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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 Dunbar8906ff12009-08-22 07:22:36 +000015
16 self.string_table = None
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000017
18 def setLSB(self, isLSB):
19 self.isLSB = bool(isLSB)
20
21 def tell(self):
Daniel Dunbar8906ff12009-08-22 07:22:36 +000022 return self.file.tell()
23
24 def seek(self, pos):
25 self.file.seek(pos)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000026
27 def read(self, N):
28 data = self.file.read(N)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000029 if len(data) != N:
30 raise ValueError,"Out of data!"
31 return data
32
Daniel Dunbar8906ff12009-08-22 07:22:36 +000033 def read8(self):
34 return ord(self.read(1))
35
36 def read16(self):
37 return struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0]
38
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000039 def read32(self):
Daniel Dunbar8333a8a2009-08-22 09:28:33 +000040 # Force to 32-bit, if possible; otherwise these might be long ints on a
41 # big-endian platform. FIXME: Why???
42 Value = struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0]
43 return int(Value)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000044
Daniel Dunbar8906ff12009-08-22 07:22:36 +000045 def registerStringTable(self, strings):
46 if self.string_table is not None:
47 raise ValueError,"%s: warning: multiple string tables" % sys.argv[0]
48
49 self.string_table = strings
50
51 def getString(self, index):
52 if self.string_table is None:
53 raise ValueError,"%s: warning: no string table registered" % sys.argv[0]
54
55 end = self.string_table.index('\x00', index)
56 return self.string_table[index:end]
57
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000058def dumpmacho(path, opts):
59 f = Reader(path)
60
61 magic = f.read(4)
62 if magic == '\xFE\xED\xFA\xCE':
63 f.setLSB(False)
64 elif magic == '\xCE\xFA\xED\xFE':
65 f.setLSB(True)
66 else:
67 raise ValueError,"Not a Mach-O object file: %r (bad magic)" % path
68
69 print "('cputype', %r)" % f.read32()
70 print "('cpusubtype', %r)" % f.read32()
71 filetype = f.read32()
72 print "('filetype', %r)" % filetype
73
74 numLoadCommands = f.read32()
75 print "('num_load_commands', %r)" % filetype
76
77 loadCommandsSize = f.read32()
78 print "('load_commands_size', %r)" % loadCommandsSize
79
80 print "('flag', %r)" % f.read32()
81
82 start = f.tell()
83
84 print "('load_commands', ["
85 for i in range(numLoadCommands):
86 dumpLoadCommand(f, i, opts)
87 print "])"
88
89 if f.tell() - start != loadCommandsSize:
Daniel Dunbar8906ff12009-08-22 07:22:36 +000090 raise ValueError,"%s: warning: invalid load commands size: %r" % (sys.argv[0], loadCommandsSize)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +000091
92def dumpLoadCommand(f, i, opts):
93 start = f.tell()
94
95 print " # Load Command %r" % i
96 cmd = f.read32()
97 print " (('command', %r)" % cmd
98 cmdSize = f.read32()
99 print " ('size', %r)" % cmdSize
100
101 if cmd == 1:
102 dumpSegmentLoadCommand32(f, opts)
103 elif cmd == 2:
104 dumpSymtabCommand(f, opts)
105 elif cmd == 11:
106 dumpDysymtabCommand(f, opts)
Daniel Dunbar3bc1b192009-10-24 20:32:36 +0000107 elif cmd == 27:
108 import uuid
109 print " ('uuid', %s)" % uuid.UUID(bytes=f.read(16))
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000110 else:
111 print >>sys.stderr,"%s: warning: unknown load command: %r" % (sys.argv[0], cmd)
112 f.read(cmdSize - 8)
113 print " ),"
114
115 if f.tell() - start != cmdSize:
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000116 raise ValueError,"%s: warning: invalid load command size: %r" % (sys.argv[0], cmdSize)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000117
118def dumpSegmentLoadCommand32(f, opts):
119 print " ('segment_name', %r)" % f.read(16)
120 print " ('vm_addr', %r)" % f.read32()
121 print " ('vm_size', %r)" % f.read32()
122 print " ('file_offset', %r)" % f.read32()
123 print " ('file_size', %r)" % f.read32()
124 print " ('maxprot', %r)" % f.read32()
125 print " ('initprot', %r)" % f.read32()
126 numSections = f.read32()
127 print " ('num_sections', %r)" % numSections
128 print " ('flags', %r)" % f.read32()
129
130 print " ('sections', ["
131 for i in range(numSections):
132 dumpSection32(f, i, opts)
133 print " ])"
134
135def dumpSymtabCommand(f, opts):
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000136 symoff = f.read32()
137 print " ('symoff', %r)" % symoff
138 nsyms = f.read32()
139 print " ('nsyms', %r)" % nsyms
140 stroff = f.read32()
141 print " ('stroff', %r)" % stroff
142 strsize = f.read32()
143 print " ('strsize', %r)" % strsize
144
145 prev_pos = f.tell()
146
147 f.seek(stroff)
148 string_data = f.read(strsize)
149 print " ('_string_data', %r)" % string_data
150
151 f.registerStringTable(string_data)
152
153 f.seek(symoff)
154 print " ('_symbols', ["
155 for i in range(nsyms):
156 dumpNlist32(f, i, opts)
157 print " ])"
158
159 f.seek(prev_pos)
160
161def dumpNlist32(f, i, opts):
162 print " # Symbol %r" % i
163 n_strx = f.read32()
164 print " (('n_strx', %r)" % n_strx
165 n_type = f.read8()
166 print " ('n_type', %#x)" % n_type
167 n_sect = f.read8()
Daniel Dunbard889ac32009-08-22 10:09:17 +0000168 print " ('n_sect', %r)" % n_sect
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000169 n_desc = f.read16()
170 print " ('n_desc', %r)" % n_desc
171 n_value = f.read32()
172 print " ('n_value', %r)" % n_value
173 print " ('_string', %r)" % f.getString(n_strx)
174 print " ),"
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000175
176def dumpDysymtabCommand(f, opts):
177 print " ('ilocalsym', %r)" % f.read32()
178 print " ('nlocalsym', %r)" % f.read32()
179 print " ('iextdefsym', %r)" % f.read32()
180 print " ('nextdefsym', %r)" % f.read32()
181 print " ('iundefsym', %r)" % f.read32()
182 print " ('nundefsym', %r)" % f.read32()
183 print " ('tocoff', %r)" % f.read32()
184 print " ('ntoc', %r)" % f.read32()
185 print " ('modtaboff', %r)" % f.read32()
186 print " ('nmodtab', %r)" % f.read32()
187 print " ('extrefsymoff', %r)" % f.read32()
188 print " ('nextrefsyms', %r)" % f.read32()
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000189 indirectsymoff = f.read32()
190 print " ('indirectsymoff', %r)" % indirectsymoff
191 nindirectsyms = f.read32()
192 print " ('nindirectsyms', %r)" % nindirectsyms
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000193 print " ('extreloff', %r)" % f.read32()
194 print " ('nextrel', %r)" % f.read32()
195 print " ('locreloff', %r)" % f.read32()
196 print " ('nlocrel', %r)" % f.read32()
197
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000198 prev_pos = f.tell()
199
200 f.seek(indirectsymoff)
201 print " ('_indirect_symbols', ["
202 for i in range(nindirectsyms):
203 print " # Indirect Symbol %r" % i
Daniel Dunbar573e5362009-08-26 04:28:45 +0000204 print " (('symbol_index', %#x),)," % f.read32()
Daniel Dunbar8906ff12009-08-22 07:22:36 +0000205 print " ])"
206
207 f.seek(prev_pos)
208
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000209def dumpSection32(f, i, opts):
210 print " # Section %r" % i
211 print " (('section_name', %r)" % f.read(16)
212 print " ('segment_name', %r)" % f.read(16)
213 print " ('address', %r)" % f.read32()
Daniel Dunbar6c2e2d12009-08-26 13:57:44 +0000214 size = f.read32()
215 print " ('size', %r)" % size
216 offset = f.read32()
217 print " ('offset', %r)" % offset
218 print " ('alignment', %r)" % f.read32()
219 reloc_offset = f.read32()
220 print " ('reloc_offset', %r)" % reloc_offset
221 num_reloc = f.read32()
222 print " ('num_reloc', %r)" % num_reloc
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000223 print " ('flags', %#x)" % f.read32()
224 print " ('reserved1', %r)" % f.read32()
225 print " ('reserved2', %r)" % f.read32()
226 print " ),"
Daniel Dunbar6c2e2d12009-08-26 13:57:44 +0000227
228 prev_pos = f.tell()
229
230 f.seek(reloc_offset)
231 print " ('_relocations', ["
232 for i in range(num_reloc):
233 print " # Relocation %r" % i
234 print " (('word-0', %#x)," % f.read32()
235 print " ('word-1', %#x))," % f.read32()
236 print " ])"
237
238 if opts.dumpSectionData:
239 f.seek(offset)
240 print " ('_section_data', %r)" % f.read(size)
241
242 f.seek(prev_pos)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000243
244def main():
245 from optparse import OptionParser, OptionGroup
246 parser = OptionParser("usage: %prog [options] {files}")
Daniel Dunbar6c2e2d12009-08-26 13:57:44 +0000247 parser.add_option("", "--dump-section-data", dest="dumpSectionData",
248 help="Dump the contents of sections",
249 action="store_true", default=False)
Daniel Dunbarfb4a6b32009-08-21 09:11:24 +0000250 (opts, args) = parser.parse_args()
251
252 if not args:
253 args.append('-')
254
255 for arg in args:
256 dumpmacho(arg, opts)
257
258if __name__ == '__main__':
259 main()