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1 /*
2 * Copyright 2008-2012 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/macho.h,v 1.8 2010/04/04 10:03:33 grobian Exp $
5 */
6
7 #ifndef _MACHO_H
8 #define _MACHO_H 1
9
10 #include <stdint.h>
11
12 /*
13 * http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html
14 */
15
16 #define CPU_ARCH_ABI64 0x01000000 /* 64 bit */
17 typedef int cpu_type_t;
18 typedef int cpu_subtype_t;
19
20 struct mach_header
21 {
22 uint32_t magic;
23 cpu_type_t cputype;
24 cpu_subtype_t cpusubtype;
25 uint32_t filetype;
26 uint32_t ncmds;
27 uint32_t sizeofcmds;
28 uint32_t flags;
29 };
30
31 /* magic */
32 #define MH_MAGIC 0xfeedface /* same endianness */
33 #define MH_CIGAM 0xcefaedfe /* the other endianness */
34 /* cputype */
35 #define CPU_TYPE_POWERPC ((cpu_type_t)18)
36 #define CPU_TYPE_I386 ((cpu_type_t)7)
37 #define CPU_TYPE_ARM ((cpu_type_t)12)
38 /* cpusubtype */
39 #define CPU_SUBTYPE_POWERPC_ALL ((cpu_subtype_t)0)
40 #define CPU_SUBTYPE_POWERPC_601 ((cpu_subtype_t)1)
41 #define CPU_SUBTYPE_POWERPC_602 ((cpu_subtype_t)2)
42 #define CPU_SUBTYPE_POWERPC_603 ((cpu_subtype_t)3)
43 #define CPU_SUBTYPE_POWERPC_603e ((cpu_subtype_t)4)
44 #define CPU_SUBTYPE_POWERPC_603ev ((cpu_subtype_t)5)
45 #define CPU_SUBTYPE_POWERPC_604 ((cpu_subtype_t)6)
46 #define CPU_SUBTYPE_POWERPC_604e ((cpu_subtype_t)7)
47 #define CPU_SUBTYPE_POWERPC_620 ((cpu_subtype_t)8)
48 #define CPU_SUBTYPE_POWERPC_750 ((cpu_subtype_t)9)
49 #define CPU_SUBTYPE_POWERPC_7400 ((cpu_subtype_t)10)
50 #define CPU_SUBTYPE_POWERPC_7450 ((cpu_subtype_t)11)
51 #define CPU_SUBTYPE_POWERPC_970 ((cpu_subtype_t)100)
52 #define CPU_SUBTYPE_I386_ALL ((cpu_subtype_t)3)
53 #define CPU_SUBTYPE_486 ((cpu_subtype_t)4)
54 #define CPU_SUBTYPE_586 ((cpu_subtype_t)5)
55 #define CPU_SUBTYPE_PENTIUM_3 ((cpu_subtype_t)8)
56 #define CPU_SUBTYPE_PENTIUM_M ((cpu_subtype_t)9)
57 #define CPU_SUBTYPE_PENTIUM_4 ((cpu_subtype_t)10)
58 #define CPU_SUBTYPE_ITANIUM ((cpu_subtype_t)11)
59 #define CPU_SUBTYPE_XEON ((cpu_subtype_t)12)
60 /* filetype */
61 #define MH_OBJECT 0x1 /* intermediate object file (.o) */
62 #define MH_EXECUTE 0x2 /* standard executable program */
63 #define MH_BUNDLE 0x8 /* dlopen plugin (.bundle) */
64 #define MH_DYLIB 0x6 /* dynamic shared library (.dylib) */
65 #define MH_PRELOAD 0x5 /* executable not loaded by Mac OS X kernel (ROM) */
66 #define MH_CORE 0x4 /* program crash core file */
67 #define MH_DYLINKER 0x7 /* dynamic linker shared library (dyld) */
68 #define MH_DYLIB_STUB 0x9 /* shared library stub for static only, no section*/
69 #define MH_DSYM 0xa /* debug symbols file (in .dSYM dir) */
70 /* flags */
71 #define MH_NOUNDEFS 0x1 /* there are no undefined references */
72 #define MH_INCRLINK 0x2 /* the object file is the output of an
73 incremental link against a base file and
74 cannot be link edited again */
75 #define MH_DYLDLINK 0x4 /* the object file is input for the dynamic
76 linker and cannot be staticly link edited
77 again */
78 #define MH_TWOLEVEL 0x80 /* the image is using two-level namespace
79 bindings */
80 #define MH_BINDATLOAD 0x8 /* the dynamic linker should bind the
81 undefined references when the file is
82 loaded */
83 #define MH_PREBOUND 0x10 /* the file’s undefined references are
84 prebound */
85 #define MH_PREBINDABLE 0x800/* the file is not prebound but can have its
86 prebinding redone, used only when
87 MH_PREBOUND is not set */
88 #define MH_NOFIXPREBINDING 0x400 /* the dynamic linker doesn’t notify
89 the prebinding agent about this
90 executable */
91 #define MH_ALLMODSBOUND 0x1000 /* indicates that this binary binds to
92 all two-level namespace modules of its
93 dependent libraries, used only when
94 MH_PREBINDABLE and MH_TWOLEVEL are set
95 */
96 #define MH_CANONICAL 0x4000 /* the file has been canonicalized by
97 unprebinding, clearing prebinding
98 information from the file */
99 #define MH_SPLIT_SEGS 0x20 /* the file has its read-only and
100 read-write segments split */
101 #define MH_FORCE_FLAT 0x100 /* the executable is forcing all images to
102 use flat namespace bindings */
103 #define MH_SUBSECTIONS_VIA_SYMBOLS 0x2000/* the sections of the object
104 file can be divided into
105 individual blocks, these
106 blocks are dead-stripped if
107 they are not used by other
108 code */
109 #define MH_NOMULTIDEFS 0x200 /* this umbrella guarantees there are no
110 multiple defintions of symbols in its
111 subimages, as a result the two-level
112 namespace hints can always be used */
113
114 struct mach_header_64
115 {
116 uint32_t magic;
117 cpu_type_t cputype;
118 cpu_subtype_t cpusubtype;
119 uint32_t filetype;
120 uint32_t ncmds;
121 uint32_t sizeofcmds;
122 uint32_t flags;
123 uint32_t reserved;
124 };
125
126 /* magic */
127 #define MH_MAGIC_64 0xfeedfacf /* same endianness 64-bits */
128 #define MH_CIGAM_64 0xcffaedfe /* the other endianness 64-bits */
129 /* cputype */
130 #define CPU_TYPE_POWERPC64 (CPU_TYPE_POWERPC | CPU_ARCH_ABI64)
131 #define CPU_TYPE_X86_64 (CPU_TYPE_I386 | CPU_ARCH_ABI64)
132
133 struct load_command
134 {
135 uint32_t cmd;
136 uint32_t cmdsize;
137 };
138
139 /* cmd */
140 #define LC_UUID 0x1b /* Specifies the 128-bit UUID for an image
141 or its corresponding dSYM file. */
142 #define LC_SEGMENT 0x1 /* Defines a segment of this file to be
143 mapped into the address space of the
144 process that loads this file. It also
145 includes all the sections contained by
146 the segment. */
147 #define LC_SEGMENT_64 0x19 /* Defines a 64-bit segment of this file to
148 be mapped into the address space of the
149 process that loads this file. It also
150 includes all the sections contained by
151 the segment. */
152 #define LC_SYMTAB 0x2 /* Specifies the symbol table for this file.
153 This information is used by both static
154 and dynamic linkers when linking the
155 file, and also by debuggers to map
156 symbols to the original source code files
157 from which the symbols were generated. */
158 #define LC_DYSYMTAB 0xb /* Specifies additional symbol table
159 information used by the dynamic linker. */
160 #define LC_THREAD 0x4
161 #define LC_UNIXTHREAD 0x5 /* For an executable file, the LC_UNIXTHREAD
162 command defines the initial thread state
163 of the main thread of the process.
164 LC_THREAD is similar to LC_UNIXTHREAD but
165 does not cause the kernel to allocate a
166 stack. */
167 #define LC_LOAD_DYLIB 0xc /* Defines the name of a dynamic shared
168 library that this file links against.
169 (needed) */
170 #define LC_ID_DYLIB 0xd /* Specifies the install name of a dynamic
171 shared library. (soname) */
172 #define LC_PREBOUND_DYLIB 0x10 /* For a shared library that this
173 executable is linked prebound against,
174 specifies the modules in the shared
175 library that are used. */
176 #define LC_LOAD_DYLINKER 0xe/* Specifies the dynamic linker that the
177 kernel executes to load this file. (.interp) */
178 #define LC_ID_DYLINKER 0xf /* Identifies this file as a dynamic linker. */
179 #define LC_ROUTINES 0x11 /* Contains the address of the shared
180 library initialization routine (specified
181 by the linker’s -init option). */
182 #define LC_ROUTINES_64 0x1a /* Contains the address of the shared
183 library 64-bit initialization routine
184 (specified by the linker’s -init option). */
185 #define LC_TWOLEVEL_HINTS 0x16 /* Contains the two-level namespace
186 lookup hint table. */
187 #define LC_SUB_FRAMEWORK 0x12/* Identifies this file as the
188 implementation of a subframework of an
189 umbrella framework. The name of the
190 umbrella framework is stored in the
191 string parameter. */
192 #define LC_SUB_UMBRELLA 0x13/* Specifies a file that is a subumbrella of
193 this umbrella framework. */
194 #define LC_SUB_LIBRARY 0x15/* Identifies this file as the
195 implementation of a sublibrary of an
196 umbrella framework. The name of the
197 umbrella framework is stored in the
198 string parameter. Note that Apple has not
199 defined a supported location for
200 sublibraries. */
201 #define LC_SUB_CLIENT 0x14/* A subframework can explicitly allow
202 another framework or bundle to link
203 against it by including an LC_SUB_CLIENT
204 load command containing the name of the
205 framework or a client name for a bundle. */
206
207 union lc_str
208 {
209 uint32_t offset;
210 /* The ptr field is not used in Mach-O files.
211 char *ptr; */
212 };
213 /* offset: A byte offset from the start of the load command that
214 * contains this string to the start of the string data.
215 */
216
217 /*
218 Defines the data used by the dynamic linker to match a shared library against the files that have linked to it.
219 */
220 struct dylib
221 {
222 union lc_str name;
223 uint32_t timestamp;
224 uint32_t current_version;
225 uint32_t compatibility_version;
226 };
227
228 /*
229 Defines the attributes of the LC_LOAD_DYLIB and LC_ID_DYLIB load commands.
230 */
231 struct dylib_command
232 {
233 uint32_t cmd;
234 uint32_t cmdsize;
235 struct dylib dylib;
236 };
237
238 /* cmd: set to either LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, or LC_ID_DYLIB. */
239 /* cmdsize: set to sizeof(dylib_command) plus the size of the data
240 * pointed to by the name field of the dylib field. */
241
242 struct dylinker_command {
243 uint32_t cmd;
244 uint32_t cmdsize;
245 union lc_str name;
246 };
247
248 struct fat_header
249 {
250 uint32_t magic;
251 uint32_t nfat_arch;
252 };
253
254 /* magic */
255 #define FAT_MAGIC 0xcafebabe /* big endian, how it is stored */
256 #define FAT_CIGAM 0xbebafeca /* for intel dudes */
257 /* nfat_arch: the number of far_arch structures following */
258
259 struct fat_arch
260 {
261 cpu_type_t cputype;
262 cpu_subtype_t cpusubtype;
263 uint32_t offset;
264 uint32_t size;
265 uint32_t align;
266 };
267
268 #endif

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