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