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KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernel
[linux/fpc-iii.git] / tools / perf / util / symbol.c
bloba8f80e427674d9319b71bd0a7f20ea3459f00ddb
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/capability.h>
8 #include <linux/kernel.h>
9 #include <linux/mman.h>
10 #include <linux/string.h>
11 #include <linux/time64.h>
12 #include <sys/types.h>
13 #include <sys/stat.h>
14 #include <sys/param.h>
15 #include <fcntl.h>
16 #include <unistd.h>
17 #include <inttypes.h>
18 #include "annotate.h"
19 #include "build-id.h"
20 #include "cap.h"
21 #include "dso.h"
22 #include "util.h" // lsdir()
23 #include "debug.h"
24 #include "event.h"
25 #include "machine.h"
26 #include "map.h"
27 #include "symbol.h"
28 #include "map_symbol.h"
29 #include "mem-events.h"
30 #include "symsrc.h"
31 #include "strlist.h"
32 #include "intlist.h"
33 #include "namespaces.h"
34 #include "header.h"
35 #include "path.h"
36 #include <linux/ctype.h>
37 #include <linux/zalloc.h>
38
39 #include <elf.h>
40 #include <limits.h>
41 #include <symbol/kallsyms.h>
42 #include <sys/utsname.h>
43
44 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
45 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
46 static bool symbol__is_idle(const char *name);
47
48 int vmlinux_path__nr_entries;
49 char **vmlinux_path;
50
51 struct symbol_conf symbol_conf = {
52 .nanosecs = false,
53 .use_modules = true,
54 .try_vmlinux_path = true,
55 .demangle = true,
56 .demangle_kernel = false,
57 .cumulate_callchain = true,
58 .time_quantum = 100 * NSEC_PER_MSEC, /* 100ms */
59 .show_hist_headers = true,
60 .symfs = "",
61 .event_group = true,
62 .inline_name = true,
63 .res_sample = 0,
64 };
65
66 static enum dso_binary_type binary_type_symtab[] = {
67 DSO_BINARY_TYPE__KALLSYMS,
68 DSO_BINARY_TYPE__GUEST_KALLSYMS,
69 DSO_BINARY_TYPE__JAVA_JIT,
70 DSO_BINARY_TYPE__DEBUGLINK,
71 DSO_BINARY_TYPE__BUILD_ID_CACHE,
72 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
73 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
74 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
75 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
76 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
77 DSO_BINARY_TYPE__GUEST_KMODULE,
78 DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
79 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
80 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
81 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
82 DSO_BINARY_TYPE__NOT_FOUND,
83 };
84
85 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
86
87 static bool symbol_type__filter(char symbol_type)
88 {
89 symbol_type = toupper(symbol_type);
90 return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
91 }
92
93 static int prefix_underscores_count(const char *str)
94 {
95 const char *tail = str;
96
97 while (*tail == '_')
98 tail++;
99
100 return tail - str;
101 }
102
103 void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
104 {
105 p->end = c->start;
106 }
107
108 const char * __weak arch__normalize_symbol_name(const char *name)
109 {
110 return name;
111 }
112
113 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
114 {
115 return strcmp(namea, nameb);
116 }
117
118 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
119 unsigned int n)
120 {
121 return strncmp(namea, nameb, n);
122 }
123
124 int __weak arch__choose_best_symbol(struct symbol *syma,
125 struct symbol *symb __maybe_unused)
126 {
127 /* Avoid "SyS" kernel syscall aliases */
128 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
129 return SYMBOL_B;
130 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
131 return SYMBOL_B;
132
133 return SYMBOL_A;
134 }
135
136 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
137 {
138 s64 a;
139 s64 b;
140 size_t na, nb;
141
142 /* Prefer a symbol with non zero length */
143 a = syma->end - syma->start;
144 b = symb->end - symb->start;
145 if ((b == 0) && (a > 0))
146 return SYMBOL_A;
147 else if ((a == 0) && (b > 0))
148 return SYMBOL_B;
149
150 /* Prefer a non weak symbol over a weak one */
151 a = syma->binding == STB_WEAK;
152 b = symb->binding == STB_WEAK;
153 if (b && !a)
154 return SYMBOL_A;
155 if (a && !b)
156 return SYMBOL_B;
157
158 /* Prefer a global symbol over a non global one */
159 a = syma->binding == STB_GLOBAL;
160 b = symb->binding == STB_GLOBAL;
161 if (a && !b)
162 return SYMBOL_A;
163 if (b && !a)
164 return SYMBOL_B;
165
166 /* Prefer a symbol with less underscores */
167 a = prefix_underscores_count(syma->name);
168 b = prefix_underscores_count(symb->name);
169 if (b > a)
170 return SYMBOL_A;
171 else if (a > b)
172 return SYMBOL_B;
173
174 /* Choose the symbol with the longest name */
175 na = strlen(syma->name);
176 nb = strlen(symb->name);
177 if (na > nb)
178 return SYMBOL_A;
179 else if (na < nb)
180 return SYMBOL_B;
181
182 return arch__choose_best_symbol(syma, symb);
183 }
184
185 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
186 {
187 struct rb_node *nd;
188 struct symbol *curr, *next;
189
190 if (symbol_conf.allow_aliases)
191 return;
192
193 nd = rb_first_cached(symbols);
194
195 while (nd) {
196 curr = rb_entry(nd, struct symbol, rb_node);
197 again:
198 nd = rb_next(&curr->rb_node);
199 next = rb_entry(nd, struct symbol, rb_node);
200
201 if (!nd)
202 break;
203
204 if (curr->start != next->start)
205 continue;
206
207 if (choose_best_symbol(curr, next) == SYMBOL_A) {
208 rb_erase_cached(&next->rb_node, symbols);
209 symbol__delete(next);
210 goto again;
211 } else {
212 nd = rb_next(&curr->rb_node);
213 rb_erase_cached(&curr->rb_node, symbols);
214 symbol__delete(curr);
215 }
216 }
217 }
218
219 void symbols__fixup_end(struct rb_root_cached *symbols)
220 {
221 struct rb_node *nd, *prevnd = rb_first_cached(symbols);
222 struct symbol *curr, *prev;
223
224 if (prevnd == NULL)
225 return;
226
227 curr = rb_entry(prevnd, struct symbol, rb_node);
228
229 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
230 prev = curr;
231 curr = rb_entry(nd, struct symbol, rb_node);
232
233 if (prev->end == prev->start && prev->end != curr->start)
234 arch__symbols__fixup_end(prev, curr);
235 }
236
237 /* Last entry */
238 if (curr->end == curr->start)
239 curr->end = roundup(curr->start, 4096) + 4096;
240 }
241
242 void map_groups__fixup_end(struct map_groups *mg)
243 {
244 struct maps *maps = &mg->maps;
245 struct map *next, *curr;
246
247 down_write(&maps->lock);
248
249 curr = maps__first(maps);
250 if (curr == NULL)
251 goto out_unlock;
252
253 for (next = map__next(curr); next; next = map__next(curr)) {
254 if (!curr->end)
255 curr->end = next->start;
256 curr = next;
257 }
258
259 /*
260 * We still haven't the actual symbols, so guess the
261 * last map final address.
262 */
263 if (!curr->end)
264 curr->end = ~0ULL;
265
266 out_unlock:
267 up_write(&maps->lock);
268 }
269
270 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
271 {
272 size_t namelen = strlen(name) + 1;
273 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
274 sizeof(*sym) + namelen));
275 if (sym == NULL)
276 return NULL;
277
278 if (symbol_conf.priv_size) {
279 if (symbol_conf.init_annotation) {
280 struct annotation *notes = (void *)sym;
281 pthread_mutex_init(&notes->lock, NULL);
282 }
283 sym = ((void *)sym) + symbol_conf.priv_size;
284 }
285
286 sym->start = start;
287 sym->end = len ? start + len : start;
288 sym->type = type;
289 sym->binding = binding;
290 sym->namelen = namelen - 1;
291
292 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
293 __func__, name, start, sym->end);
294 memcpy(sym->name, name, namelen);
295
296 return sym;
297 }
298
299 void symbol__delete(struct symbol *sym)
300 {
301 free(((void *)sym) - symbol_conf.priv_size);
302 }
303
304 void symbols__delete(struct rb_root_cached *symbols)
305 {
306 struct symbol *pos;
307 struct rb_node *next = rb_first_cached(symbols);
308
309 while (next) {
310 pos = rb_entry(next, struct symbol, rb_node);
311 next = rb_next(&pos->rb_node);
312 rb_erase_cached(&pos->rb_node, symbols);
313 symbol__delete(pos);
314 }
315 }
316
317 void __symbols__insert(struct rb_root_cached *symbols,
318 struct symbol *sym, bool kernel)
319 {
320 struct rb_node **p = &symbols->rb_root.rb_node;
321 struct rb_node *parent = NULL;
322 const u64 ip = sym->start;
323 struct symbol *s;
324 bool leftmost = true;
325
326 if (kernel) {
327 const char *name = sym->name;
328 /*
329 * ppc64 uses function descriptors and appends a '.' to the
330 * start of every instruction address. Remove it.
331 */
332 if (name[0] == '.')
333 name++;
334 sym->idle = symbol__is_idle(name);
335 }
336
337 while (*p != NULL) {
338 parent = *p;
339 s = rb_entry(parent, struct symbol, rb_node);
340 if (ip < s->start)
341 p = &(*p)->rb_left;
342 else {
343 p = &(*p)->rb_right;
344 leftmost = false;
345 }
346 }
347 rb_link_node(&sym->rb_node, parent, p);
348 rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
349 }
350
351 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
352 {
353 __symbols__insert(symbols, sym, false);
354 }
355
356 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
357 {
358 struct rb_node *n;
359
360 if (symbols == NULL)
361 return NULL;
362
363 n = symbols->rb_root.rb_node;
364
365 while (n) {
366 struct symbol *s = rb_entry(n, struct symbol, rb_node);
367
368 if (ip < s->start)
369 n = n->rb_left;
370 else if (ip > s->end || (ip == s->end && ip != s->start))
371 n = n->rb_right;
372 else
373 return s;
374 }
375
376 return NULL;
377 }
378
379 static struct symbol *symbols__first(struct rb_root_cached *symbols)
380 {
381 struct rb_node *n = rb_first_cached(symbols);
382
383 if (n)
384 return rb_entry(n, struct symbol, rb_node);
385
386 return NULL;
387 }
388
389 static struct symbol *symbols__last(struct rb_root_cached *symbols)
390 {
391 struct rb_node *n = rb_last(&symbols->rb_root);
392
393 if (n)
394 return rb_entry(n, struct symbol, rb_node);
395
396 return NULL;
397 }
398
399 static struct symbol *symbols__next(struct symbol *sym)
400 {
401 struct rb_node *n = rb_next(&sym->rb_node);
402
403 if (n)
404 return rb_entry(n, struct symbol, rb_node);
405
406 return NULL;
407 }
408
409 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
410 {
411 struct rb_node **p = &symbols->rb_root.rb_node;
412 struct rb_node *parent = NULL;
413 struct symbol_name_rb_node *symn, *s;
414 bool leftmost = true;
415
416 symn = container_of(sym, struct symbol_name_rb_node, sym);
417
418 while (*p != NULL) {
419 parent = *p;
420 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
421 if (strcmp(sym->name, s->sym.name) < 0)
422 p = &(*p)->rb_left;
423 else {
424 p = &(*p)->rb_right;
425 leftmost = false;
426 }
427 }
428 rb_link_node(&symn->rb_node, parent, p);
429 rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
430 }
431
432 static void symbols__sort_by_name(struct rb_root_cached *symbols,
433 struct rb_root_cached *source)
434 {
435 struct rb_node *nd;
436
437 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
438 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
439 symbols__insert_by_name(symbols, pos);
440 }
441 }
442
443 int symbol__match_symbol_name(const char *name, const char *str,
444 enum symbol_tag_include includes)
445 {
446 const char *versioning;
447
448 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
449 (versioning = strstr(name, "@@"))) {
450 int len = strlen(str);
451
452 if (len < versioning - name)
453 len = versioning - name;
454
455 return arch__compare_symbol_names_n(name, str, len);
456 } else
457 return arch__compare_symbol_names(name, str);
458 }
459
460 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
461 const char *name,
462 enum symbol_tag_include includes)
463 {
464 struct rb_node *n;
465 struct symbol_name_rb_node *s = NULL;
466
467 if (symbols == NULL)
468 return NULL;
469
470 n = symbols->rb_root.rb_node;
471
472 while (n) {
473 int cmp;
474
475 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
476 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
477
478 if (cmp > 0)
479 n = n->rb_left;
480 else if (cmp < 0)
481 n = n->rb_right;
482 else
483 break;
484 }
485
486 if (n == NULL)
487 return NULL;
488
489 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
490 /* return first symbol that has same name (if any) */
491 for (n = rb_prev(n); n; n = rb_prev(n)) {
492 struct symbol_name_rb_node *tmp;
493
494 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
495 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
496 break;
497
498 s = tmp;
499 }
500
501 return &s->sym;
502 }
503
504 void dso__reset_find_symbol_cache(struct dso *dso)
505 {
506 dso->last_find_result.addr = 0;
507 dso->last_find_result.symbol = NULL;
508 }
509
510 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
511 {
512 __symbols__insert(&dso->symbols, sym, dso->kernel);
513
514 /* update the symbol cache if necessary */
515 if (dso->last_find_result.addr >= sym->start &&
516 (dso->last_find_result.addr < sym->end ||
517 sym->start == sym->end)) {
518 dso->last_find_result.symbol = sym;
519 }
520 }
521
522 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
523 {
524 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
525 dso->last_find_result.addr = addr;
526 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
527 }
528
529 return dso->last_find_result.symbol;
530 }
531
532 struct symbol *dso__first_symbol(struct dso *dso)
533 {
534 return symbols__first(&dso->symbols);
535 }
536
537 struct symbol *dso__last_symbol(struct dso *dso)
538 {
539 return symbols__last(&dso->symbols);
540 }
541
542 struct symbol *dso__next_symbol(struct symbol *sym)
543 {
544 return symbols__next(sym);
545 }
546
547 struct symbol *symbol__next_by_name(struct symbol *sym)
548 {
549 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
550 struct rb_node *n = rb_next(&s->rb_node);
551
552 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
553 }
554
555 /*
556 * Returns first symbol that matched with @name.
557 */
558 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
559 {
560 struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
561 SYMBOL_TAG_INCLUDE__NONE);
562 if (!s)
563 s = symbols__find_by_name(&dso->symbol_names, name,
564 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
565 return s;
566 }
567
568 void dso__sort_by_name(struct dso *dso)
569 {
570 dso__set_sorted_by_name(dso);
571 return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
572 }
573
574 int modules__parse(const char *filename, void *arg,
575 int (*process_module)(void *arg, const char *name,
576 u64 start, u64 size))
577 {
578 char *line = NULL;
579 size_t n;
580 FILE *file;
581 int err = 0;
582
583 file = fopen(filename, "r");
584 if (file == NULL)
585 return -1;
586
587 while (1) {
588 char name[PATH_MAX];
589 u64 start, size;
590 char *sep, *endptr;
591 ssize_t line_len;
592
593 line_len = getline(&line, &n, file);
594 if (line_len < 0) {
595 if (feof(file))
596 break;
597 err = -1;
598 goto out;
599 }
600
601 if (!line) {
602 err = -1;
603 goto out;
604 }
605
606 line[--line_len] = '\0'; /* \n */
607
608 sep = strrchr(line, 'x');
609 if (sep == NULL)
610 continue;
611
612 hex2u64(sep + 1, &start);
613
614 sep = strchr(line, ' ');
615 if (sep == NULL)
616 continue;
617
618 *sep = '\0';
619
620 scnprintf(name, sizeof(name), "[%s]", line);
621
622 size = strtoul(sep + 1, &endptr, 0);
623 if (*endptr != ' ' && *endptr != '\t')
624 continue;
625
626 err = process_module(arg, name, start, size);
627 if (err)
628 break;
629 }
630 out:
631 free(line);
632 fclose(file);
633 return err;
634 }
635
636 /*
637 * These are symbols in the kernel image, so make sure that
638 * sym is from a kernel DSO.
639 */
640 static bool symbol__is_idle(const char *name)
641 {
642 const char * const idle_symbols[] = {
643 "arch_cpu_idle",
644 "cpu_idle",
645 "cpu_startup_entry",
646 "intel_idle",
647 "default_idle",
648 "native_safe_halt",
649 "enter_idle",
650 "exit_idle",
651 "mwait_idle",
652 "mwait_idle_with_hints",
653 "poll_idle",
654 "ppc64_runlatch_off",
655 "pseries_dedicated_idle_sleep",
656 NULL
657 };
658 int i;
659
660 for (i = 0; idle_symbols[i]; i++) {
661 if (!strcmp(idle_symbols[i], name))
662 return true;
663 }
664
665 return false;
666 }
667
668 static int map__process_kallsym_symbol(void *arg, const char *name,
669 char type, u64 start)
670 {
671 struct symbol *sym;
672 struct dso *dso = arg;
673 struct rb_root_cached *root = &dso->symbols;
674
675 if (!symbol_type__filter(type))
676 return 0;
677
678 /*
679 * module symbols are not sorted so we add all
680 * symbols, setting length to 0, and rely on
681 * symbols__fixup_end() to fix it up.
682 */
683 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
684 if (sym == NULL)
685 return -ENOMEM;
686 /*
687 * We will pass the symbols to the filter later, in
688 * map__split_kallsyms, when we have split the maps per module
689 */
690 __symbols__insert(root, sym, !strchr(name, '['));
691
692 return 0;
693 }
694
695 /*
696 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
697 * so that we can in the next step set the symbol ->end address and then
698 * call kernel_maps__split_kallsyms.
699 */
700 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
701 {
702 return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
703 }
704
705 static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
706 {
707 struct map *curr_map;
708 struct symbol *pos;
709 int count = 0;
710 struct rb_root_cached old_root = dso->symbols;
711 struct rb_root_cached *root = &dso->symbols;
712 struct rb_node *next = rb_first_cached(root);
713
714 if (!kmaps)
715 return -1;
716
717 *root = RB_ROOT_CACHED;
718
719 while (next) {
720 char *module;
721
722 pos = rb_entry(next, struct symbol, rb_node);
723 next = rb_next(&pos->rb_node);
724
725 rb_erase_cached(&pos->rb_node, &old_root);
726 RB_CLEAR_NODE(&pos->rb_node);
727 module = strchr(pos->name, '\t');
728 if (module)
729 *module = '\0';
730
731 curr_map = map_groups__find(kmaps, pos->start);
732
733 if (!curr_map) {
734 symbol__delete(pos);
735 continue;
736 }
737
738 pos->start -= curr_map->start - curr_map->pgoff;
739 if (pos->end > curr_map->end)
740 pos->end = curr_map->end;
741 if (pos->end)
742 pos->end -= curr_map->start - curr_map->pgoff;
743 symbols__insert(&curr_map->dso->symbols, pos);
744 ++count;
745 }
746
747 /* Symbols have been adjusted */
748 dso->adjust_symbols = 1;
749
750 return count;
751 }
752
753 /*
754 * Split the symbols into maps, making sure there are no overlaps, i.e. the
755 * kernel range is broken in several maps, named [kernel].N, as we don't have
756 * the original ELF section names vmlinux have.
757 */
758 static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
759 struct map *initial_map)
760 {
761 struct machine *machine;
762 struct map *curr_map = initial_map;
763 struct symbol *pos;
764 int count = 0, moved = 0;
765 struct rb_root_cached *root = &dso->symbols;
766 struct rb_node *next = rb_first_cached(root);
767 int kernel_range = 0;
768 bool x86_64;
769
770 if (!kmaps)
771 return -1;
772
773 machine = kmaps->machine;
774
775 x86_64 = machine__is(machine, "x86_64");
776
777 while (next) {
778 char *module;
779
780 pos = rb_entry(next, struct symbol, rb_node);
781 next = rb_next(&pos->rb_node);
782
783 module = strchr(pos->name, '\t');
784 if (module) {
785 if (!symbol_conf.use_modules)
786 goto discard_symbol;
787
788 *module++ = '\0';
789
790 if (strcmp(curr_map->dso->short_name, module)) {
791 if (curr_map != initial_map &&
792 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
793 machine__is_default_guest(machine)) {
794 /*
795 * We assume all symbols of a module are
796 * continuous in * kallsyms, so curr_map
797 * points to a module and all its
798 * symbols are in its kmap. Mark it as
799 * loaded.
800 */
801 dso__set_loaded(curr_map->dso);
802 }
803
804 curr_map = map_groups__find_by_name(kmaps, module);
805 if (curr_map == NULL) {
806 pr_debug("%s/proc/{kallsyms,modules} "
807 "inconsistency while looking "
808 "for \"%s\" module!\n",
809 machine->root_dir, module);
810 curr_map = initial_map;
811 goto discard_symbol;
812 }
813
814 if (curr_map->dso->loaded &&
815 !machine__is_default_guest(machine))
816 goto discard_symbol;
817 }
818 /*
819 * So that we look just like we get from .ko files,
820 * i.e. not prelinked, relative to initial_map->start.
821 */
822 pos->start = curr_map->map_ip(curr_map, pos->start);
823 pos->end = curr_map->map_ip(curr_map, pos->end);
824 } else if (x86_64 && is_entry_trampoline(pos->name)) {
825 /*
826 * These symbols are not needed anymore since the
827 * trampoline maps refer to the text section and it's
828 * symbols instead. Avoid having to deal with
829 * relocations, and the assumption that the first symbol
830 * is the start of kernel text, by simply removing the
831 * symbols at this point.
832 */
833 goto discard_symbol;
834 } else if (curr_map != initial_map) {
835 char dso_name[PATH_MAX];
836 struct dso *ndso;
837
838 if (delta) {
839 /* Kernel was relocated at boot time */
840 pos->start -= delta;
841 pos->end -= delta;
842 }
843
844 if (count == 0) {
845 curr_map = initial_map;
846 goto add_symbol;
847 }
848
849 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
850 snprintf(dso_name, sizeof(dso_name),
851 "[guest.kernel].%d",
852 kernel_range++);
853 else
854 snprintf(dso_name, sizeof(dso_name),
855 "[kernel].%d",
856 kernel_range++);
857
858 ndso = dso__new(dso_name);
859 if (ndso == NULL)
860 return -1;
861
862 ndso->kernel = dso->kernel;
863
864 curr_map = map__new2(pos->start, ndso);
865 if (curr_map == NULL) {
866 dso__put(ndso);
867 return -1;
868 }
869
870 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
871 map_groups__insert(kmaps, curr_map);
872 ++kernel_range;
873 } else if (delta) {
874 /* Kernel was relocated at boot time */
875 pos->start -= delta;
876 pos->end -= delta;
877 }
878 add_symbol:
879 if (curr_map != initial_map) {
880 rb_erase_cached(&pos->rb_node, root);
881 symbols__insert(&curr_map->dso->symbols, pos);
882 ++moved;
883 } else
884 ++count;
885
886 continue;
887 discard_symbol:
888 rb_erase_cached(&pos->rb_node, root);
889 symbol__delete(pos);
890 }
891
892 if (curr_map != initial_map &&
893 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
894 machine__is_default_guest(kmaps->machine)) {
895 dso__set_loaded(curr_map->dso);
896 }
897
898 return count + moved;
899 }
900
901 bool symbol__restricted_filename(const char *filename,
902 const char *restricted_filename)
903 {
904 bool restricted = false;
905
906 if (symbol_conf.kptr_restrict) {
907 char *r = realpath(filename, NULL);
908
909 if (r != NULL) {
910 restricted = strcmp(r, restricted_filename) == 0;
911 free(r);
912 return restricted;
913 }
914 }
915
916 return restricted;
917 }
918
919 struct module_info {
920 struct rb_node rb_node;
921 char *name;
922 u64 start;
923 };
924
925 static void add_module(struct module_info *mi, struct rb_root *modules)
926 {
927 struct rb_node **p = &modules->rb_node;
928 struct rb_node *parent = NULL;
929 struct module_info *m;
930
931 while (*p != NULL) {
932 parent = *p;
933 m = rb_entry(parent, struct module_info, rb_node);
934 if (strcmp(mi->name, m->name) < 0)
935 p = &(*p)->rb_left;
936 else
937 p = &(*p)->rb_right;
938 }
939 rb_link_node(&mi->rb_node, parent, p);
940 rb_insert_color(&mi->rb_node, modules);
941 }
942
943 static void delete_modules(struct rb_root *modules)
944 {
945 struct module_info *mi;
946 struct rb_node *next = rb_first(modules);
947
948 while (next) {
949 mi = rb_entry(next, struct module_info, rb_node);
950 next = rb_next(&mi->rb_node);
951 rb_erase(&mi->rb_node, modules);
952 zfree(&mi->name);
953 free(mi);
954 }
955 }
956
957 static struct module_info *find_module(const char *name,
958 struct rb_root *modules)
959 {
960 struct rb_node *n = modules->rb_node;
961
962 while (n) {
963 struct module_info *m;
964 int cmp;
965
966 m = rb_entry(n, struct module_info, rb_node);
967 cmp = strcmp(name, m->name);
968 if (cmp < 0)
969 n = n->rb_left;
970 else if (cmp > 0)
971 n = n->rb_right;
972 else
973 return m;
974 }
975
976 return NULL;
977 }
978
979 static int __read_proc_modules(void *arg, const char *name, u64 start,
980 u64 size __maybe_unused)
981 {
982 struct rb_root *modules = arg;
983 struct module_info *mi;
984
985 mi = zalloc(sizeof(struct module_info));
986 if (!mi)
987 return -ENOMEM;
988
989 mi->name = strdup(name);
990 mi->start = start;
991
992 if (!mi->name) {
993 free(mi);
994 return -ENOMEM;
995 }
996
997 add_module(mi, modules);
998
999 return 0;
1000 }
1001
1002 static int read_proc_modules(const char *filename, struct rb_root *modules)
1003 {
1004 if (symbol__restricted_filename(filename, "/proc/modules"))
1005 return -1;
1006
1007 if (modules__parse(filename, modules, __read_proc_modules)) {
1008 delete_modules(modules);
1009 return -1;
1010 }
1011
1012 return 0;
1013 }
1014
1015 int compare_proc_modules(const char *from, const char *to)
1016 {
1017 struct rb_root from_modules = RB_ROOT;
1018 struct rb_root to_modules = RB_ROOT;
1019 struct rb_node *from_node, *to_node;
1020 struct module_info *from_m, *to_m;
1021 int ret = -1;
1022
1023 if (read_proc_modules(from, &from_modules))
1024 return -1;
1025
1026 if (read_proc_modules(to, &to_modules))
1027 goto out_delete_from;
1028
1029 from_node = rb_first(&from_modules);
1030 to_node = rb_first(&to_modules);
1031 while (from_node) {
1032 if (!to_node)
1033 break;
1034
1035 from_m = rb_entry(from_node, struct module_info, rb_node);
1036 to_m = rb_entry(to_node, struct module_info, rb_node);
1037
1038 if (from_m->start != to_m->start ||
1039 strcmp(from_m->name, to_m->name))
1040 break;
1041
1042 from_node = rb_next(from_node);
1043 to_node = rb_next(to_node);
1044 }
1045
1046 if (!from_node && !to_node)
1047 ret = 0;
1048
1049 delete_modules(&to_modules);
1050 out_delete_from:
1051 delete_modules(&from_modules);
1052
1053 return ret;
1054 }
1055
1056 struct map *map_groups__first(struct map_groups *mg)
1057 {
1058 return maps__first(&mg->maps);
1059 }
1060
1061 static int do_validate_kcore_modules(const char *filename,
1062 struct map_groups *kmaps)
1063 {
1064 struct rb_root modules = RB_ROOT;
1065 struct map *old_map;
1066 int err;
1067
1068 err = read_proc_modules(filename, &modules);
1069 if (err)
1070 return err;
1071
1072 old_map = map_groups__first(kmaps);
1073 while (old_map) {
1074 struct map *next = map_groups__next(old_map);
1075 struct module_info *mi;
1076
1077 if (!__map__is_kmodule(old_map)) {
1078 old_map = next;
1079 continue;
1080 }
1081
1082 /* Module must be in memory at the same address */
1083 mi = find_module(old_map->dso->short_name, &modules);
1084 if (!mi || mi->start != old_map->start) {
1085 err = -EINVAL;
1086 goto out;
1087 }
1088
1089 old_map = next;
1090 }
1091 out:
1092 delete_modules(&modules);
1093 return err;
1094 }
1095
1096 /*
1097 * If kallsyms is referenced by name then we look for filename in the same
1098 * directory.
1099 */
1100 static bool filename_from_kallsyms_filename(char *filename,
1101 const char *base_name,
1102 const char *kallsyms_filename)
1103 {
1104 char *name;
1105
1106 strcpy(filename, kallsyms_filename);
1107 name = strrchr(filename, '/');
1108 if (!name)
1109 return false;
1110
1111 name += 1;
1112
1113 if (!strcmp(name, "kallsyms")) {
1114 strcpy(name, base_name);
1115 return true;
1116 }
1117
1118 return false;
1119 }
1120
1121 static int validate_kcore_modules(const char *kallsyms_filename,
1122 struct map *map)
1123 {
1124 struct map_groups *kmaps = map__kmaps(map);
1125 char modules_filename[PATH_MAX];
1126
1127 if (!kmaps)
1128 return -EINVAL;
1129
1130 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1131 kallsyms_filename))
1132 return -EINVAL;
1133
1134 if (do_validate_kcore_modules(modules_filename, kmaps))
1135 return -EINVAL;
1136
1137 return 0;
1138 }
1139
1140 static int validate_kcore_addresses(const char *kallsyms_filename,
1141 struct map *map)
1142 {
1143 struct kmap *kmap = map__kmap(map);
1144
1145 if (!kmap)
1146 return -EINVAL;
1147
1148 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1149 u64 start;
1150
1151 if (kallsyms__get_function_start(kallsyms_filename,
1152 kmap->ref_reloc_sym->name, &start))
1153 return -ENOENT;
1154 if (start != kmap->ref_reloc_sym->addr)
1155 return -EINVAL;
1156 }
1157
1158 return validate_kcore_modules(kallsyms_filename, map);
1159 }
1160
1161 struct kcore_mapfn_data {
1162 struct dso *dso;
1163 struct list_head maps;
1164 };
1165
1166 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1167 {
1168 struct kcore_mapfn_data *md = data;
1169 struct map *map;
1170
1171 map = map__new2(start, md->dso);
1172 if (map == NULL)
1173 return -ENOMEM;
1174
1175 map->end = map->start + len;
1176 map->pgoff = pgoff;
1177
1178 list_add(&map->node, &md->maps);
1179
1180 return 0;
1181 }
1182
1183 /*
1184 * Merges map into map_groups by splitting the new map
1185 * within the existing map regions.
1186 */
1187 int map_groups__merge_in(struct map_groups *kmaps, struct map *new_map)
1188 {
1189 struct map *old_map;
1190 LIST_HEAD(merged);
1191
1192 for (old_map = map_groups__first(kmaps); old_map;
1193 old_map = map_groups__next(old_map)) {
1194
1195 /* no overload with this one */
1196 if (new_map->end < old_map->start ||
1197 new_map->start >= old_map->end)
1198 continue;
1199
1200 if (new_map->start < old_map->start) {
1201 /*
1202 * |new......
1203 * |old....
1204 */
1205 if (new_map->end < old_map->end) {
1206 /*
1207 * |new......| -> |new..|
1208 * |old....| -> |old....|
1209 */
1210 new_map->end = old_map->start;
1211 } else {
1212 /*
1213 * |new.............| -> |new..| |new..|
1214 * |old....| -> |old....|
1215 */
1216 struct map *m = map__clone(new_map);
1217
1218 if (!m)
1219 return -ENOMEM;
1220
1221 m->end = old_map->start;
1222 list_add_tail(&m->node, &merged);
1223 new_map->start = old_map->end;
1224 }
1225 } else {
1226 /*
1227 * |new......
1228 * |old....
1229 */
1230 if (new_map->end < old_map->end) {
1231 /*
1232 * |new..| -> x
1233 * |old.........| -> |old.........|
1234 */
1235 map__put(new_map);
1236 new_map = NULL;
1237 break;
1238 } else {
1239 /*
1240 * |new......| -> |new...|
1241 * |old....| -> |old....|
1242 */
1243 new_map->start = old_map->end;
1244 }
1245 }
1246 }
1247
1248 while (!list_empty(&merged)) {
1249 old_map = list_entry(merged.next, struct map, node);
1250 list_del_init(&old_map->node);
1251 map_groups__insert(kmaps, old_map);
1252 map__put(old_map);
1253 }
1254
1255 if (new_map) {
1256 map_groups__insert(kmaps, new_map);
1257 map__put(new_map);
1258 }
1259 return 0;
1260 }
1261
1262 static int dso__load_kcore(struct dso *dso, struct map *map,
1263 const char *kallsyms_filename)
1264 {
1265 struct map_groups *kmaps = map__kmaps(map);
1266 struct kcore_mapfn_data md;
1267 struct map *old_map, *new_map, *replacement_map = NULL;
1268 struct machine *machine;
1269 bool is_64_bit;
1270 int err, fd;
1271 char kcore_filename[PATH_MAX];
1272 u64 stext;
1273
1274 if (!kmaps)
1275 return -EINVAL;
1276
1277 machine = kmaps->machine;
1278
1279 /* This function requires that the map is the kernel map */
1280 if (!__map__is_kernel(map))
1281 return -EINVAL;
1282
1283 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1284 kallsyms_filename))
1285 return -EINVAL;
1286
1287 /* Modules and kernel must be present at their original addresses */
1288 if (validate_kcore_addresses(kallsyms_filename, map))
1289 return -EINVAL;
1290
1291 md.dso = dso;
1292 INIT_LIST_HEAD(&md.maps);
1293
1294 fd = open(kcore_filename, O_RDONLY);
1295 if (fd < 0) {
1296 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1297 kcore_filename);
1298 return -EINVAL;
1299 }
1300
1301 /* Read new maps into temporary lists */
1302 err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1303 &is_64_bit);
1304 if (err)
1305 goto out_err;
1306 dso->is_64_bit = is_64_bit;
1307
1308 if (list_empty(&md.maps)) {
1309 err = -EINVAL;
1310 goto out_err;
1311 }
1312
1313 /* Remove old maps */
1314 old_map = map_groups__first(kmaps);
1315 while (old_map) {
1316 struct map *next = map_groups__next(old_map);
1317
1318 /*
1319 * We need to preserve eBPF maps even if they are
1320 * covered by kcore, because we need to access
1321 * eBPF dso for source data.
1322 */
1323 if (old_map != map && !__map__is_bpf_prog(old_map))
1324 map_groups__remove(kmaps, old_map);
1325 old_map = next;
1326 }
1327 machine->trampolines_mapped = false;
1328
1329 /* Find the kernel map using the '_stext' symbol */
1330 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1331 list_for_each_entry(new_map, &md.maps, node) {
1332 if (stext >= new_map->start && stext < new_map->end) {
1333 replacement_map = new_map;
1334 break;
1335 }
1336 }
1337 }
1338
1339 if (!replacement_map)
1340 replacement_map = list_entry(md.maps.next, struct map, node);
1341
1342 /* Add new maps */
1343 while (!list_empty(&md.maps)) {
1344 new_map = list_entry(md.maps.next, struct map, node);
1345 list_del_init(&new_map->node);
1346 if (new_map == replacement_map) {
1347 map->start = new_map->start;
1348 map->end = new_map->end;
1349 map->pgoff = new_map->pgoff;
1350 map->map_ip = new_map->map_ip;
1351 map->unmap_ip = new_map->unmap_ip;
1352 /* Ensure maps are correctly ordered */
1353 map__get(map);
1354 map_groups__remove(kmaps, map);
1355 map_groups__insert(kmaps, map);
1356 map__put(map);
1357 map__put(new_map);
1358 } else {
1359 /*
1360 * Merge kcore map into existing maps,
1361 * and ensure that current maps (eBPF)
1362 * stay intact.
1363 */
1364 if (map_groups__merge_in(kmaps, new_map))
1365 goto out_err;
1366 }
1367 }
1368
1369 if (machine__is(machine, "x86_64")) {
1370 u64 addr;
1371
1372 /*
1373 * If one of the corresponding symbols is there, assume the
1374 * entry trampoline maps are too.
1375 */
1376 if (!kallsyms__get_function_start(kallsyms_filename,
1377 ENTRY_TRAMPOLINE_NAME,
1378 &addr))
1379 machine->trampolines_mapped = true;
1380 }
1381
1382 /*
1383 * Set the data type and long name so that kcore can be read via
1384 * dso__data_read_addr().
1385 */
1386 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1387 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1388 else
1389 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1390 dso__set_long_name(dso, strdup(kcore_filename), true);
1391
1392 close(fd);
1393
1394 if (map->prot & PROT_EXEC)
1395 pr_debug("Using %s for kernel object code\n", kcore_filename);
1396 else
1397 pr_debug("Using %s for kernel data\n", kcore_filename);
1398
1399 return 0;
1400
1401 out_err:
1402 while (!list_empty(&md.maps)) {
1403 map = list_entry(md.maps.next, struct map, node);
1404 list_del_init(&map->node);
1405 map__put(map);
1406 }
1407 close(fd);
1408 return -EINVAL;
1409 }
1410
1411 /*
1412 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1413 * delta based on the relocation reference symbol.
1414 */
1415 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1416 {
1417 u64 addr;
1418
1419 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1420 return 0;
1421
1422 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1423 return -1;
1424
1425 *delta = addr - kmap->ref_reloc_sym->addr;
1426 return 0;
1427 }
1428
1429 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1430 struct map *map, bool no_kcore)
1431 {
1432 struct kmap *kmap = map__kmap(map);
1433 u64 delta = 0;
1434
1435 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1436 return -1;
1437
1438 if (!kmap || !kmap->kmaps)
1439 return -1;
1440
1441 if (dso__load_all_kallsyms(dso, filename) < 0)
1442 return -1;
1443
1444 if (kallsyms__delta(kmap, filename, &delta))
1445 return -1;
1446
1447 symbols__fixup_end(&dso->symbols);
1448 symbols__fixup_duplicate(&dso->symbols);
1449
1450 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1451 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1452 else
1453 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1454
1455 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1456 return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
1457 else
1458 return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
1459 }
1460
1461 int dso__load_kallsyms(struct dso *dso, const char *filename,
1462 struct map *map)
1463 {
1464 return __dso__load_kallsyms(dso, filename, map, false);
1465 }
1466
1467 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1468 {
1469 char *line = NULL;
1470 size_t n;
1471 FILE *file;
1472 int nr_syms = 0;
1473
1474 file = fopen(map_path, "r");
1475 if (file == NULL)
1476 goto out_failure;
1477
1478 while (!feof(file)) {
1479 u64 start, size;
1480 struct symbol *sym;
1481 int line_len, len;
1482
1483 line_len = getline(&line, &n, file);
1484 if (line_len < 0)
1485 break;
1486
1487 if (!line)
1488 goto out_failure;
1489
1490 line[--line_len] = '\0'; /* \n */
1491
1492 len = hex2u64(line, &start);
1493
1494 len++;
1495 if (len + 2 >= line_len)
1496 continue;
1497
1498 len += hex2u64(line + len, &size);
1499
1500 len++;
1501 if (len + 2 >= line_len)
1502 continue;
1503
1504 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1505
1506 if (sym == NULL)
1507 goto out_delete_line;
1508
1509 symbols__insert(&dso->symbols, sym);
1510 nr_syms++;
1511 }
1512
1513 free(line);
1514 fclose(file);
1515
1516 return nr_syms;
1517
1518 out_delete_line:
1519 free(line);
1520 out_failure:
1521 return -1;
1522 }
1523
1524 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1525 enum dso_binary_type type)
1526 {
1527 switch (type) {
1528 case DSO_BINARY_TYPE__JAVA_JIT:
1529 case DSO_BINARY_TYPE__DEBUGLINK:
1530 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1531 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1532 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1533 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1534 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1535 return !kmod && dso->kernel == DSO_TYPE_USER;
1536
1537 case DSO_BINARY_TYPE__KALLSYMS:
1538 case DSO_BINARY_TYPE__VMLINUX:
1539 case DSO_BINARY_TYPE__KCORE:
1540 return dso->kernel == DSO_TYPE_KERNEL;
1541
1542 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1543 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1544 case DSO_BINARY_TYPE__GUEST_KCORE:
1545 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1546
1547 case DSO_BINARY_TYPE__GUEST_KMODULE:
1548 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1549 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1550 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1551 /*
1552 * kernel modules know their symtab type - it's set when
1553 * creating a module dso in machine__findnew_module_map().
1554 */
1555 return kmod && dso->symtab_type == type;
1556
1557 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1558 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1559 return true;
1560
1561 case DSO_BINARY_TYPE__BPF_PROG_INFO:
1562 case DSO_BINARY_TYPE__NOT_FOUND:
1563 default:
1564 return false;
1565 }
1566 }
1567
1568 /* Checks for the existence of the perf-<pid>.map file in two different
1569 * locations. First, if the process is a separate mount namespace, check in
1570 * that namespace using the pid of the innermost pid namespace. If's not in a
1571 * namespace, or the file can't be found there, try in the mount namespace of
1572 * the tracing process using our view of its pid.
1573 */
1574 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1575 struct nsinfo **nsip)
1576 {
1577 struct nscookie nsc;
1578 struct nsinfo *nsi;
1579 struct nsinfo *nnsi;
1580 int rc = -1;
1581
1582 nsi = *nsip;
1583
1584 if (nsi->need_setns) {
1585 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1586 nsinfo__mountns_enter(nsi, &nsc);
1587 rc = access(filebuf, R_OK);
1588 nsinfo__mountns_exit(&nsc);
1589 if (rc == 0)
1590 return rc;
1591 }
1592
1593 nnsi = nsinfo__copy(nsi);
1594 if (nnsi) {
1595 nsinfo__put(nsi);
1596
1597 nnsi->need_setns = false;
1598 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1599 *nsip = nnsi;
1600 rc = 0;
1601 }
1602
1603 return rc;
1604 }
1605
1606 int dso__load(struct dso *dso, struct map *map)
1607 {
1608 char *name;
1609 int ret = -1;
1610 u_int i;
1611 struct machine *machine;
1612 char *root_dir = (char *) "";
1613 int ss_pos = 0;
1614 struct symsrc ss_[2];
1615 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1616 bool kmod;
1617 bool perfmap;
1618 unsigned char build_id[BUILD_ID_SIZE];
1619 struct nscookie nsc;
1620 char newmapname[PATH_MAX];
1621 const char *map_path = dso->long_name;
1622
1623 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1624 if (perfmap) {
1625 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1626 sizeof(newmapname), &dso->nsinfo) == 0)) {
1627 map_path = newmapname;
1628 }
1629 }
1630
1631 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1632 pthread_mutex_lock(&dso->lock);
1633
1634 /* check again under the dso->lock */
1635 if (dso__loaded(dso)) {
1636 ret = 1;
1637 goto out;
1638 }
1639
1640 if (map->groups && map->groups->machine)
1641 machine = map->groups->machine;
1642 else
1643 machine = NULL;
1644
1645 if (dso->kernel) {
1646 if (dso->kernel == DSO_TYPE_KERNEL)
1647 ret = dso__load_kernel_sym(dso, map);
1648 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1649 ret = dso__load_guest_kernel_sym(dso, map);
1650
1651 if (machine__is(machine, "x86_64"))
1652 machine__map_x86_64_entry_trampolines(machine, dso);
1653 goto out;
1654 }
1655
1656 dso->adjust_symbols = 0;
1657
1658 if (perfmap) {
1659 ret = dso__load_perf_map(map_path, dso);
1660 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1661 DSO_BINARY_TYPE__NOT_FOUND;
1662 goto out;
1663 }
1664
1665 if (machine)
1666 root_dir = machine->root_dir;
1667
1668 name = malloc(PATH_MAX);
1669 if (!name)
1670 goto out;
1671
1672 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1673 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1674 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1675 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1676
1677
1678 /*
1679 * Read the build id if possible. This is required for
1680 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1681 */
1682 if (!dso->has_build_id &&
1683 is_regular_file(dso->long_name)) {
1684 __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1685 if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1686 dso__set_build_id(dso, build_id);
1687 }
1688
1689 /*
1690 * Iterate over candidate debug images.
1691 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1692 * and/or opd section) for processing.
1693 */
1694 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1695 struct symsrc *ss = &ss_[ss_pos];
1696 bool next_slot = false;
1697 bool is_reg;
1698 bool nsexit;
1699 int sirc = -1;
1700
1701 enum dso_binary_type symtab_type = binary_type_symtab[i];
1702
1703 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1704 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1705
1706 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1707 continue;
1708
1709 if (dso__read_binary_type_filename(dso, symtab_type,
1710 root_dir, name, PATH_MAX))
1711 continue;
1712
1713 if (nsexit)
1714 nsinfo__mountns_exit(&nsc);
1715
1716 is_reg = is_regular_file(name);
1717 if (is_reg)
1718 sirc = symsrc__init(ss, dso, name, symtab_type);
1719
1720 if (nsexit)
1721 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1722
1723 if (!is_reg || sirc < 0)
1724 continue;
1725
1726 if (!syms_ss && symsrc__has_symtab(ss)) {
1727 syms_ss = ss;
1728 next_slot = true;
1729 if (!dso->symsrc_filename)
1730 dso->symsrc_filename = strdup(name);
1731 }
1732
1733 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1734 runtime_ss = ss;
1735 next_slot = true;
1736 }
1737
1738 if (next_slot) {
1739 ss_pos++;
1740
1741 if (syms_ss && runtime_ss)
1742 break;
1743 } else {
1744 symsrc__destroy(ss);
1745 }
1746
1747 }
1748
1749 if (!runtime_ss && !syms_ss)
1750 goto out_free;
1751
1752 if (runtime_ss && !syms_ss) {
1753 syms_ss = runtime_ss;
1754 }
1755
1756 /* We'll have to hope for the best */
1757 if (!runtime_ss && syms_ss)
1758 runtime_ss = syms_ss;
1759
1760 if (syms_ss)
1761 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1762 else
1763 ret = -1;
1764
1765 if (ret > 0) {
1766 int nr_plt;
1767
1768 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1769 if (nr_plt > 0)
1770 ret += nr_plt;
1771 }
1772
1773 for (; ss_pos > 0; ss_pos--)
1774 symsrc__destroy(&ss_[ss_pos - 1]);
1775 out_free:
1776 free(name);
1777 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1778 ret = 0;
1779 out:
1780 dso__set_loaded(dso);
1781 pthread_mutex_unlock(&dso->lock);
1782 nsinfo__mountns_exit(&nsc);
1783
1784 return ret;
1785 }
1786
1787 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
1788 {
1789 struct maps *maps = &mg->maps;
1790 struct map *map;
1791 struct rb_node *node;
1792
1793 down_read(&maps->lock);
1794
1795 for (node = maps->names.rb_node; node; ) {
1796 int rc;
1797
1798 map = rb_entry(node, struct map, rb_node_name);
1799
1800 rc = strcmp(map->dso->short_name, name);
1801 if (rc < 0)
1802 node = node->rb_left;
1803 else if (rc > 0)
1804 node = node->rb_right;
1805 else
1806
1807 goto out_unlock;
1808 }
1809
1810 map = NULL;
1811
1812 out_unlock:
1813 up_read(&maps->lock);
1814 return map;
1815 }
1816
1817 int dso__load_vmlinux(struct dso *dso, struct map *map,
1818 const char *vmlinux, bool vmlinux_allocated)
1819 {
1820 int err = -1;
1821 struct symsrc ss;
1822 char symfs_vmlinux[PATH_MAX];
1823 enum dso_binary_type symtab_type;
1824
1825 if (vmlinux[0] == '/')
1826 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1827 else
1828 symbol__join_symfs(symfs_vmlinux, vmlinux);
1829
1830 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1831 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1832 else
1833 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1834
1835 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1836 return -1;
1837
1838 err = dso__load_sym(dso, map, &ss, &ss, 0);
1839 symsrc__destroy(&ss);
1840
1841 if (err > 0) {
1842 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1843 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1844 else
1845 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1846 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1847 dso__set_loaded(dso);
1848 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1849 }
1850
1851 return err;
1852 }
1853
1854 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1855 {
1856 int i, err = 0;
1857 char *filename = NULL;
1858
1859 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1860 vmlinux_path__nr_entries + 1);
1861
1862 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1863 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1864 if (err > 0)
1865 goto out;
1866 }
1867
1868 if (!symbol_conf.ignore_vmlinux_buildid)
1869 filename = dso__build_id_filename(dso, NULL, 0, false);
1870 if (filename != NULL) {
1871 err = dso__load_vmlinux(dso, map, filename, true);
1872 if (err > 0)
1873 goto out;
1874 free(filename);
1875 }
1876 out:
1877 return err;
1878 }
1879
1880 static bool visible_dir_filter(const char *name, struct dirent *d)
1881 {
1882 if (d->d_type != DT_DIR)
1883 return false;
1884 return lsdir_no_dot_filter(name, d);
1885 }
1886
1887 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1888 {
1889 char kallsyms_filename[PATH_MAX];
1890 int ret = -1;
1891 struct strlist *dirs;
1892 struct str_node *nd;
1893
1894 dirs = lsdir(dir, visible_dir_filter);
1895 if (!dirs)
1896 return -1;
1897
1898 strlist__for_each_entry(nd, dirs) {
1899 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1900 "%s/%s/kallsyms", dir, nd->s);
1901 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1902 strlcpy(dir, kallsyms_filename, dir_sz);
1903 ret = 0;
1904 break;
1905 }
1906 }
1907
1908 strlist__delete(dirs);
1909
1910 return ret;
1911 }
1912
1913 /*
1914 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1915 * since access(R_OK) only checks with real UID/GID but open() use effective
1916 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1917 */
1918 static bool filename__readable(const char *file)
1919 {
1920 int fd = open(file, O_RDONLY);
1921 if (fd < 0)
1922 return false;
1923 close(fd);
1924 return true;
1925 }
1926
1927 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1928 {
1929 u8 host_build_id[BUILD_ID_SIZE];
1930 char sbuild_id[SBUILD_ID_SIZE];
1931 bool is_host = false;
1932 char path[PATH_MAX];
1933
1934 if (!dso->has_build_id) {
1935 /*
1936 * Last resort, if we don't have a build-id and couldn't find
1937 * any vmlinux file, try the running kernel kallsyms table.
1938 */
1939 goto proc_kallsyms;
1940 }
1941
1942 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1943 sizeof(host_build_id)) == 0)
1944 is_host = dso__build_id_equal(dso, host_build_id);
1945
1946 /* Try a fast path for /proc/kallsyms if possible */
1947 if (is_host) {
1948 /*
1949 * Do not check the build-id cache, unless we know we cannot use
1950 * /proc/kcore or module maps don't match to /proc/kallsyms.
1951 * To check readability of /proc/kcore, do not use access(R_OK)
1952 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1953 * can't check it.
1954 */
1955 if (filename__readable("/proc/kcore") &&
1956 !validate_kcore_addresses("/proc/kallsyms", map))
1957 goto proc_kallsyms;
1958 }
1959
1960 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1961
1962 /* Find kallsyms in build-id cache with kcore */
1963 scnprintf(path, sizeof(path), "%s/%s/%s",
1964 buildid_dir, DSO__NAME_KCORE, sbuild_id);
1965
1966 if (!find_matching_kcore(map, path, sizeof(path)))
1967 return strdup(path);
1968
1969 /* Use current /proc/kallsyms if possible */
1970 if (is_host) {
1971 proc_kallsyms:
1972 return strdup("/proc/kallsyms");
1973 }
1974
1975 /* Finally, find a cache of kallsyms */
1976 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1977 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1978 sbuild_id);
1979 return NULL;
1980 }
1981
1982 return strdup(path);
1983 }
1984
1985 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1986 {
1987 int err;
1988 const char *kallsyms_filename = NULL;
1989 char *kallsyms_allocated_filename = NULL;
1990 /*
1991 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1992 * it and only it, reporting errors to the user if it cannot be used.
1993 *
1994 * For instance, try to analyse an ARM perf.data file _without_ a
1995 * build-id, or if the user specifies the wrong path to the right
1996 * vmlinux file, obviously we can't fallback to another vmlinux (a
1997 * x86_86 one, on the machine where analysis is being performed, say),
1998 * or worse, /proc/kallsyms.
1999 *
2000 * If the specified file _has_ a build-id and there is a build-id
2001 * section in the perf.data file, we will still do the expected
2002 * validation in dso__load_vmlinux and will bail out if they don't
2003 * match.
2004 */
2005 if (symbol_conf.kallsyms_name != NULL) {
2006 kallsyms_filename = symbol_conf.kallsyms_name;
2007 goto do_kallsyms;
2008 }
2009
2010 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2011 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2012 }
2013
2014 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2015 err = dso__load_vmlinux_path(dso, map);
2016 if (err > 0)
2017 return err;
2018 }
2019
2020 /* do not try local files if a symfs was given */
2021 if (symbol_conf.symfs[0] != 0)
2022 return -1;
2023
2024 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2025 if (!kallsyms_allocated_filename)
2026 return -1;
2027
2028 kallsyms_filename = kallsyms_allocated_filename;
2029
2030 do_kallsyms:
2031 err = dso__load_kallsyms(dso, kallsyms_filename, map);
2032 if (err > 0)
2033 pr_debug("Using %s for symbols\n", kallsyms_filename);
2034 free(kallsyms_allocated_filename);
2035
2036 if (err > 0 && !dso__is_kcore(dso)) {
2037 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2038 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2039 map__fixup_start(map);
2040 map__fixup_end(map);
2041 }
2042
2043 return err;
2044 }
2045
2046 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2047 {
2048 int err;
2049 const char *kallsyms_filename = NULL;
2050 struct machine *machine;
2051 char path[PATH_MAX];
2052
2053 if (!map->groups) {
2054 pr_debug("Guest kernel map hasn't the point to groups\n");
2055 return -1;
2056 }
2057 machine = map->groups->machine;
2058
2059 if (machine__is_default_guest(machine)) {
2060 /*
2061 * if the user specified a vmlinux filename, use it and only
2062 * it, reporting errors to the user if it cannot be used.
2063 * Or use file guest_kallsyms inputted by user on commandline
2064 */
2065 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2066 err = dso__load_vmlinux(dso, map,
2067 symbol_conf.default_guest_vmlinux_name,
2068 false);
2069 return err;
2070 }
2071
2072 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2073 if (!kallsyms_filename)
2074 return -1;
2075 } else {
2076 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2077 kallsyms_filename = path;
2078 }
2079
2080 err = dso__load_kallsyms(dso, kallsyms_filename, map);
2081 if (err > 0)
2082 pr_debug("Using %s for symbols\n", kallsyms_filename);
2083 if (err > 0 && !dso__is_kcore(dso)) {
2084 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2085 dso__set_long_name(dso, machine->mmap_name, false);
2086 map__fixup_start(map);
2087 map__fixup_end(map);
2088 }
2089
2090 return err;
2091 }
2092
2093 static void vmlinux_path__exit(void)
2094 {
2095 while (--vmlinux_path__nr_entries >= 0)
2096 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2097 vmlinux_path__nr_entries = 0;
2098
2099 zfree(&vmlinux_path);
2100 }
2101
2102 static const char * const vmlinux_paths[] = {
2103 "vmlinux",
2104 "/boot/vmlinux"
2105 };
2106
2107 static const char * const vmlinux_paths_upd[] = {
2108 "/boot/vmlinux-%s",
2109 "/usr/lib/debug/boot/vmlinux-%s",
2110 "/lib/modules/%s/build/vmlinux",
2111 "/usr/lib/debug/lib/modules/%s/vmlinux",
2112 "/usr/lib/debug/boot/vmlinux-%s.debug"
2113 };
2114
2115 static int vmlinux_path__add(const char *new_entry)
2116 {
2117 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2118 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2119 return -1;
2120 ++vmlinux_path__nr_entries;
2121
2122 return 0;
2123 }
2124
2125 static int vmlinux_path__init(struct perf_env *env)
2126 {
2127 struct utsname uts;
2128 char bf[PATH_MAX];
2129 char *kernel_version;
2130 unsigned int i;
2131
2132 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2133 ARRAY_SIZE(vmlinux_paths_upd)));
2134 if (vmlinux_path == NULL)
2135 return -1;
2136
2137 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2138 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2139 goto out_fail;
2140
2141 /* only try kernel version if no symfs was given */
2142 if (symbol_conf.symfs[0] != 0)
2143 return 0;
2144
2145 if (env) {
2146 kernel_version = env->os_release;
2147 } else {
2148 if (uname(&uts) < 0)
2149 goto out_fail;
2150
2151 kernel_version = uts.release;
2152 }
2153
2154 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2155 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2156 if (vmlinux_path__add(bf) < 0)
2157 goto out_fail;
2158 }
2159
2160 return 0;
2161
2162 out_fail:
2163 vmlinux_path__exit();
2164 return -1;
2165 }
2166
2167 int setup_list(struct strlist **list, const char *list_str,
2168 const char *list_name)
2169 {
2170 if (list_str == NULL)
2171 return 0;
2172
2173 *list = strlist__new(list_str, NULL);
2174 if (!*list) {
2175 pr_err("problems parsing %s list\n", list_name);
2176 return -1;
2177 }
2178
2179 symbol_conf.has_filter = true;
2180 return 0;
2181 }
2182
2183 int setup_intlist(struct intlist **list, const char *list_str,
2184 const char *list_name)
2185 {
2186 if (list_str == NULL)
2187 return 0;
2188
2189 *list = intlist__new(list_str);
2190 if (!*list) {
2191 pr_err("problems parsing %s list\n", list_name);
2192 return -1;
2193 }
2194 return 0;
2195 }
2196
2197 static bool symbol__read_kptr_restrict(void)
2198 {
2199 bool value = false;
2200 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2201
2202 if (fp != NULL) {
2203 char line[8];
2204
2205 if (fgets(line, sizeof(line), fp) != NULL)
2206 value = perf_cap__capable(CAP_SYSLOG) ?
2207 (atoi(line) >= 2) :
2208 (atoi(line) != 0);
2209
2210 fclose(fp);
2211 }
2212
2213 /* Per kernel/kallsyms.c:
2214 * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2215 */
2216 if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2217 value = true;
2218
2219 return value;
2220 }
2221
2222 int symbol__annotation_init(void)
2223 {
2224 if (symbol_conf.init_annotation)
2225 return 0;
2226
2227 if (symbol_conf.initialized) {
2228 pr_err("Annotation needs to be init before symbol__init()\n");
2229 return -1;
2230 }
2231
2232 symbol_conf.priv_size += sizeof(struct annotation);
2233 symbol_conf.init_annotation = true;
2234 return 0;
2235 }
2236
2237 int symbol__init(struct perf_env *env)
2238 {
2239 const char *symfs;
2240
2241 if (symbol_conf.initialized)
2242 return 0;
2243
2244 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2245
2246 symbol__elf_init();
2247
2248 if (symbol_conf.sort_by_name)
2249 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2250 sizeof(struct symbol));
2251
2252 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2253 return -1;
2254
2255 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2256 pr_err("'.' is the only non valid --field-separator argument\n");
2257 return -1;
2258 }
2259
2260 if (setup_list(&symbol_conf.dso_list,
2261 symbol_conf.dso_list_str, "dso") < 0)
2262 return -1;
2263
2264 if (setup_list(&symbol_conf.comm_list,
2265 symbol_conf.comm_list_str, "comm") < 0)
2266 goto out_free_dso_list;
2267
2268 if (setup_intlist(&symbol_conf.pid_list,
2269 symbol_conf.pid_list_str, "pid") < 0)
2270 goto out_free_comm_list;
2271
2272 if (setup_intlist(&symbol_conf.tid_list,
2273 symbol_conf.tid_list_str, "tid") < 0)
2274 goto out_free_pid_list;
2275
2276 if (setup_list(&symbol_conf.sym_list,
2277 symbol_conf.sym_list_str, "symbol") < 0)
2278 goto out_free_tid_list;
2279
2280 if (setup_list(&symbol_conf.bt_stop_list,
2281 symbol_conf.bt_stop_list_str, "symbol") < 0)
2282 goto out_free_sym_list;
2283
2284 /*
2285 * A path to symbols of "/" is identical to ""
2286 * reset here for simplicity.
2287 */
2288 symfs = realpath(symbol_conf.symfs, NULL);
2289 if (symfs == NULL)
2290 symfs = symbol_conf.symfs;
2291 if (strcmp(symfs, "/") == 0)
2292 symbol_conf.symfs = "";
2293 if (symfs != symbol_conf.symfs)
2294 free((void *)symfs);
2295
2296 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2297
2298 symbol_conf.initialized = true;
2299 return 0;
2300
2301 out_free_sym_list:
2302 strlist__delete(symbol_conf.sym_list);
2303 out_free_tid_list:
2304 intlist__delete(symbol_conf.tid_list);
2305 out_free_pid_list:
2306 intlist__delete(symbol_conf.pid_list);
2307 out_free_comm_list:
2308 strlist__delete(symbol_conf.comm_list);
2309 out_free_dso_list:
2310 strlist__delete(symbol_conf.dso_list);
2311 return -1;
2312 }
2313
2314 void symbol__exit(void)
2315 {
2316 if (!symbol_conf.initialized)
2317 return;
2318 strlist__delete(symbol_conf.bt_stop_list);
2319 strlist__delete(symbol_conf.sym_list);
2320 strlist__delete(symbol_conf.dso_list);
2321 strlist__delete(symbol_conf.comm_list);
2322 intlist__delete(symbol_conf.tid_list);
2323 intlist__delete(symbol_conf.pid_list);
2324 vmlinux_path__exit();
2325 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2326 symbol_conf.bt_stop_list = NULL;
2327 symbol_conf.initialized = false;
2328 }
2329
2330 int symbol__config_symfs(const struct option *opt __maybe_unused,
2331 const char *dir, int unset __maybe_unused)
2332 {
2333 char *bf = NULL;
2334 int ret;
2335
2336 symbol_conf.symfs = strdup(dir);
2337 if (symbol_conf.symfs == NULL)
2338 return -ENOMEM;
2339
2340 /* skip the locally configured cache if a symfs is given, and
2341 * config buildid dir to symfs/.debug
2342 */
2343 ret = asprintf(&bf, "%s/%s", dir, ".debug");
2344 if (ret < 0)
2345 return -ENOMEM;
2346
2347 set_buildid_dir(bf);
2348
2349 free(bf);
2350 return 0;
2351 }
2352
2353 struct mem_info *mem_info__get(struct mem_info *mi)
2354 {
2355 if (mi)
2356 refcount_inc(&mi->refcnt);
2357 return mi;
2358 }
2359
2360 void mem_info__put(struct mem_info *mi)
2361 {
2362 if (mi && refcount_dec_and_test(&mi->refcnt))
2363 free(mi);
2364 }
2365
2366 struct mem_info *mem_info__new(void)
2367 {
2368 struct mem_info *mi = zalloc(sizeof(*mi));
2369
2370 if (mi)
2371 refcount_set(&mi->refcnt, 1);
2372 return mi;
2373 }
2374
2375 struct block_info *block_info__get(struct block_info *bi)
2376 {
2377 if (bi)
2378 refcount_inc(&bi->refcnt);
2379 return bi;
2380 }
2381
2382 void block_info__put(struct block_info *bi)
2383 {
2384 if (bi && refcount_dec_and_test(&bi->refcnt))
2385 free(bi);
2386 }
2387
2388 struct block_info *block_info__new(void)
2389 {
2390 struct block_info *bi = zalloc(sizeof(*bi));
2391
2392 if (bi)
2393 refcount_set(&bi->refcnt, 1);
2394 return bi;
2395 }
Linux with added FPC-III support