1 /* Mach-O support for BFD. 2 Copyright (C) 2011-2014 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 #ifndef _MACH_O_EXTERNAL_H 22 #define _MACH_O_EXTERNAL_H 23 24 struct mach_o_header_external 25 { 26 unsigned char magic[4]; /* Magic number. */ 27 unsigned char cputype[4]; /* CPU that this object is for. */ 28 unsigned char cpusubtype[4]; /* CPU subtype. */ 29 unsigned char filetype[4]; /* Type of file. */ 30 unsigned char ncmds[4]; /* Number of load commands. */ 31 unsigned char sizeofcmds[4]; /* Total size of load commands. */ 32 unsigned char flags[4]; /* Flags. */ 33 unsigned char reserved[4]; /* Reserved (on 64-bit version only). */ 34 }; 35 36 #define BFD_MACH_O_HEADER_SIZE 28 37 #define BFD_MACH_O_HEADER_64_SIZE 32 38 39 /* 32-bit section header. */ 40 41 struct mach_o_section_32_external 42 { 43 unsigned char sectname[16]; /* Section name. */ 44 unsigned char segname[16]; /* Segment that the section belongs to. */ 45 unsigned char addr[4]; /* Address of this section in memory. */ 46 unsigned char size[4]; /* Size in bytes of this section. */ 47 unsigned char offset[4]; /* File offset of this section. */ 48 unsigned char align[4]; /* log2 of this section's alignment. */ 49 unsigned char reloff[4]; /* File offset of this section's relocs. */ 50 unsigned char nreloc[4]; /* Number of relocs for this section. */ 51 unsigned char flags[4]; /* Section flags/attributes. */ 52 unsigned char reserved1[4]; 53 unsigned char reserved2[4]; 54 }; 55 #define BFD_MACH_O_SECTION_SIZE 68 56 57 /* 64-bit section header. */ 58 59 struct mach_o_section_64_external 60 { 61 unsigned char sectname[16]; /* Section name. */ 62 unsigned char segname[16]; /* Segment that the section belongs to. */ 63 unsigned char addr[8]; /* Address of this section in memory. */ 64 unsigned char size[8]; /* Size in bytes of this section. */ 65 unsigned char offset[4]; /* File offset of this section. */ 66 unsigned char align[4]; /* log2 of this section's alignment. */ 67 unsigned char reloff[4]; /* File offset of this section's relocs. */ 68 unsigned char nreloc[4]; /* Number of relocs for this section. */ 69 unsigned char flags[4]; /* Section flags/attributes. */ 70 unsigned char reserved1[4]; 71 unsigned char reserved2[4]; 72 unsigned char reserved3[4]; 73 }; 74 #define BFD_MACH_O_SECTION_64_SIZE 80 75 76 struct mach_o_load_command_external 77 { 78 unsigned char cmd[4]; /* The type of load command. */ 79 unsigned char cmdsize[4]; /* Size in bytes of entire command. */ 80 }; 81 #define BFD_MACH_O_LC_SIZE 8 82 83 struct mach_o_segment_command_32_external 84 { 85 unsigned char segname[16]; /* Name of this segment. */ 86 unsigned char vmaddr[4]; /* Virtual memory address of this segment. */ 87 unsigned char vmsize[4]; /* Size there, in bytes. */ 88 unsigned char fileoff[4]; /* Offset in bytes of the data to be mapped. */ 89 unsigned char filesize[4]; /* Size in bytes on disk. */ 90 unsigned char maxprot[4]; /* Maximum permitted vm protection. */ 91 unsigned char initprot[4]; /* Initial vm protection. */ 92 unsigned char nsects[4]; /* Number of sections in this segment. */ 93 unsigned char flags[4]; /* Flags that affect the loading. */ 94 }; 95 #define BFD_MACH_O_LC_SEGMENT_SIZE 56 /* Include the header. */ 96 97 struct mach_o_segment_command_64_external 98 { 99 unsigned char segname[16]; /* Name of this segment. */ 100 unsigned char vmaddr[8]; /* Virtual memory address of this segment. */ 101 unsigned char vmsize[8]; /* Size there, in bytes. */ 102 unsigned char fileoff[8]; /* Offset in bytes of the data to be mapped. */ 103 unsigned char filesize[8]; /* Size in bytes on disk. */ 104 unsigned char maxprot[4]; /* Maximum permitted vm protection. */ 105 unsigned char initprot[4]; /* Initial vm protection. */ 106 unsigned char nsects[4]; /* Number of sections in this segment. */ 107 unsigned char flags[4]; /* Flags that affect the loading. */ 108 }; 109 #define BFD_MACH_O_LC_SEGMENT_64_SIZE 72 /* Include the header. */ 110 111 struct mach_o_reloc_info_external 112 { 113 unsigned char r_address[4]; 114 unsigned char r_symbolnum[4]; 115 }; 116 #define BFD_MACH_O_RELENT_SIZE 8 117 118 /* Relocations are based on 'address' being a section offset and an assumption 119 that sections are never more than 2^24-1 bytes in size. Relocation data 120 also carry information on type/size/PC-relative/extern and whether scattered 121 or not [stored in the MSB of the r_address]. */ 122 123 #define BFD_MACH_O_SR_SCATTERED 0x80000000 124 125 /* For a non-scattered reloc, the relocation info is found in r_symbolnum. 126 Bytes 1 to 3 contain the symbol number (0xffffff, in a non-scattered PAIR). 127 Byte 4 contains the relocation info - but with differing bit-positions 128 dependent on target endian-ness - as below. */ 129 130 #define BFD_MACH_O_LE_PCREL 0x01 131 #define BFD_MACH_O_LE_LENGTH_SHIFT 1 132 #define BFD_MACH_O_LE_EXTERN 0x08 133 #define BFD_MACH_O_LE_TYPE_SHIFT 4 134 135 #define BFD_MACH_O_BE_PCREL 0x80 136 #define BFD_MACH_O_BE_LENGTH_SHIFT 5 137 #define BFD_MACH_O_BE_EXTERN 0x10 138 #define BFD_MACH_O_BE_TYPE_SHIFT 0 139 140 /* The field sizes are the same for both BE and LE. */ 141 #define BFD_MACH_O_LENGTH_MASK 0x03 142 #define BFD_MACH_O_TYPE_MASK 0x0f 143 144 /* For a scattered reloc entry the info is contained in r_address. There 145 is no need to discriminate on target endian-ness, since the design was 146 arranged to produce the same layout on both. Scattered relocations are 147 only used for local items, therefore there is no 'extern' field. */ 148 149 #define BFD_MACH_O_SR_PCREL 0x40000000 150 #define BFD_MACH_O_GET_SR_LENGTH(s) (((s) >> 28) & 0x3) 151 #define BFD_MACH_O_GET_SR_TYPE(s) (((s) >> 24) & 0x0f) 152 #define BFD_MACH_O_GET_SR_ADDRESS(s) ((s) & 0x00ffffff) 153 #define BFD_MACH_O_SET_SR_LENGTH(l) (((l) & 0x3) << 28) 154 #define BFD_MACH_O_SET_SR_TYPE(t) (((t) & 0xf) << 24) 155 #define BFD_MACH_O_SET_SR_ADDRESS(s) ((s) & 0x00ffffff) 156 157 struct mach_o_symtab_command_external 158 { 159 unsigned char symoff[4]; /* File offset of the symbol table. */ 160 unsigned char nsyms[4]; /* Number of symbols. */ 161 unsigned char stroff[4]; /* File offset of the string table. */ 162 unsigned char strsize[4]; /* String table size. */ 163 }; 164 165 struct mach_o_nlist_external 166 { 167 unsigned char n_strx[4]; 168 unsigned char n_type[1]; 169 unsigned char n_sect[1]; 170 unsigned char n_desc[2]; 171 unsigned char n_value[4]; 172 }; 173 #define BFD_MACH_O_NLIST_SIZE 12 174 175 struct mach_o_nlist_64_external 176 { 177 unsigned char n_strx[4]; 178 unsigned char n_type[1]; 179 unsigned char n_sect[1]; 180 unsigned char n_desc[2]; 181 unsigned char n_value[8]; 182 }; 183 #define BFD_MACH_O_NLIST_64_SIZE 16 184 185 struct mach_o_thread_command_external 186 { 187 unsigned char flavour[4]; 188 unsigned char count[4]; 189 }; 190 191 /* For commands that just have a string or a path. */ 192 struct mach_o_str_command_external 193 { 194 unsigned char str[4]; 195 }; 196 197 struct mach_o_dylib_command_external 198 { 199 unsigned char name[4]; 200 unsigned char timestamp[4]; 201 unsigned char current_version[4]; 202 unsigned char compatibility_version[4]; 203 }; 204 205 struct mach_o_dysymtab_command_external 206 { 207 unsigned char ilocalsym[4]; /* Index of. */ 208 unsigned char nlocalsym[4]; /* Number of. */ 209 unsigned char iextdefsym[4]; 210 unsigned char nextdefsym[4]; 211 unsigned char iundefsym[4]; 212 unsigned char nundefsym[4]; 213 unsigned char tocoff[4]; 214 unsigned char ntoc[4]; 215 unsigned char modtaboff[4]; 216 unsigned char nmodtab[4]; 217 unsigned char extrefsymoff[4]; 218 unsigned char nextrefsyms[4]; 219 unsigned char indirectsymoff[4]; 220 unsigned char nindirectsyms[4]; 221 unsigned char extreloff[4]; 222 unsigned char nextrel[4]; 223 unsigned char locreloff[4]; 224 unsigned char nlocrel[4]; 225 }; 226 227 struct mach_o_dylib_module_external 228 { 229 unsigned char module_name[4]; 230 unsigned char iextdefsym[4]; 231 unsigned char nextdefsym[4]; 232 unsigned char irefsym[4]; 233 unsigned char nrefsym[4]; 234 unsigned char ilocalsym[4]; 235 unsigned char nlocalsym[4]; 236 unsigned char iextrel[4]; 237 unsigned char nextrel[4]; 238 unsigned char iinit_iterm[4]; 239 unsigned char ninit_nterm[4]; 240 unsigned char objc_module_info_addr[4]; 241 unsigned char objc_module_info_size[4]; 242 }; 243 #define BFD_MACH_O_DYLIB_MODULE_SIZE 52 244 245 struct mach_o_dylib_module_64_external 246 { 247 unsigned char module_name[4]; 248 unsigned char iextdefsym[4]; 249 unsigned char nextdefsym[4]; 250 unsigned char irefsym[4]; 251 unsigned char nrefsym[4]; 252 unsigned char ilocalsym[4]; 253 unsigned char nlocalsym[4]; 254 unsigned char iextrel[4]; 255 unsigned char nextrel[4]; 256 unsigned char iinit_iterm[4]; 257 unsigned char ninit_nterm[4]; 258 unsigned char objc_module_info_size[4]; 259 unsigned char objc_module_info_addr[8]; 260 }; 261 #define BFD_MACH_O_DYLIB_MODULE_64_SIZE 56 262 263 struct mach_o_dylib_table_of_contents_external 264 { 265 unsigned char symbol_index[4]; 266 unsigned char module_index[4]; 267 }; 268 #define BFD_MACH_O_TABLE_OF_CONTENT_SIZE 8 269 270 struct mach_o_linkedit_data_command_external 271 { 272 unsigned char dataoff[4]; 273 unsigned char datasize[4]; 274 }; 275 276 struct mach_o_dyld_info_command_external 277 { 278 unsigned char rebase_off[4]; 279 unsigned char rebase_size[4]; 280 unsigned char bind_off[4]; 281 unsigned char bind_size[4]; 282 unsigned char weak_bind_off[4]; 283 unsigned char weak_bind_size[4]; 284 unsigned char lazy_bind_off[4]; 285 unsigned char lazy_bind_size[4]; 286 unsigned char export_off[4]; 287 unsigned char export_size[4]; 288 }; 289 290 struct mach_o_prebound_dylib_command_external 291 { 292 unsigned char name[4]; 293 unsigned char nmodules[4]; 294 unsigned char linked_modules[4]; 295 }; 296 297 struct mach_o_prebind_cksum_command_external 298 { 299 unsigned char cksum[4]; 300 }; 301 302 struct mach_o_twolevel_hints_command_external 303 { 304 unsigned char offset[4]; 305 unsigned char nhints[4]; 306 }; 307 308 struct mach_o_version_min_command_external 309 { 310 unsigned char version[4]; 311 unsigned char reserved[4]; 312 }; 313 314 struct mach_o_encryption_info_command_external 315 { 316 unsigned char cryptoff[4]; /* File offset of the encrypted area. */ 317 unsigned char cryptsize[4]; /* Size of the encrypted area. */ 318 unsigned char cryptid[4]; /* Encryption method. */ 319 }; 320 321 struct mach_o_fvmlib_command_external 322 { 323 unsigned char name[4]; /* Offset of the name. */ 324 unsigned char minor_version[4]; 325 unsigned char header_addr[4]; 326 }; 327 328 struct mach_o_entry_point_command_external 329 { 330 unsigned char entryoff[8]; /* File offset of the entry point. */ 331 unsigned char stacksize[8]; /* Initial stack size, if no null. */ 332 }; 333 334 struct mach_o_source_version_command_external 335 { 336 unsigned char version[8]; /* Version A.B.C.D.E, with 10 bits for B-E, 337 and 24 bits for A. */ 338 }; 339 340 /* The LD_DATA_IN_CODE command use a linkedit_data_command that points to 341 a table of entries. */ 342 343 struct mach_o_data_in_code_entry_external 344 { 345 unsigned char offset[4]; /* Offset from the mach_header. */ 346 unsigned char length[2]; /* Number of bytes. */ 347 unsigned char kind[2]; /* Kind. See BFD_MACH_O_DICE_ values. */ 348 }; 349 350 struct mach_o_fat_header_external 351 { 352 unsigned char magic[4]; 353 unsigned char nfat_arch[4]; /* Number of components. */ 354 }; 355 356 struct mach_o_fat_arch_external 357 { 358 unsigned char cputype[4]; 359 unsigned char cpusubtype[4]; 360 unsigned char offset[4]; /* File offset of the member. */ 361 unsigned char size[4]; /* Size of the member. */ 362 unsigned char align[4]; /* Power of 2. */ 363 }; 364 365 #endif /* _MACH_O_EXTERNAL_H */ 366
