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ba9703b0 XL |
1 | /* elf.c -- Get debug data from a Mach-O file for backtraces. |
2 | Copyright (C) 2020 Free Software Foundation, Inc. | |
3 | Written by Ian Lance Taylor, Google. | |
ea8adc8c XL |
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 | ||
ea8adc8c | 35 | #include <sys/types.h> |
ea8adc8c XL |
36 | #include <dirent.h> |
37 | #include <stdlib.h> | |
ba9703b0 XL |
38 | #include <string.h> |
39 | ||
40 | #ifdef HAVE_MACH_O_DYLD_H | |
41 | #include <mach-o/dyld.h> | |
42 | #endif | |
ea8adc8c XL |
43 | |
44 | #include "backtrace.h" | |
45 | #include "internal.h" | |
46 | ||
ba9703b0 XL |
47 | /* Mach-O file header for a 32-bit executable. */ |
48 | ||
49 | struct macho_header_32 | |
ea8adc8c | 50 | { |
ba9703b0 XL |
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 */ | |
ea8adc8c XL |
58 | }; |
59 | ||
ba9703b0 XL |
60 | /* Mach-O file header for a 64-bit executable. */ |
61 | ||
62 | struct macho_header_64 | |
ea8adc8c | 63 | { |
ba9703b0 XL |
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 */ | |
ea8adc8c XL |
72 | }; |
73 | ||
ba9703b0 XL |
74 | /* Mach-O file header for a fat executable. */ |
75 | ||
76 | struct macho_header_fat | |
77 | { | |
78 | uint32_t magic; /* Magic number (MACH_O_MH_MAGIC_FAT) */ | |
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 | |
88 | ||
89 | /* Value for the header filetype field. */ | |
90 | ||
91 | #define MACH_O_MH_EXECUTE 0x02 | |
92 | #define MACH_O_MH_DYLIB 0x06 | |
93 | #define MACH_O_MH_DSYM 0x0a | |
94 | ||
95 | /* A component of a fat file. A fat file starts with a | |
96 | macho_header_fat followed by nfat_arch instances of this | |
97 | struct. */ | |
98 | ||
99 | struct macho_fat_arch | |
100 | { | |
101 | uint32_t cputype; /* CPU type */ | |
102 | uint32_t cpusubtype; /* CPU subtype */ | |
103 | uint32_t offset; /* File offset of this entry */ | |
104 | uint32_t size; /* Size of this entry */ | |
105 | uint32_t align; /* Alignment of this entry */ | |
106 | }; | |
107 | ||
108 | /* Values for the fat_arch cputype field (and the header cputype | |
109 | field). */ | |
110 | ||
111 | #define MACH_O_CPU_ARCH_ABI64 0x01000000 | |
112 | ||
113 | #define MACH_O_CPU_TYPE_X86 7 | |
114 | #define MACH_O_CPU_TYPE_ARM 12 | |
115 | ||
116 | #define MACH_O_CPU_TYPE_X86_64 (MACH_O_CPU_TYPE_X86 | MACH_O_CPU_ARCH_ABI64) | |
117 | #define MACH_O_CPU_TYPE_ARM64 (MACH_O_CPU_TYPE_ARM | MACH_O_CPU_ARCH_ABI64) | |
118 | ||
119 | /* The header of a load command. */ | |
120 | ||
121 | struct macho_load_command | |
122 | { | |
123 | uint32_t cmd; /* The type of load command */ | |
124 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
125 | }; | |
126 | ||
127 | /* Values for the load_command cmd field. */ | |
128 | ||
129 | #define MACH_O_LC_SEGMENT 0x01 | |
130 | #define MACH_O_LC_SYMTAB 0x02 | |
131 | #define MACH_O_LC_SEGMENT_64 0x19 | |
132 | #define MACH_O_LC_UUID 0x1b | |
133 | ||
134 | /* The length of a section of segment name. */ | |
135 | ||
136 | #define MACH_O_NAMELEN (16) | |
137 | ||
138 | /* LC_SEGMENT load command. */ | |
139 | ||
140 | struct macho_segment_command | |
141 | { | |
142 | uint32_t cmd; /* The type of load command (LC_SEGMENT) */ | |
143 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
144 | char segname[MACH_O_NAMELEN]; /* Segment name */ | |
145 | uint32_t vmaddr; /* Virtual memory address */ | |
146 | uint32_t vmsize; /* Virtual memory size */ | |
147 | uint32_t fileoff; /* Offset of data to be mapped */ | |
148 | uint32_t filesize; /* Size of data in file */ | |
149 | uint32_t maxprot; /* Maximum permitted virtual protection */ | |
150 | uint32_t initprot; /* Initial virtual memory protection */ | |
151 | uint32_t nsects; /* Number of sections in this segment */ | |
152 | uint32_t flags; /* Flags */ | |
153 | }; | |
154 | ||
155 | /* LC_SEGMENT_64 load command. */ | |
156 | ||
157 | struct macho_segment_64_command | |
158 | { | |
159 | uint32_t cmd; /* The type of load command (LC_SEGMENT) */ | |
160 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
161 | char segname[MACH_O_NAMELEN]; /* Segment name */ | |
162 | uint64_t vmaddr; /* Virtual memory address */ | |
163 | uint64_t vmsize; /* Virtual memory size */ | |
164 | uint64_t fileoff; /* Offset of data to be mapped */ | |
165 | uint64_t filesize; /* Size of data in file */ | |
166 | uint32_t maxprot; /* Maximum permitted virtual protection */ | |
167 | uint32_t initprot; /* Initial virtual memory protection */ | |
168 | uint32_t nsects; /* Number of sections in this segment */ | |
169 | uint32_t flags; /* Flags */ | |
170 | }; | |
171 | ||
172 | /* LC_SYMTAB load command. */ | |
173 | ||
174 | struct macho_symtab_command | |
175 | { | |
176 | uint32_t cmd; /* The type of load command (LC_SEGMENT) */ | |
177 | uint32_t cmdsize; /* Size in bytes of the entire command */ | |
178 | uint32_t symoff; /* File offset of symbol table */ | |
179 | uint32_t nsyms; /* Number of symbols */ | |
180 | uint32_t stroff; /* File offset of string table */ | |
181 | uint32_t strsize; /* String table size */ | |
182 | }; | |
183 | ||
184 | /* The length of a Mach-O uuid. */ | |
185 | ||
186 | #define MACH_O_UUID_LEN (16) | |
187 | ||
188 | /* LC_UUID load command. */ | |
189 | ||
190 | struct macho_uuid_command | |
ea8adc8c | 191 | { |
ba9703b0 XL |
192 | uint32_t cmd; /* Type of load command (LC_UUID) */ |
193 | uint32_t cmdsize; /* Size in bytes of command */ | |
194 | unsigned char uuid[MACH_O_UUID_LEN]; /* UUID */ | |
ea8adc8c XL |
195 | }; |
196 | ||
ba9703b0 XL |
197 | /* 32-bit section header within a LC_SEGMENT segment. */ |
198 | ||
199 | struct macho_section | |
200 | { | |
201 | char sectname[MACH_O_NAMELEN]; /* Section name */ | |
202 | char segment[MACH_O_NAMELEN]; /* Segment of this section */ | |
203 | uint32_t addr; /* Address in memory */ | |
204 | uint32_t size; /* Section size */ | |
205 | uint32_t offset; /* File offset */ | |
206 | uint32_t align; /* Log2 of section alignment */ | |
207 | uint32_t reloff; /* File offset of relocations */ | |
208 | uint32_t nreloc; /* Number of relocs for this section */ | |
209 | uint32_t flags; /* Flags */ | |
210 | uint32_t reserved1; | |
211 | uint32_t reserved2; | |
212 | }; | |
213 | ||
214 | /* 64-bit section header within a LC_SEGMENT_64 segment. */ | |
215 | ||
216 | struct macho_section_64 | |
217 | { | |
218 | char sectname[MACH_O_NAMELEN]; /* Section name */ | |
219 | char segment[MACH_O_NAMELEN]; /* Segment of this section */ | |
220 | uint64_t addr; /* Address in memory */ | |
221 | uint64_t size; /* Section size */ | |
222 | uint32_t offset; /* File offset */ | |
223 | uint32_t align; /* Log2 of section alignment */ | |
224 | uint32_t reloff; /* File offset of section relocations */ | |
225 | uint32_t nreloc; /* Number of relocs for this section */ | |
226 | uint32_t flags; /* Flags */ | |
227 | uint32_t reserved1; | |
228 | uint32_t reserved2; | |
229 | uint32_t reserved3; | |
230 | }; | |
231 | ||
232 | /* 32-bit symbol data. */ | |
233 | ||
234 | struct macho_nlist | |
235 | { | |
236 | uint32_t n_strx; /* Index of name in string table */ | |
237 | uint8_t n_type; /* Type flag */ | |
238 | uint8_t n_sect; /* Section number */ | |
239 | uint16_t n_desc; /* Stabs description field */ | |
240 | uint32_t n_value; /* Value */ | |
241 | }; | |
242 | ||
243 | /* 64-bit symbol data. */ | |
244 | ||
245 | struct macho_nlist_64 | |
246 | { | |
247 | uint32_t n_strx; /* Index of name in string table */ | |
248 | uint8_t n_type; /* Type flag */ | |
249 | uint8_t n_sect; /* Section number */ | |
250 | uint16_t n_desc; /* Stabs description field */ | |
251 | uint64_t n_value; /* Value */ | |
252 | }; | |
253 | ||
254 | /* Value found in nlist n_type field. */ | |
255 | ||
256 | #define MACH_O_N_EXT 0x01 /* Extern symbol */ | |
257 | #define MACH_O_N_ABS 0x02 /* Absolute symbol */ | |
258 | #define MACH_O_N_SECT 0x0e /* Defined in section */ | |
259 | ||
260 | #define MACH_O_N_TYPE 0x0e /* Mask for type bits */ | |
261 | #define MACH_O_N_STAB 0xe0 /* Stabs debugging symbol */ | |
262 | ||
263 | /* Information we keep for a Mach-O symbol. */ | |
264 | ||
ea8adc8c XL |
265 | struct macho_symbol |
266 | { | |
ba9703b0 XL |
267 | const char *name; /* Symbol name */ |
268 | uintptr_t address; /* Symbol address */ | |
ea8adc8c XL |
269 | }; |
270 | ||
ba9703b0 XL |
271 | /* Information to pass to macho_syminfo. */ |
272 | ||
ea8adc8c XL |
273 | struct macho_syminfo_data |
274 | { | |
ba9703b0 XL |
275 | struct macho_syminfo_data *next; /* Next module */ |
276 | struct macho_symbol *symbols; /* Symbols sorted by address */ | |
277 | size_t count; /* Number of symbols */ | |
ea8adc8c XL |
278 | }; |
279 | ||
ba9703b0 XL |
280 | /* Names of sections, indexed by enum dwarf_section in internal.h. */ |
281 | ||
282 | static const char * const dwarf_section_names[DEBUG_MAX] = | |
ea8adc8c | 283 | { |
ba9703b0 XL |
284 | "__debug_info", |
285 | "__debug_line", | |
286 | "__debug_abbrev", | |
287 | "__debug_ranges", | |
288 | "__debug_str", | |
289 | "", /* DEBUG_ADDR */ | |
290 | "__debug_str_offs", | |
291 | "", /* DEBUG_LINE_STR */ | |
292 | "__debug_rnglists" | |
293 | }; | |
294 | ||
295 | /* Forward declaration. */ | |
296 | ||
297 | static int macho_add (struct backtrace_state *, const char *, int, off_t, | |
298 | const unsigned char *, uintptr_t, int, | |
299 | backtrace_error_callback, void *, fileline *, int *); | |
300 | ||
301 | /* A dummy callback function used when we can't find any debug info. */ | |
302 | ||
303 | static int | |
304 | macho_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED, | |
305 | uintptr_t pc ATTRIBUTE_UNUSED, | |
306 | backtrace_full_callback callback ATTRIBUTE_UNUSED, | |
307 | backtrace_error_callback error_callback, void *data) | |
308 | { | |
309 | error_callback (data, "no debug info in Mach-O executable", -1); | |
310 | return 0; | |
ea8adc8c XL |
311 | } |
312 | ||
ba9703b0 XL |
313 | /* A dummy callback function used when we can't find a symbol |
314 | table. */ | |
315 | ||
316 | static void | |
317 | macho_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED, | |
318 | uintptr_t addr ATTRIBUTE_UNUSED, | |
319 | backtrace_syminfo_callback callback ATTRIBUTE_UNUSED, | |
320 | backtrace_error_callback error_callback, void *data) | |
ea8adc8c | 321 | { |
ba9703b0 | 322 | error_callback (data, "no symbol table in Mach-O executable", -1); |
ea8adc8c XL |
323 | } |
324 | ||
ba9703b0 XL |
325 | /* Add a single DWARF section to DWARF_SECTIONS, if we need the |
326 | section. Returns 1 on success, 0 on failure. */ | |
327 | ||
328 | static int | |
329 | macho_add_dwarf_section (struct backtrace_state *state, int descriptor, | |
330 | const char *sectname, uint32_t offset, uint64_t size, | |
331 | backtrace_error_callback error_callback, void *data, | |
332 | struct dwarf_sections *dwarf_sections) | |
ea8adc8c | 333 | { |
ba9703b0 XL |
334 | int i; |
335 | ||
336 | for (i = 0; i < (int) DEBUG_MAX; ++i) | |
ea8adc8c | 337 | { |
ba9703b0 XL |
338 | if (dwarf_section_names[i][0] != '\0' |
339 | && strncmp (sectname, dwarf_section_names[i], MACH_O_NAMELEN) == 0) | |
340 | { | |
341 | struct backtrace_view section_view; | |
342 | ||
343 | /* FIXME: Perhaps it would be better to try to use a single | |
344 | view to read all the DWARF data, as we try to do for | |
345 | ELF. */ | |
346 | ||
347 | if (!backtrace_get_view (state, descriptor, offset, size, | |
348 | error_callback, data, §ion_view)) | |
349 | return 0; | |
350 | dwarf_sections->data[i] = (const unsigned char *) section_view.data; | |
351 | dwarf_sections->size[i] = size; | |
352 | break; | |
353 | } | |
ea8adc8c | 354 | } |
ba9703b0 | 355 | return 1; |
ea8adc8c XL |
356 | } |
357 | ||
ba9703b0 XL |
358 | /* Collect DWARF sections from a DWARF segment. Returns 1 on success, |
359 | 0 on failure. */ | |
ea8adc8c | 360 | |
ba9703b0 XL |
361 | static int |
362 | macho_add_dwarf_segment (struct backtrace_state *state, int descriptor, | |
363 | off_t offset, unsigned int cmd, const char *psecs, | |
364 | size_t sizesecs, unsigned int nsects, | |
365 | backtrace_error_callback error_callback, void *data, | |
366 | struct dwarf_sections *dwarf_sections) | |
ea8adc8c | 367 | { |
ba9703b0 XL |
368 | size_t sec_header_size; |
369 | size_t secoffset; | |
370 | unsigned int i; | |
ea8adc8c | 371 | |
ba9703b0 | 372 | switch (cmd) |
ea8adc8c | 373 | { |
ba9703b0 XL |
374 | case MACH_O_LC_SEGMENT: |
375 | sec_header_size = sizeof (struct macho_section); | |
ea8adc8c | 376 | break; |
ba9703b0 XL |
377 | case MACH_O_LC_SEGMENT_64: |
378 | sec_header_size = sizeof (struct macho_section_64); | |
ea8adc8c | 379 | break; |
ba9703b0 XL |
380 | default: |
381 | abort (); | |
ea8adc8c XL |
382 | } |
383 | ||
ba9703b0 XL |
384 | secoffset = 0; |
385 | for (i = 0; i < nsects; ++i) | |
ea8adc8c | 386 | { |
ba9703b0 XL |
387 | if (secoffset + sec_header_size > sizesecs) |
388 | { | |
389 | error_callback (data, "section overflow withing segment", 0); | |
390 | return 0; | |
391 | } | |
392 | ||
393 | switch (cmd) | |
394 | { | |
395 | case MACH_O_LC_SEGMENT: | |
396 | { | |
397 | struct macho_section section; | |
398 | ||
399 | memcpy (§ion, psecs + secoffset, sizeof section); | |
400 | macho_add_dwarf_section (state, descriptor, section.sectname, | |
401 | offset + section.offset, section.size, | |
402 | error_callback, data, dwarf_sections); | |
403 | } | |
404 | break; | |
405 | ||
406 | case MACH_O_LC_SEGMENT_64: | |
407 | { | |
408 | struct macho_section_64 section; | |
409 | ||
410 | memcpy (§ion, psecs + secoffset, sizeof section); | |
411 | macho_add_dwarf_section (state, descriptor, section.sectname, | |
412 | offset + section.offset, section.size, | |
413 | error_callback, data, dwarf_sections); | |
414 | } | |
415 | break; | |
416 | ||
417 | default: | |
418 | abort (); | |
419 | } | |
420 | ||
421 | secoffset += sec_header_size; | |
ea8adc8c | 422 | } |
ea8adc8c | 423 | |
ba9703b0 | 424 | return 1; |
ea8adc8c XL |
425 | } |
426 | ||
ba9703b0 | 427 | /* Compare struct macho_symbol for qsort. */ |
ea8adc8c | 428 | |
ba9703b0 XL |
429 | static int |
430 | macho_symbol_compare (const void *v1, const void *v2) | |
431 | { | |
432 | const struct macho_symbol *m1 = (const struct macho_symbol *) v1; | |
433 | const struct macho_symbol *m2 = (const struct macho_symbol *) v2; | |
ea8adc8c | 434 | |
ba9703b0 XL |
435 | if (m1->address < m2->address) |
436 | return -1; | |
437 | else if (m1->address > m2->address) | |
ea8adc8c XL |
438 | return 1; |
439 | else | |
ba9703b0 | 440 | return 0; |
ea8adc8c XL |
441 | } |
442 | ||
ba9703b0 XL |
443 | /* Compare an address against a macho_symbol for bsearch. We allocate |
444 | one extra entry in the array so that this can safely look at the | |
445 | next entry. */ | |
446 | ||
ea8adc8c | 447 | static int |
ba9703b0 | 448 | macho_symbol_search (const void *vkey, const void *ventry) |
ea8adc8c | 449 | { |
ba9703b0 XL |
450 | const uintptr_t *key = (const uintptr_t *) vkey; |
451 | const struct macho_symbol *entry = (const struct macho_symbol *) ventry; | |
452 | uintptr_t addr; | |
ea8adc8c | 453 | |
ba9703b0 XL |
454 | addr = *key; |
455 | if (addr < entry->address) | |
ea8adc8c | 456 | return -1; |
ba9703b0 XL |
457 | else if (entry->name[0] == '\0' |
458 | && entry->address == ~(uintptr_t) 0) | |
459 | return -1; | |
460 | else if ((entry + 1)->name[0] == '\0' | |
461 | && (entry + 1)->address == ~(uintptr_t) 0) | |
462 | return -1; | |
463 | else if (addr >= (entry + 1)->address) | |
464 | return 1; | |
ea8adc8c XL |
465 | else |
466 | return 0; | |
467 | } | |
468 | ||
ba9703b0 XL |
469 | /* Return whether the symbol type field indicates a symbol table entry |
470 | that we care about: a function or data symbol. */ | |
ea8adc8c | 471 | |
ba9703b0 XL |
472 | static int |
473 | macho_defined_symbol (uint8_t type) | |
474 | { | |
475 | if ((type & MACH_O_N_STAB) != 0) | |
476 | return 0; | |
477 | switch (type & MACH_O_N_TYPE) | |
478 | { | |
479 | case MACH_O_N_ABS: | |
480 | return 1; | |
481 | case MACH_O_N_SECT: | |
482 | return 1; | |
483 | default: | |
484 | return 0; | |
485 | } | |
ea8adc8c XL |
486 | } |
487 | ||
ba9703b0 XL |
488 | /* Add symbol table information for a Mach-O file. */ |
489 | ||
490 | static int | |
491 | macho_add_symtab (struct backtrace_state *state, int descriptor, | |
492 | uintptr_t base_address, int is_64, | |
493 | off_t symoff, unsigned int nsyms, off_t stroff, | |
494 | unsigned int strsize, | |
495 | backtrace_error_callback error_callback, void *data) | |
ea8adc8c | 496 | { |
ba9703b0 XL |
497 | size_t symsize; |
498 | struct backtrace_view sym_view; | |
499 | int sym_view_valid; | |
500 | struct backtrace_view str_view; | |
501 | int str_view_valid; | |
502 | size_t ndefs; | |
503 | size_t symtaboff; | |
504 | unsigned int i; | |
505 | size_t macho_symbol_size; | |
506 | struct macho_symbol *macho_symbols; | |
507 | unsigned int j; | |
508 | struct macho_syminfo_data *sdata; | |
509 | ||
510 | sym_view_valid = 0; | |
511 | str_view_valid = 0; | |
512 | macho_symbol_size = 0; | |
513 | macho_symbols = NULL; | |
514 | ||
515 | if (is_64) | |
516 | symsize = sizeof (struct macho_nlist_64); | |
517 | else | |
518 | symsize = sizeof (struct macho_nlist); | |
ea8adc8c | 519 | |
ba9703b0 XL |
520 | if (!backtrace_get_view (state, descriptor, symoff, nsyms * symsize, |
521 | error_callback, data, &sym_view)) | |
522 | goto fail; | |
523 | sym_view_valid = 1; | |
524 | ||
525 | if (!backtrace_get_view (state, descriptor, stroff, strsize, | |
526 | error_callback, data, &str_view)) | |
527 | return 0; | |
528 | str_view_valid = 1; | |
529 | ||
530 | ndefs = 0; | |
531 | symtaboff = 0; | |
532 | for (i = 0; i < nsyms; ++i, symtaboff += symsize) | |
533 | { | |
534 | if (is_64) | |
535 | { | |
536 | struct macho_nlist_64 nlist; | |
537 | ||
538 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
539 | sizeof nlist); | |
540 | if (macho_defined_symbol (nlist.n_type)) | |
541 | ++ndefs; | |
542 | } | |
543 | else | |
544 | { | |
545 | struct macho_nlist nlist; | |
546 | ||
547 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
548 | sizeof nlist); | |
549 | if (macho_defined_symbol (nlist.n_type)) | |
550 | ++ndefs; | |
551 | } | |
552 | } | |
ea8adc8c | 553 | |
ba9703b0 XL |
554 | /* Add 1 to ndefs to make room for a sentinel. */ |
555 | macho_symbol_size = (ndefs + 1) * sizeof (struct macho_symbol); | |
556 | macho_symbols = ((struct macho_symbol *) | |
557 | backtrace_alloc (state, macho_symbol_size, error_callback, | |
558 | data)); | |
559 | if (macho_symbols == NULL) | |
560 | goto fail; | |
561 | ||
562 | j = 0; | |
563 | symtaboff = 0; | |
564 | for (i = 0; i < nsyms; ++i, symtaboff += symsize) | |
ea8adc8c | 565 | { |
ba9703b0 XL |
566 | uint32_t strx; |
567 | uint64_t value; | |
568 | const char *name; | |
569 | ||
570 | strx = 0; | |
571 | value = 0; | |
572 | if (is_64) | |
573 | { | |
574 | struct macho_nlist_64 nlist; | |
575 | ||
576 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
577 | sizeof nlist); | |
578 | if (!macho_defined_symbol (nlist.n_type)) | |
579 | continue; | |
580 | ||
581 | strx = nlist.n_strx; | |
582 | value = nlist.n_value; | |
583 | } | |
584 | else | |
585 | { | |
586 | struct macho_nlist nlist; | |
587 | ||
588 | memcpy (&nlist, (const char *) sym_view.data + symtaboff, | |
589 | sizeof nlist); | |
590 | if (!macho_defined_symbol (nlist.n_type)) | |
591 | continue; | |
592 | ||
593 | strx = nlist.n_strx; | |
594 | value = nlist.n_value; | |
595 | } | |
596 | ||
597 | if (strx >= strsize) | |
598 | { | |
599 | error_callback (data, "symbol string index out of range", 0); | |
600 | goto fail; | |
601 | } | |
602 | ||
603 | name = (const char *) str_view.data + strx; | |
604 | if (name[0] == '_') | |
605 | ++name; | |
606 | macho_symbols[j].name = name; | |
607 | macho_symbols[j].address = value + base_address; | |
608 | ++j; | |
ea8adc8c XL |
609 | } |
610 | ||
ba9703b0 XL |
611 | sdata = ((struct macho_syminfo_data *) |
612 | backtrace_alloc (state, sizeof *sdata, error_callback, data)); | |
613 | if (sdata == NULL) | |
614 | goto fail; | |
ea8adc8c | 615 | |
ba9703b0 XL |
616 | /* We need to keep the string table since it holds the names, but we |
617 | can release the symbol table. */ | |
ea8adc8c | 618 | |
ba9703b0 XL |
619 | backtrace_release_view (state, &sym_view, error_callback, data); |
620 | sym_view_valid = 0; | |
621 | str_view_valid = 0; | |
622 | ||
623 | /* Add a trailing sentinel symbol. */ | |
624 | macho_symbols[j].name = ""; | |
625 | macho_symbols[j].address = ~(uintptr_t) 0; | |
626 | ||
627 | backtrace_qsort (macho_symbols, ndefs + 1, sizeof (struct macho_symbol), | |
628 | macho_symbol_compare); | |
ea8adc8c | 629 | |
ba9703b0 XL |
630 | sdata->next = NULL; |
631 | sdata->symbols = macho_symbols; | |
632 | sdata->count = ndefs; | |
ea8adc8c | 633 | |
ba9703b0 | 634 | if (!state->threaded) |
ea8adc8c | 635 | { |
ba9703b0 XL |
636 | struct macho_syminfo_data **pp; |
637 | ||
638 | for (pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data; | |
639 | *pp != NULL; | |
640 | pp = &(*pp)->next) | |
641 | ; | |
642 | *pp = sdata; | |
ea8adc8c | 643 | } |
ba9703b0 XL |
644 | else |
645 | { | |
646 | while (1) | |
647 | { | |
648 | struct macho_syminfo_data **pp; | |
649 | ||
650 | pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data; | |
651 | ||
652 | while (1) | |
653 | { | |
654 | struct macho_syminfo_data *p; | |
655 | ||
656 | p = backtrace_atomic_load_pointer (pp); | |
657 | ||
658 | if (p == NULL) | |
659 | break; | |
660 | ||
661 | pp = &p->next; | |
662 | } | |
ea8adc8c | 663 | |
ba9703b0 XL |
664 | if (__sync_bool_compare_and_swap (pp, NULL, sdata)) |
665 | break; | |
666 | } | |
667 | } | |
668 | ||
669 | return 1; | |
670 | ||
671 | fail: | |
672 | if (macho_symbols != NULL) | |
673 | backtrace_free (state, macho_symbols, macho_symbol_size, | |
674 | error_callback, data); | |
675 | if (sym_view_valid) | |
676 | backtrace_release_view (state, &sym_view, error_callback, data); | |
677 | if (str_view_valid) | |
678 | backtrace_release_view (state, &str_view, error_callback, data); | |
679 | return 0; | |
680 | } | |
681 | ||
682 | /* Return the symbol name and value for an ADDR. */ | |
683 | ||
684 | static void | |
685 | macho_syminfo (struct backtrace_state *state, uintptr_t addr, | |
686 | backtrace_syminfo_callback callback, | |
687 | backtrace_error_callback error_callback ATTRIBUTE_UNUSED, | |
688 | void *data) | |
689 | { | |
690 | struct macho_syminfo_data *sdata; | |
691 | struct macho_symbol *sym; | |
692 | ||
693 | sym = NULL; | |
694 | if (!state->threaded) | |
ea8adc8c | 695 | { |
ba9703b0 XL |
696 | for (sdata = (struct macho_syminfo_data *) state->syminfo_data; |
697 | sdata != NULL; | |
698 | sdata = sdata->next) | |
699 | { | |
700 | sym = ((struct macho_symbol *) | |
701 | bsearch (&addr, sdata->symbols, sdata->count, | |
702 | sizeof (struct macho_symbol), macho_symbol_search)); | |
703 | if (sym != NULL) | |
704 | break; | |
705 | } | |
ea8adc8c | 706 | } |
ba9703b0 | 707 | else |
ea8adc8c | 708 | { |
ba9703b0 XL |
709 | struct macho_syminfo_data **pp; |
710 | ||
711 | pp = (struct macho_syminfo_data **) (void *) &state->syminfo_data; | |
712 | while (1) | |
713 | { | |
714 | sdata = backtrace_atomic_load_pointer (pp); | |
715 | if (sdata == NULL) | |
716 | break; | |
717 | ||
718 | sym = ((struct macho_symbol *) | |
719 | bsearch (&addr, sdata->symbols, sdata->count, | |
720 | sizeof (struct macho_symbol), macho_symbol_search)); | |
721 | if (sym != NULL) | |
722 | break; | |
723 | ||
724 | pp = &sdata->next; | |
725 | } | |
ea8adc8c XL |
726 | } |
727 | ||
ba9703b0 XL |
728 | if (sym == NULL) |
729 | callback (data, addr, NULL, 0, 0); | |
730 | else | |
731 | callback (data, addr, sym->name, sym->address, 0); | |
732 | } | |
ea8adc8c | 733 | |
ba9703b0 XL |
734 | /* Look through a fat file to find the relevant executable. Returns 1 |
735 | on success, 0 on failure (in both cases descriptor is closed). */ | |
ea8adc8c | 736 | |
ba9703b0 XL |
737 | static int |
738 | macho_add_fat (struct backtrace_state *state, const char *filename, | |
739 | int descriptor, int swapped, off_t offset, | |
740 | const unsigned char *match_uuid, uintptr_t base_address, | |
741 | int skip_symtab, uint32_t nfat_arch, | |
742 | backtrace_error_callback error_callback, void *data, | |
743 | fileline *fileline_fn, int *found_sym) | |
744 | { | |
745 | int arch_view_valid; | |
746 | unsigned int cputype; | |
747 | struct backtrace_view arch_view; | |
748 | size_t archoffset; | |
749 | unsigned int i; | |
750 | ||
751 | arch_view_valid = 0; | |
752 | ||
753 | #if defined (__x86_64__) | |
754 | cputype = MACH_O_CPU_TYPE_X86_64; | |
755 | #elif defined (__i386__) | |
756 | cputype = MACH_O_CPU_TYPE_X86; | |
757 | #elif defined (__aarch64__) | |
758 | cputype = MACH_O_CPU_TYPE_ARM64; | |
759 | #elif defined (__arm__) | |
760 | cputype = MACH_O_CPU_TYPE_ARM; | |
761 | #else | |
762 | error_callback (data, "unknown Mach-O architecture", 0); | |
763 | goto fail; | |
764 | #endif | |
765 | ||
766 | if (!backtrace_get_view (state, descriptor, offset, | |
767 | nfat_arch * sizeof (struct macho_fat_arch), | |
768 | error_callback, data, &arch_view)) | |
769 | goto fail; | |
ea8adc8c | 770 | |
ba9703b0 XL |
771 | archoffset = 0; |
772 | for (i = 0; i < nfat_arch; ++i) | |
ea8adc8c | 773 | { |
ba9703b0 XL |
774 | struct macho_fat_arch fat_arch; |
775 | uint32_t fcputype; | |
776 | ||
777 | memcpy (&fat_arch, | |
778 | ((const char *) arch_view.data | |
779 | + i * sizeof (struct macho_fat_arch)), | |
780 | sizeof fat_arch); | |
781 | ||
782 | fcputype = fat_arch.cputype; | |
783 | if (swapped) | |
784 | fcputype = __builtin_bswap32 (fcputype); | |
785 | ||
786 | if (fcputype == cputype) | |
787 | { | |
788 | uint32_t foffset; | |
789 | ||
790 | /* FIXME: What about cpusubtype? */ | |
791 | foffset = fat_arch.offset; | |
792 | if (swapped) | |
793 | foffset = __builtin_bswap32 (foffset); | |
794 | backtrace_release_view (state, &arch_view, error_callback, data); | |
795 | return macho_add (state, filename, descriptor, foffset, match_uuid, | |
796 | base_address, skip_symtab, error_callback, data, | |
797 | fileline_fn, found_sym); | |
798 | } | |
799 | ||
800 | archoffset += sizeof (struct macho_fat_arch); | |
ea8adc8c XL |
801 | } |
802 | ||
ba9703b0 XL |
803 | error_callback (data, "could not find executable in fat file", 0); |
804 | ||
805 | fail: | |
806 | if (arch_view_valid) | |
807 | backtrace_release_view (state, &arch_view, error_callback, data); | |
808 | if (descriptor != -1) | |
809 | backtrace_close (descriptor, error_callback, data); | |
810 | return 0; | |
811 | } | |
812 | ||
813 | /* Look for the dsym file for FILENAME. This is called if FILENAME | |
814 | does not have debug info or a symbol table. Returns 1 on success, | |
815 | 0 on failure. */ | |
816 | ||
817 | static int | |
818 | macho_add_dsym (struct backtrace_state *state, const char *filename, | |
819 | uintptr_t base_address, const unsigned char *uuid, | |
820 | backtrace_error_callback error_callback, void *data, | |
821 | fileline* fileline_fn) | |
822 | { | |
823 | const char *p; | |
824 | const char *dirname; | |
825 | char *diralc; | |
826 | size_t dirnamelen; | |
827 | const char *basename; | |
828 | size_t basenamelen; | |
829 | const char *dsymsuffixdir; | |
830 | size_t dsymsuffixdirlen; | |
831 | size_t dsymlen; | |
832 | char *dsym; | |
833 | char *ps; | |
834 | int d; | |
835 | int does_not_exist; | |
836 | int dummy_found_sym; | |
837 | ||
838 | diralc = NULL; | |
839 | dirnamelen = 0; | |
840 | dsym = NULL; | |
841 | dsymlen = 0; | |
842 | ||
843 | p = strrchr (filename, '/'); | |
844 | if (p == NULL) | |
ea8adc8c | 845 | { |
ba9703b0 XL |
846 | dirname = "."; |
847 | dirnamelen = 1; | |
848 | basename = filename; | |
849 | basenamelen = strlen (basename); | |
850 | diralc = NULL; | |
851 | } | |
852 | else | |
853 | { | |
854 | dirnamelen = p - filename; | |
855 | diralc = backtrace_alloc (state, dirnamelen + 1, error_callback, data); | |
856 | if (diralc == NULL) | |
857 | goto fail; | |
858 | memcpy (diralc, filename, dirnamelen); | |
859 | diralc[dirnamelen] = '\0'; | |
860 | dirname = diralc; | |
861 | basename = p + 1; | |
862 | basenamelen = strlen (basename); | |
ea8adc8c XL |
863 | } |
864 | ||
ba9703b0 XL |
865 | dsymsuffixdir = ".dSYM/Contents/Resources/DWARF/"; |
866 | dsymsuffixdirlen = strlen (dsymsuffixdir); | |
867 | ||
868 | dsymlen = (dirnamelen | |
869 | + basenamelen | |
870 | + dsymsuffixdirlen | |
871 | + basenamelen | |
872 | + 2); | |
873 | dsym = backtrace_alloc (state, dsymlen, error_callback, data); | |
874 | if (dsym == NULL) | |
875 | goto fail; | |
876 | ||
877 | ps = dsym; | |
878 | memcpy (ps, dirname, dirnamelen); | |
879 | ps += dirnamelen; | |
880 | *ps++ = '/'; | |
881 | memcpy (ps, basename, basenamelen); | |
882 | ps += basenamelen; | |
883 | memcpy (ps, dsymsuffixdir, dsymsuffixdirlen); | |
884 | ps += dsymsuffixdirlen; | |
885 | memcpy (ps, basename, basenamelen); | |
886 | ps += basenamelen; | |
887 | *ps = '\0'; | |
888 | ||
889 | if (diralc != NULL) | |
890 | { | |
891 | backtrace_free (state, diralc, dirnamelen, error_callback, data); | |
892 | diralc = NULL; | |
893 | } | |
ea8adc8c | 894 | |
ba9703b0 XL |
895 | d = backtrace_open (dsym, error_callback, data, &does_not_exist); |
896 | if (d < 0) | |
ea8adc8c | 897 | { |
ba9703b0 XL |
898 | /* The file does not exist, so we can't read the debug info. |
899 | Just return success. */ | |
900 | backtrace_free (state, dsym, dsymlen, error_callback, data); | |
901 | return 1; | |
ea8adc8c XL |
902 | } |
903 | ||
ba9703b0 XL |
904 | if (!macho_add (state, dsym, d, 0, uuid, base_address, 1, |
905 | error_callback, data, fileline_fn, &dummy_found_sym)) | |
906 | goto fail; | |
907 | ||
908 | backtrace_free (state, dsym, dsymlen, error_callback, data); | |
909 | ||
910 | return 1; | |
911 | ||
912 | fail: | |
913 | if (dsym != NULL) | |
914 | backtrace_free (state, dsym, dsymlen, error_callback, data); | |
915 | if (diralc != NULL) | |
916 | backtrace_free (state, diralc, dirnamelen, error_callback, data); | |
917 | return 0; | |
ea8adc8c XL |
918 | } |
919 | ||
ba9703b0 XL |
920 | /* Add the backtrace data for a Macho-O file. Returns 1 on success, 0 |
921 | on failure (in both cases descriptor is closed). | |
922 | ||
923 | FILENAME: the name of the executable. | |
924 | DESCRIPTOR: an open descriptor for the executable, closed here. | |
925 | OFFSET: the offset within the file of this executable, for fat files. | |
926 | MATCH_UUID: if not NULL, UUID that must match. | |
927 | BASE_ADDRESS: the load address of the executable. | |
928 | SKIP_SYMTAB: if non-zero, ignore the symbol table; used for dSYM files. | |
929 | FILELINE_FN: set to the fileline function, by backtrace_dwarf_add. | |
930 | FOUND_SYM: set to non-zero if we found the symbol table. | |
931 | */ | |
932 | ||
933 | static int | |
934 | macho_add (struct backtrace_state *state, const char *filename, int descriptor, | |
935 | off_t offset, const unsigned char *match_uuid, | |
936 | uintptr_t base_address, int skip_symtab, | |
937 | backtrace_error_callback error_callback, void *data, | |
938 | fileline *fileline_fn, int *found_sym) | |
ea8adc8c | 939 | { |
ba9703b0 XL |
940 | struct backtrace_view header_view; |
941 | struct macho_header_32 header; | |
942 | off_t hdroffset; | |
943 | int is_64; | |
944 | struct backtrace_view cmds_view; | |
945 | int cmds_view_valid; | |
946 | struct dwarf_sections dwarf_sections; | |
947 | int have_dwarf; | |
948 | unsigned char uuid[MACH_O_UUID_LEN]; | |
949 | int have_uuid; | |
950 | size_t cmdoffset; | |
951 | unsigned int i; | |
952 | ||
ea8adc8c | 953 | *found_sym = 0; |
ea8adc8c | 954 | |
ba9703b0 XL |
955 | cmds_view_valid = 0; |
956 | ||
957 | /* The 32-bit and 64-bit file headers start out the same, so we can | |
958 | just always read the 32-bit version. A fat header is shorter but | |
959 | it will always be followed by data, so it's OK to read extra. */ | |
960 | ||
961 | if (!backtrace_get_view (state, descriptor, offset, | |
962 | sizeof (struct macho_header_32), | |
963 | error_callback, data, &header_view)) | |
964 | goto fail; | |
965 | ||
966 | memcpy (&header, header_view.data, sizeof header); | |
ea8adc8c | 967 | |
ba9703b0 XL |
968 | backtrace_release_view (state, &header_view, error_callback, data); |
969 | ||
970 | switch (header.magic) | |
ea8adc8c | 971 | { |
ba9703b0 XL |
972 | case MACH_O_MH_MAGIC_32: |
973 | is_64 = 0; | |
974 | hdroffset = offset + sizeof (struct macho_header_32); | |
975 | break; | |
976 | case MACH_O_MH_MAGIC_64: | |
977 | is_64 = 1; | |
978 | hdroffset = offset + sizeof (struct macho_header_64); | |
979 | break; | |
980 | case MACH_O_MH_MAGIC_FAT: | |
981 | { | |
982 | struct macho_header_fat fat_header; | |
983 | ||
984 | hdroffset = offset + sizeof (struct macho_header_fat); | |
985 | memcpy (&fat_header, &header, sizeof fat_header); | |
986 | return macho_add_fat (state, filename, descriptor, 0, hdroffset, | |
987 | match_uuid, base_address, skip_symtab, | |
988 | fat_header.nfat_arch, error_callback, data, | |
989 | fileline_fn, found_sym); | |
990 | } | |
991 | case MACH_O_MH_CIGAM_FAT: | |
992 | { | |
993 | struct macho_header_fat fat_header; | |
994 | uint32_t nfat_arch; | |
995 | ||
996 | hdroffset = offset + sizeof (struct macho_header_fat); | |
997 | memcpy (&fat_header, &header, sizeof fat_header); | |
998 | nfat_arch = __builtin_bswap32 (fat_header.nfat_arch); | |
999 | return macho_add_fat (state, filename, descriptor, 1, hdroffset, | |
1000 | match_uuid, base_address, skip_symtab, | |
1001 | nfat_arch, error_callback, data, | |
1002 | fileline_fn, found_sym); | |
1003 | } | |
1004 | default: | |
1005 | error_callback (data, "executable file is not in Mach-O format", 0); | |
1006 | goto fail; | |
ea8adc8c | 1007 | } |
ea8adc8c | 1008 | |
ba9703b0 | 1009 | switch (header.filetype) |
ea8adc8c | 1010 | { |
ba9703b0 XL |
1011 | case MACH_O_MH_EXECUTE: |
1012 | case MACH_O_MH_DYLIB: | |
1013 | case MACH_O_MH_DSYM: | |
1014 | break; | |
1015 | default: | |
1016 | error_callback (data, "executable file is not an executable", 0); | |
1017 | goto fail; | |
ea8adc8c XL |
1018 | } |
1019 | ||
ba9703b0 XL |
1020 | if (!backtrace_get_view (state, descriptor, hdroffset, header.sizeofcmds, |
1021 | error_callback, data, &cmds_view)) | |
1022 | goto fail; | |
1023 | cmds_view_valid = 1; | |
ea8adc8c | 1024 | |
ba9703b0 XL |
1025 | memset (&dwarf_sections, 0, sizeof dwarf_sections); |
1026 | have_dwarf = 0; | |
1027 | memset (&uuid, 0, sizeof uuid); | |
1028 | have_uuid = 0; | |
ea8adc8c | 1029 | |
ba9703b0 XL |
1030 | cmdoffset = 0; |
1031 | for (i = 0; i < header.ncmds; ++i) | |
ea8adc8c | 1032 | { |
ba9703b0 XL |
1033 | const char *pcmd; |
1034 | struct macho_load_command load_command; | |
1035 | ||
1036 | if (cmdoffset + sizeof load_command > header.sizeofcmds) | |
1037 | break; | |
1038 | ||
1039 | pcmd = (const char *) cmds_view.data + cmdoffset; | |
1040 | memcpy (&load_command, pcmd, sizeof load_command); | |
1041 | ||
1042 | switch (load_command.cmd) | |
1043 | { | |
1044 | case MACH_O_LC_SEGMENT: | |
1045 | { | |
1046 | struct macho_segment_command segcmd; | |
1047 | ||
1048 | memcpy (&segcmd, pcmd, sizeof segcmd); | |
1049 | if (memcmp (segcmd.segname, | |
1050 | "__DWARF\0\0\0\0\0\0\0\0\0", | |
1051 | MACH_O_NAMELEN) == 0) | |
1052 | { | |
1053 | if (!macho_add_dwarf_segment (state, descriptor, offset, | |
1054 | load_command.cmd, | |
1055 | pcmd + sizeof segcmd, | |
1056 | (load_command.cmdsize | |
1057 | - sizeof segcmd), | |
1058 | segcmd.nsects, error_callback, | |
1059 | data, &dwarf_sections)) | |
1060 | goto fail; | |
1061 | have_dwarf = 1; | |
1062 | } | |
1063 | } | |
1064 | break; | |
1065 | ||
1066 | case MACH_O_LC_SEGMENT_64: | |
1067 | { | |
1068 | struct macho_segment_64_command segcmd; | |
1069 | ||
1070 | memcpy (&segcmd, pcmd, sizeof segcmd); | |
1071 | if (memcmp (segcmd.segname, | |
1072 | "__DWARF\0\0\0\0\0\0\0\0\0", | |
1073 | MACH_O_NAMELEN) == 0) | |
1074 | { | |
1075 | if (!macho_add_dwarf_segment (state, descriptor, offset, | |
1076 | load_command.cmd, | |
1077 | pcmd + sizeof segcmd, | |
1078 | (load_command.cmdsize | |
1079 | - sizeof segcmd), | |
1080 | segcmd.nsects, error_callback, | |
1081 | data, &dwarf_sections)) | |
1082 | goto fail; | |
1083 | have_dwarf = 1; | |
1084 | } | |
1085 | } | |
1086 | break; | |
1087 | ||
1088 | case MACH_O_LC_SYMTAB: | |
1089 | if (!skip_symtab) | |
1090 | { | |
1091 | struct macho_symtab_command symcmd; | |
1092 | ||
1093 | memcpy (&symcmd, pcmd, sizeof symcmd); | |
1094 | if (!macho_add_symtab (state, descriptor, base_address, is_64, | |
1095 | offset + symcmd.symoff, symcmd.nsyms, | |
1096 | offset + symcmd.stroff, symcmd.strsize, | |
1097 | error_callback, data)) | |
1098 | goto fail; | |
1099 | ||
1100 | *found_sym = 1; | |
1101 | } | |
1102 | break; | |
1103 | ||
1104 | case MACH_O_LC_UUID: | |
1105 | { | |
1106 | struct macho_uuid_command uuidcmd; | |
1107 | ||
1108 | memcpy (&uuidcmd, pcmd, sizeof uuidcmd); | |
1109 | memcpy (&uuid[0], &uuidcmd.uuid[0], MACH_O_UUID_LEN); | |
1110 | have_uuid = 1; | |
1111 | } | |
1112 | break; | |
1113 | ||
1114 | default: | |
1115 | break; | |
1116 | } | |
1117 | ||
1118 | cmdoffset += load_command.cmdsize; | |
ea8adc8c XL |
1119 | } |
1120 | ||
ba9703b0 XL |
1121 | if (!backtrace_close (descriptor, error_callback, data)) |
1122 | goto fail; | |
1123 | descriptor = -1; | |
1124 | ||
1125 | backtrace_release_view (state, &cmds_view, error_callback, data); | |
1126 | cmds_view_valid = 0; | |
1127 | ||
1128 | if (match_uuid != NULL) | |
ea8adc8c | 1129 | { |
ba9703b0 XL |
1130 | /* If we don't have a UUID, or it doesn't match, just ignore |
1131 | this file. */ | |
1132 | if (!have_uuid | |
1133 | || memcmp (match_uuid, &uuid[0], MACH_O_UUID_LEN) != 0) | |
1134 | return 1; | |
ea8adc8c XL |
1135 | } |
1136 | ||
ba9703b0 | 1137 | if (have_dwarf) |
ea8adc8c | 1138 | { |
ba9703b0 XL |
1139 | int is_big_endian; |
1140 | ||
1141 | is_big_endian = 0; | |
1142 | #if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) | |
1143 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
1144 | is_big_endian = 1; | |
1145 | #endif | |
1146 | #endif | |
1147 | ||
1148 | if (!backtrace_dwarf_add (state, base_address, &dwarf_sections, | |
1149 | is_big_endian, NULL, error_callback, data, | |
1150 | fileline_fn, NULL)) | |
1151 | goto fail; | |
ea8adc8c | 1152 | } |
ea8adc8c | 1153 | |
ba9703b0 | 1154 | if (!have_dwarf && have_uuid) |
ea8adc8c | 1155 | { |
ba9703b0 XL |
1156 | if (!macho_add_dsym (state, filename, base_address, &uuid[0], |
1157 | error_callback, data, fileline_fn)) | |
1158 | goto fail; | |
ea8adc8c XL |
1159 | } |
1160 | ||
ba9703b0 XL |
1161 | return 1; |
1162 | ||
1163 | fail: | |
1164 | if (cmds_view_valid) | |
1165 | backtrace_release_view (state, &cmds_view, error_callback, data); | |
1166 | if (descriptor != -1) | |
1167 | backtrace_close (descriptor, error_callback, data); | |
1168 | return 0; | |
ea8adc8c XL |
1169 | } |
1170 | ||
ba9703b0 | 1171 | #ifdef HAVE_MACH_O_DYLD_H |
ea8adc8c | 1172 | |
ba9703b0 XL |
1173 | /* Initialize the backtrace data we need from a Mach-O executable |
1174 | using the dyld support functions. This closes descriptor. */ | |
ea8adc8c | 1175 | |
ba9703b0 XL |
1176 | int |
1177 | backtrace_initialize (struct backtrace_state *state, const char *filename, | |
1178 | int descriptor, backtrace_error_callback error_callback, | |
1179 | void *data, fileline *fileline_fn) | |
ea8adc8c | 1180 | { |
ba9703b0 XL |
1181 | uint32_t c; |
1182 | uint32_t i; | |
1183 | int closed_descriptor; | |
1184 | int found_sym; | |
1185 | fileline macho_fileline_fn; | |
1186 | ||
1187 | closed_descriptor = 0; | |
1188 | found_sym = 0; | |
1189 | macho_fileline_fn = macho_nodebug; | |
1190 | ||
1191 | c = _dyld_image_count (); | |
1192 | for (i = 0; i < c; ++i) | |
1193 | { | |
1194 | uintptr_t base_address; | |
1195 | const char *name; | |
1196 | int d; | |
1197 | fileline mff; | |
1198 | int mfs; | |
1199 | ||
1200 | name = _dyld_get_image_name (i); | |
1201 | if (name == NULL) | |
1202 | continue; | |
1203 | ||
1204 | if (strcmp (name, filename) == 0 && !closed_descriptor) | |
1205 | { | |
1206 | d = descriptor; | |
1207 | closed_descriptor = 1; | |
1208 | } | |
1209 | else | |
1210 | { | |
1211 | int does_not_exist; | |
1212 | ||
1213 | d = backtrace_open (name, error_callback, data, &does_not_exist); | |
1214 | if (d < 0) | |
1215 | continue; | |
1216 | } | |
1217 | ||
1218 | base_address = _dyld_get_image_vmaddr_slide (i); | |
1219 | ||
1220 | mff = macho_nodebug; | |
1221 | if (!macho_add (state, name, d, 0, NULL, base_address, 0, | |
1222 | error_callback, data, &mff, &mfs)) | |
1223 | return 0; | |
1224 | ||
1225 | if (mff != macho_nodebug) | |
1226 | macho_fileline_fn = mff; | |
1227 | if (mfs) | |
1228 | found_sym = 1; | |
1229 | } | |
1230 | ||
1231 | if (!closed_descriptor) | |
1232 | backtrace_close (descriptor, error_callback, data); | |
ea8adc8c XL |
1233 | |
1234 | if (!state->threaded) | |
1235 | { | |
ba9703b0 XL |
1236 | if (found_sym) |
1237 | state->syminfo_fn = macho_syminfo; | |
1238 | else if (state->syminfo_fn == NULL) | |
1239 | state->syminfo_fn = macho_nosyms; | |
ea8adc8c XL |
1240 | } |
1241 | else | |
1242 | { | |
ba9703b0 XL |
1243 | if (found_sym) |
1244 | backtrace_atomic_store_pointer (&state->syminfo_fn, macho_syminfo); | |
1245 | else | |
1246 | (void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL, | |
1247 | macho_nosyms); | |
ea8adc8c XL |
1248 | } |
1249 | ||
ba9703b0 XL |
1250 | if (!state->threaded) |
1251 | *fileline_fn = state->fileline_fn; | |
ea8adc8c | 1252 | else |
ba9703b0 | 1253 | *fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn); |
ea8adc8c | 1254 | |
ba9703b0 XL |
1255 | if (*fileline_fn == NULL || *fileline_fn == macho_nodebug) |
1256 | *fileline_fn = macho_fileline_fn; | |
ea8adc8c | 1257 | |
ba9703b0 | 1258 | return 1; |
ea8adc8c XL |
1259 | } |
1260 | ||
ba9703b0 XL |
1261 | #else /* !defined (HAVE_MACH_O_DYLD_H) */ |
1262 | ||
1263 | /* Initialize the backtrace data we need from a Mach-O executable | |
1264 | without using the dyld support functions. This closes | |
1265 | descriptor. */ | |
ea8adc8c XL |
1266 | |
1267 | int | |
ba9703b0 XL |
1268 | backtrace_initialize (struct backtrace_state *state, const char *filename, |
1269 | int descriptor, backtrace_error_callback error_callback, | |
1270 | void *data, fileline *fileline_fn) | |
ea8adc8c | 1271 | { |
ba9703b0 XL |
1272 | fileline macho_fileline_fn; |
1273 | int found_sym; | |
1274 | ||
1275 | macho_fileline_fn = macho_nodebug; | |
1276 | if (!macho_add (state, filename, descriptor, 0, NULL, 0, 0, | |
1277 | error_callback, data, &macho_fileline_fn, &found_sym)) | |
1278 | return 0; | |
ea8adc8c XL |
1279 | |
1280 | if (!state->threaded) | |
1281 | { | |
1282 | if (found_sym) | |
ba9703b0 | 1283 | state->syminfo_fn = macho_syminfo; |
ea8adc8c | 1284 | else if (state->syminfo_fn == NULL) |
ba9703b0 | 1285 | state->syminfo_fn = macho_nosyms; |
ea8adc8c XL |
1286 | } |
1287 | else | |
1288 | { | |
1289 | if (found_sym) | |
ba9703b0 | 1290 | backtrace_atomic_store_pointer (&state->syminfo_fn, macho_syminfo); |
ea8adc8c | 1291 | else |
ba9703b0 XL |
1292 | (void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL, |
1293 | macho_nosyms); | |
ea8adc8c XL |
1294 | } |
1295 | ||
1296 | if (!state->threaded) | |
ba9703b0 | 1297 | *fileline_fn = state->fileline_fn; |
ea8adc8c | 1298 | else |
ba9703b0 | 1299 | *fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn); |
ea8adc8c | 1300 | |
ba9703b0 XL |
1301 | if (*fileline_fn == NULL || *fileline_fn == macho_nodebug) |
1302 | *fileline_fn = macho_fileline_fn; | |
ea8adc8c XL |
1303 | |
1304 | return 1; | |
1305 | } | |
1306 | ||
ba9703b0 | 1307 | #endif /* !defined (HAVE_MACH_O_DYLD_H) */ |