bfd/mach-o-i386.c

   1 /* Intel i386 Mach-O support for BFD.
   2    Copyright 2009
   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/reloc.h"
  28
  29 #define bfd_mach_o_object_p bfd_mach_o_i386_object_p
  30 #define bfd_mach_o_core_p bfd_mach_o_i386_core_p
  31 #define bfd_mach_o_mkobject bfd_mach_o_i386_mkobject
  32
  33 static const bfd_target *
  34 bfd_mach_o_i386_object_p (bfd *abfd)
  35 {
  36   return bfd_mach_o_header_p (abfd, 0, BFD_MACH_O_CPU_TYPE_I386);
  37 }
  38
  39 static const bfd_target *
  40 bfd_mach_o_i386_core_p (bfd *abfd)
  41 {
  42   return bfd_mach_o_header_p (abfd,
  43                               BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_I386);
  44 }
  45
  46 static bfd_boolean
  47 bfd_mach_o_i386_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;
  56   mdata->header.cputype = BFD_MACH_O_CPU_TYPE_I386;
  57   mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;
  58   mdata->header.byteorder = BFD_ENDIAN_LITTLE;
  59   mdata->header.version = 1;
  60
  61   return TRUE;
  62 }
  63
  64 static reloc_howto_type i386_howto_table[]=
  65 {
  66   /* 0 */
  67   HOWTO(BFD_RELOC_32, 0, 2, 32, FALSE, 0,
  68         complain_overflow_bitfield,
  69         NULL, "32",
  70         FALSE, 0xffffffff, 0xffffffff, FALSE),
  71   HOWTO(BFD_RELOC_16, 0, 1, 16, FALSE, 0,
  72         complain_overflow_bitfield,
  73         NULL, "16",
  74         FALSE, 0xffff, 0xffff, FALSE),
  75   HOWTO(BFD_RELOC_8, 0, 0, 8, FALSE, 0,
  76         complain_overflow_bitfield,
  77         NULL, "8",
  78         FALSE, 0xff, 0xff, FALSE),
  79   HOWTO(BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,
  80         complain_overflow_bitfield,
  81         NULL, "DISP32",
  82         FALSE, 0xffffffff, 0xffffffff, TRUE),
  83   /* 4 */
  84   HOWTO(BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0,
  85         complain_overflow_bitfield,
  86         NULL, "DISP16",
  87         FALSE, 0xffff, 0xffff, TRUE),
  88   HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, FALSE, 0,
  89         complain_overflow_bitfield,
  90         NULL, "SECTDIFF_32",
  91         FALSE, 0xffffffff, 0xffffffff, FALSE),
  92   HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, FALSE, 0,
  93         complain_overflow_bitfield,
  94         NULL, "LSECTDIFF_32",
  95         FALSE, 0xffffffff, 0xffffffff, FALSE),
  96   HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 2, 32, FALSE, 0,
  97         complain_overflow_bitfield,
  98         NULL, "PAIR_32",
  99         FALSE, 0xffffffff, 0xffffffff, FALSE),
 100 };
 101
 102 static bfd_boolean
 103 bfd_mach_o_i386_swap_reloc_in (arelent *res, bfd_mach_o_reloc_info *reloc)
 104 {
 105   if (reloc->r_scattered)
 106     {
 107       switch (reloc->r_type)
 108         {
 109         case BFD_MACH_O_GENERIC_RELOC_PAIR:
 110           if (reloc->r_length != 2)
 111             return FALSE;
 112           res->howto = &i386_howto_table[7];
 113           res->address = res[-1].address;
 114           return TRUE;
 115         case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:
 116           if (reloc->r_length != 2)
 117             return FALSE;
 118           res->howto = &i386_howto_table[5];
 119           return TRUE;
 120         case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:
 121           if (reloc->r_length != 2)
 122             return FALSE;
 123           res->howto = &i386_howto_table[6];
 124           return TRUE;
 125         default:
 126           return FALSE;
 127         }
 128     }
 129   else
 130     {
 131       switch (reloc->r_type)
 132         {
 133         case BFD_MACH_O_GENERIC_RELOC_VANILLA:
 134           switch ((reloc->r_length << 1) | reloc->r_pcrel)
 135             {
 136             case 0: /* len = 0, pcrel = 0  */
 137               res->howto = &i386_howto_table[2];
 138               return TRUE;
 139             case 2: /* len = 1, pcrel = 0  */
 140               res->howto = &i386_howto_table[1];
 141               return TRUE;
 142             case 3: /* len = 1, pcrel = 1  */
 143               res->howto = &i386_howto_table[4];
 144               return TRUE;
 145             case 4: /* len = 2, pcrel = 0  */
 146               res->howto = &i386_howto_table[0];
 147               return TRUE;
 148             case 5: /* len = 2, pcrel = 1  */
 149               res->howto = &i386_howto_table[3];
 150               return TRUE;
 151             default:
 152               return FALSE;
 153             }
 154           break;
 155         default:
 156           return FALSE;
 157         }
 158     }
 159 }
 160
 161 static bfd_boolean
 162 bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
 163 {
 164   rinfo->r_address = rel->address;
 165   switch (rel->howto->type)
 166     {
 167     case BFD_RELOC_32:
 168     case BFD_RELOC_32_PCREL:
 169     case BFD_RELOC_16:
 170     case BFD_RELOC_16_PCREL:
 171     case BFD_RELOC_8:
 172       rinfo->r_scattered = 0;
 173       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;
 174       rinfo->r_pcrel = rel->howto->pc_relative;
 175       rinfo->r_length = rel->howto->size; /* Correct in practice.  */
 176       if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
 177         {
 178           rinfo->r_extern = 0;
 179           rinfo->r_value = (*rel->sym_ptr_ptr)->section->target_index;
 180         }
 181       else
 182         {
 183           rinfo->r_extern = 1;
 184           rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
 185         }
 186       break;
 187     case BFD_RELOC_MACH_O_SECTDIFF:
 188       rinfo->r_scattered = 1;
 189       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
 190       rinfo->r_pcrel = 0;
 191       rinfo->r_length = 2;
 192       rinfo->r_extern = 0;
 193       rinfo->r_value = (*rel->sym_ptr_ptr)->value
 194         + (*rel->sym_ptr_ptr)->section->vma;
 195       break;
 196     case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
 197       rinfo->r_scattered = 1;
 198       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;
 199       rinfo->r_pcrel = 0;
 200       rinfo->r_length = 2;
 201       rinfo->r_extern = 0;
 202       rinfo->r_value = (*rel->sym_ptr_ptr)->value
 203         + (*rel->sym_ptr_ptr)->section->vma;
 204       break;
 205     case BFD_RELOC_MACH_O_PAIR:
 206       rinfo->r_address = 0;
 207       rinfo->r_scattered = 1;
 208       rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
 209       rinfo->r_pcrel = 0;
 210       rinfo->r_length = 2;
 211       rinfo->r_extern = 0;
 212       rinfo->r_value = (*rel->sym_ptr_ptr)->value
 213         + (*rel->sym_ptr_ptr)->section->vma;
 214       break;
 215     default:
 216       return FALSE;
 217     }
 218   return TRUE;
 219 }
 220
 221 static reloc_howto_type *
 222 bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 223                                        bfd_reloc_code_real_type code)
 224 {
 225   unsigned int i;
 226
 227   for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)
 228     if (code == i386_howto_table[i].type)
 229       return &i386_howto_table[i];
 230   return NULL;
 231 }
 232
 233 static reloc_howto_type *
 234 bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 235                                        const char *name ATTRIBUTE_UNUSED)
 236 {
 237   return NULL;
 238 }
 239
 240 static bfd_boolean
 241 bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
 242                               void *vfile, char *buf)
 243 {
 244   FILE *file = (FILE *)vfile;
 245
 246   switch (thread->flavour)
 247     {
 248     case BFD_MACH_O_x86_THREAD_STATE:
 249       if (thread->size < (8 + 16 * 4))
 250         return FALSE;
 251       fprintf (file, "   x86_THREAD_STATE:\n");
 252       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 253                (unsigned long)bfd_get_32 (abfd, buf + 0),
 254                (unsigned long)bfd_get_32 (abfd, buf + 4));
 255       fprintf (file, "     eax: %08lx  ebx: %08lx  ecx: %08lx  edx: %08lx\n",
 256                (unsigned long)bfd_get_32 (abfd, buf + 8),
 257                (unsigned long)bfd_get_32 (abfd, buf + 12),
 258                (unsigned long)bfd_get_32 (abfd, buf + 16),
 259                (unsigned long)bfd_get_32 (abfd, buf + 20));
 260       fprintf (file, "     edi: %08lx  esi: %08lx  ebp: %08lx  esp: %08lx\n",
 261                (unsigned long)bfd_get_32 (abfd, buf + 24),
 262                (unsigned long)bfd_get_32 (abfd, buf + 28),
 263                (unsigned long)bfd_get_32 (abfd, buf + 32),
 264                (unsigned long)bfd_get_32 (abfd, buf + 36));
 265       fprintf (file, "      ss: %08lx  flg: %08lx  eip: %08lx   cs: %08lx\n",
 266                (unsigned long)bfd_get_32 (abfd, buf + 40),
 267                (unsigned long)bfd_get_32 (abfd, buf + 44),
 268                (unsigned long)bfd_get_32 (abfd, buf + 48),
 269                (unsigned long)bfd_get_32 (abfd, buf + 52));
 270       fprintf (file, "      ds: %08lx   es: %08lx   fs: %08lx   gs: %08lx\n",
 271                (unsigned long)bfd_get_32 (abfd, buf + 56),
 272                (unsigned long)bfd_get_32 (abfd, buf + 60),
 273                (unsigned long)bfd_get_32 (abfd, buf + 64),
 274                (unsigned long)bfd_get_32 (abfd, buf + 68));
 275       return TRUE;
 276     case BFD_MACH_O_x86_FLOAT_STATE:
 277       if (thread->size < 8)
 278         return FALSE;
 279       fprintf (file, "   x86_FLOAT_STATE:\n");
 280       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 281                (unsigned long)bfd_get_32 (abfd, buf + 0),
 282                (unsigned long)bfd_get_32 (abfd, buf + 4));
 283       return TRUE;
 284     case BFD_MACH_O_x86_EXCEPTION_STATE:
 285       if (thread->size < 8 + 3 * 4)
 286         return FALSE;
 287       fprintf (file, "   x86_EXCEPTION_STATE:\n");
 288       fprintf (file, "    flavor: 0x%08lx  count: 0x%08lx\n",
 289                (unsigned long)bfd_get_32 (abfd, buf + 0),
 290                (unsigned long)bfd_get_32 (abfd, buf + 4));
 291       fprintf (file, "    trapno: %08lx  err: %08lx  faultaddr: %08lx\n",
 292                (unsigned long)bfd_get_32 (abfd, buf + 8),
 293                (unsigned long)bfd_get_32 (abfd, buf + 12),
 294                (unsigned long)bfd_get_32 (abfd, buf + 16));
 295       return TRUE;
 296     default:
 297       break;
 298     }
 299   return FALSE;
 300 }
 301
 302 static const mach_o_section_name_xlat text_section_names_xlat[] =
 303   {
 304     {   ".symbol_stub",                 "__symbol_stub",
 305         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 306         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 307                                         0},
 308     {   ".picsymbol_stub",              "__picsymbol_stub",
 309         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 310         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
 311                                         0},
 312     { NULL, NULL, 0, 0, 0, 0}
 313   };
 314
 315 static const mach_o_section_name_xlat data_section_names_xlat[] =
 316   {
 317     /* The first two are recognized by i386, but not emitted for x86 by
 318        modern GCC.  */
 319     {   ".non_lazy_symbol_pointer",     "__nl_symbol_ptr",
 320         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 321         BFD_MACH_O_S_ATTR_NONE,         2},
 322     {   ".lazy_symbol_pointer",         "__la_symbol_ptr",
 323         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 324         BFD_MACH_O_S_ATTR_NONE,         2},
 325     {   ".lazy_symbol_pointer2",        "__la_sym_ptr2",
 326         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 327         BFD_MACH_O_S_ATTR_NONE,         2},
 328     {   ".lazy_symbol_pointer3",        "__la_sym_ptr3",
 329         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
 330         BFD_MACH_O_S_ATTR_NONE,         2},
 331     { NULL, NULL, 0, 0, 0, 0}
 332   };
 333
 334 static const mach_o_section_name_xlat import_section_names_xlat[] =
 335   {
 336     {   ".picsymbol_stub3",             "__jump_table",
 337         SEC_CODE | SEC_LOAD,            BFD_MACH_O_S_SYMBOL_STUBS,
 338         BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
 339         | BFD_MACH_O_S_SELF_MODIFYING_CODE,
 340                                         6},
 341     {   ".non_lazy_symbol_pointer_x86", "__pointers",
 342         SEC_DATA | SEC_LOAD,            BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
 343         BFD_MACH_O_S_ATTR_NONE,         2},
 344     { NULL, NULL, 0, 0, 0, 0}
 345   };
 346
 347 const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
 348   {
 349     { "__TEXT", text_section_names_xlat },
 350     { "__DATA", data_section_names_xlat },
 351     { "__IMPORT", import_section_names_xlat },
 352     { NULL, NULL }
 353   };
 354
 355 #define bfd_mach_o_swap_reloc_in bfd_mach_o_i386_swap_reloc_in
 356 #define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
 357 #define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
 358
 359 #define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
 360 #define bfd_mach_o_section_type_valid_for_tgt NULL
 361
 362 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
 363 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
 364
 365 #define TARGET_NAME             mach_o_i386_vec
 366 #define TARGET_STRING           "mach-o-i386"
 367 #define TARGET_ARCHITECTURE     bfd_arch_i386
 368 #define TARGET_BIG_ENDIAN       0
 369 #define TARGET_ARCHIVE          0
 370 #define TARGET_PRIORITY         0
 371 #include "mach-o-target.c"