bfd/mach-o-x86-64.c

   1 /* Intel x86-64 Mach-O support for BFD.
   2    Copyright (C) 2010-2022 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 "bfd.h"
  23 #include "libbfd.h"
  24 #include "libiberty.h"
  25 #include "mach-o.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 bfd_cleanup
  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 bfd_cleanup
  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 bool
  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   /* 12 */
 121   HOWTO(BFD_RELOC_MACH_O_X86_64_TLV, 0, 2, 32, true, 0,
 122         complain_overflow_bitfield,
 123         NULL, "TLV",
 124         false, 0xffffffff, 0xffffffff, true),
 125 };
 126
 127 static bool
 128 bfd_mach_o_x86_64_canonicalize_one_reloc (bfd *       abfd,
 129                                           struct mach_o_reloc_info_external * raw,
 130                                           arelent *   res,
 131                                           asymbol **  syms,
 132                                           arelent *   res_base ATTRIBUTE_UNUSED)
 133 {
 134   bfd_mach_o_reloc_info reloc;
 135
 136   if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
 137     return false;
 138
 139   /* On x86-64, scattered relocs are not used.  */
 140   if (reloc.r_scattered)
 141     return false;
 142
 143   switch (reloc.r_type)
 144     {
 145     case BFD_MACH_O_X86_64_RELOC_UNSIGNED:
 146       if (reloc.r_pcrel)
 147         return false;
 148       switch (reloc.r_length)
 149         {
 150         case 2:
 151           res->howto = &x86_64_howto_table[1];
 152           return true;
 153         case 3:
 154           res->howto = &x86_64_howto_table[0];
 155           return true;
 156         default:
 157           return false;
 158         }
 159     case BFD_MACH_O_X86_64_RELOC_SIGNED:
 160       if (reloc.r_length == 2 && reloc.r_pcrel)
 161         {
 162           res->howto = &x86_64_howto_table[2];
 163           return true;
 164         }
 165       break;
 166     case BFD_MACH_O_X86_64_RELOC_BRANCH:
 167       if (!reloc.r_pcrel)
 168         return false;
 169       switch (reloc.r_length)
 170         {
 171         case 2:
 172           res->howto = &x86_64_howto_table[6];
 173           return true;
 174         default:
 175           return false;
 176         }
 177       break;
 178     case BFD_MACH_O_X86_64_RELOC_GOT_LOAD:
 179       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 180         {
 181           res->howto = &x86_64_howto_table[7];
 182           return true;
 183         }
 184       break;
 185     case BFD_MACH_O_X86_64_RELOC_GOT:
 186       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 187         {
 188           res->howto = &x86_64_howto_table[10];
 189           return true;
 190         }
 191       break;
 192     case BFD_MACH_O_X86_64_RELOC_SUBTRACTOR:
 193       if (reloc.r_pcrel)
 194         return false;
 195       switch (reloc.r_length)
 196         {
 197         case 2:
 198           res->howto = &x86_64_howto_table[8];
 199           return true;
 200         case 3:
 201           res->howto = &x86_64_howto_table[9];
 202           return true;
 203         default:
 204           return false;
 205         }
 206       break;
 207     case BFD_MACH_O_X86_64_RELOC_SIGNED_1:
 208       if (reloc.r_length == 2 && reloc.r_pcrel)
 209         {
 210           res->howto = &x86_64_howto_table[3];
 211           return true;
 212         }
 213       break;
 214     case BFD_MACH_O_X86_64_RELOC_SIGNED_2:
 215       if (reloc.r_length == 2 && reloc.r_pcrel)
 216         {
 217           res->howto = &x86_64_howto_table[4];
 218           return true;
 219         }
 220       break;
 221     case BFD_MACH_O_X86_64_RELOC_SIGNED_4:
 222       if (reloc.r_length == 2 && reloc.r_pcrel)
 223         {
 224           res->howto = &x86_64_howto_table[5];
 225           return true;
 226         }
 227       break;
 228     case BFD_MACH_O_X86_64_RELOC_TLV:
 229       if (reloc.r_length == 2 && reloc.r_pcrel && reloc.r_extern)
 230         {
 231           res->howto = &x86_64_howto_table[12];
 232           return true;
 233         }
 234       break;
 235     default:
 236       return false;
 237     }
 238   return false;
 239 }
 240
 241 static bool
 242 bfd_mach_o_x86_64_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 243 {
 244   rinfo->r_address = rel->address;
 245   rinfo->r_scattered = 0;
 246   switch (rel->howto->type)
 247     {
 248     case BFD_RELOC_32:
 249       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 250       rinfo->r_pcrel = 0;
 251       rinfo->r_length = 2;
 252       break;
 253     case BFD_RELOC_64:
 254       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_UNSIGNED;
 255       rinfo->r_pcrel = 0;
 256       rinfo->r_length = 3;
 257       break;
 258     case BFD_RELOC_32_PCREL:
 259       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED;
 260       rinfo->r_pcrel = 1;
 261       rinfo->r_length = 2;
 262       break;
 263     case BFD_RELOC_MACH_O_X86_64_PCREL32_1:
 264       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_1;
 265       rinfo->r_pcrel = 1;
 266       rinfo->r_length = 2;
 267       break;
 268     case BFD_RELOC_MACH_O_X86_64_PCREL32_2:
 269       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_2;
 270       rinfo->r_pcrel = 1;
 271       rinfo->r_length = 2;
 272       break;
 273     case BFD_RELOC_MACH_O_X86_64_PCREL32_4:
 274       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SIGNED_4;
 275       rinfo->r_pcrel = 1;
 276       rinfo->r_length = 2;
 277       break;
 278     case BFD_RELOC_MACH_O_X86_64_BRANCH32:
 279       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_BRANCH;
 280       rinfo->r_pcrel = 1;
 281       rinfo->r_length = 2;
 282       break;
 283     case BFD_RELOC_MACH_O_SUBTRACTOR32:
 284       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 285       rinfo->r_pcrel = 0;
 286       rinfo->r_length = 2;
 287       break;
 288     case BFD_RELOC_MACH_O_SUBTRACTOR64:
 289       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_SUBTRACTOR;
 290       rinfo->r_pcrel = 0;
 291       rinfo->r_length = 3;
 292       break;
 293     case BFD_RELOC_MACH_O_X86_64_GOT:
 294       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT;
 295       rinfo->r_pcrel = 1;
 296       rinfo->r_length = 2;
 297       break;
 298     case BFD_RELOC_MACH_O_X86_64_GOT_LOAD:
 299       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_GOT_LOAD;
 300       rinfo->r_pcrel = 1;
 301       rinfo->r_length = 2;
 302       break;
 303     case BFD_RELOC_MACH_O_X86_64_TLV:
 304       rinfo->r_type = BFD_MACH_O_X86_64_RELOC_TLV;
 305       rinfo->r_pcrel = 1;
 306       rinfo->r_length = 2;
 307       break;
 308     default:
 309       return false;
 310     }
 311   if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 312     {
 313       rinfo->r_extern = 0;
 314       rinfo->r_value =
 315         (*rel->sym_ptr_ptr)->section->output_section->target_index;
 316     }
 317   else
 318     {
 319       rinfo->r_extern = 1;
 320       rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 321     }
 322   return true;
 323 }
 324
 325 static reloc_howto_type *
 326 bfd_mach_o_x86_64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 327                                          bfd_reloc_code_real_type code)
 328 {
 329   unsigned int i;
 330
 331   for (i = 0;
 332        i < sizeof (x86_64_howto_table) / sizeof (*x86_64_howto_table);
 333        i++)
 334     if (code == x86_64_howto_table[i].type)
 335       return &x86_64_howto_table[i];
 336   return NULL;
 337 }
 338
 339 static reloc_howto_type *
 340 bfd_mach_o_x86_64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 341                                          const char *name ATTRIBUTE_UNUSED)
 342 {
 343   return NULL;
 344 }
 345
 346 static bool
 347 bfd_mach_o_section_type_valid_for_x86_64 (unsigned long val)
 348 {
 349   if (val == BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS
 350       || val == BFD_MACH_O_S_LAZY_SYMBOL_POINTERS
 351       || val == BFD_MACH_O_S_SYMBOL_STUBS)
 352     return false;
 353   return true;
 354 }
 355
 356 /* We want to bump the alignment of some sections.  */
 357 static const mach_o_section_name_xlat text_section_names_xlat[] =
 358   {
 359     {   ".eh_frame",                            "__eh_frame",
 360         SEC_READONLY | SEC_DATA | SEC_LOAD,     BFD_MACH_O_S_COALESCED,
 361         BFD_MACH_O_S_ATTR_LIVE_SUPPORT
 362         | BFD_MACH_O_S_ATTR_STRIP_STATIC_SYMS
 363         | BFD_MACH_O_S_ATTR_NO_TOC,             3},
 364     { NULL, NULL, 0, 0, 0, 0}
 365   };
 366
 367 const mach_o_segment_name_xlat mach_o_x86_64_segsec_names_xlat[] =
 368   {
 369     { "__TEXT", text_section_names_xlat },
 370     { NULL, NULL }
 371   };
 372
 373 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_x86_64_canonicalize_one_reloc
 374 #define bfd_mach_o_swap_reloc_out bfd_mach_o_x86_64_swap_reloc_out
 375
 376 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_x86_64_bfd_reloc_type_lookup
 377 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_x86_64_bfd_reloc_name_lookup
 378 #define bfd_mach_o_print_thread NULL
 379 #define bfd_mach_o_tgt_seg_table mach_o_x86_64_segsec_names_xlat
 380 #define bfd_mach_o_section_type_valid_for_tgt bfd_mach_o_section_type_valid_for_x86_64
 381
 382 #define TARGET_NAME             x86_64_mach_o_vec
 383 #define TARGET_STRING           "mach-o-x86-64"
 384 #define TARGET_ARCHITECTURE     bfd_arch_i386
 385 #define TARGET_PAGESIZE         4096
 386 #define TARGET_BIG_ENDIAN       0
 387 #define TARGET_ARCHIVE          0
 388 #define TARGET_PRIORITY         0
 389 #include "mach-o-target.c"