349 lines
12 KiB
C
349 lines
12 KiB
C
/* X86-64 specific support for 64-bit ELF
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Copyright 2000 Free Software Foundation, Inc.
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Contributed by Jan Hubicka <jh@suse.cz>.
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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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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/x86-64.h"
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/* We use only the RELA entries. */
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#define USE_RELA
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/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
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#define MINUS_ONE (~ (bfd_vma) 0)
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/* The relocation "howto" table. Order of fields:
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type, size, bitsize, pc_relative, complain_on_overflow, special_function,
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name, partial_inplace, src_mask, dst_pack, pcrel_offset */
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static reloc_howto_type x86_64_elf_howto_table[] = {
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HOWTO(R_X86_64_NONE, 0,0, 0,false,0,complain_overflow_dont, 0, "R_X86_64_NONE", false,0x00000000,0x00000000,false),
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HOWTO(R_X86_64_64, 0,4,64,false,0,complain_overflow_bitfield,0, "R_X86_64_64", false,MINUS_ONE ,MINUS_ONE ,false),
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HOWTO(R_X86_64_PC32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PC32", false,0xffffffff,0xffffffff,true),
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HOWTO(R_X86_64_GOT32, 0,4,32,false,0,complain_overflow_signed ,0, "R_X86_64_GOT32", false,0xffffffff,0xffffffff,false),
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HOWTO(R_X86_64_PLT32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PLT32", false,0xffffffff,0xffffffff,true),
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HOWTO(R_X86_64_COPY, 0,4,32,false,0,complain_overflow_bitfield,0, "R_X86_64_COPY", false,0xffffffff,0xffffffff,false),
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HOWTO(R_X86_64_GLOB_DAT, 0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_GLOB_DAT",false,MINUS_ONE ,MINUS_ONE ,false),
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HOWTO(R_X86_64_RELATIVE ,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_RELATIVE",false,MINUS_ONE ,MINUS_ONE ,false),
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HOWTO(R_X86_64_JUMP_SLOT,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_JUMP_SLOT",false,MINUS_ONE,MINUS_ONE ,false),
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HOWTO(R_X86_64_GOTPCREL, 0,4,32,true, 0,complain_overflow_signed ,0, "R_X86_64_PCREL", false,0xffffffff,0xffffffff,true),
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HOWTO(R_X86_64_32, 0,4,32,false,0,complain_overflow_unsigned,0, "R_X86_64_32", false,0xffffffff,0xffffffff,false),
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HOWTO(R_X86_64_32S, 0,4,32,false,0,complain_overflow_signed, 0, "R_X86_64_32S", false,0xffffffff,0xffffffff,false),
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HOWTO(R_X86_64_16, 0,1,16,false,0,complain_overflow_bitfield,0, "R_X86_64_16", false,0xffff ,0xffff, false),
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HOWTO(R_X86_64_PC16, 0,1,16,true ,0,complain_overflow_bitfield,0, "R_X86_64_PC16", false,0xffff ,0xffff, true),
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HOWTO(R_X86_64_8, 0,0, 8,false,0,complain_overflow_signed ,0, "R_X86_64_8", false,0xff ,0xff, false),
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HOWTO(R_X86_64_PC8, 0,0, 8,true ,0,complain_overflow_signed ,0, "R_X86_64_PC8", false,0xff ,0xff, true),
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};
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/* Map BFD relocs to the x86_64 elf relocs. */
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struct elf_reloc_map {
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static CONST struct elf_reloc_map x86_64_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_X86_64_NONE, },
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{ BFD_RELOC_64, R_X86_64_64, },
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{ BFD_RELOC_32_PCREL, R_X86_64_PC32, },
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{ BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
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{ BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
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{ BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
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{ BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
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{ BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
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{ BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
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{ BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
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{ BFD_RELOC_32, R_X86_64_32, },
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{ BFD_RELOC_X86_64_32S, R_X86_64_32S, },
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{ BFD_RELOC_16, R_X86_64_16, },
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{ BFD_RELOC_16_PCREL, R_X86_64_PC16, },
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{ BFD_RELOC_8, R_X86_64_8, },
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{ BFD_RELOC_8_PCREL, R_X86_64_PC8, },
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};
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static reloc_howto_type *elf64_x86_64_reloc_type_lookup
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PARAMS ((bfd *, bfd_reloc_code_real_type));
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static void elf64_x86_64_info_to_howto
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PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
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static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
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PARAMS ((bfd *));
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static boolean elf64_x86_64_relocate_section
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PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
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/* Given a BFD reloc type, return a HOWTO structure. */
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static reloc_howto_type *
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elf64_x86_64_reloc_type_lookup (abfd, code)
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bfd *abfd ATTRIBUTE_UNUSED;
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bfd_reloc_code_real_type code;
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{
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unsigned int i;
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for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
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i++)
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{
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if (x86_64_reloc_map[i].bfd_reloc_val == code)
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return &x86_64_elf_howto_table[(int)
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x86_64_reloc_map[i].elf_reloc_val];
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}
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return 0;
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}
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/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
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static void
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elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
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bfd *abfd ATTRIBUTE_UNUSED;
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arelent *cache_ptr;
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Elf64_Internal_Rela *dst;
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{
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unsigned r_type;
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r_type = ELF64_R_TYPE (dst->r_info);
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BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
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cache_ptr->howto = &x86_64_elf_howto_table[r_type];
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BFD_ASSERT (r_type == cache_ptr->howto->type);
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}
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/* Hash table functions - these will be used by dynamic linking code and
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right now they are needed to keep ld happy. */
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/* x86_64 ELF linker hash table. */
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struct elf64_x86_64_link_hash_table {
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struct elf_link_hash_table root;
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};
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/* Get the X86-64 ELF linker hash table from a link_info structure. */
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#define elf64_x86_64_hash_table(p) \
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((struct elf64_x86_64_link_hash_table *) ((p)->hash))
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/* Create an X86-64 ELF linker hash table. */
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static struct bfd_link_hash_table *
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elf64_x86_64_link_hash_table_create (abfd)
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bfd *abfd;
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{
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struct elf64_x86_64_link_hash_table *ret;
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ret = ((struct elf64_x86_64_link_hash_table *)
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bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table)));
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if (ret == (struct elf64_x86_64_link_hash_table *) NULL)
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return NULL;
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if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
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_bfd_elf_link_hash_newfunc))
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{
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bfd_release (abfd, ret);
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return NULL;
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}
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return &ret->root.root;
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}
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boolean
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elf64_x86_64_elf_object_p (abfd)
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bfd *abfd;
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{
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/* Set the right machine number for an x86-64 elf64 file. */
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bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
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return true;
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}
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/* Relocate an x86_64 ELF section. */
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static boolean
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elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
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contents, relocs, local_syms, local_sections)
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bfd *output_bfd;
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struct bfd_link_info *info;
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bfd *input_bfd;
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asection *input_section;
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bfd_byte *contents;
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Elf_Internal_Rela *relocs;
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Elf_Internal_Sym *local_syms;
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asection **local_sections;
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{
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bfd *dynobj;
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Elf_Internal_Shdr *symtab_hdr;
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struct elf_link_hash_entry **sym_hashes;
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bfd_vma *local_got_offsets;
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asection *sreloc;
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Elf_Internal_Rela *rel;
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Elf_Internal_Rela *relend;
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dynobj = elf_hash_table (info)->dynobj;
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symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
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sym_hashes = elf_sym_hashes (input_bfd);
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local_got_offsets = elf_local_got_offsets (input_bfd);
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sreloc = NULL;
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if (dynobj != NULL)
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abort ();
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rel = relocs;
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relend = relocs + input_section->reloc_count;
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for (; rel < relend; rel++)
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{
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int r_type;
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reloc_howto_type *howto;
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unsigned long r_symndx;
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struct elf_link_hash_entry *h;
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Elf_Internal_Sym *sym;
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asection *sec;
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bfd_vma relocation;
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bfd_reloc_status_type r;
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unsigned int indx;
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r_type = ELF64_R_TYPE (rel->r_info);
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if ((indx = (unsigned) r_type) >= R_X86_64_max)
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{
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bfd_set_error (bfd_error_bad_value);
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return false;
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}
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howto = x86_64_elf_howto_table + indx;
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r_symndx = ELF64_R_SYM (rel->r_info);
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if (info->relocateable)
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{
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/* This is a relocateable link. We don't have to change
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anything, unless the reloc is against a section symbol,
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in which case we have to adjust according to where the
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section symbol winds up in the output section. */
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
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{
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sec = local_sections[r_symndx];
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rel->r_addend += sec->output_offset + sym->st_value;
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}
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}
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continue;
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}
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/* This is a final link. */
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h = NULL;
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sym = NULL;
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sec = NULL;
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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sec = local_sections[r_symndx];
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relocation = (sec->output_section->vma
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+ sec->output_offset
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+ sym->st_value);
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}
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else
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{
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h = sym_hashes[r_symndx - symtab_hdr->sh_info];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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if (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
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{
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sec = h->root.u.def.section;
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if (sec->output_section == NULL)
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{
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(*_bfd_error_handler)
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(_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
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bfd_get_filename (input_bfd), h->root.root.string,
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bfd_get_section_name (input_bfd, input_section));
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relocation = 0;
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}
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else
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relocation = (h->root.u.def.value
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+ sec->output_section->vma
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+ sec->output_offset);
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}
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else if (h->root.type == bfd_link_hash_undefweak)
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relocation = 0;
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else
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{
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if (! ((*info->callbacks->undefined_symbol)
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(info, h->root.root.string, input_bfd,
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input_section, rel->r_offset,
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(!info->shared || info->no_undefined
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|| ELF_ST_VISIBILITY (h->other)))))
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return false;
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relocation = 0;
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}
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}
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/* This function should support shared objects, but don't. */
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if (info->shared)
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abort ();
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r = _bfd_final_link_relocate (howto, input_bfd, input_section,
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contents, rel->r_offset,
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relocation, rel->r_addend);
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if (r != bfd_reloc_ok)
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{
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switch (r)
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{
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default:
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case bfd_reloc_outofrange:
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abort ();
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case bfd_reloc_overflow:
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{
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const char *name;
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if (h != NULL)
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name = h->root.root.string;
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else
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{
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name = bfd_elf_string_from_elf_section (input_bfd,
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symtab_hdr->sh_link,
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sym->st_name);
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if (name == NULL)
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return false;
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if (*name == '\0')
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name = bfd_section_name (input_bfd, sec);
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}
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if (! ((*info->callbacks->reloc_overflow)
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(info, name, howto->name, (bfd_vma) 0,
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input_bfd, input_section, rel->r_offset)))
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return false;
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}
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break;
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}
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}
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}
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return true;
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}
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#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
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#define TARGET_LITTLE_NAME "elf64-x86-64"
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#define ELF_ARCH bfd_arch_i386
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#define ELF_MACHINE_CODE EM_X86_64
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#define ELF_MAXPAGESIZE 0x100000
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#define elf_info_to_howto elf64_x86_64_info_to_howto
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#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
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#define elf_backend_object_p elf64_x86_64_elf_object_p
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#define elf_backend_relocate_section elf64_x86_64_relocate_section
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#define bfd_elf64_bfd_link_hash_table_create elf64_x86_64_link_hash_table_create
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#include "elf64-target.h"
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