bfd/mach-o-i386.c

   1 /* Intel i386 Mach-O support for BFD.
   2    Copyright (C) 2009-2017 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/reloc.h"
  27
  28 #define bfd_mach_o_object_p bfd_mach_o_i386_object_p
  29 #define bfd_mach_o_core_p bfd_mach_o_i386_core_p
  30 #define bfd_mach_o_mkobject bfd_mach_o_i386_mkobject
  31
  32 static const bfd_target *
  33 bfd_mach_o_i386_object_p (bfd *abfd)
  34 {
  35   return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_I386);
  36 }
  37
  38 static const bfd_target *
  39 bfd_mach_o_i386_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_I386);
  43 }
  44
  45 static bfd_boolean
  46 bfd_mach_o_i386_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;
  55   mdata->header.cputype = BFD_MACH_O_CPU_TYPE_I386;
  56   mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;
  57   mdata->header.byteorder = BFD_ENDIAN_LITTLE;
  58   mdata->header.version = 1;
  59
  60   return TRUE;
  61 }
  62
  63 static reloc_howto_type i386_howto_table[]=
  64 {
  65   /* 0 */
  66   HOWTO(BFD_RELOC_32, 0, 2, 32, FALSE, 0,
  67         complain_overflow_bitfield,
  68         NULL, "32",
  69         FALSE, 0xffffffff, 0xffffffff, FALSE),
  70   HOWTO(BFD_RELOC_16, 0, 1, 16, FALSE, 0,
  71         complain_overflow_bitfield,
  72         NULL, "16",
  73         FALSE, 0xffff, 0xffff, FALSE),
  74   HOWTO(BFD_RELOC_8, 0, 0, 8, FALSE, 0,
  75         complain_overflow_bitfield,
  76         NULL, "8",
  77         FALSE, 0xff, 0xff, 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   /* 4 */
  83   HOWTO(BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0,
  84         complain_overflow_bitfield,
  85         NULL, "DISP16",
  86         FALSE, 0xffff, 0xffff, TRUE),
  87   HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, FALSE, 0,
  88         complain_overflow_bitfield,
  89         NULL, "SECTDIFF_32",
  90         FALSE, 0xffffffff, 0xffffffff, FALSE),
  91   HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, FALSE, 0,
  92         complain_overflow_bitfield,
  93         NULL, "LSECTDIFF_32",
  94         FALSE, 0xffffffff, 0xffffffff, FALSE),
  95   HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 2, 32, FALSE, 0,
  96         complain_overflow_bitfield,
  97         NULL, "PAIR_32",
  98         FALSE, 0xffffffff, 0xffffffff, FALSE),
  99   /* 8 */
 100   HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, FALSE, 0,
 101         complain_overflow_bitfield,
 102         NULL, "SECTDIFF_16",
 103         FALSE, 0xffff, 0xffff, FALSE),
 104   HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, FALSE, 0,
 105         complain_overflow_bitfield,
 106         NULL, "LSECTDIFF_16",
 107         FALSE, 0xffff, 0xffff, FALSE),
 108   HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 1, 16, FALSE, 0,
 109         complain_overflow_bitfield,
 110         NULL, "PAIR_16",
 111         FALSE, 0xffff, 0xffff, FALSE),
 112 };
 113
 114 static bfd_boolean
 115 bfd_mach_o_i386_canonicalize_one_reloc (bfd *abfd,
 116                                         struct mach_o_reloc_info_external *raw,
 117                                         arelent *res, asymbol **syms)
 118 {
 119   bfd_mach_o_reloc_info reloc;
 120
 121   if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
 122     return FALSE;
 123
 124   if (reloc.r_scattered)
 125     {
 126       switch (reloc.r_type)
 127         {
 128         case BFD_MACH_O_GENERIC_RELOC_PAIR:
 129           if (reloc.r_length == 2)
 130             {
 131               res->howto = &i386_howto_table[7];
 132               res->address = res[-1].address;
 133               return TRUE;
 134             }
 135           else if (reloc.r_length == 1)
 136             {
 137               res->howto = &i386_howto_table[10];
 138               res->address = res[-1].address;
 139               return TRUE;
 140             }
 141           return FALSE;
 142         case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:
 143           if (reloc.r_length == 2)
 144             {
 145               res->howto = &i386_howto_table[5];
 146               return TRUE;
 147             }
 148           else if (reloc.r_length == 1)
 149             {
 150               res->howto = &i386_howto_table[8];
 151               return TRUE;
 152             }
 153           return FALSE;
 154         case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:
 155           if (reloc.r_length == 2)
 156             {
 157               res->howto = &i386_howto_table[6];
 158               return TRUE;
 159             }
 160           else if (reloc.r_length == 1)
 161             {
 162               res->howto = &i386_howto_table[9];
 163               return TRUE;
 164             }
 165           return FALSE;
 166         default:
 167           break;
 168         }
 169     }
 170   else
 171     {
 172       switch (reloc.r_type)
 173         {
 174         case BFD_MACH_O_GENERIC_RELOC_VANILLA:
 175           switch ((reloc.r_length << 1) | reloc.r_pcrel)
 176             {
 177             case 0: /* len = 0, pcrel = 0  */
 178               res->howto = &i386_howto_table[2];
 179               return TRUE;
 180             case 2: /* len = 1, pcrel = 0  */
 181               res->howto = &i386_howto_table[1];
 182               return TRUE;
 183             case 3: /* len = 1, pcrel = 1  */
 184               res->howto = &i386_howto_table[4];
 185               return TRUE;
 186             case 4: /* len = 2, pcrel = 0  */
 187               res->howto = &i386_howto_table[0];
 188               return TRUE;
 189             case 5: /* len = 2, pcrel = 1  */
 190               res->howto = &i386_howto_table[3];
 191               return TRUE;
 192             default:
 193               return FALSE;
 194             }
 195         default:
 196           break;
 197         }
 198     }
 199   return FALSE;
 200 }
 201
 202 static bfd_boolean
 203 bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 204 {
 205   rinfo->r_address = rel->address;
 206   switch (rel->howto->type)
 207     {
 208     case BFD_RELOC_32:
 209     case BFD_RELOC_32_PCREL:
 210     case BFD_RELOC_16:
 211     case BFD_RELOC_16_PCREL:
 212     case BFD_RELOC_8:
 213       rinfo->r_scattered = 0;
 214       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;
 215       rinfo->r_pcrel = rel->howto->pc_relative;
 216       rinfo->r_length = rel->howto->size; /* Correct in practice.  */
 217       if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 218         {
 219           rinfo->r_extern = 0;
 220           rinfo->r_value =
 221             (*rel->sym_ptr_ptr)->section->output_section->target_index;
 222         }
 223       else
 224         {
 225           rinfo->r_extern = 1;
 226           rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 227         }
 228       break;
 229     case BFD_RELOC_MACH_O_SECTDIFF:
 230       rinfo->r_scattered = 1;
 231       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
 232       rinfo->r_pcrel = 0;
 233       rinfo->r_length = rel->howto->size;
 234       rinfo->r_extern = 0;
 235       rinfo->r_value = rel->addend;
 236       break;
 237     case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
 238       rinfo->r_scattered = 1;
 239       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;
 240       rinfo->r_pcrel = 0;
 241       rinfo->r_length = rel->howto->size;
 242       rinfo->r_extern = 0;
 243       rinfo->r_value = rel->addend;
 244       break;
 245     case BFD_RELOC_MACH_O_PAIR:
 246       rinfo->r_address = 0;
 247       rinfo->r_scattered = 1;
 248       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
 249       rinfo->r_pcrel = 0;
 250       rinfo->r_length = rel->howto->size;
 251       rinfo->r_extern = 0;
 252       rinfo->r_value = rel->addend;
 253       break;
 254     default:
 255       return FALSE;
 256     }
 257   return TRUE;
 258 }
 259
 260 static reloc_howto_type *
 261 bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 262                                        bfd_reloc_code_real_type code)
 263 {
 264   unsigned int i;
 265
 266   for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)
 267     if (code == i386_howto_table[i].type)
 268       return &i386_howto_table[i];
 269   return NULL;
 270 }
 271
 272 static reloc_howto_type *
 273 bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 274                                        const char *name ATTRIBUTE_UNUSED)
 275 {
 276   return NULL;
 277 }
 278
 279 static bfd_boolean
 280 bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
 281                               void *vfile, char *buf)
 282 {
 283   FILE *file = (FILE *)vfile;
 284
 285   switch (thread->flavour)
 286     {
 287     case BFD_MACH_O_x86_THREAD_STATE:
 288       if (thread->size < (8 + 16 * 4))
 289         return FALSE;
 290       fprintf (file, "   x86_THREAD_STATE:\n");
 291       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 292                (unsigned long)bfd_get_32 (abfd, buf + 0),
 293                (unsigned long)bfd_get_32 (abfd, buf + 4));
 294       fprintf (file, "     eax: %08lx  ebx: %08lx  ecx: %08lx  edx: %08lx\n",
 295                (unsigned long)bfd_get_32 (abfd, buf + 8),
 296                (unsigned long)bfd_get_32 (abfd, buf + 12),
 297                (unsigned long)bfd_get_32 (abfd, buf + 16),
 298                (unsigned long)bfd_get_32 (abfd, buf + 20));
 299       fprintf (file, "     edi: %08lx  esi: %08lx  ebp: %08lx  esp: %08lx\n",
 300                (unsigned long)bfd_get_32 (abfd, buf + 24),
 301                (unsigned long)bfd_get_32 (abfd, buf + 28),
 302                (unsigned long)bfd_get_32 (abfd, buf + 32),
 303                (unsigned long)bfd_get_32 (abfd, buf + 36));
 304       fprintf (file, "      ss: %08lx  flg: %08lx  eip: %08lx   cs: %08lx\n",
 305                (unsigned long)bfd_get_32 (abfd, buf + 40),
 306                (unsigned long)bfd_get_32 (abfd, buf + 44),
 307                (unsigned long)bfd_get_32 (abfd, buf + 48),
 308                (unsigned long)bfd_get_32 (abfd, buf + 52));
 309       fprintf (file, "      ds: %08lx   es: %08lx   fs: %08lx   gs: %08lx\n",
 310                (unsigned long)bfd_get_32 (abfd, buf + 56),
 311                (unsigned long)bfd_get_32 (abfd, buf + 60),
 312                (unsigned long)bfd_get_32 (abfd, buf + 64),
 313                (unsigned long)bfd_get_32 (abfd, buf + 68));
 314       return TRUE;
 315     case BFD_MACH_O_x86_FLOAT_STATE:
 316       if (thread->size < 8)
 317         return FALSE;
 318       fprintf (file, "   x86_FLOAT_STATE:\n");
 319       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 320                (unsigned long)bfd_get_32 (abfd, buf + 0),
 321                (unsigned long)bfd_get_32 (abfd, buf + 4));
 322       return TRUE;
 323     case BFD_MACH_O_x86_EXCEPTION_STATE:
 324       if (thread->size < 8 + 3 * 4)
 325         return FALSE;
 326       fprintf (file, "   x86_EXCEPTION_STATE:\n");
 327       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 328                (unsigned long)bfd_get_32 (abfd, buf + 0),
 329                (unsigned long)bfd_get_32 (abfd, buf + 4));
 330       fprintf (file, "    trapno: %08lx  err: %08lx  faultaddr: %08lx\n",
 331                (unsigned long)bfd_get_32 (abfd, buf + 8),
 332                (unsigned long)bfd_get_32 (abfd, buf + 12),
 333                (unsigned long)bfd_get_32 (abfd, buf + 16));
 334       return TRUE;
 335     default:
 336       break;
 337     }
 338   return FALSE;
 339 }
 340
 341 static const mach_o_section_name_xlat text_section_names_xlat[] =
 342   {
 343     {   ".symbol_stub",                 "__symbol_stub",
 344         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 345         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 346                                         0},
 347     {   ".picsymbol_stub",              "__picsymbol_stub",
 348         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 349         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 350                                         0},
 351     { NULL, NULL, 0, 0, 0, 0}
 352   };
 353
 354 static const mach_o_section_name_xlat data_section_names_xlat[] =
 355   {
 356     /* The first two are recognized by i386, but not emitted for x86 by
 357        modern GCC.  */
 358     {   ".non_lazy_symbol_pointer",     "__nl_symbol_ptr",
 359         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 360         BFD_MACH_O_S_ATTR_NONE,         2},
 361     {   ".lazy_symbol_pointer",         "__la_symbol_ptr",
 362         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 363         BFD_MACH_O_S_ATTR_NONE,         2},
 364     {   ".lazy_symbol_pointer2",        "__la_sym_ptr2",
 365         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 366         BFD_MACH_O_S_ATTR_NONE,         2},
 367     {   ".lazy_symbol_pointer3",        "__la_sym_ptr3",
 368         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 369         BFD_MACH_O_S_ATTR_NONE,         2},
 370     { NULL, NULL, 0, 0, 0, 0}
 371   };
 372
 373 static const mach_o_section_name_xlat import_section_names_xlat[] =
 374   {
 375     {   ".picsymbol_stub3",             "__jump_table",
 376         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 377         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
 378         | BFD_MACH_O_S_SELF_MODIFYING_CODE,
 379                                         6},
 380     {   ".non_lazy_symbol_pointer_x86", "__pointers",
 381         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 382         BFD_MACH_O_S_ATTR_NONE,         2},
 383     { NULL, NULL, 0, 0, 0, 0}
 384   };
 385
 386 const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
 387   {
 388     { "__TEXT", text_section_names_xlat },
 389     { "__DATA", data_section_names_xlat },
 390     { "__IMPORT", import_section_names_xlat },
 391     { NULL, NULL }
 392   };
 393
 394 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_i386_canonicalize_one_reloc
 395 #define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
 396 #define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
 397
 398 #define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
 399 #define bfd_mach_o_section_type_valid_for_tgt NULL
 400
 401 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
 402 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
 403
 404 #define TARGET_NAME             i386_mach_o_vec
 405 #define TARGET_STRING           "mach-o-i386"
 406 #define TARGET_ARCHITECTURE     bfd_arch_i386
 407 #define TARGET_PAGESIZE         4096
 408 #define TARGET_BIG_ENDIAN       0
 409 #define TARGET_ARCHIVE          0
 410 #define TARGET_PRIORITY         0
 411 #include "mach-o-target.c"