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vmxnet3: Fix inconsistent LRO state after initialization
[linux-2.6/linux-mips.git] / tools / perf / util / symbol.c
blobf06c10f092ba53036a379a3c05983e3e928808aa
1 #define _GNU_SOURCE
2 #include <ctype.h>
3 #include <dirent.h>
4 #include <errno.h>
5 #include <libgen.h>
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 #include <sys/types.h>
10 #include <sys/stat.h>
11 #include <sys/param.h>
12 #include <fcntl.h>
13 #include <unistd.h>
14 #include <inttypes.h>
15 #include "build-id.h"
16 #include "debug.h"
17 #include "symbol.h"
18 #include "strlist.h"
19
20 #include <libelf.h>
21 #include <gelf.h>
22 #include <elf.h>
23 #include <limits.h>
24 #include <sys/utsname.h>
25
26 #ifndef KSYM_NAME_LEN
27 #define KSYM_NAME_LEN 128
28 #endif
29
30 #ifndef NT_GNU_BUILD_ID
31 #define NT_GNU_BUILD_ID 3
32 #endif
33
34 static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
35 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
36 static void dsos__add(struct list_head *head, struct dso *dso);
37 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
38 static int dso__load_kernel_sym(struct dso *self, struct map *map,
39 symbol_filter_t filter);
40 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
41 symbol_filter_t filter);
42 static int vmlinux_path__nr_entries;
43 static char **vmlinux_path;
44
45 struct symbol_conf symbol_conf = {
46 .exclude_other = true,
47 .use_modules = true,
48 .try_vmlinux_path = true,
49 .symfs = "",
50 };
51
52 int dso__name_len(const struct dso *self)
53 {
54 if (verbose)
55 return self->long_name_len;
56
57 return self->short_name_len;
58 }
59
60 bool dso__loaded(const struct dso *self, enum map_type type)
61 {
62 return self->loaded & (1 << type);
63 }
64
65 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
66 {
67 return self->sorted_by_name & (1 << type);
68 }
69
70 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
71 {
72 self->sorted_by_name |= (1 << type);
73 }
74
75 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
76 {
77 switch (map_type) {
78 case MAP__FUNCTION:
79 return symbol_type == 'T' || symbol_type == 'W';
80 case MAP__VARIABLE:
81 return symbol_type == 'D' || symbol_type == 'd';
82 default:
83 return false;
84 }
85 }
86
87 static void symbols__fixup_end(struct rb_root *self)
88 {
89 struct rb_node *nd, *prevnd = rb_first(self);
90 struct symbol *curr, *prev;
91
92 if (prevnd == NULL)
93 return;
94
95 curr = rb_entry(prevnd, struct symbol, rb_node);
96
97 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
98 prev = curr;
99 curr = rb_entry(nd, struct symbol, rb_node);
100
101 if (prev->end == prev->start && prev->end != curr->start)
102 prev->end = curr->start - 1;
103 }
104
105 /* Last entry */
106 if (curr->end == curr->start)
107 curr->end = roundup(curr->start, 4096);
108 }
109
110 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
111 {
112 struct map *prev, *curr;
113 struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
114
115 if (prevnd == NULL)
116 return;
117
118 curr = rb_entry(prevnd, struct map, rb_node);
119
120 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
121 prev = curr;
122 curr = rb_entry(nd, struct map, rb_node);
123 prev->end = curr->start - 1;
124 }
125
126 /*
127 * We still haven't the actual symbols, so guess the
128 * last map final address.
129 */
130 curr->end = ~0ULL;
131 }
132
133 static void map_groups__fixup_end(struct map_groups *self)
134 {
135 int i;
136 for (i = 0; i < MAP__NR_TYPES; ++i)
137 __map_groups__fixup_end(self, i);
138 }
139
140 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
141 const char *name)
142 {
143 size_t namelen = strlen(name) + 1;
144 struct symbol *self = calloc(1, (symbol_conf.priv_size +
145 sizeof(*self) + namelen));
146 if (self == NULL)
147 return NULL;
148
149 if (symbol_conf.priv_size)
150 self = ((void *)self) + symbol_conf.priv_size;
151
152 self->start = start;
153 self->end = len ? start + len - 1 : start;
154 self->binding = binding;
155 self->namelen = namelen - 1;
156
157 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", __func__, name, start, self->end);
158
159 memcpy(self->name, name, namelen);
160
161 return self;
162 }
163
164 void symbol__delete(struct symbol *self)
165 {
166 free(((void *)self) - symbol_conf.priv_size);
167 }
168
169 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
170 {
171 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
172 self->start, self->end,
173 self->binding == STB_GLOBAL ? 'g' :
174 self->binding == STB_LOCAL ? 'l' : 'w',
175 self->name);
176 }
177
178 void dso__set_long_name(struct dso *self, char *name)
179 {
180 if (name == NULL)
181 return;
182 self->long_name = name;
183 self->long_name_len = strlen(name);
184 }
185
186 static void dso__set_short_name(struct dso *self, const char *name)
187 {
188 if (name == NULL)
189 return;
190 self->short_name = name;
191 self->short_name_len = strlen(name);
192 }
193
194 static void dso__set_basename(struct dso *self)
195 {
196 dso__set_short_name(self, basename(self->long_name));
197 }
198
199 struct dso *dso__new(const char *name)
200 {
201 struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
202
203 if (self != NULL) {
204 int i;
205 strcpy(self->name, name);
206 dso__set_long_name(self, self->name);
207 dso__set_short_name(self, self->name);
208 for (i = 0; i < MAP__NR_TYPES; ++i)
209 self->symbols[i] = self->symbol_names[i] = RB_ROOT;
210 self->symtab_type = SYMTAB__NOT_FOUND;
211 self->loaded = 0;
212 self->sorted_by_name = 0;
213 self->has_build_id = 0;
214 self->kernel = DSO_TYPE_USER;
215 INIT_LIST_HEAD(&self->node);
216 }
217
218 return self;
219 }
220
221 static void symbols__delete(struct rb_root *self)
222 {
223 struct symbol *pos;
224 struct rb_node *next = rb_first(self);
225
226 while (next) {
227 pos = rb_entry(next, struct symbol, rb_node);
228 next = rb_next(&pos->rb_node);
229 rb_erase(&pos->rb_node, self);
230 symbol__delete(pos);
231 }
232 }
233
234 void dso__delete(struct dso *self)
235 {
236 int i;
237 for (i = 0; i < MAP__NR_TYPES; ++i)
238 symbols__delete(&self->symbols[i]);
239 if (self->sname_alloc)
240 free((char *)self->short_name);
241 if (self->lname_alloc)
242 free(self->long_name);
243 free(self);
244 }
245
246 void dso__set_build_id(struct dso *self, void *build_id)
247 {
248 memcpy(self->build_id, build_id, sizeof(self->build_id));
249 self->has_build_id = 1;
250 }
251
252 static void symbols__insert(struct rb_root *self, struct symbol *sym)
253 {
254 struct rb_node **p = &self->rb_node;
255 struct rb_node *parent = NULL;
256 const u64 ip = sym->start;
257 struct symbol *s;
258
259 while (*p != NULL) {
260 parent = *p;
261 s = rb_entry(parent, struct symbol, rb_node);
262 if (ip < s->start)
263 p = &(*p)->rb_left;
264 else
265 p = &(*p)->rb_right;
266 }
267 rb_link_node(&sym->rb_node, parent, p);
268 rb_insert_color(&sym->rb_node, self);
269 }
270
271 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
272 {
273 struct rb_node *n;
274
275 if (self == NULL)
276 return NULL;
277
278 n = self->rb_node;
279
280 while (n) {
281 struct symbol *s = rb_entry(n, struct symbol, rb_node);
282
283 if (ip < s->start)
284 n = n->rb_left;
285 else if (ip > s->end)
286 n = n->rb_right;
287 else
288 return s;
289 }
290
291 return NULL;
292 }
293
294 struct symbol_name_rb_node {
295 struct rb_node rb_node;
296 struct symbol sym;
297 };
298
299 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
300 {
301 struct rb_node **p = &self->rb_node;
302 struct rb_node *parent = NULL;
303 struct symbol_name_rb_node *symn, *s;
304
305 symn = container_of(sym, struct symbol_name_rb_node, sym);
306
307 while (*p != NULL) {
308 parent = *p;
309 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
310 if (strcmp(sym->name, s->sym.name) < 0)
311 p = &(*p)->rb_left;
312 else
313 p = &(*p)->rb_right;
314 }
315 rb_link_node(&symn->rb_node, parent, p);
316 rb_insert_color(&symn->rb_node, self);
317 }
318
319 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
320 {
321 struct rb_node *nd;
322
323 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
324 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
325 symbols__insert_by_name(self, pos);
326 }
327 }
328
329 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
330 {
331 struct rb_node *n;
332
333 if (self == NULL)
334 return NULL;
335
336 n = self->rb_node;
337
338 while (n) {
339 struct symbol_name_rb_node *s;
340 int cmp;
341
342 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
343 cmp = strcmp(name, s->sym.name);
344
345 if (cmp < 0)
346 n = n->rb_left;
347 else if (cmp > 0)
348 n = n->rb_right;
349 else
350 return &s->sym;
351 }
352
353 return NULL;
354 }
355
356 struct symbol *dso__find_symbol(struct dso *self,
357 enum map_type type, u64 addr)
358 {
359 return symbols__find(&self->symbols[type], addr);
360 }
361
362 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
363 const char *name)
364 {
365 return symbols__find_by_name(&self->symbol_names[type], name);
366 }
367
368 void dso__sort_by_name(struct dso *self, enum map_type type)
369 {
370 dso__set_sorted_by_name(self, type);
371 return symbols__sort_by_name(&self->symbol_names[type],
372 &self->symbols[type]);
373 }
374
375 int build_id__sprintf(const u8 *self, int len, char *bf)
376 {
377 char *bid = bf;
378 const u8 *raw = self;
379 int i;
380
381 for (i = 0; i < len; ++i) {
382 sprintf(bid, "%02x", *raw);
383 ++raw;
384 bid += 2;
385 }
386
387 return raw - self;
388 }
389
390 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
391 {
392 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
393
394 build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
395 return fprintf(fp, "%s", sbuild_id);
396 }
397
398 size_t dso__fprintf_symbols_by_name(struct dso *self, enum map_type type, FILE *fp)
399 {
400 size_t ret = 0;
401 struct rb_node *nd;
402 struct symbol_name_rb_node *pos;
403
404 for (nd = rb_first(&self->symbol_names[type]); nd; nd = rb_next(nd)) {
405 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
406 fprintf(fp, "%s\n", pos->sym.name);
407 }
408
409 return ret;
410 }
411
412 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
413 {
414 struct rb_node *nd;
415 size_t ret = fprintf(fp, "dso: %s (", self->short_name);
416
417 if (self->short_name != self->long_name)
418 ret += fprintf(fp, "%s, ", self->long_name);
419 ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
420 self->loaded ? "" : "NOT ");
421 ret += dso__fprintf_buildid(self, fp);
422 ret += fprintf(fp, ")\n");
423 for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
424 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
425 ret += symbol__fprintf(pos, fp);
426 }
427
428 return ret;
429 }
430
431 int kallsyms__parse(const char *filename, void *arg,
432 int (*process_symbol)(void *arg, const char *name,
433 char type, u64 start, u64 end))
434 {
435 char *line = NULL;
436 size_t n;
437 int err = -1;
438 u64 prev_start = 0;
439 char prev_symbol_type = 0;
440 char *prev_symbol_name;
441 FILE *file = fopen(filename, "r");
442
443 if (file == NULL)
444 goto out_failure;
445
446 prev_symbol_name = malloc(KSYM_NAME_LEN);
447 if (prev_symbol_name == NULL)
448 goto out_close;
449
450 err = 0;
451
452 while (!feof(file)) {
453 u64 start;
454 int line_len, len;
455 char symbol_type;
456 char *symbol_name;
457
458 line_len = getline(&line, &n, file);
459 if (line_len < 0 || !line)
460 break;
461
462 line[--line_len] = '\0'; /* \n */
463
464 len = hex2u64(line, &start);
465
466 len++;
467 if (len + 2 >= line_len)
468 continue;
469
470 symbol_type = toupper(line[len]);
471 len += 2;
472 symbol_name = line + len;
473 len = line_len - len;
474
475 if (len >= KSYM_NAME_LEN) {
476 err = -1;
477 break;
478 }
479
480 if (prev_symbol_type) {
481 u64 end = start;
482 if (end != prev_start)
483 --end;
484 err = process_symbol(arg, prev_symbol_name,
485 prev_symbol_type, prev_start, end);
486 if (err)
487 break;
488 }
489
490 memcpy(prev_symbol_name, symbol_name, len + 1);
491 prev_symbol_type = symbol_type;
492 prev_start = start;
493 }
494
495 free(prev_symbol_name);
496 free(line);
497 out_close:
498 fclose(file);
499 return err;
500
501 out_failure:
502 return -1;
503 }
504
505 struct process_kallsyms_args {
506 struct map *map;
507 struct dso *dso;
508 };
509
510 static u8 kallsyms2elf_type(char type)
511 {
512 if (type == 'W')
513 return STB_WEAK;
514
515 return isupper(type) ? STB_GLOBAL : STB_LOCAL;
516 }
517
518 static int map__process_kallsym_symbol(void *arg, const char *name,
519 char type, u64 start, u64 end)
520 {
521 struct symbol *sym;
522 struct process_kallsyms_args *a = arg;
523 struct rb_root *root = &a->dso->symbols[a->map->type];
524
525 if (!symbol_type__is_a(type, a->map->type))
526 return 0;
527
528 sym = symbol__new(start, end - start + 1,
529 kallsyms2elf_type(type), name);
530 if (sym == NULL)
531 return -ENOMEM;
532 /*
533 * We will pass the symbols to the filter later, in
534 * map__split_kallsyms, when we have split the maps per module
535 */
536 symbols__insert(root, sym);
537
538 return 0;
539 }
540
541 /*
542 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
543 * so that we can in the next step set the symbol ->end address and then
544 * call kernel_maps__split_kallsyms.
545 */
546 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
547 struct map *map)
548 {
549 struct process_kallsyms_args args = { .map = map, .dso = self, };
550 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
551 }
552
553 /*
554 * Split the symbols into maps, making sure there are no overlaps, i.e. the
555 * kernel range is broken in several maps, named [kernel].N, as we don't have
556 * the original ELF section names vmlinux have.
557 */
558 static int dso__split_kallsyms(struct dso *self, struct map *map,
559 symbol_filter_t filter)
560 {
561 struct map_groups *kmaps = map__kmap(map)->kmaps;
562 struct machine *machine = kmaps->machine;
563 struct map *curr_map = map;
564 struct symbol *pos;
565 int count = 0, moved = 0;
566 struct rb_root *root = &self->symbols[map->type];
567 struct rb_node *next = rb_first(root);
568 int kernel_range = 0;
569
570 while (next) {
571 char *module;
572
573 pos = rb_entry(next, struct symbol, rb_node);
574 next = rb_next(&pos->rb_node);
575
576 module = strchr(pos->name, '\t');
577 if (module) {
578 if (!symbol_conf.use_modules)
579 goto discard_symbol;
580
581 *module++ = '\0';
582
583 if (strcmp(curr_map->dso->short_name, module)) {
584 if (curr_map != map &&
585 self->kernel == DSO_TYPE_GUEST_KERNEL &&
586 machine__is_default_guest(machine)) {
587 /*
588 * We assume all symbols of a module are
589 * continuous in * kallsyms, so curr_map
590 * points to a module and all its
591 * symbols are in its kmap. Mark it as
592 * loaded.
593 */
594 dso__set_loaded(curr_map->dso,
595 curr_map->type);
596 }
597
598 curr_map = map_groups__find_by_name(kmaps,
599 map->type, module);
600 if (curr_map == NULL) {
601 pr_debug("%s/proc/{kallsyms,modules} "
602 "inconsistency while looking "
603 "for \"%s\" module!\n",
604 machine->root_dir, module);
605 curr_map = map;
606 goto discard_symbol;
607 }
608
609 if (curr_map->dso->loaded &&
610 !machine__is_default_guest(machine))
611 goto discard_symbol;
612 }
613 /*
614 * So that we look just like we get from .ko files,
615 * i.e. not prelinked, relative to map->start.
616 */
617 pos->start = curr_map->map_ip(curr_map, pos->start);
618 pos->end = curr_map->map_ip(curr_map, pos->end);
619 } else if (curr_map != map) {
620 char dso_name[PATH_MAX];
621 struct dso *dso;
622
623 if (count == 0) {
624 curr_map = map;
625 goto filter_symbol;
626 }
627
628 if (self->kernel == DSO_TYPE_GUEST_KERNEL)
629 snprintf(dso_name, sizeof(dso_name),
630 "[guest.kernel].%d",
631 kernel_range++);
632 else
633 snprintf(dso_name, sizeof(dso_name),
634 "[kernel].%d",
635 kernel_range++);
636
637 dso = dso__new(dso_name);
638 if (dso == NULL)
639 return -1;
640
641 dso->kernel = self->kernel;
642
643 curr_map = map__new2(pos->start, dso, map->type);
644 if (curr_map == NULL) {
645 dso__delete(dso);
646 return -1;
647 }
648
649 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
650 map_groups__insert(kmaps, curr_map);
651 ++kernel_range;
652 }
653 filter_symbol:
654 if (filter && filter(curr_map, pos)) {
655 discard_symbol: rb_erase(&pos->rb_node, root);
656 symbol__delete(pos);
657 } else {
658 if (curr_map != map) {
659 rb_erase(&pos->rb_node, root);
660 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
661 ++moved;
662 } else
663 ++count;
664 }
665 }
666
667 if (curr_map != map &&
668 self->kernel == DSO_TYPE_GUEST_KERNEL &&
669 machine__is_default_guest(kmaps->machine)) {
670 dso__set_loaded(curr_map->dso, curr_map->type);
671 }
672
673 return count + moved;
674 }
675
676 int dso__load_kallsyms(struct dso *self, const char *filename,
677 struct map *map, symbol_filter_t filter)
678 {
679 if (dso__load_all_kallsyms(self, filename, map) < 0)
680 return -1;
681
682 if (self->kernel == DSO_TYPE_GUEST_KERNEL)
683 self->symtab_type = SYMTAB__GUEST_KALLSYMS;
684 else
685 self->symtab_type = SYMTAB__KALLSYMS;
686
687 return dso__split_kallsyms(self, map, filter);
688 }
689
690 static int dso__load_perf_map(struct dso *self, struct map *map,
691 symbol_filter_t filter)
692 {
693 char *line = NULL;
694 size_t n;
695 FILE *file;
696 int nr_syms = 0;
697
698 file = fopen(self->long_name, "r");
699 if (file == NULL)
700 goto out_failure;
701
702 while (!feof(file)) {
703 u64 start, size;
704 struct symbol *sym;
705 int line_len, len;
706
707 line_len = getline(&line, &n, file);
708 if (line_len < 0)
709 break;
710
711 if (!line)
712 goto out_failure;
713
714 line[--line_len] = '\0'; /* \n */
715
716 len = hex2u64(line, &start);
717
718 len++;
719 if (len + 2 >= line_len)
720 continue;
721
722 len += hex2u64(line + len, &size);
723
724 len++;
725 if (len + 2 >= line_len)
726 continue;
727
728 sym = symbol__new(start, size, STB_GLOBAL, line + len);
729
730 if (sym == NULL)
731 goto out_delete_line;
732
733 if (filter && filter(map, sym))
734 symbol__delete(sym);
735 else {
736 symbols__insert(&self->symbols[map->type], sym);
737 nr_syms++;
738 }
739 }
740
741 free(line);
742 fclose(file);
743
744 return nr_syms;
745
746 out_delete_line:
747 free(line);
748 out_failure:
749 return -1;
750 }
751
752 /**
753 * elf_symtab__for_each_symbol - iterate thru all the symbols
754 *
755 * @self: struct elf_symtab instance to iterate
756 * @idx: uint32_t idx
757 * @sym: GElf_Sym iterator
758 */
759 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
760 for (idx = 0, gelf_getsym(syms, idx, &sym);\
761 idx < nr_syms; \
762 idx++, gelf_getsym(syms, idx, &sym))
763
764 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
765 {
766 return GELF_ST_TYPE(sym->st_info);
767 }
768
769 static inline int elf_sym__is_function(const GElf_Sym *sym)
770 {
771 return elf_sym__type(sym) == STT_FUNC &&
772 sym->st_name != 0 &&
773 sym->st_shndx != SHN_UNDEF;
774 }
775
776 static inline bool elf_sym__is_object(const GElf_Sym *sym)
777 {
778 return elf_sym__type(sym) == STT_OBJECT &&
779 sym->st_name != 0 &&
780 sym->st_shndx != SHN_UNDEF;
781 }
782
783 static inline int elf_sym__is_label(const GElf_Sym *sym)
784 {
785 return elf_sym__type(sym) == STT_NOTYPE &&
786 sym->st_name != 0 &&
787 sym->st_shndx != SHN_UNDEF &&
788 sym->st_shndx != SHN_ABS;
789 }
790
791 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
792 const Elf_Data *secstrs)
793 {
794 return secstrs->d_buf + shdr->sh_name;
795 }
796
797 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
798 const Elf_Data *secstrs)
799 {
800 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
801 }
802
803 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
804 const Elf_Data *secstrs)
805 {
806 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
807 }
808
809 static inline const char *elf_sym__name(const GElf_Sym *sym,
810 const Elf_Data *symstrs)
811 {
812 return symstrs->d_buf + sym->st_name;
813 }
814
815 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
816 GElf_Shdr *shp, const char *name,
817 size_t *idx)
818 {
819 Elf_Scn *sec = NULL;
820 size_t cnt = 1;
821
822 while ((sec = elf_nextscn(elf, sec)) != NULL) {
823 char *str;
824
825 gelf_getshdr(sec, shp);
826 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
827 if (!strcmp(name, str)) {
828 if (idx)
829 *idx = cnt;
830 break;
831 }
832 ++cnt;
833 }
834
835 return sec;
836 }
837
838 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
839 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
840 idx < nr_entries; \
841 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
842
843 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
844 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
845 idx < nr_entries; \
846 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
847
848 /*
849 * We need to check if we have a .dynsym, so that we can handle the
850 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
851 * .dynsym or .symtab).
852 * And always look at the original dso, not at debuginfo packages, that
853 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
854 */
855 static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
856 symbol_filter_t filter)
857 {
858 uint32_t nr_rel_entries, idx;
859 GElf_Sym sym;
860 u64 plt_offset;
861 GElf_Shdr shdr_plt;
862 struct symbol *f;
863 GElf_Shdr shdr_rel_plt, shdr_dynsym;
864 Elf_Data *reldata, *syms, *symstrs;
865 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
866 size_t dynsym_idx;
867 GElf_Ehdr ehdr;
868 char sympltname[1024];
869 Elf *elf;
870 int nr = 0, symidx, fd, err = 0;
871 char name[PATH_MAX];
872
873 snprintf(name, sizeof(name), "%s%s",
874 symbol_conf.symfs, self->long_name);
875 fd = open(name, O_RDONLY);
876 if (fd < 0)
877 goto out;
878
879 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
880 if (elf == NULL)
881 goto out_close;
882
883 if (gelf_getehdr(elf, &ehdr) == NULL)
884 goto out_elf_end;
885
886 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
887 ".dynsym", &dynsym_idx);
888 if (scn_dynsym == NULL)
889 goto out_elf_end;
890
891 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
892 ".rela.plt", NULL);
893 if (scn_plt_rel == NULL) {
894 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
895 ".rel.plt", NULL);
896 if (scn_plt_rel == NULL)
897 goto out_elf_end;
898 }
899
900 err = -1;
901
902 if (shdr_rel_plt.sh_link != dynsym_idx)
903 goto out_elf_end;
904
905 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
906 goto out_elf_end;
907
908 /*
909 * Fetch the relocation section to find the idxes to the GOT
910 * and the symbols in the .dynsym they refer to.
911 */
912 reldata = elf_getdata(scn_plt_rel, NULL);
913 if (reldata == NULL)
914 goto out_elf_end;
915
916 syms = elf_getdata(scn_dynsym, NULL);
917 if (syms == NULL)
918 goto out_elf_end;
919
920 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
921 if (scn_symstrs == NULL)
922 goto out_elf_end;
923
924 symstrs = elf_getdata(scn_symstrs, NULL);
925 if (symstrs == NULL)
926 goto out_elf_end;
927
928 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
929 plt_offset = shdr_plt.sh_offset;
930
931 if (shdr_rel_plt.sh_type == SHT_RELA) {
932 GElf_Rela pos_mem, *pos;
933
934 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
935 nr_rel_entries) {
936 symidx = GELF_R_SYM(pos->r_info);
937 plt_offset += shdr_plt.sh_entsize;
938 gelf_getsym(syms, symidx, &sym);
939 snprintf(sympltname, sizeof(sympltname),
940 "%s@plt", elf_sym__name(&sym, symstrs));
941
942 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
943 STB_GLOBAL, sympltname);
944 if (!f)
945 goto out_elf_end;
946
947 if (filter && filter(map, f))
948 symbol__delete(f);
949 else {
950 symbols__insert(&self->symbols[map->type], f);
951 ++nr;
952 }
953 }
954 } else if (shdr_rel_plt.sh_type == SHT_REL) {
955 GElf_Rel pos_mem, *pos;
956 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
957 nr_rel_entries) {
958 symidx = GELF_R_SYM(pos->r_info);
959 plt_offset += shdr_plt.sh_entsize;
960 gelf_getsym(syms, symidx, &sym);
961 snprintf(sympltname, sizeof(sympltname),
962 "%s@plt", elf_sym__name(&sym, symstrs));
963
964 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
965 STB_GLOBAL, sympltname);
966 if (!f)
967 goto out_elf_end;
968
969 if (filter && filter(map, f))
970 symbol__delete(f);
971 else {
972 symbols__insert(&self->symbols[map->type], f);
973 ++nr;
974 }
975 }
976 }
977
978 err = 0;
979 out_elf_end:
980 elf_end(elf);
981 out_close:
982 close(fd);
983
984 if (err == 0)
985 return nr;
986 out:
987 pr_debug("%s: problems reading %s PLT info.\n",
988 __func__, self->long_name);
989 return 0;
990 }
991
992 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
993 {
994 switch (type) {
995 case MAP__FUNCTION:
996 return elf_sym__is_function(self);
997 case MAP__VARIABLE:
998 return elf_sym__is_object(self);
999 default:
1000 return false;
1001 }
1002 }
1003
1004 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
1005 {
1006 switch (type) {
1007 case MAP__FUNCTION:
1008 return elf_sec__is_text(self, secstrs);
1009 case MAP__VARIABLE:
1010 return elf_sec__is_data(self, secstrs);
1011 default:
1012 return false;
1013 }
1014 }
1015
1016 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1017 {
1018 Elf_Scn *sec = NULL;
1019 GElf_Shdr shdr;
1020 size_t cnt = 1;
1021
1022 while ((sec = elf_nextscn(elf, sec)) != NULL) {
1023 gelf_getshdr(sec, &shdr);
1024
1025 if ((addr >= shdr.sh_addr) &&
1026 (addr < (shdr.sh_addr + shdr.sh_size)))
1027 return cnt;
1028
1029 ++cnt;
1030 }
1031
1032 return -1;
1033 }
1034
1035 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
1036 int fd, symbol_filter_t filter, int kmodule,
1037 int want_symtab)
1038 {
1039 struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
1040 struct map *curr_map = map;
1041 struct dso *curr_dso = self;
1042 Elf_Data *symstrs, *secstrs;
1043 uint32_t nr_syms;
1044 int err = -1;
1045 uint32_t idx;
1046 GElf_Ehdr ehdr;
1047 GElf_Shdr shdr, opdshdr;
1048 Elf_Data *syms, *opddata = NULL;
1049 GElf_Sym sym;
1050 Elf_Scn *sec, *sec_strndx, *opdsec;
1051 Elf *elf;
1052 int nr = 0;
1053 size_t opdidx = 0;
1054
1055 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1056 if (elf == NULL) {
1057 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1058 goto out_close;
1059 }
1060
1061 if (gelf_getehdr(elf, &ehdr) == NULL) {
1062 pr_debug("%s: cannot get elf header.\n", __func__);
1063 goto out_elf_end;
1064 }
1065
1066 /* Always reject images with a mismatched build-id: */
1067 if (self->has_build_id) {
1068 u8 build_id[BUILD_ID_SIZE];
1069
1070 if (elf_read_build_id(elf, build_id,
1071 BUILD_ID_SIZE) != BUILD_ID_SIZE)
1072 goto out_elf_end;
1073
1074 if (!dso__build_id_equal(self, build_id))
1075 goto out_elf_end;
1076 }
1077
1078 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1079 if (sec == NULL) {
1080 if (want_symtab)
1081 goto out_elf_end;
1082
1083 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1084 if (sec == NULL)
1085 goto out_elf_end;
1086 }
1087
1088 opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1089 if (opdsec)
1090 opddata = elf_rawdata(opdsec, NULL);
1091
1092 syms = elf_getdata(sec, NULL);
1093 if (syms == NULL)
1094 goto out_elf_end;
1095
1096 sec = elf_getscn(elf, shdr.sh_link);
1097 if (sec == NULL)
1098 goto out_elf_end;
1099
1100 symstrs = elf_getdata(sec, NULL);
1101 if (symstrs == NULL)
1102 goto out_elf_end;
1103
1104 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1105 if (sec_strndx == NULL)
1106 goto out_elf_end;
1107
1108 secstrs = elf_getdata(sec_strndx, NULL);
1109 if (secstrs == NULL)
1110 goto out_elf_end;
1111
1112 nr_syms = shdr.sh_size / shdr.sh_entsize;
1113
1114 memset(&sym, 0, sizeof(sym));
1115 if (self->kernel == DSO_TYPE_USER) {
1116 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1117 elf_section_by_name(elf, &ehdr, &shdr,
1118 ".gnu.prelink_undo",
1119 NULL) != NULL);
1120 } else self->adjust_symbols = 0;
1121
1122 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1123 struct symbol *f;
1124 const char *elf_name = elf_sym__name(&sym, symstrs);
1125 char *demangled = NULL;
1126 int is_label = elf_sym__is_label(&sym);
1127 const char *section_name;
1128
1129 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1130 strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1131 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1132
1133 if (!is_label && !elf_sym__is_a(&sym, map->type))
1134 continue;
1135
1136 /* Reject ARM ELF "mapping symbols": these aren't unique and
1137 * don't identify functions, so will confuse the profile
1138 * output: */
1139 if (ehdr.e_machine == EM_ARM) {
1140 if (!strcmp(elf_name, "$a") ||
1141 !strcmp(elf_name, "$d") ||
1142 !strcmp(elf_name, "$t"))
1143 continue;
1144 }
1145
1146 if (opdsec && sym.st_shndx == opdidx) {
1147 u32 offset = sym.st_value - opdshdr.sh_addr;
1148 u64 *opd = opddata->d_buf + offset;
1149 sym.st_value = *opd;
1150 sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1151 }
1152
1153 sec = elf_getscn(elf, sym.st_shndx);
1154 if (!sec)
1155 goto out_elf_end;
1156
1157 gelf_getshdr(sec, &shdr);
1158
1159 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1160 continue;
1161
1162 section_name = elf_sec__name(&shdr, secstrs);
1163
1164 /* On ARM, symbols for thumb functions have 1 added to
1165 * the symbol address as a flag - remove it */
1166 if ((ehdr.e_machine == EM_ARM) &&
1167 (map->type == MAP__FUNCTION) &&
1168 (sym.st_value & 1))
1169 --sym.st_value;
1170
1171 if (self->kernel != DSO_TYPE_USER || kmodule) {
1172 char dso_name[PATH_MAX];
1173
1174 if (strcmp(section_name,
1175 (curr_dso->short_name +
1176 self->short_name_len)) == 0)
1177 goto new_symbol;
1178
1179 if (strcmp(section_name, ".text") == 0) {
1180 curr_map = map;
1181 curr_dso = self;
1182 goto new_symbol;
1183 }
1184
1185 snprintf(dso_name, sizeof(dso_name),
1186 "%s%s", self->short_name, section_name);
1187
1188 curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1189 if (curr_map == NULL) {
1190 u64 start = sym.st_value;
1191
1192 if (kmodule)
1193 start += map->start + shdr.sh_offset;
1194
1195 curr_dso = dso__new(dso_name);
1196 if (curr_dso == NULL)
1197 goto out_elf_end;
1198 curr_dso->kernel = self->kernel;
1199 curr_dso->long_name = self->long_name;
1200 curr_dso->long_name_len = self->long_name_len;
1201 curr_map = map__new2(start, curr_dso,
1202 map->type);
1203 if (curr_map == NULL) {
1204 dso__delete(curr_dso);
1205 goto out_elf_end;
1206 }
1207 curr_map->map_ip = identity__map_ip;
1208 curr_map->unmap_ip = identity__map_ip;
1209 curr_dso->symtab_type = self->symtab_type;
1210 map_groups__insert(kmap->kmaps, curr_map);
1211 dsos__add(&self->node, curr_dso);
1212 dso__set_loaded(curr_dso, map->type);
1213 } else
1214 curr_dso = curr_map->dso;
1215
1216 goto new_symbol;
1217 }
1218
1219 if (curr_dso->adjust_symbols) {
1220 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1221 "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1222 (u64)sym.st_value, (u64)shdr.sh_addr,
1223 (u64)shdr.sh_offset);
1224 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1225 }
1226 /*
1227 * We need to figure out if the object was created from C++ sources
1228 * DWARF DW_compile_unit has this, but we don't always have access
1229 * to it...
1230 */
1231 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1232 if (demangled != NULL)
1233 elf_name = demangled;
1234 new_symbol:
1235 f = symbol__new(sym.st_value, sym.st_size,
1236 GELF_ST_BIND(sym.st_info), elf_name);
1237 free(demangled);
1238 if (!f)
1239 goto out_elf_end;
1240
1241 if (filter && filter(curr_map, f))
1242 symbol__delete(f);
1243 else {
1244 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1245 nr++;
1246 }
1247 }
1248
1249 /*
1250 * For misannotated, zeroed, ASM function sizes.
1251 */
1252 if (nr > 0) {
1253 symbols__fixup_end(&self->symbols[map->type]);
1254 if (kmap) {
1255 /*
1256 * We need to fixup this here too because we create new
1257 * maps here, for things like vsyscall sections.
1258 */
1259 __map_groups__fixup_end(kmap->kmaps, map->type);
1260 }
1261 }
1262 err = nr;
1263 out_elf_end:
1264 elf_end(elf);
1265 out_close:
1266 return err;
1267 }
1268
1269 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1270 {
1271 return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1272 }
1273
1274 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1275 {
1276 bool have_build_id = false;
1277 struct dso *pos;
1278
1279 list_for_each_entry(pos, head, node) {
1280 if (with_hits && !pos->hit)
1281 continue;
1282 if (pos->has_build_id) {
1283 have_build_id = true;
1284 continue;
1285 }
1286 if (filename__read_build_id(pos->long_name, pos->build_id,
1287 sizeof(pos->build_id)) > 0) {
1288 have_build_id = true;
1289 pos->has_build_id = true;
1290 }
1291 }
1292
1293 return have_build_id;
1294 }
1295
1296 /*
1297 * Align offset to 4 bytes as needed for note name and descriptor data.
1298 */
1299 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1300
1301 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1302 {
1303 int err = -1;
1304 GElf_Ehdr ehdr;
1305 GElf_Shdr shdr;
1306 Elf_Data *data;
1307 Elf_Scn *sec;
1308 Elf_Kind ek;
1309 void *ptr;
1310
1311 if (size < BUILD_ID_SIZE)
1312 goto out;
1313
1314 ek = elf_kind(elf);
1315 if (ek != ELF_K_ELF)
1316 goto out;
1317
1318 if (gelf_getehdr(elf, &ehdr) == NULL) {
1319 pr_err("%s: cannot get elf header.\n", __func__);
1320 goto out;
1321 }
1322
1323 sec = elf_section_by_name(elf, &ehdr, &shdr,
1324 ".note.gnu.build-id", NULL);
1325 if (sec == NULL) {
1326 sec = elf_section_by_name(elf, &ehdr, &shdr,
1327 ".notes", NULL);
1328 if (sec == NULL)
1329 goto out;
1330 }
1331
1332 data = elf_getdata(sec, NULL);
1333 if (data == NULL)
1334 goto out;
1335
1336 ptr = data->d_buf;
1337 while (ptr < (data->d_buf + data->d_size)) {
1338 GElf_Nhdr *nhdr = ptr;
1339 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1340 descsz = NOTE_ALIGN(nhdr->n_descsz);
1341 const char *name;
1342
1343 ptr += sizeof(*nhdr);
1344 name = ptr;
1345 ptr += namesz;
1346 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1347 nhdr->n_namesz == sizeof("GNU")) {
1348 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1349 memcpy(bf, ptr, BUILD_ID_SIZE);
1350 err = BUILD_ID_SIZE;
1351 break;
1352 }
1353 }
1354 ptr += descsz;
1355 }
1356
1357 out:
1358 return err;
1359 }
1360
1361 int filename__read_build_id(const char *filename, void *bf, size_t size)
1362 {
1363 int fd, err = -1;
1364 Elf *elf;
1365
1366 if (size < BUILD_ID_SIZE)
1367 goto out;
1368
1369 fd = open(filename, O_RDONLY);
1370 if (fd < 0)
1371 goto out;
1372
1373 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1374 if (elf == NULL) {
1375 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1376 goto out_close;
1377 }
1378
1379 err = elf_read_build_id(elf, bf, size);
1380
1381 elf_end(elf);
1382 out_close:
1383 close(fd);
1384 out:
1385 return err;
1386 }
1387
1388 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1389 {
1390 int fd, err = -1;
1391
1392 if (size < BUILD_ID_SIZE)
1393 goto out;
1394
1395 fd = open(filename, O_RDONLY);
1396 if (fd < 0)
1397 goto out;
1398
1399 while (1) {
1400 char bf[BUFSIZ];
1401 GElf_Nhdr nhdr;
1402 int namesz, descsz;
1403
1404 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1405 break;
1406
1407 namesz = NOTE_ALIGN(nhdr.n_namesz);
1408 descsz = NOTE_ALIGN(nhdr.n_descsz);
1409 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1410 nhdr.n_namesz == sizeof("GNU")) {
1411 if (read(fd, bf, namesz) != namesz)
1412 break;
1413 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1414 if (read(fd, build_id,
1415 BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1416 err = 0;
1417 break;
1418 }
1419 } else if (read(fd, bf, descsz) != descsz)
1420 break;
1421 } else {
1422 int n = namesz + descsz;
1423 if (read(fd, bf, n) != n)
1424 break;
1425 }
1426 }
1427 close(fd);
1428 out:
1429 return err;
1430 }
1431
1432 char dso__symtab_origin(const struct dso *self)
1433 {
1434 static const char origin[] = {
1435 [SYMTAB__KALLSYMS] = 'k',
1436 [SYMTAB__JAVA_JIT] = 'j',
1437 [SYMTAB__BUILD_ID_CACHE] = 'B',
1438 [SYMTAB__FEDORA_DEBUGINFO] = 'f',
1439 [SYMTAB__UBUNTU_DEBUGINFO] = 'u',
1440 [SYMTAB__BUILDID_DEBUGINFO] = 'b',
1441 [SYMTAB__SYSTEM_PATH_DSO] = 'd',
1442 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1443 [SYMTAB__GUEST_KALLSYMS] = 'g',
1444 [SYMTAB__GUEST_KMODULE] = 'G',
1445 };
1446
1447 if (self == NULL || self->symtab_type == SYMTAB__NOT_FOUND)
1448 return '!';
1449 return origin[self->symtab_type];
1450 }
1451
1452 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1453 {
1454 int size = PATH_MAX;
1455 char *name;
1456 int ret = -1;
1457 int fd;
1458 struct machine *machine;
1459 const char *root_dir;
1460 int want_symtab;
1461
1462 dso__set_loaded(self, map->type);
1463
1464 if (self->kernel == DSO_TYPE_KERNEL)
1465 return dso__load_kernel_sym(self, map, filter);
1466 else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1467 return dso__load_guest_kernel_sym(self, map, filter);
1468
1469 if (map->groups && map->groups->machine)
1470 machine = map->groups->machine;
1471 else
1472 machine = NULL;
1473
1474 name = malloc(size);
1475 if (!name)
1476 return -1;
1477
1478 self->adjust_symbols = 0;
1479
1480 if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1481 ret = dso__load_perf_map(self, map, filter);
1482 self->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1483 SYMTAB__NOT_FOUND;
1484 return ret;
1485 }
1486
1487 /* Iterate over candidate debug images.
1488 * On the first pass, only load images if they have a full symtab.
1489 * Failing that, do a second pass where we accept .dynsym also
1490 */
1491 want_symtab = 1;
1492 restart:
1493 for (self->symtab_type = SYMTAB__BUILD_ID_CACHE;
1494 self->symtab_type != SYMTAB__NOT_FOUND;
1495 self->symtab_type++) {
1496 switch (self->symtab_type) {
1497 case SYMTAB__BUILD_ID_CACHE:
1498 /* skip the locally configured cache if a symfs is given */
1499 if (symbol_conf.symfs[0] ||
1500 (dso__build_id_filename(self, name, size) == NULL)) {
1501 continue;
1502 }
1503 break;
1504 case SYMTAB__FEDORA_DEBUGINFO:
1505 snprintf(name, size, "%s/usr/lib/debug%s.debug",
1506 symbol_conf.symfs, self->long_name);
1507 break;
1508 case SYMTAB__UBUNTU_DEBUGINFO:
1509 snprintf(name, size, "%s/usr/lib/debug%s",
1510 symbol_conf.symfs, self->long_name);
1511 break;
1512 case SYMTAB__BUILDID_DEBUGINFO: {
1513 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1514
1515 if (!self->has_build_id)
1516 continue;
1517
1518 build_id__sprintf(self->build_id,
1519 sizeof(self->build_id),
1520 build_id_hex);
1521 snprintf(name, size,
1522 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1523 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1524 }
1525 break;
1526 case SYMTAB__SYSTEM_PATH_DSO:
1527 snprintf(name, size, "%s%s",
1528 symbol_conf.symfs, self->long_name);
1529 break;
1530 case SYMTAB__GUEST_KMODULE:
1531 if (map->groups && machine)
1532 root_dir = machine->root_dir;
1533 else
1534 root_dir = "";
1535 snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1536 root_dir, self->long_name);
1537 break;
1538
1539 case SYMTAB__SYSTEM_PATH_KMODULE:
1540 snprintf(name, size, "%s%s", symbol_conf.symfs,
1541 self->long_name);
1542 break;
1543 default:;
1544 }
1545
1546 /* Name is now the name of the next image to try */
1547 fd = open(name, O_RDONLY);
1548 if (fd < 0)
1549 continue;
1550
1551 ret = dso__load_sym(self, map, name, fd, filter, 0,
1552 want_symtab);
1553 close(fd);
1554
1555 /*
1556 * Some people seem to have debuginfo files _WITHOUT_ debug
1557 * info!?!?
1558 */
1559 if (!ret)
1560 continue;
1561
1562 if (ret > 0) {
1563 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1564 if (nr_plt > 0)
1565 ret += nr_plt;
1566 break;
1567 }
1568 }
1569
1570 /*
1571 * If we wanted a full symtab but no image had one,
1572 * relax our requirements and repeat the search.
1573 */
1574 if (ret <= 0 && want_symtab) {
1575 want_symtab = 0;
1576 goto restart;
1577 }
1578
1579 free(name);
1580 if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1581 return 0;
1582 return ret;
1583 }
1584
1585 struct map *map_groups__find_by_name(struct map_groups *self,
1586 enum map_type type, const char *name)
1587 {
1588 struct rb_node *nd;
1589
1590 for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1591 struct map *map = rb_entry(nd, struct map, rb_node);
1592
1593 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1594 return map;
1595 }
1596
1597 return NULL;
1598 }
1599
1600 static int dso__kernel_module_get_build_id(struct dso *self,
1601 const char *root_dir)
1602 {
1603 char filename[PATH_MAX];
1604 /*
1605 * kernel module short names are of the form "[module]" and
1606 * we need just "module" here.
1607 */
1608 const char *name = self->short_name + 1;
1609
1610 snprintf(filename, sizeof(filename),
1611 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1612 root_dir, (int)strlen(name) - 1, name);
1613
1614 if (sysfs__read_build_id(filename, self->build_id,
1615 sizeof(self->build_id)) == 0)
1616 self->has_build_id = true;
1617
1618 return 0;
1619 }
1620
1621 static int map_groups__set_modules_path_dir(struct map_groups *self,
1622 const char *dir_name)
1623 {
1624 struct dirent *dent;
1625 DIR *dir = opendir(dir_name);
1626 int ret = 0;
1627
1628 if (!dir) {
1629 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1630 return -1;
1631 }
1632
1633 while ((dent = readdir(dir)) != NULL) {
1634 char path[PATH_MAX];
1635 struct stat st;
1636
1637 /*sshfs might return bad dent->d_type, so we have to stat*/
1638 sprintf(path, "%s/%s", dir_name, dent->d_name);
1639 if (stat(path, &st))
1640 continue;
1641
1642 if (S_ISDIR(st.st_mode)) {
1643 if (!strcmp(dent->d_name, ".") ||
1644 !strcmp(dent->d_name, ".."))
1645 continue;
1646
1647 snprintf(path, sizeof(path), "%s/%s",
1648 dir_name, dent->d_name);
1649 ret = map_groups__set_modules_path_dir(self, path);
1650 if (ret < 0)
1651 goto out;
1652 } else {
1653 char *dot = strrchr(dent->d_name, '.'),
1654 dso_name[PATH_MAX];
1655 struct map *map;
1656 char *long_name;
1657
1658 if (dot == NULL || strcmp(dot, ".ko"))
1659 continue;
1660 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1661 (int)(dot - dent->d_name), dent->d_name);
1662
1663 strxfrchar(dso_name, '-', '_');
1664 map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1665 if (map == NULL)
1666 continue;
1667
1668 snprintf(path, sizeof(path), "%s/%s",
1669 dir_name, dent->d_name);
1670
1671 long_name = strdup(path);
1672 if (long_name == NULL) {
1673 ret = -1;
1674 goto out;
1675 }
1676 dso__set_long_name(map->dso, long_name);
1677 map->dso->lname_alloc = 1;
1678 dso__kernel_module_get_build_id(map->dso, "");
1679 }
1680 }
1681
1682 out:
1683 closedir(dir);
1684 return ret;
1685 }
1686
1687 static char *get_kernel_version(const char *root_dir)
1688 {
1689 char version[PATH_MAX];
1690 FILE *file;
1691 char *name, *tmp;
1692 const char *prefix = "Linux version ";
1693
1694 sprintf(version, "%s/proc/version", root_dir);
1695 file = fopen(version, "r");
1696 if (!file)
1697 return NULL;
1698
1699 version[0] = '\0';
1700 tmp = fgets(version, sizeof(version), file);
1701 fclose(file);
1702
1703 name = strstr(version, prefix);
1704 if (!name)
1705 return NULL;
1706 name += strlen(prefix);
1707 tmp = strchr(name, ' ');
1708 if (tmp)
1709 *tmp = '\0';
1710
1711 return strdup(name);
1712 }
1713
1714 static int machine__set_modules_path(struct machine *self)
1715 {
1716 char *version;
1717 char modules_path[PATH_MAX];
1718
1719 version = get_kernel_version(self->root_dir);
1720 if (!version)
1721 return -1;
1722
1723 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1724 self->root_dir, version);
1725 free(version);
1726
1727 return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1728 }
1729
1730 /*
1731 * Constructor variant for modules (where we know from /proc/modules where
1732 * they are loaded) and for vmlinux, where only after we load all the
1733 * symbols we'll know where it starts and ends.
1734 */
1735 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1736 {
1737 struct map *self = calloc(1, (sizeof(*self) +
1738 (dso->kernel ? sizeof(struct kmap) : 0)));
1739 if (self != NULL) {
1740 /*
1741 * ->end will be filled after we load all the symbols
1742 */
1743 map__init(self, type, start, 0, 0, dso);
1744 }
1745
1746 return self;
1747 }
1748
1749 struct map *machine__new_module(struct machine *self, u64 start,
1750 const char *filename)
1751 {
1752 struct map *map;
1753 struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1754
1755 if (dso == NULL)
1756 return NULL;
1757
1758 map = map__new2(start, dso, MAP__FUNCTION);
1759 if (map == NULL)
1760 return NULL;
1761
1762 if (machine__is_host(self))
1763 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1764 else
1765 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1766 map_groups__insert(&self->kmaps, map);
1767 return map;
1768 }
1769
1770 static int machine__create_modules(struct machine *self)
1771 {
1772 char *line = NULL;
1773 size_t n;
1774 FILE *file;
1775 struct map *map;
1776 const char *modules;
1777 char path[PATH_MAX];
1778
1779 if (machine__is_default_guest(self))
1780 modules = symbol_conf.default_guest_modules;
1781 else {
1782 sprintf(path, "%s/proc/modules", self->root_dir);
1783 modules = path;
1784 }
1785
1786 file = fopen(modules, "r");
1787 if (file == NULL)
1788 return -1;
1789
1790 while (!feof(file)) {
1791 char name[PATH_MAX];
1792 u64 start;
1793 char *sep;
1794 int line_len;
1795
1796 line_len = getline(&line, &n, file);
1797 if (line_len < 0)
1798 break;
1799
1800 if (!line)
1801 goto out_failure;
1802
1803 line[--line_len] = '\0'; /* \n */
1804
1805 sep = strrchr(line, 'x');
1806 if (sep == NULL)
1807 continue;
1808
1809 hex2u64(sep + 1, &start);
1810
1811 sep = strchr(line, ' ');
1812 if (sep == NULL)
1813 continue;
1814
1815 *sep = '\0';
1816
1817 snprintf(name, sizeof(name), "[%s]", line);
1818 map = machine__new_module(self, start, name);
1819 if (map == NULL)
1820 goto out_delete_line;
1821 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1822 }
1823
1824 free(line);
1825 fclose(file);
1826
1827 return machine__set_modules_path(self);
1828
1829 out_delete_line:
1830 free(line);
1831 out_failure:
1832 return -1;
1833 }
1834
1835 int dso__load_vmlinux(struct dso *self, struct map *map,
1836 const char *vmlinux, symbol_filter_t filter)
1837 {
1838 int err = -1, fd;
1839 char symfs_vmlinux[PATH_MAX];
1840
1841 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1842 symbol_conf.symfs, vmlinux);
1843 fd = open(symfs_vmlinux, O_RDONLY);
1844 if (fd < 0)
1845 return -1;
1846
1847 dso__set_long_name(self, (char *)vmlinux);
1848 dso__set_loaded(self, map->type);
1849 err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
1850 close(fd);
1851
1852 if (err > 0)
1853 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1854
1855 return err;
1856 }
1857
1858 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1859 symbol_filter_t filter)
1860 {
1861 int i, err = 0;
1862 char *filename;
1863
1864 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1865 vmlinux_path__nr_entries + 1);
1866
1867 filename = dso__build_id_filename(self, NULL, 0);
1868 if (filename != NULL) {
1869 err = dso__load_vmlinux(self, map, filename, filter);
1870 if (err > 0) {
1871 dso__set_long_name(self, filename);
1872 goto out;
1873 }
1874 free(filename);
1875 }
1876
1877 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1878 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1879 if (err > 0) {
1880 dso__set_long_name(self, strdup(vmlinux_path[i]));
1881 break;
1882 }
1883 }
1884 out:
1885 return err;
1886 }
1887
1888 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1889 symbol_filter_t filter)
1890 {
1891 int err;
1892 const char *kallsyms_filename = NULL;
1893 char *kallsyms_allocated_filename = NULL;
1894 /*
1895 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1896 * it and only it, reporting errors to the user if it cannot be used.
1897 *
1898 * For instance, try to analyse an ARM perf.data file _without_ a
1899 * build-id, or if the user specifies the wrong path to the right
1900 * vmlinux file, obviously we can't fallback to another vmlinux (a
1901 * x86_86 one, on the machine where analysis is being performed, say),
1902 * or worse, /proc/kallsyms.
1903 *
1904 * If the specified file _has_ a build-id and there is a build-id
1905 * section in the perf.data file, we will still do the expected
1906 * validation in dso__load_vmlinux and will bail out if they don't
1907 * match.
1908 */
1909 if (symbol_conf.kallsyms_name != NULL) {
1910 kallsyms_filename = symbol_conf.kallsyms_name;
1911 goto do_kallsyms;
1912 }
1913
1914 if (symbol_conf.vmlinux_name != NULL) {
1915 err = dso__load_vmlinux(self, map,
1916 symbol_conf.vmlinux_name, filter);
1917 if (err > 0) {
1918 dso__set_long_name(self,
1919 strdup(symbol_conf.vmlinux_name));
1920 goto out_fixup;
1921 }
1922 return err;
1923 }
1924
1925 if (vmlinux_path != NULL) {
1926 err = dso__load_vmlinux_path(self, map, filter);
1927 if (err > 0)
1928 goto out_fixup;
1929 }
1930
1931 /* do not try local files if a symfs was given */
1932 if (symbol_conf.symfs[0] != 0)
1933 return -1;
1934
1935 /*
1936 * Say the kernel DSO was created when processing the build-id header table,
1937 * we have a build-id, so check if it is the same as the running kernel,
1938 * using it if it is.
1939 */
1940 if (self->has_build_id) {
1941 u8 kallsyms_build_id[BUILD_ID_SIZE];
1942 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1943
1944 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1945 sizeof(kallsyms_build_id)) == 0) {
1946 if (dso__build_id_equal(self, kallsyms_build_id)) {
1947 kallsyms_filename = "/proc/kallsyms";
1948 goto do_kallsyms;
1949 }
1950 }
1951 /*
1952 * Now look if we have it on the build-id cache in
1953 * $HOME/.debug/[kernel.kallsyms].
1954 */
1955 build_id__sprintf(self->build_id, sizeof(self->build_id),
1956 sbuild_id);
1957
1958 if (asprintf(&kallsyms_allocated_filename,
1959 "%s/.debug/[kernel.kallsyms]/%s",
1960 getenv("HOME"), sbuild_id) == -1) {
1961 pr_err("Not enough memory for kallsyms file lookup\n");
1962 return -1;
1963 }
1964
1965 kallsyms_filename = kallsyms_allocated_filename;
1966
1967 if (access(kallsyms_filename, F_OK)) {
1968 pr_err("No kallsyms or vmlinux with build-id %s "
1969 "was found\n", sbuild_id);
1970 free(kallsyms_allocated_filename);
1971 return -1;
1972 }
1973 } else {
1974 /*
1975 * Last resort, if we don't have a build-id and couldn't find
1976 * any vmlinux file, try the running kernel kallsyms table.
1977 */
1978 kallsyms_filename = "/proc/kallsyms";
1979 }
1980
1981 do_kallsyms:
1982 err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1983 if (err > 0)
1984 pr_debug("Using %s for symbols\n", kallsyms_filename);
1985 free(kallsyms_allocated_filename);
1986
1987 if (err > 0) {
1988 out_fixup:
1989 if (kallsyms_filename != NULL)
1990 dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1991 map__fixup_start(map);
1992 map__fixup_end(map);
1993 }
1994
1995 return err;
1996 }
1997
1998 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1999 symbol_filter_t filter)
2000 {
2001 int err;
2002 const char *kallsyms_filename = NULL;
2003 struct machine *machine;
2004 char path[PATH_MAX];
2005
2006 if (!map->groups) {
2007 pr_debug("Guest kernel map hasn't the point to groups\n");
2008 return -1;
2009 }
2010 machine = map->groups->machine;
2011
2012 if (machine__is_default_guest(machine)) {
2013 /*
2014 * if the user specified a vmlinux filename, use it and only
2015 * it, reporting errors to the user if it cannot be used.
2016 * Or use file guest_kallsyms inputted by user on commandline
2017 */
2018 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2019 err = dso__load_vmlinux(self, map,
2020 symbol_conf.default_guest_vmlinux_name, filter);
2021 goto out_try_fixup;
2022 }
2023
2024 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2025 if (!kallsyms_filename)
2026 return -1;
2027 } else {
2028 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2029 kallsyms_filename = path;
2030 }
2031
2032 err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
2033 if (err > 0)
2034 pr_debug("Using %s for symbols\n", kallsyms_filename);
2035
2036 out_try_fixup:
2037 if (err > 0) {
2038 if (kallsyms_filename != NULL) {
2039 machine__mmap_name(machine, path, sizeof(path));
2040 dso__set_long_name(self, strdup(path));
2041 }
2042 map__fixup_start(map);
2043 map__fixup_end(map);
2044 }
2045
2046 return err;
2047 }
2048
2049 static void dsos__add(struct list_head *head, struct dso *dso)
2050 {
2051 list_add_tail(&dso->node, head);
2052 }
2053
2054 static struct dso *dsos__find(struct list_head *head, const char *name)
2055 {
2056 struct dso *pos;
2057
2058 list_for_each_entry(pos, head, node)
2059 if (strcmp(pos->long_name, name) == 0)
2060 return pos;
2061 return NULL;
2062 }
2063
2064 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2065 {
2066 struct dso *dso = dsos__find(head, name);
2067
2068 if (!dso) {
2069 dso = dso__new(name);
2070 if (dso != NULL) {
2071 dsos__add(head, dso);
2072 dso__set_basename(dso);
2073 }
2074 }
2075
2076 return dso;
2077 }
2078
2079 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2080 {
2081 struct dso *pos;
2082 size_t ret = 0;
2083
2084 list_for_each_entry(pos, head, node) {
2085 int i;
2086 for (i = 0; i < MAP__NR_TYPES; ++i)
2087 ret += dso__fprintf(pos, i, fp);
2088 }
2089
2090 return ret;
2091 }
2092
2093 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2094 {
2095 struct rb_node *nd;
2096 size_t ret = 0;
2097
2098 for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2099 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2100 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2101 ret += __dsos__fprintf(&pos->user_dsos, fp);
2102 }
2103
2104 return ret;
2105 }
2106
2107 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2108 bool with_hits)
2109 {
2110 struct dso *pos;
2111 size_t ret = 0;
2112
2113 list_for_each_entry(pos, head, node) {
2114 if (with_hits && !pos->hit)
2115 continue;
2116 ret += dso__fprintf_buildid(pos, fp);
2117 ret += fprintf(fp, " %s\n", pos->long_name);
2118 }
2119 return ret;
2120 }
2121
2122 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2123 {
2124 return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2125 __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2126 }
2127
2128 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2129 {
2130 struct rb_node *nd;
2131 size_t ret = 0;
2132
2133 for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2134 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2135 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2136 }
2137 return ret;
2138 }
2139
2140 struct dso *dso__new_kernel(const char *name)
2141 {
2142 struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2143
2144 if (self != NULL) {
2145 dso__set_short_name(self, "[kernel]");
2146 self->kernel = DSO_TYPE_KERNEL;
2147 }
2148
2149 return self;
2150 }
2151
2152 static struct dso *dso__new_guest_kernel(struct machine *machine,
2153 const char *name)
2154 {
2155 char bf[PATH_MAX];
2156 struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2157
2158 if (self != NULL) {
2159 dso__set_short_name(self, "[guest.kernel]");
2160 self->kernel = DSO_TYPE_GUEST_KERNEL;
2161 }
2162
2163 return self;
2164 }
2165
2166 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2167 {
2168 char path[PATH_MAX];
2169
2170 if (machine__is_default_guest(machine))
2171 return;
2172 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2173 if (sysfs__read_build_id(path, self->build_id,
2174 sizeof(self->build_id)) == 0)
2175 self->has_build_id = true;
2176 }
2177
2178 static struct dso *machine__create_kernel(struct machine *self)
2179 {
2180 const char *vmlinux_name = NULL;
2181 struct dso *kernel;
2182
2183 if (machine__is_host(self)) {
2184 vmlinux_name = symbol_conf.vmlinux_name;
2185 kernel = dso__new_kernel(vmlinux_name);
2186 } else {
2187 if (machine__is_default_guest(self))
2188 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2189 kernel = dso__new_guest_kernel(self, vmlinux_name);
2190 }
2191
2192 if (kernel != NULL) {
2193 dso__read_running_kernel_build_id(kernel, self);
2194 dsos__add(&self->kernel_dsos, kernel);
2195 }
2196 return kernel;
2197 }
2198
2199 struct process_args {
2200 u64 start;
2201 };
2202
2203 static int symbol__in_kernel(void *arg, const char *name,
2204 char type __used, u64 start, u64 end __used)
2205 {
2206 struct process_args *args = arg;
2207
2208 if (strchr(name, '['))
2209 return 0;
2210
2211 args->start = start;
2212 return 1;
2213 }
2214
2215 /* Figure out the start address of kernel map from /proc/kallsyms */
2216 static u64 machine__get_kernel_start_addr(struct machine *machine)
2217 {
2218 const char *filename;
2219 char path[PATH_MAX];
2220 struct process_args args;
2221
2222 if (machine__is_host(machine)) {
2223 filename = "/proc/kallsyms";
2224 } else {
2225 if (machine__is_default_guest(machine))
2226 filename = (char *)symbol_conf.default_guest_kallsyms;
2227 else {
2228 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2229 filename = path;
2230 }
2231 }
2232
2233 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2234 return 0;
2235
2236 return args.start;
2237 }
2238
2239 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2240 {
2241 enum map_type type;
2242 u64 start = machine__get_kernel_start_addr(self);
2243
2244 for (type = 0; type < MAP__NR_TYPES; ++type) {
2245 struct kmap *kmap;
2246
2247 self->vmlinux_maps[type] = map__new2(start, kernel, type);
2248 if (self->vmlinux_maps[type] == NULL)
2249 return -1;
2250
2251 self->vmlinux_maps[type]->map_ip =
2252 self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2253
2254 kmap = map__kmap(self->vmlinux_maps[type]);
2255 kmap->kmaps = &self->kmaps;
2256 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2257 }
2258
2259 return 0;
2260 }
2261
2262 void machine__destroy_kernel_maps(struct machine *self)
2263 {
2264 enum map_type type;
2265
2266 for (type = 0; type < MAP__NR_TYPES; ++type) {
2267 struct kmap *kmap;
2268
2269 if (self->vmlinux_maps[type] == NULL)
2270 continue;
2271
2272 kmap = map__kmap(self->vmlinux_maps[type]);
2273 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2274 if (kmap->ref_reloc_sym) {
2275 /*
2276 * ref_reloc_sym is shared among all maps, so free just
2277 * on one of them.
2278 */
2279 if (type == MAP__FUNCTION) {
2280 free((char *)kmap->ref_reloc_sym->name);
2281 kmap->ref_reloc_sym->name = NULL;
2282 free(kmap->ref_reloc_sym);
2283 }
2284 kmap->ref_reloc_sym = NULL;
2285 }
2286
2287 map__delete(self->vmlinux_maps[type]);
2288 self->vmlinux_maps[type] = NULL;
2289 }
2290 }
2291
2292 int machine__create_kernel_maps(struct machine *self)
2293 {
2294 struct dso *kernel = machine__create_kernel(self);
2295
2296 if (kernel == NULL ||
2297 __machine__create_kernel_maps(self, kernel) < 0)
2298 return -1;
2299
2300 if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2301 pr_debug("Problems creating module maps, continuing anyway...\n");
2302 /*
2303 * Now that we have all the maps created, just set the ->end of them:
2304 */
2305 map_groups__fixup_end(&self->kmaps);
2306 return 0;
2307 }
2308
2309 static void vmlinux_path__exit(void)
2310 {
2311 while (--vmlinux_path__nr_entries >= 0) {
2312 free(vmlinux_path[vmlinux_path__nr_entries]);
2313 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2314 }
2315
2316 free(vmlinux_path);
2317 vmlinux_path = NULL;
2318 }
2319
2320 static int vmlinux_path__init(void)
2321 {
2322 struct utsname uts;
2323 char bf[PATH_MAX];
2324
2325 vmlinux_path = malloc(sizeof(char *) * 5);
2326 if (vmlinux_path == NULL)
2327 return -1;
2328
2329 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2330 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2331 goto out_fail;
2332 ++vmlinux_path__nr_entries;
2333 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2334 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2335 goto out_fail;
2336 ++vmlinux_path__nr_entries;
2337
2338 /* only try running kernel version if no symfs was given */
2339 if (symbol_conf.symfs[0] != 0)
2340 return 0;
2341
2342 if (uname(&uts) < 0)
2343 return -1;
2344
2345 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2346 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2347 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2348 goto out_fail;
2349 ++vmlinux_path__nr_entries;
2350 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2351 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2352 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2353 goto out_fail;
2354 ++vmlinux_path__nr_entries;
2355 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2356 uts.release);
2357 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2358 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2359 goto out_fail;
2360 ++vmlinux_path__nr_entries;
2361
2362 return 0;
2363
2364 out_fail:
2365 vmlinux_path__exit();
2366 return -1;
2367 }
2368
2369 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2370 {
2371 int i;
2372 size_t printed = 0;
2373 struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2374
2375 if (kdso->has_build_id) {
2376 char filename[PATH_MAX];
2377 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2378 printed += fprintf(fp, "[0] %s\n", filename);
2379 }
2380
2381 for (i = 0; i < vmlinux_path__nr_entries; ++i)
2382 printed += fprintf(fp, "[%d] %s\n",
2383 i + kdso->has_build_id, vmlinux_path[i]);
2384
2385 return printed;
2386 }
2387
2388 static int setup_list(struct strlist **list, const char *list_str,
2389 const char *list_name)
2390 {
2391 if (list_str == NULL)
2392 return 0;
2393
2394 *list = strlist__new(true, list_str);
2395 if (!*list) {
2396 pr_err("problems parsing %s list\n", list_name);
2397 return -1;
2398 }
2399 return 0;
2400 }
2401
2402 int symbol__init(void)
2403 {
2404 const char *symfs;
2405
2406 if (symbol_conf.initialized)
2407 return 0;
2408
2409 symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2410
2411 elf_version(EV_CURRENT);
2412 if (symbol_conf.sort_by_name)
2413 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2414 sizeof(struct symbol));
2415
2416 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2417 return -1;
2418
2419 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2420 pr_err("'.' is the only non valid --field-separator argument\n");
2421 return -1;
2422 }
2423
2424 if (setup_list(&symbol_conf.dso_list,
2425 symbol_conf.dso_list_str, "dso") < 0)
2426 return -1;
2427
2428 if (setup_list(&symbol_conf.comm_list,
2429 symbol_conf.comm_list_str, "comm") < 0)
2430 goto out_free_dso_list;
2431
2432 if (setup_list(&symbol_conf.sym_list,
2433 symbol_conf.sym_list_str, "symbol") < 0)
2434 goto out_free_comm_list;
2435
2436 /*
2437 * A path to symbols of "/" is identical to ""
2438 * reset here for simplicity.
2439 */
2440 symfs = realpath(symbol_conf.symfs, NULL);
2441 if (symfs == NULL)
2442 symfs = symbol_conf.symfs;
2443 if (strcmp(symfs, "/") == 0)
2444 symbol_conf.symfs = "";
2445 if (symfs != symbol_conf.symfs)
2446 free((void *)symfs);
2447
2448 symbol_conf.initialized = true;
2449 return 0;
2450
2451 out_free_dso_list:
2452 strlist__delete(symbol_conf.dso_list);
2453 out_free_comm_list:
2454 strlist__delete(symbol_conf.comm_list);
2455 return -1;
2456 }
2457
2458 void symbol__exit(void)
2459 {
2460 if (!symbol_conf.initialized)
2461 return;
2462 strlist__delete(symbol_conf.sym_list);
2463 strlist__delete(symbol_conf.dso_list);
2464 strlist__delete(symbol_conf.comm_list);
2465 vmlinux_path__exit();
2466 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2467 symbol_conf.initialized = false;
2468 }
2469
2470 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2471 {
2472 struct machine *machine = machines__findnew(self, pid);
2473
2474 if (machine == NULL)
2475 return -1;
2476
2477 return machine__create_kernel_maps(machine);
2478 }
2479
2480 static int hex(char ch)
2481 {
2482 if ((ch >= '0') && (ch <= '9'))
2483 return ch - '0';
2484 if ((ch >= 'a') && (ch <= 'f'))
2485 return ch - 'a' + 10;
2486 if ((ch >= 'A') && (ch <= 'F'))
2487 return ch - 'A' + 10;
2488 return -1;
2489 }
2490
2491 /*
2492 * While we find nice hex chars, build a long_val.
2493 * Return number of chars processed.
2494 */
2495 int hex2u64(const char *ptr, u64 *long_val)
2496 {
2497 const char *p = ptr;
2498 *long_val = 0;
2499
2500 while (*p) {
2501 const int hex_val = hex(*p);
2502
2503 if (hex_val < 0)
2504 break;
2505
2506 *long_val = (*long_val << 4) | hex_val;
2507 p++;
2508 }
2509
2510 return p - ptr;
2511 }
2512
2513 char *strxfrchar(char *s, char from, char to)
2514 {
2515 char *p = s;
2516
2517 while ((p = strchr(p, from)) != NULL)
2518 *p++ = to;
2519
2520 return s;
2521 }
2522
2523 int machines__create_guest_kernel_maps(struct rb_root *self)
2524 {
2525 int ret = 0;
2526 struct dirent **namelist = NULL;
2527 int i, items = 0;
2528 char path[PATH_MAX];
2529 pid_t pid;
2530
2531 if (symbol_conf.default_guest_vmlinux_name ||
2532 symbol_conf.default_guest_modules ||
2533 symbol_conf.default_guest_kallsyms) {
2534 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2535 }
2536
2537 if (symbol_conf.guestmount) {
2538 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2539 if (items <= 0)
2540 return -ENOENT;
2541 for (i = 0; i < items; i++) {
2542 if (!isdigit(namelist[i]->d_name[0])) {
2543 /* Filter out . and .. */
2544 continue;
2545 }
2546 pid = atoi(namelist[i]->d_name);
2547 sprintf(path, "%s/%s/proc/kallsyms",
2548 symbol_conf.guestmount,
2549 namelist[i]->d_name);
2550 ret = access(path, R_OK);
2551 if (ret) {
2552 pr_debug("Can't access file %s\n", path);
2553 goto failure;
2554 }
2555 machines__create_kernel_maps(self, pid);
2556 }
2557 failure:
2558 free(namelist);
2559 }
2560
2561 return ret;
2562 }
2563
2564 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2565 {
2566 struct rb_node *next = rb_first(self);
2567
2568 while (next) {
2569 struct machine *pos = rb_entry(next, struct machine, rb_node);
2570
2571 next = rb_next(&pos->rb_node);
2572 rb_erase(&pos->rb_node, self);
2573 machine__delete(pos);
2574 }
2575 }
2576
2577 int machine__load_kallsyms(struct machine *self, const char *filename,
2578 enum map_type type, symbol_filter_t filter)
2579 {
2580 struct map *map = self->vmlinux_maps[type];
2581 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2582
2583 if (ret > 0) {
2584 dso__set_loaded(map->dso, type);
2585 /*
2586 * Since /proc/kallsyms will have multiple sessions for the
2587 * kernel, with modules between them, fixup the end of all
2588 * sections.
2589 */
2590 __map_groups__fixup_end(&self->kmaps, type);
2591 }
2592
2593 return ret;
2594 }
2595
2596 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2597 symbol_filter_t filter)
2598 {
2599 struct map *map = self->vmlinux_maps[type];
2600 int ret = dso__load_vmlinux_path(map->dso, map, filter);
2601
2602 if (ret > 0) {
2603 dso__set_loaded(map->dso, type);
2604 map__reloc_vmlinux(map);
2605 }
2606
2607 return ret;
2608 }
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