21 #include <symbol/kallsyms.h>
22 #include <sys/utsname.h>
24 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
25 symbol_filter_t filter);
26 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
27 symbol_filter_t filter);
28 int vmlinux_path__nr_entries;
31 struct symbol_conf symbol_conf = {
33 .try_vmlinux_path = true,
39 static enum dso_binary_type binary_type_symtab[] = {
40 DSO_BINARY_TYPE__KALLSYMS,
41 DSO_BINARY_TYPE__GUEST_KALLSYMS,
42 DSO_BINARY_TYPE__JAVA_JIT,
43 DSO_BINARY_TYPE__DEBUGLINK,
44 DSO_BINARY_TYPE__BUILD_ID_CACHE,
45 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
46 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
47 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
48 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
49 DSO_BINARY_TYPE__GUEST_KMODULE,
50 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
51 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
52 DSO_BINARY_TYPE__NOT_FOUND,
55 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
57 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
59 symbol_type = toupper(symbol_type);
63 return symbol_type == 'T' || symbol_type == 'W';
65 return symbol_type == 'D';
71 static int prefix_underscores_count(const char *str)
73 const char *tail = str;
84 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
90 /* Prefer a symbol with non zero length */
91 a = syma->end - syma->start;
92 b = symb->end - symb->start;
93 if ((b == 0) && (a > 0))
95 else if ((a == 0) && (b > 0))
98 /* Prefer a non weak symbol over a weak one */
99 a = syma->binding == STB_WEAK;
100 b = symb->binding == STB_WEAK;
106 /* Prefer a global symbol over a non global one */
107 a = syma->binding == STB_GLOBAL;
108 b = symb->binding == STB_GLOBAL;
114 /* Prefer a symbol with less underscores */
115 a = prefix_underscores_count(syma->name);
116 b = prefix_underscores_count(symb->name);
122 /* Choose the symbol with the longest name */
123 na = strlen(syma->name);
124 nb = strlen(symb->name);
130 /* Avoid "SyS" kernel syscall aliases */
131 if (na >= 3 && !strncmp(syma->name, "SyS", 3))
133 if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
139 void symbols__fixup_duplicate(struct rb_root *symbols)
142 struct symbol *curr, *next;
144 nd = rb_first(symbols);
147 curr = rb_entry(nd, struct symbol, rb_node);
149 nd = rb_next(&curr->rb_node);
150 next = rb_entry(nd, struct symbol, rb_node);
155 if (curr->start != next->start)
158 if (choose_best_symbol(curr, next) == SYMBOL_A) {
159 rb_erase(&next->rb_node, symbols);
160 symbol__delete(next);
163 nd = rb_next(&curr->rb_node);
164 rb_erase(&curr->rb_node, symbols);
165 symbol__delete(curr);
170 void symbols__fixup_end(struct rb_root *symbols)
172 struct rb_node *nd, *prevnd = rb_first(symbols);
173 struct symbol *curr, *prev;
178 curr = rb_entry(prevnd, struct symbol, rb_node);
180 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
182 curr = rb_entry(nd, struct symbol, rb_node);
184 if (prev->end == prev->start && prev->end != curr->start)
185 prev->end = curr->start - 1;
189 if (curr->end == curr->start)
190 curr->end = roundup(curr->start, 4096);
193 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
195 struct map *prev, *curr;
196 struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
201 curr = rb_entry(prevnd, struct map, rb_node);
203 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
205 curr = rb_entry(nd, struct map, rb_node);
206 prev->end = curr->start - 1;
210 * We still haven't the actual symbols, so guess the
211 * last map final address.
216 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
218 size_t namelen = strlen(name) + 1;
219 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
220 sizeof(*sym) + namelen));
224 if (symbol_conf.priv_size)
225 sym = ((void *)sym) + symbol_conf.priv_size;
228 sym->end = len ? start + len - 1 : start;
229 sym->binding = binding;
230 sym->namelen = namelen - 1;
232 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
233 __func__, name, start, sym->end);
234 memcpy(sym->name, name, namelen);
239 void symbol__delete(struct symbol *sym)
241 free(((void *)sym) - symbol_conf.priv_size);
244 size_t symbol__fprintf(struct symbol *sym, FILE *fp)
246 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
247 sym->start, sym->end,
248 sym->binding == STB_GLOBAL ? 'g' :
249 sym->binding == STB_LOCAL ? 'l' : 'w',
253 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
254 const struct addr_location *al, FILE *fp)
256 unsigned long offset;
259 if (sym && sym->name) {
260 length = fprintf(fp, "%s", sym->name);
262 if (al->addr < sym->end)
263 offset = al->addr - sym->start;
265 offset = al->addr - al->map->start - sym->start;
266 length += fprintf(fp, "+0x%lx", offset);
270 return fprintf(fp, "[unknown]");
273 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
275 return symbol__fprintf_symname_offs(sym, NULL, fp);
278 void symbols__delete(struct rb_root *symbols)
281 struct rb_node *next = rb_first(symbols);
284 pos = rb_entry(next, struct symbol, rb_node);
285 next = rb_next(&pos->rb_node);
286 rb_erase(&pos->rb_node, symbols);
291 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
293 struct rb_node **p = &symbols->rb_node;
294 struct rb_node *parent = NULL;
295 const u64 ip = sym->start;
300 s = rb_entry(parent, struct symbol, rb_node);
306 rb_link_node(&sym->rb_node, parent, p);
307 rb_insert_color(&sym->rb_node, symbols);
310 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
317 n = symbols->rb_node;
320 struct symbol *s = rb_entry(n, struct symbol, rb_node);
324 else if (ip > s->end)
333 static struct symbol *symbols__first(struct rb_root *symbols)
335 struct rb_node *n = rb_first(symbols);
338 return rb_entry(n, struct symbol, rb_node);
343 struct symbol_name_rb_node {
344 struct rb_node rb_node;
348 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
350 struct rb_node **p = &symbols->rb_node;
351 struct rb_node *parent = NULL;
352 struct symbol_name_rb_node *symn, *s;
354 symn = container_of(sym, struct symbol_name_rb_node, sym);
358 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
359 if (strcmp(sym->name, s->sym.name) < 0)
364 rb_link_node(&symn->rb_node, parent, p);
365 rb_insert_color(&symn->rb_node, symbols);
368 static void symbols__sort_by_name(struct rb_root *symbols,
369 struct rb_root *source)
373 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
374 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
375 symbols__insert_by_name(symbols, pos);
379 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
387 n = symbols->rb_node;
390 struct symbol_name_rb_node *s;
393 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
394 cmp = strcmp(name, s->sym.name);
407 struct symbol *dso__find_symbol(struct dso *dso,
408 enum map_type type, u64 addr)
410 return symbols__find(&dso->symbols[type], addr);
413 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
415 return symbols__first(&dso->symbols[type]);
418 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
421 return symbols__find_by_name(&dso->symbol_names[type], name);
424 void dso__sort_by_name(struct dso *dso, enum map_type type)
426 dso__set_sorted_by_name(dso, type);
427 return symbols__sort_by_name(&dso->symbol_names[type],
428 &dso->symbols[type]);
431 size_t dso__fprintf_symbols_by_name(struct dso *dso,
432 enum map_type type, FILE *fp)
436 struct symbol_name_rb_node *pos;
438 for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
439 pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
440 fprintf(fp, "%s\n", pos->sym.name);
446 int modules__parse(const char *filename, void *arg,
447 int (*process_module)(void *arg, const char *name,
455 file = fopen(filename, "r");
465 line_len = getline(&line, &n, file);
478 line[--line_len] = '\0'; /* \n */
480 sep = strrchr(line, 'x');
484 hex2u64(sep + 1, &start);
486 sep = strchr(line, ' ');
492 scnprintf(name, sizeof(name), "[%s]", line);
494 err = process_module(arg, name, start);
504 struct process_kallsyms_args {
509 bool symbol__is_idle(struct symbol *sym)
511 const char * const idle_symbols[] = {
519 "mwait_idle_with_hints",
521 "ppc64_runlatch_off",
522 "pseries_dedicated_idle_sleep",
531 for (i = 0; idle_symbols[i]; i++) {
532 if (!strcmp(idle_symbols[i], sym->name))
539 static int map__process_kallsym_symbol(void *arg, const char *name,
540 char type, u64 start)
543 struct process_kallsyms_args *a = arg;
544 struct rb_root *root = &a->dso->symbols[a->map->type];
546 if (!symbol_type__is_a(type, a->map->type))
550 * module symbols are not sorted so we add all
551 * symbols, setting length to 0, and rely on
552 * symbols__fixup_end() to fix it up.
554 sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
558 * We will pass the symbols to the filter later, in
559 * map__split_kallsyms, when we have split the maps per module
561 symbols__insert(root, sym);
567 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
568 * so that we can in the next step set the symbol ->end address and then
569 * call kernel_maps__split_kallsyms.
571 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
574 struct process_kallsyms_args args = { .map = map, .dso = dso, };
575 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
578 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
579 symbol_filter_t filter)
581 struct map_groups *kmaps = map__kmap(map)->kmaps;
582 struct map *curr_map;
584 int count = 0, moved = 0;
585 struct rb_root *root = &dso->symbols[map->type];
586 struct rb_node *next = rb_first(root);
591 pos = rb_entry(next, struct symbol, rb_node);
592 next = rb_next(&pos->rb_node);
594 module = strchr(pos->name, '\t');
598 curr_map = map_groups__find(kmaps, map->type, pos->start);
600 if (!curr_map || (filter && filter(curr_map, pos))) {
601 rb_erase(&pos->rb_node, root);
604 pos->start -= curr_map->start - curr_map->pgoff;
606 pos->end -= curr_map->start - curr_map->pgoff;
607 if (curr_map != map) {
608 rb_erase(&pos->rb_node, root);
610 &curr_map->dso->symbols[curr_map->type],
619 /* Symbols have been adjusted */
620 dso->adjust_symbols = 1;
622 return count + moved;
626 * Split the symbols into maps, making sure there are no overlaps, i.e. the
627 * kernel range is broken in several maps, named [kernel].N, as we don't have
628 * the original ELF section names vmlinux have.
630 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
631 symbol_filter_t filter)
633 struct map_groups *kmaps = map__kmap(map)->kmaps;
634 struct machine *machine = kmaps->machine;
635 struct map *curr_map = map;
637 int count = 0, moved = 0;
638 struct rb_root *root = &dso->symbols[map->type];
639 struct rb_node *next = rb_first(root);
640 int kernel_range = 0;
645 pos = rb_entry(next, struct symbol, rb_node);
646 next = rb_next(&pos->rb_node);
648 module = strchr(pos->name, '\t');
650 if (!symbol_conf.use_modules)
655 if (strcmp(curr_map->dso->short_name, module)) {
656 if (curr_map != map &&
657 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
658 machine__is_default_guest(machine)) {
660 * We assume all symbols of a module are
661 * continuous in * kallsyms, so curr_map
662 * points to a module and all its
663 * symbols are in its kmap. Mark it as
666 dso__set_loaded(curr_map->dso,
670 curr_map = map_groups__find_by_name(kmaps,
672 if (curr_map == NULL) {
673 pr_debug("%s/proc/{kallsyms,modules} "
674 "inconsistency while looking "
675 "for \"%s\" module!\n",
676 machine->root_dir, module);
681 if (curr_map->dso->loaded &&
682 !machine__is_default_guest(machine))
686 * So that we look just like we get from .ko files,
687 * i.e. not prelinked, relative to map->start.
689 pos->start = curr_map->map_ip(curr_map, pos->start);
690 pos->end = curr_map->map_ip(curr_map, pos->end);
691 } else if (curr_map != map) {
692 char dso_name[PATH_MAX];
696 /* Kernel was relocated at boot time */
706 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
707 snprintf(dso_name, sizeof(dso_name),
711 snprintf(dso_name, sizeof(dso_name),
715 ndso = dso__new(dso_name);
719 ndso->kernel = dso->kernel;
721 curr_map = map__new2(pos->start, ndso, map->type);
722 if (curr_map == NULL) {
727 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
728 map_groups__insert(kmaps, curr_map);
731 /* Kernel was relocated at boot time */
736 if (filter && filter(curr_map, pos)) {
737 discard_symbol: rb_erase(&pos->rb_node, root);
740 if (curr_map != map) {
741 rb_erase(&pos->rb_node, root);
742 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
749 if (curr_map != map &&
750 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
751 machine__is_default_guest(kmaps->machine)) {
752 dso__set_loaded(curr_map->dso, curr_map->type);
755 return count + moved;
758 bool symbol__restricted_filename(const char *filename,
759 const char *restricted_filename)
761 bool restricted = false;
763 if (symbol_conf.kptr_restrict) {
764 char *r = realpath(filename, NULL);
767 restricted = strcmp(r, restricted_filename) == 0;
777 struct rb_node rb_node;
782 static void add_module(struct module_info *mi, struct rb_root *modules)
784 struct rb_node **p = &modules->rb_node;
785 struct rb_node *parent = NULL;
786 struct module_info *m;
790 m = rb_entry(parent, struct module_info, rb_node);
791 if (strcmp(mi->name, m->name) < 0)
796 rb_link_node(&mi->rb_node, parent, p);
797 rb_insert_color(&mi->rb_node, modules);
800 static void delete_modules(struct rb_root *modules)
802 struct module_info *mi;
803 struct rb_node *next = rb_first(modules);
806 mi = rb_entry(next, struct module_info, rb_node);
807 next = rb_next(&mi->rb_node);
808 rb_erase(&mi->rb_node, modules);
814 static struct module_info *find_module(const char *name,
815 struct rb_root *modules)
817 struct rb_node *n = modules->rb_node;
820 struct module_info *m;
823 m = rb_entry(n, struct module_info, rb_node);
824 cmp = strcmp(name, m->name);
836 static int __read_proc_modules(void *arg, const char *name, u64 start)
838 struct rb_root *modules = arg;
839 struct module_info *mi;
841 mi = zalloc(sizeof(struct module_info));
845 mi->name = strdup(name);
853 add_module(mi, modules);
858 static int read_proc_modules(const char *filename, struct rb_root *modules)
860 if (symbol__restricted_filename(filename, "/proc/modules"))
863 if (modules__parse(filename, modules, __read_proc_modules)) {
864 delete_modules(modules);
871 int compare_proc_modules(const char *from, const char *to)
873 struct rb_root from_modules = RB_ROOT;
874 struct rb_root to_modules = RB_ROOT;
875 struct rb_node *from_node, *to_node;
876 struct module_info *from_m, *to_m;
879 if (read_proc_modules(from, &from_modules))
882 if (read_proc_modules(to, &to_modules))
883 goto out_delete_from;
885 from_node = rb_first(&from_modules);
886 to_node = rb_first(&to_modules);
891 from_m = rb_entry(from_node, struct module_info, rb_node);
892 to_m = rb_entry(to_node, struct module_info, rb_node);
894 if (from_m->start != to_m->start ||
895 strcmp(from_m->name, to_m->name))
898 from_node = rb_next(from_node);
899 to_node = rb_next(to_node);
902 if (!from_node && !to_node)
905 delete_modules(&to_modules);
907 delete_modules(&from_modules);
912 static int do_validate_kcore_modules(const char *filename, struct map *map,
913 struct map_groups *kmaps)
915 struct rb_root modules = RB_ROOT;
919 err = read_proc_modules(filename, &modules);
923 old_map = map_groups__first(kmaps, map->type);
925 struct map *next = map_groups__next(old_map);
926 struct module_info *mi;
928 if (old_map == map || old_map->start == map->start) {
934 /* Module must be in memory at the same address */
935 mi = find_module(old_map->dso->short_name, &modules);
936 if (!mi || mi->start != old_map->start) {
944 delete_modules(&modules);
949 * If kallsyms is referenced by name then we look for filename in the same
952 static bool filename_from_kallsyms_filename(char *filename,
953 const char *base_name,
954 const char *kallsyms_filename)
958 strcpy(filename, kallsyms_filename);
959 name = strrchr(filename, '/');
965 if (!strcmp(name, "kallsyms")) {
966 strcpy(name, base_name);
973 static int validate_kcore_modules(const char *kallsyms_filename,
976 struct map_groups *kmaps = map__kmap(map)->kmaps;
977 char modules_filename[PATH_MAX];
979 if (!filename_from_kallsyms_filename(modules_filename, "modules",
983 if (do_validate_kcore_modules(modules_filename, map, kmaps))
989 static int validate_kcore_addresses(const char *kallsyms_filename,
992 struct kmap *kmap = map__kmap(map);
994 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
997 start = kallsyms__get_function_start(kallsyms_filename,
998 kmap->ref_reloc_sym->name);
999 if (start != kmap->ref_reloc_sym->addr)
1003 return validate_kcore_modules(kallsyms_filename, map);
1006 struct kcore_mapfn_data {
1009 struct list_head maps;
1012 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1014 struct kcore_mapfn_data *md = data;
1017 map = map__new2(start, md->dso, md->type);
1021 map->end = map->start + len;
1024 list_add(&map->node, &md->maps);
1029 static int dso__load_kcore(struct dso *dso, struct map *map,
1030 const char *kallsyms_filename)
1032 struct map_groups *kmaps = map__kmap(map)->kmaps;
1033 struct machine *machine = kmaps->machine;
1034 struct kcore_mapfn_data md;
1035 struct map *old_map, *new_map, *replacement_map = NULL;
1038 char kcore_filename[PATH_MAX];
1041 /* This function requires that the map is the kernel map */
1042 if (map != machine->vmlinux_maps[map->type])
1045 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1049 /* Modules and kernel must be present at their original addresses */
1050 if (validate_kcore_addresses(kallsyms_filename, map))
1054 md.type = map->type;
1055 INIT_LIST_HEAD(&md.maps);
1057 fd = open(kcore_filename, O_RDONLY);
1061 /* Read new maps into temporary lists */
1062 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1067 if (list_empty(&md.maps)) {
1072 /* Remove old maps */
1073 old_map = map_groups__first(kmaps, map->type);
1075 struct map *next = map_groups__next(old_map);
1078 map_groups__remove(kmaps, old_map);
1082 /* Find the kernel map using the first symbol */
1083 sym = dso__first_symbol(dso, map->type);
1084 list_for_each_entry(new_map, &md.maps, node) {
1085 if (sym && sym->start >= new_map->start &&
1086 sym->start < new_map->end) {
1087 replacement_map = new_map;
1092 if (!replacement_map)
1093 replacement_map = list_entry(md.maps.next, struct map, node);
1096 while (!list_empty(&md.maps)) {
1097 new_map = list_entry(md.maps.next, struct map, node);
1098 list_del(&new_map->node);
1099 if (new_map == replacement_map) {
1100 map->start = new_map->start;
1101 map->end = new_map->end;
1102 map->pgoff = new_map->pgoff;
1103 map->map_ip = new_map->map_ip;
1104 map->unmap_ip = new_map->unmap_ip;
1105 map__delete(new_map);
1106 /* Ensure maps are correctly ordered */
1107 map_groups__remove(kmaps, map);
1108 map_groups__insert(kmaps, map);
1110 map_groups__insert(kmaps, new_map);
1115 * Set the data type and long name so that kcore can be read via
1116 * dso__data_read_addr().
1118 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1119 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1121 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1122 dso__set_long_name(dso, strdup(kcore_filename), true);
1126 if (map->type == MAP__FUNCTION)
1127 pr_debug("Using %s for kernel object code\n", kcore_filename);
1129 pr_debug("Using %s for kernel data\n", kcore_filename);
1134 while (!list_empty(&md.maps)) {
1135 map = list_entry(md.maps.next, struct map, node);
1136 list_del(&map->node);
1144 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1145 * delta based on the relocation reference symbol.
1147 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1149 struct kmap *kmap = map__kmap(map);
1152 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1155 addr = kallsyms__get_function_start(filename,
1156 kmap->ref_reloc_sym->name);
1160 *delta = addr - kmap->ref_reloc_sym->addr;
1164 int dso__load_kallsyms(struct dso *dso, const char *filename,
1165 struct map *map, symbol_filter_t filter)
1169 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1172 if (dso__load_all_kallsyms(dso, filename, map) < 0)
1175 if (kallsyms__delta(map, filename, &delta))
1178 symbols__fixup_duplicate(&dso->symbols[map->type]);
1179 symbols__fixup_end(&dso->symbols[map->type]);
1181 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1182 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1184 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1186 if (!dso__load_kcore(dso, map, filename))
1187 return dso__split_kallsyms_for_kcore(dso, map, filter);
1189 return dso__split_kallsyms(dso, map, delta, filter);
1192 static int dso__load_perf_map(struct dso *dso, struct map *map,
1193 symbol_filter_t filter)
1200 file = fopen(dso->long_name, "r");
1204 while (!feof(file)) {
1209 line_len = getline(&line, &n, file);
1216 line[--line_len] = '\0'; /* \n */
1218 len = hex2u64(line, &start);
1221 if (len + 2 >= line_len)
1224 len += hex2u64(line + len, &size);
1227 if (len + 2 >= line_len)
1230 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1233 goto out_delete_line;
1235 if (filter && filter(map, sym))
1236 symbol__delete(sym);
1238 symbols__insert(&dso->symbols[map->type], sym);
1254 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1259 struct machine *machine;
1260 char *root_dir = (char *) "";
1262 struct symsrc ss_[2];
1263 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1265 dso__set_loaded(dso, map->type);
1267 if (dso->kernel == DSO_TYPE_KERNEL)
1268 return dso__load_kernel_sym(dso, map, filter);
1269 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1270 return dso__load_guest_kernel_sym(dso, map, filter);
1272 if (map->groups && map->groups->machine)
1273 machine = map->groups->machine;
1277 dso->adjust_symbols = 0;
1279 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1282 if (lstat(dso->name, &st) < 0)
1285 if (st.st_uid && (st.st_uid != geteuid())) {
1286 pr_warning("File %s not owned by current user or root, "
1287 "ignoring it.\n", dso->name);
1291 ret = dso__load_perf_map(dso, map, filter);
1292 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1293 DSO_BINARY_TYPE__NOT_FOUND;
1298 root_dir = machine->root_dir;
1300 name = malloc(PATH_MAX);
1304 /* Iterate over candidate debug images.
1305 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1306 * and/or opd section) for processing.
1308 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1309 struct symsrc *ss = &ss_[ss_pos];
1310 bool next_slot = false;
1312 enum dso_binary_type symtab_type = binary_type_symtab[i];
1314 if (dso__read_binary_type_filename(dso, symtab_type,
1315 root_dir, name, PATH_MAX))
1318 /* Name is now the name of the next image to try */
1319 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1322 if (!syms_ss && symsrc__has_symtab(ss)) {
1325 if (!dso->symsrc_filename)
1326 dso->symsrc_filename = strdup(name);
1329 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1337 if (syms_ss && runtime_ss)
1340 symsrc__destroy(ss);
1345 if (!runtime_ss && !syms_ss)
1348 if (runtime_ss && !syms_ss) {
1349 syms_ss = runtime_ss;
1352 /* We'll have to hope for the best */
1353 if (!runtime_ss && syms_ss)
1354 runtime_ss = syms_ss;
1359 km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1360 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1361 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km);
1369 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1374 for (; ss_pos > 0; ss_pos--)
1375 symsrc__destroy(&ss_[ss_pos - 1]);
1378 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1383 struct map *map_groups__find_by_name(struct map_groups *mg,
1384 enum map_type type, const char *name)
1388 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1389 struct map *map = rb_entry(nd, struct map, rb_node);
1391 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1398 int dso__load_vmlinux(struct dso *dso, struct map *map,
1399 const char *vmlinux, bool vmlinux_allocated,
1400 symbol_filter_t filter)
1404 char symfs_vmlinux[PATH_MAX];
1405 enum dso_binary_type symtab_type;
1407 if (vmlinux[0] == '/')
1408 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1410 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1411 symbol_conf.symfs, vmlinux);
1413 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1414 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1416 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1418 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1421 err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1422 symsrc__destroy(&ss);
1425 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1426 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1428 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1429 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1430 dso__set_loaded(dso, map->type);
1431 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1437 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1438 symbol_filter_t filter)
1443 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1444 vmlinux_path__nr_entries + 1);
1446 filename = dso__build_id_filename(dso, NULL, 0);
1447 if (filename != NULL) {
1448 err = dso__load_vmlinux(dso, map, filename, true, filter);
1454 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1455 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1463 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1465 char kallsyms_filename[PATH_MAX];
1466 struct dirent *dent;
1478 if (dent->d_type != DT_DIR)
1480 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1481 "%s/%s/kallsyms", dir, dent->d_name);
1482 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1483 strlcpy(dir, kallsyms_filename, dir_sz);
1494 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1496 u8 host_build_id[BUILD_ID_SIZE];
1497 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1498 bool is_host = false;
1499 char path[PATH_MAX];
1501 if (!dso->has_build_id) {
1503 * Last resort, if we don't have a build-id and couldn't find
1504 * any vmlinux file, try the running kernel kallsyms table.
1509 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1510 sizeof(host_build_id)) == 0)
1511 is_host = dso__build_id_equal(dso, host_build_id);
1513 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1515 scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1518 /* Use /proc/kallsyms if possible */
1523 /* If no cached kcore go with /proc/kallsyms */
1530 * Do not check the build-id cache, until we know we cannot use
1533 fd = open("/proc/kcore", O_RDONLY);
1536 /* If module maps match go with /proc/kallsyms */
1537 if (!validate_kcore_addresses("/proc/kallsyms", map))
1541 /* Find kallsyms in build-id cache with kcore */
1542 if (!find_matching_kcore(map, path, sizeof(path)))
1543 return strdup(path);
1548 /* Find kallsyms in build-id cache with kcore */
1549 if (!find_matching_kcore(map, path, sizeof(path)))
1550 return strdup(path);
1552 scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1553 buildid_dir, sbuild_id);
1555 if (access(path, F_OK)) {
1556 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1561 return strdup(path);
1564 return strdup("/proc/kallsyms");
1567 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1568 symbol_filter_t filter)
1571 const char *kallsyms_filename = NULL;
1572 char *kallsyms_allocated_filename = NULL;
1574 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1575 * it and only it, reporting errors to the user if it cannot be used.
1577 * For instance, try to analyse an ARM perf.data file _without_ a
1578 * build-id, or if the user specifies the wrong path to the right
1579 * vmlinux file, obviously we can't fallback to another vmlinux (a
1580 * x86_86 one, on the machine where analysis is being performed, say),
1581 * or worse, /proc/kallsyms.
1583 * If the specified file _has_ a build-id and there is a build-id
1584 * section in the perf.data file, we will still do the expected
1585 * validation in dso__load_vmlinux and will bail out if they don't
1588 if (symbol_conf.kallsyms_name != NULL) {
1589 kallsyms_filename = symbol_conf.kallsyms_name;
1593 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1594 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1598 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1599 err = dso__load_vmlinux_path(dso, map, filter);
1604 /* do not try local files if a symfs was given */
1605 if (symbol_conf.symfs[0] != 0)
1608 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1609 if (!kallsyms_allocated_filename)
1612 kallsyms_filename = kallsyms_allocated_filename;
1615 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1617 pr_debug("Using %s for symbols\n", kallsyms_filename);
1618 free(kallsyms_allocated_filename);
1620 if (err > 0 && !dso__is_kcore(dso)) {
1621 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1622 map__fixup_start(map);
1623 map__fixup_end(map);
1629 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1630 symbol_filter_t filter)
1633 const char *kallsyms_filename = NULL;
1634 struct machine *machine;
1635 char path[PATH_MAX];
1638 pr_debug("Guest kernel map hasn't the point to groups\n");
1641 machine = map->groups->machine;
1643 if (machine__is_default_guest(machine)) {
1645 * if the user specified a vmlinux filename, use it and only
1646 * it, reporting errors to the user if it cannot be used.
1647 * Or use file guest_kallsyms inputted by user on commandline
1649 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1650 err = dso__load_vmlinux(dso, map,
1651 symbol_conf.default_guest_vmlinux_name,
1656 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1657 if (!kallsyms_filename)
1660 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1661 kallsyms_filename = path;
1664 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1666 pr_debug("Using %s for symbols\n", kallsyms_filename);
1667 if (err > 0 && !dso__is_kcore(dso)) {
1668 machine__mmap_name(machine, path, sizeof(path));
1669 dso__set_long_name(dso, strdup(path), true);
1670 map__fixup_start(map);
1671 map__fixup_end(map);
1677 static void vmlinux_path__exit(void)
1679 while (--vmlinux_path__nr_entries >= 0)
1680 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1682 zfree(&vmlinux_path);
1685 static int vmlinux_path__init(void)
1690 vmlinux_path = malloc(sizeof(char *) * 5);
1691 if (vmlinux_path == NULL)
1694 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1695 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1697 ++vmlinux_path__nr_entries;
1698 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1699 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1701 ++vmlinux_path__nr_entries;
1703 /* only try running kernel version if no symfs was given */
1704 if (symbol_conf.symfs[0] != 0)
1707 if (uname(&uts) < 0)
1710 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1711 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1712 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1714 ++vmlinux_path__nr_entries;
1715 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1716 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1717 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1719 ++vmlinux_path__nr_entries;
1720 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1722 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1723 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1725 ++vmlinux_path__nr_entries;
1730 vmlinux_path__exit();
1734 int setup_list(struct strlist **list, const char *list_str,
1735 const char *list_name)
1737 if (list_str == NULL)
1740 *list = strlist__new(true, list_str);
1742 pr_err("problems parsing %s list\n", list_name);
1748 static bool symbol__read_kptr_restrict(void)
1752 if (geteuid() != 0) {
1753 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1757 if (fgets(line, sizeof(line), fp) != NULL)
1758 value = atoi(line) != 0;
1767 int symbol__init(void)
1771 if (symbol_conf.initialized)
1774 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1778 if (symbol_conf.sort_by_name)
1779 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1780 sizeof(struct symbol));
1782 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
1785 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1786 pr_err("'.' is the only non valid --field-separator argument\n");
1790 if (setup_list(&symbol_conf.dso_list,
1791 symbol_conf.dso_list_str, "dso") < 0)
1794 if (setup_list(&symbol_conf.comm_list,
1795 symbol_conf.comm_list_str, "comm") < 0)
1796 goto out_free_dso_list;
1798 if (setup_list(&symbol_conf.sym_list,
1799 symbol_conf.sym_list_str, "symbol") < 0)
1800 goto out_free_comm_list;
1803 * A path to symbols of "/" is identical to ""
1804 * reset here for simplicity.
1806 symfs = realpath(symbol_conf.symfs, NULL);
1808 symfs = symbol_conf.symfs;
1809 if (strcmp(symfs, "/") == 0)
1810 symbol_conf.symfs = "";
1811 if (symfs != symbol_conf.symfs)
1812 free((void *)symfs);
1814 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1816 symbol_conf.initialized = true;
1820 strlist__delete(symbol_conf.comm_list);
1822 strlist__delete(symbol_conf.dso_list);
1826 void symbol__exit(void)
1828 if (!symbol_conf.initialized)
1830 strlist__delete(symbol_conf.sym_list);
1831 strlist__delete(symbol_conf.dso_list);
1832 strlist__delete(symbol_conf.comm_list);
1833 vmlinux_path__exit();
1834 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1835 symbol_conf.initialized = false;