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Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / tools / perf / util / symbol.c
blobcc065d4bfafcff9704aecb96b8af462cf7182778
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 <sys/types.h>
9 #include <sys/stat.h>
10 #include <sys/param.h>
11 #include <fcntl.h>
12 #include <unistd.h>
13 #include <inttypes.h>
14 #include "annotate.h"
15 #include "build-id.h"
16 #include "util.h"
17 #include "debug.h"
18 #include "machine.h"
19 #include "symbol.h"
20 #include "strlist.h"
21 #include "intlist.h"
22 #include "namespaces.h"
23 #include "header.h"
24 #include "path.h"
25 #include "sane_ctype.h"
26
27 #include <elf.h>
28 #include <limits.h>
29 #include <symbol/kallsyms.h>
30 #include <sys/utsname.h>
31
32 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
33 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
34 static bool symbol__is_idle(const char *name);
35
36 int vmlinux_path__nr_entries;
37 char **vmlinux_path;
38
39 struct symbol_conf symbol_conf = {
40 .use_modules = true,
41 .try_vmlinux_path = true,
42 .annotate_src = true,
43 .demangle = true,
44 .demangle_kernel = false,
45 .cumulate_callchain = true,
46 .show_hist_headers = true,
47 .symfs = "",
48 .event_group = true,
49 .inline_name = true,
50 };
51
52 static enum dso_binary_type binary_type_symtab[] = {
53 DSO_BINARY_TYPE__KALLSYMS,
54 DSO_BINARY_TYPE__GUEST_KALLSYMS,
55 DSO_BINARY_TYPE__JAVA_JIT,
56 DSO_BINARY_TYPE__DEBUGLINK,
57 DSO_BINARY_TYPE__BUILD_ID_CACHE,
58 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
59 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
60 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
61 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
62 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
63 DSO_BINARY_TYPE__GUEST_KMODULE,
64 DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
65 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
66 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
67 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
68 DSO_BINARY_TYPE__NOT_FOUND,
69 };
70
71 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
72
73 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
74 {
75 symbol_type = toupper(symbol_type);
76
77 switch (map_type) {
78 case MAP__FUNCTION:
79 return symbol_type == 'T' || symbol_type == 'W';
80 case MAP__VARIABLE:
81 return symbol_type == 'D';
82 default:
83 return false;
84 }
85 }
86
87 static int prefix_underscores_count(const char *str)
88 {
89 const char *tail = str;
90
91 while (*tail == '_')
92 tail++;
93
94 return tail - str;
95 }
96
97 const char * __weak arch__normalize_symbol_name(const char *name)
98 {
99 return name;
100 }
101
102 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
103 {
104 return strcmp(namea, nameb);
105 }
106
107 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
108 unsigned int n)
109 {
110 return strncmp(namea, nameb, n);
111 }
112
113 int __weak arch__choose_best_symbol(struct symbol *syma,
114 struct symbol *symb __maybe_unused)
115 {
116 /* Avoid "SyS" kernel syscall aliases */
117 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
118 return SYMBOL_B;
119 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
120 return SYMBOL_B;
121
122 return SYMBOL_A;
123 }
124
125 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
126 {
127 s64 a;
128 s64 b;
129 size_t na, nb;
130
131 /* Prefer a symbol with non zero length */
132 a = syma->end - syma->start;
133 b = symb->end - symb->start;
134 if ((b == 0) && (a > 0))
135 return SYMBOL_A;
136 else if ((a == 0) && (b > 0))
137 return SYMBOL_B;
138
139 /* Prefer a non weak symbol over a weak one */
140 a = syma->binding == STB_WEAK;
141 b = symb->binding == STB_WEAK;
142 if (b && !a)
143 return SYMBOL_A;
144 if (a && !b)
145 return SYMBOL_B;
146
147 /* Prefer a global symbol over a non global one */
148 a = syma->binding == STB_GLOBAL;
149 b = symb->binding == STB_GLOBAL;
150 if (a && !b)
151 return SYMBOL_A;
152 if (b && !a)
153 return SYMBOL_B;
154
155 /* Prefer a symbol with less underscores */
156 a = prefix_underscores_count(syma->name);
157 b = prefix_underscores_count(symb->name);
158 if (b > a)
159 return SYMBOL_A;
160 else if (a > b)
161 return SYMBOL_B;
162
163 /* Choose the symbol with the longest name */
164 na = strlen(syma->name);
165 nb = strlen(symb->name);
166 if (na > nb)
167 return SYMBOL_A;
168 else if (na < nb)
169 return SYMBOL_B;
170
171 return arch__choose_best_symbol(syma, symb);
172 }
173
174 void symbols__fixup_duplicate(struct rb_root *symbols)
175 {
176 struct rb_node *nd;
177 struct symbol *curr, *next;
178
179 if (symbol_conf.allow_aliases)
180 return;
181
182 nd = rb_first(symbols);
183
184 while (nd) {
185 curr = rb_entry(nd, struct symbol, rb_node);
186 again:
187 nd = rb_next(&curr->rb_node);
188 next = rb_entry(nd, struct symbol, rb_node);
189
190 if (!nd)
191 break;
192
193 if (curr->start != next->start)
194 continue;
195
196 if (choose_best_symbol(curr, next) == SYMBOL_A) {
197 rb_erase(&next->rb_node, symbols);
198 symbol__delete(next);
199 goto again;
200 } else {
201 nd = rb_next(&curr->rb_node);
202 rb_erase(&curr->rb_node, symbols);
203 symbol__delete(curr);
204 }
205 }
206 }
207
208 void symbols__fixup_end(struct rb_root *symbols)
209 {
210 struct rb_node *nd, *prevnd = rb_first(symbols);
211 struct symbol *curr, *prev;
212
213 if (prevnd == NULL)
214 return;
215
216 curr = rb_entry(prevnd, struct symbol, rb_node);
217
218 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
219 prev = curr;
220 curr = rb_entry(nd, struct symbol, rb_node);
221
222 if (prev->end == prev->start && prev->end != curr->start)
223 prev->end = curr->start;
224 }
225
226 /* Last entry */
227 if (curr->end == curr->start)
228 curr->end = roundup(curr->start, 4096) + 4096;
229 }
230
231 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
232 {
233 struct maps *maps = &mg->maps[type];
234 struct map *next, *curr;
235
236 down_write(&maps->lock);
237
238 curr = maps__first(maps);
239 if (curr == NULL)
240 goto out_unlock;
241
242 for (next = map__next(curr); next; next = map__next(curr)) {
243 if (!curr->end)
244 curr->end = next->start;
245 curr = next;
246 }
247
248 /*
249 * We still haven't the actual symbols, so guess the
250 * last map final address.
251 */
252 if (!curr->end)
253 curr->end = ~0ULL;
254
255 out_unlock:
256 up_write(&maps->lock);
257 }
258
259 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
260 {
261 size_t namelen = strlen(name) + 1;
262 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
263 sizeof(*sym) + namelen));
264 if (sym == NULL)
265 return NULL;
266
267 if (symbol_conf.priv_size) {
268 if (symbol_conf.init_annotation) {
269 struct annotation *notes = (void *)sym;
270 pthread_mutex_init(&notes->lock, NULL);
271 }
272 sym = ((void *)sym) + symbol_conf.priv_size;
273 }
274
275 sym->start = start;
276 sym->end = len ? start + len : start;
277 sym->binding = binding;
278 sym->namelen = namelen - 1;
279
280 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
281 __func__, name, start, sym->end);
282 memcpy(sym->name, name, namelen);
283
284 return sym;
285 }
286
287 void symbol__delete(struct symbol *sym)
288 {
289 free(((void *)sym) - symbol_conf.priv_size);
290 }
291
292 void symbols__delete(struct rb_root *symbols)
293 {
294 struct symbol *pos;
295 struct rb_node *next = rb_first(symbols);
296
297 while (next) {
298 pos = rb_entry(next, struct symbol, rb_node);
299 next = rb_next(&pos->rb_node);
300 rb_erase(&pos->rb_node, symbols);
301 symbol__delete(pos);
302 }
303 }
304
305 void __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel)
306 {
307 struct rb_node **p = &symbols->rb_node;
308 struct rb_node *parent = NULL;
309 const u64 ip = sym->start;
310 struct symbol *s;
311
312 if (kernel) {
313 const char *name = sym->name;
314 /*
315 * ppc64 uses function descriptors and appends a '.' to the
316 * start of every instruction address. Remove it.
317 */
318 if (name[0] == '.')
319 name++;
320 sym->idle = symbol__is_idle(name);
321 }
322
323 while (*p != NULL) {
324 parent = *p;
325 s = rb_entry(parent, struct symbol, rb_node);
326 if (ip < s->start)
327 p = &(*p)->rb_left;
328 else
329 p = &(*p)->rb_right;
330 }
331 rb_link_node(&sym->rb_node, parent, p);
332 rb_insert_color(&sym->rb_node, symbols);
333 }
334
335 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
336 {
337 __symbols__insert(symbols, sym, false);
338 }
339
340 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
341 {
342 struct rb_node *n;
343
344 if (symbols == NULL)
345 return NULL;
346
347 n = symbols->rb_node;
348
349 while (n) {
350 struct symbol *s = rb_entry(n, struct symbol, rb_node);
351
352 if (ip < s->start)
353 n = n->rb_left;
354 else if (ip > s->end || (ip == s->end && ip != s->start))
355 n = n->rb_right;
356 else
357 return s;
358 }
359
360 return NULL;
361 }
362
363 static struct symbol *symbols__first(struct rb_root *symbols)
364 {
365 struct rb_node *n = rb_first(symbols);
366
367 if (n)
368 return rb_entry(n, struct symbol, rb_node);
369
370 return NULL;
371 }
372
373 static struct symbol *symbols__last(struct rb_root *symbols)
374 {
375 struct rb_node *n = rb_last(symbols);
376
377 if (n)
378 return rb_entry(n, struct symbol, rb_node);
379
380 return NULL;
381 }
382
383 static struct symbol *symbols__next(struct symbol *sym)
384 {
385 struct rb_node *n = rb_next(&sym->rb_node);
386
387 if (n)
388 return rb_entry(n, struct symbol, rb_node);
389
390 return NULL;
391 }
392
393 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
394 {
395 struct rb_node **p = &symbols->rb_node;
396 struct rb_node *parent = NULL;
397 struct symbol_name_rb_node *symn, *s;
398
399 symn = container_of(sym, struct symbol_name_rb_node, sym);
400
401 while (*p != NULL) {
402 parent = *p;
403 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
404 if (strcmp(sym->name, s->sym.name) < 0)
405 p = &(*p)->rb_left;
406 else
407 p = &(*p)->rb_right;
408 }
409 rb_link_node(&symn->rb_node, parent, p);
410 rb_insert_color(&symn->rb_node, symbols);
411 }
412
413 static void symbols__sort_by_name(struct rb_root *symbols,
414 struct rb_root *source)
415 {
416 struct rb_node *nd;
417
418 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
419 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
420 symbols__insert_by_name(symbols, pos);
421 }
422 }
423
424 int symbol__match_symbol_name(const char *name, const char *str,
425 enum symbol_tag_include includes)
426 {
427 const char *versioning;
428
429 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
430 (versioning = strstr(name, "@@"))) {
431 int len = strlen(str);
432
433 if (len < versioning - name)
434 len = versioning - name;
435
436 return arch__compare_symbol_names_n(name, str, len);
437 } else
438 return arch__compare_symbol_names(name, str);
439 }
440
441 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
442 const char *name,
443 enum symbol_tag_include includes)
444 {
445 struct rb_node *n;
446 struct symbol_name_rb_node *s = NULL;
447
448 if (symbols == NULL)
449 return NULL;
450
451 n = symbols->rb_node;
452
453 while (n) {
454 int cmp;
455
456 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
457 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
458
459 if (cmp > 0)
460 n = n->rb_left;
461 else if (cmp < 0)
462 n = n->rb_right;
463 else
464 break;
465 }
466
467 if (n == NULL)
468 return NULL;
469
470 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
471 /* return first symbol that has same name (if any) */
472 for (n = rb_prev(n); n; n = rb_prev(n)) {
473 struct symbol_name_rb_node *tmp;
474
475 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
476 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
477 break;
478
479 s = tmp;
480 }
481
482 return &s->sym;
483 }
484
485 void dso__reset_find_symbol_cache(struct dso *dso)
486 {
487 enum map_type type;
488
489 for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) {
490 dso->last_find_result[type].addr = 0;
491 dso->last_find_result[type].symbol = NULL;
492 }
493 }
494
495 void dso__insert_symbol(struct dso *dso, enum map_type type, struct symbol *sym)
496 {
497 __symbols__insert(&dso->symbols[type], sym, dso->kernel);
498
499 /* update the symbol cache if necessary */
500 if (dso->last_find_result[type].addr >= sym->start &&
501 (dso->last_find_result[type].addr < sym->end ||
502 sym->start == sym->end)) {
503 dso->last_find_result[type].symbol = sym;
504 }
505 }
506
507 struct symbol *dso__find_symbol(struct dso *dso,
508 enum map_type type, u64 addr)
509 {
510 if (dso->last_find_result[type].addr != addr || dso->last_find_result[type].symbol == NULL) {
511 dso->last_find_result[type].addr = addr;
512 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr);
513 }
514
515 return dso->last_find_result[type].symbol;
516 }
517
518 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
519 {
520 return symbols__first(&dso->symbols[type]);
521 }
522
523 struct symbol *dso__last_symbol(struct dso *dso, enum map_type type)
524 {
525 return symbols__last(&dso->symbols[type]);
526 }
527
528 struct symbol *dso__next_symbol(struct symbol *sym)
529 {
530 return symbols__next(sym);
531 }
532
533 struct symbol *symbol__next_by_name(struct symbol *sym)
534 {
535 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
536 struct rb_node *n = rb_next(&s->rb_node);
537
538 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
539 }
540
541 /*
542 * Teturns first symbol that matched with @name.
543 */
544 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
545 const char *name)
546 {
547 struct symbol *s = symbols__find_by_name(&dso->symbol_names[type], name,
548 SYMBOL_TAG_INCLUDE__NONE);
549 if (!s)
550 s = symbols__find_by_name(&dso->symbol_names[type], name,
551 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
552 return s;
553 }
554
555 void dso__sort_by_name(struct dso *dso, enum map_type type)
556 {
557 dso__set_sorted_by_name(dso, type);
558 return symbols__sort_by_name(&dso->symbol_names[type],
559 &dso->symbols[type]);
560 }
561
562 int modules__parse(const char *filename, void *arg,
563 int (*process_module)(void *arg, const char *name,
564 u64 start, u64 size))
565 {
566 char *line = NULL;
567 size_t n;
568 FILE *file;
569 int err = 0;
570
571 file = fopen(filename, "r");
572 if (file == NULL)
573 return -1;
574
575 while (1) {
576 char name[PATH_MAX];
577 u64 start, size;
578 char *sep, *endptr;
579 ssize_t line_len;
580
581 line_len = getline(&line, &n, file);
582 if (line_len < 0) {
583 if (feof(file))
584 break;
585 err = -1;
586 goto out;
587 }
588
589 if (!line) {
590 err = -1;
591 goto out;
592 }
593
594 line[--line_len] = '\0'; /* \n */
595
596 sep = strrchr(line, 'x');
597 if (sep == NULL)
598 continue;
599
600 hex2u64(sep + 1, &start);
601
602 sep = strchr(line, ' ');
603 if (sep == NULL)
604 continue;
605
606 *sep = '\0';
607
608 scnprintf(name, sizeof(name), "[%s]", line);
609
610 size = strtoul(sep + 1, &endptr, 0);
611 if (*endptr != ' ' && *endptr != '\t')
612 continue;
613
614 err = process_module(arg, name, start, size);
615 if (err)
616 break;
617 }
618 out:
619 free(line);
620 fclose(file);
621 return err;
622 }
623
624 struct process_kallsyms_args {
625 struct map *map;
626 struct dso *dso;
627 };
628
629 /*
630 * These are symbols in the kernel image, so make sure that
631 * sym is from a kernel DSO.
632 */
633 static bool symbol__is_idle(const char *name)
634 {
635 const char * const idle_symbols[] = {
636 "cpu_idle",
637 "cpu_startup_entry",
638 "intel_idle",
639 "default_idle",
640 "native_safe_halt",
641 "enter_idle",
642 "exit_idle",
643 "mwait_idle",
644 "mwait_idle_with_hints",
645 "poll_idle",
646 "ppc64_runlatch_off",
647 "pseries_dedicated_idle_sleep",
648 NULL
649 };
650 int i;
651
652 for (i = 0; idle_symbols[i]; i++) {
653 if (!strcmp(idle_symbols[i], name))
654 return true;
655 }
656
657 return false;
658 }
659
660 static int map__process_kallsym_symbol(void *arg, const char *name,
661 char type, u64 start)
662 {
663 struct symbol *sym;
664 struct process_kallsyms_args *a = arg;
665 struct rb_root *root = &a->dso->symbols[a->map->type];
666
667 if (!symbol_type__is_a(type, a->map->type))
668 return 0;
669
670 /*
671 * module symbols are not sorted so we add all
672 * symbols, setting length to 0, and rely on
673 * symbols__fixup_end() to fix it up.
674 */
675 sym = symbol__new(start, 0, kallsyms2elf_binding(type), name);
676 if (sym == NULL)
677 return -ENOMEM;
678 /*
679 * We will pass the symbols to the filter later, in
680 * map__split_kallsyms, when we have split the maps per module
681 */
682 __symbols__insert(root, sym, !strchr(name, '['));
683
684 return 0;
685 }
686
687 /*
688 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
689 * so that we can in the next step set the symbol ->end address and then
690 * call kernel_maps__split_kallsyms.
691 */
692 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
693 struct map *map)
694 {
695 struct process_kallsyms_args args = { .map = map, .dso = dso, };
696 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
697 }
698
699 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map)
700 {
701 struct map_groups *kmaps = map__kmaps(map);
702 struct map *curr_map;
703 struct symbol *pos;
704 int count = 0;
705 struct rb_root old_root = dso->symbols[map->type];
706 struct rb_root *root = &dso->symbols[map->type];
707 struct rb_node *next = rb_first(root);
708
709 if (!kmaps)
710 return -1;
711
712 *root = RB_ROOT;
713
714 while (next) {
715 char *module;
716
717 pos = rb_entry(next, struct symbol, rb_node);
718 next = rb_next(&pos->rb_node);
719
720 rb_erase_init(&pos->rb_node, &old_root);
721
722 module = strchr(pos->name, '\t');
723 if (module)
724 *module = '\0';
725
726 curr_map = map_groups__find(kmaps, map->type, pos->start);
727
728 if (!curr_map) {
729 symbol__delete(pos);
730 continue;
731 }
732
733 pos->start -= curr_map->start - curr_map->pgoff;
734 if (pos->end)
735 pos->end -= curr_map->start - curr_map->pgoff;
736 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
737 ++count;
738 }
739
740 /* Symbols have been adjusted */
741 dso->adjust_symbols = 1;
742
743 return count;
744 }
745
746 /*
747 * Split the symbols into maps, making sure there are no overlaps, i.e. the
748 * kernel range is broken in several maps, named [kernel].N, as we don't have
749 * the original ELF section names vmlinux have.
750 */
751 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta)
752 {
753 struct map_groups *kmaps = map__kmaps(map);
754 struct machine *machine;
755 struct map *curr_map = map;
756 struct symbol *pos;
757 int count = 0, moved = 0;
758 struct rb_root *root = &dso->symbols[map->type];
759 struct rb_node *next = rb_first(root);
760 int kernel_range = 0;
761
762 if (!kmaps)
763 return -1;
764
765 machine = kmaps->machine;
766
767 while (next) {
768 char *module;
769
770 pos = rb_entry(next, struct symbol, rb_node);
771 next = rb_next(&pos->rb_node);
772
773 module = strchr(pos->name, '\t');
774 if (module) {
775 if (!symbol_conf.use_modules)
776 goto discard_symbol;
777
778 *module++ = '\0';
779
780 if (strcmp(curr_map->dso->short_name, module)) {
781 if (curr_map != map &&
782 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
783 machine__is_default_guest(machine)) {
784 /*
785 * We assume all symbols of a module are
786 * continuous in * kallsyms, so curr_map
787 * points to a module and all its
788 * symbols are in its kmap. Mark it as
789 * loaded.
790 */
791 dso__set_loaded(curr_map->dso,
792 curr_map->type);
793 }
794
795 curr_map = map_groups__find_by_name(kmaps,
796 map->type, module);
797 if (curr_map == NULL) {
798 pr_debug("%s/proc/{kallsyms,modules} "
799 "inconsistency while looking "
800 "for \"%s\" module!\n",
801 machine->root_dir, module);
802 curr_map = map;
803 goto discard_symbol;
804 }
805
806 if (curr_map->dso->loaded &&
807 !machine__is_default_guest(machine))
808 goto discard_symbol;
809 }
810 /*
811 * So that we look just like we get from .ko files,
812 * i.e. not prelinked, relative to map->start.
813 */
814 pos->start = curr_map->map_ip(curr_map, pos->start);
815 pos->end = curr_map->map_ip(curr_map, pos->end);
816 } else if (curr_map != map) {
817 char dso_name[PATH_MAX];
818 struct dso *ndso;
819
820 if (delta) {
821 /* Kernel was relocated at boot time */
822 pos->start -= delta;
823 pos->end -= delta;
824 }
825
826 if (count == 0) {
827 curr_map = map;
828 goto add_symbol;
829 }
830
831 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
832 snprintf(dso_name, sizeof(dso_name),
833 "[guest.kernel].%d",
834 kernel_range++);
835 else
836 snprintf(dso_name, sizeof(dso_name),
837 "[kernel].%d",
838 kernel_range++);
839
840 ndso = dso__new(dso_name);
841 if (ndso == NULL)
842 return -1;
843
844 ndso->kernel = dso->kernel;
845
846 curr_map = map__new2(pos->start, ndso, map->type);
847 if (curr_map == NULL) {
848 dso__put(ndso);
849 return -1;
850 }
851
852 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
853 map_groups__insert(kmaps, curr_map);
854 ++kernel_range;
855 } else if (delta) {
856 /* Kernel was relocated at boot time */
857 pos->start -= delta;
858 pos->end -= delta;
859 }
860 add_symbol:
861 if (curr_map != map) {
862 rb_erase(&pos->rb_node, root);
863 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
864 ++moved;
865 } else
866 ++count;
867
868 continue;
869 discard_symbol:
870 rb_erase(&pos->rb_node, root);
871 symbol__delete(pos);
872 }
873
874 if (curr_map != map &&
875 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
876 machine__is_default_guest(kmaps->machine)) {
877 dso__set_loaded(curr_map->dso, curr_map->type);
878 }
879
880 return count + moved;
881 }
882
883 bool symbol__restricted_filename(const char *filename,
884 const char *restricted_filename)
885 {
886 bool restricted = false;
887
888 if (symbol_conf.kptr_restrict) {
889 char *r = realpath(filename, NULL);
890
891 if (r != NULL) {
892 restricted = strcmp(r, restricted_filename) == 0;
893 free(r);
894 return restricted;
895 }
896 }
897
898 return restricted;
899 }
900
901 struct module_info {
902 struct rb_node rb_node;
903 char *name;
904 u64 start;
905 };
906
907 static void add_module(struct module_info *mi, struct rb_root *modules)
908 {
909 struct rb_node **p = &modules->rb_node;
910 struct rb_node *parent = NULL;
911 struct module_info *m;
912
913 while (*p != NULL) {
914 parent = *p;
915 m = rb_entry(parent, struct module_info, rb_node);
916 if (strcmp(mi->name, m->name) < 0)
917 p = &(*p)->rb_left;
918 else
919 p = &(*p)->rb_right;
920 }
921 rb_link_node(&mi->rb_node, parent, p);
922 rb_insert_color(&mi->rb_node, modules);
923 }
924
925 static void delete_modules(struct rb_root *modules)
926 {
927 struct module_info *mi;
928 struct rb_node *next = rb_first(modules);
929
930 while (next) {
931 mi = rb_entry(next, struct module_info, rb_node);
932 next = rb_next(&mi->rb_node);
933 rb_erase(&mi->rb_node, modules);
934 zfree(&mi->name);
935 free(mi);
936 }
937 }
938
939 static struct module_info *find_module(const char *name,
940 struct rb_root *modules)
941 {
942 struct rb_node *n = modules->rb_node;
943
944 while (n) {
945 struct module_info *m;
946 int cmp;
947
948 m = rb_entry(n, struct module_info, rb_node);
949 cmp = strcmp(name, m->name);
950 if (cmp < 0)
951 n = n->rb_left;
952 else if (cmp > 0)
953 n = n->rb_right;
954 else
955 return m;
956 }
957
958 return NULL;
959 }
960
961 static int __read_proc_modules(void *arg, const char *name, u64 start,
962 u64 size __maybe_unused)
963 {
964 struct rb_root *modules = arg;
965 struct module_info *mi;
966
967 mi = zalloc(sizeof(struct module_info));
968 if (!mi)
969 return -ENOMEM;
970
971 mi->name = strdup(name);
972 mi->start = start;
973
974 if (!mi->name) {
975 free(mi);
976 return -ENOMEM;
977 }
978
979 add_module(mi, modules);
980
981 return 0;
982 }
983
984 static int read_proc_modules(const char *filename, struct rb_root *modules)
985 {
986 if (symbol__restricted_filename(filename, "/proc/modules"))
987 return -1;
988
989 if (modules__parse(filename, modules, __read_proc_modules)) {
990 delete_modules(modules);
991 return -1;
992 }
993
994 return 0;
995 }
996
997 int compare_proc_modules(const char *from, const char *to)
998 {
999 struct rb_root from_modules = RB_ROOT;
1000 struct rb_root to_modules = RB_ROOT;
1001 struct rb_node *from_node, *to_node;
1002 struct module_info *from_m, *to_m;
1003 int ret = -1;
1004
1005 if (read_proc_modules(from, &from_modules))
1006 return -1;
1007
1008 if (read_proc_modules(to, &to_modules))
1009 goto out_delete_from;
1010
1011 from_node = rb_first(&from_modules);
1012 to_node = rb_first(&to_modules);
1013 while (from_node) {
1014 if (!to_node)
1015 break;
1016
1017 from_m = rb_entry(from_node, struct module_info, rb_node);
1018 to_m = rb_entry(to_node, struct module_info, rb_node);
1019
1020 if (from_m->start != to_m->start ||
1021 strcmp(from_m->name, to_m->name))
1022 break;
1023
1024 from_node = rb_next(from_node);
1025 to_node = rb_next(to_node);
1026 }
1027
1028 if (!from_node && !to_node)
1029 ret = 0;
1030
1031 delete_modules(&to_modules);
1032 out_delete_from:
1033 delete_modules(&from_modules);
1034
1035 return ret;
1036 }
1037
1038 static int do_validate_kcore_modules(const char *filename, struct map *map,
1039 struct map_groups *kmaps)
1040 {
1041 struct rb_root modules = RB_ROOT;
1042 struct map *old_map;
1043 int err;
1044
1045 err = read_proc_modules(filename, &modules);
1046 if (err)
1047 return err;
1048
1049 old_map = map_groups__first(kmaps, map->type);
1050 while (old_map) {
1051 struct map *next = map_groups__next(old_map);
1052 struct module_info *mi;
1053
1054 if (old_map == map || old_map->start == map->start) {
1055 /* The kernel map */
1056 old_map = next;
1057 continue;
1058 }
1059
1060 /* Module must be in memory at the same address */
1061 mi = find_module(old_map->dso->short_name, &modules);
1062 if (!mi || mi->start != old_map->start) {
1063 err = -EINVAL;
1064 goto out;
1065 }
1066
1067 old_map = next;
1068 }
1069 out:
1070 delete_modules(&modules);
1071 return err;
1072 }
1073
1074 /*
1075 * If kallsyms is referenced by name then we look for filename in the same
1076 * directory.
1077 */
1078 static bool filename_from_kallsyms_filename(char *filename,
1079 const char *base_name,
1080 const char *kallsyms_filename)
1081 {
1082 char *name;
1083
1084 strcpy(filename, kallsyms_filename);
1085 name = strrchr(filename, '/');
1086 if (!name)
1087 return false;
1088
1089 name += 1;
1090
1091 if (!strcmp(name, "kallsyms")) {
1092 strcpy(name, base_name);
1093 return true;
1094 }
1095
1096 return false;
1097 }
1098
1099 static int validate_kcore_modules(const char *kallsyms_filename,
1100 struct map *map)
1101 {
1102 struct map_groups *kmaps = map__kmaps(map);
1103 char modules_filename[PATH_MAX];
1104
1105 if (!kmaps)
1106 return -EINVAL;
1107
1108 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1109 kallsyms_filename))
1110 return -EINVAL;
1111
1112 if (do_validate_kcore_modules(modules_filename, map, kmaps))
1113 return -EINVAL;
1114
1115 return 0;
1116 }
1117
1118 static int validate_kcore_addresses(const char *kallsyms_filename,
1119 struct map *map)
1120 {
1121 struct kmap *kmap = map__kmap(map);
1122
1123 if (!kmap)
1124 return -EINVAL;
1125
1126 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1127 u64 start;
1128
1129 if (kallsyms__get_function_start(kallsyms_filename,
1130 kmap->ref_reloc_sym->name, &start))
1131 return -ENOENT;
1132 if (start != kmap->ref_reloc_sym->addr)
1133 return -EINVAL;
1134 }
1135
1136 return validate_kcore_modules(kallsyms_filename, map);
1137 }
1138
1139 struct kcore_mapfn_data {
1140 struct dso *dso;
1141 enum map_type type;
1142 struct list_head maps;
1143 };
1144
1145 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1146 {
1147 struct kcore_mapfn_data *md = data;
1148 struct map *map;
1149
1150 map = map__new2(start, md->dso, md->type);
1151 if (map == NULL)
1152 return -ENOMEM;
1153
1154 map->end = map->start + len;
1155 map->pgoff = pgoff;
1156
1157 list_add(&map->node, &md->maps);
1158
1159 return 0;
1160 }
1161
1162 static int dso__load_kcore(struct dso *dso, struct map *map,
1163 const char *kallsyms_filename)
1164 {
1165 struct map_groups *kmaps = map__kmaps(map);
1166 struct machine *machine;
1167 struct kcore_mapfn_data md;
1168 struct map *old_map, *new_map, *replacement_map = NULL;
1169 bool is_64_bit;
1170 int err, fd;
1171 char kcore_filename[PATH_MAX];
1172 struct symbol *sym;
1173
1174 if (!kmaps)
1175 return -EINVAL;
1176
1177 machine = kmaps->machine;
1178
1179 /* This function requires that the map is the kernel map */
1180 if (map != machine->vmlinux_maps[map->type])
1181 return -EINVAL;
1182
1183 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1184 kallsyms_filename))
1185 return -EINVAL;
1186
1187 /* Modules and kernel must be present at their original addresses */
1188 if (validate_kcore_addresses(kallsyms_filename, map))
1189 return -EINVAL;
1190
1191 md.dso = dso;
1192 md.type = map->type;
1193 INIT_LIST_HEAD(&md.maps);
1194
1195 fd = open(kcore_filename, O_RDONLY);
1196 if (fd < 0) {
1197 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1198 kcore_filename);
1199 return -EINVAL;
1200 }
1201
1202 /* Read new maps into temporary lists */
1203 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1204 &is_64_bit);
1205 if (err)
1206 goto out_err;
1207 dso->is_64_bit = is_64_bit;
1208
1209 if (list_empty(&md.maps)) {
1210 err = -EINVAL;
1211 goto out_err;
1212 }
1213
1214 /* Remove old maps */
1215 old_map = map_groups__first(kmaps, map->type);
1216 while (old_map) {
1217 struct map *next = map_groups__next(old_map);
1218
1219 if (old_map != map)
1220 map_groups__remove(kmaps, old_map);
1221 old_map = next;
1222 }
1223
1224 /* Find the kernel map using the first symbol */
1225 sym = dso__first_symbol(dso, map->type);
1226 list_for_each_entry(new_map, &md.maps, node) {
1227 if (sym && sym->start >= new_map->start &&
1228 sym->start < new_map->end) {
1229 replacement_map = new_map;
1230 break;
1231 }
1232 }
1233
1234 if (!replacement_map)
1235 replacement_map = list_entry(md.maps.next, struct map, node);
1236
1237 /* Add new maps */
1238 while (!list_empty(&md.maps)) {
1239 new_map = list_entry(md.maps.next, struct map, node);
1240 list_del_init(&new_map->node);
1241 if (new_map == replacement_map) {
1242 map->start = new_map->start;
1243 map->end = new_map->end;
1244 map->pgoff = new_map->pgoff;
1245 map->map_ip = new_map->map_ip;
1246 map->unmap_ip = new_map->unmap_ip;
1247 /* Ensure maps are correctly ordered */
1248 map__get(map);
1249 map_groups__remove(kmaps, map);
1250 map_groups__insert(kmaps, map);
1251 map__put(map);
1252 } else {
1253 map_groups__insert(kmaps, new_map);
1254 }
1255
1256 map__put(new_map);
1257 }
1258
1259 /*
1260 * Set the data type and long name so that kcore can be read via
1261 * dso__data_read_addr().
1262 */
1263 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1264 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1265 else
1266 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1267 dso__set_long_name(dso, strdup(kcore_filename), true);
1268
1269 close(fd);
1270
1271 if (map->type == MAP__FUNCTION)
1272 pr_debug("Using %s for kernel object code\n", kcore_filename);
1273 else
1274 pr_debug("Using %s for kernel data\n", kcore_filename);
1275
1276 return 0;
1277
1278 out_err:
1279 while (!list_empty(&md.maps)) {
1280 map = list_entry(md.maps.next, struct map, node);
1281 list_del_init(&map->node);
1282 map__put(map);
1283 }
1284 close(fd);
1285 return -EINVAL;
1286 }
1287
1288 /*
1289 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1290 * delta based on the relocation reference symbol.
1291 */
1292 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1293 {
1294 struct kmap *kmap = map__kmap(map);
1295 u64 addr;
1296
1297 if (!kmap)
1298 return -1;
1299
1300 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1301 return 0;
1302
1303 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1304 return -1;
1305
1306 *delta = addr - kmap->ref_reloc_sym->addr;
1307 return 0;
1308 }
1309
1310 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1311 struct map *map, bool no_kcore)
1312 {
1313 u64 delta = 0;
1314
1315 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1316 return -1;
1317
1318 if (dso__load_all_kallsyms(dso, filename, map) < 0)
1319 return -1;
1320
1321 if (kallsyms__delta(map, filename, &delta))
1322 return -1;
1323
1324 symbols__fixup_end(&dso->symbols[map->type]);
1325 symbols__fixup_duplicate(&dso->symbols[map->type]);
1326
1327 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1328 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1329 else
1330 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1331
1332 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1333 return dso__split_kallsyms_for_kcore(dso, map);
1334 else
1335 return dso__split_kallsyms(dso, map, delta);
1336 }
1337
1338 int dso__load_kallsyms(struct dso *dso, const char *filename,
1339 struct map *map)
1340 {
1341 return __dso__load_kallsyms(dso, filename, map, false);
1342 }
1343
1344 static int dso__load_perf_map(const char *map_path, struct dso *dso,
1345 struct map *map)
1346 {
1347 char *line = NULL;
1348 size_t n;
1349 FILE *file;
1350 int nr_syms = 0;
1351
1352 file = fopen(map_path, "r");
1353 if (file == NULL)
1354 goto out_failure;
1355
1356 while (!feof(file)) {
1357 u64 start, size;
1358 struct symbol *sym;
1359 int line_len, len;
1360
1361 line_len = getline(&line, &n, file);
1362 if (line_len < 0)
1363 break;
1364
1365 if (!line)
1366 goto out_failure;
1367
1368 line[--line_len] = '\0'; /* \n */
1369
1370 len = hex2u64(line, &start);
1371
1372 len++;
1373 if (len + 2 >= line_len)
1374 continue;
1375
1376 len += hex2u64(line + len, &size);
1377
1378 len++;
1379 if (len + 2 >= line_len)
1380 continue;
1381
1382 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1383
1384 if (sym == NULL)
1385 goto out_delete_line;
1386
1387 symbols__insert(&dso->symbols[map->type], sym);
1388 nr_syms++;
1389 }
1390
1391 free(line);
1392 fclose(file);
1393
1394 return nr_syms;
1395
1396 out_delete_line:
1397 free(line);
1398 out_failure:
1399 return -1;
1400 }
1401
1402 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1403 enum dso_binary_type type)
1404 {
1405 switch (type) {
1406 case DSO_BINARY_TYPE__JAVA_JIT:
1407 case DSO_BINARY_TYPE__DEBUGLINK:
1408 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1409 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1410 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1411 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1412 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1413 return !kmod && dso->kernel == DSO_TYPE_USER;
1414
1415 case DSO_BINARY_TYPE__KALLSYMS:
1416 case DSO_BINARY_TYPE__VMLINUX:
1417 case DSO_BINARY_TYPE__KCORE:
1418 return dso->kernel == DSO_TYPE_KERNEL;
1419
1420 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1421 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1422 case DSO_BINARY_TYPE__GUEST_KCORE:
1423 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1424
1425 case DSO_BINARY_TYPE__GUEST_KMODULE:
1426 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1427 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1428 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1429 /*
1430 * kernel modules know their symtab type - it's set when
1431 * creating a module dso in machine__findnew_module_map().
1432 */
1433 return kmod && dso->symtab_type == type;
1434
1435 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1436 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1437 return true;
1438
1439 case DSO_BINARY_TYPE__NOT_FOUND:
1440 default:
1441 return false;
1442 }
1443 }
1444
1445 /* Checks for the existence of the perf-<pid>.map file in two different
1446 * locations. First, if the process is a separate mount namespace, check in
1447 * that namespace using the pid of the innermost pid namespace. If's not in a
1448 * namespace, or the file can't be found there, try in the mount namespace of
1449 * the tracing process using our view of its pid.
1450 */
1451 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1452 struct nsinfo **nsip)
1453 {
1454 struct nscookie nsc;
1455 struct nsinfo *nsi;
1456 struct nsinfo *nnsi;
1457 int rc = -1;
1458
1459 nsi = *nsip;
1460
1461 if (nsi->need_setns) {
1462 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1463 nsinfo__mountns_enter(nsi, &nsc);
1464 rc = access(filebuf, R_OK);
1465 nsinfo__mountns_exit(&nsc);
1466 if (rc == 0)
1467 return rc;
1468 }
1469
1470 nnsi = nsinfo__copy(nsi);
1471 if (nnsi) {
1472 nsinfo__put(nsi);
1473
1474 nnsi->need_setns = false;
1475 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1476 *nsip = nnsi;
1477 rc = 0;
1478 }
1479
1480 return rc;
1481 }
1482
1483 int dso__load(struct dso *dso, struct map *map)
1484 {
1485 char *name;
1486 int ret = -1;
1487 u_int i;
1488 struct machine *machine;
1489 char *root_dir = (char *) "";
1490 int ss_pos = 0;
1491 struct symsrc ss_[2];
1492 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1493 bool kmod;
1494 bool perfmap;
1495 unsigned char build_id[BUILD_ID_SIZE];
1496 struct nscookie nsc;
1497 char newmapname[PATH_MAX];
1498 const char *map_path = dso->long_name;
1499
1500 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1501 if (perfmap) {
1502 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1503 sizeof(newmapname), &dso->nsinfo) == 0)) {
1504 map_path = newmapname;
1505 }
1506 }
1507
1508 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1509 pthread_mutex_lock(&dso->lock);
1510
1511 /* check again under the dso->lock */
1512 if (dso__loaded(dso, map->type)) {
1513 ret = 1;
1514 goto out;
1515 }
1516
1517 if (dso->kernel) {
1518 if (dso->kernel == DSO_TYPE_KERNEL)
1519 ret = dso__load_kernel_sym(dso, map);
1520 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1521 ret = dso__load_guest_kernel_sym(dso, map);
1522
1523 goto out;
1524 }
1525
1526 if (map->groups && map->groups->machine)
1527 machine = map->groups->machine;
1528 else
1529 machine = NULL;
1530
1531 dso->adjust_symbols = 0;
1532
1533 if (perfmap) {
1534 struct stat st;
1535
1536 if (lstat(map_path, &st) < 0)
1537 goto out;
1538
1539 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
1540 pr_warning("File %s not owned by current user or root, "
1541 "ignoring it (use -f to override).\n", map_path);
1542 goto out;
1543 }
1544
1545 ret = dso__load_perf_map(map_path, dso, map);
1546 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1547 DSO_BINARY_TYPE__NOT_FOUND;
1548 goto out;
1549 }
1550
1551 if (machine)
1552 root_dir = machine->root_dir;
1553
1554 name = malloc(PATH_MAX);
1555 if (!name)
1556 goto out;
1557
1558 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1559 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1560 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1561 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1562
1563
1564 /*
1565 * Read the build id if possible. This is required for
1566 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1567 */
1568 if (!dso->has_build_id &&
1569 is_regular_file(dso->long_name)) {
1570 __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1571 if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1572 dso__set_build_id(dso, build_id);
1573 }
1574
1575 /*
1576 * Iterate over candidate debug images.
1577 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1578 * and/or opd section) for processing.
1579 */
1580 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1581 struct symsrc *ss = &ss_[ss_pos];
1582 bool next_slot = false;
1583 bool is_reg;
1584 bool nsexit;
1585 int sirc;
1586
1587 enum dso_binary_type symtab_type = binary_type_symtab[i];
1588
1589 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1590 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1591
1592 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1593 continue;
1594
1595 if (dso__read_binary_type_filename(dso, symtab_type,
1596 root_dir, name, PATH_MAX))
1597 continue;
1598
1599 if (nsexit)
1600 nsinfo__mountns_exit(&nsc);
1601
1602 is_reg = is_regular_file(name);
1603 sirc = symsrc__init(ss, dso, name, symtab_type);
1604
1605 if (nsexit)
1606 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1607
1608 if (!is_reg || sirc < 0) {
1609 if (sirc >= 0)
1610 symsrc__destroy(ss);
1611 continue;
1612 }
1613
1614 if (!syms_ss && symsrc__has_symtab(ss)) {
1615 syms_ss = ss;
1616 next_slot = true;
1617 if (!dso->symsrc_filename)
1618 dso->symsrc_filename = strdup(name);
1619 }
1620
1621 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1622 runtime_ss = ss;
1623 next_slot = true;
1624 }
1625
1626 if (next_slot) {
1627 ss_pos++;
1628
1629 if (syms_ss && runtime_ss)
1630 break;
1631 } else {
1632 symsrc__destroy(ss);
1633 }
1634
1635 }
1636
1637 if (!runtime_ss && !syms_ss)
1638 goto out_free;
1639
1640 if (runtime_ss && !syms_ss) {
1641 syms_ss = runtime_ss;
1642 }
1643
1644 /* We'll have to hope for the best */
1645 if (!runtime_ss && syms_ss)
1646 runtime_ss = syms_ss;
1647
1648 if (syms_ss)
1649 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1650 else
1651 ret = -1;
1652
1653 if (ret > 0) {
1654 int nr_plt;
1655
1656 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map);
1657 if (nr_plt > 0)
1658 ret += nr_plt;
1659 }
1660
1661 for (; ss_pos > 0; ss_pos--)
1662 symsrc__destroy(&ss_[ss_pos - 1]);
1663 out_free:
1664 free(name);
1665 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1666 ret = 0;
1667 out:
1668 dso__set_loaded(dso, map->type);
1669 pthread_mutex_unlock(&dso->lock);
1670 nsinfo__mountns_exit(&nsc);
1671
1672 return ret;
1673 }
1674
1675 struct map *map_groups__find_by_name(struct map_groups *mg,
1676 enum map_type type, const char *name)
1677 {
1678 struct maps *maps = &mg->maps[type];
1679 struct map *map;
1680
1681 down_read(&maps->lock);
1682
1683 for (map = maps__first(maps); map; map = map__next(map)) {
1684 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1685 goto out_unlock;
1686 }
1687
1688 map = NULL;
1689
1690 out_unlock:
1691 up_read(&maps->lock);
1692 return map;
1693 }
1694
1695 int dso__load_vmlinux(struct dso *dso, struct map *map,
1696 const char *vmlinux, bool vmlinux_allocated)
1697 {
1698 int err = -1;
1699 struct symsrc ss;
1700 char symfs_vmlinux[PATH_MAX];
1701 enum dso_binary_type symtab_type;
1702
1703 if (vmlinux[0] == '/')
1704 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1705 else
1706 symbol__join_symfs(symfs_vmlinux, vmlinux);
1707
1708 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1709 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1710 else
1711 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1712
1713 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1714 return -1;
1715
1716 err = dso__load_sym(dso, map, &ss, &ss, 0);
1717 symsrc__destroy(&ss);
1718
1719 if (err > 0) {
1720 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1721 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1722 else
1723 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1724 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1725 dso__set_loaded(dso, map->type);
1726 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1727 }
1728
1729 return err;
1730 }
1731
1732 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1733 {
1734 int i, err = 0;
1735 char *filename = NULL;
1736
1737 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1738 vmlinux_path__nr_entries + 1);
1739
1740 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1741 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1742 if (err > 0)
1743 goto out;
1744 }
1745
1746 if (!symbol_conf.ignore_vmlinux_buildid)
1747 filename = dso__build_id_filename(dso, NULL, 0, false);
1748 if (filename != NULL) {
1749 err = dso__load_vmlinux(dso, map, filename, true);
1750 if (err > 0)
1751 goto out;
1752 free(filename);
1753 }
1754 out:
1755 return err;
1756 }
1757
1758 static bool visible_dir_filter(const char *name, struct dirent *d)
1759 {
1760 if (d->d_type != DT_DIR)
1761 return false;
1762 return lsdir_no_dot_filter(name, d);
1763 }
1764
1765 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1766 {
1767 char kallsyms_filename[PATH_MAX];
1768 int ret = -1;
1769 struct strlist *dirs;
1770 struct str_node *nd;
1771
1772 dirs = lsdir(dir, visible_dir_filter);
1773 if (!dirs)
1774 return -1;
1775
1776 strlist__for_each_entry(nd, dirs) {
1777 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1778 "%s/%s/kallsyms", dir, nd->s);
1779 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1780 strlcpy(dir, kallsyms_filename, dir_sz);
1781 ret = 0;
1782 break;
1783 }
1784 }
1785
1786 strlist__delete(dirs);
1787
1788 return ret;
1789 }
1790
1791 /*
1792 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1793 * since access(R_OK) only checks with real UID/GID but open() use effective
1794 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1795 */
1796 static bool filename__readable(const char *file)
1797 {
1798 int fd = open(file, O_RDONLY);
1799 if (fd < 0)
1800 return false;
1801 close(fd);
1802 return true;
1803 }
1804
1805 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1806 {
1807 u8 host_build_id[BUILD_ID_SIZE];
1808 char sbuild_id[SBUILD_ID_SIZE];
1809 bool is_host = false;
1810 char path[PATH_MAX];
1811
1812 if (!dso->has_build_id) {
1813 /*
1814 * Last resort, if we don't have a build-id and couldn't find
1815 * any vmlinux file, try the running kernel kallsyms table.
1816 */
1817 goto proc_kallsyms;
1818 }
1819
1820 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1821 sizeof(host_build_id)) == 0)
1822 is_host = dso__build_id_equal(dso, host_build_id);
1823
1824 /* Try a fast path for /proc/kallsyms if possible */
1825 if (is_host) {
1826 /*
1827 * Do not check the build-id cache, unless we know we cannot use
1828 * /proc/kcore or module maps don't match to /proc/kallsyms.
1829 * To check readability of /proc/kcore, do not use access(R_OK)
1830 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1831 * can't check it.
1832 */
1833 if (filename__readable("/proc/kcore") &&
1834 !validate_kcore_addresses("/proc/kallsyms", map))
1835 goto proc_kallsyms;
1836 }
1837
1838 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1839
1840 /* Find kallsyms in build-id cache with kcore */
1841 scnprintf(path, sizeof(path), "%s/%s/%s",
1842 buildid_dir, DSO__NAME_KCORE, sbuild_id);
1843
1844 if (!find_matching_kcore(map, path, sizeof(path)))
1845 return strdup(path);
1846
1847 /* Use current /proc/kallsyms if possible */
1848 if (is_host) {
1849 proc_kallsyms:
1850 return strdup("/proc/kallsyms");
1851 }
1852
1853 /* Finally, find a cache of kallsyms */
1854 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1855 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1856 sbuild_id);
1857 return NULL;
1858 }
1859
1860 return strdup(path);
1861 }
1862
1863 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1864 {
1865 int err;
1866 const char *kallsyms_filename = NULL;
1867 char *kallsyms_allocated_filename = NULL;
1868 /*
1869 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1870 * it and only it, reporting errors to the user if it cannot be used.
1871 *
1872 * For instance, try to analyse an ARM perf.data file _without_ a
1873 * build-id, or if the user specifies the wrong path to the right
1874 * vmlinux file, obviously we can't fallback to another vmlinux (a
1875 * x86_86 one, on the machine where analysis is being performed, say),
1876 * or worse, /proc/kallsyms.
1877 *
1878 * If the specified file _has_ a build-id and there is a build-id
1879 * section in the perf.data file, we will still do the expected
1880 * validation in dso__load_vmlinux and will bail out if they don't
1881 * match.
1882 */
1883 if (symbol_conf.kallsyms_name != NULL) {
1884 kallsyms_filename = symbol_conf.kallsyms_name;
1885 goto do_kallsyms;
1886 }
1887
1888 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1889 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
1890 }
1891
1892 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1893 err = dso__load_vmlinux_path(dso, map);
1894 if (err > 0)
1895 return err;
1896 }
1897
1898 /* do not try local files if a symfs was given */
1899 if (symbol_conf.symfs[0] != 0)
1900 return -1;
1901
1902 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1903 if (!kallsyms_allocated_filename)
1904 return -1;
1905
1906 kallsyms_filename = kallsyms_allocated_filename;
1907
1908 do_kallsyms:
1909 err = dso__load_kallsyms(dso, kallsyms_filename, map);
1910 if (err > 0)
1911 pr_debug("Using %s for symbols\n", kallsyms_filename);
1912 free(kallsyms_allocated_filename);
1913
1914 if (err > 0 && !dso__is_kcore(dso)) {
1915 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1916 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
1917 map__fixup_start(map);
1918 map__fixup_end(map);
1919 }
1920
1921 return err;
1922 }
1923
1924 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
1925 {
1926 int err;
1927 const char *kallsyms_filename = NULL;
1928 struct machine *machine;
1929 char path[PATH_MAX];
1930
1931 if (!map->groups) {
1932 pr_debug("Guest kernel map hasn't the point to groups\n");
1933 return -1;
1934 }
1935 machine = map->groups->machine;
1936
1937 if (machine__is_default_guest(machine)) {
1938 /*
1939 * if the user specified a vmlinux filename, use it and only
1940 * it, reporting errors to the user if it cannot be used.
1941 * Or use file guest_kallsyms inputted by user on commandline
1942 */
1943 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1944 err = dso__load_vmlinux(dso, map,
1945 symbol_conf.default_guest_vmlinux_name,
1946 false);
1947 return err;
1948 }
1949
1950 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1951 if (!kallsyms_filename)
1952 return -1;
1953 } else {
1954 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1955 kallsyms_filename = path;
1956 }
1957
1958 err = dso__load_kallsyms(dso, kallsyms_filename, map);
1959 if (err > 0)
1960 pr_debug("Using %s for symbols\n", kallsyms_filename);
1961 if (err > 0 && !dso__is_kcore(dso)) {
1962 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1963 machine__mmap_name(machine, path, sizeof(path));
1964 dso__set_long_name(dso, strdup(path), true);
1965 map__fixup_start(map);
1966 map__fixup_end(map);
1967 }
1968
1969 return err;
1970 }
1971
1972 static void vmlinux_path__exit(void)
1973 {
1974 while (--vmlinux_path__nr_entries >= 0)
1975 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1976 vmlinux_path__nr_entries = 0;
1977
1978 zfree(&vmlinux_path);
1979 }
1980
1981 static const char * const vmlinux_paths[] = {
1982 "vmlinux",
1983 "/boot/vmlinux"
1984 };
1985
1986 static const char * const vmlinux_paths_upd[] = {
1987 "/boot/vmlinux-%s",
1988 "/usr/lib/debug/boot/vmlinux-%s",
1989 "/lib/modules/%s/build/vmlinux",
1990 "/usr/lib/debug/lib/modules/%s/vmlinux",
1991 "/usr/lib/debug/boot/vmlinux-%s.debug"
1992 };
1993
1994 static int vmlinux_path__add(const char *new_entry)
1995 {
1996 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
1997 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1998 return -1;
1999 ++vmlinux_path__nr_entries;
2000
2001 return 0;
2002 }
2003
2004 static int vmlinux_path__init(struct perf_env *env)
2005 {
2006 struct utsname uts;
2007 char bf[PATH_MAX];
2008 char *kernel_version;
2009 unsigned int i;
2010
2011 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2012 ARRAY_SIZE(vmlinux_paths_upd)));
2013 if (vmlinux_path == NULL)
2014 return -1;
2015
2016 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2017 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2018 goto out_fail;
2019
2020 /* only try kernel version if no symfs was given */
2021 if (symbol_conf.symfs[0] != 0)
2022 return 0;
2023
2024 if (env) {
2025 kernel_version = env->os_release;
2026 } else {
2027 if (uname(&uts) < 0)
2028 goto out_fail;
2029
2030 kernel_version = uts.release;
2031 }
2032
2033 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2034 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2035 if (vmlinux_path__add(bf) < 0)
2036 goto out_fail;
2037 }
2038
2039 return 0;
2040
2041 out_fail:
2042 vmlinux_path__exit();
2043 return -1;
2044 }
2045
2046 int setup_list(struct strlist **list, const char *list_str,
2047 const char *list_name)
2048 {
2049 if (list_str == NULL)
2050 return 0;
2051
2052 *list = strlist__new(list_str, NULL);
2053 if (!*list) {
2054 pr_err("problems parsing %s list\n", list_name);
2055 return -1;
2056 }
2057
2058 symbol_conf.has_filter = true;
2059 return 0;
2060 }
2061
2062 int setup_intlist(struct intlist **list, const char *list_str,
2063 const char *list_name)
2064 {
2065 if (list_str == NULL)
2066 return 0;
2067
2068 *list = intlist__new(list_str);
2069 if (!*list) {
2070 pr_err("problems parsing %s list\n", list_name);
2071 return -1;
2072 }
2073 return 0;
2074 }
2075
2076 static bool symbol__read_kptr_restrict(void)
2077 {
2078 bool value = false;
2079 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2080
2081 if (fp != NULL) {
2082 char line[8];
2083
2084 if (fgets(line, sizeof(line), fp) != NULL)
2085 value = ((geteuid() != 0) || (getuid() != 0)) ?
2086 (atoi(line) != 0) :
2087 (atoi(line) == 2);
2088
2089 fclose(fp);
2090 }
2091
2092 return value;
2093 }
2094
2095 int symbol__annotation_init(void)
2096 {
2097 if (symbol_conf.initialized) {
2098 pr_err("Annotation needs to be init before symbol__init()\n");
2099 return -1;
2100 }
2101
2102 if (symbol_conf.init_annotation) {
2103 pr_warning("Annotation being initialized multiple times\n");
2104 return 0;
2105 }
2106
2107 symbol_conf.priv_size += sizeof(struct annotation);
2108 symbol_conf.init_annotation = true;
2109 return 0;
2110 }
2111
2112 int symbol__init(struct perf_env *env)
2113 {
2114 const char *symfs;
2115
2116 if (symbol_conf.initialized)
2117 return 0;
2118
2119 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2120
2121 symbol__elf_init();
2122
2123 if (symbol_conf.sort_by_name)
2124 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2125 sizeof(struct symbol));
2126
2127 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2128 return -1;
2129
2130 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2131 pr_err("'.' is the only non valid --field-separator argument\n");
2132 return -1;
2133 }
2134
2135 if (setup_list(&symbol_conf.dso_list,
2136 symbol_conf.dso_list_str, "dso") < 0)
2137 return -1;
2138
2139 if (setup_list(&symbol_conf.comm_list,
2140 symbol_conf.comm_list_str, "comm") < 0)
2141 goto out_free_dso_list;
2142
2143 if (setup_intlist(&symbol_conf.pid_list,
2144 symbol_conf.pid_list_str, "pid") < 0)
2145 goto out_free_comm_list;
2146
2147 if (setup_intlist(&symbol_conf.tid_list,
2148 symbol_conf.tid_list_str, "tid") < 0)
2149 goto out_free_pid_list;
2150
2151 if (setup_list(&symbol_conf.sym_list,
2152 symbol_conf.sym_list_str, "symbol") < 0)
2153 goto out_free_tid_list;
2154
2155 if (setup_list(&symbol_conf.bt_stop_list,
2156 symbol_conf.bt_stop_list_str, "symbol") < 0)
2157 goto out_free_sym_list;
2158
2159 /*
2160 * A path to symbols of "/" is identical to ""
2161 * reset here for simplicity.
2162 */
2163 symfs = realpath(symbol_conf.symfs, NULL);
2164 if (symfs == NULL)
2165 symfs = symbol_conf.symfs;
2166 if (strcmp(symfs, "/") == 0)
2167 symbol_conf.symfs = "";
2168 if (symfs != symbol_conf.symfs)
2169 free((void *)symfs);
2170
2171 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2172
2173 symbol_conf.initialized = true;
2174 return 0;
2175
2176 out_free_sym_list:
2177 strlist__delete(symbol_conf.sym_list);
2178 out_free_tid_list:
2179 intlist__delete(symbol_conf.tid_list);
2180 out_free_pid_list:
2181 intlist__delete(symbol_conf.pid_list);
2182 out_free_comm_list:
2183 strlist__delete(symbol_conf.comm_list);
2184 out_free_dso_list:
2185 strlist__delete(symbol_conf.dso_list);
2186 return -1;
2187 }
2188
2189 void symbol__exit(void)
2190 {
2191 if (!symbol_conf.initialized)
2192 return;
2193 strlist__delete(symbol_conf.bt_stop_list);
2194 strlist__delete(symbol_conf.sym_list);
2195 strlist__delete(symbol_conf.dso_list);
2196 strlist__delete(symbol_conf.comm_list);
2197 intlist__delete(symbol_conf.tid_list);
2198 intlist__delete(symbol_conf.pid_list);
2199 vmlinux_path__exit();
2200 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2201 symbol_conf.bt_stop_list = NULL;
2202 symbol_conf.initialized = false;
2203 }
2204
2205 int symbol__config_symfs(const struct option *opt __maybe_unused,
2206 const char *dir, int unset __maybe_unused)
2207 {
2208 char *bf = NULL;
2209 int ret;
2210
2211 symbol_conf.symfs = strdup(dir);
2212 if (symbol_conf.symfs == NULL)
2213 return -ENOMEM;
2214
2215 /* skip the locally configured cache if a symfs is given, and
2216 * config buildid dir to symfs/.debug
2217 */
2218 ret = asprintf(&bf, "%s/%s", dir, ".debug");
2219 if (ret < 0)
2220 return -ENOMEM;
2221
2222 set_buildid_dir(bf);
2223
2224 free(bf);
2225 return 0;
2226 }
CRIS linux kernel tree