bfd/mach-o-i386.c

   1 /* Intel i386 Mach-O support for BFD.
   2    Copyright (C) 2009-2014 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, 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,
  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_swap_reloc_in (arelent *res, bfd_mach_o_reloc_info *reloc)
 116 {
 117   if (reloc->r_scattered)
 118     {
 119       switch (reloc->r_type)
 120         {
 121         case BFD_MACH_O_GENERIC_RELOC_PAIR:
 122           if (reloc->r_length == 2)
 123             {
 124               res->howto = &i386_howto_table[7];
 125               res->address = res[-1].address;
 126               return TRUE;
 127             }
 128           else if (reloc->r_length == 1)
 129             {
 130               res->howto = &i386_howto_table[10];
 131               res->address = res[-1].address;
 132               return TRUE;
 133             }
 134           return FALSE;
 135         case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:
 136           if (reloc->r_length == 2)
 137             {
 138               res->howto = &i386_howto_table[5];
 139               return TRUE;
 140             }
 141           else if (reloc->r_length == 1)
 142             {
 143               res->howto = &i386_howto_table[8];
 144               return TRUE;
 145             }
 146           return FALSE;
 147         case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:
 148           if (reloc->r_length == 2)
 149             {
 150               res->howto = &i386_howto_table[6];
 151               return TRUE;
 152             }
 153           else if (reloc->r_length == 1)
 154             {
 155               res->howto = &i386_howto_table[9];
 156               return TRUE;
 157             }
 158           return FALSE;
 159         default:
 160           return FALSE;
 161         }
 162     }
 163   else
 164     {
 165       switch (reloc->r_type)
 166         {
 167         case BFD_MACH_O_GENERIC_RELOC_VANILLA:
 168           switch ((reloc->r_length << 1) | reloc->r_pcrel)
 169             {
 170             case 0: /* len = 0, pcrel = 0  */
 171               res->howto = &i386_howto_table[2];
 172               return TRUE;
 173             case 2: /* len = 1, pcrel = 0  */
 174               res->howto = &i386_howto_table[1];
 175               return TRUE;
 176             case 3: /* len = 1, pcrel = 1  */
 177               res->howto = &i386_howto_table[4];
 178               return TRUE;
 179             case 4: /* len = 2, pcrel = 0  */
 180               res->howto = &i386_howto_table[0];
 181               return TRUE;
 182             case 5: /* len = 2, pcrel = 1  */
 183               res->howto = &i386_howto_table[3];
 184               return TRUE;
 185             default:
 186               return FALSE;
 187             }
 188           break;
 189         default:
 190           return FALSE;
 191         }
 192     }
 193 }
 194
 195 static bfd_boolean
 196 bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 197 {
 198   rinfo->r_address = rel->address;
 199   switch (rel->howto->type)
 200     {
 201     case BFD_RELOC_32:
 202     case BFD_RELOC_32_PCREL:
 203     case BFD_RELOC_16:
 204     case BFD_RELOC_16_PCREL:
 205     case BFD_RELOC_8:
 206       rinfo->r_scattered = 0;
 207       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;
 208       rinfo->r_pcrel = rel->howto->pc_relative;
 209       rinfo->r_length = rel->howto->size; /* Correct in practice.  */
 210       if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 211         {
 212           rinfo->r_extern = 0;
 213           rinfo->r_value = (*rel->sym_ptr_ptr)->section->target_index;
 214         }
 215       else
 216         {
 217           rinfo->r_extern = 1;
 218           rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 219         }
 220       break;
 221     case BFD_RELOC_MACH_O_SECTDIFF:
 222       rinfo->r_scattered = 1;
 223       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
 224       rinfo->r_pcrel = 0;
 225       rinfo->r_length = rel->howto->size;
 226       rinfo->r_extern = 0;
 227       rinfo->r_value = rel->addend;
 228       break;
 229     case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
 230       rinfo->r_scattered = 1;
 231       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_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_PAIR:
 238       rinfo->r_address = 0;
 239       rinfo->r_scattered = 1;
 240       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
 241       rinfo->r_pcrel = 0;
 242       rinfo->r_length = rel->howto->size;
 243       rinfo->r_extern = 0;
 244       rinfo->r_value = rel->addend;
 245       break;
 246     default:
 247       return FALSE;
 248     }
 249   return TRUE;
 250 }
 251
 252 static reloc_howto_type *
 253 bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 254                                        bfd_reloc_code_real_type code)
 255 {
 256   unsigned int i;
 257
 258   for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)
 259     if (code == i386_howto_table[i].type)
 260       return &i386_howto_table[i];
 261   return NULL;
 262 }
 263
 264 static reloc_howto_type *
 265 bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 266                                        const char *name ATTRIBUTE_UNUSED)
 267 {
 268   return NULL;
 269 }
 270
 271 static bfd_boolean
 272 bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
 273                               void *vfile, char *buf)
 274 {
 275   FILE *file = (FILE *)vfile;
 276
 277   switch (thread->flavour)
 278     {
 279     case BFD_MACH_O_x86_THREAD_STATE:
 280       if (thread->size < (8 + 16 * 4))
 281         return FALSE;
 282       fprintf (file, "   x86_THREAD_STATE:\n");
 283       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 284                (unsigned long)bfd_get_32 (abfd, buf + 0),
 285                (unsigned long)bfd_get_32 (abfd, buf + 4));
 286       fprintf (file, "     eax: %08lx  ebx: %08lx  ecx: %08lx  edx: %08lx\n",
 287                (unsigned long)bfd_get_32 (abfd, buf + 8),
 288                (unsigned long)bfd_get_32 (abfd, buf + 12),
 289                (unsigned long)bfd_get_32 (abfd, buf + 16),
 290                (unsigned long)bfd_get_32 (abfd, buf + 20));
 291       fprintf (file, "     edi: %08lx  esi: %08lx  ebp: %08lx  esp: %08lx\n",
 292                (unsigned long)bfd_get_32 (abfd, buf + 24),
 293                (unsigned long)bfd_get_32 (abfd, buf + 28),
 294                (unsigned long)bfd_get_32 (abfd, buf + 32),
 295                (unsigned long)bfd_get_32 (abfd, buf + 36));
 296       fprintf (file, "      ss: %08lx  flg: %08lx  eip: %08lx   cs: %08lx\n",
 297                (unsigned long)bfd_get_32 (abfd, buf + 40),
 298                (unsigned long)bfd_get_32 (abfd, buf + 44),
 299                (unsigned long)bfd_get_32 (abfd, buf + 48),
 300                (unsigned long)bfd_get_32 (abfd, buf + 52));
 301       fprintf (file, "      ds: %08lx   es: %08lx   fs: %08lx   gs: %08lx\n",
 302                (unsigned long)bfd_get_32 (abfd, buf + 56),
 303                (unsigned long)bfd_get_32 (abfd, buf + 60),
 304                (unsigned long)bfd_get_32 (abfd, buf + 64),
 305                (unsigned long)bfd_get_32 (abfd, buf + 68));
 306       return TRUE;
 307     case BFD_MACH_O_x86_FLOAT_STATE:
 308       if (thread->size < 8)
 309         return FALSE;
 310       fprintf (file, "   x86_FLOAT_STATE:\n");
 311       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 312                (unsigned long)bfd_get_32 (abfd, buf + 0),
 313                (unsigned long)bfd_get_32 (abfd, buf + 4));
 314       return TRUE;
 315     case BFD_MACH_O_x86_EXCEPTION_STATE:
 316       if (thread->size < 8 + 3 * 4)
 317         return FALSE;
 318       fprintf (file, "   x86_EXCEPTION_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       fprintf (file, "    trapno: %08lx  err: %08lx  faultaddr: %08lx\n",
 323                (unsigned long)bfd_get_32 (abfd, buf + 8),
 324                (unsigned long)bfd_get_32 (abfd, buf + 12),
 325                (unsigned long)bfd_get_32 (abfd, buf + 16));
 326       return TRUE;
 327     default:
 328       break;
 329     }
 330   return FALSE;
 331 }
 332
 333 static const mach_o_section_name_xlat text_section_names_xlat[] =
 334   {
 335     {   ".symbol_stub",                 "__symbol_stub",
 336         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 337         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 338                                         0},
 339     {   ".picsymbol_stub",              "__picsymbol_stub",
 340         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 341         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 342                                         0},
 343     { NULL, NULL, 0, 0, 0, 0}
 344   };
 345
 346 static const mach_o_section_name_xlat data_section_names_xlat[] =
 347   {
 348     /* The first two are recognized by i386, but not emitted for x86 by
 349        modern GCC.  */
 350     {   ".non_lazy_symbol_pointer",     "__nl_symbol_ptr",
 351         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 352         BFD_MACH_O_S_ATTR_NONE,         2},
 353     {   ".lazy_symbol_pointer",         "__la_symbol_ptr",
 354         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 355         BFD_MACH_O_S_ATTR_NONE,         2},
 356     {   ".lazy_symbol_pointer2",        "__la_sym_ptr2",
 357         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 358         BFD_MACH_O_S_ATTR_NONE,         2},
 359     {   ".lazy_symbol_pointer3",        "__la_sym_ptr3",
 360         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 361         BFD_MACH_O_S_ATTR_NONE,         2},
 362     { NULL, NULL, 0, 0, 0, 0}
 363   };
 364
 365 static const mach_o_section_name_xlat import_section_names_xlat[] =
 366   {
 367     {   ".picsymbol_stub3",             "__jump_table",
 368         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 369         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
 370         | BFD_MACH_O_S_SELF_MODIFYING_CODE,
 371                                         6},
 372     {   ".non_lazy_symbol_pointer_x86", "__pointers",
 373         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 374         BFD_MACH_O_S_ATTR_NONE,         2},
 375     { NULL, NULL, 0, 0, 0, 0}
 376   };
 377
 378 const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
 379   {
 380     { "__TEXT", text_section_names_xlat },
 381     { "__DATA", data_section_names_xlat },
 382     { "__IMPORT", import_section_names_xlat },
 383     { NULL, NULL }
 384   };
 385
 386 #define bfd_mach_o_swap_reloc_in bfd_mach_o_i386_swap_reloc_in
 387 #define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
 388 #define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
 389
 390 #define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
 391 #define bfd_mach_o_section_type_valid_for_tgt NULL
 392
 393 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
 394 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
 395
 396 #define TARGET_NAME             mach_o_i386_vec
 397 #define TARGET_STRING           "mach-o-i386"
 398 #define TARGET_ARCHITECTURE     bfd_arch_i386
 399 #define TARGET_BIG_ENDIAN       0
 400 #define TARGET_ARCHIVE          0
 401 #define TARGET_PRIORITY         0
 402 #include "mach-o-target.c"