15 #include <sys/utsname.h>
17 #ifndef NT_GNU_BUILD_ID
18 #define NT_GNU_BUILD_ID 3
24 DSO__ORIG_BUILD_ID_CACHE,
33 static void dsos__add(struct list_head *head, struct dso *dso);
34 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
35 static int dso__load_kernel_sym(struct dso *self, struct map *map,
36 symbol_filter_t filter);
37 static int vmlinux_path__nr_entries;
38 static char **vmlinux_path;
40 struct symbol_conf symbol_conf = {
41 .exclude_other = true,
43 .try_vmlinux_path = true,
46 bool dso__loaded(const struct dso *self, enum map_type type)
48 return self->loaded & (1 << type);
51 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
53 return self->sorted_by_name & (1 << type);
56 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
58 self->sorted_by_name |= (1 << type);
61 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
65 return symbol_type == 'T' || symbol_type == 'W';
67 return symbol_type == 'D' || symbol_type == 'd';
73 static void symbols__fixup_end(struct rb_root *self)
75 struct rb_node *nd, *prevnd = rb_first(self);
76 struct symbol *curr, *prev;
81 curr = rb_entry(prevnd, struct symbol, rb_node);
83 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
85 curr = rb_entry(nd, struct symbol, rb_node);
87 if (prev->end == prev->start)
88 prev->end = curr->start - 1;
92 if (curr->end == curr->start)
93 curr->end = roundup(curr->start, 4096);
96 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
98 struct map *prev, *curr;
99 struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
104 curr = rb_entry(prevnd, struct map, rb_node);
106 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
108 curr = rb_entry(nd, struct map, rb_node);
109 prev->end = curr->start - 1;
113 * We still haven't the actual symbols, so guess the
114 * last map final address.
119 static void map_groups__fixup_end(struct map_groups *self)
122 for (i = 0; i < MAP__NR_TYPES; ++i)
123 __map_groups__fixup_end(self, i);
126 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
128 size_t namelen = strlen(name) + 1;
129 struct symbol *self = zalloc(symbol_conf.priv_size +
130 sizeof(*self) + namelen);
134 if (symbol_conf.priv_size)
135 self = ((void *)self) + symbol_conf.priv_size;
138 self->end = len ? start + len - 1 : start;
140 pr_debug4("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
142 memcpy(self->name, name, namelen);
147 void symbol__delete(struct symbol *self)
149 free(((void *)self) - symbol_conf.priv_size);
152 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
154 return fprintf(fp, " %llx-%llx %s\n",
155 self->start, self->end, self->name);
158 void dso__set_long_name(struct dso *self, char *name)
162 self->long_name = name;
163 self->long_name_len = strlen(name);
166 static void dso__set_short_name(struct dso *self, const char *name)
170 self->short_name = name;
171 self->short_name_len = strlen(name);
174 static void dso__set_basename(struct dso *self)
176 dso__set_short_name(self, basename(self->long_name));
179 struct dso *dso__new(const char *name)
181 struct dso *self = zalloc(sizeof(*self) + strlen(name) + 1);
185 strcpy(self->name, name);
186 dso__set_long_name(self, self->name);
187 dso__set_short_name(self, self->name);
188 for (i = 0; i < MAP__NR_TYPES; ++i)
189 self->symbols[i] = self->symbol_names[i] = RB_ROOT;
190 self->slen_calculated = 0;
191 self->origin = DSO__ORIG_NOT_FOUND;
193 self->sorted_by_name = 0;
194 self->has_build_id = 0;
200 static void symbols__delete(struct rb_root *self)
203 struct rb_node *next = rb_first(self);
206 pos = rb_entry(next, struct symbol, rb_node);
207 next = rb_next(&pos->rb_node);
208 rb_erase(&pos->rb_node, self);
213 void dso__delete(struct dso *self)
216 for (i = 0; i < MAP__NR_TYPES; ++i)
217 symbols__delete(&self->symbols[i]);
218 if (self->long_name != self->name)
219 free(self->long_name);
223 void dso__set_build_id(struct dso *self, void *build_id)
225 memcpy(self->build_id, build_id, sizeof(self->build_id));
226 self->has_build_id = 1;
229 static void symbols__insert(struct rb_root *self, struct symbol *sym)
231 struct rb_node **p = &self->rb_node;
232 struct rb_node *parent = NULL;
233 const u64 ip = sym->start;
238 s = rb_entry(parent, struct symbol, rb_node);
244 rb_link_node(&sym->rb_node, parent, p);
245 rb_insert_color(&sym->rb_node, self);
248 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
258 struct symbol *s = rb_entry(n, struct symbol, rb_node);
262 else if (ip > s->end)
271 struct symbol_name_rb_node {
272 struct rb_node rb_node;
276 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
278 struct rb_node **p = &self->rb_node;
279 struct rb_node *parent = NULL;
280 struct symbol_name_rb_node *symn = ((void *)sym) - sizeof(*parent), *s;
284 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
285 if (strcmp(sym->name, s->sym.name) < 0)
290 rb_link_node(&symn->rb_node, parent, p);
291 rb_insert_color(&symn->rb_node, self);
294 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
298 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
299 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
300 symbols__insert_by_name(self, pos);
304 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
314 struct symbol_name_rb_node *s;
317 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
318 cmp = strcmp(name, s->sym.name);
331 struct symbol *dso__find_symbol(struct dso *self,
332 enum map_type type, u64 addr)
334 return symbols__find(&self->symbols[type], addr);
337 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
340 return symbols__find_by_name(&self->symbol_names[type], name);
343 void dso__sort_by_name(struct dso *self, enum map_type type)
345 dso__set_sorted_by_name(self, type);
346 return symbols__sort_by_name(&self->symbol_names[type],
347 &self->symbols[type]);
350 int build_id__sprintf(const u8 *self, int len, char *bf)
353 const u8 *raw = self;
356 for (i = 0; i < len; ++i) {
357 sprintf(bid, "%02x", *raw);
365 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
367 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
369 build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
370 return fprintf(fp, "%s", sbuild_id);
373 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
376 size_t ret = fprintf(fp, "dso: %s (", self->short_name);
378 if (self->short_name != self->long_name)
379 ret += fprintf(fp, "%s, ", self->long_name);
380 ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
381 self->loaded ? "" : "NOT ");
382 ret += dso__fprintf_buildid(self, fp);
383 ret += fprintf(fp, ")\n");
384 for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
385 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
386 ret += symbol__fprintf(pos, fp);
392 int kallsyms__parse(const char *filename, void *arg,
393 int (*process_symbol)(void *arg, const char *name,
394 char type, u64 start))
399 FILE *file = fopen(filename, "r");
404 while (!feof(file)) {
410 line_len = getline(&line, &n, file);
417 line[--line_len] = '\0'; /* \n */
419 len = hex2u64(line, &start);
422 if (len + 2 >= line_len)
425 symbol_type = toupper(line[len]);
426 symbol_name = line + len + 2;
428 err = process_symbol(arg, symbol_name, symbol_type, start);
441 struct process_kallsyms_args {
446 static int map__process_kallsym_symbol(void *arg, const char *name,
447 char type, u64 start)
450 struct process_kallsyms_args *a = arg;
451 struct rb_root *root = &a->dso->symbols[a->map->type];
453 if (!symbol_type__is_a(type, a->map->type))
457 * Will fix up the end later, when we have all symbols sorted.
459 sym = symbol__new(start, 0, name);
464 * We will pass the symbols to the filter later, in
465 * map__split_kallsyms, when we have split the maps per module
467 symbols__insert(root, sym);
472 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
473 * so that we can in the next step set the symbol ->end address and then
474 * call kernel_maps__split_kallsyms.
476 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
479 struct process_kallsyms_args args = { .map = map, .dso = self, };
480 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
484 * Split the symbols into maps, making sure there are no overlaps, i.e. the
485 * kernel range is broken in several maps, named [kernel].N, as we don't have
486 * the original ELF section names vmlinux have.
488 static int dso__split_kallsyms(struct dso *self, struct map *map,
489 symbol_filter_t filter)
491 struct map_groups *kmaps = map__kmap(map)->kmaps;
492 struct map *curr_map = map;
495 struct rb_root *root = &self->symbols[map->type];
496 struct rb_node *next = rb_first(root);
497 int kernel_range = 0;
502 pos = rb_entry(next, struct symbol, rb_node);
503 next = rb_next(&pos->rb_node);
505 module = strchr(pos->name, '\t');
507 if (!symbol_conf.use_modules)
512 if (strcmp(curr_map->dso->short_name, module)) {
513 curr_map = map_groups__find_by_name(kmaps, map->type, module);
514 if (curr_map == NULL) {
515 pr_debug("/proc/{kallsyms,modules} "
516 "inconsistency while looking "
517 "for \"%s\" module!\n", module);
521 if (curr_map->dso->loaded)
525 * So that we look just like we get from .ko files,
526 * i.e. not prelinked, relative to map->start.
528 pos->start = curr_map->map_ip(curr_map, pos->start);
529 pos->end = curr_map->map_ip(curr_map, pos->end);
530 } else if (curr_map != map) {
531 char dso_name[PATH_MAX];
534 snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
537 dso = dso__new(dso_name);
541 curr_map = map__new2(pos->start, dso, map->type);
542 if (curr_map == NULL) {
547 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
548 map_groups__insert(kmaps, curr_map);
552 if (filter && filter(curr_map, pos)) {
553 discard_symbol: rb_erase(&pos->rb_node, root);
556 if (curr_map != map) {
557 rb_erase(&pos->rb_node, root);
558 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
567 int dso__load_kallsyms(struct dso *self, const char *filename,
568 struct map *map, symbol_filter_t filter)
570 if (dso__load_all_kallsyms(self, filename, map) < 0)
573 symbols__fixup_end(&self->symbols[map->type]);
574 self->origin = DSO__ORIG_KERNEL;
576 return dso__split_kallsyms(self, map, filter);
579 static int dso__load_perf_map(struct dso *self, struct map *map,
580 symbol_filter_t filter)
587 file = fopen(self->long_name, "r");
591 while (!feof(file)) {
596 line_len = getline(&line, &n, file);
603 line[--line_len] = '\0'; /* \n */
605 len = hex2u64(line, &start);
608 if (len + 2 >= line_len)
611 len += hex2u64(line + len, &size);
614 if (len + 2 >= line_len)
617 sym = symbol__new(start, size, line + len);
620 goto out_delete_line;
622 if (filter && filter(map, sym))
625 symbols__insert(&self->symbols[map->type], sym);
642 * elf_symtab__for_each_symbol - iterate thru all the symbols
644 * @self: struct elf_symtab instance to iterate
646 * @sym: GElf_Sym iterator
648 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
649 for (idx = 0, gelf_getsym(syms, idx, &sym);\
651 idx++, gelf_getsym(syms, idx, &sym))
653 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
655 return GELF_ST_TYPE(sym->st_info);
658 static inline int elf_sym__is_function(const GElf_Sym *sym)
660 return elf_sym__type(sym) == STT_FUNC &&
662 sym->st_shndx != SHN_UNDEF;
665 static inline bool elf_sym__is_object(const GElf_Sym *sym)
667 return elf_sym__type(sym) == STT_OBJECT &&
669 sym->st_shndx != SHN_UNDEF;
672 static inline int elf_sym__is_label(const GElf_Sym *sym)
674 return elf_sym__type(sym) == STT_NOTYPE &&
676 sym->st_shndx != SHN_UNDEF &&
677 sym->st_shndx != SHN_ABS;
680 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
681 const Elf_Data *secstrs)
683 return secstrs->d_buf + shdr->sh_name;
686 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
687 const Elf_Data *secstrs)
689 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
692 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
693 const Elf_Data *secstrs)
695 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
698 static inline const char *elf_sym__name(const GElf_Sym *sym,
699 const Elf_Data *symstrs)
701 return symstrs->d_buf + sym->st_name;
704 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
705 GElf_Shdr *shp, const char *name,
711 while ((sec = elf_nextscn(elf, sec)) != NULL) {
714 gelf_getshdr(sec, shp);
715 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
716 if (!strcmp(name, str)) {
727 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
728 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
730 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
732 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
733 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
735 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
738 * We need to check if we have a .dynsym, so that we can handle the
739 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
740 * .dynsym or .symtab).
741 * And always look at the original dso, not at debuginfo packages, that
742 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
744 static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
745 symbol_filter_t filter)
747 uint32_t nr_rel_entries, idx;
752 GElf_Shdr shdr_rel_plt, shdr_dynsym;
753 Elf_Data *reldata, *syms, *symstrs;
754 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
757 char sympltname[1024];
759 int nr = 0, symidx, fd, err = 0;
761 fd = open(self->long_name, O_RDONLY);
765 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
769 if (gelf_getehdr(elf, &ehdr) == NULL)
772 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
773 ".dynsym", &dynsym_idx);
774 if (scn_dynsym == NULL)
777 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
779 if (scn_plt_rel == NULL) {
780 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
782 if (scn_plt_rel == NULL)
788 if (shdr_rel_plt.sh_link != dynsym_idx)
791 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
795 * Fetch the relocation section to find the idxes to the GOT
796 * and the symbols in the .dynsym they refer to.
798 reldata = elf_getdata(scn_plt_rel, NULL);
802 syms = elf_getdata(scn_dynsym, NULL);
806 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
807 if (scn_symstrs == NULL)
810 symstrs = elf_getdata(scn_symstrs, NULL);
814 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
815 plt_offset = shdr_plt.sh_offset;
817 if (shdr_rel_plt.sh_type == SHT_RELA) {
818 GElf_Rela pos_mem, *pos;
820 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
822 symidx = GELF_R_SYM(pos->r_info);
823 plt_offset += shdr_plt.sh_entsize;
824 gelf_getsym(syms, symidx, &sym);
825 snprintf(sympltname, sizeof(sympltname),
826 "%s@plt", elf_sym__name(&sym, symstrs));
828 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
833 if (filter && filter(map, f))
836 symbols__insert(&self->symbols[map->type], f);
840 } else if (shdr_rel_plt.sh_type == SHT_REL) {
841 GElf_Rel pos_mem, *pos;
842 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
844 symidx = GELF_R_SYM(pos->r_info);
845 plt_offset += shdr_plt.sh_entsize;
846 gelf_getsym(syms, symidx, &sym);
847 snprintf(sympltname, sizeof(sympltname),
848 "%s@plt", elf_sym__name(&sym, symstrs));
850 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
855 if (filter && filter(map, f))
858 symbols__insert(&self->symbols[map->type], f);
873 pr_warning("%s: problems reading %s PLT info.\n",
874 __func__, self->long_name);
878 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
882 return elf_sym__is_function(self);
884 return elf_sym__is_object(self);
890 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
894 return elf_sec__is_text(self, secstrs);
896 return elf_sec__is_data(self, secstrs);
902 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
903 int fd, symbol_filter_t filter, int kmodule)
905 struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
906 struct map *curr_map = map;
907 struct dso *curr_dso = self;
908 Elf_Data *symstrs, *secstrs;
916 Elf_Scn *sec, *sec_strndx;
920 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
922 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
926 if (gelf_getehdr(elf, &ehdr) == NULL) {
927 pr_err("%s: cannot get elf header.\n", __func__);
931 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
933 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
938 syms = elf_getdata(sec, NULL);
942 sec = elf_getscn(elf, shdr.sh_link);
946 symstrs = elf_getdata(sec, NULL);
950 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
951 if (sec_strndx == NULL)
954 secstrs = elf_getdata(sec_strndx, NULL);
958 nr_syms = shdr.sh_size / shdr.sh_entsize;
960 memset(&sym, 0, sizeof(sym));
962 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
963 elf_section_by_name(elf, &ehdr, &shdr,
966 } else self->adjust_symbols = 0;
968 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
970 const char *elf_name = elf_sym__name(&sym, symstrs);
971 char *demangled = NULL;
972 int is_label = elf_sym__is_label(&sym);
973 const char *section_name;
975 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
976 strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
977 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
979 if (!is_label && !elf_sym__is_a(&sym, map->type))
982 sec = elf_getscn(elf, sym.st_shndx);
986 gelf_getshdr(sec, &shdr);
988 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
991 section_name = elf_sec__name(&shdr, secstrs);
993 if (self->kernel || kmodule) {
994 char dso_name[PATH_MAX];
996 if (strcmp(section_name,
997 (curr_dso->short_name +
998 self->short_name_len)) == 0)
1001 if (strcmp(section_name, ".text") == 0) {
1007 snprintf(dso_name, sizeof(dso_name),
1008 "%s%s", self->short_name, section_name);
1010 curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1011 if (curr_map == NULL) {
1012 u64 start = sym.st_value;
1015 start += map->start + shdr.sh_offset;
1017 curr_dso = dso__new(dso_name);
1018 if (curr_dso == NULL)
1020 curr_map = map__new2(start, curr_dso,
1022 if (curr_map == NULL) {
1023 dso__delete(curr_dso);
1026 curr_map->map_ip = identity__map_ip;
1027 curr_map->unmap_ip = identity__map_ip;
1028 curr_dso->origin = DSO__ORIG_KERNEL;
1029 map_groups__insert(kmap->kmaps, curr_map);
1030 dsos__add(&dsos__kernel, curr_dso);
1031 dso__set_loaded(curr_dso, map->type);
1033 curr_dso = curr_map->dso;
1038 if (curr_dso->adjust_symbols) {
1039 pr_debug4("%s: adjusting symbol: st_value: %#Lx "
1040 "sh_addr: %#Lx sh_offset: %#Lx\n", __func__,
1041 (u64)sym.st_value, (u64)shdr.sh_addr,
1042 (u64)shdr.sh_offset);
1043 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1046 * We need to figure out if the object was created from C++ sources
1047 * DWARF DW_compile_unit has this, but we don't always have access
1050 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1051 if (demangled != NULL)
1052 elf_name = demangled;
1054 f = symbol__new(sym.st_value, sym.st_size, elf_name);
1059 if (filter && filter(curr_map, f))
1062 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1068 * For misannotated, zeroed, ASM function sizes.
1071 symbols__fixup_end(&self->symbols[map->type]);
1074 * We need to fixup this here too because we create new
1075 * maps here, for things like vsyscall sections.
1077 __map_groups__fixup_end(kmap->kmaps, map->type);
1087 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1089 return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1092 static bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1094 bool have_build_id = false;
1097 list_for_each_entry(pos, head, node) {
1098 if (with_hits && !pos->hit)
1100 if (filename__read_build_id(pos->long_name, pos->build_id,
1101 sizeof(pos->build_id)) > 0) {
1102 have_build_id = true;
1103 pos->has_build_id = true;
1107 return have_build_id;
1110 bool dsos__read_build_ids(bool with_hits)
1112 bool kbuildids = __dsos__read_build_ids(&dsos__kernel, with_hits),
1113 ubuildids = __dsos__read_build_ids(&dsos__user, with_hits);
1114 return kbuildids || ubuildids;
1118 * Align offset to 4 bytes as needed for note name and descriptor data.
1120 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1122 int filename__read_build_id(const char *filename, void *bf, size_t size)
1133 if (size < BUILD_ID_SIZE)
1136 fd = open(filename, O_RDONLY);
1140 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1142 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1147 if (ek != ELF_K_ELF)
1150 if (gelf_getehdr(elf, &ehdr) == NULL) {
1151 pr_err("%s: cannot get elf header.\n", __func__);
1155 sec = elf_section_by_name(elf, &ehdr, &shdr,
1156 ".note.gnu.build-id", NULL);
1158 sec = elf_section_by_name(elf, &ehdr, &shdr,
1164 data = elf_getdata(sec, NULL);
1169 while (ptr < (data->d_buf + data->d_size)) {
1170 GElf_Nhdr *nhdr = ptr;
1171 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1172 descsz = NOTE_ALIGN(nhdr->n_descsz);
1175 ptr += sizeof(*nhdr);
1178 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1179 nhdr->n_namesz == sizeof("GNU")) {
1180 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1181 memcpy(bf, ptr, BUILD_ID_SIZE);
1182 err = BUILD_ID_SIZE;
1196 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1200 if (size < BUILD_ID_SIZE)
1203 fd = open(filename, O_RDONLY);
1212 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1215 namesz = NOTE_ALIGN(nhdr.n_namesz);
1216 descsz = NOTE_ALIGN(nhdr.n_descsz);
1217 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1218 nhdr.n_namesz == sizeof("GNU")) {
1219 if (read(fd, bf, namesz) != namesz)
1221 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1222 if (read(fd, build_id,
1223 BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1227 } else if (read(fd, bf, descsz) != descsz)
1230 int n = namesz + descsz;
1231 if (read(fd, bf, n) != n)
1240 char dso__symtab_origin(const struct dso *self)
1242 static const char origin[] = {
1243 [DSO__ORIG_KERNEL] = 'k',
1244 [DSO__ORIG_JAVA_JIT] = 'j',
1245 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1246 [DSO__ORIG_FEDORA] = 'f',
1247 [DSO__ORIG_UBUNTU] = 'u',
1248 [DSO__ORIG_BUILDID] = 'b',
1249 [DSO__ORIG_DSO] = 'd',
1250 [DSO__ORIG_KMODULE] = 'K',
1253 if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1255 return origin[self->origin];
1258 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1260 int size = PATH_MAX;
1262 u8 build_id[BUILD_ID_SIZE];
1263 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1267 dso__set_loaded(self, map->type);
1270 return dso__load_kernel_sym(self, map, filter);
1272 name = malloc(size);
1276 self->adjust_symbols = 0;
1278 if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1279 ret = dso__load_perf_map(self, map, filter);
1280 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1281 DSO__ORIG_NOT_FOUND;
1285 self->origin = DSO__ORIG_BUILD_ID_CACHE;
1287 if (self->has_build_id) {
1288 build_id__sprintf(self->build_id, sizeof(self->build_id),
1290 snprintf(name, size, "%s/%s/.build-id/%.2s/%s",
1291 getenv("HOME"), DEBUG_CACHE_DIR,
1292 build_id_hex, build_id_hex + 2);
1298 switch (self->origin) {
1299 case DSO__ORIG_FEDORA:
1300 snprintf(name, size, "/usr/lib/debug%s.debug",
1303 case DSO__ORIG_UBUNTU:
1304 snprintf(name, size, "/usr/lib/debug%s",
1307 case DSO__ORIG_BUILDID:
1308 if (filename__read_build_id(self->long_name, build_id,
1309 sizeof(build_id))) {
1310 build_id__sprintf(build_id, sizeof(build_id),
1312 snprintf(name, size,
1313 "/usr/lib/debug/.build-id/%.2s/%s.debug",
1314 build_id_hex, build_id_hex + 2);
1315 if (self->has_build_id)
1316 goto compare_build_id;
1322 snprintf(name, size, "%s", self->long_name);
1329 if (self->has_build_id) {
1330 if (filename__read_build_id(name, build_id,
1331 sizeof(build_id)) < 0)
1334 if (!dso__build_id_equal(self, build_id))
1338 fd = open(name, O_RDONLY);
1341 ret = dso__load_sym(self, map, name, fd, filter, 0);
1345 * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1351 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1357 if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1362 struct map *map_groups__find_by_name(struct map_groups *self,
1363 enum map_type type, const char *name)
1367 for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1368 struct map *map = rb_entry(nd, struct map, rb_node);
1370 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1377 static int dso__kernel_module_get_build_id(struct dso *self)
1379 char filename[PATH_MAX];
1381 * kernel module short names are of the form "[module]" and
1382 * we need just "module" here.
1384 const char *name = self->short_name + 1;
1386 snprintf(filename, sizeof(filename),
1387 "/sys/module/%.*s/notes/.note.gnu.build-id",
1388 (int)strlen(name - 1), name);
1390 if (sysfs__read_build_id(filename, self->build_id,
1391 sizeof(self->build_id)) == 0)
1392 self->has_build_id = true;
1397 static int map_groups__set_modules_path_dir(struct map_groups *self, char *dirname)
1399 struct dirent *dent;
1400 DIR *dir = opendir(dirname);
1403 pr_debug("%s: cannot open %s dir\n", __func__, dirname);
1407 while ((dent = readdir(dir)) != NULL) {
1408 char path[PATH_MAX];
1410 if (dent->d_type == DT_DIR) {
1411 if (!strcmp(dent->d_name, ".") ||
1412 !strcmp(dent->d_name, ".."))
1415 snprintf(path, sizeof(path), "%s/%s",
1416 dirname, dent->d_name);
1417 if (map_groups__set_modules_path_dir(self, path) < 0)
1420 char *dot = strrchr(dent->d_name, '.'),
1425 if (dot == NULL || strcmp(dot, ".ko"))
1427 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1428 (int)(dot - dent->d_name), dent->d_name);
1430 strxfrchar(dso_name, '-', '_');
1431 map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1435 snprintf(path, sizeof(path), "%s/%s",
1436 dirname, dent->d_name);
1438 long_name = strdup(path);
1439 if (long_name == NULL)
1441 dso__set_long_name(map->dso, long_name);
1442 dso__kernel_module_get_build_id(map->dso);
1452 static int map_groups__set_modules_path(struct map_groups *self)
1455 char modules_path[PATH_MAX];
1457 if (uname(&uts) < 0)
1460 snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1463 return map_groups__set_modules_path_dir(self, modules_path);
1467 * Constructor variant for modules (where we know from /proc/modules where
1468 * they are loaded) and for vmlinux, where only after we load all the
1469 * symbols we'll know where it starts and ends.
1471 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1473 struct map *self = zalloc(sizeof(*self) +
1474 (dso->kernel ? sizeof(struct kmap) : 0));
1477 * ->end will be filled after we load all the symbols
1479 map__init(self, type, start, 0, 0, dso);
1485 struct map *map_groups__new_module(struct map_groups *self, u64 start,
1486 const char *filename)
1489 struct dso *dso = __dsos__findnew(&dsos__kernel, filename);
1494 map = map__new2(start, dso, MAP__FUNCTION);
1498 dso->origin = DSO__ORIG_KMODULE;
1499 map_groups__insert(self, map);
1503 static int map_groups__create_modules(struct map_groups *self)
1507 FILE *file = fopen("/proc/modules", "r");
1513 while (!feof(file)) {
1514 char name[PATH_MAX];
1519 line_len = getline(&line, &n, file);
1526 line[--line_len] = '\0'; /* \n */
1528 sep = strrchr(line, 'x');
1532 hex2u64(sep + 1, &start);
1534 sep = strchr(line, ' ');
1540 snprintf(name, sizeof(name), "[%s]", line);
1541 map = map_groups__new_module(self, start, name);
1543 goto out_delete_line;
1544 dso__kernel_module_get_build_id(map->dso);
1550 return map_groups__set_modules_path(self);
1558 static int dso__load_vmlinux(struct dso *self, struct map *map,
1559 const char *vmlinux, symbol_filter_t filter)
1563 if (self->has_build_id) {
1564 u8 build_id[BUILD_ID_SIZE];
1566 if (filename__read_build_id(vmlinux, build_id,
1567 sizeof(build_id)) < 0) {
1568 pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1571 if (!dso__build_id_equal(self, build_id)) {
1572 char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1573 vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1575 build_id__sprintf(self->build_id,
1576 sizeof(self->build_id),
1578 build_id__sprintf(build_id, sizeof(build_id),
1580 pr_debug("build_id in %s is %s while expected is %s, "
1581 "ignoring it\n", vmlinux, vmlinux_build_id,
1587 fd = open(vmlinux, O_RDONLY);
1591 dso__set_loaded(self, map->type);
1592 err = dso__load_sym(self, map, vmlinux, fd, filter, 0);
1596 pr_debug("Using %s for symbols\n", vmlinux);
1601 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1602 symbol_filter_t filter)
1606 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1607 vmlinux_path__nr_entries);
1609 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1610 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1612 dso__set_long_name(self, strdup(vmlinux_path[i]));
1620 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1621 symbol_filter_t filter)
1624 const char *kallsyms_filename = NULL;
1625 char *kallsyms_allocated_filename = NULL;
1627 * Step 1: if the user specified a vmlinux filename, use it and only
1628 * it, reporting errors to the user if it cannot be used.
1630 * For instance, try to analyse an ARM perf.data file _without_ a
1631 * build-id, or if the user specifies the wrong path to the right
1632 * vmlinux file, obviously we can't fallback to another vmlinux (a
1633 * x86_86 one, on the machine where analysis is being performed, say),
1634 * or worse, /proc/kallsyms.
1636 * If the specified file _has_ a build-id and there is a build-id
1637 * section in the perf.data file, we will still do the expected
1638 * validation in dso__load_vmlinux and will bail out if they don't
1641 if (symbol_conf.vmlinux_name != NULL) {
1642 err = dso__load_vmlinux(self, map,
1643 symbol_conf.vmlinux_name, filter);
1647 if (vmlinux_path != NULL) {
1648 err = dso__load_vmlinux_path(self, map, filter);
1654 * Say the kernel DSO was created when processing the build-id header table,
1655 * we have a build-id, so check if it is the same as the running kernel,
1656 * using it if it is.
1658 if (self->has_build_id) {
1659 u8 kallsyms_build_id[BUILD_ID_SIZE];
1660 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1662 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1663 sizeof(kallsyms_build_id)) == 0) {
1664 if (dso__build_id_equal(self, kallsyms_build_id)) {
1665 kallsyms_filename = "/proc/kallsyms";
1670 * Now look if we have it on the build-id cache in
1671 * $HOME/.debug/[kernel.kallsyms].
1673 build_id__sprintf(self->build_id, sizeof(self->build_id),
1676 if (asprintf(&kallsyms_allocated_filename,
1677 "%s/.debug/[kernel.kallsyms]/%s",
1678 getenv("HOME"), sbuild_id) == -1) {
1679 pr_err("Not enough memory for kallsyms file lookup\n");
1683 kallsyms_filename = kallsyms_allocated_filename;
1685 if (access(kallsyms_filename, F_OK)) {
1686 pr_err("No kallsyms or vmlinux with build-id %s "
1687 "was found\n", sbuild_id);
1688 free(kallsyms_allocated_filename);
1693 * Last resort, if we don't have a build-id and couldn't find
1694 * any vmlinux file, try the running kernel kallsyms table.
1696 kallsyms_filename = "/proc/kallsyms";
1700 err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1702 pr_debug("Using %s for symbols\n", kallsyms_filename);
1703 free(kallsyms_allocated_filename);
1708 if (kallsyms_filename != NULL)
1709 dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1710 map__fixup_start(map);
1711 map__fixup_end(map);
1717 LIST_HEAD(dsos__user);
1718 LIST_HEAD(dsos__kernel);
1720 static void dsos__add(struct list_head *head, struct dso *dso)
1722 list_add_tail(&dso->node, head);
1725 static struct dso *dsos__find(struct list_head *head, const char *name)
1729 list_for_each_entry(pos, head, node)
1730 if (strcmp(pos->long_name, name) == 0)
1735 struct dso *__dsos__findnew(struct list_head *head, const char *name)
1737 struct dso *dso = dsos__find(head, name);
1740 dso = dso__new(name);
1742 dsos__add(head, dso);
1743 dso__set_basename(dso);
1750 static void __dsos__fprintf(struct list_head *head, FILE *fp)
1754 list_for_each_entry(pos, head, node) {
1756 for (i = 0; i < MAP__NR_TYPES; ++i)
1757 dso__fprintf(pos, i, fp);
1761 void dsos__fprintf(FILE *fp)
1763 __dsos__fprintf(&dsos__kernel, fp);
1764 __dsos__fprintf(&dsos__user, fp);
1767 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
1773 list_for_each_entry(pos, head, node) {
1774 if (with_hits && !pos->hit)
1776 ret += dso__fprintf_buildid(pos, fp);
1777 ret += fprintf(fp, " %s\n", pos->long_name);
1782 size_t dsos__fprintf_buildid(FILE *fp, bool with_hits)
1784 return (__dsos__fprintf_buildid(&dsos__kernel, fp, with_hits) +
1785 __dsos__fprintf_buildid(&dsos__user, fp, with_hits));
1788 struct dso *dso__new_kernel(const char *name)
1790 struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
1793 dso__set_short_name(self, "[kernel]");
1800 void dso__read_running_kernel_build_id(struct dso *self)
1802 if (sysfs__read_build_id("/sys/kernel/notes", self->build_id,
1803 sizeof(self->build_id)) == 0)
1804 self->has_build_id = true;
1807 static struct dso *dsos__create_kernel(const char *vmlinux)
1809 struct dso *kernel = dso__new_kernel(vmlinux);
1811 if (kernel != NULL) {
1812 dso__read_running_kernel_build_id(kernel);
1813 dsos__add(&dsos__kernel, kernel);
1819 int __map_groups__create_kernel_maps(struct map_groups *self,
1820 struct map *vmlinux_maps[MAP__NR_TYPES],
1825 for (type = 0; type < MAP__NR_TYPES; ++type) {
1828 vmlinux_maps[type] = map__new2(0, kernel, type);
1829 if (vmlinux_maps[type] == NULL)
1832 vmlinux_maps[type]->map_ip =
1833 vmlinux_maps[type]->unmap_ip = identity__map_ip;
1835 kmap = map__kmap(vmlinux_maps[type]);
1837 map_groups__insert(self, vmlinux_maps[type]);
1843 static void vmlinux_path__exit(void)
1845 while (--vmlinux_path__nr_entries >= 0) {
1846 free(vmlinux_path[vmlinux_path__nr_entries]);
1847 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1851 vmlinux_path = NULL;
1854 static int vmlinux_path__init(void)
1859 if (uname(&uts) < 0)
1862 vmlinux_path = malloc(sizeof(char *) * 5);
1863 if (vmlinux_path == NULL)
1866 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1867 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1869 ++vmlinux_path__nr_entries;
1870 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1871 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1873 ++vmlinux_path__nr_entries;
1874 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1875 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1876 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1878 ++vmlinux_path__nr_entries;
1879 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1880 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1881 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1883 ++vmlinux_path__nr_entries;
1884 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1886 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1887 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1889 ++vmlinux_path__nr_entries;
1894 vmlinux_path__exit();
1898 static int setup_list(struct strlist **list, const char *list_str,
1899 const char *list_name)
1901 if (list_str == NULL)
1904 *list = strlist__new(true, list_str);
1906 pr_err("problems parsing %s list\n", list_name);
1912 int symbol__init(void)
1914 elf_version(EV_CURRENT);
1915 if (symbol_conf.sort_by_name)
1916 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1917 sizeof(struct symbol));
1919 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
1922 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1923 pr_err("'.' is the only non valid --field-separator argument\n");
1927 if (setup_list(&symbol_conf.dso_list,
1928 symbol_conf.dso_list_str, "dso") < 0)
1931 if (setup_list(&symbol_conf.comm_list,
1932 symbol_conf.comm_list_str, "comm") < 0)
1933 goto out_free_dso_list;
1935 if (setup_list(&symbol_conf.sym_list,
1936 symbol_conf.sym_list_str, "symbol") < 0)
1937 goto out_free_comm_list;
1942 strlist__delete(symbol_conf.dso_list);
1944 strlist__delete(symbol_conf.comm_list);
1948 int map_groups__create_kernel_maps(struct map_groups *self,
1949 struct map *vmlinux_maps[MAP__NR_TYPES])
1951 struct dso *kernel = dsos__create_kernel(symbol_conf.vmlinux_name);
1956 if (__map_groups__create_kernel_maps(self, vmlinux_maps, kernel) < 0)
1959 if (symbol_conf.use_modules && map_groups__create_modules(self) < 0)
1960 pr_debug("Problems creating module maps, continuing anyway...\n");
1962 * Now that we have all the maps created, just set the ->end of them:
1964 map_groups__fixup_end(self);