Root/
1 | #include <dirent.h> |
2 | #include <errno.h> |
3 | #include <stdlib.h> |
4 | #include <stdio.h> |
5 | #include <string.h> |
6 | #include <sys/types.h> |
7 | #include <sys/stat.h> |
8 | #include <sys/param.h> |
9 | #include <fcntl.h> |
10 | #include <unistd.h> |
11 | #include <inttypes.h> |
12 | #include "build-id.h" |
13 | #include "util.h" |
14 | #include "debug.h" |
15 | #include "symbol.h" |
16 | #include "strlist.h" |
17 | |
18 | #include <libelf.h> |
19 | #include <gelf.h> |
20 | #include <elf.h> |
21 | #include <limits.h> |
22 | #include <sys/utsname.h> |
23 | |
24 | #ifndef KSYM_NAME_LEN |
25 | #define KSYM_NAME_LEN 256 |
26 | #endif |
27 | |
28 | #ifndef NT_GNU_BUILD_ID |
29 | #define NT_GNU_BUILD_ID 3 |
30 | #endif |
31 | |
32 | static bool dso__build_id_equal(const struct dso *dso, u8 *build_id); |
33 | static int elf_read_build_id(Elf *elf, void *bf, size_t size); |
34 | static void dsos__add(struct list_head *head, struct dso *dso); |
35 | static struct map *map__new2(u64 start, struct dso *dso, enum map_type type); |
36 | static int dso__load_kernel_sym(struct dso *dso, struct map *map, |
37 | symbol_filter_t filter); |
38 | static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, |
39 | symbol_filter_t filter); |
40 | static int vmlinux_path__nr_entries; |
41 | static char **vmlinux_path; |
42 | |
43 | struct symbol_conf symbol_conf = { |
44 | .exclude_other = true, |
45 | .use_modules = true, |
46 | .try_vmlinux_path = true, |
47 | .annotate_src = true, |
48 | .symfs = "", |
49 | }; |
50 | |
51 | int dso__name_len(const struct dso *dso) |
52 | { |
53 | if (!dso) |
54 | return strlen("[unknown]"); |
55 | if (verbose) |
56 | return dso->long_name_len; |
57 | |
58 | return dso->short_name_len; |
59 | } |
60 | |
61 | bool dso__loaded(const struct dso *dso, enum map_type type) |
62 | { |
63 | return dso->loaded & (1 << type); |
64 | } |
65 | |
66 | bool dso__sorted_by_name(const struct dso *dso, enum map_type type) |
67 | { |
68 | return dso->sorted_by_name & (1 << type); |
69 | } |
70 | |
71 | static void dso__set_sorted_by_name(struct dso *dso, enum map_type type) |
72 | { |
73 | dso->sorted_by_name |= (1 << type); |
74 | } |
75 | |
76 | bool symbol_type__is_a(char symbol_type, enum map_type map_type) |
77 | { |
78 | symbol_type = toupper(symbol_type); |
79 | |
80 | switch (map_type) { |
81 | case MAP__FUNCTION: |
82 | return symbol_type == 'T' || symbol_type == 'W'; |
83 | case MAP__VARIABLE: |
84 | return symbol_type == 'D'; |
85 | default: |
86 | return false; |
87 | } |
88 | } |
89 | |
90 | static int prefix_underscores_count(const char *str) |
91 | { |
92 | const char *tail = str; |
93 | |
94 | while (*tail == '_') |
95 | tail++; |
96 | |
97 | return tail - str; |
98 | } |
99 | |
100 | #define SYMBOL_A 0 |
101 | #define SYMBOL_B 1 |
102 | |
103 | static int choose_best_symbol(struct symbol *syma, struct symbol *symb) |
104 | { |
105 | s64 a; |
106 | s64 b; |
107 | |
108 | /* Prefer a symbol with non zero length */ |
109 | a = syma->end - syma->start; |
110 | b = symb->end - symb->start; |
111 | if ((b == 0) && (a > 0)) |
112 | return SYMBOL_A; |
113 | else if ((a == 0) && (b > 0)) |
114 | return SYMBOL_B; |
115 | |
116 | /* Prefer a non weak symbol over a weak one */ |
117 | a = syma->binding == STB_WEAK; |
118 | b = symb->binding == STB_WEAK; |
119 | if (b && !a) |
120 | return SYMBOL_A; |
121 | if (a && !b) |
122 | return SYMBOL_B; |
123 | |
124 | /* Prefer a global symbol over a non global one */ |
125 | a = syma->binding == STB_GLOBAL; |
126 | b = symb->binding == STB_GLOBAL; |
127 | if (a && !b) |
128 | return SYMBOL_A; |
129 | if (b && !a) |
130 | return SYMBOL_B; |
131 | |
132 | /* Prefer a symbol with less underscores */ |
133 | a = prefix_underscores_count(syma->name); |
134 | b = prefix_underscores_count(symb->name); |
135 | if (b > a) |
136 | return SYMBOL_A; |
137 | else if (a > b) |
138 | return SYMBOL_B; |
139 | |
140 | /* If all else fails, choose the symbol with the longest name */ |
141 | if (strlen(syma->name) >= strlen(symb->name)) |
142 | return SYMBOL_A; |
143 | else |
144 | return SYMBOL_B; |
145 | } |
146 | |
147 | static void symbols__fixup_duplicate(struct rb_root *symbols) |
148 | { |
149 | struct rb_node *nd; |
150 | struct symbol *curr, *next; |
151 | |
152 | nd = rb_first(symbols); |
153 | |
154 | while (nd) { |
155 | curr = rb_entry(nd, struct symbol, rb_node); |
156 | again: |
157 | nd = rb_next(&curr->rb_node); |
158 | next = rb_entry(nd, struct symbol, rb_node); |
159 | |
160 | if (!nd) |
161 | break; |
162 | |
163 | if (curr->start != next->start) |
164 | continue; |
165 | |
166 | if (choose_best_symbol(curr, next) == SYMBOL_A) { |
167 | rb_erase(&next->rb_node, symbols); |
168 | goto again; |
169 | } else { |
170 | nd = rb_next(&curr->rb_node); |
171 | rb_erase(&curr->rb_node, symbols); |
172 | } |
173 | } |
174 | } |
175 | |
176 | static void symbols__fixup_end(struct rb_root *symbols) |
177 | { |
178 | struct rb_node *nd, *prevnd = rb_first(symbols); |
179 | struct symbol *curr, *prev; |
180 | |
181 | if (prevnd == NULL) |
182 | return; |
183 | |
184 | curr = rb_entry(prevnd, struct symbol, rb_node); |
185 | |
186 | for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { |
187 | prev = curr; |
188 | curr = rb_entry(nd, struct symbol, rb_node); |
189 | |
190 | if (prev->end == prev->start && prev->end != curr->start) |
191 | prev->end = curr->start - 1; |
192 | } |
193 | |
194 | /* Last entry */ |
195 | if (curr->end == curr->start) |
196 | curr->end = roundup(curr->start, 4096); |
197 | } |
198 | |
199 | static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) |
200 | { |
201 | struct map *prev, *curr; |
202 | struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]); |
203 | |
204 | if (prevnd == NULL) |
205 | return; |
206 | |
207 | curr = rb_entry(prevnd, struct map, rb_node); |
208 | |
209 | for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { |
210 | prev = curr; |
211 | curr = rb_entry(nd, struct map, rb_node); |
212 | prev->end = curr->start - 1; |
213 | } |
214 | |
215 | /* |
216 | * We still haven't the actual symbols, so guess the |
217 | * last map final address. |
218 | */ |
219 | curr->end = ~0ULL; |
220 | } |
221 | |
222 | static void map_groups__fixup_end(struct map_groups *mg) |
223 | { |
224 | int i; |
225 | for (i = 0; i < MAP__NR_TYPES; ++i) |
226 | __map_groups__fixup_end(mg, i); |
227 | } |
228 | |
229 | static struct symbol *symbol__new(u64 start, u64 len, u8 binding, |
230 | const char *name) |
231 | { |
232 | size_t namelen = strlen(name) + 1; |
233 | struct symbol *sym = calloc(1, (symbol_conf.priv_size + |
234 | sizeof(*sym) + namelen)); |
235 | if (sym == NULL) |
236 | return NULL; |
237 | |
238 | if (symbol_conf.priv_size) |
239 | sym = ((void *)sym) + symbol_conf.priv_size; |
240 | |
241 | sym->start = start; |
242 | sym->end = len ? start + len - 1 : start; |
243 | sym->binding = binding; |
244 | sym->namelen = namelen - 1; |
245 | |
246 | pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", |
247 | __func__, name, start, sym->end); |
248 | memcpy(sym->name, name, namelen); |
249 | |
250 | return sym; |
251 | } |
252 | |
253 | void symbol__delete(struct symbol *sym) |
254 | { |
255 | free(((void *)sym) - symbol_conf.priv_size); |
256 | } |
257 | |
258 | static size_t symbol__fprintf(struct symbol *sym, FILE *fp) |
259 | { |
260 | return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n", |
261 | sym->start, sym->end, |
262 | sym->binding == STB_GLOBAL ? 'g' : |
263 | sym->binding == STB_LOCAL ? 'l' : 'w', |
264 | sym->name); |
265 | } |
266 | |
267 | size_t symbol__fprintf_symname_offs(const struct symbol *sym, |
268 | const struct addr_location *al, FILE *fp) |
269 | { |
270 | unsigned long offset; |
271 | size_t length; |
272 | |
273 | if (sym && sym->name) { |
274 | length = fprintf(fp, "%s", sym->name); |
275 | if (al) { |
276 | offset = al->addr - sym->start; |
277 | length += fprintf(fp, "+0x%lx", offset); |
278 | } |
279 | return length; |
280 | } else |
281 | return fprintf(fp, "[unknown]"); |
282 | } |
283 | |
284 | size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp) |
285 | { |
286 | return symbol__fprintf_symname_offs(sym, NULL, fp); |
287 | } |
288 | |
289 | void dso__set_long_name(struct dso *dso, char *name) |
290 | { |
291 | if (name == NULL) |
292 | return; |
293 | dso->long_name = name; |
294 | dso->long_name_len = strlen(name); |
295 | } |
296 | |
297 | static void dso__set_short_name(struct dso *dso, const char *name) |
298 | { |
299 | if (name == NULL) |
300 | return; |
301 | dso->short_name = name; |
302 | dso->short_name_len = strlen(name); |
303 | } |
304 | |
305 | static void dso__set_basename(struct dso *dso) |
306 | { |
307 | dso__set_short_name(dso, basename(dso->long_name)); |
308 | } |
309 | |
310 | struct dso *dso__new(const char *name) |
311 | { |
312 | struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1); |
313 | |
314 | if (dso != NULL) { |
315 | int i; |
316 | strcpy(dso->name, name); |
317 | dso__set_long_name(dso, dso->name); |
318 | dso__set_short_name(dso, dso->name); |
319 | for (i = 0; i < MAP__NR_TYPES; ++i) |
320 | dso->symbols[i] = dso->symbol_names[i] = RB_ROOT; |
321 | dso->symtab_type = SYMTAB__NOT_FOUND; |
322 | dso->loaded = 0; |
323 | dso->sorted_by_name = 0; |
324 | dso->has_build_id = 0; |
325 | dso->kernel = DSO_TYPE_USER; |
326 | dso->needs_swap = DSO_SWAP__UNSET; |
327 | INIT_LIST_HEAD(&dso->node); |
328 | } |
329 | |
330 | return dso; |
331 | } |
332 | |
333 | static void symbols__delete(struct rb_root *symbols) |
334 | { |
335 | struct symbol *pos; |
336 | struct rb_node *next = rb_first(symbols); |
337 | |
338 | while (next) { |
339 | pos = rb_entry(next, struct symbol, rb_node); |
340 | next = rb_next(&pos->rb_node); |
341 | rb_erase(&pos->rb_node, symbols); |
342 | symbol__delete(pos); |
343 | } |
344 | } |
345 | |
346 | void dso__delete(struct dso *dso) |
347 | { |
348 | int i; |
349 | for (i = 0; i < MAP__NR_TYPES; ++i) |
350 | symbols__delete(&dso->symbols[i]); |
351 | if (dso->sname_alloc) |
352 | free((char *)dso->short_name); |
353 | if (dso->lname_alloc) |
354 | free(dso->long_name); |
355 | free(dso); |
356 | } |
357 | |
358 | void dso__set_build_id(struct dso *dso, void *build_id) |
359 | { |
360 | memcpy(dso->build_id, build_id, sizeof(dso->build_id)); |
361 | dso->has_build_id = 1; |
362 | } |
363 | |
364 | static void symbols__insert(struct rb_root *symbols, struct symbol *sym) |
365 | { |
366 | struct rb_node **p = &symbols->rb_node; |
367 | struct rb_node *parent = NULL; |
368 | const u64 ip = sym->start; |
369 | struct symbol *s; |
370 | |
371 | while (*p != NULL) { |
372 | parent = *p; |
373 | s = rb_entry(parent, struct symbol, rb_node); |
374 | if (ip < s->start) |
375 | p = &(*p)->rb_left; |
376 | else |
377 | p = &(*p)->rb_right; |
378 | } |
379 | rb_link_node(&sym->rb_node, parent, p); |
380 | rb_insert_color(&sym->rb_node, symbols); |
381 | } |
382 | |
383 | static struct symbol *symbols__find(struct rb_root *symbols, u64 ip) |
384 | { |
385 | struct rb_node *n; |
386 | |
387 | if (symbols == NULL) |
388 | return NULL; |
389 | |
390 | n = symbols->rb_node; |
391 | |
392 | while (n) { |
393 | struct symbol *s = rb_entry(n, struct symbol, rb_node); |
394 | |
395 | if (ip < s->start) |
396 | n = n->rb_left; |
397 | else if (ip > s->end) |
398 | n = n->rb_right; |
399 | else |
400 | return s; |
401 | } |
402 | |
403 | return NULL; |
404 | } |
405 | |
406 | struct symbol_name_rb_node { |
407 | struct rb_node rb_node; |
408 | struct symbol sym; |
409 | }; |
410 | |
411 | static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym) |
412 | { |
413 | struct rb_node **p = &symbols->rb_node; |
414 | struct rb_node *parent = NULL; |
415 | struct symbol_name_rb_node *symn, *s; |
416 | |
417 | symn = container_of(sym, struct symbol_name_rb_node, sym); |
418 | |
419 | while (*p != NULL) { |
420 | parent = *p; |
421 | s = rb_entry(parent, struct symbol_name_rb_node, rb_node); |
422 | if (strcmp(sym->name, s->sym.name) < 0) |
423 | p = &(*p)->rb_left; |
424 | else |
425 | p = &(*p)->rb_right; |
426 | } |
427 | rb_link_node(&symn->rb_node, parent, p); |
428 | rb_insert_color(&symn->rb_node, symbols); |
429 | } |
430 | |
431 | static void symbols__sort_by_name(struct rb_root *symbols, |
432 | struct rb_root *source) |
433 | { |
434 | struct rb_node *nd; |
435 | |
436 | for (nd = rb_first(source); nd; nd = rb_next(nd)) { |
437 | struct symbol *pos = rb_entry(nd, struct symbol, rb_node); |
438 | symbols__insert_by_name(symbols, pos); |
439 | } |
440 | } |
441 | |
442 | static struct symbol *symbols__find_by_name(struct rb_root *symbols, |
443 | const char *name) |
444 | { |
445 | struct rb_node *n; |
446 | |
447 | if (symbols == NULL) |
448 | return NULL; |
449 | |
450 | n = symbols->rb_node; |
451 | |
452 | while (n) { |
453 | struct symbol_name_rb_node *s; |
454 | int cmp; |
455 | |
456 | s = rb_entry(n, struct symbol_name_rb_node, rb_node); |
457 | cmp = strcmp(name, s->sym.name); |
458 | |
459 | if (cmp < 0) |
460 | n = n->rb_left; |
461 | else if (cmp > 0) |
462 | n = n->rb_right; |
463 | else |
464 | return &s->sym; |
465 | } |
466 | |
467 | return NULL; |
468 | } |
469 | |
470 | struct symbol *dso__find_symbol(struct dso *dso, |
471 | enum map_type type, u64 addr) |
472 | { |
473 | return symbols__find(&dso->symbols[type], addr); |
474 | } |
475 | |
476 | struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type, |
477 | const char *name) |
478 | { |
479 | return symbols__find_by_name(&dso->symbol_names[type], name); |
480 | } |
481 | |
482 | void dso__sort_by_name(struct dso *dso, enum map_type type) |
483 | { |
484 | dso__set_sorted_by_name(dso, type); |
485 | return symbols__sort_by_name(&dso->symbol_names[type], |
486 | &dso->symbols[type]); |
487 | } |
488 | |
489 | int build_id__sprintf(const u8 *build_id, int len, char *bf) |
490 | { |
491 | char *bid = bf; |
492 | const u8 *raw = build_id; |
493 | int i; |
494 | |
495 | for (i = 0; i < len; ++i) { |
496 | sprintf(bid, "%02x", *raw); |
497 | ++raw; |
498 | bid += 2; |
499 | } |
500 | |
501 | return raw - build_id; |
502 | } |
503 | |
504 | size_t dso__fprintf_buildid(struct dso *dso, FILE *fp) |
505 | { |
506 | char sbuild_id[BUILD_ID_SIZE * 2 + 1]; |
507 | |
508 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
509 | return fprintf(fp, "%s", sbuild_id); |
510 | } |
511 | |
512 | size_t dso__fprintf_symbols_by_name(struct dso *dso, |
513 | enum map_type type, FILE *fp) |
514 | { |
515 | size_t ret = 0; |
516 | struct rb_node *nd; |
517 | struct symbol_name_rb_node *pos; |
518 | |
519 | for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) { |
520 | pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); |
521 | fprintf(fp, "%s\n", pos->sym.name); |
522 | } |
523 | |
524 | return ret; |
525 | } |
526 | |
527 | size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp) |
528 | { |
529 | struct rb_node *nd; |
530 | size_t ret = fprintf(fp, "dso: %s (", dso->short_name); |
531 | |
532 | if (dso->short_name != dso->long_name) |
533 | ret += fprintf(fp, "%s, ", dso->long_name); |
534 | ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type], |
535 | dso->loaded ? "" : "NOT "); |
536 | ret += dso__fprintf_buildid(dso, fp); |
537 | ret += fprintf(fp, ")\n"); |
538 | for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) { |
539 | struct symbol *pos = rb_entry(nd, struct symbol, rb_node); |
540 | ret += symbol__fprintf(pos, fp); |
541 | } |
542 | |
543 | return ret; |
544 | } |
545 | |
546 | int kallsyms__parse(const char *filename, void *arg, |
547 | int (*process_symbol)(void *arg, const char *name, |
548 | char type, u64 start, u64 end)) |
549 | { |
550 | char *line = NULL; |
551 | size_t n; |
552 | int err = -1; |
553 | FILE *file = fopen(filename, "r"); |
554 | |
555 | if (file == NULL) |
556 | goto out_failure; |
557 | |
558 | err = 0; |
559 | |
560 | while (!feof(file)) { |
561 | u64 start; |
562 | int line_len, len; |
563 | char symbol_type; |
564 | char *symbol_name; |
565 | |
566 | line_len = getline(&line, &n, file); |
567 | if (line_len < 0 || !line) |
568 | break; |
569 | |
570 | line[--line_len] = '\0'; /* \n */ |
571 | |
572 | len = hex2u64(line, &start); |
573 | |
574 | len++; |
575 | if (len + 2 >= line_len) |
576 | continue; |
577 | |
578 | symbol_type = line[len]; |
579 | len += 2; |
580 | symbol_name = line + len; |
581 | len = line_len - len; |
582 | |
583 | if (len >= KSYM_NAME_LEN) { |
584 | err = -1; |
585 | break; |
586 | } |
587 | |
588 | /* |
589 | * module symbols are not sorted so we add all |
590 | * symbols with zero length and rely on |
591 | * symbols__fixup_end() to fix it up. |
592 | */ |
593 | err = process_symbol(arg, symbol_name, |
594 | symbol_type, start, start); |
595 | if (err) |
596 | break; |
597 | } |
598 | |
599 | free(line); |
600 | fclose(file); |
601 | return err; |
602 | |
603 | out_failure: |
604 | return -1; |
605 | } |
606 | |
607 | struct process_kallsyms_args { |
608 | struct map *map; |
609 | struct dso *dso; |
610 | }; |
611 | |
612 | static u8 kallsyms2elf_type(char type) |
613 | { |
614 | if (type == 'W') |
615 | return STB_WEAK; |
616 | |
617 | return isupper(type) ? STB_GLOBAL : STB_LOCAL; |
618 | } |
619 | |
620 | static int map__process_kallsym_symbol(void *arg, const char *name, |
621 | char type, u64 start, u64 end) |
622 | { |
623 | struct symbol *sym; |
624 | struct process_kallsyms_args *a = arg; |
625 | struct rb_root *root = &a->dso->symbols[a->map->type]; |
626 | |
627 | if (!symbol_type__is_a(type, a->map->type)) |
628 | return 0; |
629 | |
630 | sym = symbol__new(start, end - start + 1, |
631 | kallsyms2elf_type(type), name); |
632 | if (sym == NULL) |
633 | return -ENOMEM; |
634 | /* |
635 | * We will pass the symbols to the filter later, in |
636 | * map__split_kallsyms, when we have split the maps per module |
637 | */ |
638 | symbols__insert(root, sym); |
639 | |
640 | return 0; |
641 | } |
642 | |
643 | /* |
644 | * Loads the function entries in /proc/kallsyms into kernel_map->dso, |
645 | * so that we can in the next step set the symbol ->end address and then |
646 | * call kernel_maps__split_kallsyms. |
647 | */ |
648 | static int dso__load_all_kallsyms(struct dso *dso, const char *filename, |
649 | struct map *map) |
650 | { |
651 | struct process_kallsyms_args args = { .map = map, .dso = dso, }; |
652 | return kallsyms__parse(filename, &args, map__process_kallsym_symbol); |
653 | } |
654 | |
655 | /* |
656 | * Split the symbols into maps, making sure there are no overlaps, i.e. the |
657 | * kernel range is broken in several maps, named [kernel].N, as we don't have |
658 | * the original ELF section names vmlinux have. |
659 | */ |
660 | static int dso__split_kallsyms(struct dso *dso, struct map *map, |
661 | symbol_filter_t filter) |
662 | { |
663 | struct map_groups *kmaps = map__kmap(map)->kmaps; |
664 | struct machine *machine = kmaps->machine; |
665 | struct map *curr_map = map; |
666 | struct symbol *pos; |
667 | int count = 0, moved = 0; |
668 | struct rb_root *root = &dso->symbols[map->type]; |
669 | struct rb_node *next = rb_first(root); |
670 | int kernel_range = 0; |
671 | |
672 | while (next) { |
673 | char *module; |
674 | |
675 | pos = rb_entry(next, struct symbol, rb_node); |
676 | next = rb_next(&pos->rb_node); |
677 | |
678 | module = strchr(pos->name, '\t'); |
679 | if (module) { |
680 | if (!symbol_conf.use_modules) |
681 | goto discard_symbol; |
682 | |
683 | *module++ = '\0'; |
684 | |
685 | if (strcmp(curr_map->dso->short_name, module)) { |
686 | if (curr_map != map && |
687 | dso->kernel == DSO_TYPE_GUEST_KERNEL && |
688 | machine__is_default_guest(machine)) { |
689 | /* |
690 | * We assume all symbols of a module are |
691 | * continuous in * kallsyms, so curr_map |
692 | * points to a module and all its |
693 | * symbols are in its kmap. Mark it as |
694 | * loaded. |
695 | */ |
696 | dso__set_loaded(curr_map->dso, |
697 | curr_map->type); |
698 | } |
699 | |
700 | curr_map = map_groups__find_by_name(kmaps, |
701 | map->type, module); |
702 | if (curr_map == NULL) { |
703 | pr_debug("%s/proc/{kallsyms,modules} " |
704 | "inconsistency while looking " |
705 | "for \"%s\" module!\n", |
706 | machine->root_dir, module); |
707 | curr_map = map; |
708 | goto discard_symbol; |
709 | } |
710 | |
711 | if (curr_map->dso->loaded && |
712 | !machine__is_default_guest(machine)) |
713 | goto discard_symbol; |
714 | } |
715 | /* |
716 | * So that we look just like we get from .ko files, |
717 | * i.e. not prelinked, relative to map->start. |
718 | */ |
719 | pos->start = curr_map->map_ip(curr_map, pos->start); |
720 | pos->end = curr_map->map_ip(curr_map, pos->end); |
721 | } else if (curr_map != map) { |
722 | char dso_name[PATH_MAX]; |
723 | struct dso *ndso; |
724 | |
725 | if (count == 0) { |
726 | curr_map = map; |
727 | goto filter_symbol; |
728 | } |
729 | |
730 | if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
731 | snprintf(dso_name, sizeof(dso_name), |
732 | "[guest.kernel].%d", |
733 | kernel_range++); |
734 | else |
735 | snprintf(dso_name, sizeof(dso_name), |
736 | "[kernel].%d", |
737 | kernel_range++); |
738 | |
739 | ndso = dso__new(dso_name); |
740 | if (ndso == NULL) |
741 | return -1; |
742 | |
743 | ndso->kernel = dso->kernel; |
744 | |
745 | curr_map = map__new2(pos->start, ndso, map->type); |
746 | if (curr_map == NULL) { |
747 | dso__delete(ndso); |
748 | return -1; |
749 | } |
750 | |
751 | curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; |
752 | map_groups__insert(kmaps, curr_map); |
753 | ++kernel_range; |
754 | } |
755 | filter_symbol: |
756 | if (filter && filter(curr_map, pos)) { |
757 | discard_symbol: rb_erase(&pos->rb_node, root); |
758 | symbol__delete(pos); |
759 | } else { |
760 | if (curr_map != map) { |
761 | rb_erase(&pos->rb_node, root); |
762 | symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); |
763 | ++moved; |
764 | } else |
765 | ++count; |
766 | } |
767 | } |
768 | |
769 | if (curr_map != map && |
770 | dso->kernel == DSO_TYPE_GUEST_KERNEL && |
771 | machine__is_default_guest(kmaps->machine)) { |
772 | dso__set_loaded(curr_map->dso, curr_map->type); |
773 | } |
774 | |
775 | return count + moved; |
776 | } |
777 | |
778 | static bool symbol__restricted_filename(const char *filename, |
779 | const char *restricted_filename) |
780 | { |
781 | bool restricted = false; |
782 | |
783 | if (symbol_conf.kptr_restrict) { |
784 | char *r = realpath(filename, NULL); |
785 | |
786 | if (r != NULL) { |
787 | restricted = strcmp(r, restricted_filename) == 0; |
788 | free(r); |
789 | return restricted; |
790 | } |
791 | } |
792 | |
793 | return restricted; |
794 | } |
795 | |
796 | int dso__load_kallsyms(struct dso *dso, const char *filename, |
797 | struct map *map, symbol_filter_t filter) |
798 | { |
799 | if (symbol__restricted_filename(filename, "/proc/kallsyms")) |
800 | return -1; |
801 | |
802 | if (dso__load_all_kallsyms(dso, filename, map) < 0) |
803 | return -1; |
804 | |
805 | symbols__fixup_duplicate(&dso->symbols[map->type]); |
806 | symbols__fixup_end(&dso->symbols[map->type]); |
807 | |
808 | if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
809 | dso->symtab_type = SYMTAB__GUEST_KALLSYMS; |
810 | else |
811 | dso->symtab_type = SYMTAB__KALLSYMS; |
812 | |
813 | return dso__split_kallsyms(dso, map, filter); |
814 | } |
815 | |
816 | static int dso__load_perf_map(struct dso *dso, struct map *map, |
817 | symbol_filter_t filter) |
818 | { |
819 | char *line = NULL; |
820 | size_t n; |
821 | FILE *file; |
822 | int nr_syms = 0; |
823 | |
824 | file = fopen(dso->long_name, "r"); |
825 | if (file == NULL) |
826 | goto out_failure; |
827 | |
828 | while (!feof(file)) { |
829 | u64 start, size; |
830 | struct symbol *sym; |
831 | int line_len, len; |
832 | |
833 | line_len = getline(&line, &n, file); |
834 | if (line_len < 0) |
835 | break; |
836 | |
837 | if (!line) |
838 | goto out_failure; |
839 | |
840 | line[--line_len] = '\0'; /* \n */ |
841 | |
842 | len = hex2u64(line, &start); |
843 | |
844 | len++; |
845 | if (len + 2 >= line_len) |
846 | continue; |
847 | |
848 | len += hex2u64(line + len, &size); |
849 | |
850 | len++; |
851 | if (len + 2 >= line_len) |
852 | continue; |
853 | |
854 | sym = symbol__new(start, size, STB_GLOBAL, line + len); |
855 | |
856 | if (sym == NULL) |
857 | goto out_delete_line; |
858 | |
859 | if (filter && filter(map, sym)) |
860 | symbol__delete(sym); |
861 | else { |
862 | symbols__insert(&dso->symbols[map->type], sym); |
863 | nr_syms++; |
864 | } |
865 | } |
866 | |
867 | free(line); |
868 | fclose(file); |
869 | |
870 | return nr_syms; |
871 | |
872 | out_delete_line: |
873 | free(line); |
874 | out_failure: |
875 | return -1; |
876 | } |
877 | |
878 | /** |
879 | * elf_symtab__for_each_symbol - iterate thru all the symbols |
880 | * |
881 | * @syms: struct elf_symtab instance to iterate |
882 | * @idx: uint32_t idx |
883 | * @sym: GElf_Sym iterator |
884 | */ |
885 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ |
886 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ |
887 | idx < nr_syms; \ |
888 | idx++, gelf_getsym(syms, idx, &sym)) |
889 | |
890 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) |
891 | { |
892 | return GELF_ST_TYPE(sym->st_info); |
893 | } |
894 | |
895 | static inline int elf_sym__is_function(const GElf_Sym *sym) |
896 | { |
897 | return elf_sym__type(sym) == STT_FUNC && |
898 | sym->st_name != 0 && |
899 | sym->st_shndx != SHN_UNDEF; |
900 | } |
901 | |
902 | static inline bool elf_sym__is_object(const GElf_Sym *sym) |
903 | { |
904 | return elf_sym__type(sym) == STT_OBJECT && |
905 | sym->st_name != 0 && |
906 | sym->st_shndx != SHN_UNDEF; |
907 | } |
908 | |
909 | static inline int elf_sym__is_label(const GElf_Sym *sym) |
910 | { |
911 | return elf_sym__type(sym) == STT_NOTYPE && |
912 | sym->st_name != 0 && |
913 | sym->st_shndx != SHN_UNDEF && |
914 | sym->st_shndx != SHN_ABS; |
915 | } |
916 | |
917 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, |
918 | const Elf_Data *secstrs) |
919 | { |
920 | return secstrs->d_buf + shdr->sh_name; |
921 | } |
922 | |
923 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, |
924 | const Elf_Data *secstrs) |
925 | { |
926 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; |
927 | } |
928 | |
929 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, |
930 | const Elf_Data *secstrs) |
931 | { |
932 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; |
933 | } |
934 | |
935 | static inline const char *elf_sym__name(const GElf_Sym *sym, |
936 | const Elf_Data *symstrs) |
937 | { |
938 | return symstrs->d_buf + sym->st_name; |
939 | } |
940 | |
941 | static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
942 | GElf_Shdr *shp, const char *name, |
943 | size_t *idx) |
944 | { |
945 | Elf_Scn *sec = NULL; |
946 | size_t cnt = 1; |
947 | |
948 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
949 | char *str; |
950 | |
951 | gelf_getshdr(sec, shp); |
952 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); |
953 | if (!strcmp(name, str)) { |
954 | if (idx) |
955 | *idx = cnt; |
956 | break; |
957 | } |
958 | ++cnt; |
959 | } |
960 | |
961 | return sec; |
962 | } |
963 | |
964 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
965 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ |
966 | idx < nr_entries; \ |
967 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) |
968 | |
969 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ |
970 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ |
971 | idx < nr_entries; \ |
972 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) |
973 | |
974 | /* |
975 | * We need to check if we have a .dynsym, so that we can handle the |
976 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it |
977 | * .dynsym or .symtab). |
978 | * And always look at the original dso, not at debuginfo packages, that |
979 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). |
980 | */ |
981 | static int |
982 | dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map, |
983 | symbol_filter_t filter) |
984 | { |
985 | uint32_t nr_rel_entries, idx; |
986 | GElf_Sym sym; |
987 | u64 plt_offset; |
988 | GElf_Shdr shdr_plt; |
989 | struct symbol *f; |
990 | GElf_Shdr shdr_rel_plt, shdr_dynsym; |
991 | Elf_Data *reldata, *syms, *symstrs; |
992 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; |
993 | size_t dynsym_idx; |
994 | GElf_Ehdr ehdr; |
995 | char sympltname[1024]; |
996 | Elf *elf; |
997 | int nr = 0, symidx, fd, err = 0; |
998 | |
999 | fd = open(name, O_RDONLY); |
1000 | if (fd < 0) |
1001 | goto out; |
1002 | |
1003 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
1004 | if (elf == NULL) |
1005 | goto out_close; |
1006 | |
1007 | if (gelf_getehdr(elf, &ehdr) == NULL) |
1008 | goto out_elf_end; |
1009 | |
1010 | scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym, |
1011 | ".dynsym", &dynsym_idx); |
1012 | if (scn_dynsym == NULL) |
1013 | goto out_elf_end; |
1014 | |
1015 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
1016 | ".rela.plt", NULL); |
1017 | if (scn_plt_rel == NULL) { |
1018 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
1019 | ".rel.plt", NULL); |
1020 | if (scn_plt_rel == NULL) |
1021 | goto out_elf_end; |
1022 | } |
1023 | |
1024 | err = -1; |
1025 | |
1026 | if (shdr_rel_plt.sh_link != dynsym_idx) |
1027 | goto out_elf_end; |
1028 | |
1029 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) |
1030 | goto out_elf_end; |
1031 | |
1032 | /* |
1033 | * Fetch the relocation section to find the idxes to the GOT |
1034 | * and the symbols in the .dynsym they refer to. |
1035 | */ |
1036 | reldata = elf_getdata(scn_plt_rel, NULL); |
1037 | if (reldata == NULL) |
1038 | goto out_elf_end; |
1039 | |
1040 | syms = elf_getdata(scn_dynsym, NULL); |
1041 | if (syms == NULL) |
1042 | goto out_elf_end; |
1043 | |
1044 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); |
1045 | if (scn_symstrs == NULL) |
1046 | goto out_elf_end; |
1047 | |
1048 | symstrs = elf_getdata(scn_symstrs, NULL); |
1049 | if (symstrs == NULL) |
1050 | goto out_elf_end; |
1051 | |
1052 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
1053 | plt_offset = shdr_plt.sh_offset; |
1054 | |
1055 | if (shdr_rel_plt.sh_type == SHT_RELA) { |
1056 | GElf_Rela pos_mem, *pos; |
1057 | |
1058 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, |
1059 | nr_rel_entries) { |
1060 | symidx = GELF_R_SYM(pos->r_info); |
1061 | plt_offset += shdr_plt.sh_entsize; |
1062 | gelf_getsym(syms, symidx, &sym); |
1063 | snprintf(sympltname, sizeof(sympltname), |
1064 | "%s@plt", elf_sym__name(&sym, symstrs)); |
1065 | |
1066 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, |
1067 | STB_GLOBAL, sympltname); |
1068 | if (!f) |
1069 | goto out_elf_end; |
1070 | |
1071 | if (filter && filter(map, f)) |
1072 | symbol__delete(f); |
1073 | else { |
1074 | symbols__insert(&dso->symbols[map->type], f); |
1075 | ++nr; |
1076 | } |
1077 | } |
1078 | } else if (shdr_rel_plt.sh_type == SHT_REL) { |
1079 | GElf_Rel pos_mem, *pos; |
1080 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, |
1081 | nr_rel_entries) { |
1082 | symidx = GELF_R_SYM(pos->r_info); |
1083 | plt_offset += shdr_plt.sh_entsize; |
1084 | gelf_getsym(syms, symidx, &sym); |
1085 | snprintf(sympltname, sizeof(sympltname), |
1086 | "%s@plt", elf_sym__name(&sym, symstrs)); |
1087 | |
1088 | f = symbol__new(plt_offset, shdr_plt.sh_entsize, |
1089 | STB_GLOBAL, sympltname); |
1090 | if (!f) |
1091 | goto out_elf_end; |
1092 | |
1093 | if (filter && filter(map, f)) |
1094 | symbol__delete(f); |
1095 | else { |
1096 | symbols__insert(&dso->symbols[map->type], f); |
1097 | ++nr; |
1098 | } |
1099 | } |
1100 | } |
1101 | |
1102 | err = 0; |
1103 | out_elf_end: |
1104 | elf_end(elf); |
1105 | out_close: |
1106 | close(fd); |
1107 | |
1108 | if (err == 0) |
1109 | return nr; |
1110 | out: |
1111 | pr_debug("%s: problems reading %s PLT info.\n", |
1112 | __func__, dso->long_name); |
1113 | return 0; |
1114 | } |
1115 | |
1116 | static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type) |
1117 | { |
1118 | switch (type) { |
1119 | case MAP__FUNCTION: |
1120 | return elf_sym__is_function(sym); |
1121 | case MAP__VARIABLE: |
1122 | return elf_sym__is_object(sym); |
1123 | default: |
1124 | return false; |
1125 | } |
1126 | } |
1127 | |
1128 | static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs, |
1129 | enum map_type type) |
1130 | { |
1131 | switch (type) { |
1132 | case MAP__FUNCTION: |
1133 | return elf_sec__is_text(shdr, secstrs); |
1134 | case MAP__VARIABLE: |
1135 | return elf_sec__is_data(shdr, secstrs); |
1136 | default: |
1137 | return false; |
1138 | } |
1139 | } |
1140 | |
1141 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) |
1142 | { |
1143 | Elf_Scn *sec = NULL; |
1144 | GElf_Shdr shdr; |
1145 | size_t cnt = 1; |
1146 | |
1147 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
1148 | gelf_getshdr(sec, &shdr); |
1149 | |
1150 | if ((addr >= shdr.sh_addr) && |
1151 | (addr < (shdr.sh_addr + shdr.sh_size))) |
1152 | return cnt; |
1153 | |
1154 | ++cnt; |
1155 | } |
1156 | |
1157 | return -1; |
1158 | } |
1159 | |
1160 | static int dso__swap_init(struct dso *dso, unsigned char eidata) |
1161 | { |
1162 | static unsigned int const endian = 1; |
1163 | |
1164 | dso->needs_swap = DSO_SWAP__NO; |
1165 | |
1166 | switch (eidata) { |
1167 | case ELFDATA2LSB: |
1168 | /* We are big endian, DSO is little endian. */ |
1169 | if (*(unsigned char const *)&endian != 1) |
1170 | dso->needs_swap = DSO_SWAP__YES; |
1171 | break; |
1172 | |
1173 | case ELFDATA2MSB: |
1174 | /* We are little endian, DSO is big endian. */ |
1175 | if (*(unsigned char const *)&endian != 0) |
1176 | dso->needs_swap = DSO_SWAP__YES; |
1177 | break; |
1178 | |
1179 | default: |
1180 | pr_err("unrecognized DSO data encoding %d\n", eidata); |
1181 | return -EINVAL; |
1182 | } |
1183 | |
1184 | return 0; |
1185 | } |
1186 | |
1187 | static int dso__load_sym(struct dso *dso, struct map *map, const char *name, |
1188 | int fd, symbol_filter_t filter, int kmodule, |
1189 | int want_symtab) |
1190 | { |
1191 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; |
1192 | struct map *curr_map = map; |
1193 | struct dso *curr_dso = dso; |
1194 | Elf_Data *symstrs, *secstrs; |
1195 | uint32_t nr_syms; |
1196 | int err = -1; |
1197 | uint32_t idx; |
1198 | GElf_Ehdr ehdr; |
1199 | GElf_Shdr shdr, opdshdr; |
1200 | Elf_Data *syms, *opddata = NULL; |
1201 | GElf_Sym sym; |
1202 | Elf_Scn *sec, *sec_strndx, *opdsec; |
1203 | Elf *elf; |
1204 | int nr = 0; |
1205 | size_t opdidx = 0; |
1206 | |
1207 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
1208 | if (elf == NULL) { |
1209 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); |
1210 | goto out_close; |
1211 | } |
1212 | |
1213 | if (gelf_getehdr(elf, &ehdr) == NULL) { |
1214 | pr_debug("%s: cannot get elf header.\n", __func__); |
1215 | goto out_elf_end; |
1216 | } |
1217 | |
1218 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) |
1219 | goto out_elf_end; |
1220 | |
1221 | /* Always reject images with a mismatched build-id: */ |
1222 | if (dso->has_build_id) { |
1223 | u8 build_id[BUILD_ID_SIZE]; |
1224 | |
1225 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) |
1226 | goto out_elf_end; |
1227 | |
1228 | if (!dso__build_id_equal(dso, build_id)) |
1229 | goto out_elf_end; |
1230 | } |
1231 | |
1232 | sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL); |
1233 | if (sec == NULL) { |
1234 | if (want_symtab) |
1235 | goto out_elf_end; |
1236 | |
1237 | sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL); |
1238 | if (sec == NULL) |
1239 | goto out_elf_end; |
1240 | } |
1241 | |
1242 | opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx); |
1243 | if (opdshdr.sh_type != SHT_PROGBITS) |
1244 | opdsec = NULL; |
1245 | if (opdsec) |
1246 | opddata = elf_rawdata(opdsec, NULL); |
1247 | |
1248 | syms = elf_getdata(sec, NULL); |
1249 | if (syms == NULL) |
1250 | goto out_elf_end; |
1251 | |
1252 | sec = elf_getscn(elf, shdr.sh_link); |
1253 | if (sec == NULL) |
1254 | goto out_elf_end; |
1255 | |
1256 | symstrs = elf_getdata(sec, NULL); |
1257 | if (symstrs == NULL) |
1258 | goto out_elf_end; |
1259 | |
1260 | sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); |
1261 | if (sec_strndx == NULL) |
1262 | goto out_elf_end; |
1263 | |
1264 | secstrs = elf_getdata(sec_strndx, NULL); |
1265 | if (secstrs == NULL) |
1266 | goto out_elf_end; |
1267 | |
1268 | nr_syms = shdr.sh_size / shdr.sh_entsize; |
1269 | |
1270 | memset(&sym, 0, sizeof(sym)); |
1271 | if (dso->kernel == DSO_TYPE_USER) { |
1272 | dso->adjust_symbols = (ehdr.e_type == ET_EXEC || |
1273 | elf_section_by_name(elf, &ehdr, &shdr, |
1274 | ".gnu.prelink_undo", |
1275 | NULL) != NULL); |
1276 | } else { |
1277 | dso->adjust_symbols = 0; |
1278 | } |
1279 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
1280 | struct symbol *f; |
1281 | const char *elf_name = elf_sym__name(&sym, symstrs); |
1282 | char *demangled = NULL; |
1283 | int is_label = elf_sym__is_label(&sym); |
1284 | const char *section_name; |
1285 | |
1286 | if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && |
1287 | strcmp(elf_name, kmap->ref_reloc_sym->name) == 0) |
1288 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; |
1289 | |
1290 | if (!is_label && !elf_sym__is_a(&sym, map->type)) |
1291 | continue; |
1292 | |
1293 | /* Reject ARM ELF "mapping symbols": these aren't unique and |
1294 | * don't identify functions, so will confuse the profile |
1295 | * output: */ |
1296 | if (ehdr.e_machine == EM_ARM) { |
1297 | if (!strcmp(elf_name, "$a") || |
1298 | !strcmp(elf_name, "$d") || |
1299 | !strcmp(elf_name, "$t")) |
1300 | continue; |
1301 | } |
1302 | |
1303 | if (opdsec && sym.st_shndx == opdidx) { |
1304 | u32 offset = sym.st_value - opdshdr.sh_addr; |
1305 | u64 *opd = opddata->d_buf + offset; |
1306 | sym.st_value = DSO__SWAP(dso, u64, *opd); |
1307 | sym.st_shndx = elf_addr_to_index(elf, sym.st_value); |
1308 | } |
1309 | |
1310 | sec = elf_getscn(elf, sym.st_shndx); |
1311 | if (!sec) |
1312 | goto out_elf_end; |
1313 | |
1314 | gelf_getshdr(sec, &shdr); |
1315 | |
1316 | if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) |
1317 | continue; |
1318 | |
1319 | section_name = elf_sec__name(&shdr, secstrs); |
1320 | |
1321 | /* On ARM, symbols for thumb functions have 1 added to |
1322 | * the symbol address as a flag - remove it */ |
1323 | if ((ehdr.e_machine == EM_ARM) && |
1324 | (map->type == MAP__FUNCTION) && |
1325 | (sym.st_value & 1)) |
1326 | --sym.st_value; |
1327 | |
1328 | if (dso->kernel != DSO_TYPE_USER || kmodule) { |
1329 | char dso_name[PATH_MAX]; |
1330 | |
1331 | if (strcmp(section_name, |
1332 | (curr_dso->short_name + |
1333 | dso->short_name_len)) == 0) |
1334 | goto new_symbol; |
1335 | |
1336 | if (strcmp(section_name, ".text") == 0) { |
1337 | curr_map = map; |
1338 | curr_dso = dso; |
1339 | goto new_symbol; |
1340 | } |
1341 | |
1342 | snprintf(dso_name, sizeof(dso_name), |
1343 | "%s%s", dso->short_name, section_name); |
1344 | |
1345 | curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name); |
1346 | if (curr_map == NULL) { |
1347 | u64 start = sym.st_value; |
1348 | |
1349 | if (kmodule) |
1350 | start += map->start + shdr.sh_offset; |
1351 | |
1352 | curr_dso = dso__new(dso_name); |
1353 | if (curr_dso == NULL) |
1354 | goto out_elf_end; |
1355 | curr_dso->kernel = dso->kernel; |
1356 | curr_dso->long_name = dso->long_name; |
1357 | curr_dso->long_name_len = dso->long_name_len; |
1358 | curr_map = map__new2(start, curr_dso, |
1359 | map->type); |
1360 | if (curr_map == NULL) { |
1361 | dso__delete(curr_dso); |
1362 | goto out_elf_end; |
1363 | } |
1364 | curr_map->map_ip = identity__map_ip; |
1365 | curr_map->unmap_ip = identity__map_ip; |
1366 | curr_dso->symtab_type = dso->symtab_type; |
1367 | map_groups__insert(kmap->kmaps, curr_map); |
1368 | dsos__add(&dso->node, curr_dso); |
1369 | dso__set_loaded(curr_dso, map->type); |
1370 | } else |
1371 | curr_dso = curr_map->dso; |
1372 | |
1373 | goto new_symbol; |
1374 | } |
1375 | |
1376 | if (curr_dso->adjust_symbols) { |
1377 | pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " |
1378 | "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, |
1379 | (u64)sym.st_value, (u64)shdr.sh_addr, |
1380 | (u64)shdr.sh_offset); |
1381 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; |
1382 | } |
1383 | /* |
1384 | * We need to figure out if the object was created from C++ sources |
1385 | * DWARF DW_compile_unit has this, but we don't always have access |
1386 | * to it... |
1387 | */ |
1388 | demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI); |
1389 | if (demangled != NULL) |
1390 | elf_name = demangled; |
1391 | new_symbol: |
1392 | f = symbol__new(sym.st_value, sym.st_size, |
1393 | GELF_ST_BIND(sym.st_info), elf_name); |
1394 | free(demangled); |
1395 | if (!f) |
1396 | goto out_elf_end; |
1397 | |
1398 | if (filter && filter(curr_map, f)) |
1399 | symbol__delete(f); |
1400 | else { |
1401 | symbols__insert(&curr_dso->symbols[curr_map->type], f); |
1402 | nr++; |
1403 | } |
1404 | } |
1405 | |
1406 | /* |
1407 | * For misannotated, zeroed, ASM function sizes. |
1408 | */ |
1409 | if (nr > 0) { |
1410 | symbols__fixup_duplicate(&dso->symbols[map->type]); |
1411 | symbols__fixup_end(&dso->symbols[map->type]); |
1412 | if (kmap) { |
1413 | /* |
1414 | * We need to fixup this here too because we create new |
1415 | * maps here, for things like vsyscall sections. |
1416 | */ |
1417 | __map_groups__fixup_end(kmap->kmaps, map->type); |
1418 | } |
1419 | } |
1420 | err = nr; |
1421 | out_elf_end: |
1422 | elf_end(elf); |
1423 | out_close: |
1424 | return err; |
1425 | } |
1426 | |
1427 | static bool dso__build_id_equal(const struct dso *dso, u8 *build_id) |
1428 | { |
1429 | return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0; |
1430 | } |
1431 | |
1432 | bool __dsos__read_build_ids(struct list_head *head, bool with_hits) |
1433 | { |
1434 | bool have_build_id = false; |
1435 | struct dso *pos; |
1436 | |
1437 | list_for_each_entry(pos, head, node) { |
1438 | if (with_hits && !pos->hit) |
1439 | continue; |
1440 | if (pos->has_build_id) { |
1441 | have_build_id = true; |
1442 | continue; |
1443 | } |
1444 | if (filename__read_build_id(pos->long_name, pos->build_id, |
1445 | sizeof(pos->build_id)) > 0) { |
1446 | have_build_id = true; |
1447 | pos->has_build_id = true; |
1448 | } |
1449 | } |
1450 | |
1451 | return have_build_id; |
1452 | } |
1453 | |
1454 | /* |
1455 | * Align offset to 4 bytes as needed for note name and descriptor data. |
1456 | */ |
1457 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) |
1458 | |
1459 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) |
1460 | { |
1461 | int err = -1; |
1462 | GElf_Ehdr ehdr; |
1463 | GElf_Shdr shdr; |
1464 | Elf_Data *data; |
1465 | Elf_Scn *sec; |
1466 | Elf_Kind ek; |
1467 | void *ptr; |
1468 | |
1469 | if (size < BUILD_ID_SIZE) |
1470 | goto out; |
1471 | |
1472 | ek = elf_kind(elf); |
1473 | if (ek != ELF_K_ELF) |
1474 | goto out; |
1475 | |
1476 | if (gelf_getehdr(elf, &ehdr) == NULL) { |
1477 | pr_err("%s: cannot get elf header.\n", __func__); |
1478 | goto out; |
1479 | } |
1480 | |
1481 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
1482 | ".note.gnu.build-id", NULL); |
1483 | if (sec == NULL) { |
1484 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
1485 | ".notes", NULL); |
1486 | if (sec == NULL) |
1487 | goto out; |
1488 | } |
1489 | |
1490 | data = elf_getdata(sec, NULL); |
1491 | if (data == NULL) |
1492 | goto out; |
1493 | |
1494 | ptr = data->d_buf; |
1495 | while (ptr < (data->d_buf + data->d_size)) { |
1496 | GElf_Nhdr *nhdr = ptr; |
1497 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), |
1498 | descsz = NOTE_ALIGN(nhdr->n_descsz); |
1499 | const char *name; |
1500 | |
1501 | ptr += sizeof(*nhdr); |
1502 | name = ptr; |
1503 | ptr += namesz; |
1504 | if (nhdr->n_type == NT_GNU_BUILD_ID && |
1505 | nhdr->n_namesz == sizeof("GNU")) { |
1506 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { |
1507 | size_t sz = min(size, descsz); |
1508 | memcpy(bf, ptr, sz); |
1509 | memset(bf + sz, 0, size - sz); |
1510 | err = descsz; |
1511 | break; |
1512 | } |
1513 | } |
1514 | ptr += descsz; |
1515 | } |
1516 | |
1517 | out: |
1518 | return err; |
1519 | } |
1520 | |
1521 | int filename__read_build_id(const char *filename, void *bf, size_t size) |
1522 | { |
1523 | int fd, err = -1; |
1524 | Elf *elf; |
1525 | |
1526 | if (size < BUILD_ID_SIZE) |
1527 | goto out; |
1528 | |
1529 | fd = open(filename, O_RDONLY); |
1530 | if (fd < 0) |
1531 | goto out; |
1532 | |
1533 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
1534 | if (elf == NULL) { |
1535 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); |
1536 | goto out_close; |
1537 | } |
1538 | |
1539 | err = elf_read_build_id(elf, bf, size); |
1540 | |
1541 | elf_end(elf); |
1542 | out_close: |
1543 | close(fd); |
1544 | out: |
1545 | return err; |
1546 | } |
1547 | |
1548 | int sysfs__read_build_id(const char *filename, void *build_id, size_t size) |
1549 | { |
1550 | int fd, err = -1; |
1551 | |
1552 | if (size < BUILD_ID_SIZE) |
1553 | goto out; |
1554 | |
1555 | fd = open(filename, O_RDONLY); |
1556 | if (fd < 0) |
1557 | goto out; |
1558 | |
1559 | while (1) { |
1560 | char bf[BUFSIZ]; |
1561 | GElf_Nhdr nhdr; |
1562 | size_t namesz, descsz; |
1563 | |
1564 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) |
1565 | break; |
1566 | |
1567 | namesz = NOTE_ALIGN(nhdr.n_namesz); |
1568 | descsz = NOTE_ALIGN(nhdr.n_descsz); |
1569 | if (nhdr.n_type == NT_GNU_BUILD_ID && |
1570 | nhdr.n_namesz == sizeof("GNU")) { |
1571 | if (read(fd, bf, namesz) != (ssize_t)namesz) |
1572 | break; |
1573 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { |
1574 | size_t sz = min(descsz, size); |
1575 | if (read(fd, build_id, sz) == (ssize_t)sz) { |
1576 | memset(build_id + sz, 0, size - sz); |
1577 | err = 0; |
1578 | break; |
1579 | } |
1580 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) |
1581 | break; |
1582 | } else { |
1583 | int n = namesz + descsz; |
1584 | if (read(fd, bf, n) != n) |
1585 | break; |
1586 | } |
1587 | } |
1588 | close(fd); |
1589 | out: |
1590 | return err; |
1591 | } |
1592 | |
1593 | char dso__symtab_origin(const struct dso *dso) |
1594 | { |
1595 | static const char origin[] = { |
1596 | [SYMTAB__KALLSYMS] = 'k', |
1597 | [SYMTAB__JAVA_JIT] = 'j', |
1598 | [SYMTAB__BUILD_ID_CACHE] = 'B', |
1599 | [SYMTAB__FEDORA_DEBUGINFO] = 'f', |
1600 | [SYMTAB__UBUNTU_DEBUGINFO] = 'u', |
1601 | [SYMTAB__BUILDID_DEBUGINFO] = 'b', |
1602 | [SYMTAB__SYSTEM_PATH_DSO] = 'd', |
1603 | [SYMTAB__SYSTEM_PATH_KMODULE] = 'K', |
1604 | [SYMTAB__GUEST_KALLSYMS] = 'g', |
1605 | [SYMTAB__GUEST_KMODULE] = 'G', |
1606 | }; |
1607 | |
1608 | if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND) |
1609 | return '!'; |
1610 | return origin[dso->symtab_type]; |
1611 | } |
1612 | |
1613 | int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) |
1614 | { |
1615 | int size = PATH_MAX; |
1616 | char *name; |
1617 | int ret = -1; |
1618 | int fd; |
1619 | struct machine *machine; |
1620 | const char *root_dir; |
1621 | int want_symtab; |
1622 | |
1623 | dso__set_loaded(dso, map->type); |
1624 | |
1625 | if (dso->kernel == DSO_TYPE_KERNEL) |
1626 | return dso__load_kernel_sym(dso, map, filter); |
1627 | else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
1628 | return dso__load_guest_kernel_sym(dso, map, filter); |
1629 | |
1630 | if (map->groups && map->groups->machine) |
1631 | machine = map->groups->machine; |
1632 | else |
1633 | machine = NULL; |
1634 | |
1635 | name = malloc(size); |
1636 | if (!name) |
1637 | return -1; |
1638 | |
1639 | dso->adjust_symbols = 0; |
1640 | |
1641 | if (strncmp(dso->name, "/tmp/perf-", 10) == 0) { |
1642 | struct stat st; |
1643 | |
1644 | if (lstat(dso->name, &st) < 0) |
1645 | return -1; |
1646 | |
1647 | if (st.st_uid && (st.st_uid != geteuid())) { |
1648 | pr_warning("File %s not owned by current user or root, " |
1649 | "ignoring it.\n", dso->name); |
1650 | return -1; |
1651 | } |
1652 | |
1653 | ret = dso__load_perf_map(dso, map, filter); |
1654 | dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT : |
1655 | SYMTAB__NOT_FOUND; |
1656 | return ret; |
1657 | } |
1658 | |
1659 | /* Iterate over candidate debug images. |
1660 | * On the first pass, only load images if they have a full symtab. |
1661 | * Failing that, do a second pass where we accept .dynsym also |
1662 | */ |
1663 | want_symtab = 1; |
1664 | restart: |
1665 | for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE; |
1666 | dso->symtab_type != SYMTAB__NOT_FOUND; |
1667 | dso->symtab_type++) { |
1668 | switch (dso->symtab_type) { |
1669 | case SYMTAB__BUILD_ID_CACHE: |
1670 | /* skip the locally configured cache if a symfs is given */ |
1671 | if (symbol_conf.symfs[0] || |
1672 | (dso__build_id_filename(dso, name, size) == NULL)) { |
1673 | continue; |
1674 | } |
1675 | break; |
1676 | case SYMTAB__FEDORA_DEBUGINFO: |
1677 | snprintf(name, size, "%s/usr/lib/debug%s.debug", |
1678 | symbol_conf.symfs, dso->long_name); |
1679 | break; |
1680 | case SYMTAB__UBUNTU_DEBUGINFO: |
1681 | snprintf(name, size, "%s/usr/lib/debug%s", |
1682 | symbol_conf.symfs, dso->long_name); |
1683 | break; |
1684 | case SYMTAB__BUILDID_DEBUGINFO: { |
1685 | char build_id_hex[BUILD_ID_SIZE * 2 + 1]; |
1686 | |
1687 | if (!dso->has_build_id) |
1688 | continue; |
1689 | |
1690 | build_id__sprintf(dso->build_id, |
1691 | sizeof(dso->build_id), |
1692 | build_id_hex); |
1693 | snprintf(name, size, |
1694 | "%s/usr/lib/debug/.build-id/%.2s/%s.debug", |
1695 | symbol_conf.symfs, build_id_hex, build_id_hex + 2); |
1696 | } |
1697 | break; |
1698 | case SYMTAB__SYSTEM_PATH_DSO: |
1699 | snprintf(name, size, "%s%s", |
1700 | symbol_conf.symfs, dso->long_name); |
1701 | break; |
1702 | case SYMTAB__GUEST_KMODULE: |
1703 | if (map->groups && machine) |
1704 | root_dir = machine->root_dir; |
1705 | else |
1706 | root_dir = ""; |
1707 | snprintf(name, size, "%s%s%s", symbol_conf.symfs, |
1708 | root_dir, dso->long_name); |
1709 | break; |
1710 | |
1711 | case SYMTAB__SYSTEM_PATH_KMODULE: |
1712 | snprintf(name, size, "%s%s", symbol_conf.symfs, |
1713 | dso->long_name); |
1714 | break; |
1715 | default:; |
1716 | } |
1717 | |
1718 | /* Name is now the name of the next image to try */ |
1719 | fd = open(name, O_RDONLY); |
1720 | if (fd < 0) |
1721 | continue; |
1722 | |
1723 | ret = dso__load_sym(dso, map, name, fd, filter, 0, |
1724 | want_symtab); |
1725 | close(fd); |
1726 | |
1727 | /* |
1728 | * Some people seem to have debuginfo files _WITHOUT_ debug |
1729 | * info!?!? |
1730 | */ |
1731 | if (!ret) |
1732 | continue; |
1733 | |
1734 | if (ret > 0) { |
1735 | int nr_plt; |
1736 | |
1737 | nr_plt = dso__synthesize_plt_symbols(dso, name, map, filter); |
1738 | if (nr_plt > 0) |
1739 | ret += nr_plt; |
1740 | break; |
1741 | } |
1742 | } |
1743 | |
1744 | /* |
1745 | * If we wanted a full symtab but no image had one, |
1746 | * relax our requirements and repeat the search. |
1747 | */ |
1748 | if (ret <= 0 && want_symtab) { |
1749 | want_symtab = 0; |
1750 | goto restart; |
1751 | } |
1752 | |
1753 | free(name); |
1754 | if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) |
1755 | return 0; |
1756 | return ret; |
1757 | } |
1758 | |
1759 | struct map *map_groups__find_by_name(struct map_groups *mg, |
1760 | enum map_type type, const char *name) |
1761 | { |
1762 | struct rb_node *nd; |
1763 | |
1764 | for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) { |
1765 | struct map *map = rb_entry(nd, struct map, rb_node); |
1766 | |
1767 | if (map->dso && strcmp(map->dso->short_name, name) == 0) |
1768 | return map; |
1769 | } |
1770 | |
1771 | return NULL; |
1772 | } |
1773 | |
1774 | static int dso__kernel_module_get_build_id(struct dso *dso, |
1775 | const char *root_dir) |
1776 | { |
1777 | char filename[PATH_MAX]; |
1778 | /* |
1779 | * kernel module short names are of the form "[module]" and |
1780 | * we need just "module" here. |
1781 | */ |
1782 | const char *name = dso->short_name + 1; |
1783 | |
1784 | snprintf(filename, sizeof(filename), |
1785 | "%s/sys/module/%.*s/notes/.note.gnu.build-id", |
1786 | root_dir, (int)strlen(name) - 1, name); |
1787 | |
1788 | if (sysfs__read_build_id(filename, dso->build_id, |
1789 | sizeof(dso->build_id)) == 0) |
1790 | dso->has_build_id = true; |
1791 | |
1792 | return 0; |
1793 | } |
1794 | |
1795 | static int map_groups__set_modules_path_dir(struct map_groups *mg, |
1796 | const char *dir_name) |
1797 | { |
1798 | struct dirent *dent; |
1799 | DIR *dir = opendir(dir_name); |
1800 | int ret = 0; |
1801 | |
1802 | if (!dir) { |
1803 | pr_debug("%s: cannot open %s dir\n", __func__, dir_name); |
1804 | return -1; |
1805 | } |
1806 | |
1807 | while ((dent = readdir(dir)) != NULL) { |
1808 | char path[PATH_MAX]; |
1809 | struct stat st; |
1810 | |
1811 | /*sshfs might return bad dent->d_type, so we have to stat*/ |
1812 | snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name); |
1813 | if (stat(path, &st)) |
1814 | continue; |
1815 | |
1816 | if (S_ISDIR(st.st_mode)) { |
1817 | if (!strcmp(dent->d_name, ".") || |
1818 | !strcmp(dent->d_name, "..")) |
1819 | continue; |
1820 | |
1821 | ret = map_groups__set_modules_path_dir(mg, path); |
1822 | if (ret < 0) |
1823 | goto out; |
1824 | } else { |
1825 | char *dot = strrchr(dent->d_name, '.'), |
1826 | dso_name[PATH_MAX]; |
1827 | struct map *map; |
1828 | char *long_name; |
1829 | |
1830 | if (dot == NULL || strcmp(dot, ".ko")) |
1831 | continue; |
1832 | snprintf(dso_name, sizeof(dso_name), "[%.*s]", |
1833 | (int)(dot - dent->d_name), dent->d_name); |
1834 | |
1835 | strxfrchar(dso_name, '-', '_'); |
1836 | map = map_groups__find_by_name(mg, MAP__FUNCTION, |
1837 | dso_name); |
1838 | if (map == NULL) |
1839 | continue; |
1840 | |
1841 | long_name = strdup(path); |
1842 | if (long_name == NULL) { |
1843 | ret = -1; |
1844 | goto out; |
1845 | } |
1846 | dso__set_long_name(map->dso, long_name); |
1847 | map->dso->lname_alloc = 1; |
1848 | dso__kernel_module_get_build_id(map->dso, ""); |
1849 | } |
1850 | } |
1851 | |
1852 | out: |
1853 | closedir(dir); |
1854 | return ret; |
1855 | } |
1856 | |
1857 | static char *get_kernel_version(const char *root_dir) |
1858 | { |
1859 | char version[PATH_MAX]; |
1860 | FILE *file; |
1861 | char *name, *tmp; |
1862 | const char *prefix = "Linux version "; |
1863 | |
1864 | sprintf(version, "%s/proc/version", root_dir); |
1865 | file = fopen(version, "r"); |
1866 | if (!file) |
1867 | return NULL; |
1868 | |
1869 | version[0] = '\0'; |
1870 | tmp = fgets(version, sizeof(version), file); |
1871 | fclose(file); |
1872 | |
1873 | name = strstr(version, prefix); |
1874 | if (!name) |
1875 | return NULL; |
1876 | name += strlen(prefix); |
1877 | tmp = strchr(name, ' '); |
1878 | if (tmp) |
1879 | *tmp = '\0'; |
1880 | |
1881 | return strdup(name); |
1882 | } |
1883 | |
1884 | static int machine__set_modules_path(struct machine *machine) |
1885 | { |
1886 | char *version; |
1887 | char modules_path[PATH_MAX]; |
1888 | |
1889 | version = get_kernel_version(machine->root_dir); |
1890 | if (!version) |
1891 | return -1; |
1892 | |
1893 | snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel", |
1894 | machine->root_dir, version); |
1895 | free(version); |
1896 | |
1897 | return map_groups__set_modules_path_dir(&machine->kmaps, modules_path); |
1898 | } |
1899 | |
1900 | /* |
1901 | * Constructor variant for modules (where we know from /proc/modules where |
1902 | * they are loaded) and for vmlinux, where only after we load all the |
1903 | * symbols we'll know where it starts and ends. |
1904 | */ |
1905 | static struct map *map__new2(u64 start, struct dso *dso, enum map_type type) |
1906 | { |
1907 | struct map *map = calloc(1, (sizeof(*map) + |
1908 | (dso->kernel ? sizeof(struct kmap) : 0))); |
1909 | if (map != NULL) { |
1910 | /* |
1911 | * ->end will be filled after we load all the symbols |
1912 | */ |
1913 | map__init(map, type, start, 0, 0, dso); |
1914 | } |
1915 | |
1916 | return map; |
1917 | } |
1918 | |
1919 | struct map *machine__new_module(struct machine *machine, u64 start, |
1920 | const char *filename) |
1921 | { |
1922 | struct map *map; |
1923 | struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename); |
1924 | |
1925 | if (dso == NULL) |
1926 | return NULL; |
1927 | |
1928 | map = map__new2(start, dso, MAP__FUNCTION); |
1929 | if (map == NULL) |
1930 | return NULL; |
1931 | |
1932 | if (machine__is_host(machine)) |
1933 | dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE; |
1934 | else |
1935 | dso->symtab_type = SYMTAB__GUEST_KMODULE; |
1936 | map_groups__insert(&machine->kmaps, map); |
1937 | return map; |
1938 | } |
1939 | |
1940 | static int machine__create_modules(struct machine *machine) |
1941 | { |
1942 | char *line = NULL; |
1943 | size_t n; |
1944 | FILE *file; |
1945 | struct map *map; |
1946 | const char *modules; |
1947 | char path[PATH_MAX]; |
1948 | |
1949 | if (machine__is_default_guest(machine)) |
1950 | modules = symbol_conf.default_guest_modules; |
1951 | else { |
1952 | sprintf(path, "%s/proc/modules", machine->root_dir); |
1953 | modules = path; |
1954 | } |
1955 | |
1956 | if (symbol__restricted_filename(path, "/proc/modules")) |
1957 | return -1; |
1958 | |
1959 | file = fopen(modules, "r"); |
1960 | if (file == NULL) |
1961 | return -1; |
1962 | |
1963 | while (!feof(file)) { |
1964 | char name[PATH_MAX]; |
1965 | u64 start; |
1966 | char *sep; |
1967 | int line_len; |
1968 | |
1969 | line_len = getline(&line, &n, file); |
1970 | if (line_len < 0) |
1971 | break; |
1972 | |
1973 | if (!line) |
1974 | goto out_failure; |
1975 | |
1976 | line[--line_len] = '\0'; /* \n */ |
1977 | |
1978 | sep = strrchr(line, 'x'); |
1979 | if (sep == NULL) |
1980 | continue; |
1981 | |
1982 | hex2u64(sep + 1, &start); |
1983 | |
1984 | sep = strchr(line, ' '); |
1985 | if (sep == NULL) |
1986 | continue; |
1987 | |
1988 | *sep = '\0'; |
1989 | |
1990 | snprintf(name, sizeof(name), "[%s]", line); |
1991 | map = machine__new_module(machine, start, name); |
1992 | if (map == NULL) |
1993 | goto out_delete_line; |
1994 | dso__kernel_module_get_build_id(map->dso, machine->root_dir); |
1995 | } |
1996 | |
1997 | free(line); |
1998 | fclose(file); |
1999 | |
2000 | return machine__set_modules_path(machine); |
2001 | |
2002 | out_delete_line: |
2003 | free(line); |
2004 | out_failure: |
2005 | return -1; |
2006 | } |
2007 | |
2008 | int dso__load_vmlinux(struct dso *dso, struct map *map, |
2009 | const char *vmlinux, symbol_filter_t filter) |
2010 | { |
2011 | int err = -1, fd; |
2012 | char symfs_vmlinux[PATH_MAX]; |
2013 | |
2014 | snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s", |
2015 | symbol_conf.symfs, vmlinux); |
2016 | fd = open(symfs_vmlinux, O_RDONLY); |
2017 | if (fd < 0) |
2018 | return -1; |
2019 | |
2020 | dso__set_long_name(dso, (char *)vmlinux); |
2021 | dso__set_loaded(dso, map->type); |
2022 | err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0); |
2023 | close(fd); |
2024 | |
2025 | if (err > 0) |
2026 | pr_debug("Using %s for symbols\n", symfs_vmlinux); |
2027 | |
2028 | return err; |
2029 | } |
2030 | |
2031 | int dso__load_vmlinux_path(struct dso *dso, struct map *map, |
2032 | symbol_filter_t filter) |
2033 | { |
2034 | int i, err = 0; |
2035 | char *filename; |
2036 | |
2037 | pr_debug("Looking at the vmlinux_path (%d entries long)\n", |
2038 | vmlinux_path__nr_entries + 1); |
2039 | |
2040 | filename = dso__build_id_filename(dso, NULL, 0); |
2041 | if (filename != NULL) { |
2042 | err = dso__load_vmlinux(dso, map, filename, filter); |
2043 | if (err > 0) { |
2044 | dso__set_long_name(dso, filename); |
2045 | goto out; |
2046 | } |
2047 | free(filename); |
2048 | } |
2049 | |
2050 | for (i = 0; i < vmlinux_path__nr_entries; ++i) { |
2051 | err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter); |
2052 | if (err > 0) { |
2053 | dso__set_long_name(dso, strdup(vmlinux_path[i])); |
2054 | break; |
2055 | } |
2056 | } |
2057 | out: |
2058 | return err; |
2059 | } |
2060 | |
2061 | static int dso__load_kernel_sym(struct dso *dso, struct map *map, |
2062 | symbol_filter_t filter) |
2063 | { |
2064 | int err; |
2065 | const char *kallsyms_filename = NULL; |
2066 | char *kallsyms_allocated_filename = NULL; |
2067 | /* |
2068 | * Step 1: if the user specified a kallsyms or vmlinux filename, use |
2069 | * it and only it, reporting errors to the user if it cannot be used. |
2070 | * |
2071 | * For instance, try to analyse an ARM perf.data file _without_ a |
2072 | * build-id, or if the user specifies the wrong path to the right |
2073 | * vmlinux file, obviously we can't fallback to another vmlinux (a |
2074 | * x86_86 one, on the machine where analysis is being performed, say), |
2075 | * or worse, /proc/kallsyms. |
2076 | * |
2077 | * If the specified file _has_ a build-id and there is a build-id |
2078 | * section in the perf.data file, we will still do the expected |
2079 | * validation in dso__load_vmlinux and will bail out if they don't |
2080 | * match. |
2081 | */ |
2082 | if (symbol_conf.kallsyms_name != NULL) { |
2083 | kallsyms_filename = symbol_conf.kallsyms_name; |
2084 | goto do_kallsyms; |
2085 | } |
2086 | |
2087 | if (symbol_conf.vmlinux_name != NULL) { |
2088 | err = dso__load_vmlinux(dso, map, |
2089 | symbol_conf.vmlinux_name, filter); |
2090 | if (err > 0) { |
2091 | dso__set_long_name(dso, |
2092 | strdup(symbol_conf.vmlinux_name)); |
2093 | goto out_fixup; |
2094 | } |
2095 | return err; |
2096 | } |
2097 | |
2098 | if (vmlinux_path != NULL) { |
2099 | err = dso__load_vmlinux_path(dso, map, filter); |
2100 | if (err > 0) |
2101 | goto out_fixup; |
2102 | } |
2103 | |
2104 | /* do not try local files if a symfs was given */ |
2105 | if (symbol_conf.symfs[0] != 0) |
2106 | return -1; |
2107 | |
2108 | /* |
2109 | * Say the kernel DSO was created when processing the build-id header table, |
2110 | * we have a build-id, so check if it is the same as the running kernel, |
2111 | * using it if it is. |
2112 | */ |
2113 | if (dso->has_build_id) { |
2114 | u8 kallsyms_build_id[BUILD_ID_SIZE]; |
2115 | char sbuild_id[BUILD_ID_SIZE * 2 + 1]; |
2116 | |
2117 | if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id, |
2118 | sizeof(kallsyms_build_id)) == 0) { |
2119 | if (dso__build_id_equal(dso, kallsyms_build_id)) { |
2120 | kallsyms_filename = "/proc/kallsyms"; |
2121 | goto do_kallsyms; |
2122 | } |
2123 | } |
2124 | /* |
2125 | * Now look if we have it on the build-id cache in |
2126 | * $HOME/.debug/[kernel.kallsyms]. |
2127 | */ |
2128 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), |
2129 | sbuild_id); |
2130 | |
2131 | if (asprintf(&kallsyms_allocated_filename, |
2132 | "%s/.debug/[kernel.kallsyms]/%s", |
2133 | getenv("HOME"), sbuild_id) == -1) { |
2134 | pr_err("Not enough memory for kallsyms file lookup\n"); |
2135 | return -1; |
2136 | } |
2137 | |
2138 | kallsyms_filename = kallsyms_allocated_filename; |
2139 | |
2140 | if (access(kallsyms_filename, F_OK)) { |
2141 | pr_err("No kallsyms or vmlinux with build-id %s " |
2142 | "was found\n", sbuild_id); |
2143 | free(kallsyms_allocated_filename); |
2144 | return -1; |
2145 | } |
2146 | } else { |
2147 | /* |
2148 | * Last resort, if we don't have a build-id and couldn't find |
2149 | * any vmlinux file, try the running kernel kallsyms table. |
2150 | */ |
2151 | kallsyms_filename = "/proc/kallsyms"; |
2152 | } |
2153 | |
2154 | do_kallsyms: |
2155 | err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); |
2156 | if (err > 0) |
2157 | pr_debug("Using %s for symbols\n", kallsyms_filename); |
2158 | free(kallsyms_allocated_filename); |
2159 | |
2160 | if (err > 0) { |
2161 | out_fixup: |
2162 | if (kallsyms_filename != NULL) |
2163 | dso__set_long_name(dso, strdup("[kernel.kallsyms]")); |
2164 | map__fixup_start(map); |
2165 | map__fixup_end(map); |
2166 | } |
2167 | |
2168 | return err; |
2169 | } |
2170 | |
2171 | static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, |
2172 | symbol_filter_t filter) |
2173 | { |
2174 | int err; |
2175 | const char *kallsyms_filename = NULL; |
2176 | struct machine *machine; |
2177 | char path[PATH_MAX]; |
2178 | |
2179 | if (!map->groups) { |
2180 | pr_debug("Guest kernel map hasn't the point to groups\n"); |
2181 | return -1; |
2182 | } |
2183 | machine = map->groups->machine; |
2184 | |
2185 | if (machine__is_default_guest(machine)) { |
2186 | /* |
2187 | * if the user specified a vmlinux filename, use it and only |
2188 | * it, reporting errors to the user if it cannot be used. |
2189 | * Or use file guest_kallsyms inputted by user on commandline |
2190 | */ |
2191 | if (symbol_conf.default_guest_vmlinux_name != NULL) { |
2192 | err = dso__load_vmlinux(dso, map, |
2193 | symbol_conf.default_guest_vmlinux_name, filter); |
2194 | goto out_try_fixup; |
2195 | } |
2196 | |
2197 | kallsyms_filename = symbol_conf.default_guest_kallsyms; |
2198 | if (!kallsyms_filename) |
2199 | return -1; |
2200 | } else { |
2201 | sprintf(path, "%s/proc/kallsyms", machine->root_dir); |
2202 | kallsyms_filename = path; |
2203 | } |
2204 | |
2205 | err = dso__load_kallsyms(dso, kallsyms_filename, map, filter); |
2206 | if (err > 0) |
2207 | pr_debug("Using %s for symbols\n", kallsyms_filename); |
2208 | |
2209 | out_try_fixup: |
2210 | if (err > 0) { |
2211 | if (kallsyms_filename != NULL) { |
2212 | machine__mmap_name(machine, path, sizeof(path)); |
2213 | dso__set_long_name(dso, strdup(path)); |
2214 | } |
2215 | map__fixup_start(map); |
2216 | map__fixup_end(map); |
2217 | } |
2218 | |
2219 | return err; |
2220 | } |
2221 | |
2222 | static void dsos__add(struct list_head *head, struct dso *dso) |
2223 | { |
2224 | list_add_tail(&dso->node, head); |
2225 | } |
2226 | |
2227 | static struct dso *dsos__find(struct list_head *head, const char *name) |
2228 | { |
2229 | struct dso *pos; |
2230 | |
2231 | list_for_each_entry(pos, head, node) |
2232 | if (strcmp(pos->long_name, name) == 0) |
2233 | return pos; |
2234 | return NULL; |
2235 | } |
2236 | |
2237 | struct dso *__dsos__findnew(struct list_head *head, const char *name) |
2238 | { |
2239 | struct dso *dso = dsos__find(head, name); |
2240 | |
2241 | if (!dso) { |
2242 | dso = dso__new(name); |
2243 | if (dso != NULL) { |
2244 | dsos__add(head, dso); |
2245 | dso__set_basename(dso); |
2246 | } |
2247 | } |
2248 | |
2249 | return dso; |
2250 | } |
2251 | |
2252 | size_t __dsos__fprintf(struct list_head *head, FILE *fp) |
2253 | { |
2254 | struct dso *pos; |
2255 | size_t ret = 0; |
2256 | |
2257 | list_for_each_entry(pos, head, node) { |
2258 | int i; |
2259 | for (i = 0; i < MAP__NR_TYPES; ++i) |
2260 | ret += dso__fprintf(pos, i, fp); |
2261 | } |
2262 | |
2263 | return ret; |
2264 | } |
2265 | |
2266 | size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp) |
2267 | { |
2268 | struct rb_node *nd; |
2269 | size_t ret = 0; |
2270 | |
2271 | for (nd = rb_first(machines); nd; nd = rb_next(nd)) { |
2272 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
2273 | ret += __dsos__fprintf(&pos->kernel_dsos, fp); |
2274 | ret += __dsos__fprintf(&pos->user_dsos, fp); |
2275 | } |
2276 | |
2277 | return ret; |
2278 | } |
2279 | |
2280 | static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp, |
2281 | bool with_hits) |
2282 | { |
2283 | struct dso *pos; |
2284 | size_t ret = 0; |
2285 | |
2286 | list_for_each_entry(pos, head, node) { |
2287 | if (with_hits && !pos->hit) |
2288 | continue; |
2289 | ret += dso__fprintf_buildid(pos, fp); |
2290 | ret += fprintf(fp, " %s\n", pos->long_name); |
2291 | } |
2292 | return ret; |
2293 | } |
2294 | |
2295 | size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp, |
2296 | bool with_hits) |
2297 | { |
2298 | return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) + |
2299 | __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits); |
2300 | } |
2301 | |
2302 | size_t machines__fprintf_dsos_buildid(struct rb_root *machines, |
2303 | FILE *fp, bool with_hits) |
2304 | { |
2305 | struct rb_node *nd; |
2306 | size_t ret = 0; |
2307 | |
2308 | for (nd = rb_first(machines); nd; nd = rb_next(nd)) { |
2309 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
2310 | ret += machine__fprintf_dsos_buildid(pos, fp, with_hits); |
2311 | } |
2312 | return ret; |
2313 | } |
2314 | |
2315 | static struct dso* |
2316 | dso__kernel_findnew(struct machine *machine, const char *name, |
2317 | const char *short_name, int dso_type) |
2318 | { |
2319 | /* |
2320 | * The kernel dso could be created by build_id processing. |
2321 | */ |
2322 | struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name); |
2323 | |
2324 | /* |
2325 | * We need to run this in all cases, since during the build_id |
2326 | * processing we had no idea this was the kernel dso. |
2327 | */ |
2328 | if (dso != NULL) { |
2329 | dso__set_short_name(dso, short_name); |
2330 | dso->kernel = dso_type; |
2331 | } |
2332 | |
2333 | return dso; |
2334 | } |
2335 | |
2336 | void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine) |
2337 | { |
2338 | char path[PATH_MAX]; |
2339 | |
2340 | if (machine__is_default_guest(machine)) |
2341 | return; |
2342 | sprintf(path, "%s/sys/kernel/notes", machine->root_dir); |
2343 | if (sysfs__read_build_id(path, dso->build_id, |
2344 | sizeof(dso->build_id)) == 0) |
2345 | dso->has_build_id = true; |
2346 | } |
2347 | |
2348 | static struct dso *machine__get_kernel(struct machine *machine) |
2349 | { |
2350 | const char *vmlinux_name = NULL; |
2351 | struct dso *kernel; |
2352 | |
2353 | if (machine__is_host(machine)) { |
2354 | vmlinux_name = symbol_conf.vmlinux_name; |
2355 | if (!vmlinux_name) |
2356 | vmlinux_name = "[kernel.kallsyms]"; |
2357 | |
2358 | kernel = dso__kernel_findnew(machine, vmlinux_name, |
2359 | "[kernel]", |
2360 | DSO_TYPE_KERNEL); |
2361 | } else { |
2362 | char bf[PATH_MAX]; |
2363 | |
2364 | if (machine__is_default_guest(machine)) |
2365 | vmlinux_name = symbol_conf.default_guest_vmlinux_name; |
2366 | if (!vmlinux_name) |
2367 | vmlinux_name = machine__mmap_name(machine, bf, |
2368 | sizeof(bf)); |
2369 | |
2370 | kernel = dso__kernel_findnew(machine, vmlinux_name, |
2371 | "[guest.kernel]", |
2372 | DSO_TYPE_GUEST_KERNEL); |
2373 | } |
2374 | |
2375 | if (kernel != NULL && (!kernel->has_build_id)) |
2376 | dso__read_running_kernel_build_id(kernel, machine); |
2377 | |
2378 | return kernel; |
2379 | } |
2380 | |
2381 | struct process_args { |
2382 | u64 start; |
2383 | }; |
2384 | |
2385 | static int symbol__in_kernel(void *arg, const char *name, |
2386 | char type __used, u64 start, u64 end __used) |
2387 | { |
2388 | struct process_args *args = arg; |
2389 | |
2390 | if (strchr(name, '[')) |
2391 | return 0; |
2392 | |
2393 | args->start = start; |
2394 | return 1; |
2395 | } |
2396 | |
2397 | /* Figure out the start address of kernel map from /proc/kallsyms */ |
2398 | static u64 machine__get_kernel_start_addr(struct machine *machine) |
2399 | { |
2400 | const char *filename; |
2401 | char path[PATH_MAX]; |
2402 | struct process_args args; |
2403 | |
2404 | if (machine__is_host(machine)) { |
2405 | filename = "/proc/kallsyms"; |
2406 | } else { |
2407 | if (machine__is_default_guest(machine)) |
2408 | filename = (char *)symbol_conf.default_guest_kallsyms; |
2409 | else { |
2410 | sprintf(path, "%s/proc/kallsyms", machine->root_dir); |
2411 | filename = path; |
2412 | } |
2413 | } |
2414 | |
2415 | if (symbol__restricted_filename(filename, "/proc/kallsyms")) |
2416 | return 0; |
2417 | |
2418 | if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0) |
2419 | return 0; |
2420 | |
2421 | return args.start; |
2422 | } |
2423 | |
2424 | int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel) |
2425 | { |
2426 | enum map_type type; |
2427 | u64 start = machine__get_kernel_start_addr(machine); |
2428 | |
2429 | for (type = 0; type < MAP__NR_TYPES; ++type) { |
2430 | struct kmap *kmap; |
2431 | |
2432 | machine->vmlinux_maps[type] = map__new2(start, kernel, type); |
2433 | if (machine->vmlinux_maps[type] == NULL) |
2434 | return -1; |
2435 | |
2436 | machine->vmlinux_maps[type]->map_ip = |
2437 | machine->vmlinux_maps[type]->unmap_ip = |
2438 | identity__map_ip; |
2439 | kmap = map__kmap(machine->vmlinux_maps[type]); |
2440 | kmap->kmaps = &machine->kmaps; |
2441 | map_groups__insert(&machine->kmaps, |
2442 | machine->vmlinux_maps[type]); |
2443 | } |
2444 | |
2445 | return 0; |
2446 | } |
2447 | |
2448 | void machine__destroy_kernel_maps(struct machine *machine) |
2449 | { |
2450 | enum map_type type; |
2451 | |
2452 | for (type = 0; type < MAP__NR_TYPES; ++type) { |
2453 | struct kmap *kmap; |
2454 | |
2455 | if (machine->vmlinux_maps[type] == NULL) |
2456 | continue; |
2457 | |
2458 | kmap = map__kmap(machine->vmlinux_maps[type]); |
2459 | map_groups__remove(&machine->kmaps, |
2460 | machine->vmlinux_maps[type]); |
2461 | if (kmap->ref_reloc_sym) { |
2462 | /* |
2463 | * ref_reloc_sym is shared among all maps, so free just |
2464 | * on one of them. |
2465 | */ |
2466 | if (type == MAP__FUNCTION) { |
2467 | free((char *)kmap->ref_reloc_sym->name); |
2468 | kmap->ref_reloc_sym->name = NULL; |
2469 | free(kmap->ref_reloc_sym); |
2470 | } |
2471 | kmap->ref_reloc_sym = NULL; |
2472 | } |
2473 | |
2474 | map__delete(machine->vmlinux_maps[type]); |
2475 | machine->vmlinux_maps[type] = NULL; |
2476 | } |
2477 | } |
2478 | |
2479 | int machine__create_kernel_maps(struct machine *machine) |
2480 | { |
2481 | struct dso *kernel = machine__get_kernel(machine); |
2482 | |
2483 | if (kernel == NULL || |
2484 | __machine__create_kernel_maps(machine, kernel) < 0) |
2485 | return -1; |
2486 | |
2487 | if (symbol_conf.use_modules && machine__create_modules(machine) < 0) |
2488 | pr_debug("Problems creating module maps, continuing anyway...\n"); |
2489 | /* |
2490 | * Now that we have all the maps created, just set the ->end of them: |
2491 | */ |
2492 | map_groups__fixup_end(&machine->kmaps); |
2493 | return 0; |
2494 | } |
2495 | |
2496 | static void vmlinux_path__exit(void) |
2497 | { |
2498 | while (--vmlinux_path__nr_entries >= 0) { |
2499 | free(vmlinux_path[vmlinux_path__nr_entries]); |
2500 | vmlinux_path[vmlinux_path__nr_entries] = NULL; |
2501 | } |
2502 | |
2503 | free(vmlinux_path); |
2504 | vmlinux_path = NULL; |
2505 | } |
2506 | |
2507 | static int vmlinux_path__init(void) |
2508 | { |
2509 | struct utsname uts; |
2510 | char bf[PATH_MAX]; |
2511 | |
2512 | vmlinux_path = malloc(sizeof(char *) * 5); |
2513 | if (vmlinux_path == NULL) |
2514 | return -1; |
2515 | |
2516 | vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux"); |
2517 | if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
2518 | goto out_fail; |
2519 | ++vmlinux_path__nr_entries; |
2520 | vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux"); |
2521 | if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
2522 | goto out_fail; |
2523 | ++vmlinux_path__nr_entries; |
2524 | |
2525 | /* only try running kernel version if no symfs was given */ |
2526 | if (symbol_conf.symfs[0] != 0) |
2527 | return 0; |
2528 | |
2529 | if (uname(&uts) < 0) |
2530 | return -1; |
2531 | |
2532 | snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release); |
2533 | vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); |
2534 | if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
2535 | goto out_fail; |
2536 | ++vmlinux_path__nr_entries; |
2537 | snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release); |
2538 | vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); |
2539 | if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
2540 | goto out_fail; |
2541 | ++vmlinux_path__nr_entries; |
2542 | snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux", |
2543 | uts.release); |
2544 | vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); |
2545 | if (vmlinux_path[vmlinux_path__nr_entries] == NULL) |
2546 | goto out_fail; |
2547 | ++vmlinux_path__nr_entries; |
2548 | |
2549 | return 0; |
2550 | |
2551 | out_fail: |
2552 | vmlinux_path__exit(); |
2553 | return -1; |
2554 | } |
2555 | |
2556 | size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp) |
2557 | { |
2558 | int i; |
2559 | size_t printed = 0; |
2560 | struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso; |
2561 | |
2562 | if (kdso->has_build_id) { |
2563 | char filename[PATH_MAX]; |
2564 | if (dso__build_id_filename(kdso, filename, sizeof(filename))) |
2565 | printed += fprintf(fp, "[0] %s\n", filename); |
2566 | } |
2567 | |
2568 | for (i = 0; i < vmlinux_path__nr_entries; ++i) |
2569 | printed += fprintf(fp, "[%d] %s\n", |
2570 | i + kdso->has_build_id, vmlinux_path[i]); |
2571 | |
2572 | return printed; |
2573 | } |
2574 | |
2575 | static int setup_list(struct strlist **list, const char *list_str, |
2576 | const char *list_name) |
2577 | { |
2578 | if (list_str == NULL) |
2579 | return 0; |
2580 | |
2581 | *list = strlist__new(true, list_str); |
2582 | if (!*list) { |
2583 | pr_err("problems parsing %s list\n", list_name); |
2584 | return -1; |
2585 | } |
2586 | return 0; |
2587 | } |
2588 | |
2589 | static bool symbol__read_kptr_restrict(void) |
2590 | { |
2591 | bool value = false; |
2592 | |
2593 | if (geteuid() != 0) { |
2594 | FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); |
2595 | if (fp != NULL) { |
2596 | char line[8]; |
2597 | |
2598 | if (fgets(line, sizeof(line), fp) != NULL) |
2599 | value = atoi(line) != 0; |
2600 | |
2601 | fclose(fp); |
2602 | } |
2603 | } |
2604 | |
2605 | return value; |
2606 | } |
2607 | |
2608 | int symbol__init(void) |
2609 | { |
2610 | const char *symfs; |
2611 | |
2612 | if (symbol_conf.initialized) |
2613 | return 0; |
2614 | |
2615 | symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64)); |
2616 | |
2617 | elf_version(EV_CURRENT); |
2618 | if (symbol_conf.sort_by_name) |
2619 | symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - |
2620 | sizeof(struct symbol)); |
2621 | |
2622 | if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0) |
2623 | return -1; |
2624 | |
2625 | if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { |
2626 | pr_err("'.' is the only non valid --field-separator argument\n"); |
2627 | return -1; |
2628 | } |
2629 | |
2630 | if (setup_list(&symbol_conf.dso_list, |
2631 | symbol_conf.dso_list_str, "dso") < 0) |
2632 | return -1; |
2633 | |
2634 | if (setup_list(&symbol_conf.comm_list, |
2635 | symbol_conf.comm_list_str, "comm") < 0) |
2636 | goto out_free_dso_list; |
2637 | |
2638 | if (setup_list(&symbol_conf.sym_list, |
2639 | symbol_conf.sym_list_str, "symbol") < 0) |
2640 | goto out_free_comm_list; |
2641 | |
2642 | /* |
2643 | * A path to symbols of "/" is identical to "" |
2644 | * reset here for simplicity. |
2645 | */ |
2646 | symfs = realpath(symbol_conf.symfs, NULL); |
2647 | if (symfs == NULL) |
2648 | symfs = symbol_conf.symfs; |
2649 | if (strcmp(symfs, "/") == 0) |
2650 | symbol_conf.symfs = ""; |
2651 | if (symfs != symbol_conf.symfs) |
2652 | free((void *)symfs); |
2653 | |
2654 | symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); |
2655 | |
2656 | symbol_conf.initialized = true; |
2657 | return 0; |
2658 | |
2659 | out_free_comm_list: |
2660 | strlist__delete(symbol_conf.comm_list); |
2661 | out_free_dso_list: |
2662 | strlist__delete(symbol_conf.dso_list); |
2663 | return -1; |
2664 | } |
2665 | |
2666 | void symbol__exit(void) |
2667 | { |
2668 | if (!symbol_conf.initialized) |
2669 | return; |
2670 | strlist__delete(symbol_conf.sym_list); |
2671 | strlist__delete(symbol_conf.dso_list); |
2672 | strlist__delete(symbol_conf.comm_list); |
2673 | vmlinux_path__exit(); |
2674 | symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; |
2675 | symbol_conf.initialized = false; |
2676 | } |
2677 | |
2678 | int machines__create_kernel_maps(struct rb_root *machines, pid_t pid) |
2679 | { |
2680 | struct machine *machine = machines__findnew(machines, pid); |
2681 | |
2682 | if (machine == NULL) |
2683 | return -1; |
2684 | |
2685 | return machine__create_kernel_maps(machine); |
2686 | } |
2687 | |
2688 | static int hex(char ch) |
2689 | { |
2690 | if ((ch >= '0') && (ch <= '9')) |
2691 | return ch - '0'; |
2692 | if ((ch >= 'a') && (ch <= 'f')) |
2693 | return ch - 'a' + 10; |
2694 | if ((ch >= 'A') && (ch <= 'F')) |
2695 | return ch - 'A' + 10; |
2696 | return -1; |
2697 | } |
2698 | |
2699 | /* |
2700 | * While we find nice hex chars, build a long_val. |
2701 | * Return number of chars processed. |
2702 | */ |
2703 | int hex2u64(const char *ptr, u64 *long_val) |
2704 | { |
2705 | const char *p = ptr; |
2706 | *long_val = 0; |
2707 | |
2708 | while (*p) { |
2709 | const int hex_val = hex(*p); |
2710 | |
2711 | if (hex_val < 0) |
2712 | break; |
2713 | |
2714 | *long_val = (*long_val << 4) | hex_val; |
2715 | p++; |
2716 | } |
2717 | |
2718 | return p - ptr; |
2719 | } |
2720 | |
2721 | char *strxfrchar(char *s, char from, char to) |
2722 | { |
2723 | char *p = s; |
2724 | |
2725 | while ((p = strchr(p, from)) != NULL) |
2726 | *p++ = to; |
2727 | |
2728 | return s; |
2729 | } |
2730 | |
2731 | int machines__create_guest_kernel_maps(struct rb_root *machines) |
2732 | { |
2733 | int ret = 0; |
2734 | struct dirent **namelist = NULL; |
2735 | int i, items = 0; |
2736 | char path[PATH_MAX]; |
2737 | pid_t pid; |
2738 | |
2739 | if (symbol_conf.default_guest_vmlinux_name || |
2740 | symbol_conf.default_guest_modules || |
2741 | symbol_conf.default_guest_kallsyms) { |
2742 | machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID); |
2743 | } |
2744 | |
2745 | if (symbol_conf.guestmount) { |
2746 | items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL); |
2747 | if (items <= 0) |
2748 | return -ENOENT; |
2749 | for (i = 0; i < items; i++) { |
2750 | if (!isdigit(namelist[i]->d_name[0])) { |
2751 | /* Filter out . and .. */ |
2752 | continue; |
2753 | } |
2754 | pid = atoi(namelist[i]->d_name); |
2755 | sprintf(path, "%s/%s/proc/kallsyms", |
2756 | symbol_conf.guestmount, |
2757 | namelist[i]->d_name); |
2758 | ret = access(path, R_OK); |
2759 | if (ret) { |
2760 | pr_debug("Can't access file %s\n", path); |
2761 | goto failure; |
2762 | } |
2763 | machines__create_kernel_maps(machines, pid); |
2764 | } |
2765 | failure: |
2766 | free(namelist); |
2767 | } |
2768 | |
2769 | return ret; |
2770 | } |
2771 | |
2772 | void machines__destroy_guest_kernel_maps(struct rb_root *machines) |
2773 | { |
2774 | struct rb_node *next = rb_first(machines); |
2775 | |
2776 | while (next) { |
2777 | struct machine *pos = rb_entry(next, struct machine, rb_node); |
2778 | |
2779 | next = rb_next(&pos->rb_node); |
2780 | rb_erase(&pos->rb_node, machines); |
2781 | machine__delete(pos); |
2782 | } |
2783 | } |
2784 | |
2785 | int machine__load_kallsyms(struct machine *machine, const char *filename, |
2786 | enum map_type type, symbol_filter_t filter) |
2787 | { |
2788 | struct map *map = machine->vmlinux_maps[type]; |
2789 | int ret = dso__load_kallsyms(map->dso, filename, map, filter); |
2790 | |
2791 | if (ret > 0) { |
2792 | dso__set_loaded(map->dso, type); |
2793 | /* |
2794 | * Since /proc/kallsyms will have multiple sessions for the |
2795 | * kernel, with modules between them, fixup the end of all |
2796 | * sections. |
2797 | */ |
2798 | __map_groups__fixup_end(&machine->kmaps, type); |
2799 | } |
2800 | |
2801 | return ret; |
2802 | } |
2803 | |
2804 | int machine__load_vmlinux_path(struct machine *machine, enum map_type type, |
2805 | symbol_filter_t filter) |
2806 | { |
2807 | struct map *map = machine->vmlinux_maps[type]; |
2808 | int ret = dso__load_vmlinux_path(map->dso, map, filter); |
2809 | |
2810 | if (ret > 0) { |
2811 | dso__set_loaded(map->dso, type); |
2812 | map__reloc_vmlinux(map); |
2813 | } |
2814 | |
2815 | return ret; |
2816 | } |
2817 | |
2818 | struct map *dso__new_map(const char *name) |
2819 | { |
2820 | struct map *map = NULL; |
2821 | struct dso *dso = dso__new(name); |
2822 | |
2823 | if (dso) |
2824 | map = map__new2(0, dso, MAP__FUNCTION); |
2825 | |
2826 | return map; |
2827 | } |
2828 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9