3819 lines
118 KiB
C
3819 lines
118 KiB
C
/* PowerPC-specific support for 32-bit ELF
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Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This file is based on a preliminary PowerPC ELF ABI. The
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information may not match the final PowerPC ELF ABI. It includes
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suggestions from the in-progress Embedded PowerPC ABI, and that
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information may also not match. */
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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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#include "elf-bfd.h"
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#include "elf/ppc.h"
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#define USE_RELA /* we want RELA relocations, not REL */
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static reloc_howto_type *ppc_elf_reloc_type_lookup
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PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
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static void ppc_elf_info_to_howto
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PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rela *dst));
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static void ppc_elf_howto_init PARAMS ((void));
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static int ppc_elf_sort_rela PARAMS ((const PTR, const PTR));
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static boolean ppc_elf_relax_section
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PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
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static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword));
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static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
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static int ppc_elf_additional_program_headers PARAMS ((bfd *));
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static boolean ppc_elf_modify_segment_map PARAMS ((bfd *));
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static asection *ppc_elf_create_got
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean ppc_elf_create_dynamic_sections
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean ppc_elf_section_from_shdr PARAMS ((bfd *,
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Elf32_Internal_Shdr *,
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const char *));
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static boolean ppc_elf_fake_sections
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PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
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static elf_linker_section_t *ppc_elf_create_linker_section
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PARAMS ((bfd *abfd,
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struct bfd_link_info *info,
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enum elf_linker_section_enum));
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static boolean ppc_elf_check_relocs PARAMS ((bfd *,
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struct bfd_link_info *,
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asection *,
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const Elf_Internal_Rela *));
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static asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd,
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struct bfd_link_info *info,
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Elf_Internal_Rela *rel,
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struct elf_link_hash_entry *h,
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Elf_Internal_Sym *sym));
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static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd,
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struct bfd_link_info *info,
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asection *sec,
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const Elf_Internal_Rela *relocs));
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static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *,
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struct elf_link_hash_entry *));
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static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
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static boolean ppc_elf_relocate_section PARAMS ((bfd *,
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struct bfd_link_info *info,
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bfd *,
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asection *,
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bfd_byte *,
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Elf_Internal_Rela *relocs,
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Elf_Internal_Sym *local_syms,
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asection **));
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static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *,
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struct bfd_link_info *,
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const Elf_Internal_Sym *,
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const char **,
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flagword *,
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asection **,
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bfd_vma *));
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static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *,
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struct bfd_link_info *,
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struct elf_link_hash_entry *,
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Elf_Internal_Sym *));
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static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
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static enum elf_reloc_type_class ppc_elf_reloc_type_class
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PARAMS ((const Elf_Internal_Rela *));
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static boolean ppc_elf_grok_prstatus
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PARAMS ((bfd *abfd, Elf_Internal_Note *note));
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static boolean ppc_elf_grok_psinfo
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PARAMS ((bfd *abfd, Elf_Internal_Note *note));
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#define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */
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#define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */
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#define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */
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/* The name of the dynamic interpreter. This is put in the .interp
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section. */
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#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
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/* The size in bytes of an entry in the procedure linkage table. */
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#define PLT_ENTRY_SIZE 12
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/* The initial size of the plt reserved for the dynamic linker. */
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#define PLT_INITIAL_ENTRY_SIZE 72
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/* The size of the gap between entries in the PLT. */
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#define PLT_SLOT_SIZE 8
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/* The number of single-slot PLT entries (the rest use two slots). */
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#define PLT_NUM_SINGLE_ENTRIES 8192
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/* Will references to this symbol always reference the symbol
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in this object? */
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#define SYMBOL_REFERENCES_LOCAL(INFO, H) \
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((! INFO->shared \
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|| INFO->symbolic \
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|| H->dynindx == -1 \
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|| ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
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|| ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
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&& (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
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/* Will _calls_ to this symbol always call the version in this object? */
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#define SYMBOL_CALLS_LOCAL(INFO, H) \
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((! INFO->shared \
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|| INFO->symbolic \
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|| H->dynindx == -1 \
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|| ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
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&& (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
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static reloc_howto_type *ppc_elf_howto_table[(int) R_PPC_max];
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static reloc_howto_type ppc_elf_howto_raw[] = {
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/* This reloc does nothing. */
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HOWTO (R_PPC_NONE, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_NONE", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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false), /* pcrel_offset */
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/* A standard 32 bit relocation. */
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HOWTO (R_PPC_ADDR32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR32", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* An absolute 26 bit branch; the lower two bits must be zero.
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FIXME: we don't check that, we just clear them. */
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HOWTO (R_PPC_ADDR24, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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26, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR24", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0x3fffffc, /* dst_mask */
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false), /* pcrel_offset */
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/* A standard 16 bit relocation. */
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HOWTO (R_PPC_ADDR16, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR16", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 16 bit relocation without overflow. */
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HOWTO (R_PPC_ADDR16_LO, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR16_LO", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* The high order 16 bits of an address. */
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HOWTO (R_PPC_ADDR16_HI, /* type */
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16, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR16_HI", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* The high order 16 bits of an address, plus 1 if the contents of
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the low 16 bits, treated as a signed number, is negative. */
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HOWTO (R_PPC_ADDR16_HA, /* type */
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16, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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ppc_elf_addr16_ha_reloc, /* special_function */
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"R_PPC_ADDR16_HA", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* An absolute 16 bit branch; the lower two bits must be zero.
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FIXME: we don't check that, we just clear them. */
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HOWTO (R_PPC_ADDR14, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR14", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xfffc, /* dst_mask */
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false), /* pcrel_offset */
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/* An absolute 16 bit branch, for which bit 10 should be set to
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indicate that the branch is expected to be taken. The lower two
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bits must be zero. */
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HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR14_BRTAKEN",/* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xfffc, /* dst_mask */
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false), /* pcrel_offset */
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/* An absolute 16 bit branch, for which bit 10 should be set to
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indicate that the branch is not expected to be taken. The lower
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two bits must be zero. */
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HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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||
bfd_elf_generic_reloc, /* special_function */
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"R_PPC_ADDR14_BRNTAKEN",/* name */
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false, /* partial_inplace */
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||
0, /* src_mask */
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||
0xfffc, /* dst_mask */
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false), /* pcrel_offset */
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||
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/* A relative 26 bit branch; the lower two bits must be zero. */
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HOWTO (R_PPC_REL24, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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26, /* bitsize */
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true, /* pc_relative */
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||
0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PPC_REL24", /* name */
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||
false, /* partial_inplace */
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||
0, /* src_mask */
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||
0x3fffffc, /* dst_mask */
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||
true), /* pcrel_offset */
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||
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/* A relative 16 bit branch; the lower two bits must be zero. */
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||
HOWTO (R_PPC_REL14, /* type */
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||
0, /* rightshift */
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||
2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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||
true, /* pc_relative */
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||
0, /* bitpos */
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||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
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||
"R_PPC_REL14", /* name */
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||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xfffc, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* A relative 16 bit branch. Bit 10 should be set to indicate that
|
||
the branch is expected to be taken. The lower two bits must be
|
||
zero. */
|
||
HOWTO (R_PPC_REL14_BRTAKEN, /* type */
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||
0, /* rightshift */
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||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_REL14_BRTAKEN", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xfffc, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* A relative 16 bit branch. Bit 10 should be set to indicate that
|
||
the branch is not expected to be taken. The lower two bits must
|
||
be zero. */
|
||
HOWTO (R_PPC_REL14_BRNTAKEN, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_REL14_BRNTAKEN",/* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xfffc, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16, but referring to the GOT table entry for the
|
||
symbol. */
|
||
HOWTO (R_PPC_GOT16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_GOT16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
|
||
the symbol. */
|
||
HOWTO (R_PPC_GOT16_LO, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_GOT16_LO", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
|
||
the symbol. */
|
||
HOWTO (R_PPC_GOT16_HI, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_GOT16_HI", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
|
||
the symbol. */
|
||
HOWTO (R_PPC_GOT16_HA, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
ppc_elf_addr16_ha_reloc, /* special_function */
|
||
"R_PPC_GOT16_HA", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_REL24, but referring to the procedure linkage table
|
||
entry for the symbol. */
|
||
HOWTO (R_PPC_PLTREL24, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
26, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_PLTREL24", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0x3fffffc, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* This is used only by the dynamic linker. The symbol should exist
|
||
both in the object being run and in some shared library. The
|
||
dynamic linker copies the data addressed by the symbol from the
|
||
shared library into the object, because the object being
|
||
run has to have the data at some particular address. */
|
||
HOWTO (R_PPC_COPY, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_COPY", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR32, but used when setting global offset table
|
||
entries. */
|
||
HOWTO (R_PPC_GLOB_DAT, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_GLOB_DAT", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Marks a procedure linkage table entry for a symbol. */
|
||
HOWTO (R_PPC_JMP_SLOT, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_JMP_SLOT", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Used only by the dynamic linker. When the object is run, this
|
||
longword is set to the load address of the object, plus the
|
||
addend. */
|
||
HOWTO (R_PPC_RELATIVE, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_RELATIVE", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_REL24, but uses the value of the symbol within the
|
||
object rather than the final value. Normally used for
|
||
_GLOBAL_OFFSET_TABLE_. */
|
||
HOWTO (R_PPC_LOCAL24PC, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
26, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_LOCAL24PC", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0x3fffffc, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR32, but may be unaligned. */
|
||
HOWTO (R_PPC_UADDR32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_UADDR32", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16, but may be unaligned. */
|
||
HOWTO (R_PPC_UADDR16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_UADDR16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 32-bit PC relative */
|
||
HOWTO (R_PPC_REL32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_REL32", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* 32-bit relocation to the symbol's procedure linkage table.
|
||
FIXME: not supported. */
|
||
HOWTO (R_PPC_PLT32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_PLT32", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 32-bit PC relative relocation to the symbol's procedure linkage table.
|
||
FIXME: not supported. */
|
||
HOWTO (R_PPC_PLTREL32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_PLTREL32", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
|
||
the symbol. */
|
||
HOWTO (R_PPC_PLT16_LO, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_PLT16_LO", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
|
||
the symbol. */
|
||
HOWTO (R_PPC_PLT16_HI, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_PLT16_HI", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
|
||
the symbol. */
|
||
HOWTO (R_PPC_PLT16_HA, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
ppc_elf_addr16_ha_reloc, /* special_function */
|
||
"R_PPC_PLT16_HA", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
|
||
small data items. */
|
||
HOWTO (R_PPC_SDAREL16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_SDAREL16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16-bit section relative relocation. */
|
||
HOWTO (R_PPC_SECTOFF, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_SECTOFF", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16-bit lower half section relative relocation. */
|
||
HOWTO (R_PPC_SECTOFF_LO, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_SECTOFF_LO", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16-bit upper half section relative relocation. */
|
||
HOWTO (R_PPC_SECTOFF_HI, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_SECTOFF_HI", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16-bit upper half adjusted section relative relocation. */
|
||
HOWTO (R_PPC_SECTOFF_HA, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
ppc_elf_addr16_ha_reloc, /* special_function */
|
||
"R_PPC_SECTOFF_HA", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* The remaining relocs are from the Embedded ELF ABI, and are not
|
||
in the SVR4 ELF ABI. */
|
||
|
||
/* 32 bit value resulting from the addend minus the symbol */
|
||
HOWTO (R_PPC_EMB_NADDR32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_NADDR32", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit value resulting from the addend minus the symbol */
|
||
HOWTO (R_PPC_EMB_NADDR16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_NADDR16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit value resulting from the addend minus the symbol */
|
||
HOWTO (R_PPC_EMB_NADDR16_LO, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont,/* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_ADDR16_LO", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* The high order 16 bits of the addend minus the symbol */
|
||
HOWTO (R_PPC_EMB_NADDR16_HI, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_NADDR16_HI", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* The high order 16 bits of the result of the addend minus the address,
|
||
plus 1 if the contents of the low 16 bits, treated as a signed number,
|
||
is negative. */
|
||
HOWTO (R_PPC_EMB_NADDR16_HA, /* type */
|
||
16, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
ppc_elf_addr16_ha_reloc, /* special_function */
|
||
"R_PPC_EMB_NADDR16_HA", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit value resulting from allocating a 4 byte word to hold an
|
||
address in the .sdata section, and returning the offset from
|
||
_SDA_BASE_ for that relocation */
|
||
HOWTO (R_PPC_EMB_SDAI16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_SDAI16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* 16 bit value resulting from allocating a 4 byte word to hold an
|
||
address in the .sdata2 section, and returning the offset from
|
||
_SDA2_BASE_ for that relocation */
|
||
HOWTO (R_PPC_EMB_SDA2I16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_SDA2I16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
|
||
small data items. */
|
||
HOWTO (R_PPC_EMB_SDA2REL, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_SDA2REL", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
|
||
signed offset from the appropriate base, and filling in the register
|
||
field with the appropriate register (0, 2, or 13). */
|
||
HOWTO (R_PPC_EMB_SDA21, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_SDA21", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Relocation not handled: R_PPC_EMB_MRKREF */
|
||
/* Relocation not handled: R_PPC_EMB_RELSEC16 */
|
||
/* Relocation not handled: R_PPC_EMB_RELST_LO */
|
||
/* Relocation not handled: R_PPC_EMB_RELST_HI */
|
||
/* Relocation not handled: R_PPC_EMB_RELST_HA */
|
||
/* Relocation not handled: R_PPC_EMB_BIT_FLD */
|
||
|
||
/* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
|
||
in the 16 bit signed offset from the appropriate base, and filling in the
|
||
register field with the appropriate register (0, 2, or 13). */
|
||
HOWTO (R_PPC_EMB_RELSDA, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_EMB_RELSDA", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* GNU extension to record C++ vtable hierarchy */
|
||
HOWTO (R_PPC_GNU_VTINHERIT, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
NULL, /* special_function */
|
||
"R_PPC_GNU_VTINHERIT", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* GNU extension to record C++ vtable member usage */
|
||
HOWTO (R_PPC_GNU_VTENTRY, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
NULL, /* special_function */
|
||
"R_PPC_GNU_VTENTRY", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* Phony reloc to handle AIX style TOC entries */
|
||
HOWTO (R_PPC_TOC16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_PPC_TOC16", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
};
|
||
|
||
/* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
|
||
|
||
static void
|
||
ppc_elf_howto_init ()
|
||
{
|
||
unsigned int i, type;
|
||
|
||
for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++)
|
||
{
|
||
type = ppc_elf_howto_raw[i].type;
|
||
BFD_ASSERT (type < sizeof (ppc_elf_howto_table) / sizeof (ppc_elf_howto_table[0]));
|
||
ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i];
|
||
}
|
||
}
|
||
|
||
/* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
|
||
|
||
The MPC860, revision C0 or earlier contains a bug in the die.
|
||
If all of the following conditions are true, the next instruction
|
||
to be executed *may* be treated as a no-op.
|
||
1/ A forward branch is executed.
|
||
2/ The branch is predicted as not taken.
|
||
3/ The branch is taken.
|
||
4/ The branch is located in the last 5 words of a page.
|
||
(The EOP limit is 5 by default but may be specified as any value from 1-10.)
|
||
|
||
Our software solution is to detect these problematic branches in a
|
||
linker pass and modify them as follows:
|
||
1/ Unconditional branches - Since these are always predicted taken,
|
||
there is no problem and no action is required.
|
||
2/ Conditional backward branches - No problem, no action required.
|
||
3/ Conditional forward branches - Ensure that the "inverse prediction
|
||
bit" is set (ensure it is predicted taken).
|
||
4/ Conditional register branches - Ensure that the "y bit" is set
|
||
(ensure it is predicted taken).
|
||
*/
|
||
|
||
/* Sort sections by address. */
|
||
|
||
static int
|
||
ppc_elf_sort_rela (arg1, arg2)
|
||
const PTR arg1;
|
||
const PTR arg2;
|
||
{
|
||
const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1;
|
||
const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2;
|
||
|
||
/* Sort by offset. */
|
||
return ((*rela1)->r_offset - (*rela2)->r_offset);
|
||
}
|
||
|
||
static boolean
|
||
ppc_elf_relax_section (abfd, isec, link_info, again)
|
||
bfd *abfd;
|
||
asection *isec;
|
||
struct bfd_link_info *link_info;
|
||
boolean *again;
|
||
{
|
||
#define PAGESIZE 0x1000
|
||
|
||
bfd_byte *contents = NULL;
|
||
bfd_byte *free_contents = NULL;
|
||
Elf_Internal_Rela *internal_relocs = NULL;
|
||
Elf_Internal_Rela *free_relocs = NULL;
|
||
Elf_Internal_Rela **rela_comb = NULL;
|
||
int comb_curr, comb_count;
|
||
|
||
/* We never have to do this more than once per input section. */
|
||
*again = false;
|
||
|
||
/* If needed, initialize this section's cooked size. */
|
||
if (isec->_cooked_size == 0)
|
||
isec->_cooked_size = isec->_raw_size;
|
||
|
||
/* We're only interested in text sections which overlap the
|
||
troublesome area at the end of a page. */
|
||
if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size)
|
||
{
|
||
bfd_vma dot, end_page, end_section;
|
||
boolean section_modified;
|
||
|
||
/* Get the section contents. */
|
||
/* Get cached copy if it exists. */
|
||
if (elf_section_data (isec)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (isec)->this_hdr.contents;
|
||
else
|
||
{
|
||
/* Go get them off disk. */
|
||
contents = (bfd_byte *) bfd_malloc (isec->_raw_size);
|
||
if (contents == NULL)
|
||
goto error_return;
|
||
free_contents = contents;
|
||
|
||
if (! bfd_get_section_contents (abfd, isec, contents,
|
||
(file_ptr) 0, isec->_raw_size))
|
||
goto error_return;
|
||
}
|
||
|
||
comb_curr = 0;
|
||
comb_count = 0;
|
||
if (isec->reloc_count)
|
||
{
|
||
unsigned n;
|
||
bfd_size_type amt;
|
||
|
||
/* Get a copy of the native relocations. */
|
||
internal_relocs = _bfd_elf32_link_read_relocs (
|
||
abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
|
||
link_info->keep_memory);
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
if (! link_info->keep_memory)
|
||
free_relocs = internal_relocs;
|
||
|
||
/* Setup a faster access method for the reloc info we need. */
|
||
amt = isec->reloc_count;
|
||
amt *= sizeof (Elf_Internal_Rela*);
|
||
rela_comb = (Elf_Internal_Rela**) bfd_malloc (amt);
|
||
if (rela_comb == NULL)
|
||
goto error_return;
|
||
for (n = 0; n < isec->reloc_count; ++n)
|
||
{
|
||
long r_type;
|
||
|
||
r_type = ELF32_R_TYPE (internal_relocs[n].r_info);
|
||
if (r_type < 0 || r_type >= (int) R_PPC_max)
|
||
goto error_return;
|
||
|
||
/* Prologue constants are sometimes present in the ".text"
|
||
sections and they can be identified by their associated relocation.
|
||
We don't want to process those words and some others which
|
||
can also be identified by their relocations. However, not all
|
||
conditional branches will have a relocation so we will
|
||
only ignore words that 1) have a reloc, and 2) the reloc
|
||
is not applicable to a conditional branch.
|
||
The array rela_comb is built here for use in the EOP scan loop. */
|
||
switch (r_type)
|
||
{
|
||
case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */
|
||
case R_PPC_REL14: /* relative cond. br. */
|
||
case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */
|
||
/* We should check the instruction. */
|
||
break;
|
||
default:
|
||
/* The word is not a conditional branch - ignore it. */
|
||
rela_comb[comb_count++] = &internal_relocs[n];
|
||
break;
|
||
}
|
||
}
|
||
if (comb_count > 1)
|
||
qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela);
|
||
}
|
||
|
||
/* Enumerate each EOP region that overlaps this section. */
|
||
end_section = isec->vma + isec->_cooked_size;
|
||
dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1;
|
||
dot -= link_info->mpc860c0;
|
||
section_modified = false;
|
||
if (dot < isec->vma) /* Increment the start position if this section */
|
||
dot = isec->vma; /* begins in the middle of its first EOP region. */
|
||
for (;
|
||
dot < end_section;
|
||
dot += PAGESIZE, end_page += PAGESIZE)
|
||
{
|
||
|
||
/* Check each word in this EOP region. */
|
||
for (; dot < end_page; dot += 4)
|
||
{
|
||
bfd_vma isec_offset;
|
||
unsigned long insn;
|
||
boolean skip, modified;
|
||
|
||
/* Don't process this word if there is a relocation for it and
|
||
the relocation indicates the word is not a conditional branch. */
|
||
skip = false;
|
||
isec_offset = dot - isec->vma;
|
||
for (; comb_curr<comb_count; ++comb_curr)
|
||
{
|
||
bfd_vma r_offset;
|
||
|
||
r_offset = rela_comb[comb_curr]->r_offset;
|
||
if (r_offset >= isec_offset)
|
||
{
|
||
if (r_offset == isec_offset) skip = true;
|
||
break;
|
||
}
|
||
}
|
||
if (skip) continue;
|
||
|
||
/* Check the current word for a problematic conditional branch. */
|
||
#define BO0(insn) ((insn) & 0x02000000)
|
||
#define BO2(insn) ((insn) & 0x00800000)
|
||
#define BO4(insn) ((insn) & 0x00200000)
|
||
insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset);
|
||
modified = false;
|
||
if ((insn & 0xFc000000) == 0x40000000)
|
||
{
|
||
/* Instruction is BCx */
|
||
if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
|
||
{
|
||
bfd_vma target;
|
||
/* This branch is predicted as "normal".
|
||
If this is a forward branch, it is problematic. */
|
||
|
||
target = insn & 0x0000Fffc; /*extract*/
|
||
target = (target ^ 0x8000) - 0x8000; /*sign extend*/
|
||
if ((insn & 0x00000002) == 0)
|
||
target += dot; /*convert to abs*/
|
||
if (target > dot)
|
||
{
|
||
insn |= 0x00200000; /* set the prediction bit */
|
||
modified = true;
|
||
}
|
||
}
|
||
}
|
||
else if ((insn & 0xFc00Fffe) == 0x4c000420)
|
||
{
|
||
/* Instruction is BCCTRx */
|
||
if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
|
||
{
|
||
/* This branch is predicted as not-taken.
|
||
If this is a forward branch, it is problematic.
|
||
Since we can't tell statically if it will branch forward,
|
||
always set the prediction bit. */
|
||
insn |= 0x00200000; /* set the prediction bit */
|
||
modified = true;
|
||
}
|
||
}
|
||
else if ((insn & 0xFc00Fffe) == 0x4c000020)
|
||
{
|
||
/* Instruction is BCLRx */
|
||
if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
|
||
{
|
||
/* This branch is predicted as not-taken.
|
||
If this is a forward branch, it is problematic.
|
||
Since we can't tell statically if it will branch forward,
|
||
always set the prediction bit. */
|
||
insn |= 0x00200000; /* set the prediction bit */
|
||
modified = true;
|
||
}
|
||
}
|
||
#undef BO0
|
||
#undef BO2
|
||
#undef BO4
|
||
if (modified)
|
||
{
|
||
bfd_put_32 (abfd, (bfd_vma) insn, contents + isec_offset);
|
||
section_modified = true;
|
||
}
|
||
}
|
||
}
|
||
if (section_modified)
|
||
{
|
||
elf_section_data (isec)->this_hdr.contents = contents;
|
||
free_contents = NULL;
|
||
}
|
||
}
|
||
|
||
if (rela_comb != NULL)
|
||
{
|
||
free (rela_comb);
|
||
rela_comb = NULL;
|
||
}
|
||
|
||
if (free_relocs != NULL)
|
||
{
|
||
free (free_relocs);
|
||
free_relocs = NULL;
|
||
}
|
||
|
||
if (free_contents != NULL)
|
||
{
|
||
if (! link_info->keep_memory)
|
||
free (free_contents);
|
||
else
|
||
{
|
||
/* Cache the section contents for elf_link_input_bfd. */
|
||
elf_section_data (isec)->this_hdr.contents = contents;
|
||
}
|
||
free_contents = NULL;
|
||
}
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (rela_comb != NULL)
|
||
free (rela_comb);
|
||
if (free_relocs != NULL)
|
||
free (free_relocs);
|
||
if (free_contents != NULL)
|
||
free (free_contents);
|
||
return false;
|
||
}
|
||
|
||
static reloc_howto_type *
|
||
ppc_elf_reloc_type_lookup (abfd, code)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
bfd_reloc_code_real_type code;
|
||
{
|
||
enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE;
|
||
|
||
if (!ppc_elf_howto_table[R_PPC_ADDR32])
|
||
/* Initialize howto table if needed. */
|
||
ppc_elf_howto_init ();
|
||
|
||
switch ((int) code)
|
||
{
|
||
default:
|
||
return (reloc_howto_type *) NULL;
|
||
|
||
case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break;
|
||
case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break;
|
||
case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break;
|
||
case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break;
|
||
case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break;
|
||
case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break;
|
||
case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break;
|
||
case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break;
|
||
case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break;
|
||
case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break;
|
||
case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break;
|
||
case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break;
|
||
case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break;
|
||
case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break;
|
||
case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break;
|
||
case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break;
|
||
case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break;
|
||
case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break;
|
||
case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break;
|
||
case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break;
|
||
case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break;
|
||
case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break;
|
||
case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break;
|
||
case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break;
|
||
case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break;
|
||
case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break;
|
||
case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break;
|
||
case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break;
|
||
case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break;
|
||
case BFD_RELOC_16_BASEREL: ppc_reloc = R_PPC_SECTOFF; break;
|
||
case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break;
|
||
case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break;
|
||
case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break;
|
||
case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break;
|
||
case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break;
|
||
case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break;
|
||
case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break;
|
||
case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break;
|
||
case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break;
|
||
case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break;
|
||
case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break;
|
||
case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break;
|
||
case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break;
|
||
case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break;
|
||
case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break;
|
||
case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break;
|
||
case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break;
|
||
case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break;
|
||
case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break;
|
||
case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break;
|
||
case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break;
|
||
case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break;
|
||
case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break;
|
||
}
|
||
|
||
return ppc_elf_howto_table[(int) ppc_reloc];
|
||
};
|
||
|
||
/* Set the howto pointer for a PowerPC ELF reloc. */
|
||
|
||
static void
|
||
ppc_elf_info_to_howto (abfd, cache_ptr, dst)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
arelent *cache_ptr;
|
||
Elf32_Internal_Rela *dst;
|
||
{
|
||
if (!ppc_elf_howto_table[R_PPC_ADDR32])
|
||
/* Initialize howto table if needed. */
|
||
ppc_elf_howto_init ();
|
||
|
||
BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max);
|
||
cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
|
||
}
|
||
|
||
/* Handle the R_PPC_ADDR16_HA reloc. */
|
||
|
||
static bfd_reloc_status_type
|
||
ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
|
||
output_bfd, error_message)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data ATTRIBUTE_UNUSED;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message ATTRIBUTE_UNUSED;
|
||
{
|
||
bfd_vma relocation;
|
||
|
||
if (output_bfd != NULL)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
if (reloc_entry->address > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
if (bfd_is_com_section (symbol->section))
|
||
relocation = 0;
|
||
else
|
||
relocation = symbol->value;
|
||
|
||
relocation += symbol->section->output_section->vma;
|
||
relocation += symbol->section->output_offset;
|
||
relocation += reloc_entry->addend;
|
||
|
||
reloc_entry->addend += (relocation & 0x8000) << 1;
|
||
|
||
return bfd_reloc_continue;
|
||
}
|
||
|
||
/* Function to set whether a module needs the -mrelocatable bit set. */
|
||
|
||
static boolean
|
||
ppc_elf_set_private_flags (abfd, flags)
|
||
bfd *abfd;
|
||
flagword flags;
|
||
{
|
||
BFD_ASSERT (!elf_flags_init (abfd)
|
||
|| elf_elfheader (abfd)->e_flags == flags);
|
||
|
||
elf_elfheader (abfd)->e_flags = flags;
|
||
elf_flags_init (abfd) = true;
|
||
return true;
|
||
}
|
||
|
||
/* Merge backend specific data from an object file to the output
|
||
object file when linking */
|
||
static boolean
|
||
ppc_elf_merge_private_bfd_data (ibfd, obfd)
|
||
bfd *ibfd;
|
||
bfd *obfd;
|
||
{
|
||
flagword old_flags;
|
||
flagword new_flags;
|
||
boolean error;
|
||
|
||
/* Check if we have the same endianess */
|
||
if (! _bfd_generic_verify_endian_match (ibfd, obfd))
|
||
return false;
|
||
|
||
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|
||
|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
|
||
return true;
|
||
|
||
new_flags = elf_elfheader (ibfd)->e_flags;
|
||
old_flags = elf_elfheader (obfd)->e_flags;
|
||
if (!elf_flags_init (obfd)) /* First call, no flags set */
|
||
{
|
||
elf_flags_init (obfd) = true;
|
||
elf_elfheader (obfd)->e_flags = new_flags;
|
||
}
|
||
|
||
else if (new_flags == old_flags) /* Compatible flags are ok */
|
||
;
|
||
|
||
else /* Incompatible flags */
|
||
{
|
||
/* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked
|
||
with either. */
|
||
error = false;
|
||
if ((new_flags & EF_PPC_RELOCATABLE) != 0
|
||
&& (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
|
||
{
|
||
error = true;
|
||
(*_bfd_error_handler)
|
||
(_("%s: compiled with -mrelocatable and linked with modules compiled normally"),
|
||
bfd_archive_filename (ibfd));
|
||
}
|
||
else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
|
||
&& (old_flags & EF_PPC_RELOCATABLE) != 0)
|
||
{
|
||
error = true;
|
||
(*_bfd_error_handler)
|
||
(_("%s: compiled normally and linked with modules compiled with -mrelocatable"),
|
||
bfd_archive_filename (ibfd));
|
||
}
|
||
|
||
/* The output is -mrelocatable-lib iff both the input files are. */
|
||
if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
|
||
elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
|
||
|
||
/* The output is -mrelocatable iff it can't be -mrelocatable-lib,
|
||
but each input file is either -mrelocatable or -mrelocatable-lib. */
|
||
if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
|
||
&& (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
|
||
&& (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
|
||
elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
|
||
|
||
/* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */
|
||
elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
|
||
|
||
new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
|
||
old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
|
||
|
||
/* Warn about any other mismatches */
|
||
if (new_flags != old_flags)
|
||
{
|
||
error = true;
|
||
(*_bfd_error_handler)
|
||
(_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
|
||
bfd_archive_filename (ibfd), (long) new_flags, (long) old_flags);
|
||
}
|
||
|
||
if (error)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Handle a PowerPC specific section when reading an object file. This
|
||
is called when elfcode.h finds a section with an unknown type. */
|
||
|
||
static boolean
|
||
ppc_elf_section_from_shdr (abfd, hdr, name)
|
||
bfd *abfd;
|
||
Elf32_Internal_Shdr *hdr;
|
||
const char *name;
|
||
{
|
||
asection *newsect;
|
||
flagword flags;
|
||
|
||
if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
|
||
return false;
|
||
|
||
newsect = hdr->bfd_section;
|
||
flags = bfd_get_section_flags (abfd, newsect);
|
||
if (hdr->sh_flags & SHF_EXCLUDE)
|
||
flags |= SEC_EXCLUDE;
|
||
|
||
if (hdr->sh_type == SHT_ORDERED)
|
||
flags |= SEC_SORT_ENTRIES;
|
||
|
||
bfd_set_section_flags (abfd, newsect, flags);
|
||
return true;
|
||
}
|
||
|
||
/* Set up any other section flags and such that may be necessary. */
|
||
|
||
static boolean
|
||
ppc_elf_fake_sections (abfd, shdr, asect)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
Elf32_Internal_Shdr *shdr;
|
||
asection *asect;
|
||
{
|
||
if ((asect->flags & SEC_EXCLUDE) != 0)
|
||
shdr->sh_flags |= SHF_EXCLUDE;
|
||
|
||
if ((asect->flags & SEC_SORT_ENTRIES) != 0)
|
||
shdr->sh_type = SHT_ORDERED;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Create a special linker section */
|
||
static elf_linker_section_t *
|
||
ppc_elf_create_linker_section (abfd, info, which)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
enum elf_linker_section_enum which;
|
||
{
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
elf_linker_section_t *lsect;
|
||
|
||
/* Record the first bfd section that needs the special section */
|
||
if (!dynobj)
|
||
dynobj = elf_hash_table (info)->dynobj = abfd;
|
||
|
||
/* If this is the first time, create the section */
|
||
lsect = elf_linker_section (dynobj, which);
|
||
if (!lsect)
|
||
{
|
||
elf_linker_section_t defaults;
|
||
static elf_linker_section_t zero_section;
|
||
|
||
defaults = zero_section;
|
||
defaults.which = which;
|
||
defaults.hole_written_p = false;
|
||
defaults.alignment = 2;
|
||
|
||
/* Both of these sections are (technically) created by the user
|
||
putting data in them, so they shouldn't be marked
|
||
SEC_LINKER_CREATED.
|
||
|
||
The linker creates them so it has somewhere to attach their
|
||
respective symbols. In fact, if they were empty it would
|
||
be OK to leave the symbol set to 0 (or any random number), because
|
||
the appropriate register should never be used. */
|
||
defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY);
|
||
|
||
switch (which)
|
||
{
|
||
default:
|
||
(*_bfd_error_handler) (_("%s: Unknown special linker type %d"),
|
||
bfd_get_filename (abfd),
|
||
(int) which);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return (elf_linker_section_t *) 0;
|
||
|
||
case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
|
||
defaults.name = ".sdata";
|
||
defaults.rel_name = ".rela.sdata";
|
||
defaults.bss_name = ".sbss";
|
||
defaults.sym_name = "_SDA_BASE_";
|
||
defaults.sym_offset = 32768;
|
||
break;
|
||
|
||
case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
|
||
defaults.name = ".sdata2";
|
||
defaults.rel_name = ".rela.sdata2";
|
||
defaults.bss_name = ".sbss2";
|
||
defaults.sym_name = "_SDA2_BASE_";
|
||
defaults.sym_offset = 32768;
|
||
defaults.flags |= SEC_READONLY;
|
||
break;
|
||
}
|
||
|
||
lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults);
|
||
}
|
||
|
||
return lsect;
|
||
}
|
||
|
||
/* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
|
||
need to bump up the number of section headers. */
|
||
|
||
static int
|
||
ppc_elf_additional_program_headers (abfd)
|
||
bfd *abfd;
|
||
{
|
||
asection *s;
|
||
int ret;
|
||
|
||
ret = 0;
|
||
|
||
s = bfd_get_section_by_name (abfd, ".interp");
|
||
if (s != NULL)
|
||
++ret;
|
||
|
||
s = bfd_get_section_by_name (abfd, ".sbss2");
|
||
if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
|
||
++ret;
|
||
|
||
s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0");
|
||
if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
|
||
++ret;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Modify the segment map if needed. */
|
||
|
||
static boolean
|
||
ppc_elf_modify_segment_map (abfd)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
{
|
||
return true;
|
||
}
|
||
|
||
/* The powerpc .got has a blrl instruction in it. Mark it executable. */
|
||
|
||
static asection *
|
||
ppc_elf_create_got (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
register asection *s;
|
||
flagword flags;
|
||
|
||
if (!_bfd_elf_create_got_section (abfd, info))
|
||
return NULL;
|
||
|
||
s = bfd_get_section_by_name (abfd, ".got");
|
||
if (s == NULL)
|
||
abort ();
|
||
|
||
flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED);
|
||
if (!bfd_set_section_flags (abfd, s, flags))
|
||
return NULL;
|
||
return s;
|
||
}
|
||
|
||
/* We have to create .dynsbss and .rela.sbss here so that they get mapped
|
||
to output sections (just like _bfd_elf_create_dynamic_sections has
|
||
to create .dynbss and .rela.bss). */
|
||
|
||
static boolean
|
||
ppc_elf_create_dynamic_sections (abfd, info)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
register asection *s;
|
||
flagword flags;
|
||
|
||
if (!ppc_elf_create_got (abfd, info))
|
||
return false;
|
||
|
||
if (!_bfd_elf_create_dynamic_sections (abfd, info))
|
||
return false;
|
||
|
||
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED);
|
||
|
||
s = bfd_make_section (abfd, ".dynsbss");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
|
||
return false;
|
||
|
||
if (! info->shared)
|
||
{
|
||
s = bfd_make_section (abfd, ".rela.sbss");
|
||
if (s == NULL
|
||
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|
||
|| ! bfd_set_section_alignment (abfd, s, 2))
|
||
return false;
|
||
}
|
||
|
||
s = bfd_get_section_by_name (abfd, ".plt");
|
||
if (s == NULL)
|
||
abort ();
|
||
|
||
flags = SEC_ALLOC | SEC_CODE | SEC_IN_MEMORY | SEC_LINKER_CREATED;
|
||
return bfd_set_section_flags (abfd, s, flags);
|
||
}
|
||
|
||
/* Adjust a symbol defined by a dynamic object and referenced by a
|
||
regular object. The current definition is in some section of the
|
||
dynamic object, but we're not including those sections. We have to
|
||
change the definition to something the rest of the link can
|
||
understand. */
|
||
|
||
static boolean
|
||
ppc_elf_adjust_dynamic_symbol (info, h)
|
||
struct bfd_link_info *info;
|
||
struct elf_link_hash_entry *h;
|
||
{
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
asection *s;
|
||
unsigned int power_of_two;
|
||
bfd_vma plt_offset;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string);
|
||
#endif
|
||
|
||
/* Make sure we know what is going on here. */
|
||
BFD_ASSERT (dynobj != NULL
|
||
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
|
||
|| h->weakdef != NULL
|
||
|| ((h->elf_link_hash_flags
|
||
& ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
&& (h->elf_link_hash_flags
|
||
& ELF_LINK_HASH_REF_REGULAR) != 0
|
||
&& (h->elf_link_hash_flags
|
||
& ELF_LINK_HASH_DEF_REGULAR) == 0)));
|
||
|
||
/* If this is a function, put it in the procedure linkage table. We
|
||
will fill in the contents of the procedure linkage table later,
|
||
when we know the address of the .got section. */
|
||
if (h->type == STT_FUNC
|
||
|| (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
|
||
{
|
||
if (! elf_hash_table (info)->dynamic_sections_created
|
||
|| SYMBOL_CALLS_LOCAL (info, h)
|
||
|| (info->shared && h->plt.refcount <= 0))
|
||
{
|
||
/* A PLT entry is not required/allowed when:
|
||
|
||
1. We are not using ld.so; because then the PLT entry
|
||
can't be set up, so we can't use one.
|
||
|
||
2. We know for certain that a call to this symbol
|
||
will go to this object.
|
||
|
||
3. GC has rendered the entry unused.
|
||
Note, however, that in an executable all references to the
|
||
symbol go to the PLT, so we can't turn it off in that case.
|
||
??? The correct thing to do here is to reference count
|
||
all uses of the symbol, not just those to the GOT or PLT. */
|
||
h->plt.offset = (bfd_vma) -1;
|
||
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
|
||
return true;
|
||
}
|
||
|
||
/* Make sure this symbol is output as a dynamic symbol. */
|
||
if (h->dynindx == -1)
|
||
{
|
||
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
}
|
||
BFD_ASSERT (h->dynindx != -1);
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".plt");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
/* If this is the first .plt entry, make room for the special
|
||
first entry. */
|
||
if (s->_raw_size == 0)
|
||
s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
|
||
|
||
/* The PowerPC PLT is actually composed of two parts, the first part
|
||
is 2 words (for a load and a jump), and then there is a remaining
|
||
word available at the end. */
|
||
plt_offset = (PLT_INITIAL_ENTRY_SIZE
|
||
+ (PLT_SLOT_SIZE
|
||
* ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE)
|
||
/ PLT_ENTRY_SIZE)));
|
||
|
||
/* If this symbol is not defined in a regular file, and we are
|
||
not generating a shared library, then set the symbol to this
|
||
location in the .plt. This is required to make function
|
||
pointers compare as equal between the normal executable and
|
||
the shared library. */
|
||
if (! info->shared
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
{
|
||
h->root.u.def.section = s;
|
||
h->root.u.def.value = plt_offset;
|
||
}
|
||
|
||
h->plt.offset = plt_offset;
|
||
|
||
/* Make room for this entry. After the 8192nd entry, room
|
||
for two entries is allocated. */
|
||
if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
|
||
>= PLT_NUM_SINGLE_ENTRIES)
|
||
s->_raw_size += 2 * PLT_ENTRY_SIZE;
|
||
else
|
||
s->_raw_size += PLT_ENTRY_SIZE;
|
||
|
||
/* We also need to make an entry in the .rela.plt section. */
|
||
s = bfd_get_section_by_name (dynobj, ".rela.plt");
|
||
BFD_ASSERT (s != NULL);
|
||
s->_raw_size += sizeof (Elf32_External_Rela);
|
||
|
||
return true;
|
||
}
|
||
else
|
||
h->plt.offset = (bfd_vma) -1;
|
||
|
||
/* If this is a weak symbol, and there is a real definition, the
|
||
processor independent code will have arranged for us to see the
|
||
real definition first, and we can just use the same value. */
|
||
if (h->weakdef != NULL)
|
||
{
|
||
BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
|
||
|| h->weakdef->root.type == bfd_link_hash_defweak);
|
||
h->root.u.def.section = h->weakdef->root.u.def.section;
|
||
h->root.u.def.value = h->weakdef->root.u.def.value;
|
||
return true;
|
||
}
|
||
|
||
/* This is a reference to a symbol defined by a dynamic object which
|
||
is not a function. */
|
||
|
||
/* If we are creating a shared library, we must presume that the
|
||
only references to the symbol are via the global offset table.
|
||
For such cases we need not do anything here; the relocations will
|
||
be handled correctly by relocate_section. */
|
||
if (info->shared)
|
||
return true;
|
||
|
||
/* We must allocate the symbol in our .dynbss section, which will
|
||
become part of the .bss section of the executable. There will be
|
||
an entry for this symbol in the .dynsym section. The dynamic
|
||
object will contain position independent code, so all references
|
||
from the dynamic object to this symbol will go through the global
|
||
offset table. The dynamic linker will use the .dynsym entry to
|
||
determine the address it must put in the global offset table, so
|
||
both the dynamic object and the regular object will refer to the
|
||
same memory location for the variable.
|
||
|
||
Of course, if the symbol is sufficiently small, we must instead
|
||
allocate it in .sbss. FIXME: It would be better to do this if and
|
||
only if there were actually SDAREL relocs for that symbol. */
|
||
|
||
if (h->size <= elf_gp_size (dynobj))
|
||
s = bfd_get_section_by_name (dynobj, ".dynsbss");
|
||
else
|
||
s = bfd_get_section_by_name (dynobj, ".dynbss");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
/* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
|
||
copy the initial value out of the dynamic object and into the
|
||
runtime process image. We need to remember the offset into the
|
||
.rela.bss section we are going to use. */
|
||
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
|
||
{
|
||
asection *srel;
|
||
|
||
if (h->size <= elf_gp_size (dynobj))
|
||
srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
|
||
else
|
||
srel = bfd_get_section_by_name (dynobj, ".rela.bss");
|
||
BFD_ASSERT (srel != NULL);
|
||
srel->_raw_size += sizeof (Elf32_External_Rela);
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
|
||
}
|
||
|
||
/* We need to figure out the alignment required for this symbol. I
|
||
have no idea how ELF linkers handle this. */
|
||
power_of_two = bfd_log2 (h->size);
|
||
if (power_of_two > 4)
|
||
power_of_two = 4;
|
||
|
||
/* Apply the required alignment. */
|
||
s->_raw_size = BFD_ALIGN (s->_raw_size,
|
||
(bfd_size_type) (1 << power_of_two));
|
||
if (power_of_two > bfd_get_section_alignment (dynobj, s))
|
||
{
|
||
if (! bfd_set_section_alignment (dynobj, s, power_of_two))
|
||
return false;
|
||
}
|
||
|
||
/* Define the symbol as being at this point in the section. */
|
||
h->root.u.def.section = s;
|
||
h->root.u.def.value = s->_raw_size;
|
||
|
||
/* Increment the section size to make room for the symbol. */
|
||
s->_raw_size += h->size;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Set the sizes of the dynamic sections. */
|
||
|
||
static boolean
|
||
ppc_elf_size_dynamic_sections (output_bfd, info)
|
||
bfd *output_bfd ATTRIBUTE_UNUSED;
|
||
struct bfd_link_info *info;
|
||
{
|
||
bfd *dynobj;
|
||
asection *s;
|
||
boolean plt;
|
||
boolean relocs;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_size_dynamic_sections called\n");
|
||
#endif
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
BFD_ASSERT (dynobj != NULL);
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
/* Set the contents of the .interp section to the interpreter. */
|
||
if (! info->shared)
|
||
{
|
||
s = bfd_get_section_by_name (dynobj, ".interp");
|
||
BFD_ASSERT (s != NULL);
|
||
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
|
||
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We may have created entries in the .rela.got, .rela.sdata, and
|
||
.rela.sdata2 sections. However, if we are not creating the
|
||
dynamic sections, we will not actually use these entries. Reset
|
||
the size of .rela.got, et al, which will cause it to get
|
||
stripped from the output file below. */
|
||
static char *rela_sections[] = { ".rela.got", ".rela.sdata",
|
||
".rela.sdata2", ".rela.sbss",
|
||
(char *) 0 };
|
||
char **p;
|
||
|
||
for (p = rela_sections; *p != (char *) 0; p++)
|
||
{
|
||
s = bfd_get_section_by_name (dynobj, *p);
|
||
if (s != NULL)
|
||
s->_raw_size = 0;
|
||
}
|
||
}
|
||
|
||
/* The check_relocs and adjust_dynamic_symbol entry points have
|
||
determined the sizes of the various dynamic sections. Allocate
|
||
memory for them. */
|
||
plt = false;
|
||
relocs = false;
|
||
for (s = dynobj->sections; s != NULL; s = s->next)
|
||
{
|
||
const char *name;
|
||
boolean strip;
|
||
|
||
if ((s->flags & SEC_LINKER_CREATED) == 0)
|
||
continue;
|
||
|
||
/* It's OK to base decisions on the section name, because none
|
||
of the dynobj section names depend upon the input files. */
|
||
name = bfd_get_section_name (dynobj, s);
|
||
|
||
strip = false;
|
||
|
||
if (strcmp (name, ".plt") == 0)
|
||
{
|
||
if (s->_raw_size == 0)
|
||
{
|
||
/* Strip this section if we don't need it; see the
|
||
comment below. */
|
||
strip = true;
|
||
}
|
||
else
|
||
{
|
||
/* Remember whether there is a PLT. */
|
||
plt = true;
|
||
}
|
||
}
|
||
else if (strncmp (name, ".rela", 5) == 0)
|
||
{
|
||
if (s->_raw_size == 0)
|
||
{
|
||
/* If we don't need this section, strip it from the
|
||
output file. This is mostly to handle .rela.bss and
|
||
.rela.plt. We must create both sections in
|
||
create_dynamic_sections, because they must be created
|
||
before the linker maps input sections to output
|
||
sections. The linker does that before
|
||
adjust_dynamic_symbol is called, and it is that
|
||
function which decides whether anything needs to go
|
||
into these sections. */
|
||
strip = true;
|
||
}
|
||
else
|
||
{
|
||
/* Remember whether there are any relocation sections. */
|
||
relocs = true;
|
||
|
||
/* We use the reloc_count field as a counter if we need
|
||
to copy relocs into the output file. */
|
||
s->reloc_count = 0;
|
||
}
|
||
}
|
||
else if (strcmp (name, ".got") != 0
|
||
&& strcmp (name, ".sdata") != 0
|
||
&& strcmp (name, ".sdata2") != 0)
|
||
{
|
||
/* It's not one of our sections, so don't allocate space. */
|
||
continue;
|
||
}
|
||
|
||
if (strip)
|
||
{
|
||
_bfd_strip_section_from_output (info, s);
|
||
continue;
|
||
}
|
||
|
||
/* Allocate memory for the section contents. */
|
||
s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
|
||
if (s->contents == NULL && s->_raw_size != 0)
|
||
return false;
|
||
}
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
/* Add some entries to the .dynamic section. We fill in the
|
||
values later, in ppc_elf_finish_dynamic_sections, but we
|
||
must add the entries now so that we get the correct size for
|
||
the .dynamic section. The DT_DEBUG entry is filled in by the
|
||
dynamic linker and used by the debugger. */
|
||
#define add_dynamic_entry(TAG, VAL) \
|
||
bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
|
||
|
||
if (!info->shared)
|
||
{
|
||
if (!add_dynamic_entry (DT_DEBUG, 0))
|
||
return false;
|
||
}
|
||
|
||
if (plt)
|
||
{
|
||
if (!add_dynamic_entry (DT_PLTGOT, 0)
|
||
|| !add_dynamic_entry (DT_PLTRELSZ, 0)
|
||
|| !add_dynamic_entry (DT_PLTREL, DT_RELA)
|
||
|| !add_dynamic_entry (DT_JMPREL, 0))
|
||
return false;
|
||
}
|
||
|
||
if (relocs)
|
||
{
|
||
if (!add_dynamic_entry (DT_RELA, 0)
|
||
|| !add_dynamic_entry (DT_RELASZ, 0)
|
||
|| !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
|
||
return false;
|
||
}
|
||
|
||
if ((info->flags & DF_TEXTREL) != 0)
|
||
{
|
||
if (!add_dynamic_entry (DT_TEXTREL, 0))
|
||
return false;
|
||
info->flags |= DF_TEXTREL;
|
||
}
|
||
}
|
||
#undef add_dynamic_entry
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Look through the relocs for a section during the first phase, and
|
||
allocate space in the global offset table or procedure linkage
|
||
table. */
|
||
|
||
static boolean
|
||
ppc_elf_check_relocs (abfd, info, sec, relocs)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
asection *sec;
|
||
const Elf_Internal_Rela *relocs;
|
||
{
|
||
bfd *dynobj;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
|
||
const Elf_Internal_Rela *rel;
|
||
const Elf_Internal_Rela *rel_end;
|
||
bfd_signed_vma *local_got_refcounts;
|
||
elf_linker_section_t *sdata;
|
||
elf_linker_section_t *sdata2;
|
||
asection *sreloc;
|
||
asection *sgot = NULL;
|
||
asection *srelgot = NULL;
|
||
|
||
if (info->relocateable)
|
||
return true;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n",
|
||
bfd_get_section_name (abfd, sec),
|
||
bfd_archive_filename (abfd));
|
||
#endif
|
||
|
||
/* Create the linker generated sections all the time so that the
|
||
special symbols are created. */
|
||
|
||
if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
|
||
{
|
||
sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
|
||
if (!sdata)
|
||
return false;
|
||
}
|
||
|
||
if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
|
||
{
|
||
sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
|
||
if (!sdata2)
|
||
return false;
|
||
}
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
local_got_refcounts = elf_local_got_refcounts (abfd);
|
||
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
|
||
if (!elf_bad_symtab (abfd))
|
||
sym_hashes_end -= symtab_hdr->sh_info;
|
||
|
||
sreloc = NULL;
|
||
|
||
rel_end = relocs + sec->reloc_count;
|
||
for (rel = relocs; rel < rel_end; rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
h = NULL;
|
||
else
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
|
||
/* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
|
||
This shows up in particular in an R_PPC_ADDR32 in the eabi
|
||
startup code. */
|
||
if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
|
||
{
|
||
if (sgot == NULL)
|
||
{
|
||
if (dynobj == NULL)
|
||
elf_hash_table (info)->dynobj = dynobj = abfd;
|
||
sgot = ppc_elf_create_got (dynobj, info);
|
||
if (sgot == NULL)
|
||
return false;
|
||
}
|
||
}
|
||
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
/* GOT16 relocations */
|
||
case R_PPC_GOT16:
|
||
case R_PPC_GOT16_LO:
|
||
case R_PPC_GOT16_HI:
|
||
case R_PPC_GOT16_HA:
|
||
/* This symbol requires a global offset table entry. */
|
||
|
||
if (sgot == NULL)
|
||
{
|
||
if (dynobj == NULL)
|
||
elf_hash_table (info)->dynobj = dynobj = abfd;
|
||
sgot = ppc_elf_create_got (dynobj, info);
|
||
if (sgot == NULL)
|
||
return false;
|
||
}
|
||
|
||
if (srelgot == NULL
|
||
&& (h != NULL || info->shared))
|
||
{
|
||
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
|
||
if (srelgot == NULL)
|
||
{
|
||
srelgot = bfd_make_section (dynobj, ".rela.got");
|
||
if (srelgot == NULL
|
||
|| ! bfd_set_section_flags (dynobj, srelgot,
|
||
(SEC_ALLOC
|
||
| SEC_LOAD
|
||
| SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED
|
||
| SEC_READONLY))
|
||
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
if (h != NULL)
|
||
{
|
||
if (h->got.refcount == 0)
|
||
{
|
||
/* Make sure this symbol is output as a dynamic symbol. */
|
||
if (h->dynindx == -1)
|
||
if (!bfd_elf32_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
|
||
/* Allocate space in the .got. */
|
||
sgot->_raw_size += 4;
|
||
/* Allocate relocation space. */
|
||
srelgot->_raw_size += sizeof (Elf32_External_Rela);
|
||
}
|
||
h->got.refcount++;
|
||
}
|
||
else
|
||
{
|
||
/* This is a global offset table entry for a local symbol. */
|
||
if (local_got_refcounts == NULL)
|
||
{
|
||
bfd_size_type size;
|
||
|
||
size = symtab_hdr->sh_info;
|
||
size *= sizeof (bfd_signed_vma);
|
||
local_got_refcounts
|
||
= (bfd_signed_vma *) bfd_zalloc (abfd, size);
|
||
if (local_got_refcounts == NULL)
|
||
return false;
|
||
elf_local_got_refcounts (abfd) = local_got_refcounts;
|
||
}
|
||
if (local_got_refcounts[r_symndx] == 0)
|
||
{
|
||
sgot->_raw_size += 4;
|
||
|
||
/* If we are generating a shared object, we need to
|
||
output a R_PPC_RELATIVE reloc so that the
|
||
dynamic linker can adjust this GOT entry. */
|
||
if (info->shared)
|
||
srelgot->_raw_size += sizeof (Elf32_External_Rela);
|
||
}
|
||
local_got_refcounts[r_symndx]++;
|
||
}
|
||
break;
|
||
|
||
/* Indirect .sdata relocation */
|
||
case R_PPC_EMB_SDAI16:
|
||
if (info->shared)
|
||
{
|
||
((*_bfd_error_handler)
|
||
(_("%s: relocation %s cannot be used when making a shared object"),
|
||
bfd_archive_filename (abfd), "R_PPC_EMB_SDAI16"));
|
||
return false;
|
||
}
|
||
|
||
if (srelgot == NULL && (h != NULL || info->shared))
|
||
{
|
||
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
|
||
if (srelgot == NULL)
|
||
{
|
||
srelgot = bfd_make_section (dynobj, ".rela.got");
|
||
if (srelgot == NULL
|
||
|| ! bfd_set_section_flags (dynobj, srelgot,
|
||
(SEC_ALLOC
|
||
| SEC_LOAD
|
||
| SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED
|
||
| SEC_READONLY))
|
||
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
|
||
return false;
|
||
|
||
break;
|
||
|
||
/* Indirect .sdata2 relocation */
|
||
case R_PPC_EMB_SDA2I16:
|
||
if (info->shared)
|
||
{
|
||
((*_bfd_error_handler)
|
||
(_("%s: relocation %s cannot be used when making a shared object"),
|
||
bfd_archive_filename (abfd), "R_PPC_EMB_SDA2I16"));
|
||
return false;
|
||
}
|
||
|
||
if (srelgot == NULL && (h != NULL || info->shared))
|
||
{
|
||
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
|
||
if (srelgot == NULL)
|
||
{
|
||
srelgot = bfd_make_section (dynobj, ".rela.got");
|
||
if (srelgot == NULL
|
||
|| ! bfd_set_section_flags (dynobj, srelgot,
|
||
(SEC_ALLOC
|
||
| SEC_LOAD
|
||
| SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED
|
||
| SEC_READONLY))
|
||
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel))
|
||
return false;
|
||
|
||
break;
|
||
|
||
case R_PPC_SDAREL16:
|
||
case R_PPC_EMB_SDA2REL:
|
||
case R_PPC_EMB_SDA21:
|
||
if (info->shared)
|
||
{
|
||
((*_bfd_error_handler)
|
||
(_("%s: relocation %s cannot be used when making a shared object"),
|
||
bfd_archive_filename (abfd),
|
||
ppc_elf_howto_table[(int) ELF32_R_TYPE (rel->r_info)]->name));
|
||
return false;
|
||
}
|
||
break;
|
||
|
||
case R_PPC_PLT32:
|
||
case R_PPC_PLTREL24:
|
||
case R_PPC_PLT16_LO:
|
||
case R_PPC_PLT16_HI:
|
||
case R_PPC_PLT16_HA:
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "Reloc requires a PLT entry\n");
|
||
#endif
|
||
/* This symbol requires a procedure linkage table entry. We
|
||
actually build the entry in adjust_dynamic_symbol,
|
||
because this might be a case of linking PIC code without
|
||
linking in any dynamic objects, in which case we don't
|
||
need to generate a procedure linkage table after all. */
|
||
|
||
if (h == NULL)
|
||
{
|
||
/* It does not make sense to have a procedure linkage
|
||
table entry for a local symbol. */
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return false;
|
||
}
|
||
|
||
/* Make sure this symbol is output as a dynamic symbol. */
|
||
if (h->dynindx == -1)
|
||
{
|
||
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
|
||
return false;
|
||
}
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
|
||
h->plt.refcount++;
|
||
break;
|
||
|
||
/* The following relocations don't need to propagate the
|
||
relocation if linking a shared object since they are
|
||
section relative. */
|
||
case R_PPC_SECTOFF:
|
||
case R_PPC_SECTOFF_LO:
|
||
case R_PPC_SECTOFF_HI:
|
||
case R_PPC_SECTOFF_HA:
|
||
break;
|
||
|
||
/* This refers only to functions defined in the shared library */
|
||
case R_PPC_LOCAL24PC:
|
||
break;
|
||
|
||
/* This relocation describes the C++ object vtable hierarchy.
|
||
Reconstruct it for later use during GC. */
|
||
case R_PPC_GNU_VTINHERIT:
|
||
if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
|
||
return false;
|
||
break;
|
||
|
||
/* This relocation describes which C++ vtable entries are actually
|
||
used. Record for later use during GC. */
|
||
case R_PPC_GNU_VTENTRY:
|
||
if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
||
return false;
|
||
break;
|
||
|
||
/* When creating a shared object, we must copy these
|
||
relocs into the output file. We create a reloc
|
||
section in dynobj and make room for the reloc. */
|
||
case R_PPC_REL24:
|
||
case R_PPC_REL14:
|
||
case R_PPC_REL14_BRTAKEN:
|
||
case R_PPC_REL14_BRNTAKEN:
|
||
case R_PPC_REL32:
|
||
if (h == NULL
|
||
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
|
||
|| SYMBOL_REFERENCES_LOCAL (info, h))
|
||
break;
|
||
/* fall through */
|
||
|
||
default:
|
||
if (info->shared)
|
||
{
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n",
|
||
(h && h->root.root.string) ? h->root.root.string : "<unknown>");
|
||
#endif
|
||
if (sreloc == NULL)
|
||
{
|
||
const char *name;
|
||
|
||
name = (bfd_elf_string_from_elf_section
|
||
(abfd,
|
||
elf_elfheader (abfd)->e_shstrndx,
|
||
elf_section_data (sec)->rel_hdr.sh_name));
|
||
if (name == NULL)
|
||
return false;
|
||
|
||
BFD_ASSERT (strncmp (name, ".rela", 5) == 0
|
||
&& strcmp (bfd_get_section_name (abfd, sec),
|
||
name + 5) == 0);
|
||
|
||
sreloc = bfd_get_section_by_name (dynobj, name);
|
||
if (sreloc == NULL)
|
||
{
|
||
flagword flags;
|
||
|
||
sreloc = bfd_make_section (dynobj, name);
|
||
flags = (SEC_HAS_CONTENTS | SEC_READONLY
|
||
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
|
||
if ((sec->flags & SEC_ALLOC) != 0)
|
||
flags |= SEC_ALLOC | SEC_LOAD;
|
||
if (sreloc == NULL
|
||
|| ! bfd_set_section_flags (dynobj, sreloc, flags)
|
||
|| ! bfd_set_section_alignment (dynobj, sreloc, 2))
|
||
return false;
|
||
}
|
||
if (sec->flags & SEC_READONLY)
|
||
info->flags |= DF_TEXTREL;
|
||
}
|
||
|
||
sreloc->_raw_size += sizeof (Elf32_External_Rela);
|
||
|
||
/* FIXME: We should here do what the m68k and i386
|
||
backends do: if the reloc is pc-relative, record it
|
||
in case it turns out that the reloc is unnecessary
|
||
because the symbol is forced local by versioning or
|
||
we are linking with -Bdynamic. Fortunately this
|
||
case is not frequent. */
|
||
}
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Return the section that should be marked against GC for a given
|
||
relocation. */
|
||
|
||
static asection *
|
||
ppc_elf_gc_mark_hook (abfd, info, rel, h, sym)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
||
Elf_Internal_Rela *rel;
|
||
struct elf_link_hash_entry *h;
|
||
Elf_Internal_Sym *sym;
|
||
{
|
||
if (h != NULL)
|
||
{
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
case R_PPC_GNU_VTINHERIT:
|
||
case R_PPC_GNU_VTENTRY:
|
||
break;
|
||
|
||
default:
|
||
switch (h->root.type)
|
||
{
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
return h->root.u.def.section;
|
||
|
||
case bfd_link_hash_common:
|
||
return h->root.u.c.p->section;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
return bfd_section_from_elf_index (abfd, sym->st_shndx);
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Update the got entry reference counts for the section being removed. */
|
||
|
||
static boolean
|
||
ppc_elf_gc_sweep_hook (abfd, info, sec, relocs)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
||
asection *sec;
|
||
const Elf_Internal_Rela *relocs;
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
bfd_signed_vma *local_got_refcounts;
|
||
const Elf_Internal_Rela *rel, *relend;
|
||
unsigned long r_symndx;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
local_got_refcounts = elf_local_got_refcounts (abfd);
|
||
|
||
relend = relocs + sec->reloc_count;
|
||
for (rel = relocs; rel < relend; rel++)
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
case R_PPC_GOT16:
|
||
case R_PPC_GOT16_LO:
|
||
case R_PPC_GOT16_HI:
|
||
case R_PPC_GOT16_HA:
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
if (r_symndx >= symtab_hdr->sh_info)
|
||
{
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
if (h->got.refcount > 0)
|
||
h->got.refcount--;
|
||
}
|
||
else if (local_got_refcounts != NULL)
|
||
{
|
||
if (local_got_refcounts[r_symndx] > 0)
|
||
local_got_refcounts[r_symndx]--;
|
||
}
|
||
break;
|
||
|
||
case R_PPC_PLT32:
|
||
case R_PPC_PLTREL24:
|
||
case R_PPC_PLT16_LO:
|
||
case R_PPC_PLT16_HI:
|
||
case R_PPC_PLT16_HA:
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
if (r_symndx >= symtab_hdr->sh_info)
|
||
{
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
if (h->plt.refcount > 0)
|
||
h->plt.refcount--;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Hook called by the linker routine which adds symbols from an object
|
||
file. We use it to put .comm items in .sbss, and not .bss. */
|
||
|
||
static boolean
|
||
ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
const Elf_Internal_Sym *sym;
|
||
const char **namep ATTRIBUTE_UNUSED;
|
||
flagword *flagsp ATTRIBUTE_UNUSED;
|
||
asection **secp;
|
||
bfd_vma *valp;
|
||
{
|
||
if (sym->st_shndx == SHN_COMMON
|
||
&& !info->relocateable
|
||
&& sym->st_size <= elf_gp_size (abfd)
|
||
&& info->hash->creator->flavour == bfd_target_elf_flavour)
|
||
{
|
||
/* Common symbols less than or equal to -G nn bytes are automatically
|
||
put into .sdata. */
|
||
elf_linker_section_t *sdata
|
||
= ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
|
||
|
||
if (!sdata->bss_section)
|
||
{
|
||
bfd_size_type amt;
|
||
|
||
/* We don't go through bfd_make_section, because we don't
|
||
want to attach this common section to DYNOBJ. The linker
|
||
will move the symbols to the appropriate output section
|
||
when it defines common symbols. */
|
||
amt = sizeof (asection);
|
||
sdata->bss_section = (asection *) bfd_zalloc (abfd, amt);
|
||
if (sdata->bss_section == NULL)
|
||
return false;
|
||
sdata->bss_section->name = sdata->bss_name;
|
||
sdata->bss_section->flags = SEC_IS_COMMON;
|
||
sdata->bss_section->output_section = sdata->bss_section;
|
||
amt = sizeof (asymbol);
|
||
sdata->bss_section->symbol = (asymbol *) bfd_zalloc (abfd, amt);
|
||
amt = sizeof (asymbol *);
|
||
sdata->bss_section->symbol_ptr_ptr =
|
||
(asymbol **) bfd_zalloc (abfd, amt);
|
||
if (sdata->bss_section->symbol == NULL
|
||
|| sdata->bss_section->symbol_ptr_ptr == NULL)
|
||
return false;
|
||
sdata->bss_section->symbol->name = sdata->bss_name;
|
||
sdata->bss_section->symbol->flags = BSF_SECTION_SYM;
|
||
sdata->bss_section->symbol->section = sdata->bss_section;
|
||
*sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol;
|
||
}
|
||
|
||
*secp = sdata->bss_section;
|
||
*valp = sym->st_size;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Finish up dynamic symbol handling. We set the contents of various
|
||
dynamic sections here. */
|
||
|
||
static boolean
|
||
ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
|
||
bfd *output_bfd;
|
||
struct bfd_link_info *info;
|
||
struct elf_link_hash_entry *h;
|
||
Elf_Internal_Sym *sym;
|
||
{
|
||
bfd *dynobj;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s",
|
||
h->root.root.string);
|
||
#endif
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
BFD_ASSERT (dynobj != NULL);
|
||
|
||
if (h->plt.offset != (bfd_vma) -1)
|
||
{
|
||
asection *splt;
|
||
asection *srela;
|
||
Elf_Internal_Rela rela;
|
||
bfd_vma reloc_index;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, ", plt_offset = %d", h->plt.offset);
|
||
#endif
|
||
|
||
/* This symbol has an entry in the procedure linkage table. Set
|
||
it up. */
|
||
|
||
BFD_ASSERT (h->dynindx != -1);
|
||
|
||
splt = bfd_get_section_by_name (dynobj, ".plt");
|
||
srela = bfd_get_section_by_name (dynobj, ".rela.plt");
|
||
BFD_ASSERT (splt != NULL && srela != NULL);
|
||
|
||
/* We don't need to fill in the .plt. The ppc dynamic linker
|
||
will fill it in. */
|
||
|
||
/* Fill in the entry in the .rela.plt section. */
|
||
rela.r_offset = (splt->output_section->vma
|
||
+ splt->output_offset
|
||
+ h->plt.offset);
|
||
rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT);
|
||
rela.r_addend = 0;
|
||
|
||
reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE;
|
||
if (reloc_index > PLT_NUM_SINGLE_ENTRIES)
|
||
reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2;
|
||
bfd_elf32_swap_reloca_out (output_bfd, &rela,
|
||
((Elf32_External_Rela *) srela->contents
|
||
+ reloc_index));
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
{
|
||
/* Mark the symbol as undefined, rather than as defined in
|
||
the .plt section. Leave the value alone. */
|
||
sym->st_shndx = SHN_UNDEF;
|
||
/* If the symbol is weak, we do need to clear the value.
|
||
Otherwise, the PLT entry would provide a definition for
|
||
the symbol even if the symbol wasn't defined anywhere,
|
||
and so the symbol would never be NULL. */
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
|
||
== 0)
|
||
sym->st_value = 0;
|
||
}
|
||
}
|
||
|
||
if (h->got.offset != (bfd_vma) -1)
|
||
{
|
||
asection *sgot;
|
||
asection *srela;
|
||
Elf_Internal_Rela rela;
|
||
|
||
/* This symbol has an entry in the global offset table. Set it
|
||
up. */
|
||
|
||
sgot = bfd_get_section_by_name (dynobj, ".got");
|
||
srela = bfd_get_section_by_name (dynobj, ".rela.got");
|
||
BFD_ASSERT (sgot != NULL && srela != NULL);
|
||
|
||
rela.r_offset = (sgot->output_section->vma
|
||
+ sgot->output_offset
|
||
+ (h->got.offset &~ (bfd_vma) 1));
|
||
|
||
/* If this is a -Bsymbolic link, and the symbol is defined
|
||
locally, we just want to emit a RELATIVE reloc. The entry in
|
||
the global offset table will already have been initialized in
|
||
the relocate_section function. */
|
||
if (info->shared
|
||
&& SYMBOL_REFERENCES_LOCAL (info, h))
|
||
{
|
||
rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
|
||
rela.r_addend = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT ((h->got.offset & 1) == 0);
|
||
bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
|
||
rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT);
|
||
rela.r_addend = 0;
|
||
}
|
||
|
||
bfd_elf32_swap_reloca_out (output_bfd, &rela,
|
||
((Elf32_External_Rela *) srela->contents
|
||
+ srela->reloc_count));
|
||
++srela->reloc_count;
|
||
}
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
|
||
{
|
||
asection *s;
|
||
Elf_Internal_Rela rela;
|
||
|
||
/* This symbols needs a copy reloc. Set it up. */
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, ", copy");
|
||
#endif
|
||
|
||
BFD_ASSERT (h->dynindx != -1);
|
||
|
||
if (h->size <= elf_gp_size (dynobj))
|
||
s = bfd_get_section_by_name (h->root.u.def.section->owner,
|
||
".rela.sbss");
|
||
else
|
||
s = bfd_get_section_by_name (h->root.u.def.section->owner,
|
||
".rela.bss");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
rela.r_offset = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY);
|
||
rela.r_addend = 0;
|
||
bfd_elf32_swap_reloca_out (output_bfd, &rela,
|
||
((Elf32_External_Rela *) s->contents
|
||
+ s->reloc_count));
|
||
++s->reloc_count;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "\n");
|
||
#endif
|
||
|
||
/* Mark some specially defined symbols as absolute. */
|
||
if (strcmp (h->root.root.string, "_DYNAMIC") == 0
|
||
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
|
||
|| strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
|
||
sym->st_shndx = SHN_ABS;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Finish up the dynamic sections. */
|
||
|
||
static boolean
|
||
ppc_elf_finish_dynamic_sections (output_bfd, info)
|
||
bfd *output_bfd;
|
||
struct bfd_link_info *info;
|
||
{
|
||
asection *sdyn;
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
asection *sgot = bfd_get_section_by_name (dynobj, ".got");
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
|
||
#endif
|
||
|
||
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
asection *splt;
|
||
Elf32_External_Dyn *dyncon, *dynconend;
|
||
|
||
splt = bfd_get_section_by_name (dynobj, ".plt");
|
||
BFD_ASSERT (splt != NULL && sdyn != NULL);
|
||
|
||
dyncon = (Elf32_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
const char *name;
|
||
boolean size;
|
||
|
||
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
switch (dyn.d_tag)
|
||
{
|
||
case DT_PLTGOT: name = ".plt"; size = false; break;
|
||
case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
|
||
case DT_JMPREL: name = ".rela.plt"; size = false; break;
|
||
default: name = NULL; size = false; break;
|
||
}
|
||
|
||
if (name != NULL)
|
||
{
|
||
asection *s;
|
||
|
||
s = bfd_get_section_by_name (output_bfd, name);
|
||
if (s == NULL)
|
||
dyn.d_un.d_val = 0;
|
||
else
|
||
{
|
||
if (! size)
|
||
dyn.d_un.d_ptr = s->vma;
|
||
else
|
||
{
|
||
if (s->_cooked_size != 0)
|
||
dyn.d_un.d_val = s->_cooked_size;
|
||
else
|
||
dyn.d_un.d_val = s->_raw_size;
|
||
}
|
||
}
|
||
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
|
||
easily find the address of the _GLOBAL_OFFSET_TABLE_. */
|
||
if (sgot)
|
||
{
|
||
unsigned char *contents = sgot->contents;
|
||
bfd_put_32 (output_bfd, (bfd_vma) 0x4e800021 /* blrl */, contents);
|
||
|
||
if (sdyn == NULL)
|
||
bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
|
||
else
|
||
bfd_put_32 (output_bfd,
|
||
sdyn->output_section->vma + sdyn->output_offset,
|
||
contents+4);
|
||
|
||
elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* The RELOCATE_SECTION function is called by the ELF backend linker
|
||
to handle the relocations for a section.
|
||
|
||
The relocs are always passed as Rela structures; if the section
|
||
actually uses Rel structures, the r_addend field will always be
|
||
zero.
|
||
|
||
This function is responsible for adjust the section contents as
|
||
necessary, and (if using Rela relocs and generating a
|
||
relocateable output file) adjusting the reloc addend as
|
||
necessary.
|
||
|
||
This function does not have to worry about setting the reloc
|
||
address or the reloc symbol index.
|
||
|
||
LOCAL_SYMS is a pointer to the swapped in local symbols.
|
||
|
||
LOCAL_SECTIONS is an array giving the section in the input file
|
||
corresponding to the st_shndx field of each local symbol.
|
||
|
||
The global hash table entry for the global symbols can be found
|
||
via elf_sym_hashes (input_bfd).
|
||
|
||
When generating relocateable output, this function must handle
|
||
STB_LOCAL/STT_SECTION symbols specially. The output symbol is
|
||
going to be the section symbol corresponding to the output
|
||
section, which means that the addend must be adjusted
|
||
accordingly. */
|
||
|
||
static boolean
|
||
ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
|
||
contents, relocs, local_syms, local_sections)
|
||
bfd *output_bfd;
|
||
struct bfd_link_info *info;
|
||
bfd *input_bfd;
|
||
asection *input_section;
|
||
bfd_byte *contents;
|
||
Elf_Internal_Rela *relocs;
|
||
Elf_Internal_Sym *local_syms;
|
||
asection **local_sections;
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL;
|
||
elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL;
|
||
Elf_Internal_Rela *rel = relocs;
|
||
Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
|
||
asection *sreloc = NULL;
|
||
asection *splt;
|
||
asection *sgot;
|
||
bfd_vma *local_got_offsets;
|
||
boolean ret = true;
|
||
long insn;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n",
|
||
bfd_archive_filename (input_bfd),
|
||
bfd_section_name(input_bfd, input_section),
|
||
(long) input_section->reloc_count,
|
||
(info->relocateable) ? " (relocatable)" : "");
|
||
#endif
|
||
|
||
if (info->relocateable)
|
||
return true;
|
||
|
||
if (!ppc_elf_howto_table[R_PPC_ADDR32])
|
||
/* Initialize howto table if needed. */
|
||
ppc_elf_howto_init ();
|
||
|
||
local_got_offsets = elf_local_got_offsets (input_bfd);
|
||
|
||
splt = sgot = NULL;
|
||
if (dynobj != NULL)
|
||
{
|
||
splt = bfd_get_section_by_name (dynobj, ".plt");
|
||
sgot = bfd_get_section_by_name (dynobj, ".got");
|
||
}
|
||
|
||
for (; rel < relend; rel++)
|
||
{
|
||
enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
|
||
bfd_vma offset = rel->r_offset;
|
||
bfd_vma addend = rel->r_addend;
|
||
bfd_reloc_status_type r = bfd_reloc_other;
|
||
Elf_Internal_Sym *sym = (Elf_Internal_Sym *) 0;
|
||
asection *sec = (asection *) 0;
|
||
struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) 0;
|
||
const char *sym_name = (const char *) 0;
|
||
reloc_howto_type *howto;
|
||
unsigned long r_symndx;
|
||
bfd_vma relocation;
|
||
int will_become_local;
|
||
|
||
/* Unknown relocation handling */
|
||
if ((unsigned) r_type >= (unsigned) R_PPC_max
|
||
|| !ppc_elf_howto_table[(int) r_type])
|
||
{
|
||
(*_bfd_error_handler) (_("%s: unknown relocation type %d"),
|
||
bfd_archive_filename (input_bfd),
|
||
(int) r_type);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
ret = false;
|
||
continue;
|
||
}
|
||
|
||
howto = ppc_elf_howto_table[(int) r_type];
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
sym = local_syms + r_symndx;
|
||
sec = local_sections[r_symndx];
|
||
sym_name = "<local symbol>";
|
||
|
||
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
|
||
addend = rel->r_addend;
|
||
/* Relocs to local symbols are always resolved. */
|
||
will_become_local = 1;
|
||
}
|
||
else
|
||
{
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
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_name = h->root.root.string;
|
||
|
||
/* Can this relocation be resolved immediately? */
|
||
will_become_local = SYMBOL_REFERENCES_LOCAL (info, h);
|
||
|
||
if (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
{
|
||
sec = h->root.u.def.section;
|
||
if (((r_type == R_PPC_PLT32
|
||
|| r_type == R_PPC_PLTREL24)
|
||
&& splt != NULL
|
||
&& h->plt.offset != (bfd_vma) -1)
|
||
|| (r_type == R_PPC_LOCAL24PC
|
||
&& sec->output_section == NULL)
|
||
|| ((r_type == R_PPC_GOT16
|
||
|| r_type == R_PPC_GOT16_LO
|
||
|| r_type == R_PPC_GOT16_HI
|
||
|| r_type == R_PPC_GOT16_HA)
|
||
&& elf_hash_table (info)->dynamic_sections_created
|
||
&& (! info->shared || ! will_become_local))
|
||
|| (info->shared
|
||
&& ! will_become_local
|
||
&& ((input_section->flags & SEC_ALLOC) != 0
|
||
/* Testing SEC_DEBUGGING here may be wrong.
|
||
It's here to avoid a crash when
|
||
generating a shared library with DWARF
|
||
debugging information. */
|
||
|| ((input_section->flags & SEC_DEBUGGING) != 0
|
||
&& (h->elf_link_hash_flags
|
||
& ELF_LINK_HASH_DEF_DYNAMIC) != 0))
|
||
&& (r_type == R_PPC_ADDR32
|
||
|| r_type == R_PPC_ADDR24
|
||
|| r_type == R_PPC_ADDR16
|
||
|| r_type == R_PPC_ADDR16_LO
|
||
|| r_type == R_PPC_ADDR16_HI
|
||
|| r_type == R_PPC_ADDR16_HA
|
||
|| r_type == R_PPC_ADDR14
|
||
|| r_type == R_PPC_ADDR14_BRTAKEN
|
||
|| r_type == R_PPC_ADDR14_BRNTAKEN
|
||
|| r_type == R_PPC_COPY
|
||
|| r_type == R_PPC_GLOB_DAT
|
||
|| r_type == R_PPC_JMP_SLOT
|
||
|| r_type == R_PPC_UADDR32
|
||
|| r_type == R_PPC_UADDR16
|
||
|| r_type == R_PPC_SDAREL16
|
||
|| r_type == R_PPC_EMB_NADDR32
|
||
|| r_type == R_PPC_EMB_NADDR16
|
||
|| r_type == R_PPC_EMB_NADDR16_LO
|
||
|| r_type == R_PPC_EMB_NADDR16_HI
|
||
|| r_type == R_PPC_EMB_NADDR16_HA
|
||
|| r_type == R_PPC_EMB_SDAI16
|
||
|| r_type == R_PPC_EMB_SDA2I16
|
||
|| r_type == R_PPC_EMB_SDA2REL
|
||
|| r_type == R_PPC_EMB_SDA21
|
||
|| r_type == R_PPC_EMB_MRKREF
|
||
|| r_type == R_PPC_EMB_BIT_FLD
|
||
|| r_type == R_PPC_EMB_RELSDA
|
||
|| ((r_type == R_PPC_REL24
|
||
|| r_type == R_PPC_REL32
|
||
|| r_type == R_PPC_REL14
|
||
|| r_type == R_PPC_REL14_BRTAKEN
|
||
|| r_type == R_PPC_REL14_BRNTAKEN
|
||
|| r_type == R_PPC_RELATIVE)
|
||
&& strcmp (h->root.root.string,
|
||
"_GLOBAL_OFFSET_TABLE_") != 0))))
|
||
{
|
||
/* In these cases, we don't need the relocation
|
||
value. We check specially because in some
|
||
obscure cases sec->output_section will be NULL. */
|
||
relocation = 0;
|
||
}
|
||
else if (sec->output_section == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
|
||
bfd_archive_filename (input_bfd), h->root.root.string,
|
||
bfd_get_section_name (input_bfd, input_section));
|
||
relocation = 0;
|
||
}
|
||
else
|
||
relocation = (h->root.u.def.value
|
||
+ sec->output_section->vma
|
||
+ sec->output_offset);
|
||
}
|
||
else if (h->root.type == bfd_link_hash_undefweak)
|
||
relocation = 0;
|
||
else if (info->shared
|
||
&& (!info->symbolic || info->allow_shlib_undefined)
|
||
&& !info->no_undefined
|
||
&& ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
|
||
relocation = 0;
|
||
else
|
||
{
|
||
if (! (*info->callbacks->undefined_symbol) (info,
|
||
h->root.root.string,
|
||
input_bfd,
|
||
input_section,
|
||
rel->r_offset,
|
||
(!info->shared
|
||
|| info->no_undefined
|
||
|| ELF_ST_VISIBILITY (h->other))))
|
||
return false;
|
||
relocation = 0;
|
||
}
|
||
}
|
||
|
||
switch ((int) r_type)
|
||
{
|
||
default:
|
||
(*_bfd_error_handler) (_("%s: unknown relocation type %d for symbol %s"),
|
||
bfd_archive_filename (input_bfd),
|
||
(int) r_type, sym_name);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
ret = false;
|
||
continue;
|
||
|
||
case (int) R_PPC_NONE:
|
||
continue;
|
||
|
||
/* Relocations that need no special processing. */
|
||
case (int) R_PPC_LOCAL24PC:
|
||
/* It makes no sense to point a local relocation
|
||
at a symbol not in this object. */
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& sec->output_section == NULL)
|
||
{
|
||
if (! (*info->callbacks->undefined_symbol) (info,
|
||
h->root.root.string,
|
||
input_bfd,
|
||
input_section,
|
||
rel->r_offset,
|
||
true))
|
||
return false;
|
||
continue;
|
||
}
|
||
break;
|
||
|
||
/* Relocations that may need to be propagated if this is a shared
|
||
object. */
|
||
case (int) R_PPC_REL24:
|
||
case (int) R_PPC_REL32:
|
||
case (int) R_PPC_REL14:
|
||
/* If these relocations are not to a named symbol, they can be
|
||
handled right here, no need to bother the dynamic linker. */
|
||
if (h == NULL
|
||
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
|
||
|| SYMBOL_REFERENCES_LOCAL (info, h))
|
||
break;
|
||
/* fall through */
|
||
|
||
/* Relocations that always need to be propagated if this is a shared
|
||
object. */
|
||
case (int) R_PPC_ADDR32:
|
||
case (int) R_PPC_ADDR24:
|
||
case (int) R_PPC_ADDR16:
|
||
case (int) R_PPC_ADDR16_LO:
|
||
case (int) R_PPC_ADDR16_HI:
|
||
case (int) R_PPC_ADDR16_HA:
|
||
case (int) R_PPC_ADDR14:
|
||
case (int) R_PPC_UADDR32:
|
||
case (int) R_PPC_UADDR16:
|
||
if (info->shared && r_symndx != 0)
|
||
{
|
||
Elf_Internal_Rela outrel;
|
||
int skip;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n",
|
||
(h && h->root.root.string) ? h->root.root.string : "<unknown>");
|
||
#endif
|
||
|
||
/* When generating a shared object, these relocations
|
||
are copied into the output file to be resolved at run
|
||
time. */
|
||
|
||
if (sreloc == NULL)
|
||
{
|
||
const char *name;
|
||
|
||
name = (bfd_elf_string_from_elf_section
|
||
(input_bfd,
|
||
elf_elfheader (input_bfd)->e_shstrndx,
|
||
elf_section_data (input_section)->rel_hdr.sh_name));
|
||
if (name == NULL)
|
||
return false;
|
||
|
||
BFD_ASSERT (strncmp (name, ".rela", 5) == 0
|
||
&& strcmp (bfd_get_section_name (input_bfd,
|
||
input_section),
|
||
name + 5) == 0);
|
||
|
||
sreloc = bfd_get_section_by_name (dynobj, name);
|
||
BFD_ASSERT (sreloc != NULL);
|
||
}
|
||
|
||
skip = 0;
|
||
|
||
outrel.r_offset =
|
||
_bfd_elf_section_offset (output_bfd, info, input_section,
|
||
rel->r_offset);
|
||
if (outrel.r_offset == (bfd_vma) -1
|
||
|| outrel.r_offset == (bfd_vma) -2)
|
||
skip = (int) outrel.r_offset;
|
||
outrel.r_offset += (input_section->output_section->vma
|
||
+ input_section->output_offset);
|
||
|
||
if (skip)
|
||
memset (&outrel, 0, sizeof outrel);
|
||
/* h->dynindx may be -1 if this symbol was marked to
|
||
become local. */
|
||
else if (! will_become_local)
|
||
{
|
||
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
|
||
outrel.r_addend = rel->r_addend;
|
||
}
|
||
else
|
||
{
|
||
if (r_type == R_PPC_ADDR32)
|
||
{
|
||
outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
|
||
outrel.r_addend = relocation + rel->r_addend;
|
||
}
|
||
else
|
||
{
|
||
long indx;
|
||
|
||
if (h == NULL)
|
||
sec = local_sections[r_symndx];
|
||
else
|
||
{
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| (h->root.type
|
||
== bfd_link_hash_defweak));
|
||
sec = h->root.u.def.section;
|
||
}
|
||
if (sec != NULL && bfd_is_abs_section (sec))
|
||
indx = 0;
|
||
else if (sec == NULL || sec->owner == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return false;
|
||
}
|
||
else
|
||
{
|
||
asection *osec;
|
||
|
||
osec = sec->output_section;
|
||
indx = elf_section_data (osec)->dynindx;
|
||
BFD_ASSERT (indx > 0);
|
||
#ifdef DEBUG
|
||
if (indx <= 0)
|
||
{
|
||
printf ("indx=%d section=%s flags=%08x name=%s\n",
|
||
indx, osec->name, osec->flags,
|
||
h->root.root.string);
|
||
}
|
||
#endif
|
||
}
|
||
|
||
outrel.r_info = ELF32_R_INFO (indx, r_type);
|
||
outrel.r_addend = relocation + rel->r_addend;
|
||
}
|
||
}
|
||
|
||
bfd_elf32_swap_reloca_out (output_bfd, &outrel,
|
||
(((Elf32_External_Rela *)
|
||
sreloc->contents)
|
||
+ sreloc->reloc_count));
|
||
++sreloc->reloc_count;
|
||
|
||
/* This reloc will be computed at runtime, so there's no
|
||
need to do anything now, unless this is a RELATIVE
|
||
reloc in an unallocated section. */
|
||
if (skip != -1
|
||
|| (input_section->flags & SEC_ALLOC) != 0
|
||
|| ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE)
|
||
continue;
|
||
}
|
||
|
||
/* Arithmetic adjust relocations that aren't going into a
|
||
shared object. */
|
||
if (r_type == R_PPC_ADDR16_HA
|
||
/* It's just possible that this symbol is a weak symbol
|
||
that's not actually defined anywhere. In that case,
|
||
'sec' would be NULL, and we should leave the symbol
|
||
alone (it will be set to zero elsewhere in the link). */
|
||
&& sec != NULL)
|
||
{
|
||
addend += ((relocation + addend) & 0x8000) << 1;
|
||
}
|
||
break;
|
||
|
||
/* branch taken prediction relocations */
|
||
case (int) R_PPC_ADDR14_BRTAKEN:
|
||
case (int) R_PPC_REL14_BRTAKEN:
|
||
insn = bfd_get_32 (output_bfd, contents + offset);
|
||
if ((relocation - offset) & 0x8000)
|
||
insn &= ~BRANCH_PREDICT_BIT;
|
||
else
|
||
insn |= BRANCH_PREDICT_BIT;
|
||
bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
|
||
break;
|
||
|
||
/* branch not taken predicition relocations */
|
||
case (int) R_PPC_ADDR14_BRNTAKEN:
|
||
case (int) R_PPC_REL14_BRNTAKEN:
|
||
insn = bfd_get_32 (output_bfd, contents + offset);
|
||
if ((relocation - offset) & 0x8000)
|
||
insn |= BRANCH_PREDICT_BIT;
|
||
else
|
||
insn &= ~BRANCH_PREDICT_BIT;
|
||
bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
|
||
break;
|
||
|
||
/* GOT16 relocations */
|
||
case (int) R_PPC_GOT16:
|
||
case (int) R_PPC_GOT16_LO:
|
||
case (int) R_PPC_GOT16_HI:
|
||
case (int) R_PPC_GOT16_HA:
|
||
/* Relocation is to the entry for this symbol in the global
|
||
offset table. */
|
||
BFD_ASSERT (sgot != NULL);
|
||
|
||
if (h != NULL)
|
||
{
|
||
bfd_vma off;
|
||
|
||
off = h->got.offset;
|
||
BFD_ASSERT (off != (bfd_vma) -1);
|
||
|
||
if (! elf_hash_table (info)->dynamic_sections_created
|
||
|| (info->shared
|
||
&& SYMBOL_REFERENCES_LOCAL (info, h)))
|
||
{
|
||
/* This is actually a static link, or it is a
|
||
-Bsymbolic link and the symbol is defined
|
||
locally. We must initialize this entry in the
|
||
global offset table. Since the offset must
|
||
always be a multiple of 4, we use the least
|
||
significant bit to record whether we have
|
||
initialized it already.
|
||
|
||
When doing a dynamic link, we create a .rela.got
|
||
relocation entry to initialize the value. This
|
||
is done in the finish_dynamic_symbol routine. */
|
||
if ((off & 1) != 0)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
bfd_put_32 (output_bfd, relocation,
|
||
sgot->contents + off);
|
||
h->got.offset |= 1;
|
||
}
|
||
}
|
||
|
||
relocation = sgot->output_offset + off - 4;
|
||
}
|
||
else
|
||
{
|
||
bfd_vma off;
|
||
|
||
BFD_ASSERT (local_got_offsets != NULL
|
||
&& local_got_offsets[r_symndx] != (bfd_vma) -1);
|
||
|
||
off = local_got_offsets[r_symndx];
|
||
|
||
/* The offset must always be a multiple of 4. We use
|
||
the least significant bit to record whether we have
|
||
already processed this entry. */
|
||
if ((off & 1) != 0)
|
||
off &= ~1;
|
||
else
|
||
{
|
||
bfd_put_32 (output_bfd, relocation, sgot->contents + off);
|
||
|
||
if (info->shared)
|
||
{
|
||
asection *srelgot;
|
||
Elf_Internal_Rela outrel;
|
||
|
||
/* We need to generate a R_PPC_RELATIVE reloc
|
||
for the dynamic linker. */
|
||
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
|
||
BFD_ASSERT (srelgot != NULL);
|
||
|
||
outrel.r_offset = (sgot->output_section->vma
|
||
+ sgot->output_offset
|
||
+ off);
|
||
outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
|
||
outrel.r_addend = relocation;
|
||
bfd_elf32_swap_reloca_out (output_bfd, &outrel,
|
||
(((Elf32_External_Rela *)
|
||
srelgot->contents)
|
||
+ srelgot->reloc_count));
|
||
++srelgot->reloc_count;
|
||
}
|
||
|
||
local_got_offsets[r_symndx] |= 1;
|
||
}
|
||
|
||
relocation = sgot->output_offset + off - 4;
|
||
}
|
||
break;
|
||
|
||
/* Indirect .sdata relocation */
|
||
case (int) R_PPC_EMB_SDAI16:
|
||
BFD_ASSERT (sdata != NULL);
|
||
relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
|
||
sdata, h, relocation, rel,
|
||
R_PPC_RELATIVE);
|
||
break;
|
||
|
||
/* Indirect .sdata2 relocation */
|
||
case (int) R_PPC_EMB_SDA2I16:
|
||
BFD_ASSERT (sdata2 != NULL);
|
||
relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
|
||
sdata2, h, relocation, rel,
|
||
R_PPC_RELATIVE);
|
||
break;
|
||
|
||
/* Handle the TOC16 reloc. We want to use the offset within the .got
|
||
section, not the actual VMA. This is appropriate when generating
|
||
an embedded ELF object, for which the .got section acts like the
|
||
AIX .toc section. */
|
||
case (int) R_PPC_TOC16: /* phony GOT16 relocations */
|
||
BFD_ASSERT (sec != (asection *) 0);
|
||
BFD_ASSERT (bfd_is_und_section (sec)
|
||
|| strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
|
||
|| strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0)
|
||
|
||
addend -= sec->output_section->vma + sec->output_offset + 0x8000;
|
||
break;
|
||
|
||
case (int) R_PPC_PLTREL24:
|
||
/* Relocation is to the entry for this symbol in the
|
||
procedure linkage table. */
|
||
BFD_ASSERT (h != NULL);
|
||
|
||
if (h->plt.offset == (bfd_vma) -1
|
||
|| splt == NULL)
|
||
{
|
||
/* We didn't make a PLT entry for this symbol. This
|
||
happens when statically linking PIC code, or when
|
||
using -Bsymbolic. */
|
||
break;
|
||
}
|
||
|
||
relocation = (splt->output_section->vma
|
||
+ splt->output_offset
|
||
+ h->plt.offset);
|
||
break;
|
||
|
||
/* relocate against _SDA_BASE_ */
|
||
case (int) R_PPC_SDAREL16:
|
||
{
|
||
const char *name;
|
||
|
||
BFD_ASSERT (sec != (asection *) 0);
|
||
name = bfd_get_section_name (abfd, sec->output_section);
|
||
if (strcmp (name, ".sdata") != 0
|
||
&& strcmp (name, ".sbss") != 0)
|
||
{
|
||
(*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
|
||
bfd_archive_filename (input_bfd),
|
||
sym_name,
|
||
ppc_elf_howto_table[(int) r_type]->name,
|
||
name);
|
||
}
|
||
addend -= (sdata->sym_hash->root.u.def.value
|
||
+ sdata->sym_hash->root.u.def.section->output_section->vma
|
||
+ sdata->sym_hash->root.u.def.section->output_offset);
|
||
}
|
||
break;
|
||
|
||
/* relocate against _SDA2_BASE_ */
|
||
case (int) R_PPC_EMB_SDA2REL:
|
||
{
|
||
const char *name;
|
||
|
||
BFD_ASSERT (sec != (asection *) 0);
|
||
name = bfd_get_section_name (abfd, sec->output_section);
|
||
if (strcmp (name, ".sdata2") != 0 && strcmp (name, ".sbss2") != 0)
|
||
{
|
||
(*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
|
||
bfd_archive_filename (input_bfd),
|
||
sym_name,
|
||
ppc_elf_howto_table[(int) r_type]->name,
|
||
name);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
ret = false;
|
||
continue;
|
||
}
|
||
addend -= (sdata2->sym_hash->root.u.def.value
|
||
+ sdata2->sym_hash->root.u.def.section->output_section->vma
|
||
+ sdata2->sym_hash->root.u.def.section->output_offset);
|
||
}
|
||
break;
|
||
|
||
/* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */
|
||
case (int) R_PPC_EMB_SDA21:
|
||
case (int) R_PPC_EMB_RELSDA:
|
||
{
|
||
const char *name;
|
||
int reg;
|
||
|
||
BFD_ASSERT (sec != (asection *) 0);
|
||
name = bfd_get_section_name (abfd, sec->output_section);
|
||
if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0)
|
||
{
|
||
reg = 13;
|
||
addend -= (sdata->sym_hash->root.u.def.value
|
||
+ sdata->sym_hash->root.u.def.section->output_section->vma
|
||
+ sdata->sym_hash->root.u.def.section->output_offset);
|
||
}
|
||
|
||
else if (strcmp (name, ".sdata2") == 0
|
||
|| strcmp (name, ".sbss2") == 0)
|
||
{
|
||
reg = 2;
|
||
addend -= (sdata2->sym_hash->root.u.def.value
|
||
+ sdata2->sym_hash->root.u.def.section->output_section->vma
|
||
+ sdata2->sym_hash->root.u.def.section->output_offset);
|
||
}
|
||
|
||
else if (strcmp (name, ".PPC.EMB.sdata0") == 0
|
||
|| strcmp (name, ".PPC.EMB.sbss0") == 0)
|
||
{
|
||
reg = 0;
|
||
}
|
||
|
||
else
|
||
{
|
||
(*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
|
||
bfd_archive_filename (input_bfd),
|
||
sym_name,
|
||
ppc_elf_howto_table[(int) r_type]->name,
|
||
name);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
ret = false;
|
||
continue;
|
||
}
|
||
|
||
if (r_type == R_PPC_EMB_SDA21)
|
||
{ /* fill in register field */
|
||
insn = bfd_get_32 (output_bfd, contents + offset);
|
||
insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT);
|
||
bfd_put_32 (output_bfd, (bfd_vma) insn, contents + offset);
|
||
}
|
||
}
|
||
break;
|
||
|
||
/* Relocate against the beginning of the section */
|
||
case (int) R_PPC_SECTOFF:
|
||
case (int) R_PPC_SECTOFF_LO:
|
||
case (int) R_PPC_SECTOFF_HI:
|
||
BFD_ASSERT (sec != (asection *) 0);
|
||
addend -= sec->output_section->vma;
|
||
break;
|
||
|
||
case (int) R_PPC_SECTOFF_HA:
|
||
BFD_ASSERT (sec != (asection *) 0);
|
||
addend -= sec->output_section->vma;
|
||
addend += ((relocation + addend) & 0x8000) << 1;
|
||
break;
|
||
|
||
/* Negative relocations */
|
||
case (int) R_PPC_EMB_NADDR32:
|
||
case (int) R_PPC_EMB_NADDR16:
|
||
case (int) R_PPC_EMB_NADDR16_LO:
|
||
case (int) R_PPC_EMB_NADDR16_HI:
|
||
addend -= 2 * relocation;
|
||
break;
|
||
|
||
case (int) R_PPC_EMB_NADDR16_HA:
|
||
addend -= 2 * relocation;
|
||
addend += ((relocation + addend) & 0x8000) << 1;
|
||
break;
|
||
|
||
/* NOP relocation that prevents garbage collecting linkers from omitting a
|
||
reference. */
|
||
case (int) R_PPC_EMB_MRKREF:
|
||
continue;
|
||
|
||
case (int) R_PPC_COPY:
|
||
case (int) R_PPC_GLOB_DAT:
|
||
case (int) R_PPC_JMP_SLOT:
|
||
case (int) R_PPC_RELATIVE:
|
||
case (int) R_PPC_PLT32:
|
||
case (int) R_PPC_PLTREL32:
|
||
case (int) R_PPC_PLT16_LO:
|
||
case (int) R_PPC_PLT16_HI:
|
||
case (int) R_PPC_PLT16_HA:
|
||
case (int) R_PPC_EMB_RELSEC16:
|
||
case (int) R_PPC_EMB_RELST_LO:
|
||
case (int) R_PPC_EMB_RELST_HI:
|
||
case (int) R_PPC_EMB_RELST_HA:
|
||
case (int) R_PPC_EMB_BIT_FLD:
|
||
(*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."),
|
||
bfd_archive_filename (input_bfd),
|
||
ppc_elf_howto_table[(int) r_type]->name,
|
||
sym_name);
|
||
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
ret = false;
|
||
continue;
|
||
|
||
case (int) R_PPC_GNU_VTINHERIT:
|
||
case (int) R_PPC_GNU_VTENTRY:
|
||
/* These are no-ops in the end. */
|
||
continue;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
|
||
howto->name,
|
||
(int) r_type,
|
||
sym_name,
|
||
r_symndx,
|
||
(long) offset,
|
||
(long) addend);
|
||
#endif
|
||
|
||
r = _bfd_final_link_relocate (howto,
|
||
input_bfd,
|
||
input_section,
|
||
contents,
|
||
offset,
|
||
relocation,
|
||
addend);
|
||
|
||
if (r == bfd_reloc_ok)
|
||
;
|
||
else if (r == bfd_reloc_overflow)
|
||
{
|
||
const char *name;
|
||
|
||
if (h != NULL)
|
||
{
|
||
if (h->root.type == bfd_link_hash_undefweak
|
||
&& howto->pc_relative)
|
||
{
|
||
/* Assume this is a call protected by other code that
|
||
detect the symbol is undefined. If this is the case,
|
||
we can safely ignore the overflow. If not, the
|
||
program is hosed anyway, and a little warning isn't
|
||
going to help. */
|
||
|
||
continue;
|
||
}
|
||
|
||
name = h->root.root.string;
|
||
}
|
||
else
|
||
{
|
||
name = bfd_elf_string_from_elf_section (input_bfd,
|
||
symtab_hdr->sh_link,
|
||
sym->st_name);
|
||
if (name == NULL)
|
||
continue;
|
||
if (*name == '\0')
|
||
name = bfd_section_name (input_bfd, sec);
|
||
}
|
||
|
||
if (! (*info->callbacks->reloc_overflow) (info,
|
||
name,
|
||
howto->name,
|
||
(bfd_vma) 0,
|
||
input_bfd,
|
||
input_section,
|
||
offset))
|
||
return false;
|
||
}
|
||
else
|
||
ret = false;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "\n");
|
||
#endif
|
||
|
||
return ret;
|
||
}
|
||
|
||
static enum elf_reloc_type_class
|
||
ppc_elf_reloc_type_class (rela)
|
||
const Elf_Internal_Rela *rela;
|
||
{
|
||
switch ((int) ELF32_R_TYPE (rela->r_info))
|
||
{
|
||
case R_PPC_RELATIVE:
|
||
return reloc_class_relative;
|
||
case R_PPC_REL24:
|
||
case R_PPC_ADDR24:
|
||
case R_PPC_JMP_SLOT:
|
||
return reloc_class_plt;
|
||
case R_PPC_COPY:
|
||
return reloc_class_copy;
|
||
default:
|
||
return reloc_class_normal;
|
||
}
|
||
}
|
||
|
||
/* Support for core dump NOTE sections */
|
||
static boolean
|
||
ppc_elf_grok_prstatus (abfd, note)
|
||
bfd *abfd;
|
||
Elf_Internal_Note *note;
|
||
{
|
||
int offset;
|
||
unsigned int raw_size;
|
||
|
||
switch (note->descsz)
|
||
{
|
||
default:
|
||
return false;
|
||
|
||
case 268: /* Linux/PPC */
|
||
/* pr_cursig */
|
||
elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
|
||
|
||
/* pr_pid */
|
||
elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
|
||
|
||
/* pr_reg */
|
||
offset = 72;
|
||
raw_size = 192;
|
||
|
||
break;
|
||
}
|
||
|
||
/* Make a ".reg/999" section. */
|
||
return _bfd_elfcore_make_pseudosection (abfd, ".reg",
|
||
raw_size, note->descpos + offset);
|
||
}
|
||
|
||
static boolean
|
||
ppc_elf_grok_psinfo (abfd, note)
|
||
bfd *abfd;
|
||
Elf_Internal_Note *note;
|
||
{
|
||
switch (note->descsz)
|
||
{
|
||
default:
|
||
return false;
|
||
|
||
case 128: /* Linux/PPC elf_prpsinfo */
|
||
elf_tdata (abfd)->core_program
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
|
||
elf_tdata (abfd)->core_command
|
||
= _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
|
||
}
|
||
|
||
/* Note that for some reason, a spurious space is tacked
|
||
onto the end of the args in some (at least one anyway)
|
||
implementations, so strip it off if it exists. */
|
||
|
||
{
|
||
char *command = elf_tdata (abfd)->core_command;
|
||
int n = strlen (command);
|
||
|
||
if (0 < n && command[n - 1] == ' ')
|
||
command[n - 1] = '\0';
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
#define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
|
||
#define TARGET_LITTLE_NAME "elf32-powerpcle"
|
||
#define TARGET_BIG_SYM bfd_elf32_powerpc_vec
|
||
#define TARGET_BIG_NAME "elf32-powerpc"
|
||
#define ELF_ARCH bfd_arch_powerpc
|
||
#define ELF_MACHINE_CODE EM_PPC
|
||
#define ELF_MAXPAGESIZE 0x10000
|
||
#define elf_info_to_howto ppc_elf_info_to_howto
|
||
|
||
#ifdef EM_CYGNUS_POWERPC
|
||
#define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
|
||
#endif
|
||
|
||
#ifdef EM_PPC_OLD
|
||
#define ELF_MACHINE_ALT2 EM_PPC_OLD
|
||
#endif
|
||
|
||
#define elf_backend_plt_not_loaded 1
|
||
#define elf_backend_got_symbol_offset 4
|
||
#define elf_backend_can_gc_sections 1
|
||
#define elf_backend_can_refcount 1
|
||
#define elf_backend_got_header_size 12
|
||
#define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
|
||
#define bfd_elf32_bfd_relax_section ppc_elf_relax_section
|
||
#define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
|
||
#define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
|
||
#define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
|
||
|
||
#define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
|
||
#define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
|
||
#define elf_backend_section_from_shdr ppc_elf_section_from_shdr
|
||
#define elf_backend_relocate_section ppc_elf_relocate_section
|
||
#define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
|
||
#define elf_backend_check_relocs ppc_elf_check_relocs
|
||
#define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
|
||
#define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
|
||
#define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
|
||
#define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
|
||
#define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
|
||
#define elf_backend_fake_sections ppc_elf_fake_sections
|
||
#define elf_backend_additional_program_headers ppc_elf_additional_program_headers
|
||
#define elf_backend_modify_segment_map ppc_elf_modify_segment_map
|
||
#define elf_backend_grok_prstatus ppc_elf_grok_prstatus
|
||
#define elf_backend_grok_psinfo ppc_elf_grok_psinfo
|
||
#define elf_backend_reloc_type_class ppc_elf_reloc_type_class
|
||
|
||
#include "elf32-target.h"
|