aboutsummaryrefslogtreecommitdiff
path: root/src/tools/mac/dump_syms/macho_dump.cc
blob: fcef37c5e62f6e16a97b23c832fb7328215014a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
// Copyright (c) 2010, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>

// macho_dump.cc: Dump the contents of a Mach-O file. This is mostly
// a test program for the Mach_O::FatReader and Mach_O::Reader classes.

#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <mach-o/arch.h>
#include <sys/mman.h>
#include <stdint.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>

#include <sstream>
#include <string>
#include <vector>

#include "common/byte_cursor.h"
#include "common/mac/macho_reader.h"

using google_breakpad::ByteBuffer;
using std::ostringstream;
using std::string;
using std::vector;

namespace {
namespace mach_o = google_breakpad::mach_o;

string program_name;

int check_syscall(int result, const char *operation, const char *filename) {
  if (result < 0) {
    fprintf(stderr, "%s: %s '%s': %s\n",
            program_name.c_str(), operation,
            filename, strerror(errno));
    exit(1);
  }
  return result;
}

class DumpSection: public mach_o::Reader::SectionHandler {
 public:
  DumpSection() : index_(0) { }
  bool HandleSection(const mach_o::Section &section) {
    printf("        section %d '%s' in segment '%s'\n"
           "          address: 0x%llx\n"
           "          alignment: 1 << %d B\n"
           "          flags: %d\n"
           "          size: %ld\n",
           index_++, section.section_name.c_str(), section.segment_name.c_str(),
           section.address, section.align,
           mach_o::SectionFlags(section.flags),
           section.contents.Size());
    return true;
  }
         
 private:
  int index_;
};

class DumpCommand: public mach_o::Reader::LoadCommandHandler {
 public:
  DumpCommand(mach_o::Reader *reader) : reader_(reader), index_(0) { }
  bool UnknownCommand(mach_o::LoadCommandType type,
                      const ByteBuffer &contents) {
    printf("      load command %d: %d", index_++, type);
    return true;
  }
  bool SegmentCommand(const mach_o::Segment &segment) {
    printf("      load command %d: %s-bit segment '%s'\n"
           "        address: 0x%llx\n"
           "        memory size: 0x%llx\n"
           "        maximum protection: 0x%x\n"
           "        initial protection: 0x%x\n"
           "        flags: %d\n"
           "        section_list size: %ld B\n",
           index_++, (segment.bits_64 ? "64" : "32"), segment.name.c_str(),
           segment.vmaddr, segment.vmsize, segment.maxprot,
           segment.initprot, mach_o::SegmentFlags(segment.flags),
           segment.section_list.Size());
           
    DumpSection dump_section;
    return reader_->WalkSegmentSections(segment, &dump_section);
  }
 private:
  mach_o::Reader *reader_;
  int index_;
};

void DumpFile(const char *filename) {
  int fd = check_syscall(open(filename, O_RDONLY), "opening", filename);
  struct stat attributes;
  check_syscall(fstat(fd, &attributes),
                "getting file attributes for", filename);
  void *mapping = mmap(NULL, attributes.st_size, PROT_READ,
                       MAP_PRIVATE, fd, 0);
  close(fd);
  check_syscall(mapping == (void *)-1 ? -1 : 0,
                "mapping contents of", filename);

  mach_o::FatReader::Reporter fat_reporter(filename);
  mach_o::FatReader fat_reader(&fat_reporter);
  if (!fat_reader.Read(reinterpret_cast<uint8_t *>(mapping),
                       attributes.st_size)) {
    exit(1);
  }
  printf("filename: %s\n", filename);
  size_t object_files_size;
  struct fat_arch *object_files = fat_reader.object_files(&object_files_size);
  printf("  object file count: %ld\n", object_files_size);
  for (size_t i = 0; i < object_files_size; i++) {
    const struct fat_arch &file = object_files[i];
    const NXArchInfo *fat_arch_info
      = NXGetArchInfoFromCpuType(file.cputype, file.cpusubtype);
    printf("\n  object file %ld:\n"
           "    fat header:\n:"
           "      CPU type: %s (%s)\n"
           "      size: %d B\n"
           "      alignment: 1<<%d B\n",
           i, fat_arch_info->name, fat_arch_info->description,
           file.size, file.align);

    ostringstream name;
    name << filename;
    if (object_files_size > 1)
      name << ", object file #" << i;
    ByteBuffer file_contents(reinterpret_cast<uint8_t *>(mapping)
                             + file.offset, file.size);
    mach_o::Reader::Reporter reporter(name.str());
    mach_o::Reader reader(&reporter);
    if (!reader.Read(file_contents, file.cputype, file.cpusubtype)) {
      exit(1);
    }

    const NXArchInfo *macho_arch_info =
      NXGetArchInfoFromCpuType(reader.cpu_type(),
                               reader.cpu_subtype());
    printf("    Mach-O header:\n"
           "      word size: %s\n" 
           "      CPU type: %s (%s)\n"
           "      File type: %d\n"
           "      flags: %x\n",
           (reader.bits_64() ? "64 bits" : "32 bits"),
           macho_arch_info->name, macho_arch_info->description,
           reader.file_type(), reader.flags());

    DumpCommand dump_command(&reader);
    reader.WalkLoadCommands(&dump_command);
  }
  munmap(mapping, attributes.st_size);
}

}  // namespace

int main(int argc, char **argv) {
  program_name = basename(argv[0]);
  if (argc == 1) {
    fprintf(stderr, "Usage: %s FILE ...\n"
            "Dump the contents of the Mach-O or fat binary files "
            "'FILE ...'.\n", program_name.c_str());
  }
  for (int i = 1; i < argc; i++) {
    DumpFile(argv[i]);
  }
}