22 #include <sys/utsname.h>
25 #define KSYM_NAME_LEN 256
28 #ifndef NT_GNU_BUILD_ID
29 #define NT_GNU_BUILD_ID 3
32 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
33 static int elf_read_build_id(Elf *elf, void *bf, size_t size);
34 static void dsos__add(struct list_head *head, struct dso *dso);
35 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
36 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
37 symbol_filter_t filter);
38 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
39 symbol_filter_t filter);
40 static int vmlinux_path__nr_entries;
41 static char **vmlinux_path;
43 struct symbol_conf symbol_conf = {
44 .exclude_other = true,
46 .try_vmlinux_path = true,
51 int dso__name_len(const struct dso *dso)
54 return strlen("[unknown]");
56 return dso->long_name_len;
58 return dso->short_name_len;
61 bool dso__loaded(const struct dso *dso, enum map_type type)
63 return dso->loaded & (1 << type);
66 bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
68 return dso->sorted_by_name & (1 << type);
71 static void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
73 dso->sorted_by_name |= (1 << type);
76 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
78 symbol_type = toupper(symbol_type);
82 return symbol_type == 'T' || symbol_type == 'W';
84 return symbol_type == 'D';
90 static int prefix_underscores_count(const char *str)
92 const char *tail = str;
103 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
108 /* Prefer a symbol with non zero length */
109 a = syma->end - syma->start;
110 b = symb->end - symb->start;
111 if ((b == 0) && (a > 0))
113 else if ((a == 0) && (b > 0))
116 /* Prefer a non weak symbol over a weak one */
117 a = syma->binding == STB_WEAK;
118 b = symb->binding == STB_WEAK;
124 /* Prefer a global symbol over a non global one */
125 a = syma->binding == STB_GLOBAL;
126 b = symb->binding == STB_GLOBAL;
132 /* Prefer a symbol with less underscores */
133 a = prefix_underscores_count(syma->name);
134 b = prefix_underscores_count(symb->name);
140 /* If all else fails, choose the symbol with the longest name */
141 if (strlen(syma->name) >= strlen(symb->name))
147 static void symbols__fixup_duplicate(struct rb_root *symbols)
150 struct symbol *curr, *next;
152 nd = rb_first(symbols);
155 curr = rb_entry(nd, struct symbol, rb_node);
157 nd = rb_next(&curr->rb_node);
158 next = rb_entry(nd, struct symbol, rb_node);
163 if (curr->start != next->start)
166 if (choose_best_symbol(curr, next) == SYMBOL_A) {
167 rb_erase(&next->rb_node, symbols);
170 nd = rb_next(&curr->rb_node);
171 rb_erase(&curr->rb_node, symbols);
176 static void symbols__fixup_end(struct rb_root *symbols)
178 struct rb_node *nd, *prevnd = rb_first(symbols);
179 struct symbol *curr, *prev;
184 curr = rb_entry(prevnd, struct symbol, rb_node);
186 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
188 curr = rb_entry(nd, struct symbol, rb_node);
190 if (prev->end == prev->start && prev->end != curr->start)
191 prev->end = curr->start - 1;
195 if (curr->end == curr->start)
196 curr->end = roundup(curr->start, 4096);
199 static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
201 struct map *prev, *curr;
202 struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
207 curr = rb_entry(prevnd, struct map, rb_node);
209 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
211 curr = rb_entry(nd, struct map, rb_node);
212 prev->end = curr->start - 1;
216 * We still haven't the actual symbols, so guess the
217 * last map final address.
222 static void map_groups__fixup_end(struct map_groups *mg)
225 for (i = 0; i < MAP__NR_TYPES; ++i)
226 __map_groups__fixup_end(mg, i);
229 static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
232 size_t namelen = strlen(name) + 1;
233 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
234 sizeof(*sym) + namelen));
238 if (symbol_conf.priv_size)
239 sym = ((void *)sym) + symbol_conf.priv_size;
242 sym->end = len ? start + len - 1 : start;
243 sym->binding = binding;
244 sym->namelen = namelen - 1;
246 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
247 __func__, name, start, sym->end);
248 memcpy(sym->name, name, namelen);
253 void symbol__delete(struct symbol *sym)
255 free(((void *)sym) - symbol_conf.priv_size);
258 static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
260 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
261 sym->start, sym->end,
262 sym->binding == STB_GLOBAL ? 'g' :
263 sym->binding == STB_LOCAL ? 'l' : 'w',
267 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
268 const struct addr_location *al, FILE *fp)
270 unsigned long offset;
273 if (sym && sym->name) {
274 length = fprintf(fp, "%s", sym->name);
276 offset = al->addr - sym->start;
277 length += fprintf(fp, "+0x%lx", offset);
281 return fprintf(fp, "[unknown]");
284 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
286 return symbol__fprintf_symname_offs(sym, NULL, fp);
289 void dso__set_long_name(struct dso *dso, char *name)
293 dso->long_name = name;
294 dso->long_name_len = strlen(name);
297 static void dso__set_short_name(struct dso *dso, const char *name)
301 dso->short_name = name;
302 dso->short_name_len = strlen(name);
305 static void dso__set_basename(struct dso *dso)
307 dso__set_short_name(dso, basename(dso->long_name));
310 struct dso *dso__new(const char *name)
312 struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
316 strcpy(dso->name, name);
317 dso__set_long_name(dso, dso->name);
318 dso__set_short_name(dso, dso->name);
319 for (i = 0; i < MAP__NR_TYPES; ++i)
320 dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
321 dso->symtab_type = SYMTAB__NOT_FOUND;
323 dso->sorted_by_name = 0;
324 dso->has_build_id = 0;
325 dso->kernel = DSO_TYPE_USER;
326 dso->needs_swap = DSO_SWAP__UNSET;
327 INIT_LIST_HEAD(&dso->node);
333 static void symbols__delete(struct rb_root *symbols)
336 struct rb_node *next = rb_first(symbols);
339 pos = rb_entry(next, struct symbol, rb_node);
340 next = rb_next(&pos->rb_node);
341 rb_erase(&pos->rb_node, symbols);
346 void dso__delete(struct dso *dso)
349 for (i = 0; i < MAP__NR_TYPES; ++i)
350 symbols__delete(&dso->symbols[i]);
351 if (dso->sname_alloc)
352 free((char *)dso->short_name);
353 if (dso->lname_alloc)
354 free(dso->long_name);
358 void dso__set_build_id(struct dso *dso, void *build_id)
360 memcpy(dso->build_id, build_id, sizeof(dso->build_id));
361 dso->has_build_id = 1;
364 static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
366 struct rb_node **p = &symbols->rb_node;
367 struct rb_node *parent = NULL;
368 const u64 ip = sym->start;
373 s = rb_entry(parent, struct symbol, rb_node);
379 rb_link_node(&sym->rb_node, parent, p);
380 rb_insert_color(&sym->rb_node, symbols);
383 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
390 n = symbols->rb_node;
393 struct symbol *s = rb_entry(n, struct symbol, rb_node);
397 else if (ip > s->end)
406 struct symbol_name_rb_node {
407 struct rb_node rb_node;
411 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
413 struct rb_node **p = &symbols->rb_node;
414 struct rb_node *parent = NULL;
415 struct symbol_name_rb_node *symn, *s;
417 symn = container_of(sym, struct symbol_name_rb_node, sym);
421 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
422 if (strcmp(sym->name, s->sym.name) < 0)
427 rb_link_node(&symn->rb_node, parent, p);
428 rb_insert_color(&symn->rb_node, symbols);
431 static void symbols__sort_by_name(struct rb_root *symbols,
432 struct rb_root *source)
436 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
437 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
438 symbols__insert_by_name(symbols, pos);
442 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
450 n = symbols->rb_node;
453 struct symbol_name_rb_node *s;
456 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
457 cmp = strcmp(name, s->sym.name);
470 struct symbol *dso__find_symbol(struct dso *dso,
471 enum map_type type, u64 addr)
473 return symbols__find(&dso->symbols[type], addr);
476 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
479 return symbols__find_by_name(&dso->symbol_names[type], name);
482 void dso__sort_by_name(struct dso *dso, enum map_type type)
484 dso__set_sorted_by_name(dso, type);
485 return symbols__sort_by_name(&dso->symbol_names[type],
486 &dso->symbols[type]);
489 int build_id__sprintf(const u8 *build_id, int len, char *bf)
492 const u8 *raw = build_id;
495 for (i = 0; i < len; ++i) {
496 sprintf(bid, "%02x", *raw);
501 return raw - build_id;
504 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
506 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
508 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
509 return fprintf(fp, "%s", sbuild_id);
512 size_t dso__fprintf_symbols_by_name(struct dso *dso,
513 enum map_type type, FILE *fp)
517 struct symbol_name_rb_node *pos;
519 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
520 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
521 fprintf(fp, "%s\n", pos->sym.name);
527 size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
530 size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
532 if (dso->short_name != dso->long_name)
533 ret += fprintf(fp, "%s, ", dso->long_name);
534 ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
535 dso->loaded ? "" : "NOT ");
536 ret += dso__fprintf_buildid(dso, fp);
537 ret += fprintf(fp, ")\n");
538 for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
539 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
540 ret += symbol__fprintf(pos, fp);
546 int kallsyms__parse(const char *filename, void *arg,
547 int (*process_symbol)(void *arg, const char *name,
548 char type, u64 start, u64 end))
553 FILE *file = fopen(filename, "r");
560 while (!feof(file)) {
566 line_len = getline(&line, &n, file);
567 if (line_len < 0 || !line)
570 line[--line_len] = '\0'; /* \n */
572 len = hex2u64(line, &start);
575 if (len + 2 >= line_len)
578 symbol_type = line[len];
580 symbol_name = line + len;
581 len = line_len - len;
583 if (len >= KSYM_NAME_LEN) {
589 * module symbols are not sorted so we add all
590 * symbols with zero length and rely on
591 * symbols__fixup_end() to fix it up.
593 err = process_symbol(arg, symbol_name,
594 symbol_type, start, start);
607 struct process_kallsyms_args {
612 static u8 kallsyms2elf_type(char type)
617 return isupper(type) ? STB_GLOBAL : STB_LOCAL;
620 static int map__process_kallsym_symbol(void *arg, const char *name,
621 char type, u64 start, u64 end)
624 struct process_kallsyms_args *a = arg;
625 struct rb_root *root = &a->dso->symbols[a->map->type];
627 if (!symbol_type__is_a(type, a->map->type))
630 sym = symbol__new(start, end - start + 1,
631 kallsyms2elf_type(type), name);
635 * We will pass the symbols to the filter later, in
636 * map__split_kallsyms, when we have split the maps per module
638 symbols__insert(root, sym);
644 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
645 * so that we can in the next step set the symbol ->end address and then
646 * call kernel_maps__split_kallsyms.
648 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
651 struct process_kallsyms_args args = { .map = map, .dso = dso, };
652 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
656 * Split the symbols into maps, making sure there are no overlaps, i.e. the
657 * kernel range is broken in several maps, named [kernel].N, as we don't have
658 * the original ELF section names vmlinux have.
660 static int dso__split_kallsyms(struct dso *dso, struct map *map,
661 symbol_filter_t filter)
663 struct map_groups *kmaps = map__kmap(map)->kmaps;
664 struct machine *machine = kmaps->machine;
665 struct map *curr_map = map;
667 int count = 0, moved = 0;
668 struct rb_root *root = &dso->symbols[map->type];
669 struct rb_node *next = rb_first(root);
670 int kernel_range = 0;
675 pos = rb_entry(next, struct symbol, rb_node);
676 next = rb_next(&pos->rb_node);
678 module = strchr(pos->name, '\t');
680 if (!symbol_conf.use_modules)
685 if (strcmp(curr_map->dso->short_name, module)) {
686 if (curr_map != map &&
687 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
688 machine__is_default_guest(machine)) {
690 * We assume all symbols of a module are
691 * continuous in * kallsyms, so curr_map
692 * points to a module and all its
693 * symbols are in its kmap. Mark it as
696 dso__set_loaded(curr_map->dso,
700 curr_map = map_groups__find_by_name(kmaps,
702 if (curr_map == NULL) {
703 pr_debug("%s/proc/{kallsyms,modules} "
704 "inconsistency while looking "
705 "for \"%s\" module!\n",
706 machine->root_dir, module);
711 if (curr_map->dso->loaded &&
712 !machine__is_default_guest(machine))
716 * So that we look just like we get from .ko files,
717 * i.e. not prelinked, relative to map->start.
719 pos->start = curr_map->map_ip(curr_map, pos->start);
720 pos->end = curr_map->map_ip(curr_map, pos->end);
721 } else if (curr_map != map) {
722 char dso_name[PATH_MAX];
730 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
731 snprintf(dso_name, sizeof(dso_name),
735 snprintf(dso_name, sizeof(dso_name),
739 ndso = dso__new(dso_name);
743 ndso->kernel = dso->kernel;
745 curr_map = map__new2(pos->start, ndso, map->type);
746 if (curr_map == NULL) {
751 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
752 map_groups__insert(kmaps, curr_map);
756 if (filter && filter(curr_map, pos)) {
757 discard_symbol: rb_erase(&pos->rb_node, root);
760 if (curr_map != map) {
761 rb_erase(&pos->rb_node, root);
762 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
769 if (curr_map != map &&
770 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
771 machine__is_default_guest(kmaps->machine)) {
772 dso__set_loaded(curr_map->dso, curr_map->type);
775 return count + moved;
778 static bool symbol__restricted_filename(const char *filename,
779 const char *restricted_filename)
781 bool restricted = false;
783 if (symbol_conf.kptr_restrict) {
784 char *r = realpath(filename, NULL);
787 restricted = strcmp(r, restricted_filename) == 0;
796 int dso__load_kallsyms(struct dso *dso, const char *filename,
797 struct map *map, symbol_filter_t filter)
799 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
802 if (dso__load_all_kallsyms(dso, filename, map) < 0)
805 symbols__fixup_duplicate(&dso->symbols[map->type]);
806 symbols__fixup_end(&dso->symbols[map->type]);
808 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
809 dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
811 dso->symtab_type = SYMTAB__KALLSYMS;
813 return dso__split_kallsyms(dso, map, filter);
816 static int dso__load_perf_map(struct dso *dso, struct map *map,
817 symbol_filter_t filter)
824 file = fopen(dso->long_name, "r");
828 while (!feof(file)) {
833 line_len = getline(&line, &n, file);
840 line[--line_len] = '\0'; /* \n */
842 len = hex2u64(line, &start);
845 if (len + 2 >= line_len)
848 len += hex2u64(line + len, &size);
851 if (len + 2 >= line_len)
854 sym = symbol__new(start, size, STB_GLOBAL, line + len);
857 goto out_delete_line;
859 if (filter && filter(map, sym))
862 symbols__insert(&dso->symbols[map->type], sym);
879 * elf_symtab__for_each_symbol - iterate thru all the symbols
881 * @syms: struct elf_symtab instance to iterate
883 * @sym: GElf_Sym iterator
885 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
886 for (idx = 0, gelf_getsym(syms, idx, &sym);\
888 idx++, gelf_getsym(syms, idx, &sym))
890 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
892 return GELF_ST_TYPE(sym->st_info);
895 static inline int elf_sym__is_function(const GElf_Sym *sym)
897 return elf_sym__type(sym) == STT_FUNC &&
899 sym->st_shndx != SHN_UNDEF;
902 static inline bool elf_sym__is_object(const GElf_Sym *sym)
904 return elf_sym__type(sym) == STT_OBJECT &&
906 sym->st_shndx != SHN_UNDEF;
909 static inline int elf_sym__is_label(const GElf_Sym *sym)
911 return elf_sym__type(sym) == STT_NOTYPE &&
913 sym->st_shndx != SHN_UNDEF &&
914 sym->st_shndx != SHN_ABS;
917 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
918 const Elf_Data *secstrs)
920 return secstrs->d_buf + shdr->sh_name;
923 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
924 const Elf_Data *secstrs)
926 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
929 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
930 const Elf_Data *secstrs)
932 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
935 static inline const char *elf_sym__name(const GElf_Sym *sym,
936 const Elf_Data *symstrs)
938 return symstrs->d_buf + sym->st_name;
941 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
942 GElf_Shdr *shp, const char *name,
948 while ((sec = elf_nextscn(elf, sec)) != NULL) {
951 gelf_getshdr(sec, shp);
952 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
953 if (!strcmp(name, str)) {
964 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
965 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
967 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
969 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
970 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
972 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
975 * We need to check if we have a .dynsym, so that we can handle the
976 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
977 * .dynsym or .symtab).
978 * And always look at the original dso, not at debuginfo packages, that
979 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
982 dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map,
983 symbol_filter_t filter)
985 uint32_t nr_rel_entries, idx;
990 GElf_Shdr shdr_rel_plt, shdr_dynsym;
991 Elf_Data *reldata, *syms, *symstrs;
992 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
995 char sympltname[1024];
997 int nr = 0, symidx, fd, err = 0;
999 fd = open(name, O_RDONLY);
1003 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1007 if (gelf_getehdr(elf, &ehdr) == NULL)
1010 scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
1011 ".dynsym", &dynsym_idx);
1012 if (scn_dynsym == NULL)
1015 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
1017 if (scn_plt_rel == NULL) {
1018 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
1020 if (scn_plt_rel == NULL)
1026 if (shdr_rel_plt.sh_link != dynsym_idx)
1029 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
1033 * Fetch the relocation section to find the idxes to the GOT
1034 * and the symbols in the .dynsym they refer to.
1036 reldata = elf_getdata(scn_plt_rel, NULL);
1037 if (reldata == NULL)
1040 syms = elf_getdata(scn_dynsym, NULL);
1044 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
1045 if (scn_symstrs == NULL)
1048 symstrs = elf_getdata(scn_symstrs, NULL);
1049 if (symstrs == NULL)
1052 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
1053 plt_offset = shdr_plt.sh_offset;
1055 if (shdr_rel_plt.sh_type == SHT_RELA) {
1056 GElf_Rela pos_mem, *pos;
1058 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
1060 symidx = GELF_R_SYM(pos->r_info);
1061 plt_offset += shdr_plt.sh_entsize;
1062 gelf_getsym(syms, symidx, &sym);
1063 snprintf(sympltname, sizeof(sympltname),
1064 "%s@plt", elf_sym__name(&sym, symstrs));
1066 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
1067 STB_GLOBAL, sympltname);
1071 if (filter && filter(map, f))
1074 symbols__insert(&dso->symbols[map->type], f);
1078 } else if (shdr_rel_plt.sh_type == SHT_REL) {
1079 GElf_Rel pos_mem, *pos;
1080 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
1082 symidx = GELF_R_SYM(pos->r_info);
1083 plt_offset += shdr_plt.sh_entsize;
1084 gelf_getsym(syms, symidx, &sym);
1085 snprintf(sympltname, sizeof(sympltname),
1086 "%s@plt", elf_sym__name(&sym, symstrs));
1088 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
1089 STB_GLOBAL, sympltname);
1093 if (filter && filter(map, f))
1096 symbols__insert(&dso->symbols[map->type], f);
1111 pr_debug("%s: problems reading %s PLT info.\n",
1112 __func__, dso->long_name);
1116 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
1120 return elf_sym__is_function(sym);
1122 return elf_sym__is_object(sym);
1128 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
1133 return elf_sec__is_text(shdr, secstrs);
1135 return elf_sec__is_data(shdr, secstrs);
1141 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
1143 Elf_Scn *sec = NULL;
1147 while ((sec = elf_nextscn(elf, sec)) != NULL) {
1148 gelf_getshdr(sec, &shdr);
1150 if ((addr >= shdr.sh_addr) &&
1151 (addr < (shdr.sh_addr + shdr.sh_size)))
1160 static int dso__swap_init(struct dso *dso, unsigned char eidata)
1162 static unsigned int const endian = 1;
1164 dso->needs_swap = DSO_SWAP__NO;
1168 /* We are big endian, DSO is little endian. */
1169 if (*(unsigned char const *)&endian != 1)
1170 dso->needs_swap = DSO_SWAP__YES;
1174 /* We are little endian, DSO is big endian. */
1175 if (*(unsigned char const *)&endian != 0)
1176 dso->needs_swap = DSO_SWAP__YES;
1180 pr_err("unrecognized DSO data encoding %d\n", eidata);
1187 static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
1188 int fd, symbol_filter_t filter, int kmodule,
1191 struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
1192 struct map *curr_map = map;
1193 struct dso *curr_dso = dso;
1194 Elf_Data *symstrs, *secstrs;
1199 GElf_Shdr shdr, opdshdr;
1200 Elf_Data *syms, *opddata = NULL;
1202 Elf_Scn *sec, *sec_strndx, *opdsec;
1207 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1209 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
1213 if (gelf_getehdr(elf, &ehdr) == NULL) {
1214 pr_debug("%s: cannot get elf header.\n", __func__);
1218 if (dso__swap_init(dso, ehdr.e_ident[EI_DATA]))
1221 /* Always reject images with a mismatched build-id: */
1222 if (dso->has_build_id) {
1223 u8 build_id[BUILD_ID_SIZE];
1225 if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0)
1228 if (!dso__build_id_equal(dso, build_id))
1232 sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
1237 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
1242 opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
1243 if (opdshdr.sh_type != SHT_PROGBITS)
1246 opddata = elf_rawdata(opdsec, NULL);
1248 syms = elf_getdata(sec, NULL);
1252 sec = elf_getscn(elf, shdr.sh_link);
1256 symstrs = elf_getdata(sec, NULL);
1257 if (symstrs == NULL)
1260 sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1261 if (sec_strndx == NULL)
1264 secstrs = elf_getdata(sec_strndx, NULL);
1265 if (secstrs == NULL)
1268 nr_syms = shdr.sh_size / shdr.sh_entsize;
1270 memset(&sym, 0, sizeof(sym));
1271 if (dso->kernel == DSO_TYPE_USER) {
1272 dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
1273 elf_section_by_name(elf, &ehdr, &shdr,
1274 ".gnu.prelink_undo",
1277 dso->adjust_symbols = 0;
1279 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
1281 const char *elf_name = elf_sym__name(&sym, symstrs);
1282 char *demangled = NULL;
1283 int is_label = elf_sym__is_label(&sym);
1284 const char *section_name;
1286 if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
1287 strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
1288 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
1290 if (!is_label && !elf_sym__is_a(&sym, map->type))
1293 /* Reject ARM ELF "mapping symbols": these aren't unique and
1294 * don't identify functions, so will confuse the profile
1296 if (ehdr.e_machine == EM_ARM) {
1297 if (!strcmp(elf_name, "$a") ||
1298 !strcmp(elf_name, "$d") ||
1299 !strcmp(elf_name, "$t"))
1303 if (opdsec && sym.st_shndx == opdidx) {
1304 u32 offset = sym.st_value - opdshdr.sh_addr;
1305 u64 *opd = opddata->d_buf + offset;
1306 sym.st_value = DSO__SWAP(dso, u64, *opd);
1307 sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
1310 sec = elf_getscn(elf, sym.st_shndx);
1314 gelf_getshdr(sec, &shdr);
1316 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
1319 section_name = elf_sec__name(&shdr, secstrs);
1321 /* On ARM, symbols for thumb functions have 1 added to
1322 * the symbol address as a flag - remove it */
1323 if ((ehdr.e_machine == EM_ARM) &&
1324 (map->type == MAP__FUNCTION) &&
1328 if (dso->kernel != DSO_TYPE_USER || kmodule) {
1329 char dso_name[PATH_MAX];
1331 if (strcmp(section_name,
1332 (curr_dso->short_name +
1333 dso->short_name_len)) == 0)
1336 if (strcmp(section_name, ".text") == 0) {
1342 snprintf(dso_name, sizeof(dso_name),
1343 "%s%s", dso->short_name, section_name);
1345 curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
1346 if (curr_map == NULL) {
1347 u64 start = sym.st_value;
1350 start += map->start + shdr.sh_offset;
1352 curr_dso = dso__new(dso_name);
1353 if (curr_dso == NULL)
1355 curr_dso->kernel = dso->kernel;
1356 curr_dso->long_name = dso->long_name;
1357 curr_dso->long_name_len = dso->long_name_len;
1358 curr_map = map__new2(start, curr_dso,
1360 if (curr_map == NULL) {
1361 dso__delete(curr_dso);
1364 curr_map->map_ip = identity__map_ip;
1365 curr_map->unmap_ip = identity__map_ip;
1366 curr_dso->symtab_type = dso->symtab_type;
1367 map_groups__insert(kmap->kmaps, curr_map);
1368 dsos__add(&dso->node, curr_dso);
1369 dso__set_loaded(curr_dso, map->type);
1371 curr_dso = curr_map->dso;
1376 if (curr_dso->adjust_symbols) {
1377 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1378 "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1379 (u64)sym.st_value, (u64)shdr.sh_addr,
1380 (u64)shdr.sh_offset);
1381 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1384 * We need to figure out if the object was created from C++ sources
1385 * DWARF DW_compile_unit has this, but we don't always have access
1388 demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
1389 if (demangled != NULL)
1390 elf_name = demangled;
1392 f = symbol__new(sym.st_value, sym.st_size,
1393 GELF_ST_BIND(sym.st_info), elf_name);
1398 if (filter && filter(curr_map, f))
1401 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1407 * For misannotated, zeroed, ASM function sizes.
1410 symbols__fixup_duplicate(&dso->symbols[map->type]);
1411 symbols__fixup_end(&dso->symbols[map->type]);
1414 * We need to fixup this here too because we create new
1415 * maps here, for things like vsyscall sections.
1417 __map_groups__fixup_end(kmap->kmaps, map->type);
1427 static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1429 return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1432 bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
1434 bool have_build_id = false;
1437 list_for_each_entry(pos, head, node) {
1438 if (with_hits && !pos->hit)
1440 if (pos->has_build_id) {
1441 have_build_id = true;
1444 if (filename__read_build_id(pos->long_name, pos->build_id,
1445 sizeof(pos->build_id)) > 0) {
1446 have_build_id = true;
1447 pos->has_build_id = true;
1451 return have_build_id;
1455 * Align offset to 4 bytes as needed for note name and descriptor data.
1457 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1459 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
1469 if (size < BUILD_ID_SIZE)
1473 if (ek != ELF_K_ELF)
1476 if (gelf_getehdr(elf, &ehdr) == NULL) {
1477 pr_err("%s: cannot get elf header.\n", __func__);
1482 * Check following sections for notes:
1483 * '.note.gnu.build-id'
1485 * '.note' (VDSO specific)
1488 sec = elf_section_by_name(elf, &ehdr, &shdr,
1489 ".note.gnu.build-id", NULL);
1493 sec = elf_section_by_name(elf, &ehdr, &shdr,
1498 sec = elf_section_by_name(elf, &ehdr, &shdr,
1507 data = elf_getdata(sec, NULL);
1512 while (ptr < (data->d_buf + data->d_size)) {
1513 GElf_Nhdr *nhdr = ptr;
1514 size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
1515 descsz = NOTE_ALIGN(nhdr->n_descsz);
1518 ptr += sizeof(*nhdr);
1521 if (nhdr->n_type == NT_GNU_BUILD_ID &&
1522 nhdr->n_namesz == sizeof("GNU")) {
1523 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
1524 size_t sz = min(size, descsz);
1525 memcpy(bf, ptr, sz);
1526 memset(bf + sz, 0, size - sz);
1538 int filename__read_build_id(const char *filename, void *bf, size_t size)
1543 if (size < BUILD_ID_SIZE)
1546 fd = open(filename, O_RDONLY);
1550 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1552 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1556 err = elf_read_build_id(elf, bf, size);
1565 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
1569 if (size < BUILD_ID_SIZE)
1572 fd = open(filename, O_RDONLY);
1579 size_t namesz, descsz;
1581 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
1584 namesz = NOTE_ALIGN(nhdr.n_namesz);
1585 descsz = NOTE_ALIGN(nhdr.n_descsz);
1586 if (nhdr.n_type == NT_GNU_BUILD_ID &&
1587 nhdr.n_namesz == sizeof("GNU")) {
1588 if (read(fd, bf, namesz) != (ssize_t)namesz)
1590 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
1591 size_t sz = min(descsz, size);
1592 if (read(fd, build_id, sz) == (ssize_t)sz) {
1593 memset(build_id + sz, 0, size - sz);
1597 } else if (read(fd, bf, descsz) != (ssize_t)descsz)
1600 int n = namesz + descsz;
1601 if (read(fd, bf, n) != n)
1610 static int filename__read_debuglink(const char *filename,
1611 char *debuglink, size_t size)
1621 fd = open(filename, O_RDONLY);
1625 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1627 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
1632 if (ek != ELF_K_ELF)
1635 if (gelf_getehdr(elf, &ehdr) == NULL) {
1636 pr_err("%s: cannot get elf header.\n", __func__);
1640 sec = elf_section_by_name(elf, &ehdr, &shdr,
1641 ".gnu_debuglink", NULL);
1645 data = elf_getdata(sec, NULL);
1649 /* the start of this section is a zero-terminated string */
1650 strncpy(debuglink, data->d_buf, size);
1660 char dso__symtab_origin(const struct dso *dso)
1662 static const char origin[] = {
1663 [SYMTAB__KALLSYMS] = 'k',
1664 [SYMTAB__JAVA_JIT] = 'j',
1665 [SYMTAB__DEBUGLINK] = 'l',
1666 [SYMTAB__BUILD_ID_CACHE] = 'B',
1667 [SYMTAB__FEDORA_DEBUGINFO] = 'f',
1668 [SYMTAB__UBUNTU_DEBUGINFO] = 'u',
1669 [SYMTAB__BUILDID_DEBUGINFO] = 'b',
1670 [SYMTAB__SYSTEM_PATH_DSO] = 'd',
1671 [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
1672 [SYMTAB__GUEST_KALLSYMS] = 'g',
1673 [SYMTAB__GUEST_KMODULE] = 'G',
1676 if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
1678 return origin[dso->symtab_type];
1681 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1683 int size = PATH_MAX;
1687 struct machine *machine;
1688 const char *root_dir;
1691 dso__set_loaded(dso, map->type);
1693 if (dso->kernel == DSO_TYPE_KERNEL)
1694 return dso__load_kernel_sym(dso, map, filter);
1695 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1696 return dso__load_guest_kernel_sym(dso, map, filter);
1698 if (map->groups && map->groups->machine)
1699 machine = map->groups->machine;
1703 name = malloc(size);
1707 dso->adjust_symbols = 0;
1709 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1712 if (lstat(dso->name, &st) < 0)
1715 if (st.st_uid && (st.st_uid != geteuid())) {
1716 pr_warning("File %s not owned by current user or root, "
1717 "ignoring it.\n", dso->name);
1721 ret = dso__load_perf_map(dso, map, filter);
1722 dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
1727 /* Iterate over candidate debug images.
1728 * On the first pass, only load images if they have a full symtab.
1729 * Failing that, do a second pass where we accept .dynsym also
1733 for (dso->symtab_type = SYMTAB__DEBUGLINK;
1734 dso->symtab_type != SYMTAB__NOT_FOUND;
1735 dso->symtab_type++) {
1736 switch (dso->symtab_type) {
1737 case SYMTAB__DEBUGLINK: {
1739 strncpy(name, dso->long_name, size);
1740 debuglink = name + dso->long_name_len;
1741 while (debuglink != name && *debuglink != '/')
1743 if (*debuglink == '/')
1745 filename__read_debuglink(dso->long_name, debuglink,
1746 size - (debuglink - name));
1749 case SYMTAB__BUILD_ID_CACHE:
1750 /* skip the locally configured cache if a symfs is given */
1751 if (symbol_conf.symfs[0] ||
1752 (dso__build_id_filename(dso, name, size) == NULL)) {
1756 case SYMTAB__FEDORA_DEBUGINFO:
1757 snprintf(name, size, "%s/usr/lib/debug%s.debug",
1758 symbol_conf.symfs, dso->long_name);
1760 case SYMTAB__UBUNTU_DEBUGINFO:
1761 snprintf(name, size, "%s/usr/lib/debug%s",
1762 symbol_conf.symfs, dso->long_name);
1764 case SYMTAB__BUILDID_DEBUGINFO: {
1765 char build_id_hex[BUILD_ID_SIZE * 2 + 1];
1767 if (!dso->has_build_id)
1770 build_id__sprintf(dso->build_id,
1771 sizeof(dso->build_id),
1773 snprintf(name, size,
1774 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1775 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
1778 case SYMTAB__SYSTEM_PATH_DSO:
1779 snprintf(name, size, "%s%s",
1780 symbol_conf.symfs, dso->long_name);
1782 case SYMTAB__GUEST_KMODULE:
1783 if (map->groups && machine)
1784 root_dir = machine->root_dir;
1787 snprintf(name, size, "%s%s%s", symbol_conf.symfs,
1788 root_dir, dso->long_name);
1791 case SYMTAB__SYSTEM_PATH_KMODULE:
1792 snprintf(name, size, "%s%s", symbol_conf.symfs,
1798 /* Name is now the name of the next image to try */
1799 fd = open(name, O_RDONLY);
1803 ret = dso__load_sym(dso, map, name, fd, filter, 0,
1808 * Some people seem to have debuginfo files _WITHOUT_ debug
1817 nr_plt = dso__synthesize_plt_symbols(dso, name, map, filter);
1825 * If we wanted a full symtab but no image had one,
1826 * relax our requirements and repeat the search.
1828 if (ret <= 0 && want_symtab) {
1834 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1839 struct map *map_groups__find_by_name(struct map_groups *mg,
1840 enum map_type type, const char *name)
1844 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1845 struct map *map = rb_entry(nd, struct map, rb_node);
1847 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1854 static int dso__kernel_module_get_build_id(struct dso *dso,
1855 const char *root_dir)
1857 char filename[PATH_MAX];
1859 * kernel module short names are of the form "[module]" and
1860 * we need just "module" here.
1862 const char *name = dso->short_name + 1;
1864 snprintf(filename, sizeof(filename),
1865 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1866 root_dir, (int)strlen(name) - 1, name);
1868 if (sysfs__read_build_id(filename, dso->build_id,
1869 sizeof(dso->build_id)) == 0)
1870 dso->has_build_id = true;
1875 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1876 const char *dir_name)
1878 struct dirent *dent;
1879 DIR *dir = opendir(dir_name);
1883 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1887 while ((dent = readdir(dir)) != NULL) {
1888 char path[PATH_MAX];
1891 /*sshfs might return bad dent->d_type, so we have to stat*/
1892 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
1893 if (stat(path, &st))
1896 if (S_ISDIR(st.st_mode)) {
1897 if (!strcmp(dent->d_name, ".") ||
1898 !strcmp(dent->d_name, ".."))
1901 ret = map_groups__set_modules_path_dir(mg, path);
1905 char *dot = strrchr(dent->d_name, '.'),
1910 if (dot == NULL || strcmp(dot, ".ko"))
1912 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
1913 (int)(dot - dent->d_name), dent->d_name);
1915 strxfrchar(dso_name, '-', '_');
1916 map = map_groups__find_by_name(mg, MAP__FUNCTION,
1921 long_name = strdup(path);
1922 if (long_name == NULL) {
1926 dso__set_long_name(map->dso, long_name);
1927 map->dso->lname_alloc = 1;
1928 dso__kernel_module_get_build_id(map->dso, "");
1937 static char *get_kernel_version(const char *root_dir)
1939 char version[PATH_MAX];
1942 const char *prefix = "Linux version ";
1944 sprintf(version, "%s/proc/version", root_dir);
1945 file = fopen(version, "r");
1950 tmp = fgets(version, sizeof(version), file);
1953 name = strstr(version, prefix);
1956 name += strlen(prefix);
1957 tmp = strchr(name, ' ');
1961 return strdup(name);
1964 static int machine__set_modules_path(struct machine *machine)
1967 char modules_path[PATH_MAX];
1969 version = get_kernel_version(machine->root_dir);
1973 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
1974 machine->root_dir, version);
1977 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
1981 * Constructor variant for modules (where we know from /proc/modules where
1982 * they are loaded) and for vmlinux, where only after we load all the
1983 * symbols we'll know where it starts and ends.
1985 static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
1987 struct map *map = calloc(1, (sizeof(*map) +
1988 (dso->kernel ? sizeof(struct kmap) : 0)));
1991 * ->end will be filled after we load all the symbols
1993 map__init(map, type, start, 0, 0, dso);
1999 struct map *machine__new_module(struct machine *machine, u64 start,
2000 const char *filename)
2003 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
2008 map = map__new2(start, dso, MAP__FUNCTION);
2012 if (machine__is_host(machine))
2013 dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
2015 dso->symtab_type = SYMTAB__GUEST_KMODULE;
2016 map_groups__insert(&machine->kmaps, map);
2020 static int machine__create_modules(struct machine *machine)
2026 const char *modules;
2027 char path[PATH_MAX];
2029 if (machine__is_default_guest(machine))
2030 modules = symbol_conf.default_guest_modules;
2032 sprintf(path, "%s/proc/modules", machine->root_dir);
2036 if (symbol__restricted_filename(path, "/proc/modules"))
2039 file = fopen(modules, "r");
2043 while (!feof(file)) {
2044 char name[PATH_MAX];
2049 line_len = getline(&line, &n, file);
2056 line[--line_len] = '\0'; /* \n */
2058 sep = strrchr(line, 'x');
2062 hex2u64(sep + 1, &start);
2064 sep = strchr(line, ' ');
2070 snprintf(name, sizeof(name), "[%s]", line);
2071 map = machine__new_module(machine, start, name);
2073 goto out_delete_line;
2074 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
2080 return machine__set_modules_path(machine);
2088 int dso__load_vmlinux(struct dso *dso, struct map *map,
2089 const char *vmlinux, symbol_filter_t filter)
2092 char symfs_vmlinux[PATH_MAX];
2094 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
2095 symbol_conf.symfs, vmlinux);
2096 fd = open(symfs_vmlinux, O_RDONLY);
2100 dso__set_long_name(dso, (char *)vmlinux);
2101 dso__set_loaded(dso, map->type);
2102 err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
2106 pr_debug("Using %s for symbols\n", symfs_vmlinux);
2111 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
2112 symbol_filter_t filter)
2117 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
2118 vmlinux_path__nr_entries + 1);
2120 filename = dso__build_id_filename(dso, NULL, 0);
2121 if (filename != NULL) {
2122 err = dso__load_vmlinux(dso, map, filename, filter);
2124 dso__set_long_name(dso, filename);
2130 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
2131 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
2133 dso__set_long_name(dso, strdup(vmlinux_path[i]));
2141 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
2142 symbol_filter_t filter)
2145 const char *kallsyms_filename = NULL;
2146 char *kallsyms_allocated_filename = NULL;
2148 * Step 1: if the user specified a kallsyms or vmlinux filename, use
2149 * it and only it, reporting errors to the user if it cannot be used.
2151 * For instance, try to analyse an ARM perf.data file _without_ a
2152 * build-id, or if the user specifies the wrong path to the right
2153 * vmlinux file, obviously we can't fallback to another vmlinux (a
2154 * x86_86 one, on the machine where analysis is being performed, say),
2155 * or worse, /proc/kallsyms.
2157 * If the specified file _has_ a build-id and there is a build-id
2158 * section in the perf.data file, we will still do the expected
2159 * validation in dso__load_vmlinux and will bail out if they don't
2162 if (symbol_conf.kallsyms_name != NULL) {
2163 kallsyms_filename = symbol_conf.kallsyms_name;
2167 if (symbol_conf.vmlinux_name != NULL) {
2168 err = dso__load_vmlinux(dso, map,
2169 symbol_conf.vmlinux_name, filter);
2171 dso__set_long_name(dso,
2172 strdup(symbol_conf.vmlinux_name));
2178 if (vmlinux_path != NULL) {
2179 err = dso__load_vmlinux_path(dso, map, filter);
2184 /* do not try local files if a symfs was given */
2185 if (symbol_conf.symfs[0] != 0)
2189 * Say the kernel DSO was created when processing the build-id header table,
2190 * we have a build-id, so check if it is the same as the running kernel,
2191 * using it if it is.
2193 if (dso->has_build_id) {
2194 u8 kallsyms_build_id[BUILD_ID_SIZE];
2195 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
2197 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
2198 sizeof(kallsyms_build_id)) == 0) {
2199 if (dso__build_id_equal(dso, kallsyms_build_id)) {
2200 kallsyms_filename = "/proc/kallsyms";
2205 * Now look if we have it on the build-id cache in
2206 * $HOME/.debug/[kernel.kallsyms].
2208 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
2211 if (asprintf(&kallsyms_allocated_filename,
2212 "%s/.debug/[kernel.kallsyms]/%s",
2213 getenv("HOME"), sbuild_id) == -1) {
2214 pr_err("Not enough memory for kallsyms file lookup\n");
2218 kallsyms_filename = kallsyms_allocated_filename;
2220 if (access(kallsyms_filename, F_OK)) {
2221 pr_err("No kallsyms or vmlinux with build-id %s "
2222 "was found\n", sbuild_id);
2223 free(kallsyms_allocated_filename);
2228 * Last resort, if we don't have a build-id and couldn't find
2229 * any vmlinux file, try the running kernel kallsyms table.
2231 kallsyms_filename = "/proc/kallsyms";
2235 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2237 pr_debug("Using %s for symbols\n", kallsyms_filename);
2238 free(kallsyms_allocated_filename);
2242 if (kallsyms_filename != NULL)
2243 dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
2244 map__fixup_start(map);
2245 map__fixup_end(map);
2251 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
2252 symbol_filter_t filter)
2255 const char *kallsyms_filename = NULL;
2256 struct machine *machine;
2257 char path[PATH_MAX];
2260 pr_debug("Guest kernel map hasn't the point to groups\n");
2263 machine = map->groups->machine;
2265 if (machine__is_default_guest(machine)) {
2267 * if the user specified a vmlinux filename, use it and only
2268 * it, reporting errors to the user if it cannot be used.
2269 * Or use file guest_kallsyms inputted by user on commandline
2271 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2272 err = dso__load_vmlinux(dso, map,
2273 symbol_conf.default_guest_vmlinux_name, filter);
2277 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2278 if (!kallsyms_filename)
2281 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2282 kallsyms_filename = path;
2285 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
2287 pr_debug("Using %s for symbols\n", kallsyms_filename);
2291 if (kallsyms_filename != NULL) {
2292 machine__mmap_name(machine, path, sizeof(path));
2293 dso__set_long_name(dso, strdup(path));
2295 map__fixup_start(map);
2296 map__fixup_end(map);
2302 static void dsos__add(struct list_head *head, struct dso *dso)
2304 list_add_tail(&dso->node, head);
2307 static struct dso *dsos__find(struct list_head *head, const char *name)
2311 list_for_each_entry(pos, head, node)
2312 if (strcmp(pos->long_name, name) == 0)
2317 struct dso *__dsos__findnew(struct list_head *head, const char *name)
2319 struct dso *dso = dsos__find(head, name);
2322 dso = dso__new(name);
2324 dsos__add(head, dso);
2325 dso__set_basename(dso);
2332 size_t __dsos__fprintf(struct list_head *head, FILE *fp)
2337 list_for_each_entry(pos, head, node) {
2339 for (i = 0; i < MAP__NR_TYPES; ++i)
2340 ret += dso__fprintf(pos, i, fp);
2346 size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
2351 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2352 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2353 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
2354 ret += __dsos__fprintf(&pos->user_dsos, fp);
2360 static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
2366 list_for_each_entry(pos, head, node) {
2367 if (with_hits && !pos->hit)
2369 ret += dso__fprintf_buildid(pos, fp);
2370 ret += fprintf(fp, " %s\n", pos->long_name);
2375 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
2378 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
2379 __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
2382 size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
2383 FILE *fp, bool with_hits)
2388 for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
2389 struct machine *pos = rb_entry(nd, struct machine, rb_node);
2390 ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
2396 dso__kernel_findnew(struct machine *machine, const char *name,
2397 const char *short_name, int dso_type)
2400 * The kernel dso could be created by build_id processing.
2402 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);
2405 * We need to run this in all cases, since during the build_id
2406 * processing we had no idea this was the kernel dso.
2409 dso__set_short_name(dso, short_name);
2410 dso->kernel = dso_type;
2416 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
2418 char path[PATH_MAX];
2420 if (machine__is_default_guest(machine))
2422 sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
2423 if (sysfs__read_build_id(path, dso->build_id,
2424 sizeof(dso->build_id)) == 0)
2425 dso->has_build_id = true;
2428 static struct dso *machine__get_kernel(struct machine *machine)
2430 const char *vmlinux_name = NULL;
2433 if (machine__is_host(machine)) {
2434 vmlinux_name = symbol_conf.vmlinux_name;
2436 vmlinux_name = "[kernel.kallsyms]";
2438 kernel = dso__kernel_findnew(machine, vmlinux_name,
2444 if (machine__is_default_guest(machine))
2445 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
2447 vmlinux_name = machine__mmap_name(machine, bf,
2450 kernel = dso__kernel_findnew(machine, vmlinux_name,
2452 DSO_TYPE_GUEST_KERNEL);
2455 if (kernel != NULL && (!kernel->has_build_id))
2456 dso__read_running_kernel_build_id(kernel, machine);
2461 struct process_args {
2465 static int symbol__in_kernel(void *arg, const char *name,
2466 char type __used, u64 start, u64 end __used)
2468 struct process_args *args = arg;
2470 if (strchr(name, '['))
2473 args->start = start;
2477 /* Figure out the start address of kernel map from /proc/kallsyms */
2478 static u64 machine__get_kernel_start_addr(struct machine *machine)
2480 const char *filename;
2481 char path[PATH_MAX];
2482 struct process_args args;
2484 if (machine__is_host(machine)) {
2485 filename = "/proc/kallsyms";
2487 if (machine__is_default_guest(machine))
2488 filename = (char *)symbol_conf.default_guest_kallsyms;
2490 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2495 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
2498 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
2504 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
2507 u64 start = machine__get_kernel_start_addr(machine);
2509 for (type = 0; type < MAP__NR_TYPES; ++type) {
2512 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
2513 if (machine->vmlinux_maps[type] == NULL)
2516 machine->vmlinux_maps[type]->map_ip =
2517 machine->vmlinux_maps[type]->unmap_ip =
2519 kmap = map__kmap(machine->vmlinux_maps[type]);
2520 kmap->kmaps = &machine->kmaps;
2521 map_groups__insert(&machine->kmaps,
2522 machine->vmlinux_maps[type]);
2528 void machine__destroy_kernel_maps(struct machine *machine)
2532 for (type = 0; type < MAP__NR_TYPES; ++type) {
2535 if (machine->vmlinux_maps[type] == NULL)
2538 kmap = map__kmap(machine->vmlinux_maps[type]);
2539 map_groups__remove(&machine->kmaps,
2540 machine->vmlinux_maps[type]);
2541 if (kmap->ref_reloc_sym) {
2543 * ref_reloc_sym is shared among all maps, so free just
2546 if (type == MAP__FUNCTION) {
2547 free((char *)kmap->ref_reloc_sym->name);
2548 kmap->ref_reloc_sym->name = NULL;
2549 free(kmap->ref_reloc_sym);
2551 kmap->ref_reloc_sym = NULL;
2554 map__delete(machine->vmlinux_maps[type]);
2555 machine->vmlinux_maps[type] = NULL;
2559 int machine__create_kernel_maps(struct machine *machine)
2561 struct dso *kernel = machine__get_kernel(machine);
2563 if (kernel == NULL ||
2564 __machine__create_kernel_maps(machine, kernel) < 0)
2567 if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
2568 pr_debug("Problems creating module maps, continuing anyway...\n");
2570 * Now that we have all the maps created, just set the ->end of them:
2572 map_groups__fixup_end(&machine->kmaps);
2576 static void vmlinux_path__exit(void)
2578 while (--vmlinux_path__nr_entries >= 0) {
2579 free(vmlinux_path[vmlinux_path__nr_entries]);
2580 vmlinux_path[vmlinux_path__nr_entries] = NULL;
2584 vmlinux_path = NULL;
2587 static int vmlinux_path__init(void)
2592 vmlinux_path = malloc(sizeof(char *) * 5);
2593 if (vmlinux_path == NULL)
2596 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
2597 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2599 ++vmlinux_path__nr_entries;
2600 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
2601 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2603 ++vmlinux_path__nr_entries;
2605 /* only try running kernel version if no symfs was given */
2606 if (symbol_conf.symfs[0] != 0)
2609 if (uname(&uts) < 0)
2612 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
2613 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2614 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2616 ++vmlinux_path__nr_entries;
2617 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
2618 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2619 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2621 ++vmlinux_path__nr_entries;
2622 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
2624 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
2625 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2627 ++vmlinux_path__nr_entries;
2632 vmlinux_path__exit();
2636 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
2640 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
2642 if (kdso->has_build_id) {
2643 char filename[PATH_MAX];
2644 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
2645 printed += fprintf(fp, "[0] %s\n", filename);
2648 for (i = 0; i < vmlinux_path__nr_entries; ++i)
2649 printed += fprintf(fp, "[%d] %s\n",
2650 i + kdso->has_build_id, vmlinux_path[i]);
2655 static int setup_list(struct strlist **list, const char *list_str,
2656 const char *list_name)
2658 if (list_str == NULL)
2661 *list = strlist__new(true, list_str);
2663 pr_err("problems parsing %s list\n", list_name);
2669 static bool symbol__read_kptr_restrict(void)
2673 if (geteuid() != 0) {
2674 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2678 if (fgets(line, sizeof(line), fp) != NULL)
2679 value = atoi(line) != 0;
2688 int symbol__init(void)
2692 if (symbol_conf.initialized)
2695 symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
2697 elf_version(EV_CURRENT);
2698 if (symbol_conf.sort_by_name)
2699 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2700 sizeof(struct symbol));
2702 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
2705 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2706 pr_err("'.' is the only non valid --field-separator argument\n");
2710 if (setup_list(&symbol_conf.dso_list,
2711 symbol_conf.dso_list_str, "dso") < 0)
2714 if (setup_list(&symbol_conf.comm_list,
2715 symbol_conf.comm_list_str, "comm") < 0)
2716 goto out_free_dso_list;
2718 if (setup_list(&symbol_conf.sym_list,
2719 symbol_conf.sym_list_str, "symbol") < 0)
2720 goto out_free_comm_list;
2723 * A path to symbols of "/" is identical to ""
2724 * reset here for simplicity.
2726 symfs = realpath(symbol_conf.symfs, NULL);
2728 symfs = symbol_conf.symfs;
2729 if (strcmp(symfs, "/") == 0)
2730 symbol_conf.symfs = "";
2731 if (symfs != symbol_conf.symfs)
2732 free((void *)symfs);
2734 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2736 symbol_conf.initialized = true;
2740 strlist__delete(symbol_conf.comm_list);
2742 strlist__delete(symbol_conf.dso_list);
2746 void symbol__exit(void)
2748 if (!symbol_conf.initialized)
2750 strlist__delete(symbol_conf.sym_list);
2751 strlist__delete(symbol_conf.dso_list);
2752 strlist__delete(symbol_conf.comm_list);
2753 vmlinux_path__exit();
2754 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2755 symbol_conf.initialized = false;
2758 int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
2760 struct machine *machine = machines__findnew(machines, pid);
2762 if (machine == NULL)
2765 return machine__create_kernel_maps(machine);
2768 static int hex(char ch)
2770 if ((ch >= '0') && (ch <= '9'))
2772 if ((ch >= 'a') && (ch <= 'f'))
2773 return ch - 'a' + 10;
2774 if ((ch >= 'A') && (ch <= 'F'))
2775 return ch - 'A' + 10;
2780 * While we find nice hex chars, build a long_val.
2781 * Return number of chars processed.
2783 int hex2u64(const char *ptr, u64 *long_val)
2785 const char *p = ptr;
2789 const int hex_val = hex(*p);
2794 *long_val = (*long_val << 4) | hex_val;
2801 char *strxfrchar(char *s, char from, char to)
2805 while ((p = strchr(p, from)) != NULL)
2811 int machines__create_guest_kernel_maps(struct rb_root *machines)
2814 struct dirent **namelist = NULL;
2816 char path[PATH_MAX];
2819 if (symbol_conf.default_guest_vmlinux_name ||
2820 symbol_conf.default_guest_modules ||
2821 symbol_conf.default_guest_kallsyms) {
2822 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
2825 if (symbol_conf.guestmount) {
2826 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
2829 for (i = 0; i < items; i++) {
2830 if (!isdigit(namelist[i]->d_name[0])) {
2831 /* Filter out . and .. */
2834 pid = atoi(namelist[i]->d_name);
2835 sprintf(path, "%s/%s/proc/kallsyms",
2836 symbol_conf.guestmount,
2837 namelist[i]->d_name);
2838 ret = access(path, R_OK);
2840 pr_debug("Can't access file %s\n", path);
2843 machines__create_kernel_maps(machines, pid);
2852 void machines__destroy_guest_kernel_maps(struct rb_root *machines)
2854 struct rb_node *next = rb_first(machines);
2857 struct machine *pos = rb_entry(next, struct machine, rb_node);
2859 next = rb_next(&pos->rb_node);
2860 rb_erase(&pos->rb_node, machines);
2861 machine__delete(pos);
2865 int machine__load_kallsyms(struct machine *machine, const char *filename,
2866 enum map_type type, symbol_filter_t filter)
2868 struct map *map = machine->vmlinux_maps[type];
2869 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
2872 dso__set_loaded(map->dso, type);
2874 * Since /proc/kallsyms will have multiple sessions for the
2875 * kernel, with modules between them, fixup the end of all
2878 __map_groups__fixup_end(&machine->kmaps, type);
2884 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
2885 symbol_filter_t filter)
2887 struct map *map = machine->vmlinux_maps[type];
2888 int ret = dso__load_vmlinux_path(map->dso, map, filter);
2891 dso__set_loaded(map->dso, type);
2892 map__reloc_vmlinux(map);
2898 struct map *dso__new_map(const char *name)
2900 struct map *map = NULL;
2901 struct dso *dso = dso__new(name);
2904 map = map__new2(0, dso, MAP__FUNCTION);