include/mach-o/external.h

   1 /* Mach-O support for BFD.
   2    Copyright 2011, 2012
   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 #ifndef _MACH_O_EXTERNAL_H
  23 #define _MACH_O_EXTERNAL_H
  24
  25 struct mach_o_header_external
  26 {
  27   unsigned char magic[4];       /* Magic number.  */
  28   unsigned char cputype[4];     /* CPU that this object is for.  */
  29   unsigned char cpusubtype[4];  /* CPU subtype.  */
  30   unsigned char filetype[4];    /* Type of file.  */
  31   unsigned char ncmds[4];       /* Number of load commands.  */
  32   unsigned char sizeofcmds[4];  /* Total size of load commands.  */
  33   unsigned char flags[4];       /* Flags.  */
  34   unsigned char reserved[4];    /* Reserved (on 64-bit version only).  */
  35 };
  36
  37 #define BFD_MACH_O_HEADER_SIZE 28
  38 #define BFD_MACH_O_HEADER_64_SIZE 32
  39
  40 /* 32-bit section header.  */
  41
  42 struct mach_o_section_32_external
  43 {
  44   unsigned char sectname[16];   /* Section name.  */
  45   unsigned char segname[16];    /* Segment that the section belongs to.  */
  46   unsigned char addr[4];        /* Address of this section in memory.  */
  47   unsigned char size[4];        /* Size in bytes of this section.  */
  48   unsigned char offset[4];      /* File offset of this section.  */
  49   unsigned char align[4];       /* log2 of this section's alignment.  */
  50   unsigned char reloff[4];      /* File offset of this section's relocs.  */
  51   unsigned char nreloc[4];      /* Number of relocs for this section.  */
  52   unsigned char flags[4];       /* Section flags/attributes.  */
  53   unsigned char reserved1[4];
  54   unsigned char reserved2[4];
  55 };
  56 #define BFD_MACH_O_SECTION_SIZE 68
  57
  58 /* 64-bit section header.  */
  59
  60 struct mach_o_section_64_external
  61 {
  62   unsigned char sectname[16];   /* Section name.  */
  63   unsigned char segname[16];    /* Segment that the section belongs to.  */
  64   unsigned char addr[8];        /* Address of this section in memory.  */
  65   unsigned char size[8];        /* Size in bytes of this section.  */
  66   unsigned char offset[4];      /* File offset of this section.  */
  67   unsigned char align[4];       /* log2 of this section's alignment.  */
  68   unsigned char reloff[4];      /* File offset of this section's relocs.  */
  69   unsigned char nreloc[4];      /* Number of relocs for this section.  */
  70   unsigned char flags[4];       /* Section flags/attributes.  */
  71   unsigned char reserved1[4];
  72   unsigned char reserved2[4];
  73   unsigned char reserved3[4];
  74 };
  75 #define BFD_MACH_O_SECTION_64_SIZE 80
  76
  77 struct mach_o_load_command_external
  78 {
  79   unsigned char cmd[4];         /* The type of load command.  */
  80   unsigned char cmdsize[4];     /* Size in bytes of entire command.  */
  81 };
  82 #define BFD_MACH_O_LC_SIZE 8
  83
  84 struct mach_o_segment_command_32_external
  85 {
  86   unsigned char segname[16];    /* Name of this segment.  */
  87   unsigned char vmaddr[4];      /* Virtual memory address of this segment.  */
  88   unsigned char vmsize[4];      /* Size there, in bytes.  */
  89   unsigned char fileoff[4];     /* Offset in bytes of the data to be mapped.  */
  90   unsigned char filesize[4];    /* Size in bytes on disk.  */
  91   unsigned char maxprot[4];     /* Maximum permitted vm protection.  */
  92   unsigned char initprot[4];    /* Initial vm protection.  */
  93   unsigned char nsects[4];      /* Number of sections in this segment.  */
  94   unsigned char flags[4];       /* Flags that affect the loading.  */
  95 };
  96 #define BFD_MACH_O_LC_SEGMENT_SIZE 56 /* Include the header.  */
  97
  98 struct mach_o_segment_command_64_external
  99 {
 100   unsigned char segname[16];    /* Name of this segment.  */
 101   unsigned char vmaddr[8];      /* Virtual memory address of this segment.  */
 102   unsigned char vmsize[8];      /* Size there, in bytes.  */
 103   unsigned char fileoff[8];     /* Offset in bytes of the data to be mapped.  */
 104   unsigned char filesize[8];    /* Size in bytes on disk.  */
 105   unsigned char maxprot[4];     /* Maximum permitted vm protection.  */
 106   unsigned char initprot[4];    /* Initial vm protection.  */
 107   unsigned char nsects[4];      /* Number of sections in this segment.  */
 108   unsigned char flags[4];       /* Flags that affect the loading.  */
 109 };
 110 #define BFD_MACH_O_LC_SEGMENT_64_SIZE 72 /* Include the header.  */
 111
 112 struct mach_o_reloc_info_external
 113 {
 114   unsigned char r_address[4];
 115   unsigned char r_symbolnum[4];
 116 };
 117 #define BFD_MACH_O_RELENT_SIZE 8
 118
 119 /* Relocations are based on 'address' being a section offset and an assumption
 120    that sections are never more than 2^24-1 bytes in size.  Relocation data
 121    also carry information on type/size/PC-relative/extern and whether scattered
 122    or not [stored in the MSB of the r_address].  */
 123
 124 #define BFD_MACH_O_SR_SCATTERED         0x80000000
 125
 126 /* For a non-scattered reloc, the relocation info is found in r_symbolnum.
 127    Bytes 1 to 3 contain the symbol number (0xffffff, in a non-scattered PAIR).
 128    Byte 4 contains the relocation info - but with differing bit-positions
 129    dependent on target endian-ness - as below.  */
 130
 131 #define BFD_MACH_O_LE_PCREL             0x01
 132 #define BFD_MACH_O_LE_LENGTH_SHIFT      1
 133 #define BFD_MACH_O_LE_EXTERN            0x08
 134 #define BFD_MACH_O_LE_TYPE_SHIFT        4
 135
 136 #define BFD_MACH_O_BE_PCREL             0x80
 137 #define BFD_MACH_O_BE_LENGTH_SHIFT      5
 138 #define BFD_MACH_O_BE_EXTERN            0x10
 139 #define BFD_MACH_O_BE_TYPE_SHIFT        0
 140
 141 /* The field sizes are the same for both BE and LE.  */
 142 #define BFD_MACH_O_LENGTH_MASK          0x03
 143 #define BFD_MACH_O_TYPE_MASK            0x0f
 144
 145 /* For a scattered reloc entry the info is contained in r_address.  There
 146    is no need to discriminate on target endian-ness, since the design was
 147    arranged to produce the same layout on both.  Scattered relocations are
 148    only used for local items, therefore there is no 'extern' field.  */
 149
 150 #define BFD_MACH_O_SR_PCREL             0x40000000
 151 #define BFD_MACH_O_GET_SR_LENGTH(s)     (((s) >> 28) & 0x3)
 152 #define BFD_MACH_O_GET_SR_TYPE(s)       (((s) >> 24) & 0x0f)
 153 #define BFD_MACH_O_GET_SR_ADDRESS(s)    ((s) & 0x00ffffff)
 154 #define BFD_MACH_O_SET_SR_LENGTH(l)     (((l) & 0x3) << 28)
 155 #define BFD_MACH_O_SET_SR_TYPE(t)       (((t) & 0xf) << 24)
 156 #define BFD_MACH_O_SET_SR_ADDRESS(s)    ((s) & 0x00ffffff)
 157
 158 struct mach_o_symtab_command_external
 159 {
 160   unsigned char symoff[4];      /* File offset of the symbol table.  */
 161   unsigned char nsyms[4];       /* Number of symbols.  */
 162   unsigned char stroff[4];      /* File offset of the string table.  */
 163   unsigned char strsize[4];     /* String table size.  */
 164 };
 165
 166 struct mach_o_nlist_external
 167 {
 168   unsigned char n_strx[4];
 169   unsigned char n_type[1];
 170   unsigned char n_sect[1];
 171   unsigned char n_desc[2];
 172   unsigned char n_value[4];
 173 };
 174 #define BFD_MACH_O_NLIST_SIZE 12
 175
 176 struct mach_o_nlist_64_external
 177 {
 178   unsigned char n_strx[4];
 179   unsigned char n_type[1];
 180   unsigned char n_sect[1];
 181   unsigned char n_desc[2];
 182   unsigned char n_value[8];
 183 };
 184 #define BFD_MACH_O_NLIST_64_SIZE 16
 185
 186 struct mach_o_thread_command_external
 187 {
 188   unsigned char flavour[4];
 189   unsigned char count[4];
 190 };
 191
 192 /* For commands that just have a string or a path.  */
 193 struct mach_o_str_command_external
 194 {
 195   unsigned char str[4];
 196 };
 197
 198 struct mach_o_dylib_command_external
 199 {
 200   unsigned char name[4];
 201   unsigned char timestamp[4];
 202   unsigned char current_version[4];
 203   unsigned char compatibility_version[4];
 204 };
 205
 206 struct mach_o_dysymtab_command_external
 207 {
 208   unsigned char ilocalsym[4];   /* Index of.  */
 209   unsigned char nlocalsym[4];   /* Number of.  */
 210   unsigned char iextdefsym[4];
 211   unsigned char nextdefsym[4];
 212   unsigned char iundefsym[4];
 213   unsigned char nundefsym[4];
 214   unsigned char tocoff[4];
 215   unsigned char ntoc[4];
 216   unsigned char modtaboff[4];
 217   unsigned char nmodtab[4];
 218   unsigned char extrefsymoff[4];
 219   unsigned char nextrefsyms[4];
 220   unsigned char indirectsymoff[4];
 221   unsigned char nindirectsyms[4];
 222   unsigned char extreloff[4];
 223   unsigned char nextrel[4];
 224   unsigned char locreloff[4];
 225   unsigned char nlocrel[4];
 226 };
 227
 228 struct mach_o_dylib_module_external
 229 {
 230   unsigned char module_name[4];
 231   unsigned char iextdefsym[4];
 232   unsigned char nextdefsym[4];
 233   unsigned char irefsym[4];
 234   unsigned char nrefsym[4];
 235   unsigned char ilocalsym[4];
 236   unsigned char nlocalsym[4];
 237   unsigned char iextrel[4];
 238   unsigned char nextrel[4];
 239   unsigned char iinit_iterm[4];
 240   unsigned char ninit_nterm[4];
 241   unsigned char objc_module_info_addr[4];
 242   unsigned char objc_module_info_size[4];
 243 };
 244 #define BFD_MACH_O_DYLIB_MODULE_SIZE 52
 245
 246 struct mach_o_dylib_module_64_external
 247 {
 248   unsigned char module_name[4];
 249   unsigned char iextdefsym[4];
 250   unsigned char nextdefsym[4];
 251   unsigned char irefsym[4];
 252   unsigned char nrefsym[4];
 253   unsigned char ilocalsym[4];
 254   unsigned char nlocalsym[4];
 255   unsigned char iextrel[4];
 256   unsigned char nextrel[4];
 257   unsigned char iinit_iterm[4];
 258   unsigned char ninit_nterm[4];
 259   unsigned char objc_module_info_size[4];
 260   unsigned char objc_module_info_addr[8];
 261 };
 262 #define BFD_MACH_O_DYLIB_MODULE_64_SIZE 56
 263
 264 struct mach_o_dylib_table_of_contents_external
 265 {
 266   unsigned char symbol_index[4];
 267   unsigned char module_index[4];
 268 };
 269 #define BFD_MACH_O_TABLE_OF_CONTENT_SIZE 8
 270
 271 struct mach_o_linkedit_data_command_external
 272 {
 273   unsigned char dataoff[4];
 274   unsigned char datasize[4];
 275 };
 276
 277 struct mach_o_dyld_info_command_external
 278 {
 279   unsigned char rebase_off[4];
 280   unsigned char rebase_size[4];
 281   unsigned char bind_off[4];
 282   unsigned char bind_size[4];
 283   unsigned char weak_bind_off[4];
 284   unsigned char weak_bind_size[4];
 285   unsigned char lazy_bind_off[4];
 286   unsigned char lazy_bind_size[4];
 287   unsigned char export_off[4];
 288   unsigned char export_size[4];
 289 };
 290
 291 struct mach_o_version_min_command_external
 292 {
 293   unsigned char version[4];
 294   unsigned char reserved[4];
 295 };
 296
 297 struct mach_o_encryption_info_command_external
 298 {
 299   unsigned char cryptoff[4];    /* File offset of the encrypted area.  */
 300   unsigned char cryptsize[4];   /* Size of the encrypted area.  */
 301   unsigned char cryptid[4];     /* Encryption method.  */
 302 };
 303
 304 struct mach_o_fvmlib_command_external
 305 {
 306   unsigned char name[4];        /* Offset of the name.  */
 307   unsigned char minor_version[4];
 308   unsigned char header_addr[4];
 309 };
 310
 311 struct mach_o_fat_header_external
 312 {
 313   unsigned char magic[4];
 314   unsigned char nfat_arch[4];   /* Number of components.  */
 315 };
 316
 317 struct mach_o_fat_arch_external
 318 {
 319   unsigned char cputype[4];
 320   unsigned char cpusubtype[4];
 321   unsigned char offset[4];      /* File offset of the member.  */
 322   unsigned char size[4];        /* Size of the member.  */
 323   unsigned char align[4];       /* Power of 2.  */
 324 };
 325
 326 #endif /* _MACH_O_EXTERNAL_H */