bfd/mach-o-x86-64.c

   1 /* Intel x86-64 Mach-O support for BFD.
   2    Copyright (C) 2010-2018 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, 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, 0,
  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 =
  57     BFD_MACH_O_CPU_SUBTYPE_X86_ALL | BFD_MACH_O_CPU_SUBTYPE_LIB64;
  58   mdata->header.byteorder = BFD_ENDIAN_LITTLE;
  59   mdata->header.version = 2;
  60
  61   return TRUE;
  62 }
  63
  64 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
  65 #define MINUS_ONE (~ (bfd_vma) 0)
  66
  67 static reloc_howto_type x86_64_howto_table[]=
  68 {
  69   /* 0 */
  70   HOWTO(BFD_RELOC_64, 0, 4, 64, FALSE, 0,
  71         complain_overflow_bitfield,
  72         NULL, "64",
  73         FALSE, MINUS_ONE, MINUS_ONE, FALSE),
  74   HOWTO(BFD_RELOC_32, 0, 2, 32, FALSE, 0,
  75         complain_overflow_bitfield,
  76         NULL, "32",
  77         FALSE, 0xffffffff, 0xffffffff, FALSE),
  78   HOWTO(BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,
  79         complain_overflow_bitfield,
  80         NULL, "DISP32",
  81         FALSE, 0xffffffff, 0xffffffff, TRUE),
  82   HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_1, 0, 2, 32, TRUE, 0,
  83         complain_overflow_bitfield,
  84         NULL, "DISP32_1",
  85         FALSE, 0xffffffff, 0xffffffff, TRUE),
  86   /* 4 */
  87   HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_2, 0, 2, 32, TRUE, 0,
  88         complain_overflow_bitfield,
  89         NULL, "DISP32_2",
  90         FALSE, 0xffffffff, 0xffffffff, TRUE),
  91   HOWTO(BFD_RELOC_MACH_O_X86_64_PCREL32_4, 0, 2, 32, TRUE, 0,
  92         complain_overflow_bitfield,
  93         NULL, "DISP32_4",
  94         FALSE, 0xffffffff, 0xffffffff, TRUE),
  95   HOWTO(BFD_RELOC_MACH_O_X86_64_BRANCH32, 0, 2, 32, TRUE, 0,
  96         complain_overflow_bitfield,
  97         NULL, "BRANCH32",
  98         FALSE, 0xffffffff, 0xffffffff, TRUE),
  99   HOWTO(BFD_RELOC_MACH_O_X86_64_GOT_LOAD, 0, 2, 32, TRUE, 0,
 100         complain_overflow_bitfield,
 101         NULL, "GOT_LOAD",
 102         FALSE, 0xffffffff, 0xffffffff, TRUE),
 103   /* 8 */
 104   HOWTO(BFD_RELOC_MACH_O_SUBTRACTOR32, 0, 2, 32, FALSE, 0,
 105         complain_overflow_bitfield,
 106         NULL, "SUBTRACTOR32",
 107         FALSE, 0xffffffff, 0xffffffff, FALSE),
 108   HOWTO(BFD_RELOC_MACH_O_SUBTRACTOR64, 0, 4, 64, FALSE, 0,
 109         complain_overflow_bitfield,
 110         NULL, "SUBTRACTOR64",
 111         FALSE, MINUS_ONE, MINUS_ONE, FALSE),
 112   HOWTO(BFD_RELOC_MACH_O_X86_64_GOT, 0, 2, 32, TRUE, 0,
 113         complain_overflow_bitfield,
 114         NULL, "GOT",
 115         FALSE, 0xffffffff, 0xffffffff, TRUE),
 116   HOWTO(BFD_RELOC_MACH_O_X86_64_BRANCH8, 0, 0, 8, TRUE, 0,
 117         complain_overflow_bitfield,
 118         NULL, "BRANCH8",
 119         FALSE, 0xff, 0xff, TRUE),
 120 };
 121
 122 static bfd_boolean
 123 bfd_mach_o_x86_64_canonicalize_one_reloc (bfd *       abfd,
 124                                           struct mach_o_reloc_info_external * raw,
 125                                           arelent *   res,
 126                                           asymbol **  syms,
 127                                           arelent *   res_base ATTRIBUTE_UNUSED)
 128 {
 129   bfd_mach_o_reloc_info reloc;
 130
 131   if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
 132     return FALSE;
 133
 134   /* On x86-64, scattered relocs are not used.  */
 135   if (reloc.r_scattered)
 136     return FALSE;
 137
 138   switch (reloc.r_type)
 139     {
 140     case BFD_MACH_O_X86_64_RELOC_UNSIGNED:
 141       if (reloc.r_pcrel)
 142         return FALSE;
 143       switch (reloc.r_length)
 144         {
 145         case 2:
 146           res->howto = &x86_64_howto_table[1];
 147           return TRUE;
 148         case 3:
 149           res->howto = &x86_64_howto_table[0];
 150           return TRUE;
 151         default:
 152           return FALSE;
 153         }
 154     case BFD_MACH_O_X86_64_RELOC_SIGNED:
 155       if (reloc.r_length == 2 && reloc.r_pcrel)
 156         {
 157           res->howto = &x86_64_howto_table[2];
 158           return TRUE;
 159         }
 160       break;
 161     case BFD_MACH_O_X86_64_RELOC_BRANCH:
 162       if (!reloc.r_pcrel)
 163         return FALSE;
 164       switch (reloc.r_length)
 165         {
 166         case 2:
 167           res->howto = &x86_64_howto_table[6];
 168           return TRUE;
 169         default:
 170           return FALSE;
 171         }
 172       break;
 173     case BFD_MACH_O_X86_64_RELOC_GOT_LOAD:
 174       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 175         {
 176           res->howto = &x86_64_howto_table[7];
 177           return TRUE;
 178         }
 179       break;
 180     case BFD_MACH_O_X86_64_RELOC_GOT:
 181       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 182         {
 183           res->howto = &x86_64_howto_table[10];
 184           return TRUE;
 185         }
 186       break;
 187     case BFD_MACH_O_X86_64_RELOC_SUBTRACTOR:
 188       if (reloc.r_pcrel)
 189         return FALSE;
 190       switch (reloc.r_length)
 191         {
 192         case 2:
 193           res->howto = &x86_64_howto_table[8];
 194           return TRUE;
 195         case 3:
 196           res->howto = &x86_64_howto_table[9];
 197           return TRUE;
 198         default:
 199           return FALSE;
 200         }
 201       break;
 202     case BFD_MACH_O_X86_64_RELOC_SIGNED_1:
 203       if (reloc.r_length == 2 && reloc.r_pcrel)
 204         {
 205           res->howto = &x86_64_howto_table[3];
 206           return TRUE;
 207         }
 208       break;
 209     case BFD_MACH_O_X86_64_RELOC_SIGNED_2:
 210       if (reloc.r_length == 2 && reloc.r_pcrel)
 211         {
 212           res->howto = &x86_64_howto_table[4];
 213           return TRUE;
 214         }
 215       break;
 216     case BFD_MACH_O_X86_64_RELOC_SIGNED_4:
 217       if (reloc.r_length == 2 && reloc.r_pcrel)
 218         {
 219           res->howto = &x86_64_howto_table[5];
 220           return TRUE;
 221         }
 222       break;
 223     default:
 224       return FALSE;
 225     }
 226   return FALSE;
 227 }
 228
 229 static bfd_boolean
 230 bfd_mach_o_x86_64_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 231 {
 232   rinfo->r_address = rel->address;
 233   rinfo->r_scattered = 0;
 234   switch (rel->howto->type)
 235     {
 236     case BFD_RELOC_32:
 237       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 238       rinfo->r_pcrel = 0;
 239       rinfo->r_length = 2;
 240       break;
 241     case BFD_RELOC_64:
 242       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 243       rinfo->r_pcrel = 0;
 244       rinfo->r_length = 3;
 245       break;
 246     case BFD_RELOC_32_PCREL:
 247       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED;
 248       rinfo->r_pcrel = 1;
 249       rinfo->r_length = 2;
 250       break;
 251     case BFD_RELOC_MACH_O_X86_64_PCREL32_1:
 252       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_1;
 253       rinfo->r_pcrel = 1;
 254       rinfo->r_length = 2;
 255       break;
 256     case BFD_RELOC_MACH_O_X86_64_PCREL32_2:
 257       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_2;
 258       rinfo->r_pcrel = 1;
 259       rinfo->r_length = 2;
 260       break;
 261     case BFD_RELOC_MACH_O_X86_64_PCREL32_4:
 262       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_4;
 263       rinfo->r_pcrel = 1;
 264       rinfo->r_length = 2;
 265       break;
 266     case BFD_RELOC_MACH_O_X86_64_BRANCH32:
 267       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_BRANCH;
 268       rinfo->r_pcrel = 1;
 269       rinfo->r_length = 2;
 270       break;
 271     case BFD_RELOC_MACH_O_SUBTRACTOR32:
 272       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 273       rinfo->r_pcrel = 0;
 274       rinfo->r_length = 2;
 275       break;
 276     case BFD_RELOC_MACH_O_SUBTRACTOR64:
 277       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 278       rinfo->r_pcrel = 0;
 279       rinfo->r_length = 3;
 280       break;
 281     case BFD_RELOC_MACH_O_X86_64_GOT:
 282       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT;
 283       rinfo->r_pcrel = 1;
 284       rinfo->r_length = 2;
 285       break;
 286     case BFD_RELOC_MACH_O_X86_64_GOT_LOAD:
 287       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT_LOAD;
 288       rinfo->r_pcrel = 1;
 289       rinfo->r_length = 2;
 290       break;
 291     default:
 292       return FALSE;
 293     }
 294   if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 295     {
 296       rinfo->r_extern = 0;
 297       rinfo->r_value =
 298         (*rel->sym_ptr_ptr)->section->output_section->target_index;
 299     }
 300   else
 301     {
 302       rinfo->r_extern = 1;
 303       rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 304     }
 305   return TRUE;
 306 }
 307
 308 static reloc_howto_type *
 309 bfd_mach_o_x86_64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 310                                          bfd_reloc_code_real_type code)
 311 {
 312   unsigned int i;
 313
 314   for (i = 0;
 315        i < sizeof (x86_64_howto_table) / sizeof (*x86_64_howto_table);
 316        i++)
 317     if (code == x86_64_howto_table[i].type)
 318       return &x86_64_howto_table[i];
 319   return NULL;
 320 }
 321
 322 static reloc_howto_type *
 323 bfd_mach_o_x86_64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 324                                          const char *name ATTRIBUTE_UNUSED)
 325 {
 326   return NULL;
 327 }
 328
 329 static bfd_boolean
 330 bfd_mach_o_section_type_valid_for_x86_64 (unsigned long val)
 331 {
 332   if (val == BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS
 333       || val == BFD_MACH_O_S_LAZY_SYMBOL_POINTERS
 334       || val == BFD_MACH_O_S_SYMBOL_STUBS)
 335     return FALSE;
 336   return TRUE;
 337 }
 338
 339 /* We want to bump the alignment of some sections.  */
 340 static const mach_o_section_name_xlat text_section_names_xlat[] =
 341   {
 342     {   ".eh_frame",                            "__eh_frame",
 343         SEC_READONLY | SEC_DATA | SEC_LOAD,     BFD_MACH_O_S_COALESCED,
 344         BFD_MACH_O_S_ATTR_LIVE_SUPPORT
 345         | BFD_MACH_O_S_ATTR_STRIP_STATIC_SYMS
 346         | BFD_MACH_O_S_ATTR_NO_TOC,             3},
 347     { NULL, NULL, 0, 0, 0, 0}
 348   };
 349
 350 const mach_o_segment_name_xlat mach_o_x86_64_segsec_names_xlat[] =
 351   {
 352     { "__TEXT", text_section_names_xlat },
 353     { NULL, NULL }
 354   };
 355
 356 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_x86_64_canonicalize_one_reloc
 357 #define bfd_mach_o_swap_reloc_out bfd_mach_o_x86_64_swap_reloc_out
 358
 359 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_x86_64_bfd_reloc_type_lookup
 360 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_x86_64_bfd_reloc_name_lookup
 361 #define bfd_mach_o_print_thread NULL
 362 #define bfd_mach_o_tgt_seg_table mach_o_x86_64_segsec_names_xlat
 363 #define bfd_mach_o_section_type_valid_for_tgt bfd_mach_o_section_type_valid_for_x86_64
 364
 365 #define TARGET_NAME             x86_64_mach_o_vec
 366 #define TARGET_STRING           "mach-o-x86-64"
 367 #define TARGET_ARCHITECTURE     bfd_arch_i386
 368 #define TARGET_PAGESIZE         4096
 369 #define TARGET_BIG_ENDIAN       0
 370 #define TARGET_ARCHIVE          0
 371 #define TARGET_PRIORITY         0
 372 #include "mach-o-target.c"