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ieee802154: verify packet size before trying to allocate it
[linux/fpc-iii.git] / tools / perf / util / symbol.c
blob3e2e5ea0f03f692c41f62e8aeb1f5d3382c86ce1
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 }
Linux with added FPC-III support