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perf symbols: Follow .gnu_debuglink section to find separate symbols
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / tools / perf / util / symbol.c
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 static int filename__read_debuglink(const char *filename,
1594 char *debuglink, size_t size)
1595 {
1596 int fd, err = -1;
1597 Elf *elf;
1598 GElf_Ehdr ehdr;
1599 GElf_Shdr shdr;
1600 Elf_Data *data;
1601 Elf_Scn *sec;
1602 Elf_Kind ek;
1603
1604 fd = open(filename, O_RDONLY);
1605 if (fd < 0)
1606 goto out;
1607
1608 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1609 if (elf == NULL) {
1610 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1611 goto out_close;
1612 }
1613
1614 ek = elf_kind(elf);
1615 if (ek != ELF_K_ELF)
1616 goto out_close;
1617
1618 if (gelf_getehdr(elf, &ehdr) == NULL) {
1619 pr_err("%s: cannot get elf header.\n", __func__);
1620 goto out_close;
1621 }
1622
1623 sec = elf_section_by_name(elf, &ehdr, &shdr,
1624 ".gnu_debuglink", NULL);
1625 if (sec == NULL)
1626 goto out_close;
1627
1628 data = elf_getdata(sec, NULL);
1629 if (data == NULL)
1630 goto out_close;
1631
1632 /* the start of this section is a zero-terminated string */
1633 strncpy(debuglink, data->d_buf, size);
1634
1635 elf_end(elf);
1636
1637 out_close:
1638 close(fd);
1639 out:
1640 return err;
1641 }
1642
1643 char dso__symtab_origin(const struct dso *dso)
1644 {
1645 static const char origin[] = {
1646 [SYMTAB__KALLSYMS] = 'k',
1647 [SYMTAB__JAVA_JIT] = 'j',
1648 [SYMTAB__DEBUGLINK] = 'l',
1649 [SYMTAB__BUILD_ID_CACHE] = 'B',
1650 [SYMTAB__FEDORA_DEBUGINFO] = 'f',
1651 [SYMTAB__UBUNTU_DEBUGINFO] = 'u',
1652 [SYMTAB__BUILDID_DEBUGINFO] = 'b',
1653 [SYMTAB__SYSTEM_PATH_DSO] = 'd',
1654 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1655 [SYMTAB__GUEST_KALLSYMS] = 'g',
1656 [SYMTAB__GUEST_KMODULE] = 'G',
1657 };
1658
1659 if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1660 return '!';
1661 return origin[dso->symtab_type];
1662 }
1663
1664 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1665 {
1666 int size = PATH_MAX;
1667 char *name;
1668 int ret = -1;
1669 int fd;
1670 struct machine *machine;
1671 const char *root_dir;
1672 int want_symtab;
1673
1674 dso__set_loaded(dso, map->type);
1675
1676 if (dso->kernel == DSO_TYPE_KERNEL)
1677 return dso__load_kernel_sym(dso, map, filter);
1678 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1679 return dso__load_guest_kernel_sym(dso, map, filter);
1680
1681 if (map->groups && map->groups->machine)
1682 machine = map->groups->machine;
1683 else
1684 machine = NULL;
1685
1686 name = malloc(size);
1687 if (!name)
1688 return -1;
1689
1690 dso->adjust_symbols = 0;
1691
1692 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1693 struct stat st;
1694
1695 if (lstat(dso->name, &st) < 0)
1696 return -1;
1697
1698 if (st.st_uid && (st.st_uid != geteuid())) {
1699 pr_warning("File %s not owned by current user or root, "
1700 "ignoring it.\n", dso->name);
1701 return -1;
1702 }
1703
1704 ret = dso__load_perf_map(dso, map, filter);
1705 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1706 SYMTAB__NOT_FOUND;
1707 return ret;
1708 }
1709
1710 /* Iterate over candidate debug images.
1711 * On the first pass, only load images if they have a full symtab.
1712 * Failing that, do a second pass where we accept .dynsym also
1713 */
1714 want_symtab = 1;
1715 restart:
1716 for (dso->symtab_type = SYMTAB__DEBUGLINK;
1717 dso->symtab_type != SYMTAB__NOT_FOUND;
1718 dso->symtab_type++) {
1719 switch (dso->symtab_type) {
1720 case SYMTAB__DEBUGLINK: {
1721 char *debuglink;
1722 strncpy(name, dso->long_name, size);
1723 debuglink = name + dso->long_name_len;
1724 while (debuglink != name && *debuglink != '/')
1725 debuglink--;
1726 if (*debuglink == '/')
1727 debuglink++;
1728 filename__read_debuglink(dso->long_name, debuglink,
1729 size - (debuglink - name));
1730 }
1731 break;
1732 case SYMTAB__BUILD_ID_CACHE:
1733 /* skip the locally configured cache if a symfs is given */
1734 if (symbol_conf.symfs[0] ||
1735 (dso__build_id_filename(dso, name, size) == NULL)) {
1736 continue;
1737 }
1738 break;
1739 case SYMTAB__FEDORA_DEBUGINFO:
1740 snprintf(name, size, "%s/usr/lib/debug%s.debug",
1741 symbol_conf.symfs, dso->long_name);
1742 break;
1743 case SYMTAB__UBUNTU_DEBUGINFO:
1744 snprintf(name, size, "%s/usr/lib/debug%s",
1745 symbol_conf.symfs, dso->long_name);
1746 break;
1747 case SYMTAB__BUILDID_DEBUGINFO: {
1748 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1749
1750 if (!dso->has_build_id)
1751 continue;
1752
1753 build_id__sprintf(dso->build_id,
1754 sizeof(dso->build_id),
1755 build_id_hex);
1756 snprintf(name, size,
1757 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1758 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1759 }
1760 break;
1761 case SYMTAB__SYSTEM_PATH_DSO:
1762 snprintf(name, size, "%s%s",
1763 symbol_conf.symfs, dso->long_name);
1764 break;
1765 case SYMTAB__GUEST_KMODULE:
1766 if (map->groups && machine)
1767 root_dir = machine->root_dir;
1768 else
1769 root_dir = "";
1770 snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1771 root_dir, dso->long_name);
1772 break;
1773
1774 case SYMTAB__SYSTEM_PATH_KMODULE:
1775 snprintf(name, size, "%s%s", symbol_conf.symfs,
1776 dso->long_name);
1777 break;
1778 default:;
1779 }
1780
1781 /* Name is now the name of the next image to try */
1782 fd = open(name, O_RDONLY);
1783 if (fd < 0)
1784 continue;
1785
1786 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1787 want_symtab);
1788 close(fd);
1789
1790 /*
1791 * Some people seem to have debuginfo files _WITHOUT_ debug
1792 * info!?!?
1793 */
1794 if (!ret)
1795 continue;
1796
1797 if (ret > 0) {
1798 int nr_plt;
1799
1800 nr_plt = dso__synthesize_plt_symbols(dso, name, map, filter);
1801 if (nr_plt > 0)
1802 ret += nr_plt;
1803 break;
1804 }
1805 }
1806
1807 /*
1808 * If we wanted a full symtab but no image had one,
1809 * relax our requirements and repeat the search.
1810 */
1811 if (ret <= 0 && want_symtab) {
1812 want_symtab = 0;
1813 goto restart;
1814 }
1815
1816 free(name);
1817 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1818 return 0;
1819 return ret;
1820 }
1821
1822 struct map *map_groups__find_by_name(struct map_groups *mg,
1823 enum map_type type, const char *name)
1824 {
1825 struct rb_node *nd;
1826
1827 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1828 struct map *map = rb_entry(nd, struct map, rb_node);
1829
1830 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1831 return map;
1832 }
1833
1834 return NULL;
1835 }
1836
1837 static int dso__kernel_module_get_build_id(struct dso *dso,
1838 const char *root_dir)
1839 {
1840 char filename[PATH_MAX];
1841 /*
1842 * kernel module short names are of the form "[module]" and
1843 * we need just "module" here.
1844 */
1845 const char *name = dso->short_name + 1;
1846
1847 snprintf(filename, sizeof(filename),
1848 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1849 root_dir, (int)strlen(name) - 1, name);
1850
1851 if (sysfs__read_build_id(filename, dso->build_id,
1852 sizeof(dso->build_id)) == 0)
1853 dso->has_build_id = true;
1854
1855 return 0;
1856 }
1857
1858 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1859 const char *dir_name)
1860 {
1861 struct dirent *dent;
1862 DIR *dir = opendir(dir_name);
1863 int ret = 0;
1864
1865 if (!dir) {
1866 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1867 return -1;
1868 }
1869
1870 while ((dent = readdir(dir)) != NULL) {
1871 char path[PATH_MAX];
1872 struct stat st;
1873
1874 /*sshfs might return bad dent->d_type, so we have to stat*/
1875 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
1876 if (stat(path, &st))
1877 continue;
1878
1879 if (S_ISDIR(st.st_mode)) {
1880 if (!strcmp(dent->d_name, ".") ||
1881 !strcmp(dent->d_name, ".."))
1882 continue;
1883
1884 ret = map_groups__set_modules_path_dir(mg, path);
1885 if (ret < 0)
1886 goto out;
1887 } else {
1888 char *dot = strrchr(dent->d_name, '.'),
1889 dso_name[PATH_MAX];
1890 struct map *map;
1891 char *long_name;
1892
1893 if (dot == NULL || strcmp(dot, ".ko"))
1894 continue;
1895 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1896 (int)(dot - dent->d_name), dent->d_name);
1897
1898 strxfrchar(dso_name, '-', '_');
1899 map = map_groups__find_by_name(mg, MAP__FUNCTION,
1900 dso_name);
1901 if (map == NULL)
1902 continue;
1903
1904 long_name = strdup(path);
1905 if (long_name == NULL) {
1906 ret = -1;
1907 goto out;
1908 }
1909 dso__set_long_name(map->dso, long_name);
1910 map->dso->lname_alloc = 1;
1911 dso__kernel_module_get_build_id(map->dso, "");
1912 }
1913 }
1914
1915 out:
1916 closedir(dir);
1917 return ret;
1918 }
1919
1920 static char *get_kernel_version(const char *root_dir)
1921 {
1922 char version[PATH_MAX];
1923 FILE *file;
1924 char *name, *tmp;
1925 const char *prefix = "Linux version ";
1926
1927 sprintf(version, "%s/proc/version", root_dir);
1928 file = fopen(version, "r");
1929 if (!file)
1930 return NULL;
1931
1932 version[0] = '\0';
1933 tmp = fgets(version, sizeof(version), file);
1934 fclose(file);
1935
1936 name = strstr(version, prefix);
1937 if (!name)
1938 return NULL;
1939 name += strlen(prefix);
1940 tmp = strchr(name, ' ');
1941 if (tmp)
1942 *tmp = '\0';
1943
1944 return strdup(name);
1945 }
1946
1947 static int machine__set_modules_path(struct machine *machine)
1948 {
1949 char *version;
1950 char modules_path[PATH_MAX];
1951
1952 version = get_kernel_version(machine->root_dir);
1953 if (!version)
1954 return -1;
1955
1956 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1957 machine->root_dir, version);
1958 free(version);
1959
1960 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1961 }
1962
1963 /*
1964 * Constructor variant for modules (where we know from /proc/modules where
1965 * they are loaded) and for vmlinux, where only after we load all the
1966 * symbols we'll know where it starts and ends.
1967 */
1968 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1969 {
1970 struct map *map = calloc(1, (sizeof(*map) +
1971 (dso->kernel ? sizeof(struct kmap) : 0)));
1972 if (map != NULL) {
1973 /*
1974 * ->end will be filled after we load all the symbols
1975 */
1976 map__init(map, type, start, 0, 0, dso);
1977 }
1978
1979 return map;
1980 }
1981
1982 struct map *machine__new_module(struct machine *machine, u64 start,
1983 const char *filename)
1984 {
1985 struct map *map;
1986 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
1987
1988 if (dso == NULL)
1989 return NULL;
1990
1991 map = map__new2(start, dso, MAP__FUNCTION);
1992 if (map == NULL)
1993 return NULL;
1994
1995 if (machine__is_host(machine))
1996 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1997 else
1998 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1999 map_groups__insert(&machine->kmaps, map);
2000 return map;
2001 }
2002
2003 static int machine__create_modules(struct machine *machine)
2004 {
2005 char *line = NULL;
2006 size_t n;
2007 FILE *file;
2008 struct map *map;
2009 const char *modules;
2010 char path[PATH_MAX];
2011
2012 if (machine__is_default_guest(machine))
2013 modules = symbol_conf.default_guest_modules;
2014 else {
2015 sprintf(path, "%s/proc/modules", machine->root_dir);
2016 modules = path;
2017 }
2018
2019 if (symbol__restricted_filename(path, "/proc/modules"))
2020 return -1;
2021
2022 file = fopen(modules, "r");
2023 if (file == NULL)
2024 return -1;
2025
2026 while (!feof(file)) {
2027 char name[PATH_MAX];
2028 u64 start;
2029 char *sep;
2030 int line_len;
2031
2032 line_len = getline(&line, &n, file);
2033 if (line_len < 0)
2034 break;
2035
2036 if (!line)
2037 goto out_failure;
2038
2039 line[--line_len] = '\0'; /* \n */
2040
2041 sep = strrchr(line, 'x');
2042 if (sep == NULL)
2043 continue;
2044
2045 hex2u64(sep + 1, &start);
2046
2047 sep = strchr(line, ' ');
2048 if (sep == NULL)
2049 continue;
2050
2051 *sep = '\0';
2052
2053 snprintf(name, sizeof(name), "[%s]", line);
2054 map = machine__new_module(machine, start, name);
2055 if (map == NULL)
2056 goto out_delete_line;
2057 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
2058 }
2059
2060 free(line);
2061 fclose(file);
2062
2063 return machine__set_modules_path(machine);
2064
2065 out_delete_line:
2066 free(line);
2067 out_failure:
2068 return -1;
2069 }
2070
2071 int dso__load_vmlinux(struct dso *dso, struct map *map,
2072 const char *vmlinux, symbol_filter_t filter)
2073 {
2074 int err = -1, fd;
2075 char symfs_vmlinux[PATH_MAX];
2076
2077 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
2078 symbol_conf.symfs, vmlinux);
2079 fd = open(symfs_vmlinux, O_RDONLY);
2080 if (fd < 0)
2081 return -1;
2082
2083 dso__set_long_name(dso, (char *)vmlinux);
2084 dso__set_loaded(dso, map->type);
2085 err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
2086 close(fd);
2087
2088 if (err > 0)
2089 pr_debug("Using %s for symbols\n", symfs_vmlinux);
2090
2091 return err;
2092 }
2093
2094 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
2095 symbol_filter_t filter)
2096 {
2097 int i, err = 0;
2098 char *filename;
2099
2100 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
2101 vmlinux_path__nr_entries + 1);
2102
2103 filename = dso__build_id_filename(dso, NULL, 0);
2104 if (filename != NULL) {
2105 err = dso__load_vmlinux(dso, map, filename, filter);
2106 if (err > 0) {
2107 dso__set_long_name(dso, filename);
2108 goto out;
2109 }
2110 free(filename);
2111 }
2112
2113 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
2114 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
2115 if (err > 0) {
2116 dso__set_long_name(dso, strdup(vmlinux_path[i]));
2117 break;
2118 }
2119 }
2120 out:
2121 return err;
2122 }
2123
2124 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
2125 symbol_filter_t filter)
2126 {
2127 int err;
2128 const char *kallsyms_filename = NULL;
2129 char *kallsyms_allocated_filename = NULL;
2130 /*
2131 * Step 1: if the user specified a kallsyms or vmlinux filename, use
2132 * it and only it, reporting errors to the user if it cannot be used.
2133 *
2134 * For instance, try to analyse an ARM perf.data file _without_ a
2135 * build-id, or if the user specifies the wrong path to the right
2136 * vmlinux file, obviously we can't fallback to another vmlinux (a
2137 * x86_86 one, on the machine where analysis is being performed, say),
2138 * or worse, /proc/kallsyms.
2139 *
2140 * If the specified file _has_ a build-id and there is a build-id
2141 * section in the perf.data file, we will still do the expected
2142 * validation in dso__load_vmlinux and will bail out if they don't
2143 * match.
2144 */
2145 if (symbol_conf.kallsyms_name != NULL) {
2146 kallsyms_filename = symbol_conf.kallsyms_name;
2147 goto do_kallsyms;
2148 }
2149
2150 if (symbol_conf.vmlinux_name != NULL) {
2151 err = dso__load_vmlinux(dso, map,
2152 symbol_conf.vmlinux_name, filter);
2153 if (err > 0) {
2154 dso__set_long_name(dso,
2155 strdup(symbol_conf.vmlinux_name));
2156 goto out_fixup;
2157 }
2158 return err;
2159 }
2160
2161 if (vmlinux_path != NULL) {
2162 err = dso__load_vmlinux_path(dso, map, filter);
2163 if (err > 0)
2164 goto out_fixup;
2165 }
2166
2167 /* do not try local files if a symfs was given */
2168 if (symbol_conf.symfs[0] != 0)
2169 return -1;
2170
2171 /*
2172 * Say the kernel DSO was created when processing the build-id header table,
2173 * we have a build-id, so check if it is the same as the running kernel,
2174 * using it if it is.
2175 */
2176 if (dso->has_build_id) {
2177 u8 kallsyms_build_id[BUILD_ID_SIZE];
2178 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
2179
2180 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
2181 sizeof(kallsyms_build_id)) == 0) {
2182 if (dso__build_id_equal(dso, kallsyms_build_id)) {
2183 kallsyms_filename = "/proc/kallsyms";
2184 goto do_kallsyms;
2185 }
2186 }
2187 /*
2188 * Now look if we have it on the build-id cache in
2189 * $HOME/.debug/[kernel.kallsyms].
2190 */
2191 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
2192 sbuild_id);
2193
2194 if (asprintf(&kallsyms_allocated_filename,
2195 "%s/.debug/[kernel.kallsyms]/%s",
2196 getenv("HOME"), sbuild_id) == -1) {
2197 pr_err("Not enough memory for kallsyms file lookup\n");
2198 return -1;
2199 }
2200
2201 kallsyms_filename = kallsyms_allocated_filename;
2202
2203 if (access(kallsyms_filename, F_OK)) {
2204 pr_err("No kallsyms or vmlinux with build-id %s "
2205 "was found\n", sbuild_id);
2206 free(kallsyms_allocated_filename);
2207 return -1;
2208 }
2209 } else {
2210 /*
2211 * Last resort, if we don't have a build-id and couldn't find
2212 * any vmlinux file, try the running kernel kallsyms table.
2213 */
2214 kallsyms_filename = "/proc/kallsyms";
2215 }
2216
2217 do_kallsyms:
2218 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2219 if (err > 0)
2220 pr_debug("Using %s for symbols\n", kallsyms_filename);
2221 free(kallsyms_allocated_filename);
2222
2223 if (err > 0) {
2224 out_fixup:
2225 if (kallsyms_filename != NULL)
2226 dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2227 map__fixup_start(map);
2228 map__fixup_end(map);
2229 }
2230
2231 return err;
2232 }
2233
2234 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2235 symbol_filter_t filter)
2236 {
2237 int err;
2238 const char *kallsyms_filename = NULL;
2239 struct machine *machine;
2240 char path[PATH_MAX];
2241
2242 if (!map->groups) {
2243 pr_debug("Guest kernel map hasn't the point to groups\n");
2244 return -1;
2245 }
2246 machine = map->groups->machine;
2247
2248 if (machine__is_default_guest(machine)) {
2249 /*
2250 * if the user specified a vmlinux filename, use it and only
2251 * it, reporting errors to the user if it cannot be used.
2252 * Or use file guest_kallsyms inputted by user on commandline
2253 */
2254 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2255 err = dso__load_vmlinux(dso, map,
2256 symbol_conf.default_guest_vmlinux_name, filter);
2257 goto out_try_fixup;
2258 }
2259
2260 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2261 if (!kallsyms_filename)
2262 return -1;
2263 } else {
2264 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2265 kallsyms_filename = path;
2266 }
2267
2268 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2269 if (err > 0)
2270 pr_debug("Using %s for symbols\n", kallsyms_filename);
2271
2272 out_try_fixup:
2273 if (err > 0) {
2274 if (kallsyms_filename != NULL) {
2275 machine__mmap_name(machine, path, sizeof(path));
2276 dso__set_long_name(dso, strdup(path));
2277 }
2278 map__fixup_start(map);
2279 map__fixup_end(map);
2280 }
2281
2282 return err;
2283 }
2284
2285 static void dsos__add(struct list_head *head, struct dso *dso)
2286 {
2287 list_add_tail(&dso->node, head);
2288 }
2289
2290 static struct dso *dsos__find(struct list_head *head, const char *name)
2291 {
2292 struct dso *pos;
2293
2294 list_for_each_entry(pos, head, node)
2295 if (strcmp(pos->long_name, name) == 0)
2296 return pos;
2297 return NULL;
2298 }
2299
2300 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2301 {
2302 struct dso *dso = dsos__find(head, name);
2303
2304 if (!dso) {
2305 dso = dso__new(name);
2306 if (dso != NULL) {
2307 dsos__add(head, dso);
2308 dso__set_basename(dso);
2309 }
2310 }
2311
2312 return dso;
2313 }
2314
2315 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2316 {
2317 struct dso *pos;
2318 size_t ret = 0;
2319
2320 list_for_each_entry(pos, head, node) {
2321 int i;
2322 for (i = 0; i < MAP__NR_TYPES; ++i)
2323 ret += dso__fprintf(pos, i, fp);
2324 }
2325
2326 return ret;
2327 }
2328
2329 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2330 {
2331 struct rb_node *nd;
2332 size_t ret = 0;
2333
2334 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2335 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2336 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2337 ret += __dsos__fprintf(&pos->user_dsos, fp);
2338 }
2339
2340 return ret;
2341 }
2342
2343 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2344 bool with_hits)
2345 {
2346 struct dso *pos;
2347 size_t ret = 0;
2348
2349 list_for_each_entry(pos, head, node) {
2350 if (with_hits && !pos->hit)
2351 continue;
2352 ret += dso__fprintf_buildid(pos, fp);
2353 ret += fprintf(fp, " %s\n", pos->long_name);
2354 }
2355 return ret;
2356 }
2357
2358 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2359 bool with_hits)
2360 {
2361 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2362 __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2363 }
2364
2365 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2366 FILE *fp, bool with_hits)
2367 {
2368 struct rb_node *nd;
2369 size_t ret = 0;
2370
2371 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2372 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2373 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2374 }
2375 return ret;
2376 }
2377
2378 static struct dso*
2379 dso__kernel_findnew(struct machine *machine, const char *name,
2380 const char *short_name, int dso_type)
2381 {
2382 /*
2383 * The kernel dso could be created by build_id processing.
2384 */
2385 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
2386
2387 /*
2388 * We need to run this in all cases, since during the build_id
2389 * processing we had no idea this was the kernel dso.
2390 */
2391 if (dso != NULL) {
2392 dso__set_short_name(dso, short_name);
2393 dso->kernel = dso_type;
2394 }
2395
2396 return dso;
2397 }
2398
2399 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2400 {
2401 char path[PATH_MAX];
2402
2403 if (machine__is_default_guest(machine))
2404 return;
2405 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2406 if (sysfs__read_build_id(path, dso->build_id,
2407 sizeof(dso->build_id)) == 0)
2408 dso->has_build_id = true;
2409 }
2410
2411 static struct dso *machine__get_kernel(struct machine *machine)
2412 {
2413 const char *vmlinux_name = NULL;
2414 struct dso *kernel;
2415
2416 if (machine__is_host(machine)) {
2417 vmlinux_name = symbol_conf.vmlinux_name;
2418 if (!vmlinux_name)
2419 vmlinux_name = "[kernel.kallsyms]";
2420
2421 kernel = dso__kernel_findnew(machine, vmlinux_name,
2422 "[kernel]",
2423 DSO_TYPE_KERNEL);
2424 } else {
2425 char bf[PATH_MAX];
2426
2427 if (machine__is_default_guest(machine))
2428 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2429 if (!vmlinux_name)
2430 vmlinux_name = machine__mmap_name(machine, bf,
2431 sizeof(bf));
2432
2433 kernel = dso__kernel_findnew(machine, vmlinux_name,
2434 "[guest.kernel]",
2435 DSO_TYPE_GUEST_KERNEL);
2436 }
2437
2438 if (kernel != NULL && (!kernel->has_build_id))
2439 dso__read_running_kernel_build_id(kernel, machine);
2440
2441 return kernel;
2442 }
2443
2444 struct process_args {
2445 u64 start;
2446 };
2447
2448 static int symbol__in_kernel(void *arg, const char *name,
2449 char type __used, u64 start, u64 end __used)
2450 {
2451 struct process_args *args = arg;
2452
2453 if (strchr(name, '['))
2454 return 0;
2455
2456 args->start = start;
2457 return 1;
2458 }
2459
2460 /* Figure out the start address of kernel map from /proc/kallsyms */
2461 static u64 machine__get_kernel_start_addr(struct machine *machine)
2462 {
2463 const char *filename;
2464 char path[PATH_MAX];
2465 struct process_args args;
2466
2467 if (machine__is_host(machine)) {
2468 filename = "/proc/kallsyms";
2469 } else {
2470 if (machine__is_default_guest(machine))
2471 filename = (char *)symbol_conf.default_guest_kallsyms;
2472 else {
2473 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2474 filename = path;
2475 }
2476 }
2477
2478 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2479 return 0;
2480
2481 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2482 return 0;
2483
2484 return args.start;
2485 }
2486
2487 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2488 {
2489 enum map_type type;
2490 u64 start = machine__get_kernel_start_addr(machine);
2491
2492 for (type = 0; type < MAP__NR_TYPES; ++type) {
2493 struct kmap *kmap;
2494
2495 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2496 if (machine->vmlinux_maps[type] == NULL)
2497 return -1;
2498
2499 machine->vmlinux_maps[type]->map_ip =
2500 machine->vmlinux_maps[type]->unmap_ip =
2501 identity__map_ip;
2502 kmap = map__kmap(machine->vmlinux_maps[type]);
2503 kmap->kmaps = &machine->kmaps;
2504 map_groups__insert(&machine->kmaps,
2505 machine->vmlinux_maps[type]);
2506 }
2507
2508 return 0;
2509 }
2510
2511 void machine__destroy_kernel_maps(struct machine *machine)
2512 {
2513 enum map_type type;
2514
2515 for (type = 0; type < MAP__NR_TYPES; ++type) {
2516 struct kmap *kmap;
2517
2518 if (machine->vmlinux_maps[type] == NULL)
2519 continue;
2520
2521 kmap = map__kmap(machine->vmlinux_maps[type]);
2522 map_groups__remove(&machine->kmaps,
2523 machine->vmlinux_maps[type]);
2524 if (kmap->ref_reloc_sym) {
2525 /*
2526 * ref_reloc_sym is shared among all maps, so free just
2527 * on one of them.
2528 */
2529 if (type == MAP__FUNCTION) {
2530 free((char *)kmap->ref_reloc_sym->name);
2531 kmap->ref_reloc_sym->name = NULL;
2532 free(kmap->ref_reloc_sym);
2533 }
2534 kmap->ref_reloc_sym = NULL;
2535 }
2536
2537 map__delete(machine->vmlinux_maps[type]);
2538 machine->vmlinux_maps[type] = NULL;
2539 }
2540 }
2541
2542 int machine__create_kernel_maps(struct machine *machine)
2543 {
2544 struct dso *kernel = machine__get_kernel(machine);
2545
2546 if (kernel == NULL ||
2547 __machine__create_kernel_maps(machine, kernel) < 0)
2548 return -1;
2549
2550 if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2551 pr_debug("Problems creating module maps, continuing anyway...\n");
2552 /*
2553 * Now that we have all the maps created, just set the ->end of them:
2554 */
2555 map_groups__fixup_end(&machine->kmaps);
2556 return 0;
2557 }
2558
2559 static void vmlinux_path__exit(void)
2560 {
2561 while (--vmlinux_path__nr_entries >= 0) {
2562 free(vmlinux_path[vmlinux_path__nr_entries]);
2563 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2564 }
2565
2566 free(vmlinux_path);
2567 vmlinux_path = NULL;
2568 }
2569
2570 static int vmlinux_path__init(void)
2571 {
2572 struct utsname uts;
2573 char bf[PATH_MAX];
2574
2575 vmlinux_path = malloc(sizeof(char *) * 5);
2576 if (vmlinux_path == NULL)
2577 return -1;
2578
2579 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2580 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2581 goto out_fail;
2582 ++vmlinux_path__nr_entries;
2583 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2584 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2585 goto out_fail;
2586 ++vmlinux_path__nr_entries;
2587
2588 /* only try running kernel version if no symfs was given */
2589 if (symbol_conf.symfs[0] != 0)
2590 return 0;
2591
2592 if (uname(&uts) < 0)
2593 return -1;
2594
2595 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2596 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2597 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2598 goto out_fail;
2599 ++vmlinux_path__nr_entries;
2600 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2601 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2602 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2603 goto out_fail;
2604 ++vmlinux_path__nr_entries;
2605 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2606 uts.release);
2607 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2608 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2609 goto out_fail;
2610 ++vmlinux_path__nr_entries;
2611
2612 return 0;
2613
2614 out_fail:
2615 vmlinux_path__exit();
2616 return -1;
2617 }
2618
2619 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2620 {
2621 int i;
2622 size_t printed = 0;
2623 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2624
2625 if (kdso->has_build_id) {
2626 char filename[PATH_MAX];
2627 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2628 printed += fprintf(fp, "[0] %s\n", filename);
2629 }
2630
2631 for (i = 0; i < vmlinux_path__nr_entries; ++i)
2632 printed += fprintf(fp, "[%d] %s\n",
2633 i + kdso->has_build_id, vmlinux_path[i]);
2634
2635 return printed;
2636 }
2637
2638 static int setup_list(struct strlist **list, const char *list_str,
2639 const char *list_name)
2640 {
2641 if (list_str == NULL)
2642 return 0;
2643
2644 *list = strlist__new(true, list_str);
2645 if (!*list) {
2646 pr_err("problems parsing %s list\n", list_name);
2647 return -1;
2648 }
2649 return 0;
2650 }
2651
2652 static bool symbol__read_kptr_restrict(void)
2653 {
2654 bool value = false;
2655
2656 if (geteuid() != 0) {
2657 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2658 if (fp != NULL) {
2659 char line[8];
2660
2661 if (fgets(line, sizeof(line), fp) != NULL)
2662 value = atoi(line) != 0;
2663
2664 fclose(fp);
2665 }
2666 }
2667
2668 return value;
2669 }
2670
2671 int symbol__init(void)
2672 {
2673 const char *symfs;
2674
2675 if (symbol_conf.initialized)
2676 return 0;
2677
2678 symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2679
2680 elf_version(EV_CURRENT);
2681 if (symbol_conf.sort_by_name)
2682 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2683 sizeof(struct symbol));
2684
2685 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2686 return -1;
2687
2688 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2689 pr_err("'.' is the only non valid --field-separator argument\n");
2690 return -1;
2691 }
2692
2693 if (setup_list(&symbol_conf.dso_list,
2694 symbol_conf.dso_list_str, "dso") < 0)
2695 return -1;
2696
2697 if (setup_list(&symbol_conf.comm_list,
2698 symbol_conf.comm_list_str, "comm") < 0)
2699 goto out_free_dso_list;
2700
2701 if (setup_list(&symbol_conf.sym_list,
2702 symbol_conf.sym_list_str, "symbol") < 0)
2703 goto out_free_comm_list;
2704
2705 /*
2706 * A path to symbols of "/" is identical to ""
2707 * reset here for simplicity.
2708 */
2709 symfs = realpath(symbol_conf.symfs, NULL);
2710 if (symfs == NULL)
2711 symfs = symbol_conf.symfs;
2712 if (strcmp(symfs, "/") == 0)
2713 symbol_conf.symfs = "";
2714 if (symfs != symbol_conf.symfs)
2715 free((void *)symfs);
2716
2717 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2718
2719 symbol_conf.initialized = true;
2720 return 0;
2721
2722 out_free_comm_list:
2723 strlist__delete(symbol_conf.comm_list);
2724 out_free_dso_list:
2725 strlist__delete(symbol_conf.dso_list);
2726 return -1;
2727 }
2728
2729 void symbol__exit(void)
2730 {
2731 if (!symbol_conf.initialized)
2732 return;
2733 strlist__delete(symbol_conf.sym_list);
2734 strlist__delete(symbol_conf.dso_list);
2735 strlist__delete(symbol_conf.comm_list);
2736 vmlinux_path__exit();
2737 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2738 symbol_conf.initialized = false;
2739 }
2740
2741 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2742 {
2743 struct machine *machine = machines__findnew(machines, pid);
2744
2745 if (machine == NULL)
2746 return -1;
2747
2748 return machine__create_kernel_maps(machine);
2749 }
2750
2751 static int hex(char ch)
2752 {
2753 if ((ch >= '0') && (ch <= '9'))
2754 return ch - '0';
2755 if ((ch >= 'a') && (ch <= 'f'))
2756 return ch - 'a' + 10;
2757 if ((ch >= 'A') && (ch <= 'F'))
2758 return ch - 'A' + 10;
2759 return -1;
2760 }
2761
2762 /*
2763 * While we find nice hex chars, build a long_val.
2764 * Return number of chars processed.
2765 */
2766 int hex2u64(const char *ptr, u64 *long_val)
2767 {
2768 const char *p = ptr;
2769 *long_val = 0;
2770
2771 while (*p) {
2772 const int hex_val = hex(*p);
2773
2774 if (hex_val < 0)
2775 break;
2776
2777 *long_val = (*long_val << 4) | hex_val;
2778 p++;
2779 }
2780
2781 return p - ptr;
2782 }
2783
2784 char *strxfrchar(char *s, char from, char to)
2785 {
2786 char *p = s;
2787
2788 while ((p = strchr(p, from)) != NULL)
2789 *p++ = to;
2790
2791 return s;
2792 }
2793
2794 int machines__create_guest_kernel_maps(struct rb_root *machines)
2795 {
2796 int ret = 0;
2797 struct dirent **namelist = NULL;
2798 int i, items = 0;
2799 char path[PATH_MAX];
2800 pid_t pid;
2801
2802 if (symbol_conf.default_guest_vmlinux_name ||
2803 symbol_conf.default_guest_modules ||
2804 symbol_conf.default_guest_kallsyms) {
2805 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2806 }
2807
2808 if (symbol_conf.guestmount) {
2809 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2810 if (items <= 0)
2811 return -ENOENT;
2812 for (i = 0; i < items; i++) {
2813 if (!isdigit(namelist[i]->d_name[0])) {
2814 /* Filter out . and .. */
2815 continue;
2816 }
2817 pid = atoi(namelist[i]->d_name);
2818 sprintf(path, "%s/%s/proc/kallsyms",
2819 symbol_conf.guestmount,
2820 namelist[i]->d_name);
2821 ret = access(path, R_OK);
2822 if (ret) {
2823 pr_debug("Can't access file %s\n", path);
2824 goto failure;
2825 }
2826 machines__create_kernel_maps(machines, pid);
2827 }
2828 failure:
2829 free(namelist);
2830 }
2831
2832 return ret;
2833 }
2834
2835 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2836 {
2837 struct rb_node *next = rb_first(machines);
2838
2839 while (next) {
2840 struct machine *pos = rb_entry(next, struct machine, rb_node);
2841
2842 next = rb_next(&pos->rb_node);
2843 rb_erase(&pos->rb_node, machines);
2844 machine__delete(pos);
2845 }
2846 }
2847
2848 int machine__load_kallsyms(struct machine *machine, const char *filename,
2849 enum map_type type, symbol_filter_t filter)
2850 {
2851 struct map *map = machine->vmlinux_maps[type];
2852 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2853
2854 if (ret > 0) {
2855 dso__set_loaded(map->dso, type);
2856 /*
2857 * Since /proc/kallsyms will have multiple sessions for the
2858 * kernel, with modules between them, fixup the end of all
2859 * sections.
2860 */
2861 __map_groups__fixup_end(&machine->kmaps, type);
2862 }
2863
2864 return ret;
2865 }
2866
2867 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2868 symbol_filter_t filter)
2869 {
2870 struct map *map = machine->vmlinux_maps[type];
2871 int ret = dso__load_vmlinux_path(map->dso, map, filter);
2872
2873 if (ret > 0) {
2874 dso__set_loaded(map->dso, type);
2875 map__reloc_vmlinux(map);
2876 }
2877
2878 return ret;
2879 }
2880
2881 struct map *dso__new_map(const char *name)
2882 {
2883 struct map *map = NULL;
2884 struct dso *dso = dso__new(name);
2885
2886 if (dso)
2887 map = map__new2(0, dso, MAP__FUNCTION);
2888
2889 return map;
2890 }
kernel source for telekom puls (alcatel/mediatek)