21 #include <sys/utsname.h>
24 #define KSYM_NAME_LEN 256
27 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
28 symbol_filter_t filter);
29 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
30 symbol_filter_t filter);
31 int vmlinux_path__nr_entries;
34 struct symbol_conf symbol_conf = {
36 .try_vmlinux_path = true,
42 static enum dso_binary_type binary_type_symtab[] = {
43 DSO_BINARY_TYPE__KALLSYMS,
44 DSO_BINARY_TYPE__GUEST_KALLSYMS,
45 DSO_BINARY_TYPE__JAVA_JIT,
46 DSO_BINARY_TYPE__DEBUGLINK,
47 DSO_BINARY_TYPE__BUILD_ID_CACHE,
48 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
49 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
50 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
51 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
52 DSO_BINARY_TYPE__GUEST_KMODULE,
53 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
54 DSO_BINARY_TYPE__NOT_FOUND,
57 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
59 bool symbol_type__is_a(char symbol_type, enum map_type map_type)
61 symbol_type = toupper(symbol_type);
65 return symbol_type == 'T' || symbol_type == 'W';
67 return symbol_type == 'D';
73 static int prefix_underscores_count(const char *str)
75 const char *tail = str;
86 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
92 /* Prefer a symbol with non zero length */
93 a = syma->end - syma->start;
94 b = symb->end - symb->start;
95 if ((b == 0) && (a > 0))
97 else if ((a == 0) && (b > 0))
100 /* Prefer a non weak symbol over a weak one */
101 a = syma->binding == STB_WEAK;
102 b = symb->binding == STB_WEAK;
108 /* Prefer a global symbol over a non global one */
109 a = syma->binding == STB_GLOBAL;
110 b = symb->binding == STB_GLOBAL;
116 /* Prefer a symbol with less underscores */
117 a = prefix_underscores_count(syma->name);
118 b = prefix_underscores_count(symb->name);
124 /* Choose the symbol with the longest name */
125 na = strlen(syma->name);
126 nb = strlen(symb->name);
132 /* Avoid "SyS" kernel syscall aliases */
133 if (na >= 3 && !strncmp(syma->name, "SyS", 3))
135 if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
141 void symbols__fixup_duplicate(struct rb_root *symbols)
144 struct symbol *curr, *next;
146 nd = rb_first(symbols);
149 curr = rb_entry(nd, struct symbol, rb_node);
151 nd = rb_next(&curr->rb_node);
152 next = rb_entry(nd, struct symbol, rb_node);
157 if (curr->start != next->start)
160 if (choose_best_symbol(curr, next) == SYMBOL_A) {
161 rb_erase(&next->rb_node, symbols);
164 nd = rb_next(&curr->rb_node);
165 rb_erase(&curr->rb_node, symbols);
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 kallsyms__parse(const char *filename, void *arg,
447 int (*process_symbol)(void *arg, const char *name,
448 char type, u64 start))
453 FILE *file = fopen(filename, "r");
460 while (!feof(file)) {
466 line_len = getline(&line, &n, file);
467 if (line_len < 0 || !line)
470 line[--line_len] = '\0'; /* \n */
472 len = hex2u64(line, &start);
475 if (len + 2 >= line_len)
478 symbol_type = line[len];
480 symbol_name = line + len;
481 len = line_len - len;
483 if (len >= KSYM_NAME_LEN) {
488 err = process_symbol(arg, symbol_name,
502 struct process_kallsyms_args {
507 static u8 kallsyms2elf_type(char type)
512 return isupper(type) ? STB_GLOBAL : STB_LOCAL;
515 static int map__process_kallsym_symbol(void *arg, const char *name,
516 char type, u64 start)
519 struct process_kallsyms_args *a = arg;
520 struct rb_root *root = &a->dso->symbols[a->map->type];
522 if (!symbol_type__is_a(type, a->map->type))
526 * module symbols are not sorted so we add all
527 * symbols, setting length to 0, and rely on
528 * symbols__fixup_end() to fix it up.
530 sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
534 * We will pass the symbols to the filter later, in
535 * map__split_kallsyms, when we have split the maps per module
537 symbols__insert(root, sym);
543 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
544 * so that we can in the next step set the symbol ->end address and then
545 * call kernel_maps__split_kallsyms.
547 static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
550 struct process_kallsyms_args args = { .map = map, .dso = dso, };
551 return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
554 static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
555 symbol_filter_t filter)
557 struct map_groups *kmaps = map__kmap(map)->kmaps;
558 struct map *curr_map;
560 int count = 0, moved = 0;
561 struct rb_root *root = &dso->symbols[map->type];
562 struct rb_node *next = rb_first(root);
567 pos = rb_entry(next, struct symbol, rb_node);
568 next = rb_next(&pos->rb_node);
570 module = strchr(pos->name, '\t');
574 curr_map = map_groups__find(kmaps, map->type, pos->start);
576 if (!curr_map || (filter && filter(curr_map, pos))) {
577 rb_erase(&pos->rb_node, root);
580 pos->start -= curr_map->start - curr_map->pgoff;
582 pos->end -= curr_map->start - curr_map->pgoff;
583 if (curr_map != map) {
584 rb_erase(&pos->rb_node, root);
586 &curr_map->dso->symbols[curr_map->type],
595 /* Symbols have been adjusted */
596 dso->adjust_symbols = 1;
598 return count + moved;
602 * Split the symbols into maps, making sure there are no overlaps, i.e. the
603 * kernel range is broken in several maps, named [kernel].N, as we don't have
604 * the original ELF section names vmlinux have.
606 static int dso__split_kallsyms(struct dso *dso, struct map *map,
607 symbol_filter_t filter)
609 struct map_groups *kmaps = map__kmap(map)->kmaps;
610 struct machine *machine = kmaps->machine;
611 struct map *curr_map = map;
613 int count = 0, moved = 0;
614 struct rb_root *root = &dso->symbols[map->type];
615 struct rb_node *next = rb_first(root);
616 int kernel_range = 0;
621 pos = rb_entry(next, struct symbol, rb_node);
622 next = rb_next(&pos->rb_node);
624 module = strchr(pos->name, '\t');
626 if (!symbol_conf.use_modules)
631 if (strcmp(curr_map->dso->short_name, module)) {
632 if (curr_map != map &&
633 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
634 machine__is_default_guest(machine)) {
636 * We assume all symbols of a module are
637 * continuous in * kallsyms, so curr_map
638 * points to a module and all its
639 * symbols are in its kmap. Mark it as
642 dso__set_loaded(curr_map->dso,
646 curr_map = map_groups__find_by_name(kmaps,
648 if (curr_map == NULL) {
649 pr_debug("%s/proc/{kallsyms,modules} "
650 "inconsistency while looking "
651 "for \"%s\" module!\n",
652 machine->root_dir, module);
657 if (curr_map->dso->loaded &&
658 !machine__is_default_guest(machine))
662 * So that we look just like we get from .ko files,
663 * i.e. not prelinked, relative to map->start.
665 pos->start = curr_map->map_ip(curr_map, pos->start);
666 pos->end = curr_map->map_ip(curr_map, pos->end);
667 } else if (curr_map != map) {
668 char dso_name[PATH_MAX];
676 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
677 snprintf(dso_name, sizeof(dso_name),
681 snprintf(dso_name, sizeof(dso_name),
685 ndso = dso__new(dso_name);
689 ndso->kernel = dso->kernel;
691 curr_map = map__new2(pos->start, ndso, map->type);
692 if (curr_map == NULL) {
697 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
698 map_groups__insert(kmaps, curr_map);
702 if (filter && filter(curr_map, pos)) {
703 discard_symbol: rb_erase(&pos->rb_node, root);
706 if (curr_map != map) {
707 rb_erase(&pos->rb_node, root);
708 symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
715 if (curr_map != map &&
716 dso->kernel == DSO_TYPE_GUEST_KERNEL &&
717 machine__is_default_guest(kmaps->machine)) {
718 dso__set_loaded(curr_map->dso, curr_map->type);
721 return count + moved;
724 bool symbol__restricted_filename(const char *filename,
725 const char *restricted_filename)
727 bool restricted = false;
729 if (symbol_conf.kptr_restrict) {
730 char *r = realpath(filename, NULL);
733 restricted = strcmp(r, restricted_filename) == 0;
742 struct kcore_mapfn_data {
745 struct list_head maps;
748 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
750 struct kcore_mapfn_data *md = data;
753 map = map__new2(start, md->dso, md->type);
757 map->end = map->start + len;
760 list_add(&map->node, &md->maps);
766 * If kallsyms is referenced by name then we look for kcore in the same
769 static bool kcore_filename_from_kallsyms_filename(char *kcore_filename,
770 const char *kallsyms_filename)
774 strcpy(kcore_filename, kallsyms_filename);
775 name = strrchr(kcore_filename, '/');
779 if (!strcmp(name, "/kallsyms")) {
780 strcpy(name, "/kcore");
787 static int dso__load_kcore(struct dso *dso, struct map *map,
788 const char *kallsyms_filename)
790 struct map_groups *kmaps = map__kmap(map)->kmaps;
791 struct machine *machine = kmaps->machine;
792 struct kcore_mapfn_data md;
793 struct map *old_map, *new_map, *replacement_map = NULL;
796 char kcore_filename[PATH_MAX];
799 /* This function requires that the map is the kernel map */
800 if (map != machine->vmlinux_maps[map->type])
803 if (!kcore_filename_from_kallsyms_filename(kcore_filename,
809 INIT_LIST_HEAD(&md.maps);
811 fd = open(kcore_filename, O_RDONLY);
815 /* Read new maps into temporary lists */
816 err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
821 if (list_empty(&md.maps)) {
826 /* Remove old maps */
827 old_map = map_groups__first(kmaps, map->type);
829 struct map *next = map_groups__next(old_map);
832 map_groups__remove(kmaps, old_map);
836 /* Find the kernel map using the first symbol */
837 sym = dso__first_symbol(dso, map->type);
838 list_for_each_entry(new_map, &md.maps, node) {
839 if (sym && sym->start >= new_map->start &&
840 sym->start < new_map->end) {
841 replacement_map = new_map;
846 if (!replacement_map)
847 replacement_map = list_entry(md.maps.next, struct map, node);
850 while (!list_empty(&md.maps)) {
851 new_map = list_entry(md.maps.next, struct map, node);
852 list_del(&new_map->node);
853 if (new_map == replacement_map) {
854 map->start = new_map->start;
855 map->end = new_map->end;
856 map->pgoff = new_map->pgoff;
857 map->map_ip = new_map->map_ip;
858 map->unmap_ip = new_map->unmap_ip;
859 map__delete(new_map);
860 /* Ensure maps are correctly ordered */
861 map_groups__remove(kmaps, map);
862 map_groups__insert(kmaps, map);
864 map_groups__insert(kmaps, new_map);
869 * Set the data type and long name so that kcore can be read via
870 * dso__data_read_addr().
872 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
873 dso->data_type = DSO_BINARY_TYPE__GUEST_KCORE;
875 dso->data_type = DSO_BINARY_TYPE__KCORE;
876 dso__set_long_name(dso, strdup(kcore_filename));
880 if (map->type == MAP__FUNCTION)
881 pr_debug("Using %s for kernel object code\n", kcore_filename);
883 pr_debug("Using %s for kernel data\n", kcore_filename);
888 while (!list_empty(&md.maps)) {
889 map = list_entry(md.maps.next, struct map, node);
890 list_del(&map->node);
897 int dso__load_kallsyms(struct dso *dso, const char *filename,
898 struct map *map, symbol_filter_t filter)
900 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
903 if (dso__load_all_kallsyms(dso, filename, map) < 0)
906 symbols__fixup_duplicate(&dso->symbols[map->type]);
907 symbols__fixup_end(&dso->symbols[map->type]);
909 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
910 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
912 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
914 if (!dso__load_kcore(dso, map, filename))
915 return dso__split_kallsyms_for_kcore(dso, map, filter);
917 return dso__split_kallsyms(dso, map, filter);
920 static int dso__load_perf_map(struct dso *dso, struct map *map,
921 symbol_filter_t filter)
928 file = fopen(dso->long_name, "r");
932 while (!feof(file)) {
937 line_len = getline(&line, &n, file);
944 line[--line_len] = '\0'; /* \n */
946 len = hex2u64(line, &start);
949 if (len + 2 >= line_len)
952 len += hex2u64(line + len, &size);
955 if (len + 2 >= line_len)
958 sym = symbol__new(start, size, STB_GLOBAL, line + len);
961 goto out_delete_line;
963 if (filter && filter(map, sym))
966 symbols__insert(&dso->symbols[map->type], sym);
982 int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
987 struct machine *machine;
988 char *root_dir = (char *) "";
990 struct symsrc ss_[2];
991 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
993 dso__set_loaded(dso, map->type);
995 if (dso->kernel == DSO_TYPE_KERNEL)
996 return dso__load_kernel_sym(dso, map, filter);
997 else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
998 return dso__load_guest_kernel_sym(dso, map, filter);
1000 if (map->groups && map->groups->machine)
1001 machine = map->groups->machine;
1005 dso->adjust_symbols = 0;
1007 if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1010 if (lstat(dso->name, &st) < 0)
1013 if (st.st_uid && (st.st_uid != geteuid())) {
1014 pr_warning("File %s not owned by current user or root, "
1015 "ignoring it.\n", dso->name);
1019 ret = dso__load_perf_map(dso, map, filter);
1020 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1021 DSO_BINARY_TYPE__NOT_FOUND;
1026 root_dir = machine->root_dir;
1028 name = malloc(PATH_MAX);
1032 /* Iterate over candidate debug images.
1033 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1034 * and/or opd section) for processing.
1036 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1037 struct symsrc *ss = &ss_[ss_pos];
1038 bool next_slot = false;
1040 enum dso_binary_type symtab_type = binary_type_symtab[i];
1042 if (dso__binary_type_file(dso, symtab_type,
1043 root_dir, name, PATH_MAX))
1046 /* Name is now the name of the next image to try */
1047 if (symsrc__init(ss, dso, name, symtab_type) < 0)
1050 if (!syms_ss && symsrc__has_symtab(ss)) {
1055 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1063 if (syms_ss && runtime_ss)
1069 if (!runtime_ss && !syms_ss)
1072 if (runtime_ss && !syms_ss) {
1073 syms_ss = runtime_ss;
1076 /* We'll have to hope for the best */
1077 if (!runtime_ss && syms_ss)
1078 runtime_ss = syms_ss;
1083 km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1084 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1085 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km);
1093 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1098 for (; ss_pos > 0; ss_pos--)
1099 symsrc__destroy(&ss_[ss_pos - 1]);
1102 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1107 struct map *map_groups__find_by_name(struct map_groups *mg,
1108 enum map_type type, const char *name)
1112 for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1113 struct map *map = rb_entry(nd, struct map, rb_node);
1115 if (map->dso && strcmp(map->dso->short_name, name) == 0)
1122 int dso__load_vmlinux(struct dso *dso, struct map *map,
1123 const char *vmlinux, symbol_filter_t filter)
1127 char symfs_vmlinux[PATH_MAX];
1128 enum dso_binary_type symtab_type;
1130 if (vmlinux[0] == '/')
1131 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1133 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1134 symbol_conf.symfs, vmlinux);
1136 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1137 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1139 symtab_type = DSO_BINARY_TYPE__VMLINUX;
1141 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1144 err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1145 symsrc__destroy(&ss);
1148 if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1149 dso->data_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1151 dso->data_type = DSO_BINARY_TYPE__VMLINUX;
1152 dso__set_long_name(dso, (char *)vmlinux);
1153 dso__set_loaded(dso, map->type);
1154 pr_debug("Using %s for symbols\n", symfs_vmlinux);
1160 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1161 symbol_filter_t filter)
1166 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1167 vmlinux_path__nr_entries + 1);
1169 filename = dso__build_id_filename(dso, NULL, 0);
1170 if (filename != NULL) {
1171 err = dso__load_vmlinux(dso, map, filename, filter);
1173 dso->lname_alloc = 1;
1179 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1180 err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
1182 dso__set_long_name(dso, strdup(vmlinux_path[i]));
1183 dso->lname_alloc = 1;
1191 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1192 symbol_filter_t filter)
1195 const char *kallsyms_filename = NULL;
1196 char *kallsyms_allocated_filename = NULL;
1198 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1199 * it and only it, reporting errors to the user if it cannot be used.
1201 * For instance, try to analyse an ARM perf.data file _without_ a
1202 * build-id, or if the user specifies the wrong path to the right
1203 * vmlinux file, obviously we can't fallback to another vmlinux (a
1204 * x86_86 one, on the machine where analysis is being performed, say),
1205 * or worse, /proc/kallsyms.
1207 * If the specified file _has_ a build-id and there is a build-id
1208 * section in the perf.data file, we will still do the expected
1209 * validation in dso__load_vmlinux and will bail out if they don't
1212 if (symbol_conf.kallsyms_name != NULL) {
1213 kallsyms_filename = symbol_conf.kallsyms_name;
1217 if (symbol_conf.vmlinux_name != NULL) {
1218 err = dso__load_vmlinux(dso, map,
1219 symbol_conf.vmlinux_name, filter);
1221 dso__set_long_name(dso,
1222 strdup(symbol_conf.vmlinux_name));
1223 dso->lname_alloc = 1;
1229 if (vmlinux_path != NULL) {
1230 err = dso__load_vmlinux_path(dso, map, filter);
1235 /* do not try local files if a symfs was given */
1236 if (symbol_conf.symfs[0] != 0)
1240 * Say the kernel DSO was created when processing the build-id header table,
1241 * we have a build-id, so check if it is the same as the running kernel,
1242 * using it if it is.
1244 if (dso->has_build_id) {
1245 u8 kallsyms_build_id[BUILD_ID_SIZE];
1246 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1248 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
1249 sizeof(kallsyms_build_id)) == 0) {
1250 if (dso__build_id_equal(dso, kallsyms_build_id)) {
1251 kallsyms_filename = "/proc/kallsyms";
1256 * Now look if we have it on the build-id cache in
1257 * $HOME/.debug/[kernel.kallsyms].
1259 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1262 if (asprintf(&kallsyms_allocated_filename,
1263 "%s/.debug/[kernel.kallsyms]/%s",
1264 getenv("HOME"), sbuild_id) == -1) {
1265 pr_err("Not enough memory for kallsyms file lookup\n");
1269 kallsyms_filename = kallsyms_allocated_filename;
1271 if (access(kallsyms_filename, F_OK)) {
1272 pr_err("No kallsyms or vmlinux with build-id %s "
1273 "was found\n", sbuild_id);
1274 free(kallsyms_allocated_filename);
1279 * Last resort, if we don't have a build-id and couldn't find
1280 * any vmlinux file, try the running kernel kallsyms table.
1282 kallsyms_filename = "/proc/kallsyms";
1286 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1288 pr_debug("Using %s for symbols\n", kallsyms_filename);
1289 free(kallsyms_allocated_filename);
1291 if (err > 0 && !dso__is_kcore(dso)) {
1292 dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
1293 map__fixup_start(map);
1294 map__fixup_end(map);
1300 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1301 symbol_filter_t filter)
1304 const char *kallsyms_filename = NULL;
1305 struct machine *machine;
1306 char path[PATH_MAX];
1309 pr_debug("Guest kernel map hasn't the point to groups\n");
1312 machine = map->groups->machine;
1314 if (machine__is_default_guest(machine)) {
1316 * if the user specified a vmlinux filename, use it and only
1317 * it, reporting errors to the user if it cannot be used.
1318 * Or use file guest_kallsyms inputted by user on commandline
1320 if (symbol_conf.default_guest_vmlinux_name != NULL) {
1321 err = dso__load_vmlinux(dso, map,
1322 symbol_conf.default_guest_vmlinux_name, filter);
1326 kallsyms_filename = symbol_conf.default_guest_kallsyms;
1327 if (!kallsyms_filename)
1330 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1331 kallsyms_filename = path;
1334 err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1336 pr_debug("Using %s for symbols\n", kallsyms_filename);
1337 if (err > 0 && !dso__is_kcore(dso)) {
1338 machine__mmap_name(machine, path, sizeof(path));
1339 dso__set_long_name(dso, strdup(path));
1340 map__fixup_start(map);
1341 map__fixup_end(map);
1347 static void vmlinux_path__exit(void)
1349 while (--vmlinux_path__nr_entries >= 0) {
1350 free(vmlinux_path[vmlinux_path__nr_entries]);
1351 vmlinux_path[vmlinux_path__nr_entries] = NULL;
1355 vmlinux_path = NULL;
1358 static int vmlinux_path__init(void)
1363 vmlinux_path = malloc(sizeof(char *) * 5);
1364 if (vmlinux_path == NULL)
1367 vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1368 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1370 ++vmlinux_path__nr_entries;
1371 vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1372 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1374 ++vmlinux_path__nr_entries;
1376 /* only try running kernel version if no symfs was given */
1377 if (symbol_conf.symfs[0] != 0)
1380 if (uname(&uts) < 0)
1383 snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1384 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1385 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1387 ++vmlinux_path__nr_entries;
1388 snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1389 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1390 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1392 ++vmlinux_path__nr_entries;
1393 snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1395 vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1396 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1398 ++vmlinux_path__nr_entries;
1403 vmlinux_path__exit();
1407 static int setup_list(struct strlist **list, const char *list_str,
1408 const char *list_name)
1410 if (list_str == NULL)
1413 *list = strlist__new(true, list_str);
1415 pr_err("problems parsing %s list\n", list_name);
1421 static bool symbol__read_kptr_restrict(void)
1425 if (geteuid() != 0) {
1426 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1430 if (fgets(line, sizeof(line), fp) != NULL)
1431 value = atoi(line) != 0;
1440 int symbol__init(void)
1444 if (symbol_conf.initialized)
1447 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1451 if (symbol_conf.sort_by_name)
1452 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1453 sizeof(struct symbol));
1455 if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
1458 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1459 pr_err("'.' is the only non valid --field-separator argument\n");
1463 if (setup_list(&symbol_conf.dso_list,
1464 symbol_conf.dso_list_str, "dso") < 0)
1467 if (setup_list(&symbol_conf.comm_list,
1468 symbol_conf.comm_list_str, "comm") < 0)
1469 goto out_free_dso_list;
1471 if (setup_list(&symbol_conf.sym_list,
1472 symbol_conf.sym_list_str, "symbol") < 0)
1473 goto out_free_comm_list;
1476 * A path to symbols of "/" is identical to ""
1477 * reset here for simplicity.
1479 symfs = realpath(symbol_conf.symfs, NULL);
1481 symfs = symbol_conf.symfs;
1482 if (strcmp(symfs, "/") == 0)
1483 symbol_conf.symfs = "";
1484 if (symfs != symbol_conf.symfs)
1485 free((void *)symfs);
1487 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1489 symbol_conf.initialized = true;
1493 strlist__delete(symbol_conf.comm_list);
1495 strlist__delete(symbol_conf.dso_list);
1499 void symbol__exit(void)
1501 if (!symbol_conf.initialized)
1503 strlist__delete(symbol_conf.sym_list);
1504 strlist__delete(symbol_conf.dso_list);
1505 strlist__delete(symbol_conf.comm_list);
1506 vmlinux_path__exit();
1507 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
1508 symbol_conf.initialized = false;