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kvm tools, setup: Create private directory
[linux-2.6/next.git] / tools / perf / util / symbol.c
blobeec196329fd92c2e0567c8af5535ae1a99fcc4b1
1 #define _GNU_SOURCE
2 #include <ctype.h>
3 #include <dirent.h>
4 #include <errno.h>
5 #include <libgen.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 #include <sys/types.h>
10 #include <sys/stat.h>
11 #include <sys/param.h>
12 #include <fcntl.h>
13 #include <unistd.h>
14 #include <inttypes.h>
15 #include "build-id.h"
16 #include "debug.h"
17 #include "symbol.h"
18 #include "strlist.h"
19
20 #include <libelf.h>
21 #include <gelf.h>
22 #include <elf.h>
23 #include <limits.h>
24 #include <sys/utsname.h>
25
26 #ifndef KSYM_NAME_LEN
27 #define KSYM_NAME_LEN 128
28 #endif
29
30 #ifndef NT_GNU_BUILD_ID
31 #define NT_GNU_BUILD_ID 3
32 #endif
33
34 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
35 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
36 static void dsos__add(struct list_head *head, struct dso *dso);
37 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
38 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
39 symbol_filter_t filter);
40 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
41 symbol_filter_t filter);
42 static int vmlinux_path__nr_entries;
43 static char **vmlinux_path;
44
45 struct symbol_conf symbol_conf = {
46 .exclude_other = true,
47 .use_modules = true,
48 .try_vmlinux_path = true,
49 .symfs = "",
50 };
51
52 int dso__name_len(const struct dso *dso)
53 {
54 if (verbose)
55 return dso->long_name_len;
56
57 return dso->short_name_len;
58 }
59
60 bool dso__loaded(const struct dso *dso, enum map_type type)
61 {
62 return dso->loaded & (1 << type);
63 }
64
65 bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
66 {
67 return dso->sorted_by_name & (1 << type);
68 }
69
70 static void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
71 {
72 dso->sorted_by_name |= (1 << type);
73 }
74
75 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
76 {
77 switch (map_type) {
78 case MAP__FUNCTION:
79 return symbol_type == 'T' || symbol_type == 'W';
80 case MAP__VARIABLE:
81 return symbol_type == 'D' || symbol_type == 'd';
82 default:
83 return false;
84 }
85 }
86
87 static void symbols__fixup_end(struct rb_root *symbols)
88 {
89 struct rb_node *nd, *prevnd = rb_first(symbols);
90 struct symbol *curr, *prev;
91
92 if (prevnd == NULL)
93 return;
94
95 curr = rb_entry(prevnd, struct symbol, rb_node);
96
97 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
98 prev = curr;
99 curr = rb_entry(nd, struct symbol, rb_node);
100
101 if (prev->end == prev->start && prev->end != curr->start)
102 prev->end = curr->start - 1;
103 }
104
105 /* Last entry */
106 if (curr->end == curr->start)
107 curr->end = roundup(curr->start, 4096);
108 }
109
110 static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
111 {
112 struct map *prev, *curr;
113 struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
114
115 if (prevnd == NULL)
116 return;
117
118 curr = rb_entry(prevnd, struct map, rb_node);
119
120 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
121 prev = curr;
122 curr = rb_entry(nd, struct map, rb_node);
123 prev->end = curr->start - 1;
124 }
125
126 /*
127 * We still haven't the actual symbols, so guess the
128 * last map final address.
129 */
130 curr->end = ~0ULL;
131 }
132
133 static void map_groups__fixup_end(struct map_groups *mg)
134 {
135 int i;
136 for (i = 0; i < MAP__NR_TYPES; ++i)
137 __map_groups__fixup_end(mg, i);
138 }
139
140 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
141 const char *name)
142 {
143 size_t namelen = strlen(name) + 1;
144 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
145 sizeof(*sym) + namelen));
146 if (sym == NULL)
147 return NULL;
148
149 if (symbol_conf.priv_size)
150 sym = ((void *)sym) + symbol_conf.priv_size;
151
152 sym->start = start;
153 sym->end = len ? start + len - 1 : start;
154 sym->binding = binding;
155 sym->namelen = namelen - 1;
156
157 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
158 __func__, name, start, sym->end);
159 memcpy(sym->name, name, namelen);
160
161 return sym;
162 }
163
164 void symbol__delete(struct symbol *sym)
165 {
166 free(((void *)sym) - symbol_conf.priv_size);
167 }
168
169 static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
170 {
171 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
172 sym->start, sym->end,
173 sym->binding == STB_GLOBAL ? 'g' :
174 sym->binding == STB_LOCAL ? 'l' : 'w',
175 sym->name);
176 }
177
178 void dso__set_long_name(struct dso *dso, char *name)
179 {
180 if (name == NULL)
181 return;
182 dso->long_name = name;
183 dso->long_name_len = strlen(name);
184 }
185
186 static void dso__set_short_name(struct dso *dso, const char *name)
187 {
188 if (name == NULL)
189 return;
190 dso->short_name = name;
191 dso->short_name_len = strlen(name);
192 }
193
194 static void dso__set_basename(struct dso *dso)
195 {
196 dso__set_short_name(dso, basename(dso->long_name));
197 }
198
199 struct dso *dso__new(const char *name)
200 {
201 struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
202
203 if (dso != NULL) {
204 int i;
205 strcpy(dso->name, name);
206 dso__set_long_name(dso, dso->name);
207 dso__set_short_name(dso, dso->name);
208 for (i = 0; i < MAP__NR_TYPES; ++i)
209 dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
210 dso->symtab_type = SYMTAB__NOT_FOUND;
211 dso->loaded = 0;
212 dso->sorted_by_name = 0;
213 dso->has_build_id = 0;
214 dso->kernel = DSO_TYPE_USER;
215 INIT_LIST_HEAD(&dso->node);
216 }
217
218 return dso;
219 }
220
221 static void symbols__delete(struct rb_root *symbols)
222 {
223 struct symbol *pos;
224 struct rb_node *next = rb_first(symbols);
225
226 while (next) {
227 pos = rb_entry(next, struct symbol, rb_node);
228 next = rb_next(&pos->rb_node);
229 rb_erase(&pos->rb_node, symbols);
230 symbol__delete(pos);
231 }
232 }
233
234 void dso__delete(struct dso *dso)
235 {
236 int i;
237 for (i = 0; i < MAP__NR_TYPES; ++i)
238 symbols__delete(&dso->symbols[i]);
239 if (dso->sname_alloc)
240 free((char *)dso->short_name);
241 if (dso->lname_alloc)
242 free(dso->long_name);
243 free(dso);
244 }
245
246 void dso__set_build_id(struct dso *dso, void *build_id)
247 {
248 memcpy(dso->build_id, build_id, sizeof(dso->build_id));
249 dso->has_build_id = 1;
250 }
251
252 static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
253 {
254 struct rb_node **p = &symbols->rb_node;
255 struct rb_node *parent = NULL;
256 const u64 ip = sym->start;
257 struct symbol *s;
258
259 while (*p != NULL) {
260 parent = *p;
261 s = rb_entry(parent, struct symbol, rb_node);
262 if (ip < s->start)
263 p = &(*p)->rb_left;
264 else
265 p = &(*p)->rb_right;
266 }
267 rb_link_node(&sym->rb_node, parent, p);
268 rb_insert_color(&sym->rb_node, symbols);
269 }
270
271 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
272 {
273 struct rb_node *n;
274
275 if (symbols == NULL)
276 return NULL;
277
278 n = symbols->rb_node;
279
280 while (n) {
281 struct symbol *s = rb_entry(n, struct symbol, rb_node);
282
283 if (ip < s->start)
284 n = n->rb_left;
285 else if (ip > s->end)
286 n = n->rb_right;
287 else
288 return s;
289 }
290
291 return NULL;
292 }
293
294 struct symbol_name_rb_node {
295 struct rb_node rb_node;
296 struct symbol sym;
297 };
298
299 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
300 {
301 struct rb_node **p = &symbols->rb_node;
302 struct rb_node *parent = NULL;
303 struct symbol_name_rb_node *symn, *s;
304
305 symn = container_of(sym, struct symbol_name_rb_node, sym);
306
307 while (*p != NULL) {
308 parent = *p;
309 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
310 if (strcmp(sym->name, s->sym.name) < 0)
311 p = &(*p)->rb_left;
312 else
313 p = &(*p)->rb_right;
314 }
315 rb_link_node(&symn->rb_node, parent, p);
316 rb_insert_color(&symn->rb_node, symbols);
317 }
318
319 static void symbols__sort_by_name(struct rb_root *symbols,
320 struct rb_root *source)
321 {
322 struct rb_node *nd;
323
324 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
325 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
326 symbols__insert_by_name(symbols, pos);
327 }
328 }
329
330 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
331 const char *name)
332 {
333 struct rb_node *n;
334
335 if (symbols == NULL)
336 return NULL;
337
338 n = symbols->rb_node;
339
340 while (n) {
341 struct symbol_name_rb_node *s;
342 int cmp;
343
344 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
345 cmp = strcmp(name, s->sym.name);
346
347 if (cmp < 0)
348 n = n->rb_left;
349 else if (cmp > 0)
350 n = n->rb_right;
351 else
352 return &s->sym;
353 }
354
355 return NULL;
356 }
357
358 struct symbol *dso__find_symbol(struct dso *dso,
359 enum map_type type, u64 addr)
360 {
361 return symbols__find(&dso->symbols[type], addr);
362 }
363
364 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
365 const char *name)
366 {
367 return symbols__find_by_name(&dso->symbol_names[type], name);
368 }
369
370 void dso__sort_by_name(struct dso *dso, enum map_type type)
371 {
372 dso__set_sorted_by_name(dso, type);
373 return symbols__sort_by_name(&dso->symbol_names[type],
374 &dso->symbols[type]);
375 }
376
377 int build_id__sprintf(const u8 *build_id, int len, char *bf)
378 {
379 char *bid = bf;
380 const u8 *raw = build_id;
381 int i;
382
383 for (i = 0; i < len; ++i) {
384 sprintf(bid, "%02x", *raw);
385 ++raw;
386 bid += 2;
387 }
388
389 return raw - build_id;
390 }
391
392 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
393 {
394 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
395
396 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
397 return fprintf(fp, "%s", sbuild_id);
398 }
399
400 size_t dso__fprintf_symbols_by_name(struct dso *dso,
401 enum map_type type, FILE *fp)
402 {
403 size_t ret = 0;
404 struct rb_node *nd;
405 struct symbol_name_rb_node *pos;
406
407 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
408 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
409 fprintf(fp, "%s\n", pos->sym.name);
410 }
411
412 return ret;
413 }
414
415 size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
416 {
417 struct rb_node *nd;
418 size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
419
420 if (dso->short_name != dso->long_name)
421 ret += fprintf(fp, "%s, ", dso->long_name);
422 ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
423 dso->loaded ? "" : "NOT ");
424 ret += dso__fprintf_buildid(dso, fp);
425 ret += fprintf(fp, ")\n");
426 for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
427 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
428 ret += symbol__fprintf(pos, fp);
429 }
430
431 return ret;
432 }
433
434 int kallsyms__parse(const char *filename, void *arg,
435 int (*process_symbol)(void *arg, const char *name,
436 char type, u64 start, u64 end))
437 {
438 char *line = NULL;
439 size_t n;
440 int err = -1;
441 u64 prev_start = 0;
442 char prev_symbol_type = 0;
443 char *prev_symbol_name;
444 FILE *file = fopen(filename, "r");
445
446 if (file == NULL)
447 goto out_failure;
448
449 prev_symbol_name = malloc(KSYM_NAME_LEN);
450 if (prev_symbol_name == NULL)
451 goto out_close;
452
453 err = 0;
454
455 while (!feof(file)) {
456 u64 start;
457 int line_len, len;
458 char symbol_type;
459 char *symbol_name;
460
461 line_len = getline(&line, &n, file);
462 if (line_len < 0 || !line)
463 break;
464
465 line[--line_len] = '\0'; /* \n */
466
467 len = hex2u64(line, &start);
468
469 len++;
470 if (len + 2 >= line_len)
471 continue;
472
473 symbol_type = toupper(line[len]);
474 len += 2;
475 symbol_name = line + len;
476 len = line_len - len;
477
478 if (len >= KSYM_NAME_LEN) {
479 err = -1;
480 break;
481 }
482
483 if (prev_symbol_type) {
484 u64 end = start;
485 if (end != prev_start)
486 --end;
487 err = process_symbol(arg, prev_symbol_name,
488 prev_symbol_type, prev_start, end);
489 if (err)
490 break;
491 }
492
493 memcpy(prev_symbol_name, symbol_name, len + 1);
494 prev_symbol_type = symbol_type;
495 prev_start = start;
496 }
497
498 free(prev_symbol_name);
499 free(line);
500 out_close:
501 fclose(file);
502 return err;
503
504 out_failure:
505 return -1;
506 }
507
508 struct process_kallsyms_args {
509 struct map *map;
510 struct dso *dso;
511 };
512
513 static u8 kallsyms2elf_type(char type)
514 {
515 if (type == 'W')
516 return STB_WEAK;
517
518 return isupper(type) ? STB_GLOBAL : STB_LOCAL;
519 }
520
521 static int map__process_kallsym_symbol(void *arg, const char *name,
522 char type, u64 start, u64 end)
523 {
524 struct symbol *sym;
525 struct process_kallsyms_args *a = arg;
526 struct rb_root *root = &a->dso->symbols[a->map->type];
527
528 if (!symbol_type__is_a(type, a->map->type))
529 return 0;
530
531 sym = symbol__new(start, end - start + 1,
532 kallsyms2elf_type(type), name);
533 if (sym == NULL)
534 return -ENOMEM;
535 /*
536 * We will pass the symbols to the filter later, in
537 * map__split_kallsyms, when we have split the maps per module
538 */
539 symbols__insert(root, sym);
540
541 return 0;
542 }
543
544 /*
545 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
546 * so that we can in the next step set the symbol ->end address and then
547 * call kernel_maps__split_kallsyms.
548 */
549 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
550 struct map *map)
551 {
552 struct process_kallsyms_args args = { .map = map, .dso = dso, };
553 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
554 }
555
556 /*
557 * Split the symbols into maps, making sure there are no overlaps, i.e. the
558 * kernel range is broken in several maps, named [kernel].N, as we don't have
559 * the original ELF section names vmlinux have.
560 */
561 static int dso__split_kallsyms(struct dso *dso, struct map *map,
562 symbol_filter_t filter)
563 {
564 struct map_groups *kmaps = map__kmap(map)->kmaps;
565 struct machine *machine = kmaps->machine;
566 struct map *curr_map = map;
567 struct symbol *pos;
568 int count = 0, moved = 0;
569 struct rb_root *root = &dso->symbols[map->type];
570 struct rb_node *next = rb_first(root);
571 int kernel_range = 0;
572
573 while (next) {
574 char *module;
575
576 pos = rb_entry(next, struct symbol, rb_node);
577 next = rb_next(&pos->rb_node);
578
579 module = strchr(pos->name, '\t');
580 if (module) {
581 if (!symbol_conf.use_modules)
582 goto discard_symbol;
583
584 *module++ = '\0';
585
586 if (strcmp(curr_map->dso->short_name, module)) {
587 if (curr_map != map &&
588 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
589 machine__is_default_guest(machine)) {
590 /*
591 * We assume all symbols of a module are
592 * continuous in * kallsyms, so curr_map
593 * points to a module and all its
594 * symbols are in its kmap. Mark it as
595 * loaded.
596 */
597 dso__set_loaded(curr_map->dso,
598 curr_map->type);
599 }
600
601 curr_map = map_groups__find_by_name(kmaps,
602 map->type, module);
603 if (curr_map == NULL) {
604 pr_debug("%s/proc/{kallsyms,modules} "
605 "inconsistency while looking "
606 "for \"%s\" module!\n",
607 machine->root_dir, module);
608 curr_map = map;
609 goto discard_symbol;
610 }
611
612 if (curr_map->dso->loaded &&
613 !machine__is_default_guest(machine))
614 goto discard_symbol;
615 }
616 /*
617 * So that we look just like we get from .ko files,
618 * i.e. not prelinked, relative to map->start.
619 */
620 pos->start = curr_map->map_ip(curr_map, pos->start);
621 pos->end = curr_map->map_ip(curr_map, pos->end);
622 } else if (curr_map != map) {
623 char dso_name[PATH_MAX];
624 struct dso *ndso;
625
626 if (count == 0) {
627 curr_map = map;
628 goto filter_symbol;
629 }
630
631 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
632 snprintf(dso_name, sizeof(dso_name),
633 "[guest.kernel].%d",
634 kernel_range++);
635 else
636 snprintf(dso_name, sizeof(dso_name),
637 "[kernel].%d",
638 kernel_range++);
639
640 ndso = dso__new(dso_name);
641 if (ndso == NULL)
642 return -1;
643
644 ndso->kernel = dso->kernel;
645
646 curr_map = map__new2(pos->start, ndso, map->type);
647 if (curr_map == NULL) {
648 dso__delete(ndso);
649 return -1;
650 }
651
652 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
653 map_groups__insert(kmaps, curr_map);
654 ++kernel_range;
655 }
656 filter_symbol:
657 if (filter && filter(curr_map, pos)) {
658 discard_symbol: rb_erase(&pos->rb_node, root);
659 symbol__delete(pos);
660 } else {
661 if (curr_map != map) {
662 rb_erase(&pos->rb_node, root);
663 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
664 ++moved;
665 } else
666 ++count;
667 }
668 }
669
670 if (curr_map != map &&
671 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
672 machine__is_default_guest(kmaps->machine)) {
673 dso__set_loaded(curr_map->dso, curr_map->type);
674 }
675
676 return count + moved;
677 }
678
679 static bool symbol__restricted_filename(const char *filename,
680 const char *restricted_filename)
681 {
682 bool restricted = false;
683
684 if (symbol_conf.kptr_restrict) {
685 char *r = realpath(filename, NULL);
686
687 if (r != NULL) {
688 restricted = strcmp(r, restricted_filename) == 0;
689 free(r);
690 return restricted;
691 }
692 }
693
694 return restricted;
695 }
696
697 int dso__load_kallsyms(struct dso *dso, const char *filename,
698 struct map *map, symbol_filter_t filter)
699 {
700 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
701 return -1;
702
703 if (dso__load_all_kallsyms(dso, filename, map) < 0)
704 return -1;
705
706 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
707 dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
708 else
709 dso->symtab_type = SYMTAB__KALLSYMS;
710
711 return dso__split_kallsyms(dso, map, filter);
712 }
713
714 static int dso__load_perf_map(struct dso *dso, struct map *map,
715 symbol_filter_t filter)
716 {
717 char *line = NULL;
718 size_t n;
719 FILE *file;
720 int nr_syms = 0;
721
722 file = fopen(dso->long_name, "r");
723 if (file == NULL)
724 goto out_failure;
725
726 while (!feof(file)) {
727 u64 start, size;
728 struct symbol *sym;
729 int line_len, len;
730
731 line_len = getline(&line, &n, file);
732 if (line_len < 0)
733 break;
734
735 if (!line)
736 goto out_failure;
737
738 line[--line_len] = '\0'; /* \n */
739
740 len = hex2u64(line, &start);
741
742 len++;
743 if (len + 2 >= line_len)
744 continue;
745
746 len += hex2u64(line + len, &size);
747
748 len++;
749 if (len + 2 >= line_len)
750 continue;
751
752 sym = symbol__new(start, size, STB_GLOBAL, line + len);
753
754 if (sym == NULL)
755 goto out_delete_line;
756
757 if (filter && filter(map, sym))
758 symbol__delete(sym);
759 else {
760 symbols__insert(&dso->symbols[map->type], sym);
761 nr_syms++;
762 }
763 }
764
765 free(line);
766 fclose(file);
767
768 return nr_syms;
769
770 out_delete_line:
771 free(line);
772 out_failure:
773 return -1;
774 }
775
776 /**
777 * elf_symtab__for_each_symbol - iterate thru all the symbols
778 *
779 * @syms: struct elf_symtab instance to iterate
780 * @idx: uint32_t idx
781 * @sym: GElf_Sym iterator
782 */
783 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
784 for (idx = 0, gelf_getsym(syms, idx, &sym);\
785 idx < nr_syms; \
786 idx++, gelf_getsym(syms, idx, &sym))
787
788 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
789 {
790 return GELF_ST_TYPE(sym->st_info);
791 }
792
793 static inline int elf_sym__is_function(const GElf_Sym *sym)
794 {
795 return elf_sym__type(sym) == STT_FUNC &&
796 sym->st_name != 0 &&
797 sym->st_shndx != SHN_UNDEF;
798 }
799
800 static inline bool elf_sym__is_object(const GElf_Sym *sym)
801 {
802 return elf_sym__type(sym) == STT_OBJECT &&
803 sym->st_name != 0 &&
804 sym->st_shndx != SHN_UNDEF;
805 }
806
807 static inline int elf_sym__is_label(const GElf_Sym *sym)
808 {
809 return elf_sym__type(sym) == STT_NOTYPE &&
810 sym->st_name != 0 &&
811 sym->st_shndx != SHN_UNDEF &&
812 sym->st_shndx != SHN_ABS;
813 }
814
815 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
816 const Elf_Data *secstrs)
817 {
818 return secstrs->d_buf + shdr->sh_name;
819 }
820
821 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
822 const Elf_Data *secstrs)
823 {
824 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
825 }
826
827 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
828 const Elf_Data *secstrs)
829 {
830 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
831 }
832
833 static inline const char *elf_sym__name(const GElf_Sym *sym,
834 const Elf_Data *symstrs)
835 {
836 return symstrs->d_buf + sym->st_name;
837 }
838
839 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
840 GElf_Shdr *shp, const char *name,
841 size_t *idx)
842 {
843 Elf_Scn *sec = NULL;
844 size_t cnt = 1;
845
846 while ((sec = elf_nextscn(elf, sec)) != NULL) {
847 char *str;
848
849 gelf_getshdr(sec, shp);
850 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
851 if (!strcmp(name, str)) {
852 if (idx)
853 *idx = cnt;
854 break;
855 }
856 ++cnt;
857 }
858
859 return sec;
860 }
861
862 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
863 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
864 idx < nr_entries; \
865 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
866
867 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
868 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
869 idx < nr_entries; \
870 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
871
872 /*
873 * We need to check if we have a .dynsym, so that we can handle the
874 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
875 * .dynsym or .symtab).
876 * And always look at the original dso, not at debuginfo packages, that
877 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
878 */
879 static int dso__synthesize_plt_symbols(struct dso *dso, struct map *map,
880 symbol_filter_t filter)
881 {
882 uint32_t nr_rel_entries, idx;
883 GElf_Sym sym;
884 u64 plt_offset;
885 GElf_Shdr shdr_plt;
886 struct symbol *f;
887 GElf_Shdr shdr_rel_plt, shdr_dynsym;
888 Elf_Data *reldata, *syms, *symstrs;
889 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
890 size_t dynsym_idx;
891 GElf_Ehdr ehdr;
892 char sympltname[1024];
893 Elf *elf;
894 int nr = 0, symidx, fd, err = 0;
895 char name[PATH_MAX];
896
897 snprintf(name, sizeof(name), "%s%s",
898 symbol_conf.symfs, dso->long_name);
899 fd = open(name, O_RDONLY);
900 if (fd < 0)
901 goto out;
902
903 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
904 if (elf == NULL)
905 goto out_close;
906
907 if (gelf_getehdr(elf, &ehdr) == NULL)
908 goto out_elf_end;
909
910 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
911 ".dynsym", &dynsym_idx);
912 if (scn_dynsym == NULL)
913 goto out_elf_end;
914
915 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
916 ".rela.plt", NULL);
917 if (scn_plt_rel == NULL) {
918 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
919 ".rel.plt", NULL);
920 if (scn_plt_rel == NULL)
921 goto out_elf_end;
922 }
923
924 err = -1;
925
926 if (shdr_rel_plt.sh_link != dynsym_idx)
927 goto out_elf_end;
928
929 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
930 goto out_elf_end;
931
932 /*
933 * Fetch the relocation section to find the idxes to the GOT
934 * and the symbols in the .dynsym they refer to.
935 */
936 reldata = elf_getdata(scn_plt_rel, NULL);
937 if (reldata == NULL)
938 goto out_elf_end;
939
940 syms = elf_getdata(scn_dynsym, NULL);
941 if (syms == NULL)
942 goto out_elf_end;
943
944 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
945 if (scn_symstrs == NULL)
946 goto out_elf_end;
947
948 symstrs = elf_getdata(scn_symstrs, NULL);
949 if (symstrs == NULL)
950 goto out_elf_end;
951
952 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
953 plt_offset = shdr_plt.sh_offset;
954
955 if (shdr_rel_plt.sh_type == SHT_RELA) {
956 GElf_Rela pos_mem, *pos;
957
958 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
959 nr_rel_entries) {
960 symidx = GELF_R_SYM(pos->r_info);
961 plt_offset += shdr_plt.sh_entsize;
962 gelf_getsym(syms, symidx, &sym);
963 snprintf(sympltname, sizeof(sympltname),
964 "%s@plt", elf_sym__name(&sym, symstrs));
965
966 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
967 STB_GLOBAL, sympltname);
968 if (!f)
969 goto out_elf_end;
970
971 if (filter && filter(map, f))
972 symbol__delete(f);
973 else {
974 symbols__insert(&dso->symbols[map->type], f);
975 ++nr;
976 }
977 }
978 } else if (shdr_rel_plt.sh_type == SHT_REL) {
979 GElf_Rel pos_mem, *pos;
980 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
981 nr_rel_entries) {
982 symidx = GELF_R_SYM(pos->r_info);
983 plt_offset += shdr_plt.sh_entsize;
984 gelf_getsym(syms, symidx, &sym);
985 snprintf(sympltname, sizeof(sympltname),
986 "%s@plt", elf_sym__name(&sym, symstrs));
987
988 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
989 STB_GLOBAL, sympltname);
990 if (!f)
991 goto out_elf_end;
992
993 if (filter && filter(map, f))
994 symbol__delete(f);
995 else {
996 symbols__insert(&dso->symbols[map->type], f);
997 ++nr;
998 }
999 }
1000 }
1001
1002 err = 0;
1003 out_elf_end:
1004 elf_end(elf);
1005 out_close:
1006 close(fd);
1007
1008 if (err == 0)
1009 return nr;
1010 out:
1011 pr_debug("%s: problems reading %s PLT info.\n",
1012 __func__, dso->long_name);
1013 return 0;
1014 }
1015
1016 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
1017 {
1018 switch (type) {
1019 case MAP__FUNCTION:
1020 return elf_sym__is_function(sym);
1021 case MAP__VARIABLE:
1022 return elf_sym__is_object(sym);
1023 default:
1024 return false;
1025 }
1026 }
1027
1028 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
1029 enum map_type type)
1030 {
1031 switch (type) {
1032 case MAP__FUNCTION:
1033 return elf_sec__is_text(shdr, secstrs);
1034 case MAP__VARIABLE:
1035 return elf_sec__is_data(shdr, secstrs);
1036 default:
1037 return false;
1038 }
1039 }
1040
1041 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1042 {
1043 Elf_Scn *sec = NULL;
1044 GElf_Shdr shdr;
1045 size_t cnt = 1;
1046
1047 while ((sec = elf_nextscn(elf, sec)) != NULL) {
1048 gelf_getshdr(sec, &shdr);
1049
1050 if ((addr >= shdr.sh_addr) &&
1051 (addr < (shdr.sh_addr + shdr.sh_size)))
1052 return cnt;
1053
1054 ++cnt;
1055 }
1056
1057 return -1;
1058 }
1059
1060 static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
1061 int fd, symbol_filter_t filter, int kmodule,
1062 int want_symtab)
1063 {
1064 struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
1065 struct map *curr_map = map;
1066 struct dso *curr_dso = dso;
1067 Elf_Data *symstrs, *secstrs;
1068 uint32_t nr_syms;
1069 int err = -1;
1070 uint32_t idx;
1071 GElf_Ehdr ehdr;
1072 GElf_Shdr shdr, opdshdr;
1073 Elf_Data *syms, *opddata = NULL;
1074 GElf_Sym sym;
1075 Elf_Scn *sec, *sec_strndx, *opdsec;
1076 Elf *elf;
1077 int nr = 0;
1078 size_t opdidx = 0;
1079
1080 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1081 if (elf == NULL) {
1082 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1083 goto out_close;
1084 }
1085
1086 if (gelf_getehdr(elf, &ehdr) == NULL) {
1087 pr_debug("%s: cannot get elf header.\n", __func__);
1088 goto out_elf_end;
1089 }
1090
1091 /* Always reject images with a mismatched build-id: */
1092 if (dso->has_build_id) {
1093 u8 build_id[BUILD_ID_SIZE];
1094
1095 if (elf_read_build_id(elf, build_id,
1096 BUILD_ID_SIZE) != BUILD_ID_SIZE)
1097 goto out_elf_end;
1098
1099 if (!dso__build_id_equal(dso, build_id))
1100 goto out_elf_end;
1101 }
1102
1103 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1104 if (sec == NULL) {
1105 if (want_symtab)
1106 goto out_elf_end;
1107
1108 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1109 if (sec == NULL)
1110 goto out_elf_end;
1111 }
1112
1113 opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1114 if (opdsec)
1115 opddata = elf_rawdata(opdsec, NULL);
1116
1117 syms = elf_getdata(sec, NULL);
1118 if (syms == NULL)
1119 goto out_elf_end;
1120
1121 sec = elf_getscn(elf, shdr.sh_link);
1122 if (sec == NULL)
1123 goto out_elf_end;
1124
1125 symstrs = elf_getdata(sec, NULL);
1126 if (symstrs == NULL)
1127 goto out_elf_end;
1128
1129 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1130 if (sec_strndx == NULL)
1131 goto out_elf_end;
1132
1133 secstrs = elf_getdata(sec_strndx, NULL);
1134 if (secstrs == NULL)
1135 goto out_elf_end;
1136
1137 nr_syms = shdr.sh_size / shdr.sh_entsize;
1138
1139 memset(&sym, 0, sizeof(sym));
1140 if (dso->kernel == DSO_TYPE_USER) {
1141 dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1142 elf_section_by_name(elf, &ehdr, &shdr,
1143 ".gnu.prelink_undo",
1144 NULL) != NULL);
1145 } else {
1146 dso->adjust_symbols = 0;
1147 }
1148 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1149 struct symbol *f;
1150 const char *elf_name = elf_sym__name(&sym, symstrs);
1151 char *demangled = NULL;
1152 int is_label = elf_sym__is_label(&sym);
1153 const char *section_name;
1154
1155 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1156 strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1157 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1158
1159 if (!is_label && !elf_sym__is_a(&sym, map->type))
1160 continue;
1161
1162 /* Reject ARM ELF "mapping symbols": these aren't unique and
1163 * don't identify functions, so will confuse the profile
1164 * output: */
1165 if (ehdr.e_machine == EM_ARM) {
1166 if (!strcmp(elf_name, "$a") ||
1167 !strcmp(elf_name, "$d") ||
1168 !strcmp(elf_name, "$t"))
1169 continue;
1170 }
1171
1172 if (opdsec && sym.st_shndx == opdidx) {
1173 u32 offset = sym.st_value - opdshdr.sh_addr;
1174 u64 *opd = opddata->d_buf + offset;
1175 sym.st_value = *opd;
1176 sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1177 }
1178
1179 sec = elf_getscn(elf, sym.st_shndx);
1180 if (!sec)
1181 goto out_elf_end;
1182
1183 gelf_getshdr(sec, &shdr);
1184
1185 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1186 continue;
1187
1188 section_name = elf_sec__name(&shdr, secstrs);
1189
1190 /* On ARM, symbols for thumb functions have 1 added to
1191 * the symbol address as a flag - remove it */
1192 if ((ehdr.e_machine == EM_ARM) &&
1193 (map->type == MAP__FUNCTION) &&
1194 (sym.st_value & 1))
1195 --sym.st_value;
1196
1197 if (dso->kernel != DSO_TYPE_USER || kmodule) {
1198 char dso_name[PATH_MAX];
1199
1200 if (strcmp(section_name,
1201 (curr_dso->short_name +
1202 dso->short_name_len)) == 0)
1203 goto new_symbol;
1204
1205 if (strcmp(section_name, ".text") == 0) {
1206 curr_map = map;
1207 curr_dso = dso;
1208 goto new_symbol;
1209 }
1210
1211 snprintf(dso_name, sizeof(dso_name),
1212 "%s%s", dso->short_name, section_name);
1213
1214 curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1215 if (curr_map == NULL) {
1216 u64 start = sym.st_value;
1217
1218 if (kmodule)
1219 start += map->start + shdr.sh_offset;
1220
1221 curr_dso = dso__new(dso_name);
1222 if (curr_dso == NULL)
1223 goto out_elf_end;
1224 curr_dso->kernel = dso->kernel;
1225 curr_dso->long_name = dso->long_name;
1226 curr_dso->long_name_len = dso->long_name_len;
1227 curr_map = map__new2(start, curr_dso,
1228 map->type);
1229 if (curr_map == NULL) {
1230 dso__delete(curr_dso);
1231 goto out_elf_end;
1232 }
1233 curr_map->map_ip = identity__map_ip;
1234 curr_map->unmap_ip = identity__map_ip;
1235 curr_dso->symtab_type = dso->symtab_type;
1236 map_groups__insert(kmap->kmaps, curr_map);
1237 dsos__add(&dso->node, curr_dso);
1238 dso__set_loaded(curr_dso, map->type);
1239 } else
1240 curr_dso = curr_map->dso;
1241
1242 goto new_symbol;
1243 }
1244
1245 if (curr_dso->adjust_symbols) {
1246 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1247 "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1248 (u64)sym.st_value, (u64)shdr.sh_addr,
1249 (u64)shdr.sh_offset);
1250 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1251 }
1252 /*
1253 * We need to figure out if the object was created from C++ sources
1254 * DWARF DW_compile_unit has this, but we don't always have access
1255 * to it...
1256 */
1257 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1258 if (demangled != NULL)
1259 elf_name = demangled;
1260 new_symbol:
1261 f = symbol__new(sym.st_value, sym.st_size,
1262 GELF_ST_BIND(sym.st_info), elf_name);
1263 free(demangled);
1264 if (!f)
1265 goto out_elf_end;
1266
1267 if (filter && filter(curr_map, f))
1268 symbol__delete(f);
1269 else {
1270 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1271 nr++;
1272 }
1273 }
1274
1275 /*
1276 * For misannotated, zeroed, ASM function sizes.
1277 */
1278 if (nr > 0) {
1279 symbols__fixup_end(&dso->symbols[map->type]);
1280 if (kmap) {
1281 /*
1282 * We need to fixup this here too because we create new
1283 * maps here, for things like vsyscall sections.
1284 */
1285 __map_groups__fixup_end(kmap->kmaps, map->type);
1286 }
1287 }
1288 err = nr;
1289 out_elf_end:
1290 elf_end(elf);
1291 out_close:
1292 return err;
1293 }
1294
1295 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1296 {
1297 return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1298 }
1299
1300 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1301 {
1302 bool have_build_id = false;
1303 struct dso *pos;
1304
1305 list_for_each_entry(pos, head, node) {
1306 if (with_hits && !pos->hit)
1307 continue;
1308 if (pos->has_build_id) {
1309 have_build_id = true;
1310 continue;
1311 }
1312 if (filename__read_build_id(pos->long_name, pos->build_id,
1313 sizeof(pos->build_id)) > 0) {
1314 have_build_id = true;
1315 pos->has_build_id = true;
1316 }
1317 }
1318
1319 return have_build_id;
1320 }
1321
1322 /*
1323 * Align offset to 4 bytes as needed for note name and descriptor data.
1324 */
1325 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1326
1327 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1328 {
1329 int err = -1;
1330 GElf_Ehdr ehdr;
1331 GElf_Shdr shdr;
1332 Elf_Data *data;
1333 Elf_Scn *sec;
1334 Elf_Kind ek;
1335 void *ptr;
1336
1337 if (size < BUILD_ID_SIZE)
1338 goto out;
1339
1340 ek = elf_kind(elf);
1341 if (ek != ELF_K_ELF)
1342 goto out;
1343
1344 if (gelf_getehdr(elf, &ehdr) == NULL) {
1345 pr_err("%s: cannot get elf header.\n", __func__);
1346 goto out;
1347 }
1348
1349 sec = elf_section_by_name(elf, &ehdr, &shdr,
1350 ".note.gnu.build-id", NULL);
1351 if (sec == NULL) {
1352 sec = elf_section_by_name(elf, &ehdr, &shdr,
1353 ".notes", NULL);
1354 if (sec == NULL)
1355 goto out;
1356 }
1357
1358 data = elf_getdata(sec, NULL);
1359 if (data == NULL)
1360 goto out;
1361
1362 ptr = data->d_buf;
1363 while (ptr < (data->d_buf + data->d_size)) {
1364 GElf_Nhdr *nhdr = ptr;
1365 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1366 descsz = NOTE_ALIGN(nhdr->n_descsz);
1367 const char *name;
1368
1369 ptr += sizeof(*nhdr);
1370 name = ptr;
1371 ptr += namesz;
1372 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1373 nhdr->n_namesz == sizeof("GNU")) {
1374 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1375 memcpy(bf, ptr, BUILD_ID_SIZE);
1376 err = BUILD_ID_SIZE;
1377 break;
1378 }
1379 }
1380 ptr += descsz;
1381 }
1382
1383 out:
1384 return err;
1385 }
1386
1387 int filename__read_build_id(const char *filename, void *bf, size_t size)
1388 {
1389 int fd, err = -1;
1390 Elf *elf;
1391
1392 if (size < BUILD_ID_SIZE)
1393 goto out;
1394
1395 fd = open(filename, O_RDONLY);
1396 if (fd < 0)
1397 goto out;
1398
1399 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1400 if (elf == NULL) {
1401 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1402 goto out_close;
1403 }
1404
1405 err = elf_read_build_id(elf, bf, size);
1406
1407 elf_end(elf);
1408 out_close:
1409 close(fd);
1410 out:
1411 return err;
1412 }
1413
1414 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1415 {
1416 int fd, err = -1;
1417
1418 if (size < BUILD_ID_SIZE)
1419 goto out;
1420
1421 fd = open(filename, O_RDONLY);
1422 if (fd < 0)
1423 goto out;
1424
1425 while (1) {
1426 char bf[BUFSIZ];
1427 GElf_Nhdr nhdr;
1428 int namesz, descsz;
1429
1430 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1431 break;
1432
1433 namesz = NOTE_ALIGN(nhdr.n_namesz);
1434 descsz = NOTE_ALIGN(nhdr.n_descsz);
1435 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1436 nhdr.n_namesz == sizeof("GNU")) {
1437 if (read(fd, bf, namesz) != namesz)
1438 break;
1439 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1440 if (read(fd, build_id,
1441 BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1442 err = 0;
1443 break;
1444 }
1445 } else if (read(fd, bf, descsz) != descsz)
1446 break;
1447 } else {
1448 int n = namesz + descsz;
1449 if (read(fd, bf, n) != n)
1450 break;
1451 }
1452 }
1453 close(fd);
1454 out:
1455 return err;
1456 }
1457
1458 char dso__symtab_origin(const struct dso *dso)
1459 {
1460 static const char origin[] = {
1461 [SYMTAB__KALLSYMS] = 'k',
1462 [SYMTAB__JAVA_JIT] = 'j',
1463 [SYMTAB__BUILD_ID_CACHE] = 'B',
1464 [SYMTAB__FEDORA_DEBUGINFO] = 'f',
1465 [SYMTAB__UBUNTU_DEBUGINFO] = 'u',
1466 [SYMTAB__BUILDID_DEBUGINFO] = 'b',
1467 [SYMTAB__SYSTEM_PATH_DSO] = 'd',
1468 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1469 [SYMTAB__GUEST_KALLSYMS] = 'g',
1470 [SYMTAB__GUEST_KMODULE] = 'G',
1471 };
1472
1473 if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1474 return '!';
1475 return origin[dso->symtab_type];
1476 }
1477
1478 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1479 {
1480 int size = PATH_MAX;
1481 char *name;
1482 int ret = -1;
1483 int fd;
1484 struct machine *machine;
1485 const char *root_dir;
1486 int want_symtab;
1487
1488 dso__set_loaded(dso, map->type);
1489
1490 if (dso->kernel == DSO_TYPE_KERNEL)
1491 return dso__load_kernel_sym(dso, map, filter);
1492 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1493 return dso__load_guest_kernel_sym(dso, map, filter);
1494
1495 if (map->groups && map->groups->machine)
1496 machine = map->groups->machine;
1497 else
1498 machine = NULL;
1499
1500 name = malloc(size);
1501 if (!name)
1502 return -1;
1503
1504 dso->adjust_symbols = 0;
1505
1506 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1507 ret = dso__load_perf_map(dso, map, filter);
1508 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1509 SYMTAB__NOT_FOUND;
1510 return ret;
1511 }
1512
1513 /* Iterate over candidate debug images.
1514 * On the first pass, only load images if they have a full symtab.
1515 * Failing that, do a second pass where we accept .dynsym also
1516 */
1517 want_symtab = 1;
1518 restart:
1519 for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE;
1520 dso->symtab_type != SYMTAB__NOT_FOUND;
1521 dso->symtab_type++) {
1522 switch (dso->symtab_type) {
1523 case SYMTAB__BUILD_ID_CACHE:
1524 /* skip the locally configured cache if a symfs is given */
1525 if (symbol_conf.symfs[0] ||
1526 (dso__build_id_filename(dso, name, size) == NULL)) {
1527 continue;
1528 }
1529 break;
1530 case SYMTAB__FEDORA_DEBUGINFO:
1531 snprintf(name, size, "%s/usr/lib/debug%s.debug",
1532 symbol_conf.symfs, dso->long_name);
1533 break;
1534 case SYMTAB__UBUNTU_DEBUGINFO:
1535 snprintf(name, size, "%s/usr/lib/debug%s",
1536 symbol_conf.symfs, dso->long_name);
1537 break;
1538 case SYMTAB__BUILDID_DEBUGINFO: {
1539 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1540
1541 if (!dso->has_build_id)
1542 continue;
1543
1544 build_id__sprintf(dso->build_id,
1545 sizeof(dso->build_id),
1546 build_id_hex);
1547 snprintf(name, size,
1548 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1549 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1550 }
1551 break;
1552 case SYMTAB__SYSTEM_PATH_DSO:
1553 snprintf(name, size, "%s%s",
1554 symbol_conf.symfs, dso->long_name);
1555 break;
1556 case SYMTAB__GUEST_KMODULE:
1557 if (map->groups && machine)
1558 root_dir = machine->root_dir;
1559 else
1560 root_dir = "";
1561 snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1562 root_dir, dso->long_name);
1563 break;
1564
1565 case SYMTAB__SYSTEM_PATH_KMODULE:
1566 snprintf(name, size, "%s%s", symbol_conf.symfs,
1567 dso->long_name);
1568 break;
1569 default:;
1570 }
1571
1572 /* Name is now the name of the next image to try */
1573 fd = open(name, O_RDONLY);
1574 if (fd < 0)
1575 continue;
1576
1577 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1578 want_symtab);
1579 close(fd);
1580
1581 /*
1582 * Some people seem to have debuginfo files _WITHOUT_ debug
1583 * info!?!?
1584 */
1585 if (!ret)
1586 continue;
1587
1588 if (ret > 0) {
1589 int nr_plt = dso__synthesize_plt_symbols(dso, map,
1590 filter);
1591 if (nr_plt > 0)
1592 ret += nr_plt;
1593 break;
1594 }
1595 }
1596
1597 /*
1598 * If we wanted a full symtab but no image had one,
1599 * relax our requirements and repeat the search.
1600 */
1601 if (ret <= 0 && want_symtab) {
1602 want_symtab = 0;
1603 goto restart;
1604 }
1605
1606 free(name);
1607 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1608 return 0;
1609 return ret;
1610 }
1611
1612 struct map *map_groups__find_by_name(struct map_groups *mg,
1613 enum map_type type, const char *name)
1614 {
1615 struct rb_node *nd;
1616
1617 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1618 struct map *map = rb_entry(nd, struct map, rb_node);
1619
1620 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1621 return map;
1622 }
1623
1624 return NULL;
1625 }
1626
1627 static int dso__kernel_module_get_build_id(struct dso *dso,
1628 const char *root_dir)
1629 {
1630 char filename[PATH_MAX];
1631 /*
1632 * kernel module short names are of the form "[module]" and
1633 * we need just "module" here.
1634 */
1635 const char *name = dso->short_name + 1;
1636
1637 snprintf(filename, sizeof(filename),
1638 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1639 root_dir, (int)strlen(name) - 1, name);
1640
1641 if (sysfs__read_build_id(filename, dso->build_id,
1642 sizeof(dso->build_id)) == 0)
1643 dso->has_build_id = true;
1644
1645 return 0;
1646 }
1647
1648 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1649 const char *dir_name)
1650 {
1651 struct dirent *dent;
1652 DIR *dir = opendir(dir_name);
1653 int ret = 0;
1654
1655 if (!dir) {
1656 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1657 return -1;
1658 }
1659
1660 while ((dent = readdir(dir)) != NULL) {
1661 char path[PATH_MAX];
1662 struct stat st;
1663
1664 /*sshfs might return bad dent->d_type, so we have to stat*/
1665 sprintf(path, "%s/%s", dir_name, dent->d_name);
1666 if (stat(path, &st))
1667 continue;
1668
1669 if (S_ISDIR(st.st_mode)) {
1670 if (!strcmp(dent->d_name, ".") ||
1671 !strcmp(dent->d_name, ".."))
1672 continue;
1673
1674 snprintf(path, sizeof(path), "%s/%s",
1675 dir_name, dent->d_name);
1676 ret = map_groups__set_modules_path_dir(mg, path);
1677 if (ret < 0)
1678 goto out;
1679 } else {
1680 char *dot = strrchr(dent->d_name, '.'),
1681 dso_name[PATH_MAX];
1682 struct map *map;
1683 char *long_name;
1684
1685 if (dot == NULL || strcmp(dot, ".ko"))
1686 continue;
1687 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1688 (int)(dot - dent->d_name), dent->d_name);
1689
1690 strxfrchar(dso_name, '-', '_');
1691 map = map_groups__find_by_name(mg, MAP__FUNCTION,
1692 dso_name);
1693 if (map == NULL)
1694 continue;
1695
1696 snprintf(path, sizeof(path), "%s/%s",
1697 dir_name, dent->d_name);
1698
1699 long_name = strdup(path);
1700 if (long_name == NULL) {
1701 ret = -1;
1702 goto out;
1703 }
1704 dso__set_long_name(map->dso, long_name);
1705 map->dso->lname_alloc = 1;
1706 dso__kernel_module_get_build_id(map->dso, "");
1707 }
1708 }
1709
1710 out:
1711 closedir(dir);
1712 return ret;
1713 }
1714
1715 static char *get_kernel_version(const char *root_dir)
1716 {
1717 char version[PATH_MAX];
1718 FILE *file;
1719 char *name, *tmp;
1720 const char *prefix = "Linux version ";
1721
1722 sprintf(version, "%s/proc/version", root_dir);
1723 file = fopen(version, "r");
1724 if (!file)
1725 return NULL;
1726
1727 version[0] = '\0';
1728 tmp = fgets(version, sizeof(version), file);
1729 fclose(file);
1730
1731 name = strstr(version, prefix);
1732 if (!name)
1733 return NULL;
1734 name += strlen(prefix);
1735 tmp = strchr(name, ' ');
1736 if (tmp)
1737 *tmp = '\0';
1738
1739 return strdup(name);
1740 }
1741
1742 static int machine__set_modules_path(struct machine *machine)
1743 {
1744 char *version;
1745 char modules_path[PATH_MAX];
1746
1747 version = get_kernel_version(machine->root_dir);
1748 if (!version)
1749 return -1;
1750
1751 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1752 machine->root_dir, version);
1753 free(version);
1754
1755 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1756 }
1757
1758 /*
1759 * Constructor variant for modules (where we know from /proc/modules where
1760 * they are loaded) and for vmlinux, where only after we load all the
1761 * symbols we'll know where it starts and ends.
1762 */
1763 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1764 {
1765 struct map *map = calloc(1, (sizeof(*map) +
1766 (dso->kernel ? sizeof(struct kmap) : 0)));
1767 if (map != NULL) {
1768 /*
1769 * ->end will be filled after we load all the symbols
1770 */
1771 map__init(map, type, start, 0, 0, dso);
1772 }
1773
1774 return map;
1775 }
1776
1777 struct map *machine__new_module(struct machine *machine, u64 start,
1778 const char *filename)
1779 {
1780 struct map *map;
1781 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
1782
1783 if (dso == NULL)
1784 return NULL;
1785
1786 map = map__new2(start, dso, MAP__FUNCTION);
1787 if (map == NULL)
1788 return NULL;
1789
1790 if (machine__is_host(machine))
1791 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1792 else
1793 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1794 map_groups__insert(&machine->kmaps, map);
1795 return map;
1796 }
1797
1798 static int machine__create_modules(struct machine *machine)
1799 {
1800 char *line = NULL;
1801 size_t n;
1802 FILE *file;
1803 struct map *map;
1804 const char *modules;
1805 char path[PATH_MAX];
1806
1807 if (machine__is_default_guest(machine))
1808 modules = symbol_conf.default_guest_modules;
1809 else {
1810 sprintf(path, "%s/proc/modules", machine->root_dir);
1811 modules = path;
1812 }
1813
1814 if (symbol__restricted_filename(path, "/proc/modules"))
1815 return -1;
1816
1817 file = fopen(modules, "r");
1818 if (file == NULL)
1819 return -1;
1820
1821 while (!feof(file)) {
1822 char name[PATH_MAX];
1823 u64 start;
1824 char *sep;
1825 int line_len;
1826
1827 line_len = getline(&line, &n, file);
1828 if (line_len < 0)
1829 break;
1830
1831 if (!line)
1832 goto out_failure;
1833
1834 line[--line_len] = '\0'; /* \n */
1835
1836 sep = strrchr(line, 'x');
1837 if (sep == NULL)
1838 continue;
1839
1840 hex2u64(sep + 1, &start);
1841
1842 sep = strchr(line, ' ');
1843 if (sep == NULL)
1844 continue;
1845
1846 *sep = '\0';
1847
1848 snprintf(name, sizeof(name), "[%s]", line);
1849 map = machine__new_module(machine, start, name);
1850 if (map == NULL)
1851 goto out_delete_line;
1852 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1853 }
1854
1855 free(line);
1856 fclose(file);
1857
1858 return machine__set_modules_path(machine);
1859
1860 out_delete_line:
1861 free(line);
1862 out_failure:
1863 return -1;
1864 }
1865
1866 int dso__load_vmlinux(struct dso *dso, struct map *map,
1867 const char *vmlinux, symbol_filter_t filter)
1868 {
1869 int err = -1, fd;
1870 char symfs_vmlinux[PATH_MAX];
1871
1872 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1873 symbol_conf.symfs, vmlinux);
1874 fd = open(symfs_vmlinux, O_RDONLY);
1875 if (fd < 0)
1876 return -1;
1877
1878 dso__set_long_name(dso, (char *)vmlinux);
1879 dso__set_loaded(dso, map->type);
1880 err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
1881 close(fd);
1882
1883 if (err > 0)
1884 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1885
1886 return err;
1887 }
1888
1889 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1890 symbol_filter_t filter)
1891 {
1892 int i, err = 0;
1893 char *filename;
1894
1895 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1896 vmlinux_path__nr_entries + 1);
1897
1898 filename = dso__build_id_filename(dso, NULL, 0);
1899 if (filename != NULL) {
1900 err = dso__load_vmlinux(dso, map, filename, filter);
1901 if (err > 0) {
1902 dso__set_long_name(dso, filename);
1903 goto out;
1904 }
1905 free(filename);
1906 }
1907
1908 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1909 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
1910 if (err > 0) {
1911 dso__set_long_name(dso, strdup(vmlinux_path[i]));
1912 break;
1913 }
1914 }
1915 out:
1916 return err;
1917 }
1918
1919 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1920 symbol_filter_t filter)
1921 {
1922 int err;
1923 const char *kallsyms_filename = NULL;
1924 char *kallsyms_allocated_filename = NULL;
1925 /*
1926 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1927 * it and only it, reporting errors to the user if it cannot be used.
1928 *
1929 * For instance, try to analyse an ARM perf.data file _without_ a
1930 * build-id, or if the user specifies the wrong path to the right
1931 * vmlinux file, obviously we can't fallback to another vmlinux (a
1932 * x86_86 one, on the machine where analysis is being performed, say),
1933 * or worse, /proc/kallsyms.
1934 *
1935 * If the specified file _has_ a build-id and there is a build-id
1936 * section in the perf.data file, we will still do the expected
1937 * validation in dso__load_vmlinux and will bail out if they don't
1938 * match.
1939 */
1940 if (symbol_conf.kallsyms_name != NULL) {
1941 kallsyms_filename = symbol_conf.kallsyms_name;
1942 goto do_kallsyms;
1943 }
1944
1945 if (symbol_conf.vmlinux_name != NULL) {
1946 err = dso__load_vmlinux(dso, map,
1947 symbol_conf.vmlinux_name, filter);
1948 if (err > 0) {
1949 dso__set_long_name(dso,
1950 strdup(symbol_conf.vmlinux_name));
1951 goto out_fixup;
1952 }
1953 return err;
1954 }
1955
1956 if (vmlinux_path != NULL) {
1957 err = dso__load_vmlinux_path(dso, map, filter);
1958 if (err > 0)
1959 goto out_fixup;
1960 }
1961
1962 /* do not try local files if a symfs was given */
1963 if (symbol_conf.symfs[0] != 0)
1964 return -1;
1965
1966 /*
1967 * Say the kernel DSO was created when processing the build-id header table,
1968 * we have a build-id, so check if it is the same as the running kernel,
1969 * using it if it is.
1970 */
1971 if (dso->has_build_id) {
1972 u8 kallsyms_build_id[BUILD_ID_SIZE];
1973 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1974
1975 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1976 sizeof(kallsyms_build_id)) == 0) {
1977 if (dso__build_id_equal(dso, kallsyms_build_id)) {
1978 kallsyms_filename = "/proc/kallsyms";
1979 goto do_kallsyms;
1980 }
1981 }
1982 /*
1983 * Now look if we have it on the build-id cache in
1984 * $HOME/.debug/[kernel.kallsyms].
1985 */
1986 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1987 sbuild_id);
1988
1989 if (asprintf(&kallsyms_allocated_filename,
1990 "%s/.debug/[kernel.kallsyms]/%s",
1991 getenv("HOME"), sbuild_id) == -1) {
1992 pr_err("Not enough memory for kallsyms file lookup\n");
1993 return -1;
1994 }
1995
1996 kallsyms_filename = kallsyms_allocated_filename;
1997
1998 if (access(kallsyms_filename, F_OK)) {
1999 pr_err("No kallsyms or vmlinux with build-id %s "
2000 "was found\n", sbuild_id);
2001 free(kallsyms_allocated_filename);
2002 return -1;
2003 }
2004 } else {
2005 /*
2006 * Last resort, if we don't have a build-id and couldn't find
2007 * any vmlinux file, try the running kernel kallsyms table.
2008 */
2009 kallsyms_filename = "/proc/kallsyms";
2010 }
2011
2012 do_kallsyms:
2013 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2014 if (err > 0)
2015 pr_debug("Using %s for symbols\n", kallsyms_filename);
2016 free(kallsyms_allocated_filename);
2017
2018 if (err > 0) {
2019 out_fixup:
2020 if (kallsyms_filename != NULL)
2021 dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2022 map__fixup_start(map);
2023 map__fixup_end(map);
2024 }
2025
2026 return err;
2027 }
2028
2029 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2030 symbol_filter_t filter)
2031 {
2032 int err;
2033 const char *kallsyms_filename = NULL;
2034 struct machine *machine;
2035 char path[PATH_MAX];
2036
2037 if (!map->groups) {
2038 pr_debug("Guest kernel map hasn't the point to groups\n");
2039 return -1;
2040 }
2041 machine = map->groups->machine;
2042
2043 if (machine__is_default_guest(machine)) {
2044 /*
2045 * if the user specified a vmlinux filename, use it and only
2046 * it, reporting errors to the user if it cannot be used.
2047 * Or use file guest_kallsyms inputted by user on commandline
2048 */
2049 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2050 err = dso__load_vmlinux(dso, map,
2051 symbol_conf.default_guest_vmlinux_name, filter);
2052 goto out_try_fixup;
2053 }
2054
2055 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2056 if (!kallsyms_filename)
2057 return -1;
2058 } else {
2059 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2060 kallsyms_filename = path;
2061 }
2062
2063 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2064 if (err > 0)
2065 pr_debug("Using %s for symbols\n", kallsyms_filename);
2066
2067 out_try_fixup:
2068 if (err > 0) {
2069 if (kallsyms_filename != NULL) {
2070 machine__mmap_name(machine, path, sizeof(path));
2071 dso__set_long_name(dso, strdup(path));
2072 }
2073 map__fixup_start(map);
2074 map__fixup_end(map);
2075 }
2076
2077 return err;
2078 }
2079
2080 static void dsos__add(struct list_head *head, struct dso *dso)
2081 {
2082 list_add_tail(&dso->node, head);
2083 }
2084
2085 static struct dso *dsos__find(struct list_head *head, const char *name)
2086 {
2087 struct dso *pos;
2088
2089 list_for_each_entry(pos, head, node)
2090 if (strcmp(pos->long_name, name) == 0)
2091 return pos;
2092 return NULL;
2093 }
2094
2095 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2096 {
2097 struct dso *dso = dsos__find(head, name);
2098
2099 if (!dso) {
2100 dso = dso__new(name);
2101 if (dso != NULL) {
2102 dsos__add(head, dso);
2103 dso__set_basename(dso);
2104 }
2105 }
2106
2107 return dso;
2108 }
2109
2110 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2111 {
2112 struct dso *pos;
2113 size_t ret = 0;
2114
2115 list_for_each_entry(pos, head, node) {
2116 int i;
2117 for (i = 0; i < MAP__NR_TYPES; ++i)
2118 ret += dso__fprintf(pos, i, fp);
2119 }
2120
2121 return ret;
2122 }
2123
2124 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2125 {
2126 struct rb_node *nd;
2127 size_t ret = 0;
2128
2129 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2130 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2131 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2132 ret += __dsos__fprintf(&pos->user_dsos, fp);
2133 }
2134
2135 return ret;
2136 }
2137
2138 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2139 bool with_hits)
2140 {
2141 struct dso *pos;
2142 size_t ret = 0;
2143
2144 list_for_each_entry(pos, head, node) {
2145 if (with_hits && !pos->hit)
2146 continue;
2147 ret += dso__fprintf_buildid(pos, fp);
2148 ret += fprintf(fp, " %s\n", pos->long_name);
2149 }
2150 return ret;
2151 }
2152
2153 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2154 bool with_hits)
2155 {
2156 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2157 __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2158 }
2159
2160 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2161 FILE *fp, bool with_hits)
2162 {
2163 struct rb_node *nd;
2164 size_t ret = 0;
2165
2166 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2167 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2168 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2169 }
2170 return ret;
2171 }
2172
2173 struct dso *dso__new_kernel(const char *name)
2174 {
2175 struct dso *dso = dso__new(name ?: "[kernel.kallsyms]");
2176
2177 if (dso != NULL) {
2178 dso__set_short_name(dso, "[kernel]");
2179 dso->kernel = DSO_TYPE_KERNEL;
2180 }
2181
2182 return dso;
2183 }
2184
2185 static struct dso *dso__new_guest_kernel(struct machine *machine,
2186 const char *name)
2187 {
2188 char bf[PATH_MAX];
2189 struct dso *dso = dso__new(name ?: machine__mmap_name(machine, bf,
2190 sizeof(bf)));
2191 if (dso != NULL) {
2192 dso__set_short_name(dso, "[guest.kernel]");
2193 dso->kernel = DSO_TYPE_GUEST_KERNEL;
2194 }
2195
2196 return dso;
2197 }
2198
2199 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2200 {
2201 char path[PATH_MAX];
2202
2203 if (machine__is_default_guest(machine))
2204 return;
2205 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2206 if (sysfs__read_build_id(path, dso->build_id,
2207 sizeof(dso->build_id)) == 0)
2208 dso->has_build_id = true;
2209 }
2210
2211 static struct dso *machine__create_kernel(struct machine *machine)
2212 {
2213 const char *vmlinux_name = NULL;
2214 struct dso *kernel;
2215
2216 if (machine__is_host(machine)) {
2217 vmlinux_name = symbol_conf.vmlinux_name;
2218 kernel = dso__new_kernel(vmlinux_name);
2219 } else {
2220 if (machine__is_default_guest(machine))
2221 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2222 kernel = dso__new_guest_kernel(machine, vmlinux_name);
2223 }
2224
2225 if (kernel != NULL) {
2226 dso__read_running_kernel_build_id(kernel, machine);
2227 dsos__add(&machine->kernel_dsos, kernel);
2228 }
2229 return kernel;
2230 }
2231
2232 struct process_args {
2233 u64 start;
2234 };
2235
2236 static int symbol__in_kernel(void *arg, const char *name,
2237 char type __used, u64 start, u64 end __used)
2238 {
2239 struct process_args *args = arg;
2240
2241 if (strchr(name, '['))
2242 return 0;
2243
2244 args->start = start;
2245 return 1;
2246 }
2247
2248 /* Figure out the start address of kernel map from /proc/kallsyms */
2249 static u64 machine__get_kernel_start_addr(struct machine *machine)
2250 {
2251 const char *filename;
2252 char path[PATH_MAX];
2253 struct process_args args;
2254
2255 if (machine__is_host(machine)) {
2256 filename = "/proc/kallsyms";
2257 } else {
2258 if (machine__is_default_guest(machine))
2259 filename = (char *)symbol_conf.default_guest_kallsyms;
2260 else {
2261 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2262 filename = path;
2263 }
2264 }
2265
2266 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2267 return 0;
2268
2269 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2270 return 0;
2271
2272 return args.start;
2273 }
2274
2275 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2276 {
2277 enum map_type type;
2278 u64 start = machine__get_kernel_start_addr(machine);
2279
2280 for (type = 0; type < MAP__NR_TYPES; ++type) {
2281 struct kmap *kmap;
2282
2283 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2284 if (machine->vmlinux_maps[type] == NULL)
2285 return -1;
2286
2287 machine->vmlinux_maps[type]->map_ip =
2288 machine->vmlinux_maps[type]->unmap_ip =
2289 identity__map_ip;
2290 kmap = map__kmap(machine->vmlinux_maps[type]);
2291 kmap->kmaps = &machine->kmaps;
2292 map_groups__insert(&machine->kmaps,
2293 machine->vmlinux_maps[type]);
2294 }
2295
2296 return 0;
2297 }
2298
2299 void machine__destroy_kernel_maps(struct machine *machine)
2300 {
2301 enum map_type type;
2302
2303 for (type = 0; type < MAP__NR_TYPES; ++type) {
2304 struct kmap *kmap;
2305
2306 if (machine->vmlinux_maps[type] == NULL)
2307 continue;
2308
2309 kmap = map__kmap(machine->vmlinux_maps[type]);
2310 map_groups__remove(&machine->kmaps,
2311 machine->vmlinux_maps[type]);
2312 if (kmap->ref_reloc_sym) {
2313 /*
2314 * ref_reloc_sym is shared among all maps, so free just
2315 * on one of them.
2316 */
2317 if (type == MAP__FUNCTION) {
2318 free((char *)kmap->ref_reloc_sym->name);
2319 kmap->ref_reloc_sym->name = NULL;
2320 free(kmap->ref_reloc_sym);
2321 }
2322 kmap->ref_reloc_sym = NULL;
2323 }
2324
2325 map__delete(machine->vmlinux_maps[type]);
2326 machine->vmlinux_maps[type] = NULL;
2327 }
2328 }
2329
2330 int machine__create_kernel_maps(struct machine *machine)
2331 {
2332 struct dso *kernel = machine__create_kernel(machine);
2333
2334 if (kernel == NULL ||
2335 __machine__create_kernel_maps(machine, kernel) < 0)
2336 return -1;
2337
2338 if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2339 pr_debug("Problems creating module maps, continuing anyway...\n");
2340 /*
2341 * Now that we have all the maps created, just set the ->end of them:
2342 */
2343 map_groups__fixup_end(&machine->kmaps);
2344 return 0;
2345 }
2346
2347 static void vmlinux_path__exit(void)
2348 {
2349 while (--vmlinux_path__nr_entries >= 0) {
2350 free(vmlinux_path[vmlinux_path__nr_entries]);
2351 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2352 }
2353
2354 free(vmlinux_path);
2355 vmlinux_path = NULL;
2356 }
2357
2358 static int vmlinux_path__init(void)
2359 {
2360 struct utsname uts;
2361 char bf[PATH_MAX];
2362
2363 vmlinux_path = malloc(sizeof(char *) * 5);
2364 if (vmlinux_path == NULL)
2365 return -1;
2366
2367 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2368 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2369 goto out_fail;
2370 ++vmlinux_path__nr_entries;
2371 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2372 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2373 goto out_fail;
2374 ++vmlinux_path__nr_entries;
2375
2376 /* only try running kernel version if no symfs was given */
2377 if (symbol_conf.symfs[0] != 0)
2378 return 0;
2379
2380 if (uname(&uts) < 0)
2381 return -1;
2382
2383 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2384 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2385 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2386 goto out_fail;
2387 ++vmlinux_path__nr_entries;
2388 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2389 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2390 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2391 goto out_fail;
2392 ++vmlinux_path__nr_entries;
2393 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2394 uts.release);
2395 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2396 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2397 goto out_fail;
2398 ++vmlinux_path__nr_entries;
2399
2400 return 0;
2401
2402 out_fail:
2403 vmlinux_path__exit();
2404 return -1;
2405 }
2406
2407 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2408 {
2409 int i;
2410 size_t printed = 0;
2411 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2412
2413 if (kdso->has_build_id) {
2414 char filename[PATH_MAX];
2415 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2416 printed += fprintf(fp, "[0] %s\n", filename);
2417 }
2418
2419 for (i = 0; i < vmlinux_path__nr_entries; ++i)
2420 printed += fprintf(fp, "[%d] %s\n",
2421 i + kdso->has_build_id, vmlinux_path[i]);
2422
2423 return printed;
2424 }
2425
2426 static int setup_list(struct strlist **list, const char *list_str,
2427 const char *list_name)
2428 {
2429 if (list_str == NULL)
2430 return 0;
2431
2432 *list = strlist__new(true, list_str);
2433 if (!*list) {
2434 pr_err("problems parsing %s list\n", list_name);
2435 return -1;
2436 }
2437 return 0;
2438 }
2439
2440 static bool symbol__read_kptr_restrict(void)
2441 {
2442 bool value = false;
2443
2444 if (geteuid() != 0) {
2445 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2446 if (fp != NULL) {
2447 char line[8];
2448
2449 if (fgets(line, sizeof(line), fp) != NULL)
2450 value = atoi(line) != 0;
2451
2452 fclose(fp);
2453 }
2454 }
2455
2456 return value;
2457 }
2458
2459 int symbol__init(void)
2460 {
2461 const char *symfs;
2462
2463 if (symbol_conf.initialized)
2464 return 0;
2465
2466 symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2467
2468 elf_version(EV_CURRENT);
2469 if (symbol_conf.sort_by_name)
2470 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2471 sizeof(struct symbol));
2472
2473 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2474 return -1;
2475
2476 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2477 pr_err("'.' is the only non valid --field-separator argument\n");
2478 return -1;
2479 }
2480
2481 if (setup_list(&symbol_conf.dso_list,
2482 symbol_conf.dso_list_str, "dso") < 0)
2483 return -1;
2484
2485 if (setup_list(&symbol_conf.comm_list,
2486 symbol_conf.comm_list_str, "comm") < 0)
2487 goto out_free_dso_list;
2488
2489 if (setup_list(&symbol_conf.sym_list,
2490 symbol_conf.sym_list_str, "symbol") < 0)
2491 goto out_free_comm_list;
2492
2493 /*
2494 * A path to symbols of "/" is identical to ""
2495 * reset here for simplicity.
2496 */
2497 symfs = realpath(symbol_conf.symfs, NULL);
2498 if (symfs == NULL)
2499 symfs = symbol_conf.symfs;
2500 if (strcmp(symfs, "/") == 0)
2501 symbol_conf.symfs = "";
2502 if (symfs != symbol_conf.symfs)
2503 free((void *)symfs);
2504
2505 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2506
2507 symbol_conf.initialized = true;
2508 return 0;
2509
2510 out_free_dso_list:
2511 strlist__delete(symbol_conf.dso_list);
2512 out_free_comm_list:
2513 strlist__delete(symbol_conf.comm_list);
2514 return -1;
2515 }
2516
2517 void symbol__exit(void)
2518 {
2519 if (!symbol_conf.initialized)
2520 return;
2521 strlist__delete(symbol_conf.sym_list);
2522 strlist__delete(symbol_conf.dso_list);
2523 strlist__delete(symbol_conf.comm_list);
2524 vmlinux_path__exit();
2525 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2526 symbol_conf.initialized = false;
2527 }
2528
2529 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2530 {
2531 struct machine *machine = machines__findnew(machines, pid);
2532
2533 if (machine == NULL)
2534 return -1;
2535
2536 return machine__create_kernel_maps(machine);
2537 }
2538
2539 static int hex(char ch)
2540 {
2541 if ((ch >= '0') && (ch <= '9'))
2542 return ch - '0';
2543 if ((ch >= 'a') && (ch <= 'f'))
2544 return ch - 'a' + 10;
2545 if ((ch >= 'A') && (ch <= 'F'))
2546 return ch - 'A' + 10;
2547 return -1;
2548 }
2549
2550 /*
2551 * While we find nice hex chars, build a long_val.
2552 * Return number of chars processed.
2553 */
2554 int hex2u64(const char *ptr, u64 *long_val)
2555 {
2556 const char *p = ptr;
2557 *long_val = 0;
2558
2559 while (*p) {
2560 const int hex_val = hex(*p);
2561
2562 if (hex_val < 0)
2563 break;
2564
2565 *long_val = (*long_val << 4) | hex_val;
2566 p++;
2567 }
2568
2569 return p - ptr;
2570 }
2571
2572 char *strxfrchar(char *s, char from, char to)
2573 {
2574 char *p = s;
2575
2576 while ((p = strchr(p, from)) != NULL)
2577 *p++ = to;
2578
2579 return s;
2580 }
2581
2582 int machines__create_guest_kernel_maps(struct rb_root *machines)
2583 {
2584 int ret = 0;
2585 struct dirent **namelist = NULL;
2586 int i, items = 0;
2587 char path[PATH_MAX];
2588 pid_t pid;
2589
2590 if (symbol_conf.default_guest_vmlinux_name ||
2591 symbol_conf.default_guest_modules ||
2592 symbol_conf.default_guest_kallsyms) {
2593 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2594 }
2595
2596 if (symbol_conf.guestmount) {
2597 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2598 if (items <= 0)
2599 return -ENOENT;
2600 for (i = 0; i < items; i++) {
2601 if (!isdigit(namelist[i]->d_name[0])) {
2602 /* Filter out . and .. */
2603 continue;
2604 }
2605 pid = atoi(namelist[i]->d_name);
2606 sprintf(path, "%s/%s/proc/kallsyms",
2607 symbol_conf.guestmount,
2608 namelist[i]->d_name);
2609 ret = access(path, R_OK);
2610 if (ret) {
2611 pr_debug("Can't access file %s\n", path);
2612 goto failure;
2613 }
2614 machines__create_kernel_maps(machines, pid);
2615 }
2616 failure:
2617 free(namelist);
2618 }
2619
2620 return ret;
2621 }
2622
2623 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2624 {
2625 struct rb_node *next = rb_first(machines);
2626
2627 while (next) {
2628 struct machine *pos = rb_entry(next, struct machine, rb_node);
2629
2630 next = rb_next(&pos->rb_node);
2631 rb_erase(&pos->rb_node, machines);
2632 machine__delete(pos);
2633 }
2634 }
2635
2636 int machine__load_kallsyms(struct machine *machine, const char *filename,
2637 enum map_type type, symbol_filter_t filter)
2638 {
2639 struct map *map = machine->vmlinux_maps[type];
2640 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2641
2642 if (ret > 0) {
2643 dso__set_loaded(map->dso, type);
2644 /*
2645 * Since /proc/kallsyms will have multiple sessions for the
2646 * kernel, with modules between them, fixup the end of all
2647 * sections.
2648 */
2649 __map_groups__fixup_end(&machine->kmaps, type);
2650 }
2651
2652 return ret;
2653 }
2654
2655 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2656 symbol_filter_t filter)
2657 {
2658 struct map *map = machine->vmlinux_maps[type];
2659 int ret = dso__load_vmlinux_path(map->dso, map, filter);
2660
2661 if (ret > 0) {
2662 dso__set_loaded(map->dso, type);
2663 map__reloc_vmlinux(map);
2664 }
2665
2666 return ret;
2667 }
linux-next