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perf annotate: Split allocation of annotated_source struct
[linux/fpc-iii.git] / tools / perf / util / symbol.c
blob8c84437f2a100d7812074f40ccc34bcb0dfb8f13
1 // SPDX-License-Identifier: GPL-2.0
2 #include <dirent.h>
3 #include <errno.h>
4 #include <stdlib.h>
5 #include <stdio.h>
6 #include <string.h>
7 #include <linux/kernel.h>
8 #include <linux/mman.h>
9 #include <sys/types.h>
10 #include <sys/stat.h>
11 #include <sys/param.h>
12 #include <fcntl.h>
13 #include <unistd.h>
14 #include <inttypes.h>
15 #include "annotate.h"
16 #include "build-id.h"
17 #include "util.h"
18 #include "debug.h"
19 #include "machine.h"
20 #include "symbol.h"
21 #include "strlist.h"
22 #include "intlist.h"
23 #include "namespaces.h"
24 #include "header.h"
25 #include "path.h"
26 #include "sane_ctype.h"
27
28 #include <elf.h>
29 #include <limits.h>
30 #include <symbol/kallsyms.h>
31 #include <sys/utsname.h>
32
33 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
34 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
35 static bool symbol__is_idle(const char *name);
36
37 int vmlinux_path__nr_entries;
38 char **vmlinux_path;
39
40 struct symbol_conf symbol_conf = {
41 .use_modules = true,
42 .try_vmlinux_path = true,
43 .annotate_src = true,
44 .demangle = true,
45 .demangle_kernel = false,
46 .cumulate_callchain = true,
47 .show_hist_headers = true,
48 .symfs = "",
49 .event_group = true,
50 .inline_name = true,
51 };
52
53 static enum dso_binary_type binary_type_symtab[] = {
54 DSO_BINARY_TYPE__KALLSYMS,
55 DSO_BINARY_TYPE__GUEST_KALLSYMS,
56 DSO_BINARY_TYPE__JAVA_JIT,
57 DSO_BINARY_TYPE__DEBUGLINK,
58 DSO_BINARY_TYPE__BUILD_ID_CACHE,
59 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
60 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
61 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
62 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
63 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
64 DSO_BINARY_TYPE__GUEST_KMODULE,
65 DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
66 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
67 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
68 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
69 DSO_BINARY_TYPE__NOT_FOUND,
70 };
71
72 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
73
74 static bool symbol_type__filter(char symbol_type)
75 {
76 symbol_type = toupper(symbol_type);
77 return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D';
78 }
79
80 static int prefix_underscores_count(const char *str)
81 {
82 const char *tail = str;
83
84 while (*tail == '_')
85 tail++;
86
87 return tail - str;
88 }
89
90 const char * __weak arch__normalize_symbol_name(const char *name)
91 {
92 return name;
93 }
94
95 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
96 {
97 return strcmp(namea, nameb);
98 }
99
100 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
101 unsigned int n)
102 {
103 return strncmp(namea, nameb, n);
104 }
105
106 int __weak arch__choose_best_symbol(struct symbol *syma,
107 struct symbol *symb __maybe_unused)
108 {
109 /* Avoid "SyS" kernel syscall aliases */
110 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
111 return SYMBOL_B;
112 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
113 return SYMBOL_B;
114
115 return SYMBOL_A;
116 }
117
118 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
119 {
120 s64 a;
121 s64 b;
122 size_t na, nb;
123
124 /* Prefer a symbol with non zero length */
125 a = syma->end - syma->start;
126 b = symb->end - symb->start;
127 if ((b == 0) && (a > 0))
128 return SYMBOL_A;
129 else if ((a == 0) && (b > 0))
130 return SYMBOL_B;
131
132 /* Prefer a non weak symbol over a weak one */
133 a = syma->binding == STB_WEAK;
134 b = symb->binding == STB_WEAK;
135 if (b && !a)
136 return SYMBOL_A;
137 if (a && !b)
138 return SYMBOL_B;
139
140 /* Prefer a global symbol over a non global one */
141 a = syma->binding == STB_GLOBAL;
142 b = symb->binding == STB_GLOBAL;
143 if (a && !b)
144 return SYMBOL_A;
145 if (b && !a)
146 return SYMBOL_B;
147
148 /* Prefer a symbol with less underscores */
149 a = prefix_underscores_count(syma->name);
150 b = prefix_underscores_count(symb->name);
151 if (b > a)
152 return SYMBOL_A;
153 else if (a > b)
154 return SYMBOL_B;
155
156 /* Choose the symbol with the longest name */
157 na = strlen(syma->name);
158 nb = strlen(symb->name);
159 if (na > nb)
160 return SYMBOL_A;
161 else if (na < nb)
162 return SYMBOL_B;
163
164 return arch__choose_best_symbol(syma, symb);
165 }
166
167 void symbols__fixup_duplicate(struct rb_root *symbols)
168 {
169 struct rb_node *nd;
170 struct symbol *curr, *next;
171
172 if (symbol_conf.allow_aliases)
173 return;
174
175 nd = rb_first(symbols);
176
177 while (nd) {
178 curr = rb_entry(nd, struct symbol, rb_node);
179 again:
180 nd = rb_next(&curr->rb_node);
181 next = rb_entry(nd, struct symbol, rb_node);
182
183 if (!nd)
184 break;
185
186 if (curr->start != next->start)
187 continue;
188
189 if (choose_best_symbol(curr, next) == SYMBOL_A) {
190 rb_erase(&next->rb_node, symbols);
191 symbol__delete(next);
192 goto again;
193 } else {
194 nd = rb_next(&curr->rb_node);
195 rb_erase(&curr->rb_node, symbols);
196 symbol__delete(curr);
197 }
198 }
199 }
200
201 void symbols__fixup_end(struct rb_root *symbols)
202 {
203 struct rb_node *nd, *prevnd = rb_first(symbols);
204 struct symbol *curr, *prev;
205
206 if (prevnd == NULL)
207 return;
208
209 curr = rb_entry(prevnd, struct symbol, rb_node);
210
211 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
212 prev = curr;
213 curr = rb_entry(nd, struct symbol, rb_node);
214
215 if (prev->end == prev->start && prev->end != curr->start)
216 prev->end = curr->start;
217 }
218
219 /* Last entry */
220 if (curr->end == curr->start)
221 curr->end = roundup(curr->start, 4096) + 4096;
222 }
223
224 void map_groups__fixup_end(struct map_groups *mg)
225 {
226 struct maps *maps = &mg->maps;
227 struct map *next, *curr;
228
229 down_write(&maps->lock);
230
231 curr = maps__first(maps);
232 if (curr == NULL)
233 goto out_unlock;
234
235 for (next = map__next(curr); next; next = map__next(curr)) {
236 if (!curr->end)
237 curr->end = next->start;
238 curr = next;
239 }
240
241 /*
242 * We still haven't the actual symbols, so guess the
243 * last map final address.
244 */
245 if (!curr->end)
246 curr->end = ~0ULL;
247
248 out_unlock:
249 up_write(&maps->lock);
250 }
251
252 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
253 {
254 size_t namelen = strlen(name) + 1;
255 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
256 sizeof(*sym) + namelen));
257 if (sym == NULL)
258 return NULL;
259
260 if (symbol_conf.priv_size) {
261 if (symbol_conf.init_annotation) {
262 struct annotation *notes = (void *)sym;
263 pthread_mutex_init(&notes->lock, NULL);
264 }
265 sym = ((void *)sym) + symbol_conf.priv_size;
266 }
267
268 sym->start = start;
269 sym->end = len ? start + len : start;
270 sym->type = type;
271 sym->binding = binding;
272 sym->namelen = namelen - 1;
273
274 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
275 __func__, name, start, sym->end);
276 memcpy(sym->name, name, namelen);
277
278 return sym;
279 }
280
281 void symbol__delete(struct symbol *sym)
282 {
283 free(((void *)sym) - symbol_conf.priv_size);
284 }
285
286 void symbols__delete(struct rb_root *symbols)
287 {
288 struct symbol *pos;
289 struct rb_node *next = rb_first(symbols);
290
291 while (next) {
292 pos = rb_entry(next, struct symbol, rb_node);
293 next = rb_next(&pos->rb_node);
294 rb_erase(&pos->rb_node, symbols);
295 symbol__delete(pos);
296 }
297 }
298
299 void __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel)
300 {
301 struct rb_node **p = &symbols->rb_node;
302 struct rb_node *parent = NULL;
303 const u64 ip = sym->start;
304 struct symbol *s;
305
306 if (kernel) {
307 const char *name = sym->name;
308 /*
309 * ppc64 uses function descriptors and appends a '.' to the
310 * start of every instruction address. Remove it.
311 */
312 if (name[0] == '.')
313 name++;
314 sym->idle = symbol__is_idle(name);
315 }
316
317 while (*p != NULL) {
318 parent = *p;
319 s = rb_entry(parent, struct symbol, rb_node);
320 if (ip < s->start)
321 p = &(*p)->rb_left;
322 else
323 p = &(*p)->rb_right;
324 }
325 rb_link_node(&sym->rb_node, parent, p);
326 rb_insert_color(&sym->rb_node, symbols);
327 }
328
329 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
330 {
331 __symbols__insert(symbols, sym, false);
332 }
333
334 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
335 {
336 struct rb_node *n;
337
338 if (symbols == NULL)
339 return NULL;
340
341 n = symbols->rb_node;
342
343 while (n) {
344 struct symbol *s = rb_entry(n, struct symbol, rb_node);
345
346 if (ip < s->start)
347 n = n->rb_left;
348 else if (ip > s->end || (ip == s->end && ip != s->start))
349 n = n->rb_right;
350 else
351 return s;
352 }
353
354 return NULL;
355 }
356
357 static struct symbol *symbols__first(struct rb_root *symbols)
358 {
359 struct rb_node *n = rb_first(symbols);
360
361 if (n)
362 return rb_entry(n, struct symbol, rb_node);
363
364 return NULL;
365 }
366
367 static struct symbol *symbols__last(struct rb_root *symbols)
368 {
369 struct rb_node *n = rb_last(symbols);
370
371 if (n)
372 return rb_entry(n, struct symbol, rb_node);
373
374 return NULL;
375 }
376
377 static struct symbol *symbols__next(struct symbol *sym)
378 {
379 struct rb_node *n = rb_next(&sym->rb_node);
380
381 if (n)
382 return rb_entry(n, struct symbol, rb_node);
383
384 return NULL;
385 }
386
387 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
388 {
389 struct rb_node **p = &symbols->rb_node;
390 struct rb_node *parent = NULL;
391 struct symbol_name_rb_node *symn, *s;
392
393 symn = container_of(sym, struct symbol_name_rb_node, sym);
394
395 while (*p != NULL) {
396 parent = *p;
397 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
398 if (strcmp(sym->name, s->sym.name) < 0)
399 p = &(*p)->rb_left;
400 else
401 p = &(*p)->rb_right;
402 }
403 rb_link_node(&symn->rb_node, parent, p);
404 rb_insert_color(&symn->rb_node, symbols);
405 }
406
407 static void symbols__sort_by_name(struct rb_root *symbols,
408 struct rb_root *source)
409 {
410 struct rb_node *nd;
411
412 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
413 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
414 symbols__insert_by_name(symbols, pos);
415 }
416 }
417
418 int symbol__match_symbol_name(const char *name, const char *str,
419 enum symbol_tag_include includes)
420 {
421 const char *versioning;
422
423 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
424 (versioning = strstr(name, "@@"))) {
425 int len = strlen(str);
426
427 if (len < versioning - name)
428 len = versioning - name;
429
430 return arch__compare_symbol_names_n(name, str, len);
431 } else
432 return arch__compare_symbol_names(name, str);
433 }
434
435 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
436 const char *name,
437 enum symbol_tag_include includes)
438 {
439 struct rb_node *n;
440 struct symbol_name_rb_node *s = NULL;
441
442 if (symbols == NULL)
443 return NULL;
444
445 n = symbols->rb_node;
446
447 while (n) {
448 int cmp;
449
450 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
451 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
452
453 if (cmp > 0)
454 n = n->rb_left;
455 else if (cmp < 0)
456 n = n->rb_right;
457 else
458 break;
459 }
460
461 if (n == NULL)
462 return NULL;
463
464 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
465 /* return first symbol that has same name (if any) */
466 for (n = rb_prev(n); n; n = rb_prev(n)) {
467 struct symbol_name_rb_node *tmp;
468
469 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
470 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
471 break;
472
473 s = tmp;
474 }
475
476 return &s->sym;
477 }
478
479 void dso__reset_find_symbol_cache(struct dso *dso)
480 {
481 dso->last_find_result.addr = 0;
482 dso->last_find_result.symbol = NULL;
483 }
484
485 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
486 {
487 __symbols__insert(&dso->symbols, sym, dso->kernel);
488
489 /* update the symbol cache if necessary */
490 if (dso->last_find_result.addr >= sym->start &&
491 (dso->last_find_result.addr < sym->end ||
492 sym->start == sym->end)) {
493 dso->last_find_result.symbol = sym;
494 }
495 }
496
497 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
498 {
499 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
500 dso->last_find_result.addr = addr;
501 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
502 }
503
504 return dso->last_find_result.symbol;
505 }
506
507 struct symbol *dso__first_symbol(struct dso *dso)
508 {
509 return symbols__first(&dso->symbols);
510 }
511
512 struct symbol *dso__last_symbol(struct dso *dso)
513 {
514 return symbols__last(&dso->symbols);
515 }
516
517 struct symbol *dso__next_symbol(struct symbol *sym)
518 {
519 return symbols__next(sym);
520 }
521
522 struct symbol *symbol__next_by_name(struct symbol *sym)
523 {
524 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
525 struct rb_node *n = rb_next(&s->rb_node);
526
527 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
528 }
529
530 /*
531 * Returns first symbol that matched with @name.
532 */
533 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
534 {
535 struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
536 SYMBOL_TAG_INCLUDE__NONE);
537 if (!s)
538 s = symbols__find_by_name(&dso->symbol_names, name,
539 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
540 return s;
541 }
542
543 void dso__sort_by_name(struct dso *dso)
544 {
545 dso__set_sorted_by_name(dso);
546 return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
547 }
548
549 int modules__parse(const char *filename, void *arg,
550 int (*process_module)(void *arg, const char *name,
551 u64 start, u64 size))
552 {
553 char *line = NULL;
554 size_t n;
555 FILE *file;
556 int err = 0;
557
558 file = fopen(filename, "r");
559 if (file == NULL)
560 return -1;
561
562 while (1) {
563 char name[PATH_MAX];
564 u64 start, size;
565 char *sep, *endptr;
566 ssize_t line_len;
567
568 line_len = getline(&line, &n, file);
569 if (line_len < 0) {
570 if (feof(file))
571 break;
572 err = -1;
573 goto out;
574 }
575
576 if (!line) {
577 err = -1;
578 goto out;
579 }
580
581 line[--line_len] = '\0'; /* \n */
582
583 sep = strrchr(line, 'x');
584 if (sep == NULL)
585 continue;
586
587 hex2u64(sep + 1, &start);
588
589 sep = strchr(line, ' ');
590 if (sep == NULL)
591 continue;
592
593 *sep = '\0';
594
595 scnprintf(name, sizeof(name), "[%s]", line);
596
597 size = strtoul(sep + 1, &endptr, 0);
598 if (*endptr != ' ' && *endptr != '\t')
599 continue;
600
601 err = process_module(arg, name, start, size);
602 if (err)
603 break;
604 }
605 out:
606 free(line);
607 fclose(file);
608 return err;
609 }
610
611 /*
612 * These are symbols in the kernel image, so make sure that
613 * sym is from a kernel DSO.
614 */
615 static bool symbol__is_idle(const char *name)
616 {
617 const char * const idle_symbols[] = {
618 "cpu_idle",
619 "cpu_startup_entry",
620 "intel_idle",
621 "default_idle",
622 "native_safe_halt",
623 "enter_idle",
624 "exit_idle",
625 "mwait_idle",
626 "mwait_idle_with_hints",
627 "poll_idle",
628 "ppc64_runlatch_off",
629 "pseries_dedicated_idle_sleep",
630 NULL
631 };
632 int i;
633
634 for (i = 0; idle_symbols[i]; i++) {
635 if (!strcmp(idle_symbols[i], name))
636 return true;
637 }
638
639 return false;
640 }
641
642 static int map__process_kallsym_symbol(void *arg, const char *name,
643 char type, u64 start)
644 {
645 struct symbol *sym;
646 struct dso *dso = arg;
647 struct rb_root *root = &dso->symbols;
648
649 if (!symbol_type__filter(type))
650 return 0;
651
652 /*
653 * module symbols are not sorted so we add all
654 * symbols, setting length to 0, and rely on
655 * symbols__fixup_end() to fix it up.
656 */
657 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
658 if (sym == NULL)
659 return -ENOMEM;
660 /*
661 * We will pass the symbols to the filter later, in
662 * map__split_kallsyms, when we have split the maps per module
663 */
664 __symbols__insert(root, sym, !strchr(name, '['));
665
666 return 0;
667 }
668
669 /*
670 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
671 * so that we can in the next step set the symbol ->end address and then
672 * call kernel_maps__split_kallsyms.
673 */
674 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
675 {
676 return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
677 }
678
679 static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
680 {
681 struct map *curr_map;
682 struct symbol *pos;
683 int count = 0;
684 struct rb_root old_root = dso->symbols;
685 struct rb_root *root = &dso->symbols;
686 struct rb_node *next = rb_first(root);
687
688 if (!kmaps)
689 return -1;
690
691 *root = RB_ROOT;
692
693 while (next) {
694 char *module;
695
696 pos = rb_entry(next, struct symbol, rb_node);
697 next = rb_next(&pos->rb_node);
698
699 rb_erase_init(&pos->rb_node, &old_root);
700
701 module = strchr(pos->name, '\t');
702 if (module)
703 *module = '\0';
704
705 curr_map = map_groups__find(kmaps, pos->start);
706
707 if (!curr_map) {
708 symbol__delete(pos);
709 continue;
710 }
711
712 pos->start -= curr_map->start - curr_map->pgoff;
713 if (pos->end)
714 pos->end -= curr_map->start - curr_map->pgoff;
715 symbols__insert(&curr_map->dso->symbols, pos);
716 ++count;
717 }
718
719 /* Symbols have been adjusted */
720 dso->adjust_symbols = 1;
721
722 return count;
723 }
724
725 /*
726 * Split the symbols into maps, making sure there are no overlaps, i.e. the
727 * kernel range is broken in several maps, named [kernel].N, as we don't have
728 * the original ELF section names vmlinux have.
729 */
730 static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
731 struct map *initial_map)
732 {
733 struct machine *machine;
734 struct map *curr_map = initial_map;
735 struct symbol *pos;
736 int count = 0, moved = 0;
737 struct rb_root *root = &dso->symbols;
738 struct rb_node *next = rb_first(root);
739 int kernel_range = 0;
740 bool x86_64;
741
742 if (!kmaps)
743 return -1;
744
745 machine = kmaps->machine;
746
747 x86_64 = machine__is(machine, "x86_64");
748
749 while (next) {
750 char *module;
751
752 pos = rb_entry(next, struct symbol, rb_node);
753 next = rb_next(&pos->rb_node);
754
755 module = strchr(pos->name, '\t');
756 if (module) {
757 if (!symbol_conf.use_modules)
758 goto discard_symbol;
759
760 *module++ = '\0';
761
762 if (strcmp(curr_map->dso->short_name, module)) {
763 if (curr_map != initial_map &&
764 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
765 machine__is_default_guest(machine)) {
766 /*
767 * We assume all symbols of a module are
768 * continuous in * kallsyms, so curr_map
769 * points to a module and all its
770 * symbols are in its kmap. Mark it as
771 * loaded.
772 */
773 dso__set_loaded(curr_map->dso);
774 }
775
776 curr_map = map_groups__find_by_name(kmaps, module);
777 if (curr_map == NULL) {
778 pr_debug("%s/proc/{kallsyms,modules} "
779 "inconsistency while looking "
780 "for \"%s\" module!\n",
781 machine->root_dir, module);
782 curr_map = initial_map;
783 goto discard_symbol;
784 }
785
786 if (curr_map->dso->loaded &&
787 !machine__is_default_guest(machine))
788 goto discard_symbol;
789 }
790 /*
791 * So that we look just like we get from .ko files,
792 * i.e. not prelinked, relative to initial_map->start.
793 */
794 pos->start = curr_map->map_ip(curr_map, pos->start);
795 pos->end = curr_map->map_ip(curr_map, pos->end);
796 } else if (x86_64 && is_entry_trampoline(pos->name)) {
797 /*
798 * These symbols are not needed anymore since the
799 * trampoline maps refer to the text section and it's
800 * symbols instead. Avoid having to deal with
801 * relocations, and the assumption that the first symbol
802 * is the start of kernel text, by simply removing the
803 * symbols at this point.
804 */
805 goto discard_symbol;
806 } else if (curr_map != initial_map) {
807 char dso_name[PATH_MAX];
808 struct dso *ndso;
809
810 if (delta) {
811 /* Kernel was relocated at boot time */
812 pos->start -= delta;
813 pos->end -= delta;
814 }
815
816 if (count == 0) {
817 curr_map = initial_map;
818 goto add_symbol;
819 }
820
821 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
822 snprintf(dso_name, sizeof(dso_name),
823 "[guest.kernel].%d",
824 kernel_range++);
825 else
826 snprintf(dso_name, sizeof(dso_name),
827 "[kernel].%d",
828 kernel_range++);
829
830 ndso = dso__new(dso_name);
831 if (ndso == NULL)
832 return -1;
833
834 ndso->kernel = dso->kernel;
835
836 curr_map = map__new2(pos->start, ndso);
837 if (curr_map == NULL) {
838 dso__put(ndso);
839 return -1;
840 }
841
842 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
843 map_groups__insert(kmaps, curr_map);
844 ++kernel_range;
845 } else if (delta) {
846 /* Kernel was relocated at boot time */
847 pos->start -= delta;
848 pos->end -= delta;
849 }
850 add_symbol:
851 if (curr_map != initial_map) {
852 rb_erase(&pos->rb_node, root);
853 symbols__insert(&curr_map->dso->symbols, pos);
854 ++moved;
855 } else
856 ++count;
857
858 continue;
859 discard_symbol:
860 rb_erase(&pos->rb_node, root);
861 symbol__delete(pos);
862 }
863
864 if (curr_map != initial_map &&
865 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
866 machine__is_default_guest(kmaps->machine)) {
867 dso__set_loaded(curr_map->dso);
868 }
869
870 return count + moved;
871 }
872
873 bool symbol__restricted_filename(const char *filename,
874 const char *restricted_filename)
875 {
876 bool restricted = false;
877
878 if (symbol_conf.kptr_restrict) {
879 char *r = realpath(filename, NULL);
880
881 if (r != NULL) {
882 restricted = strcmp(r, restricted_filename) == 0;
883 free(r);
884 return restricted;
885 }
886 }
887
888 return restricted;
889 }
890
891 struct module_info {
892 struct rb_node rb_node;
893 char *name;
894 u64 start;
895 };
896
897 static void add_module(struct module_info *mi, struct rb_root *modules)
898 {
899 struct rb_node **p = &modules->rb_node;
900 struct rb_node *parent = NULL;
901 struct module_info *m;
902
903 while (*p != NULL) {
904 parent = *p;
905 m = rb_entry(parent, struct module_info, rb_node);
906 if (strcmp(mi->name, m->name) < 0)
907 p = &(*p)->rb_left;
908 else
909 p = &(*p)->rb_right;
910 }
911 rb_link_node(&mi->rb_node, parent, p);
912 rb_insert_color(&mi->rb_node, modules);
913 }
914
915 static void delete_modules(struct rb_root *modules)
916 {
917 struct module_info *mi;
918 struct rb_node *next = rb_first(modules);
919
920 while (next) {
921 mi = rb_entry(next, struct module_info, rb_node);
922 next = rb_next(&mi->rb_node);
923 rb_erase(&mi->rb_node, modules);
924 zfree(&mi->name);
925 free(mi);
926 }
927 }
928
929 static struct module_info *find_module(const char *name,
930 struct rb_root *modules)
931 {
932 struct rb_node *n = modules->rb_node;
933
934 while (n) {
935 struct module_info *m;
936 int cmp;
937
938 m = rb_entry(n, struct module_info, rb_node);
939 cmp = strcmp(name, m->name);
940 if (cmp < 0)
941 n = n->rb_left;
942 else if (cmp > 0)
943 n = n->rb_right;
944 else
945 return m;
946 }
947
948 return NULL;
949 }
950
951 static int __read_proc_modules(void *arg, const char *name, u64 start,
952 u64 size __maybe_unused)
953 {
954 struct rb_root *modules = arg;
955 struct module_info *mi;
956
957 mi = zalloc(sizeof(struct module_info));
958 if (!mi)
959 return -ENOMEM;
960
961 mi->name = strdup(name);
962 mi->start = start;
963
964 if (!mi->name) {
965 free(mi);
966 return -ENOMEM;
967 }
968
969 add_module(mi, modules);
970
971 return 0;
972 }
973
974 static int read_proc_modules(const char *filename, struct rb_root *modules)
975 {
976 if (symbol__restricted_filename(filename, "/proc/modules"))
977 return -1;
978
979 if (modules__parse(filename, modules, __read_proc_modules)) {
980 delete_modules(modules);
981 return -1;
982 }
983
984 return 0;
985 }
986
987 int compare_proc_modules(const char *from, const char *to)
988 {
989 struct rb_root from_modules = RB_ROOT;
990 struct rb_root to_modules = RB_ROOT;
991 struct rb_node *from_node, *to_node;
992 struct module_info *from_m, *to_m;
993 int ret = -1;
994
995 if (read_proc_modules(from, &from_modules))
996 return -1;
997
998 if (read_proc_modules(to, &to_modules))
999 goto out_delete_from;
1000
1001 from_node = rb_first(&from_modules);
1002 to_node = rb_first(&to_modules);
1003 while (from_node) {
1004 if (!to_node)
1005 break;
1006
1007 from_m = rb_entry(from_node, struct module_info, rb_node);
1008 to_m = rb_entry(to_node, struct module_info, rb_node);
1009
1010 if (from_m->start != to_m->start ||
1011 strcmp(from_m->name, to_m->name))
1012 break;
1013
1014 from_node = rb_next(from_node);
1015 to_node = rb_next(to_node);
1016 }
1017
1018 if (!from_node && !to_node)
1019 ret = 0;
1020
1021 delete_modules(&to_modules);
1022 out_delete_from:
1023 delete_modules(&from_modules);
1024
1025 return ret;
1026 }
1027
1028 struct map *map_groups__first(struct map_groups *mg)
1029 {
1030 return maps__first(&mg->maps);
1031 }
1032
1033 static int do_validate_kcore_modules(const char *filename,
1034 struct map_groups *kmaps)
1035 {
1036 struct rb_root modules = RB_ROOT;
1037 struct map *old_map;
1038 int err;
1039
1040 err = read_proc_modules(filename, &modules);
1041 if (err)
1042 return err;
1043
1044 old_map = map_groups__first(kmaps);
1045 while (old_map) {
1046 struct map *next = map_groups__next(old_map);
1047 struct module_info *mi;
1048
1049 if (!__map__is_kmodule(old_map)) {
1050 old_map = next;
1051 continue;
1052 }
1053
1054 /* Module must be in memory at the same address */
1055 mi = find_module(old_map->dso->short_name, &modules);
1056 if (!mi || mi->start != old_map->start) {
1057 err = -EINVAL;
1058 goto out;
1059 }
1060
1061 old_map = next;
1062 }
1063 out:
1064 delete_modules(&modules);
1065 return err;
1066 }
1067
1068 /*
1069 * If kallsyms is referenced by name then we look for filename in the same
1070 * directory.
1071 */
1072 static bool filename_from_kallsyms_filename(char *filename,
1073 const char *base_name,
1074 const char *kallsyms_filename)
1075 {
1076 char *name;
1077
1078 strcpy(filename, kallsyms_filename);
1079 name = strrchr(filename, '/');
1080 if (!name)
1081 return false;
1082
1083 name += 1;
1084
1085 if (!strcmp(name, "kallsyms")) {
1086 strcpy(name, base_name);
1087 return true;
1088 }
1089
1090 return false;
1091 }
1092
1093 static int validate_kcore_modules(const char *kallsyms_filename,
1094 struct map *map)
1095 {
1096 struct map_groups *kmaps = map__kmaps(map);
1097 char modules_filename[PATH_MAX];
1098
1099 if (!kmaps)
1100 return -EINVAL;
1101
1102 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1103 kallsyms_filename))
1104 return -EINVAL;
1105
1106 if (do_validate_kcore_modules(modules_filename, kmaps))
1107 return -EINVAL;
1108
1109 return 0;
1110 }
1111
1112 static int validate_kcore_addresses(const char *kallsyms_filename,
1113 struct map *map)
1114 {
1115 struct kmap *kmap = map__kmap(map);
1116
1117 if (!kmap)
1118 return -EINVAL;
1119
1120 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1121 u64 start;
1122
1123 if (kallsyms__get_function_start(kallsyms_filename,
1124 kmap->ref_reloc_sym->name, &start))
1125 return -ENOENT;
1126 if (start != kmap->ref_reloc_sym->addr)
1127 return -EINVAL;
1128 }
1129
1130 return validate_kcore_modules(kallsyms_filename, map);
1131 }
1132
1133 struct kcore_mapfn_data {
1134 struct dso *dso;
1135 struct list_head maps;
1136 };
1137
1138 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1139 {
1140 struct kcore_mapfn_data *md = data;
1141 struct map *map;
1142
1143 map = map__new2(start, md->dso);
1144 if (map == NULL)
1145 return -ENOMEM;
1146
1147 map->end = map->start + len;
1148 map->pgoff = pgoff;
1149
1150 list_add(&map->node, &md->maps);
1151
1152 return 0;
1153 }
1154
1155 static int dso__load_kcore(struct dso *dso, struct map *map,
1156 const char *kallsyms_filename)
1157 {
1158 struct map_groups *kmaps = map__kmaps(map);
1159 struct kcore_mapfn_data md;
1160 struct map *old_map, *new_map, *replacement_map = NULL;
1161 struct machine *machine;
1162 bool is_64_bit;
1163 int err, fd;
1164 char kcore_filename[PATH_MAX];
1165 u64 stext;
1166
1167 if (!kmaps)
1168 return -EINVAL;
1169
1170 machine = kmaps->machine;
1171
1172 /* This function requires that the map is the kernel map */
1173 if (!__map__is_kernel(map))
1174 return -EINVAL;
1175
1176 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1177 kallsyms_filename))
1178 return -EINVAL;
1179
1180 /* Modules and kernel must be present at their original addresses */
1181 if (validate_kcore_addresses(kallsyms_filename, map))
1182 return -EINVAL;
1183
1184 md.dso = dso;
1185 INIT_LIST_HEAD(&md.maps);
1186
1187 fd = open(kcore_filename, O_RDONLY);
1188 if (fd < 0) {
1189 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1190 kcore_filename);
1191 return -EINVAL;
1192 }
1193
1194 /* Read new maps into temporary lists */
1195 err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1196 &is_64_bit);
1197 if (err)
1198 goto out_err;
1199 dso->is_64_bit = is_64_bit;
1200
1201 if (list_empty(&md.maps)) {
1202 err = -EINVAL;
1203 goto out_err;
1204 }
1205
1206 /* Remove old maps */
1207 old_map = map_groups__first(kmaps);
1208 while (old_map) {
1209 struct map *next = map_groups__next(old_map);
1210
1211 if (old_map != map)
1212 map_groups__remove(kmaps, old_map);
1213 old_map = next;
1214 }
1215 machine->trampolines_mapped = false;
1216
1217 /* Find the kernel map using the '_stext' symbol */
1218 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1219 list_for_each_entry(new_map, &md.maps, node) {
1220 if (stext >= new_map->start && stext < new_map->end) {
1221 replacement_map = new_map;
1222 break;
1223 }
1224 }
1225 }
1226
1227 if (!replacement_map)
1228 replacement_map = list_entry(md.maps.next, struct map, node);
1229
1230 /* Add new maps */
1231 while (!list_empty(&md.maps)) {
1232 new_map = list_entry(md.maps.next, struct map, node);
1233 list_del_init(&new_map->node);
1234 if (new_map == replacement_map) {
1235 map->start = new_map->start;
1236 map->end = new_map->end;
1237 map->pgoff = new_map->pgoff;
1238 map->map_ip = new_map->map_ip;
1239 map->unmap_ip = new_map->unmap_ip;
1240 /* Ensure maps are correctly ordered */
1241 map__get(map);
1242 map_groups__remove(kmaps, map);
1243 map_groups__insert(kmaps, map);
1244 map__put(map);
1245 } else {
1246 map_groups__insert(kmaps, new_map);
1247 }
1248
1249 map__put(new_map);
1250 }
1251
1252 if (machine__is(machine, "x86_64")) {
1253 u64 addr;
1254
1255 /*
1256 * If one of the corresponding symbols is there, assume the
1257 * entry trampoline maps are too.
1258 */
1259 if (!kallsyms__get_function_start(kallsyms_filename,
1260 ENTRY_TRAMPOLINE_NAME,
1261 &addr))
1262 machine->trampolines_mapped = true;
1263 }
1264
1265 /*
1266 * Set the data type and long name so that kcore can be read via
1267 * dso__data_read_addr().
1268 */
1269 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1270 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1271 else
1272 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1273 dso__set_long_name(dso, strdup(kcore_filename), true);
1274
1275 close(fd);
1276
1277 if (map->prot & PROT_EXEC)
1278 pr_debug("Using %s for kernel object code\n", kcore_filename);
1279 else
1280 pr_debug("Using %s for kernel data\n", kcore_filename);
1281
1282 return 0;
1283
1284 out_err:
1285 while (!list_empty(&md.maps)) {
1286 map = list_entry(md.maps.next, struct map, node);
1287 list_del_init(&map->node);
1288 map__put(map);
1289 }
1290 close(fd);
1291 return -EINVAL;
1292 }
1293
1294 /*
1295 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1296 * delta based on the relocation reference symbol.
1297 */
1298 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1299 {
1300 u64 addr;
1301
1302 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1303 return 0;
1304
1305 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1306 return -1;
1307
1308 *delta = addr - kmap->ref_reloc_sym->addr;
1309 return 0;
1310 }
1311
1312 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1313 struct map *map, bool no_kcore)
1314 {
1315 struct kmap *kmap = map__kmap(map);
1316 u64 delta = 0;
1317
1318 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1319 return -1;
1320
1321 if (!kmap || !kmap->kmaps)
1322 return -1;
1323
1324 if (dso__load_all_kallsyms(dso, filename) < 0)
1325 return -1;
1326
1327 if (kallsyms__delta(kmap, filename, &delta))
1328 return -1;
1329
1330 symbols__fixup_end(&dso->symbols);
1331 symbols__fixup_duplicate(&dso->symbols);
1332
1333 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1334 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1335 else
1336 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1337
1338 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1339 return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
1340 else
1341 return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
1342 }
1343
1344 int dso__load_kallsyms(struct dso *dso, const char *filename,
1345 struct map *map)
1346 {
1347 return __dso__load_kallsyms(dso, filename, map, false);
1348 }
1349
1350 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1351 {
1352 char *line = NULL;
1353 size_t n;
1354 FILE *file;
1355 int nr_syms = 0;
1356
1357 file = fopen(map_path, "r");
1358 if (file == NULL)
1359 goto out_failure;
1360
1361 while (!feof(file)) {
1362 u64 start, size;
1363 struct symbol *sym;
1364 int line_len, len;
1365
1366 line_len = getline(&line, &n, file);
1367 if (line_len < 0)
1368 break;
1369
1370 if (!line)
1371 goto out_failure;
1372
1373 line[--line_len] = '\0'; /* \n */
1374
1375 len = hex2u64(line, &start);
1376
1377 len++;
1378 if (len + 2 >= line_len)
1379 continue;
1380
1381 len += hex2u64(line + len, &size);
1382
1383 len++;
1384 if (len + 2 >= line_len)
1385 continue;
1386
1387 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1388
1389 if (sym == NULL)
1390 goto out_delete_line;
1391
1392 symbols__insert(&dso->symbols, sym);
1393 nr_syms++;
1394 }
1395
1396 free(line);
1397 fclose(file);
1398
1399 return nr_syms;
1400
1401 out_delete_line:
1402 free(line);
1403 out_failure:
1404 return -1;
1405 }
1406
1407 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1408 enum dso_binary_type type)
1409 {
1410 switch (type) {
1411 case DSO_BINARY_TYPE__JAVA_JIT:
1412 case DSO_BINARY_TYPE__DEBUGLINK:
1413 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1414 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1415 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1416 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1417 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1418 return !kmod && dso->kernel == DSO_TYPE_USER;
1419
1420 case DSO_BINARY_TYPE__KALLSYMS:
1421 case DSO_BINARY_TYPE__VMLINUX:
1422 case DSO_BINARY_TYPE__KCORE:
1423 return dso->kernel == DSO_TYPE_KERNEL;
1424
1425 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1426 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1427 case DSO_BINARY_TYPE__GUEST_KCORE:
1428 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1429
1430 case DSO_BINARY_TYPE__GUEST_KMODULE:
1431 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1432 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1433 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1434 /*
1435 * kernel modules know their symtab type - it's set when
1436 * creating a module dso in machine__findnew_module_map().
1437 */
1438 return kmod && dso->symtab_type == type;
1439
1440 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1441 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1442 return true;
1443
1444 case DSO_BINARY_TYPE__NOT_FOUND:
1445 default:
1446 return false;
1447 }
1448 }
1449
1450 /* Checks for the existence of the perf-<pid>.map file in two different
1451 * locations. First, if the process is a separate mount namespace, check in
1452 * that namespace using the pid of the innermost pid namespace. If's not in a
1453 * namespace, or the file can't be found there, try in the mount namespace of
1454 * the tracing process using our view of its pid.
1455 */
1456 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1457 struct nsinfo **nsip)
1458 {
1459 struct nscookie nsc;
1460 struct nsinfo *nsi;
1461 struct nsinfo *nnsi;
1462 int rc = -1;
1463
1464 nsi = *nsip;
1465
1466 if (nsi->need_setns) {
1467 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1468 nsinfo__mountns_enter(nsi, &nsc);
1469 rc = access(filebuf, R_OK);
1470 nsinfo__mountns_exit(&nsc);
1471 if (rc == 0)
1472 return rc;
1473 }
1474
1475 nnsi = nsinfo__copy(nsi);
1476 if (nnsi) {
1477 nsinfo__put(nsi);
1478
1479 nnsi->need_setns = false;
1480 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1481 *nsip = nnsi;
1482 rc = 0;
1483 }
1484
1485 return rc;
1486 }
1487
1488 int dso__load(struct dso *dso, struct map *map)
1489 {
1490 char *name;
1491 int ret = -1;
1492 u_int i;
1493 struct machine *machine;
1494 char *root_dir = (char *) "";
1495 int ss_pos = 0;
1496 struct symsrc ss_[2];
1497 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1498 bool kmod;
1499 bool perfmap;
1500 unsigned char build_id[BUILD_ID_SIZE];
1501 struct nscookie nsc;
1502 char newmapname[PATH_MAX];
1503 const char *map_path = dso->long_name;
1504
1505 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1506 if (perfmap) {
1507 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1508 sizeof(newmapname), &dso->nsinfo) == 0)) {
1509 map_path = newmapname;
1510 }
1511 }
1512
1513 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1514 pthread_mutex_lock(&dso->lock);
1515
1516 /* check again under the dso->lock */
1517 if (dso__loaded(dso)) {
1518 ret = 1;
1519 goto out;
1520 }
1521
1522 if (map->groups && map->groups->machine)
1523 machine = map->groups->machine;
1524 else
1525 machine = NULL;
1526
1527 if (dso->kernel) {
1528 if (dso->kernel == DSO_TYPE_KERNEL)
1529 ret = dso__load_kernel_sym(dso, map);
1530 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1531 ret = dso__load_guest_kernel_sym(dso, map);
1532
1533 if (machine__is(machine, "x86_64"))
1534 machine__map_x86_64_entry_trampolines(machine, dso);
1535 goto out;
1536 }
1537
1538 dso->adjust_symbols = 0;
1539
1540 if (perfmap) {
1541 struct stat st;
1542
1543 if (lstat(map_path, &st) < 0)
1544 goto out;
1545
1546 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
1547 pr_warning("File %s not owned by current user or root, "
1548 "ignoring it (use -f to override).\n", map_path);
1549 goto out;
1550 }
1551
1552 ret = dso__load_perf_map(map_path, dso);
1553 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1554 DSO_BINARY_TYPE__NOT_FOUND;
1555 goto out;
1556 }
1557
1558 if (machine)
1559 root_dir = machine->root_dir;
1560
1561 name = malloc(PATH_MAX);
1562 if (!name)
1563 goto out;
1564
1565 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1566 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1567 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1568 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1569
1570
1571 /*
1572 * Read the build id if possible. This is required for
1573 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1574 */
1575 if (!dso->has_build_id &&
1576 is_regular_file(dso->long_name)) {
1577 __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1578 if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1579 dso__set_build_id(dso, build_id);
1580 }
1581
1582 /*
1583 * Iterate over candidate debug images.
1584 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1585 * and/or opd section) for processing.
1586 */
1587 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1588 struct symsrc *ss = &ss_[ss_pos];
1589 bool next_slot = false;
1590 bool is_reg;
1591 bool nsexit;
1592 int sirc = -1;
1593
1594 enum dso_binary_type symtab_type = binary_type_symtab[i];
1595
1596 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1597 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1598
1599 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1600 continue;
1601
1602 if (dso__read_binary_type_filename(dso, symtab_type,
1603 root_dir, name, PATH_MAX))
1604 continue;
1605
1606 if (nsexit)
1607 nsinfo__mountns_exit(&nsc);
1608
1609 is_reg = is_regular_file(name);
1610 if (is_reg)
1611 sirc = symsrc__init(ss, dso, name, symtab_type);
1612
1613 if (nsexit)
1614 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1615
1616 if (!is_reg || sirc < 0)
1617 continue;
1618
1619 if (!syms_ss && symsrc__has_symtab(ss)) {
1620 syms_ss = ss;
1621 next_slot = true;
1622 if (!dso->symsrc_filename)
1623 dso->symsrc_filename = strdup(name);
1624 }
1625
1626 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1627 runtime_ss = ss;
1628 next_slot = true;
1629 }
1630
1631 if (next_slot) {
1632 ss_pos++;
1633
1634 if (syms_ss && runtime_ss)
1635 break;
1636 } else {
1637 symsrc__destroy(ss);
1638 }
1639
1640 }
1641
1642 if (!runtime_ss && !syms_ss)
1643 goto out_free;
1644
1645 if (runtime_ss && !syms_ss) {
1646 syms_ss = runtime_ss;
1647 }
1648
1649 /* We'll have to hope for the best */
1650 if (!runtime_ss && syms_ss)
1651 runtime_ss = syms_ss;
1652
1653 if (syms_ss)
1654 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1655 else
1656 ret = -1;
1657
1658 if (ret > 0) {
1659 int nr_plt;
1660
1661 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1662 if (nr_plt > 0)
1663 ret += nr_plt;
1664 }
1665
1666 for (; ss_pos > 0; ss_pos--)
1667 symsrc__destroy(&ss_[ss_pos - 1]);
1668 out_free:
1669 free(name);
1670 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1671 ret = 0;
1672 out:
1673 dso__set_loaded(dso);
1674 pthread_mutex_unlock(&dso->lock);
1675 nsinfo__mountns_exit(&nsc);
1676
1677 return ret;
1678 }
1679
1680 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
1681 {
1682 struct maps *maps = &mg->maps;
1683 struct map *map;
1684
1685 down_read(&maps->lock);
1686
1687 for (map = maps__first(maps); map; map = map__next(map)) {
1688 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1689 goto out_unlock;
1690 }
1691
1692 map = NULL;
1693
1694 out_unlock:
1695 up_read(&maps->lock);
1696 return map;
1697 }
1698
1699 int dso__load_vmlinux(struct dso *dso, struct map *map,
1700 const char *vmlinux, bool vmlinux_allocated)
1701 {
1702 int err = -1;
1703 struct symsrc ss;
1704 char symfs_vmlinux[PATH_MAX];
1705 enum dso_binary_type symtab_type;
1706
1707 if (vmlinux[0] == '/')
1708 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1709 else
1710 symbol__join_symfs(symfs_vmlinux, vmlinux);
1711
1712 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1713 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1714 else
1715 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1716
1717 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1718 return -1;
1719
1720 err = dso__load_sym(dso, map, &ss, &ss, 0);
1721 symsrc__destroy(&ss);
1722
1723 if (err > 0) {
1724 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1725 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1726 else
1727 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1728 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1729 dso__set_loaded(dso);
1730 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1731 }
1732
1733 return err;
1734 }
1735
1736 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1737 {
1738 int i, err = 0;
1739 char *filename = NULL;
1740
1741 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1742 vmlinux_path__nr_entries + 1);
1743
1744 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1745 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1746 if (err > 0)
1747 goto out;
1748 }
1749
1750 if (!symbol_conf.ignore_vmlinux_buildid)
1751 filename = dso__build_id_filename(dso, NULL, 0, false);
1752 if (filename != NULL) {
1753 err = dso__load_vmlinux(dso, map, filename, true);
1754 if (err > 0)
1755 goto out;
1756 free(filename);
1757 }
1758 out:
1759 return err;
1760 }
1761
1762 static bool visible_dir_filter(const char *name, struct dirent *d)
1763 {
1764 if (d->d_type != DT_DIR)
1765 return false;
1766 return lsdir_no_dot_filter(name, d);
1767 }
1768
1769 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1770 {
1771 char kallsyms_filename[PATH_MAX];
1772 int ret = -1;
1773 struct strlist *dirs;
1774 struct str_node *nd;
1775
1776 dirs = lsdir(dir, visible_dir_filter);
1777 if (!dirs)
1778 return -1;
1779
1780 strlist__for_each_entry(nd, dirs) {
1781 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1782 "%s/%s/kallsyms", dir, nd->s);
1783 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1784 strlcpy(dir, kallsyms_filename, dir_sz);
1785 ret = 0;
1786 break;
1787 }
1788 }
1789
1790 strlist__delete(dirs);
1791
1792 return ret;
1793 }
1794
1795 /*
1796 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1797 * since access(R_OK) only checks with real UID/GID but open() use effective
1798 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1799 */
1800 static bool filename__readable(const char *file)
1801 {
1802 int fd = open(file, O_RDONLY);
1803 if (fd < 0)
1804 return false;
1805 close(fd);
1806 return true;
1807 }
1808
1809 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1810 {
1811 u8 host_build_id[BUILD_ID_SIZE];
1812 char sbuild_id[SBUILD_ID_SIZE];
1813 bool is_host = false;
1814 char path[PATH_MAX];
1815
1816 if (!dso->has_build_id) {
1817 /*
1818 * Last resort, if we don't have a build-id and couldn't find
1819 * any vmlinux file, try the running kernel kallsyms table.
1820 */
1821 goto proc_kallsyms;
1822 }
1823
1824 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1825 sizeof(host_build_id)) == 0)
1826 is_host = dso__build_id_equal(dso, host_build_id);
1827
1828 /* Try a fast path for /proc/kallsyms if possible */
1829 if (is_host) {
1830 /*
1831 * Do not check the build-id cache, unless we know we cannot use
1832 * /proc/kcore or module maps don't match to /proc/kallsyms.
1833 * To check readability of /proc/kcore, do not use access(R_OK)
1834 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1835 * can't check it.
1836 */
1837 if (filename__readable("/proc/kcore") &&
1838 !validate_kcore_addresses("/proc/kallsyms", map))
1839 goto proc_kallsyms;
1840 }
1841
1842 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1843
1844 /* Find kallsyms in build-id cache with kcore */
1845 scnprintf(path, sizeof(path), "%s/%s/%s",
1846 buildid_dir, DSO__NAME_KCORE, sbuild_id);
1847
1848 if (!find_matching_kcore(map, path, sizeof(path)))
1849 return strdup(path);
1850
1851 /* Use current /proc/kallsyms if possible */
1852 if (is_host) {
1853 proc_kallsyms:
1854 return strdup("/proc/kallsyms");
1855 }
1856
1857 /* Finally, find a cache of kallsyms */
1858 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1859 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1860 sbuild_id);
1861 return NULL;
1862 }
1863
1864 return strdup(path);
1865 }
1866
1867 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1868 {
1869 int err;
1870 const char *kallsyms_filename = NULL;
1871 char *kallsyms_allocated_filename = NULL;
1872 /*
1873 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1874 * it and only it, reporting errors to the user if it cannot be used.
1875 *
1876 * For instance, try to analyse an ARM perf.data file _without_ a
1877 * build-id, or if the user specifies the wrong path to the right
1878 * vmlinux file, obviously we can't fallback to another vmlinux (a
1879 * x86_86 one, on the machine where analysis is being performed, say),
1880 * or worse, /proc/kallsyms.
1881 *
1882 * If the specified file _has_ a build-id and there is a build-id
1883 * section in the perf.data file, we will still do the expected
1884 * validation in dso__load_vmlinux and will bail out if they don't
1885 * match.
1886 */
1887 if (symbol_conf.kallsyms_name != NULL) {
1888 kallsyms_filename = symbol_conf.kallsyms_name;
1889 goto do_kallsyms;
1890 }
1891
1892 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1893 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
1894 }
1895
1896 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1897 err = dso__load_vmlinux_path(dso, map);
1898 if (err > 0)
1899 return err;
1900 }
1901
1902 /* do not try local files if a symfs was given */
1903 if (symbol_conf.symfs[0] != 0)
1904 return -1;
1905
1906 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1907 if (!kallsyms_allocated_filename)
1908 return -1;
1909
1910 kallsyms_filename = kallsyms_allocated_filename;
1911
1912 do_kallsyms:
1913 err = dso__load_kallsyms(dso, kallsyms_filename, map);
1914 if (err > 0)
1915 pr_debug("Using %s for symbols\n", kallsyms_filename);
1916 free(kallsyms_allocated_filename);
1917
1918 if (err > 0 && !dso__is_kcore(dso)) {
1919 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1920 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
1921 map__fixup_start(map);
1922 map__fixup_end(map);
1923 }
1924
1925 return err;
1926 }
1927
1928 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
1929 {
1930 int err;
1931 const char *kallsyms_filename = NULL;
1932 struct machine *machine;
1933 char path[PATH_MAX];
1934
1935 if (!map->groups) {
1936 pr_debug("Guest kernel map hasn't the point to groups\n");
1937 return -1;
1938 }
1939 machine = map->groups->machine;
1940
1941 if (machine__is_default_guest(machine)) {
1942 /*
1943 * if the user specified a vmlinux filename, use it and only
1944 * it, reporting errors to the user if it cannot be used.
1945 * Or use file guest_kallsyms inputted by user on commandline
1946 */
1947 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1948 err = dso__load_vmlinux(dso, map,
1949 symbol_conf.default_guest_vmlinux_name,
1950 false);
1951 return err;
1952 }
1953
1954 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1955 if (!kallsyms_filename)
1956 return -1;
1957 } else {
1958 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1959 kallsyms_filename = path;
1960 }
1961
1962 err = dso__load_kallsyms(dso, kallsyms_filename, map);
1963 if (err > 0)
1964 pr_debug("Using %s for symbols\n", kallsyms_filename);
1965 if (err > 0 && !dso__is_kcore(dso)) {
1966 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1967 dso__set_long_name(dso, machine->mmap_name, false);
1968 map__fixup_start(map);
1969 map__fixup_end(map);
1970 }
1971
1972 return err;
1973 }
1974
1975 static void vmlinux_path__exit(void)
1976 {
1977 while (--vmlinux_path__nr_entries >= 0)
1978 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1979 vmlinux_path__nr_entries = 0;
1980
1981 zfree(&vmlinux_path);
1982 }
1983
1984 static const char * const vmlinux_paths[] = {
1985 "vmlinux",
1986 "/boot/vmlinux"
1987 };
1988
1989 static const char * const vmlinux_paths_upd[] = {
1990 "/boot/vmlinux-%s",
1991 "/usr/lib/debug/boot/vmlinux-%s",
1992 "/lib/modules/%s/build/vmlinux",
1993 "/usr/lib/debug/lib/modules/%s/vmlinux",
1994 "/usr/lib/debug/boot/vmlinux-%s.debug"
1995 };
1996
1997 static int vmlinux_path__add(const char *new_entry)
1998 {
1999 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2000 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2001 return -1;
2002 ++vmlinux_path__nr_entries;
2003
2004 return 0;
2005 }
2006
2007 static int vmlinux_path__init(struct perf_env *env)
2008 {
2009 struct utsname uts;
2010 char bf[PATH_MAX];
2011 char *kernel_version;
2012 unsigned int i;
2013
2014 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2015 ARRAY_SIZE(vmlinux_paths_upd)));
2016 if (vmlinux_path == NULL)
2017 return -1;
2018
2019 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2020 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2021 goto out_fail;
2022
2023 /* only try kernel version if no symfs was given */
2024 if (symbol_conf.symfs[0] != 0)
2025 return 0;
2026
2027 if (env) {
2028 kernel_version = env->os_release;
2029 } else {
2030 if (uname(&uts) < 0)
2031 goto out_fail;
2032
2033 kernel_version = uts.release;
2034 }
2035
2036 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2037 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2038 if (vmlinux_path__add(bf) < 0)
2039 goto out_fail;
2040 }
2041
2042 return 0;
2043
2044 out_fail:
2045 vmlinux_path__exit();
2046 return -1;
2047 }
2048
2049 int setup_list(struct strlist **list, const char *list_str,
2050 const char *list_name)
2051 {
2052 if (list_str == NULL)
2053 return 0;
2054
2055 *list = strlist__new(list_str, NULL);
2056 if (!*list) {
2057 pr_err("problems parsing %s list\n", list_name);
2058 return -1;
2059 }
2060
2061 symbol_conf.has_filter = true;
2062 return 0;
2063 }
2064
2065 int setup_intlist(struct intlist **list, const char *list_str,
2066 const char *list_name)
2067 {
2068 if (list_str == NULL)
2069 return 0;
2070
2071 *list = intlist__new(list_str);
2072 if (!*list) {
2073 pr_err("problems parsing %s list\n", list_name);
2074 return -1;
2075 }
2076 return 0;
2077 }
2078
2079 static bool symbol__read_kptr_restrict(void)
2080 {
2081 bool value = false;
2082 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2083
2084 if (fp != NULL) {
2085 char line[8];
2086
2087 if (fgets(line, sizeof(line), fp) != NULL)
2088 value = ((geteuid() != 0) || (getuid() != 0)) ?
2089 (atoi(line) != 0) :
2090 (atoi(line) == 2);
2091
2092 fclose(fp);
2093 }
2094
2095 return value;
2096 }
2097
2098 int symbol__annotation_init(void)
2099 {
2100 if (symbol_conf.init_annotation)
2101 return 0;
2102
2103 if (symbol_conf.initialized) {
2104 pr_err("Annotation needs to be init before symbol__init()\n");
2105 return -1;
2106 }
2107
2108 symbol_conf.priv_size += sizeof(struct annotation);
2109 symbol_conf.init_annotation = true;
2110 return 0;
2111 }
2112
2113 int symbol__init(struct perf_env *env)
2114 {
2115 const char *symfs;
2116
2117 if (symbol_conf.initialized)
2118 return 0;
2119
2120 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2121
2122 symbol__elf_init();
2123
2124 if (symbol_conf.sort_by_name)
2125 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2126 sizeof(struct symbol));
2127
2128 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2129 return -1;
2130
2131 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2132 pr_err("'.' is the only non valid --field-separator argument\n");
2133 return -1;
2134 }
2135
2136 if (setup_list(&symbol_conf.dso_list,
2137 symbol_conf.dso_list_str, "dso") < 0)
2138 return -1;
2139
2140 if (setup_list(&symbol_conf.comm_list,
2141 symbol_conf.comm_list_str, "comm") < 0)
2142 goto out_free_dso_list;
2143
2144 if (setup_intlist(&symbol_conf.pid_list,
2145 symbol_conf.pid_list_str, "pid") < 0)
2146 goto out_free_comm_list;
2147
2148 if (setup_intlist(&symbol_conf.tid_list,
2149 symbol_conf.tid_list_str, "tid") < 0)
2150 goto out_free_pid_list;
2151
2152 if (setup_list(&symbol_conf.sym_list,
2153 symbol_conf.sym_list_str, "symbol") < 0)
2154 goto out_free_tid_list;
2155
2156 if (setup_list(&symbol_conf.bt_stop_list,
2157 symbol_conf.bt_stop_list_str, "symbol") < 0)
2158 goto out_free_sym_list;
2159
2160 /*
2161 * A path to symbols of "/" is identical to ""
2162 * reset here for simplicity.
2163 */
2164 symfs = realpath(symbol_conf.symfs, NULL);
2165 if (symfs == NULL)
2166 symfs = symbol_conf.symfs;
2167 if (strcmp(symfs, "/") == 0)
2168 symbol_conf.symfs = "";
2169 if (symfs != symbol_conf.symfs)
2170 free((void *)symfs);
2171
2172 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2173
2174 symbol_conf.initialized = true;
2175 return 0;
2176
2177 out_free_sym_list:
2178 strlist__delete(symbol_conf.sym_list);
2179 out_free_tid_list:
2180 intlist__delete(symbol_conf.tid_list);
2181 out_free_pid_list:
2182 intlist__delete(symbol_conf.pid_list);
2183 out_free_comm_list:
2184 strlist__delete(symbol_conf.comm_list);
2185 out_free_dso_list:
2186 strlist__delete(symbol_conf.dso_list);
2187 return -1;
2188 }
2189
2190 void symbol__exit(void)
2191 {
2192 if (!symbol_conf.initialized)
2193 return;
2194 strlist__delete(symbol_conf.bt_stop_list);
2195 strlist__delete(symbol_conf.sym_list);
2196 strlist__delete(symbol_conf.dso_list);
2197 strlist__delete(symbol_conf.comm_list);
2198 intlist__delete(symbol_conf.tid_list);
2199 intlist__delete(symbol_conf.pid_list);
2200 vmlinux_path__exit();
2201 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2202 symbol_conf.bt_stop_list = NULL;
2203 symbol_conf.initialized = false;
2204 }
2205
2206 int symbol__config_symfs(const struct option *opt __maybe_unused,
2207 const char *dir, int unset __maybe_unused)
2208 {
2209 char *bf = NULL;
2210 int ret;
2211
2212 symbol_conf.symfs = strdup(dir);
2213 if (symbol_conf.symfs == NULL)
2214 return -ENOMEM;
2215
2216 /* skip the locally configured cache if a symfs is given, and
2217 * config buildid dir to symfs/.debug
2218 */
2219 ret = asprintf(&bf, "%s/%s", dir, ".debug");
2220 if (ret < 0)
2221 return -ENOMEM;
2222
2223 set_buildid_dir(bf);
2224
2225 free(bf);
2226 return 0;
2227 }
2228
2229 struct mem_info *mem_info__get(struct mem_info *mi)
2230 {
2231 if (mi)
2232 refcount_inc(&mi->refcnt);
2233 return mi;
2234 }
2235
2236 void mem_info__put(struct mem_info *mi)
2237 {
2238 if (mi && refcount_dec_and_test(&mi->refcnt))
2239 free(mi);
2240 }
2241
2242 struct mem_info *mem_info__new(void)
2243 {
2244 struct mem_info *mi = zalloc(sizeof(*mi));
2245
2246 if (mi)
2247 refcount_set(&mi->refcnt, 1);
2248 return mi;
2249 }
Linux with added FPC-III support