11 #include <sys/param.h>
23 #include <sys/utsname.h>
26 #define KSYM_NAME_LEN 128
29 #ifndef NT_GNU_BUILD_ID
30 #define NT_GNU_BUILD_ID 3
33 static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
34 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
35 static void dsos__add(struct list_head *head, struct dso *dso);
36 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
37 static int dso__load_kernel_sym(struct dso *self, struct map *map,
38 symbol_filter_t filter);
39 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
40 symbol_filter_t filter);
41 static int vmlinux_path__nr_entries;
42 static char **vmlinux_path;
44 struct symbol_conf symbol_conf = {
45 .exclude_other = true,
47 .try_vmlinux_path = true,
51 int dso__name_len(const struct dso *self)
54 return self->long_name_len;
56 return self->short_name_len;
59 bool dso__loaded(const struct dso *self, enum map_type type)
61 return self->loaded & (1 << type);
64 bool dso__sorted_by_name(const struct dso *self, enum map_type type)
66 return self->sorted_by_name & (1 << type);
69 static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
71 self->sorted_by_name |= (1 << type);
74 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
78 return symbol_type == 'T' || symbol_type == 'W';
80 return symbol_type == 'D' || symbol_type == 'd';
86 static void symbols__fixup_end(struct rb_root *self)
88 struct rb_node *nd, *prevnd = rb_first(self);
89 struct symbol *curr, *prev;
94 curr = rb_entry(prevnd, struct symbol, rb_node);
96 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
98 curr = rb_entry(nd, struct symbol, rb_node);
100 if (prev->end == prev->start && prev->end != curr->start)
101 prev->end = curr->start - 1;
105 if (curr->end == curr->start)
106 curr->end = roundup(curr->start, 4096);
109 static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
111 struct map *prev, *curr;
112 struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
117 curr = rb_entry(prevnd, struct map, rb_node);
119 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
121 curr = rb_entry(nd, struct map, rb_node);
122 prev->end = curr->start - 1;
126 * We still haven't the actual symbols, so guess the
127 * last map final address.
132 static void map_groups__fixup_end(struct map_groups *self)
135 for (i = 0; i < MAP__NR_TYPES; ++i)
136 __map_groups__fixup_end(self, i);
139 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
142 size_t namelen = strlen(name) + 1;
143 struct symbol *self = calloc(1, (symbol_conf.priv_size +
144 sizeof(*self) + namelen));
148 if (symbol_conf.priv_size)
149 self = ((void *)self) + symbol_conf.priv_size;
152 self->end = len ? start + len - 1 : start;
153 self->binding = binding;
154 self->namelen = namelen - 1;
156 pr_debug4("%s: %s %#Lx-%#Lx\n", __func__, name, start, self->end);
158 memcpy(self->name, name, namelen);
163 void symbol__delete(struct symbol *self)
165 free(((void *)self) - symbol_conf.priv_size);
168 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
170 return fprintf(fp, " %llx-%llx %c %s\n",
171 self->start, self->end,
172 self->binding == STB_GLOBAL ? 'g' :
173 self->binding == STB_LOCAL ? 'l' : 'w',
177 void dso__set_long_name(struct dso *self, char *name)
181 self->long_name = name;
182 self->long_name_len = strlen(name);
185 static void dso__set_short_name(struct dso *self, const char *name)
189 self->short_name = name;
190 self->short_name_len = strlen(name);
193 static void dso__set_basename(struct dso *self)
195 dso__set_short_name(self, basename(self->long_name));
198 struct dso *dso__new(const char *name)
200 struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
204 strcpy(self->name, name);
205 dso__set_long_name(self, self->name);
206 dso__set_short_name(self, self->name);
207 for (i = 0; i < MAP__NR_TYPES; ++i)
208 self->symbols[i] = self->symbol_names[i] = RB_ROOT;
209 self->slen_calculated = 0;
210 self->origin = DSO__ORIG_NOT_FOUND;
212 self->sorted_by_name = 0;
213 self->has_build_id = 0;
214 self->kernel = DSO_TYPE_USER;
215 INIT_LIST_HEAD(&self->node);
221 static void symbols__delete(struct rb_root *self)
224 struct rb_node *next = rb_first(self);
227 pos = rb_entry(next, struct symbol, rb_node);
228 next = rb_next(&pos->rb_node);
229 rb_erase(&pos->rb_node, self);
234 void dso__delete(struct dso *self)
237 for (i = 0; i < MAP__NR_TYPES; ++i)
238 symbols__delete(&self->symbols[i]);
239 if (self->sname_alloc)
240 free((char *)self->short_name);
241 if (self->lname_alloc)
242 free(self->long_name);
246 void dso__set_build_id(struct dso *self, void *build_id)
248 memcpy(self->build_id, build_id, sizeof(self->build_id));
249 self->has_build_id = 1;
252 static void symbols__insert(struct rb_root *self, struct symbol *sym)
254 struct rb_node **p = &self->rb_node;
255 struct rb_node *parent = NULL;
256 const u64 ip = sym->start;
261 s = rb_entry(parent, struct symbol, rb_node);
267 rb_link_node(&sym->rb_node, parent, p);
268 rb_insert_color(&sym->rb_node, self);
271 static struct symbol *symbols__find(struct rb_root *self, u64 ip)
281 struct symbol *s = rb_entry(n, struct symbol, rb_node);
285 else if (ip > s->end)
294 struct symbol_name_rb_node {
295 struct rb_node rb_node;
299 static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
301 struct rb_node **p = &self->rb_node;
302 struct rb_node *parent = NULL;
303 struct symbol_name_rb_node *symn, *s;
305 symn = container_of(sym, struct symbol_name_rb_node, sym);
309 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
310 if (strcmp(sym->name, s->sym.name) < 0)
315 rb_link_node(&symn->rb_node, parent, p);
316 rb_insert_color(&symn->rb_node, self);
319 static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
323 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
324 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
325 symbols__insert_by_name(self, pos);
329 static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
339 struct symbol_name_rb_node *s;
342 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
343 cmp = strcmp(name, s->sym.name);
356 struct symbol *dso__find_symbol(struct dso *self,
357 enum map_type type, u64 addr)
359 return symbols__find(&self->symbols[type], addr);
362 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
365 return symbols__find_by_name(&self->symbol_names[type], name);
368 void dso__sort_by_name(struct dso *self, enum map_type type)
370 dso__set_sorted_by_name(self, type);
371 return symbols__sort_by_name(&self->symbol_names[type],
372 &self->symbols[type]);
375 int build_id__sprintf(const u8 *self, int len, char *bf)
378 const u8 *raw = self;
381 for (i = 0; i < len; ++i) {
382 sprintf(bid, "%02x", *raw);
390 size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
392 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
394 build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
395 return fprintf(fp, "%s", sbuild_id);
398 size_t dso__fprintf_symbols_by_name(struct dso *self, enum map_type type, FILE *fp)
402 struct symbol_name_rb_node *pos;
404 for (nd = rb_first(&self->symbol_names[type]); nd; nd = rb_next(nd)) {
405 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
406 fprintf(fp, "%s\n", pos->sym.name);
412 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
415 size_t ret = fprintf(fp, "dso: %s (", self->short_name);
417 if (self->short_name != self->long_name)
418 ret += fprintf(fp, "%s, ", self->long_name);
419 ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
420 self->loaded ? "" : "NOT ");
421 ret += dso__fprintf_buildid(self, fp);
422 ret += fprintf(fp, ")\n");
423 for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
424 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
425 ret += symbol__fprintf(pos, fp);
431 int kallsyms__parse(const char *filename, void *arg,
432 int (*process_symbol)(void *arg, const char *name,
433 char type, u64 start, u64 end))
439 char prev_symbol_type = 0;
440 char *prev_symbol_name;
441 FILE *file = fopen(filename, "r");
446 prev_symbol_name = malloc(KSYM_NAME_LEN);
447 if (prev_symbol_name == NULL)
452 while (!feof(file)) {
458 line_len = getline(&line, &n, file);
459 if (line_len < 0 || !line)
462 line[--line_len] = '\0'; /* \n */
464 len = hex2u64(line, &start);
467 if (len + 2 >= line_len)
470 symbol_type = toupper(line[len]);
472 symbol_name = line + len;
473 len = line_len - len;
475 if (len >= KSYM_NAME_LEN) {
480 if (prev_symbol_type) {
482 if (end != prev_start)
484 err = process_symbol(arg, prev_symbol_name,
485 prev_symbol_type, prev_start, end);
490 memcpy(prev_symbol_name, symbol_name, len + 1);
491 prev_symbol_type = symbol_type;
495 free(prev_symbol_name);
505 struct process_kallsyms_args {
510 static u8 kallsyms2elf_type(char type)
515 return isupper(type) ? STB_GLOBAL : STB_LOCAL;
518 static int map__process_kallsym_symbol(void *arg, const char *name,
519 char type, u64 start, u64 end)
522 struct process_kallsyms_args *a = arg;
523 struct rb_root *root = &a->dso->symbols[a->map->type];
525 if (!symbol_type__is_a(type, a->map->type))
528 sym = symbol__new(start, end - start + 1,
529 kallsyms2elf_type(type), name);
533 * We will pass the symbols to the filter later, in
534 * map__split_kallsyms, when we have split the maps per module
536 symbols__insert(root, sym);
542 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
543 * so that we can in the next step set the symbol ->end address and then
544 * call kernel_maps__split_kallsyms.
546 static int dso__load_all_kallsyms(struct dso *self, const char *filename,
549 struct process_kallsyms_args args = { .map = map, .dso = self, };
550 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
554 * Split the symbols into maps, making sure there are no overlaps, i.e. the
555 * kernel range is broken in several maps, named [kernel].N, as we don't have
556 * the original ELF section names vmlinux have.
558 static int dso__split_kallsyms(struct dso *self, struct map *map,
559 symbol_filter_t filter)
561 struct map_groups *kmaps = map__kmap(map)->kmaps;
562 struct machine *machine = kmaps->machine;
563 struct map *curr_map = map;
565 int count = 0, moved = 0;
566 struct rb_root *root = &self->symbols[map->type];
567 struct rb_node *next = rb_first(root);
568 int kernel_range = 0;
573 pos = rb_entry(next, struct symbol, rb_node);
574 next = rb_next(&pos->rb_node);
576 module = strchr(pos->name, '\t');
578 if (!symbol_conf.use_modules)
583 if (strcmp(curr_map->dso->short_name, module)) {
584 if (curr_map != map &&
585 self->kernel == DSO_TYPE_GUEST_KERNEL &&
586 machine__is_default_guest(machine)) {
588 * We assume all symbols of a module are
589 * continuous in * kallsyms, so curr_map
590 * points to a module and all its
591 * symbols are in its kmap. Mark it as
594 dso__set_loaded(curr_map->dso,
598 curr_map = map_groups__find_by_name(kmaps,
600 if (curr_map == NULL) {
601 pr_debug("%s/proc/{kallsyms,modules} "
602 "inconsistency while looking "
603 "for \"%s\" module!\n",
604 machine->root_dir, module);
609 if (curr_map->dso->loaded &&
610 !machine__is_default_guest(machine))
614 * So that we look just like we get from .ko files,
615 * i.e. not prelinked, relative to map->start.
617 pos->start = curr_map->map_ip(curr_map, pos->start);
618 pos->end = curr_map->map_ip(curr_map, pos->end);
619 } else if (curr_map != map) {
620 char dso_name[PATH_MAX];
628 if (self->kernel == DSO_TYPE_GUEST_KERNEL)
629 snprintf(dso_name, sizeof(dso_name),
633 snprintf(dso_name, sizeof(dso_name),
637 dso = dso__new(dso_name);
641 dso->kernel = self->kernel;
643 curr_map = map__new2(pos->start, dso, map->type);
644 if (curr_map == NULL) {
649 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
650 map_groups__insert(kmaps, curr_map);
654 if (filter && filter(curr_map, pos)) {
655 discard_symbol: rb_erase(&pos->rb_node, root);
658 if (curr_map != map) {
659 rb_erase(&pos->rb_node, root);
660 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
667 if (curr_map != map &&
668 self->kernel == DSO_TYPE_GUEST_KERNEL &&
669 machine__is_default_guest(kmaps->machine)) {
670 dso__set_loaded(curr_map->dso, curr_map->type);
673 return count + moved;
676 int dso__load_kallsyms(struct dso *self, const char *filename,
677 struct map *map, symbol_filter_t filter)
679 if (dso__load_all_kallsyms(self, filename, map) < 0)
682 if (self->kernel == DSO_TYPE_GUEST_KERNEL)
683 self->origin = DSO__ORIG_GUEST_KERNEL;
685 self->origin = DSO__ORIG_KERNEL;
687 return dso__split_kallsyms(self, map, filter);
690 static int dso__load_perf_map(struct dso *self, struct map *map,
691 symbol_filter_t filter)
698 file = fopen(self->long_name, "r");
702 while (!feof(file)) {
707 line_len = getline(&line, &n, file);
714 line[--line_len] = '\0'; /* \n */
716 len = hex2u64(line, &start);
719 if (len + 2 >= line_len)
722 len += hex2u64(line + len, &size);
725 if (len + 2 >= line_len)
728 sym = symbol__new(start, size, STB_GLOBAL, line + len);
731 goto out_delete_line;
733 if (filter && filter(map, sym))
736 symbols__insert(&self->symbols[map->type], sym);
753 * elf_symtab__for_each_symbol - iterate thru all the symbols
755 * @self: struct elf_symtab instance to iterate
757 * @sym: GElf_Sym iterator
759 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
760 for (idx = 0, gelf_getsym(syms, idx, &sym);\
762 idx++, gelf_getsym(syms, idx, &sym))
764 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
766 return GELF_ST_TYPE(sym->st_info);
769 static inline int elf_sym__is_function(const GElf_Sym *sym)
771 return elf_sym__type(sym) == STT_FUNC &&
773 sym->st_shndx != SHN_UNDEF;
776 static inline bool elf_sym__is_object(const GElf_Sym *sym)
778 return elf_sym__type(sym) == STT_OBJECT &&
780 sym->st_shndx != SHN_UNDEF;
783 static inline int elf_sym__is_label(const GElf_Sym *sym)
785 return elf_sym__type(sym) == STT_NOTYPE &&
787 sym->st_shndx != SHN_UNDEF &&
788 sym->st_shndx != SHN_ABS;
791 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
792 const Elf_Data *secstrs)
794 return secstrs->d_buf + shdr->sh_name;
797 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
798 const Elf_Data *secstrs)
800 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
803 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
804 const Elf_Data *secstrs)
806 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
809 static inline const char *elf_sym__name(const GElf_Sym *sym,
810 const Elf_Data *symstrs)
812 return symstrs->d_buf + sym->st_name;
815 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
816 GElf_Shdr *shp, const char *name,
822 while ((sec = elf_nextscn(elf, sec)) != NULL) {
825 gelf_getshdr(sec, shp);
826 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
827 if (!strcmp(name, str)) {
838 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
839 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
841 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
843 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
844 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
846 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
849 * We need to check if we have a .dynsym, so that we can handle the
850 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
851 * .dynsym or .symtab).
852 * And always look at the original dso, not at debuginfo packages, that
853 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
855 static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
856 symbol_filter_t filter)
858 uint32_t nr_rel_entries, idx;
863 GElf_Shdr shdr_rel_plt, shdr_dynsym;
864 Elf_Data *reldata, *syms, *symstrs;
865 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
868 char sympltname[1024];
870 int nr = 0, symidx, fd, err = 0;
873 snprintf(name, sizeof(name), "%s%s",
874 symbol_conf.symfs, self->long_name);
875 fd = open(name, O_RDONLY);
879 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
883 if (gelf_getehdr(elf, &ehdr) == NULL)
886 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
887 ".dynsym", &dynsym_idx);
888 if (scn_dynsym == NULL)
891 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
893 if (scn_plt_rel == NULL) {
894 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
896 if (scn_plt_rel == NULL)
902 if (shdr_rel_plt.sh_link != dynsym_idx)
905 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
909 * Fetch the relocation section to find the idxes to the GOT
910 * and the symbols in the .dynsym they refer to.
912 reldata = elf_getdata(scn_plt_rel, NULL);
916 syms = elf_getdata(scn_dynsym, NULL);
920 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
921 if (scn_symstrs == NULL)
924 symstrs = elf_getdata(scn_symstrs, NULL);
928 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
929 plt_offset = shdr_plt.sh_offset;
931 if (shdr_rel_plt.sh_type == SHT_RELA) {
932 GElf_Rela pos_mem, *pos;
934 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
936 symidx = GELF_R_SYM(pos->r_info);
937 plt_offset += shdr_plt.sh_entsize;
938 gelf_getsym(syms, symidx, &sym);
939 snprintf(sympltname, sizeof(sympltname),
940 "%s@plt", elf_sym__name(&sym, symstrs));
942 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
943 STB_GLOBAL, sympltname);
947 if (filter && filter(map, f))
950 symbols__insert(&self->symbols[map->type], f);
954 } else if (shdr_rel_plt.sh_type == SHT_REL) {
955 GElf_Rel pos_mem, *pos;
956 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
958 symidx = GELF_R_SYM(pos->r_info);
959 plt_offset += shdr_plt.sh_entsize;
960 gelf_getsym(syms, symidx, &sym);
961 snprintf(sympltname, sizeof(sympltname),
962 "%s@plt", elf_sym__name(&sym, symstrs));
964 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
965 STB_GLOBAL, sympltname);
969 if (filter && filter(map, f))
972 symbols__insert(&self->symbols[map->type], f);
987 pr_debug("%s: problems reading %s PLT info.\n",
988 __func__, self->long_name);
992 static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
996 return elf_sym__is_function(self);
998 return elf_sym__is_object(self);
1004 static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
1008 return elf_sec__is_text(self, secstrs);
1010 return elf_sec__is_data(self, secstrs);
1016 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1018 Elf_Scn *sec = NULL;
1022 while ((sec = elf_nextscn(elf, sec)) != NULL) {
1023 gelf_getshdr(sec, &shdr);
1025 if ((addr >= shdr.sh_addr) &&
1026 (addr < (shdr.sh_addr + shdr.sh_size)))
1035 static int dso__load_sym(struct dso *self, struct map *map, const char *name,
1036 int fd, symbol_filter_t filter, int kmodule,
1039 struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
1040 struct map *curr_map = map;
1041 struct dso *curr_dso = self;
1042 Elf_Data *symstrs, *secstrs;
1047 GElf_Shdr shdr, opdshdr;
1048 Elf_Data *syms, *opddata = NULL;
1050 Elf_Scn *sec, *sec_strndx, *opdsec;
1055 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1057 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1061 if (gelf_getehdr(elf, &ehdr) == NULL) {
1062 pr_debug("%s: cannot get elf header.\n", __func__);
1066 /* Always reject images with a mismatched build-id: */
1067 if (self->has_build_id) {
1068 u8 build_id[BUILD_ID_SIZE];
1070 if (elf_read_build_id(elf, build_id,
1071 BUILD_ID_SIZE) != BUILD_ID_SIZE)
1074 if (!dso__build_id_equal(self, build_id))
1078 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1083 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1088 opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1090 opddata = elf_rawdata(opdsec, NULL);
1092 syms = elf_getdata(sec, NULL);
1096 sec = elf_getscn(elf, shdr.sh_link);
1100 symstrs = elf_getdata(sec, NULL);
1101 if (symstrs == NULL)
1104 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1105 if (sec_strndx == NULL)
1108 secstrs = elf_getdata(sec_strndx, NULL);
1109 if (secstrs == NULL)
1112 nr_syms = shdr.sh_size / shdr.sh_entsize;
1114 memset(&sym, 0, sizeof(sym));
1115 if (self->kernel == DSO_TYPE_USER) {
1116 self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1117 elf_section_by_name(elf, &ehdr, &shdr,
1118 ".gnu.prelink_undo",
1120 } else self->adjust_symbols = 0;
1122 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1124 const char *elf_name = elf_sym__name(&sym, symstrs);
1125 char *demangled = NULL;
1126 int is_label = elf_sym__is_label(&sym);
1127 const char *section_name;
1129 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1130 strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1131 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1133 if (!is_label && !elf_sym__is_a(&sym, map->type))
1136 /* Reject ARM ELF "mapping symbols": these aren't unique and
1137 * don't identify functions, so will confuse the profile
1139 if (ehdr.e_machine == EM_ARM) {
1140 if (!strcmp(elf_name, "$a") ||
1141 !strcmp(elf_name, "$d") ||
1142 !strcmp(elf_name, "$t"))
1146 if (opdsec && sym.st_shndx == opdidx) {
1147 u32 offset = sym.st_value - opdshdr.sh_addr;
1148 u64 *opd = opddata->d_buf + offset;
1149 sym.st_value = *opd;
1150 sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1153 sec = elf_getscn(elf, sym.st_shndx);
1157 gelf_getshdr(sec, &shdr);
1159 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1162 section_name = elf_sec__name(&shdr, secstrs);
1164 /* On ARM, symbols for thumb functions have 1 added to
1165 * the symbol address as a flag - remove it */
1166 if ((ehdr.e_machine == EM_ARM) &&
1167 (map->type == MAP__FUNCTION) &&
1171 if (self->kernel != DSO_TYPE_USER || kmodule) {
1172 char dso_name[PATH_MAX];
1174 if (strcmp(section_name,
1175 (curr_dso->short_name +
1176 self->short_name_len)) == 0)
1179 if (strcmp(section_name, ".text") == 0) {
1185 snprintf(dso_name, sizeof(dso_name),
1186 "%s%s", self->short_name, section_name);
1188 curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1189 if (curr_map == NULL) {
1190 u64 start = sym.st_value;
1193 start += map->start + shdr.sh_offset;
1195 curr_dso = dso__new(dso_name);
1196 if (curr_dso == NULL)
1198 curr_dso->kernel = self->kernel;
1199 curr_map = map__new2(start, curr_dso,
1201 if (curr_map == NULL) {
1202 dso__delete(curr_dso);
1205 curr_map->map_ip = identity__map_ip;
1206 curr_map->unmap_ip = identity__map_ip;
1207 curr_dso->origin = self->origin;
1208 map_groups__insert(kmap->kmaps, curr_map);
1209 dsos__add(&self->node, curr_dso);
1210 dso__set_loaded(curr_dso, map->type);
1212 curr_dso = curr_map->dso;
1217 if (curr_dso->adjust_symbols) {
1218 pr_debug4("%s: adjusting symbol: st_value: %#Lx "
1219 "sh_addr: %#Lx sh_offset: %#Lx\n", __func__,
1220 (u64)sym.st_value, (u64)shdr.sh_addr,
1221 (u64)shdr.sh_offset);
1222 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1225 * We need to figure out if the object was created from C++ sources
1226 * DWARF DW_compile_unit has this, but we don't always have access
1229 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1230 if (demangled != NULL)
1231 elf_name = demangled;
1233 f = symbol__new(sym.st_value, sym.st_size,
1234 GELF_ST_BIND(sym.st_info), elf_name);
1239 if (filter && filter(curr_map, f))
1242 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1248 * For misannotated, zeroed, ASM function sizes.
1251 symbols__fixup_end(&self->symbols[map->type]);
1254 * We need to fixup this here too because we create new
1255 * maps here, for things like vsyscall sections.
1257 __map_groups__fixup_end(kmap->kmaps, map->type);
1267 static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
1269 return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
1272 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1274 bool have_build_id = false;
1277 list_for_each_entry(pos, head, node) {
1278 if (with_hits && !pos->hit)
1280 if (pos->has_build_id) {
1281 have_build_id = true;
1284 if (filename__read_build_id(pos->long_name, pos->build_id,
1285 sizeof(pos->build_id)) > 0) {
1286 have_build_id = true;
1287 pos->has_build_id = true;
1291 return have_build_id;
1295 * Align offset to 4 bytes as needed for note name and descriptor data.
1297 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1299 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1309 if (size < BUILD_ID_SIZE)
1313 if (ek != ELF_K_ELF)
1316 if (gelf_getehdr(elf, &ehdr) == NULL) {
1317 pr_err("%s: cannot get elf header.\n", __func__);
1321 sec = elf_section_by_name(elf, &ehdr, &shdr,
1322 ".note.gnu.build-id", NULL);
1324 sec = elf_section_by_name(elf, &ehdr, &shdr,
1330 data = elf_getdata(sec, NULL);
1335 while (ptr < (data->d_buf + data->d_size)) {
1336 GElf_Nhdr *nhdr = ptr;
1337 int namesz = NOTE_ALIGN(nhdr->n_namesz),
1338 descsz = NOTE_ALIGN(nhdr->n_descsz);
1341 ptr += sizeof(*nhdr);
1344 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1345 nhdr->n_namesz == sizeof("GNU")) {
1346 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1347 memcpy(bf, ptr, BUILD_ID_SIZE);
1348 err = BUILD_ID_SIZE;
1359 int filename__read_build_id(const char *filename, void *bf, size_t size)
1364 if (size < BUILD_ID_SIZE)
1367 fd = open(filename, O_RDONLY);
1371 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1373 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1377 err = elf_read_build_id(elf, bf, size);
1386 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1390 if (size < BUILD_ID_SIZE)
1393 fd = open(filename, O_RDONLY);
1402 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1405 namesz = NOTE_ALIGN(nhdr.n_namesz);
1406 descsz = NOTE_ALIGN(nhdr.n_descsz);
1407 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1408 nhdr.n_namesz == sizeof("GNU")) {
1409 if (read(fd, bf, namesz) != namesz)
1411 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1412 if (read(fd, build_id,
1413 BUILD_ID_SIZE) == BUILD_ID_SIZE) {
1417 } else if (read(fd, bf, descsz) != descsz)
1420 int n = namesz + descsz;
1421 if (read(fd, bf, n) != n)
1430 char dso__symtab_origin(const struct dso *self)
1432 static const char origin[] = {
1433 [DSO__ORIG_KERNEL] = 'k',
1434 [DSO__ORIG_JAVA_JIT] = 'j',
1435 [DSO__ORIG_BUILD_ID_CACHE] = 'B',
1436 [DSO__ORIG_FEDORA] = 'f',
1437 [DSO__ORIG_UBUNTU] = 'u',
1438 [DSO__ORIG_BUILDID] = 'b',
1439 [DSO__ORIG_DSO] = 'd',
1440 [DSO__ORIG_KMODULE] = 'K',
1441 [DSO__ORIG_GUEST_KERNEL] = 'g',
1442 [DSO__ORIG_GUEST_KMODULE] = 'G',
1445 if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
1447 return origin[self->origin];
1450 int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
1452 int size = PATH_MAX;
1456 struct machine *machine;
1457 const char *root_dir;
1460 dso__set_loaded(self, map->type);
1462 if (self->kernel == DSO_TYPE_KERNEL)
1463 return dso__load_kernel_sym(self, map, filter);
1464 else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
1465 return dso__load_guest_kernel_sym(self, map, filter);
1467 if (map->groups && map->groups->machine)
1468 machine = map->groups->machine;
1472 name = malloc(size);
1476 self->adjust_symbols = 0;
1478 if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
1479 ret = dso__load_perf_map(self, map, filter);
1480 self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
1481 DSO__ORIG_NOT_FOUND;
1485 /* Iterate over candidate debug images.
1486 * On the first pass, only load images if they have a full symtab.
1487 * Failing that, do a second pass where we accept .dynsym also
1489 for (self->origin = DSO__ORIG_BUILD_ID_CACHE, want_symtab = 1;
1490 self->origin != DSO__ORIG_NOT_FOUND;
1492 switch (self->origin) {
1493 case DSO__ORIG_BUILD_ID_CACHE:
1494 /* skip the locally configured cache if a symfs is given */
1495 if (symbol_conf.symfs[0] ||
1496 (dso__build_id_filename(self, name, size) == NULL)) {
1500 case DSO__ORIG_FEDORA:
1501 snprintf(name, size, "%s/usr/lib/debug%s.debug",
1502 symbol_conf.symfs, self->long_name);
1504 case DSO__ORIG_UBUNTU:
1505 snprintf(name, size, "%s/usr/lib/debug%s",
1506 symbol_conf.symfs, self->long_name);
1508 case DSO__ORIG_BUILDID: {
1509 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1511 if (!self->has_build_id)
1514 build_id__sprintf(self->build_id,
1515 sizeof(self->build_id),
1517 snprintf(name, size,
1518 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1519 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1523 snprintf(name, size, "%s%s",
1524 symbol_conf.symfs, self->long_name);
1526 case DSO__ORIG_GUEST_KMODULE:
1527 if (map->groups && map->groups->machine)
1528 root_dir = map->groups->machine->root_dir;
1531 snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1532 root_dir, self->long_name);
1535 case DSO__ORIG_KMODULE:
1536 snprintf(name, size, "%s%s", symbol_conf.symfs,
1542 * If we wanted a full symtab but no image had one,
1543 * relax our requirements and repeat the search.
1547 self->origin = DSO__ORIG_BUILD_ID_CACHE;
1552 /* Name is now the name of the next image to try */
1553 fd = open(name, O_RDONLY);
1557 ret = dso__load_sym(self, map, name, fd, filter, 0,
1562 * Some people seem to have debuginfo files _WITHOUT_ debug
1569 int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
1577 if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
1582 struct map *map_groups__find_by_name(struct map_groups *self,
1583 enum map_type type, const char *name)
1587 for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
1588 struct map *map = rb_entry(nd, struct map, rb_node);
1590 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1597 static int dso__kernel_module_get_build_id(struct dso *self,
1598 const char *root_dir)
1600 char filename[PATH_MAX];
1602 * kernel module short names are of the form "[module]" and
1603 * we need just "module" here.
1605 const char *name = self->short_name + 1;
1607 snprintf(filename, sizeof(filename),
1608 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1609 root_dir, (int)strlen(name) - 1, name);
1611 if (sysfs__read_build_id(filename, self->build_id,
1612 sizeof(self->build_id)) == 0)
1613 self->has_build_id = true;
1618 static int map_groups__set_modules_path_dir(struct map_groups *self,
1619 const char *dir_name)
1621 struct dirent *dent;
1622 DIR *dir = opendir(dir_name);
1626 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1630 while ((dent = readdir(dir)) != NULL) {
1631 char path[PATH_MAX];
1634 /*sshfs might return bad dent->d_type, so we have to stat*/
1635 sprintf(path, "%s/%s", dir_name, dent->d_name);
1636 if (stat(path, &st))
1639 if (S_ISDIR(st.st_mode)) {
1640 if (!strcmp(dent->d_name, ".") ||
1641 !strcmp(dent->d_name, ".."))
1644 snprintf(path, sizeof(path), "%s/%s",
1645 dir_name, dent->d_name);
1646 ret = map_groups__set_modules_path_dir(self, path);
1650 char *dot = strrchr(dent->d_name, '.'),
1655 if (dot == NULL || strcmp(dot, ".ko"))
1657 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1658 (int)(dot - dent->d_name), dent->d_name);
1660 strxfrchar(dso_name, '-', '_');
1661 map = map_groups__find_by_name(self, MAP__FUNCTION, dso_name);
1665 snprintf(path, sizeof(path), "%s/%s",
1666 dir_name, dent->d_name);
1668 long_name = strdup(path);
1669 if (long_name == NULL) {
1673 dso__set_long_name(map->dso, long_name);
1674 map->dso->lname_alloc = 1;
1675 dso__kernel_module_get_build_id(map->dso, "");
1684 static char *get_kernel_version(const char *root_dir)
1686 char version[PATH_MAX];
1689 const char *prefix = "Linux version ";
1691 sprintf(version, "%s/proc/version", root_dir);
1692 file = fopen(version, "r");
1697 tmp = fgets(version, sizeof(version), file);
1700 name = strstr(version, prefix);
1703 name += strlen(prefix);
1704 tmp = strchr(name, ' ');
1708 return strdup(name);
1711 static int machine__set_modules_path(struct machine *self)
1714 char modules_path[PATH_MAX];
1716 version = get_kernel_version(self->root_dir);
1720 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1721 self->root_dir, version);
1724 return map_groups__set_modules_path_dir(&self->kmaps, modules_path);
1728 * Constructor variant for modules (where we know from /proc/modules where
1729 * they are loaded) and for vmlinux, where only after we load all the
1730 * symbols we'll know where it starts and ends.
1732 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1734 struct map *self = calloc(1, (sizeof(*self) +
1735 (dso->kernel ? sizeof(struct kmap) : 0)));
1738 * ->end will be filled after we load all the symbols
1740 map__init(self, type, start, 0, 0, dso);
1746 struct map *machine__new_module(struct machine *self, u64 start,
1747 const char *filename)
1750 struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
1755 map = map__new2(start, dso, MAP__FUNCTION);
1759 if (machine__is_host(self))
1760 dso->origin = DSO__ORIG_KMODULE;
1762 dso->origin = DSO__ORIG_GUEST_KMODULE;
1763 map_groups__insert(&self->kmaps, map);
1767 static int machine__create_modules(struct machine *self)
1773 const char *modules;
1774 char path[PATH_MAX];
1776 if (machine__is_default_guest(self))
1777 modules = symbol_conf.default_guest_modules;
1779 sprintf(path, "%s/proc/modules", self->root_dir);
1783 file = fopen(modules, "r");
1787 while (!feof(file)) {
1788 char name[PATH_MAX];
1793 line_len = getline(&line, &n, file);
1800 line[--line_len] = '\0'; /* \n */
1802 sep = strrchr(line, 'x');
1806 hex2u64(sep + 1, &start);
1808 sep = strchr(line, ' ');
1814 snprintf(name, sizeof(name), "[%s]", line);
1815 map = machine__new_module(self, start, name);
1817 goto out_delete_line;
1818 dso__kernel_module_get_build_id(map->dso, self->root_dir);
1824 return machine__set_modules_path(self);
1832 int dso__load_vmlinux(struct dso *self, struct map *map,
1833 const char *vmlinux, symbol_filter_t filter)
1836 char symfs_vmlinux[PATH_MAX];
1838 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
1839 symbol_conf.symfs, vmlinux);
1840 fd = open(symfs_vmlinux, O_RDONLY);
1844 dso__set_loaded(self, map->type);
1845 err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
1849 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1854 int dso__load_vmlinux_path(struct dso *self, struct map *map,
1855 symbol_filter_t filter)
1860 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1861 vmlinux_path__nr_entries + 1);
1863 filename = dso__build_id_filename(self, NULL, 0);
1864 if (filename != NULL) {
1865 err = dso__load_vmlinux(self, map, filename, filter);
1867 dso__set_long_name(self, filename);
1873 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1874 err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
1876 dso__set_long_name(self, strdup(vmlinux_path[i]));
1884 static int dso__load_kernel_sym(struct dso *self, struct map *map,
1885 symbol_filter_t filter)
1888 const char *kallsyms_filename = NULL;
1889 char *kallsyms_allocated_filename = NULL;
1891 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1892 * it and only it, reporting errors to the user if it cannot be used.
1894 * For instance, try to analyse an ARM perf.data file _without_ a
1895 * build-id, or if the user specifies the wrong path to the right
1896 * vmlinux file, obviously we can't fallback to another vmlinux (a
1897 * x86_86 one, on the machine where analysis is being performed, say),
1898 * or worse, /proc/kallsyms.
1900 * If the specified file _has_ a build-id and there is a build-id
1901 * section in the perf.data file, we will still do the expected
1902 * validation in dso__load_vmlinux and will bail out if they don't
1905 if (symbol_conf.kallsyms_name != NULL) {
1906 kallsyms_filename = symbol_conf.kallsyms_name;
1910 if (symbol_conf.vmlinux_name != NULL) {
1911 err = dso__load_vmlinux(self, map,
1912 symbol_conf.vmlinux_name, filter);
1914 dso__set_long_name(self,
1915 strdup(symbol_conf.vmlinux_name));
1921 if (vmlinux_path != NULL) {
1922 err = dso__load_vmlinux_path(self, map, filter);
1927 /* do not try local files if a symfs was given */
1928 if (symbol_conf.symfs[0] != 0)
1932 * Say the kernel DSO was created when processing the build-id header table,
1933 * we have a build-id, so check if it is the same as the running kernel,
1934 * using it if it is.
1936 if (self->has_build_id) {
1937 u8 kallsyms_build_id[BUILD_ID_SIZE];
1938 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1940 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1941 sizeof(kallsyms_build_id)) == 0) {
1942 if (dso__build_id_equal(self, kallsyms_build_id)) {
1943 kallsyms_filename = "/proc/kallsyms";
1948 * Now look if we have it on the build-id cache in
1949 * $HOME/.debug/[kernel.kallsyms].
1951 build_id__sprintf(self->build_id, sizeof(self->build_id),
1954 if (asprintf(&kallsyms_allocated_filename,
1955 "%s/.debug/[kernel.kallsyms]/%s",
1956 getenv("HOME"), sbuild_id) == -1) {
1957 pr_err("Not enough memory for kallsyms file lookup\n");
1961 kallsyms_filename = kallsyms_allocated_filename;
1963 if (access(kallsyms_filename, F_OK)) {
1964 pr_err("No kallsyms or vmlinux with build-id %s "
1965 "was found\n", sbuild_id);
1966 free(kallsyms_allocated_filename);
1971 * Last resort, if we don't have a build-id and couldn't find
1972 * any vmlinux file, try the running kernel kallsyms table.
1974 kallsyms_filename = "/proc/kallsyms";
1978 err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
1980 pr_debug("Using %s for symbols\n", kallsyms_filename);
1981 free(kallsyms_allocated_filename);
1985 if (kallsyms_filename != NULL)
1986 dso__set_long_name(self, strdup("[kernel.kallsyms]"));
1987 map__fixup_start(map);
1988 map__fixup_end(map);
1994 static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
1995 symbol_filter_t filter)
1998 const char *kallsyms_filename = NULL;
1999 struct machine *machine;
2000 char path[PATH_MAX];
2003 pr_debug("Guest kernel map hasn't the point to groups\n");
2006 machine = map->groups->machine;
2008 if (machine__is_default_guest(machine)) {
2010 * if the user specified a vmlinux filename, use it and only
2011 * it, reporting errors to the user if it cannot be used.
2012 * Or use file guest_kallsyms inputted by user on commandline
2014 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2015 err = dso__load_vmlinux(self, map,
2016 symbol_conf.default_guest_vmlinux_name, filter);
2020 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2021 if (!kallsyms_filename)
2024 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2025 kallsyms_filename = path;
2028 err = dso__load_kallsyms(self, kallsyms_filename, map, filter);
2030 pr_debug("Using %s for symbols\n", kallsyms_filename);
2034 if (kallsyms_filename != NULL) {
2035 machine__mmap_name(machine, path, sizeof(path));
2036 dso__set_long_name(self, strdup(path));
2038 map__fixup_start(map);
2039 map__fixup_end(map);
2045 static void dsos__add(struct list_head *head, struct dso *dso)
2047 list_add_tail(&dso->node, head);
2050 static struct dso *dsos__find(struct list_head *head, const char *name)
2054 list_for_each_entry(pos, head, node)
2055 if (strcmp(pos->long_name, name) == 0)
2060 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2062 struct dso *dso = dsos__find(head, name);
2065 dso = dso__new(name);
2067 dsos__add(head, dso);
2068 dso__set_basename(dso);
2075 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2080 list_for_each_entry(pos, head, node) {
2082 for (i = 0; i < MAP__NR_TYPES; ++i)
2083 ret += dso__fprintf(pos, i, fp);
2089 size_t machines__fprintf_dsos(struct rb_root *self, FILE *fp)
2094 for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2095 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2096 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2097 ret += __dsos__fprintf(&pos->user_dsos, fp);
2103 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2109 list_for_each_entry(pos, head, node) {
2110 if (with_hits && !pos->hit)
2112 ret += dso__fprintf_buildid(pos, fp);
2113 ret += fprintf(fp, " %s\n", pos->long_name);
2118 size_t machine__fprintf_dsos_buildid(struct machine *self, FILE *fp, bool with_hits)
2120 return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
2121 __dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
2124 size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
2129 for (nd = rb_first(self); nd; nd = rb_next(nd)) {
2130 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2131 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2136 struct dso *dso__new_kernel(const char *name)
2138 struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
2141 dso__set_short_name(self, "[kernel]");
2142 self->kernel = DSO_TYPE_KERNEL;
2148 static struct dso *dso__new_guest_kernel(struct machine *machine,
2152 struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
2155 dso__set_short_name(self, "[guest.kernel]");
2156 self->kernel = DSO_TYPE_GUEST_KERNEL;
2162 void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
2164 char path[PATH_MAX];
2166 if (machine__is_default_guest(machine))
2168 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2169 if (sysfs__read_build_id(path, self->build_id,
2170 sizeof(self->build_id)) == 0)
2171 self->has_build_id = true;
2174 static struct dso *machine__create_kernel(struct machine *self)
2176 const char *vmlinux_name = NULL;
2179 if (machine__is_host(self)) {
2180 vmlinux_name = symbol_conf.vmlinux_name;
2181 kernel = dso__new_kernel(vmlinux_name);
2183 if (machine__is_default_guest(self))
2184 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2185 kernel = dso__new_guest_kernel(self, vmlinux_name);
2188 if (kernel != NULL) {
2189 dso__read_running_kernel_build_id(kernel, self);
2190 dsos__add(&self->kernel_dsos, kernel);
2195 struct process_args {
2199 static int symbol__in_kernel(void *arg, const char *name,
2200 char type __used, u64 start, u64 end __used)
2202 struct process_args *args = arg;
2204 if (strchr(name, '['))
2207 args->start = start;
2211 /* Figure out the start address of kernel map from /proc/kallsyms */
2212 static u64 machine__get_kernel_start_addr(struct machine *machine)
2214 const char *filename;
2215 char path[PATH_MAX];
2216 struct process_args args;
2218 if (machine__is_host(machine)) {
2219 filename = "/proc/kallsyms";
2221 if (machine__is_default_guest(machine))
2222 filename = (char *)symbol_conf.default_guest_kallsyms;
2224 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2229 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2235 int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
2238 u64 start = machine__get_kernel_start_addr(self);
2240 for (type = 0; type < MAP__NR_TYPES; ++type) {
2243 self->vmlinux_maps[type] = map__new2(start, kernel, type);
2244 if (self->vmlinux_maps[type] == NULL)
2247 self->vmlinux_maps[type]->map_ip =
2248 self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
2250 kmap = map__kmap(self->vmlinux_maps[type]);
2251 kmap->kmaps = &self->kmaps;
2252 map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
2258 void machine__destroy_kernel_maps(struct machine *self)
2262 for (type = 0; type < MAP__NR_TYPES; ++type) {
2265 if (self->vmlinux_maps[type] == NULL)
2268 kmap = map__kmap(self->vmlinux_maps[type]);
2269 map_groups__remove(&self->kmaps, self->vmlinux_maps[type]);
2270 if (kmap->ref_reloc_sym) {
2272 * ref_reloc_sym is shared among all maps, so free just
2275 if (type == MAP__FUNCTION) {
2276 free((char *)kmap->ref_reloc_sym->name);
2277 kmap->ref_reloc_sym->name = NULL;
2278 free(kmap->ref_reloc_sym);
2280 kmap->ref_reloc_sym = NULL;
2283 map__delete(self->vmlinux_maps[type]);
2284 self->vmlinux_maps[type] = NULL;
2288 int machine__create_kernel_maps(struct machine *self)
2290 struct dso *kernel = machine__create_kernel(self);
2292 if (kernel == NULL ||
2293 __machine__create_kernel_maps(self, kernel) < 0)
2296 if (symbol_conf.use_modules && machine__create_modules(self) < 0)
2297 pr_debug("Problems creating module maps, continuing anyway...\n");
2299 * Now that we have all the maps created, just set the ->end of them:
2301 map_groups__fixup_end(&self->kmaps);
2305 static void vmlinux_path__exit(void)
2307 while (--vmlinux_path__nr_entries >= 0) {
2308 free(vmlinux_path[vmlinux_path__nr_entries]);
2309 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2313 vmlinux_path = NULL;
2316 static int vmlinux_path__init(void)
2321 vmlinux_path = malloc(sizeof(char *) * 5);
2322 if (vmlinux_path == NULL)
2325 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2326 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2328 ++vmlinux_path__nr_entries;
2329 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2330 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2332 ++vmlinux_path__nr_entries;
2334 /* only try running kernel version if no symfs was given */
2335 if (symbol_conf.symfs[0] != 0)
2338 if (uname(&uts) < 0)
2341 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2342 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2343 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2345 ++vmlinux_path__nr_entries;
2346 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2347 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2348 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2350 ++vmlinux_path__nr_entries;
2351 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2353 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2354 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2356 ++vmlinux_path__nr_entries;
2361 vmlinux_path__exit();
2365 size_t machine__fprintf_vmlinux_path(struct machine *self, FILE *fp)
2369 struct dso *kdso = self->vmlinux_maps[MAP__FUNCTION]->dso;
2371 if (kdso->has_build_id) {
2372 char filename[PATH_MAX];
2373 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2374 printed += fprintf(fp, "[0] %s\n", filename);
2377 for (i = 0; i < vmlinux_path__nr_entries; ++i)
2378 printed += fprintf(fp, "[%d] %s\n",
2379 i + kdso->has_build_id, vmlinux_path[i]);
2384 static int setup_list(struct strlist **list, const char *list_str,
2385 const char *list_name)
2387 if (list_str == NULL)
2390 *list = strlist__new(true, list_str);
2392 pr_err("problems parsing %s list\n", list_name);
2398 int symbol__init(void)
2402 if (symbol_conf.initialized)
2405 elf_version(EV_CURRENT);
2406 if (symbol_conf.sort_by_name)
2407 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2408 sizeof(struct symbol));
2410 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2413 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2414 pr_err("'.' is the only non valid --field-separator argument\n");
2418 if (setup_list(&symbol_conf.dso_list,
2419 symbol_conf.dso_list_str, "dso") < 0)
2422 if (setup_list(&symbol_conf.comm_list,
2423 symbol_conf.comm_list_str, "comm") < 0)
2424 goto out_free_dso_list;
2426 if (setup_list(&symbol_conf.sym_list,
2427 symbol_conf.sym_list_str, "symbol") < 0)
2428 goto out_free_comm_list;
2431 * A path to symbols of "/" is identical to ""
2432 * reset here for simplicity.
2434 symfs = realpath(symbol_conf.symfs, NULL);
2436 symfs = symbol_conf.symfs;
2437 if (strcmp(symfs, "/") == 0)
2438 symbol_conf.symfs = "";
2439 if (symfs != symbol_conf.symfs)
2440 free((void *)symfs);
2442 symbol_conf.initialized = true;
2446 strlist__delete(symbol_conf.dso_list);
2448 strlist__delete(symbol_conf.comm_list);
2452 void symbol__exit(void)
2454 if (!symbol_conf.initialized)
2456 strlist__delete(symbol_conf.sym_list);
2457 strlist__delete(symbol_conf.dso_list);
2458 strlist__delete(symbol_conf.comm_list);
2459 vmlinux_path__exit();
2460 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2461 symbol_conf.initialized = false;
2464 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)
2466 struct machine *machine = machines__findnew(self, pid);
2468 if (machine == NULL)
2471 return machine__create_kernel_maps(machine);
2474 static int hex(char ch)
2476 if ((ch >= '0') && (ch <= '9'))
2478 if ((ch >= 'a') && (ch <= 'f'))
2479 return ch - 'a' + 10;
2480 if ((ch >= 'A') && (ch <= 'F'))
2481 return ch - 'A' + 10;
2486 * While we find nice hex chars, build a long_val.
2487 * Return number of chars processed.
2489 int hex2u64(const char *ptr, u64 *long_val)
2491 const char *p = ptr;
2495 const int hex_val = hex(*p);
2500 *long_val = (*long_val << 4) | hex_val;
2507 char *strxfrchar(char *s, char from, char to)
2511 while ((p = strchr(p, from)) != NULL)
2517 int machines__create_guest_kernel_maps(struct rb_root *self)
2520 struct dirent **namelist = NULL;
2522 char path[PATH_MAX];
2525 if (symbol_conf.default_guest_vmlinux_name ||
2526 symbol_conf.default_guest_modules ||
2527 symbol_conf.default_guest_kallsyms) {
2528 machines__create_kernel_maps(self, DEFAULT_GUEST_KERNEL_ID);
2531 if (symbol_conf.guestmount) {
2532 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2535 for (i = 0; i < items; i++) {
2536 if (!isdigit(namelist[i]->d_name[0])) {
2537 /* Filter out . and .. */
2540 pid = atoi(namelist[i]->d_name);
2541 sprintf(path, "%s/%s/proc/kallsyms",
2542 symbol_conf.guestmount,
2543 namelist[i]->d_name);
2544 ret = access(path, R_OK);
2546 pr_debug("Can't access file %s\n", path);
2549 machines__create_kernel_maps(self, pid);
2558 void machines__destroy_guest_kernel_maps(struct rb_root *self)
2560 struct rb_node *next = rb_first(self);
2563 struct machine *pos = rb_entry(next, struct machine, rb_node);
2565 next = rb_next(&pos->rb_node);
2566 rb_erase(&pos->rb_node, self);
2567 machine__delete(pos);
2571 int machine__load_kallsyms(struct machine *self, const char *filename,
2572 enum map_type type, symbol_filter_t filter)
2574 struct map *map = self->vmlinux_maps[type];
2575 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2578 dso__set_loaded(map->dso, type);
2580 * Since /proc/kallsyms will have multiple sessions for the
2581 * kernel, with modules between them, fixup the end of all
2584 __map_groups__fixup_end(&self->kmaps, type);
2590 int machine__load_vmlinux_path(struct machine *self, enum map_type type,
2591 symbol_filter_t filter)
2593 struct map *map = self->vmlinux_maps[type];
2594 int ret = dso__load_vmlinux_path(map->dso, map, filter);
2597 dso__set_loaded(map->dso, type);
2598 map__reloc_vmlinux(map);