14 #include <sys/utsname.h>
16 #ifndef NT_GNU_BUILD_ID
17 #define NT_GNU_BUILD_ID 3
31 static void dsos__add(struct list_head *head, struct dso *dso);
32 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
33 static void kernel_maps__insert(struct map *map);
34 struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr);
35 static int dso__load_kernel_sym(struct dso *self, struct map *map,
36 symbol_filter_t filter);
37 unsigned int symbol__priv_size;
38 static int vmlinux_path__nr_entries;
39 static char **vmlinux_path;
40 static struct map *kernel_map__functions;
42 static struct symbol_conf symbol_conf__defaults = {
44 .try_vmlinux_path = true,
47 static struct rb_root kernel_maps__functions;
49 bool dso__loaded(const struct dso *self, enum map_type type)
51 return self->loaded & (1 << type);
54 static void dso__set_loaded(struct dso *self, enum map_type type)
56 self->loaded |= (1 << type);
59 static void symbols__fixup_end(struct rb_root *self)
61 struct rb_node *nd, *prevnd = rb_first(self);
62 struct symbol *curr, *prev;
67 curr = rb_entry(prevnd, struct symbol, rb_node);
69 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
71 curr = rb_entry(nd, struct symbol, rb_node);
73 if (prev->end == prev->start)
74 prev->end = curr->start - 1;
78 if (curr->end == curr->start)
79 curr->end = roundup(curr->start, 4096);
82 static void kernel_maps__fixup_end(void)
84 struct map *prev, *curr;
85 struct rb_node *nd, *prevnd = rb_first(&kernel_maps__functions);
90 curr = rb_entry(prevnd, struct map, rb_node);
92 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
94 curr = rb_entry(nd, struct map, rb_node);
95 prev->end = curr->start - 1;
99 * We still haven't the actual symbols, so guess the
100 * last map final address.
105 static struct symbol *symbol__new(u64 start, u64 len, const char *name)
107 size_t namelen = strlen(name) + 1;
108 struct symbol *self = zalloc(symbol__priv_size +
109 sizeof(*self) + namelen);
113 if (symbol__priv_size)
114 self = ((void *)self) + symbol__priv_size;
117 self->end = len ? start + len - 1 : start;
119 pr_debug3("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
121 memcpy(self->name, name, namelen);
126 static void symbol__delete(struct symbol *self)
128 free(((void *)self) - symbol__priv_size);
131 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
133 return fprintf(fp, " %llx-%llx %s\n",
134 self->start, self->end, self->name);
137 static void dso__set_long_name(struct dso *self, char *name)
141 self->long_name = name;
142 self->long_name_len = strlen(name);
145 static void dso__set_basename(struct dso *self)
147 self->short_name = basename(self->long_name);
150 struct dso *dso__new(const char *name)
152 struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
156 strcpy(self->name, name);
157 dso__set_long_name(self, self->name);
158 self->short_name = self->name;
159 for (i = 0; i < MAP__NR_TYPES; ++i)
160 self->symbols[i] = RB_ROOT;
161 self->find_symbol = dso__find_symbol;
162 self->slen_calculated = 0;
163 self->origin = DSO__ORIG_NOT_FOUND;
165 self->has_build_id = 0;
171 static void symbols__delete(struct rb_root *self)
174 struct rb_node *next = rb_first(self);
177 pos = rb_entry(next, struct symbol, rb_node);
178 next = rb_next(&pos->rb_node);
179 rb_erase(&pos->rb_node, self);
184 void dso__delete(struct dso *self)
187 for (i = 0; i < MAP__NR_TYPES; ++i)
188 symbols__delete(&self->symbols[i]);
189 if (self->long_name != self->name)
190 free(self->long_name);
194 void dso__set_build_id(struct dso *self, void *build_id)
196 memcpy(self->build_id, build_id, sizeof(self->build_id));
197 self->has_build_id = 1;
200 static void symbols__insert(struct rb_root *self, struct symbol *sym)
202 struct rb_node **p = &self->rb_node;
203 struct rb_node *parent = NULL;
204 const u64 ip = sym->start;
209 s = rb_entry(parent, struct symbol, rb_node);
215 rb_link_node(&sym->rb_node, parent, p);
216 rb_insert_color(&sym->rb_node, self);
219 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
229 struct symbol *s = rb_entry(n, struct symbol, rb_node);
233 else if (ip > s->end)
242 struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr)
244 return symbols__find(&self->symbols[type], addr);
247 int build_id__sprintf(u8 *self, int len, char *bf)
253 for (i = 0; i < len; ++i) {
254 sprintf(bid, "%02x", *raw);
262 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
264 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
266 build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
267 return fprintf(fp, "%s", sbuild_id);
270 static const char * map_type__name[MAP__NR_TYPES] = {
271 [MAP__FUNCTION] = "Functions",
274 size_t dso__fprintf(struct dso *self, FILE *fp)
278 size_t ret = fprintf(fp, "dso: %s (", self->short_name);
280 ret += dso__fprintf_buildid(self, fp);
281 ret += fprintf(fp, ")\n");
282 for (i = 0; i < MAP__NR_TYPES; ++i) {
283 ret += fprintf(fp, "%s:\n", map_type__name[i]);
285 for (nd = rb_first(&self->symbols[i]); nd; nd = rb_next(nd)) {
286 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
287 ret += symbol__fprintf(pos, fp);
295 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
296 * so that we can in the next step set the symbol ->end address and then
297 * call kernel_maps__split_kallsyms.
299 static int kernel_maps__load_all_kallsyms(void)
303 FILE *file = fopen("/proc/kallsyms", "r");
308 while (!feof(file)) {
315 line_len = getline(&line, &n, file);
322 line[--line_len] = '\0'; /* \n */
324 len = hex2u64(line, &start);
327 if (len + 2 >= line_len)
330 symbol_type = toupper(line[len]);
332 * We're interested only in code ('T'ext)
334 if (symbol_type != 'T' && symbol_type != 'W')
337 symbol_name = line + len + 2;
339 * Will fix up the end later, when we have all symbols sorted.
341 sym = symbol__new(start, 0, symbol_name);
344 goto out_delete_line;
347 * We will pass the symbols to the filter later, in
348 * kernel_maps__split_kallsyms, when we have split the
351 symbols__insert(&kernel_map__functions->dso->symbols[MAP__FUNCTION], sym);
366 * Split the symbols into maps, making sure there are no overlaps, i.e. the
367 * kernel range is broken in several maps, named [kernel].N, as we don't have
368 * the original ELF section names vmlinux have.
370 static int kernel_maps__split_kallsyms(symbol_filter_t filter)
372 struct map *map = kernel_map__functions;
375 struct rb_node *next = rb_first(&kernel_map__functions->dso->symbols[map->type]);
376 int kernel_range = 0;
381 pos = rb_entry(next, struct symbol, rb_node);
382 next = rb_next(&pos->rb_node);
384 module = strchr(pos->name, '\t');
388 if (strcmp(map->dso->name, module)) {
389 map = kernel_maps__find_by_dso_name(module);
391 pr_err("/proc/{kallsyms,modules} "
397 * So that we look just like we get from .ko files,
398 * i.e. not prelinked, relative to map->start.
400 pos->start = map->map_ip(map, pos->start);
401 pos->end = map->map_ip(map, pos->end);
402 } else if (map != kernel_map__functions) {
403 char dso_name[PATH_MAX];
406 snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
409 dso = dso__new(dso_name);
413 map = map__new2(pos->start, dso, MAP__FUNCTION);
419 map->map_ip = map->unmap_ip = identity__map_ip;
420 kernel_maps__insert(map);
424 if (filter && filter(map, pos)) {
425 rb_erase(&pos->rb_node, &kernel_map__functions->dso->symbols[map->type]);
428 if (map != kernel_map__functions) {
429 rb_erase(&pos->rb_node,
430 &kernel_map__functions->dso->symbols[map->type]);
431 symbols__insert(&map->dso->symbols[map->type], pos);
441 static int kernel_maps__load_kallsyms(symbol_filter_t filter)
443 if (kernel_maps__load_all_kallsyms())
446 symbols__fixup_end(&kernel_map__functions->dso->symbols[MAP__FUNCTION]);
447 kernel_map__functions->dso->origin = DSO__ORIG_KERNEL;
449 return kernel_maps__split_kallsyms(filter);
452 size_t kernel_maps__fprintf(FILE *fp)
454 size_t printed = fprintf(fp, "Kernel maps:\n");
457 for (nd = rb_first(&kernel_maps__functions); nd; nd = rb_next(nd)) {
458 struct map *pos = rb_entry(nd, struct map, rb_node);
460 printed += fprintf(fp, "Map:");
461 printed += map__fprintf(pos, fp);
463 printed += dso__fprintf(pos->dso, fp);
464 printed += fprintf(fp, "--\n");
468 return printed + fprintf(fp, "END kernel maps\n");
471 static int dso__load_perf_map(struct dso *self, struct map *map,
472 symbol_filter_t filter)
479 file = fopen(self->long_name, "r");
483 while (!feof(file)) {
488 line_len = getline(&line, &n, file);
495 line[--line_len] = '\0'; /* \n */
497 len = hex2u64(line, &start);
500 if (len + 2 >= line_len)
503 len += hex2u64(line + len, &size);
506 if (len + 2 >= line_len)
509 sym = symbol__new(start, size, line + len);
512 goto out_delete_line;
514 if (filter && filter(map, sym))
517 symbols__insert(&self->symbols[map->type], sym);
534 * elf_symtab__for_each_symbol - iterate thru all the symbols
536 * @self: struct elf_symtab instance to iterate
538 * @sym: GElf_Sym iterator
540 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
541 for (idx = 0, gelf_getsym(syms, idx, &sym);\
543 idx++, gelf_getsym(syms, idx, &sym))
545 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
547 return GELF_ST_TYPE(sym->st_info);
550 static inline int elf_sym__is_function(const GElf_Sym *sym)
552 return elf_sym__type(sym) == STT_FUNC &&
554 sym->st_shndx != SHN_UNDEF;
557 static inline int elf_sym__is_label(const GElf_Sym *sym)
559 return elf_sym__type(sym) == STT_NOTYPE &&
561 sym->st_shndx != SHN_UNDEF &&
562 sym->st_shndx != SHN_ABS;
565 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
566 const Elf_Data *secstrs)
568 return secstrs->d_buf + shdr->sh_name;
571 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
572 const Elf_Data *secstrs)
574 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
577 static inline const char *elf_sym__name(const GElf_Sym *sym,
578 const Elf_Data *symstrs)
580 return symstrs->d_buf + sym->st_name;
583 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
584 GElf_Shdr *shp, const char *name,
590 while ((sec = elf_nextscn(elf, sec)) != NULL) {
593 gelf_getshdr(sec, shp);
594 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
595 if (!strcmp(name, str)) {
606 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
607 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
609 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
611 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
612 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
614 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
617 * We need to check if we have a .dynsym, so that we can handle the
618 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
619 * .dynsym or .symtab).
620 * And always look at the original dso, not at debuginfo packages, that
621 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
623 static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
624 symbol_filter_t filter)
626 uint32_t nr_rel_entries, idx;
631 GElf_Shdr shdr_rel_plt, shdr_dynsym;
632 Elf_Data *reldata, *syms, *symstrs;
633 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
636 char sympltname[1024];
638 int nr = 0, symidx, fd, err = 0;
640 fd = open(self->long_name, O_RDONLY);
644 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
648 if (gelf_getehdr(elf, &ehdr) == NULL)
651 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
652 ".dynsym", &dynsym_idx);
653 if (scn_dynsym == NULL)
656 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
658 if (scn_plt_rel == NULL) {
659 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
661 if (scn_plt_rel == NULL)
667 if (shdr_rel_plt.sh_link != dynsym_idx)
670 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
674 * Fetch the relocation section to find the idxes to the GOT
675 * and the symbols in the .dynsym they refer to.
677 reldata = elf_getdata(scn_plt_rel, NULL);
681 syms = elf_getdata(scn_dynsym, NULL);
685 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
686 if (scn_symstrs == NULL)
689 symstrs = elf_getdata(scn_symstrs, NULL);
693 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
694 plt_offset = shdr_plt.sh_offset;
696 if (shdr_rel_plt.sh_type == SHT_RELA) {
697 GElf_Rela pos_mem, *pos;
699 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
701 symidx = GELF_R_SYM(pos->r_info);
702 plt_offset += shdr_plt.sh_entsize;
703 gelf_getsym(syms, symidx, &sym);
704 snprintf(sympltname, sizeof(sympltname),
705 "%s@plt", elf_sym__name(&sym, symstrs));
707 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
712 if (filter && filter(map, f))
715 symbols__insert(&self->symbols[map->type], f);
719 } else if (shdr_rel_plt.sh_type == SHT_REL) {
720 GElf_Rel pos_mem, *pos;
721 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
723 symidx = GELF_R_SYM(pos->r_info);
724 plt_offset += shdr_plt.sh_entsize;
725 gelf_getsym(syms, symidx, &sym);
726 snprintf(sympltname, sizeof(sympltname),
727 "%s@plt", elf_sym__name(&sym, symstrs));
729 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
734 if (filter && filter(map, f))
737 symbols__insert(&self->symbols[map->type], f);
752 pr_warning("%s: problems reading %s PLT info.\n",
753 __func__, self->long_name);
757 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
758 int fd, symbol_filter_t filter, int kernel,
761 struct map *curr_map = map;
762 struct dso *curr_dso = self;
763 size_t dso_name_len = strlen(self->short_name);
764 Elf_Data *symstrs, *secstrs;
772 Elf_Scn *sec, *sec_strndx;
776 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
778 pr_err("%s: cannot read %s ELF file.\n", __func__, name);
782 if (gelf_getehdr(elf, &ehdr) == NULL) {
783 pr_err("%s: cannot get elf header.\n", __func__);
787 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
789 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
794 syms = elf_getdata(sec, NULL);
798 sec = elf_getscn(elf, shdr.sh_link);
802 symstrs = elf_getdata(sec, NULL);
806 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
807 if (sec_strndx == NULL)
810 secstrs = elf_getdata(sec_strndx, NULL);
814 nr_syms = shdr.sh_size / shdr.sh_entsize;
816 memset(&sym, 0, sizeof(sym));
818 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
819 elf_section_by_name(elf, &ehdr, &shdr,
822 } else self->adjust_symbols = 0;
824 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
826 const char *elf_name;
827 char *demangled = NULL;
828 int is_label = elf_sym__is_label(&sym);
829 const char *section_name;
831 if (!is_label && !elf_sym__is_function(&sym))
834 sec = elf_getscn(elf, sym.st_shndx);
838 gelf_getshdr(sec, &shdr);
840 if (is_label && !elf_sec__is_text(&shdr, secstrs))
843 elf_name = elf_sym__name(&sym, symstrs);
844 section_name = elf_sec__name(&shdr, secstrs);
846 if (kernel || kmodule) {
847 char dso_name[PATH_MAX];
849 if (strcmp(section_name,
850 curr_dso->short_name + dso_name_len) == 0)
853 if (strcmp(section_name, ".text") == 0) {
859 snprintf(dso_name, sizeof(dso_name),
860 "%s%s", self->short_name, section_name);
862 curr_map = kernel_maps__find_by_dso_name(dso_name);
863 if (curr_map == NULL) {
864 u64 start = sym.st_value;
867 start += map->start + shdr.sh_offset;
869 curr_dso = dso__new(dso_name);
870 if (curr_dso == NULL)
872 curr_map = map__new2(start, curr_dso,
874 if (curr_map == NULL) {
875 dso__delete(curr_dso);
878 curr_map->map_ip = identity__map_ip;
879 curr_map->unmap_ip = identity__map_ip;
880 curr_dso->origin = DSO__ORIG_KERNEL;
881 kernel_maps__insert(curr_map);
882 dsos__add(&dsos__kernel, curr_dso);
884 curr_dso = curr_map->dso;
889 if (curr_dso->adjust_symbols) {
890 pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
891 "%Lx sh_offset: %Lx\n", (u64)sym.st_value,
892 (u64)shdr.sh_addr, (u64)shdr.sh_offset);
893 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
896 * We need to figure out if the object was created from C++ sources
897 * DWARF DW_compile_unit has this, but we don't always have access
900 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
901 if (demangled != NULL)
902 elf_name = demangled;
904 f = symbol__new(sym.st_value, sym.st_size, elf_name);
909 if (filter && filter(curr_map, f))
912 symbols__insert(&curr_dso->symbols[curr_map->type], f);
918 * For misannotated, zeroed, ASM function sizes.
921 symbols__fixup_end(&self->symbols[map->type]);
929 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
931 return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
934 static bool __dsos__read_build_ids(struct list_head *head)
936 bool have_build_id = false;
939 list_for_each_entry(pos, head, node)
940 if (filename__read_build_id(pos->long_name, pos->build_id,
941 sizeof(pos->build_id)) > 0) {
942 have_build_id = true;
943 pos->has_build_id = true;
946 return have_build_id;
949 bool dsos__read_build_ids(void)
951 return __dsos__read_build_ids(&dsos__kernel) ||
952 __dsos__read_build_ids(&dsos__user);
956 * Align offset to 4 bytes as needed for note name and descriptor data.
958 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
960 int filename__read_build_id(const char *filename, void *bf, size_t size)
971 if (size < BUILD_ID_SIZE)
974 fd = open(filename, O_RDONLY);
978 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
980 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
988 if (gelf_getehdr(elf, &ehdr) == NULL) {
989 pr_err("%s: cannot get elf header.\n", __func__);
993 sec = elf_section_by_name(elf, &ehdr, &shdr,
994 ".note.gnu.build-id", NULL);
996 sec = elf_section_by_name(elf, &ehdr, &shdr,
1002 data = elf_getdata(sec, NULL);
1007 while (ptr < (data->d_buf + data->d_size)) {
1008 GElf_Nhdr *nhdr = ptr;
1009 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1010 descsz = NOTE_ALIGN(nhdr->n_descsz);
1013 ptr += sizeof(*nhdr);
1016 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1017 nhdr->n_namesz == sizeof("GNU")) {
1018 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1019 memcpy(bf, ptr, BUILD_ID_SIZE);
1020 err = BUILD_ID_SIZE;
1034 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1038 if (size < BUILD_ID_SIZE)
1041 fd = open(filename, O_RDONLY);
1050 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1053 namesz = NOTE_ALIGN(nhdr.n_namesz);
1054 descsz = NOTE_ALIGN(nhdr.n_descsz);
1055 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1056 nhdr.n_namesz == sizeof("GNU")) {
1057 if (read(fd, bf, namesz) != namesz)
1059 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1060 if (read(fd, build_id,
1061 BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1065 } else if (read(fd, bf, descsz) != descsz)
1068 int n = namesz + descsz;
1069 if (read(fd, bf, n) != n)
1078 char dso__symtab_origin(const struct dso *self)
1080 static const char origin[] = {
1081 [DSO__ORIG_KERNEL] = 'k',
1082 [DSO__ORIG_JAVA_JIT] = 'j',
1083 [DSO__ORIG_FEDORA] = 'f',
1084 [DSO__ORIG_UBUNTU] = 'u',
1085 [DSO__ORIG_BUILDID] = 'b',
1086 [DSO__ORIG_DSO] = 'd',
1087 [DSO__ORIG_KMODULE] = 'K',
1090 if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1092 return origin[self->origin];
1095 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1097 int size = PATH_MAX;
1099 u8 build_id[BUILD_ID_SIZE];
1103 dso__set_loaded(self, map->type);
1106 return dso__load_kernel_sym(self, map, filter);
1108 name = malloc(size);
1112 self->adjust_symbols = 0;
1114 if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1115 ret = dso__load_perf_map(self, map, filter);
1116 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1117 DSO__ORIG_NOT_FOUND;
1121 self->origin = DSO__ORIG_FEDORA - 1;
1126 switch (self->origin) {
1127 case DSO__ORIG_FEDORA:
1128 snprintf(name, size, "/usr/lib/debug%s.debug",
1131 case DSO__ORIG_UBUNTU:
1132 snprintf(name, size, "/usr/lib/debug%s",
1135 case DSO__ORIG_BUILDID:
1136 if (filename__read_build_id(self->long_name, build_id,
1137 sizeof(build_id))) {
1138 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1140 build_id__sprintf(build_id, sizeof(build_id),
1142 snprintf(name, size,
1143 "/usr/lib/debug/.build-id/%.2s/%s.debug",
1144 build_id_hex, build_id_hex + 2);
1145 if (self->has_build_id)
1146 goto compare_build_id;
1152 snprintf(name, size, "%s", self->long_name);
1159 if (self->has_build_id) {
1160 if (filename__read_build_id(name, build_id,
1161 sizeof(build_id)) < 0)
1164 if (!dso__build_id_equal(self, build_id))
1168 fd = open(name, O_RDONLY);
1171 ret = dso__load_sym(self, map, name, fd, filter, 0, 0);
1175 * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
1181 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1187 if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1192 static void kernel_maps__insert(struct map *map)
1194 maps__insert(&kernel_maps__functions, map);
1197 struct symbol *kernel_maps__find_function(u64 ip, struct map **mapp,
1198 symbol_filter_t filter)
1200 struct map *map = maps__find(&kernel_maps__functions, ip);
1206 ip = map->map_ip(map, ip);
1207 return map__find_symbol(map, ip, filter);
1209 WARN_ONCE(RB_EMPTY_ROOT(&kernel_maps__functions),
1210 "Empty kernel_maps, was symbol__init() called?\n");
1215 struct map *kernel_maps__find_by_dso_name(const char *name)
1219 for (nd = rb_first(&kernel_maps__functions); nd; nd = rb_next(nd)) {
1220 struct map *map = rb_entry(nd, struct map, rb_node);
1222 if (map->dso && strcmp(map->dso->name, name) == 0)
1229 static int dsos__set_modules_path_dir(char *dirname)
1231 struct dirent *dent;
1232 DIR *dir = opendir(dirname);
1235 pr_debug("%s: cannot open %s dir\n", __func__, dirname);
1239 while ((dent = readdir(dir)) != NULL) {
1240 char path[PATH_MAX];
1242 if (dent->d_type == DT_DIR) {
1243 if (!strcmp(dent->d_name, ".") ||
1244 !strcmp(dent->d_name, ".."))
1247 snprintf(path, sizeof(path), "%s/%s",
1248 dirname, dent->d_name);
1249 if (dsos__set_modules_path_dir(path) < 0)
1252 char *dot = strrchr(dent->d_name, '.'),
1257 if (dot == NULL || strcmp(dot, ".ko"))
1259 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1260 (int)(dot - dent->d_name), dent->d_name);
1262 strxfrchar(dso_name, '-', '_');
1263 map = kernel_maps__find_by_dso_name(dso_name);
1267 snprintf(path, sizeof(path), "%s/%s",
1268 dirname, dent->d_name);
1270 long_name = strdup(path);
1271 if (long_name == NULL)
1273 dso__set_long_name(map->dso, long_name);
1283 static int dsos__set_modules_path(void)
1286 char modules_path[PATH_MAX];
1288 if (uname(&uts) < 0)
1291 snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
1294 return dsos__set_modules_path_dir(modules_path);
1298 * Constructor variant for modules (where we know from /proc/modules where
1299 * they are loaded) and for vmlinux, where only after we load all the
1300 * symbols we'll know where it starts and ends.
1302 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1304 struct map *self = malloc(sizeof(*self));
1308 * ->end will be filled after we load all the symbols
1310 map__init(self, type, start, 0, 0, dso);
1316 static int kernel_maps__create_module_maps(void)
1320 FILE *file = fopen("/proc/modules", "r");
1326 while (!feof(file)) {
1327 char name[PATH_MAX];
1333 line_len = getline(&line, &n, file);
1340 line[--line_len] = '\0'; /* \n */
1342 sep = strrchr(line, 'x');
1346 hex2u64(sep + 1, &start);
1348 sep = strchr(line, ' ');
1354 snprintf(name, sizeof(name), "[%s]", line);
1355 dso = dso__new(name);
1358 goto out_delete_line;
1360 map = map__new2(start, dso, MAP__FUNCTION);
1363 goto out_delete_line;
1366 snprintf(name, sizeof(name),
1367 "/sys/module/%s/notes/.note.gnu.build-id", line);
1368 if (sysfs__read_build_id(name, dso->build_id,
1369 sizeof(dso->build_id)) == 0)
1370 dso->has_build_id = true;
1372 dso->origin = DSO__ORIG_KMODULE;
1373 kernel_maps__insert(map);
1374 dsos__add(&dsos__kernel, dso);
1380 return dsos__set_modules_path();
1388 static int dso__load_vmlinux(struct dso *self, struct map *map,
1389 const char *vmlinux, symbol_filter_t filter)
1393 if (self->has_build_id) {
1394 u8 build_id[BUILD_ID_SIZE];
1396 if (filename__read_build_id(vmlinux, build_id,
1397 sizeof(build_id)) < 0) {
1398 pr_debug("No build_id in %s, ignoring it\n", vmlinux);
1401 if (!dso__build_id_equal(self, build_id)) {
1402 char expected_build_id[BUILD_ID_SIZE * 2 + 1],
1403 vmlinux_build_id[BUILD_ID_SIZE * 2 + 1];
1405 build_id__sprintf(self->build_id,
1406 sizeof(self->build_id),
1408 build_id__sprintf(build_id, sizeof(build_id),
1410 pr_debug("build_id in %s is %s while expected is %s, "
1411 "ignoring it\n", vmlinux, vmlinux_build_id,
1417 fd = open(vmlinux, O_RDONLY);
1421 dso__set_loaded(self, map->type);
1422 err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0);
1429 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1430 symbol_filter_t filter)
1435 if (vmlinux_path != NULL) {
1437 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1438 vmlinux_path__nr_entries);
1439 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1440 err = dso__load_vmlinux(self, map, vmlinux_path[i],
1443 pr_debug("Using %s for symbols\n",
1445 dso__set_long_name(self,
1446 strdup(vmlinux_path[i]));
1452 is_kallsyms = self->long_name[0] == '[';
1456 err = dso__load_vmlinux(self, map, self->long_name, filter);
1458 pr_info("The file %s cannot be used, "
1459 "trying to use /proc/kallsyms...", self->long_name);
1462 err = kernel_maps__load_kallsyms(filter);
1463 if (err > 0 && !is_kallsyms)
1464 dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1469 map__fixup_start(map);
1470 map__fixup_end(map);
1476 LIST_HEAD(dsos__user);
1477 LIST_HEAD(dsos__kernel);
1480 static void dsos__add(struct list_head *head, struct dso *dso)
1482 list_add_tail(&dso->node, head);
1485 static struct dso *dsos__find(struct list_head *head, const char *name)
1489 list_for_each_entry(pos, head, node)
1490 if (strcmp(pos->name, name) == 0)
1495 struct dso *dsos__findnew(const char *name)
1497 struct dso *dso = dsos__find(&dsos__user, name);
1500 dso = dso__new(name);
1502 dsos__add(&dsos__user, dso);
1503 dso__set_basename(dso);
1510 static void __dsos__fprintf(struct list_head *head, FILE *fp)
1514 list_for_each_entry(pos, head, node)
1515 dso__fprintf(pos, fp);
1518 void dsos__fprintf(FILE *fp)
1520 __dsos__fprintf(&dsos__kernel, fp);
1521 __dsos__fprintf(&dsos__user, fp);
1524 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp)
1529 list_for_each_entry(pos, head, node) {
1530 ret += dso__fprintf_buildid(pos, fp);
1531 ret += fprintf(fp, " %s\n", pos->long_name);
1536 size_t dsos__fprintf_buildid(FILE *fp)
1538 return (__dsos__fprintf_buildid(&dsos__kernel, fp) +
1539 __dsos__fprintf_buildid(&dsos__user, fp));
1542 static int kernel_maps__create_kernel_map(const struct symbol_conf *conf)
1544 struct dso *kernel = dso__new(conf->vmlinux_name ?: "[kernel.kallsyms]");
1549 kernel_map__functions = map__new2(0, kernel, MAP__FUNCTION);
1550 if (kernel_map__functions == NULL)
1551 goto out_delete_kernel_dso;
1553 kernel_map__functions->map_ip = kernel_map__functions->unmap_ip = identity__map_ip;
1554 kernel->short_name = "[kernel]";
1557 vdso = dso__new("[vdso]");
1559 goto out_delete_kernel_map;
1560 dso__set_loaded(vdso, MAP__FUNCTION);
1562 if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
1563 sizeof(kernel->build_id)) == 0)
1564 kernel->has_build_id = true;
1566 kernel_maps__insert(kernel_map__functions);
1567 dsos__add(&dsos__kernel, kernel);
1568 dsos__add(&dsos__user, vdso);
1572 out_delete_kernel_map:
1573 map__delete(kernel_map__functions);
1574 kernel_map__functions = NULL;
1575 out_delete_kernel_dso:
1576 dso__delete(kernel);
1580 static void vmlinux_path__exit(void)
1582 while (--vmlinux_path__nr_entries >= 0) {
1583 free(vmlinux_path[vmlinux_path__nr_entries]);
1584 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1588 vmlinux_path = NULL;
1591 static int vmlinux_path__init(void)
1596 if (uname(&uts) < 0)
1599 vmlinux_path = malloc(sizeof(char *) * 5);
1600 if (vmlinux_path == NULL)
1603 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1604 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1606 ++vmlinux_path__nr_entries;
1607 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1608 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1610 ++vmlinux_path__nr_entries;
1611 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1612 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1613 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1615 ++vmlinux_path__nr_entries;
1616 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1617 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1618 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1620 ++vmlinux_path__nr_entries;
1621 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1623 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1624 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1626 ++vmlinux_path__nr_entries;
1631 vmlinux_path__exit();
1635 static int kernel_maps__init(const struct symbol_conf *conf)
1637 const struct symbol_conf *pconf = conf ?: &symbol_conf__defaults;
1639 symbol__priv_size = pconf->priv_size;
1641 if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
1644 if (kernel_maps__create_kernel_map(pconf) < 0) {
1645 vmlinux_path__exit();
1649 if (pconf->use_modules && kernel_maps__create_module_maps() < 0)
1650 pr_debug("Failed to load list of modules in use, "
1653 * Now that we have all the maps created, just set the ->end of them:
1655 kernel_maps__fixup_end();
1659 int symbol__init(struct symbol_conf *conf)
1661 elf_version(EV_CURRENT);
1662 return kernel_maps__init(conf);