]>
Commit | Line | Data |
---|---|---|
dea40c94 | 1 | /* elf.c -- Get debug data from a Mach-O file for backtraces. |
99dee823 | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
dea40c94 ILT |
3 | Written by Ian Lance Taylor, Google. |
4 | ||
5 | Redistribution and use in source and binary forms, with or without | |
6 | modification, are permitted provided that the following conditions are | |
7 | met: | |
8 | ||
9 | (1) Redistributions of source code must retain the above copyright | |
10 | notice, this list of conditions and the following disclaimer. | |
11 | ||
12 | (2) Redistributions in binary form must reproduce the above copyright | |
13 | notice, this list of conditions and the following disclaimer in | |
14 | the documentation and/or other materials provided with the | |
15 | distribution. | |
16 | ||
17 | (3) The name of the author may not be used to | |
18 | endorse or promote products derived from this software without | |
19 | specific prior written permission. | |
20 | ||
21 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
23 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
25 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
26 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
27 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
29 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
30 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | POSSIBILITY OF SUCH DAMAGE. */ | |
32 | ||
33 | #include "config.h" | |
34 | ||
35 | #include <sys/types.h> | |
36 | #include <dirent.h> | |
37 | #include <stdlib.h> | |
38 | #include <string.h> | |
39 | ||
40 | #ifdef HAVE_MACH_O_DYLD_H | |
41 | #include <mach-o/dyld.h> | |
42 | #endif | |
43 | ||
44 | #include "backtrace.h" | |
45 | #include "internal.h" | |
46 | ||
47 | /* Mach-O file header for a 32-bit executable. */ | |
48 | ||
49 | struct macho_header_32 | |
50 | { | |
51 | uint32_t magic; /* Magic number (MACH_O_MAGIC_32) */ | |
52 | uint32_t cputype; /* CPU type */ | |
53 | uint32_t cpusubtype; /* CPU subtype */ | |
54 | uint32_t filetype; /* Type of file (object, executable) */ | |
55 | uint32_t ncmds; /* Number of load commands */ | |
56 | uint32_t sizeofcmds; /* Total size of load commands */ | |
57 | uint32_t flags; /* Flags for special features */ | |
58 | }; | |
59 | ||
60 | /* Mach-O file header for a 64-bit executable. */ | |
61 | ||
62 | struct macho_header_64 | |
63 | { | |
64 | uint32_t magic; /* Magic number (MACH_O_MAGIC_64) */ | |
65 | uint32_t cputype; /* CPU type */ | |
66 | uint32_t cpusubtype; /* CPU subtype */ | |
67 | uint32_t filetype; /* Type of file (object, executable) */ | |
68 | uint32_t ncmds; /* Number of load commands */ | |
69 | uint32_t sizeofcmds; /* Total size of load commands */ | |
70 | uint32_t flags; /* Flags for special features */ | |
71 | uint32_t reserved; /* Reserved */ | |
72 | }; | |
73 | ||
74 | /* Mach-O file header for a fat executable. */ | |
75 | ||
76 | struct macho_header_fat | |
77 | { | |
74c176ca | 78 | uint32_t magic; /* Magic number (MACH_O_MH_(MAGIC|CIGAM)_FAT(_64)?) */ |
dea40c94 ILT |
79 | uint32_t nfat_arch; /* Number of components */ |
80 | }; | |
81 | ||
82 | /* Values for the header magic field. */ | |
83 | ||
84 | #define MACH_O_MH_MAGIC_32 0xfeedface | |
85 | #define MACH_O_MH_MAGIC_64 0xfeedfacf | |
86 | #define MACH_O_MH_MAGIC_FAT 0xcafebabe | |
87 | #define MACH_O_MH_CIGAM_FAT 0xbebafeca | |
74c176ca ILT |
88 | #define MACH_O_MH_MAGIC_FAT_64 0xcafebabf |
89 | #define MACH_O_MH_CIGAM_FAT_64 0xbfbafeca | |
dea40c94 ILT |
90 | |
91 | /* Value for the header filetype field. */ | |
92 | ||
93 | #define MACH_O_MH_EXECUTE 0x02 | |
94 | #define MACH_O_MH_DYLIB 0x06 | |
95 | #define MACH_O_MH_DSYM 0x0a | |
96 | ||
97 | /* A component of a fat file. A fat file starts with a | |
98 | macho_header_fat followed by nfat_arch instances of this | |
99 | struct. */ | |
100 | ||
101 | struct macho_fat_arch | |
102 | { | |
103 | uint32_t cputype; /* CPU type */ | |
104 | uint32_t cpusubtype; /* CPU subtype */ | |
105 | uint32_t offset; /* File offset of this entry */ | |
106 | uint32_t size; /* Size of this entry */ | |
107 | uint32_t align; /* Alignment of this entry */ | |
108 | }; | |
109 | ||
74c176ca ILT |
110 | /* A component of a 64-bit fat file. This is used if the magic field |
111 | is MAGIC_FAT_64. This is only used when some file size or file | |
112 | offset is too large to represent in the 32-bit format. */ | |
113 | ||
114 | struct macho_fat_arch_64 | |
115 | { | |
116 | uint32_t cputype; /* CPU type */ | |
117 | uint32_t cpusubtype; /* CPU subtype */ | |
118 | uint64_t offset; /* File offset of this entry */ | |
119 | uint64_t size; /* Size of this entry */ | |
120 | uint32_t align; /* Alignment of this entry */ | |
121 | uint32_t reserved; /* Reserved */ | |
122 | }; | |
123 | ||
dea40c94 ILT |
124 | /* Values for the fat_arch cputype field (and the header cputype |
125 | field). */ | |
126 | ||
127 | #define MACH_O_CPU_ARCH_ABI64 0x01000000 | |
128 | ||
129 | #define MACH_O_CPU_TYPE_X86 7 | |
130 | #define MACH_O_CPU_TYPE_ARM 12 | |
d1339b51 | 131 | #define MACH_O_CPU_TYPE_PPC 18 |
dea40c94 ILT |
132 | |
133 | #define MACH_O_CPU_TYPE_X86_64 (MACH_O_CPU_TYPE_X86 | MACH_O_CPU_ARCH_ABI64) | |
134 | #define MACH_O_CPU_TYPE_ARM64 (MACH_O_CPU_TYPE_ARM | MACH_O_CPU_ARCH_ABI64) | |
d1339b51 | 135 | #define MACH_O_CPU_TYPE_PPC64 (MACH_O_CPU_TYPE_PPC | MACH_O_CPU_ARCH_ABI64) |
dea40c94 ILT |
136 | |
137 | /* The header of a load command. */ | |
138 | ||
139 | struct macho_load_command | |
140 | { | |
141 | uint32_t cmd; /* The type of load command */ | |
142 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
143 | }; | |
144 | ||
145 | /* Values for the load_command cmd field. */ | |
146 | ||
147 | #define MACH_O_LC_SEGMENT 0x01 | |
148 | #define MACH_O_LC_SYMTAB 0x02 | |
149 | #define MACH_O_LC_SEGMENT_64 0x19 | |
150 | #define MACH_O_LC_UUID 0x1b | |
151 | ||
152 | /* The length of a section of segment name. */ | |
153 | ||
154 | #define MACH_O_NAMELEN (16) | |
155 | ||
156 | /* LC_SEGMENT load command. */ | |
157 | ||
158 | struct macho_segment_command | |
159 | { | |
160 | uint32_t cmd; /* The type of load command (LC_SEGMENT) */ | |
161 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
162 | char segname[MACH_O_NAMELEN]; /* Segment name */ | |
163 | uint32_t vmaddr; /* Virtual memory address */ | |
164 | uint32_t vmsize; /* Virtual memory size */ | |
165 | uint32_t fileoff; /* Offset of data to be mapped */ | |
166 | uint32_t filesize; /* Size of data in file */ | |
167 | uint32_t maxprot; /* Maximum permitted virtual protection */ | |
168 | uint32_t initprot; /* Initial virtual memory protection */ | |
169 | uint32_t nsects; /* Number of sections in this segment */ | |
170 | uint32_t flags; /* Flags */ | |
171 | }; | |
172 | ||
173 | /* LC_SEGMENT_64 load command. */ | |
174 | ||
175 | struct macho_segment_64_command | |
176 | { | |
177 | uint32_t cmd; /* The type of load command (LC_SEGMENT) */ | |
178 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
179 | char segname[MACH_O_NAMELEN]; /* Segment name */ | |
180 | uint64_t vmaddr; /* Virtual memory address */ | |
181 | uint64_t vmsize; /* Virtual memory size */ | |
182 | uint64_t fileoff; /* Offset of data to be mapped */ | |
183 | uint64_t filesize; /* Size of data in file */ | |
184 | uint32_t maxprot; /* Maximum permitted virtual protection */ | |
185 | uint32_t initprot; /* Initial virtual memory protection */ | |
186 | uint32_t nsects; /* Number of sections in this segment */ | |
187 | uint32_t flags; /* Flags */ | |
188 | }; | |
189 | ||
190 | /* LC_SYMTAB load command. */ | |
191 | ||
192 | struct macho_symtab_command | |
193 | { | |
194 | uint32_t cmd; /* The type of load command (LC_SEGMENT) */ | |
195 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
196 | uint32_t symoff; /* File offset of symbol table */ | |
197 | uint32_t nsyms; /* Number of symbols */ | |
198 | uint32_t stroff; /* File offset of string table */ | |
199 | uint32_t strsize; /* String table size */ | |
200 | }; | |
201 | ||
202 | /* The length of a Mach-O uuid. */ | |
203 | ||
204 | #define MACH_O_UUID_LEN (16) | |
205 | ||
206 | /* LC_UUID load command. */ | |
207 | ||
208 | struct macho_uuid_command | |
209 | { | |
210 | uint32_t cmd; /* Type of load command (LC_UUID) */ | |
211 | uint32_t cmdsize; /* Size in bytes of command */ | |
212 | unsigned char uuid[MACH_O_UUID_LEN]; /* UUID */ | |
213 | }; | |
214 | ||
215 | /* 32-bit section header within a LC_SEGMENT segment. */ | |
216 | ||
217 | struct macho_section | |
218 | { | |
219 | char sectname[MACH_O_NAMELEN]; /* Section name */ | |
220 | char segment[MACH_O_NAMELEN]; /* Segment of this section */ | |
221 | uint32_t addr; /* Address in memory */ | |
222 | uint32_t size; /* Section size */ | |
223 | uint32_t offset; /* File offset */ | |
224 | uint32_t align; /* Log2 of section alignment */ | |
225 | uint32_t reloff; /* File offset of relocations */ | |
226 | uint32_t nreloc; /* Number of relocs for this section */ | |
227 | uint32_t flags; /* Flags */ | |
228 | uint32_t reserved1; | |
229 | uint32_t reserved2; | |
230 | }; | |
231 | ||
232 | /* 64-bit section header within a LC_SEGMENT_64 segment. */ | |
233 | ||
234 | struct macho_section_64 | |
235 | { | |
236 | char sectname[MACH_O_NAMELEN]; /* Section name */ | |
237 | char segment[MACH_O_NAMELEN]; /* Segment of this section */ | |
238 | uint64_t addr; /* Address in memory */ | |
239 | uint64_t size; /* Section size */ | |
240 | uint32_t offset; /* File offset */ | |
241 | uint32_t align; /* Log2 of section alignment */ | |
242 | uint32_t reloff; /* File offset of section relocations */ | |
243 | uint32_t nreloc; /* Number of relocs for this section */ | |
244 | uint32_t flags; /* Flags */ | |
245 | uint32_t reserved1; | |
246 | uint32_t reserved2; | |
247 | uint32_t reserved3; | |
248 | }; | |
249 | ||
250 | /* 32-bit symbol data. */ | |
251 | ||
252 | struct macho_nlist | |
253 | { | |
254 | uint32_t n_strx; /* Index of name in string table */ | |
255 | uint8_t n_type; /* Type flag */ | |
256 | uint8_t n_sect; /* Section number */ | |
257 | uint16_t n_desc; /* Stabs description field */ | |
258 | uint32_t n_value; /* Value */ | |
259 | }; | |
260 | ||
261 | /* 64-bit symbol data. */ | |
262 | ||
263 | struct macho_nlist_64 | |
264 | { | |
265 | uint32_t n_strx; /* Index of name in string table */ | |
266 | uint8_t n_type; /* Type flag */ | |
267 | uint8_t n_sect; /* Section number */ | |
268 | uint16_t n_desc; /* Stabs description field */ | |
269 | uint64_t n_value; /* Value */ | |
270 | }; | |
271 | ||
272 | /* Value found in nlist n_type field. */ | |
273 | ||
274 | #define MACH_O_N_EXT 0x01 /* Extern symbol */ | |
275 | #define MACH_O_N_ABS 0x02 /* Absolute symbol */ | |
276 | #define MACH_O_N_SECT 0x0e /* Defined in section */ | |
277 | ||
278 | #define MACH_O_N_TYPE 0x0e /* Mask for type bits */ | |
279 | #define MACH_O_N_STAB 0xe0 /* Stabs debugging symbol */ | |
280 | ||
281 | /* Information we keep for a Mach-O symbol. */ | |
282 | ||
283 | struct macho_symbol | |
284 | { | |
285 | const char *name; /* Symbol name */ | |
286 | uintptr_t address; /* Symbol address */ | |
287 | }; | |
288 | ||
289 | /* Information to pass to macho_syminfo. */ | |
290 | ||
291 | struct macho_syminfo_data | |
292 | { | |
293 | struct macho_syminfo_data *next; /* Next module */ | |
294 | struct macho_symbol *symbols; /* Symbols sorted by address */ | |
295 | size_t count; /* Number of symbols */ | |
296 | }; | |
297 | ||
298 | /* Names of sections, indexed by enum dwarf_section in internal.h. */ | |
299 | ||
300 | static const char * const dwarf_section_names[DEBUG_MAX] = | |
301 | { | |
302 | "__debug_info", | |
303 | "__debug_line", | |
304 | "__debug_abbrev", | |
305 | "__debug_ranges", | |
306 | "__debug_str", | |
307 | "", /* DEBUG_ADDR */ | |
308 | "__debug_str_offs", | |
309 | "", /* DEBUG_LINE_STR */ | |
310 | "__debug_rnglists" | |
311 | }; | |
312 | ||
313 | /* Forward declaration. */ | |
314 | ||
315 | static int macho_add (struct backtrace_state *, const char *, int, off_t, | |
316 | const unsigned char *, uintptr_t, int, | |
317 | backtrace_error_callback, void *, fileline *, int *); | |
318 | ||
319 | /* A dummy callback function used when we can't find any debug info. */ | |
320 | ||
321 | static int | |
322 | macho_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED, | |
323 | uintptr_t pc ATTRIBUTE_UNUSED, | |
324 | backtrace_full_callback callback ATTRIBUTE_UNUSED, | |
325 | backtrace_error_callback error_callback, void *data) | |
326 | { | |
327 | error_callback (data, "no debug info in Mach-O executable", -1); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | /* A dummy callback function used when we can't find a symbol | |
332 | table. */ | |
333 | ||
334 | static void | |
335 | macho_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED, | |
336 | uintptr_t addr ATTRIBUTE_UNUSED, | |
337 | backtrace_syminfo_callback callback ATTRIBUTE_UNUSED, | |
338 | backtrace_error_callback error_callback, void *data) | |
339 | { | |
340 | error_callback (data, "no symbol table in Mach-O executable", -1); | |
341 | } | |
342 | ||
343 | /* Add a single DWARF section to DWARF_SECTIONS, if we need the | |
344 | section. Returns 1 on success, 0 on failure. */ | |
345 | ||
346 | static int | |
347 | macho_add_dwarf_section (struct backtrace_state *state, int descriptor, | |
348 | const char *sectname, uint32_t offset, uint64_t size, | |
349 | backtrace_error_callback error_callback, void *data, | |
350 | struct dwarf_sections *dwarf_sections) | |
351 | { | |
352 | int i; | |
353 | ||
354 | for (i = 0; i < (int) DEBUG_MAX; ++i) | |
355 | { | |
356 | if (dwarf_section_names[i][0] != '\0' | |
357 | && strncmp (sectname, dwarf_section_names[i], MACH_O_NAMELEN) == 0) | |
358 | { | |
359 | struct backtrace_view section_view; | |
360 | ||
361 | /* FIXME: Perhaps it would be better to try to use a single | |
362 | view to read all the DWARF data, as we try to do for | |
363 | ELF. */ | |
364 | ||
365 | if (!backtrace_get_view (state, descriptor, offset, size, | |
366 | error_callback, data, §ion_view)) | |
367 | return 0; | |
368 | dwarf_sections->data[i] = (const unsigned char *) section_view.data; | |
369 | dwarf_sections->size[i] = size; | |
370 | break; | |
371 | } | |
372 | } | |
373 | return 1; | |
374 | } | |
375 | ||
376 | /* Collect DWARF sections from a DWARF segment. Returns 1 on success, | |
377 | 0 on failure. */ | |
378 | ||
379 | static int | |
380 | macho_add_dwarf_segment (struct backtrace_state *state, int descriptor, | |
381 | off_t offset, unsigned int cmd, const char *psecs, | |
382 | size_t sizesecs, unsigned int nsects, | |
383 | backtrace_error_callback error_callback, void *data, | |
384 | struct dwarf_sections *dwarf_sections) | |
385 | { | |
386 | size_t sec_header_size; | |
387 | size_t secoffset; | |
388 | unsigned int i; | |
389 | ||
390 | switch (cmd) | |
391 | { | |
392 | case MACH_O_LC_SEGMENT: | |
393 | sec_header_size = sizeof (struct macho_section); | |
394 | break; | |
395 | case MACH_O_LC_SEGMENT_64: | |
396 | sec_header_size = sizeof (struct macho_section_64); | |
397 | break; | |
398 | default: | |
399 | abort (); | |
400 | } | |
401 | ||
402 | secoffset = 0; | |
403 | for (i = 0; i < nsects; ++i) | |
404 | { | |
405 | if (secoffset + sec_header_size > sizesecs) | |
406 | { | |
407 | error_callback (data, "section overflow withing segment", 0); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | switch (cmd) | |
412 | { | |
413 | case MACH_O_LC_SEGMENT: | |
414 | { | |
415 | struct macho_section section; | |
416 | ||
417 | memcpy (§ion, psecs + secoffset, sizeof section); | |
418 | macho_add_dwarf_section (state, descriptor, section.sectname, | |
419 | offset + section.offset, section.size, | |
420 | error_callback, data, dwarf_sections); | |
421 | } | |
422 | break; | |
423 | ||
424 | case MACH_O_LC_SEGMENT_64: | |
425 | { | |
426 | struct macho_section_64 section; | |
427 | ||
428 | memcpy (§ion, psecs + secoffset, sizeof section); | |
429 | macho_add_dwarf_section (state, descriptor, section.sectname, | |
430 | offset + section.offset, section.size, | |
431 | error_callback, data, dwarf_sections); | |
432 | } | |
433 | break; | |
434 | ||
435 | default: | |
436 | abort (); | |
437 | } | |
438 | ||
439 | secoffset += sec_header_size; | |
440 | } | |
441 | ||
442 | return 1; | |
443 | } | |
444 | ||
445 | /* Compare struct macho_symbol for qsort. */ | |
446 | ||
447 | static int | |
448 | macho_symbol_compare (const void *v1, const void *v2) | |
449 | { | |
450 | const struct macho_symbol *m1 = (const struct macho_symbol *) v1; | |
451 | const struct macho_symbol *m2 = (const struct macho_symbol *) v2; | |
452 | ||
453 | if (m1->address < m2->address) | |
454 | return -1; | |
455 | else if (m1->address > m2->address) | |
456 | return 1; | |
457 | else | |
458 | return 0; | |
459 | } | |
460 | ||
461 | /* Compare an address against a macho_symbol for bsearch. We allocate | |
462 | one extra entry in the array so that this can safely look at the | |
463 | next entry. */ | |
464 | ||
465 | static int | |
466 | macho_symbol_search (const void *vkey, const void *ventry) | |
467 | { | |
468 | const uintptr_t *key = (const uintptr_t *) vkey; | |
469 | const struct macho_symbol *entry = (const struct macho_symbol *) ventry; | |
470 | uintptr_t addr; | |
471 | ||
472 | addr = *key; | |
473 | if (addr < entry->address) | |
474 | return -1; | |
475 | else if (entry->name[0] == '\0' | |
476 | && entry->address == ~(uintptr_t) 0) | |
477 | return -1; | |
478 | else if ((entry + 1)->name[0] == '\0' | |
479 | && (entry + 1)->address == ~(uintptr_t) 0) | |
480 | return -1; | |
481 | else if (addr >= (entry + 1)->address) | |
482 | return 1; | |
483 | else | |
484 | return 0; | |
485 | } | |
486 | ||
487 | /* Return whether the symbol type field indicates a symbol table entry | |
488 | that we care about: a function or data symbol. */ | |
489 | ||
490 | static int | |
491 | macho_defined_symbol (uint8_t type) | |
492 | { | |
493 | if ((type & MACH_O_N_STAB) != 0) | |
494 | return 0; | |
495 | if ((type & MACH_O_N_EXT) != 0) | |
496 | return 0; | |
497 | switch (type & MACH_O_N_TYPE) | |
498 | { | |
499 | case MACH_O_N_ABS: | |
500 | return 1; | |
501 | case MACH_O_N_SECT: | |
502 | return 1; | |
503 | default: | |
504 | return 0; | |
505 | } | |
506 | } | |
507 | ||
508 | /* Add symbol table information for a Mach-O file. */ | |
509 | ||
510 | static int | |
511 | macho_add_symtab (struct backtrace_state *state, int descriptor, | |
512 | uintptr_t base_address, int is_64, | |
513 | off_t symoff, unsigned int nsyms, off_t stroff, | |
514 | unsigned int strsize, | |
515 | backtrace_error_callback error_callback, void *data) | |
516 | { | |
517 | size_t symsize; | |
518 | struct backtrace_view sym_view; | |
519 | int sym_view_valid; | |
520 | struct backtrace_view str_view; | |
521 | int str_view_valid; | |
522 | size_t ndefs; | |
523 | size_t symtaboff; | |
524 | unsigned int i; | |
525 | size_t macho_symbol_size; | |
526 | struct macho_symbol *macho_symbols; | |
527 | unsigned int j; | |
528 | struct macho_syminfo_data *sdata; | |
529 | ||
530 | sym_view_valid = 0; | |
531 | str_view_valid = 0; | |
532 | macho_symbol_size = 0; | |
533 | macho_symbols = NULL; | |
534 | ||
535 | if (is_64) | |
536 | symsize = sizeof (struct macho_nlist_64); | |
537 | else | |
538 | symsize = sizeof (struct macho_nlist); | |
539 | ||
540 | if (!backtrace_get_view (state, descriptor, symoff, nsyms * symsize, | |
541 | error_callback, data, &sym_view)) | |
542 | goto fail; | |
543 | sym_view_valid = 1; | |
544 | ||
545 | if (!backtrace_get_view (state, descriptor, stroff, strsize, | |
546 | error_callback, data, &str_view)) | |
547 | return 0; | |
548 | str_view_valid = 1; | |
549 | ||
550 | ndefs = 0; | |
551 | symtaboff = 0; | |
552 | for (i = 0; i < nsyms; ++i, symtaboff += symsize) | |
553 | { | |
554 | if (is_64) | |
555 | { | |
556 | struct macho_nlist_64 nlist; | |
557 | ||
558 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
559 | sizeof nlist); | |
560 | if (macho_defined_symbol (nlist.n_type)) | |
561 | ++ndefs; | |
562 | } | |
563 | else | |
564 | { | |
565 | struct macho_nlist nlist; | |
566 | ||
567 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
568 | sizeof nlist); | |
569 | if (macho_defined_symbol (nlist.n_type)) | |
570 | ++ndefs; | |
571 | } | |
572 | } | |
573 | ||
574 | /* Add 1 to ndefs to make room for a sentinel. */ | |
575 | macho_symbol_size = (ndefs + 1) * sizeof (struct macho_symbol); | |
576 | macho_symbols = ((struct macho_symbol *) | |
577 | backtrace_alloc (state, macho_symbol_size, error_callback, | |
578 | data)); | |
579 | if (macho_symbols == NULL) | |
580 | goto fail; | |
581 | ||
582 | j = 0; | |
583 | symtaboff = 0; | |
584 | for (i = 0; i < nsyms; ++i, symtaboff += symsize) | |
585 | { | |
586 | uint32_t strx; | |
587 | uint64_t value; | |
588 | const char *name; | |
589 | ||
590 | strx = 0; | |
591 | value = 0; | |
592 | if (is_64) | |
593 | { | |
594 | struct macho_nlist_64 nlist; | |
595 | ||
596 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
597 | sizeof nlist); | |
598 | if (!macho_defined_symbol (nlist.n_type)) | |
599 | continue; | |
600 | ||
601 | strx = nlist.n_strx; | |
602 | value = nlist.n_value; | |
603 | } | |
604 | else | |
605 | { | |
606 | struct macho_nlist nlist; | |
607 | ||
608 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
609 | sizeof nlist); | |
610 | if (!macho_defined_symbol (nlist.n_type)) | |
611 | continue; | |
612 | ||
613 | strx = nlist.n_strx; | |
614 | value = nlist.n_value; | |
615 | } | |
616 | ||
617 | if (strx >= strsize) | |
618 | { | |
619 | error_callback (data, "symbol string index out of range", 0); | |
620 | goto fail; | |
621 | } | |
622 | ||
623 | name = (const char *) str_view.data + strx; | |
624 | if (name[0] == '_') | |
625 | ++name; | |
626 | macho_symbols[j].name = name; | |
627 | macho_symbols[j].address = value + base_address; | |
628 | ++j; | |
629 | } | |
630 | ||
631 | sdata = ((struct macho_syminfo_data *) | |
632 | backtrace_alloc (state, sizeof *sdata, error_callback, data)); | |
633 | if (sdata == NULL) | |
634 | goto fail; | |
635 | ||
636 | /* We need to keep the string table since it holds the names, but we | |
637 | can release the symbol table. */ | |
638 | ||
639 | backtrace_release_view (state, &sym_view, error_callback, data); | |
640 | sym_view_valid = 0; | |
641 | str_view_valid = 0; | |
642 | ||
643 | /* Add a trailing sentinel symbol. */ | |
644 | macho_symbols[j].name = ""; | |
645 | macho_symbols[j].address = ~(uintptr_t) 0; | |
646 | ||
647 | backtrace_qsort (macho_symbols, ndefs + 1, sizeof (struct macho_symbol), | |
648 | macho_symbol_compare); | |
649 | ||
650 | sdata->next = NULL; | |
651 | sdata->symbols = macho_symbols; | |
652 | sdata->count = ndefs; | |
653 | ||
654 | if (!state->threaded) | |
655 | { | |
656 | struct macho_syminfo_data **pp; | |
657 | ||
658 | for (pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data; | |
659 | *pp != NULL; | |
660 | pp = &(*pp)->next) | |
661 | ; | |
662 | *pp = sdata; | |
663 | } | |
664 | else | |
665 | { | |
666 | while (1) | |
667 | { | |
668 | struct macho_syminfo_data **pp; | |
669 | ||
670 | pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data; | |
671 | ||
672 | while (1) | |
673 | { | |
674 | struct macho_syminfo_data *p; | |
675 | ||
676 | p = backtrace_atomic_load_pointer (pp); | |
677 | ||
678 | if (p == NULL) | |
679 | break; | |
680 | ||
681 | pp = &p->next; | |
682 | } | |
683 | ||
684 | if (__sync_bool_compare_and_swap (pp, NULL, sdata)) | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | return 1; | |
690 | ||
691 | fail: | |
692 | if (macho_symbols != NULL) | |
693 | backtrace_free (state, macho_symbols, macho_symbol_size, | |
694 | error_callback, data); | |
695 | if (sym_view_valid) | |
696 | backtrace_release_view (state, &sym_view, error_callback, data); | |
697 | if (str_view_valid) | |
698 | backtrace_release_view (state, &str_view, error_callback, data); | |
699 | return 0; | |
700 | } | |
701 | ||
702 | /* Return the symbol name and value for an ADDR. */ | |
703 | ||
704 | static void | |
705 | macho_syminfo (struct backtrace_state *state, uintptr_t addr, | |
706 | backtrace_syminfo_callback callback, | |
707 | backtrace_error_callback error_callback ATTRIBUTE_UNUSED, | |
708 | void *data) | |
709 | { | |
710 | struct macho_syminfo_data *sdata; | |
711 | struct macho_symbol *sym; | |
712 | ||
713 | sym = NULL; | |
714 | if (!state->threaded) | |
715 | { | |
716 | for (sdata = (struct macho_syminfo_data *) state->syminfo_data; | |
717 | sdata != NULL; | |
718 | sdata = sdata->next) | |
719 | { | |
720 | sym = ((struct macho_symbol *) | |
721 | bsearch (&addr, sdata->symbols, sdata->count, | |
722 | sizeof (struct macho_symbol), macho_symbol_search)); | |
723 | if (sym != NULL) | |
724 | break; | |
725 | } | |
726 | } | |
727 | else | |
728 | { | |
729 | struct macho_syminfo_data **pp; | |
730 | ||
731 | pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data; | |
732 | while (1) | |
733 | { | |
734 | sdata = backtrace_atomic_load_pointer (pp); | |
735 | if (sdata == NULL) | |
736 | break; | |
737 | ||
738 | sym = ((struct macho_symbol *) | |
739 | bsearch (&addr, sdata->symbols, sdata->count, | |
740 | sizeof (struct macho_symbol), macho_symbol_search)); | |
741 | if (sym != NULL) | |
742 | break; | |
743 | ||
744 | pp = &sdata->next; | |
745 | } | |
746 | } | |
747 | ||
748 | if (sym == NULL) | |
749 | callback (data, addr, NULL, 0, 0); | |
750 | else | |
751 | callback (data, addr, sym->name, sym->address, 0); | |
752 | } | |
753 | ||
754 | /* Look through a fat file to find the relevant executable. Returns 1 | |
755 | on success, 0 on failure (in both cases descriptor is closed). */ | |
756 | ||
757 | static int | |
758 | macho_add_fat (struct backtrace_state *state, const char *filename, | |
759 | int descriptor, int swapped, off_t offset, | |
760 | const unsigned char *match_uuid, uintptr_t base_address, | |
74c176ca | 761 | int skip_symtab, uint32_t nfat_arch, int is_64, |
dea40c94 ILT |
762 | backtrace_error_callback error_callback, void *data, |
763 | fileline *fileline_fn, int *found_sym) | |
764 | { | |
765 | int arch_view_valid; | |
766 | unsigned int cputype; | |
74c176ca | 767 | size_t arch_size; |
dea40c94 | 768 | struct backtrace_view arch_view; |
dea40c94 ILT |
769 | unsigned int i; |
770 | ||
771 | arch_view_valid = 0; | |
772 | ||
773 | #if defined (__x86_64__) | |
774 | cputype = MACH_O_CPU_TYPE_X86_64; | |
775 | #elif defined (__i386__) | |
776 | cputype = MACH_O_CPU_TYPE_X86; | |
777 | #elif defined (__aarch64__) | |
778 | cputype = MACH_O_CPU_TYPE_ARM64; | |
779 | #elif defined (__arm__) | |
780 | cputype = MACH_O_CPU_TYPE_ARM; | |
d1339b51 IS |
781 | #elif defined (__ppc__) |
782 | cputype = MACH_O_CPU_TYPE_PPC; | |
783 | #elif defined (__ppc64__) | |
784 | cputype = MACH_O_CPU_TYPE_PPC64; | |
dea40c94 ILT |
785 | #else |
786 | error_callback (data, "unknown Mach-O architecture", 0); | |
787 | goto fail; | |
788 | #endif | |
789 | ||
74c176ca ILT |
790 | if (is_64) |
791 | arch_size = sizeof (struct macho_fat_arch_64); | |
792 | else | |
793 | arch_size = sizeof (struct macho_fat_arch); | |
794 | ||
dea40c94 | 795 | if (!backtrace_get_view (state, descriptor, offset, |
74c176ca | 796 | nfat_arch * arch_size, |
dea40c94 ILT |
797 | error_callback, data, &arch_view)) |
798 | goto fail; | |
799 | ||
dea40c94 ILT |
800 | for (i = 0; i < nfat_arch; ++i) |
801 | { | |
dea40c94 | 802 | uint32_t fcputype; |
488e3333 | 803 | uint64_t foffset; |
dea40c94 | 804 | |
74c176ca | 805 | if (is_64) |
488e3333 ILT |
806 | { |
807 | struct macho_fat_arch_64 fat_arch_64; | |
808 | ||
809 | memcpy (&fat_arch_64, | |
810 | (const char *) arch_view.data + i * arch_size, | |
811 | arch_size); | |
812 | fcputype = fat_arch_64.cputype; | |
813 | foffset = fat_arch_64.offset; | |
814 | if (swapped) | |
815 | { | |
816 | fcputype = __builtin_bswap32 (fcputype); | |
817 | foffset = __builtin_bswap64 (foffset); | |
818 | } | |
819 | } | |
74c176ca ILT |
820 | else |
821 | { | |
822 | struct macho_fat_arch fat_arch_32; | |
823 | ||
824 | memcpy (&fat_arch_32, | |
825 | (const char *) arch_view.data + i * arch_size, | |
826 | arch_size); | |
488e3333 ILT |
827 | fcputype = fat_arch_32.cputype; |
828 | foffset = (uint64_t) fat_arch_32.offset; | |
829 | if (swapped) | |
830 | { | |
831 | fcputype = __builtin_bswap32 (fcputype); | |
832 | foffset = (uint64_t) __builtin_bswap32 ((uint32_t) foffset); | |
833 | } | |
74c176ca | 834 | } |
dea40c94 | 835 | |
dea40c94 ILT |
836 | if (fcputype == cputype) |
837 | { | |
dea40c94 | 838 | /* FIXME: What about cpusubtype? */ |
dea40c94 ILT |
839 | backtrace_release_view (state, &arch_view, error_callback, data); |
840 | return macho_add (state, filename, descriptor, foffset, match_uuid, | |
841 | base_address, skip_symtab, error_callback, data, | |
842 | fileline_fn, found_sym); | |
843 | } | |
dea40c94 ILT |
844 | } |
845 | ||
846 | error_callback (data, "could not find executable in fat file", 0); | |
847 | ||
848 | fail: | |
849 | if (arch_view_valid) | |
850 | backtrace_release_view (state, &arch_view, error_callback, data); | |
851 | if (descriptor != -1) | |
852 | backtrace_close (descriptor, error_callback, data); | |
853 | return 0; | |
854 | } | |
855 | ||
856 | /* Look for the dsym file for FILENAME. This is called if FILENAME | |
857 | does not have debug info or a symbol table. Returns 1 on success, | |
858 | 0 on failure. */ | |
859 | ||
860 | static int | |
861 | macho_add_dsym (struct backtrace_state *state, const char *filename, | |
862 | uintptr_t base_address, const unsigned char *uuid, | |
863 | backtrace_error_callback error_callback, void *data, | |
864 | fileline* fileline_fn) | |
865 | { | |
866 | const char *p; | |
867 | const char *dirname; | |
868 | char *diralc; | |
869 | size_t dirnamelen; | |
870 | const char *basename; | |
871 | size_t basenamelen; | |
872 | const char *dsymsuffixdir; | |
873 | size_t dsymsuffixdirlen; | |
874 | size_t dsymlen; | |
875 | char *dsym; | |
876 | char *ps; | |
877 | int d; | |
878 | int does_not_exist; | |
879 | int dummy_found_sym; | |
880 | ||
881 | diralc = NULL; | |
882 | dirnamelen = 0; | |
883 | dsym = NULL; | |
884 | dsymlen = 0; | |
885 | ||
886 | p = strrchr (filename, '/'); | |
887 | if (p == NULL) | |
888 | { | |
889 | dirname = "."; | |
890 | dirnamelen = 1; | |
891 | basename = filename; | |
892 | basenamelen = strlen (basename); | |
893 | diralc = NULL; | |
894 | } | |
895 | else | |
896 | { | |
897 | dirnamelen = p - filename; | |
898 | diralc = backtrace_alloc (state, dirnamelen + 1, error_callback, data); | |
899 | if (diralc == NULL) | |
900 | goto fail; | |
901 | memcpy (diralc, filename, dirnamelen); | |
902 | diralc[dirnamelen] = '\0'; | |
903 | dirname = diralc; | |
904 | basename = p + 1; | |
905 | basenamelen = strlen (basename); | |
906 | } | |
907 | ||
908 | dsymsuffixdir = ".dSYM/Contents/Resources/DWARF/"; | |
909 | dsymsuffixdirlen = strlen (dsymsuffixdir); | |
910 | ||
911 | dsymlen = (dirnamelen | |
a8a7a97b | 912 | + 1 |
dea40c94 ILT |
913 | + basenamelen |
914 | + dsymsuffixdirlen | |
915 | + basenamelen | |
916 | + 1); | |
917 | dsym = backtrace_alloc (state, dsymlen, error_callback, data); | |
918 | if (dsym == NULL) | |
919 | goto fail; | |
920 | ||
921 | ps = dsym; | |
922 | memcpy (ps, dirname, dirnamelen); | |
923 | ps += dirnamelen; | |
924 | *ps++ = '/'; | |
925 | memcpy (ps, basename, basenamelen); | |
926 | ps += basenamelen; | |
927 | memcpy (ps, dsymsuffixdir, dsymsuffixdirlen); | |
928 | ps += dsymsuffixdirlen; | |
929 | memcpy (ps, basename, basenamelen); | |
930 | ps += basenamelen; | |
931 | *ps = '\0'; | |
932 | ||
933 | if (diralc != NULL) | |
934 | { | |
a8a7a97b | 935 | backtrace_free (state, diralc, dirnamelen + 1, error_callback, data); |
dea40c94 ILT |
936 | diralc = NULL; |
937 | } | |
938 | ||
939 | d = backtrace_open (dsym, error_callback, data, &does_not_exist); | |
940 | if (d < 0) | |
941 | { | |
942 | /* The file does not exist, so we can't read the debug info. | |
943 | Just return success. */ | |
944 | backtrace_free (state, dsym, dsymlen, error_callback, data); | |
945 | return 1; | |
946 | } | |
947 | ||
948 | if (!macho_add (state, dsym, d, 0, uuid, base_address, 1, | |
949 | error_callback, data, fileline_fn, &dummy_found_sym)) | |
950 | goto fail; | |
951 | ||
952 | backtrace_free (state, dsym, dsymlen, error_callback, data); | |
953 | ||
954 | return 1; | |
955 | ||
956 | fail: | |
957 | if (dsym != NULL) | |
958 | backtrace_free (state, dsym, dsymlen, error_callback, data); | |
959 | if (diralc != NULL) | |
960 | backtrace_free (state, diralc, dirnamelen, error_callback, data); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | /* Add the backtrace data for a Macho-O file. Returns 1 on success, 0 | |
965 | on failure (in both cases descriptor is closed). | |
966 | ||
967 | FILENAME: the name of the executable. | |
968 | DESCRIPTOR: an open descriptor for the executable, closed here. | |
969 | OFFSET: the offset within the file of this executable, for fat files. | |
970 | MATCH_UUID: if not NULL, UUID that must match. | |
971 | BASE_ADDRESS: the load address of the executable. | |
972 | SKIP_SYMTAB: if non-zero, ignore the symbol table; used for dSYM files. | |
973 | FILELINE_FN: set to the fileline function, by backtrace_dwarf_add. | |
974 | FOUND_SYM: set to non-zero if we found the symbol table. | |
975 | */ | |
976 | ||
977 | static int | |
978 | macho_add (struct backtrace_state *state, const char *filename, int descriptor, | |
979 | off_t offset, const unsigned char *match_uuid, | |
980 | uintptr_t base_address, int skip_symtab, | |
981 | backtrace_error_callback error_callback, void *data, | |
982 | fileline *fileline_fn, int *found_sym) | |
983 | { | |
984 | struct backtrace_view header_view; | |
985 | struct macho_header_32 header; | |
986 | off_t hdroffset; | |
987 | int is_64; | |
988 | struct backtrace_view cmds_view; | |
989 | int cmds_view_valid; | |
990 | struct dwarf_sections dwarf_sections; | |
991 | int have_dwarf; | |
992 | unsigned char uuid[MACH_O_UUID_LEN]; | |
993 | int have_uuid; | |
994 | size_t cmdoffset; | |
995 | unsigned int i; | |
996 | ||
997 | *found_sym = 0; | |
998 | ||
999 | cmds_view_valid = 0; | |
1000 | ||
1001 | /* The 32-bit and 64-bit file headers start out the same, so we can | |
1002 | just always read the 32-bit version. A fat header is shorter but | |
1003 | it will always be followed by data, so it's OK to read extra. */ | |
1004 | ||
1005 | if (!backtrace_get_view (state, descriptor, offset, | |
1006 | sizeof (struct macho_header_32), | |
1007 | error_callback, data, &header_view)) | |
1008 | goto fail; | |
1009 | ||
1010 | memcpy (&header, header_view.data, sizeof header); | |
1011 | ||
1012 | backtrace_release_view (state, &header_view, error_callback, data); | |
1013 | ||
1014 | switch (header.magic) | |
1015 | { | |
1016 | case MACH_O_MH_MAGIC_32: | |
1017 | is_64 = 0; | |
1018 | hdroffset = offset + sizeof (struct macho_header_32); | |
1019 | break; | |
1020 | case MACH_O_MH_MAGIC_64: | |
1021 | is_64 = 1; | |
1022 | hdroffset = offset + sizeof (struct macho_header_64); | |
1023 | break; | |
1024 | case MACH_O_MH_MAGIC_FAT: | |
74c176ca | 1025 | case MACH_O_MH_MAGIC_FAT_64: |
dea40c94 ILT |
1026 | { |
1027 | struct macho_header_fat fat_header; | |
1028 | ||
1029 | hdroffset = offset + sizeof (struct macho_header_fat); | |
1030 | memcpy (&fat_header, &header, sizeof fat_header); | |
1031 | return macho_add_fat (state, filename, descriptor, 0, hdroffset, | |
1032 | match_uuid, base_address, skip_symtab, | |
74c176ca ILT |
1033 | fat_header.nfat_arch, |
1034 | header.magic == MACH_O_MH_MAGIC_FAT_64, | |
1035 | error_callback, data, fileline_fn, found_sym); | |
dea40c94 ILT |
1036 | } |
1037 | case MACH_O_MH_CIGAM_FAT: | |
74c176ca | 1038 | case MACH_O_MH_CIGAM_FAT_64: |
dea40c94 ILT |
1039 | { |
1040 | struct macho_header_fat fat_header; | |
1041 | uint32_t nfat_arch; | |
1042 | ||
1043 | hdroffset = offset + sizeof (struct macho_header_fat); | |
1044 | memcpy (&fat_header, &header, sizeof fat_header); | |
1045 | nfat_arch = __builtin_bswap32 (fat_header.nfat_arch); | |
1046 | return macho_add_fat (state, filename, descriptor, 1, hdroffset, | |
1047 | match_uuid, base_address, skip_symtab, | |
74c176ca ILT |
1048 | nfat_arch, |
1049 | header.magic == MACH_O_MH_CIGAM_FAT_64, | |
1050 | error_callback, data, fileline_fn, found_sym); | |
dea40c94 ILT |
1051 | } |
1052 | default: | |
1053 | error_callback (data, "executable file is not in Mach-O format", 0); | |
1054 | goto fail; | |
1055 | } | |
1056 | ||
1057 | switch (header.filetype) | |
1058 | { | |
1059 | case MACH_O_MH_EXECUTE: | |
1060 | case MACH_O_MH_DYLIB: | |
1061 | case MACH_O_MH_DSYM: | |
1062 | break; | |
1063 | default: | |
1064 | error_callback (data, "executable file is not an executable", 0); | |
1065 | goto fail; | |
1066 | } | |
1067 | ||
1068 | if (!backtrace_get_view (state, descriptor, hdroffset, header.sizeofcmds, | |
1069 | error_callback, data, &cmds_view)) | |
1070 | goto fail; | |
1071 | cmds_view_valid = 1; | |
1072 | ||
1073 | memset (&dwarf_sections, 0, sizeof dwarf_sections); | |
1074 | have_dwarf = 0; | |
1075 | memset (&uuid, 0, sizeof uuid); | |
1076 | have_uuid = 0; | |
1077 | ||
1078 | cmdoffset = 0; | |
1079 | for (i = 0; i < header.ncmds; ++i) | |
1080 | { | |
1081 | const char *pcmd; | |
1082 | struct macho_load_command load_command; | |
1083 | ||
1084 | if (cmdoffset + sizeof load_command > header.sizeofcmds) | |
1085 | break; | |
1086 | ||
1087 | pcmd = (const char *) cmds_view.data + cmdoffset; | |
1088 | memcpy (&load_command, pcmd, sizeof load_command); | |
1089 | ||
1090 | switch (load_command.cmd) | |
1091 | { | |
1092 | case MACH_O_LC_SEGMENT: | |
1093 | { | |
1094 | struct macho_segment_command segcmd; | |
1095 | ||
1096 | memcpy (&segcmd, pcmd, sizeof segcmd); | |
1097 | if (memcmp (segcmd.segname, | |
1098 | "__DWARF\0\0\0\0\0\0\0\0\0", | |
1099 | MACH_O_NAMELEN) == 0) | |
1100 | { | |
1101 | if (!macho_add_dwarf_segment (state, descriptor, offset, | |
1102 | load_command.cmd, | |
1103 | pcmd + sizeof segcmd, | |
1104 | (load_command.cmdsize | |
1105 | - sizeof segcmd), | |
1106 | segcmd.nsects, error_callback, | |
1107 | data, &dwarf_sections)) | |
1108 | goto fail; | |
1109 | have_dwarf = 1; | |
1110 | } | |
1111 | } | |
1112 | break; | |
1113 | ||
1114 | case MACH_O_LC_SEGMENT_64: | |
1115 | { | |
1116 | struct macho_segment_64_command segcmd; | |
1117 | ||
1118 | memcpy (&segcmd, pcmd, sizeof segcmd); | |
1119 | if (memcmp (segcmd.segname, | |
1120 | "__DWARF\0\0\0\0\0\0\0\0\0", | |
1121 | MACH_O_NAMELEN) == 0) | |
1122 | { | |
1123 | if (!macho_add_dwarf_segment (state, descriptor, offset, | |
1124 | load_command.cmd, | |
1125 | pcmd + sizeof segcmd, | |
1126 | (load_command.cmdsize | |
1127 | - sizeof segcmd), | |
1128 | segcmd.nsects, error_callback, | |
1129 | data, &dwarf_sections)) | |
1130 | goto fail; | |
1131 | have_dwarf = 1; | |
1132 | } | |
1133 | } | |
1134 | break; | |
1135 | ||
1136 | case MACH_O_LC_SYMTAB: | |
1137 | if (!skip_symtab) | |
1138 | { | |
1139 | struct macho_symtab_command symcmd; | |
1140 | ||
1141 | memcpy (&symcmd, pcmd, sizeof symcmd); | |
1142 | if (!macho_add_symtab (state, descriptor, base_address, is_64, | |
1143 | offset + symcmd.symoff, symcmd.nsyms, | |
1144 | offset + symcmd.stroff, symcmd.strsize, | |
1145 | error_callback, data)) | |
1146 | goto fail; | |
1147 | ||
1148 | *found_sym = 1; | |
1149 | } | |
1150 | break; | |
1151 | ||
1152 | case MACH_O_LC_UUID: | |
1153 | { | |
1154 | struct macho_uuid_command uuidcmd; | |
1155 | ||
1156 | memcpy (&uuidcmd, pcmd, sizeof uuidcmd); | |
1157 | memcpy (&uuid[0], &uuidcmd.uuid[0], MACH_O_UUID_LEN); | |
1158 | have_uuid = 1; | |
1159 | } | |
1160 | break; | |
1161 | ||
1162 | default: | |
1163 | break; | |
1164 | } | |
1165 | ||
1166 | cmdoffset += load_command.cmdsize; | |
1167 | } | |
1168 | ||
1169 | if (!backtrace_close (descriptor, error_callback, data)) | |
1170 | goto fail; | |
1171 | descriptor = -1; | |
1172 | ||
1173 | backtrace_release_view (state, &cmds_view, error_callback, data); | |
1174 | cmds_view_valid = 0; | |
1175 | ||
1176 | if (match_uuid != NULL) | |
1177 | { | |
1178 | /* If we don't have a UUID, or it doesn't match, just ignore | |
1179 | this file. */ | |
1180 | if (!have_uuid | |
1181 | || memcmp (match_uuid, &uuid[0], MACH_O_UUID_LEN) != 0) | |
1182 | return 1; | |
1183 | } | |
1184 | ||
1185 | if (have_dwarf) | |
1186 | { | |
1187 | int is_big_endian; | |
1188 | ||
1189 | is_big_endian = 0; | |
1190 | #if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) | |
1191 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
1192 | is_big_endian = 1; | |
1193 | #endif | |
1194 | #endif | |
1195 | ||
1196 | if (!backtrace_dwarf_add (state, base_address, &dwarf_sections, | |
1197 | is_big_endian, NULL, error_callback, data, | |
1198 | fileline_fn, NULL)) | |
1199 | goto fail; | |
1200 | } | |
1201 | ||
1202 | if (!have_dwarf && have_uuid) | |
1203 | { | |
1204 | if (!macho_add_dsym (state, filename, base_address, &uuid[0], | |
1205 | error_callback, data, fileline_fn)) | |
1206 | goto fail; | |
1207 | } | |
1208 | ||
1209 | return 1; | |
1210 | ||
1211 | fail: | |
1212 | if (cmds_view_valid) | |
1213 | backtrace_release_view (state, &cmds_view, error_callback, data); | |
1214 | if (descriptor != -1) | |
1215 | backtrace_close (descriptor, error_callback, data); | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | #ifdef HAVE_MACH_O_DYLD_H | |
1220 | ||
1221 | /* Initialize the backtrace data we need from a Mach-O executable | |
1222 | using the dyld support functions. This closes descriptor. */ | |
1223 | ||
1224 | int | |
1225 | backtrace_initialize (struct backtrace_state *state, const char *filename, | |
1226 | int descriptor, backtrace_error_callback error_callback, | |
1227 | void *data, fileline *fileline_fn) | |
1228 | { | |
1229 | uint32_t c; | |
1230 | uint32_t i; | |
1231 | int closed_descriptor; | |
1232 | int found_sym; | |
1233 | fileline macho_fileline_fn; | |
1234 | ||
1235 | closed_descriptor = 0; | |
1236 | found_sym = 0; | |
1237 | macho_fileline_fn = macho_nodebug; | |
1238 | ||
1239 | c = _dyld_image_count (); | |
1240 | for (i = 0; i < c; ++i) | |
1241 | { | |
1242 | uintptr_t base_address; | |
1243 | const char *name; | |
1244 | int d; | |
1245 | fileline mff; | |
1246 | int mfs; | |
1247 | ||
1248 | name = _dyld_get_image_name (i); | |
1249 | if (name == NULL) | |
1250 | continue; | |
1251 | ||
1252 | if (strcmp (name, filename) == 0 && !closed_descriptor) | |
1253 | { | |
1254 | d = descriptor; | |
1255 | closed_descriptor = 1; | |
1256 | } | |
1257 | else | |
1258 | { | |
1259 | int does_not_exist; | |
1260 | ||
1261 | d = backtrace_open (name, error_callback, data, &does_not_exist); | |
1262 | if (d < 0) | |
1263 | continue; | |
1264 | } | |
1265 | ||
1266 | base_address = _dyld_get_image_vmaddr_slide (i); | |
1267 | ||
1268 | mff = macho_nodebug; | |
1269 | if (!macho_add (state, name, d, 0, NULL, base_address, 0, | |
1270 | error_callback, data, &mff, &mfs)) | |
1271 | return 0; | |
1272 | ||
1273 | if (mff != macho_nodebug) | |
1274 | macho_fileline_fn = mff; | |
1275 | if (mfs) | |
1276 | found_sym = 1; | |
1277 | } | |
1278 | ||
1279 | if (!closed_descriptor) | |
1280 | backtrace_close (descriptor, error_callback, data); | |
1281 | ||
1282 | if (!state->threaded) | |
1283 | { | |
1284 | if (found_sym) | |
1285 | state->syminfo_fn = macho_syminfo; | |
1286 | else if (state->syminfo_fn == NULL) | |
1287 | state->syminfo_fn = macho_nosyms; | |
1288 | } | |
1289 | else | |
1290 | { | |
1291 | if (found_sym) | |
1292 | backtrace_atomic_store_pointer (&state->syminfo_fn, macho_syminfo); | |
1293 | else | |
1294 | (void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL, | |
1295 | macho_nosyms); | |
1296 | } | |
1297 | ||
1298 | if (!state->threaded) | |
1299 | *fileline_fn = state->fileline_fn; | |
1300 | else | |
1301 | *fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn); | |
1302 | ||
1303 | if (*fileline_fn == NULL || *fileline_fn == macho_nodebug) | |
1304 | *fileline_fn = macho_fileline_fn; | |
1305 | ||
1306 | return 1; | |
1307 | } | |
1308 | ||
1309 | #else /* !defined (HAVE_MACH_O_DYLD_H) */ | |
1310 | ||
1311 | /* Initialize the backtrace data we need from a Mach-O executable | |
1312 | without using the dyld support functions. This closes | |
1313 | descriptor. */ | |
1314 | ||
1315 | int | |
1316 | backtrace_initialize (struct backtrace_state *state, const char *filename, | |
1317 | int descriptor, backtrace_error_callback error_callback, | |
1318 | void *data, fileline *fileline_fn) | |
1319 | { | |
1320 | fileline macho_fileline_fn; | |
1321 | int found_sym; | |
1322 | ||
1323 | macho_fileline_fn = macho_nodebug; | |
1324 | if (!macho_add (state, filename, descriptor, 0, NULL, 0, 0, | |
1325 | error_callback, data, &macho_fileline_fn, &found_sym)) | |
1326 | return 0; | |
1327 | ||
1328 | if (!state->threaded) | |
1329 | { | |
1330 | if (found_sym) | |
1331 | state->syminfo_fn = macho_syminfo; | |
1332 | else if (state->syminfo_fn == NULL) | |
1333 | state->syminfo_fn = macho_nosyms; | |
1334 | } | |
1335 | else | |
1336 | { | |
1337 | if (found_sym) | |
1338 | backtrace_atomic_store_pointer (&state->syminfo_fn, macho_syminfo); | |
1339 | else | |
1340 | (void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL, | |
1341 | macho_nosyms); | |
1342 | } | |
1343 | ||
1344 | if (!state->threaded) | |
1345 | *fileline_fn = state->fileline_fn; | |
1346 | else | |
1347 | *fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn); | |
1348 | ||
1349 | if (*fileline_fn == NULL || *fileline_fn == macho_nodebug) | |
1350 | *fileline_fn = macho_fileline_fn; | |
1351 | ||
1352 | return 1; | |
1353 | } | |
1354 | ||
1355 | #endif /* !defined (HAVE_MACH_O_DYLD_H) */ |