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
size += sizeof (Elf_External_Verdaux);
|
||
}
|
||
|
||
s->size = size;
|
||
s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
|
||
if (s->contents == NULL && s->size != 0)
|
||
return FALSE;
|
||
|
||
/* Fill in the version definition section. */
|
||
|
||
p = s->contents;
|
||
|
||
def.vd_version = VER_DEF_CURRENT;
|
||
def.vd_flags = VER_FLG_BASE;
|
||
def.vd_ndx = 1;
|
||
def.vd_cnt = 1;
|
||
if (info->create_default_symver)
|
||
{
|
||
def.vd_aux = 2 * sizeof (Elf_External_Verdef);
|
||
def.vd_next = sizeof (Elf_External_Verdef);
|
||
}
|
||
else
|
||
{
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ sizeof (Elf_External_Verdaux));
|
||
}
|
||
|
||
if (soname_indx != (bfd_size_type) -1)
|
||
{
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
|
||
soname_indx);
|
||
def.vd_hash = bfd_elf_hash (soname);
|
||
defaux.vda_name = soname_indx;
|
||
name = soname;
|
||
}
|
||
else
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
name = lbasename (output_bfd->filename);
|
||
def.vd_hash = bfd_elf_hash (name);
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
name, FALSE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
defaux.vda_name = indx;
|
||
}
|
||
defaux.vda_next = 0;
|
||
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *) p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
if (info->create_default_symver)
|
||
{
|
||
/* Add a symbol representing this version. */
|
||
bh = NULL;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
|
||
0, NULL, FALSE,
|
||
get_elf_backend_data (dynobj)->collect, &bh)))
|
||
return FALSE;
|
||
h = (struct elf_link_hash_entry *) bh;
|
||
h->non_elf = 0;
|
||
h->def_regular = 1;
|
||
h->type = STT_OBJECT;
|
||
h->verinfo.vertree = NULL;
|
||
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
|
||
/* Create a duplicate of the base version with the same
|
||
aux block, but different flags. */
|
||
def.vd_flags = 0;
|
||
def.vd_ndx = 2;
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
if (verdefs)
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ sizeof (Elf_External_Verdaux));
|
||
else
|
||
def.vd_next = 0;
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *) p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
}
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
{
|
||
unsigned int cdeps;
|
||
struct bfd_elf_version_deps *n;
|
||
|
||
/* Don't emit the base version twice. */
|
||
if (t->vernum == 0)
|
||
continue;
|
||
|
||
cdeps = 0;
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
++cdeps;
|
||
|
||
/* Add a symbol representing this version. */
|
||
bh = NULL;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
|
||
0, NULL, FALSE,
|
||
get_elf_backend_data (dynobj)->collect, &bh)))
|
||
return FALSE;
|
||
h = (struct elf_link_hash_entry *) bh;
|
||
h->non_elf = 0;
|
||
h->def_regular = 1;
|
||
h->type = STT_OBJECT;
|
||
h->verinfo.vertree = t;
|
||
|
||
if (! bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
|
||
def.vd_version = VER_DEF_CURRENT;
|
||
def.vd_flags = 0;
|
||
if (t->globals.list == NULL
|
||
&& t->locals.list == NULL
|
||
&& ! t->used)
|
||
def.vd_flags |= VER_FLG_WEAK;
|
||
def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
|
||
def.vd_cnt = cdeps + 1;
|
||
def.vd_hash = bfd_elf_hash (t->name);
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
def.vd_next = 0;
|
||
|
||
/* If a basever node is next, it *must* be the last node in
|
||
the chain, otherwise Verdef construction breaks. */
|
||
if (t->next != NULL && t->next->vernum == 0)
|
||
BFD_ASSERT (t->next->next == NULL);
|
||
|
||
if (t->next != NULL && t->next->vernum != 0)
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ (cdeps + 1) * sizeof (Elf_External_Verdaux));
|
||
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *) p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
|
||
defaux.vda_name = h->dynstr_index;
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
|
||
h->dynstr_index);
|
||
defaux.vda_next = 0;
|
||
if (t->deps != NULL)
|
||
defaux.vda_next = sizeof (Elf_External_Verdaux);
|
||
t->name_indx = defaux.vda_name;
|
||
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
{
|
||
if (n->version_needed == NULL)
|
||
{
|
||
/* This can happen if there was an error in the
|
||
version script. */
|
||
defaux.vda_name = 0;
|
||
}
|
||
else
|
||
{
|
||
defaux.vda_name = n->version_needed->name_indx;
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
|
||
defaux.vda_name);
|
||
}
|
||
if (n->next == NULL)
|
||
defaux.vda_next = 0;
|
||
else
|
||
defaux.vda_next = sizeof (Elf_External_Verdaux);
|
||
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
}
|
||
}
|
||
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
|
||
return FALSE;
|
||
|
||
elf_tdata (output_bfd)->cverdefs = cdefs;
|
||
}
|
||
|
||
if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
|
||
return FALSE;
|
||
}
|
||
else if (info->flags & DF_BIND_NOW)
|
||
{
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
if (info->flags_1)
|
||
{
|
||
if (info->executable)
|
||
info->flags_1 &= ~ (DF_1_INITFIRST
|
||
| DF_1_NODELETE
|
||
| DF_1_NOOPEN);
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Work out the size of the version reference section. */
|
||
|
||
s = bfd_get_linker_section (dynobj, ".gnu.version_r");
|
||
BFD_ASSERT (s != NULL);
|
||
{
|
||
struct elf_find_verdep_info sinfo;
|
||
|
||
sinfo.info = info;
|
||
sinfo.vers = elf_tdata (output_bfd)->cverdefs;
|
||
if (sinfo.vers == 0)
|
||
sinfo.vers = 1;
|
||
sinfo.failed = FALSE;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_link_find_version_dependencies,
|
||
&sinfo);
|
||
if (sinfo.failed)
|
||
return FALSE;
|
||
|
||
if (elf_tdata (output_bfd)->verref == NULL)
|
||
s->flags |= SEC_EXCLUDE;
|
||
else
|
||
{
|
||
Elf_Internal_Verneed *t;
|
||
unsigned int size;
|
||
unsigned int crefs;
|
||
bfd_byte *p;
|
||
|
||
/* Build the version dependency section. */
|
||
size = 0;
|
||
crefs = 0;
|
||
for (t = elf_tdata (output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
size += sizeof (Elf_External_Verneed);
|
||
++crefs;
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
size += sizeof (Elf_External_Vernaux);
|
||
}
|
||
|
||
s->size = size;
|
||
s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
p = s->contents;
|
||
for (t = elf_tdata (output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
unsigned int caux;
|
||
Elf_Internal_Vernaux *a;
|
||
bfd_size_type indx;
|
||
|
||
caux = 0;
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
++caux;
|
||
|
||
t->vn_version = VER_NEED_CURRENT;
|
||
t->vn_cnt = caux;
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
elf_dt_name (t->vn_bfd) != NULL
|
||
? elf_dt_name (t->vn_bfd)
|
||
: lbasename (t->vn_bfd->filename),
|
||
FALSE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
t->vn_file = indx;
|
||
t->vn_aux = sizeof (Elf_External_Verneed);
|
||
if (t->vn_nextref == NULL)
|
||
t->vn_next = 0;
|
||
else
|
||
t->vn_next = (sizeof (Elf_External_Verneed)
|
||
+ caux * sizeof (Elf_External_Vernaux));
|
||
|
||
_bfd_elf_swap_verneed_out (output_bfd, t,
|
||
(Elf_External_Verneed *) p);
|
||
p += sizeof (Elf_External_Verneed);
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
{
|
||
a->vna_hash = bfd_elf_hash (a->vna_nodename);
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
a->vna_nodename, FALSE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
a->vna_name = indx;
|
||
if (a->vna_nextptr == NULL)
|
||
a->vna_next = 0;
|
||
else
|
||
a->vna_next = sizeof (Elf_External_Vernaux);
|
||
|
||
_bfd_elf_swap_vernaux_out (output_bfd, a,
|
||
(Elf_External_Vernaux *) p);
|
||
p += sizeof (Elf_External_Vernaux);
|
||
}
|
||
}
|
||
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
|
||
return FALSE;
|
||
|
||
elf_tdata (output_bfd)->cverrefs = crefs;
|
||
}
|
||
}
|
||
|
||
if ((elf_tdata (output_bfd)->cverrefs == 0
|
||
&& elf_tdata (output_bfd)->cverdefs == 0)
|
||
|| _bfd_elf_link_renumber_dynsyms (output_bfd, info,
|
||
§ion_sym_count) == 0)
|
||
{
|
||
s = bfd_get_linker_section (dynobj, ".gnu.version");
|
||
s->flags |= SEC_EXCLUDE;
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Find the first non-excluded output section. We'll use its
|
||
section symbol for some emitted relocs. */
|
||
void
|
||
_bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
asection *s;
|
||
|
||
for (s = output_bfd->sections; s != NULL; s = s->next)
|
||
if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
|
||
&& !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
|
||
{
|
||
elf_hash_table (info)->text_index_section = s;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Find two non-excluded output sections, one for code, one for data.
|
||
We'll use their section symbols for some emitted relocs. */
|
||
void
|
||
_bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
asection *s;
|
||
|
||
/* Data first, since setting text_index_section changes
|
||
_bfd_elf_link_omit_section_dynsym. */
|
||
for (s = output_bfd->sections; s != NULL; s = s->next)
|
||
if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
|
||
&& !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
|
||
{
|
||
elf_hash_table (info)->data_index_section = s;
|
||
break;
|
||
}
|
||
|
||
for (s = output_bfd->sections; s != NULL; s = s->next)
|
||
if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
|
||
== (SEC_ALLOC | SEC_READONLY))
|
||
&& !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
|
||
{
|
||
elf_hash_table (info)->text_index_section = s;
|
||
break;
|
||
}
|
||
|
||
if (elf_hash_table (info)->text_index_section == NULL)
|
||
elf_hash_table (info)->text_index_section
|
||
= elf_hash_table (info)->data_index_section;
|
||
}
|
||
|
||
bfd_boolean
|
||
bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
if (!is_elf_hash_table (info->hash))
|
||
return TRUE;
|
||
|
||
bed = get_elf_backend_data (output_bfd);
|
||
(*bed->elf_backend_init_index_section) (output_bfd, info);
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
bfd *dynobj;
|
||
asection *s;
|
||
bfd_size_type dynsymcount;
|
||
unsigned long section_sym_count;
|
||
unsigned int dtagcount;
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
/* Assign dynsym indicies. In a shared library we generate a
|
||
section symbol for each output section, which come first.
|
||
Next come all of the back-end allocated local dynamic syms,
|
||
followed by the rest of the global symbols. */
|
||
|
||
dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
|
||
§ion_sym_count);
|
||
|
||
/* Work out the size of the symbol version section. */
|
||
s = bfd_get_linker_section (dynobj, ".gnu.version");
|
||
BFD_ASSERT (s != NULL);
|
||
if (dynsymcount != 0
|
||
&& (s->flags & SEC_EXCLUDE) == 0)
|
||
{
|
||
s->size = dynsymcount * sizeof (Elf_External_Versym);
|
||
s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Set the size of the .dynsym and .hash sections. We counted
|
||
the number of dynamic symbols in elf_link_add_object_symbols.
|
||
We will build the contents of .dynsym and .hash when we build
|
||
the final symbol table, because until then we do not know the
|
||
correct value to give the symbols. We built the .dynstr
|
||
section as we went along in elf_link_add_object_symbols. */
|
||
s = bfd_get_linker_section (dynobj, ".dynsym");
|
||
BFD_ASSERT (s != NULL);
|
||
s->size = dynsymcount * bed->s->sizeof_sym;
|
||
|
||
if (dynsymcount != 0)
|
||
{
|
||
s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
/* The first entry in .dynsym is a dummy symbol.
|
||
Clear all the section syms, in case we don't output them all. */
|
||
++section_sym_count;
|
||
memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
|
||
}
|
||
|
||
elf_hash_table (info)->bucketcount = 0;
|
||
|
||
/* Compute the size of the hashing table. As a side effect this
|
||
computes the hash values for all the names we export. */
|
||
if (info->emit_hash)
|
||
{
|
||
unsigned long int *hashcodes;
|
||
struct hash_codes_info hashinf;
|
||
bfd_size_type amt;
|
||
unsigned long int nsyms;
|
||
size_t bucketcount;
|
||
size_t hash_entry_size;
|
||
|
||
/* Compute the hash values for all exported symbols. At the same
|
||
time store the values in an array so that we could use them for
|
||
optimizations. */
|
||
amt = dynsymcount * sizeof (unsigned long int);
|
||
hashcodes = (unsigned long int *) bfd_malloc (amt);
|
||
if (hashcodes == NULL)
|
||
return FALSE;
|
||
hashinf.hashcodes = hashcodes;
|
||
hashinf.error = FALSE;
|
||
|
||
/* Put all hash values in HASHCODES. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_collect_hash_codes, &hashinf);
|
||
if (hashinf.error)
|
||
{
|
||
free (hashcodes);
|
||
return FALSE;
|
||
}
|
||
|
||
nsyms = hashinf.hashcodes - hashcodes;
|
||
bucketcount
|
||
= compute_bucket_count (info, hashcodes, nsyms, 0);
|
||
free (hashcodes);
|
||
|
||
if (bucketcount == 0)
|
||
return FALSE;
|
||
|
||
elf_hash_table (info)->bucketcount = bucketcount;
|
||
|
||
s = bfd_get_linker_section (dynobj, ".hash");
|
||
BFD_ASSERT (s != NULL);
|
||
hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
|
||
s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
|
||
s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
|
||
bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
|
||
s->contents + hash_entry_size);
|
||
}
|
||
|
||
if (info->emit_gnu_hash)
|
||
{
|
||
size_t i, cnt;
|
||
unsigned char *contents;
|
||
struct collect_gnu_hash_codes cinfo;
|
||
bfd_size_type amt;
|
||
size_t bucketcount;
|
||
|
||
memset (&cinfo, 0, sizeof (cinfo));
|
||
|
||
/* Compute the hash values for all exported symbols. At the same
|
||
time store the values in an array so that we could use them for
|
||
optimizations. */
|
||
amt = dynsymcount * 2 * sizeof (unsigned long int);
|
||
cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
|
||
if (cinfo.hashcodes == NULL)
|
||
return FALSE;
|
||
|
||
cinfo.hashval = cinfo.hashcodes + dynsymcount;
|
||
cinfo.min_dynindx = -1;
|
||
cinfo.output_bfd = output_bfd;
|
||
cinfo.bed = bed;
|
||
|
||
/* Put all hash values in HASHCODES. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_collect_gnu_hash_codes, &cinfo);
|
||
if (cinfo.error)
|
||
{
|
||
free (cinfo.hashcodes);
|
||
return FALSE;
|
||
}
|
||
|
||
bucketcount
|
||
= compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
|
||
|
||
if (bucketcount == 0)
|
||
{
|
||
free (cinfo.hashcodes);
|
||
return FALSE;
|
||
}
|
||
|
||
s = bfd_get_linker_section (dynobj, ".gnu.hash");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
if (cinfo.nsyms == 0)
|
||
{
|
||
/* Empty .gnu.hash section is special. */
|
||
BFD_ASSERT (cinfo.min_dynindx == -1);
|
||
free (cinfo.hashcodes);
|
||
s->size = 5 * 4 + bed->s->arch_size / 8;
|
||
contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
|
||
if (contents == NULL)
|
||
return FALSE;
|
||
s->contents = contents;
|
||
/* 1 empty bucket. */
|
||
bfd_put_32 (output_bfd, 1, contents);
|
||
/* SYMIDX above the special symbol 0. */
|
||
bfd_put_32 (output_bfd, 1, contents + 4);
|
||
/* Just one word for bitmask. */
|
||
bfd_put_32 (output_bfd, 1, contents + 8);
|
||
/* Only hash fn bloom filter. */
|
||
bfd_put_32 (output_bfd, 0, contents + 12);
|
||
/* No hashes are valid - empty bitmask. */
|
||
bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
|
||
/* No hashes in the only bucket. */
|
||
bfd_put_32 (output_bfd, 0,
|
||
contents + 16 + bed->s->arch_size / 8);
|
||
}
|
||
else
|
||
{
|
||
unsigned long int maskwords, maskbitslog2, x;
|
||
BFD_ASSERT (cinfo.min_dynindx != -1);
|
||
|
||
x = cinfo.nsyms;
|
||
maskbitslog2 = 1;
|
||
while ((x >>= 1) != 0)
|
||
++maskbitslog2;
|
||
if (maskbitslog2 < 3)
|
||
maskbitslog2 = 5;
|
||
else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
|
||
maskbitslog2 = maskbitslog2 + 3;
|
||
else
|
||
maskbitslog2 = maskbitslog2 + 2;
|
||
if (bed->s->arch_size == 64)
|
||
{
|
||
if (maskbitslog2 == 5)
|
||
maskbitslog2 = 6;
|
||
cinfo.shift1 = 6;
|
||
}
|
||
else
|
||
cinfo.shift1 = 5;
|
||
cinfo.mask = (1 << cinfo.shift1) - 1;
|
||
cinfo.shift2 = maskbitslog2;
|
||
cinfo.maskbits = 1 << maskbitslog2;
|
||
maskwords = 1 << (maskbitslog2 - cinfo.shift1);
|
||
amt = bucketcount * sizeof (unsigned long int) * 2;
|
||
amt += maskwords * sizeof (bfd_vma);
|
||
cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
|
||
if (cinfo.bitmask == NULL)
|
||
{
|
||
free (cinfo.hashcodes);
|
||
return FALSE;
|
||
}
|
||
|
||
cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
|
||
cinfo.indx = cinfo.counts + bucketcount;
|
||
cinfo.symindx = dynsymcount - cinfo.nsyms;
|
||
memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
|
||
|
||
/* Determine how often each hash bucket is used. */
|
||
memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
|
||
for (i = 0; i < cinfo.nsyms; ++i)
|
||
++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
|
||
|
||
for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
|
||
if (cinfo.counts[i] != 0)
|
||
{
|
||
cinfo.indx[i] = cnt;
|
||
cnt += cinfo.counts[i];
|
||
}
|
||
BFD_ASSERT (cnt == dynsymcount);
|
||
cinfo.bucketcount = bucketcount;
|
||
cinfo.local_indx = cinfo.min_dynindx;
|
||
|
||
s->size = (4 + bucketcount + cinfo.nsyms) * 4;
|
||
s->size += cinfo.maskbits / 8;
|
||
contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
|
||
if (contents == NULL)
|
||
{
|
||
free (cinfo.bitmask);
|
||
free (cinfo.hashcodes);
|
||
return FALSE;
|
||
}
|
||
|
||
s->contents = contents;
|
||
bfd_put_32 (output_bfd, bucketcount, contents);
|
||
bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
|
||
bfd_put_32 (output_bfd, maskwords, contents + 8);
|
||
bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
|
||
contents += 16 + cinfo.maskbits / 8;
|
||
|
||
for (i = 0; i < bucketcount; ++i)
|
||
{
|
||
if (cinfo.counts[i] == 0)
|
||
bfd_put_32 (output_bfd, 0, contents);
|
||
else
|
||
bfd_put_32 (output_bfd, cinfo.indx[i], contents);
|
||
contents += 4;
|
||
}
|
||
|
||
cinfo.contents = contents;
|
||
|
||
/* Renumber dynamic symbols, populate .gnu.hash section. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_renumber_gnu_hash_syms, &cinfo);
|
||
|
||
contents = s->contents + 16;
|
||
for (i = 0; i < maskwords; ++i)
|
||
{
|
||
bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
|
||
contents);
|
||
contents += bed->s->arch_size / 8;
|
||
}
|
||
|
||
free (cinfo.bitmask);
|
||
free (cinfo.hashcodes);
|
||
}
|
||
}
|
||
|
||
s = bfd_get_linker_section (dynobj, ".dynstr");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
elf_finalize_dynstr (output_bfd, info);
|
||
|
||
s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
|
||
|
||
for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Make sure sec_info_type is cleared if sec_info is cleared too. */
|
||
|
||
static void
|
||
merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *sec)
|
||
{
|
||
BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
|
||
sec->sec_info_type = SEC_INFO_TYPE_NONE;
|
||
}
|
||
|
||
/* Finish SHF_MERGE section merging. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd *ibfd;
|
||
asection *sec;
|
||
|
||
if (!is_elf_hash_table (info->hash))
|
||
return FALSE;
|
||
|
||
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
|
||
if ((ibfd->flags & DYNAMIC) == 0)
|
||
for (sec = ibfd->sections; sec != NULL; sec = sec->next)
|
||
if ((sec->flags & SEC_MERGE) != 0
|
||
&& !bfd_is_abs_section (sec->output_section))
|
||
{
|
||
struct bfd_elf_section_data *secdata;
|
||
|
||
secdata = elf_section_data (sec);
|
||
if (! _bfd_add_merge_section (abfd,
|
||
&elf_hash_table (info)->merge_info,
|
||
sec, &secdata->sec_info))
|
||
return FALSE;
|
||
else if (secdata->sec_info)
|
||
sec->sec_info_type = SEC_INFO_TYPE_MERGE;
|
||
}
|
||
|
||
if (elf_hash_table (info)->merge_info != NULL)
|
||
_bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
|
||
merge_sections_remove_hook);
|
||
return TRUE;
|
||
}
|
||
|
||
/* Create an entry in an ELF linker hash table. */
|
||
|
||
struct bfd_hash_entry *
|
||
_bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
|
||
struct bfd_hash_table *table,
|
||
const char *string)
|
||
{
|
||
/* Allocate the structure if it has not already been allocated by a
|
||
subclass. */
|
||
if (entry == NULL)
|
||
{
|
||
entry = (struct bfd_hash_entry *)
|
||
bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
|
||
if (entry == NULL)
|
||
return entry;
|
||
}
|
||
|
||
/* Call the allocation method of the superclass. */
|
||
entry = _bfd_link_hash_newfunc (entry, table, string);
|
||
if (entry != NULL)
|
||
{
|
||
struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
|
||
struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
|
||
|
||
/* Set local fields. */
|
||
ret->indx = -1;
|
||
ret->dynindx = -1;
|
||
ret->got = htab->init_got_refcount;
|
||
ret->plt = htab->init_plt_refcount;
|
||
memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
|
||
- offsetof (struct elf_link_hash_entry, size)));
|
||
/* Assume that we have been called by a non-ELF symbol reader.
|
||
This flag is then reset by the code which reads an ELF input
|
||
file. This ensures that a symbol created by a non-ELF symbol
|
||
reader will have the flag set correctly. */
|
||
ret->non_elf = 1;
|
||
}
|
||
|
||
return entry;
|
||
}
|
||
|
||
/* Copy data from an indirect symbol to its direct symbol, hiding the
|
||
old indirect symbol. Also used for copying flags to a weakdef. */
|
||
|
||
void
|
||
_bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *dir,
|
||
struct elf_link_hash_entry *ind)
|
||
{
|
||
struct elf_link_hash_table *htab;
|
||
|
||
/* Copy down any references that we may have already seen to the
|
||
symbol which just became indirect. */
|
||
|
||
dir->ref_dynamic |= ind->ref_dynamic;
|
||
dir->ref_regular |= ind->ref_regular;
|
||
dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
|
||
dir->non_got_ref |= ind->non_got_ref;
|
||
dir->needs_plt |= ind->needs_plt;
|
||
dir->pointer_equality_needed |= ind->pointer_equality_needed;
|
||
|
||
if (ind->root.type != bfd_link_hash_indirect)
|
||
return;
|
||
|
||
/* Copy over the global and procedure linkage table refcount entries.
|
||
These may have been already set up by a check_relocs routine. */
|
||
htab = elf_hash_table (info);
|
||
if (ind->got.refcount > htab->init_got_refcount.refcount)
|
||
{
|
||
if (dir->got.refcount < 0)
|
||
dir->got.refcount = 0;
|
||
dir->got.refcount += ind->got.refcount;
|
||
ind->got.refcount = htab->init_got_refcount.refcount;
|
||
}
|
||
|
||
if (ind->plt.refcount > htab->init_plt_refcount.refcount)
|
||
{
|
||
if (dir->plt.refcount < 0)
|
||
dir->plt.refcount = 0;
|
||
dir->plt.refcount += ind->plt.refcount;
|
||
ind->plt.refcount = htab->init_plt_refcount.refcount;
|
||
}
|
||
|
||
if (ind->dynindx != -1)
|
||
{
|
||
if (dir->dynindx != -1)
|
||
_bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
|
||
dir->dynindx = ind->dynindx;
|
||
dir->dynstr_index = ind->dynstr_index;
|
||
ind->dynindx = -1;
|
||
ind->dynstr_index = 0;
|
||
}
|
||
}
|
||
|
||
void
|
||
_bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h,
|
||
bfd_boolean force_local)
|
||
{
|
||
/* STT_GNU_IFUNC symbol must go through PLT. */
|
||
if (h->type != STT_GNU_IFUNC)
|
||
{
|
||
h->plt = elf_hash_table (info)->init_plt_offset;
|
||
h->needs_plt = 0;
|
||
}
|
||
if (force_local)
|
||
{
|
||
h->forced_local = 1;
|
||
if (h->dynindx != -1)
|
||
{
|
||
h->dynindx = -1;
|
||
_bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
|
||
h->dynstr_index);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Initialize an ELF linker hash table. *TABLE has been zeroed by our
|
||
caller. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_link_hash_table_init
|
||
(struct elf_link_hash_table *table,
|
||
bfd *abfd,
|
||
struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
|
||
struct bfd_hash_table *,
|
||
const char *),
|
||
unsigned int entsize,
|
||
enum elf_target_id target_id)
|
||
{
|
||
bfd_boolean ret;
|
||
int can_refcount = get_elf_backend_data (abfd)->can_refcount;
|
||
|
||
table->init_got_refcount.refcount = can_refcount - 1;
|
||
table->init_plt_refcount.refcount = can_refcount - 1;
|
||
table->init_got_offset.offset = -(bfd_vma) 1;
|
||
table->init_plt_offset.offset = -(bfd_vma) 1;
|
||
/* The first dynamic symbol is a dummy. */
|
||
table->dynsymcount = 1;
|
||
|
||
ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
|
||
|
||
table->root.type = bfd_link_elf_hash_table;
|
||
table->hash_table_id = target_id;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Create an ELF linker hash table. */
|
||
|
||
struct bfd_link_hash_table *
|
||
_bfd_elf_link_hash_table_create (bfd *abfd)
|
||
{
|
||
struct elf_link_hash_table *ret;
|
||
bfd_size_type amt = sizeof (struct elf_link_hash_table);
|
||
|
||
ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
|
||
if (ret == NULL)
|
||
return NULL;
|
||
|
||
if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
|
||
sizeof (struct elf_link_hash_entry),
|
||
GENERIC_ELF_DATA))
|
||
{
|
||
free (ret);
|
||
return NULL;
|
||
}
|
||
ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
|
||
|
||
return &ret->root;
|
||
}
|
||
|
||
/* Destroy an ELF linker hash table. */
|
||
|
||
void
|
||
_bfd_elf_link_hash_table_free (bfd *obfd)
|
||
{
|
||
struct elf_link_hash_table *htab;
|
||
|
||
htab = (struct elf_link_hash_table *) obfd->link.hash;
|
||
if (htab->dynstr != NULL)
|
||
_bfd_elf_strtab_free (htab->dynstr);
|
||
_bfd_merge_sections_free (htab->merge_info);
|
||
_bfd_generic_link_hash_table_free (obfd);
|
||
}
|
||
|
||
/* This is a hook for the ELF emulation code in the generic linker to
|
||
tell the backend linker what file name to use for the DT_NEEDED
|
||
entry for a dynamic object. */
|
||
|
||
void
|
||
bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
|
||
{
|
||
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
|
||
&& bfd_get_format (abfd) == bfd_object)
|
||
elf_dt_name (abfd) = name;
|
||
}
|
||
|
||
int
|
||
bfd_elf_get_dyn_lib_class (bfd *abfd)
|
||
{
|
||
int lib_class;
|
||
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
|
||
&& bfd_get_format (abfd) == bfd_object)
|
||
lib_class = elf_dyn_lib_class (abfd);
|
||
else
|
||
lib_class = 0;
|
||
return lib_class;
|
||
}
|
||
|
||
void
|
||
bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
|
||
{
|
||
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
|
||
&& bfd_get_format (abfd) == bfd_object)
|
||
elf_dyn_lib_class (abfd) = lib_class;
|
||
}
|
||
|
||
/* Get the list of DT_NEEDED entries for a link. This is a hook for
|
||
the linker ELF emulation code. */
|
||
|
||
struct bfd_link_needed_list *
|
||
bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
|
||
struct bfd_link_info *info)
|
||
{
|
||
if (! is_elf_hash_table (info->hash))
|
||
return NULL;
|
||
return elf_hash_table (info)->needed;
|
||
}
|
||
|
||
/* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
|
||
hook for the linker ELF emulation code. */
|
||
|
||
struct bfd_link_needed_list *
|
||
bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
|
||
struct bfd_link_info *info)
|
||
{
|
||
if (! is_elf_hash_table (info->hash))
|
||
return NULL;
|
||
return elf_hash_table (info)->runpath;
|
||
}
|
||
|
||
/* Get the name actually used for a dynamic object for a link. This
|
||
is the SONAME entry if there is one. Otherwise, it is the string
|
||
passed to bfd_elf_set_dt_needed_name, or it is the filename. */
|
||
|
||
const char *
|
||
bfd_elf_get_dt_soname (bfd *abfd)
|
||
{
|
||
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
|
||
&& bfd_get_format (abfd) == bfd_object)
|
||
return elf_dt_name (abfd);
|
||
return NULL;
|
||
}
|
||
|
||
/* Get the list of DT_NEEDED entries from a BFD. This is a hook for
|
||
the ELF linker emulation code. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_get_bfd_needed_list (bfd *abfd,
|
||
struct bfd_link_needed_list **pneeded)
|
||
{
|
||
asection *s;
|
||
bfd_byte *dynbuf = NULL;
|
||
unsigned int elfsec;
|
||
unsigned long shlink;
|
||
bfd_byte *extdyn, *extdynend;
|
||
size_t extdynsize;
|
||
void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
|
||
|
||
*pneeded = NULL;
|
||
|
||
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
|
||
|| bfd_get_format (abfd) != bfd_object)
|
||
return TRUE;
|
||
|
||
s = bfd_get_section_by_name (abfd, ".dynamic");
|
||
if (s == NULL || s->size == 0)
|
||
return TRUE;
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
|
||
goto error_return;
|
||
|
||
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
|
||
if (elfsec == SHN_BAD)
|
||
goto error_return;
|
||
|
||
shlink = elf_elfsections (abfd)[elfsec]->sh_link;
|
||
|
||
extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
|
||
swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
|
||
|
||
extdyn = dynbuf;
|
||
extdynend = extdyn + s->size;
|
||
for (; extdyn < extdynend; extdyn += extdynsize)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
(*swap_dyn_in) (abfd, extdyn, &dyn);
|
||
|
||
if (dyn.d_tag == DT_NULL)
|
||
break;
|
||
|
||
if (dyn.d_tag == DT_NEEDED)
|
||
{
|
||
const char *string;
|
||
struct bfd_link_needed_list *l;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
bfd_size_type amt;
|
||
|
||
string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (string == NULL)
|
||
goto error_return;
|
||
|
||
amt = sizeof *l;
|
||
l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
|
||
if (l == NULL)
|
||
goto error_return;
|
||
|
||
l->by = abfd;
|
||
l->name = string;
|
||
l->next = *pneeded;
|
||
*pneeded = l;
|
||
}
|
||
}
|
||
|
||
free (dynbuf);
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (dynbuf != NULL)
|
||
free (dynbuf);
|
||
return FALSE;
|
||
}
|
||
|
||
struct elf_symbuf_symbol
|
||
{
|
||
unsigned long st_name; /* Symbol name, index in string tbl */
|
||
unsigned char st_info; /* Type and binding attributes */
|
||
unsigned char st_other; /* Visibilty, and target specific */
|
||
};
|
||
|
||
struct elf_symbuf_head
|
||
{
|
||
struct elf_symbuf_symbol *ssym;
|
||
bfd_size_type count;
|
||
unsigned int st_shndx;
|
||
};
|
||
|
||
struct elf_symbol
|
||
{
|
||
union
|
||
{
|
||
Elf_Internal_Sym *isym;
|
||
struct elf_symbuf_symbol *ssym;
|
||
} u;
|
||
const char *name;
|
||
};
|
||
|
||
/* Sort references to symbols by ascending section number. */
|
||
|
||
static int
|
||
elf_sort_elf_symbol (const void *arg1, const void *arg2)
|
||
{
|
||
const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
|
||
const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
|
||
|
||
return s1->st_shndx - s2->st_shndx;
|
||
}
|
||
|
||
static int
|
||
elf_sym_name_compare (const void *arg1, const void *arg2)
|
||
{
|
||
const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
|
||
const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
|
||
return strcmp (s1->name, s2->name);
|
||
}
|
||
|
||
static struct elf_symbuf_head *
|
||
elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
|
||
{
|
||
Elf_Internal_Sym **ind, **indbufend, **indbuf;
|
||
struct elf_symbuf_symbol *ssym;
|
||
struct elf_symbuf_head *ssymbuf, *ssymhead;
|
||
bfd_size_type i, shndx_count, total_size;
|
||
|
||
indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
|
||
if (indbuf == NULL)
|
||
return NULL;
|
||
|
||
for (ind = indbuf, i = 0; i < symcount; i++)
|
||
if (isymbuf[i].st_shndx != SHN_UNDEF)
|
||
*ind++ = &isymbuf[i];
|
||
indbufend = ind;
|
||
|
||
qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
|
||
elf_sort_elf_symbol);
|
||
|
||
shndx_count = 0;
|
||
if (indbufend > indbuf)
|
||
for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
|
||
if (ind[0]->st_shndx != ind[1]->st_shndx)
|
||
shndx_count++;
|
||
|
||
total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
|
||
+ (indbufend - indbuf) * sizeof (*ssym));
|
||
ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
|
||
if (ssymbuf == NULL)
|
||
{
|
||
free (indbuf);
|
||
return NULL;
|
||
}
|
||
|
||
ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
|
||
ssymbuf->ssym = NULL;
|
||
ssymbuf->count = shndx_count;
|
||
ssymbuf->st_shndx = 0;
|
||
for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
|
||
{
|
||
if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
|
||
{
|
||
ssymhead++;
|
||
ssymhead->ssym = ssym;
|
||
ssymhead->count = 0;
|
||
ssymhead->st_shndx = (*ind)->st_shndx;
|
||
}
|
||
ssym->st_name = (*ind)->st_name;
|
||
ssym->st_info = (*ind)->st_info;
|
||
ssym->st_other = (*ind)->st_other;
|
||
ssymhead->count++;
|
||
}
|
||
BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
|
||
&& (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
|
||
== total_size));
|
||
|
||
free (indbuf);
|
||
return ssymbuf;
|
||
}
|
||
|
||
/* Check if 2 sections define the same set of local and global
|
||
symbols. */
|
||
|
||
static bfd_boolean
|
||
bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
|
||
struct bfd_link_info *info)
|
||
{
|
||
bfd *bfd1, *bfd2;
|
||
const struct elf_backend_data *bed1, *bed2;
|
||
Elf_Internal_Shdr *hdr1, *hdr2;
|
||
bfd_size_type symcount1, symcount2;
|
||
Elf_Internal_Sym *isymbuf1, *isymbuf2;
|
||
struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
|
||
Elf_Internal_Sym *isym, *isymend;
|
||
struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
|
||
bfd_size_type count1, count2, i;
|
||
unsigned int shndx1, shndx2;
|
||
bfd_boolean result;
|
||
|
||
bfd1 = sec1->owner;
|
||
bfd2 = sec2->owner;
|
||
|
||
/* Both sections have to be in ELF. */
|
||
if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
|
||
|| bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
|
||
return FALSE;
|
||
|
||
if (elf_section_type (sec1) != elf_section_type (sec2))
|
||
return FALSE;
|
||
|
||
shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
|
||
shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
|
||
if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
|
||
return FALSE;
|
||
|
||
bed1 = get_elf_backend_data (bfd1);
|
||
bed2 = get_elf_backend_data (bfd2);
|
||
hdr1 = &elf_tdata (bfd1)->symtab_hdr;
|
||
symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
|
||
hdr2 = &elf_tdata (bfd2)->symtab_hdr;
|
||
symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
|
||
|
||
if (symcount1 == 0 || symcount2 == 0)
|
||
return FALSE;
|
||
|
||
result = FALSE;
|
||
isymbuf1 = NULL;
|
||
isymbuf2 = NULL;
|
||
ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
|
||
ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
|
||
|
||
if (ssymbuf1 == NULL)
|
||
{
|
||
isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf1 == NULL)
|
||
goto done;
|
||
|
||
if (!info->reduce_memory_overheads)
|
||
elf_tdata (bfd1)->symbuf = ssymbuf1
|
||
= elf_create_symbuf (symcount1, isymbuf1);
|
||
}
|
||
|
||
if (ssymbuf1 == NULL || ssymbuf2 == NULL)
|
||
{
|
||
isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf2 == NULL)
|
||
goto done;
|
||
|
||
if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
|
||
elf_tdata (bfd2)->symbuf = ssymbuf2
|
||
= elf_create_symbuf (symcount2, isymbuf2);
|
||
}
|
||
|
||
if (ssymbuf1 != NULL && ssymbuf2 != NULL)
|
||
{
|
||
/* Optimized faster version. */
|
||
bfd_size_type lo, hi, mid;
|
||
struct elf_symbol *symp;
|
||
struct elf_symbuf_symbol *ssym, *ssymend;
|
||
|
||
lo = 0;
|
||
hi = ssymbuf1->count;
|
||
ssymbuf1++;
|
||
count1 = 0;
|
||
while (lo < hi)
|
||
{
|
||
mid = (lo + hi) / 2;
|
||
if (shndx1 < ssymbuf1[mid].st_shndx)
|
||
hi = mid;
|
||
else if (shndx1 > ssymbuf1[mid].st_shndx)
|
||
lo = mid + 1;
|
||
else
|
||
{
|
||
count1 = ssymbuf1[mid].count;
|
||
ssymbuf1 += mid;
|
||
break;
|
||
}
|
||
}
|
||
|
||
lo = 0;
|
||
hi = ssymbuf2->count;
|
||
ssymbuf2++;
|
||
count2 = 0;
|
||
while (lo < hi)
|
||
{
|
||
mid = (lo + hi) / 2;
|
||
if (shndx2 < ssymbuf2[mid].st_shndx)
|
||
hi = mid;
|
||
else if (shndx2 > ssymbuf2[mid].st_shndx)
|
||
lo = mid + 1;
|
||
else
|
||
{
|
||
count2 = ssymbuf2[mid].count;
|
||
ssymbuf2 += mid;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (count1 == 0 || count2 == 0 || count1 != count2)
|
||
goto done;
|
||
|
||
symtable1
|
||
= (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
|
||
symtable2
|
||
= (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
|
||
if (symtable1 == NULL || symtable2 == NULL)
|
||
goto done;
|
||
|
||
symp = symtable1;
|
||
for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
|
||
ssym < ssymend; ssym++, symp++)
|
||
{
|
||
symp->u.ssym = ssym;
|
||
symp->name = bfd_elf_string_from_elf_section (bfd1,
|
||
hdr1->sh_link,
|
||
ssym->st_name);
|
||
}
|
||
|
||
symp = symtable2;
|
||
for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
|
||
ssym < ssymend; ssym++, symp++)
|
||
{
|
||
symp->u.ssym = ssym;
|
||
symp->name = bfd_elf_string_from_elf_section (bfd2,
|
||
hdr2->sh_link,
|
||
ssym->st_name);
|
||
}
|
||
|
||
/* Sort symbol by name. */
|
||
qsort (symtable1, count1, sizeof (struct elf_symbol),
|
||
elf_sym_name_compare);
|
||
qsort (symtable2, count1, sizeof (struct elf_symbol),
|
||
elf_sym_name_compare);
|
||
|
||
for (i = 0; i < count1; i++)
|
||
/* Two symbols must have the same binding, type and name. */
|
||
if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
|
||
|| symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
|
||
|| strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
|
||
goto done;
|
||
|
||
result = TRUE;
|
||
goto done;
|
||
}
|
||
|
||
symtable1 = (struct elf_symbol *)
|
||
bfd_malloc (symcount1 * sizeof (struct elf_symbol));
|
||
symtable2 = (struct elf_symbol *)
|
||
bfd_malloc (symcount2 * sizeof (struct elf_symbol));
|
||
if (symtable1 == NULL || symtable2 == NULL)
|
||
goto done;
|
||
|
||
/* Count definitions in the section. */
|
||
count1 = 0;
|
||
for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
|
||
if (isym->st_shndx == shndx1)
|
||
symtable1[count1++].u.isym = isym;
|
||
|
||
count2 = 0;
|
||
for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
|
||
if (isym->st_shndx == shndx2)
|
||
symtable2[count2++].u.isym = isym;
|
||
|
||
if (count1 == 0 || count2 == 0 || count1 != count2)
|
||
goto done;
|
||
|
||
for (i = 0; i < count1; i++)
|
||
symtable1[i].name
|
||
= bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
|
||
symtable1[i].u.isym->st_name);
|
||
|
||
for (i = 0; i < count2; i++)
|
||
symtable2[i].name
|
||
= bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
|
||
symtable2[i].u.isym->st_name);
|
||
|
||
/* Sort symbol by name. */
|
||
qsort (symtable1, count1, sizeof (struct elf_symbol),
|
||
elf_sym_name_compare);
|
||
qsort (symtable2, count1, sizeof (struct elf_symbol),
|
||
elf_sym_name_compare);
|
||
|
||
for (i = 0; i < count1; i++)
|
||
/* Two symbols must have the same binding, type and name. */
|
||
if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
|
||
|| symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
|
||
|| strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
|
||
goto done;
|
||
|
||
result = TRUE;
|
||
|
||
done:
|
||
if (symtable1)
|
||
free (symtable1);
|
||
if (symtable2)
|
||
free (symtable2);
|
||
if (isymbuf1)
|
||
free (isymbuf1);
|
||
if (isymbuf2)
|
||
free (isymbuf2);
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Return TRUE if 2 section types are compatible. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
|
||
bfd *bbfd, const asection *bsec)
|
||
{
|
||
if (asec == NULL
|
||
|| bsec == NULL
|
||
|| abfd->xvec->flavour != bfd_target_elf_flavour
|
||
|| bbfd->xvec->flavour != bfd_target_elf_flavour)
|
||
return TRUE;
|
||
|
||
return elf_section_type (asec) == elf_section_type (bsec);
|
||
}
|
||
|
||
/* Final phase of ELF linker. */
|
||
|
||
/* A structure we use to avoid passing large numbers of arguments. */
|
||
|
||
struct elf_final_link_info
|
||
{
|
||
/* General link information. */
|
||
struct bfd_link_info *info;
|
||
/* Output BFD. */
|
||
bfd *output_bfd;
|
||
/* Symbol string table. */
|
||
struct elf_strtab_hash *symstrtab;
|
||
/* .dynsym section. */
|
||
asection *dynsym_sec;
|
||
/* .hash section. */
|
||
asection *hash_sec;
|
||
/* symbol version section (.gnu.version). */
|
||
asection *symver_sec;
|
||
/* Buffer large enough to hold contents of any section. */
|
||
bfd_byte *contents;
|
||
/* Buffer large enough to hold external relocs of any section. */
|
||
void *external_relocs;
|
||
/* Buffer large enough to hold internal relocs of any section. */
|
||
Elf_Internal_Rela *internal_relocs;
|
||
/* Buffer large enough to hold external local symbols of any input
|
||
BFD. */
|
||
bfd_byte *external_syms;
|
||
/* And a buffer for symbol section indices. */
|
||
Elf_External_Sym_Shndx *locsym_shndx;
|
||
/* Buffer large enough to hold internal local symbols of any input
|
||
BFD. */
|
||
Elf_Internal_Sym *internal_syms;
|
||
/* Array large enough to hold a symbol index for each local symbol
|
||
of any input BFD. */
|
||
long *indices;
|
||
/* Array large enough to hold a section pointer for each local
|
||
symbol of any input BFD. */
|
||
asection **sections;
|
||
/* Buffer for SHT_SYMTAB_SHNDX section. */
|
||
Elf_External_Sym_Shndx *symshndxbuf;
|
||
/* Number of STT_FILE syms seen. */
|
||
size_t filesym_count;
|
||
};
|
||
|
||
/* This struct is used to pass information to elf_link_output_extsym. */
|
||
|
||
struct elf_outext_info
|
||
{
|
||
bfd_boolean failed;
|
||
bfd_boolean localsyms;
|
||
bfd_boolean file_sym_done;
|
||
struct elf_final_link_info *flinfo;
|
||
};
|
||
|
||
|
||
/* Support for evaluating a complex relocation.
|
||
|
||
Complex relocations are generalized, self-describing relocations. The
|
||
implementation of them consists of two parts: complex symbols, and the
|
||
relocations themselves.
|
||
|
||
The relocations are use a reserved elf-wide relocation type code (R_RELC
|
||
external / BFD_RELOC_RELC internal) and an encoding of relocation field
|
||
information (start bit, end bit, word width, etc) into the addend. This
|
||
information is extracted from CGEN-generated operand tables within gas.
|
||
|
||
Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
|
||
internal) representing prefix-notation expressions, including but not
|
||
limited to those sorts of expressions normally encoded as addends in the
|
||
addend field. The symbol mangling format is:
|
||
|
||
<node> := <literal>
|
||
| <unary-operator> ':' <node>
|
||
| <binary-operator> ':' <node> ':' <node>
|
||
;
|
||
|
||
<literal> := 's' <digits=N> ':' <N character symbol name>
|
||
| 'S' <digits=N> ':' <N character section name>
|
||
| '#' <hexdigits>
|
||
;
|
||
|
||
<binary-operator> := as in C
|
||
<unary-operator> := as in C, plus "0-" for unambiguous negation. */
|
||
|
||
static void
|
||
set_symbol_value (bfd *bfd_with_globals,
|
||
Elf_Internal_Sym *isymbuf,
|
||
size_t locsymcount,
|
||
size_t symidx,
|
||
bfd_vma val)
|
||
{
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry *h;
|
||
size_t extsymoff = locsymcount;
|
||
|
||
if (symidx < locsymcount)
|
||
{
|
||
Elf_Internal_Sym *sym;
|
||
|
||
sym = isymbuf + symidx;
|
||
if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
|
||
{
|
||
/* It is a local symbol: move it to the
|
||
"absolute" section and give it a value. */
|
||
sym->st_shndx = SHN_ABS;
|
||
sym->st_value = val;
|
||
return;
|
||
}
|
||
BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
|
||
extsymoff = 0;
|
||
}
|
||
|
||
/* It is a global symbol: set its link type
|
||
to "defined" and give it a value. */
|
||
|
||
sym_hashes = elf_sym_hashes (bfd_with_globals);
|
||
h = sym_hashes [symidx - extsymoff];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
h->root.type = bfd_link_hash_defined;
|
||
h->root.u.def.value = val;
|
||
h->root.u.def.section = bfd_abs_section_ptr;
|
||
}
|
||
|
||
static bfd_boolean
|
||
resolve_symbol (const char *name,
|
||
bfd *input_bfd,
|
||
struct elf_final_link_info *flinfo,
|
||
bfd_vma *result,
|
||
Elf_Internal_Sym *isymbuf,
|
||
size_t locsymcount)
|
||
{
|
||
Elf_Internal_Sym *sym;
|
||
struct bfd_link_hash_entry *global_entry;
|
||
const char *candidate = NULL;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
size_t i;
|
||
|
||
symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
|
||
|
||
for (i = 0; i < locsymcount; ++ i)
|
||
{
|
||
sym = isymbuf + i;
|
||
|
||
if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
|
||
continue;
|
||
|
||
candidate = bfd_elf_string_from_elf_section (input_bfd,
|
||
symtab_hdr->sh_link,
|
||
sym->st_name);
|
||
#ifdef DEBUG
|
||
printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
|
||
name, candidate, (unsigned long) sym->st_value);
|
||
#endif
|
||
if (candidate && strcmp (candidate, name) == 0)
|
||
{
|
||
asection *sec = flinfo->sections [i];
|
||
|
||
*result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
|
||
*result += sec->output_offset + sec->output_section->vma;
|
||
#ifdef DEBUG
|
||
printf ("Found symbol with value %8.8lx\n",
|
||
(unsigned long) *result);
|
||
#endif
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
/* Hmm, haven't found it yet. perhaps it is a global. */
|
||
global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
|
||
FALSE, FALSE, TRUE);
|
||
if (!global_entry)
|
||
return FALSE;
|
||
|
||
if (global_entry->type == bfd_link_hash_defined
|
||
|| global_entry->type == bfd_link_hash_defweak)
|
||
{
|
||
*result = (global_entry->u.def.value
|
||
+ global_entry->u.def.section->output_section->vma
|
||
+ global_entry->u.def.section->output_offset);
|
||
#ifdef DEBUG
|
||
printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
|
||
global_entry->root.string, (unsigned long) *result);
|
||
#endif
|
||
return TRUE;
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static bfd_boolean
|
||
resolve_section (const char *name,
|
||
asection *sections,
|
||
bfd_vma *result)
|
||
{
|
||
asection *curr;
|
||
unsigned int len;
|
||
|
||
for (curr = sections; curr; curr = curr->next)
|
||
if (strcmp (curr->name, name) == 0)
|
||
{
|
||
*result = curr->vma;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Hmm. still haven't found it. try pseudo-section names. */
|
||
for (curr = sections; curr; curr = curr->next)
|
||
{
|
||
len = strlen (curr->name);
|
||
if (len > strlen (name))
|
||
continue;
|
||
|
||
if (strncmp (curr->name, name, len) == 0)
|
||
{
|
||
if (strncmp (".end", name + len, 4) == 0)
|
||
{
|
||
*result = curr->vma + curr->size;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Insert more pseudo-section names here, if you like. */
|
||
}
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static void
|
||
undefined_reference (const char *reftype, const char *name)
|
||
{
|
||
_bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
|
||
reftype, name);
|
||
}
|
||
|
||
static bfd_boolean
|
||
eval_symbol (bfd_vma *result,
|
||
const char **symp,
|
||
bfd *input_bfd,
|
||
struct elf_final_link_info *flinfo,
|
||
bfd_vma dot,
|
||
Elf_Internal_Sym *isymbuf,
|
||
size_t locsymcount,
|
||
int signed_p)
|
||
{
|
||
size_t len;
|
||
size_t symlen;
|
||
bfd_vma a;
|
||
bfd_vma b;
|
||
char symbuf[4096];
|
||
const char *sym = *symp;
|
||
const char *symend;
|
||
bfd_boolean symbol_is_section = FALSE;
|
||
|
||
len = strlen (sym);
|
||
symend = sym + len;
|
||
|
||
if (len < 1 || len > sizeof (symbuf))
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
}
|
||
|
||
switch (* sym)
|
||
{
|
||
case '.':
|
||
*result = dot;
|
||
*symp = sym + 1;
|
||
return TRUE;
|
||
|
||
case '#':
|
||
++sym;
|
||
*result = strtoul (sym, (char **) symp, 16);
|
||
return TRUE;
|
||
|
||
case 'S':
|
||
symbol_is_section = TRUE;
|
||
case 's':
|
||
++sym;
|
||
symlen = strtol (sym, (char **) symp, 10);
|
||
sym = *symp + 1; /* Skip the trailing ':'. */
|
||
|
||
if (symend < sym || symlen + 1 > sizeof (symbuf))
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
}
|
||
|
||
memcpy (symbuf, sym, symlen);
|
||
symbuf[symlen] = '\0';
|
||
*symp = sym + symlen;
|
||
|
||
/* Is it always possible, with complex symbols, that gas "mis-guessed"
|
||
the symbol as a section, or vice-versa. so we're pretty liberal in our
|
||
interpretation here; section means "try section first", not "must be a
|
||
section", and likewise with symbol. */
|
||
|
||
if (symbol_is_section)
|
||
{
|
||
if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
|
||
&& !resolve_symbol (symbuf, input_bfd, flinfo, result,
|
||
isymbuf, locsymcount))
|
||
{
|
||
undefined_reference ("section", symbuf);
|
||
return FALSE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
|
||
isymbuf, locsymcount)
|
||
&& !resolve_section (symbuf, flinfo->output_bfd->sections,
|
||
result))
|
||
{
|
||
undefined_reference ("symbol", symbuf);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
|
||
/* All that remains are operators. */
|
||
|
||
#define UNARY_OP(op) \
|
||
if (strncmp (sym, #op, strlen (#op)) == 0) \
|
||
{ \
|
||
sym += strlen (#op); \
|
||
if (*sym == ':') \
|
||
++sym; \
|
||
*symp = sym; \
|
||
if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
|
||
isymbuf, locsymcount, signed_p)) \
|
||
return FALSE; \
|
||
if (signed_p) \
|
||
*result = op ((bfd_signed_vma) a); \
|
||
else \
|
||
*result = op a; \
|
||
return TRUE; \
|
||
}
|
||
|
||
#define BINARY_OP(op) \
|
||
if (strncmp (sym, #op, strlen (#op)) == 0) \
|
||
{ \
|
||
sym += strlen (#op); \
|
||
if (*sym == ':') \
|
||
++sym; \
|
||
*symp = sym; \
|
||
if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
|
||
isymbuf, locsymcount, signed_p)) \
|
||
return FALSE; \
|
||
++*symp; \
|
||
if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
|
||
isymbuf, locsymcount, signed_p)) \
|
||
return FALSE; \
|
||
if (signed_p) \
|
||
*result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
|
||
else \
|
||
*result = a op b; \
|
||
return TRUE; \
|
||
}
|
||
|
||
default:
|
||
UNARY_OP (0-);
|
||
BINARY_OP (<<);
|
||
BINARY_OP (>>);
|
||
BINARY_OP (==);
|
||
BINARY_OP (!=);
|
||
BINARY_OP (<=);
|
||
BINARY_OP (>=);
|
||
BINARY_OP (&&);
|
||
BINARY_OP (||);
|
||
UNARY_OP (~);
|
||
UNARY_OP (!);
|
||
BINARY_OP (*);
|
||
BINARY_OP (/);
|
||
BINARY_OP (%);
|
||
BINARY_OP (^);
|
||
BINARY_OP (|);
|
||
BINARY_OP (&);
|
||
BINARY_OP (+);
|
||
BINARY_OP (-);
|
||
BINARY_OP (<);
|
||
BINARY_OP (>);
|
||
#undef UNARY_OP
|
||
#undef BINARY_OP
|
||
_bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
static void
|
||
put_value (bfd_vma size,
|
||
unsigned long chunksz,
|
||
bfd *input_bfd,
|
||
bfd_vma x,
|
||
bfd_byte *location)
|
||
{
|
||
location += (size - chunksz);
|
||
|
||
for (; size; size -= chunksz, location -= chunksz)
|
||
{
|
||
switch (chunksz)
|
||
{
|
||
case 1:
|
||
bfd_put_8 (input_bfd, x, location);
|
||
x >>= 8;
|
||
break;
|
||
case 2:
|
||
bfd_put_16 (input_bfd, x, location);
|
||
x >>= 16;
|
||
break;
|
||
case 4:
|
||
bfd_put_32 (input_bfd, x, location);
|
||
/* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
|
||
x >>= 16;
|
||
x >>= 16;
|
||
break;
|
||
#ifdef BFD64
|
||
case 8:
|
||
bfd_put_64 (input_bfd, x, location);
|
||
/* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
|
||
x >>= 32;
|
||
x >>= 32;
|
||
break;
|
||
#endif
|
||
default:
|
||
abort ();
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
static bfd_vma
|
||
get_value (bfd_vma size,
|
||
unsigned long chunksz,
|
||
bfd *input_bfd,
|
||
bfd_byte *location)
|
||
{
|
||
int shift;
|
||
bfd_vma x = 0;
|
||
|
||
/* Sanity checks. */
|
||
BFD_ASSERT (chunksz <= sizeof (x)
|
||
&& size >= chunksz
|
||
&& chunksz != 0
|
||
&& (size % chunksz) == 0
|
||
&& input_bfd != NULL
|
||
&& location != NULL);
|
||
|
||
if (chunksz == sizeof (x))
|
||
{
|
||
BFD_ASSERT (size == chunksz);
|
||
|
||
/* Make sure that we do not perform an undefined shift operation.
|
||
We know that size == chunksz so there will only be one iteration
|
||
of the loop below. */
|
||
shift = 0;
|
||
}
|
||
else
|
||
shift = 8 * chunksz;
|
||
|
||
for (; size; size -= chunksz, location += chunksz)
|
||
{
|
||
switch (chunksz)
|
||
{
|
||
case 1:
|
||
x = (x << shift) | bfd_get_8 (input_bfd, location);
|
||
break;
|
||
case 2:
|
||
x = (x << shift) | bfd_get_16 (input_bfd, location);
|
||
break;
|
||
case 4:
|
||
x = (x << shift) | bfd_get_32 (input_bfd, location);
|
||
break;
|
||
#ifdef BFD64
|
||
case 8:
|
||
x = (x << shift) | bfd_get_64 (input_bfd, location);
|
||
break;
|
||
#endif
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
return x;
|
||
}
|
||
|
||
static void
|
||
decode_complex_addend (unsigned long *start, /* in bits */
|
||
unsigned long *oplen, /* in bits */
|
||
unsigned long *len, /* in bits */
|
||
unsigned long *wordsz, /* in bytes */
|
||
unsigned long *chunksz, /* in bytes */
|
||
unsigned long *lsb0_p,
|
||
unsigned long *signed_p,
|
||
unsigned long *trunc_p,
|
||
unsigned long encoded)
|
||
{
|
||
* start = encoded & 0x3F;
|
||
* len = (encoded >> 6) & 0x3F;
|
||
* oplen = (encoded >> 12) & 0x3F;
|
||
* wordsz = (encoded >> 18) & 0xF;
|
||
* chunksz = (encoded >> 22) & 0xF;
|
||
* lsb0_p = (encoded >> 27) & 1;
|
||
* signed_p = (encoded >> 28) & 1;
|
||
* trunc_p = (encoded >> 29) & 1;
|
||
}
|
||
|
||
bfd_reloc_status_type
|
||
bfd_elf_perform_complex_relocation (bfd *input_bfd,
|
||
asection *input_section ATTRIBUTE_UNUSED,
|
||
bfd_byte *contents,
|
||
Elf_Internal_Rela *rel,
|
||
bfd_vma relocation)
|
||
{
|
||
bfd_vma shift, x, mask;
|
||
unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
|
||
bfd_reloc_status_type r;
|
||
|
||
/* Perform this reloc, since it is complex.
|
||
(this is not to say that it necessarily refers to a complex
|
||
symbol; merely that it is a self-describing CGEN based reloc.
|
||
i.e. the addend has the complete reloc information (bit start, end,
|
||
word size, etc) encoded within it.). */
|
||
|
||
decode_complex_addend (&start, &oplen, &len, &wordsz,
|
||
&chunksz, &lsb0_p, &signed_p,
|
||
&trunc_p, rel->r_addend);
|
||
|
||
mask = (((1L << (len - 1)) - 1) << 1) | 1;
|
||
|
||
if (lsb0_p)
|
||
shift = (start + 1) - len;
|
||
else
|
||
shift = (8 * wordsz) - (start + len);
|
||
|
||
/* FIXME: octets_per_byte. */
|
||
x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
|
||
|
||
#ifdef DEBUG
|
||
printf ("Doing complex reloc: "
|
||
"lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
|
||
"chunksz %ld, start %ld, len %ld, oplen %ld\n"
|
||
" dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
|
||
lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
|
||
oplen, (unsigned long) x, (unsigned long) mask,
|
||
(unsigned long) relocation);
|
||
#endif
|
||
|
||
r = bfd_reloc_ok;
|
||
if (! trunc_p)
|
||
/* Now do an overflow check. */
|
||
r = bfd_check_overflow ((signed_p
|
||
? complain_overflow_signed
|
||
: complain_overflow_unsigned),
|
||
len, 0, (8 * wordsz),
|
||
relocation);
|
||
|
||
/* Do the deed. */
|
||
x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
|
||
|
||
#ifdef DEBUG
|
||
printf (" relocation: %8.8lx\n"
|
||
" shifted mask: %8.8lx\n"
|
||
" shifted/masked reloc: %8.8lx\n"
|
||
" result: %8.8lx\n",
|
||
(unsigned long) relocation, (unsigned long) (mask << shift),
|
||
(unsigned long) ((relocation & mask) << shift), (unsigned long) x);
|
||
#endif
|
||
/* FIXME: octets_per_byte. */
|
||
put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
|
||
return r;
|
||
}
|
||
|
||
/* qsort comparison functions sorting external relocs by r_offset. */
|
||
|
||
static int
|
||
cmp_ext32l_r_offset (const void *p, const void *q)
|
||
{
|
||
union aligned32
|
||
{
|
||
uint32_t v;
|
||
unsigned char c[4];
|
||
};
|
||
const union aligned32 *a
|
||
= (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
|
||
const union aligned32 *b
|
||
= (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
|
||
|
||
uint32_t aval = ( (uint32_t) a->c[0]
|
||
| (uint32_t) a->c[1] << 8
|
||
| (uint32_t) a->c[2] << 16
|
||
| (uint32_t) a->c[3] << 24);
|
||
uint32_t bval = ( (uint32_t) b->c[0]
|
||
| (uint32_t) b->c[1] << 8
|
||
| (uint32_t) b->c[2] << 16
|
||
| (uint32_t) b->c[3] << 24);
|
||
if (aval < bval)
|
||
return -1;
|
||
else if (aval > bval)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
cmp_ext32b_r_offset (const void *p, const void *q)
|
||
{
|
||
union aligned32
|
||
{
|
||
uint32_t v;
|
||
unsigned char c[4];
|
||
};
|
||
const union aligned32 *a
|
||
= (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
|
||
const union aligned32 *b
|
||
= (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
|
||
|
||
uint32_t aval = ( (uint32_t) a->c[0] << 24
|
||
| (uint32_t) a->c[1] << 16
|
||
| (uint32_t) a->c[2] << 8
|
||
| (uint32_t) a->c[3]);
|
||
uint32_t bval = ( (uint32_t) b->c[0] << 24
|
||
| (uint32_t) b->c[1] << 16
|
||
| (uint32_t) b->c[2] << 8
|
||
| (uint32_t) b->c[3]);
|
||
if (aval < bval)
|
||
return -1;
|
||
else if (aval > bval)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
#ifdef BFD_HOST_64_BIT
|
||
static int
|
||
cmp_ext64l_r_offset (const void *p, const void *q)
|
||
{
|
||
union aligned64
|
||
{
|
||
uint64_t v;
|
||
unsigned char c[8];
|
||
};
|
||
const union aligned64 *a
|
||
= (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
|
||
const union aligned64 *b
|
||
= (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
|
||
|
||
uint64_t aval = ( (uint64_t) a->c[0]
|
||
| (uint64_t) a->c[1] << 8
|
||
| (uint64_t) a->c[2] << 16
|
||
| (uint64_t) a->c[3] << 24
|
||
| (uint64_t) a->c[4] << 32
|
||
| (uint64_t) a->c[5] << 40
|
||
| (uint64_t) a->c[6] << 48
|
||
| (uint64_t) a->c[7] << 56);
|
||
uint64_t bval = ( (uint64_t) b->c[0]
|
||
| (uint64_t) b->c[1] << 8
|
||
| (uint64_t) b->c[2] << 16
|
||
| (uint64_t) b->c[3] << 24
|
||
| (uint64_t) b->c[4] << 32
|
||
| (uint64_t) b->c[5] << 40
|
||
| (uint64_t) b->c[6] << 48
|
||
| (uint64_t) b->c[7] << 56);
|
||
if (aval < bval)
|
||
return -1;
|
||
else if (aval > bval)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
cmp_ext64b_r_offset (const void *p, const void *q)
|
||
{
|
||
union aligned64
|
||
{
|
||
uint64_t v;
|
||
unsigned char c[8];
|
||
};
|
||
const union aligned64 *a
|
||
= (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
|
||
const union aligned64 *b
|
||
= (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
|
||
|
||
uint64_t aval = ( (uint64_t) a->c[0] << 56
|
||
| (uint64_t) a->c[1] << 48
|
||
| (uint64_t) a->c[2] << 40
|
||
| (uint64_t) a->c[3] << 32
|
||
| (uint64_t) a->c[4] << 24
|
||
| (uint64_t) a->c[5] << 16
|
||
| (uint64_t) a->c[6] << 8
|
||
| (uint64_t) a->c[7]);
|
||
uint64_t bval = ( (uint64_t) b->c[0] << 56
|
||
| (uint64_t) b->c[1] << 48
|
||
| (uint64_t) b->c[2] << 40
|
||
| (uint64_t) b->c[3] << 32
|
||
| (uint64_t) b->c[4] << 24
|
||
| (uint64_t) b->c[5] << 16
|
||
| (uint64_t) b->c[6] << 8
|
||
| (uint64_t) b->c[7]);
|
||
if (aval < bval)
|
||
return -1;
|
||
else if (aval > bval)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
/* When performing a relocatable link, the input relocations are
|
||
preserved. But, if they reference global symbols, the indices
|
||
referenced must be updated. Update all the relocations found in
|
||
RELDATA. */
|
||
|
||
static void
|
||
elf_link_adjust_relocs (bfd *abfd,
|
||
struct bfd_elf_section_reloc_data *reldata,
|
||
bfd_boolean sort)
|
||
{
|
||
unsigned int i;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_byte *erela;
|
||
void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
bfd_vma r_type_mask;
|
||
int r_sym_shift;
|
||
unsigned int count = reldata->count;
|
||
struct elf_link_hash_entry **rel_hash = reldata->hashes;
|
||
|
||
if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
|
||
{
|
||
swap_in = bed->s->swap_reloc_in;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
|
||
{
|
||
swap_in = bed->s->swap_reloca_in;
|
||
swap_out = bed->s->swap_reloca_out;
|
||
}
|
||
else
|
||
abort ();
|
||
|
||
if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
|
||
abort ();
|
||
|
||
if (bed->s->arch_size == 32)
|
||
{
|
||
r_type_mask = 0xff;
|
||
r_sym_shift = 8;
|
||
}
|
||
else
|
||
{
|
||
r_type_mask = 0xffffffff;
|
||
r_sym_shift = 32;
|
||
}
|
||
|
||
erela = reldata->hdr->contents;
|
||
for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
|
||
{
|
||
Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
|
||
unsigned int j;
|
||
|
||
if (*rel_hash == NULL)
|
||
continue;
|
||
|
||
BFD_ASSERT ((*rel_hash)->indx >= 0);
|
||
|
||
(*swap_in) (abfd, erela, irela);
|
||
for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
|
||
irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
|
||
| (irela[j].r_info & r_type_mask));
|
||
(*swap_out) (abfd, irela, erela);
|
||
}
|
||
|
||
if (sort)
|
||
{
|
||
int (*compare) (const void *, const void *);
|
||
|
||
if (bed->s->arch_size == 32)
|
||
{
|
||
if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
|
||
compare = cmp_ext32l_r_offset;
|
||
else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
|
||
compare = cmp_ext32b_r_offset;
|
||
else
|
||
abort ();
|
||
}
|
||
else
|
||
{
|
||
#ifdef BFD_HOST_64_BIT
|
||
if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
|
||
compare = cmp_ext64l_r_offset;
|
||
else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
|
||
compare = cmp_ext64b_r_offset;
|
||
else
|
||
#endif
|
||
abort ();
|
||
}
|
||
qsort (reldata->hdr->contents, count, reldata->hdr->sh_entsize, compare);
|
||
free (reldata->hashes);
|
||
reldata->hashes = NULL;
|
||
}
|
||
}
|
||
|
||
struct elf_link_sort_rela
|
||
{
|
||
union {
|
||
bfd_vma offset;
|
||
bfd_vma sym_mask;
|
||
} u;
|
||
enum elf_reloc_type_class type;
|
||
/* We use this as an array of size int_rels_per_ext_rel. */
|
||
Elf_Internal_Rela rela[1];
|
||
};
|
||
|
||
static int
|
||
elf_link_sort_cmp1 (const void *A, const void *B)
|
||
{
|
||
const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
|
||
const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
|
||
int relativea, relativeb;
|
||
|
||
relativea = a->type == reloc_class_relative;
|
||
relativeb = b->type == reloc_class_relative;
|
||
|
||
if (relativea < relativeb)
|
||
return 1;
|
||
if (relativea > relativeb)
|
||
return -1;
|
||
if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
|
||
return -1;
|
||
if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
|
||
return 1;
|
||
if (a->rela->r_offset < b->rela->r_offset)
|
||
return -1;
|
||
if (a->rela->r_offset > b->rela->r_offset)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
elf_link_sort_cmp2 (const void *A, const void *B)
|
||
{
|
||
const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
|
||
const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
|
||
|
||
if (a->type < b->type)
|
||
return -1;
|
||
if (a->type > b->type)
|
||
return 1;
|
||
if (a->u.offset < b->u.offset)
|
||
return -1;
|
||
if (a->u.offset > b->u.offset)
|
||
return 1;
|
||
if (a->rela->r_offset < b->rela->r_offset)
|
||
return -1;
|
||
if (a->rela->r_offset > b->rela->r_offset)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static size_t
|
||
elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
|
||
{
|
||
asection *dynamic_relocs;
|
||
asection *rela_dyn;
|
||
asection *rel_dyn;
|
||
bfd_size_type count, size;
|
||
size_t i, ret, sort_elt, ext_size;
|
||
bfd_byte *sort, *s_non_relative, *p;
|
||
struct elf_link_sort_rela *sq;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
int i2e = bed->s->int_rels_per_ext_rel;
|
||
void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
struct bfd_link_order *lo;
|
||
bfd_vma r_sym_mask;
|
||
bfd_boolean use_rela;
|
||
|
||
/* Find a dynamic reloc section. */
|
||
rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
|
||
rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
|
||
if (rela_dyn != NULL && rela_dyn->size > 0
|
||
&& rel_dyn != NULL && rel_dyn->size > 0)
|
||
{
|
||
bfd_boolean use_rela_initialised = FALSE;
|
||
|
||
/* This is just here to stop gcc from complaining.
|
||
It's initialization checking code is not perfect. */
|
||
use_rela = TRUE;
|
||
|
||
/* Both sections are present. Examine the sizes
|
||
of the indirect sections to help us choose. */
|
||
for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
asection *o = lo->u.indirect.section;
|
||
|
||
if ((o->size % bed->s->sizeof_rela) == 0)
|
||
{
|
||
if ((o->size % bed->s->sizeof_rel) == 0)
|
||
/* Section size is divisible by both rel and rela sizes.
|
||
It is of no help to us. */
|
||
;
|
||
else
|
||
{
|
||
/* Section size is only divisible by rela. */
|
||
if (use_rela_initialised && (use_rela == FALSE))
|
||
{
|
||
_bfd_error_handler
|
||
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
use_rela = TRUE;
|
||
use_rela_initialised = TRUE;
|
||
}
|
||
}
|
||
}
|
||
else if ((o->size % bed->s->sizeof_rel) == 0)
|
||
{
|
||
/* Section size is only divisible by rel. */
|
||
if (use_rela_initialised && (use_rela == TRUE))
|
||
{
|
||
_bfd_error_handler
|
||
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
use_rela = FALSE;
|
||
use_rela_initialised = TRUE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* The section size is not divisible by either - something is wrong. */
|
||
_bfd_error_handler
|
||
(_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
asection *o = lo->u.indirect.section;
|
||
|
||
if ((o->size % bed->s->sizeof_rela) == 0)
|
||
{
|
||
if ((o->size % bed->s->sizeof_rel) == 0)
|
||
/* Section size is divisible by both rel and rela sizes.
|
||
It is of no help to us. */
|
||
;
|
||
else
|
||
{
|
||
/* Section size is only divisible by rela. */
|
||
if (use_rela_initialised && (use_rela == FALSE))
|
||
{
|
||
_bfd_error_handler
|
||
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
use_rela = TRUE;
|
||
use_rela_initialised = TRUE;
|
||
}
|
||
}
|
||
}
|
||
else if ((o->size % bed->s->sizeof_rel) == 0)
|
||
{
|
||
/* Section size is only divisible by rel. */
|
||
if (use_rela_initialised && (use_rela == TRUE))
|
||
{
|
||
_bfd_error_handler
|
||
(_("%B: Unable to sort relocs - they are in more than one size"), abfd);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
use_rela = FALSE;
|
||
use_rela_initialised = TRUE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* The section size is not divisible by either - something is wrong. */
|
||
_bfd_error_handler
|
||
(_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (! use_rela_initialised)
|
||
/* Make a guess. */
|
||
use_rela = TRUE;
|
||
}
|
||
else if (rela_dyn != NULL && rela_dyn->size > 0)
|
||
use_rela = TRUE;
|
||
else if (rel_dyn != NULL && rel_dyn->size > 0)
|
||
use_rela = FALSE;
|
||
else
|
||
return 0;
|
||
|
||
if (use_rela)
|
||
{
|
||
dynamic_relocs = rela_dyn;
|
||
ext_size = bed->s->sizeof_rela;
|
||
swap_in = bed->s->swap_reloca_in;
|
||
swap_out = bed->s->swap_reloca_out;
|
||
}
|
||
else
|
||
{
|
||
dynamic_relocs = rel_dyn;
|
||
ext_size = bed->s->sizeof_rel;
|
||
swap_in = bed->s->swap_reloc_in;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
|
||
size = 0;
|
||
for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
size += lo->u.indirect.section->size;
|
||
|
||
if (size != dynamic_relocs->size)
|
||
return 0;
|
||
|
||
sort_elt = (sizeof (struct elf_link_sort_rela)
|
||
+ (i2e - 1) * sizeof (Elf_Internal_Rela));
|
||
|
||
count = dynamic_relocs->size / ext_size;
|
||
if (count == 0)
|
||
return 0;
|
||
sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
|
||
|
||
if (sort == NULL)
|
||
{
|
||
(*info->callbacks->warning)
|
||
(info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
|
||
return 0;
|
||
}
|
||
|
||
if (bed->s->arch_size == 32)
|
||
r_sym_mask = ~(bfd_vma) 0xff;
|
||
else
|
||
r_sym_mask = ~(bfd_vma) 0xffffffff;
|
||
|
||
for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
bfd_byte *erel, *erelend;
|
||
asection *o = lo->u.indirect.section;
|
||
|
||
if (o->contents == NULL && o->size != 0)
|
||
{
|
||
/* This is a reloc section that is being handled as a normal
|
||
section. See bfd_section_from_shdr. We can't combine
|
||
relocs in this case. */
|
||
free (sort);
|
||
return 0;
|
||
}
|
||
erel = o->contents;
|
||
erelend = o->contents + o->size;
|
||
/* FIXME: octets_per_byte. */
|
||
p = sort + o->output_offset / ext_size * sort_elt;
|
||
|
||
while (erel < erelend)
|
||
{
|
||
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
|
||
|
||
(*swap_in) (abfd, erel, s->rela);
|
||
s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
|
||
s->u.sym_mask = r_sym_mask;
|
||
p += sort_elt;
|
||
erel += ext_size;
|
||
}
|
||
}
|
||
|
||
qsort (sort, count, sort_elt, elf_link_sort_cmp1);
|
||
|
||
for (i = 0, p = sort; i < count; i++, p += sort_elt)
|
||
{
|
||
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
|
||
if (s->type != reloc_class_relative)
|
||
break;
|
||
}
|
||
ret = i;
|
||
s_non_relative = p;
|
||
|
||
sq = (struct elf_link_sort_rela *) s_non_relative;
|
||
for (; i < count; i++, p += sort_elt)
|
||
{
|
||
struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
|
||
if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
|
||
sq = sp;
|
||
sp->u.offset = sq->rela->r_offset;
|
||
}
|
||
|
||
qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
|
||
|
||
for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
bfd_byte *erel, *erelend;
|
||
asection *o = lo->u.indirect.section;
|
||
|
||
erel = o->contents;
|
||
erelend = o->contents + o->size;
|
||
/* FIXME: octets_per_byte. */
|
||
p = sort + o->output_offset / ext_size * sort_elt;
|
||
while (erel < erelend)
|
||
{
|
||
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
|
||
(*swap_out) (abfd, s->rela, erel);
|
||
p += sort_elt;
|
||
erel += ext_size;
|
||
}
|
||
}
|
||
|
||
free (sort);
|
||
*psec = dynamic_relocs;
|
||
return ret;
|
||
}
|
||
|
||
/* Add a symbol to the output symbol string table. */
|
||
|
||
static int
|
||
elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
|
||
const char *name,
|
||
Elf_Internal_Sym *elfsym,
|
||
asection *input_sec,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
int (*output_symbol_hook)
|
||
(struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
|
||
struct elf_link_hash_entry *);
|
||
struct elf_link_hash_table *hash_table;
|
||
const struct elf_backend_data *bed;
|
||
bfd_size_type strtabsize;
|
||
|
||
BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
|
||
|
||
bed = get_elf_backend_data (flinfo->output_bfd);
|
||
output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
|
||
if (output_symbol_hook != NULL)
|
||
{
|
||
int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
|
||
if (ret != 1)
|
||
return ret;
|
||
}
|
||
|
||
if (name == NULL
|
||
|| *name == '\0'
|
||
|| (input_sec->flags & SEC_EXCLUDE))
|
||
elfsym->st_name = (unsigned long) -1;
|
||
else
|
||
{
|
||
/* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
|
||
to get the final offset for st_name. */
|
||
elfsym->st_name
|
||
= (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
|
||
name, FALSE);
|
||
if (elfsym->st_name == (unsigned long) -1)
|
||
return 0;
|
||
}
|
||
|
||
hash_table = elf_hash_table (flinfo->info);
|
||
strtabsize = hash_table->strtabsize;
|
||
if (strtabsize <= hash_table->strtabcount)
|
||
{
|
||
strtabsize += strtabsize;
|
||
hash_table->strtabsize = strtabsize;
|
||
strtabsize *= sizeof (*hash_table->strtab);
|
||
hash_table->strtab
|
||
= (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
|
||
strtabsize);
|
||
if (hash_table->strtab == NULL)
|
||
return 0;
|
||
}
|
||
hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
|
||
hash_table->strtab[hash_table->strtabcount].dest_index
|
||
= hash_table->strtabcount;
|
||
hash_table->strtab[hash_table->strtabcount].destshndx_index
|
||
= flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
|
||
|
||
bfd_get_symcount (flinfo->output_bfd) += 1;
|
||
hash_table->strtabcount += 1;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Swap symbols out to the symbol table and flush the output symbols to
|
||
the file. */
|
||
|
||
static bfd_boolean
|
||
elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
|
||
{
|
||
struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
|
||
bfd_size_type amt, i;
|
||
const struct elf_backend_data *bed;
|
||
bfd_byte *symbuf;
|
||
Elf_Internal_Shdr *hdr;
|
||
file_ptr pos;
|
||
bfd_boolean ret;
|
||
|
||
if (!hash_table->strtabcount)
|
||
return TRUE;
|
||
|
||
BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
|
||
|
||
bed = get_elf_backend_data (flinfo->output_bfd);
|
||
|
||
amt = bed->s->sizeof_sym * hash_table->strtabcount;
|
||
symbuf = (bfd_byte *) bfd_malloc (amt);
|
||
if (symbuf == NULL)
|
||
return FALSE;
|
||
|
||
if (flinfo->symshndxbuf)
|
||
{
|
||
amt = (sizeof (Elf_External_Sym_Shndx)
|
||
* (bfd_get_symcount (flinfo->output_bfd)));
|
||
flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
|
||
if (flinfo->symshndxbuf == NULL)
|
||
{
|
||
free (symbuf);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
for (i = 0; i < hash_table->strtabcount; i++)
|
||
{
|
||
struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
|
||
if (elfsym->sym.st_name == (unsigned long) -1)
|
||
elfsym->sym.st_name = 0;
|
||
else
|
||
elfsym->sym.st_name
|
||
= (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
|
||
elfsym->sym.st_name);
|
||
bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
|
||
((bfd_byte *) symbuf
|
||
+ (elfsym->dest_index
|
||
* bed->s->sizeof_sym)),
|
||
(flinfo->symshndxbuf
|
||
+ elfsym->destshndx_index));
|
||
}
|
||
|
||
hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
|
||
pos = hdr->sh_offset + hdr->sh_size;
|
||
amt = hash_table->strtabcount * bed->s->sizeof_sym;
|
||
if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
|
||
&& bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
|
||
{
|
||
hdr->sh_size += amt;
|
||
ret = TRUE;
|
||
}
|
||
else
|
||
ret = FALSE;
|
||
|
||
free (symbuf);
|
||
|
||
free (hash_table->strtab);
|
||
hash_table->strtab = NULL;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
|
||
|
||
static bfd_boolean
|
||
check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
|
||
{
|
||
if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
|
||
&& sym->st_shndx < SHN_LORESERVE)
|
||
{
|
||
/* The gABI doesn't support dynamic symbols in output sections
|
||
beyond 64k. */
|
||
(*_bfd_error_handler)
|
||
(_("%B: Too many sections: %d (>= %d)"),
|
||
abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
|
||
bfd_set_error (bfd_error_nonrepresentable_section);
|
||
return FALSE;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
|
||
allowing an unsatisfied unversioned symbol in the DSO to match a
|
||
versioned symbol that would normally require an explicit version.
|
||
We also handle the case that a DSO references a hidden symbol
|
||
which may be satisfied by a versioned symbol in another DSO. */
|
||
|
||
static bfd_boolean
|
||
elf_link_check_versioned_symbol (struct bfd_link_info *info,
|
||
const struct elf_backend_data *bed,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
bfd *abfd;
|
||
struct elf_link_loaded_list *loaded;
|
||
|
||
if (!is_elf_hash_table (info->hash))
|
||
return FALSE;
|
||
|
||
/* Check indirect symbol. */
|
||
while (h->root.type == bfd_link_hash_indirect)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
abfd = NULL;
|
||
break;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
abfd = h->root.u.undef.abfd;
|
||
if ((abfd->flags & DYNAMIC) == 0
|
||
|| (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
|
||
return FALSE;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
abfd = h->root.u.def.section->owner;
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
abfd = h->root.u.c.p->section->owner;
|
||
break;
|
||
}
|
||
BFD_ASSERT (abfd != NULL);
|
||
|
||
for (loaded = elf_hash_table (info)->loaded;
|
||
loaded != NULL;
|
||
loaded = loaded->next)
|
||
{
|
||
bfd *input;
|
||
Elf_Internal_Shdr *hdr;
|
||
bfd_size_type symcount;
|
||
bfd_size_type extsymcount;
|
||
bfd_size_type extsymoff;
|
||
Elf_Internal_Shdr *versymhdr;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
Elf_Internal_Sym *isymbuf;
|
||
Elf_External_Versym *ever;
|
||
Elf_External_Versym *extversym;
|
||
|
||
input = loaded->abfd;
|
||
|
||
/* We check each DSO for a possible hidden versioned definition. */
|
||
if (input == abfd
|
||
|| (input->flags & DYNAMIC) == 0
|
||
|| elf_dynversym (input) == 0)
|
||
continue;
|
||
|
||
hdr = &elf_tdata (input)->dynsymtab_hdr;
|
||
|
||
symcount = hdr->sh_size / bed->s->sizeof_sym;
|
||
if (elf_bad_symtab (input))
|
||
{
|
||
extsymcount = symcount;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
extsymcount = symcount - hdr->sh_info;
|
||
extsymoff = hdr->sh_info;
|
||
}
|
||
|
||
if (extsymcount == 0)
|
||
continue;
|
||
|
||
isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
return FALSE;
|
||
|
||
/* Read in any version definitions. */
|
||
versymhdr = &elf_tdata (input)->dynversym_hdr;
|
||
extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
|
||
if (extversym == NULL)
|
||
goto error_ret;
|
||
|
||
if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_bread (extversym, versymhdr->sh_size, input)
|
||
!= versymhdr->sh_size))
|
||
{
|
||
free (extversym);
|
||
error_ret:
|
||
free (isymbuf);
|
||
return FALSE;
|
||
}
|
||
|
||
ever = extversym + extsymoff;
|
||
isymend = isymbuf + extsymcount;
|
||
for (isym = isymbuf; isym < isymend; isym++, ever++)
|
||
{
|
||
const char *name;
|
||
Elf_Internal_Versym iver;
|
||
unsigned short version_index;
|
||
|
||
if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
|
||
|| isym->st_shndx == SHN_UNDEF)
|
||
continue;
|
||
|
||
name = bfd_elf_string_from_elf_section (input,
|
||
hdr->sh_link,
|
||
isym->st_name);
|
||
if (strcmp (name, h->root.root.string) != 0)
|
||
continue;
|
||
|
||
_bfd_elf_swap_versym_in (input, ever, &iver);
|
||
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
|
||
&& !(h->def_regular
|
||
&& h->forced_local))
|
||
{
|
||
/* If we have a non-hidden versioned sym, then it should
|
||
have provided a definition for the undefined sym unless
|
||
it is defined in a non-shared object and forced local.
|
||
*/
|
||
abort ();
|
||
}
|
||
|
||
version_index = iver.vs_vers & VERSYM_VERSION;
|
||
if (version_index == 1 || version_index == 2)
|
||
{
|
||
/* This is the base or first version. We can use it. */
|
||
free (extversym);
|
||
free (isymbuf);
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
free (extversym);
|
||
free (isymbuf);
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Add an external symbol to the symbol table. This is called from
|
||
the hash table traversal routine. When generating a shared object,
|
||
we go through the symbol table twice. The first time we output
|
||
anything that might have been forced to local scope in a version
|
||
script. The second time we output the symbols that are still
|
||
global symbols. */
|
||
|
||
static bfd_boolean
|
||
elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
|
||
{
|
||
struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
|
||
struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
|
||
struct elf_final_link_info *flinfo = eoinfo->flinfo;
|
||
bfd_boolean strip;
|
||
Elf_Internal_Sym sym;
|
||
asection *input_sec;
|
||
const struct elf_backend_data *bed;
|
||
long indx;
|
||
int ret;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
{
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
if (h->root.type == bfd_link_hash_new)
|
||
return TRUE;
|
||
}
|
||
|
||
/* Decide whether to output this symbol in this pass. */
|
||
if (eoinfo->localsyms)
|
||
{
|
||
if (!h->forced_local)
|
||
return TRUE;
|
||
}
|
||
else
|
||
{
|
||
if (h->forced_local)
|
||
return TRUE;
|
||
}
|
||
|
||
bed = get_elf_backend_data (flinfo->output_bfd);
|
||
|
||
if (h->root.type == bfd_link_hash_undefined)
|
||
{
|
||
/* If we have an undefined symbol reference here then it must have
|
||
come from a shared library that is being linked in. (Undefined
|
||
references in regular files have already been handled unless
|
||
they are in unreferenced sections which are removed by garbage
|
||
collection). */
|
||
bfd_boolean ignore_undef = FALSE;
|
||
|
||
/* Some symbols may be special in that the fact that they're
|
||
undefined can be safely ignored - let backend determine that. */
|
||
if (bed->elf_backend_ignore_undef_symbol)
|
||
ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
|
||
|
||
/* If we are reporting errors for this situation then do so now. */
|
||
if (!ignore_undef
|
||
&& h->ref_dynamic
|
||
&& (!h->ref_regular || flinfo->info->gc_sections)
|
||
&& !elf_link_check_versioned_symbol (flinfo->info, bed, h)
|
||
&& flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
|
||
{
|
||
if (!(flinfo->info->callbacks->undefined_symbol
|
||
(flinfo->info, h->root.root.string,
|
||
h->ref_regular ? NULL : h->root.u.undef.abfd,
|
||
NULL, 0,
|
||
(flinfo->info->unresolved_syms_in_shared_libs
|
||
== RM_GENERATE_ERROR))))
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We should also warn if a forced local symbol is referenced from
|
||
shared libraries. */
|
||
if (!flinfo->info->relocatable
|
||
&& flinfo->info->executable
|
||
&& h->forced_local
|
||
&& h->ref_dynamic
|
||
&& h->def_regular
|
||
&& !h->dynamic_def
|
||
&& h->ref_dynamic_nonweak
|
||
&& !elf_link_check_versioned_symbol (flinfo->info, bed, h))
|
||
{
|
||
bfd *def_bfd;
|
||
const char *msg;
|
||
struct elf_link_hash_entry *hi = h;
|
||
|
||
/* Check indirect symbol. */
|
||
while (hi->root.type == bfd_link_hash_indirect)
|
||
hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
|
||
|
||
if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
|
||
msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
|
||
else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
|
||
msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
|
||
else
|
||
msg = _("%B: local symbol `%s' in %B is referenced by DSO");
|
||
def_bfd = flinfo->output_bfd;
|
||
if (hi->root.u.def.section != bfd_abs_section_ptr)
|
||
def_bfd = hi->root.u.def.section->owner;
|
||
(*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
|
||
h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* We don't want to output symbols that have never been mentioned by
|
||
a regular file, or that we have been told to strip. However, if
|
||
h->indx is set to -2, the symbol is used by a reloc and we must
|
||
output it. */
|
||
strip = FALSE;
|
||
if (h->indx == -2)
|
||
;
|
||
else if ((h->def_dynamic
|
||
|| h->ref_dynamic
|
||
|| h->root.type == bfd_link_hash_new)
|
||
&& !h->def_regular
|
||
&& !h->ref_regular)
|
||
strip = TRUE;
|
||
else if (flinfo->info->strip == strip_all)
|
||
strip = TRUE;
|
||
else if (flinfo->info->strip == strip_some
|
||
&& bfd_hash_lookup (flinfo->info->keep_hash,
|
||
h->root.root.string, FALSE, FALSE) == NULL)
|
||
strip = TRUE;
|
||
else if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& ((flinfo->info->strip_discarded
|
||
&& discarded_section (h->root.u.def.section))
|
||
|| ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
|
||
&& h->root.u.def.section->owner != NULL
|
||
&& (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
|
||
strip = TRUE;
|
||
else if ((h->root.type == bfd_link_hash_undefined
|
||
|| h->root.type == bfd_link_hash_undefweak)
|
||
&& h->root.u.undef.abfd != NULL
|
||
&& (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
|
||
strip = TRUE;
|
||
|
||
/* If we're stripping it, and it's not a dynamic symbol, there's
|
||
nothing else to do. However, if it is a forced local symbol or
|
||
an ifunc symbol we need to give the backend finish_dynamic_symbol
|
||
function a chance to make it dynamic. */
|
||
if (strip
|
||
&& h->dynindx == -1
|
||
&& h->type != STT_GNU_IFUNC
|
||
&& !h->forced_local)
|
||
return TRUE;
|
||
|
||
sym.st_value = 0;
|
||
sym.st_size = h->size;
|
||
sym.st_other = h->other;
|
||
if (h->forced_local)
|
||
{
|
||
sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
|
||
/* Turn off visibility on local symbol. */
|
||
sym.st_other &= ~ELF_ST_VISIBILITY (-1);
|
||
}
|
||
/* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
|
||
else if (h->unique_global && h->def_regular)
|
||
sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
|
||
else if (h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
|
||
else
|
||
sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
|
||
sym.st_target_internal = h->target_internal;
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
case bfd_link_hash_new:
|
||
case bfd_link_hash_warning:
|
||
abort ();
|
||
return FALSE;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
input_sec = bfd_und_section_ptr;
|
||
sym.st_shndx = SHN_UNDEF;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
{
|
||
input_sec = h->root.u.def.section;
|
||
if (input_sec->output_section != NULL)
|
||
{
|
||
sym.st_shndx =
|
||
_bfd_elf_section_from_bfd_section (flinfo->output_bfd,
|
||
input_sec->output_section);
|
||
if (sym.st_shndx == SHN_BAD)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: could not find output section %A for input section %A"),
|
||
flinfo->output_bfd, input_sec->output_section, input_sec);
|
||
bfd_set_error (bfd_error_nonrepresentable_section);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* ELF symbols in relocatable files are section relative,
|
||
but in nonrelocatable files they are virtual
|
||
addresses. */
|
||
sym.st_value = h->root.u.def.value + input_sec->output_offset;
|
||
if (!flinfo->info->relocatable)
|
||
{
|
||
sym.st_value += input_sec->output_section->vma;
|
||
if (h->type == STT_TLS)
|
||
{
|
||
asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
|
||
if (tls_sec != NULL)
|
||
sym.st_value -= tls_sec->vma;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT (input_sec->owner == NULL
|
||
|| (input_sec->owner->flags & DYNAMIC) != 0);
|
||
sym.st_shndx = SHN_UNDEF;
|
||
input_sec = bfd_und_section_ptr;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
input_sec = h->root.u.c.p->section;
|
||
sym.st_shndx = bed->common_section_index (input_sec);
|
||
sym.st_value = 1 << h->root.u.c.p->alignment_power;
|
||
break;
|
||
|
||
case bfd_link_hash_indirect:
|
||
/* These symbols are created by symbol versioning. They point
|
||
to the decorated version of the name. For example, if the
|
||
symbol foo@@GNU_1.2 is the default, which should be used when
|
||
foo is used with no version, then we add an indirect symbol
|
||
foo which points to foo@@GNU_1.2. We ignore these symbols,
|
||
since the indirected symbol is already in the hash table. */
|
||
return TRUE;
|
||
}
|
||
|
||
/* Give the processor backend a chance to tweak the symbol value,
|
||
and also to finish up anything that needs to be done for this
|
||
symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
|
||
forced local syms when non-shared is due to a historical quirk.
|
||
STT_GNU_IFUNC symbol must go through PLT. */
|
||
if ((h->type == STT_GNU_IFUNC
|
||
&& h->def_regular
|
||
&& !flinfo->info->relocatable)
|
||
|| ((h->dynindx != -1
|
||
|| h->forced_local)
|
||
&& ((flinfo->info->shared
|
||
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak))
|
||
|| !h->forced_local)
|
||
&& elf_hash_table (flinfo->info)->dynamic_sections_created))
|
||
{
|
||
if (! ((*bed->elf_backend_finish_dynamic_symbol)
|
||
(flinfo->output_bfd, flinfo->info, h, &sym)))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* If we are marking the symbol as undefined, and there are no
|
||
non-weak references to this symbol from a regular object, then
|
||
mark the symbol as weak undefined; if there are non-weak
|
||
references, mark the symbol as strong. We can't do this earlier,
|
||
because it might not be marked as undefined until the
|
||
finish_dynamic_symbol routine gets through with it. */
|
||
if (sym.st_shndx == SHN_UNDEF
|
||
&& h->ref_regular
|
||
&& (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
|
||
|| ELF_ST_BIND (sym.st_info) == STB_WEAK))
|
||
{
|
||
int bindtype;
|
||
unsigned int type = ELF_ST_TYPE (sym.st_info);
|
||
|
||
/* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
|
||
if (type == STT_GNU_IFUNC)
|
||
type = STT_FUNC;
|
||
|
||
if (h->ref_regular_nonweak)
|
||
bindtype = STB_GLOBAL;
|
||
else
|
||
bindtype = STB_WEAK;
|
||
sym.st_info = ELF_ST_INFO (bindtype, type);
|
||
}
|
||
|
||
/* If this is a symbol defined in a dynamic library, don't use the
|
||
symbol size from the dynamic library. Relinking an executable
|
||
against a new library may introduce gratuitous changes in the
|
||
executable's symbols if we keep the size. */
|
||
if (sym.st_shndx == SHN_UNDEF
|
||
&& !h->def_regular
|
||
&& h->def_dynamic)
|
||
sym.st_size = 0;
|
||
|
||
/* If a non-weak symbol with non-default visibility is not defined
|
||
locally, it is a fatal error. */
|
||
if (!flinfo->info->relocatable
|
||
&& ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
|
||
&& ELF_ST_BIND (sym.st_info) != STB_WEAK
|
||
&& h->root.type == bfd_link_hash_undefined
|
||
&& !h->def_regular)
|
||
{
|
||
const char *msg;
|
||
|
||
if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
|
||
msg = _("%B: protected symbol `%s' isn't defined");
|
||
else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
|
||
msg = _("%B: internal symbol `%s' isn't defined");
|
||
else
|
||
msg = _("%B: hidden symbol `%s' isn't defined");
|
||
(*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* If this symbol should be put in the .dynsym section, then put it
|
||
there now. We already know the symbol index. We also fill in
|
||
the entry in the .hash section. */
|
||
if (flinfo->dynsym_sec != NULL
|
||
&& h->dynindx != -1
|
||
&& elf_hash_table (flinfo->info)->dynamic_sections_created)
|
||
{
|
||
bfd_byte *esym;
|
||
|
||
/* Since there is no version information in the dynamic string,
|
||
if there is no version info in symbol version section, we will
|
||
have a run-time problem. */
|
||
if (h->verinfo.verdef == NULL)
|
||
{
|
||
char *p = strrchr (h->root.root.string, ELF_VER_CHR);
|
||
|
||
if (p && p [1] != '\0')
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: No symbol version section for versioned symbol `%s'"),
|
||
flinfo->output_bfd, h->root.root.string);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
sym.st_name = h->dynstr_index;
|
||
esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
|
||
if (!check_dynsym (flinfo->output_bfd, &sym))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
|
||
|
||
if (flinfo->hash_sec != NULL)
|
||
{
|
||
size_t hash_entry_size;
|
||
bfd_byte *bucketpos;
|
||
bfd_vma chain;
|
||
size_t bucketcount;
|
||
size_t bucket;
|
||
|
||
bucketcount = elf_hash_table (flinfo->info)->bucketcount;
|
||
bucket = h->u.elf_hash_value % bucketcount;
|
||
|
||
hash_entry_size
|
||
= elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
|
||
bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
|
||
+ (bucket + 2) * hash_entry_size);
|
||
chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
|
||
bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
|
||
bucketpos);
|
||
bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
|
||
((bfd_byte *) flinfo->hash_sec->contents
|
||
+ (bucketcount + 2 + h->dynindx) * hash_entry_size));
|
||
}
|
||
|
||
if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
|
||
{
|
||
Elf_Internal_Versym iversym;
|
||
Elf_External_Versym *eversym;
|
||
|
||
if (!h->def_regular)
|
||
{
|
||
if (h->verinfo.verdef == NULL
|
||
|| (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
|
||
& (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
|
||
iversym.vs_vers = 0;
|
||
else
|
||
iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
|
||
}
|
||
else
|
||
{
|
||
if (h->verinfo.vertree == NULL)
|
||
iversym.vs_vers = 1;
|
||
else
|
||
iversym.vs_vers = h->verinfo.vertree->vernum + 1;
|
||
if (flinfo->info->create_default_symver)
|
||
iversym.vs_vers++;
|
||
}
|
||
|
||
if (h->hidden)
|
||
iversym.vs_vers |= VERSYM_HIDDEN;
|
||
|
||
eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
|
||
eversym += h->dynindx;
|
||
_bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
|
||
}
|
||
}
|
||
|
||
/* If the symbol is undefined, and we didn't output it to .dynsym,
|
||
strip it from .symtab too. Obviously we can't do this for
|
||
relocatable output or when needed for --emit-relocs. */
|
||
else if (input_sec == bfd_und_section_ptr
|
||
&& h->indx != -2
|
||
&& !flinfo->info->relocatable)
|
||
return TRUE;
|
||
/* Also strip others that we couldn't earlier due to dynamic symbol
|
||
processing. */
|
||
if (strip)
|
||
return TRUE;
|
||
if ((input_sec->flags & SEC_EXCLUDE) != 0)
|
||
return TRUE;
|
||
|
||
/* Output a FILE symbol so that following locals are not associated
|
||
with the wrong input file. We need one for forced local symbols
|
||
if we've seen more than one FILE symbol or when we have exactly
|
||
one FILE symbol but global symbols are present in a file other
|
||
than the one with the FILE symbol. We also need one if linker
|
||
defined symbols are present. In practice these conditions are
|
||
always met, so just emit the FILE symbol unconditionally. */
|
||
if (eoinfo->localsyms
|
||
&& !eoinfo->file_sym_done
|
||
&& eoinfo->flinfo->filesym_count != 0)
|
||
{
|
||
Elf_Internal_Sym fsym;
|
||
|
||
memset (&fsym, 0, sizeof (fsym));
|
||
fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
|
||
fsym.st_shndx = SHN_ABS;
|
||
if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
|
||
bfd_und_section_ptr, NULL))
|
||
return FALSE;
|
||
|
||
eoinfo->file_sym_done = TRUE;
|
||
}
|
||
|
||
indx = bfd_get_symcount (flinfo->output_bfd);
|
||
ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
|
||
input_sec, h);
|
||
if (ret == 0)
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
else if (ret == 1)
|
||
h->indx = indx;
|
||
else if (h->indx == -2)
|
||
abort();
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Return TRUE if special handling is done for relocs in SEC against
|
||
symbols defined in discarded sections. */
|
||
|
||
static bfd_boolean
|
||
elf_section_ignore_discarded_relocs (asection *sec)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
switch (sec->sec_info_type)
|
||
{
|
||
case SEC_INFO_TYPE_STABS:
|
||
case SEC_INFO_TYPE_EH_FRAME:
|
||
case SEC_INFO_TYPE_EH_FRAME_ENTRY:
|
||
return TRUE;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
bed = get_elf_backend_data (sec->owner);
|
||
if (bed->elf_backend_ignore_discarded_relocs != NULL
|
||
&& (*bed->elf_backend_ignore_discarded_relocs) (sec))
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Return a mask saying how ld should treat relocations in SEC against
|
||
symbols defined in discarded sections. If this function returns
|
||
COMPLAIN set, ld will issue a warning message. If this function
|
||
returns PRETEND set, and the discarded section was link-once and the
|
||
same size as the kept link-once section, ld will pretend that the
|
||
symbol was actually defined in the kept section. Otherwise ld will
|
||
zero the reloc (at least that is the intent, but some cooperation by
|
||
the target dependent code is needed, particularly for REL targets). */
|
||
|
||
unsigned int
|
||
_bfd_elf_default_action_discarded (asection *sec)
|
||
{
|
||
if (sec->flags & SEC_DEBUGGING)
|
||
return PRETEND;
|
||
|
||
if (strcmp (".eh_frame", sec->name) == 0)
|
||
return 0;
|
||
|
||
if (strcmp (".gcc_except_table", sec->name) == 0)
|
||
return 0;
|
||
|
||
return COMPLAIN | PRETEND;
|
||
}
|
||
|
||
/* Find a match between a section and a member of a section group. */
|
||
|
||
static asection *
|
||
match_group_member (asection *sec, asection *group,
|
||
struct bfd_link_info *info)
|
||
{
|
||
asection *first = elf_next_in_group (group);
|
||
asection *s = first;
|
||
|
||
while (s != NULL)
|
||
{
|
||
if (bfd_elf_match_symbols_in_sections (s, sec, info))
|
||
return s;
|
||
|
||
s = elf_next_in_group (s);
|
||
if (s == first)
|
||
break;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Check if the kept section of a discarded section SEC can be used
|
||
to replace it. Return the replacement if it is OK. Otherwise return
|
||
NULL. */
|
||
|
||
asection *
|
||
_bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
|
||
{
|
||
asection *kept;
|
||
|
||
kept = sec->kept_section;
|
||
if (kept != NULL)
|
||
{
|
||
if ((kept->flags & SEC_GROUP) != 0)
|
||
kept = match_group_member (sec, kept, info);
|
||
if (kept != NULL
|
||
&& ((sec->rawsize != 0 ? sec->rawsize : sec->size)
|
||
!= (kept->rawsize != 0 ? kept->rawsize : kept->size)))
|
||
kept = NULL;
|
||
sec->kept_section = kept;
|
||
}
|
||
return kept;
|
||
}
|
||
|
||
/* Link an input file into the linker output file. This function
|
||
handles all the sections and relocations of the input file at once.
|
||
This is so that we only have to read the local symbols once, and
|
||
don't have to keep them in memory. */
|
||
|
||
static bfd_boolean
|
||
elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
|
||
{
|
||
int (*relocate_section)
|
||
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
|
||
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
|
||
bfd *output_bfd;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
size_t locsymcount;
|
||
size_t extsymoff;
|
||
Elf_Internal_Sym *isymbuf;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
long *pindex;
|
||
asection **ppsection;
|
||
asection *o;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
bfd_size_type address_size;
|
||
bfd_vma r_type_mask;
|
||
int r_sym_shift;
|
||
bfd_boolean have_file_sym = FALSE;
|
||
|
||
output_bfd = flinfo->output_bfd;
|
||
bed = get_elf_backend_data (output_bfd);
|
||
relocate_section = bed->elf_backend_relocate_section;
|
||
|
||
/* If this is a dynamic object, we don't want to do anything here:
|
||
we don't want the local symbols, and we don't want the section
|
||
contents. */
|
||
if ((input_bfd->flags & DYNAMIC) != 0)
|
||
return TRUE;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
locsymcount = symtab_hdr->sh_info;
|
||
extsymoff = symtab_hdr->sh_info;
|
||
}
|
||
|
||
/* Read the local symbols. */
|
||
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isymbuf == NULL && locsymcount != 0)
|
||
{
|
||
isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
|
||
flinfo->internal_syms,
|
||
flinfo->external_syms,
|
||
flinfo->locsym_shndx);
|
||
if (isymbuf == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Find local symbol sections and adjust values of symbols in
|
||
SEC_MERGE sections. Write out those local symbols we know are
|
||
going into the output file. */
|
||
isymend = isymbuf + locsymcount;
|
||
for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
|
||
isym < isymend;
|
||
isym++, pindex++, ppsection++)
|
||
{
|
||
asection *isec;
|
||
const char *name;
|
||
Elf_Internal_Sym osym;
|
||
long indx;
|
||
int ret;
|
||
|
||
*pindex = -1;
|
||
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
|
||
{
|
||
*ppsection = NULL;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
isec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
isec = bfd_abs_section_ptr;
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
isec = bfd_com_section_ptr;
|
||
else
|
||
{
|
||
isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
|
||
if (isec == NULL)
|
||
{
|
||
/* Don't attempt to output symbols with st_shnx in the
|
||
reserved range other than SHN_ABS and SHN_COMMON. */
|
||
*ppsection = NULL;
|
||
continue;
|
||
}
|
||
else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
|
||
&& ELF_ST_TYPE (isym->st_info) != STT_SECTION)
|
||
isym->st_value =
|
||
_bfd_merged_section_offset (output_bfd, &isec,
|
||
elf_section_data (isec)->sec_info,
|
||
isym->st_value);
|
||
}
|
||
|
||
*ppsection = isec;
|
||
|
||
/* Don't output the first, undefined, symbol. In fact, don't
|
||
output any undefined local symbol. */
|
||
if (isec == bfd_und_section_ptr)
|
||
continue;
|
||
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
|
||
{
|
||
/* We never output section symbols. Instead, we use the
|
||
section symbol of the corresponding section in the output
|
||
file. */
|
||
continue;
|
||
}
|
||
|
||
/* If we are stripping all symbols, we don't want to output this
|
||
one. */
|
||
if (flinfo->info->strip == strip_all)
|
||
continue;
|
||
|
||
/* If we are discarding all local symbols, we don't want to
|
||
output this one. If we are generating a relocatable output
|
||
file, then some of the local symbols may be required by
|
||
relocs; we output them below as we discover that they are
|
||
needed. */
|
||
if (flinfo->info->discard == discard_all)
|
||
continue;
|
||
|
||
/* If this symbol is defined in a section which we are
|
||
discarding, we don't need to keep it. */
|
||
if (isym->st_shndx != SHN_UNDEF
|
||
&& isym->st_shndx < SHN_LORESERVE
|
||
&& bfd_section_removed_from_list (output_bfd,
|
||
isec->output_section))
|
||
continue;
|
||
|
||
/* Get the name of the symbol. */
|
||
name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
return FALSE;
|
||
|
||
/* See if we are discarding symbols with this name. */
|
||
if ((flinfo->info->strip == strip_some
|
||
&& (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
|
||
== NULL))
|
||
|| (((flinfo->info->discard == discard_sec_merge
|
||
&& (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
|
||
|| flinfo->info->discard == discard_l)
|
||
&& bfd_is_local_label_name (input_bfd, name)))
|
||
continue;
|
||
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
|
||
{
|
||
if (input_bfd->lto_output)
|
||
/* -flto puts a temp file name here. This means builds
|
||
are not reproducible. Discard the symbol. */
|
||
continue;
|
||
have_file_sym = TRUE;
|
||
flinfo->filesym_count += 1;
|
||
}
|
||
if (!have_file_sym)
|
||
{
|
||
/* In the absence of debug info, bfd_find_nearest_line uses
|
||
FILE symbols to determine the source file for local
|
||
function symbols. Provide a FILE symbol here if input
|
||
files lack such, so that their symbols won't be
|
||
associated with a previous input file. It's not the
|
||
source file, but the best we can do. */
|
||
have_file_sym = TRUE;
|
||
flinfo->filesym_count += 1;
|
||
memset (&osym, 0, sizeof (osym));
|
||
osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
|
||
osym.st_shndx = SHN_ABS;
|
||
if (!elf_link_output_symstrtab (flinfo,
|
||
(input_bfd->lto_output ? NULL
|
||
: input_bfd->filename),
|
||
&osym, bfd_abs_section_ptr,
|
||
NULL))
|
||
return FALSE;
|
||
}
|
||
|
||
osym = *isym;
|
||
|
||
/* Adjust the section index for the output file. */
|
||
osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
|
||
isec->output_section);
|
||
if (osym.st_shndx == SHN_BAD)
|
||
return FALSE;
|
||
|
||
/* ELF symbols in relocatable files are section relative, but
|
||
in executable files they are virtual addresses. Note that
|
||
this code assumes that all ELF sections have an associated
|
||
BFD section with a reasonable value for output_offset; below
|
||
we assume that they also have a reasonable value for
|
||
output_section. Any special sections must be set up to meet
|
||
these requirements. */
|
||
osym.st_value += isec->output_offset;
|
||
if (!flinfo->info->relocatable)
|
||
{
|
||
osym.st_value += isec->output_section->vma;
|
||
if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
|
||
{
|
||
/* STT_TLS symbols are relative to PT_TLS segment base. */
|
||
BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
|
||
osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
|
||
}
|
||
}
|
||
|
||
indx = bfd_get_symcount (output_bfd);
|
||
ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
|
||
if (ret == 0)
|
||
return FALSE;
|
||
else if (ret == 1)
|
||
*pindex = indx;
|
||
}
|
||
|
||
if (bed->s->arch_size == 32)
|
||
{
|
||
r_type_mask = 0xff;
|
||
r_sym_shift = 8;
|
||
address_size = 4;
|
||
}
|
||
else
|
||
{
|
||
r_type_mask = 0xffffffff;
|
||
r_sym_shift = 32;
|
||
address_size = 8;
|
||
}
|
||
|
||
/* Relocate the contents of each section. */
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
for (o = input_bfd->sections; o != NULL; o = o->next)
|
||
{
|
||
bfd_byte *contents;
|
||
|
||
if (! o->linker_mark)
|
||
{
|
||
/* This section was omitted from the link. */
|
||
continue;
|
||
}
|
||
|
||
if (flinfo->info->relocatable
|
||
&& (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
|
||
{
|
||
/* Deal with the group signature symbol. */
|
||
struct bfd_elf_section_data *sec_data = elf_section_data (o);
|
||
unsigned long symndx = sec_data->this_hdr.sh_info;
|
||
asection *osec = o->output_section;
|
||
|
||
if (symndx >= locsymcount
|
||
|| (elf_bad_symtab (input_bfd)
|
||
&& flinfo->sections[symndx] == NULL))
|
||
{
|
||
struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
/* Arrange for symbol to be output. */
|
||
h->indx = -2;
|
||
elf_section_data (osec)->this_hdr.sh_info = -2;
|
||
}
|
||
else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
|
||
{
|
||
/* We'll use the output section target_index. */
|
||
asection *sec = flinfo->sections[symndx]->output_section;
|
||
elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
|
||
}
|
||
else
|
||
{
|
||
if (flinfo->indices[symndx] == -1)
|
||
{
|
||
/* Otherwise output the local symbol now. */
|
||
Elf_Internal_Sym sym = isymbuf[symndx];
|
||
asection *sec = flinfo->sections[symndx]->output_section;
|
||
const char *name;
|
||
long indx;
|
||
int ret;
|
||
|
||
name = bfd_elf_string_from_elf_section (input_bfd,
|
||
symtab_hdr->sh_link,
|
||
sym.st_name);
|
||
if (name == NULL)
|
||
return FALSE;
|
||
|
||
sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
|
||
sec);
|
||
if (sym.st_shndx == SHN_BAD)
|
||
return FALSE;
|
||
|
||
sym.st_value += o->output_offset;
|
||
|
||
indx = bfd_get_symcount (output_bfd);
|
||
ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
|
||
NULL);
|
||
if (ret == 0)
|
||
return FALSE;
|
||
else if (ret == 1)
|
||
flinfo->indices[symndx] = indx;
|
||
else
|
||
abort ();
|
||
}
|
||
elf_section_data (osec)->this_hdr.sh_info
|
||
= flinfo->indices[symndx];
|
||
}
|
||
}
|
||
|
||
if ((o->flags & SEC_HAS_CONTENTS) == 0
|
||
|| (o->size == 0 && (o->flags & SEC_RELOC) == 0))
|
||
continue;
|
||
|
||
if ((o->flags & SEC_LINKER_CREATED) != 0)
|
||
{
|
||
/* Section was created by _bfd_elf_link_create_dynamic_sections
|
||
or somesuch. */
|
||
continue;
|
||
}
|
||
|
||
/* Get the contents of the section. They have been cached by a
|
||
relaxation routine. Note that o is a section in an input
|
||
file, so the contents field will not have been set by any of
|
||
the routines which work on output files. */
|
||
if (elf_section_data (o)->this_hdr.contents != NULL)
|
||
{
|
||
contents = elf_section_data (o)->this_hdr.contents;
|
||
if (bed->caches_rawsize
|
||
&& o->rawsize != 0
|
||
&& o->rawsize < o->size)
|
||
{
|
||
memcpy (flinfo->contents, contents, o->rawsize);
|
||
contents = flinfo->contents;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
contents = flinfo->contents;
|
||
if (! bfd_get_full_section_contents (input_bfd, o, &contents))
|
||
return FALSE;
|
||
}
|
||
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
Elf_Internal_Rela *rel, *relend;
|
||
int action_discarded;
|
||
int ret;
|
||
|
||
/* Get the swapped relocs. */
|
||
internal_relocs
|
||
= _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
|
||
flinfo->internal_relocs, FALSE);
|
||
if (internal_relocs == NULL
|
||
&& o->reloc_count > 0)
|
||
return FALSE;
|
||
|
||
/* We need to reverse-copy input .ctors/.dtors sections if
|
||
they are placed in .init_array/.finit_array for output. */
|
||
if (o->size > address_size
|
||
&& ((strncmp (o->name, ".ctors", 6) == 0
|
||
&& strcmp (o->output_section->name,
|
||
".init_array") == 0)
|
||
|| (strncmp (o->name, ".dtors", 6) == 0
|
||
&& strcmp (o->output_section->name,
|
||
".fini_array") == 0))
|
||
&& (o->name[6] == 0 || o->name[6] == '.'))
|
||
{
|
||
if (o->size != o->reloc_count * address_size)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("error: %B: size of section %A is not "
|
||
"multiple of address size"),
|
||
input_bfd, o);
|
||
bfd_set_error (bfd_error_on_input);
|
||
return FALSE;
|
||
}
|
||
o->flags |= SEC_ELF_REVERSE_COPY;
|
||
}
|
||
|
||
action_discarded = -1;
|
||
if (!elf_section_ignore_discarded_relocs (o))
|
||
action_discarded = (*bed->action_discarded) (o);
|
||
|
||
/* Run through the relocs evaluating complex reloc symbols and
|
||
looking for relocs against symbols from discarded sections
|
||
or section symbols from removed link-once sections.
|
||
Complain about relocs against discarded sections. Zero
|
||
relocs against removed link-once sections. */
|
||
|
||
rel = internal_relocs;
|
||
relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
for ( ; rel < relend; rel++)
|
||
{
|
||
unsigned long r_symndx = rel->r_info >> r_sym_shift;
|
||
unsigned int s_type;
|
||
asection **ps, *sec;
|
||
struct elf_link_hash_entry *h = NULL;
|
||
const char *sym_name;
|
||
|
||
if (r_symndx == STN_UNDEF)
|
||
continue;
|
||
|
||
if (r_symndx >= locsymcount
|
||
|| (elf_bad_symtab (input_bfd)
|
||
&& flinfo->sections[r_symndx] == NULL))
|
||
{
|
||
h = sym_hashes[r_symndx - extsymoff];
|
||
|
||
/* Badly formatted input files can contain relocs that
|
||
reference non-existant symbols. Check here so that
|
||
we do not seg fault. */
|
||
if (h == NULL)
|
||
{
|
||
char buffer [32];
|
||
|
||
sprintf_vma (buffer, rel->r_info);
|
||
(*_bfd_error_handler)
|
||
(_("error: %B contains a reloc (0x%s) for section %A "
|
||
"that references a non-existent global symbol"),
|
||
input_bfd, o, buffer);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
s_type = h->type;
|
||
|
||
/* If a plugin symbol is referenced from a non-IR file,
|
||
mark the symbol as undefined. Note that the
|
||
linker may attach linker created dynamic sections
|
||
to the plugin bfd. Symbols defined in linker
|
||
created sections are not plugin symbols. */
|
||
if (h->root.non_ir_ref
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& (h->root.u.def.section->flags
|
||
& SEC_LINKER_CREATED) == 0
|
||
&& h->root.u.def.section->owner != NULL
|
||
&& (h->root.u.def.section->owner->flags
|
||
& BFD_PLUGIN) != 0)
|
||
{
|
||
h->root.type = bfd_link_hash_undefined;
|
||
h->root.u.undef.abfd = h->root.u.def.section->owner;
|
||
}
|
||
|
||
ps = NULL;
|
||
if (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
ps = &h->root.u.def.section;
|
||
|
||
sym_name = h->root.root.string;
|
||
}
|
||
else
|
||
{
|
||
Elf_Internal_Sym *sym = isymbuf + r_symndx;
|
||
|
||
s_type = ELF_ST_TYPE (sym->st_info);
|
||
ps = &flinfo->sections[r_symndx];
|
||
sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
|
||
sym, *ps);
|
||
}
|
||
|
||
if ((s_type == STT_RELC || s_type == STT_SRELC)
|
||
&& !flinfo->info->relocatable)
|
||
{
|
||
bfd_vma val;
|
||
bfd_vma dot = (rel->r_offset
|
||
+ o->output_offset + o->output_section->vma);
|
||
#ifdef DEBUG
|
||
printf ("Encountered a complex symbol!");
|
||
printf (" (input_bfd %s, section %s, reloc %ld\n",
|
||
input_bfd->filename, o->name,
|
||
(long) (rel - internal_relocs));
|
||
printf (" symbol: idx %8.8lx, name %s\n",
|
||
r_symndx, sym_name);
|
||
printf (" reloc : info %8.8lx, addr %8.8lx\n",
|
||
(unsigned long) rel->r_info,
|
||
(unsigned long) rel->r_offset);
|
||
#endif
|
||
if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
|
||
isymbuf, locsymcount, s_type == STT_SRELC))
|
||
return FALSE;
|
||
|
||
/* Symbol evaluated OK. Update to absolute value. */
|
||
set_symbol_value (input_bfd, isymbuf, locsymcount,
|
||
r_symndx, val);
|
||
continue;
|
||
}
|
||
|
||
if (action_discarded != -1 && ps != NULL)
|
||
{
|
||
/* Complain if the definition comes from a
|
||
discarded section. */
|
||
if ((sec = *ps) != NULL && discarded_section (sec))
|
||
{
|
||
BFD_ASSERT (r_symndx != STN_UNDEF);
|
||
if (action_discarded & COMPLAIN)
|
||
(*flinfo->info->callbacks->einfo)
|
||
(_("%X`%s' referenced in section `%A' of %B: "
|
||
"defined in discarded section `%A' of %B\n"),
|
||
sym_name, o, input_bfd, sec, sec->owner);
|
||
|
||
/* Try to do the best we can to support buggy old
|
||
versions of gcc. Pretend that the symbol is
|
||
really defined in the kept linkonce section.
|
||
FIXME: This is quite broken. Modifying the
|
||
symbol here means we will be changing all later
|
||
uses of the symbol, not just in this section. */
|
||
if (action_discarded & PRETEND)
|
||
{
|
||
asection *kept;
|
||
|
||
kept = _bfd_elf_check_kept_section (sec,
|
||
flinfo->info);
|
||
if (kept != NULL)
|
||
{
|
||
*ps = kept;
|
||
continue;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Relocate the section by invoking a back end routine.
|
||
|
||
The back end routine is responsible for adjusting the
|
||
section contents as necessary, and (if using Rela relocs
|
||
and generating a relocatable output file) adjusting the
|
||
reloc addend as necessary.
|
||
|
||
The back end routine does not have to worry about setting
|
||
the reloc address or the reloc symbol index.
|
||
|
||
The back end routine is given a pointer to the swapped in
|
||
internal symbols, and can access the hash table entries
|
||
for the external symbols via elf_sym_hashes (input_bfd).
|
||
|
||
When generating relocatable output, the back end routine
|
||
must handle STB_LOCAL/STT_SECTION symbols specially. The
|
||
output symbol is going to be a section symbol
|
||
corresponding to the output section, which will require
|
||
the addend to be adjusted. */
|
||
|
||
ret = (*relocate_section) (output_bfd, flinfo->info,
|
||
input_bfd, o, contents,
|
||
internal_relocs,
|
||
isymbuf,
|
||
flinfo->sections);
|
||
if (!ret)
|
||
return FALSE;
|
||
|
||
if (ret == 2
|
||
|| flinfo->info->relocatable
|
||
|| flinfo->info->emitrelocations)
|
||
{
|
||
Elf_Internal_Rela *irela;
|
||
Elf_Internal_Rela *irelaend, *irelamid;
|
||
bfd_vma last_offset;
|
||
struct elf_link_hash_entry **rel_hash;
|
||
struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
|
||
Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
|
||
unsigned int next_erel;
|
||
bfd_boolean rela_normal;
|
||
struct bfd_elf_section_data *esdi, *esdo;
|
||
|
||
esdi = elf_section_data (o);
|
||
esdo = elf_section_data (o->output_section);
|
||
rela_normal = FALSE;
|
||
|
||
/* Adjust the reloc addresses and symbol indices. */
|
||
|
||
irela = internal_relocs;
|
||
irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
rel_hash = esdo->rel.hashes + esdo->rel.count;
|
||
/* We start processing the REL relocs, if any. When we reach
|
||
IRELAMID in the loop, we switch to the RELA relocs. */
|
||
irelamid = irela;
|
||
if (esdi->rel.hdr != NULL)
|
||
irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
|
||
* bed->s->int_rels_per_ext_rel);
|
||
rel_hash_list = rel_hash;
|
||
rela_hash_list = NULL;
|
||
last_offset = o->output_offset;
|
||
if (!flinfo->info->relocatable)
|
||
last_offset += o->output_section->vma;
|
||
for (next_erel = 0; irela < irelaend; irela++, next_erel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
asection *sec;
|
||
Elf_Internal_Sym sym;
|
||
|
||
if (next_erel == bed->s->int_rels_per_ext_rel)
|
||
{
|
||
rel_hash++;
|
||
next_erel = 0;
|
||
}
|
||
|
||
if (irela == irelamid)
|
||
{
|
||
rel_hash = esdo->rela.hashes + esdo->rela.count;
|
||
rela_hash_list = rel_hash;
|
||
rela_normal = bed->rela_normal;
|
||
}
|
||
|
||
irela->r_offset = _bfd_elf_section_offset (output_bfd,
|
||
flinfo->info, o,
|
||
irela->r_offset);
|
||
if (irela->r_offset >= (bfd_vma) -2)
|
||
{
|
||
/* This is a reloc for a deleted entry or somesuch.
|
||
Turn it into an R_*_NONE reloc, at the same
|
||
offset as the last reloc. elf_eh_frame.c and
|
||
bfd_elf_discard_info rely on reloc offsets
|
||
being ordered. */
|
||
irela->r_offset = last_offset;
|
||
irela->r_info = 0;
|
||
irela->r_addend = 0;
|
||
continue;
|
||
}
|
||
|
||
irela->r_offset += o->output_offset;
|
||
|
||
/* Relocs in an executable have to be virtual addresses. */
|
||
if (!flinfo->info->relocatable)
|
||
irela->r_offset += o->output_section->vma;
|
||
|
||
last_offset = irela->r_offset;
|
||
|
||
r_symndx = irela->r_info >> r_sym_shift;
|
||
if (r_symndx == STN_UNDEF)
|
||
continue;
|
||
|
||
if (r_symndx >= locsymcount
|
||
|| (elf_bad_symtab (input_bfd)
|
||
&& flinfo->sections[r_symndx] == NULL))
|
||
{
|
||
struct elf_link_hash_entry *rh;
|
||
unsigned long indx;
|
||
|
||
/* This is a reloc against a global symbol. We
|
||
have not yet output all the local symbols, so
|
||
we do not know the symbol index of any global
|
||
symbol. We set the rel_hash entry for this
|
||
reloc to point to the global hash table entry
|
||
for this symbol. The symbol index is then
|
||
set at the end of bfd_elf_final_link. */
|
||
indx = r_symndx - extsymoff;
|
||
rh = elf_sym_hashes (input_bfd)[indx];
|
||
while (rh->root.type == bfd_link_hash_indirect
|
||
|| rh->root.type == bfd_link_hash_warning)
|
||
rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
|
||
|
||
/* Setting the index to -2 tells
|
||
elf_link_output_extsym that this symbol is
|
||
used by a reloc. */
|
||
BFD_ASSERT (rh->indx < 0);
|
||
rh->indx = -2;
|
||
|
||
*rel_hash = rh;
|
||
|
||
continue;
|
||
}
|
||
|
||
/* This is a reloc against a local symbol. */
|
||
|
||
*rel_hash = NULL;
|
||
sym = isymbuf[r_symndx];
|
||
sec = flinfo->sections[r_symndx];
|
||
if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
|
||
{
|
||
/* I suppose the backend ought to fill in the
|
||
section of any STT_SECTION symbol against a
|
||
processor specific section. */
|
||
r_symndx = STN_UNDEF;
|
||
if (bfd_is_abs_section (sec))
|
||
;
|
||
else if (sec == NULL || sec->owner == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
asection *osec = sec->output_section;
|
||
|
||
/* If we have discarded a section, the output
|
||
section will be the absolute section. In
|
||
case of discarded SEC_MERGE sections, use
|
||
the kept section. relocate_section should
|
||
have already handled discarded linkonce
|
||
sections. */
|
||
if (bfd_is_abs_section (osec)
|
||
&& sec->kept_section != NULL
|
||
&& sec->kept_section->output_section != NULL)
|
||
{
|
||
osec = sec->kept_section->output_section;
|
||
irela->r_addend -= osec->vma;
|
||
}
|
||
|
||
if (!bfd_is_abs_section (osec))
|
||
{
|
||
r_symndx = osec->target_index;
|
||
if (r_symndx == STN_UNDEF)
|
||
{
|
||
irela->r_addend += osec->vma;
|
||
osec = _bfd_nearby_section (output_bfd, osec,
|
||
osec->vma);
|
||
irela->r_addend -= osec->vma;
|
||
r_symndx = osec->target_index;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Adjust the addend according to where the
|
||
section winds up in the output section. */
|
||
if (rela_normal)
|
||
irela->r_addend += sec->output_offset;
|
||
}
|
||
else
|
||
{
|
||
if (flinfo->indices[r_symndx] == -1)
|
||
{
|
||
unsigned long shlink;
|
||
const char *name;
|
||
asection *osec;
|
||
long indx;
|
||
|
||
if (flinfo->info->strip == strip_all)
|
||
{
|
||
/* You can't do ld -r -s. */
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
}
|
||
|
||
/* This symbol was skipped earlier, but
|
||
since it is needed by a reloc, we
|
||
must output it now. */
|
||
shlink = symtab_hdr->sh_link;
|
||
name = (bfd_elf_string_from_elf_section
|
||
(input_bfd, shlink, sym.st_name));
|
||
if (name == NULL)
|
||
return FALSE;
|
||
|
||
osec = sec->output_section;
|
||
sym.st_shndx =
|
||
_bfd_elf_section_from_bfd_section (output_bfd,
|
||
osec);
|
||
if (sym.st_shndx == SHN_BAD)
|
||
return FALSE;
|
||
|
||
sym.st_value += sec->output_offset;
|
||
if (!flinfo->info->relocatable)
|
||
{
|
||
sym.st_value += osec->vma;
|
||
if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
|
||
{
|
||
/* STT_TLS symbols are relative to PT_TLS
|
||
segment base. */
|
||
BFD_ASSERT (elf_hash_table (flinfo->info)
|
||
->tls_sec != NULL);
|
||
sym.st_value -= (elf_hash_table (flinfo->info)
|
||
->tls_sec->vma);
|
||
}
|
||
}
|
||
|
||
indx = bfd_get_symcount (output_bfd);
|
||
ret = elf_link_output_symstrtab (flinfo, name,
|
||
&sym, sec,
|
||
NULL);
|
||
if (ret == 0)
|
||
return FALSE;
|
||
else if (ret == 1)
|
||
flinfo->indices[r_symndx] = indx;
|
||
else
|
||
abort ();
|
||
}
|
||
|
||
r_symndx = flinfo->indices[r_symndx];
|
||
}
|
||
|
||
irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
|
||
| (irela->r_info & r_type_mask));
|
||
}
|
||
|
||
/* Swap out the relocs. */
|
||
input_rel_hdr = esdi->rel.hdr;
|
||
if (input_rel_hdr && input_rel_hdr->sh_size != 0)
|
||
{
|
||
if (!bed->elf_backend_emit_relocs (output_bfd, o,
|
||
input_rel_hdr,
|
||
internal_relocs,
|
||
rel_hash_list))
|
||
return FALSE;
|
||
internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
|
||
* bed->s->int_rels_per_ext_rel);
|
||
rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
|
||
}
|
||
|
||
input_rela_hdr = esdi->rela.hdr;
|
||
if (input_rela_hdr && input_rela_hdr->sh_size != 0)
|
||
{
|
||
if (!bed->elf_backend_emit_relocs (output_bfd, o,
|
||
input_rela_hdr,
|
||
internal_relocs,
|
||
rela_hash_list))
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Write out the modified section contents. */
|
||
if (bed->elf_backend_write_section
|
||
&& (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
|
||
contents))
|
||
{
|
||
/* Section written out. */
|
||
}
|
||
else switch (o->sec_info_type)
|
||
{
|
||
case SEC_INFO_TYPE_STABS:
|
||
if (! (_bfd_write_section_stabs
|
||
(output_bfd,
|
||
&elf_hash_table (flinfo->info)->stab_info,
|
||
o, &elf_section_data (o)->sec_info, contents)))
|
||
return FALSE;
|
||
break;
|
||
case SEC_INFO_TYPE_MERGE:
|
||
if (! _bfd_write_merged_section (output_bfd, o,
|
||
elf_section_data (o)->sec_info))
|
||
return FALSE;
|
||
break;
|
||
case SEC_INFO_TYPE_EH_FRAME:
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
|
||
o, contents))
|
||
return FALSE;
|
||
}
|
||
break;
|
||
case SEC_INFO_TYPE_EH_FRAME_ENTRY:
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
|
||
flinfo->info,
|
||
o, contents))
|
||
return FALSE;
|
||
}
|
||
break;
|
||
default:
|
||
{
|
||
/* FIXME: octets_per_byte. */
|
||
if (! (o->flags & SEC_EXCLUDE))
|
||
{
|
||
file_ptr offset = (file_ptr) o->output_offset;
|
||
bfd_size_type todo = o->size;
|
||
if ((o->flags & SEC_ELF_REVERSE_COPY))
|
||
{
|
||
/* Reverse-copy input section to output. */
|
||
do
|
||
{
|
||
todo -= address_size;
|
||
if (! bfd_set_section_contents (output_bfd,
|
||
o->output_section,
|
||
contents + todo,
|
||
offset,
|
||
address_size))
|
||
return FALSE;
|
||
if (todo == 0)
|
||
break;
|
||
offset += address_size;
|
||
}
|
||
while (1);
|
||
}
|
||
else if (! bfd_set_section_contents (output_bfd,
|
||
o->output_section,
|
||
contents,
|
||
offset, todo))
|
||
return FALSE;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Generate a reloc when linking an ELF file. This is a reloc
|
||
requested by the linker, and does not come from any input file. This
|
||
is used to build constructor and destructor tables when linking
|
||
with -Ur. */
|
||
|
||
static bfd_boolean
|
||
elf_reloc_link_order (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
asection *output_section,
|
||
struct bfd_link_order *link_order)
|
||
{
|
||
reloc_howto_type *howto;
|
||
long indx;
|
||
bfd_vma offset;
|
||
bfd_vma addend;
|
||
struct bfd_elf_section_reloc_data *reldata;
|
||
struct elf_link_hash_entry **rel_hash_ptr;
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
|
||
Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
|
||
bfd_byte *erel;
|
||
unsigned int i;
|
||
struct bfd_elf_section_data *esdo = elf_section_data (output_section);
|
||
|
||
howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
|
||
if (howto == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
addend = link_order->u.reloc.p->addend;
|
||
|
||
if (esdo->rel.hdr)
|
||
reldata = &esdo->rel;
|
||
else if (esdo->rela.hdr)
|
||
reldata = &esdo->rela;
|
||
else
|
||
{
|
||
reldata = NULL;
|
||
BFD_ASSERT (0);
|
||
}
|
||
|
||
/* Figure out the symbol index. */
|
||
rel_hash_ptr = reldata->hashes + reldata->count;
|
||
if (link_order->type == bfd_section_reloc_link_order)
|
||
{
|
||
indx = link_order->u.reloc.p->u.section->target_index;
|
||
BFD_ASSERT (indx != 0);
|
||
*rel_hash_ptr = NULL;
|
||
}
|
||
else
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
/* Treat a reloc against a defined symbol as though it were
|
||
actually against the section. */
|
||
h = ((struct elf_link_hash_entry *)
|
||
bfd_wrapped_link_hash_lookup (output_bfd, info,
|
||
link_order->u.reloc.p->u.name,
|
||
FALSE, FALSE, TRUE));
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
asection *section;
|
||
|
||
section = h->root.u.def.section;
|
||
indx = section->output_section->target_index;
|
||
*rel_hash_ptr = NULL;
|
||
/* It seems that we ought to add the symbol value to the
|
||
addend here, but in practice it has already been added
|
||
because it was passed to constructor_callback. */
|
||
addend += section->output_section->vma + section->output_offset;
|
||
}
|
||
else if (h != NULL)
|
||
{
|
||
/* Setting the index to -2 tells elf_link_output_extsym that
|
||
this symbol is used by a reloc. */
|
||
h->indx = -2;
|
||
*rel_hash_ptr = h;
|
||
indx = 0;
|
||
}
|
||
else
|
||
{
|
||
if (! ((*info->callbacks->unattached_reloc)
|
||
(info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
|
||
return FALSE;
|
||
indx = 0;
|
||
}
|
||
}
|
||
|
||
/* If this is an inplace reloc, we must write the addend into the
|
||
object file. */
|
||
if (howto->partial_inplace && addend != 0)
|
||
{
|
||
bfd_size_type size;
|
||
bfd_reloc_status_type rstat;
|
||
bfd_byte *buf;
|
||
bfd_boolean ok;
|
||
const char *sym_name;
|
||
|
||
size = (bfd_size_type) bfd_get_reloc_size (howto);
|
||
buf = (bfd_byte *) bfd_zmalloc (size);
|
||
if (buf == NULL && size != 0)
|
||
return FALSE;
|
||
rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
|
||
switch (rstat)
|
||
{
|
||
case bfd_reloc_ok:
|
||
break;
|
||
|
||
default:
|
||
case bfd_reloc_outofrange:
|
||
abort ();
|
||
|
||
case bfd_reloc_overflow:
|
||
if (link_order->type == bfd_section_reloc_link_order)
|
||
sym_name = bfd_section_name (output_bfd,
|
||
link_order->u.reloc.p->u.section);
|
||
else
|
||
sym_name = link_order->u.reloc.p->u.name;
|
||
if (! ((*info->callbacks->reloc_overflow)
|
||
(info, NULL, sym_name, howto->name, addend, NULL,
|
||
NULL, (bfd_vma) 0)))
|
||
{
|
||
free (buf);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
}
|
||
ok = bfd_set_section_contents (output_bfd, output_section, buf,
|
||
link_order->offset, size);
|
||
free (buf);
|
||
if (! ok)
|
||
return FALSE;
|
||
}
|
||
|
||
/* The address of a reloc is relative to the section in a
|
||
relocatable file, and is a virtual address in an executable
|
||
file. */
|
||
offset = link_order->offset;
|
||
if (! info->relocatable)
|
||
offset += output_section->vma;
|
||
|
||
for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
|
||
{
|
||
irel[i].r_offset = offset;
|
||
irel[i].r_info = 0;
|
||
irel[i].r_addend = 0;
|
||
}
|
||
if (bed->s->arch_size == 32)
|
||
irel[0].r_info = ELF32_R_INFO (indx, howto->type);
|
||
else
|
||
irel[0].r_info = ELF64_R_INFO (indx, howto->type);
|
||
|
||
rel_hdr = reldata->hdr;
|
||
erel = rel_hdr->contents;
|
||
if (rel_hdr->sh_type == SHT_REL)
|
||
{
|
||
erel += reldata->count * bed->s->sizeof_rel;
|
||
(*bed->s->swap_reloc_out) (output_bfd, irel, erel);
|
||
}
|
||
else
|
||
{
|
||
irel[0].r_addend = addend;
|
||
erel += reldata->count * bed->s->sizeof_rela;
|
||
(*bed->s->swap_reloca_out) (output_bfd, irel, erel);
|
||
}
|
||
|
||
++reldata->count;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/* Get the output vma of the section pointed to by the sh_link field. */
|
||
|
||
static bfd_vma
|
||
elf_get_linked_section_vma (struct bfd_link_order *p)
|
||
{
|
||
Elf_Internal_Shdr **elf_shdrp;
|
||
asection *s;
|
||
int elfsec;
|
||
|
||
s = p->u.indirect.section;
|
||
elf_shdrp = elf_elfsections (s->owner);
|
||
elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
|
||
elfsec = elf_shdrp[elfsec]->sh_link;
|
||
/* PR 290:
|
||
The Intel C compiler generates SHT_IA_64_UNWIND with
|
||
SHF_LINK_ORDER. But it doesn't set the sh_link or
|
||
sh_info fields. Hence we could get the situation
|
||
where elfsec is 0. */
|
||
if (elfsec == 0)
|
||
{
|
||
const struct elf_backend_data *bed
|
||
= get_elf_backend_data (s->owner);
|
||
if (bed->link_order_error_handler)
|
||
bed->link_order_error_handler
|
||
(_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
s = elf_shdrp[elfsec]->bfd_section;
|
||
return s->output_section->vma + s->output_offset;
|
||
}
|
||
}
|
||
|
||
|
||
/* Compare two sections based on the locations of the sections they are
|
||
linked to. Used by elf_fixup_link_order. */
|
||
|
||
static int
|
||
compare_link_order (const void * a, const void * b)
|
||
{
|
||
bfd_vma apos;
|
||
bfd_vma bpos;
|
||
|
||
apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
|
||
bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
|
||
if (apos < bpos)
|
||
return -1;
|
||
return apos > bpos;
|
||
}
|
||
|
||
|
||
/* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
|
||
order as their linked sections. Returns false if this could not be done
|
||
because an output section includes both ordered and unordered
|
||
sections. Ideally we'd do this in the linker proper. */
|
||
|
||
static bfd_boolean
|
||
elf_fixup_link_order (bfd *abfd, asection *o)
|
||
{
|
||
int seen_linkorder;
|
||
int seen_other;
|
||
int n;
|
||
struct bfd_link_order *p;
|
||
bfd *sub;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
unsigned elfsec;
|
||
struct bfd_link_order **sections;
|
||
asection *s, *other_sec, *linkorder_sec;
|
||
bfd_vma offset;
|
||
|
||
other_sec = NULL;
|
||
linkorder_sec = NULL;
|
||
seen_other = 0;
|
||
seen_linkorder = 0;
|
||
for (p = o->map_head.link_order; p != NULL; p = p->next)
|
||
{
|
||
if (p->type == bfd_indirect_link_order)
|
||
{
|
||
s = p->u.indirect.section;
|
||
sub = s->owner;
|
||
if (bfd_get_flavour (sub) == bfd_target_elf_flavour
|
||
&& elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
|
||
&& (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
|
||
&& elfsec < elf_numsections (sub)
|
||
&& elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
|
||
&& elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
|
||
{
|
||
seen_linkorder++;
|
||
linkorder_sec = s;
|
||
}
|
||
else
|
||
{
|
||
seen_other++;
|
||
other_sec = s;
|
||
}
|
||
}
|
||
else
|
||
seen_other++;
|
||
|
||
if (seen_other && seen_linkorder)
|
||
{
|
||
if (other_sec && linkorder_sec)
|
||
(*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
|
||
o, linkorder_sec,
|
||
linkorder_sec->owner, other_sec,
|
||
other_sec->owner);
|
||
else
|
||
(*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
|
||
o);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
if (!seen_linkorder)
|
||
return TRUE;
|
||
|
||
sections = (struct bfd_link_order **)
|
||
bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
|
||
if (sections == NULL)
|
||
return FALSE;
|
||
seen_linkorder = 0;
|
||
|
||
for (p = o->map_head.link_order; p != NULL; p = p->next)
|
||
{
|
||
sections[seen_linkorder++] = p;
|
||
}
|
||
/* Sort the input sections in the order of their linked section. */
|
||
qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
|
||
compare_link_order);
|
||
|
||
/* Change the offsets of the sections. */
|
||
offset = 0;
|
||
for (n = 0; n < seen_linkorder; n++)
|
||
{
|
||
s = sections[n]->u.indirect.section;
|
||
offset &= ~(bfd_vma) 0 << s->alignment_power;
|
||
s->output_offset = offset;
|
||
sections[n]->offset = offset;
|
||
/* FIXME: octets_per_byte. */
|
||
offset += sections[n]->size;
|
||
}
|
||
|
||
free (sections);
|
||
return TRUE;
|
||
}
|
||
|
||
static void
|
||
elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
|
||
{
|
||
asection *o;
|
||
|
||
if (flinfo->symstrtab != NULL)
|
||
_bfd_elf_strtab_free (flinfo->symstrtab);
|
||
if (flinfo->contents != NULL)
|
||
free (flinfo->contents);
|
||
if (flinfo->external_relocs != NULL)
|
||
free (flinfo->external_relocs);
|
||
if (flinfo->internal_relocs != NULL)
|
||
free (flinfo->internal_relocs);
|
||
if (flinfo->external_syms != NULL)
|
||
free (flinfo->external_syms);
|
||
if (flinfo->locsym_shndx != NULL)
|
||
free (flinfo->locsym_shndx);
|
||
if (flinfo->internal_syms != NULL)
|
||
free (flinfo->internal_syms);
|
||
if (flinfo->indices != NULL)
|
||
free (flinfo->indices);
|
||
if (flinfo->sections != NULL)
|
||
free (flinfo->sections);
|
||
if (flinfo->symshndxbuf != NULL)
|
||
free (flinfo->symshndxbuf);
|
||
for (o = obfd->sections; o != NULL; o = o->next)
|
||
{
|
||
struct bfd_elf_section_data *esdo = elf_section_data (o);
|
||
if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
|
||
free (esdo->rel.hashes);
|
||
if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
|
||
free (esdo->rela.hashes);
|
||
}
|
||
}
|
||
|
||
/* Do the final step of an ELF link. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd_boolean dynamic;
|
||
bfd_boolean emit_relocs;
|
||
bfd *dynobj;
|
||
struct elf_final_link_info flinfo;
|
||
asection *o;
|
||
struct bfd_link_order *p;
|
||
bfd *sub;
|
||
bfd_size_type max_contents_size;
|
||
bfd_size_type max_external_reloc_size;
|
||
bfd_size_type max_internal_reloc_count;
|
||
bfd_size_type max_sym_count;
|
||
bfd_size_type max_sym_shndx_count;
|
||
Elf_Internal_Sym elfsym;
|
||
unsigned int i;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Shdr *symtab_shndx_hdr;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct elf_outext_info eoinfo;
|
||
bfd_boolean merged;
|
||
size_t relativecount = 0;
|
||
asection *reldyn = 0;
|
||
bfd_size_type amt;
|
||
asection *attr_section = NULL;
|
||
bfd_vma attr_size = 0;
|
||
const char *std_attrs_section;
|
||
|
||
if (! is_elf_hash_table (info->hash))
|
||
return FALSE;
|
||
|
||
if (info->shared)
|
||
abfd->flags |= DYNAMIC;
|
||
|
||
dynamic = elf_hash_table (info)->dynamic_sections_created;
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
emit_relocs = (info->relocatable
|
||
|| info->emitrelocations);
|
||
|
||
flinfo.info = info;
|
||
flinfo.output_bfd = abfd;
|
||
flinfo.symstrtab = _bfd_elf_strtab_init ();
|
||
if (flinfo.symstrtab == NULL)
|
||
return FALSE;
|
||
|
||
if (! dynamic)
|
||
{
|
||
flinfo.dynsym_sec = NULL;
|
||
flinfo.hash_sec = NULL;
|
||
flinfo.symver_sec = NULL;
|
||
}
|
||
else
|
||
{
|
||
flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
|
||
flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
|
||
/* Note that dynsym_sec can be NULL (on VMS). */
|
||
flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
|
||
/* Note that it is OK if symver_sec is NULL. */
|
||
}
|
||
|
||
flinfo.contents = NULL;
|
||
flinfo.external_relocs = NULL;
|
||
flinfo.internal_relocs = NULL;
|
||
flinfo.external_syms = NULL;
|
||
flinfo.locsym_shndx = NULL;
|
||
flinfo.internal_syms = NULL;
|
||
flinfo.indices = NULL;
|
||
flinfo.sections = NULL;
|
||
flinfo.symshndxbuf = NULL;
|
||
flinfo.filesym_count = 0;
|
||
|
||
/* The object attributes have been merged. Remove the input
|
||
sections from the link, and set the contents of the output
|
||
secton. */
|
||
std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
|
||
|| strcmp (o->name, ".gnu.attributes") == 0)
|
||
{
|
||
for (p = o->map_head.link_order; p != NULL; p = p->next)
|
||
{
|
||
asection *input_section;
|
||
|
||
if (p->type != bfd_indirect_link_order)
|
||
continue;
|
||
input_section = p->u.indirect.section;
|
||
/* Hack: reset the SEC_HAS_CONTENTS flag so that
|
||
elf_link_input_bfd ignores this section. */
|
||
input_section->flags &= ~SEC_HAS_CONTENTS;
|
||
}
|
||
|
||
attr_size = bfd_elf_obj_attr_size (abfd);
|
||
if (attr_size)
|
||
{
|
||
bfd_set_section_size (abfd, o, attr_size);
|
||
attr_section = o;
|
||
/* Skip this section later on. */
|
||
o->map_head.link_order = NULL;
|
||
}
|
||
else
|
||
o->flags |= SEC_EXCLUDE;
|
||
}
|
||
}
|
||
|
||
/* Count up the number of relocations we will output for each output
|
||
section, so that we know the sizes of the reloc sections. We
|
||
also figure out some maximum sizes. */
|
||
max_contents_size = 0;
|
||
max_external_reloc_size = 0;
|
||
max_internal_reloc_count = 0;
|
||
max_sym_count = 0;
|
||
max_sym_shndx_count = 0;
|
||
merged = FALSE;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
struct bfd_elf_section_data *esdo = elf_section_data (o);
|
||
o->reloc_count = 0;
|
||
|
||
for (p = o->map_head.link_order; p != NULL; p = p->next)
|
||
{
|
||
unsigned int reloc_count = 0;
|
||
struct bfd_elf_section_data *esdi = NULL;
|
||
|
||
if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
reloc_count = 1;
|
||
else if (p->type == bfd_indirect_link_order)
|
||
{
|
||
asection *sec;
|
||
|
||
sec = p->u.indirect.section;
|
||
esdi = elf_section_data (sec);
|
||
|
||
/* Mark all sections which are to be included in the
|
||
link. This will normally be every section. We need
|
||
to do this so that we can identify any sections which
|
||
the linker has decided to not include. */
|
||
sec->linker_mark = TRUE;
|
||
|
||
if (sec->flags & SEC_MERGE)
|
||
merged = TRUE;
|
||
|
||
if (esdo->this_hdr.sh_type == SHT_REL
|
||
|| esdo->this_hdr.sh_type == SHT_RELA)
|
||
/* Some backends use reloc_count in relocation sections
|
||
to count particular types of relocs. Of course,
|
||
reloc sections themselves can't have relocations. */
|
||
reloc_count = 0;
|
||
else if (info->relocatable || info->emitrelocations)
|
||
reloc_count = sec->reloc_count;
|
||
else if (bed->elf_backend_count_relocs)
|
||
reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
|
||
|
||
if (sec->rawsize > max_contents_size)
|
||
max_contents_size = sec->rawsize;
|
||
if (sec->size > max_contents_size)
|
||
max_contents_size = sec->size;
|
||
|
||
/* We are interested in just local symbols, not all
|
||
symbols. */
|
||
if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
|
||
&& (sec->owner->flags & DYNAMIC) == 0)
|
||
{
|
||
size_t sym_count;
|
||
|
||
if (elf_bad_symtab (sec->owner))
|
||
sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
|
||
/ bed->s->sizeof_sym);
|
||
else
|
||
sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
|
||
|
||
if (sym_count > max_sym_count)
|
||
max_sym_count = sym_count;
|
||
|
||
if (sym_count > max_sym_shndx_count
|
||
&& elf_symtab_shndx (sec->owner) != 0)
|
||
max_sym_shndx_count = sym_count;
|
||
|
||
if ((sec->flags & SEC_RELOC) != 0)
|
||
{
|
||
size_t ext_size = 0;
|
||
|
||
if (esdi->rel.hdr != NULL)
|
||
ext_size = esdi->rel.hdr->sh_size;
|
||
if (esdi->rela.hdr != NULL)
|
||
ext_size += esdi->rela.hdr->sh_size;
|
||
|
||
if (ext_size > max_external_reloc_size)
|
||
max_external_reloc_size = ext_size;
|
||
if (sec->reloc_count > max_internal_reloc_count)
|
||
max_internal_reloc_count = sec->reloc_count;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (reloc_count == 0)
|
||
continue;
|
||
|
||
o->reloc_count += reloc_count;
|
||
|
||
if (p->type == bfd_indirect_link_order
|
||
&& (info->relocatable || info->emitrelocations))
|
||
{
|
||
if (esdi->rel.hdr)
|
||
esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
|
||
if (esdi->rela.hdr)
|
||
esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
|
||
}
|
||
else
|
||
{
|
||
if (o->use_rela_p)
|
||
esdo->rela.count += reloc_count;
|
||
else
|
||
esdo->rel.count += reloc_count;
|
||
}
|
||
}
|
||
|
||
if (o->reloc_count > 0)
|
||
o->flags |= SEC_RELOC;
|
||
else
|
||
{
|
||
/* Explicitly clear the SEC_RELOC flag. The linker tends to
|
||
set it (this is probably a bug) and if it is set
|
||
assign_section_numbers will create a reloc section. */
|
||
o->flags &=~ SEC_RELOC;
|
||
}
|
||
|
||
/* If the SEC_ALLOC flag is not set, force the section VMA to
|
||
zero. This is done in elf_fake_sections as well, but forcing
|
||
the VMA to 0 here will ensure that relocs against these
|
||
sections are handled correctly. */
|
||
if ((o->flags & SEC_ALLOC) == 0
|
||
&& ! o->user_set_vma)
|
||
o->vma = 0;
|
||
}
|
||
|
||
if (! info->relocatable && merged)
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_link_sec_merge_syms, abfd);
|
||
|
||
/* Figure out the file positions for everything but the symbol table
|
||
and the relocs. We set symcount to force assign_section_numbers
|
||
to create a symbol table. */
|
||
bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
|
||
BFD_ASSERT (! abfd->output_has_begun);
|
||
if (! _bfd_elf_compute_section_file_positions (abfd, info))
|
||
goto error_return;
|
||
|
||
/* Set sizes, and assign file positions for reloc sections. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
struct bfd_elf_section_data *esdo = elf_section_data (o);
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
if (esdo->rel.hdr
|
||
&& !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
|
||
goto error_return;
|
||
|
||
if (esdo->rela.hdr
|
||
&& !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
|
||
goto error_return;
|
||
}
|
||
|
||
/* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
|
||
to count upwards while actually outputting the relocations. */
|
||
esdo->rel.count = 0;
|
||
esdo->rela.count = 0;
|
||
|
||
if (esdo->this_hdr.sh_offset == (file_ptr) -1)
|
||
{
|
||
/* Cache the section contents so that they can be compressed
|
||
later. Use bfd_malloc since it will be freed by
|
||
bfd_compress_section_contents. */
|
||
unsigned char *contents = esdo->this_hdr.contents;
|
||
if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
|
||
abort ();
|
||
contents
|
||
= (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
|
||
if (contents == NULL)
|
||
goto error_return;
|
||
esdo->this_hdr.contents = contents;
|
||
}
|
||
}
|
||
|
||
/* We have now assigned file positions for all the sections except
|
||
.symtab, .strtab, and non-loaded reloc sections. We start the
|
||
.symtab section at the current file position, and write directly
|
||
to it. We build the .strtab section in memory. */
|
||
bfd_get_symcount (abfd) = 0;
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
/* sh_name is set in prep_headers. */
|
||
symtab_hdr->sh_type = SHT_SYMTAB;
|
||
/* sh_flags, sh_addr and sh_size all start off zero. */
|
||
symtab_hdr->sh_entsize = bed->s->sizeof_sym;
|
||
/* sh_link is set in assign_section_numbers. */
|
||
/* sh_info is set below. */
|
||
/* sh_offset is set just below. */
|
||
symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
|
||
|
||
if (max_sym_count < 20)
|
||
max_sym_count = 20;
|
||
elf_hash_table (info)->strtabsize = max_sym_count;
|
||
amt = max_sym_count * sizeof (struct elf_sym_strtab);
|
||
elf_hash_table (info)->strtab
|
||
= (struct elf_sym_strtab *) bfd_malloc (amt);
|
||
if (elf_hash_table (info)->strtab == NULL)
|
||
goto error_return;
|
||
/* The real buffer will be allocated in elf_link_swap_symbols_out. */
|
||
flinfo.symshndxbuf
|
||
= (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
|
||
? (Elf_External_Sym_Shndx *) -1 : NULL);
|
||
|
||
if (info->strip != strip_all || emit_relocs)
|
||
{
|
||
file_ptr off = elf_next_file_pos (abfd);
|
||
|
||
_bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
|
||
|
||
/* Note that at this point elf_next_file_pos (abfd) is
|
||
incorrect. We do not yet know the size of the .symtab section.
|
||
We correct next_file_pos below, after we do know the size. */
|
||
|
||
/* Start writing out the symbol table. The first symbol is always a
|
||
dummy symbol. */
|
||
elfsym.st_value = 0;
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = 0;
|
||
elfsym.st_other = 0;
|
||
elfsym.st_shndx = SHN_UNDEF;
|
||
elfsym.st_target_internal = 0;
|
||
if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
|
||
bfd_und_section_ptr, NULL) != 1)
|
||
goto error_return;
|
||
|
||
/* Output a symbol for each section. We output these even if we are
|
||
discarding local symbols, since they are used for relocs. These
|
||
symbols have no names. We store the index of each one in the
|
||
index field of the section, so that we can find it again when
|
||
outputting relocs. */
|
||
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
|
||
elfsym.st_other = 0;
|
||
elfsym.st_value = 0;
|
||
elfsym.st_target_internal = 0;
|
||
for (i = 1; i < elf_numsections (abfd); i++)
|
||
{
|
||
o = bfd_section_from_elf_index (abfd, i);
|
||
if (o != NULL)
|
||
{
|
||
o->target_index = bfd_get_symcount (abfd);
|
||
elfsym.st_shndx = i;
|
||
if (!info->relocatable)
|
||
elfsym.st_value = o->vma;
|
||
if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
|
||
NULL) != 1)
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Allocate some memory to hold information read in from the input
|
||
files. */
|
||
if (max_contents_size != 0)
|
||
{
|
||
flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
|
||
if (flinfo.contents == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_external_reloc_size != 0)
|
||
{
|
||
flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
|
||
if (flinfo.external_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_internal_reloc_count != 0)
|
||
{
|
||
amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
|
||
amt *= sizeof (Elf_Internal_Rela);
|
||
flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
|
||
if (flinfo.internal_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_sym_count != 0)
|
||
{
|
||
amt = max_sym_count * bed->s->sizeof_sym;
|
||
flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
|
||
if (flinfo.external_syms == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (Elf_Internal_Sym);
|
||
flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
|
||
if (flinfo.internal_syms == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (long);
|
||
flinfo.indices = (long int *) bfd_malloc (amt);
|
||
if (flinfo.indices == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (asection *);
|
||
flinfo.sections = (asection **) bfd_malloc (amt);
|
||
if (flinfo.sections == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_sym_shndx_count != 0)
|
||
{
|
||
amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
|
||
flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
|
||
if (flinfo.locsym_shndx == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (elf_hash_table (info)->tls_sec)
|
||
{
|
||
bfd_vma base, end = 0;
|
||
asection *sec;
|
||
|
||
for (sec = elf_hash_table (info)->tls_sec;
|
||
sec && (sec->flags & SEC_THREAD_LOCAL);
|
||
sec = sec->next)
|
||
{
|
||
bfd_size_type size = sec->size;
|
||
|
||
if (size == 0
|
||
&& (sec->flags & SEC_HAS_CONTENTS) == 0)
|
||
{
|
||
struct bfd_link_order *ord = sec->map_tail.link_order;
|
||
|
||
if (ord != NULL)
|
||
size = ord->offset + ord->size;
|
||
}
|
||
end = sec->vma + size;
|
||
}
|
||
base = elf_hash_table (info)->tls_sec->vma;
|
||
/* Only align end of TLS section if static TLS doesn't have special
|
||
alignment requirements. */
|
||
if (bed->static_tls_alignment == 1)
|
||
end = align_power (end,
|
||
elf_hash_table (info)->tls_sec->alignment_power);
|
||
elf_hash_table (info)->tls_size = end - base;
|
||
}
|
||
|
||
/* Reorder SHF_LINK_ORDER sections. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if (!elf_fixup_link_order (abfd, o))
|
||
return FALSE;
|
||
}
|
||
|
||
if (!_bfd_elf_fixup_eh_frame_hdr (info))
|
||
return FALSE;
|
||
|
||
/* Since ELF permits relocations to be against local symbols, we
|
||
must have the local symbols available when we do the relocations.
|
||
Since we would rather only read the local symbols once, and we
|
||
would rather not keep them in memory, we handle all the
|
||
relocations for a single input file at the same time.
|
||
|
||
Unfortunately, there is no way to know the total number of local
|
||
symbols until we have seen all of them, and the local symbol
|
||
indices precede the global symbol indices. This means that when
|
||
we are generating relocatable output, and we see a reloc against
|
||
a global symbol, we can not know the symbol index until we have
|
||
finished examining all the local symbols to see which ones we are
|
||
going to output. To deal with this, we keep the relocations in
|
||
memory, and don't output them until the end of the link. This is
|
||
an unfortunate waste of memory, but I don't see a good way around
|
||
it. Fortunately, it only happens when performing a relocatable
|
||
link, which is not the common case. FIXME: If keep_memory is set
|
||
we could write the relocs out and then read them again; I don't
|
||
know how bad the memory loss will be. */
|
||
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
|
||
sub->output_has_begun = FALSE;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
for (p = o->map_head.link_order; p != NULL; p = p->next)
|
||
{
|
||
if (p->type == bfd_indirect_link_order
|
||
&& (bfd_get_flavour ((sub = p->u.indirect.section->owner))
|
||
== bfd_target_elf_flavour)
|
||
&& elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
|
||
{
|
||
if (! sub->output_has_begun)
|
||
{
|
||
if (! elf_link_input_bfd (&flinfo, sub))
|
||
goto error_return;
|
||
sub->output_has_begun = TRUE;
|
||
}
|
||
}
|
||
else if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
{
|
||
if (! elf_reloc_link_order (abfd, info, o, p))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
if (! _bfd_default_link_order (abfd, info, o, p))
|
||
{
|
||
if (p->type == bfd_indirect_link_order
|
||
&& (bfd_get_flavour (sub)
|
||
== bfd_target_elf_flavour)
|
||
&& (elf_elfheader (sub)->e_ident[EI_CLASS]
|
||
!= bed->s->elfclass))
|
||
{
|
||
const char *iclass, *oclass;
|
||
|
||
if (bed->s->elfclass == ELFCLASS64)
|
||
{
|
||
iclass = "ELFCLASS32";
|
||
oclass = "ELFCLASS64";
|
||
}
|
||
else
|
||
{
|
||
iclass = "ELFCLASS64";
|
||
oclass = "ELFCLASS32";
|
||
}
|
||
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
(*_bfd_error_handler)
|
||
(_("%B: file class %s incompatible with %s"),
|
||
sub, iclass, oclass);
|
||
}
|
||
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Free symbol buffer if needed. */
|
||
if (!info->reduce_memory_overheads)
|
||
{
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
|
||
if (bfd_get_flavour (sub) == bfd_target_elf_flavour
|
||
&& elf_tdata (sub)->symbuf)
|
||
{
|
||
free (elf_tdata (sub)->symbuf);
|
||
elf_tdata (sub)->symbuf = NULL;
|
||
}
|
||
}
|
||
|
||
/* Output any global symbols that got converted to local in a
|
||
version script or due to symbol visibility. We do this in a
|
||
separate step since ELF requires all local symbols to appear
|
||
prior to any global symbols. FIXME: We should only do this if
|
||
some global symbols were, in fact, converted to become local.
|
||
FIXME: Will this work correctly with the Irix 5 linker? */
|
||
eoinfo.failed = FALSE;
|
||
eoinfo.flinfo = &flinfo;
|
||
eoinfo.localsyms = TRUE;
|
||
eoinfo.file_sym_done = FALSE;
|
||
bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
|
||
if (eoinfo.failed)
|
||
return FALSE;
|
||
|
||
/* If backend needs to output some local symbols not present in the hash
|
||
table, do it now. */
|
||
if (bed->elf_backend_output_arch_local_syms
|
||
&& (info->strip != strip_all || emit_relocs))
|
||
{
|
||
typedef int (*out_sym_func)
|
||
(void *, const char *, Elf_Internal_Sym *, asection *,
|
||
struct elf_link_hash_entry *);
|
||
|
||
if (! ((*bed->elf_backend_output_arch_local_syms)
|
||
(abfd, info, &flinfo,
|
||
(out_sym_func) elf_link_output_symstrtab)))
|
||
return FALSE;
|
||
}
|
||
|
||
/* That wrote out all the local symbols. Finish up the symbol table
|
||
with the global symbols. Even if we want to strip everything we
|
||
can, we still need to deal with those global symbols that got
|
||
converted to local in a version script. */
|
||
|
||
/* The sh_info field records the index of the first non local symbol. */
|
||
symtab_hdr->sh_info = bfd_get_symcount (abfd);
|
||
|
||
if (dynamic
|
||
&& flinfo.dynsym_sec != NULL
|
||
&& flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
|
||
{
|
||
Elf_Internal_Sym sym;
|
||
bfd_byte *dynsym = flinfo.dynsym_sec->contents;
|
||
long last_local = 0;
|
||
|
||
/* Write out the section symbols for the output sections. */
|
||
if (info->shared || elf_hash_table (info)->is_relocatable_executable)
|
||
{
|
||
asection *s;
|
||
|
||
sym.st_size = 0;
|
||
sym.st_name = 0;
|
||
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
|
||
sym.st_other = 0;
|
||
sym.st_target_internal = 0;
|
||
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
int indx;
|
||
bfd_byte *dest;
|
||
long dynindx;
|
||
|
||
dynindx = elf_section_data (s)->dynindx;
|
||
if (dynindx <= 0)
|
||
continue;
|
||
indx = elf_section_data (s)->this_idx;
|
||
BFD_ASSERT (indx > 0);
|
||
sym.st_shndx = indx;
|
||
if (! check_dynsym (abfd, &sym))
|
||
return FALSE;
|
||
sym.st_value = s->vma;
|
||
dest = dynsym + dynindx * bed->s->sizeof_sym;
|
||
if (last_local < dynindx)
|
||
last_local = dynindx;
|
||
bed->s->swap_symbol_out (abfd, &sym, dest, 0);
|
||
}
|
||
}
|
||
|
||
/* Write out the local dynsyms. */
|
||
if (elf_hash_table (info)->dynlocal)
|
||
{
|
||
struct elf_link_local_dynamic_entry *e;
|
||
for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
|
||
{
|
||
asection *s;
|
||
bfd_byte *dest;
|
||
|
||
/* Copy the internal symbol and turn off visibility.
|
||
Note that we saved a word of storage and overwrote
|
||
the original st_name with the dynstr_index. */
|
||
sym = e->isym;
|
||
sym.st_other &= ~ELF_ST_VISIBILITY (-1);
|
||
|
||
s = bfd_section_from_elf_index (e->input_bfd,
|
||
e->isym.st_shndx);
|
||
if (s != NULL)
|
||
{
|
||
sym.st_shndx =
|
||
elf_section_data (s->output_section)->this_idx;
|
||
if (! check_dynsym (abfd, &sym))
|
||
return FALSE;
|
||
sym.st_value = (s->output_section->vma
|
||
+ s->output_offset
|
||
+ e->isym.st_value);
|
||
}
|
||
|
||
if (last_local < e->dynindx)
|
||
last_local = e->dynindx;
|
||
|
||
dest = dynsym + e->dynindx * bed->s->sizeof_sym;
|
||
bed->s->swap_symbol_out (abfd, &sym, dest, 0);
|
||
}
|
||
}
|
||
|
||
elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
|
||
last_local + 1;
|
||
}
|
||
|
||
/* We get the global symbols from the hash table. */
|
||
eoinfo.failed = FALSE;
|
||
eoinfo.localsyms = FALSE;
|
||
eoinfo.flinfo = &flinfo;
|
||
bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
|
||
if (eoinfo.failed)
|
||
return FALSE;
|
||
|
||
/* If backend needs to output some symbols not present in the hash
|
||
table, do it now. */
|
||
if (bed->elf_backend_output_arch_syms
|
||
&& (info->strip != strip_all || emit_relocs))
|
||
{
|
||
typedef int (*out_sym_func)
|
||
(void *, const char *, Elf_Internal_Sym *, asection *,
|
||
struct elf_link_hash_entry *);
|
||
|
||
if (! ((*bed->elf_backend_output_arch_syms)
|
||
(abfd, info, &flinfo,
|
||
(out_sym_func) elf_link_output_symstrtab)))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Finalize the .strtab section. */
|
||
_bfd_elf_strtab_finalize (flinfo.symstrtab);
|
||
|
||
/* Swap out the .strtab section. */
|
||
if (!elf_link_swap_symbols_out (&flinfo))
|
||
return FALSE;
|
||
|
||
/* Now we know the size of the symtab section. */
|
||
if (bfd_get_symcount (abfd) > 0)
|
||
{
|
||
/* Finish up and write out the symbol string table (.strtab)
|
||
section. */
|
||
Elf_Internal_Shdr *symstrtab_hdr;
|
||
file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
|
||
|
||
symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
|
||
if (symtab_shndx_hdr->sh_name != 0)
|
||
{
|
||
symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
|
||
symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
|
||
symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
|
||
amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
|
||
symtab_shndx_hdr->sh_size = amt;
|
||
|
||
off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
|
||
off, TRUE);
|
||
|
||
if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
|
||
return FALSE;
|
||
}
|
||
|
||
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
|
||
/* sh_name was set in prep_headers. */
|
||
symstrtab_hdr->sh_type = SHT_STRTAB;
|
||
symstrtab_hdr->sh_flags = 0;
|
||
symstrtab_hdr->sh_addr = 0;
|
||
symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
|
||
symstrtab_hdr->sh_entsize = 0;
|
||
symstrtab_hdr->sh_link = 0;
|
||
symstrtab_hdr->sh_info = 0;
|
||
/* sh_offset is set just below. */
|
||
symstrtab_hdr->sh_addralign = 1;
|
||
|
||
off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
|
||
off, TRUE);
|
||
elf_next_file_pos (abfd) = off;
|
||
|
||
if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Adjust the relocs to have the correct symbol indices. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
struct bfd_elf_section_data *esdo = elf_section_data (o);
|
||
bfd_boolean sort;
|
||
if ((o->flags & SEC_RELOC) == 0)
|
||
continue;
|
||
|
||
sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
|
||
if (esdo->rel.hdr != NULL)
|
||
elf_link_adjust_relocs (abfd, &esdo->rel, sort);
|
||
if (esdo->rela.hdr != NULL)
|
||
elf_link_adjust_relocs (abfd, &esdo->rela, sort);
|
||
|
||
/* Set the reloc_count field to 0 to prevent write_relocs from
|
||
trying to swap the relocs out itself. */
|
||
o->reloc_count = 0;
|
||
}
|
||
|
||
if (dynamic && info->combreloc && dynobj != NULL)
|
||
relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
|
||
|
||
/* If we are linking against a dynamic object, or generating a
|
||
shared library, finish up the dynamic linking information. */
|
||
if (dynamic)
|
||
{
|
||
bfd_byte *dyncon, *dynconend;
|
||
|
||
/* Fix up .dynamic entries. */
|
||
o = bfd_get_linker_section (dynobj, ".dynamic");
|
||
BFD_ASSERT (o != NULL);
|
||
|
||
dyncon = o->contents;
|
||
dynconend = o->contents + o->size;
|
||
for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
const char *name;
|
||
unsigned int type;
|
||
|
||
bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
switch (dyn.d_tag)
|
||
{
|
||
default:
|
||
continue;
|
||
case DT_NULL:
|
||
if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
|
||
{
|
||
switch (elf_section_data (reldyn)->this_hdr.sh_type)
|
||
{
|
||
case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
|
||
case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
|
||
default: continue;
|
||
}
|
||
dyn.d_un.d_val = relativecount;
|
||
relativecount = 0;
|
||
break;
|
||
}
|
||
continue;
|
||
|
||
case DT_INIT:
|
||
name = info->init_function;
|
||
goto get_sym;
|
||
case DT_FINI:
|
||
name = info->fini_function;
|
||
get_sym:
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name,
|
||
FALSE, FALSE, TRUE);
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
dyn.d_un.d_ptr = h->root.u.def.value;
|
||
o = h->root.u.def.section;
|
||
if (o->output_section != NULL)
|
||
dyn.d_un.d_ptr += (o->output_section->vma
|
||
+ o->output_offset);
|
||
else
|
||
{
|
||
/* The symbol is imported from another shared
|
||
library and does not apply to this one. */
|
||
dyn.d_un.d_ptr = 0;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
continue;
|
||
|
||
case DT_PREINIT_ARRAYSZ:
|
||
name = ".preinit_array";
|
||
goto get_size;
|
||
case DT_INIT_ARRAYSZ:
|
||
name = ".init_array";
|
||
goto get_size;
|
||
case DT_FINI_ARRAYSZ:
|
||
name = ".fini_array";
|
||
get_size:
|
||
o = bfd_get_section_by_name (abfd, name);
|
||
if (o == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: could not find output section %s"), abfd, name);
|
||
goto error_return;
|
||
}
|
||
if (o->size == 0)
|
||
(*_bfd_error_handler)
|
||
(_("warning: %s section has zero size"), name);
|
||
dyn.d_un.d_val = o->size;
|
||
break;
|
||
|
||
case DT_PREINIT_ARRAY:
|
||
name = ".preinit_array";
|
||
goto get_vma;
|
||
case DT_INIT_ARRAY:
|
||
name = ".init_array";
|
||
goto get_vma;
|
||
case DT_FINI_ARRAY:
|
||
name = ".fini_array";
|
||
goto get_vma;
|
||
|
||
case DT_HASH:
|
||
name = ".hash";
|
||
goto get_vma;
|
||
case DT_GNU_HASH:
|
||
name = ".gnu.hash";
|
||
goto get_vma;
|
||
case DT_STRTAB:
|
||
name = ".dynstr";
|
||
goto get_vma;
|
||
case DT_SYMTAB:
|
||
name = ".dynsym";
|
||
goto get_vma;
|
||
case DT_VERDEF:
|
||
name = ".gnu.version_d";
|
||
goto get_vma;
|
||
case DT_VERNEED:
|
||
name = ".gnu.version_r";
|
||
goto get_vma;
|
||
case DT_VERSYM:
|
||
name = ".gnu.version";
|
||
get_vma:
|
||
o = bfd_get_section_by_name (abfd, name);
|
||
if (o == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: could not find output section %s"), abfd, name);
|
||
goto error_return;
|
||
}
|
||
if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("warning: section '%s' is being made into a note"), name);
|
||
bfd_set_error (bfd_error_nonrepresentable_section);
|
||
goto error_return;
|
||
}
|
||
dyn.d_un.d_ptr = o->vma;
|
||
break;
|
||
|
||
case DT_REL:
|
||
case DT_RELA:
|
||
case DT_RELSZ:
|
||
case DT_RELASZ:
|
||
if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
|
||
type = SHT_REL;
|
||
else
|
||
type = SHT_RELA;
|
||
dyn.d_un.d_val = 0;
|
||
dyn.d_un.d_ptr = 0;
|
||
for (i = 1; i < elf_numsections (abfd); i++)
|
||
{
|
||
Elf_Internal_Shdr *hdr;
|
||
|
||
hdr = elf_elfsections (abfd)[i];
|
||
if (hdr->sh_type == type
|
||
&& (hdr->sh_flags & SHF_ALLOC) != 0)
|
||
{
|
||
if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
|
||
dyn.d_un.d_val += hdr->sh_size;
|
||
else
|
||
{
|
||
if (dyn.d_un.d_ptr == 0
|
||
|| hdr->sh_addr < dyn.d_un.d_ptr)
|
||
dyn.d_un.d_ptr = hdr->sh_addr;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
|
||
}
|
||
}
|
||
|
||
/* If we have created any dynamic sections, then output them. */
|
||
if (dynobj != NULL)
|
||
{
|
||
if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
|
||
goto error_return;
|
||
|
||
/* Check for DT_TEXTREL (late, in case the backend removes it). */
|
||
if (((info->warn_shared_textrel && info->shared)
|
||
|| info->error_textrel)
|
||
&& (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
|
||
{
|
||
bfd_byte *dyncon, *dynconend;
|
||
|
||
dyncon = o->contents;
|
||
dynconend = o->contents + o->size;
|
||
for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
if (dyn.d_tag == DT_TEXTREL)
|
||
{
|
||
if (info->error_textrel)
|
||
info->callbacks->einfo
|
||
(_("%P%X: read-only segment has dynamic relocations.\n"));
|
||
else
|
||
info->callbacks->einfo
|
||
(_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
for (o = dynobj->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_HAS_CONTENTS) == 0
|
||
|| o->size == 0
|
||
|| o->output_section == bfd_abs_section_ptr)
|
||
continue;
|
||
if ((o->flags & SEC_LINKER_CREATED) == 0)
|
||
{
|
||
/* At this point, we are only interested in sections
|
||
created by _bfd_elf_link_create_dynamic_sections. */
|
||
continue;
|
||
}
|
||
if (elf_hash_table (info)->stab_info.stabstr == o)
|
||
continue;
|
||
if (elf_hash_table (info)->eh_info.hdr_sec == o)
|
||
continue;
|
||
if (strcmp (o->name, ".dynstr") != 0)
|
||
{
|
||
/* FIXME: octets_per_byte. */
|
||
if (! bfd_set_section_contents (abfd, o->output_section,
|
||
o->contents,
|
||
(file_ptr) o->output_offset,
|
||
o->size))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
/* The contents of the .dynstr section are actually in a
|
||
stringtab. */
|
||
file_ptr off;
|
||
|
||
off = elf_section_data (o->output_section)->this_hdr.sh_offset;
|
||
if (bfd_seek (abfd, off, SEEK_SET) != 0
|
||
|| ! _bfd_elf_strtab_emit (abfd,
|
||
elf_hash_table (info)->dynstr))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (info->relocatable)
|
||
{
|
||
bfd_boolean failed = FALSE;
|
||
|
||
bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
|
||
if (failed)
|
||
goto error_return;
|
||
}
|
||
|
||
/* If we have optimized stabs strings, output them. */
|
||
if (elf_hash_table (info)->stab_info.stabstr != NULL)
|
||
{
|
||
if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
|
||
goto error_return;
|
||
}
|
||
|
||
if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
|
||
goto error_return;
|
||
|
||
elf_final_link_free (abfd, &flinfo);
|
||
|
||
elf_linker (abfd) = TRUE;
|
||
|
||
if (attr_section)
|
||
{
|
||
bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
|
||
if (contents == NULL)
|
||
return FALSE; /* Bail out and fail. */
|
||
bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
|
||
bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
|
||
free (contents);
|
||
}
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
elf_final_link_free (abfd, &flinfo);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Initialize COOKIE for input bfd ABFD. */
|
||
|
||
static bfd_boolean
|
||
init_reloc_cookie (struct elf_reloc_cookie *cookie,
|
||
struct bfd_link_info *info, bfd *abfd)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
const struct elf_backend_data *bed;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
|
||
cookie->abfd = abfd;
|
||
cookie->sym_hashes = elf_sym_hashes (abfd);
|
||
cookie->bad_symtab = elf_bad_symtab (abfd);
|
||
if (cookie->bad_symtab)
|
||
{
|
||
cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
|
||
cookie->extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
cookie->locsymcount = symtab_hdr->sh_info;
|
||
cookie->extsymoff = symtab_hdr->sh_info;
|
||
}
|
||
|
||
if (bed->s->arch_size == 32)
|
||
cookie->r_sym_shift = 8;
|
||
else
|
||
cookie->r_sym_shift = 32;
|
||
|
||
cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (cookie->locsyms == NULL && cookie->locsymcount != 0)
|
||
{
|
||
cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
|
||
cookie->locsymcount, 0,
|
||
NULL, NULL, NULL);
|
||
if (cookie->locsyms == NULL)
|
||
{
|
||
info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
|
||
return FALSE;
|
||
}
|
||
if (info->keep_memory)
|
||
symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Free the memory allocated by init_reloc_cookie, if appropriate. */
|
||
|
||
static void
|
||
fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
if (cookie->locsyms != NULL
|
||
&& symtab_hdr->contents != (unsigned char *) cookie->locsyms)
|
||
free (cookie->locsyms);
|
||
}
|
||
|
||
/* Initialize the relocation information in COOKIE for input section SEC
|
||
of input bfd ABFD. */
|
||
|
||
static bfd_boolean
|
||
init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
|
||
struct bfd_link_info *info, bfd *abfd,
|
||
asection *sec)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
if (sec->reloc_count == 0)
|
||
{
|
||
cookie->rels = NULL;
|
||
cookie->relend = NULL;
|
||
}
|
||
else
|
||
{
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
|
||
info->keep_memory);
|
||
if (cookie->rels == NULL)
|
||
return FALSE;
|
||
cookie->rel = cookie->rels;
|
||
cookie->relend = (cookie->rels
|
||
+ sec->reloc_count * bed->s->int_rels_per_ext_rel);
|
||
}
|
||
cookie->rel = cookie->rels;
|
||
return TRUE;
|
||
}
|
||
|
||
/* Free the memory allocated by init_reloc_cookie_rels,
|
||
if appropriate. */
|
||
|
||
static void
|
||
fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
|
||
asection *sec)
|
||
{
|
||
if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
|
||
free (cookie->rels);
|
||
}
|
||
|
||
/* Initialize the whole of COOKIE for input section SEC. */
|
||
|
||
static bfd_boolean
|
||
init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
|
||
struct bfd_link_info *info,
|
||
asection *sec)
|
||
{
|
||
if (!init_reloc_cookie (cookie, info, sec->owner))
|
||
goto error1;
|
||
if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
|
||
goto error2;
|
||
return TRUE;
|
||
|
||
error2:
|
||
fini_reloc_cookie (cookie, sec->owner);
|
||
error1:
|
||
return FALSE;
|
||
}
|
||
|
||
/* Free the memory allocated by init_reloc_cookie_for_section,
|
||
if appropriate. */
|
||
|
||
static void
|
||
fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
|
||
asection *sec)
|
||
{
|
||
fini_reloc_cookie_rels (cookie, sec);
|
||
fini_reloc_cookie (cookie, sec->owner);
|
||
}
|
||
|
||
/* Garbage collect unused sections. */
|
||
|
||
/* Default gc_mark_hook. */
|
||
|
||
asection *
|
||
_bfd_elf_gc_mark_hook (asection *sec,
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED,
|
||
Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
const char *sec_name;
|
||
|
||
if (h != NULL)
|
||
{
|
||
switch (h->root.type)
|
||
{
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
return h->root.u.def.section;
|
||
|
||
case bfd_link_hash_common:
|
||
return h->root.u.c.p->section;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
/* To work around a glibc bug, keep all XXX input sections
|
||
when there is an as yet undefined reference to __start_XXX
|
||
or __stop_XXX symbols. The linker will later define such
|
||
symbols for orphan input sections that have a name
|
||
representable as a C identifier. */
|
||
if (strncmp (h->root.root.string, "__start_", 8) == 0)
|
||
sec_name = h->root.root.string + 8;
|
||
else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
|
||
sec_name = h->root.root.string + 7;
|
||
else
|
||
sec_name = NULL;
|
||
|
||
if (sec_name && *sec_name != '\0')
|
||
{
|
||
bfd *i;
|
||
|
||
for (i = info->input_bfds; i; i = i->link.next)
|
||
{
|
||
sec = bfd_get_section_by_name (i, sec_name);
|
||
if (sec)
|
||
sec->flags |= SEC_KEEP;
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* COOKIE->rel describes a relocation against section SEC, which is
|
||
a section we've decided to keep. Return the section that contains
|
||
the relocation symbol, or NULL if no section contains it. */
|
||
|
||
asection *
|
||
_bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
|
||
elf_gc_mark_hook_fn gc_mark_hook,
|
||
struct elf_reloc_cookie *cookie)
|
||
{
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
|
||
if (r_symndx == STN_UNDEF)
|
||
return NULL;
|
||
|
||
if (r_symndx >= cookie->locsymcount
|
||
|| ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
|
||
{
|
||
h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
|
||
if (h == NULL)
|
||
{
|
||
info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
|
||
sec->owner);
|
||
return NULL;
|
||
}
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
h->mark = 1;
|
||
/* If this symbol is weak and there is a non-weak definition, we
|
||
keep the non-weak definition because many backends put
|
||
dynamic reloc info on the non-weak definition for code
|
||
handling copy relocs. */
|
||
if (h->u.weakdef != NULL)
|
||
h->u.weakdef->mark = 1;
|
||
return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
|
||
}
|
||
|
||
return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
|
||
&cookie->locsyms[r_symndx]);
|
||
}
|
||
|
||
/* COOKIE->rel describes a relocation against section SEC, which is
|
||
a section we've decided to keep. Mark the section that contains
|
||
the relocation symbol. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
|
||
asection *sec,
|
||
elf_gc_mark_hook_fn gc_mark_hook,
|
||
struct elf_reloc_cookie *cookie)
|
||
{
|
||
asection *rsec;
|
||
|
||
rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
|
||
if (rsec && !rsec->gc_mark)
|
||
{
|
||
if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
|
||
|| (rsec->owner->flags & DYNAMIC) != 0)
|
||
rsec->gc_mark = 1;
|
||
else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
|
||
return FALSE;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* The mark phase of garbage collection. For a given section, mark
|
||
it and any sections in this section's group, and all the sections
|
||
which define symbols to which it refers. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_gc_mark (struct bfd_link_info *info,
|
||
asection *sec,
|
||
elf_gc_mark_hook_fn gc_mark_hook)
|
||
{
|
||
bfd_boolean ret;
|
||
asection *group_sec, *eh_frame;
|
||
|
||
sec->gc_mark = 1;
|
||
|
||
/* Mark all the sections in the group. */
|
||
group_sec = elf_section_data (sec)->next_in_group;
|
||
if (group_sec && !group_sec->gc_mark)
|
||
if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
|
||
return FALSE;
|
||
|
||
/* Look through the section relocs. */
|
||
ret = TRUE;
|
||
eh_frame = elf_eh_frame_section (sec->owner);
|
||
if ((sec->flags & SEC_RELOC) != 0
|
||
&& sec->reloc_count > 0
|
||
&& sec != eh_frame)
|
||
{
|
||
struct elf_reloc_cookie cookie;
|
||
|
||
if (!init_reloc_cookie_for_section (&cookie, info, sec))
|
||
ret = FALSE;
|
||
else
|
||
{
|
||
for (; cookie.rel < cookie.relend; cookie.rel++)
|
||
if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
|
||
{
|
||
ret = FALSE;
|
||
break;
|
||
}
|
||
fini_reloc_cookie_for_section (&cookie, sec);
|
||
}
|
||
}
|
||
|
||
if (ret && eh_frame && elf_fde_list (sec))
|
||
{
|
||
struct elf_reloc_cookie cookie;
|
||
|
||
if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
|
||
ret = FALSE;
|
||
else
|
||
{
|
||
if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
|
||
gc_mark_hook, &cookie))
|
||
ret = FALSE;
|
||
fini_reloc_cookie_for_section (&cookie, eh_frame);
|
||
}
|
||
}
|
||
|
||
eh_frame = elf_section_eh_frame_entry (sec);
|
||
if (ret && eh_frame && !eh_frame->gc_mark)
|
||
if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
|
||
ret = FALSE;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Scan and mark sections in a special or debug section group. */
|
||
|
||
static void
|
||
_bfd_elf_gc_mark_debug_special_section_group (asection *grp)
|
||
{
|
||
/* Point to first section of section group. */
|
||
asection *ssec;
|
||
/* Used to iterate the section group. */
|
||
asection *msec;
|
||
|
||
bfd_boolean is_special_grp = TRUE;
|
||
bfd_boolean is_debug_grp = TRUE;
|
||
|
||
/* First scan to see if group contains any section other than debug
|
||
and special section. */
|
||
ssec = msec = elf_next_in_group (grp);
|
||
do
|
||
{
|
||
if ((msec->flags & SEC_DEBUGGING) == 0)
|
||
is_debug_grp = FALSE;
|
||
|
||
if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
|
||
is_special_grp = FALSE;
|
||
|
||
msec = elf_next_in_group (msec);
|
||
}
|
||
while (msec != ssec);
|
||
|
||
/* If this is a pure debug section group or pure special section group,
|
||
keep all sections in this group. */
|
||
if (is_debug_grp || is_special_grp)
|
||
{
|
||
do
|
||
{
|
||
msec->gc_mark = 1;
|
||
msec = elf_next_in_group (msec);
|
||
}
|
||
while (msec != ssec);
|
||
}
|
||
}
|
||
|
||
/* Keep debug and special sections. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
|
||
elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
|
||
{
|
||
bfd *ibfd;
|
||
|
||
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
|
||
{
|
||
asection *isec;
|
||
bfd_boolean some_kept;
|
||
bfd_boolean debug_frag_seen;
|
||
|
||
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
/* Ensure all linker created sections are kept,
|
||
see if any other section is already marked,
|
||
and note if we have any fragmented debug sections. */
|
||
debug_frag_seen = some_kept = FALSE;
|
||
for (isec = ibfd->sections; isec != NULL; isec = isec->next)
|
||
{
|
||
if ((isec->flags & SEC_LINKER_CREATED) != 0)
|
||
isec->gc_mark = 1;
|
||
else if (isec->gc_mark)
|
||
some_kept = TRUE;
|
||
|
||
if (debug_frag_seen == FALSE
|
||
&& (isec->flags & SEC_DEBUGGING)
|
||
&& CONST_STRNEQ (isec->name, ".debug_line."))
|
||
debug_frag_seen = TRUE;
|
||
}
|
||
|
||
/* If no section in this file will be kept, then we can
|
||
toss out the debug and special sections. */
|
||
if (!some_kept)
|
||
continue;
|
||
|
||
/* Keep debug and special sections like .comment when they are
|
||
not part of a group. Also keep section groups that contain
|
||
just debug sections or special sections. */
|
||
for (isec = ibfd->sections; isec != NULL; isec = isec->next)
|
||
{
|
||
if ((isec->flags & SEC_GROUP) != 0)
|
||
_bfd_elf_gc_mark_debug_special_section_group (isec);
|
||
else if (((isec->flags & SEC_DEBUGGING) != 0
|
||
|| (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
|
||
&& elf_next_in_group (isec) == NULL)
|
||
isec->gc_mark = 1;
|
||
}
|
||
|
||
if (! debug_frag_seen)
|
||
continue;
|
||
|
||
/* Look for CODE sections which are going to be discarded,
|
||
and find and discard any fragmented debug sections which
|
||
are associated with that code section. */
|
||
for (isec = ibfd->sections; isec != NULL; isec = isec->next)
|
||
if ((isec->flags & SEC_CODE) != 0
|
||
&& isec->gc_mark == 0)
|
||
{
|
||
unsigned int ilen;
|
||
asection *dsec;
|
||
|
||
ilen = strlen (isec->name);
|
||
|
||
/* Association is determined by the name of the debug section
|
||
containing the name of the code section as a suffix. For
|
||
example .debug_line.text.foo is a debug section associated
|
||
with .text.foo. */
|
||
for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
|
||
{
|
||
unsigned int dlen;
|
||
|
||
if (dsec->gc_mark == 0
|
||
|| (dsec->flags & SEC_DEBUGGING) == 0)
|
||
continue;
|
||
|
||
dlen = strlen (dsec->name);
|
||
|
||
if (dlen > ilen
|
||
&& strncmp (dsec->name + (dlen - ilen),
|
||
isec->name, ilen) == 0)
|
||
{
|
||
dsec->gc_mark = 0;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
|
||
|
||
struct elf_gc_sweep_symbol_info
|
||
{
|
||
struct bfd_link_info *info;
|
||
void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
|
||
bfd_boolean);
|
||
};
|
||
|
||
static bfd_boolean
|
||
elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
if (!h->mark
|
||
&& (((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& !((h->def_regular || ELF_COMMON_DEF_P (h))
|
||
&& h->root.u.def.section->gc_mark))
|
||
|| h->root.type == bfd_link_hash_undefined
|
||
|| h->root.type == bfd_link_hash_undefweak))
|
||
{
|
||
struct elf_gc_sweep_symbol_info *inf;
|
||
|
||
inf = (struct elf_gc_sweep_symbol_info *) data;
|
||
(*inf->hide_symbol) (inf->info, h, TRUE);
|
||
h->def_regular = 0;
|
||
h->ref_regular = 0;
|
||
h->ref_regular_nonweak = 0;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* The sweep phase of garbage collection. Remove all garbage sections. */
|
||
|
||
typedef bfd_boolean (*gc_sweep_hook_fn)
|
||
(bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
|
||
|
||
static bfd_boolean
|
||
elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd *sub;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
|
||
unsigned long section_sym_count;
|
||
struct elf_gc_sweep_symbol_info sweep_info;
|
||
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
|
||
{
|
||
asection *o;
|
||
|
||
if (bfd_get_flavour (sub) != bfd_target_elf_flavour
|
||
|| !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
|
||
continue;
|
||
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
{
|
||
/* When any section in a section group is kept, we keep all
|
||
sections in the section group. If the first member of
|
||
the section group is excluded, we will also exclude the
|
||
group section. */
|
||
if (o->flags & SEC_GROUP)
|
||
{
|
||
asection *first = elf_next_in_group (o);
|
||
o->gc_mark = first->gc_mark;
|
||
}
|
||
|
||
if (o->gc_mark)
|
||
continue;
|
||
|
||
/* Skip sweeping sections already excluded. */
|
||
if (o->flags & SEC_EXCLUDE)
|
||
continue;
|
||
|
||
/* Since this is early in the link process, it is simple
|
||
to remove a section from the output. */
|
||
o->flags |= SEC_EXCLUDE;
|
||
|
||
if (info->print_gc_sections && o->size != 0)
|
||
_bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
|
||
|
||
/* But we also have to update some of the relocation
|
||
info we collected before. */
|
||
if (gc_sweep_hook
|
||
&& (o->flags & SEC_RELOC) != 0
|
||
&& o->reloc_count != 0
|
||
&& !((info->strip == strip_all || info->strip == strip_debugger)
|
||
&& (o->flags & SEC_DEBUGGING) != 0)
|
||
&& !bfd_is_abs_section (o->output_section))
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
bfd_boolean r;
|
||
|
||
internal_relocs
|
||
= _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
|
||
info->keep_memory);
|
||
if (internal_relocs == NULL)
|
||
return FALSE;
|
||
|
||
r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
|
||
|
||
if (elf_section_data (o)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
if (!r)
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Remove the symbols that were in the swept sections from the dynamic
|
||
symbol table. GCFIXME: Anyone know how to get them out of the
|
||
static symbol table as well? */
|
||
sweep_info.info = info;
|
||
sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
|
||
&sweep_info);
|
||
|
||
_bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
|
||
return TRUE;
|
||
}
|
||
|
||
/* Propagate collected vtable information. This is called through
|
||
elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
|
||
{
|
||
/* Those that are not vtables. */
|
||
if (h->vtable == NULL || h->vtable->parent == NULL)
|
||
return TRUE;
|
||
|
||
/* Those vtables that do not have parents, we cannot merge. */
|
||
if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
|
||
return TRUE;
|
||
|
||
/* If we've already been done, exit. */
|
||
if (h->vtable->used && h->vtable->used[-1])
|
||
return TRUE;
|
||
|
||
/* Make sure the parent's table is up to date. */
|
||
elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
|
||
|
||
if (h->vtable->used == NULL)
|
||
{
|
||
/* None of this table's entries were referenced. Re-use the
|
||
parent's table. */
|
||
h->vtable->used = h->vtable->parent->vtable->used;
|
||
h->vtable->size = h->vtable->parent->vtable->size;
|
||
}
|
||
else
|
||
{
|
||
size_t n;
|
||
bfd_boolean *cu, *pu;
|
||
|
||
/* Or the parent's entries into ours. */
|
||
cu = h->vtable->used;
|
||
cu[-1] = TRUE;
|
||
pu = h->vtable->parent->vtable->used;
|
||
if (pu != NULL)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
unsigned int log_file_align;
|
||
|
||
bed = get_elf_backend_data (h->root.u.def.section->owner);
|
||
log_file_align = bed->s->log_file_align;
|
||
n = h->vtable->parent->vtable->size >> log_file_align;
|
||
while (n--)
|
||
{
|
||
if (*pu)
|
||
*cu = TRUE;
|
||
pu++;
|
||
cu++;
|
||
}
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
|
||
{
|
||
asection *sec;
|
||
bfd_vma hstart, hend;
|
||
Elf_Internal_Rela *relstart, *relend, *rel;
|
||
const struct elf_backend_data *bed;
|
||
unsigned int log_file_align;
|
||
|
||
/* Take care of both those symbols that do not describe vtables as
|
||
well as those that are not loaded. */
|
||
if (h->vtable == NULL || h->vtable->parent == NULL)
|
||
return TRUE;
|
||
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak);
|
||
|
||
sec = h->root.u.def.section;
|
||
hstart = h->root.u.def.value;
|
||
hend = hstart + h->size;
|
||
|
||
relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
|
||
if (!relstart)
|
||
return *(bfd_boolean *) okp = FALSE;
|
||
bed = get_elf_backend_data (sec->owner);
|
||
log_file_align = bed->s->log_file_align;
|
||
|
||
relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
|
||
for (rel = relstart; rel < relend; ++rel)
|
||
if (rel->r_offset >= hstart && rel->r_offset < hend)
|
||
{
|
||
/* If the entry is in use, do nothing. */
|
||
if (h->vtable->used
|
||
&& (rel->r_offset - hstart) < h->vtable->size)
|
||
{
|
||
bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
|
||
if (h->vtable->used[entry])
|
||
continue;
|
||
}
|
||
/* Otherwise, kill it. */
|
||
rel->r_offset = rel->r_info = rel->r_addend = 0;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Mark sections containing dynamically referenced symbols. When
|
||
building shared libraries, we must assume that any visible symbol is
|
||
referenced. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
|
||
{
|
||
struct bfd_link_info *info = (struct bfd_link_info *) inf;
|
||
struct bfd_elf_dynamic_list *d = info->dynamic_list;
|
||
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& (h->ref_dynamic
|
||
|| ((h->def_regular || ELF_COMMON_DEF_P (h))
|
||
&& ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
|
||
&& ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
|
||
&& (!info->executable
|
||
|| info->export_dynamic
|
||
|| (h->dynamic
|
||
&& d != NULL
|
||
&& (*d->match) (&d->head, NULL, h->root.root.string)))
|
||
&& (strchr (h->root.root.string, ELF_VER_CHR) != NULL
|
||
|| !bfd_hide_sym_by_version (info->version_info,
|
||
h->root.root.string)))))
|
||
h->root.u.def.section->flags |= SEC_KEEP;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Keep all sections containing symbols undefined on the command-line,
|
||
and the section containing the entry symbol. */
|
||
|
||
void
|
||
_bfd_elf_gc_keep (struct bfd_link_info *info)
|
||
{
|
||
struct bfd_sym_chain *sym;
|
||
|
||
for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
|
||
FALSE, FALSE, FALSE);
|
||
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& !bfd_is_abs_section (h->root.u.def.section))
|
||
h->root.u.def.section->flags |= SEC_KEEP;
|
||
}
|
||
}
|
||
|
||
bfd_boolean
|
||
bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
|
||
struct bfd_link_info *info)
|
||
{
|
||
bfd *ibfd = info->input_bfds;
|
||
|
||
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
|
||
{
|
||
asection *sec;
|
||
struct elf_reloc_cookie cookie;
|
||
|
||
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
if (!init_reloc_cookie (&cookie, info, ibfd))
|
||
return FALSE;
|
||
|
||
for (sec = ibfd->sections; sec; sec = sec->next)
|
||
{
|
||
if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
|
||
&& init_reloc_cookie_rels (&cookie, info, ibfd, sec))
|
||
{
|
||
_bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
|
||
fini_reloc_cookie_rels (&cookie, sec);
|
||
}
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Do mark and sweep of unused sections. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd_boolean ok = TRUE;
|
||
bfd *sub;
|
||
elf_gc_mark_hook_fn gc_mark_hook;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct elf_link_hash_table *htab;
|
||
|
||
if (!bed->can_gc_sections
|
||
|| !is_elf_hash_table (info->hash))
|
||
{
|
||
(*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
|
||
return TRUE;
|
||
}
|
||
|
||
bed->gc_keep (info);
|
||
htab = elf_hash_table (info);
|
||
|
||
/* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
|
||
at the .eh_frame section if we can mark the FDEs individually. */
|
||
for (sub = info->input_bfds;
|
||
info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
|
||
sub = sub->link.next)
|
||
{
|
||
asection *sec;
|
||
struct elf_reloc_cookie cookie;
|
||
|
||
sec = bfd_get_section_by_name (sub, ".eh_frame");
|
||
while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
|
||
{
|
||
_bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
|
||
if (elf_section_data (sec)->sec_info
|
||
&& (sec->flags & SEC_LINKER_CREATED) == 0)
|
||
elf_eh_frame_section (sub) = sec;
|
||
fini_reloc_cookie_for_section (&cookie, sec);
|
||
sec = bfd_get_next_section_by_name (sec);
|
||
}
|
||
}
|
||
|
||
/* Apply transitive closure to the vtable entry usage info. */
|
||
elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
|
||
if (!ok)
|
||
return FALSE;
|
||
|
||
/* Kill the vtable relocations that were not used. */
|
||
elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
|
||
if (!ok)
|
||
return FALSE;
|
||
|
||
/* Mark dynamically referenced symbols. */
|
||
if (htab->dynamic_sections_created)
|
||
elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
|
||
|
||
/* Grovel through relocs to find out who stays ... */
|
||
gc_mark_hook = bed->gc_mark_hook;
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
|
||
{
|
||
asection *o;
|
||
|
||
if (bfd_get_flavour (sub) != bfd_target_elf_flavour
|
||
|| !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
|
||
continue;
|
||
|
||
/* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
|
||
Also treat note sections as a root, if the section is not part
|
||
of a group. */
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
if (!o->gc_mark
|
||
&& (o->flags & SEC_EXCLUDE) == 0
|
||
&& ((o->flags & SEC_KEEP) != 0
|
||
|| (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
|
||
&& elf_next_in_group (o) == NULL )))
|
||
{
|
||
if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* Allow the backend to mark additional target specific sections. */
|
||
bed->gc_mark_extra_sections (info, gc_mark_hook);
|
||
|
||
/* ... and mark SEC_EXCLUDE for those that go. */
|
||
return elf_gc_sweep (abfd, info);
|
||
}
|
||
|
||
/* Called from check_relocs to record the existence of a VTINHERIT reloc. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_gc_record_vtinherit (bfd *abfd,
|
||
asection *sec,
|
||
struct elf_link_hash_entry *h,
|
||
bfd_vma offset)
|
||
{
|
||
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
|
||
struct elf_link_hash_entry **search, *child;
|
||
bfd_size_type extsymcount;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols at
|
||
this point. */
|
||
extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
|
||
if (!elf_bad_symtab (abfd))
|
||
extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
|
||
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
sym_hashes_end = sym_hashes + extsymcount;
|
||
|
||
/* Hunt down the child symbol, which is in this section at the same
|
||
offset as the relocation. */
|
||
for (search = sym_hashes; search != sym_hashes_end; ++search)
|
||
{
|
||
if ((child = *search) != NULL
|
||
&& (child->root.type == bfd_link_hash_defined
|
||
|| child->root.type == bfd_link_hash_defweak)
|
||
&& child->root.u.def.section == sec
|
||
&& child->root.u.def.value == offset)
|
||
goto win;
|
||
}
|
||
|
||
(*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
|
||
abfd, sec, (unsigned long) offset);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
|
||
win:
|
||
if (!child->vtable)
|
||
{
|
||
child->vtable = ((struct elf_link_virtual_table_entry *)
|
||
bfd_zalloc (abfd, sizeof (*child->vtable)));
|
||
if (!child->vtable)
|
||
return FALSE;
|
||
}
|
||
if (!h)
|
||
{
|
||
/* This *should* only be the absolute section. It could potentially
|
||
be that someone has defined a non-global vtable though, which
|
||
would be bad. It isn't worth paging in the local symbols to be
|
||
sure though; that case should simply be handled by the assembler. */
|
||
|
||
child->vtable->parent = (struct elf_link_hash_entry *) -1;
|
||
}
|
||
else
|
||
child->vtable->parent = h;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Called from check_relocs to record the existence of a VTENTRY reloc. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *sec ATTRIBUTE_UNUSED,
|
||
struct elf_link_hash_entry *h,
|
||
bfd_vma addend)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
unsigned int log_file_align = bed->s->log_file_align;
|
||
|
||
if (!h->vtable)
|
||
{
|
||
h->vtable = ((struct elf_link_virtual_table_entry *)
|
||
bfd_zalloc (abfd, sizeof (*h->vtable)));
|
||
if (!h->vtable)
|
||
return FALSE;
|
||
}
|
||
|
||
if (addend >= h->vtable->size)
|
||
{
|
||
size_t size, bytes, file_align;
|
||
bfd_boolean *ptr = h->vtable->used;
|
||
|
||
/* While the symbol is undefined, we have to be prepared to handle
|
||
a zero size. */
|
||
file_align = 1 << log_file_align;
|
||
if (h->root.type == bfd_link_hash_undefined)
|
||
size = addend + file_align;
|
||
else
|
||
{
|
||
size = h->size;
|
||
if (addend >= size)
|
||
{
|
||
/* Oops! We've got a reference past the defined end of
|
||
the table. This is probably a bug -- shall we warn? */
|
||
size = addend + file_align;
|
||
}
|
||
}
|
||
size = (size + file_align - 1) & -file_align;
|
||
|
||
/* Allocate one extra entry for use as a "done" flag for the
|
||
consolidation pass. */
|
||
bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
|
||
|
||
if (ptr)
|
||
{
|
||
ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
|
||
|
||
if (ptr != NULL)
|
||
{
|
||
size_t oldbytes;
|
||
|
||
oldbytes = (((h->vtable->size >> log_file_align) + 1)
|
||
* sizeof (bfd_boolean));
|
||
memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
|
||
}
|
||
}
|
||
else
|
||
ptr = (bfd_boolean *) bfd_zmalloc (bytes);
|
||
|
||
if (ptr == NULL)
|
||
return FALSE;
|
||
|
||
/* And arrange for that done flag to be at index -1. */
|
||
h->vtable->used = ptr + 1;
|
||
h->vtable->size = size;
|
||
}
|
||
|
||
h->vtable->used[addend >> log_file_align] = TRUE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Map an ELF section header flag to its corresponding string. */
|
||
typedef struct
|
||
{
|
||
char *flag_name;
|
||
flagword flag_value;
|
||
} elf_flags_to_name_table;
|
||
|
||
static elf_flags_to_name_table elf_flags_to_names [] =
|
||
{
|
||
{ "SHF_WRITE", SHF_WRITE },
|
||
{ "SHF_ALLOC", SHF_ALLOC },
|
||
{ "SHF_EXECINSTR", SHF_EXECINSTR },
|
||
{ "SHF_MERGE", SHF_MERGE },
|
||
{ "SHF_STRINGS", SHF_STRINGS },
|
||
{ "SHF_INFO_LINK", SHF_INFO_LINK},
|
||
{ "SHF_LINK_ORDER", SHF_LINK_ORDER},
|
||
{ "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
|
||
{ "SHF_GROUP", SHF_GROUP },
|
||
{ "SHF_TLS", SHF_TLS },
|
||
{ "SHF_MASKOS", SHF_MASKOS },
|
||
{ "SHF_EXCLUDE", SHF_EXCLUDE },
|
||
};
|
||
|
||
/* Returns TRUE if the section is to be included, otherwise FALSE. */
|
||
bfd_boolean
|
||
bfd_elf_lookup_section_flags (struct bfd_link_info *info,
|
||
struct flag_info *flaginfo,
|
||
asection *section)
|
||
{
|
||
const bfd_vma sh_flags = elf_section_flags (section);
|
||
|
||
if (!flaginfo->flags_initialized)
|
||
{
|
||
bfd *obfd = info->output_bfd;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (obfd);
|
||
struct flag_info_list *tf = flaginfo->flag_list;
|
||
int with_hex = 0;
|
||
int without_hex = 0;
|
||
|
||
for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
|
||
{
|
||
unsigned i;
|
||
flagword (*lookup) (char *);
|
||
|
||
lookup = bed->elf_backend_lookup_section_flags_hook;
|
||
if (lookup != NULL)
|
||
{
|
||
flagword hexval = (*lookup) ((char *) tf->name);
|
||
|
||
if (hexval != 0)
|
||
{
|
||
if (tf->with == with_flags)
|
||
with_hex |= hexval;
|
||
else if (tf->with == without_flags)
|
||
without_hex |= hexval;
|
||
tf->valid = TRUE;
|
||
continue;
|
||
}
|
||
}
|
||
for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
|
||
{
|
||
if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
|
||
{
|
||
if (tf->with == with_flags)
|
||
with_hex |= elf_flags_to_names[i].flag_value;
|
||
else if (tf->with == without_flags)
|
||
without_hex |= elf_flags_to_names[i].flag_value;
|
||
tf->valid = TRUE;
|
||
break;
|
||
}
|
||
}
|
||
if (!tf->valid)
|
||
{
|
||
info->callbacks->einfo
|
||
(_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
|
||
return FALSE;
|
||
}
|
||
}
|
||
flaginfo->flags_initialized = TRUE;
|
||
flaginfo->only_with_flags |= with_hex;
|
||
flaginfo->not_with_flags |= without_hex;
|
||
}
|
||
|
||
if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
|
||
return FALSE;
|
||
|
||
if ((flaginfo->not_with_flags & sh_flags) != 0)
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
struct alloc_got_off_arg {
|
||
bfd_vma gotoff;
|
||
struct bfd_link_info *info;
|
||
};
|
||
|
||
/* We need a special top-level link routine to convert got reference counts
|
||
to real got offsets. */
|
||
|
||
static bfd_boolean
|
||
elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
|
||
{
|
||
struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
|
||
bfd *obfd = gofarg->info->output_bfd;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (obfd);
|
||
|
||
if (h->got.refcount > 0)
|
||
{
|
||
h->got.offset = gofarg->gotoff;
|
||
gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
|
||
}
|
||
else
|
||
h->got.offset = (bfd_vma) -1;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* And an accompanying bit to work out final got entry offsets once
|
||
we're done. Should be called from final_link. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
|
||
struct bfd_link_info *info)
|
||
{
|
||
bfd *i;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_vma gotoff;
|
||
struct alloc_got_off_arg gofarg;
|
||
|
||
BFD_ASSERT (abfd == info->output_bfd);
|
||
|
||
if (! is_elf_hash_table (info->hash))
|
||
return FALSE;
|
||
|
||
/* The GOT offset is relative to the .got section, but the GOT header is
|
||
put into the .got.plt section, if the backend uses it. */
|
||
if (bed->want_got_plt)
|
||
gotoff = 0;
|
||
else
|
||
gotoff = bed->got_header_size;
|
||
|
||
/* Do the local .got entries first. */
|
||
for (i = info->input_bfds; i; i = i->link.next)
|
||
{
|
||
bfd_signed_vma *local_got;
|
||
bfd_size_type j, locsymcount;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
|
||
if (bfd_get_flavour (i) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
local_got = elf_local_got_refcounts (i);
|
||
if (!local_got)
|
||
continue;
|
||
|
||
symtab_hdr = &elf_tdata (i)->symtab_hdr;
|
||
if (elf_bad_symtab (i))
|
||
locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
|
||
else
|
||
locsymcount = symtab_hdr->sh_info;
|
||
|
||
for (j = 0; j < locsymcount; ++j)
|
||
{
|
||
if (local_got[j] > 0)
|
||
{
|
||
local_got[j] = gotoff;
|
||
gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
|
||
}
|
||
else
|
||
local_got[j] = (bfd_vma) -1;
|
||
}
|
||
}
|
||
|
||
/* Then the global .got entries. .plt refcounts are handled by
|
||
adjust_dynamic_symbol */
|
||
gofarg.gotoff = gotoff;
|
||
gofarg.info = info;
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_allocate_got_offsets,
|
||
&gofarg);
|
||
return TRUE;
|
||
}
|
||
|
||
/* Many folk need no more in the way of final link than this, once
|
||
got entry reference counting is enabled. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
|
||
return FALSE;
|
||
|
||
/* Invoke the regular ELF backend linker to do all the work. */
|
||
return bfd_elf_final_link (abfd, info);
|
||
}
|
||
|
||
bfd_boolean
|
||
bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
|
||
{
|
||
struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
|
||
|
||
if (rcookie->bad_symtab)
|
||
rcookie->rel = rcookie->rels;
|
||
|
||
for (; rcookie->rel < rcookie->relend; rcookie->rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
|
||
if (! rcookie->bad_symtab)
|
||
if (rcookie->rel->r_offset > offset)
|
||
return FALSE;
|
||
if (rcookie->rel->r_offset != offset)
|
||
continue;
|
||
|
||
r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
|
||
if (r_symndx == STN_UNDEF)
|
||
return TRUE;
|
||
|
||
if (r_symndx >= rcookie->locsymcount
|
||
|| ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
|
||
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& (h->root.u.def.section->owner != rcookie->abfd
|
||
|| h->root.u.def.section->kept_section != NULL
|
||
|| discarded_section (h->root.u.def.section)))
|
||
return TRUE;
|
||
}
|
||
else
|
||
{
|
||
/* It's not a relocation against a global symbol,
|
||
but it could be a relocation against a local
|
||
symbol for a discarded section. */
|
||
asection *isec;
|
||
Elf_Internal_Sym *isym;
|
||
|
||
/* Need to: get the symbol; get the section. */
|
||
isym = &rcookie->locsyms[r_symndx];
|
||
isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
|
||
if (isec != NULL
|
||
&& (isec->kept_section != NULL
|
||
|| discarded_section (isec)))
|
||
return TRUE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
/* Discard unneeded references to discarded sections.
|
||
Returns -1 on error, 1 if any section's size was changed, 0 if
|
||
nothing changed. This function assumes that the relocations are in
|
||
sorted order, which is true for all known assemblers. */
|
||
|
||
int
|
||
bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf_reloc_cookie cookie;
|
||
asection *o;
|
||
bfd *abfd;
|
||
int changed = 0;
|
||
|
||
if (info->traditional_format
|
||
|| !is_elf_hash_table (info->hash))
|
||
return 0;
|
||
|
||
o = bfd_get_section_by_name (output_bfd, ".stab");
|
||
if (o != NULL)
|
||
{
|
||
asection *i;
|
||
|
||
for (i = o->map_head.s; i != NULL; i = i->map_head.s)
|
||
{
|
||
if (i->size == 0
|
||
|| i->reloc_count == 0
|
||
|| i->sec_info_type != SEC_INFO_TYPE_STABS)
|
||
continue;
|
||
|
||
abfd = i->owner;
|
||
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
if (!init_reloc_cookie_for_section (&cookie, info, i))
|
||
return -1;
|
||
|
||
if (_bfd_discard_section_stabs (abfd, i,
|
||
elf_section_data (i)->sec_info,
|
||
bfd_elf_reloc_symbol_deleted_p,
|
||
&cookie))
|
||
changed = 1;
|
||
|
||
fini_reloc_cookie_for_section (&cookie, i);
|
||
}
|
||
}
|
||
|
||
o = NULL;
|
||
if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
|
||
o = bfd_get_section_by_name (output_bfd, ".eh_frame");
|
||
if (o != NULL)
|
||
{
|
||
asection *i;
|
||
|
||
for (i = o->map_head.s; i != NULL; i = i->map_head.s)
|
||
{
|
||
if (i->size == 0)
|
||
continue;
|
||
|
||
abfd = i->owner;
|
||
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
if (!init_reloc_cookie_for_section (&cookie, info, i))
|
||
return -1;
|
||
|
||
_bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
|
||
if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
|
||
bfd_elf_reloc_symbol_deleted_p,
|
||
&cookie))
|
||
changed = 1;
|
||
|
||
fini_reloc_cookie_for_section (&cookie, i);
|
||
}
|
||
}
|
||
|
||
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
if (bed->elf_backend_discard_info != NULL)
|
||
{
|
||
if (!init_reloc_cookie (&cookie, info, abfd))
|
||
return -1;
|
||
|
||
if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
|
||
changed = 1;
|
||
|
||
fini_reloc_cookie (&cookie, abfd);
|
||
}
|
||
}
|
||
|
||
if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
|
||
_bfd_elf_end_eh_frame_parsing (info);
|
||
|
||
if (info->eh_frame_hdr_type
|
||
&& !info->relocatable
|
||
&& _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
|
||
changed = 1;
|
||
|
||
return changed;
|
||
}
|
||
|
||
bfd_boolean
|
||
_bfd_elf_section_already_linked (bfd *abfd,
|
||
asection *sec,
|
||
struct bfd_link_info *info)
|
||
{
|
||
flagword flags;
|
||
const char *name, *key;
|
||
struct bfd_section_already_linked *l;
|
||
struct bfd_section_already_linked_hash_entry *already_linked_list;
|
||
|
||
if (sec->output_section == bfd_abs_section_ptr)
|
||
return FALSE;
|
||
|
||
flags = sec->flags;
|
||
|
||
/* Return if it isn't a linkonce section. A comdat group section
|
||
also has SEC_LINK_ONCE set. */
|
||
if ((flags & SEC_LINK_ONCE) == 0)
|
||
return FALSE;
|
||
|
||
/* Don't put group member sections on our list of already linked
|
||
sections. They are handled as a group via their group section. */
|
||
if (elf_sec_group (sec) != NULL)
|
||
return FALSE;
|
||
|
||
/* For a SHT_GROUP section, use the group signature as the key. */
|
||
name = sec->name;
|
||
if ((flags & SEC_GROUP) != 0
|
||
&& elf_next_in_group (sec) != NULL
|
||
&& elf_group_name (elf_next_in_group (sec)) != NULL)
|
||
key = elf_group_name (elf_next_in_group (sec));
|
||
else
|
||
{
|
||
/* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
|
||
if (CONST_STRNEQ (name, ".gnu.linkonce.")
|
||
&& (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
|
||
key++;
|
||
else
|
||
/* Must be a user linkonce section that doesn't follow gcc's
|
||
naming convention. In this case we won't be matching
|
||
single member groups. */
|
||
key = name;
|
||
}
|
||
|
||
already_linked_list = bfd_section_already_linked_table_lookup (key);
|
||
|
||
for (l = already_linked_list->entry; l != NULL; l = l->next)
|
||
{
|
||
/* We may have 2 different types of sections on the list: group
|
||
sections with a signature of <key> (<key> is some string),
|
||
and linkonce sections named .gnu.linkonce.<type>.<key>.
|
||
Match like sections. LTO plugin sections are an exception.
|
||
They are always named .gnu.linkonce.t.<key> and match either
|
||
type of section. */
|
||
if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
|
||
&& ((flags & SEC_GROUP) != 0
|
||
|| strcmp (name, l->sec->name) == 0))
|
||
|| (l->sec->owner->flags & BFD_PLUGIN) != 0)
|
||
{
|
||
/* The section has already been linked. See if we should
|
||
issue a warning. */
|
||
if (!_bfd_handle_already_linked (sec, l, info))
|
||
return FALSE;
|
||
|
||
if (flags & SEC_GROUP)
|
||
{
|
||
asection *first = elf_next_in_group (sec);
|
||
asection *s = first;
|
||
|
||
while (s != NULL)
|
||
{
|
||
s->output_section = bfd_abs_section_ptr;
|
||
/* Record which group discards it. */
|
||
s->kept_section = l->sec;
|
||
s = elf_next_in_group (s);
|
||
/* These lists are circular. */
|
||
if (s == first)
|
||
break;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
/* A single member comdat group section may be discarded by a
|
||
linkonce section and vice versa. */
|
||
if ((flags & SEC_GROUP) != 0)
|
||
{
|
||
asection *first = elf_next_in_group (sec);
|
||
|
||
if (first != NULL && elf_next_in_group (first) == first)
|
||
/* Check this single member group against linkonce sections. */
|
||
for (l = already_linked_list->entry; l != NULL; l = l->next)
|
||
if ((l->sec->flags & SEC_GROUP) == 0
|
||
&& bfd_elf_match_symbols_in_sections (l->sec, first, info))
|
||
{
|
||
first->output_section = bfd_abs_section_ptr;
|
||
first->kept_section = l->sec;
|
||
sec->output_section = bfd_abs_section_ptr;
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
/* Check this linkonce section against single member groups. */
|
||
for (l = already_linked_list->entry; l != NULL; l = l->next)
|
||
if (l->sec->flags & SEC_GROUP)
|
||
{
|
||
asection *first = elf_next_in_group (l->sec);
|
||
|
||
if (first != NULL
|
||
&& elf_next_in_group (first) == first
|
||
&& bfd_elf_match_symbols_in_sections (first, sec, info))
|
||
{
|
||
sec->output_section = bfd_abs_section_ptr;
|
||
sec->kept_section = first;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
|
||
referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
|
||
specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
|
||
prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
|
||
matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
|
||
but its `.gnu.linkonce.t.F' is discarded means we chose one-only
|
||
`.gnu.linkonce.t.F' section from a different bfd not requiring any
|
||
`.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
|
||
The reverse order cannot happen as there is never a bfd with only the
|
||
`.gnu.linkonce.r.F' section. The order of sections in a bfd does not
|
||
matter as here were are looking only for cross-bfd sections. */
|
||
|
||
if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
|
||
for (l = already_linked_list->entry; l != NULL; l = l->next)
|
||
if ((l->sec->flags & SEC_GROUP) == 0
|
||
&& CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
|
||
{
|
||
if (abfd != l->sec->owner)
|
||
sec->output_section = bfd_abs_section_ptr;
|
||
break;
|
||
}
|
||
|
||
/* This is the first section with this name. Record it. */
|
||
if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
|
||
info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
|
||
return sec->output_section == bfd_abs_section_ptr;
|
||
}
|
||
|
||
bfd_boolean
|
||
_bfd_elf_common_definition (Elf_Internal_Sym *sym)
|
||
{
|
||
return sym->st_shndx == SHN_COMMON;
|
||
}
|
||
|
||
unsigned int
|
||
_bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
|
||
{
|
||
return SHN_COMMON;
|
||
}
|
||
|
||
asection *
|
||
_bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
|
||
{
|
||
return bfd_com_section_ptr;
|
||
}
|
||
|
||
bfd_vma
|
||
_bfd_elf_default_got_elt_size (bfd *abfd,
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED,
|
||
struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
|
||
bfd *ibfd ATTRIBUTE_UNUSED,
|
||
unsigned long symndx ATTRIBUTE_UNUSED)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
return bed->s->arch_size / 8;
|
||
}
|
||
|
||
/* Routines to support the creation of dynamic relocs. */
|
||
|
||
/* Returns the name of the dynamic reloc section associated with SEC. */
|
||
|
||
static const char *
|
||
get_dynamic_reloc_section_name (bfd * abfd,
|
||
asection * sec,
|
||
bfd_boolean is_rela)
|
||
{
|
||
char *name;
|
||
const char *old_name = bfd_get_section_name (NULL, sec);
|
||
const char *prefix = is_rela ? ".rela" : ".rel";
|
||
|
||
if (old_name == NULL)
|
||
return NULL;
|
||
|
||
name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
|
||
sprintf (name, "%s%s", prefix, old_name);
|
||
|
||
return name;
|
||
}
|
||
|
||
/* Returns the dynamic reloc section associated with SEC.
|
||
If necessary compute the name of the dynamic reloc section based
|
||
on SEC's name (looked up in ABFD's string table) and the setting
|
||
of IS_RELA. */
|
||
|
||
asection *
|
||
_bfd_elf_get_dynamic_reloc_section (bfd * abfd,
|
||
asection * sec,
|
||
bfd_boolean is_rela)
|
||
{
|
||
asection * reloc_sec = elf_section_data (sec)->sreloc;
|
||
|
||
if (reloc_sec == NULL)
|
||
{
|
||
const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
|
||
|
||
if (name != NULL)
|
||
{
|
||
reloc_sec = bfd_get_linker_section (abfd, name);
|
||
|
||
if (reloc_sec != NULL)
|
||
elf_section_data (sec)->sreloc = reloc_sec;
|
||
}
|
||
}
|
||
|
||
return reloc_sec;
|
||
}
|
||
|
||
/* Returns the dynamic reloc section associated with SEC. If the
|
||
section does not exist it is created and attached to the DYNOBJ
|
||
bfd and stored in the SRELOC field of SEC's elf_section_data
|
||
structure.
|
||
|
||
ALIGNMENT is the alignment for the newly created section and
|
||
IS_RELA defines whether the name should be .rela.<SEC's name>
|
||
or .rel.<SEC's name>. The section name is looked up in the
|
||
string table associated with ABFD. */
|
||
|
||
asection *
|
||
_bfd_elf_make_dynamic_reloc_section (asection *sec,
|
||
bfd *dynobj,
|
||
unsigned int alignment,
|
||
bfd *abfd,
|
||
bfd_boolean is_rela)
|
||
{
|
||
asection * reloc_sec = elf_section_data (sec)->sreloc;
|
||
|
||
if (reloc_sec == NULL)
|
||
{
|
||
const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
|
||
|
||
if (name == NULL)
|
||
return NULL;
|
||
|
||
reloc_sec = bfd_get_linker_section (dynobj, name);
|
||
|
||
if (reloc_sec == NULL)
|
||
{
|
||
flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
|
||
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
|
||
if ((sec->flags & SEC_ALLOC) != 0)
|
||
flags |= SEC_ALLOC | SEC_LOAD;
|
||
|
||
reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
|
||
if (reloc_sec != NULL)
|
||
{
|
||
/* _bfd_elf_get_sec_type_attr chooses a section type by
|
||
name. Override as it may be wrong, eg. for a user
|
||
section named "auto" we'll get ".relauto" which is
|
||
seen to be a .rela section. */
|
||
elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
|
||
if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
|
||
reloc_sec = NULL;
|
||
}
|
||
}
|
||
|
||
elf_section_data (sec)->sreloc = reloc_sec;
|
||
}
|
||
|
||
return reloc_sec;
|
||
}
|
||
|
||
/* Copy the ELF symbol type and other attributes for a linker script
|
||
assignment from HSRC to HDEST. Generally this should be treated as
|
||
if we found a strong non-dynamic definition for HDEST (except that
|
||
ld ignores multiple definition errors). */
|
||
void
|
||
_bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
|
||
struct bfd_link_hash_entry *hdest,
|
||
struct bfd_link_hash_entry *hsrc)
|
||
{
|
||
struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
|
||
struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
|
||
Elf_Internal_Sym isym;
|
||
|
||
ehdest->type = ehsrc->type;
|
||
ehdest->target_internal = ehsrc->target_internal;
|
||
|
||
isym.st_other = ehsrc->other;
|
||
elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
|
||
}
|
||
|
||
/* Append a RELA relocation REL to section S in BFD. */
|
||
|
||
void
|
||
elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
|
||
BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
|
||
bed->s->swap_reloca_out (abfd, rel, loc);
|
||
}
|
||
|
||
/* Append a REL relocation REL to section S in BFD. */
|
||
|
||
void
|
||
elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
|
||
BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
|
||
bed->s->swap_reloc_out (abfd, rel, loc);
|
||
}
|