9852 lines
284 KiB
C
9852 lines
284 KiB
C
/* ELF linking support for BFD.
|
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Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006 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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|
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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 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
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
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
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
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "bfd.h"
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#include "sysdep.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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/* 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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if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
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sec, 0, NULL, FALSE,
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get_elf_backend_data (abfd)->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->type = STT_OBJECT;
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h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
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bed = get_elf_backend_data (abfd);
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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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int ptralign;
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/* This function may be called more than once. */
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s = bfd_get_section_by_name (abfd, ".got");
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if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
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return TRUE;
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switch (bed->s->arch_size)
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{
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case 32:
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ptralign = 2;
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break;
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case 64:
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ptralign = 3;
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break;
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default:
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bfd_set_error (bfd_error_bad_value);
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return FALSE;
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}
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flags = bed->dynamic_sec_flags;
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s = bfd_make_section_with_flags (abfd, ".got", flags);
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if (s == NULL
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|| !bfd_set_section_alignment (abfd, s, ptralign))
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return FALSE;
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if (bed->want_got_plt)
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{
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s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
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if (s == NULL
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|| !bfd_set_section_alignment (abfd, s, ptralign))
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||
return FALSE;
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||
}
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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, "_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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/* 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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||
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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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register asection *s;
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const struct elf_backend_data *bed;
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||
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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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||
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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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||
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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_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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if (! info->traditional_format)
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||
{
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s = bfd_make_section_with_flags (abfd, ".eh_frame_hdr",
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flags | SEC_READONLY);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, 2))
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return FALSE;
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elf_hash_table (info)->eh_info.hdr_sec = s;
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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_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_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_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_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_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_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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/* 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
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only want to define it if we are, in fact, creating a .dynamic
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section. We don't want to define it if there is no .dynamic
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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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if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
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return FALSE;
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s = bfd_make_section_with_flags (abfd, ".hash",
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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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elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
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/* Let the backend create the rest of the sections. This lets the
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backend set the right flags. The backend will normally create
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the .got and .plt sections. */
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if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
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return FALSE;
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elf_hash_table (info)->dynamic_sections_created = TRUE;
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return TRUE;
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}
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/* Create dynamic sections when linking against a dynamic object. */
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bfd_boolean
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_bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
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{
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flagword flags, pltflags;
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struct elf_link_hash_entry *h;
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asection *s;
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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/* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
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.rel[a].bss sections. */
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flags = bed->dynamic_sec_flags;
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pltflags = flags;
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if (bed->plt_not_loaded)
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/* We do not clear SEC_ALLOC here because we still want the OS to
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allocate space for the section; it's just that there's nothing
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to read in from the object file. */
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pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
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else
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pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
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if (bed->plt_readonly)
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pltflags |= SEC_READONLY;
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s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
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return FALSE;
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/* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
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.plt section. */
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if (bed->want_plt_sym)
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{
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h = _bfd_elf_define_linkage_sym (abfd, info, s,
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"_PROCEDURE_LINKAGE_TABLE_");
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elf_hash_table (info)->hplt = h;
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if (h == NULL)
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return FALSE;
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}
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s = bfd_make_section_with_flags (abfd,
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(bed->default_use_rela_p
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? ".rela.plt" : ".rel.plt"),
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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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||
|
||
if (! _bfd_elf_create_got_section (abfd, info))
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||
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
|
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initialize them at run time. The linker script puts the .dynbss
|
||
section into the .bss section of the final image. */
|
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s = bfd_make_section_with_flags (abfd, ".dynbss",
|
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(SEC_ALLOC
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| SEC_LINKER_CREATED));
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||
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
|
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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_with_flags (abfd,
|
||
(bed->default_use_rela_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;
|
||
}
|
||
|
||
/* 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;
|
||
struct elf_link_hash_table *htab;
|
||
|
||
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;
|
||
|
||
/* 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. */
|
||
if (h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_undefined)
|
||
{
|
||
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);
|
||
}
|
||
|
||
if (h->root.type == bfd_link_hash_new)
|
||
h->non_elf = 0;
|
||
|
||
/* 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 (provide && hidden)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
|
||
|
||
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 = 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
|
||
|| entry->isym.st_shndx > SHN_HIRESERVE))
|
||
{
|
||
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 = data;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
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 = data;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
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)
|
||
{
|
||
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:
|
||
if (strcmp (p->name, ".got") == 0
|
||
|| strcmp (p->name, ".got.plt") == 0
|
||
|| strcmp (p->name, ".plt") == 0)
|
||
{
|
||
asection *ip;
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
if (dynobj != NULL
|
||
&& (ip = bfd_get_section_by_name (dynobj, p->name)) != NULL
|
||
&& (ip->flags & SEC_LINKER_CREATED)
|
||
&& ip->output_section == p)
|
||
return TRUE;
|
||
}
|
||
return FALSE;
|
||
|
||
/* 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;
|
||
}
|
||
*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;
|
||
}
|
||
|
||
/* This function is called when we want to define a new 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
|
||
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. We set POLD_ALIGNMENT if an old common symbol in a dynamic
|
||
object is overridden by a regular object. */
|
||
|
||
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,
|
||
unsigned int *pold_alignment,
|
||
struct elf_link_hash_entry **sym_hash,
|
||
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 *flip;
|
||
int bind;
|
||
bfd *oldbfd;
|
||
bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
|
||
bfd_boolean newweak, oldweak;
|
||
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;
|
||
|
||
/* This code is for coping with dynamic objects, and is only useful
|
||
if we are doing an ELF link. */
|
||
if (info->hash->creator != abfd->xvec)
|
||
return TRUE;
|
||
|
||
/* For merging, we only care about real symbols. */
|
||
|
||
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 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;
|
||
}
|
||
|
||
/* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
|
||
existing symbol. */
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
oldbfd = NULL;
|
||
oldsec = NULL;
|
||
break;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
oldbfd = h->root.u.undef.abfd;
|
||
oldsec = NULL;
|
||
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;
|
||
break;
|
||
}
|
||
|
||
/* 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
|
||
&& ((abfd->flags & DYNAMIC) == 0
|
||
|| !h->def_regular))
|
||
return TRUE;
|
||
|
||
/* NEWDYN and OLDDYN indicate whether the new or old symbol,
|
||
respectively, is from a dynamic object. */
|
||
|
||
newdyn = (abfd->flags & DYNAMIC) != 0;
|
||
|
||
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);
|
||
|
||
/* Check TLS symbol. We don't check undefined symbol introduced by
|
||
"ld -u". */
|
||
if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS)
|
||
&& ELF_ST_TYPE (sym->st_info) != h->type
|
||
&& oldbfd != NULL)
|
||
{
|
||
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;
|
||
}
|
||
|
||
/* We need to remember if a symbol has a definition in a dynamic
|
||
object or is weak in all dynamic objects. Internal and hidden
|
||
visibility will make it unavailable to dynamic objects. */
|
||
if (newdyn && !h->dynamic_def)
|
||
{
|
||
if (!bfd_is_und_section (sec))
|
||
h->dynamic_def = 1;
|
||
else
|
||
{
|
||
/* Check if this symbol is weak in all dynamic objects. If it
|
||
is the first time we see it in a dynamic object, we mark
|
||
if it is weak. Otherwise, we clear it. */
|
||
if (!h->ref_dynamic)
|
||
{
|
||
if (bind == STB_WEAK)
|
||
h->dynamic_weak = 1;
|
||
}
|
||
else if (bind != STB_WEAK)
|
||
h->dynamic_weak = 0;
|
||
}
|
||
}
|
||
|
||
/* 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;
|
||
/* 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 ((*sym_hash)->root.type == bfd_link_hash_indirect)
|
||
h = *sym_hash;
|
||
|
||
if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
|
||
&& bfd_is_und_section (sec))
|
||
{
|
||
/* If the new symbol is undefined and the old symbol was
|
||
also undefined before, we need to make sure
|
||
_bfd_generic_link_add_one_symbol doesn't mess
|
||
up the linker hash table undefs list. Since the old
|
||
definition came from a dynamic object, it is still on the
|
||
undefs list. */
|
||
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 (h->def_dynamic)
|
||
{
|
||
h->def_dynamic = 0;
|
||
h->ref_dynamic = 1;
|
||
h->dynamic_def = 1;
|
||
}
|
||
/* FIXME: Should we check type and size for protected symbol? */
|
||
h->size = 0;
|
||
h->type = 0;
|
||
return TRUE;
|
||
}
|
||
|
||
/* 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 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;
|
||
|
||
/* 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
|
||
&& ELF_ST_TYPE (sym->st_info) != STT_FUNC)
|
||
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
|
||
&& h->type != STT_FUNC)
|
||
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. */
|
||
bed = get_elf_backend_data (abfd);
|
||
if (bed->merge_symbol
|
||
&& !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
|
||
pold_alignment, skip, override,
|
||
type_change_ok, size_change_ok,
|
||
&newdyn, &newdef, &newdyncommon, &newweak,
|
||
abfd, &sec,
|
||
&olddyn, &olddef, &olddyncommon, &oldweak,
|
||
oldbfd, &oldsec))
|
||
return FALSE;
|
||
|
||
/* 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.root.string, oldbfd, bfd_link_hash_common,
|
||
h->size, 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
|
||
|| ELF_ST_TYPE (sym->st_info) == STT_FUNC))))
|
||
{
|
||
*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)
|
||
*skip = TRUE;
|
||
|
||
/* 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
|
||
|| h->type == STT_FUNC)))
|
||
&& 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))
|
||
*type_change_ok = TRUE;
|
||
|
||
if ((*sym_hash)->root.type == bfd_link_hash_indirect)
|
||
flip = *sym_hash;
|
||
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.root.string, oldbfd, bfd_link_hash_common,
|
||
h->size, 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 ((*sym_hash)->root.type == bfd_link_hash_indirect)
|
||
flip = *sym_hash;
|
||
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. */
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
flip->root.type = h->root.type;
|
||
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);
|
||
flip->root.u.undef.abfd = h->root.u.undef.abfd;
|
||
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, PSEC, VALUE, and OVERRIDE. We
|
||
set DYNSYM if the new indirect symbol is dynamic. */
|
||
|
||
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 **psec,
|
||
bfd_vma *value,
|
||
bfd_boolean *dynsym,
|
||
bfd_boolean override)
|
||
{
|
||
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;
|
||
char *p;
|
||
size_t len, shortlen;
|
||
asection *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;
|
||
|
||
if (override)
|
||
{
|
||
/* We are overridden by an old definition. We need to check if we
|
||
need to create the indirect symbol from the default name. */
|
||
hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
|
||
FALSE, FALSE);
|
||
BFD_ASSERT (hi != NULL);
|
||
if (hi == h)
|
||
return TRUE;
|
||
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;
|
||
if (hi == h)
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
collect = bed->collect;
|
||
dynamic = (abfd->flags & DYNAMIC) != 0;
|
||
|
||
shortlen = p - name;
|
||
shortname = 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;
|
||
sec = *psec;
|
||
if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
|
||
NULL, &hi, &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;
|
||
}
|
||
|
||
/* 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);
|
||
|
||
/* See if the new flags lead us to realize that the symbol must
|
||
be dynamic. */
|
||
if (! *dynsym)
|
||
{
|
||
if (! dynamic)
|
||
{
|
||
if (info->shared
|
||
|| 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 = 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;
|
||
sec = *psec;
|
||
if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
|
||
NULL, &hi, &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);
|
||
|
||
/* See if the new flags lead us to realize that the symbol
|
||
must be dynamic. */
|
||
if (! *dynsym)
|
||
{
|
||
if (! dynamic)
|
||
{
|
||
if (info->shared
|
||
|| 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. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_info_failed *eif = data;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->root.type == bfd_link_hash_indirect)
|
||
return TRUE;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (h->dynindx == -1
|
||
&& (h->def_regular
|
||
|| h->ref_regular))
|
||
{
|
||
struct bfd_elf_version_tree *t;
|
||
struct bfd_elf_version_expr *d;
|
||
|
||
for (t = eif->verdefs; t != NULL; t = t->next)
|
||
{
|
||
if (t->globals.list != NULL)
|
||
{
|
||
d = (*t->match) (&t->globals, NULL, h->root.root.string);
|
||
if (d != NULL)
|
||
goto doit;
|
||
}
|
||
|
||
if (t->locals.list != NULL)
|
||
{
|
||
d = (*t->match) (&t->locals, NULL, h->root.root.string);
|
||
if (d != NULL)
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
if (!eif->verdefs)
|
||
{
|
||
doit:
|
||
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. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
|
||
void *data)
|
||
{
|
||
struct elf_find_verdep_info *rinfo = data;
|
||
Elf_Internal_Verneed *t;
|
||
Elf_Internal_Vernaux *a;
|
||
bfd_size_type amt;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* 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)
|
||
return TRUE;
|
||
|
||
/* See if we already know about this version. */
|
||
for (t = elf_tdata (rinfo->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 = bfd_zalloc (rinfo->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->output_bfd)->verref;
|
||
elf_tdata (rinfo->output_bfd)->verref = t;
|
||
}
|
||
|
||
amt = sizeof *a;
|
||
a = bfd_zalloc (rinfo->output_bfd, amt);
|
||
|
||
/* 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. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_assign_sym_version_info *sinfo;
|
||
struct bfd_link_info *info;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_info_failed eif;
|
||
char *p;
|
||
bfd_size_type amt;
|
||
|
||
sinfo = data;
|
||
info = sinfo->info;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* 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 (sinfo->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->verdefs; 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 = bfd_malloc (len);
|
||
if (alc == NULL)
|
||
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 = bfd_zalloc (sinfo->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->verdefs != NULL && sinfo->verdefs->vernum == 0)
|
||
version_index = 0;
|
||
for (pp = &sinfo->verdefs; *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: undefined versioned symbol name %s"),
|
||
sinfo->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->verdefs != NULL)
|
||
{
|
||
struct bfd_elf_version_tree *t;
|
||
struct bfd_elf_version_tree *local_ver;
|
||
struct bfd_elf_version_expr *d;
|
||
|
||
/* See if can find what version this symbol is in. If the
|
||
symbol is supposed to be local, then don't actually register
|
||
it. */
|
||
local_ver = NULL;
|
||
for (t = sinfo->verdefs; t != NULL; t = t->next)
|
||
{
|
||
if (t->globals.list != NULL)
|
||
{
|
||
bfd_boolean matched;
|
||
|
||
matched = FALSE;
|
||
d = NULL;
|
||
while ((d = (*t->match) (&t->globals, d,
|
||
h->root.root.string)) != NULL)
|
||
if (d->symver)
|
||
matched = TRUE;
|
||
else
|
||
{
|
||
/* There is a version without definition. Make
|
||
the symbol the default definition for this
|
||
version. */
|
||
h->verinfo.vertree = t;
|
||
local_ver = NULL;
|
||
d->script = 1;
|
||
break;
|
||
}
|
||
if (d != NULL)
|
||
break;
|
||
else if (matched)
|
||
/* There is no undefined version for this symbol. Hide the
|
||
default one. */
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
}
|
||
|
||
if (t->locals.list != NULL)
|
||
{
|
||
d = NULL;
|
||
while ((d = (*t->match) (&t->locals, d,
|
||
h->root.root.string)) != NULL)
|
||
{
|
||
local_ver = t;
|
||
/* If the match is "*", keep looking for a more
|
||
explicit, perhaps even global, match.
|
||
XXX: Shouldn't this be !d->wildcard instead? */
|
||
if (d->pattern[0] != '*' || d->pattern[1] != '\0')
|
||
break;
|
||
}
|
||
|
||
if (d != NULL)
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (local_ver != NULL)
|
||
{
|
||
h->verinfo.vertree = local_ver;
|
||
if (h->dynindx != -1
|
||
&& ! info->export_dynamic)
|
||
{
|
||
(*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 = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
|
||
|
||
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 = 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 ((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;
|
||
}
|
||
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
|
||
REL_HDR2 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)
|
||
{
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
void *alloc1 = NULL;
|
||
Elf_Internal_Rela *alloc2 = NULL;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
|
||
if (elf_section_data (o)->relocs != NULL)
|
||
return elf_section_data (o)->relocs;
|
||
|
||
if (o->reloc_count == 0)
|
||
return NULL;
|
||
|
||
rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
|
||
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 = bfd_alloc (abfd, size);
|
||
else
|
||
internal_relocs = alloc2 = bfd_malloc (size);
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (external_relocs == NULL)
|
||
{
|
||
bfd_size_type size = rel_hdr->sh_size;
|
||
|
||
if (elf_section_data (o)->rel_hdr2)
|
||
size += elf_section_data (o)->rel_hdr2->sh_size;
|
||
alloc1 = bfd_malloc (size);
|
||
if (alloc1 == NULL)
|
||
goto error_return;
|
||
external_relocs = alloc1;
|
||
}
|
||
|
||
if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr,
|
||
external_relocs,
|
||
internal_relocs))
|
||
goto error_return;
|
||
if (elf_section_data (o)->rel_hdr2
|
||
&& (!elf_link_read_relocs_from_section
|
||
(abfd, o,
|
||
elf_section_data (o)->rel_hdr2,
|
||
((bfd_byte *) external_relocs) + rel_hdr->sh_size,
|
||
internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
|
||
* bed->s->int_rels_per_ext_rel))))
|
||
goto error_return;
|
||
|
||
/* Cache the results for next time, if we can. */
|
||
if (keep_memory)
|
||
elf_section_data (o)->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)
|
||
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. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_link_size_reloc_section (bfd *abfd,
|
||
Elf_Internal_Shdr *rel_hdr,
|
||
asection *o)
|
||
{
|
||
bfd_size_type reloc_count;
|
||
bfd_size_type num_rel_hashes;
|
||
|
||
/* Figure out how many relocations there will be. */
|
||
if (rel_hdr == &elf_section_data (o)->rel_hdr)
|
||
reloc_count = elf_section_data (o)->rel_count;
|
||
else
|
||
reloc_count = elf_section_data (o)->rel_count2;
|
||
|
||
num_rel_hashes = o->reloc_count;
|
||
if (num_rel_hashes < reloc_count)
|
||
num_rel_hashes = reloc_count;
|
||
|
||
/* That allows us to calculate the size of the section. */
|
||
rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_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 = bfd_zalloc (abfd, rel_hdr->sh_size);
|
||
if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
|
||
return FALSE;
|
||
|
||
/* We only allocate one set of hash entries, so we only do it the
|
||
first time we are called. */
|
||
if (elf_section_data (o)->rel_hashes == NULL
|
||
&& num_rel_hashes)
|
||
{
|
||
struct elf_link_hash_entry **p;
|
||
|
||
p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *));
|
||
if (p == NULL)
|
||
return FALSE;
|
||
|
||
elf_section_data (o)->rel_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;
|
||
Elf_Internal_Shdr *output_rel_hdr;
|
||
asection *output_section;
|
||
unsigned int *rel_countp = NULL;
|
||
const struct elf_backend_data *bed;
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
|
||
output_section = input_section->output_section;
|
||
output_rel_hdr = NULL;
|
||
|
||
if (elf_section_data (output_section)->rel_hdr.sh_entsize
|
||
== input_rel_hdr->sh_entsize)
|
||
{
|
||
output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
|
||
rel_countp = &elf_section_data (output_section)->rel_count;
|
||
}
|
||
else if (elf_section_data (output_section)->rel_hdr2
|
||
&& (elf_section_data (output_section)->rel_hdr2->sh_entsize
|
||
== input_rel_hdr->sh_entsize))
|
||
{
|
||
output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
|
||
rel_countp = &elf_section_data (output_section)->rel_count2;
|
||
}
|
||
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_object_format);
|
||
return FALSE;
|
||
}
|
||
|
||
bed = get_elf_backend_data (output_bfd);
|
||
if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel)
|
||
swap_out = bed->s->swap_reloc_out;
|
||
else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela)
|
||
swap_out = bed->s->swap_reloca_out;
|
||
else
|
||
abort ();
|
||
|
||
erel = output_rel_hdr->contents;
|
||
erel += *rel_countp * 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. */
|
||
*rel_countp += 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. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
|
||
struct elf_info_failed *eif)
|
||
{
|
||
const struct elf_backend_data *bed = NULL;
|
||
|
||
/* 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. */
|
||
if (elf_hash_table (eif->info)->dynobj)
|
||
{
|
||
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) == 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)
|
||
&& (eif->info->symbolic
|
||
|| 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)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
|
||
(*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)
|
||
{
|
||
struct elf_link_hash_entry *weakdef;
|
||
|
||
weakdef = h->u.weakdef;
|
||
if (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->root.type == bfd_link_hash_defined
|
||
|| weakdef->root.type == bfd_link_hash_defweak);
|
||
BFD_ASSERT (weakdef->def_dynamic);
|
||
|
||
/* 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 (weakdef->def_regular)
|
||
h->u.weakdef = NULL;
|
||
else
|
||
(*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. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_info_failed *eif = data;
|
||
bfd *dynobj;
|
||
const struct elf_backend_data *bed;
|
||
|
||
if (! is_elf_hash_table (eif->info->hash))
|
||
return FALSE;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
{
|
||
h->got = elf_hash_table (eif->info)->init_got_offset;
|
||
h->plt = elf_hash_table (eif->info)->init_plt_offset;
|
||
|
||
/* When warning symbols are created, they **replace** the "real"
|
||
entry in the hash table, thus we never get to see the real
|
||
symbol in a hash traversal. So look at it now. */
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
}
|
||
|
||
/* 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->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, we know there is an implicit
|
||
reference by a regular object file via the weak symbol H.
|
||
FIXME: Is this really true? What if the traversal finds
|
||
H->U.WEAKDEF before it finds H? */
|
||
h->u.weakdef->ref_regular = 1;
|
||
|
||
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 all external symbols pointing into SEC_MERGE sections
|
||
to reflect the object merging within the sections. */
|
||
|
||
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_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)
|
||
&& ((sec = h->root.u.def.section)->flags & SEC_MERGE)
|
||
&& sec->sec_info_type == ELF_INFO_TYPE_MERGE)
|
||
{
|
||
bfd *output_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 ignore_protected)
|
||
{
|
||
bfd_boolean binding_stays_local_p;
|
||
|
||
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 || info->symbolic;
|
||
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_INTERNAL:
|
||
case STV_HIDDEN:
|
||
return FALSE;
|
||
|
||
case STV_PROTECTED:
|
||
/* 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 (!ignore_protected || h->type != STT_FUNC)
|
||
binding_stays_local_p = TRUE;
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* If it isn't defined locally, then clearly it's dynamic. */
|
||
if (!h->def_regular)
|
||
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 and weak symbols. */
|
||
|
||
bfd_boolean
|
||
_bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
|
||
struct bfd_link_info *info,
|
||
bfd_boolean local_protected)
|
||
{
|
||
/* If it's a local sym, of course we resolve locally. */
|
||
if (h == NULL)
|
||
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 || info->symbolic)
|
||
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;
|
||
|
||
/* However, STV_HIDDEN or STV_INTERNAL ones must be local. */
|
||
if (ELF_ST_VISIBILITY (h->other) != STV_PROTECTED)
|
||
return TRUE;
|
||
|
||
/* STV_PROTECTED non-function symbols are local. */
|
||
if (h->type != STT_FUNC)
|
||
return TRUE;
|
||
|
||
/* Function pointer equality tests may require that STV_PROTECTED
|
||
symbols be treated as dynamic symbols, even when we know that the
|
||
dynamic linker will resolve them locally. */
|
||
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;
|
||
|
||
/* Function symbols do not count. */
|
||
if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
|
||
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. */
|
||
bed = get_elf_backend_data (abfd);
|
||
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;
|
||
|
||
if (! bfd_check_format (abfd, bfd_object))
|
||
return FALSE;
|
||
|
||
/* If we have already included the element containing this symbol in the
|
||
link then we do not need to include it again. Just claim that any symbol
|
||
it contains is not a definition, so that our caller will not decide to
|
||
(re)include this element. */
|
||
if (abfd->archive_pass)
|
||
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;
|
||
|
||
if (info->warn_shared_textrel && info->shared && tag == DT_TEXTREL)
|
||
_bfd_error_handler
|
||
(_("warning: creating a DT_TEXTREL in a shared object."));
|
||
|
||
bed = get_elf_backend_data (hash_table->dynobj);
|
||
s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
newsize = s->size + bed->s->sizeof_dyn;
|
||
newcontents = 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 oldsize;
|
||
bfd_size_type strindex;
|
||
|
||
if (!_bfd_elf_link_create_dynstrtab (abfd, info))
|
||
return -1;
|
||
|
||
hash_table = elf_hash_table (info);
|
||
oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
|
||
strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
|
||
if (strindex == (bfd_size_type) -1)
|
||
return -1;
|
||
|
||
if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
|
||
{
|
||
asection *sdyn;
|
||
const struct elf_backend_data *bed;
|
||
bfd_byte *extdyn;
|
||
|
||
bed = get_elf_backend_data (hash_table->dynobj);
|
||
sdyn = bfd_get_section_by_name (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;
|
||
}
|
||
|
||
/* Sort symbol by value and section. */
|
||
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;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* 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 = data;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
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_section_by_name (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:
|
||
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_section_by_name (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_section_by_name (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;
|
||
}
|
||
|
||
/* 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_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;
|
||
void *old_tab = NULL;
|
||
void *old_hash;
|
||
void *old_ent;
|
||
struct bfd_link_hash_entry *old_undefs = NULL;
|
||
struct bfd_link_hash_entry *old_undefs_tail = NULL;
|
||
long old_dynsymcount = 0;
|
||
size_t tabsize = 0;
|
||
size_t hashsize = 0;
|
||
|
||
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)
|
||
|| htab->root.creator != abfd->xvec)
|
||
{
|
||
if (info->relocatable)
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
else
|
||
bfd_set_error (bfd_error_wrong_format);
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* 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. */
|
||
if (info->executable)
|
||
{
|
||
asection *s;
|
||
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
const char *name;
|
||
|
||
name = bfd_get_section_name (abfd, s);
|
||
if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
|
||
{
|
||
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))
|
||
{
|
||
/* We don't want to issue this warning. Clobber
|
||
the section size so that the warning does not
|
||
get copied into the output file. */
|
||
s->size = 0;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
sz = s->size;
|
||
msg = 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)
|
||
{
|
||
/* 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;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
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. FIXME: If there are no input BFD's of the same
|
||
format as the output, we can't make a shared library. */
|
||
if (info->shared
|
||
&& is_elf_hash_table (htab)
|
||
&& htab->root.creator == 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
|
||
{
|
||
asection *s;
|
||
const char *soname = 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 ((s = abfd->sections) != NULL
|
||
&& s->sec_info_type == ELF_INFO_TYPE_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;
|
||
int elfsec;
|
||
unsigned long shlink;
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
|
||
goto error_free_dyn;
|
||
|
||
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
|
||
if (elfsec == -1)
|
||
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 = 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 = 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 = 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 = 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 = 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 = bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
{
|
||
error_free_dyn:
|
||
free (dynbuf);
|
||
goto error_return;
|
||
}
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = & rpath;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
}
|
||
|
||
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;
|
||
}
|
||
|
||
/* 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 = NULL;
|
||
if (extsymcount != 0)
|
||
{
|
||
isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
goto error_return;
|
||
|
||
/* We store a pointer to the hash table entry for each external
|
||
symbol. */
|
||
amt = extsymcount * sizeof (struct elf_link_hash_entry *);
|
||
sym_hash = bfd_alloc (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 = 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;
|
||
|
||
for (p = htab->root.table.table[i]; p != NULL; p = p->next)
|
||
entsize += htab->root.table.entsize;
|
||
}
|
||
|
||
tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
|
||
hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
|
||
old_tab = bfd_malloc (tabsize + entsize + hashsize);
|
||
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;
|
||
|
||
/* Clone the symbol table and sym hashes. Remember some
|
||
pointers into the symbol table, and dynamic symbol count. */
|
||
old_hash = (char *) old_tab + tabsize;
|
||
old_ent = (char *) old_hash + hashsize;
|
||
memcpy (old_tab, htab->root.table.table, tabsize);
|
||
memcpy (old_hash, sym_hash, hashsize);
|
||
old_undefs = htab->root.undefs;
|
||
old_undefs_tail = htab->root.undefs_tail;
|
||
old_dynsymcount = htab->dynsymcount;
|
||
|
||
for (i = 0; i < htab->root.table.size; i++)
|
||
{
|
||
struct bfd_hash_entry *p;
|
||
|
||
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;
|
||
}
|
||
}
|
||
}
|
||
|
||
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;
|
||
bfd_boolean definition;
|
||
bfd_boolean size_change_ok;
|
||
bfd_boolean type_change_ok;
|
||
bfd_boolean new_weakdef;
|
||
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;
|
||
*sym_hash = NULL;
|
||
common = bed->common_definition (isym);
|
||
|
||
bind = ELF_ST_BIND (isym->st_info);
|
||
if (bind == 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;
|
||
}
|
||
else if (bind == STB_GLOBAL)
|
||
{
|
||
if (isym->st_shndx != SHN_UNDEF && !common)
|
||
flags = BSF_GLOBAL;
|
||
}
|
||
else if (bind == STB_WEAK)
|
||
flags = BSF_WEAK;
|
||
else
|
||
{
|
||
/* Leave it up to the processor backend. */
|
||
}
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
sec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx < SHN_LORESERVE
|
||
|| isym->st_shndx > SHN_HIRESERVE)
|
||
{
|
||
sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
|
||
if (sec == NULL)
|
||
sec = bfd_abs_section_ptr;
|
||
else if (sec->kept_section)
|
||
{
|
||
/* Symbols from discarded section are undefined, and have
|
||
default visibility. */
|
||
sec = bfd_und_section_ptr;
|
||
isym->st_shndx = SHN_UNDEF;
|
||
isym->st_other = (STV_DEFAULT
|
||
| (isym->st_other & ~ ELF_ST_VISIBILITY (-1)));
|
||
}
|
||
else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
value -= sec->vma;
|
||
}
|
||
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
|
||
{
|
||
/* Leave it up to the processor backend. */
|
||
}
|
||
|
||
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
|
||
&& ELF_ST_TYPE (isym->st_info) == STT_TLS)
|
||
{
|
||
asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
|
||
|
||
if (tcomm == NULL)
|
||
{
|
||
tcomm = bfd_make_section_with_flags (abfd, ".tcommon",
|
||
(SEC_ALLOC
|
||
| SEC_IS_COMMON
|
||
| SEC_LINKER_CREATED
|
||
| SEC_THREAD_LOCAL));
|
||
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;
|
||
}
|
||
|
||
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_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)
|
||
|| ELF_ST_TYPE (isym->st_info) == STT_FUNC)))
|
||
{
|
||
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 = 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 (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
|
||
&value, &old_alignment,
|
||
sym_hash, &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;
|
||
|
||
/* Remember the old alignment if this is a common symbol, so
|
||
that we don't reduce the alignment later on. We can't
|
||
check later, because _bfd_generic_link_add_one_symbol
|
||
will set a default for the alignment which we want to
|
||
override. We also remember the old bfd where the existing
|
||
definition comes from. */
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
old_bfd = h->root.u.def.section->owner;
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
old_bfd = h->root.u.c.p->section->owner;
|
||
old_alignment = h->root.u.c.p->alignment_power;
|
||
break;
|
||
}
|
||
|
||
if (elf_tdata (abfd)->verdef != NULL
|
||
&& ! override
|
||
&& 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;
|
||
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_weakdef = FALSE;
|
||
if (dynamic
|
||
&& definition
|
||
&& (flags & BSF_WEAK) != 0
|
||
&& ELF_ST_TYPE (isym->st_info) != STT_FUNC
|
||
&& 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
|
||
/* Permit an alignment power of zero if an alignment of one
|
||
is specified and no other alignments have been specified. */
|
||
|| (isym->st_value == 1 && old_alignment == 0))
|
||
h->root.u.c.p->alignment_power = align;
|
||
else
|
||
h->root.u.c.p->alignment_power = old_alignment;
|
||
}
|
||
|
||
if (is_elf_hash_table (htab))
|
||
{
|
||
bfd_boolean dynsym;
|
||
|
||
/* 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;
|
||
|
||
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)
|
||
(*_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 and type. */
|
||
if (isym->st_size != 0
|
||
&& (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. */
|
||
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 || h->type == STT_NOTYPE))
|
||
{
|
||
if (h->type != STT_NOTYPE
|
||
&& h->type != ELF_ST_TYPE (isym->st_info)
|
||
&& ! type_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: type of symbol `%s' changed"
|
||
" from %d to %d in %B"),
|
||
abfd, name, h->type, ELF_ST_TYPE (isym->st_info));
|
||
|
||
h->type = ELF_ST_TYPE (isym->st_info);
|
||
}
|
||
|
||
/* If st_other has a processor-specific meaning, specific
|
||
code might be needed here. We never merge the visibility
|
||
attribute with the one from a dynamic object. */
|
||
if (bed->elf_backend_merge_symbol_attribute)
|
||
(*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
|
||
dynamic);
|
||
|
||
/* 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
|
||
|| (abfd->my_archive && abfd->my_archive->no_export))
|
||
&& ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
|
||
isym->st_other = (STV_HIDDEN
|
||
| (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
|
||
|
||
if (isym->st_other != 0 && !dynamic)
|
||
{
|
||
unsigned char hvis, symvis, other, nvis;
|
||
|
||
/* Take the balance of OTHER from the definition. */
|
||
other = (definition ? isym->st_other : h->other);
|
||
other &= ~ ELF_ST_VISIBILITY (-1);
|
||
|
||
/* Combine visibilities, using the most constraining one. */
|
||
hvis = ELF_ST_VISIBILITY (h->other);
|
||
symvis = ELF_ST_VISIBILITY (isym->st_other);
|
||
if (! hvis)
|
||
nvis = symvis;
|
||
else if (! symvis)
|
||
nvis = hvis;
|
||
else
|
||
nvis = hvis < symvis ? hvis : symvis;
|
||
|
||
h->other = other | nvis;
|
||
}
|
||
|
||
/* Set a flag in the hash table entry indicating the type of
|
||
reference or definition we just found. Keep a count of
|
||
the number of dynamic symbols we find. A dynamic symbol
|
||
is one which is referenced or defined by both a regular
|
||
object and a shared object. */
|
||
dynsym = FALSE;
|
||
if (! dynamic)
|
||
{
|
||
if (! definition)
|
||
{
|
||
h->ref_regular = 1;
|
||
if (bind != STB_WEAK)
|
||
h->ref_regular_nonweak = 1;
|
||
}
|
||
else
|
||
h->def_regular = 1;
|
||
if (! info->executable
|
||
|| h->def_dynamic
|
||
|| h->ref_dynamic)
|
||
dynsym = TRUE;
|
||
}
|
||
else
|
||
{
|
||
if (! definition)
|
||
h->ref_dynamic = 1;
|
||
else
|
||
h->def_dynamic = 1;
|
||
if (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 || h->root.type == bfd_link_hash_common)
|
||
if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
|
||
&sec, &value, &dynsym,
|
||
override))
|
||
goto error_free_vers;
|
||
|
||
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 = bfd_malloc (amt);
|
||
}
|
||
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;
|
||
}
|
||
|
||
if (!add_needed
|
||
&& definition
|
||
&& dynsym
|
||
&& h->ref_regular)
|
||
{
|
||
int ret;
|
||
const char *soname = elf_dt_name (abfd);
|
||
|
||
/* 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. */
|
||
if ((elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: invalid DSO for symbol `%s' definition"),
|
||
abfd, name);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
|
||
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_hash = (char *) old_tab + tabsize;
|
||
old_ent = (char *) old_hash + hashsize;
|
||
sym_hash = elf_sym_hashes (abfd);
|
||
memcpy (htab->root.table.table, old_tab, tabsize);
|
||
memcpy (sym_hash, old_hash, hashsize);
|
||
htab->root.undefs = old_undefs;
|
||
htab->root.undefs_tail = old_undefs_tail;
|
||
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)
|
||
{
|
||
h = (struct elf_link_hash_entry *) p;
|
||
if (h->dynindx >= old_dynsymcount)
|
||
_bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
|
||
memcpy (p, old_ent, htab->root.table.entsize);
|
||
old_ent = (char *) old_ent + htab->root.table.entsize;
|
||
}
|
||
}
|
||
|
||
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)
|
||
{
|
||
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 = bfd_malloc (amt + 1);
|
||
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 = 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
|
||
&& h->type != STT_FUNC)
|
||
{
|
||
*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;
|
||
long ilook;
|
||
size_t i, j, idx;
|
||
|
||
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;
|
||
|
||
ilook = -1;
|
||
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
|
||
{
|
||
ilook = idx;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We didn't find a value/section match. */
|
||
if (ilook == -1)
|
||
continue;
|
||
|
||
for (i = ilook; i < sym_count; i++)
|
||
{
|
||
h = sorted_sym_hash [i];
|
||
|
||
/* Stop if value or section doesn't match. */
|
||
if (h->root.u.def.value != vlook
|
||
|| h->root.u.def.section != slook)
|
||
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))
|
||
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 error_return;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
free (sorted_sym_hash);
|
||
}
|
||
|
||
if (bed->check_directives)
|
||
(*bed->check_directives) (abfd, info);
|
||
|
||
/* 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)
|
||
&& htab->root.creator == abfd->xvec
|
||
&& bed->check_relocs != NULL)
|
||
{
|
||
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 (strncmp (".stab", stab->name, 5) == 0
|
||
&& (!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 = ELF_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 = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
|
||
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, FALSE);
|
||
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 = 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, FALSE);
|
||
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, FALSE);
|
||
}
|
||
|
||
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 of a
|
||
problem which arises on UnixWare. The UnixWare libc.so is an
|
||
archive which includes an entry libc.so.1 which defines a bunch of
|
||
symbols. The libc.so archive also includes a number of other
|
||
object files, which also define symbols, some of which are the same
|
||
as those defined in libc.so.1. Correct linking requires that we
|
||
consider each object file in turn, and include it if it defines any
|
||
symbols we need. _bfd_generic_link_add_archive_symbols does not do
|
||
this; it looks through the list of undefined symbols, and includes
|
||
any object file which defines them. When this algorithm is used on
|
||
UnixWare, it winds up pulling in libc.so.1 early and defining a
|
||
bunch of symbols. This means that some of the other objects in the
|
||
archive are not included in the link, which is incorrect since they
|
||
precede libc.so.1 in the archive.
|
||
|
||
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;
|
||
bfd_boolean *defined = NULL;
|
||
bfd_boolean *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 (bfd_boolean);
|
||
defined = bfd_zmalloc (amt);
|
||
included = bfd_zmalloc (amt);
|
||
if (defined == NULL || included == NULL)
|
||
goto error_return;
|
||
|
||
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 (defined[i] || 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)
|
||
defined[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;
|
||
|
||
/* Doublecheck that we have not included this object
|
||
already--it should be impossible, but there may be
|
||
something wrong with the archive. */
|
||
if (element->archive_pass != 0)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
element->archive_pass = 1;
|
||
|
||
undefs_tail = info->hash->undefs_tail;
|
||
|
||
if (! (*info->callbacks->add_archive_element) (info, element,
|
||
symdef->name))
|
||
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 (defined);
|
||
free (included);
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (defined != NULL)
|
||
free (defined);
|
||
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;
|
||
}
|
||
}
|
||
|
||
/* 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)
|
||
{
|
||
unsigned long **valuep = data;
|
||
const char *name;
|
||
char *p;
|
||
unsigned long ha;
|
||
char *alc = NULL;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* 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 = bfd_malloc (p - name + 1);
|
||
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. */
|
||
*(*valuep)++ = 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;
|
||
}
|
||
|
||
/* 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)
|
||
{
|
||
size_t dynsymcount = elf_hash_table (info)->dynsymcount;
|
||
size_t best_size = 0;
|
||
unsigned long int *hashcodes;
|
||
unsigned long int *hashcodesp;
|
||
unsigned long int i;
|
||
bfd_size_type amt;
|
||
|
||
/* 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;
|
||
amt *= sizeof (unsigned long int);
|
||
hashcodes = bfd_malloc (amt);
|
||
if (hashcodes == NULL)
|
||
return 0;
|
||
hashcodesp = hashcodes;
|
||
|
||
/* Put all hash values in HASHCODES. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_collect_hash_codes, &hashcodesp);
|
||
|
||
/* 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)
|
||
{
|
||
unsigned long int nsyms = hashcodesp - hashcodes;
|
||
size_t minsize;
|
||
size_t maxsize;
|
||
BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
|
||
unsigned long int *counts ;
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
|
||
|
||
/* 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;
|
||
|
||
/* 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 = bfd_malloc (amt);
|
||
if (counts == NULL)
|
||
{
|
||
free (hashcodes);
|
||
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;
|
||
|
||
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 + NSYMS entries for the size values and
|
||
the chains. */
|
||
max = (2 + nsyms) * (bed->s->arch_size / 8);
|
||
|
||
# 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->arch_size / 8)) + 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->arch_size / 8)) + 1;
|
||
max *= fact;
|
||
# endif
|
||
|
||
/* Compare with current best results. */
|
||
if (max < best_chlen)
|
||
{
|
||
best_chlen = max;
|
||
best_size = i;
|
||
}
|
||
}
|
||
|
||
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 (dynsymcount < elf_buckets[i + 1])
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Free the arrays we needed. */
|
||
free (hashcodes);
|
||
|
||
return best_size;
|
||
}
|
||
|
||
/* 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 * const *auxiliary_filters,
|
||
struct bfd_link_info *info,
|
||
asection **sinterpptr,
|
||
struct bfd_elf_version_tree *verdefs)
|
||
{
|
||
bfd_size_type soname_indx;
|
||
bfd *dynobj;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_assign_sym_version_info asvinfo;
|
||
|
||
*sinterpptr = NULL;
|
||
|
||
soname_indx = (bfd_size_type) -1;
|
||
|
||
if (!is_elf_hash_table (info->hash))
|
||
return TRUE;
|
||
|
||
elf_tdata (output_bfd)->relro = info->relro;
|
||
if (info->execstack)
|
||
elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
|
||
else if (info->noexecstack)
|
||
elf_tdata (output_bfd)->stack_flags = 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 | 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
|
||
exec = PF_X;
|
||
}
|
||
if (notesec)
|
||
{
|
||
elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
|
||
if (exec && info->relocatable
|
||
&& notesec->output_section != bfd_abs_section_ptr)
|
||
notesec->output_section->flags |= SEC_CODE;
|
||
}
|
||
}
|
||
|
||
/* 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;
|
||
|
||
/* The backend may have to create some sections regardless of whether
|
||
we're dynamic or not. */
|
||
bed = get_elf_backend_data (output_bfd);
|
||
if (bed->elf_backend_always_size_sections
|
||
&& ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
|
||
return FALSE;
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
/* If there were no dynamic objects in the link, there is nothing to
|
||
do here. */
|
||
if (dynobj == NULL)
|
||
return TRUE;
|
||
|
||
if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
|
||
return FALSE;
|
||
|
||
if (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_section_by_name (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;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
|
||
TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
|
||
return FALSE;
|
||
|
||
if (info->new_dtags)
|
||
{
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
|
||
if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, 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;
|
||
}
|
||
}
|
||
|
||
eif.info = info;
|
||
eif.verdefs = verdefs;
|
||
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)
|
||
{
|
||
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 = verdefs; t != NULL; t = t->next)
|
||
for (d = t->globals.list; d != NULL; d = d->next)
|
||
if (!d->symver && d->symbol)
|
||
{
|
||
const char *verstr, *name;
|
||
size_t namelen, verlen, newlen;
|
||
char *newname, *p;
|
||
struct elf_link_hash_entry *newh;
|
||
|
||
name = d->symbol;
|
||
namelen = strlen (name);
|
||
verstr = t->name;
|
||
verlen = strlen (verstr);
|
||
newlen = namelen + verlen + 3;
|
||
|
||
newname = bfd_malloc (newlen);
|
||
if (newname == NULL)
|
||
return FALSE;
|
||
memcpy (newname, 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.output_bfd = output_bfd;
|
||
asvinfo.info = info;
|
||
asvinfo.verdefs = verdefs;
|
||
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 = verdefs; t != NULL; t = t->next)
|
||
for (d = t->globals.list; d != NULL; d = d->next)
|
||
if (!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)
|
||
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_section_by_name (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 (!_bfd_elf_add_dynamic_entry (info, DT_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 (bed->elf_backend_size_dynamic_sections
|
||
&& ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
|
||
return FALSE;
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
unsigned long section_sym_count;
|
||
asection *s;
|
||
|
||
/* Set up the version definition section. */
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
/* We may have created additional version definitions if we are
|
||
just linking a regular application. */
|
||
verdefs = asvinfo.verdefs;
|
||
|
||
/* 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;
|
||
|
||
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 = 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;
|
||
|
||
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 (t->next != NULL)
|
||
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_section_by_name (dynobj, ".gnu.version_r");
|
||
BFD_ASSERT (s != NULL);
|
||
{
|
||
struct elf_find_verdep_info sinfo;
|
||
|
||
sinfo.output_bfd = output_bfd;
|
||
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 (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 definition 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 = 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_section_by_name (dynobj, ".gnu.version");
|
||
s->flags |= SEC_EXCLUDE;
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
bfd_boolean
|
||
bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
if (!is_elf_hash_table (info->hash))
|
||
return TRUE;
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
bfd *dynobj;
|
||
const struct elf_backend_data *bed;
|
||
asection *s;
|
||
bfd_size_type dynsymcount;
|
||
unsigned long section_sym_count;
|
||
size_t bucketcount = 0;
|
||
size_t hash_entry_size;
|
||
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_section_by_name (dynobj, ".gnu.version");
|
||
BFD_ASSERT (s != NULL);
|
||
if (dynsymcount != 0
|
||
&& (s->flags & SEC_EXCLUDE) == 0)
|
||
{
|
||
s->size = dynsymcount * sizeof (Elf_External_Versym);
|
||
s->contents = 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_section_by_name (dynobj, ".dynsym");
|
||
BFD_ASSERT (s != NULL);
|
||
bed = get_elf_backend_data (output_bfd);
|
||
s->size = dynsymcount * bed->s->sizeof_sym;
|
||
|
||
if (dynsymcount != 0)
|
||
{
|
||
s->contents = 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);
|
||
}
|
||
|
||
/* Compute the size of the hashing table. As a side effect this
|
||
computes the hash values for all the names we export. */
|
||
bucketcount = compute_bucket_count (info);
|
||
|
||
s = bfd_get_section_by_name (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 = 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);
|
||
|
||
elf_hash_table (info)->bucketcount = bucketcount;
|
||
|
||
s = bfd_get_section_by_name (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;
|
||
}
|
||
|
||
/* 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 bfd_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 to hold swapped out symbols. */
|
||
bfd_byte *symbuf;
|
||
/* And one for symbol section indices. */
|
||
Elf_External_Sym_Shndx *symshndxbuf;
|
||
/* Number of swapped out symbols in buffer. */
|
||
size_t symbuf_count;
|
||
/* Number of symbols which fit in symbuf. */
|
||
size_t symbuf_size;
|
||
/* And same for symshndxbuf. */
|
||
size_t shndxbuf_size;
|
||
};
|
||
|
||
/* This struct is used to pass information to elf_link_output_extsym. */
|
||
|
||
struct elf_outext_info
|
||
{
|
||
bfd_boolean failed;
|
||
bfd_boolean localsyms;
|
||
struct elf_final_link_info *finfo;
|
||
};
|
||
|
||
/* 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 in
|
||
REL_HDR (there are COUNT of them), using the data in REL_HASH. */
|
||
|
||
static void
|
||
elf_link_adjust_relocs (bfd *abfd,
|
||
Elf_Internal_Shdr *rel_hdr,
|
||
unsigned int count,
|
||
struct elf_link_hash_entry **rel_hash)
|
||
{
|
||
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;
|
||
|
||
if (rel_hdr->sh_entsize == bed->s->sizeof_rel)
|
||
{
|
||
swap_in = bed->s->swap_reloc_in;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
else if (rel_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 = rel_hdr->contents;
|
||
for (i = 0; i < count; i++, rel_hash++, erela += rel_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);
|
||
}
|
||
}
|
||
|
||
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 = A;
|
||
const struct elf_link_sort_rela *b = 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 = A;
|
||
const struct elf_link_sort_rela *b = B;
|
||
int copya, copyb;
|
||
|
||
if (a->u.offset < b->u.offset)
|
||
return -1;
|
||
if (a->u.offset > b->u.offset)
|
||
return 1;
|
||
copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
|
||
copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
|
||
if (copya < copyb)
|
||
return -1;
|
||
if (copya > copyb)
|
||
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 *reldyn;
|
||
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;
|
||
|
||
reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
|
||
if (reldyn == NULL || reldyn->size == 0)
|
||
{
|
||
reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
|
||
if (reldyn == NULL || reldyn->size == 0)
|
||
return 0;
|
||
ext_size = bed->s->sizeof_rel;
|
||
swap_in = bed->s->swap_reloc_in;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
else
|
||
{
|
||
ext_size = bed->s->sizeof_rela;
|
||
swap_in = bed->s->swap_reloca_in;
|
||
swap_out = bed->s->swap_reloca_out;
|
||
}
|
||
count = reldyn->size / ext_size;
|
||
|
||
size = 0;
|
||
for (lo = reldyn->map_head.link_order; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
asection *o = lo->u.indirect.section;
|
||
size += o->size;
|
||
}
|
||
|
||
if (size != reldyn->size)
|
||
return 0;
|
||
|
||
sort_elt = (sizeof (struct elf_link_sort_rela)
|
||
+ (i2e - 1) * sizeof (Elf_Internal_Rela));
|
||
sort = 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 = reldyn->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;
|
||
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) (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 = reldyn->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;
|
||
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 = reldyn;
|
||
return ret;
|
||
}
|
||
|
||
/* Flush the output symbols to the file. */
|
||
|
||
static bfd_boolean
|
||
elf_link_flush_output_syms (struct elf_final_link_info *finfo,
|
||
const struct elf_backend_data *bed)
|
||
{
|
||
if (finfo->symbuf_count > 0)
|
||
{
|
||
Elf_Internal_Shdr *hdr;
|
||
file_ptr pos;
|
||
bfd_size_type amt;
|
||
|
||
hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
|
||
pos = hdr->sh_offset + hdr->sh_size;
|
||
amt = finfo->symbuf_count * bed->s->sizeof_sym;
|
||
if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
|
||
|| bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
|
||
return FALSE;
|
||
|
||
hdr->sh_size += amt;
|
||
finfo->symbuf_count = 0;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Add a symbol to the output symbol table. */
|
||
|
||
static bfd_boolean
|
||
elf_link_output_sym (struct elf_final_link_info *finfo,
|
||
const char *name,
|
||
Elf_Internal_Sym *elfsym,
|
||
asection *input_sec,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
bfd_byte *dest;
|
||
Elf_External_Sym_Shndx *destshndx;
|
||
bfd_boolean (*output_symbol_hook)
|
||
(struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
|
||
struct elf_link_hash_entry *);
|
||
const struct elf_backend_data *bed;
|
||
|
||
bed = get_elf_backend_data (finfo->output_bfd);
|
||
output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
|
||
if (output_symbol_hook != NULL)
|
||
{
|
||
if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h))
|
||
return FALSE;
|
||
}
|
||
|
||
if (name == NULL || *name == '\0')
|
||
elfsym->st_name = 0;
|
||
else if (input_sec->flags & SEC_EXCLUDE)
|
||
elfsym->st_name = 0;
|
||
else
|
||
{
|
||
elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
|
||
name, TRUE, FALSE);
|
||
if (elfsym->st_name == (unsigned long) -1)
|
||
return FALSE;
|
||
}
|
||
|
||
if (finfo->symbuf_count >= finfo->symbuf_size)
|
||
{
|
||
if (! elf_link_flush_output_syms (finfo, bed))
|
||
return FALSE;
|
||
}
|
||
|
||
dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
|
||
destshndx = finfo->symshndxbuf;
|
||
if (destshndx != NULL)
|
||
{
|
||
if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
|
||
{
|
||
bfd_size_type amt;
|
||
|
||
amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
|
||
finfo->symshndxbuf = destshndx = bfd_realloc (destshndx, amt * 2);
|
||
if (destshndx == NULL)
|
||
return FALSE;
|
||
memset ((char *) destshndx + amt, 0, amt);
|
||
finfo->shndxbuf_size *= 2;
|
||
}
|
||
destshndx += bfd_get_symcount (finfo->output_bfd);
|
||
}
|
||
|
||
bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
|
||
finfo->symbuf_count += 1;
|
||
bfd_get_symcount (finfo->output_bfd) += 1;
|
||
|
||
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;
|
||
|
||
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 = 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)
|
||
{
|
||
/* If we have a non-hidden versioned sym, then it should
|
||
have provided a definition for the undefined sym. */
|
||
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 elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_outext_info *eoinfo = data;
|
||
struct elf_final_link_info *finfo = eoinfo->finfo;
|
||
bfd_boolean strip;
|
||
Elf_Internal_Sym sym;
|
||
asection *input_sec;
|
||
const struct elf_backend_data *bed;
|
||
|
||
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 (finfo->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). */
|
||
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 == FALSE
|
||
&& h->ref_dynamic
|
||
&& ! h->ref_regular
|
||
&& ! elf_link_check_versioned_symbol (finfo->info, bed, h)
|
||
&& finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
|
||
{
|
||
if (! (finfo->info->callbacks->undefined_symbol
|
||
(finfo->info, h->root.root.string, h->root.u.undef.abfd,
|
||
NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* We should also warn if a forced local symbol is referenced from
|
||
shared libraries. */
|
||
if (! finfo->info->relocatable
|
||
&& (! finfo->info->shared)
|
||
&& h->forced_local
|
||
&& h->ref_dynamic
|
||
&& !h->dynamic_def
|
||
&& !h->dynamic_weak
|
||
&& ! elf_link_check_versioned_symbol (finfo->info, bed, h))
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: %s symbol `%s' in %B is referenced by DSO"),
|
||
finfo->output_bfd,
|
||
h->root.u.def.section == bfd_abs_section_ptr
|
||
? finfo->output_bfd : h->root.u.def.section->owner,
|
||
ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
|
||
? "internal"
|
||
: ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
|
||
? "hidden" : "local",
|
||
h->root.root.string);
|
||
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. */
|
||
if (h->indx == -2)
|
||
strip = FALSE;
|
||
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 (finfo->info->strip == strip_all)
|
||
strip = TRUE;
|
||
else if (finfo->info->strip == strip_some
|
||
&& bfd_hash_lookup (finfo->info->keep_hash,
|
||
h->root.root.string, FALSE, FALSE) == NULL)
|
||
strip = TRUE;
|
||
else if (finfo->info->strip_discarded
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& elf_discarded_section (h->root.u.def.section))
|
||
strip = TRUE;
|
||
else
|
||
strip = FALSE;
|
||
|
||
/* If we're stripping it, and it's not a dynamic symbol, there's
|
||
nothing else to do unless it is a forced local symbol. */
|
||
if (strip
|
||
&& h->dynindx == -1
|
||
&& !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);
|
||
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);
|
||
|
||
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 (finfo->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"),
|
||
finfo->output_bfd, input_sec->output_section, input_sec);
|
||
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 (! finfo->info->relocatable)
|
||
{
|
||
sym.st_value += input_sec->output_section->vma;
|
||
if (h->type == STT_TLS)
|
||
{
|
||
/* STT_TLS symbols are relative to PT_TLS segment
|
||
base. */
|
||
BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
|
||
sym.st_value -= elf_hash_table (finfo->info)->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. */
|
||
if ((h->dynindx != -1
|
||
|| h->forced_local)
|
||
&& ((finfo->info->shared
|
||
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak))
|
||
|| !h->forced_local)
|
||
&& elf_hash_table (finfo->info)->dynamic_sections_created)
|
||
{
|
||
if (! ((*bed->elf_backend_finish_dynamic_symbol)
|
||
(finfo->output_bfd, finfo->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;
|
||
|
||
if (h->ref_regular_nonweak)
|
||
bindtype = STB_GLOBAL;
|
||
else
|
||
bindtype = STB_WEAK;
|
||
sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
|
||
}
|
||
|
||
/* If a non-weak symbol with non-default visibility is not defined
|
||
locally, it is a fatal error. */
|
||
if (! finfo->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)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%B: %s symbol `%s' isn't defined"),
|
||
finfo->output_bfd,
|
||
ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
|
||
? "protected"
|
||
: ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
|
||
? "internal" : "hidden",
|
||
h->root.root.string);
|
||
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 (h->dynindx != -1
|
||
&& elf_hash_table (finfo->info)->dynamic_sections_created)
|
||
{
|
||
size_t bucketcount;
|
||
size_t bucket;
|
||
size_t hash_entry_size;
|
||
bfd_byte *bucketpos;
|
||
bfd_vma chain;
|
||
bfd_byte *esym;
|
||
|
||
sym.st_name = h->dynstr_index;
|
||
esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
|
||
bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
|
||
|
||
bucketcount = elf_hash_table (finfo->info)->bucketcount;
|
||
bucket = h->u.elf_hash_value % bucketcount;
|
||
hash_entry_size
|
||
= elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
|
||
bucketpos = ((bfd_byte *) finfo->hash_sec->contents
|
||
+ (bucket + 2) * hash_entry_size);
|
||
chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
|
||
bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
|
||
bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
|
||
((bfd_byte *) finfo->hash_sec->contents
|
||
+ (bucketcount + 2 + h->dynindx) * hash_entry_size));
|
||
|
||
if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
|
||
{
|
||
Elf_Internal_Versym iversym;
|
||
Elf_External_Versym *eversym;
|
||
|
||
if (!h->def_regular)
|
||
{
|
||
if (h->verinfo.verdef == NULL)
|
||
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 (finfo->info->create_default_symver)
|
||
iversym.vs_vers++;
|
||
}
|
||
|
||
if (h->hidden)
|
||
iversym.vs_vers |= VERSYM_HIDDEN;
|
||
|
||
eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
|
||
eversym += h->dynindx;
|
||
_bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
|
||
}
|
||
}
|
||
|
||
/* If we're stripping it, then it was just a dynamic symbol, and
|
||
there's nothing else to do. */
|
||
if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
|
||
return TRUE;
|
||
|
||
h->indx = bfd_get_symcount (finfo->output_bfd);
|
||
|
||
if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
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 ELF_INFO_TYPE_STABS:
|
||
case ELF_INFO_TYPE_EH_FRAME:
|
||
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 0;
|
||
|
||
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)
|
||
{
|
||
asection *first = elf_next_in_group (group);
|
||
asection *s = first;
|
||
|
||
while (s != NULL)
|
||
{
|
||
if (bfd_elf_match_symbols_in_sections (s, sec))
|
||
return 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)
|
||
{
|
||
asection *kept;
|
||
|
||
kept = sec->kept_section;
|
||
if (kept != NULL)
|
||
{
|
||
if (elf_sec_group (sec) != NULL)
|
||
kept = match_group_member (sec, kept);
|
||
if (kept != NULL && sec->size != kept->size)
|
||
kept = NULL;
|
||
}
|
||
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 *finfo, bfd *input_bfd)
|
||
{
|
||
bfd_boolean (*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;
|
||
bfd_boolean emit_relocs;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
|
||
output_bfd = finfo->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;
|
||
|
||
emit_relocs = (finfo->info->relocatable
|
||
|| finfo->info->emitrelocations);
|
||
|
||
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,
|
||
finfo->internal_syms,
|
||
finfo->external_syms,
|
||
finfo->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 = finfo->indices, ppsection = finfo->sections;
|
||
isym < isymend;
|
||
isym++, pindex++, ppsection++)
|
||
{
|
||
asection *isec;
|
||
const char *name;
|
||
Elf_Internal_Sym osym;
|
||
|
||
*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_LORESERVE
|
||
|| isym->st_shndx > SHN_HIRESERVE)
|
||
{
|
||
isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
|
||
if (isec
|
||
&& isec->sec_info_type == ELF_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);
|
||
}
|
||
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
|
||
{
|
||
/* Don't attempt to output symbols with st_shnx in the
|
||
reserved range other than SHN_ABS and SHN_COMMON. */
|
||
*ppsection = NULL;
|
||
continue;
|
||
}
|
||
|
||
*ppsection = isec;
|
||
|
||
/* Don't output the first, undefined, symbol. */
|
||
if (ppsection == finfo->sections)
|
||
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 (finfo->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 (finfo->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 || isym->st_shndx > SHN_HIRESERVE)
|
||
&& (isec == NULL
|
||
|| 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 ((finfo->info->strip == strip_some
|
||
&& (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
|
||
== NULL))
|
||
|| (((finfo->info->discard == discard_sec_merge
|
||
&& (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
|
||
|| finfo->info->discard == discard_l)
|
||
&& bfd_is_local_label_name (input_bfd, name)))
|
||
continue;
|
||
|
||
/* If we get here, we are going to output this symbol. */
|
||
|
||
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;
|
||
|
||
*pindex = bfd_get_symcount (output_bfd);
|
||
|
||
/* 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 (! finfo->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 (finfo->info)->tls_sec != NULL);
|
||
osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
|
||
}
|
||
}
|
||
|
||
if (! elf_link_output_sym (finfo, name, &osym, isec, NULL))
|
||
return FALSE;
|
||
}
|
||
|
||
/* 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 ((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;
|
||
else
|
||
{
|
||
bfd_size_type amt = o->rawsize ? o->rawsize : o->size;
|
||
|
||
contents = finfo->contents;
|
||
if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt))
|
||
return FALSE;
|
||
}
|
||
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
bfd_vma r_type_mask;
|
||
int r_sym_shift;
|
||
|
||
/* Get the swapped relocs. */
|
||
internal_relocs
|
||
= _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
|
||
finfo->internal_relocs, FALSE);
|
||
if (internal_relocs == NULL
|
||
&& o->reloc_count > 0)
|
||
return FALSE;
|
||
|
||
if (bed->s->arch_size == 32)
|
||
{
|
||
r_type_mask = 0xff;
|
||
r_sym_shift = 8;
|
||
}
|
||
else
|
||
{
|
||
r_type_mask = 0xffffffff;
|
||
r_sym_shift = 32;
|
||
}
|
||
|
||
/* Run through the relocs looking for any against symbols
|
||
from discarded sections and section symbols from
|
||
removed link-once sections. Complain about relocs
|
||
against discarded sections. Zero relocs against removed
|
||
link-once sections. */
|
||
if (!elf_section_ignore_discarded_relocs (o))
|
||
{
|
||
Elf_Internal_Rela *rel, *relend;
|
||
unsigned int action = (*bed->action_discarded) (o);
|
||
|
||
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;
|
||
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)
|
||
&& finfo->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;
|
||
|
||
if (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
continue;
|
||
|
||
ps = &h->root.u.def.section;
|
||
sym_name = h->root.root.string;
|
||
}
|
||
else
|
||
{
|
||
Elf_Internal_Sym *sym = isymbuf + r_symndx;
|
||
ps = &finfo->sections[r_symndx];
|
||
sym_name = bfd_elf_sym_name (input_bfd,
|
||
symtab_hdr,
|
||
sym, *ps);
|
||
}
|
||
|
||
/* Complain if the definition comes from a
|
||
discarded section. */
|
||
if ((sec = *ps) != NULL && elf_discarded_section (sec))
|
||
{
|
||
BFD_ASSERT (r_symndx != 0);
|
||
if (action & COMPLAIN)
|
||
(*finfo->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 & PRETEND)
|
||
{
|
||
asection *kept;
|
||
|
||
kept = _bfd_elf_check_kept_section (sec);
|
||
if (kept != NULL)
|
||
{
|
||
*ps = kept;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
/* Remove the symbol reference from the reloc, but
|
||
don't kill the reloc completely. This is so that
|
||
a zero value will be written into the section,
|
||
which may have non-zero contents put there by the
|
||
assembler. Zero in things like an eh_frame fde
|
||
pc_begin allows stack unwinders to recognize the
|
||
fde as bogus. */
|
||
rel->r_info &= r_type_mask;
|
||
rel->r_addend = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
if (! (*relocate_section) (output_bfd, finfo->info,
|
||
input_bfd, o, contents,
|
||
internal_relocs,
|
||
isymbuf,
|
||
finfo->sections))
|
||
return FALSE;
|
||
|
||
if (emit_relocs)
|
||
{
|
||
Elf_Internal_Rela *irela;
|
||
Elf_Internal_Rela *irelaend;
|
||
bfd_vma last_offset;
|
||
struct elf_link_hash_entry **rel_hash;
|
||
struct elf_link_hash_entry **rel_hash_list;
|
||
Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
|
||
unsigned int next_erel;
|
||
bfd_boolean rela_normal;
|
||
|
||
input_rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
rela_normal = (bed->rela_normal
|
||
&& (input_rel_hdr->sh_entsize
|
||
== bed->s->sizeof_rela));
|
||
|
||
/* Adjust the reloc addresses and symbol indices. */
|
||
|
||
irela = internal_relocs;
|
||
irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
rel_hash = (elf_section_data (o->output_section)->rel_hashes
|
||
+ elf_section_data (o->output_section)->rel_count
|
||
+ elf_section_data (o->output_section)->rel_count2);
|
||
rel_hash_list = rel_hash;
|
||
last_offset = o->output_offset;
|
||
if (!finfo->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;
|
||
}
|
||
|
||
irela->r_offset = _bfd_elf_section_offset (output_bfd,
|
||
finfo->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
|
||
elf_bfd_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 (!finfo->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)
|
||
&& finfo->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 = finfo->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 = 0;
|
||
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 link-once and discarded
|
||
SEC_MERGE sections, use the kept section. */
|
||
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;
|
||
BFD_ASSERT (r_symndx != 0);
|
||
}
|
||
}
|
||
|
||
/* 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 (finfo->indices[r_symndx] == -1)
|
||
{
|
||
unsigned long shlink;
|
||
const char *name;
|
||
asection *osec;
|
||
|
||
if (finfo->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 (! finfo->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 (finfo->info)
|
||
->tls_sec != NULL);
|
||
sym.st_value -= (elf_hash_table (finfo->info)
|
||
->tls_sec->vma);
|
||
}
|
||
}
|
||
|
||
finfo->indices[r_symndx]
|
||
= bfd_get_symcount (output_bfd);
|
||
|
||
if (! elf_link_output_sym (finfo, name, &sym, sec,
|
||
NULL))
|
||
return FALSE;
|
||
}
|
||
|
||
r_symndx = finfo->indices[r_symndx];
|
||
}
|
||
|
||
irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
|
||
| (irela->r_info & r_type_mask));
|
||
}
|
||
|
||
/* Swap out the relocs. */
|
||
if (input_rel_hdr->sh_size != 0
|
||
&& !bed->elf_backend_emit_relocs (output_bfd, o,
|
||
input_rel_hdr,
|
||
internal_relocs,
|
||
rel_hash_list))
|
||
return FALSE;
|
||
|
||
input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
|
||
if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
|
||
{
|
||
internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
|
||
* bed->s->int_rels_per_ext_rel);
|
||
rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
|
||
if (!bed->elf_backend_emit_relocs (output_bfd, o,
|
||
input_rel_hdr2,
|
||
internal_relocs,
|
||
rel_hash_list))
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Write out the modified section contents. */
|
||
if (bed->elf_backend_write_section
|
||
&& (*bed->elf_backend_write_section) (output_bfd, o, contents))
|
||
{
|
||
/* Section written out. */
|
||
}
|
||
else switch (o->sec_info_type)
|
||
{
|
||
case ELF_INFO_TYPE_STABS:
|
||
if (! (_bfd_write_section_stabs
|
||
(output_bfd,
|
||
&elf_hash_table (finfo->info)->stab_info,
|
||
o, &elf_section_data (o)->sec_info, contents)))
|
||
return FALSE;
|
||
break;
|
||
case ELF_INFO_TYPE_MERGE:
|
||
if (! _bfd_write_merged_section (output_bfd, o,
|
||
elf_section_data (o)->sec_info))
|
||
return FALSE;
|
||
break;
|
||
case ELF_INFO_TYPE_EH_FRAME:
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
|
||
o, contents))
|
||
return FALSE;
|
||
}
|
||
break;
|
||
default:
|
||
{
|
||
if (! (o->flags & SEC_EXCLUDE)
|
||
&& ! bfd_set_section_contents (output_bfd, o->output_section,
|
||
contents,
|
||
(file_ptr) o->output_offset,
|
||
o->size))
|
||
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 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;
|
||
|
||
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;
|
||
|
||
/* Figure out the symbol index. */
|
||
rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
|
||
+ elf_section_data (output_section)->rel_count
|
||
+ elf_section_data (output_section)->rel_count2);
|
||
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_get_reloc_size (howto);
|
||
buf = bfd_zmalloc (size);
|
||
if (buf == NULL)
|
||
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 = &elf_section_data (output_section)->rel_hdr;
|
||
erel = rel_hdr->contents;
|
||
if (rel_hdr->sh_type == SHT_REL)
|
||
{
|
||
erel += (elf_section_data (output_section)->rel_count
|
||
* bed->s->sizeof_rel);
|
||
(*bed->s->swap_reloc_out) (output_bfd, irel, erel);
|
||
}
|
||
else
|
||
{
|
||
irel[0].r_addend = addend;
|
||
erel += (elf_section_data (output_section)->rel_count
|
||
* bed->s->sizeof_rela);
|
||
(*bed->s->swap_reloca_out) (output_bfd, irel, erel);
|
||
}
|
||
|
||
++elf_section_data (output_section)->rel_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);
|
||
int 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)) != -1
|
||
&& elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER)
|
||
{
|
||
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 **)
|
||
xmalloc (seen_linkorder * sizeof (struct bfd_link_order *));
|
||
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)((1 << s->alignment_power) - 1);
|
||
s->output_offset = offset;
|
||
sections[n]->offset = offset;
|
||
offset += sections[n]->size;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/* 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 finfo;
|
||
register asection *o;
|
||
register struct bfd_link_order *p;
|
||
register 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;
|
||
file_ptr off;
|
||
Elf_Internal_Sym elfsym;
|
||
unsigned int i;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Shdr *symtab_shndx_hdr;
|
||
Elf_Internal_Shdr *symstrtab_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;
|
||
|
||
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
|
||
|| bed->elf_backend_emit_relocs);
|
||
|
||
finfo.info = info;
|
||
finfo.output_bfd = abfd;
|
||
finfo.symstrtab = _bfd_elf_stringtab_init ();
|
||
if (finfo.symstrtab == NULL)
|
||
return FALSE;
|
||
|
||
if (! dynamic)
|
||
{
|
||
finfo.dynsym_sec = NULL;
|
||
finfo.hash_sec = NULL;
|
||
finfo.symver_sec = NULL;
|
||
}
|
||
else
|
||
{
|
||
finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
|
||
finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
|
||
BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
|
||
finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
|
||
/* Note that it is OK if symver_sec is NULL. */
|
||
}
|
||
|
||
finfo.contents = NULL;
|
||
finfo.external_relocs = NULL;
|
||
finfo.internal_relocs = NULL;
|
||
finfo.external_syms = NULL;
|
||
finfo.locsym_shndx = NULL;
|
||
finfo.internal_syms = NULL;
|
||
finfo.indices = NULL;
|
||
finfo.sections = NULL;
|
||
finfo.symbuf = NULL;
|
||
finfo.symshndxbuf = NULL;
|
||
finfo.symbuf_count = 0;
|
||
finfo.shndxbuf_size = 0;
|
||
|
||
/* 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;
|
||
unsigned int *rel_count1;
|
||
|
||
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 (info->relocatable || info->emitrelocations)
|
||
reloc_count = sec->reloc_count;
|
||
else if (bed->elf_backend_count_relocs)
|
||
{
|
||
Elf_Internal_Rela * relocs;
|
||
|
||
relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
|
||
info->keep_memory);
|
||
|
||
reloc_count = (*bed->elf_backend_count_relocs) (sec, relocs);
|
||
|
||
if (elf_section_data (o)->relocs != relocs)
|
||
free (relocs);
|
||
}
|
||
|
||
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;
|
||
|
||
ext_size = elf_section_data (sec)->rel_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;
|
||
|
||
/* MIPS may have a mix of REL and RELA relocs on sections.
|
||
To support this curious ABI we keep reloc counts in
|
||
elf_section_data too. We must be careful to add the
|
||
relocations from the input section to the right output
|
||
count. FIXME: Get rid of one count. We have
|
||
o->reloc_count == esdo->rel_count + esdo->rel_count2. */
|
||
rel_count1 = &esdo->rel_count;
|
||
if (esdi != NULL)
|
||
{
|
||
bfd_boolean same_size;
|
||
bfd_size_type entsize1;
|
||
|
||
entsize1 = esdi->rel_hdr.sh_entsize;
|
||
BFD_ASSERT (entsize1 == bed->s->sizeof_rel
|
||
|| entsize1 == bed->s->sizeof_rela);
|
||
same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel);
|
||
|
||
if (!same_size)
|
||
rel_count1 = &esdo->rel_count2;
|
||
|
||
if (esdi->rel_hdr2 != NULL)
|
||
{
|
||
bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
|
||
unsigned int alt_count;
|
||
unsigned int *rel_count2;
|
||
|
||
BFD_ASSERT (entsize2 != entsize1
|
||
&& (entsize2 == bed->s->sizeof_rel
|
||
|| entsize2 == bed->s->sizeof_rela));
|
||
|
||
rel_count2 = &esdo->rel_count2;
|
||
if (!same_size)
|
||
rel_count2 = &esdo->rel_count;
|
||
|
||
/* The following is probably too simplistic if the
|
||
backend counts output relocs unusually. */
|
||
BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
|
||
alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
|
||
*rel_count2 += alt_count;
|
||
reloc_count -= alt_count;
|
||
}
|
||
}
|
||
*rel_count1 += 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 ? 0 : 1;
|
||
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)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
if (!(_bfd_elf_link_size_reloc_section
|
||
(abfd, &elf_section_data (o)->rel_hdr, o)))
|
||
goto error_return;
|
||
|
||
if (elf_section_data (o)->rel_hdr2
|
||
&& !(_bfd_elf_link_size_reloc_section
|
||
(abfd, elf_section_data (o)->rel_hdr2, o)))
|
||
goto error_return;
|
||
}
|
||
|
||
/* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
|
||
to count upwards while actually outputting the relocations. */
|
||
elf_section_data (o)->rel_count = 0;
|
||
elf_section_data (o)->rel_count2 = 0;
|
||
}
|
||
|
||
_bfd_elf_assign_file_positions_for_relocs (abfd);
|
||
|
||
/* We have now assigned file positions for all the sections except
|
||
.symtab and .strtab. 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 = 1 << bed->s->log_file_align;
|
||
|
||
off = elf_tdata (abfd)->next_file_pos;
|
||
off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
|
||
|
||
/* Note that at this point elf_tdata (abfd)->next_file_pos 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. */
|
||
|
||
/* Allocate a buffer to hold swapped out symbols. This is to avoid
|
||
continuously seeking to the right position in the file. */
|
||
if (! info->keep_memory || max_sym_count < 20)
|
||
finfo.symbuf_size = 20;
|
||
else
|
||
finfo.symbuf_size = max_sym_count;
|
||
amt = finfo.symbuf_size;
|
||
amt *= bed->s->sizeof_sym;
|
||
finfo.symbuf = bfd_malloc (amt);
|
||
if (finfo.symbuf == NULL)
|
||
goto error_return;
|
||
if (elf_numsections (abfd) > SHN_LORESERVE)
|
||
{
|
||
/* Wild guess at number of output symbols. realloc'd as needed. */
|
||
amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
|
||
finfo.shndxbuf_size = amt;
|
||
amt *= sizeof (Elf_External_Sym_Shndx);
|
||
finfo.symshndxbuf = bfd_zmalloc (amt);
|
||
if (finfo.symshndxbuf == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
/* Start writing out the symbol table. The first symbol is always a
|
||
dummy symbol. */
|
||
if (info->strip != strip_all
|
||
|| emit_relocs)
|
||
{
|
||
elfsym.st_value = 0;
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = 0;
|
||
elfsym.st_other = 0;
|
||
elfsym.st_shndx = SHN_UNDEF;
|
||
if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
|
||
NULL))
|
||
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. */
|
||
if (info->strip != strip_all
|
||
|| emit_relocs)
|
||
{
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
|
||
elfsym.st_other = 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 || o == NULL)
|
||
elfsym.st_value = 0;
|
||
else
|
||
elfsym.st_value = o->vma;
|
||
if (! elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL))
|
||
goto error_return;
|
||
if (i == SHN_LORESERVE - 1)
|
||
i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
|
||
}
|
||
}
|
||
|
||
/* Allocate some memory to hold information read in from the input
|
||
files. */
|
||
if (max_contents_size != 0)
|
||
{
|
||
finfo.contents = bfd_malloc (max_contents_size);
|
||
if (finfo.contents == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_external_reloc_size != 0)
|
||
{
|
||
finfo.external_relocs = bfd_malloc (max_external_reloc_size);
|
||
if (finfo.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);
|
||
finfo.internal_relocs = bfd_malloc (amt);
|
||
if (finfo.internal_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_sym_count != 0)
|
||
{
|
||
amt = max_sym_count * bed->s->sizeof_sym;
|
||
finfo.external_syms = bfd_malloc (amt);
|
||
if (finfo.external_syms == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (Elf_Internal_Sym);
|
||
finfo.internal_syms = bfd_malloc (amt);
|
||
if (finfo.internal_syms == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (long);
|
||
finfo.indices = bfd_malloc (amt);
|
||
if (finfo.indices == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (asection *);
|
||
finfo.sections = bfd_malloc (amt);
|
||
if (finfo.sections == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_sym_shndx_count != 0)
|
||
{
|
||
amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
|
||
finfo.locsym_shndx = bfd_malloc (amt);
|
||
if (finfo.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 *o = sec->map_tail.link_order;
|
||
if (o != NULL)
|
||
size = o->offset + o->size;
|
||
}
|
||
end = sec->vma + size;
|
||
}
|
||
base = elf_hash_table (info)->tls_sec->vma;
|
||
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;
|
||
}
|
||
|
||
/* 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 (&finfo, 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))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 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.finfo = &finfo;
|
||
eoinfo.localsyms = TRUE;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
|
||
&eoinfo);
|
||
if (eoinfo.failed)
|
||
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
|
||
&& finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
|
||
{
|
||
Elf_Internal_Sym sym;
|
||
bfd_byte *dynsym = finfo.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;
|
||
|
||
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;
|
||
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;
|
||
|
||
sym.st_size = e->isym.st_size;
|
||
sym.st_other = e->isym.st_other;
|
||
|
||
/* Copy the internal symbol as is.
|
||
Note that we saved a word of storage and overwrote
|
||
the original st_name with the dynstr_index. */
|
||
sym = e->isym;
|
||
|
||
if (e->isym.st_shndx != SHN_UNDEF
|
||
&& (e->isym.st_shndx < SHN_LORESERVE
|
||
|| e->isym.st_shndx > SHN_HIRESERVE))
|
||
{
|
||
s = bfd_section_from_elf_index (e->input_bfd,
|
||
e->isym.st_shndx);
|
||
|
||
sym.st_shndx =
|
||
elf_section_data (s->output_section)->this_idx;
|
||
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 (finfo.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.finfo = &finfo;
|
||
elf_link_hash_traverse (elf_hash_table (info), 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)
|
||
{
|
||
typedef bfd_boolean (*out_sym_func)
|
||
(void *, const char *, Elf_Internal_Sym *, asection *,
|
||
struct elf_link_hash_entry *);
|
||
|
||
if (! ((*bed->elf_backend_output_arch_syms)
|
||
(abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Flush all symbols to the file. */
|
||
if (! elf_link_flush_output_syms (&finfo, bed))
|
||
return FALSE;
|
||
|
||
/* Now we know the size of the symtab section. */
|
||
off += 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 (finfo.symshndxbuf, amt, abfd) != amt))
|
||
return FALSE;
|
||
}
|
||
|
||
|
||
/* Finish up and write out the symbol string table (.strtab)
|
||
section. */
|
||
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_stringtab_size (finfo.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_tdata (abfd)->next_file_pos = off;
|
||
|
||
if (bfd_get_symcount (abfd) > 0)
|
||
{
|
||
if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Adjust the relocs to have the correct symbol indices. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) == 0)
|
||
continue;
|
||
|
||
elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
|
||
elf_section_data (o)->rel_count,
|
||
elf_section_data (o)->rel_hashes);
|
||
if (elf_section_data (o)->rel_hdr2 != NULL)
|
||
elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
|
||
elf_section_data (o)->rel_count2,
|
||
(elf_section_data (o)->rel_hashes
|
||
+ elf_section_data (o)->rel_count));
|
||
|
||
/* 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_section_by_name (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_val = h->root.u.def.value;
|
||
o = h->root.u.def.section;
|
||
if (o->output_section != NULL)
|
||
dyn.d_un.d_val += (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_val = 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_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;
|
||
}
|
||
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;
|
||
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_val == 0
|
||
|| hdr->sh_addr < dyn.d_un.d_val)
|
||
dyn.d_un.d_val = 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;
|
||
|
||
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 ((elf_section_data (o->output_section)->this_hdr.sh_type
|
||
!= SHT_STRTAB)
|
||
|| strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
|
||
{
|
||
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. */
|
||
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 (info->eh_frame_hdr)
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
|
||
goto error_return;
|
||
}
|
||
|
||
if (finfo.symstrtab != NULL)
|
||
_bfd_stringtab_free (finfo.symstrtab);
|
||
if (finfo.contents != NULL)
|
||
free (finfo.contents);
|
||
if (finfo.external_relocs != NULL)
|
||
free (finfo.external_relocs);
|
||
if (finfo.internal_relocs != NULL)
|
||
free (finfo.internal_relocs);
|
||
if (finfo.external_syms != NULL)
|
||
free (finfo.external_syms);
|
||
if (finfo.locsym_shndx != NULL)
|
||
free (finfo.locsym_shndx);
|
||
if (finfo.internal_syms != NULL)
|
||
free (finfo.internal_syms);
|
||
if (finfo.indices != NULL)
|
||
free (finfo.indices);
|
||
if (finfo.sections != NULL)
|
||
free (finfo.sections);
|
||
if (finfo.symbuf != NULL)
|
||
free (finfo.symbuf);
|
||
if (finfo.symshndxbuf != NULL)
|
||
free (finfo.symshndxbuf);
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0
|
||
&& elf_section_data (o)->rel_hashes != NULL)
|
||
free (elf_section_data (o)->rel_hashes);
|
||
}
|
||
|
||
elf_tdata (abfd)->linker = TRUE;
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (finfo.symstrtab != NULL)
|
||
_bfd_stringtab_free (finfo.symstrtab);
|
||
if (finfo.contents != NULL)
|
||
free (finfo.contents);
|
||
if (finfo.external_relocs != NULL)
|
||
free (finfo.external_relocs);
|
||
if (finfo.internal_relocs != NULL)
|
||
free (finfo.internal_relocs);
|
||
if (finfo.external_syms != NULL)
|
||
free (finfo.external_syms);
|
||
if (finfo.locsym_shndx != NULL)
|
||
free (finfo.locsym_shndx);
|
||
if (finfo.internal_syms != NULL)
|
||
free (finfo.internal_syms);
|
||
if (finfo.indices != NULL)
|
||
free (finfo.indices);
|
||
if (finfo.sections != NULL)
|
||
free (finfo.sections);
|
||
if (finfo.symbuf != NULL)
|
||
free (finfo.symbuf);
|
||
if (finfo.symshndxbuf != NULL)
|
||
free (finfo.symshndxbuf);
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0
|
||
&& elf_section_data (o)->rel_hashes != NULL)
|
||
free (elf_section_data (o)->rel_hashes);
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Garbage collect unused sections. */
|
||
|
||
/* 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. */
|
||
|
||
typedef asection * (*gc_mark_hook_fn)
|
||
(asection *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *, Elf_Internal_Sym *);
|
||
|
||
bfd_boolean
|
||
_bfd_elf_gc_mark (struct bfd_link_info *info,
|
||
asection *sec,
|
||
gc_mark_hook_fn gc_mark_hook)
|
||
{
|
||
bfd_boolean ret;
|
||
bfd_boolean is_eh;
|
||
asection *group_sec;
|
||
|
||
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;
|
||
is_eh = strcmp (sec->name, ".eh_frame") == 0;
|
||
if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
|
||
{
|
||
Elf_Internal_Rela *relstart, *rel, *relend;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
size_t nlocsyms;
|
||
size_t extsymoff;
|
||
bfd *input_bfd = sec->owner;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
|
||
Elf_Internal_Sym *isym = NULL;
|
||
int r_sym_shift;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
|
||
/* Read the local symbols. */
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
nlocsyms = symtab_hdr->sh_size / bed->s->sizeof_sym;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
extsymoff = nlocsyms = symtab_hdr->sh_info;
|
||
|
||
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isym == NULL && nlocsyms != 0)
|
||
{
|
||
isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0,
|
||
NULL, NULL, NULL);
|
||
if (isym == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Read the relocations. */
|
||
relstart = _bfd_elf_link_read_relocs (input_bfd, sec, NULL, NULL,
|
||
info->keep_memory);
|
||
if (relstart == NULL)
|
||
{
|
||
ret = FALSE;
|
||
goto out1;
|
||
}
|
||
relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
|
||
if (bed->s->arch_size == 32)
|
||
r_sym_shift = 8;
|
||
else
|
||
r_sym_shift = 32;
|
||
|
||
for (rel = relstart; rel < relend; rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
asection *rsec;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
r_symndx = rel->r_info >> r_sym_shift;
|
||
if (r_symndx == 0)
|
||
continue;
|
||
|
||
if (r_symndx >= nlocsyms
|
||
|| ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL)
|
||
{
|
||
h = sym_hashes[r_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;
|
||
rsec = (*gc_mark_hook) (sec, info, rel, h, NULL);
|
||
}
|
||
else
|
||
{
|
||
rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]);
|
||
}
|
||
|
||
if (rsec && !rsec->gc_mark)
|
||
{
|
||
if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
|
||
rsec->gc_mark = 1;
|
||
else if (is_eh)
|
||
rsec->gc_mark_from_eh = 1;
|
||
else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
|
||
{
|
||
ret = FALSE;
|
||
goto out2;
|
||
}
|
||
}
|
||
}
|
||
|
||
out2:
|
||
if (elf_section_data (sec)->relocs != relstart)
|
||
free (relstart);
|
||
out1:
|
||
if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym)
|
||
{
|
||
if (! info->keep_memory)
|
||
free (isym);
|
||
else
|
||
symtab_hdr->contents = (unsigned char *) isym;
|
||
}
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* 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->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->gc_mark
|
||
&& !(h->root.u.def.section->owner->flags & DYNAMIC))
|
||
{
|
||
struct elf_gc_sweep_symbol_info *inf = data;
|
||
(*inf->hide_symbol) (inf->info, h, TRUE);
|
||
}
|
||
|
||
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)
|
||
continue;
|
||
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
{
|
||
/* Keep debug and special sections. */
|
||
if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
|
||
|| (o->flags & (SEC_ALLOC | SEC_LOAD)) == 0)
|
||
o->gc_mark = 1;
|
||
|
||
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;
|
||
|
||
/* 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
|
||
&& !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)
|
||
{
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* 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;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* 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;
|
||
|
||
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_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& (h->ref_dynamic
|
||
|| (!info->executable
|
||
&& h->def_regular
|
||
&& ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
|
||
&& ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
|
||
h->root.u.def.section->flags |= SEC_KEEP;
|
||
|
||
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;
|
||
asection * (*gc_mark_hook)
|
||
(asection *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *h, Elf_Internal_Sym *);
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
|
||
if (!bed->can_gc_sections
|
||
|| info->relocatable
|
||
|| info->emitrelocations
|
||
|| !is_elf_hash_table (info->hash))
|
||
{
|
||
(*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
|
||
return TRUE;
|
||
}
|
||
|
||
/* Apply transitive closure to the vtable entry usage info. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_propagate_vtable_entries_used,
|
||
&ok);
|
||
if (!ok)
|
||
return FALSE;
|
||
|
||
/* Kill the vtable relocations that were not used. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_smash_unused_vtentry_relocs,
|
||
&ok);
|
||
if (!ok)
|
||
return FALSE;
|
||
|
||
/* Mark dynamically referenced symbols. */
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
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)
|
||
continue;
|
||
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
if ((o->flags & SEC_KEEP) != 0 && !o->gc_mark)
|
||
if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
|
||
return FALSE;
|
||
}
|
||
|
||
/* ... again for sections marked from eh_frame. */
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
{
|
||
asection *o;
|
||
|
||
if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
/* Keep .gcc_except_table.* if the associated .text.* is
|
||
marked. This isn't very nice, but the proper solution,
|
||
splitting .eh_frame up and using comdat doesn't pan out
|
||
easily due to needing special relocs to handle the
|
||
difference of two symbols in separate sections.
|
||
Don't keep code sections referenced by .eh_frame. */
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
if (!o->gc_mark && o->gc_mark_from_eh && (o->flags & SEC_CODE) == 0)
|
||
{
|
||
if (strncmp (o->name, ".gcc_except_table.", 18) == 0)
|
||
{
|
||
unsigned long len;
|
||
char *fn_name;
|
||
asection *fn_text;
|
||
|
||
len = strlen (o->name + 18) + 1;
|
||
fn_name = bfd_malloc (len + 6);
|
||
if (fn_name == NULL)
|
||
return FALSE;
|
||
memcpy (fn_name, ".text.", 6);
|
||
memcpy (fn_name + 6, o->name + 18, len);
|
||
fn_text = bfd_get_section_by_name (sub, fn_name);
|
||
free (fn_name);
|
||
if (fn_text == NULL || !fn_text->gc_mark)
|
||
continue;
|
||
}
|
||
|
||
/* If not using specially named exception table section,
|
||
then keep whatever we are using. */
|
||
if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* ... 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 = 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 = 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_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_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;
|
||
}
|
||
|
||
struct alloc_got_off_arg {
|
||
bfd_vma gotoff;
|
||
unsigned int got_elt_size;
|
||
};
|
||
|
||
/* 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 = arg;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (h->got.refcount > 0)
|
||
{
|
||
h->got.offset = gofarg->gotoff;
|
||
gofarg->gotoff += gofarg->got_elt_size;
|
||
}
|
||
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;
|
||
unsigned int got_elt_size = bed->s->arch_size / 8;
|
||
struct alloc_got_off_arg gofarg;
|
||
|
||
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 += got_elt_size;
|
||
}
|
||
else
|
||
local_got[j] = (bfd_vma) -1;
|
||
}
|
||
}
|
||
|
||
/* Then the global .got entries. .plt refcounts are handled by
|
||
adjust_dynamic_symbol */
|
||
gofarg.gotoff = gotoff;
|
||
gofarg.got_elt_size = got_elt_size;
|
||
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 = 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 == SHN_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)
|
||
&& elf_discarded_section (h->root.u.def.section))
|
||
return TRUE;
|
||
else
|
||
return FALSE;
|
||
}
|
||
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];
|
||
if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
|
||
{
|
||
isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
|
||
if (isec != NULL && elf_discarded_section (isec))
|
||
return TRUE;
|
||
}
|
||
}
|
||
return FALSE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
/* Discard unneeded references to discarded sections.
|
||
Returns TRUE if any section's size was changed. */
|
||
/* This function assumes that the relocations are in sorted order,
|
||
which is true for all known assemblers. */
|
||
|
||
bfd_boolean
|
||
bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf_reloc_cookie cookie;
|
||
asection *stab, *eh;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
const struct elf_backend_data *bed;
|
||
bfd *abfd;
|
||
unsigned int count;
|
||
bfd_boolean ret = FALSE;
|
||
|
||
if (info->traditional_format
|
||
|| !is_elf_hash_table (info->hash))
|
||
return FALSE;
|
||
|
||
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
|
||
{
|
||
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
if ((abfd->flags & DYNAMIC) != 0)
|
||
continue;
|
||
|
||
eh = bfd_get_section_by_name (abfd, ".eh_frame");
|
||
if (info->relocatable
|
||
|| (eh != NULL
|
||
&& (eh->size == 0
|
||
|| bfd_is_abs_section (eh->output_section))))
|
||
eh = NULL;
|
||
|
||
stab = bfd_get_section_by_name (abfd, ".stab");
|
||
if (stab != NULL
|
||
&& (stab->size == 0
|
||
|| bfd_is_abs_section (stab->output_section)
|
||
|| stab->sec_info_type != ELF_INFO_TYPE_STABS))
|
||
stab = NULL;
|
||
|
||
if (stab == NULL
|
||
&& eh == NULL
|
||
&& bed->elf_backend_discard_info == NULL)
|
||
continue;
|
||
|
||
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)
|
||
return FALSE;
|
||
}
|
||
|
||
if (stab != NULL)
|
||
{
|
||
cookie.rels = NULL;
|
||
count = stab->reloc_count;
|
||
if (count != 0)
|
||
cookie.rels = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL,
|
||
info->keep_memory);
|
||
if (cookie.rels != NULL)
|
||
{
|
||
cookie.rel = cookie.rels;
|
||
cookie.relend = cookie.rels;
|
||
cookie.relend += count * bed->s->int_rels_per_ext_rel;
|
||
if (_bfd_discard_section_stabs (abfd, stab,
|
||
elf_section_data (stab)->sec_info,
|
||
bfd_elf_reloc_symbol_deleted_p,
|
||
&cookie))
|
||
ret = TRUE;
|
||
if (elf_section_data (stab)->relocs != cookie.rels)
|
||
free (cookie.rels);
|
||
}
|
||
}
|
||
|
||
if (eh != NULL)
|
||
{
|
||
cookie.rels = NULL;
|
||
count = eh->reloc_count;
|
||
if (count != 0)
|
||
cookie.rels = _bfd_elf_link_read_relocs (abfd, eh, NULL, NULL,
|
||
info->keep_memory);
|
||
cookie.rel = cookie.rels;
|
||
cookie.relend = cookie.rels;
|
||
if (cookie.rels != NULL)
|
||
cookie.relend += count * bed->s->int_rels_per_ext_rel;
|
||
|
||
if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
|
||
bfd_elf_reloc_symbol_deleted_p,
|
||
&cookie))
|
||
ret = TRUE;
|
||
|
||
if (cookie.rels != NULL
|
||
&& elf_section_data (eh)->relocs != cookie.rels)
|
||
free (cookie.rels);
|
||
}
|
||
|
||
if (bed->elf_backend_discard_info != NULL
|
||
&& (*bed->elf_backend_discard_info) (abfd, &cookie, info))
|
||
ret = TRUE;
|
||
|
||
if (cookie.locsyms != NULL
|
||
&& symtab_hdr->contents != (unsigned char *) cookie.locsyms)
|
||
{
|
||
if (! info->keep_memory)
|
||
free (cookie.locsyms);
|
||
else
|
||
symtab_hdr->contents = (unsigned char *) cookie.locsyms;
|
||
}
|
||
}
|
||
|
||
if (info->eh_frame_hdr
|
||
&& !info->relocatable
|
||
&& _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
|
||
ret = TRUE;
|
||
|
||
return ret;
|
||
}
|
||
|
||
void
|
||
_bfd_elf_section_already_linked (bfd *abfd, struct bfd_section * sec)
|
||
{
|
||
flagword flags;
|
||
const char *name, *p;
|
||
struct bfd_section_already_linked *l;
|
||
struct bfd_section_already_linked_hash_entry *already_linked_list;
|
||
asection *group;
|
||
|
||
/* A single member comdat group section may be discarded by a
|
||
linkonce section. See below. */
|
||
if (sec->output_section == bfd_abs_section_ptr)
|
||
return;
|
||
|
||
flags = sec->flags;
|
||
|
||
/* Check if it belongs to a section group. */
|
||
group = elf_sec_group (sec);
|
||
|
||
/* Return if it isn't a linkonce section nor a member of a group. A
|
||
comdat group section also has SEC_LINK_ONCE set. */
|
||
if ((flags & SEC_LINK_ONCE) == 0 && group == NULL)
|
||
return;
|
||
|
||
if (group)
|
||
{
|
||
/* If this is the member of a single member comdat group, check if
|
||
the group should be discarded. */
|
||
if (elf_next_in_group (sec) == sec
|
||
&& (group->flags & SEC_LINK_ONCE) != 0)
|
||
sec = group;
|
||
else
|
||
return;
|
||
}
|
||
|
||
/* FIXME: When doing a relocatable link, we may have trouble
|
||
copying relocations in other sections that refer to local symbols
|
||
in the section being discarded. Those relocations will have to
|
||
be converted somehow; as of this writing I'm not sure that any of
|
||
the backends handle that correctly.
|
||
|
||
It is tempting to instead not discard link once sections when
|
||
doing a relocatable link (technically, they should be discarded
|
||
whenever we are building constructors). However, that fails,
|
||
because the linker winds up combining all the link once sections
|
||
into a single large link once section, which defeats the purpose
|
||
of having link once sections in the first place.
|
||
|
||
Also, not merging link once sections in a relocatable link
|
||
causes trouble for MIPS ELF, which relies on link once semantics
|
||
to handle the .reginfo section correctly. */
|
||
|
||
name = bfd_get_section_name (abfd, sec);
|
||
|
||
if (strncmp (name, ".gnu.linkonce.", sizeof (".gnu.linkonce.") - 1) == 0
|
||
&& (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
|
||
p++;
|
||
else
|
||
p = name;
|
||
|
||
already_linked_list = bfd_section_already_linked_table_lookup (p);
|
||
|
||
for (l = already_linked_list->entry; l != NULL; l = l->next)
|
||
{
|
||
/* We may have 3 different sections on the list: group section,
|
||
comdat section and linkonce section. SEC may be a linkonce or
|
||
group section. We match a group section with a group section,
|
||
a linkonce section with a linkonce section, and ignore comdat
|
||
section. */
|
||
if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
|
||
&& strcmp (name, l->sec->name) == 0
|
||
&& bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
|
||
{
|
||
/* The section has already been linked. See if we should
|
||
issue a warning. */
|
||
switch (flags & SEC_LINK_DUPLICATES)
|
||
{
|
||
default:
|
||
abort ();
|
||
|
||
case SEC_LINK_DUPLICATES_DISCARD:
|
||
break;
|
||
|
||
case SEC_LINK_DUPLICATES_ONE_ONLY:
|
||
(*_bfd_error_handler)
|
||
(_("%B: ignoring duplicate section `%A'"),
|
||
abfd, sec);
|
||
break;
|
||
|
||
case SEC_LINK_DUPLICATES_SAME_SIZE:
|
||
if (sec->size != l->sec->size)
|
||
(*_bfd_error_handler)
|
||
(_("%B: duplicate section `%A' has different size"),
|
||
abfd, sec);
|
||
break;
|
||
|
||
case SEC_LINK_DUPLICATES_SAME_CONTENTS:
|
||
if (sec->size != l->sec->size)
|
||
(*_bfd_error_handler)
|
||
(_("%B: duplicate section `%A' has different size"),
|
||
abfd, sec);
|
||
else if (sec->size != 0)
|
||
{
|
||
bfd_byte *sec_contents, *l_sec_contents;
|
||
|
||
if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents))
|
||
(*_bfd_error_handler)
|
||
(_("%B: warning: could not read contents of section `%A'"),
|
||
abfd, sec);
|
||
else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
|
||
&l_sec_contents))
|
||
(*_bfd_error_handler)
|
||
(_("%B: warning: could not read contents of section `%A'"),
|
||
l->sec->owner, l->sec);
|
||
else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
|
||
(*_bfd_error_handler)
|
||
(_("%B: warning: duplicate section `%A' has different contents"),
|
||
abfd, sec);
|
||
|
||
if (sec_contents)
|
||
free (sec_contents);
|
||
if (l_sec_contents)
|
||
free (l_sec_contents);
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* Set the output_section field so that lang_add_section
|
||
does not create a lang_input_section structure for this
|
||
section. Since there might be a symbol in the section
|
||
being discarded, we must retain a pointer to the section
|
||
which we are really going to use. */
|
||
sec->output_section = bfd_abs_section_ptr;
|
||
sec->kept_section = l->sec;
|
||
|
||
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;
|
||
}
|
||
}
|
||
|
||
if (group)
|
||
{
|
||
/* If this is the member of a single member comdat group and the
|
||
group hasn't be discarded, we check if it matches a linkonce
|
||
section. We only record the discarded comdat group. Otherwise
|
||
the undiscarded group will be discarded incorrectly later since
|
||
itself has been recorded. */
|
||
for (l = already_linked_list->entry; l != NULL; l = l->next)
|
||
if ((l->sec->flags & SEC_GROUP) == 0
|
||
&& bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL
|
||
&& bfd_elf_match_symbols_in_sections (l->sec,
|
||
elf_next_in_group (sec)))
|
||
{
|
||
elf_next_in_group (sec)->output_section = bfd_abs_section_ptr;
|
||
elf_next_in_group (sec)->kept_section = l->sec;
|
||
group->output_section = bfd_abs_section_ptr;
|
||
break;
|
||
}
|
||
if (l == NULL)
|
||
return;
|
||
}
|
||
else
|
||
/* There is no direct match. But for linkonce section, we should
|
||
check if there is a match with comdat group member. We always
|
||
record the linkonce section, discarded or not. */
|
||
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))
|
||
{
|
||
sec->output_section = bfd_abs_section_ptr;
|
||
sec->kept_section = l->sec;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* This is the first section with this name. Record it. */
|
||
bfd_section_already_linked_table_insert (already_linked_list, sec);
|
||
}
|
||
|
||
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;
|
||
}
|