bfd/mach-o-x86-64.c

   1 /* Intel x86-64 Mach-O support for BFD.
   2    Copyright (C) 2010-2014 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "mach-o.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25 #include "libiberty.h"
  26 #include "mach-o/x86-64.h"
  27
  28 #define bfd_mach_o_object_p bfd_mach_o_x86_64_object_p
  29 #define bfd_mach_o_core_p bfd_mach_o_x86_64_core_p
  30 #define bfd_mach_o_mkobject bfd_mach_o_x86_64_mkobject
  31
  32 static const bfd_target *
  33 bfd_mach_o_x86_64_object_p (bfd *abfd)
  34 {
  35   return bfd_mach_o_header_p (abfd, 0, BFD_MACH_O_CPU_TYPE_X86_64);
  36 }
  37
  38 static const bfd_target *
  39 bfd_mach_o_x86_64_core_p (bfd *abfd)
  40 {
  41   return bfd_mach_o_header_p (abfd,
  42                               BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_X86_64);
  43 }
  44
  45 static bfd_boolean
  46 bfd_mach_o_x86_64_mkobject (bfd *abfd)
  47 {
  48   bfd_mach_o_data_struct *mdata;
  49
  50   if (!bfd_mach_o_mkobject_init (abfd))
  51     return FALSE;
  52
  53   mdata = bfd_mach_o_get_data (abfd);
  54   mdata->header.magic = BFD_MACH_O_MH_MAGIC_64;
  55   mdata->header.cputype = BFD_MACH_O_CPU_TYPE_X86_64;
  56   mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;
  57   mdata->header.byteorder = BFD_ENDIAN_LITTLE;
  58   mdata->header.version = 2;
  59
  60   return TRUE;
  61 }
  62
  63 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
  64 #define MINUS_ONE (~ (bfd_vma) 0)
  65
  66 static reloc_howto_type x86_64_howto_table[]=
  67 {
  68   /* 0 */
  69   HOWTO(BFD_RELOC_64, 0, 4, 64, FALSE, 0,
  70         complain_overflow_bitfield,
  71         NULL, "64",
  72         FALSE, MINUS_ONE, MINUS_ONE, FALSE),
  73   HOWTO(BFD_RELOC_32, 0, 2, 32, FALSE, 0,
  74         complain_overflow_bitfield,
  75         NULL, "32",
  76         FALSE, 0xffffffff, 0xffffffff, FALSE),
  77   HOWTO(BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,
  78         complain_overflow_bitfield,
  79         NULL, "DISP32",
  80         FALSE, 0xffffffff, 0xffffffff, TRUE),
  81   HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_1, 0, 2, 32, TRUE, 0,
  82         complain_overflow_bitfield,
  83         NULL, "DISP32_1",
  84         FALSE, 0xffffffff, 0xffffffff, TRUE),
  85   /* 4 */
  86   HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_2, 0, 2, 32, TRUE, 0,
  87         complain_overflow_bitfield,
  88         NULL, "DISP32_2",
  89         FALSE, 0xffffffff, 0xffffffff, TRUE),
  90   HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_4, 0, 2, 32, TRUE, 0,
  91         complain_overflow_bitfield,
  92         NULL, "DISP32_4",
  93         FALSE, 0xffffffff, 0xffffffff, TRUE),
  94   HOWTO(BFD_RELOC_MACH_O_X86_64_BRANCH32, 0, 2, 32, TRUE, 0,
  95         complain_overflow_bitfield,
  96         NULL, "BRANCH32",
  97         FALSE, 0xffffffff, 0xffffffff, TRUE),
  98   HOWTO(BFD_RELOC_MACH_O_X86_64_GOT_LOAD, 0, 2, 32, TRUE, 0,
  99         complain_overflow_bitfield,
 100         NULL, "GOT_LOAD",
 101         FALSE, 0xffffffff, 0xffffffff, TRUE),
 102   /* 8 */
 103   HOWTO(BFD_RELOC_MACH_O_X86_64_SUBTRACTOR32, 0, 2, 32, FALSE, 0,
 104         complain_overflow_bitfield,
 105         NULL, "SUBTRACTOR32",
 106         FALSE, 0xffffffff, 0xffffffff, FALSE),
 107   HOWTO(BFD_RELOC_MACH_O_X86_64_SUBTRACTOR64, 0, 4, 64, FALSE, 0,
 108         complain_overflow_bitfield,
 109         NULL, "SUBTRACTOR64",
 110         FALSE, MINUS_ONE, MINUS_ONE, FALSE),
 111   HOWTO(BFD_RELOC_MACH_O_X86_64_GOT, 0, 2, 32, TRUE, 0,
 112         complain_overflow_bitfield,
 113         NULL, "GOT",
 114         FALSE, 0xffffffff, 0xffffffff, TRUE),
 115   HOWTO(BFD_RELOC_MACH_O_X86_64_BRANCH8, 0, 0, 8, TRUE, 0,
 116         complain_overflow_bitfield,
 117         NULL, "BRANCH8",
 118         FALSE, 0xff, 0xff, TRUE),
 119 };
 120
 121 static bfd_boolean
 122 bfd_mach_o_x86_64_swap_reloc_in (arelent *res, bfd_mach_o_reloc_info *reloc)
 123 {
 124   /* On x86-64, scattered relocs are not used.  */
 125   if (reloc->r_scattered)
 126     return FALSE;
 127
 128   switch (reloc->r_type)
 129     {
 130     case BFD_MACH_O_X86_64_RELOC_UNSIGNED:
 131       if (reloc->r_pcrel)
 132         return FALSE;
 133       switch (reloc->r_length)
 134         {
 135         case 2:
 136           res->howto = &x86_64_howto_table[1];
 137           return TRUE;
 138         case 3:
 139           res->howto = &x86_64_howto_table[0];
 140           return TRUE;
 141         default:
 142           return FALSE;
 143         }
 144     case BFD_MACH_O_X86_64_RELOC_SIGNED:
 145       if (reloc->r_length == 2 && reloc->r_pcrel)
 146         {
 147           res->howto = &x86_64_howto_table[2];
 148           return TRUE;
 149         }
 150       break;
 151     case BFD_MACH_O_X86_64_RELOC_BRANCH:
 152       if (!reloc->r_pcrel)
 153         return FALSE;
 154       switch (reloc->r_length)
 155         {
 156         case 2:
 157           res->howto = &x86_64_howto_table[6];
 158           return TRUE;
 159         default:
 160           return FALSE;
 161         }
 162       break;
 163     case BFD_MACH_O_X86_64_RELOC_GOT_LOAD:
 164       if (reloc->r_length == 2 && reloc->r_pcrel && reloc->r_extern)
 165         {
 166           res->howto = &x86_64_howto_table[7];
 167           return TRUE;
 168         }
 169       break;
 170     case BFD_MACH_O_X86_64_RELOC_GOT:
 171       if (reloc->r_length == 2 && reloc->r_pcrel && reloc->r_extern)
 172         {
 173           res->howto = &x86_64_howto_table[10];
 174           return TRUE;
 175         }
 176       break;
 177     case BFD_MACH_O_X86_64_RELOC_SUBTRACTOR:
 178       if (reloc->r_pcrel)
 179         return FALSE;
 180       switch (reloc->r_length)
 181         {
 182         case 2:
 183           res->howto = &x86_64_howto_table[8];
 184           return TRUE;
 185         case 3:
 186           res->howto = &x86_64_howto_table[9];
 187           return TRUE;
 188         default:
 189           return FALSE;
 190         }
 191       break;
 192     case BFD_MACH_O_X86_64_RELOC_SIGNED_1:
 193       if (reloc->r_length == 2 && reloc->r_pcrel)
 194         {
 195           res->howto = &x86_64_howto_table[3];
 196           return TRUE;
 197         }
 198       break;
 199     case BFD_MACH_O_X86_64_RELOC_SIGNED_2:
 200       if (reloc->r_length == 2 && reloc->r_pcrel)
 201         {
 202           res->howto = &x86_64_howto_table[4];
 203           return TRUE;
 204         }
 205       break;
 206     case BFD_MACH_O_X86_64_RELOC_SIGNED_4:
 207       if (reloc->r_length == 2 && reloc->r_pcrel)
 208         {
 209           res->howto = &x86_64_howto_table[5];
 210           return TRUE;
 211         }
 212       break;
 213     default:
 214       return FALSE;
 215     }
 216   return FALSE;
 217 }
 218
 219 static bfd_boolean
 220 bfd_mach_o_x86_64_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 221 {
 222   rinfo->r_address = rel->address;
 223   rinfo->r_scattered = 0;
 224   switch (rel->howto->type)
 225     {
 226     case BFD_RELOC_32:
 227       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 228       rinfo->r_pcrel = 0;
 229       rinfo->r_length = 2;
 230       break;
 231     case BFD_RELOC_64:
 232       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 233       rinfo->r_pcrel = 0;
 234       rinfo->r_length = 3;
 235       break;
 236     case BFD_RELOC_32_PCREL:
 237       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED;
 238       rinfo->r_pcrel = 1;
 239       rinfo->r_length = 2;
 240       break;
 241     case BFD_RELOC_MACH_O_X86_64_PCREL32_1:
 242       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_1;
 243       rinfo->r_pcrel = 1;
 244       rinfo->r_length = 2;
 245       break;
 246     case BFD_RELOC_MACH_O_X86_64_PCREL32_2:
 247       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_2;
 248       rinfo->r_pcrel = 1;
 249       rinfo->r_length = 2;
 250       break;
 251     case BFD_RELOC_MACH_O_X86_64_PCREL32_4:
 252       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_4;
 253       rinfo->r_pcrel = 1;
 254       rinfo->r_length = 2;
 255       break;
 256     case BFD_RELOC_MACH_O_X86_64_BRANCH32:
 257       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_BRANCH;
 258       rinfo->r_pcrel = 1;
 259       rinfo->r_length = 2;
 260       break;
 261     case BFD_RELOC_MACH_O_X86_64_SUBTRACTOR32:
 262       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 263       rinfo->r_pcrel = 0;
 264       rinfo->r_length = 2;
 265       break;
 266     case BFD_RELOC_MACH_O_X86_64_SUBTRACTOR64:
 267       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 268       rinfo->r_pcrel = 0;
 269       rinfo->r_length = 3;
 270       break;
 271     case BFD_RELOC_MACH_O_X86_64_GOT:
 272       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT;
 273       rinfo->r_pcrel = 1;
 274       rinfo->r_length = 2;
 275       break;
 276     case BFD_RELOC_MACH_O_X86_64_GOT_LOAD:
 277       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT_LOAD;
 278       rinfo->r_pcrel = 1;
 279       rinfo->r_length = 2;
 280       break;
 281     default:
 282       return FALSE;
 283     }
 284   if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 285     {
 286       rinfo->r_extern = 0;
 287       rinfo->r_value =
 288         (*rel->sym_ptr_ptr)->section->output_section->target_index;
 289     }
 290   else
 291     {
 292       rinfo->r_extern = 1;
 293       rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 294     }
 295   return TRUE;
 296 }
 297
 298 static reloc_howto_type *
 299 bfd_mach_o_x86_64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 300                                          bfd_reloc_code_real_type code)
 301 {
 302   unsigned int i;
 303
 304   for (i = 0;
 305        i < sizeof (x86_64_howto_table) / sizeof (*x86_64_howto_table);
 306        i++)
 307     if (code == x86_64_howto_table[i].type)
 308       return &x86_64_howto_table[i];
 309   return NULL;
 310 }
 311
 312 static reloc_howto_type *
 313 bfd_mach_o_x86_64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 314                                          const char *name ATTRIBUTE_UNUSED)
 315 {
 316   return NULL;
 317 }
 318
 319 static bfd_boolean
 320 bfd_mach_o_section_type_valid_for_x86_64 (unsigned long val)
 321 {
 322   if (val == BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS
 323       || val == BFD_MACH_O_S_LAZY_SYMBOL_POINTERS
 324       || val == BFD_MACH_O_S_SYMBOL_STUBS)
 325     return FALSE;
 326   return TRUE;
 327 }
 328
 329 /* We want to bump the alignment of some sections.  */
 330 static const mach_o_section_name_xlat text_section_names_xlat[] =
 331   {
 332     {   ".eh_frame",                            "__eh_frame",
 333         SEC_READONLY | SEC_DATA | SEC_LOAD,     BFD_MACH_O_S_COALESCED,
 334         BFD_MACH_O_S_ATTR_LIVE_SUPPORT
 335         | BFD_MACH_O_S_ATTR_STRIP_STATIC_SYMS
 336         | BFD_MACH_O_S_ATTR_NO_TOC,             3},
 337     { NULL, NULL, 0, 0, 0, 0}
 338   };
 339
 340 const mach_o_segment_name_xlat mach_o_x86_64_segsec_names_xlat[] =
 341   {
 342     { "__TEXT", text_section_names_xlat },
 343     { NULL, NULL }
 344   };
 345
 346 #define bfd_mach_o_swap_reloc_in bfd_mach_o_x86_64_swap_reloc_in
 347 #define bfd_mach_o_swap_reloc_out bfd_mach_o_x86_64_swap_reloc_out
 348
 349 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_x86_64_bfd_reloc_type_lookup
 350 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_x86_64_bfd_reloc_name_lookup
 351 #define bfd_mach_o_print_thread NULL
 352 #define bfd_mach_o_tgt_seg_table mach_o_x86_64_segsec_names_xlat
 353 #define bfd_mach_o_section_type_valid_for_tgt bfd_mach_o_section_type_valid_for_x86_64
 354
 355 #define TARGET_NAME             mach_o_x86_64_vec
 356 #define TARGET_STRING           "mach-o-x86-64"
 357 #define TARGET_ARCHITECTURE     bfd_arch_i386
 358 #define TARGET_BIG_ENDIAN       0
 359 #define TARGET_ARCHIVE          0
 360 #define TARGET_PRIORITY         0
 361 #include "mach-o-target.c"