22 #include <sys/utsname.h>
25 #define KSYM_NAME_LEN 256
28 #ifndef NT_GNU_BUILD_ID
29 #define NT_GNU_BUILD_ID 3
32 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
33 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
34 static void dsos__add(struct list_head *head, struct dso *dso);
35 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
36 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
37 symbol_filter_t filter);
38 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
39 symbol_filter_t filter);
40 static int vmlinux_path__nr_entries;
41 static char **vmlinux_path;
43 struct symbol_conf symbol_conf = {
44 .exclude_other = true,
46 .try_vmlinux_path = true,
51 int dso__name_len(const struct dso *dso)
54 return strlen("[unknown]");
56 return dso->long_name_len;
58 return dso->short_name_len;
61 bool dso__loaded(const struct dso *dso, enum map_type type)
63 return dso->loaded & (1 << type);
66 bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
68 return dso->sorted_by_name & (1 << type);
71 static void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
73 dso->sorted_by_name |= (1 << type);
76 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
78 symbol_type = toupper(symbol_type);
82 return symbol_type == 'T' || symbol_type == 'W';
84 return symbol_type == 'D';
90 static int prefix_underscores_count(const char *str)
92 const char *tail = str;
103 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
108 /* Prefer a symbol with non zero length */
109 a = syma->end - syma->start;
110 b = symb->end - symb->start;
111 if ((b == 0) && (a > 0))
113 else if ((a == 0) && (b > 0))
116 /* Prefer a non weak symbol over a weak one */
117 a = syma->binding == STB_WEAK;
118 b = symb->binding == STB_WEAK;
124 /* Prefer a global symbol over a non global one */
125 a = syma->binding == STB_GLOBAL;
126 b = symb->binding == STB_GLOBAL;
132 /* Prefer a symbol with less underscores */
133 a = prefix_underscores_count(syma->name);
134 b = prefix_underscores_count(symb->name);
140 /* If all else fails, choose the symbol with the longest name */
141 if (strlen(syma->name) >= strlen(symb->name))
147 static void symbols__fixup_duplicate(struct rb_root *symbols)
150 struct symbol *curr, *next;
152 nd = rb_first(symbols);
155 curr = rb_entry(nd, struct symbol, rb_node);
157 nd = rb_next(&curr->rb_node);
158 next = rb_entry(nd, struct symbol, rb_node);
163 if (curr->start != next->start)
166 if (choose_best_symbol(curr, next) == SYMBOL_A) {
167 rb_erase(&next->rb_node, symbols);
170 nd = rb_next(&curr->rb_node);
171 rb_erase(&curr->rb_node, symbols);
176 static void symbols__fixup_end(struct rb_root *symbols)
178 struct rb_node *nd, *prevnd = rb_first(symbols);
179 struct symbol *curr, *prev;
184 curr = rb_entry(prevnd, struct symbol, rb_node);
186 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
188 curr = rb_entry(nd, struct symbol, rb_node);
190 if (prev->end == prev->start && prev->end != curr->start)
191 prev->end = curr->start - 1;
195 if (curr->end == curr->start)
196 curr->end = roundup(curr->start, 4096);
199 static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
201 struct map *prev, *curr;
202 struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
207 curr = rb_entry(prevnd, struct map, rb_node);
209 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
211 curr = rb_entry(nd, struct map, rb_node);
212 prev->end = curr->start - 1;
216 * We still haven't the actual symbols, so guess the
217 * last map final address.
222 static void map_groups__fixup_end(struct map_groups *mg)
225 for (i = 0; i < MAP__NR_TYPES; ++i)
226 __map_groups__fixup_end(mg, i);
229 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
232 size_t namelen = strlen(name) + 1;
233 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
234 sizeof(*sym) + namelen));
238 if (symbol_conf.priv_size)
239 sym = ((void *)sym) + symbol_conf.priv_size;
242 sym->end = len ? start + len - 1 : start;
243 sym->binding = binding;
244 sym->namelen = namelen - 1;
246 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
247 __func__, name, start, sym->end);
248 memcpy(sym->name, name, namelen);
253 void symbol__delete(struct symbol *sym)
255 free(((void *)sym) - symbol_conf.priv_size);
258 static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
260 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
261 sym->start, sym->end,
262 sym->binding == STB_GLOBAL ? 'g' :
263 sym->binding == STB_LOCAL ? 'l' : 'w',
267 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
268 const struct addr_location *al, FILE *fp)
270 unsigned long offset;
273 if (sym && sym->name) {
274 length = fprintf(fp, "%s", sym->name);
276 offset = al->addr - sym->start;
277 length += fprintf(fp, "+0x%lx", offset);
281 return fprintf(fp, "[unknown]");
284 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
286 return symbol__fprintf_symname_offs(sym, NULL, fp);
289 void dso__set_long_name(struct dso *dso, char *name)
293 dso->long_name = name;
294 dso->long_name_len = strlen(name);
297 static void dso__set_short_name(struct dso *dso, const char *name)
301 dso->short_name = name;
302 dso->short_name_len = strlen(name);
305 static void dso__set_basename(struct dso *dso)
307 dso__set_short_name(dso, basename(dso->long_name));
310 struct dso *dso__new(const char *name)
312 struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
316 strcpy(dso->name, name);
317 dso__set_long_name(dso, dso->name);
318 dso__set_short_name(dso, dso->name);
319 for (i = 0; i < MAP__NR_TYPES; ++i)
320 dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
321 dso->symtab_type = SYMTAB__NOT_FOUND;
323 dso->sorted_by_name = 0;
324 dso->has_build_id = 0;
325 dso->kernel = DSO_TYPE_USER;
326 INIT_LIST_HEAD(&dso->node);
332 static void symbols__delete(struct rb_root *symbols)
335 struct rb_node *next = rb_first(symbols);
338 pos = rb_entry(next, struct symbol, rb_node);
339 next = rb_next(&pos->rb_node);
340 rb_erase(&pos->rb_node, symbols);
345 void dso__delete(struct dso *dso)
348 for (i = 0; i < MAP__NR_TYPES; ++i)
349 symbols__delete(&dso->symbols[i]);
350 if (dso->sname_alloc)
351 free((char *)dso->short_name);
352 if (dso->lname_alloc)
353 free(dso->long_name);
357 void dso__set_build_id(struct dso *dso, void *build_id)
359 memcpy(dso->build_id, build_id, sizeof(dso->build_id));
360 dso->has_build_id = 1;
363 static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
365 struct rb_node **p = &symbols->rb_node;
366 struct rb_node *parent = NULL;
367 const u64 ip = sym->start;
372 s = rb_entry(parent, struct symbol, rb_node);
378 rb_link_node(&sym->rb_node, parent, p);
379 rb_insert_color(&sym->rb_node, symbols);
382 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
389 n = symbols->rb_node;
392 struct symbol *s = rb_entry(n, struct symbol, rb_node);
396 else if (ip > s->end)
405 struct symbol_name_rb_node {
406 struct rb_node rb_node;
410 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
412 struct rb_node **p = &symbols->rb_node;
413 struct rb_node *parent = NULL;
414 struct symbol_name_rb_node *symn, *s;
416 symn = container_of(sym, struct symbol_name_rb_node, sym);
420 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
421 if (strcmp(sym->name, s->sym.name) < 0)
426 rb_link_node(&symn->rb_node, parent, p);
427 rb_insert_color(&symn->rb_node, symbols);
430 static void symbols__sort_by_name(struct rb_root *symbols,
431 struct rb_root *source)
435 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
436 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
437 symbols__insert_by_name(symbols, pos);
441 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
449 n = symbols->rb_node;
452 struct symbol_name_rb_node *s;
455 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
456 cmp = strcmp(name, s->sym.name);
469 struct symbol *dso__find_symbol(struct dso *dso,
470 enum map_type type, u64 addr)
472 return symbols__find(&dso->symbols[type], addr);
475 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
478 return symbols__find_by_name(&dso->symbol_names[type], name);
481 void dso__sort_by_name(struct dso *dso, enum map_type type)
483 dso__set_sorted_by_name(dso, type);
484 return symbols__sort_by_name(&dso->symbol_names[type],
485 &dso->symbols[type]);
488 int build_id__sprintf(const u8 *build_id, int len, char *bf)
491 const u8 *raw = build_id;
494 for (i = 0; i < len; ++i) {
495 sprintf(bid, "%02x", *raw);
500 return raw - build_id;
503 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
505 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
507 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
508 return fprintf(fp, "%s", sbuild_id);
511 size_t dso__fprintf_symbols_by_name(struct dso *dso,
512 enum map_type type, FILE *fp)
516 struct symbol_name_rb_node *pos;
518 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
519 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
520 fprintf(fp, "%s\n", pos->sym.name);
526 size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
529 size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
531 if (dso->short_name != dso->long_name)
532 ret += fprintf(fp, "%s, ", dso->long_name);
533 ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
534 dso->loaded ? "" : "NOT ");
535 ret += dso__fprintf_buildid(dso, fp);
536 ret += fprintf(fp, ")\n");
537 for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
538 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
539 ret += symbol__fprintf(pos, fp);
545 int kallsyms__parse(const char *filename, void *arg,
546 int (*process_symbol)(void *arg, const char *name,
547 char type, u64 start, u64 end))
552 FILE *file = fopen(filename, "r");
559 while (!feof(file)) {
565 line_len = getline(&line, &n, file);
566 if (line_len < 0 || !line)
569 line[--line_len] = '\0'; /* \n */
571 len = hex2u64(line, &start);
574 if (len + 2 >= line_len)
577 symbol_type = line[len];
579 symbol_name = line + len;
580 len = line_len - len;
582 if (len >= KSYM_NAME_LEN) {
588 * module symbols are not sorted so we add all
589 * symbols with zero length and rely on
590 * symbols__fixup_end() to fix it up.
592 err = process_symbol(arg, symbol_name,
593 symbol_type, start, start);
606 struct process_kallsyms_args {
611 static u8 kallsyms2elf_type(char type)
616 return isupper(type) ? STB_GLOBAL : STB_LOCAL;
619 static int map__process_kallsym_symbol(void *arg, const char *name,
620 char type, u64 start, u64 end)
623 struct process_kallsyms_args *a = arg;
624 struct rb_root *root = &a->dso->symbols[a->map->type];
626 if (!symbol_type__is_a(type, a->map->type))
629 sym = symbol__new(start, end - start + 1,
630 kallsyms2elf_type(type), name);
634 * We will pass the symbols to the filter later, in
635 * map__split_kallsyms, when we have split the maps per module
637 symbols__insert(root, sym);
643 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
644 * so that we can in the next step set the symbol ->end address and then
645 * call kernel_maps__split_kallsyms.
647 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
650 struct process_kallsyms_args args = { .map = map, .dso = dso, };
651 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
655 * Split the symbols into maps, making sure there are no overlaps, i.e. the
656 * kernel range is broken in several maps, named [kernel].N, as we don't have
657 * the original ELF section names vmlinux have.
659 static int dso__split_kallsyms(struct dso *dso, struct map *map,
660 symbol_filter_t filter)
662 struct map_groups *kmaps = map__kmap(map)->kmaps;
663 struct machine *machine = kmaps->machine;
664 struct map *curr_map = map;
666 int count = 0, moved = 0;
667 struct rb_root *root = &dso->symbols[map->type];
668 struct rb_node *next = rb_first(root);
669 int kernel_range = 0;
674 pos = rb_entry(next, struct symbol, rb_node);
675 next = rb_next(&pos->rb_node);
677 module = strchr(pos->name, '\t');
679 if (!symbol_conf.use_modules)
684 if (strcmp(curr_map->dso->short_name, module)) {
685 if (curr_map != map &&
686 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
687 machine__is_default_guest(machine)) {
689 * We assume all symbols of a module are
690 * continuous in * kallsyms, so curr_map
691 * points to a module and all its
692 * symbols are in its kmap. Mark it as
695 dso__set_loaded(curr_map->dso,
699 curr_map = map_groups__find_by_name(kmaps,
701 if (curr_map == NULL) {
702 pr_debug("%s/proc/{kallsyms,modules} "
703 "inconsistency while looking "
704 "for \"%s\" module!\n",
705 machine->root_dir, module);
710 if (curr_map->dso->loaded &&
711 !machine__is_default_guest(machine))
715 * So that we look just like we get from .ko files,
716 * i.e. not prelinked, relative to map->start.
718 pos->start = curr_map->map_ip(curr_map, pos->start);
719 pos->end = curr_map->map_ip(curr_map, pos->end);
720 } else if (curr_map != map) {
721 char dso_name[PATH_MAX];
729 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
730 snprintf(dso_name, sizeof(dso_name),
734 snprintf(dso_name, sizeof(dso_name),
738 ndso = dso__new(dso_name);
742 ndso->kernel = dso->kernel;
744 curr_map = map__new2(pos->start, ndso, map->type);
745 if (curr_map == NULL) {
750 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
751 map_groups__insert(kmaps, curr_map);
755 if (filter && filter(curr_map, pos)) {
756 discard_symbol: rb_erase(&pos->rb_node, root);
759 if (curr_map != map) {
760 rb_erase(&pos->rb_node, root);
761 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
768 if (curr_map != map &&
769 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
770 machine__is_default_guest(kmaps->machine)) {
771 dso__set_loaded(curr_map->dso, curr_map->type);
774 return count + moved;
777 static bool symbol__restricted_filename(const char *filename,
778 const char *restricted_filename)
780 bool restricted = false;
782 if (symbol_conf.kptr_restrict) {
783 char *r = realpath(filename, NULL);
786 restricted = strcmp(r, restricted_filename) == 0;
795 int dso__load_kallsyms(struct dso *dso, const char *filename,
796 struct map *map, symbol_filter_t filter)
798 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
801 if (dso__load_all_kallsyms(dso, filename, map) < 0)
804 symbols__fixup_duplicate(&dso->symbols[map->type]);
805 symbols__fixup_end(&dso->symbols[map->type]);
807 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
808 dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
810 dso->symtab_type = SYMTAB__KALLSYMS;
812 return dso__split_kallsyms(dso, map, filter);
815 static int dso__load_perf_map(struct dso *dso, struct map *map,
816 symbol_filter_t filter)
823 file = fopen(dso->long_name, "r");
827 while (!feof(file)) {
832 line_len = getline(&line, &n, file);
839 line[--line_len] = '\0'; /* \n */
841 len = hex2u64(line, &start);
844 if (len + 2 >= line_len)
847 len += hex2u64(line + len, &size);
850 if (len + 2 >= line_len)
853 sym = symbol__new(start, size, STB_GLOBAL, line + len);
856 goto out_delete_line;
858 if (filter && filter(map, sym))
861 symbols__insert(&dso->symbols[map->type], sym);
878 * elf_symtab__for_each_symbol - iterate thru all the symbols
880 * @syms: struct elf_symtab instance to iterate
882 * @sym: GElf_Sym iterator
884 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
885 for (idx = 0, gelf_getsym(syms, idx, &sym);\
887 idx++, gelf_getsym(syms, idx, &sym))
889 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
891 return GELF_ST_TYPE(sym->st_info);
894 static inline int elf_sym__is_function(const GElf_Sym *sym)
896 return elf_sym__type(sym) == STT_FUNC &&
898 sym->st_shndx != SHN_UNDEF;
901 static inline bool elf_sym__is_object(const GElf_Sym *sym)
903 return elf_sym__type(sym) == STT_OBJECT &&
905 sym->st_shndx != SHN_UNDEF;
908 static inline int elf_sym__is_label(const GElf_Sym *sym)
910 return elf_sym__type(sym) == STT_NOTYPE &&
912 sym->st_shndx != SHN_UNDEF &&
913 sym->st_shndx != SHN_ABS;
916 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
917 const Elf_Data *secstrs)
919 return secstrs->d_buf + shdr->sh_name;
922 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
923 const Elf_Data *secstrs)
925 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
928 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
929 const Elf_Data *secstrs)
931 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
934 static inline const char *elf_sym__name(const GElf_Sym *sym,
935 const Elf_Data *symstrs)
937 return symstrs->d_buf + sym->st_name;
940 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
941 GElf_Shdr *shp, const char *name,
947 while ((sec = elf_nextscn(elf, sec)) != NULL) {
950 gelf_getshdr(sec, shp);
951 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
952 if (!strcmp(name, str)) {
963 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
964 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
966 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
968 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
969 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
971 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
974 * We need to check if we have a .dynsym, so that we can handle the
975 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
976 * .dynsym or .symtab).
977 * And always look at the original dso, not at debuginfo packages, that
978 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
980 static int dso__synthesize_plt_symbols(struct dso *dso, struct map *map,
981 symbol_filter_t filter)
983 uint32_t nr_rel_entries, idx;
988 GElf_Shdr shdr_rel_plt, shdr_dynsym;
989 Elf_Data *reldata, *syms, *symstrs;
990 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
993 char sympltname[1024];
995 int nr = 0, symidx, fd, err = 0;
998 snprintf(name, sizeof(name), "%s%s",
999 symbol_conf.symfs, dso->long_name);
1000 fd = open(name, O_RDONLY);
1004 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1008 if (gelf_getehdr(elf, &ehdr) == NULL)
1011 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
1012 ".dynsym", &dynsym_idx);
1013 if (scn_dynsym == NULL)
1016 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
1018 if (scn_plt_rel == NULL) {
1019 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
1021 if (scn_plt_rel == NULL)
1027 if (shdr_rel_plt.sh_link != dynsym_idx)
1030 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
1034 * Fetch the relocation section to find the idxes to the GOT
1035 * and the symbols in the .dynsym they refer to.
1037 reldata = elf_getdata(scn_plt_rel, NULL);
1038 if (reldata == NULL)
1041 syms = elf_getdata(scn_dynsym, NULL);
1045 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
1046 if (scn_symstrs == NULL)
1049 symstrs = elf_getdata(scn_symstrs, NULL);
1050 if (symstrs == NULL)
1053 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
1054 plt_offset = shdr_plt.sh_offset;
1056 if (shdr_rel_plt.sh_type == SHT_RELA) {
1057 GElf_Rela pos_mem, *pos;
1059 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
1061 symidx = GELF_R_SYM(pos->r_info);
1062 plt_offset += shdr_plt.sh_entsize;
1063 gelf_getsym(syms, symidx, &sym);
1064 snprintf(sympltname, sizeof(sympltname),
1065 "%s@plt", elf_sym__name(&sym, symstrs));
1067 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
1068 STB_GLOBAL, sympltname);
1072 if (filter && filter(map, f))
1075 symbols__insert(&dso->symbols[map->type], f);
1079 } else if (shdr_rel_plt.sh_type == SHT_REL) {
1080 GElf_Rel pos_mem, *pos;
1081 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
1083 symidx = GELF_R_SYM(pos->r_info);
1084 plt_offset += shdr_plt.sh_entsize;
1085 gelf_getsym(syms, symidx, &sym);
1086 snprintf(sympltname, sizeof(sympltname),
1087 "%s@plt", elf_sym__name(&sym, symstrs));
1089 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
1090 STB_GLOBAL, sympltname);
1094 if (filter && filter(map, f))
1097 symbols__insert(&dso->symbols[map->type], f);
1112 pr_debug("%s: problems reading %s PLT info.\n",
1113 __func__, dso->long_name);
1117 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
1121 return elf_sym__is_function(sym);
1123 return elf_sym__is_object(sym);
1129 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
1134 return elf_sec__is_text(shdr, secstrs);
1136 return elf_sec__is_data(shdr, secstrs);
1142 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1144 Elf_Scn *sec = NULL;
1148 while ((sec = elf_nextscn(elf, sec)) != NULL) {
1149 gelf_getshdr(sec, &shdr);
1151 if ((addr >= shdr.sh_addr) &&
1152 (addr < (shdr.sh_addr + shdr.sh_size)))
1161 static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
1162 int fd, symbol_filter_t filter, int kmodule,
1165 struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
1166 struct map *curr_map = map;
1167 struct dso *curr_dso = dso;
1168 Elf_Data *symstrs, *secstrs;
1173 GElf_Shdr shdr, opdshdr;
1174 Elf_Data *syms, *opddata = NULL;
1176 Elf_Scn *sec, *sec_strndx, *opdsec;
1181 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1183 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1187 if (gelf_getehdr(elf, &ehdr) == NULL) {
1188 pr_debug("%s: cannot get elf header.\n", __func__);
1192 /* Always reject images with a mismatched build-id: */
1193 if (dso->has_build_id) {
1194 u8 build_id[BUILD_ID_SIZE];
1196 if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0)
1199 if (!dso__build_id_equal(dso, build_id))
1203 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1208 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1213 opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1214 if (opdshdr.sh_type != SHT_PROGBITS)
1217 opddata = elf_rawdata(opdsec, NULL);
1219 syms = elf_getdata(sec, NULL);
1223 sec = elf_getscn(elf, shdr.sh_link);
1227 symstrs = elf_getdata(sec, NULL);
1228 if (symstrs == NULL)
1231 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1232 if (sec_strndx == NULL)
1235 secstrs = elf_getdata(sec_strndx, NULL);
1236 if (secstrs == NULL)
1239 nr_syms = shdr.sh_size / shdr.sh_entsize;
1241 memset(&sym, 0, sizeof(sym));
1242 if (dso->kernel == DSO_TYPE_USER) {
1243 dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1244 elf_section_by_name(elf, &ehdr, &shdr,
1245 ".gnu.prelink_undo",
1248 dso->adjust_symbols = 0;
1250 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1252 const char *elf_name = elf_sym__name(&sym, symstrs);
1253 char *demangled = NULL;
1254 int is_label = elf_sym__is_label(&sym);
1255 const char *section_name;
1257 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1258 strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1259 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1261 if (!is_label && !elf_sym__is_a(&sym, map->type))
1264 /* Reject ARM ELF "mapping symbols": these aren't unique and
1265 * don't identify functions, so will confuse the profile
1267 if (ehdr.e_machine == EM_ARM) {
1268 if (!strcmp(elf_name, "$a") ||
1269 !strcmp(elf_name, "$d") ||
1270 !strcmp(elf_name, "$t"))
1274 if (opdsec && sym.st_shndx == opdidx) {
1275 u32 offset = sym.st_value - opdshdr.sh_addr;
1276 u64 *opd = opddata->d_buf + offset;
1277 sym.st_value = *opd;
1278 sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1281 sec = elf_getscn(elf, sym.st_shndx);
1285 gelf_getshdr(sec, &shdr);
1287 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1290 section_name = elf_sec__name(&shdr, secstrs);
1292 /* On ARM, symbols for thumb functions have 1 added to
1293 * the symbol address as a flag - remove it */
1294 if ((ehdr.e_machine == EM_ARM) &&
1295 (map->type == MAP__FUNCTION) &&
1299 if (dso->kernel != DSO_TYPE_USER || kmodule) {
1300 char dso_name[PATH_MAX];
1302 if (strcmp(section_name,
1303 (curr_dso->short_name +
1304 dso->short_name_len)) == 0)
1307 if (strcmp(section_name, ".text") == 0) {
1313 snprintf(dso_name, sizeof(dso_name),
1314 "%s%s", dso->short_name, section_name);
1316 curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1317 if (curr_map == NULL) {
1318 u64 start = sym.st_value;
1321 start += map->start + shdr.sh_offset;
1323 curr_dso = dso__new(dso_name);
1324 if (curr_dso == NULL)
1326 curr_dso->kernel = dso->kernel;
1327 curr_dso->long_name = dso->long_name;
1328 curr_dso->long_name_len = dso->long_name_len;
1329 curr_map = map__new2(start, curr_dso,
1331 if (curr_map == NULL) {
1332 dso__delete(curr_dso);
1335 curr_map->map_ip = identity__map_ip;
1336 curr_map->unmap_ip = identity__map_ip;
1337 curr_dso->symtab_type = dso->symtab_type;
1338 map_groups__insert(kmap->kmaps, curr_map);
1339 dsos__add(&dso->node, curr_dso);
1340 dso__set_loaded(curr_dso, map->type);
1342 curr_dso = curr_map->dso;
1347 if (curr_dso->adjust_symbols) {
1348 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1349 "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1350 (u64)sym.st_value, (u64)shdr.sh_addr,
1351 (u64)shdr.sh_offset);
1352 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1355 * We need to figure out if the object was created from C++ sources
1356 * DWARF DW_compile_unit has this, but we don't always have access
1359 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1360 if (demangled != NULL)
1361 elf_name = demangled;
1363 f = symbol__new(sym.st_value, sym.st_size,
1364 GELF_ST_BIND(sym.st_info), elf_name);
1369 if (filter && filter(curr_map, f))
1372 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1378 * For misannotated, zeroed, ASM function sizes.
1381 symbols__fixup_duplicate(&dso->symbols[map->type]);
1382 symbols__fixup_end(&dso->symbols[map->type]);
1385 * We need to fixup this here too because we create new
1386 * maps here, for things like vsyscall sections.
1388 __map_groups__fixup_end(kmap->kmaps, map->type);
1398 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1400 return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1403 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1405 bool have_build_id = false;
1408 list_for_each_entry(pos, head, node) {
1409 if (with_hits && !pos->hit)
1411 if (pos->has_build_id) {
1412 have_build_id = true;
1415 if (filename__read_build_id(pos->long_name, pos->build_id,
1416 sizeof(pos->build_id)) > 0) {
1417 have_build_id = true;
1418 pos->has_build_id = true;
1422 return have_build_id;
1426 * Align offset to 4 bytes as needed for note name and descriptor data.
1428 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1430 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1440 if (size < BUILD_ID_SIZE)
1444 if (ek != ELF_K_ELF)
1447 if (gelf_getehdr(elf, &ehdr) == NULL) {
1448 pr_err("%s: cannot get elf header.\n", __func__);
1452 sec = elf_section_by_name(elf, &ehdr, &shdr,
1453 ".note.gnu.build-id", NULL);
1455 sec = elf_section_by_name(elf, &ehdr, &shdr,
1461 data = elf_getdata(sec, NULL);
1466 while (ptr < (data->d_buf + data->d_size)) {
1467 GElf_Nhdr *nhdr = ptr;
1468 size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
1469 descsz = NOTE_ALIGN(nhdr->n_descsz);
1472 ptr += sizeof(*nhdr);
1475 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1476 nhdr->n_namesz == sizeof("GNU")) {
1477 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1478 size_t sz = min(size, descsz);
1479 memcpy(bf, ptr, sz);
1480 memset(bf + sz, 0, size - sz);
1492 int filename__read_build_id(const char *filename, void *bf, size_t size)
1497 if (size < BUILD_ID_SIZE)
1500 fd = open(filename, O_RDONLY);
1504 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1506 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1510 err = elf_read_build_id(elf, bf, size);
1519 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1523 if (size < BUILD_ID_SIZE)
1526 fd = open(filename, O_RDONLY);
1533 size_t namesz, descsz;
1535 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1538 namesz = NOTE_ALIGN(nhdr.n_namesz);
1539 descsz = NOTE_ALIGN(nhdr.n_descsz);
1540 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1541 nhdr.n_namesz == sizeof("GNU")) {
1542 if (read(fd, bf, namesz) != (ssize_t)namesz)
1544 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1545 size_t sz = min(descsz, size);
1546 if (read(fd, build_id, sz) == (ssize_t)sz) {
1547 memset(build_id + sz, 0, size - sz);
1551 } else if (read(fd, bf, descsz) != (ssize_t)descsz)
1554 int n = namesz + descsz;
1555 if (read(fd, bf, n) != n)
1564 char dso__symtab_origin(const struct dso *dso)
1566 static const char origin[] = {
1567 [SYMTAB__KALLSYMS] = 'k',
1568 [SYMTAB__JAVA_JIT] = 'j',
1569 [SYMTAB__BUILD_ID_CACHE] = 'B',
1570 [SYMTAB__FEDORA_DEBUGINFO] = 'f',
1571 [SYMTAB__UBUNTU_DEBUGINFO] = 'u',
1572 [SYMTAB__BUILDID_DEBUGINFO] = 'b',
1573 [SYMTAB__SYSTEM_PATH_DSO] = 'd',
1574 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1575 [SYMTAB__GUEST_KALLSYMS] = 'g',
1576 [SYMTAB__GUEST_KMODULE] = 'G',
1579 if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1581 return origin[dso->symtab_type];
1584 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1586 int size = PATH_MAX;
1590 struct machine *machine;
1591 const char *root_dir;
1594 dso__set_loaded(dso, map->type);
1596 if (dso->kernel == DSO_TYPE_KERNEL)
1597 return dso__load_kernel_sym(dso, map, filter);
1598 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1599 return dso__load_guest_kernel_sym(dso, map, filter);
1601 if (map->groups && map->groups->machine)
1602 machine = map->groups->machine;
1606 name = malloc(size);
1610 dso->adjust_symbols = 0;
1612 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1615 if (lstat(dso->name, &st) < 0)
1618 if (st.st_uid && (st.st_uid != geteuid())) {
1619 pr_warning("File %s not owned by current user or root, "
1620 "ignoring it.\n", dso->name);
1624 ret = dso__load_perf_map(dso, map, filter);
1625 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1630 /* Iterate over candidate debug images.
1631 * On the first pass, only load images if they have a full symtab.
1632 * Failing that, do a second pass where we accept .dynsym also
1636 for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE;
1637 dso->symtab_type != SYMTAB__NOT_FOUND;
1638 dso->symtab_type++) {
1639 switch (dso->symtab_type) {
1640 case SYMTAB__BUILD_ID_CACHE:
1641 /* skip the locally configured cache if a symfs is given */
1642 if (symbol_conf.symfs[0] ||
1643 (dso__build_id_filename(dso, name, size) == NULL)) {
1647 case SYMTAB__FEDORA_DEBUGINFO:
1648 snprintf(name, size, "%s/usr/lib/debug%s.debug",
1649 symbol_conf.symfs, dso->long_name);
1651 case SYMTAB__UBUNTU_DEBUGINFO:
1652 snprintf(name, size, "%s/usr/lib/debug%s",
1653 symbol_conf.symfs, dso->long_name);
1655 case SYMTAB__BUILDID_DEBUGINFO: {
1656 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1658 if (!dso->has_build_id)
1661 build_id__sprintf(dso->build_id,
1662 sizeof(dso->build_id),
1664 snprintf(name, size,
1665 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1666 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1669 case SYMTAB__SYSTEM_PATH_DSO:
1670 snprintf(name, size, "%s%s",
1671 symbol_conf.symfs, dso->long_name);
1673 case SYMTAB__GUEST_KMODULE:
1674 if (map->groups && machine)
1675 root_dir = machine->root_dir;
1678 snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1679 root_dir, dso->long_name);
1682 case SYMTAB__SYSTEM_PATH_KMODULE:
1683 snprintf(name, size, "%s%s", symbol_conf.symfs,
1689 /* Name is now the name of the next image to try */
1690 fd = open(name, O_RDONLY);
1694 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1699 * Some people seem to have debuginfo files _WITHOUT_ debug
1706 int nr_plt = dso__synthesize_plt_symbols(dso, map,
1715 * If we wanted a full symtab but no image had one,
1716 * relax our requirements and repeat the search.
1718 if (ret <= 0 && want_symtab) {
1724 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1729 struct map *map_groups__find_by_name(struct map_groups *mg,
1730 enum map_type type, const char *name)
1734 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1735 struct map *map = rb_entry(nd, struct map, rb_node);
1737 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1744 static int dso__kernel_module_get_build_id(struct dso *dso,
1745 const char *root_dir)
1747 char filename[PATH_MAX];
1749 * kernel module short names are of the form "[module]" and
1750 * we need just "module" here.
1752 const char *name = dso->short_name + 1;
1754 snprintf(filename, sizeof(filename),
1755 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1756 root_dir, (int)strlen(name) - 1, name);
1758 if (sysfs__read_build_id(filename, dso->build_id,
1759 sizeof(dso->build_id)) == 0)
1760 dso->has_build_id = true;
1765 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1766 const char *dir_name)
1768 struct dirent *dent;
1769 DIR *dir = opendir(dir_name);
1773 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1777 while ((dent = readdir(dir)) != NULL) {
1778 char path[PATH_MAX];
1781 /*sshfs might return bad dent->d_type, so we have to stat*/
1782 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
1783 if (stat(path, &st))
1786 if (S_ISDIR(st.st_mode)) {
1787 if (!strcmp(dent->d_name, ".") ||
1788 !strcmp(dent->d_name, ".."))
1791 ret = map_groups__set_modules_path_dir(mg, path);
1795 char *dot = strrchr(dent->d_name, '.'),
1800 if (dot == NULL || strcmp(dot, ".ko"))
1802 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1803 (int)(dot - dent->d_name), dent->d_name);
1805 strxfrchar(dso_name, '-', '_');
1806 map = map_groups__find_by_name(mg, MAP__FUNCTION,
1811 long_name = strdup(path);
1812 if (long_name == NULL) {
1816 dso__set_long_name(map->dso, long_name);
1817 map->dso->lname_alloc = 1;
1818 dso__kernel_module_get_build_id(map->dso, "");
1827 static char *get_kernel_version(const char *root_dir)
1829 char version[PATH_MAX];
1832 const char *prefix = "Linux version ";
1834 sprintf(version, "%s/proc/version", root_dir);
1835 file = fopen(version, "r");
1840 tmp = fgets(version, sizeof(version), file);
1843 name = strstr(version, prefix);
1846 name += strlen(prefix);
1847 tmp = strchr(name, ' ');
1851 return strdup(name);
1854 static int machine__set_modules_path(struct machine *machine)
1857 char modules_path[PATH_MAX];
1859 version = get_kernel_version(machine->root_dir);
1863 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1864 machine->root_dir, version);
1867 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1871 * Constructor variant for modules (where we know from /proc/modules where
1872 * they are loaded) and for vmlinux, where only after we load all the
1873 * symbols we'll know where it starts and ends.
1875 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1877 struct map *map = calloc(1, (sizeof(*map) +
1878 (dso->kernel ? sizeof(struct kmap) : 0)));
1881 * ->end will be filled after we load all the symbols
1883 map__init(map, type, start, 0, 0, dso);
1889 struct map *machine__new_module(struct machine *machine, u64 start,
1890 const char *filename)
1893 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
1898 map = map__new2(start, dso, MAP__FUNCTION);
1902 if (machine__is_host(machine))
1903 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
1905 dso->symtab_type = SYMTAB__GUEST_KMODULE;
1906 map_groups__insert(&machine->kmaps, map);
1910 static int machine__create_modules(struct machine *machine)
1916 const char *modules;
1917 char path[PATH_MAX];
1919 if (machine__is_default_guest(machine))
1920 modules = symbol_conf.default_guest_modules;
1922 sprintf(path, "%s/proc/modules", machine->root_dir);
1926 if (symbol__restricted_filename(path, "/proc/modules"))
1929 file = fopen(modules, "r");
1933 while (!feof(file)) {
1934 char name[PATH_MAX];
1939 line_len = getline(&line, &n, file);
1946 line[--line_len] = '\0'; /* \n */
1948 sep = strrchr(line, 'x');
1952 hex2u64(sep + 1, &start);
1954 sep = strchr(line, ' ');
1960 snprintf(name, sizeof(name), "[%s]", line);
1961 map = machine__new_module(machine, start, name);
1963 goto out_delete_line;
1964 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1970 return machine__set_modules_path(machine);
1978 int dso__load_vmlinux(struct dso *dso, struct map *map,
1979 const char *vmlinux, symbol_filter_t filter)
1982 char symfs_vmlinux[PATH_MAX];
1984 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1985 symbol_conf.symfs, vmlinux);
1986 fd = open(symfs_vmlinux, O_RDONLY);
1990 dso__set_long_name(dso, (char *)vmlinux);
1991 dso__set_loaded(dso, map->type);
1992 err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
1996 pr_debug("Using %s for symbols\n", symfs_vmlinux);
2001 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
2002 symbol_filter_t filter)
2007 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
2008 vmlinux_path__nr_entries + 1);
2010 filename = dso__build_id_filename(dso, NULL, 0);
2011 if (filename != NULL) {
2012 err = dso__load_vmlinux(dso, map, filename, filter);
2014 dso__set_long_name(dso, filename);
2020 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
2021 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
2023 dso__set_long_name(dso, strdup(vmlinux_path[i]));
2031 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
2032 symbol_filter_t filter)
2035 const char *kallsyms_filename = NULL;
2036 char *kallsyms_allocated_filename = NULL;
2038 * Step 1: if the user specified a kallsyms or vmlinux filename, use
2039 * it and only it, reporting errors to the user if it cannot be used.
2041 * For instance, try to analyse an ARM perf.data file _without_ a
2042 * build-id, or if the user specifies the wrong path to the right
2043 * vmlinux file, obviously we can't fallback to another vmlinux (a
2044 * x86_86 one, on the machine where analysis is being performed, say),
2045 * or worse, /proc/kallsyms.
2047 * If the specified file _has_ a build-id and there is a build-id
2048 * section in the perf.data file, we will still do the expected
2049 * validation in dso__load_vmlinux and will bail out if they don't
2052 if (symbol_conf.kallsyms_name != NULL) {
2053 kallsyms_filename = symbol_conf.kallsyms_name;
2057 if (symbol_conf.vmlinux_name != NULL) {
2058 err = dso__load_vmlinux(dso, map,
2059 symbol_conf.vmlinux_name, filter);
2061 dso__set_long_name(dso,
2062 strdup(symbol_conf.vmlinux_name));
2068 if (vmlinux_path != NULL) {
2069 err = dso__load_vmlinux_path(dso, map, filter);
2074 /* do not try local files if a symfs was given */
2075 if (symbol_conf.symfs[0] != 0)
2079 * Say the kernel DSO was created when processing the build-id header table,
2080 * we have a build-id, so check if it is the same as the running kernel,
2081 * using it if it is.
2083 if (dso->has_build_id) {
2084 u8 kallsyms_build_id[BUILD_ID_SIZE];
2085 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
2087 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
2088 sizeof(kallsyms_build_id)) == 0) {
2089 if (dso__build_id_equal(dso, kallsyms_build_id)) {
2090 kallsyms_filename = "/proc/kallsyms";
2095 * Now look if we have it on the build-id cache in
2096 * $HOME/.debug/[kernel.kallsyms].
2098 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
2101 if (asprintf(&kallsyms_allocated_filename,
2102 "%s/.debug/[kernel.kallsyms]/%s",
2103 getenv("HOME"), sbuild_id) == -1) {
2104 pr_err("Not enough memory for kallsyms file lookup\n");
2108 kallsyms_filename = kallsyms_allocated_filename;
2110 if (access(kallsyms_filename, F_OK)) {
2111 pr_err("No kallsyms or vmlinux with build-id %s "
2112 "was found\n", sbuild_id);
2113 free(kallsyms_allocated_filename);
2118 * Last resort, if we don't have a build-id and couldn't find
2119 * any vmlinux file, try the running kernel kallsyms table.
2121 kallsyms_filename = "/proc/kallsyms";
2125 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2127 pr_debug("Using %s for symbols\n", kallsyms_filename);
2128 free(kallsyms_allocated_filename);
2132 if (kallsyms_filename != NULL)
2133 dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2134 map__fixup_start(map);
2135 map__fixup_end(map);
2141 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2142 symbol_filter_t filter)
2145 const char *kallsyms_filename = NULL;
2146 struct machine *machine;
2147 char path[PATH_MAX];
2150 pr_debug("Guest kernel map hasn't the point to groups\n");
2153 machine = map->groups->machine;
2155 if (machine__is_default_guest(machine)) {
2157 * if the user specified a vmlinux filename, use it and only
2158 * it, reporting errors to the user if it cannot be used.
2159 * Or use file guest_kallsyms inputted by user on commandline
2161 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2162 err = dso__load_vmlinux(dso, map,
2163 symbol_conf.default_guest_vmlinux_name, filter);
2167 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2168 if (!kallsyms_filename)
2171 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2172 kallsyms_filename = path;
2175 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2177 pr_debug("Using %s for symbols\n", kallsyms_filename);
2181 if (kallsyms_filename != NULL) {
2182 machine__mmap_name(machine, path, sizeof(path));
2183 dso__set_long_name(dso, strdup(path));
2185 map__fixup_start(map);
2186 map__fixup_end(map);
2192 static void dsos__add(struct list_head *head, struct dso *dso)
2194 list_add_tail(&dso->node, head);
2197 static struct dso *dsos__find(struct list_head *head, const char *name)
2201 list_for_each_entry(pos, head, node)
2202 if (strcmp(pos->long_name, name) == 0)
2207 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2209 struct dso *dso = dsos__find(head, name);
2212 dso = dso__new(name);
2214 dsos__add(head, dso);
2215 dso__set_basename(dso);
2222 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2227 list_for_each_entry(pos, head, node) {
2229 for (i = 0; i < MAP__NR_TYPES; ++i)
2230 ret += dso__fprintf(pos, i, fp);
2236 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2241 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2242 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2243 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2244 ret += __dsos__fprintf(&pos->user_dsos, fp);
2250 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2256 list_for_each_entry(pos, head, node) {
2257 if (with_hits && !pos->hit)
2259 ret += dso__fprintf_buildid(pos, fp);
2260 ret += fprintf(fp, " %s\n", pos->long_name);
2265 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2268 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2269 __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2272 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2273 FILE *fp, bool with_hits)
2278 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2279 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2280 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2286 dso__kernel_findnew(struct machine *machine, const char *name,
2287 const char *short_name, int dso_type)
2290 * The kernel dso could be created by build_id processing.
2292 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
2295 * We need to run this in all cases, since during the build_id
2296 * processing we had no idea this was the kernel dso.
2299 dso__set_short_name(dso, short_name);
2300 dso->kernel = dso_type;
2306 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2308 char path[PATH_MAX];
2310 if (machine__is_default_guest(machine))
2312 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2313 if (sysfs__read_build_id(path, dso->build_id,
2314 sizeof(dso->build_id)) == 0)
2315 dso->has_build_id = true;
2318 static struct dso *machine__get_kernel(struct machine *machine)
2320 const char *vmlinux_name = NULL;
2323 if (machine__is_host(machine)) {
2324 vmlinux_name = symbol_conf.vmlinux_name;
2326 vmlinux_name = "[kernel.kallsyms]";
2328 kernel = dso__kernel_findnew(machine, vmlinux_name,
2334 if (machine__is_default_guest(machine))
2335 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2337 vmlinux_name = machine__mmap_name(machine, bf,
2340 kernel = dso__kernel_findnew(machine, vmlinux_name,
2342 DSO_TYPE_GUEST_KERNEL);
2345 if (kernel != NULL && (!kernel->has_build_id))
2346 dso__read_running_kernel_build_id(kernel, machine);
2351 struct process_args {
2355 static int symbol__in_kernel(void *arg, const char *name,
2356 char type __used, u64 start, u64 end __used)
2358 struct process_args *args = arg;
2360 if (strchr(name, '['))
2363 args->start = start;
2367 /* Figure out the start address of kernel map from /proc/kallsyms */
2368 static u64 machine__get_kernel_start_addr(struct machine *machine)
2370 const char *filename;
2371 char path[PATH_MAX];
2372 struct process_args args;
2374 if (machine__is_host(machine)) {
2375 filename = "/proc/kallsyms";
2377 if (machine__is_default_guest(machine))
2378 filename = (char *)symbol_conf.default_guest_kallsyms;
2380 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2385 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2388 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2394 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2397 u64 start = machine__get_kernel_start_addr(machine);
2399 for (type = 0; type < MAP__NR_TYPES; ++type) {
2402 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2403 if (machine->vmlinux_maps[type] == NULL)
2406 machine->vmlinux_maps[type]->map_ip =
2407 machine->vmlinux_maps[type]->unmap_ip =
2409 kmap = map__kmap(machine->vmlinux_maps[type]);
2410 kmap->kmaps = &machine->kmaps;
2411 map_groups__insert(&machine->kmaps,
2412 machine->vmlinux_maps[type]);
2418 void machine__destroy_kernel_maps(struct machine *machine)
2422 for (type = 0; type < MAP__NR_TYPES; ++type) {
2425 if (machine->vmlinux_maps[type] == NULL)
2428 kmap = map__kmap(machine->vmlinux_maps[type]);
2429 map_groups__remove(&machine->kmaps,
2430 machine->vmlinux_maps[type]);
2431 if (kmap->ref_reloc_sym) {
2433 * ref_reloc_sym is shared among all maps, so free just
2436 if (type == MAP__FUNCTION) {
2437 free((char *)kmap->ref_reloc_sym->name);
2438 kmap->ref_reloc_sym->name = NULL;
2439 free(kmap->ref_reloc_sym);
2441 kmap->ref_reloc_sym = NULL;
2444 map__delete(machine->vmlinux_maps[type]);
2445 machine->vmlinux_maps[type] = NULL;
2449 int machine__create_kernel_maps(struct machine *machine)
2451 struct dso *kernel = machine__get_kernel(machine);
2453 if (kernel == NULL ||
2454 __machine__create_kernel_maps(machine, kernel) < 0)
2457 if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2458 pr_debug("Problems creating module maps, continuing anyway...\n");
2460 * Now that we have all the maps created, just set the ->end of them:
2462 map_groups__fixup_end(&machine->kmaps);
2466 static void vmlinux_path__exit(void)
2468 while (--vmlinux_path__nr_entries >= 0) {
2469 free(vmlinux_path[vmlinux_path__nr_entries]);
2470 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2474 vmlinux_path = NULL;
2477 static int vmlinux_path__init(void)
2482 vmlinux_path = malloc(sizeof(char *) * 5);
2483 if (vmlinux_path == NULL)
2486 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2487 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2489 ++vmlinux_path__nr_entries;
2490 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2491 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2493 ++vmlinux_path__nr_entries;
2495 /* only try running kernel version if no symfs was given */
2496 if (symbol_conf.symfs[0] != 0)
2499 if (uname(&uts) < 0)
2502 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2503 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2504 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2506 ++vmlinux_path__nr_entries;
2507 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2508 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2509 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2511 ++vmlinux_path__nr_entries;
2512 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2514 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2515 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2517 ++vmlinux_path__nr_entries;
2522 vmlinux_path__exit();
2526 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2530 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2532 if (kdso->has_build_id) {
2533 char filename[PATH_MAX];
2534 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2535 printed += fprintf(fp, "[0] %s\n", filename);
2538 for (i = 0; i < vmlinux_path__nr_entries; ++i)
2539 printed += fprintf(fp, "[%d] %s\n",
2540 i + kdso->has_build_id, vmlinux_path[i]);
2545 static int setup_list(struct strlist **list, const char *list_str,
2546 const char *list_name)
2548 if (list_str == NULL)
2551 *list = strlist__new(true, list_str);
2553 pr_err("problems parsing %s list\n", list_name);
2559 static bool symbol__read_kptr_restrict(void)
2563 if (geteuid() != 0) {
2564 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2568 if (fgets(line, sizeof(line), fp) != NULL)
2569 value = atoi(line) != 0;
2578 int symbol__init(void)
2582 if (symbol_conf.initialized)
2585 symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2587 elf_version(EV_CURRENT);
2588 if (symbol_conf.sort_by_name)
2589 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2590 sizeof(struct symbol));
2592 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2595 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2596 pr_err("'.' is the only non valid --field-separator argument\n");
2600 if (setup_list(&symbol_conf.dso_list,
2601 symbol_conf.dso_list_str, "dso") < 0)
2604 if (setup_list(&symbol_conf.comm_list,
2605 symbol_conf.comm_list_str, "comm") < 0)
2606 goto out_free_dso_list;
2608 if (setup_list(&symbol_conf.sym_list,
2609 symbol_conf.sym_list_str, "symbol") < 0)
2610 goto out_free_comm_list;
2613 * A path to symbols of "/" is identical to ""
2614 * reset here for simplicity.
2616 symfs = realpath(symbol_conf.symfs, NULL);
2618 symfs = symbol_conf.symfs;
2619 if (strcmp(symfs, "/") == 0)
2620 symbol_conf.symfs = "";
2621 if (symfs != symbol_conf.symfs)
2622 free((void *)symfs);
2624 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2626 symbol_conf.initialized = true;
2630 strlist__delete(symbol_conf.comm_list);
2632 strlist__delete(symbol_conf.dso_list);
2636 void symbol__exit(void)
2638 if (!symbol_conf.initialized)
2640 strlist__delete(symbol_conf.sym_list);
2641 strlist__delete(symbol_conf.dso_list);
2642 strlist__delete(symbol_conf.comm_list);
2643 vmlinux_path__exit();
2644 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2645 symbol_conf.initialized = false;
2648 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2650 struct machine *machine = machines__findnew(machines, pid);
2652 if (machine == NULL)
2655 return machine__create_kernel_maps(machine);
2658 static int hex(char ch)
2660 if ((ch >= '0') && (ch <= '9'))
2662 if ((ch >= 'a') && (ch <= 'f'))
2663 return ch - 'a' + 10;
2664 if ((ch >= 'A') && (ch <= 'F'))
2665 return ch - 'A' + 10;
2670 * While we find nice hex chars, build a long_val.
2671 * Return number of chars processed.
2673 int hex2u64(const char *ptr, u64 *long_val)
2675 const char *p = ptr;
2679 const int hex_val = hex(*p);
2684 *long_val = (*long_val << 4) | hex_val;
2691 char *strxfrchar(char *s, char from, char to)
2695 while ((p = strchr(p, from)) != NULL)
2701 int machines__create_guest_kernel_maps(struct rb_root *machines)
2704 struct dirent **namelist = NULL;
2706 char path[PATH_MAX];
2709 if (symbol_conf.default_guest_vmlinux_name ||
2710 symbol_conf.default_guest_modules ||
2711 symbol_conf.default_guest_kallsyms) {
2712 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2715 if (symbol_conf.guestmount) {
2716 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2719 for (i = 0; i < items; i++) {
2720 if (!isdigit(namelist[i]->d_name[0])) {
2721 /* Filter out . and .. */
2724 pid = atoi(namelist[i]->d_name);
2725 sprintf(path, "%s/%s/proc/kallsyms",
2726 symbol_conf.guestmount,
2727 namelist[i]->d_name);
2728 ret = access(path, R_OK);
2730 pr_debug("Can't access file %s\n", path);
2733 machines__create_kernel_maps(machines, pid);
2742 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2744 struct rb_node *next = rb_first(machines);
2747 struct machine *pos = rb_entry(next, struct machine, rb_node);
2749 next = rb_next(&pos->rb_node);
2750 rb_erase(&pos->rb_node, machines);
2751 machine__delete(pos);
2755 int machine__load_kallsyms(struct machine *machine, const char *filename,
2756 enum map_type type, symbol_filter_t filter)
2758 struct map *map = machine->vmlinux_maps[type];
2759 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2762 dso__set_loaded(map->dso, type);
2764 * Since /proc/kallsyms will have multiple sessions for the
2765 * kernel, with modules between them, fixup the end of all
2768 __map_groups__fixup_end(&machine->kmaps, type);
2774 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2775 symbol_filter_t filter)
2777 struct map *map = machine->vmlinux_maps[type];
2778 int ret = dso__load_vmlinux_path(map->dso, map, filter);
2781 dso__set_loaded(map->dso, type);
2782 map__reloc_vmlinux(map);