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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / tools / perf / util / symbol.c
blob26bc6a0096ce568bd4e9e70fa910063f1633787b
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 maps__fixup_end(struct maps *maps)
243 {
244 struct map *prev = NULL, *curr;
245
246 down_write(&maps->lock);
247
248 maps__for_each_entry(maps, curr) {
249 if (prev != NULL && !prev->end)
250 prev->end = curr->start;
251
252 prev = curr;
253 }
254
255 /*
256 * We still haven't the actual symbols, so guess the
257 * last map final address.
258 */
259 if (curr && !curr->end)
260 curr->end = ~0ULL;
261
262 up_write(&maps->lock);
263 }
264
265 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
266 {
267 size_t namelen = strlen(name) + 1;
268 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
269 sizeof(*sym) + namelen));
270 if (sym == NULL)
271 return NULL;
272
273 if (symbol_conf.priv_size) {
274 if (symbol_conf.init_annotation) {
275 struct annotation *notes = (void *)sym;
276 pthread_mutex_init(&notes->lock, NULL);
277 }
278 sym = ((void *)sym) + symbol_conf.priv_size;
279 }
280
281 sym->start = start;
282 sym->end = len ? start + len : start;
283 sym->type = type;
284 sym->binding = binding;
285 sym->namelen = namelen - 1;
286
287 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
288 __func__, name, start, sym->end);
289 memcpy(sym->name, name, namelen);
290
291 return sym;
292 }
293
294 void symbol__delete(struct symbol *sym)
295 {
296 free(((void *)sym) - symbol_conf.priv_size);
297 }
298
299 void symbols__delete(struct rb_root_cached *symbols)
300 {
301 struct symbol *pos;
302 struct rb_node *next = rb_first_cached(symbols);
303
304 while (next) {
305 pos = rb_entry(next, struct symbol, rb_node);
306 next = rb_next(&pos->rb_node);
307 rb_erase_cached(&pos->rb_node, symbols);
308 symbol__delete(pos);
309 }
310 }
311
312 void __symbols__insert(struct rb_root_cached *symbols,
313 struct symbol *sym, bool kernel)
314 {
315 struct rb_node **p = &symbols->rb_root.rb_node;
316 struct rb_node *parent = NULL;
317 const u64 ip = sym->start;
318 struct symbol *s;
319 bool leftmost = true;
320
321 if (kernel) {
322 const char *name = sym->name;
323 /*
324 * ppc64 uses function descriptors and appends a '.' to the
325 * start of every instruction address. Remove it.
326 */
327 if (name[0] == '.')
328 name++;
329 sym->idle = symbol__is_idle(name);
330 }
331
332 while (*p != NULL) {
333 parent = *p;
334 s = rb_entry(parent, struct symbol, rb_node);
335 if (ip < s->start)
336 p = &(*p)->rb_left;
337 else {
338 p = &(*p)->rb_right;
339 leftmost = false;
340 }
341 }
342 rb_link_node(&sym->rb_node, parent, p);
343 rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
344 }
345
346 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
347 {
348 __symbols__insert(symbols, sym, false);
349 }
350
351 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
352 {
353 struct rb_node *n;
354
355 if (symbols == NULL)
356 return NULL;
357
358 n = symbols->rb_root.rb_node;
359
360 while (n) {
361 struct symbol *s = rb_entry(n, struct symbol, rb_node);
362
363 if (ip < s->start)
364 n = n->rb_left;
365 else if (ip > s->end || (ip == s->end && ip != s->start))
366 n = n->rb_right;
367 else
368 return s;
369 }
370
371 return NULL;
372 }
373
374 static struct symbol *symbols__first(struct rb_root_cached *symbols)
375 {
376 struct rb_node *n = rb_first_cached(symbols);
377
378 if (n)
379 return rb_entry(n, struct symbol, rb_node);
380
381 return NULL;
382 }
383
384 static struct symbol *symbols__last(struct rb_root_cached *symbols)
385 {
386 struct rb_node *n = rb_last(&symbols->rb_root);
387
388 if (n)
389 return rb_entry(n, struct symbol, rb_node);
390
391 return NULL;
392 }
393
394 static struct symbol *symbols__next(struct symbol *sym)
395 {
396 struct rb_node *n = rb_next(&sym->rb_node);
397
398 if (n)
399 return rb_entry(n, struct symbol, rb_node);
400
401 return NULL;
402 }
403
404 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
405 {
406 struct rb_node **p = &symbols->rb_root.rb_node;
407 struct rb_node *parent = NULL;
408 struct symbol_name_rb_node *symn, *s;
409 bool leftmost = true;
410
411 symn = container_of(sym, struct symbol_name_rb_node, sym);
412
413 while (*p != NULL) {
414 parent = *p;
415 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
416 if (strcmp(sym->name, s->sym.name) < 0)
417 p = &(*p)->rb_left;
418 else {
419 p = &(*p)->rb_right;
420 leftmost = false;
421 }
422 }
423 rb_link_node(&symn->rb_node, parent, p);
424 rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
425 }
426
427 static void symbols__sort_by_name(struct rb_root_cached *symbols,
428 struct rb_root_cached *source)
429 {
430 struct rb_node *nd;
431
432 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
433 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
434 symbols__insert_by_name(symbols, pos);
435 }
436 }
437
438 int symbol__match_symbol_name(const char *name, const char *str,
439 enum symbol_tag_include includes)
440 {
441 const char *versioning;
442
443 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
444 (versioning = strstr(name, "@@"))) {
445 int len = strlen(str);
446
447 if (len < versioning - name)
448 len = versioning - name;
449
450 return arch__compare_symbol_names_n(name, str, len);
451 } else
452 return arch__compare_symbol_names(name, str);
453 }
454
455 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
456 const char *name,
457 enum symbol_tag_include includes)
458 {
459 struct rb_node *n;
460 struct symbol_name_rb_node *s = NULL;
461
462 if (symbols == NULL)
463 return NULL;
464
465 n = symbols->rb_root.rb_node;
466
467 while (n) {
468 int cmp;
469
470 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
471 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
472
473 if (cmp > 0)
474 n = n->rb_left;
475 else if (cmp < 0)
476 n = n->rb_right;
477 else
478 break;
479 }
480
481 if (n == NULL)
482 return NULL;
483
484 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
485 /* return first symbol that has same name (if any) */
486 for (n = rb_prev(n); n; n = rb_prev(n)) {
487 struct symbol_name_rb_node *tmp;
488
489 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
490 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
491 break;
492
493 s = tmp;
494 }
495
496 return &s->sym;
497 }
498
499 void dso__reset_find_symbol_cache(struct dso *dso)
500 {
501 dso->last_find_result.addr = 0;
502 dso->last_find_result.symbol = NULL;
503 }
504
505 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
506 {
507 __symbols__insert(&dso->symbols, sym, dso->kernel);
508
509 /* update the symbol cache if necessary */
510 if (dso->last_find_result.addr >= sym->start &&
511 (dso->last_find_result.addr < sym->end ||
512 sym->start == sym->end)) {
513 dso->last_find_result.symbol = sym;
514 }
515 }
516
517 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
518 {
519 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
520 dso->last_find_result.addr = addr;
521 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
522 }
523
524 return dso->last_find_result.symbol;
525 }
526
527 struct symbol *dso__first_symbol(struct dso *dso)
528 {
529 return symbols__first(&dso->symbols);
530 }
531
532 struct symbol *dso__last_symbol(struct dso *dso)
533 {
534 return symbols__last(&dso->symbols);
535 }
536
537 struct symbol *dso__next_symbol(struct symbol *sym)
538 {
539 return symbols__next(sym);
540 }
541
542 struct symbol *symbol__next_by_name(struct symbol *sym)
543 {
544 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
545 struct rb_node *n = rb_next(&s->rb_node);
546
547 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
548 }
549
550 /*
551 * Returns first symbol that matched with @name.
552 */
553 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
554 {
555 struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
556 SYMBOL_TAG_INCLUDE__NONE);
557 if (!s)
558 s = symbols__find_by_name(&dso->symbol_names, name,
559 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
560 return s;
561 }
562
563 void dso__sort_by_name(struct dso *dso)
564 {
565 dso__set_sorted_by_name(dso);
566 return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
567 }
568
569 int modules__parse(const char *filename, void *arg,
570 int (*process_module)(void *arg, const char *name,
571 u64 start, u64 size))
572 {
573 char *line = NULL;
574 size_t n;
575 FILE *file;
576 int err = 0;
577
578 file = fopen(filename, "r");
579 if (file == NULL)
580 return -1;
581
582 while (1) {
583 char name[PATH_MAX];
584 u64 start, size;
585 char *sep, *endptr;
586 ssize_t line_len;
587
588 line_len = getline(&line, &n, file);
589 if (line_len < 0) {
590 if (feof(file))
591 break;
592 err = -1;
593 goto out;
594 }
595
596 if (!line) {
597 err = -1;
598 goto out;
599 }
600
601 line[--line_len] = '\0'; /* \n */
602
603 sep = strrchr(line, 'x');
604 if (sep == NULL)
605 continue;
606
607 hex2u64(sep + 1, &start);
608
609 sep = strchr(line, ' ');
610 if (sep == NULL)
611 continue;
612
613 *sep = '\0';
614
615 scnprintf(name, sizeof(name), "[%s]", line);
616
617 size = strtoul(sep + 1, &endptr, 0);
618 if (*endptr != ' ' && *endptr != '\t')
619 continue;
620
621 err = process_module(arg, name, start, size);
622 if (err)
623 break;
624 }
625 out:
626 free(line);
627 fclose(file);
628 return err;
629 }
630
631 /*
632 * These are symbols in the kernel image, so make sure that
633 * sym is from a kernel DSO.
634 */
635 static bool symbol__is_idle(const char *name)
636 {
637 const char * const idle_symbols[] = {
638 "acpi_idle_do_entry",
639 "acpi_processor_ffh_cstate_enter",
640 "arch_cpu_idle",
641 "cpu_idle",
642 "cpu_startup_entry",
643 "idle_cpu",
644 "intel_idle",
645 "default_idle",
646 "native_safe_halt",
647 "enter_idle",
648 "exit_idle",
649 "mwait_idle",
650 "mwait_idle_with_hints",
651 "poll_idle",
652 "ppc64_runlatch_off",
653 "pseries_dedicated_idle_sleep",
654 NULL
655 };
656 int i;
657 static struct strlist *idle_symbols_list;
658
659 if (idle_symbols_list)
660 return strlist__has_entry(idle_symbols_list, name);
661
662 idle_symbols_list = strlist__new(NULL, NULL);
663
664 for (i = 0; idle_symbols[i]; i++)
665 strlist__add(idle_symbols_list, idle_symbols[i]);
666
667 return strlist__has_entry(idle_symbols_list, name);
668 }
669
670 static int map__process_kallsym_symbol(void *arg, const char *name,
671 char type, u64 start)
672 {
673 struct symbol *sym;
674 struct dso *dso = arg;
675 struct rb_root_cached *root = &dso->symbols;
676
677 if (!symbol_type__filter(type))
678 return 0;
679
680 /*
681 * module symbols are not sorted so we add all
682 * symbols, setting length to 0, and rely on
683 * symbols__fixup_end() to fix it up.
684 */
685 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
686 if (sym == NULL)
687 return -ENOMEM;
688 /*
689 * We will pass the symbols to the filter later, in
690 * map__split_kallsyms, when we have split the maps per module
691 */
692 __symbols__insert(root, sym, !strchr(name, '['));
693
694 return 0;
695 }
696
697 /*
698 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
699 * so that we can in the next step set the symbol ->end address and then
700 * call kernel_maps__split_kallsyms.
701 */
702 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
703 {
704 return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
705 }
706
707 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
708 {
709 struct map *curr_map;
710 struct symbol *pos;
711 int count = 0;
712 struct rb_root_cached old_root = dso->symbols;
713 struct rb_root_cached *root = &dso->symbols;
714 struct rb_node *next = rb_first_cached(root);
715
716 if (!kmaps)
717 return -1;
718
719 *root = RB_ROOT_CACHED;
720
721 while (next) {
722 char *module;
723
724 pos = rb_entry(next, struct symbol, rb_node);
725 next = rb_next(&pos->rb_node);
726
727 rb_erase_cached(&pos->rb_node, &old_root);
728 RB_CLEAR_NODE(&pos->rb_node);
729 module = strchr(pos->name, '\t');
730 if (module)
731 *module = '\0';
732
733 curr_map = maps__find(kmaps, pos->start);
734
735 if (!curr_map) {
736 symbol__delete(pos);
737 continue;
738 }
739
740 pos->start -= curr_map->start - curr_map->pgoff;
741 if (pos->end > curr_map->end)
742 pos->end = curr_map->end;
743 if (pos->end)
744 pos->end -= curr_map->start - curr_map->pgoff;
745 symbols__insert(&curr_map->dso->symbols, pos);
746 ++count;
747 }
748
749 /* Symbols have been adjusted */
750 dso->adjust_symbols = 1;
751
752 return count;
753 }
754
755 /*
756 * Split the symbols into maps, making sure there are no overlaps, i.e. the
757 * kernel range is broken in several maps, named [kernel].N, as we don't have
758 * the original ELF section names vmlinux have.
759 */
760 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
761 struct map *initial_map)
762 {
763 struct machine *machine;
764 struct map *curr_map = initial_map;
765 struct symbol *pos;
766 int count = 0, moved = 0;
767 struct rb_root_cached *root = &dso->symbols;
768 struct rb_node *next = rb_first_cached(root);
769 int kernel_range = 0;
770 bool x86_64;
771
772 if (!kmaps)
773 return -1;
774
775 machine = kmaps->machine;
776
777 x86_64 = machine__is(machine, "x86_64");
778
779 while (next) {
780 char *module;
781
782 pos = rb_entry(next, struct symbol, rb_node);
783 next = rb_next(&pos->rb_node);
784
785 module = strchr(pos->name, '\t');
786 if (module) {
787 if (!symbol_conf.use_modules)
788 goto discard_symbol;
789
790 *module++ = '\0';
791
792 if (strcmp(curr_map->dso->short_name, module)) {
793 if (curr_map != initial_map &&
794 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
795 machine__is_default_guest(machine)) {
796 /*
797 * We assume all symbols of a module are
798 * continuous in * kallsyms, so curr_map
799 * points to a module and all its
800 * symbols are in its kmap. Mark it as
801 * loaded.
802 */
803 dso__set_loaded(curr_map->dso);
804 }
805
806 curr_map = maps__find_by_name(kmaps, module);
807 if (curr_map == NULL) {
808 pr_debug("%s/proc/{kallsyms,modules} "
809 "inconsistency while looking "
810 "for \"%s\" module!\n",
811 machine->root_dir, module);
812 curr_map = initial_map;
813 goto discard_symbol;
814 }
815
816 if (curr_map->dso->loaded &&
817 !machine__is_default_guest(machine))
818 goto discard_symbol;
819 }
820 /*
821 * So that we look just like we get from .ko files,
822 * i.e. not prelinked, relative to initial_map->start.
823 */
824 pos->start = curr_map->map_ip(curr_map, pos->start);
825 pos->end = curr_map->map_ip(curr_map, pos->end);
826 } else if (x86_64 && is_entry_trampoline(pos->name)) {
827 /*
828 * These symbols are not needed anymore since the
829 * trampoline maps refer to the text section and it's
830 * symbols instead. Avoid having to deal with
831 * relocations, and the assumption that the first symbol
832 * is the start of kernel text, by simply removing the
833 * symbols at this point.
834 */
835 goto discard_symbol;
836 } else if (curr_map != initial_map) {
837 char dso_name[PATH_MAX];
838 struct dso *ndso;
839
840 if (delta) {
841 /* Kernel was relocated at boot time */
842 pos->start -= delta;
843 pos->end -= delta;
844 }
845
846 if (count == 0) {
847 curr_map = initial_map;
848 goto add_symbol;
849 }
850
851 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
852 snprintf(dso_name, sizeof(dso_name),
853 "[guest.kernel].%d",
854 kernel_range++);
855 else
856 snprintf(dso_name, sizeof(dso_name),
857 "[kernel].%d",
858 kernel_range++);
859
860 ndso = dso__new(dso_name);
861 if (ndso == NULL)
862 return -1;
863
864 ndso->kernel = dso->kernel;
865
866 curr_map = map__new2(pos->start, ndso);
867 if (curr_map == NULL) {
868 dso__put(ndso);
869 return -1;
870 }
871
872 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
873 maps__insert(kmaps, curr_map);
874 ++kernel_range;
875 } else if (delta) {
876 /* Kernel was relocated at boot time */
877 pos->start -= delta;
878 pos->end -= delta;
879 }
880 add_symbol:
881 if (curr_map != initial_map) {
882 rb_erase_cached(&pos->rb_node, root);
883 symbols__insert(&curr_map->dso->symbols, pos);
884 ++moved;
885 } else
886 ++count;
887
888 continue;
889 discard_symbol:
890 rb_erase_cached(&pos->rb_node, root);
891 symbol__delete(pos);
892 }
893
894 if (curr_map != initial_map &&
895 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
896 machine__is_default_guest(kmaps->machine)) {
897 dso__set_loaded(curr_map->dso);
898 }
899
900 return count + moved;
901 }
902
903 bool symbol__restricted_filename(const char *filename,
904 const char *restricted_filename)
905 {
906 bool restricted = false;
907
908 if (symbol_conf.kptr_restrict) {
909 char *r = realpath(filename, NULL);
910
911 if (r != NULL) {
912 restricted = strcmp(r, restricted_filename) == 0;
913 free(r);
914 return restricted;
915 }
916 }
917
918 return restricted;
919 }
920
921 struct module_info {
922 struct rb_node rb_node;
923 char *name;
924 u64 start;
925 };
926
927 static void add_module(struct module_info *mi, struct rb_root *modules)
928 {
929 struct rb_node **p = &modules->rb_node;
930 struct rb_node *parent = NULL;
931 struct module_info *m;
932
933 while (*p != NULL) {
934 parent = *p;
935 m = rb_entry(parent, struct module_info, rb_node);
936 if (strcmp(mi->name, m->name) < 0)
937 p = &(*p)->rb_left;
938 else
939 p = &(*p)->rb_right;
940 }
941 rb_link_node(&mi->rb_node, parent, p);
942 rb_insert_color(&mi->rb_node, modules);
943 }
944
945 static void delete_modules(struct rb_root *modules)
946 {
947 struct module_info *mi;
948 struct rb_node *next = rb_first(modules);
949
950 while (next) {
951 mi = rb_entry(next, struct module_info, rb_node);
952 next = rb_next(&mi->rb_node);
953 rb_erase(&mi->rb_node, modules);
954 zfree(&mi->name);
955 free(mi);
956 }
957 }
958
959 static struct module_info *find_module(const char *name,
960 struct rb_root *modules)
961 {
962 struct rb_node *n = modules->rb_node;
963
964 while (n) {
965 struct module_info *m;
966 int cmp;
967
968 m = rb_entry(n, struct module_info, rb_node);
969 cmp = strcmp(name, m->name);
970 if (cmp < 0)
971 n = n->rb_left;
972 else if (cmp > 0)
973 n = n->rb_right;
974 else
975 return m;
976 }
977
978 return NULL;
979 }
980
981 static int __read_proc_modules(void *arg, const char *name, u64 start,
982 u64 size __maybe_unused)
983 {
984 struct rb_root *modules = arg;
985 struct module_info *mi;
986
987 mi = zalloc(sizeof(struct module_info));
988 if (!mi)
989 return -ENOMEM;
990
991 mi->name = strdup(name);
992 mi->start = start;
993
994 if (!mi->name) {
995 free(mi);
996 return -ENOMEM;
997 }
998
999 add_module(mi, modules);
1000
1001 return 0;
1002 }
1003
1004 static int read_proc_modules(const char *filename, struct rb_root *modules)
1005 {
1006 if (symbol__restricted_filename(filename, "/proc/modules"))
1007 return -1;
1008
1009 if (modules__parse(filename, modules, __read_proc_modules)) {
1010 delete_modules(modules);
1011 return -1;
1012 }
1013
1014 return 0;
1015 }
1016
1017 int compare_proc_modules(const char *from, const char *to)
1018 {
1019 struct rb_root from_modules = RB_ROOT;
1020 struct rb_root to_modules = RB_ROOT;
1021 struct rb_node *from_node, *to_node;
1022 struct module_info *from_m, *to_m;
1023 int ret = -1;
1024
1025 if (read_proc_modules(from, &from_modules))
1026 return -1;
1027
1028 if (read_proc_modules(to, &to_modules))
1029 goto out_delete_from;
1030
1031 from_node = rb_first(&from_modules);
1032 to_node = rb_first(&to_modules);
1033 while (from_node) {
1034 if (!to_node)
1035 break;
1036
1037 from_m = rb_entry(from_node, struct module_info, rb_node);
1038 to_m = rb_entry(to_node, struct module_info, rb_node);
1039
1040 if (from_m->start != to_m->start ||
1041 strcmp(from_m->name, to_m->name))
1042 break;
1043
1044 from_node = rb_next(from_node);
1045 to_node = rb_next(to_node);
1046 }
1047
1048 if (!from_node && !to_node)
1049 ret = 0;
1050
1051 delete_modules(&to_modules);
1052 out_delete_from:
1053 delete_modules(&from_modules);
1054
1055 return ret;
1056 }
1057
1058 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1059 {
1060 struct rb_root modules = RB_ROOT;
1061 struct map *old_map;
1062 int err;
1063
1064 err = read_proc_modules(filename, &modules);
1065 if (err)
1066 return err;
1067
1068 maps__for_each_entry(kmaps, old_map) {
1069 struct module_info *mi;
1070
1071 if (!__map__is_kmodule(old_map)) {
1072 continue;
1073 }
1074
1075 /* Module must be in memory at the same address */
1076 mi = find_module(old_map->dso->short_name, &modules);
1077 if (!mi || mi->start != old_map->start) {
1078 err = -EINVAL;
1079 goto out;
1080 }
1081 }
1082 out:
1083 delete_modules(&modules);
1084 return err;
1085 }
1086
1087 /*
1088 * If kallsyms is referenced by name then we look for filename in the same
1089 * directory.
1090 */
1091 static bool filename_from_kallsyms_filename(char *filename,
1092 const char *base_name,
1093 const char *kallsyms_filename)
1094 {
1095 char *name;
1096
1097 strcpy(filename, kallsyms_filename);
1098 name = strrchr(filename, '/');
1099 if (!name)
1100 return false;
1101
1102 name += 1;
1103
1104 if (!strcmp(name, "kallsyms")) {
1105 strcpy(name, base_name);
1106 return true;
1107 }
1108
1109 return false;
1110 }
1111
1112 static int validate_kcore_modules(const char *kallsyms_filename,
1113 struct map *map)
1114 {
1115 struct maps *kmaps = map__kmaps(map);
1116 char modules_filename[PATH_MAX];
1117
1118 if (!kmaps)
1119 return -EINVAL;
1120
1121 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1122 kallsyms_filename))
1123 return -EINVAL;
1124
1125 if (do_validate_kcore_modules(modules_filename, kmaps))
1126 return -EINVAL;
1127
1128 return 0;
1129 }
1130
1131 static int validate_kcore_addresses(const char *kallsyms_filename,
1132 struct map *map)
1133 {
1134 struct kmap *kmap = map__kmap(map);
1135
1136 if (!kmap)
1137 return -EINVAL;
1138
1139 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1140 u64 start;
1141
1142 if (kallsyms__get_function_start(kallsyms_filename,
1143 kmap->ref_reloc_sym->name, &start))
1144 return -ENOENT;
1145 if (start != kmap->ref_reloc_sym->addr)
1146 return -EINVAL;
1147 }
1148
1149 return validate_kcore_modules(kallsyms_filename, map);
1150 }
1151
1152 struct kcore_mapfn_data {
1153 struct dso *dso;
1154 struct list_head maps;
1155 };
1156
1157 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1158 {
1159 struct kcore_mapfn_data *md = data;
1160 struct map *map;
1161
1162 map = map__new2(start, md->dso);
1163 if (map == NULL)
1164 return -ENOMEM;
1165
1166 map->end = map->start + len;
1167 map->pgoff = pgoff;
1168
1169 list_add(&map->node, &md->maps);
1170
1171 return 0;
1172 }
1173
1174 /*
1175 * Merges map into maps by splitting the new map within the existing map
1176 * regions.
1177 */
1178 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1179 {
1180 struct map *old_map;
1181 LIST_HEAD(merged);
1182
1183 maps__for_each_entry(kmaps, old_map) {
1184 /* no overload with this one */
1185 if (new_map->end < old_map->start ||
1186 new_map->start >= old_map->end)
1187 continue;
1188
1189 if (new_map->start < old_map->start) {
1190 /*
1191 * |new......
1192 * |old....
1193 */
1194 if (new_map->end < old_map->end) {
1195 /*
1196 * |new......| -> |new..|
1197 * |old....| -> |old....|
1198 */
1199 new_map->end = old_map->start;
1200 } else {
1201 /*
1202 * |new.............| -> |new..| |new..|
1203 * |old....| -> |old....|
1204 */
1205 struct map *m = map__clone(new_map);
1206
1207 if (!m)
1208 return -ENOMEM;
1209
1210 m->end = old_map->start;
1211 list_add_tail(&m->node, &merged);
1212 new_map->start = old_map->end;
1213 }
1214 } else {
1215 /*
1216 * |new......
1217 * |old....
1218 */
1219 if (new_map->end < old_map->end) {
1220 /*
1221 * |new..| -> x
1222 * |old.........| -> |old.........|
1223 */
1224 map__put(new_map);
1225 new_map = NULL;
1226 break;
1227 } else {
1228 /*
1229 * |new......| -> |new...|
1230 * |old....| -> |old....|
1231 */
1232 new_map->start = old_map->end;
1233 }
1234 }
1235 }
1236
1237 while (!list_empty(&merged)) {
1238 old_map = list_entry(merged.next, struct map, node);
1239 list_del_init(&old_map->node);
1240 maps__insert(kmaps, old_map);
1241 map__put(old_map);
1242 }
1243
1244 if (new_map) {
1245 maps__insert(kmaps, new_map);
1246 map__put(new_map);
1247 }
1248 return 0;
1249 }
1250
1251 static int dso__load_kcore(struct dso *dso, struct map *map,
1252 const char *kallsyms_filename)
1253 {
1254 struct maps *kmaps = map__kmaps(map);
1255 struct kcore_mapfn_data md;
1256 struct map *old_map, *new_map, *replacement_map = NULL, *next;
1257 struct machine *machine;
1258 bool is_64_bit;
1259 int err, fd;
1260 char kcore_filename[PATH_MAX];
1261 u64 stext;
1262
1263 if (!kmaps)
1264 return -EINVAL;
1265
1266 machine = kmaps->machine;
1267
1268 /* This function requires that the map is the kernel map */
1269 if (!__map__is_kernel(map))
1270 return -EINVAL;
1271
1272 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1273 kallsyms_filename))
1274 return -EINVAL;
1275
1276 /* Modules and kernel must be present at their original addresses */
1277 if (validate_kcore_addresses(kallsyms_filename, map))
1278 return -EINVAL;
1279
1280 md.dso = dso;
1281 INIT_LIST_HEAD(&md.maps);
1282
1283 fd = open(kcore_filename, O_RDONLY);
1284 if (fd < 0) {
1285 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1286 kcore_filename);
1287 return -EINVAL;
1288 }
1289
1290 /* Read new maps into temporary lists */
1291 err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1292 &is_64_bit);
1293 if (err)
1294 goto out_err;
1295 dso->is_64_bit = is_64_bit;
1296
1297 if (list_empty(&md.maps)) {
1298 err = -EINVAL;
1299 goto out_err;
1300 }
1301
1302 /* Remove old maps */
1303 maps__for_each_entry_safe(kmaps, old_map, next) {
1304 /*
1305 * We need to preserve eBPF maps even if they are
1306 * covered by kcore, because we need to access
1307 * eBPF dso for source data.
1308 */
1309 if (old_map != map && !__map__is_bpf_prog(old_map))
1310 maps__remove(kmaps, old_map);
1311 }
1312 machine->trampolines_mapped = false;
1313
1314 /* Find the kernel map using the '_stext' symbol */
1315 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1316 list_for_each_entry(new_map, &md.maps, node) {
1317 if (stext >= new_map->start && stext < new_map->end) {
1318 replacement_map = new_map;
1319 break;
1320 }
1321 }
1322 }
1323
1324 if (!replacement_map)
1325 replacement_map = list_entry(md.maps.next, struct map, node);
1326
1327 /* Add new maps */
1328 while (!list_empty(&md.maps)) {
1329 new_map = list_entry(md.maps.next, struct map, node);
1330 list_del_init(&new_map->node);
1331 if (new_map == replacement_map) {
1332 map->start = new_map->start;
1333 map->end = new_map->end;
1334 map->pgoff = new_map->pgoff;
1335 map->map_ip = new_map->map_ip;
1336 map->unmap_ip = new_map->unmap_ip;
1337 /* Ensure maps are correctly ordered */
1338 map__get(map);
1339 maps__remove(kmaps, map);
1340 maps__insert(kmaps, map);
1341 map__put(map);
1342 map__put(new_map);
1343 } else {
1344 /*
1345 * Merge kcore map into existing maps,
1346 * and ensure that current maps (eBPF)
1347 * stay intact.
1348 */
1349 if (maps__merge_in(kmaps, new_map))
1350 goto out_err;
1351 }
1352 }
1353
1354 if (machine__is(machine, "x86_64")) {
1355 u64 addr;
1356
1357 /*
1358 * If one of the corresponding symbols is there, assume the
1359 * entry trampoline maps are too.
1360 */
1361 if (!kallsyms__get_function_start(kallsyms_filename,
1362 ENTRY_TRAMPOLINE_NAME,
1363 &addr))
1364 machine->trampolines_mapped = true;
1365 }
1366
1367 /*
1368 * Set the data type and long name so that kcore can be read via
1369 * dso__data_read_addr().
1370 */
1371 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1372 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1373 else
1374 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1375 dso__set_long_name(dso, strdup(kcore_filename), true);
1376
1377 close(fd);
1378
1379 if (map->prot & PROT_EXEC)
1380 pr_debug("Using %s for kernel object code\n", kcore_filename);
1381 else
1382 pr_debug("Using %s for kernel data\n", kcore_filename);
1383
1384 return 0;
1385
1386 out_err:
1387 while (!list_empty(&md.maps)) {
1388 map = list_entry(md.maps.next, struct map, node);
1389 list_del_init(&map->node);
1390 map__put(map);
1391 }
1392 close(fd);
1393 return -EINVAL;
1394 }
1395
1396 /*
1397 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1398 * delta based on the relocation reference symbol.
1399 */
1400 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1401 {
1402 u64 addr;
1403
1404 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1405 return 0;
1406
1407 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1408 return -1;
1409
1410 *delta = addr - kmap->ref_reloc_sym->addr;
1411 return 0;
1412 }
1413
1414 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1415 struct map *map, bool no_kcore)
1416 {
1417 struct kmap *kmap = map__kmap(map);
1418 u64 delta = 0;
1419
1420 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1421 return -1;
1422
1423 if (!kmap || !kmap->kmaps)
1424 return -1;
1425
1426 if (dso__load_all_kallsyms(dso, filename) < 0)
1427 return -1;
1428
1429 if (kallsyms__delta(kmap, filename, &delta))
1430 return -1;
1431
1432 symbols__fixup_end(&dso->symbols);
1433 symbols__fixup_duplicate(&dso->symbols);
1434
1435 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1436 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1437 else
1438 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1439
1440 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1441 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1442 else
1443 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1444 }
1445
1446 int dso__load_kallsyms(struct dso *dso, const char *filename,
1447 struct map *map)
1448 {
1449 return __dso__load_kallsyms(dso, filename, map, false);
1450 }
1451
1452 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1453 {
1454 char *line = NULL;
1455 size_t n;
1456 FILE *file;
1457 int nr_syms = 0;
1458
1459 file = fopen(map_path, "r");
1460 if (file == NULL)
1461 goto out_failure;
1462
1463 while (!feof(file)) {
1464 u64 start, size;
1465 struct symbol *sym;
1466 int line_len, len;
1467
1468 line_len = getline(&line, &n, file);
1469 if (line_len < 0)
1470 break;
1471
1472 if (!line)
1473 goto out_failure;
1474
1475 line[--line_len] = '\0'; /* \n */
1476
1477 len = hex2u64(line, &start);
1478
1479 len++;
1480 if (len + 2 >= line_len)
1481 continue;
1482
1483 len += hex2u64(line + len, &size);
1484
1485 len++;
1486 if (len + 2 >= line_len)
1487 continue;
1488
1489 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1490
1491 if (sym == NULL)
1492 goto out_delete_line;
1493
1494 symbols__insert(&dso->symbols, sym);
1495 nr_syms++;
1496 }
1497
1498 free(line);
1499 fclose(file);
1500
1501 return nr_syms;
1502
1503 out_delete_line:
1504 free(line);
1505 out_failure:
1506 return -1;
1507 }
1508
1509 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1510 enum dso_binary_type type)
1511 {
1512 switch (type) {
1513 case DSO_BINARY_TYPE__JAVA_JIT:
1514 case DSO_BINARY_TYPE__DEBUGLINK:
1515 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1516 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1517 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1518 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1519 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1520 return !kmod && dso->kernel == DSO_TYPE_USER;
1521
1522 case DSO_BINARY_TYPE__KALLSYMS:
1523 case DSO_BINARY_TYPE__VMLINUX:
1524 case DSO_BINARY_TYPE__KCORE:
1525 return dso->kernel == DSO_TYPE_KERNEL;
1526
1527 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1528 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1529 case DSO_BINARY_TYPE__GUEST_KCORE:
1530 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1531
1532 case DSO_BINARY_TYPE__GUEST_KMODULE:
1533 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1534 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1535 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1536 /*
1537 * kernel modules know their symtab type - it's set when
1538 * creating a module dso in machine__addnew_module_map().
1539 */
1540 return kmod && dso->symtab_type == type;
1541
1542 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1543 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1544 return true;
1545
1546 case DSO_BINARY_TYPE__BPF_PROG_INFO:
1547 case DSO_BINARY_TYPE__NOT_FOUND:
1548 default:
1549 return false;
1550 }
1551 }
1552
1553 /* Checks for the existence of the perf-<pid>.map file in two different
1554 * locations. First, if the process is a separate mount namespace, check in
1555 * that namespace using the pid of the innermost pid namespace. If's not in a
1556 * namespace, or the file can't be found there, try in the mount namespace of
1557 * the tracing process using our view of its pid.
1558 */
1559 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1560 struct nsinfo **nsip)
1561 {
1562 struct nscookie nsc;
1563 struct nsinfo *nsi;
1564 struct nsinfo *nnsi;
1565 int rc = -1;
1566
1567 nsi = *nsip;
1568
1569 if (nsi->need_setns) {
1570 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1571 nsinfo__mountns_enter(nsi, &nsc);
1572 rc = access(filebuf, R_OK);
1573 nsinfo__mountns_exit(&nsc);
1574 if (rc == 0)
1575 return rc;
1576 }
1577
1578 nnsi = nsinfo__copy(nsi);
1579 if (nnsi) {
1580 nsinfo__put(nsi);
1581
1582 nnsi->need_setns = false;
1583 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1584 *nsip = nnsi;
1585 rc = 0;
1586 }
1587
1588 return rc;
1589 }
1590
1591 int dso__load(struct dso *dso, struct map *map)
1592 {
1593 char *name;
1594 int ret = -1;
1595 u_int i;
1596 struct machine *machine = NULL;
1597 char *root_dir = (char *) "";
1598 int ss_pos = 0;
1599 struct symsrc ss_[2];
1600 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1601 bool kmod;
1602 bool perfmap;
1603 unsigned char build_id[BUILD_ID_SIZE];
1604 struct nscookie nsc;
1605 char newmapname[PATH_MAX];
1606 const char *map_path = dso->long_name;
1607
1608 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1609 if (perfmap) {
1610 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1611 sizeof(newmapname), &dso->nsinfo) == 0)) {
1612 map_path = newmapname;
1613 }
1614 }
1615
1616 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1617 pthread_mutex_lock(&dso->lock);
1618
1619 /* check again under the dso->lock */
1620 if (dso__loaded(dso)) {
1621 ret = 1;
1622 goto out;
1623 }
1624
1625 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1626 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1627 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1628 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1629
1630 if (dso->kernel && !kmod) {
1631 if (dso->kernel == DSO_TYPE_KERNEL)
1632 ret = dso__load_kernel_sym(dso, map);
1633 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1634 ret = dso__load_guest_kernel_sym(dso, map);
1635
1636 machine = map__kmaps(map)->machine;
1637 if (machine__is(machine, "x86_64"))
1638 machine__map_x86_64_entry_trampolines(machine, dso);
1639 goto out;
1640 }
1641
1642 dso->adjust_symbols = 0;
1643
1644 if (perfmap) {
1645 ret = dso__load_perf_map(map_path, dso);
1646 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1647 DSO_BINARY_TYPE__NOT_FOUND;
1648 goto out;
1649 }
1650
1651 if (machine)
1652 root_dir = machine->root_dir;
1653
1654 name = malloc(PATH_MAX);
1655 if (!name)
1656 goto out;
1657
1658 /*
1659 * Read the build id if possible. This is required for
1660 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1661 */
1662 if (!dso->has_build_id &&
1663 is_regular_file(dso->long_name)) {
1664 __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1665 if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1666 dso__set_build_id(dso, build_id);
1667 }
1668
1669 /*
1670 * Iterate over candidate debug images.
1671 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1672 * and/or opd section) for processing.
1673 */
1674 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1675 struct symsrc *ss = &ss_[ss_pos];
1676 bool next_slot = false;
1677 bool is_reg;
1678 bool nsexit;
1679 int sirc = -1;
1680
1681 enum dso_binary_type symtab_type = binary_type_symtab[i];
1682
1683 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1684 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1685
1686 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1687 continue;
1688
1689 if (dso__read_binary_type_filename(dso, symtab_type,
1690 root_dir, name, PATH_MAX))
1691 continue;
1692
1693 if (nsexit)
1694 nsinfo__mountns_exit(&nsc);
1695
1696 is_reg = is_regular_file(name);
1697 if (is_reg)
1698 sirc = symsrc__init(ss, dso, name, symtab_type);
1699
1700 if (nsexit)
1701 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1702
1703 if (!is_reg || sirc < 0)
1704 continue;
1705
1706 if (!syms_ss && symsrc__has_symtab(ss)) {
1707 syms_ss = ss;
1708 next_slot = true;
1709 if (!dso->symsrc_filename)
1710 dso->symsrc_filename = strdup(name);
1711 }
1712
1713 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1714 runtime_ss = ss;
1715 next_slot = true;
1716 }
1717
1718 if (next_slot) {
1719 ss_pos++;
1720
1721 if (syms_ss && runtime_ss)
1722 break;
1723 } else {
1724 symsrc__destroy(ss);
1725 }
1726
1727 }
1728
1729 if (!runtime_ss && !syms_ss)
1730 goto out_free;
1731
1732 if (runtime_ss && !syms_ss) {
1733 syms_ss = runtime_ss;
1734 }
1735
1736 /* We'll have to hope for the best */
1737 if (!runtime_ss && syms_ss)
1738 runtime_ss = syms_ss;
1739
1740 if (syms_ss)
1741 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1742 else
1743 ret = -1;
1744
1745 if (ret > 0) {
1746 int nr_plt;
1747
1748 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1749 if (nr_plt > 0)
1750 ret += nr_plt;
1751 }
1752
1753 for (; ss_pos > 0; ss_pos--)
1754 symsrc__destroy(&ss_[ss_pos - 1]);
1755 out_free:
1756 free(name);
1757 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1758 ret = 0;
1759 out:
1760 dso__set_loaded(dso);
1761 pthread_mutex_unlock(&dso->lock);
1762 nsinfo__mountns_exit(&nsc);
1763
1764 return ret;
1765 }
1766
1767 static int map__strcmp(const void *a, const void *b)
1768 {
1769 const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1770 return strcmp(ma->dso->short_name, mb->dso->short_name);
1771 }
1772
1773 static int map__strcmp_name(const void *name, const void *b)
1774 {
1775 const struct map *map = *(const struct map **)b;
1776 return strcmp(name, map->dso->short_name);
1777 }
1778
1779 void __maps__sort_by_name(struct maps *maps)
1780 {
1781 qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1782 }
1783
1784 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1785 {
1786 struct map *map;
1787 struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1788 int i = 0;
1789
1790 if (maps_by_name == NULL)
1791 return -1;
1792
1793 maps->maps_by_name = maps_by_name;
1794 maps->nr_maps_allocated = maps->nr_maps;
1795
1796 maps__for_each_entry(maps, map)
1797 maps_by_name[i++] = map;
1798
1799 __maps__sort_by_name(maps);
1800 return 0;
1801 }
1802
1803 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1804 {
1805 struct map **mapp;
1806
1807 if (maps->maps_by_name == NULL &&
1808 map__groups__sort_by_name_from_rbtree(maps))
1809 return NULL;
1810
1811 mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1812 if (mapp)
1813 return *mapp;
1814 return NULL;
1815 }
1816
1817 struct map *maps__find_by_name(struct maps *maps, const char *name)
1818 {
1819 struct map *map;
1820
1821 down_read(&maps->lock);
1822
1823 if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1824 map = maps->last_search_by_name;
1825 goto out_unlock;
1826 }
1827 /*
1828 * If we have maps->maps_by_name, then the name isn't in the rbtree,
1829 * as maps->maps_by_name mirrors the rbtree when lookups by name are
1830 * made.
1831 */
1832 map = __maps__find_by_name(maps, name);
1833 if (map || maps->maps_by_name != NULL)
1834 goto out_unlock;
1835
1836 /* Fallback to traversing the rbtree... */
1837 maps__for_each_entry(maps, map)
1838 if (strcmp(map->dso->short_name, name) == 0) {
1839 maps->last_search_by_name = map;
1840 goto out_unlock;
1841 }
1842
1843 map = NULL;
1844
1845 out_unlock:
1846 up_read(&maps->lock);
1847 return map;
1848 }
1849
1850 int dso__load_vmlinux(struct dso *dso, struct map *map,
1851 const char *vmlinux, bool vmlinux_allocated)
1852 {
1853 int err = -1;
1854 struct symsrc ss;
1855 char symfs_vmlinux[PATH_MAX];
1856 enum dso_binary_type symtab_type;
1857
1858 if (vmlinux[0] == '/')
1859 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1860 else
1861 symbol__join_symfs(symfs_vmlinux, vmlinux);
1862
1863 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1864 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1865 else
1866 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1867
1868 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1869 return -1;
1870
1871 err = dso__load_sym(dso, map, &ss, &ss, 0);
1872 symsrc__destroy(&ss);
1873
1874 if (err > 0) {
1875 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1876 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1877 else
1878 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1879 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1880 dso__set_loaded(dso);
1881 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1882 }
1883
1884 return err;
1885 }
1886
1887 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1888 {
1889 int i, err = 0;
1890 char *filename = NULL;
1891
1892 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1893 vmlinux_path__nr_entries + 1);
1894
1895 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1896 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1897 if (err > 0)
1898 goto out;
1899 }
1900
1901 if (!symbol_conf.ignore_vmlinux_buildid)
1902 filename = dso__build_id_filename(dso, NULL, 0, false);
1903 if (filename != NULL) {
1904 err = dso__load_vmlinux(dso, map, filename, true);
1905 if (err > 0)
1906 goto out;
1907 free(filename);
1908 }
1909 out:
1910 return err;
1911 }
1912
1913 static bool visible_dir_filter(const char *name, struct dirent *d)
1914 {
1915 if (d->d_type != DT_DIR)
1916 return false;
1917 return lsdir_no_dot_filter(name, d);
1918 }
1919
1920 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1921 {
1922 char kallsyms_filename[PATH_MAX];
1923 int ret = -1;
1924 struct strlist *dirs;
1925 struct str_node *nd;
1926
1927 dirs = lsdir(dir, visible_dir_filter);
1928 if (!dirs)
1929 return -1;
1930
1931 strlist__for_each_entry(nd, dirs) {
1932 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1933 "%s/%s/kallsyms", dir, nd->s);
1934 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1935 strlcpy(dir, kallsyms_filename, dir_sz);
1936 ret = 0;
1937 break;
1938 }
1939 }
1940
1941 strlist__delete(dirs);
1942
1943 return ret;
1944 }
1945
1946 /*
1947 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1948 * since access(R_OK) only checks with real UID/GID but open() use effective
1949 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1950 */
1951 static bool filename__readable(const char *file)
1952 {
1953 int fd = open(file, O_RDONLY);
1954 if (fd < 0)
1955 return false;
1956 close(fd);
1957 return true;
1958 }
1959
1960 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1961 {
1962 u8 host_build_id[BUILD_ID_SIZE];
1963 char sbuild_id[SBUILD_ID_SIZE];
1964 bool is_host = false;
1965 char path[PATH_MAX];
1966
1967 if (!dso->has_build_id) {
1968 /*
1969 * Last resort, if we don't have a build-id and couldn't find
1970 * any vmlinux file, try the running kernel kallsyms table.
1971 */
1972 goto proc_kallsyms;
1973 }
1974
1975 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1976 sizeof(host_build_id)) == 0)
1977 is_host = dso__build_id_equal(dso, host_build_id);
1978
1979 /* Try a fast path for /proc/kallsyms if possible */
1980 if (is_host) {
1981 /*
1982 * Do not check the build-id cache, unless we know we cannot use
1983 * /proc/kcore or module maps don't match to /proc/kallsyms.
1984 * To check readability of /proc/kcore, do not use access(R_OK)
1985 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1986 * can't check it.
1987 */
1988 if (filename__readable("/proc/kcore") &&
1989 !validate_kcore_addresses("/proc/kallsyms", map))
1990 goto proc_kallsyms;
1991 }
1992
1993 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1994
1995 /* Find kallsyms in build-id cache with kcore */
1996 scnprintf(path, sizeof(path), "%s/%s/%s",
1997 buildid_dir, DSO__NAME_KCORE, sbuild_id);
1998
1999 if (!find_matching_kcore(map, path, sizeof(path)))
2000 return strdup(path);
2001
2002 /* Use current /proc/kallsyms if possible */
2003 if (is_host) {
2004 proc_kallsyms:
2005 return strdup("/proc/kallsyms");
2006 }
2007
2008 /* Finally, find a cache of kallsyms */
2009 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2010 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2011 sbuild_id);
2012 return NULL;
2013 }
2014
2015 return strdup(path);
2016 }
2017
2018 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2019 {
2020 int err;
2021 const char *kallsyms_filename = NULL;
2022 char *kallsyms_allocated_filename = NULL;
2023 /*
2024 * Step 1: if the user specified a kallsyms or vmlinux filename, use
2025 * it and only it, reporting errors to the user if it cannot be used.
2026 *
2027 * For instance, try to analyse an ARM perf.data file _without_ a
2028 * build-id, or if the user specifies the wrong path to the right
2029 * vmlinux file, obviously we can't fallback to another vmlinux (a
2030 * x86_86 one, on the machine where analysis is being performed, say),
2031 * or worse, /proc/kallsyms.
2032 *
2033 * If the specified file _has_ a build-id and there is a build-id
2034 * section in the perf.data file, we will still do the expected
2035 * validation in dso__load_vmlinux and will bail out if they don't
2036 * match.
2037 */
2038 if (symbol_conf.kallsyms_name != NULL) {
2039 kallsyms_filename = symbol_conf.kallsyms_name;
2040 goto do_kallsyms;
2041 }
2042
2043 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2044 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2045 }
2046
2047 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2048 err = dso__load_vmlinux_path(dso, map);
2049 if (err > 0)
2050 return err;
2051 }
2052
2053 /* do not try local files if a symfs was given */
2054 if (symbol_conf.symfs[0] != 0)
2055 return -1;
2056
2057 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2058 if (!kallsyms_allocated_filename)
2059 return -1;
2060
2061 kallsyms_filename = kallsyms_allocated_filename;
2062
2063 do_kallsyms:
2064 err = dso__load_kallsyms(dso, kallsyms_filename, map);
2065 if (err > 0)
2066 pr_debug("Using %s for symbols\n", kallsyms_filename);
2067 free(kallsyms_allocated_filename);
2068
2069 if (err > 0 && !dso__is_kcore(dso)) {
2070 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2071 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2072 map__fixup_start(map);
2073 map__fixup_end(map);
2074 }
2075
2076 return err;
2077 }
2078
2079 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2080 {
2081 int err;
2082 const char *kallsyms_filename = NULL;
2083 struct machine *machine = map__kmaps(map)->machine;
2084 char path[PATH_MAX];
2085
2086 if (machine__is_default_guest(machine)) {
2087 /*
2088 * if the user specified a vmlinux filename, use it and only
2089 * it, reporting errors to the user if it cannot be used.
2090 * Or use file guest_kallsyms inputted by user on commandline
2091 */
2092 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2093 err = dso__load_vmlinux(dso, map,
2094 symbol_conf.default_guest_vmlinux_name,
2095 false);
2096 return err;
2097 }
2098
2099 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2100 if (!kallsyms_filename)
2101 return -1;
2102 } else {
2103 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2104 kallsyms_filename = path;
2105 }
2106
2107 err = dso__load_kallsyms(dso, kallsyms_filename, map);
2108 if (err > 0)
2109 pr_debug("Using %s for symbols\n", kallsyms_filename);
2110 if (err > 0 && !dso__is_kcore(dso)) {
2111 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2112 dso__set_long_name(dso, machine->mmap_name, false);
2113 map__fixup_start(map);
2114 map__fixup_end(map);
2115 }
2116
2117 return err;
2118 }
2119
2120 static void vmlinux_path__exit(void)
2121 {
2122 while (--vmlinux_path__nr_entries >= 0)
2123 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2124 vmlinux_path__nr_entries = 0;
2125
2126 zfree(&vmlinux_path);
2127 }
2128
2129 static const char * const vmlinux_paths[] = {
2130 "vmlinux",
2131 "/boot/vmlinux"
2132 };
2133
2134 static const char * const vmlinux_paths_upd[] = {
2135 "/boot/vmlinux-%s",
2136 "/usr/lib/debug/boot/vmlinux-%s",
2137 "/lib/modules/%s/build/vmlinux",
2138 "/usr/lib/debug/lib/modules/%s/vmlinux",
2139 "/usr/lib/debug/boot/vmlinux-%s.debug"
2140 };
2141
2142 static int vmlinux_path__add(const char *new_entry)
2143 {
2144 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2145 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2146 return -1;
2147 ++vmlinux_path__nr_entries;
2148
2149 return 0;
2150 }
2151
2152 static int vmlinux_path__init(struct perf_env *env)
2153 {
2154 struct utsname uts;
2155 char bf[PATH_MAX];
2156 char *kernel_version;
2157 unsigned int i;
2158
2159 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2160 ARRAY_SIZE(vmlinux_paths_upd)));
2161 if (vmlinux_path == NULL)
2162 return -1;
2163
2164 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2165 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2166 goto out_fail;
2167
2168 /* only try kernel version if no symfs was given */
2169 if (symbol_conf.symfs[0] != 0)
2170 return 0;
2171
2172 if (env) {
2173 kernel_version = env->os_release;
2174 } else {
2175 if (uname(&uts) < 0)
2176 goto out_fail;
2177
2178 kernel_version = uts.release;
2179 }
2180
2181 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2182 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2183 if (vmlinux_path__add(bf) < 0)
2184 goto out_fail;
2185 }
2186
2187 return 0;
2188
2189 out_fail:
2190 vmlinux_path__exit();
2191 return -1;
2192 }
2193
2194 int setup_list(struct strlist **list, const char *list_str,
2195 const char *list_name)
2196 {
2197 if (list_str == NULL)
2198 return 0;
2199
2200 *list = strlist__new(list_str, NULL);
2201 if (!*list) {
2202 pr_err("problems parsing %s list\n", list_name);
2203 return -1;
2204 }
2205
2206 symbol_conf.has_filter = true;
2207 return 0;
2208 }
2209
2210 int setup_intlist(struct intlist **list, const char *list_str,
2211 const char *list_name)
2212 {
2213 if (list_str == NULL)
2214 return 0;
2215
2216 *list = intlist__new(list_str);
2217 if (!*list) {
2218 pr_err("problems parsing %s list\n", list_name);
2219 return -1;
2220 }
2221 return 0;
2222 }
2223
2224 static bool symbol__read_kptr_restrict(void)
2225 {
2226 bool value = false;
2227 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2228
2229 if (fp != NULL) {
2230 char line[8];
2231
2232 if (fgets(line, sizeof(line), fp) != NULL)
2233 value = perf_cap__capable(CAP_SYSLOG) ?
2234 (atoi(line) >= 2) :
2235 (atoi(line) != 0);
2236
2237 fclose(fp);
2238 }
2239
2240 /* Per kernel/kallsyms.c:
2241 * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2242 */
2243 if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2244 value = true;
2245
2246 return value;
2247 }
2248
2249 int symbol__annotation_init(void)
2250 {
2251 if (symbol_conf.init_annotation)
2252 return 0;
2253
2254 if (symbol_conf.initialized) {
2255 pr_err("Annotation needs to be init before symbol__init()\n");
2256 return -1;
2257 }
2258
2259 symbol_conf.priv_size += sizeof(struct annotation);
2260 symbol_conf.init_annotation = true;
2261 return 0;
2262 }
2263
2264 int symbol__init(struct perf_env *env)
2265 {
2266 const char *symfs;
2267
2268 if (symbol_conf.initialized)
2269 return 0;
2270
2271 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2272
2273 symbol__elf_init();
2274
2275 if (symbol_conf.sort_by_name)
2276 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2277 sizeof(struct symbol));
2278
2279 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2280 return -1;
2281
2282 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2283 pr_err("'.' is the only non valid --field-separator argument\n");
2284 return -1;
2285 }
2286
2287 if (setup_list(&symbol_conf.dso_list,
2288 symbol_conf.dso_list_str, "dso") < 0)
2289 return -1;
2290
2291 if (setup_list(&symbol_conf.comm_list,
2292 symbol_conf.comm_list_str, "comm") < 0)
2293 goto out_free_dso_list;
2294
2295 if (setup_intlist(&symbol_conf.pid_list,
2296 symbol_conf.pid_list_str, "pid") < 0)
2297 goto out_free_comm_list;
2298
2299 if (setup_intlist(&symbol_conf.tid_list,
2300 symbol_conf.tid_list_str, "tid") < 0)
2301 goto out_free_pid_list;
2302
2303 if (setup_list(&symbol_conf.sym_list,
2304 symbol_conf.sym_list_str, "symbol") < 0)
2305 goto out_free_tid_list;
2306
2307 if (setup_list(&symbol_conf.bt_stop_list,
2308 symbol_conf.bt_stop_list_str, "symbol") < 0)
2309 goto out_free_sym_list;
2310
2311 /*
2312 * A path to symbols of "/" is identical to ""
2313 * reset here for simplicity.
2314 */
2315 symfs = realpath(symbol_conf.symfs, NULL);
2316 if (symfs == NULL)
2317 symfs = symbol_conf.symfs;
2318 if (strcmp(symfs, "/") == 0)
2319 symbol_conf.symfs = "";
2320 if (symfs != symbol_conf.symfs)
2321 free((void *)symfs);
2322
2323 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2324
2325 symbol_conf.initialized = true;
2326 return 0;
2327
2328 out_free_sym_list:
2329 strlist__delete(symbol_conf.sym_list);
2330 out_free_tid_list:
2331 intlist__delete(symbol_conf.tid_list);
2332 out_free_pid_list:
2333 intlist__delete(symbol_conf.pid_list);
2334 out_free_comm_list:
2335 strlist__delete(symbol_conf.comm_list);
2336 out_free_dso_list:
2337 strlist__delete(symbol_conf.dso_list);
2338 return -1;
2339 }
2340
2341 void symbol__exit(void)
2342 {
2343 if (!symbol_conf.initialized)
2344 return;
2345 strlist__delete(symbol_conf.bt_stop_list);
2346 strlist__delete(symbol_conf.sym_list);
2347 strlist__delete(symbol_conf.dso_list);
2348 strlist__delete(symbol_conf.comm_list);
2349 intlist__delete(symbol_conf.tid_list);
2350 intlist__delete(symbol_conf.pid_list);
2351 vmlinux_path__exit();
2352 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2353 symbol_conf.bt_stop_list = NULL;
2354 symbol_conf.initialized = false;
2355 }
2356
2357 int symbol__config_symfs(const struct option *opt __maybe_unused,
2358 const char *dir, int unset __maybe_unused)
2359 {
2360 char *bf = NULL;
2361 int ret;
2362
2363 symbol_conf.symfs = strdup(dir);
2364 if (symbol_conf.symfs == NULL)
2365 return -ENOMEM;
2366
2367 /* skip the locally configured cache if a symfs is given, and
2368 * config buildid dir to symfs/.debug
2369 */
2370 ret = asprintf(&bf, "%s/%s", dir, ".debug");
2371 if (ret < 0)
2372 return -ENOMEM;
2373
2374 set_buildid_dir(bf);
2375
2376 free(bf);
2377 return 0;
2378 }
2379
2380 struct mem_info *mem_info__get(struct mem_info *mi)
2381 {
2382 if (mi)
2383 refcount_inc(&mi->refcnt);
2384 return mi;
2385 }
2386
2387 void mem_info__put(struct mem_info *mi)
2388 {
2389 if (mi && refcount_dec_and_test(&mi->refcnt))
2390 free(mi);
2391 }
2392
2393 struct mem_info *mem_info__new(void)
2394 {
2395 struct mem_info *mi = zalloc(sizeof(*mi));
2396
2397 if (mi)
2398 refcount_set(&mi->refcnt, 1);
2399 return mi;
2400 }
Linux with added FPC-III support