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_entry_point_command_external 312 { 313 unsigned char entryoff[8]; /* File offset of the entry point. */ 314 unsigned char stacksize[8]; /* Initial stack size, if no null. */ 315 }; 316 317 struct mach_o_source_version_command_external 318 { 319 unsigned char version[8]; /* Version A.B.C.D.E, with 10 bits for B-E, 320 and 24 bits for A. */ 321 }; 322 323 /* The LD_DATA_IN_CODE command use a linkedit_data_command that points to 324 a table of entries. */ 325 326 struct mach_o_data_in_code_entry_external 327 { 328 unsigned char offset[4]; /* Offset from the mach_header. */ 329 unsigned char length[2]; /* Number of bytes. */ 330 unsigned char kind[2]; /* Kind. See BFD_MACH_O_DICE_ values. */ 331 }; 332 333 struct mach_o_fat_header_external 334 { 335 unsigned char magic[4]; 336 unsigned char nfat_arch[4]; /* Number of components. */ 337 }; 338 339 struct mach_o_fat_arch_external 340 { 341 unsigned char cputype[4]; 342 unsigned char cpusubtype[4]; 343 unsigned char offset[4]; /* File offset of the member. */ 344 unsigned char size[4]; /* Size of the member. */ 345 unsigned char align[4]; /* Power of 2. */ 346 }; 347 348 #endif /* _MACH_O_EXTERNAL_H */ 349