1 /* Mach-O support for BFD.
2 Copyright (C) 2011-2016 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
21 #ifndef _MACH_O_EXTERNAL_H
22 #define _MACH_O_EXTERNAL_H
24 struct mach_o_header_external
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). */
36 #define BFD_MACH_O_HEADER_SIZE 28
37 #define BFD_MACH_O_HEADER_64_SIZE 32
39 /* 32-bit section header. */
41 struct mach_o_section_32_external
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];
55 #define BFD_MACH_O_SECTION_SIZE 68
57 /* 64-bit section header. */
59 struct mach_o_section_64_external
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];
74 #define BFD_MACH_O_SECTION_64_SIZE 80
76 struct mach_o_load_command_external
78 unsigned char cmd
[4]; /* The type of load command. */
79 unsigned char cmdsize
[4]; /* Size in bytes of entire command. */
81 #define BFD_MACH_O_LC_SIZE 8
83 struct mach_o_segment_command_32_external
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. */
95 #define BFD_MACH_O_LC_SEGMENT_SIZE 56 /* Include the header. */
97 struct mach_o_segment_command_64_external
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. */
109 #define BFD_MACH_O_LC_SEGMENT_64_SIZE 72 /* Include the header. */
111 struct mach_o_reloc_info_external
113 unsigned char r_address
[4];
114 unsigned char r_symbolnum
[4];
116 #define BFD_MACH_O_RELENT_SIZE 8
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]. */
123 #define BFD_MACH_O_SR_SCATTERED 0x80000000
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. */
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
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
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
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. */
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)
157 struct mach_o_symtab_command_external
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. */
165 struct mach_o_nlist_external
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];
173 #define BFD_MACH_O_NLIST_SIZE 12
175 struct mach_o_nlist_64_external
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];
183 #define BFD_MACH_O_NLIST_64_SIZE 16
185 struct mach_o_thread_command_external
187 unsigned char flavour
[4];
188 unsigned char count
[4];
191 /* For commands that just have a string or a path. */
192 struct mach_o_str_command_external
194 unsigned char str
[4];
197 struct mach_o_dylib_command_external
199 unsigned char name
[4];
200 unsigned char timestamp
[4];
201 unsigned char current_version
[4];
202 unsigned char compatibility_version
[4];
205 struct mach_o_dysymtab_command_external
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];
227 struct mach_o_dylib_module_external
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];
243 #define BFD_MACH_O_DYLIB_MODULE_SIZE 52
245 struct mach_o_dylib_module_64_external
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];
261 #define BFD_MACH_O_DYLIB_MODULE_64_SIZE 56
263 struct mach_o_dylib_table_of_contents_external
265 unsigned char symbol_index
[4];
266 unsigned char module_index
[4];
268 #define BFD_MACH_O_TABLE_OF_CONTENT_SIZE 8
270 struct mach_o_linkedit_data_command_external
272 unsigned char dataoff
[4];
273 unsigned char datasize
[4];
276 struct mach_o_dyld_info_command_external
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];
290 struct mach_o_prebound_dylib_command_external
292 unsigned char name
[4];
293 unsigned char nmodules
[4];
294 unsigned char linked_modules
[4];
297 struct mach_o_prebind_cksum_command_external
299 unsigned char cksum
[4];
302 struct mach_o_twolevel_hints_command_external
304 unsigned char offset
[4];
305 unsigned char nhints
[4];
308 struct mach_o_version_min_command_external
310 unsigned char version
[4];
311 unsigned char reserved
[4];
314 struct mach_o_encryption_info_command_external
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. */
321 struct mach_o_encryption_info_64_command_external
323 unsigned char cryptoff
[4]; /* File offset of the encrypted area. */
324 unsigned char cryptsize
[4]; /* Size of the encrypted area. */
325 unsigned char cryptid
[4]; /* Encryption method. */
326 unsigned char pad
[4]; /* Pad to make struct size a multiple of 8. */
329 struct mach_o_fvmlib_command_external
331 unsigned char name
[4]; /* Offset of the name. */
332 unsigned char minor_version
[4];
333 unsigned char header_addr
[4];
336 struct mach_o_entry_point_command_external
338 unsigned char entryoff
[8]; /* File offset of the entry point. */
339 unsigned char stacksize
[8]; /* Initial stack size, if no null. */
342 struct mach_o_source_version_command_external
344 unsigned char version
[8]; /* Version A.B.C.D.E, with 10 bits for B-E,
345 and 24 bits for A. */
348 /* The LD_DATA_IN_CODE command use a linkedit_data_command that points to
349 a table of entries. */
351 struct mach_o_data_in_code_entry_external
353 unsigned char offset
[4]; /* Offset from the mach_header. */
354 unsigned char length
[2]; /* Number of bytes. */
355 unsigned char kind
[2]; /* Kind. See BFD_MACH_O_DICE_ values. */
358 struct mach_o_linker_option_command_external
360 unsigned char count
[4]; /* Number of strings. */
361 /* COUNT null terminated UTF-8 strings, with 0 at the end for padding. */
364 struct mach_o_fat_header_external
366 unsigned char magic
[4];
367 unsigned char nfat_arch
[4]; /* Number of components. */
370 struct mach_o_fat_arch_external
372 unsigned char cputype
[4];
373 unsigned char cpusubtype
[4];
374 unsigned char offset
[4]; /* File offset of the member. */
375 unsigned char size
[4]; /* Size of the member. */
376 unsigned char align
[4]; /* Power of 2. */
379 struct mach_o_dyld_cache_header_external
381 unsigned char magic
[16];
383 unsigned char mapping_offset
[4];
384 unsigned char mapping_count
[4];
385 unsigned char images_offset
[4];
386 unsigned char images_count
[4];
388 unsigned char dyld_base_address
[8];
390 unsigned char code_signature_offset
[8];
391 unsigned char code_signature_size
[8];
393 unsigned char slide_info_offset
[8];
394 unsigned char slide_info_size
[8];
396 unsigned char local_symbols_offset
[8];
397 unsigned char local_symbols_size
[8];
400 struct mach_o_dyld_cache_mapping_info_external
402 unsigned char address
[8];
403 unsigned char size
[8];
404 unsigned char file_offset
[8];
405 unsigned char max_prot
[4];
406 unsigned char init_prot
[4];
409 struct mach_o_dyld_cache_image_info_external
411 unsigned char address
[8];
412 unsigned char mtime
[8];
413 unsigned char inode
[8];
414 unsigned char path_file_offset
[4];
415 unsigned char pad
[4];
419 #endif /* _MACH_O_EXTERNAL_H */