aboutsummaryrefslogtreecommitdiff
path: root/src/processor/minidump_processor.cc
blob: 46243f88aa27666b7e25b31ad723ea34baf460e5 (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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
// Copyright (c) 2006, 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.

#include <cassert>
#include <cstdio>

#include "google_breakpad/processor/minidump_processor.h"
#include "google_breakpad/processor/call_stack.h"
#include "google_breakpad/processor/minidump.h"
#include "google_breakpad/processor/process_state.h"
#include "processor/logging.h"
#include "processor/scoped_ptr.h"
#include "processor/stackwalker_x86.h"

namespace google_breakpad {

MinidumpProcessor::MinidumpProcessor(SymbolSupplier *supplier,
                                     SourceLineResolverInterface *resolver)
    : supplier_(supplier), resolver_(resolver) {
}

MinidumpProcessor::~MinidumpProcessor() {
}

ProcessResult MinidumpProcessor::Process(
    Minidump *dump, ProcessState *process_state) {
  assert(dump);
  assert(process_state);

  process_state->Clear();

  const MDRawHeader *header = dump->header();
  if (!header) {
    BPLOG(ERROR) << "Minidump " << dump->path() << " has no header";
    return PROCESS_ERROR_NO_MINIDUMP_HEADER;
  }
  process_state->time_date_stamp_ = header->time_date_stamp;

  bool has_cpu_info = GetCPUInfo(dump, &process_state->system_info_);
  bool has_os_info = GetOSInfo(dump, &process_state->system_info_);

  u_int32_t dump_thread_id = 0;
  bool has_dump_thread = false;
  u_int32_t requesting_thread_id = 0;
  bool has_requesting_thread = false;

  MinidumpBreakpadInfo *breakpad_info = dump->GetBreakpadInfo();
  if (breakpad_info) {
    has_dump_thread = breakpad_info->GetDumpThreadID(&dump_thread_id);
    has_requesting_thread =
        breakpad_info->GetRequestingThreadID(&requesting_thread_id);
  }

  MinidumpException *exception = dump->GetException();
  if (exception) {
    process_state->crashed_ = true;
    has_requesting_thread = exception->GetThreadID(&requesting_thread_id);

    process_state->crash_reason_ = GetCrashReason(
        dump, &process_state->crash_address_);
  }

  MinidumpModuleList *module_list = dump->GetModuleList();

  // Put a copy of the module list into ProcessState object.  This is not
  // necessarily a MinidumpModuleList, but it adheres to the CodeModules
  // interface, which is all that ProcessState needs to expose.
  if (module_list)
    process_state->modules_ = module_list->Copy();

  MinidumpThreadList *threads = dump->GetThreadList();
  if (!threads) {
    BPLOG(ERROR) << "Minidump " << dump->path() << " has no thread list";
    return PROCESS_ERROR_NO_THREAD_LIST;
  }

  BPLOG(INFO) << "Minidump " << dump->path() << " has " <<
      (has_cpu_info           ? "" : "no ") << "CPU info, " <<
      (has_os_info            ? "" : "no ") << "OS info, " <<
      (breakpad_info != NULL  ? "" : "no ") << "Breakpad info, " <<
      (exception != NULL      ? "" : "no ") << "exception, " <<
      (module_list != NULL    ? "" : "no ") << "module list, " <<
      (threads != NULL        ? "" : "no ") << "thread list, " <<
      (has_dump_thread        ? "" : "no ") << "dump thread, and " <<
      (has_requesting_thread  ? "" : "no ") << "requesting thread";

  bool interrupted = false;
  bool found_requesting_thread = false;
  unsigned int thread_count = threads->thread_count();
  for (unsigned int thread_index = 0;
       thread_index < thread_count;
       ++thread_index) {
    char thread_string_buffer[64];
    snprintf(thread_string_buffer, sizeof(thread_string_buffer), "%d/%d",
             thread_index, thread_count);
    string thread_string = dump->path() + ":" + thread_string_buffer;

    MinidumpThread *thread = threads->GetThreadAtIndex(thread_index);
    if (!thread) {
      BPLOG(ERROR) << "Could not get thread for " << thread_string;
      return PROCESS_ERROR_GETTING_THREAD;
    }

    u_int32_t thread_id;
    if (!thread->GetThreadID(&thread_id)) {
      BPLOG(ERROR) << "Could not get thread ID for " << thread_string;
      return PROCESS_ERROR_GETTING_THREAD_ID;
    }

    thread_string += " id " + HexString(thread_id);
    BPLOG(INFO) << "Looking at thread " << thread_string;

    // If this thread is the thread that produced the minidump, don't process
    // it.  Because of the problems associated with a thread producing a
    // dump of itself (when both its context and its stack are in flux),
    // processing that stack wouldn't provide much useful data.
    if (has_dump_thread && thread_id == dump_thread_id) {
      continue;
    }

    MinidumpContext *context = thread->GetContext();

    if (has_requesting_thread && thread_id == requesting_thread_id) {
      if (found_requesting_thread) {
        // There can't be more than one requesting thread.
        BPLOG(ERROR) << "Duplicate requesting thread: " << thread_string;
        return PROCESS_ERROR_DUPLICATE_REQUESTING_THREADS;
      }

      // Use processed_state->threads_.size() instead of thread_index.
      // thread_index points to the thread index in the minidump, which
      // might be greater than the thread index in the threads vector if
      // any of the minidump's threads are skipped and not placed into the
      // processed threads vector.  The thread vector's current size will
      // be the index of the current thread when it's pushed into the
      // vector.
      process_state->requesting_thread_ = process_state->threads_.size();

      found_requesting_thread = true;

      if (process_state->crashed_) {
        // Use the exception record's context for the crashed thread, instead
        // of the thread's own context.  For the crashed thread, the thread's
        // own context is the state inside the exception handler.  Using it
        // would not result in the expected stack trace from the time of the
        // crash.
        context = exception->GetContext();
      }
    }

    MinidumpMemoryRegion *thread_memory = thread->GetMemory();
    if (!thread_memory) {
      BPLOG(ERROR) << "No memory region for " << thread_string;
      return PROCESS_ERROR_NO_MEMORY_FOR_THREAD;
    }

    // Use process_state->modules_ instead of module_list, because the
    // |modules| argument will be used to populate the |module| fields in
    // the returned StackFrame objects, which will be placed into the
    // returned ProcessState object.  module_list's lifetime is only as
    // long as the Minidump object: it will be deleted when this function
    // returns.  process_state->modules_ is owned by the ProcessState object
    // (just like the StackFrame objects), and is much more suitable for this
    // task.
    scoped_ptr<Stackwalker> stackwalker(
        Stackwalker::StackwalkerForCPU(process_state->system_info(),
                                       context,
                                       thread_memory,
                                       process_state->modules_,
                                       supplier_,
                                       resolver_));
    if (!stackwalker.get()) {
      BPLOG(ERROR) << "No stackwalker for " << thread_string;
      return PROCESS_ERROR_NO_STACKWALKER_FOR_THREAD;
    }

    scoped_ptr<CallStack> stack(new CallStack());
    if (!stackwalker->Walk(stack.get())) {
      BPLOG(INFO) << "Stackwalker interrupt (missing symbols?) at " <<
          thread_string;
      interrupted = true;
    }
    process_state->threads_.push_back(stack.release());
    process_state->thread_memory_regions_.push_back(thread_memory);
  }

  if (interrupted) {
    BPLOG(INFO) << "Processing interrupted for " << dump->path();
    return PROCESS_SYMBOL_SUPPLIER_INTERRUPTED;
  }

  // If a requesting thread was indicated, it must be present.
  if (has_requesting_thread && !found_requesting_thread) {
    // Don't mark as an error, but invalidate the requesting thread
    BPLOG(ERROR) << "Minidump indicated requesting thread " <<
        HexString(requesting_thread_id) << ", not found in " <<
        dump->path();
    process_state->requesting_thread_ = -1;
  }

  BPLOG(INFO) << "Processed " << dump->path();
  return PROCESS_OK;
}

ProcessResult MinidumpProcessor::Process(
    const string &minidump_file, ProcessState *process_state) {
  BPLOG(INFO) << "Processing minidump in file " << minidump_file;

  Minidump dump(minidump_file);
  if (!dump.Read()) {
     BPLOG(ERROR) << "Minidump " << dump.path() << " could not be read";
     return PROCESS_ERROR_MINIDUMP_NOT_FOUND;
   }

  return Process(&dump, process_state);
}

// Returns the MDRawSystemInfo from a minidump, or NULL if system info is
// not available from the minidump.  If system_info is non-NULL, it is used
// to pass back the MinidumpSystemInfo object.
static const MDRawSystemInfo* GetSystemInfo(Minidump *dump,
                                            MinidumpSystemInfo **system_info) {
  MinidumpSystemInfo *minidump_system_info = dump->GetSystemInfo();
  if (!minidump_system_info)
    return NULL;

  if (system_info)
    *system_info = minidump_system_info;

  return minidump_system_info->system_info();
}

// static
bool MinidumpProcessor::GetCPUInfo(Minidump *dump, SystemInfo *info) {
  assert(dump);
  assert(info);

  info->cpu.clear();
  info->cpu_info.clear();

  MinidumpSystemInfo *system_info;
  const MDRawSystemInfo *raw_system_info = GetSystemInfo(dump, &system_info);
  if (!raw_system_info)
    return false;

  switch (raw_system_info->processor_architecture) {
    case MD_CPU_ARCHITECTURE_X86:
    case MD_CPU_ARCHITECTURE_AMD64: {
      if (raw_system_info->processor_architecture ==
          MD_CPU_ARCHITECTURE_X86)
        info->cpu = "x86";
      else
        info->cpu = "amd64";

      const string *cpu_vendor = system_info->GetCPUVendor();
      if (cpu_vendor) {
        info->cpu_info = *cpu_vendor;
        info->cpu_info.append(" ");
      }

      char x86_info[36];
      snprintf(x86_info, sizeof(x86_info), "family %u model %u stepping %u",
               raw_system_info->processor_level,
               raw_system_info->processor_revision >> 8,
               raw_system_info->processor_revision & 0xff);
      info->cpu_info.append(x86_info);
      break;
    }

    case MD_CPU_ARCHITECTURE_PPC: {
      info->cpu = "ppc";
      break;
    }

    case MD_CPU_ARCHITECTURE_SPARC: {
      info->cpu = "sparc";
      break;
    }

    default: {
      // Assign the numeric architecture ID into the CPU string.
      char cpu_string[7];
      snprintf(cpu_string, sizeof(cpu_string), "0x%04x",
               raw_system_info->processor_architecture);
      info->cpu = cpu_string;
      break;
    }
  }

  info->cpu_count = raw_system_info->number_of_processors;

  return true;
}

// static
bool MinidumpProcessor::GetOSInfo(Minidump *dump, SystemInfo *info) {
  assert(dump);
  assert(info);

  info->os.clear();
  info->os_short.clear();
  info->os_version.clear();

  MinidumpSystemInfo *system_info;
  const MDRawSystemInfo *raw_system_info = GetSystemInfo(dump, &system_info);
  if (!raw_system_info)
    return false;

  info->os_short = system_info->GetOS();

  switch (raw_system_info->platform_id) {
    case MD_OS_WIN32_NT: {
      info->os = "Windows NT";
      break;
    }

    case MD_OS_WIN32_WINDOWS: {
      info->os = "Windows";
      break;
    }

    case MD_OS_MAC_OS_X: {
      info->os = "Mac OS X";
      break;
    }

    case MD_OS_LINUX: {
      info->os = "Linux";
      break;
    }

    case MD_OS_SOLARIS: {
      info->os = "Solaris";
      break;
    }

    default: {
      // Assign the numeric platform ID into the OS string.
      char os_string[11];
      snprintf(os_string, sizeof(os_string), "0x%08x",
               raw_system_info->platform_id);
      info->os = os_string;
      break;
    }
  }

  char os_version_string[33];
  snprintf(os_version_string, sizeof(os_version_string), "%u.%u.%u",
           raw_system_info->major_version,
           raw_system_info->minor_version,
           raw_system_info->build_number);
  info->os_version = os_version_string;

  const string *csd_version = system_info->GetCSDVersion();
  if (csd_version) {
    info->os_version.append(" ");
    info->os_version.append(*csd_version);
  }

  return true;
}

// static
string MinidumpProcessor::GetCrashReason(Minidump *dump, u_int64_t *address) {
  MinidumpException *exception = dump->GetException();
  if (!exception)
    return "";

  const MDRawExceptionStream *raw_exception = exception->exception();
  if (!raw_exception)
    return "";

  if (address)
    *address = raw_exception->exception_record.exception_address;

  // The reason value is OS-specific and possibly CPU-specific.  Set up
  // sensible numeric defaults for the reason string in case we can't
  // map the codes to a string (because there's no system info, or because
  // it's an unrecognized platform, or because it's an unrecognized code.)
  char reason_string[24];
  u_int32_t exception_code = raw_exception->exception_record.exception_code;
  u_int32_t exception_flags = raw_exception->exception_record.exception_flags;
  snprintf(reason_string, sizeof(reason_string), "0x%08x / 0x%08x",
           exception_code, exception_flags);
  string reason = reason_string;

  const MDRawSystemInfo *raw_system_info = GetSystemInfo(dump, NULL);
  if (!raw_system_info)
    return reason;

  switch (raw_system_info->platform_id) {
    case MD_OS_MAC_OS_X: {
      char flags_string[11];
      snprintf(flags_string, sizeof(flags_string), "0x%08x", exception_flags);
      switch (exception_code) {
        case MD_EXCEPTION_MAC_BAD_ACCESS:
          reason = "EXC_BAD_ACCESS / ";
          switch (exception_flags) {
            case MD_EXCEPTION_CODE_MAC_INVALID_ADDRESS:
              reason.append("KERN_INVALID_ADDRESS");
              break;
            case MD_EXCEPTION_CODE_MAC_PROTECTION_FAILURE:
              reason.append("KERN_PROTECTION_FAILURE");
              break;
            case MD_EXCEPTION_CODE_MAC_NO_ACCESS:
              reason.append("KERN_NO_ACCESS");
              break;
            case MD_EXCEPTION_CODE_MAC_MEMORY_FAILURE:
              reason.append("KERN_MEMORY_FAILURE");
              break;
            case MD_EXCEPTION_CODE_MAC_MEMORY_ERROR:
              reason.append("KERN_MEMORY_ERROR");
              break;
            // These are ppc only but shouldn't be a problem as they're
            // unused on x86
            case MD_EXCEPTION_CODE_MAC_PPC_VM_PROT_READ:
              reason.append("EXC_PPC_VM_PROT_READ");
              break;
            case MD_EXCEPTION_CODE_MAC_PPC_BADSPACE:
              reason.append("EXC_PPC_BADSPACE");
              break;
            case MD_EXCEPTION_CODE_MAC_PPC_UNALIGNED:
              reason.append("EXC_PPC_UNALIGNED");
              break;
            default:
              reason.append(flags_string);
              BPLOG(INFO) << "Unknown exception reason " << reason;
              break;
          }
          break;
        case MD_EXCEPTION_MAC_BAD_INSTRUCTION:
          reason = "EXC_BAD_INSTRUCTION / ";
          switch (raw_system_info->processor_architecture) {
            case MD_CPU_ARCHITECTURE_PPC: {
              switch (exception_flags) {
                case MD_EXCEPTION_CODE_MAC_PPC_INVALID_SYSCALL:
                  reason.append("EXC_PPC_INVALID_SYSCALL");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_UNIMPLEMENTED_INSTRUCTION:
                  reason.append("EXC_PPC_UNIPL_INST");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_PRIVILEGED_INSTRUCTION:
                  reason.append("EXC_PPC_PRIVINST");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_PRIVILEGED_REGISTER:
                  reason.append("EXC_PPC_PRIVREG");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_TRACE:
                  reason.append("EXC_PPC_TRACE");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_PERFORMANCE_MONITOR:
                  reason.append("EXC_PPC_PERFMON");
                  break;
                default:
                  reason.append(flags_string);
                  BPLOG(INFO) << "Unknown exception reason " << reason;
                  break;
              }
              break;
            }
            case MD_CPU_ARCHITECTURE_X86: {
              switch (exception_flags) {
                case MD_EXCEPTION_CODE_MAC_X86_INVALID_OPERATION:
                  reason.append("EXC_I386_INVOP");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_INVALID_TASK_STATE_SEGMENT:
                  reason.append("EXC_INVTSSFLT");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_SEGMENT_NOT_PRESENT:
                  reason.append("EXC_SEGNPFLT");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_STACK_FAULT:
                  reason.append("EXC_STKFLT");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_GENERAL_PROTECTION_FAULT:
                  reason.append("EXC_GPFLT");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_ALIGNMENT_FAULT:
                  reason.append("EXC_ALIGNFLT");
                  break;
                default:
                  reason.append(flags_string);
                  BPLOG(INFO) << "Unknown exception reason " << reason;
                  break;
              }
              break;
            }
            default:
              reason.append(flags_string);
              BPLOG(INFO) << "Unknown exception reason " << reason;
              break;
          }
          break;
        case MD_EXCEPTION_MAC_ARITHMETIC:
          reason = "EXC_ARITHMETIC / ";
          switch (raw_system_info->processor_architecture) {
            case MD_CPU_ARCHITECTURE_PPC: {
              switch (exception_flags) {
                case MD_EXCEPTION_CODE_MAC_PPC_OVERFLOW:
                  reason.append("EXC_PPC_OVERFLOW");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_ZERO_DIVIDE:
                  reason.append("EXC_PPC_ZERO_DIVIDE");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_FLOAT_INEXACT:
                  reason.append("EXC_FLT_INEXACT");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_FLOAT_ZERO_DIVIDE:
                  reason.append("EXC_PPC_FLT_ZERO_DIVIDE");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_FLOAT_UNDERFLOW:
                  reason.append("EXC_PPC_FLT_UNDERFLOW");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_FLOAT_OVERFLOW:
                  reason.append("EXC_PPC_FLT_OVERFLOW");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_FLOAT_NOT_A_NUMBER:
                  reason.append("EXC_PPC_FLT_NOT_A_NUMBER");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_NO_EMULATION:
                  reason.append("EXC_PPC_NOEMULATION");
                  break;
                case MD_EXCEPTION_CODE_MAC_PPC_ALTIVEC_ASSIST:
                  reason.append("EXC_PPC_ALTIVECASSIST");
                default:
                  reason.append(flags_string);
                  BPLOG(INFO) << "Unknown exception reason " << reason;
                  break;
              }
              break;
            }
            case MD_CPU_ARCHITECTURE_X86: {
              switch (exception_flags) {
                case MD_EXCEPTION_CODE_MAC_X86_DIV:
                  reason.append("EXC_I386_DIV");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_INTO:
                  reason.append("EXC_I386_INTO");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_NOEXT:
                  reason.append("EXC_I386_NOEXT");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_EXTOVR:
                  reason.append("EXC_I386_EXTOVR");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_EXTERR:
                  reason.append("EXC_I386_EXTERR");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_EMERR:
                  reason.append("EXC_I386_EMERR");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_BOUND:
                  reason.append("EXC_I386_BOUND");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_SSEEXTERR:
                  reason.append("EXC_I386_SSEEXTERR");
                  break;
                default:
                  reason.append(flags_string);
                  BPLOG(INFO) << "Unknown exception reason " << reason;
                  break;
              }
              break;
            }
            default:
              reason.append(flags_string);
              BPLOG(INFO) << "Unknown exception reason " << reason;
              break;
          }
          break;
        case MD_EXCEPTION_MAC_EMULATION:
          reason = "EXC_EMULATION / ";
          reason.append(flags_string);
          break;
        case MD_EXCEPTION_MAC_SOFTWARE:
          reason = "EXC_SOFTWARE / ";
          switch (exception_flags) {
            // These are ppc only but shouldn't be a problem as they're
            // unused on x86
            case MD_EXCEPTION_CODE_MAC_PPC_TRAP:
              reason.append("EXC_PPC_TRAP");
              break;
            case MD_EXCEPTION_CODE_MAC_PPC_MIGRATE:
              reason.append("EXC_PPC_MIGRATE");
              break;
            default:
              reason.append(flags_string);
              BPLOG(INFO) << "Unknown exception reason " << reason;
              break;
          }
          break;
        case MD_EXCEPTION_MAC_BREAKPOINT:
          reason = "EXC_BREAKPOINT / ";
          switch (raw_system_info->processor_architecture) {
            case MD_CPU_ARCHITECTURE_PPC: {
              switch (exception_flags) {
                case MD_EXCEPTION_CODE_MAC_PPC_BREAKPOINT:
                  reason.append("EXC_PPC_BREAKPOINT");
                  break;
                default:
                  reason.append(flags_string);
                  BPLOG(INFO) << "Unknown exception reason " << reason;
                  break;
              }
              break;
            }
            case MD_CPU_ARCHITECTURE_X86: {
              switch (exception_flags) {
                case MD_EXCEPTION_CODE_MAC_X86_SGL:
                  reason.append("EXC_I386_SGL");
                  break;
                case MD_EXCEPTION_CODE_MAC_X86_BPT:
                  reason.append("EXC_I386_BPT");
                  break;
                default:
                  reason.append(flags_string);
                  BPLOG(INFO) << "Unknown exception reason " << reason;
                  break;
              }
              break;
            }
            default:
              reason.append(flags_string);
              BPLOG(INFO) << "Unknown exception reason " << reason;
              break;
          }
          break;
        case MD_EXCEPTION_MAC_SYSCALL:
          reason = "EXC_SYSCALL / ";
          reason.append(flags_string);
          break;
        case MD_EXCEPTION_MAC_MACH_SYSCALL:
          reason = "EXC_MACH_SYSCALL / ";
          reason.append(flags_string);
          break;
        case MD_EXCEPTION_MAC_RPC_ALERT:
          reason = "EXC_RPC_ALERT / ";
          reason.append(flags_string);
          break;
      }
      break;
    }

    case MD_OS_WIN32_NT:
    case MD_OS_WIN32_WINDOWS: {
      switch (exception_code) {
        case MD_EXCEPTION_CODE_WIN_CONTROL_C:
          reason = "DBG_CONTROL_C";
          break;
        case MD_EXCEPTION_CODE_WIN_GUARD_PAGE_VIOLATION:
          reason = "EXCEPTION_GUARD_PAGE";
          break;
        case MD_EXCEPTION_CODE_WIN_DATATYPE_MISALIGNMENT:
          reason = "EXCEPTION_DATATYPE_MISALIGNMENT";
          break;
        case MD_EXCEPTION_CODE_WIN_BREAKPOINT:
          reason = "EXCEPTION_BREAKPOINT";
          break;
        case MD_EXCEPTION_CODE_WIN_SINGLE_STEP:
          reason = "EXCEPTION_SINGLE_STEP";
          break;
        case MD_EXCEPTION_CODE_WIN_ACCESS_VIOLATION:
          // For EXCEPTION_ACCESS_VIOLATION, Windows puts the address that
          // caused the fault in exception_information[1].
          // exception_information[0] is 0 if the violation was caused by
          // an attempt to read data and 1 if it was an attempt to write
          // data.
          // This information is useful in addition to the code address, which
          // will be present in the crash thread's instruction field anyway.
          reason = "EXCEPTION_ACCESS_VIOLATION";
          if (address &&
              raw_exception->exception_record.number_parameters >= 2) {
            *address =
                raw_exception->exception_record.exception_information[1];
          }
          break;
        case MD_EXCEPTION_CODE_WIN_IN_PAGE_ERROR:
          reason = "EXCEPTION_IN_PAGE_ERROR";
          break;
        case MD_EXCEPTION_CODE_WIN_INVALID_HANDLE:
          reason = "EXCEPTION_INVALID_HANDLE";
          break;
        case MD_EXCEPTION_CODE_WIN_ILLEGAL_INSTRUCTION:
          reason = "EXCEPTION_ILLEGAL_INSTRUCTION";
          break;
        case MD_EXCEPTION_CODE_WIN_NONCONTINUABLE_EXCEPTION:
          reason = "EXCEPTION_NONCONTINUABLE_EXCEPTION";
          break;
        case MD_EXCEPTION_CODE_WIN_INVALID_DISPOSITION:
          reason = "EXCEPTION_INVALID_DISPOSITION";
          break;
        case MD_EXCEPTION_CODE_WIN_ARRAY_BOUNDS_EXCEEDED:
          reason = "EXCEPTION_BOUNDS_EXCEEDED";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_DENORMAL_OPERAND:
          reason = "EXCEPTION_FLT_DENORMAL_OPERAND";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_DIVIDE_BY_ZERO:
          reason = "EXCEPTION_FLT_DIVIDE_BY_ZERO";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_INEXACT_RESULT:
          reason = "EXCEPTION_FLT_INEXACT_RESULT";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_INVALID_OPERATION:
          reason = "EXCEPTION_FLT_INVALID_OPERATION";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_OVERFLOW:
          reason = "EXCEPTION_FLT_OVERFLOW";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_STACK_CHECK:
          reason = "EXCEPTION_FLT_STACK_CHECK";
          break;
        case MD_EXCEPTION_CODE_WIN_FLOAT_UNDERFLOW:
          reason = "EXCEPTION_FLT_UNDERFLOW";
          break;
        case MD_EXCEPTION_CODE_WIN_INTEGER_DIVIDE_BY_ZERO:
          reason = "EXCEPTION_INT_DIVIDE_BY_ZERO";
          break;
        case MD_EXCEPTION_CODE_WIN_INTEGER_OVERFLOW:
          reason = "EXCEPTION_INT_OVERFLOW";
          break;
        case MD_EXCEPTION_CODE_WIN_PRIVILEGED_INSTRUCTION:
          reason = "EXCEPTION_PRIV_INSTRUCTION";
          break;
        case MD_EXCEPTION_CODE_WIN_STACK_OVERFLOW:
          reason = "EXCEPTION_STACK_OVERFLOW";
          break;
        case MD_EXCEPTION_CODE_WIN_POSSIBLE_DEADLOCK:
          reason = "EXCEPTION_POSSIBLE_DEADLOCK";
          break;
        default:
          BPLOG(INFO) << "Unknown exception reason " << reason;
          break;
      }
      break;
    }

    case MD_OS_LINUX: {
      switch (exception_code) {
        case MD_EXCEPTION_CODE_LIN_SIGHUP:
          reason = "SIGHUP";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGINT:
          reason = "SIGINT";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGQUIT:
          reason = "SIGQUIT";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGILL:
          reason = "SIGILL";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGTRAP:
          reason = "SIGTRAP";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGABRT:
          reason = "SIGABRT";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGBUS:
          reason = "SIGBUS";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGFPE:
          reason = "SIGFPE";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGKILL:
          reason = "SIGKILL";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGUSR1:
          reason = "SIGUSR1";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGSEGV:
          reason = "SIGSEGV";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGUSR2:
          reason = "SIGUSR2";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGPIPE:
          reason = "SIGPIPE";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGALRM:
          reason = "SIGALRM";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGTERM:
          reason = "SIGTERM";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGSTKFLT:
          reason = "SIGSTKFLT";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGCHLD:
          reason = "SIGCHLD";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGCONT:
          reason = "SIGCONT";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGSTOP:
          reason = "SIGSTOP";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGTSTP:
          reason = "SIGTSTP";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGTTIN:
          reason = "SIGTTIN";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGTTOU:
          reason = "SIGTTOU";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGURG:
          reason = "SIGURG";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGXCPU:
          reason = "SIGXCPU";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGXFSZ:
          reason = "SIGXFSZ";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGVTALRM:
          reason = "SIGVTALRM";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGPROF:
          reason = "SIGPROF";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGWINCH:
          reason = "SIGWINCH";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGIO:
          reason = "SIGIO";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGPWR:
          reason = "SIGPWR";
          break;
        case MD_EXCEPTION_CODE_LIN_SIGSYS:
          reason = "SIGSYS";
          break;
        default:
          BPLOG(INFO) << "Unknown exception reason " << reason;
          break;
      }
      break;
    }

    case MD_OS_SOLARIS: {
      switch (exception_code) {
        case MD_EXCEPTION_CODE_SOL_SIGHUP:
          reason = "SIGHUP";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGINT:
          reason = "SIGINT";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGQUIT:
          reason = "SIGQUIT";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGILL:
          reason = "SIGILL";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGTRAP:
          reason = "SIGTRAP";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGIOT:
          reason = "SIGIOT | SIGABRT";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGEMT:
          reason = "SIGEMT";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGFPE:
          reason = "SIGFPE";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGKILL:
          reason = "SIGKILL";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGBUS:
          reason = "SIGBUS";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGSEGV:
          reason = "SIGSEGV";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGSYS:
          reason = "SIGSYS";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGPIPE:
          reason = "SIGPIPE";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGALRM:
          reason = "SIGALRM";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGTERM:
          reason = "SIGTERM";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGUSR1:
          reason = "SIGUSR1";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGUSR2:
          reason = "SIGUSR2";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGCLD:
          reason = "SIGCLD | SIGCHLD";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGPWR:
          reason = "SIGPWR";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGWINCH:
          reason = "SIGWINCH";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGURG:
          reason = "SIGURG";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGPOLL:
          reason = "SIGPOLL | SIGIO";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGSTOP:
          reason = "SIGSTOP";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGTSTP:
          reason = "SIGTSTP";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGCONT:
          reason = "SIGCONT";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGTTIN:
          reason = "SIGTTIN";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGTTOU:
          reason = "SIGTTOU";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGVTALRM:
          reason = "SIGVTALRM";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGPROF:
          reason = "SIGPROF";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGXCPU:
          reason = "SIGXCPU";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGXFSZ:
          reason = "SIGXFSZ";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGWAITING:
          reason = "SIGWAITING";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGLWP:
          reason = "SIGLWP";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGFREEZE:
          reason = "SIGFREEZE";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGTHAW:
          reason = "SIGTHAW";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGCANCEL:
          reason = "SIGCANCEL";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGLOST:
          reason = "SIGLOST";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGXRES:
          reason = "SIGXRES";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGJVM1:
          reason = "SIGJVM1";
          break;
        case MD_EXCEPTION_CODE_SOL_SIGJVM2:
          reason = "SIGJVM2";
          break;
        default:
          BPLOG(INFO) << "Unknown exception reason " << reason;
          break;
      }
      break;
    }

    default: {
      BPLOG(INFO) << "Unknown exception reason " << reason;
      break;
    }
  }

  return reason;
}

}  // namespace google_breakpad