1 // SPDX-License-Identifier: GPL-2.0
7 #include <linux/capability.h>
8 #include <linux/kernel.h>
9 #include <linux/mman.h>
10 #include <linux/string.h>
11 #include <linux/time64.h>
12 #include <sys/types.h>
14 #include <sys/param.h>
22 #include "util.h" // lsdir()
28 #include "map_symbol.h"
29 #include "mem-events.h"
33 #include "namespaces.h"
36 #include <linux/ctype.h>
37 #include <linux/zalloc.h>
41 #include <symbol/kallsyms.h>
42 #include <sys/utsname.h>
44 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
45 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
46 static bool symbol__is_idle(const char *name);
48 int vmlinux_path__nr_entries;
51 struct symbol_conf symbol_conf = {
54 .try_vmlinux_path = true,
56 .demangle_kernel = false,
57 .cumulate_callchain = true,
58 .time_quantum = 100 * NSEC_PER_MSEC, /* 100ms */
59 .show_hist_headers = true,
66 static enum dso_binary_type binary_type_symtab[] = {
67 DSO_BINARY_TYPE__KALLSYMS,
68 DSO_BINARY_TYPE__GUEST_KALLSYMS,
69 DSO_BINARY_TYPE__JAVA_JIT,
70 DSO_BINARY_TYPE__DEBUGLINK,
71 DSO_BINARY_TYPE__BUILD_ID_CACHE,
72 DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
73 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
74 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
75 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
76 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
77 DSO_BINARY_TYPE__GUEST_KMODULE,
78 DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
79 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
80 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
81 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
82 DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
83 DSO_BINARY_TYPE__NOT_FOUND,
86 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
88 static bool symbol_type__filter(char symbol_type)
90 symbol_type = toupper(symbol_type);
91 return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
94 static int prefix_underscores_count(const char *str)
96 const char *tail = str;
104 void __weak arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
109 const char * __weak arch__normalize_symbol_name(const char *name)
114 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
116 return strcmp(namea, nameb);
119 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
122 return strncmp(namea, nameb, n);
125 int __weak arch__choose_best_symbol(struct symbol *syma,
126 struct symbol *symb __maybe_unused)
128 /* Avoid "SyS" kernel syscall aliases */
129 if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
131 if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
137 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
143 /* Prefer a symbol with non zero length */
144 a = syma->end - syma->start;
145 b = symb->end - symb->start;
146 if ((b == 0) && (a > 0))
148 else if ((a == 0) && (b > 0))
151 /* Prefer a non weak symbol over a weak one */
152 a = syma->binding == STB_WEAK;
153 b = symb->binding == STB_WEAK;
159 /* Prefer a global symbol over a non global one */
160 a = syma->binding == STB_GLOBAL;
161 b = symb->binding == STB_GLOBAL;
167 /* Prefer a symbol with less underscores */
168 a = prefix_underscores_count(syma->name);
169 b = prefix_underscores_count(symb->name);
175 /* Choose the symbol with the longest name */
176 na = strlen(syma->name);
177 nb = strlen(symb->name);
183 return arch__choose_best_symbol(syma, symb);
186 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
189 struct symbol *curr, *next;
191 if (symbol_conf.allow_aliases)
194 nd = rb_first_cached(symbols);
197 curr = rb_entry(nd, struct symbol, rb_node);
199 nd = rb_next(&curr->rb_node);
200 next = rb_entry(nd, struct symbol, rb_node);
205 if (curr->start != next->start)
208 if (choose_best_symbol(curr, next) == SYMBOL_A) {
209 rb_erase_cached(&next->rb_node, symbols);
210 symbol__delete(next);
213 nd = rb_next(&curr->rb_node);
214 rb_erase_cached(&curr->rb_node, symbols);
215 symbol__delete(curr);
220 void symbols__fixup_end(struct rb_root_cached *symbols)
222 struct rb_node *nd, *prevnd = rb_first_cached(symbols);
223 struct symbol *curr, *prev;
228 curr = rb_entry(prevnd, struct symbol, rb_node);
230 for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
232 curr = rb_entry(nd, struct symbol, rb_node);
234 if (prev->end == prev->start && prev->end != curr->start)
235 arch__symbols__fixup_end(prev, curr);
239 if (curr->end == curr->start)
240 curr->end = roundup(curr->start, 4096) + 4096;
243 void maps__fixup_end(struct maps *maps)
245 struct map *prev = NULL, *curr;
247 down_write(&maps->lock);
249 maps__for_each_entry(maps, curr) {
250 if (prev != NULL && !prev->end)
251 prev->end = curr->start;
257 * We still haven't the actual symbols, so guess the
258 * last map final address.
260 if (curr && !curr->end)
263 up_write(&maps->lock);
266 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
268 size_t namelen = strlen(name) + 1;
269 struct symbol *sym = calloc(1, (symbol_conf.priv_size +
270 sizeof(*sym) + namelen));
274 if (symbol_conf.priv_size) {
275 if (symbol_conf.init_annotation) {
276 struct annotation *notes = (void *)sym;
277 pthread_mutex_init(¬es->lock, NULL);
279 sym = ((void *)sym) + symbol_conf.priv_size;
283 sym->end = len ? start + len : start;
285 sym->binding = binding;
286 sym->namelen = namelen - 1;
288 pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
289 __func__, name, start, sym->end);
290 memcpy(sym->name, name, namelen);
295 void symbol__delete(struct symbol *sym)
297 free(((void *)sym) - symbol_conf.priv_size);
300 void symbols__delete(struct rb_root_cached *symbols)
303 struct rb_node *next = rb_first_cached(symbols);
306 pos = rb_entry(next, struct symbol, rb_node);
307 next = rb_next(&pos->rb_node);
308 rb_erase_cached(&pos->rb_node, symbols);
313 void __symbols__insert(struct rb_root_cached *symbols,
314 struct symbol *sym, bool kernel)
316 struct rb_node **p = &symbols->rb_root.rb_node;
317 struct rb_node *parent = NULL;
318 const u64 ip = sym->start;
320 bool leftmost = true;
323 const char *name = sym->name;
325 * ppc64 uses function descriptors and appends a '.' to the
326 * start of every instruction address. Remove it.
330 sym->idle = symbol__is_idle(name);
335 s = rb_entry(parent, struct symbol, rb_node);
343 rb_link_node(&sym->rb_node, parent, p);
344 rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
347 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
349 __symbols__insert(symbols, sym, false);
352 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
359 n = symbols->rb_root.rb_node;
362 struct symbol *s = rb_entry(n, struct symbol, rb_node);
366 else if (ip > s->end || (ip == s->end && ip != s->start))
375 static struct symbol *symbols__first(struct rb_root_cached *symbols)
377 struct rb_node *n = rb_first_cached(symbols);
380 return rb_entry(n, struct symbol, rb_node);
385 static struct symbol *symbols__last(struct rb_root_cached *symbols)
387 struct rb_node *n = rb_last(&symbols->rb_root);
390 return rb_entry(n, struct symbol, rb_node);
395 static struct symbol *symbols__next(struct symbol *sym)
397 struct rb_node *n = rb_next(&sym->rb_node);
400 return rb_entry(n, struct symbol, rb_node);
405 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
407 struct rb_node **p = &symbols->rb_root.rb_node;
408 struct rb_node *parent = NULL;
409 struct symbol_name_rb_node *symn, *s;
410 bool leftmost = true;
412 symn = container_of(sym, struct symbol_name_rb_node, sym);
416 s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
417 if (strcmp(sym->name, s->sym.name) < 0)
424 rb_link_node(&symn->rb_node, parent, p);
425 rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
428 static void symbols__sort_by_name(struct rb_root_cached *symbols,
429 struct rb_root_cached *source)
433 for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
434 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
435 symbols__insert_by_name(symbols, pos);
439 int symbol__match_symbol_name(const char *name, const char *str,
440 enum symbol_tag_include includes)
442 const char *versioning;
444 if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
445 (versioning = strstr(name, "@@"))) {
446 int len = strlen(str);
448 if (len < versioning - name)
449 len = versioning - name;
451 return arch__compare_symbol_names_n(name, str, len);
453 return arch__compare_symbol_names(name, str);
456 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
458 enum symbol_tag_include includes)
461 struct symbol_name_rb_node *s = NULL;
466 n = symbols->rb_root.rb_node;
471 s = rb_entry(n, struct symbol_name_rb_node, rb_node);
472 cmp = symbol__match_symbol_name(s->sym.name, name, includes);
485 if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
486 /* return first symbol that has same name (if any) */
487 for (n = rb_prev(n); n; n = rb_prev(n)) {
488 struct symbol_name_rb_node *tmp;
490 tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
491 if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
500 void dso__reset_find_symbol_cache(struct dso *dso)
502 dso->last_find_result.addr = 0;
503 dso->last_find_result.symbol = NULL;
506 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
508 __symbols__insert(&dso->symbols, sym, dso->kernel);
510 /* update the symbol cache if necessary */
511 if (dso->last_find_result.addr >= sym->start &&
512 (dso->last_find_result.addr < sym->end ||
513 sym->start == sym->end)) {
514 dso->last_find_result.symbol = sym;
518 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
520 if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
521 dso->last_find_result.addr = addr;
522 dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
525 return dso->last_find_result.symbol;
528 struct symbol *dso__first_symbol(struct dso *dso)
530 return symbols__first(&dso->symbols);
533 struct symbol *dso__last_symbol(struct dso *dso)
535 return symbols__last(&dso->symbols);
538 struct symbol *dso__next_symbol(struct symbol *sym)
540 return symbols__next(sym);
543 struct symbol *symbol__next_by_name(struct symbol *sym)
545 struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
546 struct rb_node *n = rb_next(&s->rb_node);
548 return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
552 * Returns first symbol that matched with @name.
554 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
556 struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
557 SYMBOL_TAG_INCLUDE__NONE);
559 s = symbols__find_by_name(&dso->symbol_names, name,
560 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
564 void dso__sort_by_name(struct dso *dso)
566 dso__set_sorted_by_name(dso);
567 return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
571 * While we find nice hex chars, build a long_val.
572 * Return number of chars processed.
574 static int hex2u64(const char *ptr, u64 *long_val)
578 *long_val = strtoull(ptr, &p, 16);
584 int modules__parse(const char *filename, void *arg,
585 int (*process_module)(void *arg, const char *name,
586 u64 start, u64 size))
593 file = fopen(filename, "r");
603 line_len = getline(&line, &n, file);
616 line[--line_len] = '\0'; /* \n */
618 sep = strrchr(line, 'x');
622 hex2u64(sep + 1, &start);
624 sep = strchr(line, ' ');
630 scnprintf(name, sizeof(name), "[%s]", line);
632 size = strtoul(sep + 1, &endptr, 0);
633 if (*endptr != ' ' && *endptr != '\t')
636 err = process_module(arg, name, start, size);
647 * These are symbols in the kernel image, so make sure that
648 * sym is from a kernel DSO.
650 static bool symbol__is_idle(const char *name)
652 const char * const idle_symbols[] = {
653 "acpi_idle_do_entry",
654 "acpi_processor_ffh_cstate_enter",
665 "mwait_idle_with_hints",
666 "mwait_idle_with_hints.constprop.0",
668 "ppc64_runlatch_off",
669 "pseries_dedicated_idle_sleep",
675 static struct strlist *idle_symbols_list;
677 if (idle_symbols_list)
678 return strlist__has_entry(idle_symbols_list, name);
680 idle_symbols_list = strlist__new(NULL, NULL);
682 for (i = 0; idle_symbols[i]; i++)
683 strlist__add(idle_symbols_list, idle_symbols[i]);
685 return strlist__has_entry(idle_symbols_list, name);
688 static int map__process_kallsym_symbol(void *arg, const char *name,
689 char type, u64 start)
692 struct dso *dso = arg;
693 struct rb_root_cached *root = &dso->symbols;
695 if (!symbol_type__filter(type))
699 * module symbols are not sorted so we add all
700 * symbols, setting length to 0, and rely on
701 * symbols__fixup_end() to fix it up.
703 sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
707 * We will pass the symbols to the filter later, in
708 * map__split_kallsyms, when we have split the maps per module
710 __symbols__insert(root, sym, !strchr(name, '['));
716 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
717 * so that we can in the next step set the symbol ->end address and then
718 * call kernel_maps__split_kallsyms.
720 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
722 return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
725 static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
727 struct map *curr_map;
730 struct rb_root_cached old_root = dso->symbols;
731 struct rb_root_cached *root = &dso->symbols;
732 struct rb_node *next = rb_first_cached(root);
737 *root = RB_ROOT_CACHED;
742 pos = rb_entry(next, struct symbol, rb_node);
743 next = rb_next(&pos->rb_node);
745 rb_erase_cached(&pos->rb_node, &old_root);
746 RB_CLEAR_NODE(&pos->rb_node);
747 module = strchr(pos->name, '\t');
751 curr_map = maps__find(kmaps, pos->start);
758 pos->start -= curr_map->start - curr_map->pgoff;
759 if (pos->end > curr_map->end)
760 pos->end = curr_map->end;
762 pos->end -= curr_map->start - curr_map->pgoff;
763 symbols__insert(&curr_map->dso->symbols, pos);
767 /* Symbols have been adjusted */
768 dso->adjust_symbols = 1;
774 * Split the symbols into maps, making sure there are no overlaps, i.e. the
775 * kernel range is broken in several maps, named [kernel].N, as we don't have
776 * the original ELF section names vmlinux have.
778 static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
779 struct map *initial_map)
781 struct machine *machine;
782 struct map *curr_map = initial_map;
784 int count = 0, moved = 0;
785 struct rb_root_cached *root = &dso->symbols;
786 struct rb_node *next = rb_first_cached(root);
787 int kernel_range = 0;
793 machine = kmaps->machine;
795 x86_64 = machine__is(machine, "x86_64");
800 pos = rb_entry(next, struct symbol, rb_node);
801 next = rb_next(&pos->rb_node);
803 module = strchr(pos->name, '\t');
805 if (!symbol_conf.use_modules)
810 if (strcmp(curr_map->dso->short_name, module)) {
811 if (curr_map != initial_map &&
812 dso->kernel == DSO_SPACE__KERNEL_GUEST &&
813 machine__is_default_guest(machine)) {
815 * We assume all symbols of a module are
816 * continuous in * kallsyms, so curr_map
817 * points to a module and all its
818 * symbols are in its kmap. Mark it as
821 dso__set_loaded(curr_map->dso);
824 curr_map = maps__find_by_name(kmaps, module);
825 if (curr_map == NULL) {
826 pr_debug("%s/proc/{kallsyms,modules} "
827 "inconsistency while looking "
828 "for \"%s\" module!\n",
829 machine->root_dir, module);
830 curr_map = initial_map;
834 if (curr_map->dso->loaded &&
835 !machine__is_default_guest(machine))
839 * So that we look just like we get from .ko files,
840 * i.e. not prelinked, relative to initial_map->start.
842 pos->start = curr_map->map_ip(curr_map, pos->start);
843 pos->end = curr_map->map_ip(curr_map, pos->end);
844 } else if (x86_64 && is_entry_trampoline(pos->name)) {
846 * These symbols are not needed anymore since the
847 * trampoline maps refer to the text section and it's
848 * symbols instead. Avoid having to deal with
849 * relocations, and the assumption that the first symbol
850 * is the start of kernel text, by simply removing the
851 * symbols at this point.
854 } else if (curr_map != initial_map) {
855 char dso_name[PATH_MAX];
859 /* Kernel was relocated at boot time */
865 curr_map = initial_map;
869 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
870 snprintf(dso_name, sizeof(dso_name),
874 snprintf(dso_name, sizeof(dso_name),
878 ndso = dso__new(dso_name);
882 ndso->kernel = dso->kernel;
884 curr_map = map__new2(pos->start, ndso);
885 if (curr_map == NULL) {
890 curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
891 maps__insert(kmaps, curr_map);
894 /* Kernel was relocated at boot time */
899 if (curr_map != initial_map) {
900 rb_erase_cached(&pos->rb_node, root);
901 symbols__insert(&curr_map->dso->symbols, pos);
908 rb_erase_cached(&pos->rb_node, root);
912 if (curr_map != initial_map &&
913 dso->kernel == DSO_SPACE__KERNEL_GUEST &&
914 machine__is_default_guest(kmaps->machine)) {
915 dso__set_loaded(curr_map->dso);
918 return count + moved;
921 bool symbol__restricted_filename(const char *filename,
922 const char *restricted_filename)
924 bool restricted = false;
926 if (symbol_conf.kptr_restrict) {
927 char *r = realpath(filename, NULL);
930 restricted = strcmp(r, restricted_filename) == 0;
940 struct rb_node rb_node;
945 static void add_module(struct module_info *mi, struct rb_root *modules)
947 struct rb_node **p = &modules->rb_node;
948 struct rb_node *parent = NULL;
949 struct module_info *m;
953 m = rb_entry(parent, struct module_info, rb_node);
954 if (strcmp(mi->name, m->name) < 0)
959 rb_link_node(&mi->rb_node, parent, p);
960 rb_insert_color(&mi->rb_node, modules);
963 static void delete_modules(struct rb_root *modules)
965 struct module_info *mi;
966 struct rb_node *next = rb_first(modules);
969 mi = rb_entry(next, struct module_info, rb_node);
970 next = rb_next(&mi->rb_node);
971 rb_erase(&mi->rb_node, modules);
977 static struct module_info *find_module(const char *name,
978 struct rb_root *modules)
980 struct rb_node *n = modules->rb_node;
983 struct module_info *m;
986 m = rb_entry(n, struct module_info, rb_node);
987 cmp = strcmp(name, m->name);
999 static int __read_proc_modules(void *arg, const char *name, u64 start,
1000 u64 size __maybe_unused)
1002 struct rb_root *modules = arg;
1003 struct module_info *mi;
1005 mi = zalloc(sizeof(struct module_info));
1009 mi->name = strdup(name);
1017 add_module(mi, modules);
1022 static int read_proc_modules(const char *filename, struct rb_root *modules)
1024 if (symbol__restricted_filename(filename, "/proc/modules"))
1027 if (modules__parse(filename, modules, __read_proc_modules)) {
1028 delete_modules(modules);
1035 int compare_proc_modules(const char *from, const char *to)
1037 struct rb_root from_modules = RB_ROOT;
1038 struct rb_root to_modules = RB_ROOT;
1039 struct rb_node *from_node, *to_node;
1040 struct module_info *from_m, *to_m;
1043 if (read_proc_modules(from, &from_modules))
1046 if (read_proc_modules(to, &to_modules))
1047 goto out_delete_from;
1049 from_node = rb_first(&from_modules);
1050 to_node = rb_first(&to_modules);
1055 from_m = rb_entry(from_node, struct module_info, rb_node);
1056 to_m = rb_entry(to_node, struct module_info, rb_node);
1058 if (from_m->start != to_m->start ||
1059 strcmp(from_m->name, to_m->name))
1062 from_node = rb_next(from_node);
1063 to_node = rb_next(to_node);
1066 if (!from_node && !to_node)
1069 delete_modules(&to_modules);
1071 delete_modules(&from_modules);
1076 static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1078 struct rb_root modules = RB_ROOT;
1079 struct map *old_map;
1082 err = read_proc_modules(filename, &modules);
1086 maps__for_each_entry(kmaps, old_map) {
1087 struct module_info *mi;
1089 if (!__map__is_kmodule(old_map)) {
1093 /* Module must be in memory at the same address */
1094 mi = find_module(old_map->dso->short_name, &modules);
1095 if (!mi || mi->start != old_map->start) {
1101 delete_modules(&modules);
1106 * If kallsyms is referenced by name then we look for filename in the same
1109 static bool filename_from_kallsyms_filename(char *filename,
1110 const char *base_name,
1111 const char *kallsyms_filename)
1115 strcpy(filename, kallsyms_filename);
1116 name = strrchr(filename, '/');
1122 if (!strcmp(name, "kallsyms")) {
1123 strcpy(name, base_name);
1130 static int validate_kcore_modules(const char *kallsyms_filename,
1133 struct maps *kmaps = map__kmaps(map);
1134 char modules_filename[PATH_MAX];
1139 if (!filename_from_kallsyms_filename(modules_filename, "modules",
1143 if (do_validate_kcore_modules(modules_filename, kmaps))
1149 static int validate_kcore_addresses(const char *kallsyms_filename,
1152 struct kmap *kmap = map__kmap(map);
1157 if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1160 if (kallsyms__get_function_start(kallsyms_filename,
1161 kmap->ref_reloc_sym->name, &start))
1163 if (start != kmap->ref_reloc_sym->addr)
1167 return validate_kcore_modules(kallsyms_filename, map);
1170 struct kcore_mapfn_data {
1172 struct list_head maps;
1175 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1177 struct kcore_mapfn_data *md = data;
1180 map = map__new2(start, md->dso);
1184 map->end = map->start + len;
1187 list_add(&map->node, &md->maps);
1193 * Merges map into maps by splitting the new map within the existing map
1196 int maps__merge_in(struct maps *kmaps, struct map *new_map)
1198 struct map *old_map;
1201 maps__for_each_entry(kmaps, old_map) {
1202 /* no overload with this one */
1203 if (new_map->end < old_map->start ||
1204 new_map->start >= old_map->end)
1207 if (new_map->start < old_map->start) {
1212 if (new_map->end < old_map->end) {
1214 * |new......| -> |new..|
1215 * |old....| -> |old....|
1217 new_map->end = old_map->start;
1220 * |new.............| -> |new..| |new..|
1221 * |old....| -> |old....|
1223 struct map *m = map__clone(new_map);
1228 m->end = old_map->start;
1229 list_add_tail(&m->node, &merged);
1230 new_map->pgoff += old_map->end - new_map->start;
1231 new_map->start = old_map->end;
1238 if (new_map->end < old_map->end) {
1241 * |old.........| -> |old.........|
1248 * |new......| -> |new...|
1249 * |old....| -> |old....|
1251 new_map->pgoff += old_map->end - new_map->start;
1252 new_map->start = old_map->end;
1257 while (!list_empty(&merged)) {
1258 old_map = list_entry(merged.next, struct map, node);
1259 list_del_init(&old_map->node);
1260 maps__insert(kmaps, old_map);
1265 maps__insert(kmaps, new_map);
1271 static int dso__load_kcore(struct dso *dso, struct map *map,
1272 const char *kallsyms_filename)
1274 struct maps *kmaps = map__kmaps(map);
1275 struct kcore_mapfn_data md;
1276 struct map *old_map, *new_map, *replacement_map = NULL, *next;
1277 struct machine *machine;
1280 char kcore_filename[PATH_MAX];
1286 machine = kmaps->machine;
1288 /* This function requires that the map is the kernel map */
1289 if (!__map__is_kernel(map))
1292 if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1296 /* Modules and kernel must be present at their original addresses */
1297 if (validate_kcore_addresses(kallsyms_filename, map))
1301 INIT_LIST_HEAD(&md.maps);
1303 fd = open(kcore_filename, O_RDONLY);
1305 pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1310 /* Read new maps into temporary lists */
1311 err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1315 dso->is_64_bit = is_64_bit;
1317 if (list_empty(&md.maps)) {
1322 /* Remove old maps */
1323 maps__for_each_entry_safe(kmaps, old_map, next) {
1325 * We need to preserve eBPF maps even if they are
1326 * covered by kcore, because we need to access
1327 * eBPF dso for source data.
1329 if (old_map != map && !__map__is_bpf_prog(old_map))
1330 maps__remove(kmaps, old_map);
1332 machine->trampolines_mapped = false;
1334 /* Find the kernel map using the '_stext' symbol */
1335 if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1336 list_for_each_entry(new_map, &md.maps, node) {
1337 if (stext >= new_map->start && stext < new_map->end) {
1338 replacement_map = new_map;
1344 if (!replacement_map)
1345 replacement_map = list_entry(md.maps.next, struct map, node);
1348 while (!list_empty(&md.maps)) {
1349 new_map = list_entry(md.maps.next, struct map, node);
1350 list_del_init(&new_map->node);
1351 if (new_map == replacement_map) {
1352 map->start = new_map->start;
1353 map->end = new_map->end;
1354 map->pgoff = new_map->pgoff;
1355 map->map_ip = new_map->map_ip;
1356 map->unmap_ip = new_map->unmap_ip;
1357 /* Ensure maps are correctly ordered */
1359 maps__remove(kmaps, map);
1360 maps__insert(kmaps, map);
1365 * Merge kcore map into existing maps,
1366 * and ensure that current maps (eBPF)
1369 if (maps__merge_in(kmaps, new_map))
1374 if (machine__is(machine, "x86_64")) {
1378 * If one of the corresponding symbols is there, assume the
1379 * entry trampoline maps are too.
1381 if (!kallsyms__get_function_start(kallsyms_filename,
1382 ENTRY_TRAMPOLINE_NAME,
1384 machine->trampolines_mapped = true;
1388 * Set the data type and long name so that kcore can be read via
1389 * dso__data_read_addr().
1391 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1392 dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1394 dso->binary_type = DSO_BINARY_TYPE__KCORE;
1395 dso__set_long_name(dso, strdup(kcore_filename), true);
1399 if (map->prot & PROT_EXEC)
1400 pr_debug("Using %s for kernel object code\n", kcore_filename);
1402 pr_debug("Using %s for kernel data\n", kcore_filename);
1407 while (!list_empty(&md.maps)) {
1408 map = list_entry(md.maps.next, struct map, node);
1409 list_del_init(&map->node);
1417 * If the kernel is relocated at boot time, kallsyms won't match. Compute the
1418 * delta based on the relocation reference symbol.
1420 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1424 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1427 if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1430 *delta = addr - kmap->ref_reloc_sym->addr;
1434 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1435 struct map *map, bool no_kcore)
1437 struct kmap *kmap = map__kmap(map);
1440 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1443 if (!kmap || !kmap->kmaps)
1446 if (dso__load_all_kallsyms(dso, filename) < 0)
1449 if (kallsyms__delta(kmap, filename, &delta))
1452 symbols__fixup_end(&dso->symbols);
1453 symbols__fixup_duplicate(&dso->symbols);
1455 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1456 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1458 dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1460 if (!no_kcore && !dso__load_kcore(dso, map, filename))
1461 return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1463 return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1466 int dso__load_kallsyms(struct dso *dso, const char *filename,
1469 return __dso__load_kallsyms(dso, filename, map, false);
1472 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1479 file = fopen(map_path, "r");
1483 while (!feof(file)) {
1488 line_len = getline(&line, &n, file);
1495 line[--line_len] = '\0'; /* \n */
1497 len = hex2u64(line, &start);
1500 if (len + 2 >= line_len)
1503 len += hex2u64(line + len, &size);
1506 if (len + 2 >= line_len)
1509 sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1512 goto out_delete_line;
1514 symbols__insert(&dso->symbols, sym);
1529 #ifdef HAVE_LIBBFD_SUPPORT
1530 #define PACKAGE 'perf'
1533 static int bfd_symbols__cmpvalue(const void *a, const void *b)
1535 const asymbol *as = *(const asymbol **)a, *bs = *(const asymbol **)b;
1537 if (bfd_asymbol_value(as) != bfd_asymbol_value(bs))
1538 return bfd_asymbol_value(as) - bfd_asymbol_value(bs);
1540 return bfd_asymbol_name(as)[0] - bfd_asymbol_name(bs)[0];
1543 static int bfd2elf_binding(asymbol *symbol)
1545 if (symbol->flags & BSF_WEAK)
1547 if (symbol->flags & BSF_GLOBAL)
1549 if (symbol->flags & BSF_LOCAL)
1554 int dso__load_bfd_symbols(struct dso *dso, const char *debugfile)
1557 long symbols_size, symbols_count;
1559 asymbol **symbols, *sym;
1560 struct symbol *symbol;
1565 abfd = bfd_openr(dso->long_name, NULL);
1569 if (!bfd_check_format(abfd, bfd_object)) {
1570 pr_debug2("%s: cannot read %s bfd file.\n", __func__,
1575 if (bfd_get_flavour(abfd) == bfd_target_elf_flavour)
1578 section = bfd_get_section_by_name(abfd, ".text");
1580 dso->text_offset = section->vma - section->filepos;
1584 abfd = bfd_openr(debugfile, NULL);
1588 if (!bfd_check_format(abfd, bfd_object)) {
1589 pr_debug2("%s: cannot read %s bfd file.\n", __func__,
1594 if (bfd_get_flavour(abfd) == bfd_target_elf_flavour)
1597 symbols_size = bfd_get_symtab_upper_bound(abfd);
1598 if (symbols_size == 0) {
1603 if (symbols_size < 0)
1606 symbols = malloc(symbols_size);
1610 symbols_count = bfd_canonicalize_symtab(abfd, symbols);
1611 if (symbols_count < 0)
1614 qsort(symbols, symbols_count, sizeof(asymbol *), bfd_symbols__cmpvalue);
1616 #ifdef bfd_get_section
1617 #define bfd_asymbol_section bfd_get_section
1619 for (i = 0; i < symbols_count; ++i) {
1621 section = bfd_asymbol_section(sym);
1622 if (bfd2elf_binding(sym) < 0)
1625 while (i + 1 < symbols_count &&
1626 bfd_asymbol_section(symbols[i + 1]) == section &&
1627 bfd2elf_binding(symbols[i + 1]) < 0)
1630 if (i + 1 < symbols_count &&
1631 bfd_asymbol_section(symbols[i + 1]) == section)
1632 len = symbols[i + 1]->value - sym->value;
1634 len = section->size - sym->value;
1636 start = bfd_asymbol_value(sym) - dso->text_offset;
1637 symbol = symbol__new(start, len, bfd2elf_binding(sym), STT_FUNC,
1638 bfd_asymbol_name(sym));
1642 symbols__insert(&dso->symbols, symbol);
1644 #ifdef bfd_get_section
1645 #undef bfd_asymbol_section
1648 symbols__fixup_end(&dso->symbols);
1649 symbols__fixup_duplicate(&dso->symbols);
1650 dso->adjust_symbols = 1;
1661 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1662 enum dso_binary_type type)
1665 case DSO_BINARY_TYPE__JAVA_JIT:
1666 case DSO_BINARY_TYPE__DEBUGLINK:
1667 case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1668 case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1669 case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1670 case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1671 case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1672 case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1673 return !kmod && dso->kernel == DSO_SPACE__USER;
1675 case DSO_BINARY_TYPE__KALLSYMS:
1676 case DSO_BINARY_TYPE__VMLINUX:
1677 case DSO_BINARY_TYPE__KCORE:
1678 return dso->kernel == DSO_SPACE__KERNEL;
1680 case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1681 case DSO_BINARY_TYPE__GUEST_VMLINUX:
1682 case DSO_BINARY_TYPE__GUEST_KCORE:
1683 return dso->kernel == DSO_SPACE__KERNEL_GUEST;
1685 case DSO_BINARY_TYPE__GUEST_KMODULE:
1686 case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1687 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1688 case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1690 * kernel modules know their symtab type - it's set when
1691 * creating a module dso in machine__addnew_module_map().
1693 return kmod && dso->symtab_type == type;
1695 case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1696 case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1699 case DSO_BINARY_TYPE__BPF_PROG_INFO:
1700 case DSO_BINARY_TYPE__BPF_IMAGE:
1701 case DSO_BINARY_TYPE__OOL:
1702 case DSO_BINARY_TYPE__NOT_FOUND:
1708 /* Checks for the existence of the perf-<pid>.map file in two different
1709 * locations. First, if the process is a separate mount namespace, check in
1710 * that namespace using the pid of the innermost pid namespace. If's not in a
1711 * namespace, or the file can't be found there, try in the mount namespace of
1712 * the tracing process using our view of its pid.
1714 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1715 struct nsinfo **nsip)
1717 struct nscookie nsc;
1719 struct nsinfo *nnsi;
1724 if (nsi->need_setns) {
1725 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1726 nsinfo__mountns_enter(nsi, &nsc);
1727 rc = access(filebuf, R_OK);
1728 nsinfo__mountns_exit(&nsc);
1733 nnsi = nsinfo__copy(nsi);
1737 nnsi->need_setns = false;
1738 snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1746 int dso__load(struct dso *dso, struct map *map)
1751 struct machine *machine = NULL;
1752 char *root_dir = (char *) "";
1754 struct symsrc ss_[2];
1755 struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1758 struct build_id bid;
1759 struct nscookie nsc;
1760 char newmapname[PATH_MAX];
1761 const char *map_path = dso->long_name;
1763 perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1765 if (dso->nsinfo && (dso__find_perf_map(newmapname,
1766 sizeof(newmapname), &dso->nsinfo) == 0)) {
1767 map_path = newmapname;
1771 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1772 pthread_mutex_lock(&dso->lock);
1774 /* check again under the dso->lock */
1775 if (dso__loaded(dso)) {
1780 kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1781 dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1782 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1783 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1785 if (dso->kernel && !kmod) {
1786 if (dso->kernel == DSO_SPACE__KERNEL)
1787 ret = dso__load_kernel_sym(dso, map);
1788 else if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1789 ret = dso__load_guest_kernel_sym(dso, map);
1791 machine = map__kmaps(map)->machine;
1792 if (machine__is(machine, "x86_64"))
1793 machine__map_x86_64_entry_trampolines(machine, dso);
1797 dso->adjust_symbols = 0;
1800 ret = dso__load_perf_map(map_path, dso);
1801 dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1802 DSO_BINARY_TYPE__NOT_FOUND;
1807 root_dir = machine->root_dir;
1809 name = malloc(PATH_MAX);
1814 * Read the build id if possible. This is required for
1815 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1817 if (!dso->has_build_id &&
1818 is_regular_file(dso->long_name)) {
1819 __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1820 if (filename__read_build_id(name, &bid) > 0)
1821 dso__set_build_id(dso, &bid);
1825 * Iterate over candidate debug images.
1826 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1827 * and/or opd section) for processing.
1829 for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1830 struct symsrc *ss = &ss_[ss_pos];
1831 bool next_slot = false;
1837 enum dso_binary_type symtab_type = binary_type_symtab[i];
1839 nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1840 symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1842 if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1845 if (dso__read_binary_type_filename(dso, symtab_type,
1846 root_dir, name, PATH_MAX))
1850 nsinfo__mountns_exit(&nsc);
1852 is_reg = is_regular_file(name);
1853 #ifdef HAVE_LIBBFD_SUPPORT
1855 bfdrc = dso__load_bfd_symbols(dso, name);
1857 if (is_reg && bfdrc < 0)
1858 sirc = symsrc__init(ss, dso, name, symtab_type);
1861 nsinfo__mountns_enter(dso->nsinfo, &nsc);
1866 if (!is_reg || sirc < 0)
1869 if (!syms_ss && symsrc__has_symtab(ss)) {
1872 if (!dso->symsrc_filename)
1873 dso->symsrc_filename = strdup(name);
1876 if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1884 if (syms_ss && runtime_ss)
1887 symsrc__destroy(ss);
1892 if (!runtime_ss && !syms_ss)
1895 if (runtime_ss && !syms_ss) {
1896 syms_ss = runtime_ss;
1899 /* We'll have to hope for the best */
1900 if (!runtime_ss && syms_ss)
1901 runtime_ss = syms_ss;
1904 ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1911 nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1916 for (; ss_pos > 0; ss_pos--)
1917 symsrc__destroy(&ss_[ss_pos - 1]);
1920 if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1923 dso__set_loaded(dso);
1924 pthread_mutex_unlock(&dso->lock);
1925 nsinfo__mountns_exit(&nsc);
1930 static int map__strcmp(const void *a, const void *b)
1932 const struct map *ma = *(const struct map **)a, *mb = *(const struct map **)b;
1933 return strcmp(ma->dso->short_name, mb->dso->short_name);
1936 static int map__strcmp_name(const void *name, const void *b)
1938 const struct map *map = *(const struct map **)b;
1939 return strcmp(name, map->dso->short_name);
1942 void __maps__sort_by_name(struct maps *maps)
1944 qsort(maps->maps_by_name, maps->nr_maps, sizeof(struct map *), map__strcmp);
1947 static int map__groups__sort_by_name_from_rbtree(struct maps *maps)
1950 struct map **maps_by_name = realloc(maps->maps_by_name, maps->nr_maps * sizeof(map));
1953 if (maps_by_name == NULL)
1956 maps->maps_by_name = maps_by_name;
1957 maps->nr_maps_allocated = maps->nr_maps;
1959 maps__for_each_entry(maps, map)
1960 maps_by_name[i++] = map;
1962 __maps__sort_by_name(maps);
1966 static struct map *__maps__find_by_name(struct maps *maps, const char *name)
1970 if (maps->maps_by_name == NULL &&
1971 map__groups__sort_by_name_from_rbtree(maps))
1974 mapp = bsearch(name, maps->maps_by_name, maps->nr_maps, sizeof(*mapp), map__strcmp_name);
1980 struct map *maps__find_by_name(struct maps *maps, const char *name)
1984 down_read(&maps->lock);
1986 if (maps->last_search_by_name && strcmp(maps->last_search_by_name->dso->short_name, name) == 0) {
1987 map = maps->last_search_by_name;
1991 * If we have maps->maps_by_name, then the name isn't in the rbtree,
1992 * as maps->maps_by_name mirrors the rbtree when lookups by name are
1995 map = __maps__find_by_name(maps, name);
1996 if (map || maps->maps_by_name != NULL)
1999 /* Fallback to traversing the rbtree... */
2000 maps__for_each_entry(maps, map)
2001 if (strcmp(map->dso->short_name, name) == 0) {
2002 maps->last_search_by_name = map;
2009 up_read(&maps->lock);
2013 int dso__load_vmlinux(struct dso *dso, struct map *map,
2014 const char *vmlinux, bool vmlinux_allocated)
2018 char symfs_vmlinux[PATH_MAX];
2019 enum dso_binary_type symtab_type;
2021 if (vmlinux[0] == '/')
2022 snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
2024 symbol__join_symfs(symfs_vmlinux, vmlinux);
2026 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
2027 symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
2029 symtab_type = DSO_BINARY_TYPE__VMLINUX;
2031 if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
2034 err = dso__load_sym(dso, map, &ss, &ss, 0);
2035 symsrc__destroy(&ss);
2038 if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
2039 dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
2041 dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
2042 dso__set_long_name(dso, vmlinux, vmlinux_allocated);
2043 dso__set_loaded(dso);
2044 pr_debug("Using %s for symbols\n", symfs_vmlinux);
2050 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
2053 char *filename = NULL;
2055 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
2056 vmlinux_path__nr_entries + 1);
2058 for (i = 0; i < vmlinux_path__nr_entries; ++i) {
2059 err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
2064 if (!symbol_conf.ignore_vmlinux_buildid)
2065 filename = dso__build_id_filename(dso, NULL, 0, false);
2066 if (filename != NULL) {
2067 err = dso__load_vmlinux(dso, map, filename, true);
2076 static bool visible_dir_filter(const char *name, struct dirent *d)
2078 if (d->d_type != DT_DIR)
2080 return lsdir_no_dot_filter(name, d);
2083 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
2085 char kallsyms_filename[PATH_MAX];
2087 struct strlist *dirs;
2088 struct str_node *nd;
2090 dirs = lsdir(dir, visible_dir_filter);
2094 strlist__for_each_entry(nd, dirs) {
2095 scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
2096 "%s/%s/kallsyms", dir, nd->s);
2097 if (!validate_kcore_addresses(kallsyms_filename, map)) {
2098 strlcpy(dir, kallsyms_filename, dir_sz);
2104 strlist__delete(dirs);
2110 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
2111 * since access(R_OK) only checks with real UID/GID but open() use effective
2112 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
2114 static bool filename__readable(const char *file)
2116 int fd = open(file, O_RDONLY);
2123 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
2125 struct build_id bid;
2126 char sbuild_id[SBUILD_ID_SIZE];
2127 bool is_host = false;
2128 char path[PATH_MAX];
2130 if (!dso->has_build_id) {
2132 * Last resort, if we don't have a build-id and couldn't find
2133 * any vmlinux file, try the running kernel kallsyms table.
2138 if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0)
2139 is_host = dso__build_id_equal(dso, &bid);
2141 /* Try a fast path for /proc/kallsyms if possible */
2144 * Do not check the build-id cache, unless we know we cannot use
2145 * /proc/kcore or module maps don't match to /proc/kallsyms.
2146 * To check readability of /proc/kcore, do not use access(R_OK)
2147 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
2150 if (filename__readable("/proc/kcore") &&
2151 !validate_kcore_addresses("/proc/kallsyms", map))
2155 build_id__sprintf(&dso->bid, sbuild_id);
2157 /* Find kallsyms in build-id cache with kcore */
2158 scnprintf(path, sizeof(path), "%s/%s/%s",
2159 buildid_dir, DSO__NAME_KCORE, sbuild_id);
2161 if (!find_matching_kcore(map, path, sizeof(path)))
2162 return strdup(path);
2164 /* Use current /proc/kallsyms if possible */
2167 return strdup("/proc/kallsyms");
2170 /* Finally, find a cache of kallsyms */
2171 if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2172 pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2177 return strdup(path);
2180 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2183 const char *kallsyms_filename = NULL;
2184 char *kallsyms_allocated_filename = NULL;
2186 * Step 1: if the user specified a kallsyms or vmlinux filename, use
2187 * it and only it, reporting errors to the user if it cannot be used.
2189 * For instance, try to analyse an ARM perf.data file _without_ a
2190 * build-id, or if the user specifies the wrong path to the right
2191 * vmlinux file, obviously we can't fallback to another vmlinux (a
2192 * x86_86 one, on the machine where analysis is being performed, say),
2193 * or worse, /proc/kallsyms.
2195 * If the specified file _has_ a build-id and there is a build-id
2196 * section in the perf.data file, we will still do the expected
2197 * validation in dso__load_vmlinux and will bail out if they don't
2200 if (symbol_conf.kallsyms_name != NULL) {
2201 kallsyms_filename = symbol_conf.kallsyms_name;
2205 if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2206 return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2209 if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2210 err = dso__load_vmlinux_path(dso, map);
2215 /* do not try local files if a symfs was given */
2216 if (symbol_conf.symfs[0] != 0)
2219 kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2220 if (!kallsyms_allocated_filename)
2223 kallsyms_filename = kallsyms_allocated_filename;
2226 err = dso__load_kallsyms(dso, kallsyms_filename, map);
2228 pr_debug("Using %s for symbols\n", kallsyms_filename);
2229 free(kallsyms_allocated_filename);
2231 if (err > 0 && !dso__is_kcore(dso)) {
2232 dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2233 dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2234 map__fixup_start(map);
2235 map__fixup_end(map);
2241 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2244 const char *kallsyms_filename = NULL;
2245 struct machine *machine = map__kmaps(map)->machine;
2246 char path[PATH_MAX];
2248 if (machine__is_default_guest(machine)) {
2250 * if the user specified a vmlinux filename, use it and only
2251 * it, reporting errors to the user if it cannot be used.
2252 * Or use file guest_kallsyms inputted by user on commandline
2254 if (symbol_conf.default_guest_vmlinux_name != NULL) {
2255 err = dso__load_vmlinux(dso, map,
2256 symbol_conf.default_guest_vmlinux_name,
2261 kallsyms_filename = symbol_conf.default_guest_kallsyms;
2262 if (!kallsyms_filename)
2265 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2266 kallsyms_filename = path;
2269 err = dso__load_kallsyms(dso, kallsyms_filename, map);
2271 pr_debug("Using %s for symbols\n", kallsyms_filename);
2272 if (err > 0 && !dso__is_kcore(dso)) {
2273 dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2274 dso__set_long_name(dso, machine->mmap_name, false);
2275 map__fixup_start(map);
2276 map__fixup_end(map);
2282 static void vmlinux_path__exit(void)
2284 while (--vmlinux_path__nr_entries >= 0)
2285 zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2286 vmlinux_path__nr_entries = 0;
2288 zfree(&vmlinux_path);
2291 static const char * const vmlinux_paths[] = {
2296 static const char * const vmlinux_paths_upd[] = {
2298 "/usr/lib/debug/boot/vmlinux-%s",
2299 "/lib/modules/%s/build/vmlinux",
2300 "/usr/lib/debug/lib/modules/%s/vmlinux",
2301 "/usr/lib/debug/boot/vmlinux-%s.debug"
2304 static int vmlinux_path__add(const char *new_entry)
2306 vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2307 if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2309 ++vmlinux_path__nr_entries;
2314 static int vmlinux_path__init(struct perf_env *env)
2318 char *kernel_version;
2321 vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2322 ARRAY_SIZE(vmlinux_paths_upd)));
2323 if (vmlinux_path == NULL)
2326 for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2327 if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2330 /* only try kernel version if no symfs was given */
2331 if (symbol_conf.symfs[0] != 0)
2335 kernel_version = env->os_release;
2337 if (uname(&uts) < 0)
2340 kernel_version = uts.release;
2343 for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2344 snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2345 if (vmlinux_path__add(bf) < 0)
2352 vmlinux_path__exit();
2356 int setup_list(struct strlist **list, const char *list_str,
2357 const char *list_name)
2359 if (list_str == NULL)
2362 *list = strlist__new(list_str, NULL);
2364 pr_err("problems parsing %s list\n", list_name);
2368 symbol_conf.has_filter = true;
2372 int setup_intlist(struct intlist **list, const char *list_str,
2373 const char *list_name)
2375 if (list_str == NULL)
2378 *list = intlist__new(list_str);
2380 pr_err("problems parsing %s list\n", list_name);
2386 static bool symbol__read_kptr_restrict(void)
2389 FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2394 if (fgets(line, sizeof(line), fp) != NULL)
2395 value = perf_cap__capable(CAP_SYSLOG) ?
2402 /* Per kernel/kallsyms.c:
2403 * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2405 if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2411 int symbol__annotation_init(void)
2413 if (symbol_conf.init_annotation)
2416 if (symbol_conf.initialized) {
2417 pr_err("Annotation needs to be init before symbol__init()\n");
2421 symbol_conf.priv_size += sizeof(struct annotation);
2422 symbol_conf.init_annotation = true;
2426 int symbol__init(struct perf_env *env)
2430 if (symbol_conf.initialized)
2433 symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2437 if (symbol_conf.sort_by_name)
2438 symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2439 sizeof(struct symbol));
2441 if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2444 if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2445 pr_err("'.' is the only non valid --field-separator argument\n");
2449 if (setup_list(&symbol_conf.dso_list,
2450 symbol_conf.dso_list_str, "dso") < 0)
2453 if (setup_list(&symbol_conf.comm_list,
2454 symbol_conf.comm_list_str, "comm") < 0)
2455 goto out_free_dso_list;
2457 if (setup_intlist(&symbol_conf.pid_list,
2458 symbol_conf.pid_list_str, "pid") < 0)
2459 goto out_free_comm_list;
2461 if (setup_intlist(&symbol_conf.tid_list,
2462 symbol_conf.tid_list_str, "tid") < 0)
2463 goto out_free_pid_list;
2465 if (setup_list(&symbol_conf.sym_list,
2466 symbol_conf.sym_list_str, "symbol") < 0)
2467 goto out_free_tid_list;
2469 if (setup_list(&symbol_conf.bt_stop_list,
2470 symbol_conf.bt_stop_list_str, "symbol") < 0)
2471 goto out_free_sym_list;
2474 * A path to symbols of "/" is identical to ""
2475 * reset here for simplicity.
2477 symfs = realpath(symbol_conf.symfs, NULL);
2479 symfs = symbol_conf.symfs;
2480 if (strcmp(symfs, "/") == 0)
2481 symbol_conf.symfs = "";
2482 if (symfs != symbol_conf.symfs)
2483 free((void *)symfs);
2485 symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2487 symbol_conf.initialized = true;
2491 strlist__delete(symbol_conf.sym_list);
2493 intlist__delete(symbol_conf.tid_list);
2495 intlist__delete(symbol_conf.pid_list);
2497 strlist__delete(symbol_conf.comm_list);
2499 strlist__delete(symbol_conf.dso_list);
2503 void symbol__exit(void)
2505 if (!symbol_conf.initialized)
2507 strlist__delete(symbol_conf.bt_stop_list);
2508 strlist__delete(symbol_conf.sym_list);
2509 strlist__delete(symbol_conf.dso_list);
2510 strlist__delete(symbol_conf.comm_list);
2511 intlist__delete(symbol_conf.tid_list);
2512 intlist__delete(symbol_conf.pid_list);
2513 vmlinux_path__exit();
2514 symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2515 symbol_conf.bt_stop_list = NULL;
2516 symbol_conf.initialized = false;
2519 int symbol__config_symfs(const struct option *opt __maybe_unused,
2520 const char *dir, int unset __maybe_unused)
2525 symbol_conf.symfs = strdup(dir);
2526 if (symbol_conf.symfs == NULL)
2529 /* skip the locally configured cache if a symfs is given, and
2530 * config buildid dir to symfs/.debug
2532 ret = asprintf(&bf, "%s/%s", dir, ".debug");
2536 set_buildid_dir(bf);
2542 struct mem_info *mem_info__get(struct mem_info *mi)
2545 refcount_inc(&mi->refcnt);
2549 void mem_info__put(struct mem_info *mi)
2551 if (mi && refcount_dec_and_test(&mi->refcnt))
2555 struct mem_info *mem_info__new(void)
2557 struct mem_info *mi = zalloc(sizeof(*mi));
2560 refcount_set(&mi->refcnt, 1);