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