bfd/elf32-i386.c

   1 /* Intel 80386/80486-specific support for 32-bit ELF
   2    Copyright 1993 Free Software Foundation, Inc.
   3
   4 This file is part of BFD, the Binary File Descriptor library.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "bfd.h"
  21 #include "sysdep.h"
  22 #include "libbfd.h"
  23 #include "libelf.h"
  24
  25 #define USE_REL 1               /* 386 uses REL relocations instead of RELA */
  26
  27 enum reloc_type
  28   {
  29     R_386_NONE = 0,
  30     R_386_32,
  31     R_386_PC32,
  32     R_386_GOT32,
  33     R_386_PLT32,
  34     R_386_COPY,
  35     R_386_GLOB_DAT,
  36     R_386_JUMP_SLOT,
  37     R_386_RELATIVE,
  38     R_386_GOTOFF,
  39     R_386_GOTPC,
  40     R_386_max
  41   };
  42
  43 #if 0
  44 static CONST char *CONST reloc_type_names[] =
  45 {
  46   "R_386_NONE",
  47   "R_386_32",
  48   "R_386_PC32",
  49   "R_386_GOT32",
  50   "R_386_PLT32",
  51   "R_386_COPY",
  52   "R_386_GLOB_DAT",
  53   "R_386_JUMP_SLOT",
  54   "R_386_RELATIVE",
  55   "R_386_GOTOFF",
  56   "R_386_GOTPC",
  57 };
  58 #endif
  59
  60 static reloc_howto_type elf_howto_table[]=
  61 {
  62   HOWTO(R_386_NONE,      0,0, 0,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_NONE",     true,0x00000000,0x00000000,false),
  63   HOWTO(R_386_32,        0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_32",       true,0xffffffff,0xffffffff,false),
  64   HOWTO(R_386_PC32,      0,2,32,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC32",     true,0xffffffff,0xffffffff,true),
  65   HOWTO(R_386_GOT32,     0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOT32",    true,0xffffffff,0xffffffff,false),
  66   HOWTO(R_386_PLT32,     0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PLT32",    true,0xffffffff,0xffffffff,false),
  67   HOWTO(R_386_COPY,      0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_COPY",     true,0xffffffff,0xffffffff,false),
  68   HOWTO(R_386_GLOB_DAT,  0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GLOB_DAT", true,0xffffffff,0xffffffff,false),
  69   HOWTO(R_386_JUMP_SLOT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_JUMP_SLOT",true,0xffffffff,0xffffffff,false),
  70   HOWTO(R_386_RELATIVE,  0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false),
  71   HOWTO(R_386_GOTOFF,    0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTOFF",   true,0xffffffff,0xffffffff,false),
  72   HOWTO(R_386_GOTPC,     0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTPC",    true,0xffffffff,0xffffffff,false),
  73 };
  74
  75 #ifdef DEBUG_GEN_RELOC
  76 #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
  77 #else
  78 #define TRACE(str)
  79 #endif
  80
  81 static CONST struct reloc_howto_struct *
  82 DEFUN (elf_i386_reloc_type_lookup, (abfd, code),
  83        bfd *abfd AND
  84        bfd_reloc_code_real_type code)
  85 {
  86   switch (code)
  87     {
  88     case BFD_RELOC_NONE:
  89       TRACE ("BFD_RELOC_NONE");
  90       return &elf_howto_table[ (int)R_386_NONE ];
  91
  92     case BFD_RELOC_32:
  93       TRACE ("BFD_RELOC_32");
  94       return &elf_howto_table[ (int)R_386_32 ];
  95
  96     case BFD_RELOC_32_PCREL:
  97       TRACE ("BFD_RELOC_PC32");
  98       return &elf_howto_table[ (int)R_386_PC32 ];
  99
 100     case BFD_RELOC_386_GOT32:
 101       TRACE ("BFD_RELOC_386_GOT32");
 102       return &elf_howto_table[ (int)R_386_GOT32 ];
 103
 104     case BFD_RELOC_386_PLT32:
 105       TRACE ("BFD_RELOC_386_PLT32");
 106       return &elf_howto_table[ (int)R_386_PLT32 ];
 107
 108     case BFD_RELOC_386_COPY:
 109       TRACE ("BFD_RELOC_386_COPY");
 110       return &elf_howto_table[ (int)R_386_COPY ];
 111
 112     case BFD_RELOC_386_GLOB_DAT:
 113       TRACE ("BFD_RELOC_386_GLOB_DAT");
 114       return &elf_howto_table[ (int)R_386_GLOB_DAT ];
 115
 116     case BFD_RELOC_386_JUMP_SLOT:
 117       TRACE ("BFD_RELOC_386_JUMP_SLOT");
 118       return &elf_howto_table[ (int)R_386_JUMP_SLOT ];
 119
 120     case BFD_RELOC_386_RELATIVE:
 121       TRACE ("BFD_RELOC_386_RELATIVE");
 122       return &elf_howto_table[ (int)R_386_RELATIVE ];
 123
 124     case BFD_RELOC_386_GOTOFF:
 125       TRACE ("BFD_RELOC_386_GOTOFF");
 126       return &elf_howto_table[ (int)R_386_GOTOFF ];
 127
 128     case BFD_RELOC_386_GOTPC:
 129       TRACE ("BFD_RELOC_386_GOTPC");
 130       return &elf_howto_table[ (int)R_386_GOTPC ];
 131
 132     default:
 133       break;
 134     }
 135
 136   TRACE ("Unknown");
 137   return 0;
 138 }
 139
 140 static void
 141 DEFUN(elf_i386_info_to_howto, (abfd, cache_ptr, dst),
 142       bfd               *abfd AND
 143       arelent           *cache_ptr AND
 144       Elf32_Internal_Rela *dst)
 145 {
 146   BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_386_max);
 147
 148   cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
 149 }
 150
 151 static void
 152 DEFUN(elf_i386_info_to_howto_rel, (abfd, cache_ptr, dst),
 153       bfd               *abfd AND
 154       arelent           *cache_ptr AND
 155       Elf32_Internal_Rel *dst)
 156 {
 157   BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_386_max);
 158
 159   cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
 160 }
 161
 162 #define TARGET_LITTLE_SYM               bfd_elf32_i386_vec
 163 #define TARGET_LITTLE_NAME              "elf32-i386"
 164 #define ELF_ARCH                        bfd_arch_i386
 165 #define ELF_MACHINE_CODE                EM_386
 166 #define elf_info_to_howto               elf_i386_info_to_howto
 167 #define elf_info_to_howto_rel           elf_i386_info_to_howto_rel
 168 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
 169 #define ELF_MAXPAGESIZE                 0x1000
 170
 171 #include "elf32-target.h"