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perf tools: Add pid/tid filtering to report and script commands
[deliverable/linux.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 "machine.h"
16 #include "symbol.h"
17 #include "strlist.h"
18 #include "intlist.h"
19 #include "header.h"
20
21 #include <elf.h>
22 #include <limits.h>
23 #include <symbol/kallsyms.h>
24 #include <sys/utsname.h>
25
26 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
27 symbol_filter_t filter);
28 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
29 symbol_filter_t filter);
30 int vmlinux_path__nr_entries;
31 char **vmlinux_path;
32
33 struct symbol_conf symbol_conf = {
34 .use_modules = true,
35 .try_vmlinux_path = true,
36 .annotate_src = true,
37 .demangle = true,
38 .demangle_kernel = false,
39 .cumulate_callchain = true,
40 .show_hist_headers = true,
41 .symfs = "",
42 };
43
44 static enum dso_binary_type binary_type_symtab[] = {
45 DSO_BINARY_TYPE__KALLSYMS,
46 DSO_BINARY_TYPE__GUEST_KALLSYMS,
47 DSO_BINARY_TYPE__JAVA_JIT,
48 DSO_BINARY_TYPE__DEBUGLINK,
49 DSO_BINARY_TYPE__BUILD_ID_CACHE,
50 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
51 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
52 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
53 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
54 DSO_BINARY_TYPE__GUEST_KMODULE,
55 DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
56 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
57 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
58 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
59 DSO_BINARY_TYPE__NOT_FOUND,
60 };
61
62 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
63
64 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
65 {
66 symbol_type = toupper(symbol_type);
67
68 switch (map_type) {
69 case MAP__FUNCTION:
70 return symbol_type == 'T' || symbol_type == 'W';
71 case MAP__VARIABLE:
72 return symbol_type == 'D';
73 default:
74 return false;
75 }
76 }
77
78 static int prefix_underscores_count(const char *str)
79 {
80 const char *tail = str;
81
82 while (*tail == '_')
83 tail++;
84
85 return tail - str;
86 }
87
88 #define SYMBOL_A 0
89 #define SYMBOL_B 1
90
91 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
92 {
93 s64 a;
94 s64 b;
95 size_t na, nb;
96
97 /* Prefer a symbol with non zero length */
98 a = syma->end - syma->start;
99 b = symb->end - symb->start;
100 if ((b == 0) && (a > 0))
101 return SYMBOL_A;
102 else if ((a == 0) && (b > 0))
103 return SYMBOL_B;
104
105 /* Prefer a non weak symbol over a weak one */
106 a = syma->binding == STB_WEAK;
107 b = symb->binding == STB_WEAK;
108 if (b && !a)
109 return SYMBOL_A;
110 if (a && !b)
111 return SYMBOL_B;
112
113 /* Prefer a global symbol over a non global one */
114 a = syma->binding == STB_GLOBAL;
115 b = symb->binding == STB_GLOBAL;
116 if (a && !b)
117 return SYMBOL_A;
118 if (b && !a)
119 return SYMBOL_B;
120
121 /* Prefer a symbol with less underscores */
122 a = prefix_underscores_count(syma->name);
123 b = prefix_underscores_count(symb->name);
124 if (b > a)
125 return SYMBOL_A;
126 else if (a > b)
127 return SYMBOL_B;
128
129 /* Choose the symbol with the longest name */
130 na = strlen(syma->name);
131 nb = strlen(symb->name);
132 if (na > nb)
133 return SYMBOL_A;
134 else if (na < nb)
135 return SYMBOL_B;
136
137 /* Avoid "SyS" kernel syscall aliases */
138 if (na >= 3 && !strncmp(syma->name, "SyS", 3))
139 return SYMBOL_B;
140 if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
141 return SYMBOL_B;
142
143 return SYMBOL_A;
144 }
145
146 void symbols__fixup_duplicate(struct rb_root *symbols)
147 {
148 struct rb_node *nd;
149 struct symbol *curr, *next;
150
151 nd = rb_first(symbols);
152
153 while (nd) {
154 curr = rb_entry(nd, struct symbol, rb_node);
155 again:
156 nd = rb_next(&curr->rb_node);
157 next = rb_entry(nd, struct symbol, rb_node);
158
159 if (!nd)
160 break;
161
162 if (curr->start != next->start)
163 continue;
164
165 if (choose_best_symbol(curr, next) == SYMBOL_A) {
166 rb_erase(&next->rb_node, symbols);
167 symbol__delete(next);
168 goto again;
169 } else {
170 nd = rb_next(&curr->rb_node);
171 rb_erase(&curr->rb_node, symbols);
172 symbol__delete(curr);
173 }
174 }
175 }
176
177 void symbols__fixup_end(struct rb_root *symbols)
178 {
179 struct rb_node *nd, *prevnd = rb_first(symbols);
180 struct symbol *curr, *prev;
181
182 if (prevnd == NULL)
183 return;
184
185 curr = rb_entry(prevnd, struct symbol, rb_node);
186
187 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
188 prev = curr;
189 curr = rb_entry(nd, struct symbol, rb_node);
190
191 if (prev->end == prev->start && prev->end != curr->start)
192 prev->end = curr->start;
193 }
194
195 /* Last entry */
196 if (curr->end == curr->start)
197 curr->end = roundup(curr->start, 4096);
198 }
199
200 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
201 {
202 struct map *prev, *curr;
203 struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
204
205 if (prevnd == NULL)
206 return;
207
208 curr = rb_entry(prevnd, struct map, rb_node);
209
210 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
211 prev = curr;
212 curr = rb_entry(nd, struct map, rb_node);
213 prev->end = curr->start;
214 }
215
216 /*
217 * We still haven't the actual symbols, so guess the
218 * last map final address.
219 */
220 curr->end = ~0ULL;
221 }
222
223 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
224 {
225 size_t namelen = strlen(name) + 1;
226 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
227 sizeof(*sym) + namelen));
228 if (sym == NULL)
229 return NULL;
230
231 if (symbol_conf.priv_size)
232 sym = ((void *)sym) + symbol_conf.priv_size;
233
234 sym->start = start;
235 sym->end = len ? start + len : start;
236 sym->binding = binding;
237 sym->namelen = namelen - 1;
238
239 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
240 __func__, name, start, sym->end);
241 memcpy(sym->name, name, namelen);
242
243 return sym;
244 }
245
246 void symbol__delete(struct symbol *sym)
247 {
248 free(((void *)sym) - symbol_conf.priv_size);
249 }
250
251 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
252 {
253 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
254 sym->start, sym->end,
255 sym->binding == STB_GLOBAL ? 'g' :
256 sym->binding == STB_LOCAL ? 'l' : 'w',
257 sym->name);
258 }
259
260 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
261 const struct addr_location *al, FILE *fp)
262 {
263 unsigned long offset;
264 size_t length;
265
266 if (sym && sym->name) {
267 length = fprintf(fp, "%s", sym->name);
268 if (al) {
269 if (al->addr < sym->end)
270 offset = al->addr - sym->start;
271 else
272 offset = al->addr - al->map->start - sym->start;
273 length += fprintf(fp, "+0x%lx", offset);
274 }
275 return length;
276 } else
277 return fprintf(fp, "[unknown]");
278 }
279
280 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
281 {
282 return symbol__fprintf_symname_offs(sym, NULL, fp);
283 }
284
285 void symbols__delete(struct rb_root *symbols)
286 {
287 struct symbol *pos;
288 struct rb_node *next = rb_first(symbols);
289
290 while (next) {
291 pos = rb_entry(next, struct symbol, rb_node);
292 next = rb_next(&pos->rb_node);
293 rb_erase(&pos->rb_node, symbols);
294 symbol__delete(pos);
295 }
296 }
297
298 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
299 {
300 struct rb_node **p = &symbols->rb_node;
301 struct rb_node *parent = NULL;
302 const u64 ip = sym->start;
303 struct symbol *s;
304
305 while (*p != NULL) {
306 parent = *p;
307 s = rb_entry(parent, struct symbol, rb_node);
308 if (ip < s->start)
309 p = &(*p)->rb_left;
310 else
311 p = &(*p)->rb_right;
312 }
313 rb_link_node(&sym->rb_node, parent, p);
314 rb_insert_color(&sym->rb_node, symbols);
315 }
316
317 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
318 {
319 struct rb_node *n;
320
321 if (symbols == NULL)
322 return NULL;
323
324 n = symbols->rb_node;
325
326 while (n) {
327 struct symbol *s = rb_entry(n, struct symbol, rb_node);
328
329 if (ip < s->start)
330 n = n->rb_left;
331 else if (ip >= s->end)
332 n = n->rb_right;
333 else
334 return s;
335 }
336
337 return NULL;
338 }
339
340 static struct symbol *symbols__first(struct rb_root *symbols)
341 {
342 struct rb_node *n = rb_first(symbols);
343
344 if (n)
345 return rb_entry(n, struct symbol, rb_node);
346
347 return NULL;
348 }
349
350 static struct symbol *symbols__next(struct symbol *sym)
351 {
352 struct rb_node *n = rb_next(&sym->rb_node);
353
354 if (n)
355 return rb_entry(n, struct symbol, rb_node);
356
357 return NULL;
358 }
359
360 struct symbol_name_rb_node {
361 struct rb_node rb_node;
362 struct symbol sym;
363 };
364
365 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
366 {
367 struct rb_node **p = &symbols->rb_node;
368 struct rb_node *parent = NULL;
369 struct symbol_name_rb_node *symn, *s;
370
371 symn = container_of(sym, struct symbol_name_rb_node, sym);
372
373 while (*p != NULL) {
374 parent = *p;
375 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
376 if (strcmp(sym->name, s->sym.name) < 0)
377 p = &(*p)->rb_left;
378 else
379 p = &(*p)->rb_right;
380 }
381 rb_link_node(&symn->rb_node, parent, p);
382 rb_insert_color(&symn->rb_node, symbols);
383 }
384
385 static void symbols__sort_by_name(struct rb_root *symbols,
386 struct rb_root *source)
387 {
388 struct rb_node *nd;
389
390 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
391 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
392 symbols__insert_by_name(symbols, pos);
393 }
394 }
395
396 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
397 const char *name)
398 {
399 struct rb_node *n;
400 struct symbol_name_rb_node *s;
401
402 if (symbols == NULL)
403 return NULL;
404
405 n = symbols->rb_node;
406
407 while (n) {
408 int cmp;
409
410 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
411 cmp = strcmp(name, s->sym.name);
412
413 if (cmp < 0)
414 n = n->rb_left;
415 else if (cmp > 0)
416 n = n->rb_right;
417 else
418 break;
419 }
420
421 if (n == NULL)
422 return NULL;
423
424 /* return first symbol that has same name (if any) */
425 for (n = rb_prev(n); n; n = rb_prev(n)) {
426 struct symbol_name_rb_node *tmp;
427
428 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
429 if (strcmp(tmp->sym.name, s->sym.name))
430 break;
431
432 s = tmp;
433 }
434
435 return &s->sym;
436 }
437
438 struct symbol *dso__find_symbol(struct dso *dso,
439 enum map_type type, u64 addr)
440 {
441 return symbols__find(&dso->symbols[type], addr);
442 }
443
444 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
445 {
446 return symbols__first(&dso->symbols[type]);
447 }
448
449 struct symbol *dso__next_symbol(struct symbol *sym)
450 {
451 return symbols__next(sym);
452 }
453
454 struct symbol *symbol__next_by_name(struct symbol *sym)
455 {
456 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
457 struct rb_node *n = rb_next(&s->rb_node);
458
459 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
460 }
461
462 /*
463 * Teturns first symbol that matched with @name.
464 */
465 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
466 const char *name)
467 {
468 return symbols__find_by_name(&dso->symbol_names[type], name);
469 }
470
471 void dso__sort_by_name(struct dso *dso, enum map_type type)
472 {
473 dso__set_sorted_by_name(dso, type);
474 return symbols__sort_by_name(&dso->symbol_names[type],
475 &dso->symbols[type]);
476 }
477
478 size_t dso__fprintf_symbols_by_name(struct dso *dso,
479 enum map_type type, FILE *fp)
480 {
481 size_t ret = 0;
482 struct rb_node *nd;
483 struct symbol_name_rb_node *pos;
484
485 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
486 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
487 fprintf(fp, "%s\n", pos->sym.name);
488 }
489
490 return ret;
491 }
492
493 int modules__parse(const char *filename, void *arg,
494 int (*process_module)(void *arg, const char *name,
495 u64 start))
496 {
497 char *line = NULL;
498 size_t n;
499 FILE *file;
500 int err = 0;
501
502 file = fopen(filename, "r");
503 if (file == NULL)
504 return -1;
505
506 while (1) {
507 char name[PATH_MAX];
508 u64 start;
509 char *sep;
510 ssize_t line_len;
511
512 line_len = getline(&line, &n, file);
513 if (line_len < 0) {
514 if (feof(file))
515 break;
516 err = -1;
517 goto out;
518 }
519
520 if (!line) {
521 err = -1;
522 goto out;
523 }
524
525 line[--line_len] = '\0'; /* \n */
526
527 sep = strrchr(line, 'x');
528 if (sep == NULL)
529 continue;
530
531 hex2u64(sep + 1, &start);
532
533 sep = strchr(line, ' ');
534 if (sep == NULL)
535 continue;
536
537 *sep = '\0';
538
539 scnprintf(name, sizeof(name), "[%s]", line);
540
541 err = process_module(arg, name, start);
542 if (err)
543 break;
544 }
545 out:
546 free(line);
547 fclose(file);
548 return err;
549 }
550
551 struct process_kallsyms_args {
552 struct map *map;
553 struct dso *dso;
554 };
555
556 /*
557 * These are symbols in the kernel image, so make sure that
558 * sym is from a kernel DSO.
559 */
560 bool symbol__is_idle(struct symbol *sym)
561 {
562 const char * const idle_symbols[] = {
563 "cpu_idle",
564 "cpu_startup_entry",
565 "intel_idle",
566 "default_idle",
567 "native_safe_halt",
568 "enter_idle",
569 "exit_idle",
570 "mwait_idle",
571 "mwait_idle_with_hints",
572 "poll_idle",
573 "ppc64_runlatch_off",
574 "pseries_dedicated_idle_sleep",
575 NULL
576 };
577
578 int i;
579
580 if (!sym)
581 return false;
582
583 for (i = 0; idle_symbols[i]; i++) {
584 if (!strcmp(idle_symbols[i], sym->name))
585 return true;
586 }
587
588 return false;
589 }
590
591 static int map__process_kallsym_symbol(void *arg, const char *name,
592 char type, u64 start)
593 {
594 struct symbol *sym;
595 struct process_kallsyms_args *a = arg;
596 struct rb_root *root = &a->dso->symbols[a->map->type];
597
598 if (!symbol_type__is_a(type, a->map->type))
599 return 0;
600
601 /*
602 * module symbols are not sorted so we add all
603 * symbols, setting length to 0, and rely on
604 * symbols__fixup_end() to fix it up.
605 */
606 sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
607 if (sym == NULL)
608 return -ENOMEM;
609 /*
610 * We will pass the symbols to the filter later, in
611 * map__split_kallsyms, when we have split the maps per module
612 */
613 symbols__insert(root, sym);
614
615 return 0;
616 }
617
618 /*
619 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
620 * so that we can in the next step set the symbol ->end address and then
621 * call kernel_maps__split_kallsyms.
622 */
623 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
624 struct map *map)
625 {
626 struct process_kallsyms_args args = { .map = map, .dso = dso, };
627 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
628 }
629
630 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
631 symbol_filter_t filter)
632 {
633 struct map_groups *kmaps = map__kmap(map)->kmaps;
634 struct map *curr_map;
635 struct symbol *pos;
636 int count = 0, moved = 0;
637 struct rb_root *root = &dso->symbols[map->type];
638 struct rb_node *next = rb_first(root);
639
640 while (next) {
641 char *module;
642
643 pos = rb_entry(next, struct symbol, rb_node);
644 next = rb_next(&pos->rb_node);
645
646 module = strchr(pos->name, '\t');
647 if (module)
648 *module = '\0';
649
650 curr_map = map_groups__find(kmaps, map->type, pos->start);
651
652 if (!curr_map || (filter && filter(curr_map, pos))) {
653 rb_erase(&pos->rb_node, root);
654 symbol__delete(pos);
655 } else {
656 pos->start -= curr_map->start - curr_map->pgoff;
657 if (pos->end)
658 pos->end -= curr_map->start - curr_map->pgoff;
659 if (curr_map != map) {
660 rb_erase(&pos->rb_node, root);
661 symbols__insert(
662 &curr_map->dso->symbols[curr_map->type],
663 pos);
664 ++moved;
665 } else {
666 ++count;
667 }
668 }
669 }
670
671 /* Symbols have been adjusted */
672 dso->adjust_symbols = 1;
673
674 return count + moved;
675 }
676
677 /*
678 * Split the symbols into maps, making sure there are no overlaps, i.e. the
679 * kernel range is broken in several maps, named [kernel].N, as we don't have
680 * the original ELF section names vmlinux have.
681 */
682 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
683 symbol_filter_t filter)
684 {
685 struct map_groups *kmaps = map__kmap(map)->kmaps;
686 struct machine *machine = kmaps->machine;
687 struct map *curr_map = map;
688 struct symbol *pos;
689 int count = 0, moved = 0;
690 struct rb_root *root = &dso->symbols[map->type];
691 struct rb_node *next = rb_first(root);
692 int kernel_range = 0;
693
694 while (next) {
695 char *module;
696
697 pos = rb_entry(next, struct symbol, rb_node);
698 next = rb_next(&pos->rb_node);
699
700 module = strchr(pos->name, '\t');
701 if (module) {
702 if (!symbol_conf.use_modules)
703 goto discard_symbol;
704
705 *module++ = '\0';
706
707 if (strcmp(curr_map->dso->short_name, module)) {
708 if (curr_map != map &&
709 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
710 machine__is_default_guest(machine)) {
711 /*
712 * We assume all symbols of a module are
713 * continuous in * kallsyms, so curr_map
714 * points to a module and all its
715 * symbols are in its kmap. Mark it as
716 * loaded.
717 */
718 dso__set_loaded(curr_map->dso,
719 curr_map->type);
720 }
721
722 curr_map = map_groups__find_by_name(kmaps,
723 map->type, module);
724 if (curr_map == NULL) {
725 pr_debug("%s/proc/{kallsyms,modules} "
726 "inconsistency while looking "
727 "for \"%s\" module!\n",
728 machine->root_dir, module);
729 curr_map = map;
730 goto discard_symbol;
731 }
732
733 if (curr_map->dso->loaded &&
734 !machine__is_default_guest(machine))
735 goto discard_symbol;
736 }
737 /*
738 * So that we look just like we get from .ko files,
739 * i.e. not prelinked, relative to map->start.
740 */
741 pos->start = curr_map->map_ip(curr_map, pos->start);
742 pos->end = curr_map->map_ip(curr_map, pos->end);
743 } else if (curr_map != map) {
744 char dso_name[PATH_MAX];
745 struct dso *ndso;
746
747 if (delta) {
748 /* Kernel was relocated at boot time */
749 pos->start -= delta;
750 pos->end -= delta;
751 }
752
753 if (count == 0) {
754 curr_map = map;
755 goto filter_symbol;
756 }
757
758 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
759 snprintf(dso_name, sizeof(dso_name),
760 "[guest.kernel].%d",
761 kernel_range++);
762 else
763 snprintf(dso_name, sizeof(dso_name),
764 "[kernel].%d",
765 kernel_range++);
766
767 ndso = dso__new(dso_name);
768 if (ndso == NULL)
769 return -1;
770
771 ndso->kernel = dso->kernel;
772
773 curr_map = map__new2(pos->start, ndso, map->type);
774 if (curr_map == NULL) {
775 dso__delete(ndso);
776 return -1;
777 }
778
779 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
780 map_groups__insert(kmaps, curr_map);
781 ++kernel_range;
782 } else if (delta) {
783 /* Kernel was relocated at boot time */
784 pos->start -= delta;
785 pos->end -= delta;
786 }
787 filter_symbol:
788 if (filter && filter(curr_map, pos)) {
789 discard_symbol: rb_erase(&pos->rb_node, root);
790 symbol__delete(pos);
791 } else {
792 if (curr_map != map) {
793 rb_erase(&pos->rb_node, root);
794 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
795 ++moved;
796 } else
797 ++count;
798 }
799 }
800
801 if (curr_map != map &&
802 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
803 machine__is_default_guest(kmaps->machine)) {
804 dso__set_loaded(curr_map->dso, curr_map->type);
805 }
806
807 return count + moved;
808 }
809
810 bool symbol__restricted_filename(const char *filename,
811 const char *restricted_filename)
812 {
813 bool restricted = false;
814
815 if (symbol_conf.kptr_restrict) {
816 char *r = realpath(filename, NULL);
817
818 if (r != NULL) {
819 restricted = strcmp(r, restricted_filename) == 0;
820 free(r);
821 return restricted;
822 }
823 }
824
825 return restricted;
826 }
827
828 struct module_info {
829 struct rb_node rb_node;
830 char *name;
831 u64 start;
832 };
833
834 static void add_module(struct module_info *mi, struct rb_root *modules)
835 {
836 struct rb_node **p = &modules->rb_node;
837 struct rb_node *parent = NULL;
838 struct module_info *m;
839
840 while (*p != NULL) {
841 parent = *p;
842 m = rb_entry(parent, struct module_info, rb_node);
843 if (strcmp(mi->name, m->name) < 0)
844 p = &(*p)->rb_left;
845 else
846 p = &(*p)->rb_right;
847 }
848 rb_link_node(&mi->rb_node, parent, p);
849 rb_insert_color(&mi->rb_node, modules);
850 }
851
852 static void delete_modules(struct rb_root *modules)
853 {
854 struct module_info *mi;
855 struct rb_node *next = rb_first(modules);
856
857 while (next) {
858 mi = rb_entry(next, struct module_info, rb_node);
859 next = rb_next(&mi->rb_node);
860 rb_erase(&mi->rb_node, modules);
861 zfree(&mi->name);
862 free(mi);
863 }
864 }
865
866 static struct module_info *find_module(const char *name,
867 struct rb_root *modules)
868 {
869 struct rb_node *n = modules->rb_node;
870
871 while (n) {
872 struct module_info *m;
873 int cmp;
874
875 m = rb_entry(n, struct module_info, rb_node);
876 cmp = strcmp(name, m->name);
877 if (cmp < 0)
878 n = n->rb_left;
879 else if (cmp > 0)
880 n = n->rb_right;
881 else
882 return m;
883 }
884
885 return NULL;
886 }
887
888 static int __read_proc_modules(void *arg, const char *name, u64 start)
889 {
890 struct rb_root *modules = arg;
891 struct module_info *mi;
892
893 mi = zalloc(sizeof(struct module_info));
894 if (!mi)
895 return -ENOMEM;
896
897 mi->name = strdup(name);
898 mi->start = start;
899
900 if (!mi->name) {
901 free(mi);
902 return -ENOMEM;
903 }
904
905 add_module(mi, modules);
906
907 return 0;
908 }
909
910 static int read_proc_modules(const char *filename, struct rb_root *modules)
911 {
912 if (symbol__restricted_filename(filename, "/proc/modules"))
913 return -1;
914
915 if (modules__parse(filename, modules, __read_proc_modules)) {
916 delete_modules(modules);
917 return -1;
918 }
919
920 return 0;
921 }
922
923 int compare_proc_modules(const char *from, const char *to)
924 {
925 struct rb_root from_modules = RB_ROOT;
926 struct rb_root to_modules = RB_ROOT;
927 struct rb_node *from_node, *to_node;
928 struct module_info *from_m, *to_m;
929 int ret = -1;
930
931 if (read_proc_modules(from, &from_modules))
932 return -1;
933
934 if (read_proc_modules(to, &to_modules))
935 goto out_delete_from;
936
937 from_node = rb_first(&from_modules);
938 to_node = rb_first(&to_modules);
939 while (from_node) {
940 if (!to_node)
941 break;
942
943 from_m = rb_entry(from_node, struct module_info, rb_node);
944 to_m = rb_entry(to_node, struct module_info, rb_node);
945
946 if (from_m->start != to_m->start ||
947 strcmp(from_m->name, to_m->name))
948 break;
949
950 from_node = rb_next(from_node);
951 to_node = rb_next(to_node);
952 }
953
954 if (!from_node && !to_node)
955 ret = 0;
956
957 delete_modules(&to_modules);
958 out_delete_from:
959 delete_modules(&from_modules);
960
961 return ret;
962 }
963
964 static int do_validate_kcore_modules(const char *filename, struct map *map,
965 struct map_groups *kmaps)
966 {
967 struct rb_root modules = RB_ROOT;
968 struct map *old_map;
969 int err;
970
971 err = read_proc_modules(filename, &modules);
972 if (err)
973 return err;
974
975 old_map = map_groups__first(kmaps, map->type);
976 while (old_map) {
977 struct map *next = map_groups__next(old_map);
978 struct module_info *mi;
979
980 if (old_map == map || old_map->start == map->start) {
981 /* The kernel map */
982 old_map = next;
983 continue;
984 }
985
986 /* Module must be in memory at the same address */
987 mi = find_module(old_map->dso->short_name, &modules);
988 if (!mi || mi->start != old_map->start) {
989 err = -EINVAL;
990 goto out;
991 }
992
993 old_map = next;
994 }
995 out:
996 delete_modules(&modules);
997 return err;
998 }
999
1000 /*
1001 * If kallsyms is referenced by name then we look for filename in the same
1002 * directory.
1003 */
1004 static bool filename_from_kallsyms_filename(char *filename,
1005 const char *base_name,
1006 const char *kallsyms_filename)
1007 {
1008 char *name;
1009
1010 strcpy(filename, kallsyms_filename);
1011 name = strrchr(filename, '/');
1012 if (!name)
1013 return false;
1014
1015 name += 1;
1016
1017 if (!strcmp(name, "kallsyms")) {
1018 strcpy(name, base_name);
1019 return true;
1020 }
1021
1022 return false;
1023 }
1024
1025 static int validate_kcore_modules(const char *kallsyms_filename,
1026 struct map *map)
1027 {
1028 struct map_groups *kmaps = map__kmap(map)->kmaps;
1029 char modules_filename[PATH_MAX];
1030
1031 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1032 kallsyms_filename))
1033 return -EINVAL;
1034
1035 if (do_validate_kcore_modules(modules_filename, map, kmaps))
1036 return -EINVAL;
1037
1038 return 0;
1039 }
1040
1041 static int validate_kcore_addresses(const char *kallsyms_filename,
1042 struct map *map)
1043 {
1044 struct kmap *kmap = map__kmap(map);
1045
1046 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1047 u64 start;
1048
1049 start = kallsyms__get_function_start(kallsyms_filename,
1050 kmap->ref_reloc_sym->name);
1051 if (start != kmap->ref_reloc_sym->addr)
1052 return -EINVAL;
1053 }
1054
1055 return validate_kcore_modules(kallsyms_filename, map);
1056 }
1057
1058 struct kcore_mapfn_data {
1059 struct dso *dso;
1060 enum map_type type;
1061 struct list_head maps;
1062 };
1063
1064 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1065 {
1066 struct kcore_mapfn_data *md = data;
1067 struct map *map;
1068
1069 map = map__new2(start, md->dso, md->type);
1070 if (map == NULL)
1071 return -ENOMEM;
1072
1073 map->end = map->start + len;
1074 map->pgoff = pgoff;
1075
1076 list_add(&map->node, &md->maps);
1077
1078 return 0;
1079 }
1080
1081 static int dso__load_kcore(struct dso *dso, struct map *map,
1082 const char *kallsyms_filename)
1083 {
1084 struct map_groups *kmaps = map__kmap(map)->kmaps;
1085 struct machine *machine = kmaps->machine;
1086 struct kcore_mapfn_data md;
1087 struct map *old_map, *new_map, *replacement_map = NULL;
1088 bool is_64_bit;
1089 int err, fd;
1090 char kcore_filename[PATH_MAX];
1091 struct symbol *sym;
1092
1093 /* This function requires that the map is the kernel map */
1094 if (map != machine->vmlinux_maps[map->type])
1095 return -EINVAL;
1096
1097 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1098 kallsyms_filename))
1099 return -EINVAL;
1100
1101 /* Modules and kernel must be present at their original addresses */
1102 if (validate_kcore_addresses(kallsyms_filename, map))
1103 return -EINVAL;
1104
1105 md.dso = dso;
1106 md.type = map->type;
1107 INIT_LIST_HEAD(&md.maps);
1108
1109 fd = open(kcore_filename, O_RDONLY);
1110 if (fd < 0)
1111 return -EINVAL;
1112
1113 /* Read new maps into temporary lists */
1114 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1115 &is_64_bit);
1116 if (err)
1117 goto out_err;
1118 dso->is_64_bit = is_64_bit;
1119
1120 if (list_empty(&md.maps)) {
1121 err = -EINVAL;
1122 goto out_err;
1123 }
1124
1125 /* Remove old maps */
1126 old_map = map_groups__first(kmaps, map->type);
1127 while (old_map) {
1128 struct map *next = map_groups__next(old_map);
1129
1130 if (old_map != map)
1131 map_groups__remove(kmaps, old_map);
1132 old_map = next;
1133 }
1134
1135 /* Find the kernel map using the first symbol */
1136 sym = dso__first_symbol(dso, map->type);
1137 list_for_each_entry(new_map, &md.maps, node) {
1138 if (sym && sym->start >= new_map->start &&
1139 sym->start < new_map->end) {
1140 replacement_map = new_map;
1141 break;
1142 }
1143 }
1144
1145 if (!replacement_map)
1146 replacement_map = list_entry(md.maps.next, struct map, node);
1147
1148 /* Add new maps */
1149 while (!list_empty(&md.maps)) {
1150 new_map = list_entry(md.maps.next, struct map, node);
1151 list_del(&new_map->node);
1152 if (new_map == replacement_map) {
1153 map->start = new_map->start;
1154 map->end = new_map->end;
1155 map->pgoff = new_map->pgoff;
1156 map->map_ip = new_map->map_ip;
1157 map->unmap_ip = new_map->unmap_ip;
1158 map__delete(new_map);
1159 /* Ensure maps are correctly ordered */
1160 map_groups__remove(kmaps, map);
1161 map_groups__insert(kmaps, map);
1162 } else {
1163 map_groups__insert(kmaps, new_map);
1164 }
1165 }
1166
1167 /*
1168 * Set the data type and long name so that kcore can be read via
1169 * dso__data_read_addr().
1170 */
1171 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1172 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1173 else
1174 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1175 dso__set_long_name(dso, strdup(kcore_filename), true);
1176
1177 close(fd);
1178
1179 if (map->type == MAP__FUNCTION)
1180 pr_debug("Using %s for kernel object code\n", kcore_filename);
1181 else
1182 pr_debug("Using %s for kernel data\n", kcore_filename);
1183
1184 return 0;
1185
1186 out_err:
1187 while (!list_empty(&md.maps)) {
1188 map = list_entry(md.maps.next, struct map, node);
1189 list_del(&map->node);
1190 map__delete(map);
1191 }
1192 close(fd);
1193 return -EINVAL;
1194 }
1195
1196 /*
1197 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1198 * delta based on the relocation reference symbol.
1199 */
1200 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1201 {
1202 struct kmap *kmap = map__kmap(map);
1203 u64 addr;
1204
1205 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1206 return 0;
1207
1208 addr = kallsyms__get_function_start(filename,
1209 kmap->ref_reloc_sym->name);
1210 if (!addr)
1211 return -1;
1212
1213 *delta = addr - kmap->ref_reloc_sym->addr;
1214 return 0;
1215 }
1216
1217 int dso__load_kallsyms(struct dso *dso, const char *filename,
1218 struct map *map, symbol_filter_t filter)
1219 {
1220 u64 delta = 0;
1221
1222 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1223 return -1;
1224
1225 if (dso__load_all_kallsyms(dso, filename, map) < 0)
1226 return -1;
1227
1228 if (kallsyms__delta(map, filename, &delta))
1229 return -1;
1230
1231 symbols__fixup_duplicate(&dso->symbols[map->type]);
1232 symbols__fixup_end(&dso->symbols[map->type]);
1233
1234 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1235 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1236 else
1237 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1238
1239 if (!dso__load_kcore(dso, map, filename))
1240 return dso__split_kallsyms_for_kcore(dso, map, filter);
1241 else
1242 return dso__split_kallsyms(dso, map, delta, filter);
1243 }
1244
1245 static int dso__load_perf_map(struct dso *dso, struct map *map,
1246 symbol_filter_t filter)
1247 {
1248 char *line = NULL;
1249 size_t n;
1250 FILE *file;
1251 int nr_syms = 0;
1252
1253 file = fopen(dso->long_name, "r");
1254 if (file == NULL)
1255 goto out_failure;
1256
1257 while (!feof(file)) {
1258 u64 start, size;
1259 struct symbol *sym;
1260 int line_len, len;
1261
1262 line_len = getline(&line, &n, file);
1263 if (line_len < 0)
1264 break;
1265
1266 if (!line)
1267 goto out_failure;
1268
1269 line[--line_len] = '\0'; /* \n */
1270
1271 len = hex2u64(line, &start);
1272
1273 len++;
1274 if (len + 2 >= line_len)
1275 continue;
1276
1277 len += hex2u64(line + len, &size);
1278
1279 len++;
1280 if (len + 2 >= line_len)
1281 continue;
1282
1283 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1284
1285 if (sym == NULL)
1286 goto out_delete_line;
1287
1288 if (filter && filter(map, sym))
1289 symbol__delete(sym);
1290 else {
1291 symbols__insert(&dso->symbols[map->type], sym);
1292 nr_syms++;
1293 }
1294 }
1295
1296 free(line);
1297 fclose(file);
1298
1299 return nr_syms;
1300
1301 out_delete_line:
1302 free(line);
1303 out_failure:
1304 return -1;
1305 }
1306
1307 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1308 enum dso_binary_type type)
1309 {
1310 switch (type) {
1311 case DSO_BINARY_TYPE__JAVA_JIT:
1312 case DSO_BINARY_TYPE__DEBUGLINK:
1313 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1314 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1315 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1316 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1317 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1318 return !kmod && dso->kernel == DSO_TYPE_USER;
1319
1320 case DSO_BINARY_TYPE__KALLSYMS:
1321 case DSO_BINARY_TYPE__VMLINUX:
1322 case DSO_BINARY_TYPE__KCORE:
1323 return dso->kernel == DSO_TYPE_KERNEL;
1324
1325 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1326 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1327 case DSO_BINARY_TYPE__GUEST_KCORE:
1328 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1329
1330 case DSO_BINARY_TYPE__GUEST_KMODULE:
1331 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1332 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1333 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1334 /*
1335 * kernel modules know their symtab type - it's set when
1336 * creating a module dso in machine__new_module().
1337 */
1338 return kmod && dso->symtab_type == type;
1339
1340 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1341 return true;
1342
1343 case DSO_BINARY_TYPE__NOT_FOUND:
1344 default:
1345 return false;
1346 }
1347 }
1348
1349 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1350 {
1351 char *name;
1352 int ret = -1;
1353 u_int i;
1354 struct machine *machine;
1355 char *root_dir = (char *) "";
1356 int ss_pos = 0;
1357 struct symsrc ss_[2];
1358 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1359 bool kmod;
1360
1361 dso__set_loaded(dso, map->type);
1362
1363 if (dso->kernel == DSO_TYPE_KERNEL)
1364 return dso__load_kernel_sym(dso, map, filter);
1365 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1366 return dso__load_guest_kernel_sym(dso, map, filter);
1367
1368 if (map->groups && map->groups->machine)
1369 machine = map->groups->machine;
1370 else
1371 machine = NULL;
1372
1373 dso->adjust_symbols = 0;
1374
1375 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1376 struct stat st;
1377
1378 if (lstat(dso->name, &st) < 0)
1379 return -1;
1380
1381 if (st.st_uid && (st.st_uid != geteuid())) {
1382 pr_warning("File %s not owned by current user or root, "
1383 "ignoring it.\n", dso->name);
1384 return -1;
1385 }
1386
1387 ret = dso__load_perf_map(dso, map, filter);
1388 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1389 DSO_BINARY_TYPE__NOT_FOUND;
1390 return ret;
1391 }
1392
1393 if (machine)
1394 root_dir = machine->root_dir;
1395
1396 name = malloc(PATH_MAX);
1397 if (!name)
1398 return -1;
1399
1400 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1401 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1402 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1403 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1404
1405 /*
1406 * Iterate over candidate debug images.
1407 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1408 * and/or opd section) for processing.
1409 */
1410 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1411 struct symsrc *ss = &ss_[ss_pos];
1412 bool next_slot = false;
1413
1414 enum dso_binary_type symtab_type = binary_type_symtab[i];
1415
1416 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1417 continue;
1418
1419 if (dso__read_binary_type_filename(dso, symtab_type,
1420 root_dir, name, PATH_MAX))
1421 continue;
1422
1423 /* Name is now the name of the next image to try */
1424 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1425 continue;
1426
1427 if (!syms_ss && symsrc__has_symtab(ss)) {
1428 syms_ss = ss;
1429 next_slot = true;
1430 if (!dso->symsrc_filename)
1431 dso->symsrc_filename = strdup(name);
1432 }
1433
1434 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1435 runtime_ss = ss;
1436 next_slot = true;
1437 }
1438
1439 if (next_slot) {
1440 ss_pos++;
1441
1442 if (syms_ss && runtime_ss)
1443 break;
1444 } else {
1445 symsrc__destroy(ss);
1446 }
1447
1448 }
1449
1450 if (!runtime_ss && !syms_ss)
1451 goto out_free;
1452
1453 if (runtime_ss && !syms_ss) {
1454 syms_ss = runtime_ss;
1455 }
1456
1457 /* We'll have to hope for the best */
1458 if (!runtime_ss && syms_ss)
1459 runtime_ss = syms_ss;
1460
1461 if (syms_ss)
1462 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1463 else
1464 ret = -1;
1465
1466 if (ret > 0) {
1467 int nr_plt;
1468
1469 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1470 if (nr_plt > 0)
1471 ret += nr_plt;
1472 }
1473
1474 for (; ss_pos > 0; ss_pos--)
1475 symsrc__destroy(&ss_[ss_pos - 1]);
1476 out_free:
1477 free(name);
1478 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1479 return 0;
1480 return ret;
1481 }
1482
1483 struct map *map_groups__find_by_name(struct map_groups *mg,
1484 enum map_type type, const char *name)
1485 {
1486 struct rb_node *nd;
1487
1488 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1489 struct map *map = rb_entry(nd, struct map, rb_node);
1490
1491 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1492 return map;
1493 }
1494
1495 return NULL;
1496 }
1497
1498 int dso__load_vmlinux(struct dso *dso, struct map *map,
1499 const char *vmlinux, bool vmlinux_allocated,
1500 symbol_filter_t filter)
1501 {
1502 int err = -1;
1503 struct symsrc ss;
1504 char symfs_vmlinux[PATH_MAX];
1505 enum dso_binary_type symtab_type;
1506
1507 if (vmlinux[0] == '/')
1508 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1509 else
1510 symbol__join_symfs(symfs_vmlinux, vmlinux);
1511
1512 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1513 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1514 else
1515 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1516
1517 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1518 return -1;
1519
1520 err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1521 symsrc__destroy(&ss);
1522
1523 if (err > 0) {
1524 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1525 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1526 else
1527 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1528 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1529 dso__set_loaded(dso, map->type);
1530 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1531 }
1532
1533 return err;
1534 }
1535
1536 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1537 symbol_filter_t filter)
1538 {
1539 int i, err = 0;
1540 char *filename = NULL;
1541
1542 if (!symbol_conf.ignore_vmlinux_buildid)
1543 filename = dso__build_id_filename(dso, NULL, 0);
1544 if (filename != NULL) {
1545 err = dso__load_vmlinux(dso, map, filename, true, filter);
1546 if (err > 0)
1547 goto out;
1548 free(filename);
1549 }
1550
1551 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1552 vmlinux_path__nr_entries + 1);
1553
1554 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1555 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1556 if (err > 0)
1557 break;
1558 }
1559 out:
1560 return err;
1561 }
1562
1563 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1564 {
1565 char kallsyms_filename[PATH_MAX];
1566 struct dirent *dent;
1567 int ret = -1;
1568 DIR *d;
1569
1570 d = opendir(dir);
1571 if (!d)
1572 return -1;
1573
1574 while (1) {
1575 dent = readdir(d);
1576 if (!dent)
1577 break;
1578 if (dent->d_type != DT_DIR)
1579 continue;
1580 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1581 "%s/%s/kallsyms", dir, dent->d_name);
1582 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1583 strlcpy(dir, kallsyms_filename, dir_sz);
1584 ret = 0;
1585 break;
1586 }
1587 }
1588
1589 closedir(d);
1590
1591 return ret;
1592 }
1593
1594 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1595 {
1596 u8 host_build_id[BUILD_ID_SIZE];
1597 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1598 bool is_host = false;
1599 char path[PATH_MAX];
1600
1601 if (!dso->has_build_id) {
1602 /*
1603 * Last resort, if we don't have a build-id and couldn't find
1604 * any vmlinux file, try the running kernel kallsyms table.
1605 */
1606 goto proc_kallsyms;
1607 }
1608
1609 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1610 sizeof(host_build_id)) == 0)
1611 is_host = dso__build_id_equal(dso, host_build_id);
1612
1613 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1614
1615 scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1616 sbuild_id);
1617
1618 /* Use /proc/kallsyms if possible */
1619 if (is_host) {
1620 DIR *d;
1621 int fd;
1622
1623 /* If no cached kcore go with /proc/kallsyms */
1624 d = opendir(path);
1625 if (!d)
1626 goto proc_kallsyms;
1627 closedir(d);
1628
1629 /*
1630 * Do not check the build-id cache, until we know we cannot use
1631 * /proc/kcore.
1632 */
1633 fd = open("/proc/kcore", O_RDONLY);
1634 if (fd != -1) {
1635 close(fd);
1636 /* If module maps match go with /proc/kallsyms */
1637 if (!validate_kcore_addresses("/proc/kallsyms", map))
1638 goto proc_kallsyms;
1639 }
1640
1641 /* Find kallsyms in build-id cache with kcore */
1642 if (!find_matching_kcore(map, path, sizeof(path)))
1643 return strdup(path);
1644
1645 goto proc_kallsyms;
1646 }
1647
1648 /* Find kallsyms in build-id cache with kcore */
1649 if (!find_matching_kcore(map, path, sizeof(path)))
1650 return strdup(path);
1651
1652 scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1653 buildid_dir, sbuild_id);
1654
1655 if (access(path, F_OK)) {
1656 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1657 sbuild_id);
1658 return NULL;
1659 }
1660
1661 return strdup(path);
1662
1663 proc_kallsyms:
1664 return strdup("/proc/kallsyms");
1665 }
1666
1667 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1668 symbol_filter_t filter)
1669 {
1670 int err;
1671 const char *kallsyms_filename = NULL;
1672 char *kallsyms_allocated_filename = NULL;
1673 /*
1674 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1675 * it and only it, reporting errors to the user if it cannot be used.
1676 *
1677 * For instance, try to analyse an ARM perf.data file _without_ a
1678 * build-id, or if the user specifies the wrong path to the right
1679 * vmlinux file, obviously we can't fallback to another vmlinux (a
1680 * x86_86 one, on the machine where analysis is being performed, say),
1681 * or worse, /proc/kallsyms.
1682 *
1683 * If the specified file _has_ a build-id and there is a build-id
1684 * section in the perf.data file, we will still do the expected
1685 * validation in dso__load_vmlinux and will bail out if they don't
1686 * match.
1687 */
1688 if (symbol_conf.kallsyms_name != NULL) {
1689 kallsyms_filename = symbol_conf.kallsyms_name;
1690 goto do_kallsyms;
1691 }
1692
1693 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1694 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1695 false, filter);
1696 }
1697
1698 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1699 err = dso__load_vmlinux_path(dso, map, filter);
1700 if (err > 0)
1701 return err;
1702 }
1703
1704 /* do not try local files if a symfs was given */
1705 if (symbol_conf.symfs[0] != 0)
1706 return -1;
1707
1708 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1709 if (!kallsyms_allocated_filename)
1710 return -1;
1711
1712 kallsyms_filename = kallsyms_allocated_filename;
1713
1714 do_kallsyms:
1715 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1716 if (err > 0)
1717 pr_debug("Using %s for symbols\n", kallsyms_filename);
1718 free(kallsyms_allocated_filename);
1719
1720 if (err > 0 && !dso__is_kcore(dso)) {
1721 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1722 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1723 map__fixup_start(map);
1724 map__fixup_end(map);
1725 }
1726
1727 return err;
1728 }
1729
1730 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1731 symbol_filter_t filter)
1732 {
1733 int err;
1734 const char *kallsyms_filename = NULL;
1735 struct machine *machine;
1736 char path[PATH_MAX];
1737
1738 if (!map->groups) {
1739 pr_debug("Guest kernel map hasn't the point to groups\n");
1740 return -1;
1741 }
1742 machine = map->groups->machine;
1743
1744 if (machine__is_default_guest(machine)) {
1745 /*
1746 * if the user specified a vmlinux filename, use it and only
1747 * it, reporting errors to the user if it cannot be used.
1748 * Or use file guest_kallsyms inputted by user on commandline
1749 */
1750 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1751 err = dso__load_vmlinux(dso, map,
1752 symbol_conf.default_guest_vmlinux_name,
1753 false, filter);
1754 return err;
1755 }
1756
1757 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1758 if (!kallsyms_filename)
1759 return -1;
1760 } else {
1761 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1762 kallsyms_filename = path;
1763 }
1764
1765 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1766 if (err > 0)
1767 pr_debug("Using %s for symbols\n", kallsyms_filename);
1768 if (err > 0 && !dso__is_kcore(dso)) {
1769 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1770 machine__mmap_name(machine, path, sizeof(path));
1771 dso__set_long_name(dso, strdup(path), true);
1772 map__fixup_start(map);
1773 map__fixup_end(map);
1774 }
1775
1776 return err;
1777 }
1778
1779 static void vmlinux_path__exit(void)
1780 {
1781 while (--vmlinux_path__nr_entries >= 0)
1782 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1783
1784 zfree(&vmlinux_path);
1785 }
1786
1787 static int vmlinux_path__init(struct perf_session_env *env)
1788 {
1789 struct utsname uts;
1790 char bf[PATH_MAX];
1791 char *kernel_version;
1792
1793 vmlinux_path = malloc(sizeof(char *) * 6);
1794 if (vmlinux_path == NULL)
1795 return -1;
1796
1797 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1798 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1799 goto out_fail;
1800 ++vmlinux_path__nr_entries;
1801 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1802 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1803 goto out_fail;
1804 ++vmlinux_path__nr_entries;
1805
1806 /* only try kernel version if no symfs was given */
1807 if (symbol_conf.symfs[0] != 0)
1808 return 0;
1809
1810 if (env) {
1811 kernel_version = env->os_release;
1812 } else {
1813 if (uname(&uts) < 0)
1814 goto out_fail;
1815
1816 kernel_version = uts.release;
1817 }
1818
1819 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
1820 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1821 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1822 goto out_fail;
1823 ++vmlinux_path__nr_entries;
1824 snprintf(bf, sizeof(bf), "/usr/lib/debug/boot/vmlinux-%s",
1825 kernel_version);
1826 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1827 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1828 goto out_fail;
1829 ++vmlinux_path__nr_entries;
1830 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
1831 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1832 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1833 goto out_fail;
1834 ++vmlinux_path__nr_entries;
1835 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1836 kernel_version);
1837 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1838 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1839 goto out_fail;
1840 ++vmlinux_path__nr_entries;
1841
1842 return 0;
1843
1844 out_fail:
1845 vmlinux_path__exit();
1846 return -1;
1847 }
1848
1849 int setup_list(struct strlist **list, const char *list_str,
1850 const char *list_name)
1851 {
1852 if (list_str == NULL)
1853 return 0;
1854
1855 *list = strlist__new(true, list_str);
1856 if (!*list) {
1857 pr_err("problems parsing %s list\n", list_name);
1858 return -1;
1859 }
1860 return 0;
1861 }
1862
1863 int setup_intlist(struct intlist **list, const char *list_str,
1864 const char *list_name)
1865 {
1866 if (list_str == NULL)
1867 return 0;
1868
1869 *list = intlist__new(list_str);
1870 if (!*list) {
1871 pr_err("problems parsing %s list\n", list_name);
1872 return -1;
1873 }
1874 return 0;
1875 }
1876
1877 static bool symbol__read_kptr_restrict(void)
1878 {
1879 bool value = false;
1880
1881 if (geteuid() != 0) {
1882 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1883 if (fp != NULL) {
1884 char line[8];
1885
1886 if (fgets(line, sizeof(line), fp) != NULL)
1887 value = atoi(line) != 0;
1888
1889 fclose(fp);
1890 }
1891 }
1892
1893 return value;
1894 }
1895
1896 int symbol__init(struct perf_session_env *env)
1897 {
1898 const char *symfs;
1899
1900 if (symbol_conf.initialized)
1901 return 0;
1902
1903 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1904
1905 symbol__elf_init();
1906
1907 if (symbol_conf.sort_by_name)
1908 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1909 sizeof(struct symbol));
1910
1911 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1912 return -1;
1913
1914 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1915 pr_err("'.' is the only non valid --field-separator argument\n");
1916 return -1;
1917 }
1918
1919 if (setup_list(&symbol_conf.dso_list,
1920 symbol_conf.dso_list_str, "dso") < 0)
1921 return -1;
1922
1923 if (setup_list(&symbol_conf.comm_list,
1924 symbol_conf.comm_list_str, "comm") < 0)
1925 goto out_free_dso_list;
1926
1927 if (setup_intlist(&symbol_conf.pid_list,
1928 symbol_conf.pid_list_str, "pid") < 0)
1929 goto out_free_comm_list;
1930
1931 if (setup_intlist(&symbol_conf.tid_list,
1932 symbol_conf.tid_list_str, "tid") < 0)
1933 goto out_free_pid_list;
1934
1935 if (setup_list(&symbol_conf.sym_list,
1936 symbol_conf.sym_list_str, "symbol") < 0)
1937 goto out_free_tid_list;
1938
1939 /*
1940 * A path to symbols of "/" is identical to ""
1941 * reset here for simplicity.
1942 */
1943 symfs = realpath(symbol_conf.symfs, NULL);
1944 if (symfs == NULL)
1945 symfs = symbol_conf.symfs;
1946 if (strcmp(symfs, "/") == 0)
1947 symbol_conf.symfs = "";
1948 if (symfs != symbol_conf.symfs)
1949 free((void *)symfs);
1950
1951 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1952
1953 symbol_conf.initialized = true;
1954 return 0;
1955
1956 out_free_tid_list:
1957 intlist__delete(symbol_conf.tid_list);
1958 out_free_pid_list:
1959 intlist__delete(symbol_conf.pid_list);
1960 out_free_comm_list:
1961 strlist__delete(symbol_conf.comm_list);
1962 out_free_dso_list:
1963 strlist__delete(symbol_conf.dso_list);
1964 return -1;
1965 }
1966
1967 void symbol__exit(void)
1968 {
1969 if (!symbol_conf.initialized)
1970 return;
1971 strlist__delete(symbol_conf.sym_list);
1972 strlist__delete(symbol_conf.dso_list);
1973 strlist__delete(symbol_conf.comm_list);
1974 intlist__delete(symbol_conf.tid_list);
1975 intlist__delete(symbol_conf.pid_list);
1976 vmlinux_path__exit();
1977 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1978 symbol_conf.initialized = false;
1979 }
Linux kernel - Deliverables
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