bfd/mach-o-x86-64.c

   1 /* Intel x86-64 Mach-O support for BFD.
   2    Copyright (C) 2010-2016 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, asymbol **syms)
 126 {
 127   bfd_mach_o_reloc_info reloc;
 128
 129   if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
 130     return FALSE;
 131
 132   /* On x86-64, scattered relocs are not used.  */
 133   if (reloc.r_scattered)
 134     return FALSE;
 135
 136   switch (reloc.r_type)
 137     {
 138     case BFD_MACH_O_X86_64_RELOC_UNSIGNED:
 139       if (reloc.r_pcrel)
 140         return FALSE;
 141       switch (reloc.r_length)
 142         {
 143         case 2:
 144           res->howto = &x86_64_howto_table[1];
 145           return TRUE;
 146         case 3:
 147           res->howto = &x86_64_howto_table[0];
 148           return TRUE;
 149         default:
 150           return FALSE;
 151         }
 152     case BFD_MACH_O_X86_64_RELOC_SIGNED:
 153       if (reloc.r_length == 2 && reloc.r_pcrel)
 154         {
 155           res->howto = &x86_64_howto_table[2];
 156           return TRUE;
 157         }
 158       break;
 159     case BFD_MACH_O_X86_64_RELOC_BRANCH:
 160       if (!reloc.r_pcrel)
 161         return FALSE;
 162       switch (reloc.r_length)
 163         {
 164         case 2:
 165           res->howto = &x86_64_howto_table[6];
 166           return TRUE;
 167         default:
 168           return FALSE;
 169         }
 170       break;
 171     case BFD_MACH_O_X86_64_RELOC_GOT_LOAD:
 172       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 173         {
 174           res->howto = &x86_64_howto_table[7];
 175           return TRUE;
 176         }
 177       break;
 178     case BFD_MACH_O_X86_64_RELOC_GOT:
 179       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 180         {
 181           res->howto = &x86_64_howto_table[10];
 182           return TRUE;
 183         }
 184       break;
 185     case BFD_MACH_O_X86_64_RELOC_SUBTRACTOR:
 186       if (reloc.r_pcrel)
 187         return FALSE;
 188       switch (reloc.r_length)
 189         {
 190         case 2:
 191           res->howto = &x86_64_howto_table[8];
 192           return TRUE;
 193         case 3:
 194           res->howto = &x86_64_howto_table[9];
 195           return TRUE;
 196         default:
 197           return FALSE;
 198         }
 199       break;
 200     case BFD_MACH_O_X86_64_RELOC_SIGNED_1:
 201       if (reloc.r_length == 2 && reloc.r_pcrel)
 202         {
 203           res->howto = &x86_64_howto_table[3];
 204           return TRUE;
 205         }
 206       break;
 207     case BFD_MACH_O_X86_64_RELOC_SIGNED_2:
 208       if (reloc.r_length == 2 && reloc.r_pcrel)
 209         {
 210           res->howto = &x86_64_howto_table[4];
 211           return TRUE;
 212         }
 213       break;
 214     case BFD_MACH_O_X86_64_RELOC_SIGNED_4:
 215       if (reloc.r_length == 2 && reloc.r_pcrel)
 216         {
 217           res->howto = &x86_64_howto_table[5];
 218           return TRUE;
 219         }
 220       break;
 221     default:
 222       return FALSE;
 223     }
 224   return FALSE;
 225 }
 226
 227 static bfd_boolean
 228 bfd_mach_o_x86_64_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 229 {
 230   rinfo->r_address = rel->address;
 231   rinfo->r_scattered = 0;
 232   switch (rel->howto->type)
 233     {
 234     case BFD_RELOC_32:
 235       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 236       rinfo->r_pcrel = 0;
 237       rinfo->r_length = 2;
 238       break;
 239     case BFD_RELOC_64:
 240       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 241       rinfo->r_pcrel = 0;
 242       rinfo->r_length = 3;
 243       break;
 244     case BFD_RELOC_32_PCREL:
 245       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED;
 246       rinfo->r_pcrel = 1;
 247       rinfo->r_length = 2;
 248       break;
 249     case BFD_RELOC_MACH_O_X86_64_PCREL32_1:
 250       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_1;
 251       rinfo->r_pcrel = 1;
 252       rinfo->r_length = 2;
 253       break;
 254     case BFD_RELOC_MACH_O_X86_64_PCREL32_2:
 255       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_2;
 256       rinfo->r_pcrel = 1;
 257       rinfo->r_length = 2;
 258       break;
 259     case BFD_RELOC_MACH_O_X86_64_PCREL32_4:
 260       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_4;
 261       rinfo->r_pcrel = 1;
 262       rinfo->r_length = 2;
 263       break;
 264     case BFD_RELOC_MACH_O_X86_64_BRANCH32:
 265       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_BRANCH;
 266       rinfo->r_pcrel = 1;
 267       rinfo->r_length = 2;
 268       break;
 269     case BFD_RELOC_MACH_O_SUBTRACTOR32:
 270       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 271       rinfo->r_pcrel = 0;
 272       rinfo->r_length = 2;
 273       break;
 274     case BFD_RELOC_MACH_O_SUBTRACTOR64:
 275       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 276       rinfo->r_pcrel = 0;
 277       rinfo->r_length = 3;
 278       break;
 279     case BFD_RELOC_MACH_O_X86_64_GOT:
 280       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT;
 281       rinfo->r_pcrel = 1;
 282       rinfo->r_length = 2;
 283       break;
 284     case BFD_RELOC_MACH_O_X86_64_GOT_LOAD:
 285       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT_LOAD;
 286       rinfo->r_pcrel = 1;
 287       rinfo->r_length = 2;
 288       break;
 289     default:
 290       return FALSE;
 291     }
 292   if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 293     {
 294       rinfo->r_extern = 0;
 295       rinfo->r_value =
 296         (*rel->sym_ptr_ptr)->section->output_section->target_index;
 297     }
 298   else
 299     {
 300       rinfo->r_extern = 1;
 301       rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 302     }
 303   return TRUE;
 304 }
 305
 306 static reloc_howto_type *
 307 bfd_mach_o_x86_64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 308                                          bfd_reloc_code_real_type code)
 309 {
 310   unsigned int i;
 311
 312   for (i = 0;
 313        i < sizeof (x86_64_howto_table) / sizeof (*x86_64_howto_table);
 314        i++)
 315     if (code == x86_64_howto_table[i].type)
 316       return &x86_64_howto_table[i];
 317   return NULL;
 318 }
 319
 320 static reloc_howto_type *
 321 bfd_mach_o_x86_64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 322                                          const char *name ATTRIBUTE_UNUSED)
 323 {
 324   return NULL;
 325 }
 326
 327 static bfd_boolean
 328 bfd_mach_o_section_type_valid_for_x86_64 (unsigned long val)
 329 {
 330   if (val == BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS
 331       || val == BFD_MACH_O_S_LAZY_SYMBOL_POINTERS
 332       || val == BFD_MACH_O_S_SYMBOL_STUBS)
 333     return FALSE;
 334   return TRUE;
 335 }
 336
 337 /* We want to bump the alignment of some sections.  */
 338 static const mach_o_section_name_xlat text_section_names_xlat[] =
 339   {
 340     {   ".eh_frame",                            "__eh_frame",
 341         SEC_READONLY | SEC_DATA | SEC_LOAD,     BFD_MACH_O_S_COALESCED,
 342         BFD_MACH_O_S_ATTR_LIVE_SUPPORT
 343         | BFD_MACH_O_S_ATTR_STRIP_STATIC_SYMS
 344         | BFD_MACH_O_S_ATTR_NO_TOC,             3},
 345     { NULL, NULL, 0, 0, 0, 0}
 346   };
 347
 348 const mach_o_segment_name_xlat mach_o_x86_64_segsec_names_xlat[] =
 349   {
 350     { "__TEXT", text_section_names_xlat },
 351     { NULL, NULL }
 352   };
 353
 354 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_x86_64_canonicalize_one_reloc
 355 #define bfd_mach_o_swap_reloc_out bfd_mach_o_x86_64_swap_reloc_out
 356
 357 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_x86_64_bfd_reloc_type_lookup
 358 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_x86_64_bfd_reloc_name_lookup
 359 #define bfd_mach_o_print_thread NULL
 360 #define bfd_mach_o_tgt_seg_table mach_o_x86_64_segsec_names_xlat
 361 #define bfd_mach_o_section_type_valid_for_tgt bfd_mach_o_section_type_valid_for_x86_64
 362
 363 #define TARGET_NAME             x86_64_mach_o_vec
 364 #define TARGET_STRING           "mach-o-x86-64"
 365 #define TARGET_ARCHITECTURE     bfd_arch_i386
 366 #define TARGET_PAGESIZE         4096
 367 #define TARGET_BIG_ENDIAN       0
 368 #define TARGET_ARCHIVE          0
 369 #define TARGET_PRIORITY         0
 370 #include "mach-o-target.c"