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regulator: s2mps11: Adjust supported buck voltages to real values
[linux/fpc-iii.git] / tools / perf / util / symbol.c
blob758bf5f74e6ee91a7ff09ac667bf6ac6d18a9d73
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 "map.h"
21 #include "symbol.h"
22 #include "strlist.h"
23 #include "intlist.h"
24 #include "namespaces.h"
25 #include "header.h"
26 #include "path.h"
27 #include "sane_ctype.h"
28
29 #include <elf.h>
30 #include <limits.h>
31 #include <symbol/kallsyms.h>
32 #include <sys/utsname.h>
33
34 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
35 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
36 static bool symbol__is_idle(const char *name);
37
38 int vmlinux_path__nr_entries;
39 char **vmlinux_path;
40
41 struct symbol_conf symbol_conf = {
42 .use_modules = true,
43 .try_vmlinux_path = 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' || symbol_type == 'B';
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_cached *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_cached(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_cached(&next->rb_node, symbols);
191 symbol__delete(next);
192 goto again;
193 } else {
194 nd = rb_next(&curr->rb_node);
195 rb_erase_cached(&curr->rb_node, symbols);
196 symbol__delete(curr);
197 }
198 }
199 }
200
201 void symbols__fixup_end(struct rb_root_cached *symbols)
202 {
203 struct rb_node *nd, *prevnd = rb_first_cached(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_cached *symbols)
287 {
288 struct symbol *pos;
289 struct rb_node *next = rb_first_cached(symbols);
290
291 while (next) {
292 pos = rb_entry(next, struct symbol, rb_node);
293 next = rb_next(&pos->rb_node);
294 rb_erase_cached(&pos->rb_node, symbols);
295 symbol__delete(pos);
296 }
297 }
298
299 void __symbols__insert(struct rb_root_cached *symbols,
300 struct symbol *sym, bool kernel)
301 {
302 struct rb_node **p = &symbols->rb_root.rb_node;
303 struct rb_node *parent = NULL;
304 const u64 ip = sym->start;
305 struct symbol *s;
306 bool leftmost = true;
307
308 if (kernel) {
309 const char *name = sym->name;
310 /*
311 * ppc64 uses function descriptors and appends a '.' to the
312 * start of every instruction address. Remove it.
313 */
314 if (name[0] == '.')
315 name++;
316 sym->idle = symbol__is_idle(name);
317 }
318
319 while (*p != NULL) {
320 parent = *p;
321 s = rb_entry(parent, struct symbol, rb_node);
322 if (ip < s->start)
323 p = &(*p)->rb_left;
324 else {
325 p = &(*p)->rb_right;
326 leftmost = false;
327 }
328 }
329 rb_link_node(&sym->rb_node, parent, p);
330 rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
331 }
332
333 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
334 {
335 __symbols__insert(symbols, sym, false);
336 }
337
338 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
339 {
340 struct rb_node *n;
341
342 if (symbols == NULL)
343 return NULL;
344
345 n = symbols->rb_root.rb_node;
346
347 while (n) {
348 struct symbol *s = rb_entry(n, struct symbol, rb_node);
349
350 if (ip < s->start)
351 n = n->rb_left;
352 else if (ip > s->end || (ip == s->end && ip != s->start))
353 n = n->rb_right;
354 else
355 return s;
356 }
357
358 return NULL;
359 }
360
361 static struct symbol *symbols__first(struct rb_root_cached *symbols)
362 {
363 struct rb_node *n = rb_first_cached(symbols);
364
365 if (n)
366 return rb_entry(n, struct symbol, rb_node);
367
368 return NULL;
369 }
370
371 static struct symbol *symbols__last(struct rb_root_cached *symbols)
372 {
373 struct rb_node *n = rb_last(&symbols->rb_root);
374
375 if (n)
376 return rb_entry(n, struct symbol, rb_node);
377
378 return NULL;
379 }
380
381 static struct symbol *symbols__next(struct symbol *sym)
382 {
383 struct rb_node *n = rb_next(&sym->rb_node);
384
385 if (n)
386 return rb_entry(n, struct symbol, rb_node);
387
388 return NULL;
389 }
390
391 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
392 {
393 struct rb_node **p = &symbols->rb_root.rb_node;
394 struct rb_node *parent = NULL;
395 struct symbol_name_rb_node *symn, *s;
396 bool leftmost = true;
397
398 symn = container_of(sym, struct symbol_name_rb_node, sym);
399
400 while (*p != NULL) {
401 parent = *p;
402 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
403 if (strcmp(sym->name, s->sym.name) < 0)
404 p = &(*p)->rb_left;
405 else {
406 p = &(*p)->rb_right;
407 leftmost = false;
408 }
409 }
410 rb_link_node(&symn->rb_node, parent, p);
411 rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
412 }
413
414 static void symbols__sort_by_name(struct rb_root_cached *symbols,
415 struct rb_root_cached *source)
416 {
417 struct rb_node *nd;
418
419 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
420 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
421 symbols__insert_by_name(symbols, pos);
422 }
423 }
424
425 int symbol__match_symbol_name(const char *name, const char *str,
426 enum symbol_tag_include includes)
427 {
428 const char *versioning;
429
430 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
431 (versioning = strstr(name, "@@"))) {
432 int len = strlen(str);
433
434 if (len < versioning - name)
435 len = versioning - name;
436
437 return arch__compare_symbol_names_n(name, str, len);
438 } else
439 return arch__compare_symbol_names(name, str);
440 }
441
442 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
443 const char *name,
444 enum symbol_tag_include includes)
445 {
446 struct rb_node *n;
447 struct symbol_name_rb_node *s = NULL;
448
449 if (symbols == NULL)
450 return NULL;
451
452 n = symbols->rb_root.rb_node;
453
454 while (n) {
455 int cmp;
456
457 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
458 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
459
460 if (cmp > 0)
461 n = n->rb_left;
462 else if (cmp < 0)
463 n = n->rb_right;
464 else
465 break;
466 }
467
468 if (n == NULL)
469 return NULL;
470
471 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
472 /* return first symbol that has same name (if any) */
473 for (n = rb_prev(n); n; n = rb_prev(n)) {
474 struct symbol_name_rb_node *tmp;
475
476 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
477 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
478 break;
479
480 s = tmp;
481 }
482
483 return &s->sym;
484 }
485
486 void dso__reset_find_symbol_cache(struct dso *dso)
487 {
488 dso->last_find_result.addr = 0;
489 dso->last_find_result.symbol = NULL;
490 }
491
492 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
493 {
494 __symbols__insert(&dso->symbols, sym, dso->kernel);
495
496 /* update the symbol cache if necessary */
497 if (dso->last_find_result.addr >= sym->start &&
498 (dso->last_find_result.addr < sym->end ||
499 sym->start == sym->end)) {
500 dso->last_find_result.symbol = sym;
501 }
502 }
503
504 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
505 {
506 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
507 dso->last_find_result.addr = addr;
508 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
509 }
510
511 return dso->last_find_result.symbol;
512 }
513
514 struct symbol *dso__first_symbol(struct dso *dso)
515 {
516 return symbols__first(&dso->symbols);
517 }
518
519 struct symbol *dso__last_symbol(struct dso *dso)
520 {
521 return symbols__last(&dso->symbols);
522 }
523
524 struct symbol *dso__next_symbol(struct symbol *sym)
525 {
526 return symbols__next(sym);
527 }
528
529 struct symbol *symbol__next_by_name(struct symbol *sym)
530 {
531 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
532 struct rb_node *n = rb_next(&s->rb_node);
533
534 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
535 }
536
537 /*
538 * Returns first symbol that matched with @name.
539 */
540 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
541 {
542 struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
543 SYMBOL_TAG_INCLUDE__NONE);
544 if (!s)
545 s = symbols__find_by_name(&dso->symbol_names, name,
546 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
547 return s;
548 }
549
550 void dso__sort_by_name(struct dso *dso)
551 {
552 dso__set_sorted_by_name(dso);
553 return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
554 }
555
556 int modules__parse(const char *filename, void *arg,
557 int (*process_module)(void *arg, const char *name,
558 u64 start, u64 size))
559 {
560 char *line = NULL;
561 size_t n;
562 FILE *file;
563 int err = 0;
564
565 file = fopen(filename, "r");
566 if (file == NULL)
567 return -1;
568
569 while (1) {
570 char name[PATH_MAX];
571 u64 start, size;
572 char *sep, *endptr;
573 ssize_t line_len;
574
575 line_len = getline(&line, &n, file);
576 if (line_len < 0) {
577 if (feof(file))
578 break;
579 err = -1;
580 goto out;
581 }
582
583 if (!line) {
584 err = -1;
585 goto out;
586 }
587
588 line[--line_len] = '\0'; /* \n */
589
590 sep = strrchr(line, 'x');
591 if (sep == NULL)
592 continue;
593
594 hex2u64(sep + 1, &start);
595
596 sep = strchr(line, ' ');
597 if (sep == NULL)
598 continue;
599
600 *sep = '\0';
601
602 scnprintf(name, sizeof(name), "[%s]", line);
603
604 size = strtoul(sep + 1, &endptr, 0);
605 if (*endptr != ' ' && *endptr != '\t')
606 continue;
607
608 err = process_module(arg, name, start, size);
609 if (err)
610 break;
611 }
612 out:
613 free(line);
614 fclose(file);
615 return err;
616 }
617
618 /*
619 * These are symbols in the kernel image, so make sure that
620 * sym is from a kernel DSO.
621 */
622 static bool symbol__is_idle(const char *name)
623 {
624 const char * const idle_symbols[] = {
625 "arch_cpu_idle",
626 "cpu_idle",
627 "cpu_startup_entry",
628 "intel_idle",
629 "default_idle",
630 "native_safe_halt",
631 "enter_idle",
632 "exit_idle",
633 "mwait_idle",
634 "mwait_idle_with_hints",
635 "poll_idle",
636 "ppc64_runlatch_off",
637 "pseries_dedicated_idle_sleep",
638 NULL
639 };
640 int i;
641
642 for (i = 0; idle_symbols[i]; i++) {
643 if (!strcmp(idle_symbols[i], name))
644 return true;
645 }
646
647 return false;
648 }
649
650 static int map__process_kallsym_symbol(void *arg, const char *name,
651 char type, u64 start)
652 {
653 struct symbol *sym;
654 struct dso *dso = arg;
655 struct rb_root_cached *root = &dso->symbols;
656
657 if (!symbol_type__filter(type))
658 return 0;
659
660 /*
661 * module symbols are not sorted so we add all
662 * symbols, setting length to 0, and rely on
663 * symbols__fixup_end() to fix it up.
664 */
665 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
666 if (sym == NULL)
667 return -ENOMEM;
668 /*
669 * We will pass the symbols to the filter later, in
670 * map__split_kallsyms, when we have split the maps per module
671 */
672 __symbols__insert(root, sym, !strchr(name, '['));
673
674 return 0;
675 }
676
677 /*
678 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
679 * so that we can in the next step set the symbol ->end address and then
680 * call kernel_maps__split_kallsyms.
681 */
682 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
683 {
684 return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
685 }
686
687 static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
688 {
689 struct map *curr_map;
690 struct symbol *pos;
691 int count = 0;
692 struct rb_root_cached old_root = dso->symbols;
693 struct rb_root_cached *root = &dso->symbols;
694 struct rb_node *next = rb_first_cached(root);
695
696 if (!kmaps)
697 return -1;
698
699 *root = RB_ROOT_CACHED;
700
701 while (next) {
702 char *module;
703
704 pos = rb_entry(next, struct symbol, rb_node);
705 next = rb_next(&pos->rb_node);
706
707 rb_erase_cached(&pos->rb_node, &old_root);
708 RB_CLEAR_NODE(&pos->rb_node);
709 module = strchr(pos->name, '\t');
710 if (module)
711 *module = '\0';
712
713 curr_map = map_groups__find(kmaps, pos->start);
714
715 if (!curr_map) {
716 symbol__delete(pos);
717 continue;
718 }
719
720 pos->start -= curr_map->start - curr_map->pgoff;
721 if (pos->end > curr_map->end)
722 pos->end = curr_map->end;
723 if (pos->end)
724 pos->end -= curr_map->start - curr_map->pgoff;
725 symbols__insert(&curr_map->dso->symbols, pos);
726 ++count;
727 }
728
729 /* Symbols have been adjusted */
730 dso->adjust_symbols = 1;
731
732 return count;
733 }
734
735 /*
736 * Split the symbols into maps, making sure there are no overlaps, i.e. the
737 * kernel range is broken in several maps, named [kernel].N, as we don't have
738 * the original ELF section names vmlinux have.
739 */
740 static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
741 struct map *initial_map)
742 {
743 struct machine *machine;
744 struct map *curr_map = initial_map;
745 struct symbol *pos;
746 int count = 0, moved = 0;
747 struct rb_root_cached *root = &dso->symbols;
748 struct rb_node *next = rb_first_cached(root);
749 int kernel_range = 0;
750 bool x86_64;
751
752 if (!kmaps)
753 return -1;
754
755 machine = kmaps->machine;
756
757 x86_64 = machine__is(machine, "x86_64");
758
759 while (next) {
760 char *module;
761
762 pos = rb_entry(next, struct symbol, rb_node);
763 next = rb_next(&pos->rb_node);
764
765 module = strchr(pos->name, '\t');
766 if (module) {
767 if (!symbol_conf.use_modules)
768 goto discard_symbol;
769
770 *module++ = '\0';
771
772 if (strcmp(curr_map->dso->short_name, module)) {
773 if (curr_map != initial_map &&
774 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
775 machine__is_default_guest(machine)) {
776 /*
777 * We assume all symbols of a module are
778 * continuous in * kallsyms, so curr_map
779 * points to a module and all its
780 * symbols are in its kmap. Mark it as
781 * loaded.
782 */
783 dso__set_loaded(curr_map->dso);
784 }
785
786 curr_map = map_groups__find_by_name(kmaps, module);
787 if (curr_map == NULL) {
788 pr_debug("%s/proc/{kallsyms,modules} "
789 "inconsistency while looking "
790 "for \"%s\" module!\n",
791 machine->root_dir, module);
792 curr_map = initial_map;
793 goto discard_symbol;
794 }
795
796 if (curr_map->dso->loaded &&
797 !machine__is_default_guest(machine))
798 goto discard_symbol;
799 }
800 /*
801 * So that we look just like we get from .ko files,
802 * i.e. not prelinked, relative to initial_map->start.
803 */
804 pos->start = curr_map->map_ip(curr_map, pos->start);
805 pos->end = curr_map->map_ip(curr_map, pos->end);
806 } else if (x86_64 && is_entry_trampoline(pos->name)) {
807 /*
808 * These symbols are not needed anymore since the
809 * trampoline maps refer to the text section and it's
810 * symbols instead. Avoid having to deal with
811 * relocations, and the assumption that the first symbol
812 * is the start of kernel text, by simply removing the
813 * symbols at this point.
814 */
815 goto discard_symbol;
816 } else if (curr_map != initial_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 = initial_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);
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 != initial_map) {
862 rb_erase_cached(&pos->rb_node, root);
863 symbols__insert(&curr_map->dso->symbols, pos);
864 ++moved;
865 } else
866 ++count;
867
868 continue;
869 discard_symbol:
870 rb_erase_cached(&pos->rb_node, root);
871 symbol__delete(pos);
872 }
873
874 if (curr_map != initial_map &&
875 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
876 machine__is_default_guest(kmaps->machine)) {
877 dso__set_loaded(curr_map->dso);
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 struct map *map_groups__first(struct map_groups *mg)
1039 {
1040 return maps__first(&mg->maps);
1041 }
1042
1043 static int do_validate_kcore_modules(const char *filename,
1044 struct map_groups *kmaps)
1045 {
1046 struct rb_root modules = RB_ROOT;
1047 struct map *old_map;
1048 int err;
1049
1050 err = read_proc_modules(filename, &modules);
1051 if (err)
1052 return err;
1053
1054 old_map = map_groups__first(kmaps);
1055 while (old_map) {
1056 struct map *next = map_groups__next(old_map);
1057 struct module_info *mi;
1058
1059 if (!__map__is_kmodule(old_map)) {
1060 old_map = next;
1061 continue;
1062 }
1063
1064 /* Module must be in memory at the same address */
1065 mi = find_module(old_map->dso->short_name, &modules);
1066 if (!mi || mi->start != old_map->start) {
1067 err = -EINVAL;
1068 goto out;
1069 }
1070
1071 old_map = next;
1072 }
1073 out:
1074 delete_modules(&modules);
1075 return err;
1076 }
1077
1078 /*
1079 * If kallsyms is referenced by name then we look for filename in the same
1080 * directory.
1081 */
1082 static bool filename_from_kallsyms_filename(char *filename,
1083 const char *base_name,
1084 const char *kallsyms_filename)
1085 {
1086 char *name;
1087
1088 strcpy(filename, kallsyms_filename);
1089 name = strrchr(filename, '/');
1090 if (!name)
1091 return false;
1092
1093 name += 1;
1094
1095 if (!strcmp(name, "kallsyms")) {
1096 strcpy(name, base_name);
1097 return true;
1098 }
1099
1100 return false;
1101 }
1102
1103 static int validate_kcore_modules(const char *kallsyms_filename,
1104 struct map *map)
1105 {
1106 struct map_groups *kmaps = map__kmaps(map);
1107 char modules_filename[PATH_MAX];
1108
1109 if (!kmaps)
1110 return -EINVAL;
1111
1112 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1113 kallsyms_filename))
1114 return -EINVAL;
1115
1116 if (do_validate_kcore_modules(modules_filename, kmaps))
1117 return -EINVAL;
1118
1119 return 0;
1120 }
1121
1122 static int validate_kcore_addresses(const char *kallsyms_filename,
1123 struct map *map)
1124 {
1125 struct kmap *kmap = map__kmap(map);
1126
1127 if (!kmap)
1128 return -EINVAL;
1129
1130 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1131 u64 start;
1132
1133 if (kallsyms__get_function_start(kallsyms_filename,
1134 kmap->ref_reloc_sym->name, &start))
1135 return -ENOENT;
1136 if (start != kmap->ref_reloc_sym->addr)
1137 return -EINVAL;
1138 }
1139
1140 return validate_kcore_modules(kallsyms_filename, map);
1141 }
1142
1143 struct kcore_mapfn_data {
1144 struct dso *dso;
1145 struct list_head maps;
1146 };
1147
1148 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1149 {
1150 struct kcore_mapfn_data *md = data;
1151 struct map *map;
1152
1153 map = map__new2(start, md->dso);
1154 if (map == NULL)
1155 return -ENOMEM;
1156
1157 map->end = map->start + len;
1158 map->pgoff = pgoff;
1159
1160 list_add(&map->node, &md->maps);
1161
1162 return 0;
1163 }
1164
1165 static int dso__load_kcore(struct dso *dso, struct map *map,
1166 const char *kallsyms_filename)
1167 {
1168 struct map_groups *kmaps = map__kmaps(map);
1169 struct kcore_mapfn_data md;
1170 struct map *old_map, *new_map, *replacement_map = NULL;
1171 struct machine *machine;
1172 bool is_64_bit;
1173 int err, fd;
1174 char kcore_filename[PATH_MAX];
1175 u64 stext;
1176
1177 if (!kmaps)
1178 return -EINVAL;
1179
1180 machine = kmaps->machine;
1181
1182 /* This function requires that the map is the kernel map */
1183 if (!__map__is_kernel(map))
1184 return -EINVAL;
1185
1186 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1187 kallsyms_filename))
1188 return -EINVAL;
1189
1190 /* Modules and kernel must be present at their original addresses */
1191 if (validate_kcore_addresses(kallsyms_filename, map))
1192 return -EINVAL;
1193
1194 md.dso = dso;
1195 INIT_LIST_HEAD(&md.maps);
1196
1197 fd = open(kcore_filename, O_RDONLY);
1198 if (fd < 0) {
1199 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1200 kcore_filename);
1201 return -EINVAL;
1202 }
1203
1204 /* Read new maps into temporary lists */
1205 err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1206 &is_64_bit);
1207 if (err)
1208 goto out_err;
1209 dso->is_64_bit = is_64_bit;
1210
1211 if (list_empty(&md.maps)) {
1212 err = -EINVAL;
1213 goto out_err;
1214 }
1215
1216 /* Remove old maps */
1217 old_map = map_groups__first(kmaps);
1218 while (old_map) {
1219 struct map *next = map_groups__next(old_map);
1220
1221 if (old_map != map)
1222 map_groups__remove(kmaps, old_map);
1223 old_map = next;
1224 }
1225 machine->trampolines_mapped = false;
1226
1227 /* Find the kernel map using the '_stext' symbol */
1228 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1229 list_for_each_entry(new_map, &md.maps, node) {
1230 if (stext >= new_map->start && stext < new_map->end) {
1231 replacement_map = new_map;
1232 break;
1233 }
1234 }
1235 }
1236
1237 if (!replacement_map)
1238 replacement_map = list_entry(md.maps.next, struct map, node);
1239
1240 /* Add new maps */
1241 while (!list_empty(&md.maps)) {
1242 new_map = list_entry(md.maps.next, struct map, node);
1243 list_del_init(&new_map->node);
1244 if (new_map == replacement_map) {
1245 map->start = new_map->start;
1246 map->end = new_map->end;
1247 map->pgoff = new_map->pgoff;
1248 map->map_ip = new_map->map_ip;
1249 map->unmap_ip = new_map->unmap_ip;
1250 /* Ensure maps are correctly ordered */
1251 map__get(map);
1252 map_groups__remove(kmaps, map);
1253 map_groups__insert(kmaps, map);
1254 map__put(map);
1255 } else {
1256 map_groups__insert(kmaps, new_map);
1257 }
1258
1259 map__put(new_map);
1260 }
1261
1262 if (machine__is(machine, "x86_64")) {
1263 u64 addr;
1264
1265 /*
1266 * If one of the corresponding symbols is there, assume the
1267 * entry trampoline maps are too.
1268 */
1269 if (!kallsyms__get_function_start(kallsyms_filename,
1270 ENTRY_TRAMPOLINE_NAME,
1271 &addr))
1272 machine->trampolines_mapped = true;
1273 }
1274
1275 /*
1276 * Set the data type and long name so that kcore can be read via
1277 * dso__data_read_addr().
1278 */
1279 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1280 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1281 else
1282 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1283 dso__set_long_name(dso, strdup(kcore_filename), true);
1284
1285 close(fd);
1286
1287 if (map->prot & PROT_EXEC)
1288 pr_debug("Using %s for kernel object code\n", kcore_filename);
1289 else
1290 pr_debug("Using %s for kernel data\n", kcore_filename);
1291
1292 return 0;
1293
1294 out_err:
1295 while (!list_empty(&md.maps)) {
1296 map = list_entry(md.maps.next, struct map, node);
1297 list_del_init(&map->node);
1298 map__put(map);
1299 }
1300 close(fd);
1301 return -EINVAL;
1302 }
1303
1304 /*
1305 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1306 * delta based on the relocation reference symbol.
1307 */
1308 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1309 {
1310 u64 addr;
1311
1312 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1313 return 0;
1314
1315 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1316 return -1;
1317
1318 *delta = addr - kmap->ref_reloc_sym->addr;
1319 return 0;
1320 }
1321
1322 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1323 struct map *map, bool no_kcore)
1324 {
1325 struct kmap *kmap = map__kmap(map);
1326 u64 delta = 0;
1327
1328 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1329 return -1;
1330
1331 if (!kmap || !kmap->kmaps)
1332 return -1;
1333
1334 if (dso__load_all_kallsyms(dso, filename) < 0)
1335 return -1;
1336
1337 if (kallsyms__delta(kmap, filename, &delta))
1338 return -1;
1339
1340 symbols__fixup_end(&dso->symbols);
1341 symbols__fixup_duplicate(&dso->symbols);
1342
1343 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1344 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1345 else
1346 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1347
1348 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1349 return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
1350 else
1351 return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
1352 }
1353
1354 int dso__load_kallsyms(struct dso *dso, const char *filename,
1355 struct map *map)
1356 {
1357 return __dso__load_kallsyms(dso, filename, map, false);
1358 }
1359
1360 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1361 {
1362 char *line = NULL;
1363 size_t n;
1364 FILE *file;
1365 int nr_syms = 0;
1366
1367 file = fopen(map_path, "r");
1368 if (file == NULL)
1369 goto out_failure;
1370
1371 while (!feof(file)) {
1372 u64 start, size;
1373 struct symbol *sym;
1374 int line_len, len;
1375
1376 line_len = getline(&line, &n, file);
1377 if (line_len < 0)
1378 break;
1379
1380 if (!line)
1381 goto out_failure;
1382
1383 line[--line_len] = '\0'; /* \n */
1384
1385 len = hex2u64(line, &start);
1386
1387 len++;
1388 if (len + 2 >= line_len)
1389 continue;
1390
1391 len += hex2u64(line + len, &size);
1392
1393 len++;
1394 if (len + 2 >= line_len)
1395 continue;
1396
1397 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1398
1399 if (sym == NULL)
1400 goto out_delete_line;
1401
1402 symbols__insert(&dso->symbols, sym);
1403 nr_syms++;
1404 }
1405
1406 free(line);
1407 fclose(file);
1408
1409 return nr_syms;
1410
1411 out_delete_line:
1412 free(line);
1413 out_failure:
1414 return -1;
1415 }
1416
1417 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1418 enum dso_binary_type type)
1419 {
1420 switch (type) {
1421 case DSO_BINARY_TYPE__JAVA_JIT:
1422 case DSO_BINARY_TYPE__DEBUGLINK:
1423 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1424 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1425 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1426 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1427 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1428 return !kmod && dso->kernel == DSO_TYPE_USER;
1429
1430 case DSO_BINARY_TYPE__KALLSYMS:
1431 case DSO_BINARY_TYPE__VMLINUX:
1432 case DSO_BINARY_TYPE__KCORE:
1433 return dso->kernel == DSO_TYPE_KERNEL;
1434
1435 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1436 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1437 case DSO_BINARY_TYPE__GUEST_KCORE:
1438 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1439
1440 case DSO_BINARY_TYPE__GUEST_KMODULE:
1441 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1442 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1443 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1444 /*
1445 * kernel modules know their symtab type - it's set when
1446 * creating a module dso in machine__findnew_module_map().
1447 */
1448 return kmod && dso->symtab_type == type;
1449
1450 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1451 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1452 return true;
1453
1454 case DSO_BINARY_TYPE__NOT_FOUND:
1455 default:
1456 return false;
1457 }
1458 }
1459
1460 /* Checks for the existence of the perf-<pid>.map file in two different
1461 * locations. First, if the process is a separate mount namespace, check in
1462 * that namespace using the pid of the innermost pid namespace. If's not in a
1463 * namespace, or the file can't be found there, try in the mount namespace of
1464 * the tracing process using our view of its pid.
1465 */
1466 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1467 struct nsinfo **nsip)
1468 {
1469 struct nscookie nsc;
1470 struct nsinfo *nsi;
1471 struct nsinfo *nnsi;
1472 int rc = -1;
1473
1474 nsi = *nsip;
1475
1476 if (nsi->need_setns) {
1477 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1478 nsinfo__mountns_enter(nsi, &nsc);
1479 rc = access(filebuf, R_OK);
1480 nsinfo__mountns_exit(&nsc);
1481 if (rc == 0)
1482 return rc;
1483 }
1484
1485 nnsi = nsinfo__copy(nsi);
1486 if (nnsi) {
1487 nsinfo__put(nsi);
1488
1489 nnsi->need_setns = false;
1490 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1491 *nsip = nnsi;
1492 rc = 0;
1493 }
1494
1495 return rc;
1496 }
1497
1498 int dso__load(struct dso *dso, struct map *map)
1499 {
1500 char *name;
1501 int ret = -1;
1502 u_int i;
1503 struct machine *machine;
1504 char *root_dir = (char *) "";
1505 int ss_pos = 0;
1506 struct symsrc ss_[2];
1507 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1508 bool kmod;
1509 bool perfmap;
1510 unsigned char build_id[BUILD_ID_SIZE];
1511 struct nscookie nsc;
1512 char newmapname[PATH_MAX];
1513 const char *map_path = dso->long_name;
1514
1515 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1516 if (perfmap) {
1517 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1518 sizeof(newmapname), &dso->nsinfo) == 0)) {
1519 map_path = newmapname;
1520 }
1521 }
1522
1523 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1524 pthread_mutex_lock(&dso->lock);
1525
1526 /* check again under the dso->lock */
1527 if (dso__loaded(dso)) {
1528 ret = 1;
1529 goto out;
1530 }
1531
1532 if (map->groups && map->groups->machine)
1533 machine = map->groups->machine;
1534 else
1535 machine = NULL;
1536
1537 if (dso->kernel) {
1538 if (dso->kernel == DSO_TYPE_KERNEL)
1539 ret = dso__load_kernel_sym(dso, map);
1540 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1541 ret = dso__load_guest_kernel_sym(dso, map);
1542
1543 if (machine__is(machine, "x86_64"))
1544 machine__map_x86_64_entry_trampolines(machine, dso);
1545 goto out;
1546 }
1547
1548 dso->adjust_symbols = 0;
1549
1550 if (perfmap) {
1551 ret = dso__load_perf_map(map_path, dso);
1552 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1553 DSO_BINARY_TYPE__NOT_FOUND;
1554 goto out;
1555 }
1556
1557 if (machine)
1558 root_dir = machine->root_dir;
1559
1560 name = malloc(PATH_MAX);
1561 if (!name)
1562 goto out;
1563
1564 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1565 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1566 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1567 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1568
1569
1570 /*
1571 * Read the build id if possible. This is required for
1572 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1573 */
1574 if (!dso->has_build_id &&
1575 is_regular_file(dso->long_name)) {
1576 __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1577 if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1578 dso__set_build_id(dso, build_id);
1579 }
1580
1581 /*
1582 * Iterate over candidate debug images.
1583 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1584 * and/or opd section) for processing.
1585 */
1586 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1587 struct symsrc *ss = &ss_[ss_pos];
1588 bool next_slot = false;
1589 bool is_reg;
1590 bool nsexit;
1591 int sirc = -1;
1592
1593 enum dso_binary_type symtab_type = binary_type_symtab[i];
1594
1595 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1596 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1597
1598 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1599 continue;
1600
1601 if (dso__read_binary_type_filename(dso, symtab_type,
1602 root_dir, name, PATH_MAX))
1603 continue;
1604
1605 if (nsexit)
1606 nsinfo__mountns_exit(&nsc);
1607
1608 is_reg = is_regular_file(name);
1609 if (is_reg)
1610 sirc = symsrc__init(ss, dso, name, symtab_type);
1611
1612 if (nsexit)
1613 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1614
1615 if (!is_reg || sirc < 0)
1616 continue;
1617
1618 if (!syms_ss && symsrc__has_symtab(ss)) {
1619 syms_ss = ss;
1620 next_slot = true;
1621 if (!dso->symsrc_filename)
1622 dso->symsrc_filename = strdup(name);
1623 }
1624
1625 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1626 runtime_ss = ss;
1627 next_slot = true;
1628 }
1629
1630 if (next_slot) {
1631 ss_pos++;
1632
1633 if (syms_ss && runtime_ss)
1634 break;
1635 } else {
1636 symsrc__destroy(ss);
1637 }
1638
1639 }
1640
1641 if (!runtime_ss && !syms_ss)
1642 goto out_free;
1643
1644 if (runtime_ss && !syms_ss) {
1645 syms_ss = runtime_ss;
1646 }
1647
1648 /* We'll have to hope for the best */
1649 if (!runtime_ss && syms_ss)
1650 runtime_ss = syms_ss;
1651
1652 if (syms_ss)
1653 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1654 else
1655 ret = -1;
1656
1657 if (ret > 0) {
1658 int nr_plt;
1659
1660 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1661 if (nr_plt > 0)
1662 ret += nr_plt;
1663 }
1664
1665 for (; ss_pos > 0; ss_pos--)
1666 symsrc__destroy(&ss_[ss_pos - 1]);
1667 out_free:
1668 free(name);
1669 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1670 ret = 0;
1671 out:
1672 dso__set_loaded(dso);
1673 pthread_mutex_unlock(&dso->lock);
1674 nsinfo__mountns_exit(&nsc);
1675
1676 return ret;
1677 }
1678
1679 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
1680 {
1681 struct maps *maps = &mg->maps;
1682 struct map *map;
1683 struct rb_node *node;
1684
1685 down_read(&maps->lock);
1686
1687 for (node = maps->names.rb_node; node; ) {
1688 int rc;
1689
1690 map = rb_entry(node, struct map, rb_node_name);
1691
1692 rc = strcmp(map->dso->short_name, name);
1693 if (rc < 0)
1694 node = node->rb_left;
1695 else if (rc > 0)
1696 node = node->rb_right;
1697 else
1698
1699 goto out_unlock;
1700 }
1701
1702 map = NULL;
1703
1704 out_unlock:
1705 up_read(&maps->lock);
1706 return map;
1707 }
1708
1709 int dso__load_vmlinux(struct dso *dso, struct map *map,
1710 const char *vmlinux, bool vmlinux_allocated)
1711 {
1712 int err = -1;
1713 struct symsrc ss;
1714 char symfs_vmlinux[PATH_MAX];
1715 enum dso_binary_type symtab_type;
1716
1717 if (vmlinux[0] == '/')
1718 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1719 else
1720 symbol__join_symfs(symfs_vmlinux, vmlinux);
1721
1722 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1723 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1724 else
1725 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1726
1727 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1728 return -1;
1729
1730 err = dso__load_sym(dso, map, &ss, &ss, 0);
1731 symsrc__destroy(&ss);
1732
1733 if (err > 0) {
1734 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1735 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1736 else
1737 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1738 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1739 dso__set_loaded(dso);
1740 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1741 }
1742
1743 return err;
1744 }
1745
1746 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1747 {
1748 int i, err = 0;
1749 char *filename = NULL;
1750
1751 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1752 vmlinux_path__nr_entries + 1);
1753
1754 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1755 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1756 if (err > 0)
1757 goto out;
1758 }
1759
1760 if (!symbol_conf.ignore_vmlinux_buildid)
1761 filename = dso__build_id_filename(dso, NULL, 0, false);
1762 if (filename != NULL) {
1763 err = dso__load_vmlinux(dso, map, filename, true);
1764 if (err > 0)
1765 goto out;
1766 free(filename);
1767 }
1768 out:
1769 return err;
1770 }
1771
1772 static bool visible_dir_filter(const char *name, struct dirent *d)
1773 {
1774 if (d->d_type != DT_DIR)
1775 return false;
1776 return lsdir_no_dot_filter(name, d);
1777 }
1778
1779 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1780 {
1781 char kallsyms_filename[PATH_MAX];
1782 int ret = -1;
1783 struct strlist *dirs;
1784 struct str_node *nd;
1785
1786 dirs = lsdir(dir, visible_dir_filter);
1787 if (!dirs)
1788 return -1;
1789
1790 strlist__for_each_entry(nd, dirs) {
1791 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1792 "%s/%s/kallsyms", dir, nd->s);
1793 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1794 strlcpy(dir, kallsyms_filename, dir_sz);
1795 ret = 0;
1796 break;
1797 }
1798 }
1799
1800 strlist__delete(dirs);
1801
1802 return ret;
1803 }
1804
1805 /*
1806 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1807 * since access(R_OK) only checks with real UID/GID but open() use effective
1808 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1809 */
1810 static bool filename__readable(const char *file)
1811 {
1812 int fd = open(file, O_RDONLY);
1813 if (fd < 0)
1814 return false;
1815 close(fd);
1816 return true;
1817 }
1818
1819 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1820 {
1821 u8 host_build_id[BUILD_ID_SIZE];
1822 char sbuild_id[SBUILD_ID_SIZE];
1823 bool is_host = false;
1824 char path[PATH_MAX];
1825
1826 if (!dso->has_build_id) {
1827 /*
1828 * Last resort, if we don't have a build-id and couldn't find
1829 * any vmlinux file, try the running kernel kallsyms table.
1830 */
1831 goto proc_kallsyms;
1832 }
1833
1834 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1835 sizeof(host_build_id)) == 0)
1836 is_host = dso__build_id_equal(dso, host_build_id);
1837
1838 /* Try a fast path for /proc/kallsyms if possible */
1839 if (is_host) {
1840 /*
1841 * Do not check the build-id cache, unless we know we cannot use
1842 * /proc/kcore or module maps don't match to /proc/kallsyms.
1843 * To check readability of /proc/kcore, do not use access(R_OK)
1844 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1845 * can't check it.
1846 */
1847 if (filename__readable("/proc/kcore") &&
1848 !validate_kcore_addresses("/proc/kallsyms", map))
1849 goto proc_kallsyms;
1850 }
1851
1852 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1853
1854 /* Find kallsyms in build-id cache with kcore */
1855 scnprintf(path, sizeof(path), "%s/%s/%s",
1856 buildid_dir, DSO__NAME_KCORE, sbuild_id);
1857
1858 if (!find_matching_kcore(map, path, sizeof(path)))
1859 return strdup(path);
1860
1861 /* Use current /proc/kallsyms if possible */
1862 if (is_host) {
1863 proc_kallsyms:
1864 return strdup("/proc/kallsyms");
1865 }
1866
1867 /* Finally, find a cache of kallsyms */
1868 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1869 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1870 sbuild_id);
1871 return NULL;
1872 }
1873
1874 return strdup(path);
1875 }
1876
1877 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1878 {
1879 int err;
1880 const char *kallsyms_filename = NULL;
1881 char *kallsyms_allocated_filename = NULL;
1882 /*
1883 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1884 * it and only it, reporting errors to the user if it cannot be used.
1885 *
1886 * For instance, try to analyse an ARM perf.data file _without_ a
1887 * build-id, or if the user specifies the wrong path to the right
1888 * vmlinux file, obviously we can't fallback to another vmlinux (a
1889 * x86_86 one, on the machine where analysis is being performed, say),
1890 * or worse, /proc/kallsyms.
1891 *
1892 * If the specified file _has_ a build-id and there is a build-id
1893 * section in the perf.data file, we will still do the expected
1894 * validation in dso__load_vmlinux and will bail out if they don't
1895 * match.
1896 */
1897 if (symbol_conf.kallsyms_name != NULL) {
1898 kallsyms_filename = symbol_conf.kallsyms_name;
1899 goto do_kallsyms;
1900 }
1901
1902 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1903 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
1904 }
1905
1906 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1907 err = dso__load_vmlinux_path(dso, map);
1908 if (err > 0)
1909 return err;
1910 }
1911
1912 /* do not try local files if a symfs was given */
1913 if (symbol_conf.symfs[0] != 0)
1914 return -1;
1915
1916 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1917 if (!kallsyms_allocated_filename)
1918 return -1;
1919
1920 kallsyms_filename = kallsyms_allocated_filename;
1921
1922 do_kallsyms:
1923 err = dso__load_kallsyms(dso, kallsyms_filename, map);
1924 if (err > 0)
1925 pr_debug("Using %s for symbols\n", kallsyms_filename);
1926 free(kallsyms_allocated_filename);
1927
1928 if (err > 0 && !dso__is_kcore(dso)) {
1929 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1930 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
1931 map__fixup_start(map);
1932 map__fixup_end(map);
1933 }
1934
1935 return err;
1936 }
1937
1938 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
1939 {
1940 int err;
1941 const char *kallsyms_filename = NULL;
1942 struct machine *machine;
1943 char path[PATH_MAX];
1944
1945 if (!map->groups) {
1946 pr_debug("Guest kernel map hasn't the point to groups\n");
1947 return -1;
1948 }
1949 machine = map->groups->machine;
1950
1951 if (machine__is_default_guest(machine)) {
1952 /*
1953 * if the user specified a vmlinux filename, use it and only
1954 * it, reporting errors to the user if it cannot be used.
1955 * Or use file guest_kallsyms inputted by user on commandline
1956 */
1957 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1958 err = dso__load_vmlinux(dso, map,
1959 symbol_conf.default_guest_vmlinux_name,
1960 false);
1961 return err;
1962 }
1963
1964 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1965 if (!kallsyms_filename)
1966 return -1;
1967 } else {
1968 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1969 kallsyms_filename = path;
1970 }
1971
1972 err = dso__load_kallsyms(dso, kallsyms_filename, map);
1973 if (err > 0)
1974 pr_debug("Using %s for symbols\n", kallsyms_filename);
1975 if (err > 0 && !dso__is_kcore(dso)) {
1976 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1977 dso__set_long_name(dso, machine->mmap_name, false);
1978 map__fixup_start(map);
1979 map__fixup_end(map);
1980 }
1981
1982 return err;
1983 }
1984
1985 static void vmlinux_path__exit(void)
1986 {
1987 while (--vmlinux_path__nr_entries >= 0)
1988 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1989 vmlinux_path__nr_entries = 0;
1990
1991 zfree(&vmlinux_path);
1992 }
1993
1994 static const char * const vmlinux_paths[] = {
1995 "vmlinux",
1996 "/boot/vmlinux"
1997 };
1998
1999 static const char * const vmlinux_paths_upd[] = {
2000 "/boot/vmlinux-%s",
2001 "/usr/lib/debug/boot/vmlinux-%s",
2002 "/lib/modules/%s/build/vmlinux",
2003 "/usr/lib/debug/lib/modules/%s/vmlinux",
2004 "/usr/lib/debug/boot/vmlinux-%s.debug"
2005 };
2006
2007 static int vmlinux_path__add(const char *new_entry)
2008 {
2009 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2010 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2011 return -1;
2012 ++vmlinux_path__nr_entries;
2013
2014 return 0;
2015 }
2016
2017 static int vmlinux_path__init(struct perf_env *env)
2018 {
2019 struct utsname uts;
2020 char bf[PATH_MAX];
2021 char *kernel_version;
2022 unsigned int i;
2023
2024 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2025 ARRAY_SIZE(vmlinux_paths_upd)));
2026 if (vmlinux_path == NULL)
2027 return -1;
2028
2029 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2030 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2031 goto out_fail;
2032
2033 /* only try kernel version if no symfs was given */
2034 if (symbol_conf.symfs[0] != 0)
2035 return 0;
2036
2037 if (env) {
2038 kernel_version = env->os_release;
2039 } else {
2040 if (uname(&uts) < 0)
2041 goto out_fail;
2042
2043 kernel_version = uts.release;
2044 }
2045
2046 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2047 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2048 if (vmlinux_path__add(bf) < 0)
2049 goto out_fail;
2050 }
2051
2052 return 0;
2053
2054 out_fail:
2055 vmlinux_path__exit();
2056 return -1;
2057 }
2058
2059 int setup_list(struct strlist **list, const char *list_str,
2060 const char *list_name)
2061 {
2062 if (list_str == NULL)
2063 return 0;
2064
2065 *list = strlist__new(list_str, NULL);
2066 if (!*list) {
2067 pr_err("problems parsing %s list\n", list_name);
2068 return -1;
2069 }
2070
2071 symbol_conf.has_filter = true;
2072 return 0;
2073 }
2074
2075 int setup_intlist(struct intlist **list, const char *list_str,
2076 const char *list_name)
2077 {
2078 if (list_str == NULL)
2079 return 0;
2080
2081 *list = intlist__new(list_str);
2082 if (!*list) {
2083 pr_err("problems parsing %s list\n", list_name);
2084 return -1;
2085 }
2086 return 0;
2087 }
2088
2089 static bool symbol__read_kptr_restrict(void)
2090 {
2091 bool value = false;
2092 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2093
2094 if (fp != NULL) {
2095 char line[8];
2096
2097 if (fgets(line, sizeof(line), fp) != NULL)
2098 value = ((geteuid() != 0) || (getuid() != 0)) ?
2099 (atoi(line) != 0) :
2100 (atoi(line) == 2);
2101
2102 fclose(fp);
2103 }
2104
2105 return value;
2106 }
2107
2108 int symbol__annotation_init(void)
2109 {
2110 if (symbol_conf.init_annotation)
2111 return 0;
2112
2113 if (symbol_conf.initialized) {
2114 pr_err("Annotation needs to be init before symbol__init()\n");
2115 return -1;
2116 }
2117
2118 symbol_conf.priv_size += sizeof(struct annotation);
2119 symbol_conf.init_annotation = true;
2120 return 0;
2121 }
2122
2123 int symbol__init(struct perf_env *env)
2124 {
2125 const char *symfs;
2126
2127 if (symbol_conf.initialized)
2128 return 0;
2129
2130 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2131
2132 symbol__elf_init();
2133
2134 if (symbol_conf.sort_by_name)
2135 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2136 sizeof(struct symbol));
2137
2138 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2139 return -1;
2140
2141 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2142 pr_err("'.' is the only non valid --field-separator argument\n");
2143 return -1;
2144 }
2145
2146 if (setup_list(&symbol_conf.dso_list,
2147 symbol_conf.dso_list_str, "dso") < 0)
2148 return -1;
2149
2150 if (setup_list(&symbol_conf.comm_list,
2151 symbol_conf.comm_list_str, "comm") < 0)
2152 goto out_free_dso_list;
2153
2154 if (setup_intlist(&symbol_conf.pid_list,
2155 symbol_conf.pid_list_str, "pid") < 0)
2156 goto out_free_comm_list;
2157
2158 if (setup_intlist(&symbol_conf.tid_list,
2159 symbol_conf.tid_list_str, "tid") < 0)
2160 goto out_free_pid_list;
2161
2162 if (setup_list(&symbol_conf.sym_list,
2163 symbol_conf.sym_list_str, "symbol") < 0)
2164 goto out_free_tid_list;
2165
2166 if (setup_list(&symbol_conf.bt_stop_list,
2167 symbol_conf.bt_stop_list_str, "symbol") < 0)
2168 goto out_free_sym_list;
2169
2170 /*
2171 * A path to symbols of "/" is identical to ""
2172 * reset here for simplicity.
2173 */
2174 symfs = realpath(symbol_conf.symfs, NULL);
2175 if (symfs == NULL)
2176 symfs = symbol_conf.symfs;
2177 if (strcmp(symfs, "/") == 0)
2178 symbol_conf.symfs = "";
2179 if (symfs != symbol_conf.symfs)
2180 free((void *)symfs);
2181
2182 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2183
2184 symbol_conf.initialized = true;
2185 return 0;
2186
2187 out_free_sym_list:
2188 strlist__delete(symbol_conf.sym_list);
2189 out_free_tid_list:
2190 intlist__delete(symbol_conf.tid_list);
2191 out_free_pid_list:
2192 intlist__delete(symbol_conf.pid_list);
2193 out_free_comm_list:
2194 strlist__delete(symbol_conf.comm_list);
2195 out_free_dso_list:
2196 strlist__delete(symbol_conf.dso_list);
2197 return -1;
2198 }
2199
2200 void symbol__exit(void)
2201 {
2202 if (!symbol_conf.initialized)
2203 return;
2204 strlist__delete(symbol_conf.bt_stop_list);
2205 strlist__delete(symbol_conf.sym_list);
2206 strlist__delete(symbol_conf.dso_list);
2207 strlist__delete(symbol_conf.comm_list);
2208 intlist__delete(symbol_conf.tid_list);
2209 intlist__delete(symbol_conf.pid_list);
2210 vmlinux_path__exit();
2211 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2212 symbol_conf.bt_stop_list = NULL;
2213 symbol_conf.initialized = false;
2214 }
2215
2216 int symbol__config_symfs(const struct option *opt __maybe_unused,
2217 const char *dir, int unset __maybe_unused)
2218 {
2219 char *bf = NULL;
2220 int ret;
2221
2222 symbol_conf.symfs = strdup(dir);
2223 if (symbol_conf.symfs == NULL)
2224 return -ENOMEM;
2225
2226 /* skip the locally configured cache if a symfs is given, and
2227 * config buildid dir to symfs/.debug
2228 */
2229 ret = asprintf(&bf, "%s/%s", dir, ".debug");
2230 if (ret < 0)
2231 return -ENOMEM;
2232
2233 set_buildid_dir(bf);
2234
2235 free(bf);
2236 return 0;
2237 }
2238
2239 struct mem_info *mem_info__get(struct mem_info *mi)
2240 {
2241 if (mi)
2242 refcount_inc(&mi->refcnt);
2243 return mi;
2244 }
2245
2246 void mem_info__put(struct mem_info *mi)
2247 {
2248 if (mi && refcount_dec_and_test(&mi->refcnt))
2249 free(mi);
2250 }
2251
2252 struct mem_info *mem_info__new(void)
2253 {
2254 struct mem_info *mi = zalloc(sizeof(*mi));
2255
2256 if (mi)
2257 refcount_set(&mi->refcnt, 1);
2258 return mi;
2259 }
Linux with added FPC-III support