23 #include <symbol/kallsyms.h>
24 #include <sys/utsname.h>
26 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
27 symbol_filter_t filter);
28 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
29 symbol_filter_t filter);
30 int vmlinux_path__nr_entries;
33 struct symbol_conf symbol_conf = {
35 .try_vmlinux_path = true,
38 .demangle_kernel = false,
39 .cumulate_callchain = true,
40 .show_hist_headers = true,
45 static enum dso_binary_type binary_type_symtab[] = {
46 DSO_BINARY_TYPE__KALLSYMS,
47 DSO_BINARY_TYPE__GUEST_KALLSYMS,
48 DSO_BINARY_TYPE__JAVA_JIT,
49 DSO_BINARY_TYPE__DEBUGLINK,
50 DSO_BINARY_TYPE__BUILD_ID_CACHE,
51 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
52 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
53 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
54 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
55 DSO_BINARY_TYPE__GUEST_KMODULE,
56 DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
57 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
58 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
59 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
60 DSO_BINARY_TYPE__NOT_FOUND,
63 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
65 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
67 symbol_type = toupper(symbol_type);
71 return symbol_type == 'T' || symbol_type == 'W';
73 return symbol_type == 'D';
79 static int prefix_underscores_count(const char *str)
81 const char *tail = str;
89 int __weak arch__choose_best_symbol(struct symbol *syma,
90 struct symbol *symb __maybe_unused)
92 /* Avoid "SyS" kernel syscall aliases */
93 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
95 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
101 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
107 /* Prefer a symbol with non zero length */
108 a = syma->end - syma->start;
109 b = symb->end - symb->start;
110 if ((b == 0) && (a > 0))
112 else if ((a == 0) && (b > 0))
115 /* Prefer a non weak symbol over a weak one */
116 a = syma->binding == STB_WEAK;
117 b = symb->binding == STB_WEAK;
123 /* Prefer a global symbol over a non global one */
124 a = syma->binding == STB_GLOBAL;
125 b = symb->binding == STB_GLOBAL;
131 /* Prefer a symbol with less underscores */
132 a = prefix_underscores_count(syma->name);
133 b = prefix_underscores_count(symb->name);
139 /* Choose the symbol with the longest name */
140 na = strlen(syma->name);
141 nb = strlen(symb->name);
147 return arch__choose_best_symbol(syma, symb);
150 void symbols__fixup_duplicate(struct rb_root *symbols)
153 struct symbol *curr, *next;
155 nd = rb_first(symbols);
158 curr = rb_entry(nd, struct symbol, rb_node);
160 nd = rb_next(&curr->rb_node);
161 next = rb_entry(nd, struct symbol, rb_node);
166 if (curr->start != next->start)
169 if (choose_best_symbol(curr, next) == SYMBOL_A) {
170 rb_erase(&next->rb_node, symbols);
171 symbol__delete(next);
174 nd = rb_next(&curr->rb_node);
175 rb_erase(&curr->rb_node, symbols);
176 symbol__delete(curr);
181 void symbols__fixup_end(struct rb_root *symbols)
183 struct rb_node *nd, *prevnd = rb_first(symbols);
184 struct symbol *curr, *prev;
189 curr = rb_entry(prevnd, struct symbol, rb_node);
191 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
193 curr = rb_entry(nd, struct symbol, rb_node);
195 if (prev->end == prev->start && prev->end != curr->start)
196 prev->end = curr->start;
200 if (curr->end == curr->start)
201 curr->end = roundup(curr->start, 4096);
204 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
206 struct maps *maps = &mg->maps[type];
207 struct map *next, *curr;
209 pthread_rwlock_wrlock(&maps->lock);
211 curr = maps__first(maps);
215 for (next = map__next(curr); next; next = map__next(curr)) {
216 curr->end = next->start;
221 * We still haven't the actual symbols, so guess the
222 * last map final address.
227 pthread_rwlock_unlock(&maps->lock);
230 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
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 : 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 void symbols__delete(struct rb_root *symbols)
261 struct rb_node *next = rb_first(symbols);
264 pos = rb_entry(next, struct symbol, rb_node);
265 next = rb_next(&pos->rb_node);
266 rb_erase(&pos->rb_node, symbols);
271 void symbols__insert(struct rb_root *symbols, struct symbol *sym)
273 struct rb_node **p = &symbols->rb_node;
274 struct rb_node *parent = NULL;
275 const u64 ip = sym->start;
280 s = rb_entry(parent, struct symbol, rb_node);
286 rb_link_node(&sym->rb_node, parent, p);
287 rb_insert_color(&sym->rb_node, symbols);
290 static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
297 n = symbols->rb_node;
300 struct symbol *s = rb_entry(n, struct symbol, rb_node);
304 else if (ip > s->end || (ip == s->end && ip != s->start))
313 static struct symbol *symbols__first(struct rb_root *symbols)
315 struct rb_node *n = rb_first(symbols);
318 return rb_entry(n, struct symbol, rb_node);
323 static struct symbol *symbols__next(struct symbol *sym)
325 struct rb_node *n = rb_next(&sym->rb_node);
328 return rb_entry(n, struct symbol, rb_node);
333 static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
335 struct rb_node **p = &symbols->rb_node;
336 struct rb_node *parent = NULL;
337 struct symbol_name_rb_node *symn, *s;
339 symn = container_of(sym, struct symbol_name_rb_node, sym);
343 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
344 if (strcmp(sym->name, s->sym.name) < 0)
349 rb_link_node(&symn->rb_node, parent, p);
350 rb_insert_color(&symn->rb_node, symbols);
353 static void symbols__sort_by_name(struct rb_root *symbols,
354 struct rb_root *source)
358 for (nd = rb_first(source); nd; nd = rb_next(nd)) {
359 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
360 symbols__insert_by_name(symbols, pos);
364 static struct symbol *symbols__find_by_name(struct rb_root *symbols,
368 struct symbol_name_rb_node *s = NULL;
373 n = symbols->rb_node;
378 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
379 cmp = arch__compare_symbol_names(name, s->sym.name);
392 /* return first symbol that has same name (if any) */
393 for (n = rb_prev(n); n; n = rb_prev(n)) {
394 struct symbol_name_rb_node *tmp;
396 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
397 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
406 void dso__reset_find_symbol_cache(struct dso *dso)
410 for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) {
411 dso->last_find_result[type].addr = 0;
412 dso->last_find_result[type].symbol = NULL;
416 void dso__insert_symbol(struct dso *dso, enum map_type type, struct symbol *sym)
418 symbols__insert(&dso->symbols[type], sym);
420 /* update the symbol cache if necessary */
421 if (dso->last_find_result[type].addr >= sym->start &&
422 (dso->last_find_result[type].addr < sym->end ||
423 sym->start == sym->end)) {
424 dso->last_find_result[type].symbol = sym;
428 struct symbol *dso__find_symbol(struct dso *dso,
429 enum map_type type, u64 addr)
431 if (dso->last_find_result[type].addr != addr) {
432 dso->last_find_result[type].addr = addr;
433 dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr);
436 return dso->last_find_result[type].symbol;
439 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
441 return symbols__first(&dso->symbols[type]);
444 struct symbol *dso__next_symbol(struct symbol *sym)
446 return symbols__next(sym);
449 struct symbol *symbol__next_by_name(struct symbol *sym)
451 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
452 struct rb_node *n = rb_next(&s->rb_node);
454 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
458 * Teturns first symbol that matched with @name.
460 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
463 return symbols__find_by_name(&dso->symbol_names[type], name);
466 void dso__sort_by_name(struct dso *dso, enum map_type type)
468 dso__set_sorted_by_name(dso, type);
469 return symbols__sort_by_name(&dso->symbol_names[type],
470 &dso->symbols[type]);
473 int modules__parse(const char *filename, void *arg,
474 int (*process_module)(void *arg, const char *name,
482 file = fopen(filename, "r");
492 line_len = getline(&line, &n, file);
505 line[--line_len] = '\0'; /* \n */
507 sep = strrchr(line, 'x');
511 hex2u64(sep + 1, &start);
513 sep = strchr(line, ' ');
519 scnprintf(name, sizeof(name), "[%s]", line);
521 err = process_module(arg, name, start);
531 struct process_kallsyms_args {
537 * These are symbols in the kernel image, so make sure that
538 * sym is from a kernel DSO.
540 bool symbol__is_idle(struct symbol *sym)
542 const char * const idle_symbols[] = {
551 "mwait_idle_with_hints",
553 "ppc64_runlatch_off",
554 "pseries_dedicated_idle_sleep",
563 for (i = 0; idle_symbols[i]; i++) {
564 if (!strcmp(idle_symbols[i], sym->name))
571 static int map__process_kallsym_symbol(void *arg, const char *name,
572 char type, u64 start)
575 struct process_kallsyms_args *a = arg;
576 struct rb_root *root = &a->dso->symbols[a->map->type];
578 if (!symbol_type__is_a(type, a->map->type))
582 * module symbols are not sorted so we add all
583 * symbols, setting length to 0, and rely on
584 * symbols__fixup_end() to fix it up.
586 sym = symbol__new(start, 0, kallsyms2elf_binding(type), name);
590 * We will pass the symbols to the filter later, in
591 * map__split_kallsyms, when we have split the maps per module
593 symbols__insert(root, sym);
599 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
600 * so that we can in the next step set the symbol ->end address and then
601 * call kernel_maps__split_kallsyms.
603 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
606 struct process_kallsyms_args args = { .map = map, .dso = dso, };
607 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
610 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
611 symbol_filter_t filter)
613 struct map_groups *kmaps = map__kmaps(map);
614 struct map *curr_map;
617 struct rb_root old_root = dso->symbols[map->type];
618 struct rb_root *root = &dso->symbols[map->type];
619 struct rb_node *next = rb_first(root);
629 pos = rb_entry(next, struct symbol, rb_node);
630 next = rb_next(&pos->rb_node);
632 rb_erase_init(&pos->rb_node, &old_root);
634 module = strchr(pos->name, '\t');
638 curr_map = map_groups__find(kmaps, map->type, pos->start);
640 if (!curr_map || (filter && filter(curr_map, pos))) {
645 pos->start -= curr_map->start - curr_map->pgoff;
647 pos->end -= curr_map->start - curr_map->pgoff;
648 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
652 /* Symbols have been adjusted */
653 dso->adjust_symbols = 1;
659 * Split the symbols into maps, making sure there are no overlaps, i.e. the
660 * kernel range is broken in several maps, named [kernel].N, as we don't have
661 * the original ELF section names vmlinux have.
663 static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
664 symbol_filter_t filter)
666 struct map_groups *kmaps = map__kmaps(map);
667 struct machine *machine;
668 struct map *curr_map = map;
670 int count = 0, moved = 0;
671 struct rb_root *root = &dso->symbols[map->type];
672 struct rb_node *next = rb_first(root);
673 int kernel_range = 0;
678 machine = kmaps->machine;
683 pos = rb_entry(next, struct symbol, rb_node);
684 next = rb_next(&pos->rb_node);
686 module = strchr(pos->name, '\t');
688 if (!symbol_conf.use_modules)
693 if (strcmp(curr_map->dso->short_name, module)) {
694 if (curr_map != map &&
695 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
696 machine__is_default_guest(machine)) {
698 * We assume all symbols of a module are
699 * continuous in * kallsyms, so curr_map
700 * points to a module and all its
701 * symbols are in its kmap. Mark it as
704 dso__set_loaded(curr_map->dso,
708 curr_map = map_groups__find_by_name(kmaps,
710 if (curr_map == NULL) {
711 pr_debug("%s/proc/{kallsyms,modules} "
712 "inconsistency while looking "
713 "for \"%s\" module!\n",
714 machine->root_dir, module);
719 if (curr_map->dso->loaded &&
720 !machine__is_default_guest(machine))
724 * So that we look just like we get from .ko files,
725 * i.e. not prelinked, relative to map->start.
727 pos->start = curr_map->map_ip(curr_map, pos->start);
728 pos->end = curr_map->map_ip(curr_map, pos->end);
729 } else if (curr_map != map) {
730 char dso_name[PATH_MAX];
734 /* Kernel was relocated at boot time */
744 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
745 snprintf(dso_name, sizeof(dso_name),
749 snprintf(dso_name, sizeof(dso_name),
753 ndso = dso__new(dso_name);
757 ndso->kernel = dso->kernel;
759 curr_map = map__new2(pos->start, ndso, map->type);
760 if (curr_map == NULL) {
765 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
766 map_groups__insert(kmaps, curr_map);
769 /* Kernel was relocated at boot time */
774 if (filter && filter(curr_map, pos)) {
775 discard_symbol: rb_erase(&pos->rb_node, root);
778 if (curr_map != map) {
779 rb_erase(&pos->rb_node, root);
780 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
787 if (curr_map != map &&
788 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
789 machine__is_default_guest(kmaps->machine)) {
790 dso__set_loaded(curr_map->dso, curr_map->type);
793 return count + moved;
796 bool symbol__restricted_filename(const char *filename,
797 const char *restricted_filename)
799 bool restricted = false;
801 if (symbol_conf.kptr_restrict) {
802 char *r = realpath(filename, NULL);
805 restricted = strcmp(r, restricted_filename) == 0;
815 struct rb_node rb_node;
820 static void add_module(struct module_info *mi, struct rb_root *modules)
822 struct rb_node **p = &modules->rb_node;
823 struct rb_node *parent = NULL;
824 struct module_info *m;
828 m = rb_entry(parent, struct module_info, rb_node);
829 if (strcmp(mi->name, m->name) < 0)
834 rb_link_node(&mi->rb_node, parent, p);
835 rb_insert_color(&mi->rb_node, modules);
838 static void delete_modules(struct rb_root *modules)
840 struct module_info *mi;
841 struct rb_node *next = rb_first(modules);
844 mi = rb_entry(next, struct module_info, rb_node);
845 next = rb_next(&mi->rb_node);
846 rb_erase(&mi->rb_node, modules);
852 static struct module_info *find_module(const char *name,
853 struct rb_root *modules)
855 struct rb_node *n = modules->rb_node;
858 struct module_info *m;
861 m = rb_entry(n, struct module_info, rb_node);
862 cmp = strcmp(name, m->name);
874 static int __read_proc_modules(void *arg, const char *name, u64 start)
876 struct rb_root *modules = arg;
877 struct module_info *mi;
879 mi = zalloc(sizeof(struct module_info));
883 mi->name = strdup(name);
891 add_module(mi, modules);
896 static int read_proc_modules(const char *filename, struct rb_root *modules)
898 if (symbol__restricted_filename(filename, "/proc/modules"))
901 if (modules__parse(filename, modules, __read_proc_modules)) {
902 delete_modules(modules);
909 int compare_proc_modules(const char *from, const char *to)
911 struct rb_root from_modules = RB_ROOT;
912 struct rb_root to_modules = RB_ROOT;
913 struct rb_node *from_node, *to_node;
914 struct module_info *from_m, *to_m;
917 if (read_proc_modules(from, &from_modules))
920 if (read_proc_modules(to, &to_modules))
921 goto out_delete_from;
923 from_node = rb_first(&from_modules);
924 to_node = rb_first(&to_modules);
929 from_m = rb_entry(from_node, struct module_info, rb_node);
930 to_m = rb_entry(to_node, struct module_info, rb_node);
932 if (from_m->start != to_m->start ||
933 strcmp(from_m->name, to_m->name))
936 from_node = rb_next(from_node);
937 to_node = rb_next(to_node);
940 if (!from_node && !to_node)
943 delete_modules(&to_modules);
945 delete_modules(&from_modules);
950 static int do_validate_kcore_modules(const char *filename, struct map *map,
951 struct map_groups *kmaps)
953 struct rb_root modules = RB_ROOT;
957 err = read_proc_modules(filename, &modules);
961 old_map = map_groups__first(kmaps, map->type);
963 struct map *next = map_groups__next(old_map);
964 struct module_info *mi;
966 if (old_map == map || old_map->start == map->start) {
972 /* Module must be in memory at the same address */
973 mi = find_module(old_map->dso->short_name, &modules);
974 if (!mi || mi->start != old_map->start) {
982 delete_modules(&modules);
987 * If kallsyms is referenced by name then we look for filename in the same
990 static bool filename_from_kallsyms_filename(char *filename,
991 const char *base_name,
992 const char *kallsyms_filename)
996 strcpy(filename, kallsyms_filename);
997 name = strrchr(filename, '/');
1003 if (!strcmp(name, "kallsyms")) {
1004 strcpy(name, base_name);
1011 static int validate_kcore_modules(const char *kallsyms_filename,
1014 struct map_groups *kmaps = map__kmaps(map);
1015 char modules_filename[PATH_MAX];
1020 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1024 if (do_validate_kcore_modules(modules_filename, map, kmaps))
1030 static int validate_kcore_addresses(const char *kallsyms_filename,
1033 struct kmap *kmap = map__kmap(map);
1038 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1041 start = kallsyms__get_function_start(kallsyms_filename,
1042 kmap->ref_reloc_sym->name);
1043 if (start != kmap->ref_reloc_sym->addr)
1047 return validate_kcore_modules(kallsyms_filename, map);
1050 struct kcore_mapfn_data {
1053 struct list_head maps;
1056 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1058 struct kcore_mapfn_data *md = data;
1061 map = map__new2(start, md->dso, md->type);
1065 map->end = map->start + len;
1068 list_add(&map->node, &md->maps);
1073 static int dso__load_kcore(struct dso *dso, struct map *map,
1074 const char *kallsyms_filename)
1076 struct map_groups *kmaps = map__kmaps(map);
1077 struct machine *machine;
1078 struct kcore_mapfn_data md;
1079 struct map *old_map, *new_map, *replacement_map = NULL;
1082 char kcore_filename[PATH_MAX];
1088 machine = kmaps->machine;
1090 /* This function requires that the map is the kernel map */
1091 if (map != machine->vmlinux_maps[map->type])
1094 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1098 /* Modules and kernel must be present at their original addresses */
1099 if (validate_kcore_addresses(kallsyms_filename, map))
1103 md.type = map->type;
1104 INIT_LIST_HEAD(&md.maps);
1106 fd = open(kcore_filename, O_RDONLY);
1108 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1113 /* Read new maps into temporary lists */
1114 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1118 dso->is_64_bit = is_64_bit;
1120 if (list_empty(&md.maps)) {
1125 /* Remove old maps */
1126 old_map = map_groups__first(kmaps, map->type);
1128 struct map *next = map_groups__next(old_map);
1131 map_groups__remove(kmaps, old_map);
1135 /* Find the kernel map using the first symbol */
1136 sym = dso__first_symbol(dso, map->type);
1137 list_for_each_entry(new_map, &md.maps, node) {
1138 if (sym && sym->start >= new_map->start &&
1139 sym->start < new_map->end) {
1140 replacement_map = new_map;
1145 if (!replacement_map)
1146 replacement_map = list_entry(md.maps.next, struct map, node);
1149 while (!list_empty(&md.maps)) {
1150 new_map = list_entry(md.maps.next, struct map, node);
1151 list_del_init(&new_map->node);
1152 if (new_map == replacement_map) {
1153 map->start = new_map->start;
1154 map->end = new_map->end;
1155 map->pgoff = new_map->pgoff;
1156 map->map_ip = new_map->map_ip;
1157 map->unmap_ip = new_map->unmap_ip;
1158 /* Ensure maps are correctly ordered */
1160 map_groups__remove(kmaps, map);
1161 map_groups__insert(kmaps, map);
1164 map_groups__insert(kmaps, new_map);
1171 * Set the data type and long name so that kcore can be read via
1172 * dso__data_read_addr().
1174 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1175 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1177 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1178 dso__set_long_name(dso, strdup(kcore_filename), true);
1182 if (map->type == MAP__FUNCTION)
1183 pr_debug("Using %s for kernel object code\n", kcore_filename);
1185 pr_debug("Using %s for kernel data\n", kcore_filename);
1190 while (!list_empty(&md.maps)) {
1191 map = list_entry(md.maps.next, struct map, node);
1192 list_del_init(&map->node);
1200 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1201 * delta based on the relocation reference symbol.
1203 static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1205 struct kmap *kmap = map__kmap(map);
1211 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1214 addr = kallsyms__get_function_start(filename,
1215 kmap->ref_reloc_sym->name);
1219 *delta = addr - kmap->ref_reloc_sym->addr;
1223 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1224 struct map *map, bool no_kcore, symbol_filter_t filter)
1228 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1231 if (dso__load_all_kallsyms(dso, filename, map) < 0)
1234 if (kallsyms__delta(map, filename, &delta))
1237 symbols__fixup_duplicate(&dso->symbols[map->type]);
1238 symbols__fixup_end(&dso->symbols[map->type]);
1240 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1241 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1243 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1245 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1246 return dso__split_kallsyms_for_kcore(dso, map, filter);
1248 return dso__split_kallsyms(dso, map, delta, filter);
1251 int dso__load_kallsyms(struct dso *dso, const char *filename,
1252 struct map *map, symbol_filter_t filter)
1254 return __dso__load_kallsyms(dso, filename, map, false, filter);
1257 static int dso__load_perf_map(struct dso *dso, struct map *map,
1258 symbol_filter_t filter)
1265 file = fopen(dso->long_name, "r");
1269 while (!feof(file)) {
1274 line_len = getline(&line, &n, file);
1281 line[--line_len] = '\0'; /* \n */
1283 len = hex2u64(line, &start);
1286 if (len + 2 >= line_len)
1289 len += hex2u64(line + len, &size);
1292 if (len + 2 >= line_len)
1295 sym = symbol__new(start, size, STB_GLOBAL, line + len);
1298 goto out_delete_line;
1300 if (filter && filter(map, sym))
1301 symbol__delete(sym);
1303 symbols__insert(&dso->symbols[map->type], sym);
1319 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1320 enum dso_binary_type type)
1323 case DSO_BINARY_TYPE__JAVA_JIT:
1324 case DSO_BINARY_TYPE__DEBUGLINK:
1325 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1326 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1327 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1328 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1329 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1330 return !kmod && dso->kernel == DSO_TYPE_USER;
1332 case DSO_BINARY_TYPE__KALLSYMS:
1333 case DSO_BINARY_TYPE__VMLINUX:
1334 case DSO_BINARY_TYPE__KCORE:
1335 return dso->kernel == DSO_TYPE_KERNEL;
1337 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1338 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1339 case DSO_BINARY_TYPE__GUEST_KCORE:
1340 return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1342 case DSO_BINARY_TYPE__GUEST_KMODULE:
1343 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1344 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1345 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1347 * kernel modules know their symtab type - it's set when
1348 * creating a module dso in machine__findnew_module_map().
1350 return kmod && dso->symtab_type == type;
1352 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1355 case DSO_BINARY_TYPE__NOT_FOUND:
1361 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
1366 struct machine *machine;
1367 char *root_dir = (char *) "";
1369 struct symsrc ss_[2];
1370 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1372 unsigned char build_id[BUILD_ID_SIZE];
1374 pthread_mutex_lock(&dso->lock);
1376 /* check again under the dso->lock */
1377 if (dso__loaded(dso, map->type)) {
1383 if (dso->kernel == DSO_TYPE_KERNEL)
1384 ret = dso__load_kernel_sym(dso, map, filter);
1385 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1386 ret = dso__load_guest_kernel_sym(dso, map, filter);
1391 if (map->groups && map->groups->machine)
1392 machine = map->groups->machine;
1396 dso->adjust_symbols = 0;
1398 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1401 if (lstat(dso->name, &st) < 0)
1404 if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
1405 pr_warning("File %s not owned by current user or root, "
1406 "ignoring it (use -f to override).\n", dso->name);
1410 ret = dso__load_perf_map(dso, map, filter);
1411 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1412 DSO_BINARY_TYPE__NOT_FOUND;
1417 root_dir = machine->root_dir;
1419 name = malloc(PATH_MAX);
1423 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1424 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1425 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1426 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1430 * Read the build id if possible. This is required for
1431 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1433 if (is_regular_file(name) &&
1434 filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0)
1435 dso__set_build_id(dso, build_id);
1438 * Iterate over candidate debug images.
1439 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1440 * and/or opd section) for processing.
1442 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1443 struct symsrc *ss = &ss_[ss_pos];
1444 bool next_slot = false;
1446 enum dso_binary_type symtab_type = binary_type_symtab[i];
1448 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1451 if (dso__read_binary_type_filename(dso, symtab_type,
1452 root_dir, name, PATH_MAX))
1455 if (!is_regular_file(name))
1458 /* Name is now the name of the next image to try */
1459 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1462 if (!syms_ss && symsrc__has_symtab(ss)) {
1465 if (!dso->symsrc_filename)
1466 dso->symsrc_filename = strdup(name);
1469 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1477 if (syms_ss && runtime_ss)
1480 symsrc__destroy(ss);
1485 if (!runtime_ss && !syms_ss)
1488 if (runtime_ss && !syms_ss) {
1489 syms_ss = runtime_ss;
1492 /* We'll have to hope for the best */
1493 if (!runtime_ss && syms_ss)
1494 runtime_ss = syms_ss;
1496 if (syms_ss && syms_ss->type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
1497 if (dso__build_id_is_kmod(dso, name, PATH_MAX))
1501 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1508 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1513 for (; ss_pos > 0; ss_pos--)
1514 symsrc__destroy(&ss_[ss_pos - 1]);
1517 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1520 dso__set_loaded(dso, map->type);
1521 pthread_mutex_unlock(&dso->lock);
1526 struct map *map_groups__find_by_name(struct map_groups *mg,
1527 enum map_type type, const char *name)
1529 struct maps *maps = &mg->maps[type];
1532 pthread_rwlock_rdlock(&maps->lock);
1534 for (map = maps__first(maps); map; map = map__next(map)) {
1535 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1542 pthread_rwlock_unlock(&maps->lock);
1546 int dso__load_vmlinux(struct dso *dso, struct map *map,
1547 const char *vmlinux, bool vmlinux_allocated,
1548 symbol_filter_t filter)
1552 char symfs_vmlinux[PATH_MAX];
1553 enum dso_binary_type symtab_type;
1555 if (vmlinux[0] == '/')
1556 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1558 symbol__join_symfs(symfs_vmlinux, vmlinux);
1560 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1561 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1563 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1565 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1568 err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1569 symsrc__destroy(&ss);
1572 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1573 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1575 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1576 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1577 dso__set_loaded(dso, map->type);
1578 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1584 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1585 symbol_filter_t filter)
1588 char *filename = NULL;
1590 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1591 vmlinux_path__nr_entries + 1);
1593 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1594 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
1599 if (!symbol_conf.ignore_vmlinux_buildid)
1600 filename = dso__build_id_filename(dso, NULL, 0);
1601 if (filename != NULL) {
1602 err = dso__load_vmlinux(dso, map, filename, true, filter);
1611 static bool visible_dir_filter(const char *name, struct dirent *d)
1613 if (d->d_type != DT_DIR)
1615 return lsdir_no_dot_filter(name, d);
1618 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1620 char kallsyms_filename[PATH_MAX];
1622 struct strlist *dirs;
1623 struct str_node *nd;
1625 dirs = lsdir(dir, visible_dir_filter);
1629 strlist__for_each(nd, dirs) {
1630 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1631 "%s/%s/kallsyms", dir, nd->s);
1632 if (!validate_kcore_addresses(kallsyms_filename, map)) {
1633 strlcpy(dir, kallsyms_filename, dir_sz);
1639 strlist__delete(dirs);
1644 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1646 u8 host_build_id[BUILD_ID_SIZE];
1647 char sbuild_id[SBUILD_ID_SIZE];
1648 bool is_host = false;
1649 char path[PATH_MAX];
1651 if (!dso->has_build_id) {
1653 * Last resort, if we don't have a build-id and couldn't find
1654 * any vmlinux file, try the running kernel kallsyms table.
1659 if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1660 sizeof(host_build_id)) == 0)
1661 is_host = dso__build_id_equal(dso, host_build_id);
1663 build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1665 scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1668 /* Use /proc/kallsyms if possible */
1673 /* If no cached kcore go with /proc/kallsyms */
1680 * Do not check the build-id cache, until we know we cannot use
1683 fd = open("/proc/kcore", O_RDONLY);
1686 /* If module maps match go with /proc/kallsyms */
1687 if (!validate_kcore_addresses("/proc/kallsyms", map))
1691 /* Find kallsyms in build-id cache with kcore */
1692 if (!find_matching_kcore(map, path, sizeof(path)))
1693 return strdup(path);
1698 /* Find kallsyms in build-id cache with kcore */
1699 if (!find_matching_kcore(map, path, sizeof(path)))
1700 return strdup(path);
1702 scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1703 buildid_dir, sbuild_id);
1705 if (access(path, F_OK)) {
1706 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1711 return strdup(path);
1714 return strdup("/proc/kallsyms");
1717 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1718 symbol_filter_t filter)
1721 const char *kallsyms_filename = NULL;
1722 char *kallsyms_allocated_filename = NULL;
1724 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1725 * it and only it, reporting errors to the user if it cannot be used.
1727 * For instance, try to analyse an ARM perf.data file _without_ a
1728 * build-id, or if the user specifies the wrong path to the right
1729 * vmlinux file, obviously we can't fallback to another vmlinux (a
1730 * x86_86 one, on the machine where analysis is being performed, say),
1731 * or worse, /proc/kallsyms.
1733 * If the specified file _has_ a build-id and there is a build-id
1734 * section in the perf.data file, we will still do the expected
1735 * validation in dso__load_vmlinux and will bail out if they don't
1738 if (symbol_conf.kallsyms_name != NULL) {
1739 kallsyms_filename = symbol_conf.kallsyms_name;
1743 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1744 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1748 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1749 err = dso__load_vmlinux_path(dso, map, filter);
1754 /* do not try local files if a symfs was given */
1755 if (symbol_conf.symfs[0] != 0)
1758 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1759 if (!kallsyms_allocated_filename)
1762 kallsyms_filename = kallsyms_allocated_filename;
1765 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1767 pr_debug("Using %s for symbols\n", kallsyms_filename);
1768 free(kallsyms_allocated_filename);
1770 if (err > 0 && !dso__is_kcore(dso)) {
1771 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1772 dso__set_long_name(dso, "[kernel.kallsyms]", false);
1773 map__fixup_start(map);
1774 map__fixup_end(map);
1780 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1781 symbol_filter_t filter)
1784 const char *kallsyms_filename = NULL;
1785 struct machine *machine;
1786 char path[PATH_MAX];
1789 pr_debug("Guest kernel map hasn't the point to groups\n");
1792 machine = map->groups->machine;
1794 if (machine__is_default_guest(machine)) {
1796 * if the user specified a vmlinux filename, use it and only
1797 * it, reporting errors to the user if it cannot be used.
1798 * Or use file guest_kallsyms inputted by user on commandline
1800 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1801 err = dso__load_vmlinux(dso, map,
1802 symbol_conf.default_guest_vmlinux_name,
1807 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1808 if (!kallsyms_filename)
1811 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1812 kallsyms_filename = path;
1815 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1817 pr_debug("Using %s for symbols\n", kallsyms_filename);
1818 if (err > 0 && !dso__is_kcore(dso)) {
1819 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1820 machine__mmap_name(machine, path, sizeof(path));
1821 dso__set_long_name(dso, strdup(path), true);
1822 map__fixup_start(map);
1823 map__fixup_end(map);
1829 static void vmlinux_path__exit(void)
1831 while (--vmlinux_path__nr_entries >= 0)
1832 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1833 vmlinux_path__nr_entries = 0;
1835 zfree(&vmlinux_path);
1838 static const char * const vmlinux_paths[] = {
1843 static const char * const vmlinux_paths_upd[] = {
1845 "/usr/lib/debug/boot/vmlinux-%s",
1846 "/lib/modules/%s/build/vmlinux",
1847 "/usr/lib/debug/lib/modules/%s/vmlinux",
1848 "/usr/lib/debug/boot/vmlinux-%s.debug"
1851 static int vmlinux_path__add(const char *new_entry)
1853 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
1854 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1856 ++vmlinux_path__nr_entries;
1861 static int vmlinux_path__init(struct perf_env *env)
1865 char *kernel_version;
1868 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
1869 ARRAY_SIZE(vmlinux_paths_upd)));
1870 if (vmlinux_path == NULL)
1873 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
1874 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
1877 /* only try kernel version if no symfs was given */
1878 if (symbol_conf.symfs[0] != 0)
1882 kernel_version = env->os_release;
1884 if (uname(&uts) < 0)
1887 kernel_version = uts.release;
1890 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
1891 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
1892 if (vmlinux_path__add(bf) < 0)
1899 vmlinux_path__exit();
1903 int setup_list(struct strlist **list, const char *list_str,
1904 const char *list_name)
1906 if (list_str == NULL)
1909 *list = strlist__new(list_str, NULL);
1911 pr_err("problems parsing %s list\n", list_name);
1915 symbol_conf.has_filter = true;
1919 int setup_intlist(struct intlist **list, const char *list_str,
1920 const char *list_name)
1922 if (list_str == NULL)
1925 *list = intlist__new(list_str);
1927 pr_err("problems parsing %s list\n", list_name);
1933 static bool symbol__read_kptr_restrict(void)
1937 if (geteuid() != 0) {
1938 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1942 if (fgets(line, sizeof(line), fp) != NULL)
1943 value = atoi(line) != 0;
1952 int symbol__init(struct perf_env *env)
1956 if (symbol_conf.initialized)
1959 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1963 if (symbol_conf.sort_by_name)
1964 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1965 sizeof(struct symbol));
1967 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
1970 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1971 pr_err("'.' is the only non valid --field-separator argument\n");
1975 if (setup_list(&symbol_conf.dso_list,
1976 symbol_conf.dso_list_str, "dso") < 0)
1979 if (setup_list(&symbol_conf.comm_list,
1980 symbol_conf.comm_list_str, "comm") < 0)
1981 goto out_free_dso_list;
1983 if (setup_intlist(&symbol_conf.pid_list,
1984 symbol_conf.pid_list_str, "pid") < 0)
1985 goto out_free_comm_list;
1987 if (setup_intlist(&symbol_conf.tid_list,
1988 symbol_conf.tid_list_str, "tid") < 0)
1989 goto out_free_pid_list;
1991 if (setup_list(&symbol_conf.sym_list,
1992 symbol_conf.sym_list_str, "symbol") < 0)
1993 goto out_free_tid_list;
1996 * A path to symbols of "/" is identical to ""
1997 * reset here for simplicity.
1999 symfs = realpath(symbol_conf.symfs, NULL);
2001 symfs = symbol_conf.symfs;
2002 if (strcmp(symfs, "/") == 0)
2003 symbol_conf.symfs = "";
2004 if (symfs != symbol_conf.symfs)
2005 free((void *)symfs);
2007 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2009 symbol_conf.initialized = true;
2013 intlist__delete(symbol_conf.tid_list);
2015 intlist__delete(symbol_conf.pid_list);
2017 strlist__delete(symbol_conf.comm_list);
2019 strlist__delete(symbol_conf.dso_list);
2023 void symbol__exit(void)
2025 if (!symbol_conf.initialized)
2027 strlist__delete(symbol_conf.sym_list);
2028 strlist__delete(symbol_conf.dso_list);
2029 strlist__delete(symbol_conf.comm_list);
2030 intlist__delete(symbol_conf.tid_list);
2031 intlist__delete(symbol_conf.pid_list);
2032 vmlinux_path__exit();
2033 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2034 symbol_conf.initialized = false;