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[mirror_ubuntu-eoan-kernel.git] / tools / perf / util / symbol.c
1 #include "util.h"
2 #include "../perf.h"
3 #include "string.h"
4 #include "symbol.h"
5 #include "thread.h"
6
7 #include "debug.h"
8
9 #include <asm/bug.h>
10 #include <libelf.h>
11 #include <gelf.h>
12 #include <elf.h>
13 #include <limits.h>
14 #include <sys/utsname.h>
15
16 #ifndef NT_GNU_BUILD_ID
17 #define NT_GNU_BUILD_ID 3
18 #endif
19
20 enum dso_origin {
21 DSO__ORIG_KERNEL = 0,
22 DSO__ORIG_JAVA_JIT,
23 DSO__ORIG_FEDORA,
24 DSO__ORIG_UBUNTU,
25 DSO__ORIG_BUILDID,
26 DSO__ORIG_DSO,
27 DSO__ORIG_KMODULE,
28 DSO__ORIG_NOT_FOUND,
29 };
30
31 static void dsos__add(struct list_head *head, struct dso *dso);
32 static struct map *map__new2(u64 start, struct dso *dso);
33 static void kernel_maps__insert(struct map *map);
34 static int dso__load_kernel_sym(struct dso *self, struct map *map,
35 symbol_filter_t filter);
36 unsigned int symbol__priv_size;
37 static int vmlinux_path__nr_entries;
38 static char **vmlinux_path;
39
40 static struct symbol_conf symbol_conf__defaults = {
41 .use_modules = true,
42 .try_vmlinux_path = true,
43 };
44
45 static struct rb_root kernel_maps__functions;
46
47 static void symbols__fixup_end(struct rb_root *self)
48 {
49 struct rb_node *nd, *prevnd = rb_first(self);
50 struct symbol *curr, *prev;
51
52 if (prevnd == NULL)
53 return;
54
55 curr = rb_entry(prevnd, struct symbol, rb_node);
56
57 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
58 prev = curr;
59 curr = rb_entry(nd, struct symbol, rb_node);
60
61 if (prev->end == prev->start)
62 prev->end = curr->start - 1;
63 }
64
65 /* Last entry */
66 if (curr->end == curr->start)
67 curr->end = roundup(curr->start, 4096);
68 }
69
70 static void kernel_maps__fixup_end(void)
71 {
72 struct map *prev, *curr;
73 struct rb_node *nd, *prevnd = rb_first(&kernel_maps__functions);
74
75 if (prevnd == NULL)
76 return;
77
78 curr = rb_entry(prevnd, struct map, rb_node);
79
80 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
81 prev = curr;
82 curr = rb_entry(nd, struct map, rb_node);
83 prev->end = curr->start - 1;
84 }
85
86 /*
87 * We still haven't the actual symbols, so guess the
88 * last map final address.
89 */
90 curr->end = ~0UL;
91 }
92
93 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
94 {
95 size_t namelen = strlen(name) + 1;
96 struct symbol *self = zalloc(symbol__priv_size +
97 sizeof(*self) + namelen);
98 if (self == NULL)
99 return NULL;
100
101 if (symbol__priv_size)
102 self = ((void *)self) + symbol__priv_size;
103
104 self->start = start;
105 self->end = len ? start + len - 1 : start;
106
107 pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
108
109 memcpy(self->name, name, namelen);
110
111 return self;
112 }
113
114 static void symbol__delete(struct symbol *self)
115 {
116 free(((void *)self) - symbol__priv_size);
117 }
118
119 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
120 {
121 return fprintf(fp, " %llx-%llx %s\n",
122 self->start, self->end, self->name);
123 }
124
125 static void dso__set_long_name(struct dso *self, char *name)
126 {
127 if (name == NULL)
128 return;
129 self->long_name = name;
130 self->long_name_len = strlen(name);
131 }
132
133 static void dso__set_basename(struct dso *self)
134 {
135 self->short_name = basename(self->long_name);
136 }
137
138 struct dso *dso__new(const char *name)
139 {
140 struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
141
142 if (self != NULL) {
143 strcpy(self->name, name);
144 dso__set_long_name(self, self->name);
145 self->short_name = self->name;
146 self->functions = RB_ROOT;
147 self->find_function = dso__find_function;
148 self->slen_calculated = 0;
149 self->origin = DSO__ORIG_NOT_FOUND;
150 self->loaded = 0;
151 self->has_build_id = 0;
152 }
153
154 return self;
155 }
156
157 static void symbols__delete(struct rb_root *self)
158 {
159 struct symbol *pos;
160 struct rb_node *next = rb_first(self);
161
162 while (next) {
163 pos = rb_entry(next, struct symbol, rb_node);
164 next = rb_next(&pos->rb_node);
165 rb_erase(&pos->rb_node, self);
166 symbol__delete(pos);
167 }
168 }
169
170 void dso__delete(struct dso *self)
171 {
172 symbols__delete(&self->functions);
173 if (self->long_name != self->name)
174 free(self->long_name);
175 free(self);
176 }
177
178 void dso__set_build_id(struct dso *self, void *build_id)
179 {
180 memcpy(self->build_id, build_id, sizeof(self->build_id));
181 self->has_build_id = 1;
182 }
183
184 static void symbols__insert(struct rb_root *self, struct symbol *sym)
185 {
186 struct rb_node **p = &self->rb_node;
187 struct rb_node *parent = NULL;
188 const u64 ip = sym->start;
189 struct symbol *s;
190
191 while (*p != NULL) {
192 parent = *p;
193 s = rb_entry(parent, struct symbol, rb_node);
194 if (ip < s->start)
195 p = &(*p)->rb_left;
196 else
197 p = &(*p)->rb_right;
198 }
199 rb_link_node(&sym->rb_node, parent, p);
200 rb_insert_color(&sym->rb_node, self);
201 }
202
203 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
204 {
205 struct rb_node *n;
206
207 if (self == NULL)
208 return NULL;
209
210 n = self->rb_node;
211
212 while (n) {
213 struct symbol *s = rb_entry(n, struct symbol, rb_node);
214
215 if (ip < s->start)
216 n = n->rb_left;
217 else if (ip > s->end)
218 n = n->rb_right;
219 else
220 return s;
221 }
222
223 return NULL;
224 }
225
226 struct symbol *dso__find_function(struct dso *self, u64 ip)
227 {
228 return symbols__find(&self->functions, ip);
229 }
230
231 int build_id__sprintf(u8 *self, int len, char *bf)
232 {
233 char *bid = bf;
234 u8 *raw = self;
235 int i;
236
237 for (i = 0; i < len; ++i) {
238 sprintf(bid, "%02x", *raw);
239 ++raw;
240 bid += 2;
241 }
242
243 return raw - self;
244 }
245
246 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
247 {
248 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
249
250 build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
251 return fprintf(fp, "%s", sbuild_id);
252 }
253
254 size_t dso__fprintf(struct dso *self, FILE *fp)
255 {
256 struct rb_node *nd;
257 size_t ret = fprintf(fp, "dso: %s (", self->short_name);
258
259 ret += dso__fprintf_buildid(self, fp);
260 ret += fprintf(fp, ")\nFunctions:\n");
261
262 for (nd = rb_first(&self->functions); nd; nd = rb_next(nd)) {
263 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
264 ret += symbol__fprintf(pos, fp);
265 }
266
267 return ret;
268 }
269
270 /*
271 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
272 * so that we can in the next step set the symbol ->end address and then
273 * call kernel_maps__split_kallsyms.
274 */
275 static int kernel_maps__load_all_kallsyms(void)
276 {
277 char *line = NULL;
278 size_t n;
279 FILE *file = fopen("/proc/kallsyms", "r");
280
281 if (file == NULL)
282 goto out_failure;
283
284 while (!feof(file)) {
285 u64 start;
286 struct symbol *sym;
287 int line_len, len;
288 char symbol_type;
289 char *symbol_name;
290
291 line_len = getline(&line, &n, file);
292 if (line_len < 0)
293 break;
294
295 if (!line)
296 goto out_failure;
297
298 line[--line_len] = '\0'; /* \n */
299
300 len = hex2u64(line, &start);
301
302 len++;
303 if (len + 2 >= line_len)
304 continue;
305
306 symbol_type = toupper(line[len]);
307 /*
308 * We're interested only in code ('T'ext)
309 */
310 if (symbol_type != 'T' && symbol_type != 'W')
311 continue;
312
313 symbol_name = line + len + 2;
314 /*
315 * Will fix up the end later, when we have all symbols sorted.
316 */
317 sym = symbol__new(start, 0, symbol_name);
318
319 if (sym == NULL)
320 goto out_delete_line;
321
322 /*
323 * We will pass the symbols to the filter later, in
324 * kernel_maps__split_kallsyms, when we have split the
325 * maps per module
326 */
327 symbols__insert(&kernel_map__functions->dso->functions, sym);
328 }
329
330 free(line);
331 fclose(file);
332
333 return 0;
334
335 out_delete_line:
336 free(line);
337 out_failure:
338 return -1;
339 }
340
341 /*
342 * Split the symbols into maps, making sure there are no overlaps, i.e. the
343 * kernel range is broken in several maps, named [kernel].N, as we don't have
344 * the original ELF section names vmlinux have.
345 */
346 static int kernel_maps__split_kallsyms(symbol_filter_t filter)
347 {
348 struct map *map = kernel_map__functions;
349 struct symbol *pos;
350 int count = 0;
351 struct rb_node *next = rb_first(&kernel_map__functions->dso->functions);
352 int kernel_range = 0;
353
354 while (next) {
355 char *module;
356
357 pos = rb_entry(next, struct symbol, rb_node);
358 next = rb_next(&pos->rb_node);
359
360 module = strchr(pos->name, '\t');
361 if (module) {
362 *module++ = '\0';
363
364 if (strcmp(map->dso->name, module)) {
365 map = kernel_maps__find_by_dso_name(module);
366 if (!map) {
367 pr_err("/proc/{kallsyms,modules} "
368 "inconsistency!\n");
369 return -1;
370 }
371 }
372 /*
373 * So that we look just like we get from .ko files,
374 * i.e. not prelinked, relative to map->start.
375 */
376 pos->start = map->map_ip(map, pos->start);
377 pos->end = map->map_ip(map, pos->end);
378 } else if (map != kernel_map__functions) {
379 char dso_name[PATH_MAX];
380 struct dso *dso;
381
382 snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
383 kernel_range++);
384
385 dso = dso__new(dso_name);
386 if (dso == NULL)
387 return -1;
388
389 map = map__new2(pos->start, dso);
390 if (map == NULL) {
391 dso__delete(dso);
392 return -1;
393 }
394
395 map->map_ip = map->unmap_ip = identity__map_ip;
396 kernel_maps__insert(map);
397 ++kernel_range;
398 }
399
400 if (filter && filter(map, pos)) {
401 rb_erase(&pos->rb_node, &kernel_map__functions->dso->functions);
402 symbol__delete(pos);
403 } else {
404 if (map != kernel_map__functions) {
405 rb_erase(&pos->rb_node,
406 &kernel_map__functions->dso->functions);
407 symbols__insert(&map->dso->functions, pos);
408 }
409 count++;
410 }
411 }
412
413 return count;
414 }
415
416
417 static int kernel_maps__load_kallsyms(symbol_filter_t filter)
418 {
419 if (kernel_maps__load_all_kallsyms())
420 return -1;
421
422 symbols__fixup_end(&kernel_map__functions->dso->functions);
423 kernel_map__functions->dso->origin = DSO__ORIG_KERNEL;
424
425 return kernel_maps__split_kallsyms(filter);
426 }
427
428 size_t kernel_maps__fprintf(FILE *fp)
429 {
430 size_t printed = fprintf(fp, "Kernel maps:\n");
431 struct rb_node *nd;
432
433 for (nd = rb_first(&kernel_maps__functions); nd; nd = rb_next(nd)) {
434 struct map *pos = rb_entry(nd, struct map, rb_node);
435
436 printed += fprintf(fp, "Map:");
437 printed += map__fprintf(pos, fp);
438 if (verbose > 1) {
439 printed += dso__fprintf(pos->dso, fp);
440 printed += fprintf(fp, "--\n");
441 }
442 }
443
444 return printed + fprintf(fp, "END kernel maps\n");
445 }
446
447 static int dso__load_perf_map(struct dso *self, struct map *map,
448 symbol_filter_t filter)
449 {
450 char *line = NULL;
451 size_t n;
452 FILE *file;
453 int nr_syms = 0;
454
455 file = fopen(self->long_name, "r");
456 if (file == NULL)
457 goto out_failure;
458
459 while (!feof(file)) {
460 u64 start, size;
461 struct symbol *sym;
462 int line_len, len;
463
464 line_len = getline(&line, &n, file);
465 if (line_len < 0)
466 break;
467
468 if (!line)
469 goto out_failure;
470
471 line[--line_len] = '\0'; /* \n */
472
473 len = hex2u64(line, &start);
474
475 len++;
476 if (len + 2 >= line_len)
477 continue;
478
479 len += hex2u64(line + len, &size);
480
481 len++;
482 if (len + 2 >= line_len)
483 continue;
484
485 sym = symbol__new(start, size, line + len);
486
487 if (sym == NULL)
488 goto out_delete_line;
489
490 if (filter && filter(map, sym))
491 symbol__delete(sym);
492 else {
493 symbols__insert(&self->functions, sym);
494 nr_syms++;
495 }
496 }
497
498 free(line);
499 fclose(file);
500
501 return nr_syms;
502
503 out_delete_line:
504 free(line);
505 out_failure:
506 return -1;
507 }
508
509 /**
510 * elf_symtab__for_each_symbol - iterate thru all the symbols
511 *
512 * @self: struct elf_symtab instance to iterate
513 * @idx: uint32_t idx
514 * @sym: GElf_Sym iterator
515 */
516 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
517 for (idx = 0, gelf_getsym(syms, idx, &sym);\
518 idx < nr_syms; \
519 idx++, gelf_getsym(syms, idx, &sym))
520
521 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
522 {
523 return GELF_ST_TYPE(sym->st_info);
524 }
525
526 static inline int elf_sym__is_function(const GElf_Sym *sym)
527 {
528 return elf_sym__type(sym) == STT_FUNC &&
529 sym->st_name != 0 &&
530 sym->st_shndx != SHN_UNDEF;
531 }
532
533 static inline int elf_sym__is_label(const GElf_Sym *sym)
534 {
535 return elf_sym__type(sym) == STT_NOTYPE &&
536 sym->st_name != 0 &&
537 sym->st_shndx != SHN_UNDEF &&
538 sym->st_shndx != SHN_ABS;
539 }
540
541 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
542 const Elf_Data *secstrs)
543 {
544 return secstrs->d_buf + shdr->sh_name;
545 }
546
547 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
548 const Elf_Data *secstrs)
549 {
550 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
551 }
552
553 static inline const char *elf_sym__name(const GElf_Sym *sym,
554 const Elf_Data *symstrs)
555 {
556 return symstrs->d_buf + sym->st_name;
557 }
558
559 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
560 GElf_Shdr *shp, const char *name,
561 size_t *idx)
562 {
563 Elf_Scn *sec = NULL;
564 size_t cnt = 1;
565
566 while ((sec = elf_nextscn(elf, sec)) != NULL) {
567 char *str;
568
569 gelf_getshdr(sec, shp);
570 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
571 if (!strcmp(name, str)) {
572 if (idx)
573 *idx = cnt;
574 break;
575 }
576 ++cnt;
577 }
578
579 return sec;
580 }
581
582 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
583 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
584 idx < nr_entries; \
585 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
586
587 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
588 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
589 idx < nr_entries; \
590 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
591
592 /*
593 * We need to check if we have a .dynsym, so that we can handle the
594 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
595 * .dynsym or .symtab).
596 * And always look at the original dso, not at debuginfo packages, that
597 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
598 */
599 static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
600 symbol_filter_t filter)
601 {
602 uint32_t nr_rel_entries, idx;
603 GElf_Sym sym;
604 u64 plt_offset;
605 GElf_Shdr shdr_plt;
606 struct symbol *f;
607 GElf_Shdr shdr_rel_plt, shdr_dynsym;
608 Elf_Data *reldata, *syms, *symstrs;
609 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
610 size_t dynsym_idx;
611 GElf_Ehdr ehdr;
612 char sympltname[1024];
613 Elf *elf;
614 int nr = 0, symidx, fd, err = 0;
615
616 fd = open(self->long_name, O_RDONLY);
617 if (fd < 0)
618 goto out;
619
620 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
621 if (elf == NULL)
622 goto out_close;
623
624 if (gelf_getehdr(elf, &ehdr) == NULL)
625 goto out_elf_end;
626
627 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
628 ".dynsym", &dynsym_idx);
629 if (scn_dynsym == NULL)
630 goto out_elf_end;
631
632 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
633 ".rela.plt", NULL);
634 if (scn_plt_rel == NULL) {
635 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
636 ".rel.plt", NULL);
637 if (scn_plt_rel == NULL)
638 goto out_elf_end;
639 }
640
641 err = -1;
642
643 if (shdr_rel_plt.sh_link != dynsym_idx)
644 goto out_elf_end;
645
646 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
647 goto out_elf_end;
648
649 /*
650 * Fetch the relocation section to find the idxes to the GOT
651 * and the symbols in the .dynsym they refer to.
652 */
653 reldata = elf_getdata(scn_plt_rel, NULL);
654 if (reldata == NULL)
655 goto out_elf_end;
656
657 syms = elf_getdata(scn_dynsym, NULL);
658 if (syms == NULL)
659 goto out_elf_end;
660
661 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
662 if (scn_symstrs == NULL)
663 goto out_elf_end;
664
665 symstrs = elf_getdata(scn_symstrs, NULL);
666 if (symstrs == NULL)
667 goto out_elf_end;
668
669 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
670 plt_offset = shdr_plt.sh_offset;
671
672 if (shdr_rel_plt.sh_type == SHT_RELA) {
673 GElf_Rela pos_mem, *pos;
674
675 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
676 nr_rel_entries) {
677 symidx = GELF_R_SYM(pos->r_info);
678 plt_offset += shdr_plt.sh_entsize;
679 gelf_getsym(syms, symidx, &sym);
680 snprintf(sympltname, sizeof(sympltname),
681 "%s@plt", elf_sym__name(&sym, symstrs));
682
683 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
684 sympltname);
685 if (!f)
686 goto out_elf_end;
687
688 if (filter && filter(map, f))
689 symbol__delete(f);
690 else {
691 symbols__insert(&self->functions, f);
692 ++nr;
693 }
694 }
695 } else if (shdr_rel_plt.sh_type == SHT_REL) {
696 GElf_Rel pos_mem, *pos;
697 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
698 nr_rel_entries) {
699 symidx = GELF_R_SYM(pos->r_info);
700 plt_offset += shdr_plt.sh_entsize;
701 gelf_getsym(syms, symidx, &sym);
702 snprintf(sympltname, sizeof(sympltname),
703 "%s@plt", elf_sym__name(&sym, symstrs));
704
705 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
706 sympltname);
707 if (!f)
708 goto out_elf_end;
709
710 if (filter && filter(map, f))
711 symbol__delete(f);
712 else {
713 symbols__insert(&self->functions, f);
714 ++nr;
715 }
716 }
717 }
718
719 err = 0;
720 out_elf_end:
721 elf_end(elf);
722 out_close:
723 close(fd);
724
725 if (err == 0)
726 return nr;
727 out:
728 pr_warning("%s: problems reading %s PLT info.\n",
729 __func__, self->long_name);
730 return 0;
731 }
732
733 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
734 int fd, symbol_filter_t filter, int kernel,
735 int kmodule)
736 {
737 struct map *curr_map = map;
738 struct dso *curr_dso = self;
739 size_t dso_name_len = strlen(self->short_name);
740 Elf_Data *symstrs, *secstrs;
741 uint32_t nr_syms;
742 int err = -1;
743 uint32_t idx;
744 GElf_Ehdr ehdr;
745 GElf_Shdr shdr;
746 Elf_Data *syms;
747 GElf_Sym sym;
748 Elf_Scn *sec, *sec_strndx;
749 Elf *elf;
750 int nr = 0;
751
752 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
753 if (elf == NULL) {
754 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
755 goto out_close;
756 }
757
758 if (gelf_getehdr(elf, &ehdr) == NULL) {
759 pr_err("%s: cannot get elf header.\n", __func__);
760 goto out_elf_end;
761 }
762
763 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
764 if (sec == NULL) {
765 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
766 if (sec == NULL)
767 goto out_elf_end;
768 }
769
770 syms = elf_getdata(sec, NULL);
771 if (syms == NULL)
772 goto out_elf_end;
773
774 sec = elf_getscn(elf, shdr.sh_link);
775 if (sec == NULL)
776 goto out_elf_end;
777
778 symstrs = elf_getdata(sec, NULL);
779 if (symstrs == NULL)
780 goto out_elf_end;
781
782 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
783 if (sec_strndx == NULL)
784 goto out_elf_end;
785
786 secstrs = elf_getdata(sec_strndx, NULL);
787 if (secstrs == NULL)
788 goto out_elf_end;
789
790 nr_syms = shdr.sh_size / shdr.sh_entsize;
791
792 memset(&sym, 0, sizeof(sym));
793 if (!kernel) {
794 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
795 elf_section_by_name(elf, &ehdr, &shdr,
796 ".gnu.prelink_undo",
797 NULL) != NULL);
798 } else self->adjust_symbols = 0;
799
800 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
801 struct symbol *f;
802 const char *elf_name;
803 char *demangled = NULL;
804 int is_label = elf_sym__is_label(&sym);
805 const char *section_name;
806
807 if (!is_label && !elf_sym__is_function(&sym))
808 continue;
809
810 sec = elf_getscn(elf, sym.st_shndx);
811 if (!sec)
812 goto out_elf_end;
813
814 gelf_getshdr(sec, &shdr);
815
816 if (is_label && !elf_sec__is_text(&shdr, secstrs))
817 continue;
818
819 elf_name = elf_sym__name(&sym, symstrs);
820 section_name = elf_sec__name(&shdr, secstrs);
821
822 if (kernel || kmodule) {
823 char dso_name[PATH_MAX];
824
825 if (strcmp(section_name,
826 curr_dso->short_name + dso_name_len) == 0)
827 goto new_symbol;
828
829 if (strcmp(section_name, ".text") == 0) {
830 curr_map = map;
831 curr_dso = self;
832 goto new_symbol;
833 }
834
835 snprintf(dso_name, sizeof(dso_name),
836 "%s%s", self->short_name, section_name);
837
838 curr_map = kernel_maps__find_by_dso_name(dso_name);
839 if (curr_map == NULL) {
840 u64 start = sym.st_value;
841
842 if (kmodule)
843 start += map->start + shdr.sh_offset;
844
845 curr_dso = dso__new(dso_name);
846 if (curr_dso == NULL)
847 goto out_elf_end;
848 curr_map = map__new2(start, curr_dso);
849 if (curr_map == NULL) {
850 dso__delete(curr_dso);
851 goto out_elf_end;
852 }
853 curr_map->map_ip = identity__map_ip;
854 curr_map->unmap_ip = identity__map_ip;
855 curr_dso->origin = DSO__ORIG_KERNEL;
856 kernel_maps__insert(curr_map);
857 dsos__add(&dsos__kernel, curr_dso);
858 } else
859 curr_dso = curr_map->dso;
860
861 goto new_symbol;
862 }
863
864 if (curr_dso->adjust_symbols) {
865 pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
866 "%Lx sh_offset: %Lx\n", (u64)sym.st_value,
867 (u64)shdr.sh_addr, (u64)shdr.sh_offset);
868 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
869 }
870 /*
871 * We need to figure out if the object was created from C++ sources
872 * DWARF DW_compile_unit has this, but we don't always have access
873 * to it...
874 */
875 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
876 if (demangled != NULL)
877 elf_name = demangled;
878 new_symbol:
879 f = symbol__new(sym.st_value, sym.st_size, elf_name);
880 free(demangled);
881 if (!f)
882 goto out_elf_end;
883
884 if (filter && filter(curr_map, f))
885 symbol__delete(f);
886 else {
887 symbols__insert(&curr_dso->functions, f);
888 nr++;
889 }
890 }
891
892 /*
893 * For misannotated, zeroed, ASM function sizes.
894 */
895 if (nr > 0)
896 symbols__fixup_end(&self->functions);
897 err = nr;
898 out_elf_end:
899 elf_end(elf);
900 out_close:
901 return err;
902 }
903
904 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
905 {
906 return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
907 }
908
909 static bool __dsos__read_build_ids(struct list_head *head)
910 {
911 bool have_build_id = false;
912 struct dso *pos;
913
914 list_for_each_entry(pos, head, node)
915 if (filename__read_build_id(pos->long_name, pos->build_id,
916 sizeof(pos->build_id)) > 0) {
917 have_build_id = true;
918 pos->has_build_id = true;
919 }
920
921 return have_build_id;
922 }
923
924 bool dsos__read_build_ids(void)
925 {
926 return __dsos__read_build_ids(&dsos__kernel) ||
927 __dsos__read_build_ids(&dsos__user);
928 }
929
930 /*
931 * Align offset to 4 bytes as needed for note name and descriptor data.
932 */
933 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
934
935 int filename__read_build_id(const char *filename, void *bf, size_t size)
936 {
937 int fd, err = -1;
938 GElf_Ehdr ehdr;
939 GElf_Shdr shdr;
940 Elf_Data *data;
941 Elf_Scn *sec;
942 Elf_Kind ek;
943 void *ptr;
944 Elf *elf;
945
946 if (size < BUILD_ID_SIZE)
947 goto out;
948
949 fd = open(filename, O_RDONLY);
950 if (fd < 0)
951 goto out;
952
953 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
954 if (elf == NULL) {
955 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
956 goto out_close;
957 }
958
959 ek = elf_kind(elf);
960 if (ek != ELF_K_ELF)
961 goto out_elf_end;
962
963 if (gelf_getehdr(elf, &ehdr) == NULL) {
964 pr_err("%s: cannot get elf header.\n", __func__);
965 goto out_elf_end;
966 }
967
968 sec = elf_section_by_name(elf, &ehdr, &shdr,
969 ".note.gnu.build-id", NULL);
970 if (sec == NULL) {
971 sec = elf_section_by_name(elf, &ehdr, &shdr,
972 ".notes", NULL);
973 if (sec == NULL)
974 goto out_elf_end;
975 }
976
977 data = elf_getdata(sec, NULL);
978 if (data == NULL)
979 goto out_elf_end;
980
981 ptr = data->d_buf;
982 while (ptr < (data->d_buf + data->d_size)) {
983 GElf_Nhdr *nhdr = ptr;
984 int namesz = NOTE_ALIGN(nhdr->n_namesz),
985 descsz = NOTE_ALIGN(nhdr->n_descsz);
986 const char *name;
987
988 ptr += sizeof(*nhdr);
989 name = ptr;
990 ptr += namesz;
991 if (nhdr->n_type == NT_GNU_BUILD_ID &&
992 nhdr->n_namesz == sizeof("GNU")) {
993 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
994 memcpy(bf, ptr, BUILD_ID_SIZE);
995 err = BUILD_ID_SIZE;
996 break;
997 }
998 }
999 ptr += descsz;
1000 }
1001 out_elf_end:
1002 elf_end(elf);
1003 out_close:
1004 close(fd);
1005 out:
1006 return err;
1007 }
1008
1009 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1010 {
1011 int fd, err = -1;
1012
1013 if (size < BUILD_ID_SIZE)
1014 goto out;
1015
1016 fd = open(filename, O_RDONLY);
1017 if (fd < 0)
1018 goto out;
1019
1020 while (1) {
1021 char bf[BUFSIZ];
1022 GElf_Nhdr nhdr;
1023 int namesz, descsz;
1024
1025 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1026 break;
1027
1028 namesz = NOTE_ALIGN(nhdr.n_namesz);
1029 descsz = NOTE_ALIGN(nhdr.n_descsz);
1030 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1031 nhdr.n_namesz == sizeof("GNU")) {
1032 if (read(fd, bf, namesz) != namesz)
1033 break;
1034 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1035 if (read(fd, build_id,
1036 BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1037 err = 0;
1038 break;
1039 }
1040 } else if (read(fd, bf, descsz) != descsz)
1041 break;
1042 } else {
1043 int n = namesz + descsz;
1044 if (read(fd, bf, n) != n)
1045 break;
1046 }
1047 }
1048 close(fd);
1049 out:
1050 return err;
1051 }
1052
1053 char dso__symtab_origin(const struct dso *self)
1054 {
1055 static const char origin[] = {
1056 [DSO__ORIG_KERNEL] = 'k',
1057 [DSO__ORIG_JAVA_JIT] = 'j',
1058 [DSO__ORIG_FEDORA] = 'f',
1059 [DSO__ORIG_UBUNTU] = 'u',
1060 [DSO__ORIG_BUILDID] = 'b',
1061 [DSO__ORIG_DSO] = 'd',
1062 [DSO__ORIG_KMODULE] = 'K',
1063 };
1064
1065 if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1066 return '!';
1067 return origin[self->origin];
1068 }
1069
1070 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1071 {
1072 int size = PATH_MAX;
1073 char *name;
1074 u8 build_id[BUILD_ID_SIZE];
1075 int ret = -1;
1076 int fd;
1077
1078 self->loaded = 1;
1079
1080 if (self->kernel)
1081 return dso__load_kernel_sym(self, map, filter);
1082
1083 name = malloc(size);
1084 if (!name)
1085 return -1;
1086
1087 self->adjust_symbols = 0;
1088
1089 if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1090 ret = dso__load_perf_map(self, map, filter);
1091 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1092 DSO__ORIG_NOT_FOUND;
1093 return ret;
1094 }
1095
1096 self->origin = DSO__ORIG_FEDORA - 1;
1097
1098 more:
1099 do {
1100 self->origin++;
1101 switch (self->origin) {
1102 case DSO__ORIG_FEDORA:
1103 snprintf(name, size, "/usr/lib/debug%s.debug",
1104 self->long_name);
1105 break;
1106 case DSO__ORIG_UBUNTU:
1107 snprintf(name, size, "/usr/lib/debug%s",
1108 self->long_name);
1109 break;
1110 case DSO__ORIG_BUILDID:
1111 if (filename__read_build_id(self->long_name, build_id,
1112 sizeof(build_id))) {
1113 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1114
1115 build_id__sprintf(build_id, sizeof(build_id),
1116 build_id_hex);
1117 snprintf(name, size,
1118 "/usr/lib/debug/.build-id/%.2s/%s.debug",
1119 build_id_hex, build_id_hex + 2);
1120 if (self->has_build_id)
1121 goto compare_build_id;
1122 break;
1123 }
1124 self->origin++;
1125 /* Fall thru */
1126 case DSO__ORIG_DSO:
1127 snprintf(name, size, "%s", self->long_name);
1128 break;
1129
1130 default:
1131 goto out;
1132 }
1133
1134 if (self->has_build_id) {
1135 if (filename__read_build_id(name, build_id,
1136 sizeof(build_id)) < 0)
1137 goto more;
1138 compare_build_id:
1139 if (!dso__build_id_equal(self, build_id))
1140 goto more;
1141 }
1142
1143 fd = open(name, O_RDONLY);
1144 } while (fd < 0);
1145
1146 ret = dso__load_sym(self, map, name, fd, filter, 0, 0);
1147 close(fd);
1148
1149 /*
1150 * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1151 */
1152 if (!ret)
1153 goto more;
1154
1155 if (ret > 0) {
1156 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1157 if (nr_plt > 0)
1158 ret += nr_plt;
1159 }
1160 out:
1161 free(name);
1162 if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1163 return 0;
1164 return ret;
1165 }
1166
1167 struct map *kernel_map__functions;
1168
1169 static void kernel_maps__insert(struct map *map)
1170 {
1171 maps__insert(&kernel_maps__functions, map);
1172 }
1173
1174 struct symbol *kernel_maps__find_function(u64 ip, struct map **mapp,
1175 symbol_filter_t filter)
1176 {
1177 struct map *map = maps__find(&kernel_maps__functions, ip);
1178
1179 if (mapp)
1180 *mapp = map;
1181
1182 if (map) {
1183 ip = map->map_ip(map, ip);
1184 return map__find_function(map, ip, filter);
1185 } else
1186 WARN_ONCE(RB_EMPTY_ROOT(&kernel_maps__functions),
1187 "Empty kernel_maps, was symbol__init() called?\n");
1188
1189 return NULL;
1190 }
1191
1192 struct map *kernel_maps__find_by_dso_name(const char *name)
1193 {
1194 struct rb_node *nd;
1195
1196 for (nd = rb_first(&kernel_maps__functions); nd; nd = rb_next(nd)) {
1197 struct map *map = rb_entry(nd, struct map, rb_node);
1198
1199 if (map->dso && strcmp(map->dso->name, name) == 0)
1200 return map;
1201 }
1202
1203 return NULL;
1204 }
1205
1206 static int dsos__set_modules_path_dir(char *dirname)
1207 {
1208 struct dirent *dent;
1209 DIR *dir = opendir(dirname);
1210
1211 if (!dir) {
1212 pr_debug("%s: cannot open %s dir\n", __func__, dirname);
1213 return -1;
1214 }
1215
1216 while ((dent = readdir(dir)) != NULL) {
1217 char path[PATH_MAX];
1218
1219 if (dent->d_type == DT_DIR) {
1220 if (!strcmp(dent->d_name, ".") ||
1221 !strcmp(dent->d_name, ".."))
1222 continue;
1223
1224 snprintf(path, sizeof(path), "%s/%s",
1225 dirname, dent->d_name);
1226 if (dsos__set_modules_path_dir(path) < 0)
1227 goto failure;
1228 } else {
1229 char *dot = strrchr(dent->d_name, '.'),
1230 dso_name[PATH_MAX];
1231 struct map *map;
1232 char *long_name;
1233
1234 if (dot == NULL || strcmp(dot, ".ko"))
1235 continue;
1236 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1237 (int)(dot - dent->d_name), dent->d_name);
1238
1239 strxfrchar(dso_name, '-', '_');
1240 map = kernel_maps__find_by_dso_name(dso_name);
1241 if (map == NULL)
1242 continue;
1243
1244 snprintf(path, sizeof(path), "%s/%s",
1245 dirname, dent->d_name);
1246
1247 long_name = strdup(path);
1248 if (long_name == NULL)
1249 goto failure;
1250 dso__set_long_name(map->dso, long_name);
1251 }
1252 }
1253
1254 return 0;
1255 failure:
1256 closedir(dir);
1257 return -1;
1258 }
1259
1260 static int dsos__set_modules_path(void)
1261 {
1262 struct utsname uts;
1263 char modules_path[PATH_MAX];
1264
1265 if (uname(&uts) < 0)
1266 return -1;
1267
1268 snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1269 uts.release);
1270
1271 return dsos__set_modules_path_dir(modules_path);
1272 }
1273
1274 /*
1275 * Constructor variant for modules (where we know from /proc/modules where
1276 * they are loaded) and for vmlinux, where only after we load all the
1277 * symbols we'll know where it starts and ends.
1278 */
1279 static struct map *map__new2(u64 start, struct dso *dso)
1280 {
1281 struct map *self = malloc(sizeof(*self));
1282
1283 if (self != NULL) {
1284 /*
1285 * ->end will be filled after we load all the symbols
1286 */
1287 map__init(self, start, 0, 0, dso);
1288 }
1289
1290 return self;
1291 }
1292
1293 static int kernel_maps__create_module_maps(void)
1294 {
1295 char *line = NULL;
1296 size_t n;
1297 FILE *file = fopen("/proc/modules", "r");
1298 struct map *map;
1299
1300 if (file == NULL)
1301 return -1;
1302
1303 while (!feof(file)) {
1304 char name[PATH_MAX];
1305 u64 start;
1306 struct dso *dso;
1307 char *sep;
1308 int line_len;
1309
1310 line_len = getline(&line, &n, file);
1311 if (line_len < 0)
1312 break;
1313
1314 if (!line)
1315 goto out_failure;
1316
1317 line[--line_len] = '\0'; /* \n */
1318
1319 sep = strrchr(line, 'x');
1320 if (sep == NULL)
1321 continue;
1322
1323 hex2u64(sep + 1, &start);
1324
1325 sep = strchr(line, ' ');
1326 if (sep == NULL)
1327 continue;
1328
1329 *sep = '\0';
1330
1331 snprintf(name, sizeof(name), "[%s]", line);
1332 dso = dso__new(name);
1333
1334 if (dso == NULL)
1335 goto out_delete_line;
1336
1337 map = map__new2(start, dso);
1338 if (map == NULL) {
1339 dso__delete(dso);
1340 goto out_delete_line;
1341 }
1342
1343 snprintf(name, sizeof(name),
1344 "/sys/module/%s/notes/.note.gnu.build-id", line);
1345 if (sysfs__read_build_id(name, dso->build_id,
1346 sizeof(dso->build_id)) == 0)
1347 dso->has_build_id = true;
1348
1349 dso->origin = DSO__ORIG_KMODULE;
1350 kernel_maps__insert(map);
1351 dsos__add(&dsos__kernel, dso);
1352 }
1353
1354 free(line);
1355 fclose(file);
1356
1357 return dsos__set_modules_path();
1358
1359 out_delete_line:
1360 free(line);
1361 out_failure:
1362 return -1;
1363 }
1364
1365 static int dso__load_vmlinux(struct dso *self, struct map *map,
1366 const char *vmlinux, symbol_filter_t filter)
1367 {
1368 int err = -1, fd;
1369
1370 if (self->has_build_id) {
1371 u8 build_id[BUILD_ID_SIZE];
1372
1373 if (filename__read_build_id(vmlinux, build_id,
1374 sizeof(build_id)) < 0) {
1375 pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1376 return -1;
1377 }
1378 if (!dso__build_id_equal(self, build_id)) {
1379 char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1380 vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1381
1382 build_id__sprintf(self->build_id,
1383 sizeof(self->build_id),
1384 expected_build_id);
1385 build_id__sprintf(build_id, sizeof(build_id),
1386 vmlinux_build_id);
1387 pr_debug("build_id in %s is %s while expected is %s, "
1388 "ignoring it\n", vmlinux, vmlinux_build_id,
1389 expected_build_id);
1390 return -1;
1391 }
1392 }
1393
1394 fd = open(vmlinux, O_RDONLY);
1395 if (fd < 0)
1396 return -1;
1397
1398 self->loaded = 1;
1399 err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0);
1400
1401 close(fd);
1402
1403 return err;
1404 }
1405
1406 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1407 symbol_filter_t filter)
1408 {
1409 int err;
1410 bool is_kallsyms;
1411
1412 if (vmlinux_path != NULL) {
1413 int i;
1414 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1415 vmlinux_path__nr_entries);
1416 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1417 err = dso__load_vmlinux(self, map, vmlinux_path[i],
1418 filter);
1419 if (err > 0) {
1420 pr_debug("Using %s for symbols\n",
1421 vmlinux_path[i]);
1422 dso__set_long_name(self,
1423 strdup(vmlinux_path[i]));
1424 goto out_fixup;
1425 }
1426 }
1427 }
1428
1429 is_kallsyms = self->long_name[0] == '[';
1430 if (is_kallsyms)
1431 goto do_kallsyms;
1432
1433 err = dso__load_vmlinux(self, map, self->long_name, filter);
1434 if (err <= 0) {
1435 pr_info("The file %s cannot be used, "
1436 "trying to use /proc/kallsyms...", self->long_name);
1437 sleep(2);
1438 do_kallsyms:
1439 err = kernel_maps__load_kallsyms(filter);
1440 if (err > 0 && !is_kallsyms)
1441 dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1442 }
1443
1444 if (err > 0) {
1445 out_fixup:
1446 map__fixup_start(map, &map->dso->functions);
1447 map__fixup_end(map, &map->dso->functions);
1448 }
1449
1450 return err;
1451 }
1452
1453 LIST_HEAD(dsos__user);
1454 LIST_HEAD(dsos__kernel);
1455 struct dso *vdso;
1456
1457 static void dsos__add(struct list_head *head, struct dso *dso)
1458 {
1459 list_add_tail(&dso->node, head);
1460 }
1461
1462 static struct dso *dsos__find(struct list_head *head, const char *name)
1463 {
1464 struct dso *pos;
1465
1466 list_for_each_entry(pos, head, node)
1467 if (strcmp(pos->name, name) == 0)
1468 return pos;
1469 return NULL;
1470 }
1471
1472 struct dso *dsos__findnew(const char *name)
1473 {
1474 struct dso *dso = dsos__find(&dsos__user, name);
1475
1476 if (!dso) {
1477 dso = dso__new(name);
1478 if (dso != NULL) {
1479 dsos__add(&dsos__user, dso);
1480 dso__set_basename(dso);
1481 }
1482 }
1483
1484 return dso;
1485 }
1486
1487 static void __dsos__fprintf(struct list_head *head, FILE *fp)
1488 {
1489 struct dso *pos;
1490
1491 list_for_each_entry(pos, head, node)
1492 dso__fprintf(pos, fp);
1493 }
1494
1495 void dsos__fprintf(FILE *fp)
1496 {
1497 __dsos__fprintf(&dsos__kernel, fp);
1498 __dsos__fprintf(&dsos__user, fp);
1499 }
1500
1501 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp)
1502 {
1503 struct dso *pos;
1504 size_t ret = 0;
1505
1506 list_for_each_entry(pos, head, node) {
1507 ret += dso__fprintf_buildid(pos, fp);
1508 ret += fprintf(fp, " %s\n", pos->long_name);
1509 }
1510 return ret;
1511 }
1512
1513 size_t dsos__fprintf_buildid(FILE *fp)
1514 {
1515 return (__dsos__fprintf_buildid(&dsos__kernel, fp) +
1516 __dsos__fprintf_buildid(&dsos__user, fp));
1517 }
1518
1519 static int kernel_maps__create_kernel_map(const struct symbol_conf *conf)
1520 {
1521 struct dso *kernel = dso__new(conf->vmlinux_name ?: "[kernel.kallsyms]");
1522
1523 if (kernel == NULL)
1524 return -1;
1525
1526 kernel_map__functions = map__new2(0, kernel);
1527 if (kernel_map__functions == NULL)
1528 goto out_delete_kernel_dso;
1529
1530 kernel_map__functions->map_ip = kernel_map__functions->unmap_ip = identity__map_ip;
1531 kernel->short_name = "[kernel]";
1532 kernel->kernel = 1;
1533
1534 vdso = dso__new("[vdso]");
1535 if (vdso == NULL)
1536 goto out_delete_kernel_map;
1537 vdso->loaded = 1;
1538
1539 if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
1540 sizeof(kernel->build_id)) == 0)
1541 kernel->has_build_id = true;
1542
1543 kernel_maps__insert(kernel_map__functions);
1544 dsos__add(&dsos__kernel, kernel);
1545 dsos__add(&dsos__user, vdso);
1546
1547 return 0;
1548
1549 out_delete_kernel_map:
1550 map__delete(kernel_map__functions);
1551 kernel_map__functions = NULL;
1552 out_delete_kernel_dso:
1553 dso__delete(kernel);
1554 return -1;
1555 }
1556
1557 static void vmlinux_path__exit(void)
1558 {
1559 while (--vmlinux_path__nr_entries >= 0) {
1560 free(vmlinux_path[vmlinux_path__nr_entries]);
1561 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1562 }
1563
1564 free(vmlinux_path);
1565 vmlinux_path = NULL;
1566 }
1567
1568 static int vmlinux_path__init(void)
1569 {
1570 struct utsname uts;
1571 char bf[PATH_MAX];
1572
1573 if (uname(&uts) < 0)
1574 return -1;
1575
1576 vmlinux_path = malloc(sizeof(char *) * 5);
1577 if (vmlinux_path == NULL)
1578 return -1;
1579
1580 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1581 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1582 goto out_fail;
1583 ++vmlinux_path__nr_entries;
1584 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1585 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1586 goto out_fail;
1587 ++vmlinux_path__nr_entries;
1588 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1589 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1590 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1591 goto out_fail;
1592 ++vmlinux_path__nr_entries;
1593 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1594 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1595 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1596 goto out_fail;
1597 ++vmlinux_path__nr_entries;
1598 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1599 uts.release);
1600 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1601 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1602 goto out_fail;
1603 ++vmlinux_path__nr_entries;
1604
1605 return 0;
1606
1607 out_fail:
1608 vmlinux_path__exit();
1609 return -1;
1610 }
1611
1612 static int kernel_maps__init(const struct symbol_conf *conf)
1613 {
1614 const struct symbol_conf *pconf = conf ?: &symbol_conf__defaults;
1615
1616 symbol__priv_size = pconf->priv_size;
1617
1618 if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
1619 return -1;
1620
1621 if (kernel_maps__create_kernel_map(pconf) < 0) {
1622 vmlinux_path__exit();
1623 return -1;
1624 }
1625
1626 if (pconf->use_modules && kernel_maps__create_module_maps() < 0)
1627 pr_debug("Failed to load list of modules in use, "
1628 "continuing...\n");
1629 /*
1630 * Now that we have all the maps created, just set the ->end of them:
1631 */
1632 kernel_maps__fixup_end();
1633 return 0;
1634 }
1635
1636 int symbol__init(struct symbol_conf *conf)
1637 {
1638 elf_version(EV_CURRENT);
1639 return kernel_maps__init(conf);
1640 }
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