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 =
 214             (*rel->sym_ptr_ptr)->section->output_section->target_index;
 215         }
 216       else
 217         {
 218           rinfo->r_extern = 1;
 219           rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 220         }
 221       break;
 222     case BFD_RELOC_MACH_O_SECTDIFF:
 223       rinfo->r_scattered = 1;
 224       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
 225       rinfo->r_pcrel = 0;
 226       rinfo->r_length = rel->howto->size;
 227       rinfo->r_extern = 0;
 228       rinfo->r_value = rel->addend;
 229       break;
 230     case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
 231       rinfo->r_scattered = 1;
 232       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;
 233       rinfo->r_pcrel = 0;
 234       rinfo->r_length = rel->howto->size;
 235       rinfo->r_extern = 0;
 236       rinfo->r_value = rel->addend;
 237       break;
 238     case BFD_RELOC_MACH_O_PAIR:
 239       rinfo->r_address = 0;
 240       rinfo->r_scattered = 1;
 241       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
 242       rinfo->r_pcrel = 0;
 243       rinfo->r_length = rel->howto->size;
 244       rinfo->r_extern = 0;
 245       rinfo->r_value = rel->addend;
 246       break;
 247     default:
 248       return FALSE;
 249     }
 250   return TRUE;
 251 }
 252
 253 static reloc_howto_type *
 254 bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 255                                        bfd_reloc_code_real_type code)
 256 {
 257   unsigned int i;
 258
 259   for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)
 260     if (code == i386_howto_table[i].type)
 261       return &i386_howto_table[i];
 262   return NULL;
 263 }
 264
 265 static reloc_howto_type *
 266 bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 267                                        const char *name ATTRIBUTE_UNUSED)
 268 {
 269   return NULL;
 270 }
 271
 272 static bfd_boolean
 273 bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
 274                               void *vfile, char *buf)
 275 {
 276   FILE *file = (FILE *)vfile;
 277
 278   switch (thread->flavour)
 279     {
 280     case BFD_MACH_O_x86_THREAD_STATE:
 281       if (thread->size < (8 + 16 * 4))
 282         return FALSE;
 283       fprintf (file, "   x86_THREAD_STATE:\n");
 284       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 285                (unsigned long)bfd_get_32 (abfd, buf + 0),
 286                (unsigned long)bfd_get_32 (abfd, buf + 4));
 287       fprintf (file, "     eax: %08lx  ebx: %08lx  ecx: %08lx  edx: %08lx\n",
 288                (unsigned long)bfd_get_32 (abfd, buf + 8),
 289                (unsigned long)bfd_get_32 (abfd, buf + 12),
 290                (unsigned long)bfd_get_32 (abfd, buf + 16),
 291                (unsigned long)bfd_get_32 (abfd, buf + 20));
 292       fprintf (file, "     edi: %08lx  esi: %08lx  ebp: %08lx  esp: %08lx\n",
 293                (unsigned long)bfd_get_32 (abfd, buf + 24),
 294                (unsigned long)bfd_get_32 (abfd, buf + 28),
 295                (unsigned long)bfd_get_32 (abfd, buf + 32),
 296                (unsigned long)bfd_get_32 (abfd, buf + 36));
 297       fprintf (file, "      ss: %08lx  flg: %08lx  eip: %08lx   cs: %08lx\n",
 298                (unsigned long)bfd_get_32 (abfd, buf + 40),
 299                (unsigned long)bfd_get_32 (abfd, buf + 44),
 300                (unsigned long)bfd_get_32 (abfd, buf + 48),
 301                (unsigned long)bfd_get_32 (abfd, buf + 52));
 302       fprintf (file, "      ds: %08lx   es: %08lx   fs: %08lx   gs: %08lx\n",
 303                (unsigned long)bfd_get_32 (abfd, buf + 56),
 304                (unsigned long)bfd_get_32 (abfd, buf + 60),
 305                (unsigned long)bfd_get_32 (abfd, buf + 64),
 306                (unsigned long)bfd_get_32 (abfd, buf + 68));
 307       return TRUE;
 308     case BFD_MACH_O_x86_FLOAT_STATE:
 309       if (thread->size < 8)
 310         return FALSE;
 311       fprintf (file, "   x86_FLOAT_STATE:\n");
 312       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 313                (unsigned long)bfd_get_32 (abfd, buf + 0),
 314                (unsigned long)bfd_get_32 (abfd, buf + 4));
 315       return TRUE;
 316     case BFD_MACH_O_x86_EXCEPTION_STATE:
 317       if (thread->size < 8 + 3 * 4)
 318         return FALSE;
 319       fprintf (file, "   x86_EXCEPTION_STATE:\n");
 320       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 321                (unsigned long)bfd_get_32 (abfd, buf + 0),
 322                (unsigned long)bfd_get_32 (abfd, buf + 4));
 323       fprintf (file, "    trapno: %08lx  err: %08lx  faultaddr: %08lx\n",
 324                (unsigned long)bfd_get_32 (abfd, buf + 8),
 325                (unsigned long)bfd_get_32 (abfd, buf + 12),
 326                (unsigned long)bfd_get_32 (abfd, buf + 16));
 327       return TRUE;
 328     default:
 329       break;
 330     }
 331   return FALSE;
 332 }
 333
 334 static const mach_o_section_name_xlat text_section_names_xlat[] =
 335   {
 336     {   ".symbol_stub",                 "__symbol_stub",
 337         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 338         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 339                                         0},
 340     {   ".picsymbol_stub",              "__picsymbol_stub",
 341         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 342         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 343                                         0},
 344     { NULL, NULL, 0, 0, 0, 0}
 345   };
 346
 347 static const mach_o_section_name_xlat data_section_names_xlat[] =
 348   {
 349     /* The first two are recognized by i386, but not emitted for x86 by
 350        modern GCC.  */
 351     {   ".non_lazy_symbol_pointer",     "__nl_symbol_ptr",
 352         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 353         BFD_MACH_O_S_ATTR_NONE,         2},
 354     {   ".lazy_symbol_pointer",         "__la_symbol_ptr",
 355         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 356         BFD_MACH_O_S_ATTR_NONE,         2},
 357     {   ".lazy_symbol_pointer2",        "__la_sym_ptr2",
 358         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 359         BFD_MACH_O_S_ATTR_NONE,         2},
 360     {   ".lazy_symbol_pointer3",        "__la_sym_ptr3",
 361         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 362         BFD_MACH_O_S_ATTR_NONE,         2},
 363     { NULL, NULL, 0, 0, 0, 0}
 364   };
 365
 366 static const mach_o_section_name_xlat import_section_names_xlat[] =
 367   {
 368     {   ".picsymbol_stub3",             "__jump_table",
 369         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 370         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
 371         | BFD_MACH_O_S_SELF_MODIFYING_CODE,
 372                                         6},
 373     {   ".non_lazy_symbol_pointer_x86", "__pointers",
 374         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 375         BFD_MACH_O_S_ATTR_NONE,         2},
 376     { NULL, NULL, 0, 0, 0, 0}
 377   };
 378
 379 const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
 380   {
 381     { "__TEXT", text_section_names_xlat },
 382     { "__DATA", data_section_names_xlat },
 383     { "__IMPORT", import_section_names_xlat },
 384     { NULL, NULL }
 385   };
 386
 387 #define bfd_mach_o_swap_reloc_in bfd_mach_o_i386_swap_reloc_in
 388 #define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
 389 #define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
 390
 391 #define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
 392 #define bfd_mach_o_section_type_valid_for_tgt NULL
 393
 394 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
 395 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
 396
 397 #define TARGET_NAME             i386_mach_o_vec
 398 #define TARGET_STRING           "mach-o-i386"
 399 #define TARGET_ARCHITECTURE     bfd_arch_i386
 400 #define TARGET_PAGESIZE         4096
 401 #define TARGET_BIG_ENDIAN       0
 402 #define TARGET_ARCHIVE          0
 403 #define TARGET_PRIORITY         0
 404 #include "mach-o-target.c"