bfd/mach-o-x86-64.c

   1 /* Intel x86-64 Mach-O support for BFD.
   2    Copyright 2010
   3    Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "mach-o.h"
  24 #include "bfd.h"
  25 #include "libbfd.h"
  26 #include "libiberty.h"
  27 #include "mach-o/x86-64.h"
  28
  29 #define bfd_mach_o_object_p bfd_mach_o_x86_64_object_p
  30 #define bfd_mach_o_core_p bfd_mach_o_x86_64_core_p
  31 #define bfd_mach_o_mkobject bfd_mach_o_x86_64_mkobject
  32
  33 static const bfd_target *
  34 bfd_mach_o_x86_64_object_p (bfd *abfd)
  35 {
  36   return bfd_mach_o_header_p (abfd, 0, BFD_MACH_O_CPU_TYPE_X86_64);
  37 }
  38
  39 static const bfd_target *
  40 bfd_mach_o_x86_64_core_p (bfd *abfd)
  41 {
  42   return bfd_mach_o_header_p (abfd,
  43                               BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_X86_64);
  44 }
  45
  46 static bfd_boolean
  47 bfd_mach_o_x86_64_mkobject (bfd *abfd)
  48 {
  49   bfd_mach_o_data_struct *mdata;
  50
  51   if (!bfd_mach_o_mkobject_init (abfd))
  52     return FALSE;
  53
  54   mdata = bfd_mach_o_get_data (abfd);
  55   mdata->header.magic = BFD_MACH_O_MH_MAGIC_64;
  56   mdata->header.cputype = BFD_MACH_O_CPU_TYPE_X86_64;
  57   mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;
  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_X86_64_SUBTRACTOR32, 0, 2, 32, FALSE, 0,
 105         complain_overflow_bitfield,
 106         NULL, "SUBTRACTOR32",
 107         FALSE, 0xffffffff, 0xffffffff, FALSE),
 108   HOWTO(BFD_RELOC_MACH_O_X86_64_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_swap_reloc_in (arelent *res, bfd_mach_o_reloc_info *reloc)
 124 {
 125   /* On x86-64, scattered relocs are not used.  */
 126   if (reloc->r_scattered)
 127     return FALSE;
 128
 129   switch (reloc->r_type)
 130     {
 131     case BFD_MACH_O_X86_64_RELOC_UNSIGNED:
 132       if (reloc->r_pcrel)
 133         return FALSE;
 134       switch (reloc->r_length)
 135         {
 136         case 2:
 137           res->howto = &x86_64_howto_table[1];
 138           return TRUE;
 139         case 3:
 140           res->howto = &x86_64_howto_table[0];
 141           return TRUE;
 142         default:
 143           return FALSE;
 144         }
 145     case BFD_MACH_O_X86_64_RELOC_SIGNED:
 146       if (reloc->r_length == 2 && reloc->r_pcrel)
 147         {
 148           res->howto = &x86_64_howto_table[2];
 149           return TRUE;
 150         }
 151       break;
 152     case BFD_MACH_O_X86_64_RELOC_BRANCH:
 153       if (!reloc->r_pcrel)
 154         return FALSE;
 155       switch (reloc->r_length)
 156         {
 157         case 2:
 158           res->howto = &x86_64_howto_table[6];
 159           return TRUE;
 160         default:
 161           return FALSE;
 162         }
 163       break;
 164     case BFD_MACH_O_X86_64_RELOC_GOT_LOAD:
 165       if (reloc->r_length == 2 && reloc->r_pcrel && reloc->r_extern)
 166         {
 167           res->howto = &x86_64_howto_table[7];
 168           return TRUE;
 169         }
 170       break;
 171     case BFD_MACH_O_X86_64_RELOC_GOT:
 172       if (reloc->r_length == 2 && reloc->r_pcrel && reloc->r_extern)
 173         {
 174           res->howto = &x86_64_howto_table[10];
 175           return TRUE;
 176         }
 177       break;
 178     case BFD_MACH_O_X86_64_RELOC_SUBTRACTOR:
 179       if (reloc->r_pcrel)
 180         return FALSE;
 181       switch (reloc->r_length)
 182         {
 183         case 2:
 184           res->howto = &x86_64_howto_table[8];
 185           return TRUE;
 186         case 3:
 187           res->howto = &x86_64_howto_table[9];
 188           return TRUE;
 189         default:
 190           return FALSE;
 191         }
 192       break;
 193     case BFD_MACH_O_X86_64_RELOC_SIGNED_1:
 194       if (reloc->r_length == 2 && reloc->r_pcrel)
 195         {
 196           res->howto = &x86_64_howto_table[3];
 197           return TRUE;
 198         }
 199       break;
 200     case BFD_MACH_O_X86_64_RELOC_SIGNED_2:
 201       if (reloc->r_length == 2 && reloc->r_pcrel)
 202         {
 203           res->howto = &x86_64_howto_table[4];
 204           return TRUE;
 205         }
 206       break;
 207     case BFD_MACH_O_X86_64_RELOC_SIGNED_4:
 208       if (reloc->r_length == 2 && reloc->r_pcrel)
 209         {
 210           res->howto = &x86_64_howto_table[5];
 211           return TRUE;
 212         }
 213       break;
 214     default:
 215       return FALSE;
 216     }
 217   return FALSE;
 218 }
 219
 220 static bfd_boolean
 221 bfd_mach_o_x86_64_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 222 {
 223   rinfo->r_address = rel->address;
 224   rinfo->r_scattered = 0;
 225   switch (rel->howto->type)
 226     {
 227     case BFD_RELOC_32:
 228       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 229       rinfo->r_pcrel = 0;
 230       rinfo->r_length = 2;
 231       break;
 232     case BFD_RELOC_64:
 233       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 234       rinfo->r_pcrel = 0;
 235       rinfo->r_length = 3;
 236       break;
 237     case BFD_RELOC_32_PCREL:
 238       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED;
 239       rinfo->r_pcrel = 1;
 240       rinfo->r_length = 2;
 241       break;
 242     case BFD_RELOC_MACH_O_X86_64_PCREL32_1:
 243       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_1;
 244       rinfo->r_pcrel = 1;
 245       rinfo->r_length = 2;
 246       break;
 247     case BFD_RELOC_MACH_O_X86_64_PCREL32_2:
 248       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_2;
 249       rinfo->r_pcrel = 1;
 250       rinfo->r_length = 2;
 251       break;
 252     case BFD_RELOC_MACH_O_X86_64_PCREL32_4:
 253       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_4;
 254       rinfo->r_pcrel = 1;
 255       rinfo->r_length = 2;
 256       break;
 257     case BFD_RELOC_MACH_O_X86_64_BRANCH32:
 258       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_BRANCH;
 259       rinfo->r_pcrel = 1;
 260       rinfo->r_length = 2;
 261       break;
 262     case BFD_RELOC_MACH_O_X86_64_SUBTRACTOR32:
 263       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 264       rinfo->r_pcrel = 0;
 265       rinfo->r_length = 2;
 266       break;
 267     case BFD_RELOC_MACH_O_X86_64_SUBTRACTOR64:
 268       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 269       rinfo->r_pcrel = 0;
 270       rinfo->r_length = 3;
 271       break;
 272     case BFD_RELOC_MACH_O_X86_64_GOT:
 273       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT;
 274       rinfo->r_pcrel = 1;
 275       rinfo->r_length = 2;
 276       break;
 277     case BFD_RELOC_MACH_O_X86_64_GOT_LOAD:
 278       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT_LOAD;
 279       rinfo->r_pcrel = 1;
 280       rinfo->r_length = 2;
 281       break;
 282     default:
 283       return FALSE;
 284     }
 285   if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 286     {
 287       rinfo->r_extern = 0;
 288       rinfo->r_value = (*rel->sym_ptr_ptr)->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"