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Daniel Dunbarfb4a6b32009-08-21 09:11:24 +00001#!/usr/bin/env python
2
3import struct
4import sys
Daniel Dunbar8906ff12009-08-22 07:22:36 +00005import StringIO
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +00006
7class Reader:
8 def __init__(self, path):
9 if path == '-':
Daniel Dunbar8906ff12009-08-22 07:22:36 +000010 # Snarf all the data so we can seek.
11 self.file = StringIO.StringIO(sys.stdin.read())
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000012 else:
13 self.file = open(path,'rb')
14 self.isLSB = None
Daniel Dunbarf0a0be42010-03-13 22:10:11 +000015 self.is64Bit = None
Daniel Dunbar8906ff12009-08-22 07:22:36 +000016
17 self.string_table = None
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000018
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000019 def tell(self):
Daniel Dunbar8906ff12009-08-22 07:22:36 +000020 return self.file.tell()
21
22 def seek(self, pos):
23 self.file.seek(pos)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000024
25 def read(self, N):
26 data = self.file.read(N)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000027 if len(data) != N:
28 raise ValueError,"Out of data!"
29 return data
30
Daniel Dunbar8906ff12009-08-22 07:22:36 +000031 def read8(self):
32 return ord(self.read(1))
33
34 def read16(self):
35 return struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0]
36
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000037 def read32(self):
Daniel Dunbar8333a8a2009-08-22 09:28:33 +000038 # Force to 32-bit, if possible; otherwise these might be long ints on a
39 # big-endian platform. FIXME: Why???
40 Value = struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0]
41 return int(Value)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000042
Daniel Dunbarf0a0be42010-03-13 22:10:11 +000043 def read64(self):
44 return struct.unpack('><'[self.isLSB] + 'Q', self.read(8))[0]
45
Daniel Dunbar8906ff12009-08-22 07:22:36 +000046 def registerStringTable(self, strings):
47 if self.string_table is not None:
48 raise ValueError,"%s: warning: multiple string tables" % sys.argv[0]
49
50 self.string_table = strings
51
52 def getString(self, index):
53 if self.string_table is None:
54 raise ValueError,"%s: warning: no string table registered" % sys.argv[0]
55
56 end = self.string_table.index('\x00', index)
57 return self.string_table[index:end]
58
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000059def dumpmacho(path, opts):
60 f = Reader(path)
61
62 magic = f.read(4)
63 if magic == '\xFE\xED\xFA\xCE':
Daniel Dunbarf0a0be42010-03-13 22:10:11 +000064 f.isLSB, f.is64Bit = False, False
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000065 elif magic == '\xCE\xFA\xED\xFE':
Daniel Dunbarf0a0be42010-03-13 22:10:11 +000066 f.isLSB, f.is64Bit = True, False
67 elif magic == '\xFE\xED\xFA\xCF':
68 f.isLSB, f.is64Bit = False, True
69 elif magic == '\xCF\xFA\xED\xFE':
70 f.isLSB, f.is64Bit = True, True
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000071 else:
72 raise ValueError,"Not a Mach-O object file: %r (bad magic)" % path
73
74 print "('cputype', %r)" % f.read32()
75 print "('cpusubtype', %r)" % f.read32()
76 filetype = f.read32()
77 print "('filetype', %r)" % filetype
78
79 numLoadCommands = f.read32()
80 print "('num_load_commands', %r)" % filetype
81
82 loadCommandsSize = f.read32()
83 print "('load_commands_size', %r)" % loadCommandsSize
84
85 print "('flag', %r)" % f.read32()
86
Daniel Dunbarf0a0be42010-03-13 22:10:11 +000087 if f.is64Bit:
88 print "('reserved', %r)" % f.read32()
89
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000090 start = f.tell()
91
92 print "('load_commands', ["
93 for i in range(numLoadCommands):
94 dumpLoadCommand(f, i, opts)
95 print "])"
96
97 if f.tell() - start != loadCommandsSize:
Daniel Dunbarf0a0be42010-03-13 22:10:11 +000098 raise ValueError,"%s: warning: invalid load commands size: %r" % (
99 sys.argv[0], loadCommandsSize)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000100
101def dumpLoadCommand(f, i, opts):
102 start = f.tell()
103
104 print " # Load Command %r" % i
105 cmd = f.read32()
106 print " (('command', %r)" % cmd
107 cmdSize = f.read32()
108 print " ('size', %r)" % cmdSize
109
110 if cmd == 1:
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000111 dumpSegmentLoadCommand(f, opts, False)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000112 elif cmd == 2:
113 dumpSymtabCommand(f, opts)
114 elif cmd == 11:
115 dumpDysymtabCommand(f, opts)
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000116 elif cmd == 25:
117 dumpSegmentLoadCommand(f, opts, True)
Daniel Dunbar3bc1b192009-10-24 20:32:36 +0000118 elif cmd == 27:
119 import uuid
120 print " ('uuid', %s)" % uuid.UUID(bytes=f.read(16))
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000121 else:
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000122 print >>sys.stderr,"%s: warning: unknown load command: %r" % (
123 sys.argv[0], cmd)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000124 f.read(cmdSize - 8)
125 print " ),"
126
127 if f.tell() - start != cmdSize:
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000128 raise ValueError,"%s: warning: invalid load command size: %r" % (
129 sys.argv[0], cmdSize)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000130
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000131def dumpSegmentLoadCommand(f, opts, is64Bit):
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000132 print " ('segment_name', %r)" % f.read(16)
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000133 if is64Bit:
134 print " ('vm_addr', %r)" % f.read64()
135 print " ('vm_size', %r)" % f.read64()
136 print " ('file_offset', %r)" % f.read64()
137 print " ('file_size', %r)" % f.read64()
138 else:
139 print " ('vm_addr', %r)" % f.read32()
140 print " ('vm_size', %r)" % f.read32()
141 print " ('file_offset', %r)" % f.read32()
142 print " ('file_size', %r)" % f.read32()
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000143 print " ('maxprot', %r)" % f.read32()
144 print " ('initprot', %r)" % f.read32()
145 numSections = f.read32()
146 print " ('num_sections', %r)" % numSections
147 print " ('flags', %r)" % f.read32()
148
149 print " ('sections', ["
150 for i in range(numSections):
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000151 dumpSection(f, i, opts, is64Bit)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000152 print " ])"
153
154def dumpSymtabCommand(f, opts):
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000155 symoff = f.read32()
156 print " ('symoff', %r)" % symoff
157 nsyms = f.read32()
158 print " ('nsyms', %r)" % nsyms
159 stroff = f.read32()
160 print " ('stroff', %r)" % stroff
161 strsize = f.read32()
162 print " ('strsize', %r)" % strsize
163
164 prev_pos = f.tell()
165
166 f.seek(stroff)
167 string_data = f.read(strsize)
168 print " ('_string_data', %r)" % string_data
169
170 f.registerStringTable(string_data)
171
172 f.seek(symoff)
173 print " ('_symbols', ["
174 for i in range(nsyms):
175 dumpNlist32(f, i, opts)
176 print " ])"
177
178 f.seek(prev_pos)
179
180def dumpNlist32(f, i, opts):
181 print " # Symbol %r" % i
182 n_strx = f.read32()
183 print " (('n_strx', %r)" % n_strx
184 n_type = f.read8()
185 print " ('n_type', %#x)" % n_type
186 n_sect = f.read8()
Daniel Dunbard889ac32009-08-22 10:09:17 +0000187 print " ('n_sect', %r)" % n_sect
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000188 n_desc = f.read16()
189 print " ('n_desc', %r)" % n_desc
190 n_value = f.read32()
191 print " ('n_value', %r)" % n_value
192 print " ('_string', %r)" % f.getString(n_strx)
193 print " ),"
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000194
195def dumpDysymtabCommand(f, opts):
196 print " ('ilocalsym', %r)" % f.read32()
197 print " ('nlocalsym', %r)" % f.read32()
198 print " ('iextdefsym', %r)" % f.read32()
199 print " ('nextdefsym', %r)" % f.read32()
200 print " ('iundefsym', %r)" % f.read32()
201 print " ('nundefsym', %r)" % f.read32()
202 print " ('tocoff', %r)" % f.read32()
203 print " ('ntoc', %r)" % f.read32()
204 print " ('modtaboff', %r)" % f.read32()
205 print " ('nmodtab', %r)" % f.read32()
206 print " ('extrefsymoff', %r)" % f.read32()
207 print " ('nextrefsyms', %r)" % f.read32()
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000208 indirectsymoff = f.read32()
209 print " ('indirectsymoff', %r)" % indirectsymoff
210 nindirectsyms = f.read32()
211 print " ('nindirectsyms', %r)" % nindirectsyms
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000212 print " ('extreloff', %r)" % f.read32()
213 print " ('nextrel', %r)" % f.read32()
214 print " ('locreloff', %r)" % f.read32()
215 print " ('nlocrel', %r)" % f.read32()
216
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000217 prev_pos = f.tell()
218
219 f.seek(indirectsymoff)
220 print " ('_indirect_symbols', ["
221 for i in range(nindirectsyms):
222 print " # Indirect Symbol %r" % i
Daniel Dunbar573e5362009-08-26 04:28:45 +0000223 print " (('symbol_index', %#x),)," % f.read32()
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000224 print " ])"
225
226 f.seek(prev_pos)
227
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000228def dumpSection(f, i, opts, is64Bit):
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000229 print " # Section %r" % i
230 print " (('section_name', %r)" % f.read(16)
231 print " ('segment_name', %r)" % f.read(16)
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000232 if is64Bit:
233 print " ('address', %r)" % f.read64()
234 size = f.read64()
235 print " ('size', %r)" % size
236 else:
237 print " ('address', %r)" % f.read32()
238 size = f.read32()
239 print " ('size', %r)" % size
Daniel Dunbar6c2e2d12009-08-26 13:57:44 +0000240 offset = f.read32()
241 print " ('offset', %r)" % offset
242 print " ('alignment', %r)" % f.read32()
243 reloc_offset = f.read32()
244 print " ('reloc_offset', %r)" % reloc_offset
245 num_reloc = f.read32()
246 print " ('num_reloc', %r)" % num_reloc
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000247 print " ('flags', %#x)" % f.read32()
248 print " ('reserved1', %r)" % f.read32()
249 print " ('reserved2', %r)" % f.read32()
Daniel Dunbarf0a0be42010-03-13 22:10:11 +0000250 if is64Bit:
251 print " ('reserved3', %r)" % f.read32()
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000252 print " ),"
Daniel Dunbar6c2e2d12009-08-26 13:57:44 +0000253
254 prev_pos = f.tell()
255
256 f.seek(reloc_offset)
257 print " ('_relocations', ["
258 for i in range(num_reloc):
259 print " # Relocation %r" % i
260 print " (('word-0', %#x)," % f.read32()
261 print " ('word-1', %#x))," % f.read32()
262 print " ])"
263
264 if opts.dumpSectionData:
265 f.seek(offset)
266 print " ('_section_data', %r)" % f.read(size)
267
268 f.seek(prev_pos)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000269
270def main():
271 from optparse import OptionParser, OptionGroup
272 parser = OptionParser("usage: %prog [options] {files}")
Daniel Dunbar6c2e2d12009-08-26 13:57:44 +0000273 parser.add_option("", "--dump-section-data", dest="dumpSectionData",
274 help="Dump the contents of sections",
275 action="store_true", default=False)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000276 (opts, args) = parser.parse_args()
277
278 if not args:
279 args.append('-')
280
281 for arg in args:
282 dumpmacho(arg, opts)
283
284if __name__ == '__main__':
285 main()