-
Notifications
You must be signed in to change notification settings - Fork 22
/
macho.c
1363 lines (1142 loc) · 35.7 KB
/
macho.c
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
// +build darwin
/* elf.c -- Get debug data from a Mach-O file for backtraces.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) 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.
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "config.h"
#include <sys/types.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_MACH_O_DYLD_H
#include <mach-o/dyld.h>
#endif
#include "backtrace.h"
#include "internal.h"
/* Mach-O file header for a 32-bit executable. */
struct macho_header_32
{
uint32_t magic; /* Magic number (MACH_O_MAGIC_32) */
uint32_t cputype; /* CPU type */
uint32_t cpusubtype; /* CPU subtype */
uint32_t filetype; /* Type of file (object, executable) */
uint32_t ncmds; /* Number of load commands */
uint32_t sizeofcmds; /* Total size of load commands */
uint32_t flags; /* Flags for special features */
};
/* Mach-O file header for a 64-bit executable. */
struct macho_header_64
{
uint32_t magic; /* Magic number (MACH_O_MAGIC_64) */
uint32_t cputype; /* CPU type */
uint32_t cpusubtype; /* CPU subtype */
uint32_t filetype; /* Type of file (object, executable) */
uint32_t ncmds; /* Number of load commands */
uint32_t sizeofcmds; /* Total size of load commands */
uint32_t flags; /* Flags for special features */
uint32_t reserved; /* Reserved */
};
/* Mach-O file header for a fat executable. */
struct macho_header_fat
{
uint32_t magic; /* Magic number (MACH_O_MH_(MAGIC|CIGAM)_FAT(_64)?) */
uint32_t nfat_arch; /* Number of components */
};
/* Values for the header magic field. */
#define MACH_O_MH_MAGIC_32 0xfeedface
#define MACH_O_MH_MAGIC_64 0xfeedfacf
#define MACH_O_MH_MAGIC_FAT 0xcafebabe
#define MACH_O_MH_CIGAM_FAT 0xbebafeca
#define MACH_O_MH_MAGIC_FAT_64 0xcafebabf
#define MACH_O_MH_CIGAM_FAT_64 0xbfbafeca
/* Value for the header filetype field. */
#define MACH_O_MH_EXECUTE 0x02
#define MACH_O_MH_DYLIB 0x06
#define MACH_O_MH_DSYM 0x0a
/* A component of a fat file. A fat file starts with a
macho_header_fat followed by nfat_arch instances of this
struct. */
struct macho_fat_arch
{
uint32_t cputype; /* CPU type */
uint32_t cpusubtype; /* CPU subtype */
uint32_t offset; /* File offset of this entry */
uint32_t size; /* Size of this entry */
uint32_t align; /* Alignment of this entry */
};
/* A component of a 64-bit fat file. This is used if the magic field
is MAGIC_FAT_64. This is only used when some file size or file
offset is too large to represent in the 32-bit format. */
struct macho_fat_arch_64
{
uint32_t cputype; /* CPU type */
uint32_t cpusubtype; /* CPU subtype */
uint64_t offset; /* File offset of this entry */
uint64_t size; /* Size of this entry */
uint32_t align; /* Alignment of this entry */
uint32_t reserved; /* Reserved */
};
/* Values for the fat_arch cputype field (and the header cputype
field). */
#define MACH_O_CPU_ARCH_ABI64 0x01000000
#define MACH_O_CPU_TYPE_X86 7
#define MACH_O_CPU_TYPE_ARM 12
#define MACH_O_CPU_TYPE_PPC 18
#define MACH_O_CPU_TYPE_X86_64 (MACH_O_CPU_TYPE_X86 | MACH_O_CPU_ARCH_ABI64)
#define MACH_O_CPU_TYPE_ARM64 (MACH_O_CPU_TYPE_ARM | MACH_O_CPU_ARCH_ABI64)
#define MACH_O_CPU_TYPE_PPC64 (MACH_O_CPU_TYPE_PPC | MACH_O_CPU_ARCH_ABI64)
/* The header of a load command. */
struct macho_load_command
{
uint32_t cmd; /* The type of load command */
uint32_t cmdsize; /* Size in bytes of the entire command */
};
/* Values for the load_command cmd field. */
#define MACH_O_LC_SEGMENT 0x01
#define MACH_O_LC_SYMTAB 0x02
#define MACH_O_LC_SEGMENT_64 0x19
#define MACH_O_LC_UUID 0x1b
/* The length of a section of segment name. */
#define MACH_O_NAMELEN (16)
/* LC_SEGMENT load command. */
struct macho_segment_command
{
uint32_t cmd; /* The type of load command (LC_SEGMENT) */
uint32_t cmdsize; /* Size in bytes of the entire command */
char segname[MACH_O_NAMELEN]; /* Segment name */
uint32_t vmaddr; /* Virtual memory address */
uint32_t vmsize; /* Virtual memory size */
uint32_t fileoff; /* Offset of data to be mapped */
uint32_t filesize; /* Size of data in file */
uint32_t maxprot; /* Maximum permitted virtual protection */
uint32_t initprot; /* Initial virtual memory protection */
uint32_t nsects; /* Number of sections in this segment */
uint32_t flags; /* Flags */
};
/* LC_SEGMENT_64 load command. */
struct macho_segment_64_command
{
uint32_t cmd; /* The type of load command (LC_SEGMENT) */
uint32_t cmdsize; /* Size in bytes of the entire command */
char segname[MACH_O_NAMELEN]; /* Segment name */
uint64_t vmaddr; /* Virtual memory address */
uint64_t vmsize; /* Virtual memory size */
uint64_t fileoff; /* Offset of data to be mapped */
uint64_t filesize; /* Size of data in file */
uint32_t maxprot; /* Maximum permitted virtual protection */
uint32_t initprot; /* Initial virtual memory protection */
uint32_t nsects; /* Number of sections in this segment */
uint32_t flags; /* Flags */
};
/* LC_SYMTAB load command. */
struct macho_symtab_command
{
uint32_t cmd; /* The type of load command (LC_SEGMENT) */
uint32_t cmdsize; /* Size in bytes of the entire command */
uint32_t symoff; /* File offset of symbol table */
uint32_t nsyms; /* Number of symbols */
uint32_t stroff; /* File offset of string table */
uint32_t strsize; /* String table size */
};
/* The length of a Mach-O uuid. */
#define MACH_O_UUID_LEN (16)
/* LC_UUID load command. */
struct macho_uuid_command
{
uint32_t cmd; /* Type of load command (LC_UUID) */
uint32_t cmdsize; /* Size in bytes of command */
unsigned char uuid[MACH_O_UUID_LEN]; /* UUID */
};
/* 32-bit section header within a LC_SEGMENT segment. */
struct macho_section
{
char sectname[MACH_O_NAMELEN]; /* Section name */
char segment[MACH_O_NAMELEN]; /* Segment of this section */
uint32_t addr; /* Address in memory */
uint32_t size; /* Section size */
uint32_t offset; /* File offset */
uint32_t align; /* Log2 of section alignment */
uint32_t reloff; /* File offset of relocations */
uint32_t nreloc; /* Number of relocs for this section */
uint32_t flags; /* Flags */
uint32_t reserved1;
uint32_t reserved2;
};
/* 64-bit section header within a LC_SEGMENT_64 segment. */
struct macho_section_64
{
char sectname[MACH_O_NAMELEN]; /* Section name */
char segment[MACH_O_NAMELEN]; /* Segment of this section */
uint64_t addr; /* Address in memory */
uint64_t size; /* Section size */
uint32_t offset; /* File offset */
uint32_t align; /* Log2 of section alignment */
uint32_t reloff; /* File offset of section relocations */
uint32_t nreloc; /* Number of relocs for this section */
uint32_t flags; /* Flags */
uint32_t reserved1;
uint32_t reserved2;
uint32_t reserved3;
};
/* 32-bit symbol data. */
struct macho_nlist
{
uint32_t n_strx; /* Index of name in string table */
uint8_t n_type; /* Type flag */
uint8_t n_sect; /* Section number */
uint16_t n_desc; /* Stabs description field */
uint32_t n_value; /* Value */
};
/* 64-bit symbol data. */
struct macho_nlist_64
{
uint32_t n_strx; /* Index of name in string table */
uint8_t n_type; /* Type flag */
uint8_t n_sect; /* Section number */
uint16_t n_desc; /* Stabs description field */
uint64_t n_value; /* Value */
};
/* Value found in nlist n_type field. */
#define MACH_O_N_STAB 0xe0 /* Stabs debugging symbol */
#define MACH_O_N_TYPE 0x0e /* Mask for type bits */
/* Values found after masking with MACH_O_N_TYPE. */
#define MACH_O_N_UNDF 0x00 /* Undefined symbol */
#define MACH_O_N_ABS 0x02 /* Absolute symbol */
#define MACH_O_N_SECT 0x0e /* Defined in section from n_sect field */
/* Information we keep for a Mach-O symbol. */
struct macho_symbol
{
const char *name; /* Symbol name */
uintptr_t address; /* Symbol address */
};
/* Information to pass to macho_syminfo. */
struct macho_syminfo_data
{
struct macho_syminfo_data *next; /* Next module */
struct macho_symbol *symbols; /* Symbols sorted by address */
size_t count; /* Number of symbols */
};
/* Names of sections, indexed by enum dwarf_section in internal.h. */
static const char * const dwarf_section_names[DEBUG_MAX] =
{
"__debug_info",
"__debug_line",
"__debug_abbrev",
"__debug_ranges",
"__debug_str",
"", /* DEBUG_ADDR */
"__debug_str_offs",
"", /* DEBUG_LINE_STR */
"__debug_rnglists"
};
/* Forward declaration. */
static int macho_add (struct backtrace_state *, const char *, int, off_t,
const unsigned char *, struct libbacktrace_base_address,
int, backtrace_error_callback, void *, fileline *,
int *);
/* A dummy callback function used when we can't find any debug info. */
static int
macho_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED,
uintptr_t pc ATTRIBUTE_UNUSED,
backtrace_full_callback callback ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback, void *data)
{
error_callback (data, "no debug info in Mach-O executable (make sure to compile with -g; may need to run dsymutil)", -1);
return 0;
}
/* A dummy callback function used when we can't find a symbol
table. */
static void
macho_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED,
uintptr_t addr ATTRIBUTE_UNUSED,
backtrace_syminfo_callback callback ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback, void *data)
{
error_callback (data, "no symbol table in Mach-O executable", -1);
}
/* Add a single DWARF section to DWARF_SECTIONS, if we need the
section. Returns 1 on success, 0 on failure. */
static int
macho_add_dwarf_section (struct backtrace_state *state, int descriptor,
const char *sectname, uint32_t offset, uint64_t size,
backtrace_error_callback error_callback, void *data,
struct dwarf_sections *dwarf_sections)
{
int i;
for (i = 0; i < (int) DEBUG_MAX; ++i)
{
if (dwarf_section_names[i][0] != '\0'
&& strncmp (sectname, dwarf_section_names[i], MACH_O_NAMELEN) == 0)
{
struct backtrace_view section_view;
/* FIXME: Perhaps it would be better to try to use a single
view to read all the DWARF data, as we try to do for
ELF. */
if (!backtrace_get_view (state, descriptor, offset, size,
error_callback, data, §ion_view))
return 0;
dwarf_sections->data[i] = (const unsigned char *) section_view.data;
dwarf_sections->size[i] = size;
break;
}
}
return 1;
}
/* Collect DWARF sections from a DWARF segment. Returns 1 on success,
0 on failure. */
static int
macho_add_dwarf_segment (struct backtrace_state *state, int descriptor,
off_t offset, unsigned int cmd, const char *psecs,
size_t sizesecs, unsigned int nsects,
backtrace_error_callback error_callback, void *data,
struct dwarf_sections *dwarf_sections)
{
size_t sec_header_size;
size_t secoffset;
unsigned int i;
switch (cmd)
{
case MACH_O_LC_SEGMENT:
sec_header_size = sizeof (struct macho_section);
break;
case MACH_O_LC_SEGMENT_64:
sec_header_size = sizeof (struct macho_section_64);
break;
default:
abort ();
}
secoffset = 0;
for (i = 0; i < nsects; ++i)
{
if (secoffset + sec_header_size > sizesecs)
{
error_callback (data, "section overflow withing segment", 0);
return 0;
}
switch (cmd)
{
case MACH_O_LC_SEGMENT:
{
struct macho_section section;
memcpy (§ion, psecs + secoffset, sizeof section);
macho_add_dwarf_section (state, descriptor, section.sectname,
offset + section.offset, section.size,
error_callback, data, dwarf_sections);
}
break;
case MACH_O_LC_SEGMENT_64:
{
struct macho_section_64 section;
memcpy (§ion, psecs + secoffset, sizeof section);
macho_add_dwarf_section (state, descriptor, section.sectname,
offset + section.offset, section.size,
error_callback, data, dwarf_sections);
}
break;
default:
abort ();
}
secoffset += sec_header_size;
}
return 1;
}
/* Compare struct macho_symbol for qsort. */
static int
macho_symbol_compare (const void *v1, const void *v2)
{
const struct macho_symbol *m1 = (const struct macho_symbol *) v1;
const struct macho_symbol *m2 = (const struct macho_symbol *) v2;
if (m1->address < m2->address)
return -1;
else if (m1->address > m2->address)
return 1;
else
return 0;
}
/* Compare an address against a macho_symbol for bsearch. We allocate
one extra entry in the array so that this can safely look at the
next entry. */
static int
macho_symbol_search (const void *vkey, const void *ventry)
{
const uintptr_t *key = (const uintptr_t *) vkey;
const struct macho_symbol *entry = (const struct macho_symbol *) ventry;
uintptr_t addr;
addr = *key;
if (addr < entry->address)
return -1;
else if (entry->name[0] == '\0'
&& entry->address == ~(uintptr_t) 0)
return -1;
else if ((entry + 1)->name[0] == '\0'
&& (entry + 1)->address == ~(uintptr_t) 0)
return -1;
else if (addr >= (entry + 1)->address)
return 1;
else
return 0;
}
/* Return whether the symbol type field indicates a symbol table entry
that we care about: a function or data symbol. */
static int
macho_defined_symbol (uint8_t type)
{
if ((type & MACH_O_N_STAB) != 0)
return 0;
switch (type & MACH_O_N_TYPE)
{
case MACH_O_N_UNDF:
return 0;
case MACH_O_N_ABS:
return 1;
case MACH_O_N_SECT:
return 1;
default:
return 0;
}
}
/* Add symbol table information for a Mach-O file. */
static int
macho_add_symtab (struct backtrace_state *state, int descriptor,
struct libbacktrace_base_address base_address, int is_64,
off_t symoff, unsigned int nsyms, off_t stroff,
unsigned int strsize,
backtrace_error_callback error_callback, void *data)
{
size_t symsize;
struct backtrace_view sym_view;
int sym_view_valid;
struct backtrace_view str_view;
int str_view_valid;
size_t ndefs;
size_t symtaboff;
unsigned int i;
size_t macho_symbol_size;
struct macho_symbol *macho_symbols;
unsigned int j;
struct macho_syminfo_data *sdata;
sym_view_valid = 0;
str_view_valid = 0;
macho_symbol_size = 0;
macho_symbols = NULL;
if (is_64)
symsize = sizeof (struct macho_nlist_64);
else
symsize = sizeof (struct macho_nlist);
if (!backtrace_get_view (state, descriptor, symoff, nsyms * symsize,
error_callback, data, &sym_view))
goto fail;
sym_view_valid = 1;
if (!backtrace_get_view (state, descriptor, stroff, strsize,
error_callback, data, &str_view))
return 0;
str_view_valid = 1;
ndefs = 0;
symtaboff = 0;
for (i = 0; i < nsyms; ++i, symtaboff += symsize)
{
if (is_64)
{
struct macho_nlist_64 nlist;
memcpy (&nlist, (const char *) sym_view.data + symtaboff,
sizeof nlist);
if (macho_defined_symbol (nlist.n_type))
++ndefs;
}
else
{
struct macho_nlist nlist;
memcpy (&nlist, (const char *) sym_view.data + symtaboff,
sizeof nlist);
if (macho_defined_symbol (nlist.n_type))
++ndefs;
}
}
/* Add 1 to ndefs to make room for a sentinel. */
macho_symbol_size = (ndefs + 1) * sizeof (struct macho_symbol);
macho_symbols = ((struct macho_symbol *)
backtrace_alloc (state, macho_symbol_size, error_callback,
data));
if (macho_symbols == NULL)
goto fail;
j = 0;
symtaboff = 0;
for (i = 0; i < nsyms; ++i, symtaboff += symsize)
{
uint32_t strx;
uint64_t value;
const char *name;
strx = 0;
value = 0;
if (is_64)
{
struct macho_nlist_64 nlist;
memcpy (&nlist, (const char *) sym_view.data + symtaboff,
sizeof nlist);
if (!macho_defined_symbol (nlist.n_type))
continue;
strx = nlist.n_strx;
value = nlist.n_value;
}
else
{
struct macho_nlist nlist;
memcpy (&nlist, (const char *) sym_view.data + symtaboff,
sizeof nlist);
if (!macho_defined_symbol (nlist.n_type))
continue;
strx = nlist.n_strx;
value = nlist.n_value;
}
if (strx >= strsize)
{
error_callback (data, "symbol string index out of range", 0);
goto fail;
}
name = (const char *) str_view.data + strx;
if (name[0] == '_')
++name;
macho_symbols[j].name = name;
macho_symbols[j].address = libbacktrace_add_base (value, base_address);
++j;
}
sdata = ((struct macho_syminfo_data *)
backtrace_alloc (state, sizeof *sdata, error_callback, data));
if (sdata == NULL)
goto fail;
/* We need to keep the string table since it holds the names, but we
can release the symbol table. */
backtrace_release_view (state, &sym_view, error_callback, data);
sym_view_valid = 0;
str_view_valid = 0;
/* Add a trailing sentinel symbol. */
macho_symbols[j].name = "";
macho_symbols[j].address = ~(uintptr_t) 0;
backtrace_qsort (macho_symbols, ndefs + 1, sizeof (struct macho_symbol),
macho_symbol_compare);
sdata->next = NULL;
sdata->symbols = macho_symbols;
sdata->count = ndefs;
if (!state->threaded)
{
struct macho_syminfo_data **pp;
for (pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data;
*pp != NULL;
pp = &(*pp)->next)
;
*pp = sdata;
}
else
{
while (1)
{
struct macho_syminfo_data **pp;
pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data;
while (1)
{
struct macho_syminfo_data *p;
p = backtrace_atomic_load_pointer (pp);
if (p == NULL)
break;
pp = &p->next;
}
if (__sync_bool_compare_and_swap (pp, NULL, sdata))
break;
}
}
return 1;
fail:
if (macho_symbols != NULL)
backtrace_free (state, macho_symbols, macho_symbol_size,
error_callback, data);
if (sym_view_valid)
backtrace_release_view (state, &sym_view, error_callback, data);
if (str_view_valid)
backtrace_release_view (state, &str_view, error_callback, data);
return 0;
}
/* Return the symbol name and value for an ADDR. */
static void
macho_syminfo (struct backtrace_state *state, uintptr_t addr,
backtrace_syminfo_callback callback,
backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
void *data)
{
struct macho_syminfo_data *sdata;
struct macho_symbol *sym;
sym = NULL;
if (!state->threaded)
{
for (sdata = (struct macho_syminfo_data *) state->syminfo_data;
sdata != NULL;
sdata = sdata->next)
{
sym = ((struct macho_symbol *)
bsearch (&addr, sdata->symbols, sdata->count,
sizeof (struct macho_symbol), macho_symbol_search));
if (sym != NULL)
break;
}
}
else
{
struct macho_syminfo_data **pp;
pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data;
while (1)
{
sdata = backtrace_atomic_load_pointer (pp);
if (sdata == NULL)
break;
sym = ((struct macho_symbol *)
bsearch (&addr, sdata->symbols, sdata->count,
sizeof (struct macho_symbol), macho_symbol_search));
if (sym != NULL)
break;
pp = &sdata->next;
}
}
if (sym == NULL)
callback (data, addr, NULL, 0, 0);
else
callback (data, addr, sym->name, sym->address, 0);
}
/* Look through a fat file to find the relevant executable. Returns 1
on success, 0 on failure (in both cases descriptor is closed). */
static int
macho_add_fat (struct backtrace_state *state, const char *filename,
int descriptor, int swapped, off_t offset,
const unsigned char *match_uuid,
struct libbacktrace_base_address base_address,
int skip_symtab, uint32_t nfat_arch, int is_64,
backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym)
{
int arch_view_valid;
unsigned int cputype;
size_t arch_size;
struct backtrace_view arch_view;
unsigned int i;
arch_view_valid = 0;
#if defined (__x86_64__)
cputype = MACH_O_CPU_TYPE_X86_64;
#elif defined (__i386__)
cputype = MACH_O_CPU_TYPE_X86;
#elif defined (__aarch64__)
cputype = MACH_O_CPU_TYPE_ARM64;
#elif defined (__arm__)
cputype = MACH_O_CPU_TYPE_ARM;
#elif defined (__ppc__)
cputype = MACH_O_CPU_TYPE_PPC;
#elif defined (__ppc64__)
cputype = MACH_O_CPU_TYPE_PPC64;
#else
error_callback (data, "unknown Mach-O architecture", 0);
goto fail;
#endif
if (is_64)
arch_size = sizeof (struct macho_fat_arch_64);
else
arch_size = sizeof (struct macho_fat_arch);
if (!backtrace_get_view (state, descriptor, offset,
nfat_arch * arch_size,
error_callback, data, &arch_view))
goto fail;
for (i = 0; i < nfat_arch; ++i)
{
uint32_t fcputype;
uint64_t foffset;
if (is_64)
{
struct macho_fat_arch_64 fat_arch_64;
memcpy (&fat_arch_64,
(const char *) arch_view.data + i * arch_size,
arch_size);
fcputype = fat_arch_64.cputype;
foffset = fat_arch_64.offset;
if (swapped)
{
fcputype = __builtin_bswap32 (fcputype);
foffset = __builtin_bswap64 (foffset);
}
}
else
{
struct macho_fat_arch fat_arch_32;
memcpy (&fat_arch_32,
(const char *) arch_view.data + i * arch_size,
arch_size);
fcputype = fat_arch_32.cputype;
foffset = (uint64_t) fat_arch_32.offset;
if (swapped)
{
fcputype = __builtin_bswap32 (fcputype);
foffset = (uint64_t) __builtin_bswap32 ((uint32_t) foffset);
}
}
if (fcputype == cputype)
{
/* FIXME: What about cpusubtype? */
backtrace_release_view (state, &arch_view, error_callback, data);
return macho_add (state, filename, descriptor, foffset, match_uuid,
base_address, skip_symtab, error_callback, data,
fileline_fn, found_sym);
}
}
error_callback (data, "could not find executable in fat file", 0);
fail:
if (arch_view_valid)
backtrace_release_view (state, &arch_view, error_callback, data);
if (descriptor != -1)
backtrace_close (descriptor, error_callback, data);
return 0;
}
/* Look for the dsym file for FILENAME. This is called if FILENAME
does not have debug info or a symbol table. Returns 1 on success,
0 on failure. */
static int
macho_add_dsym (struct backtrace_state *state, const char *filename,
struct libbacktrace_base_address base_address,
const unsigned char *uuid,
backtrace_error_callback error_callback, void *data,
fileline* fileline_fn)
{
const char *p;
const char *dirname;
char *diralc;
size_t dirnamelen;
const char *basename;
size_t basenamelen;
const char *dsymsuffixdir;
size_t dsymsuffixdirlen;
size_t dsymlen;
char *dsym;
char *ps;
int d;
int does_not_exist;
int dummy_found_sym;
diralc = NULL;
dirnamelen = 0;
dsym = NULL;
dsymlen = 0;
p = strrchr (filename, '/');
if (p == NULL)
{
dirname = ".";
dirnamelen = 1;
basename = filename;
basenamelen = strlen (basename);
diralc = NULL;
}
else
{
dirnamelen = p - filename;
diralc = backtrace_alloc (state, dirnamelen + 1, error_callback, data);
if (diralc == NULL)
goto fail;
memcpy (diralc, filename, dirnamelen);
diralc[dirnamelen] = '\0';
dirname = diralc;
basename = p + 1;
basenamelen = strlen (basename);
}
dsymsuffixdir = ".dSYM/Contents/Resources/DWARF/";
dsymsuffixdirlen = strlen (dsymsuffixdir);
dsymlen = (dirnamelen
+ 1
+ basenamelen
+ dsymsuffixdirlen
+ basenamelen
+ 1);
dsym = backtrace_alloc (state, dsymlen, error_callback, data);
if (dsym == NULL)
goto fail;
ps = dsym;
memcpy (ps, dirname, dirnamelen);
ps += dirnamelen;
*ps++ = '/';
memcpy (ps, basename, basenamelen);
ps += basenamelen;
memcpy (ps, dsymsuffixdir, dsymsuffixdirlen);
ps += dsymsuffixdirlen;
memcpy (ps, basename, basenamelen);
ps += basenamelen;
*ps = '\0';
if (diralc != NULL)
{
backtrace_free (state, diralc, dirnamelen + 1, error_callback, data);
diralc = NULL;
}
d = backtrace_open (dsym, error_callback, data, &does_not_exist);
if (d < 0)
{
/* The file does not exist, so we can't read the debug info.
Just return success. */
backtrace_free (state, dsym, dsymlen, error_callback, data);
return 1;
}
if (!macho_add (state, dsym, d, 0, uuid, base_address, 1,
error_callback, data, fileline_fn, &dummy_found_sym))
goto fail;
backtrace_free (state, dsym, dsymlen, error_callback, data);
return 1;
fail:
if (dsym != NULL)
backtrace_free (state, dsym, dsymlen, error_callback, data);
if (diralc != NULL)
backtrace_free (state, diralc, dirnamelen, error_callback, data);
return 0;
}
/* Add the backtrace data for a Macho-O file. Returns 1 on success, 0
on failure (in both cases descriptor is closed).
FILENAME: the name of the executable.
DESCRIPTOR: an open descriptor for the executable, closed here.
OFFSET: the offset within the file of this executable, for fat files.
MATCH_UUID: if not NULL, UUID that must match.
BASE_ADDRESS: the load address of the executable.
SKIP_SYMTAB: if non-zero, ignore the symbol table; used for dSYM files.
FILELINE_FN: set to the fileline function, by backtrace_dwarf_add.
FOUND_SYM: set to non-zero if we found the symbol table.
*/
static int
macho_add (struct backtrace_state *state, const char *filename, int descriptor,
off_t offset, const unsigned char *match_uuid,
struct libbacktrace_base_address base_address, int skip_symtab,
backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym)
{
struct backtrace_view header_view;
struct macho_header_32 header;
off_t hdroffset;
int is_64;
struct backtrace_view cmds_view;
int cmds_view_valid;
struct dwarf_sections dwarf_sections;
int have_dwarf;
unsigned char uuid[MACH_O_UUID_LEN];
int have_uuid;
size_t cmdoffset;