1 // SPDX-License-Identifier: GPL-2.0
10 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
18 #include <linux/string.h>
20 #include "namespaces.h"
24 static void __maps__insert(struct maps *maps, struct map *map);
25 static void __maps__insert_name(struct maps *maps, struct map *map);
27 static inline int is_anon_memory(const char *filename, u32 flags)
29 return flags & MAP_HUGETLB ||
30 !strcmp(filename, "//anon") ||
31 !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) ||
32 !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1);
35 static inline int is_no_dso_memory(const char *filename)
37 return !strncmp(filename, "[stack", 6) ||
38 !strncmp(filename, "/SYSV",5) ||
39 !strcmp(filename, "[heap]");
42 static inline int is_android_lib(const char *filename)
44 return !strncmp(filename, "/data/app-lib", 13) ||
45 !strncmp(filename, "/system/lib", 11);
48 static inline bool replace_android_lib(const char *filename, char *newfilename)
52 size_t app_abi_length, new_length;
53 size_t lib_length = 0;
55 libname = strrchr(filename, '/');
57 lib_length = strlen(libname);
59 app_abi = getenv("APP_ABI");
63 app_abi_length = strlen(app_abi);
65 if (!strncmp(filename, "/data/app-lib", 13)) {
71 new_length = 7 + app_abi_length + lib_length;
73 apk_path = getenv("APK_PATH");
75 new_length += strlen(apk_path) + 1;
76 if (new_length > PATH_MAX)
78 snprintf(newfilename, new_length,
79 "%s/libs/%s/%s", apk_path, app_abi, libname);
81 if (new_length > PATH_MAX)
83 snprintf(newfilename, new_length,
84 "libs/%s/%s", app_abi, libname);
89 if (!strncmp(filename, "/system/lib/", 11)) {
95 ndk = getenv("NDK_ROOT");
96 app = getenv("APP_PLATFORM");
101 ndk_length = strlen(ndk);
102 app_length = strlen(app);
104 if (!(ndk_length && app_length && app_abi_length))
107 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
108 !strncmp(app_abi, "mips", 4) ? "mips" :
109 !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
114 new_length = 27 + ndk_length +
115 app_length + lib_length
118 if (new_length > PATH_MAX)
120 snprintf(newfilename, new_length,
121 "%s/platforms/%s/arch-%s/usr/lib/%s",
122 ndk, app, arch, libname);
129 void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
135 map->dso = dso__get(dso);
136 map->map_ip = map__map_ip;
137 map->unmap_ip = map__unmap_ip;
138 RB_CLEAR_NODE(&map->rb_node);
140 map->erange_warned = false;
141 refcount_set(&map->refcnt, 1);
144 struct map *map__new(struct machine *machine, u64 start, u64 len,
145 u64 pgoff, u32 d_maj, u32 d_min, u64 ino,
146 u64 ino_gen, u32 prot, u32 flags, char *filename,
147 struct thread *thread)
149 struct map *map = malloc(sizeof(*map));
150 struct nsinfo *nsi = NULL;
154 char newfilename[PATH_MAX];
156 int anon, no_dso, vdso, android;
158 android = is_android_lib(filename);
159 anon = is_anon_memory(filename, flags);
160 vdso = is_vdso_map(filename);
161 no_dso = is_no_dso_memory(filename);
166 map->ino_generation = ino_gen;
169 nsi = nsinfo__get(thread->nsinfo);
171 if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {
172 snprintf(newfilename, sizeof(newfilename),
173 "/tmp/perf-%d.map", nsi->pid);
174 filename = newfilename;
178 if (replace_android_lib(filename, newfilename))
179 filename = newfilename;
183 /* The vdso maps are always on the host and not the
184 * container. Ensure that we don't use setns to look
187 nnsi = nsinfo__copy(nsi);
190 nnsi->need_setns = false;
194 dso = machine__findnew_vdso(machine, thread);
196 dso = machine__findnew_dso(machine, filename);
201 map__init(map, start, start + len, pgoff, dso);
203 if (anon || no_dso) {
204 map->map_ip = map->unmap_ip = identity__map_ip;
207 * Set memory without DSO as loaded. All map__find_*
208 * functions still return NULL, and we avoid the
209 * unnecessary map__load warning.
211 if (!(prot & PROT_EXEC))
212 dso__set_loaded(dso);
225 * Constructor variant for modules (where we know from /proc/modules where
226 * they are loaded) and for vmlinux, where only after we load all the
227 * symbols we'll know where it starts and ends.
229 struct map *map__new2(u64 start, struct dso *dso)
231 struct map *map = calloc(1, (sizeof(*map) +
232 (dso->kernel ? sizeof(struct kmap) : 0)));
235 * ->end will be filled after we load all the symbols
237 map__init(map, start, 0, 0, dso);
244 * Use this and __map__is_kmodule() for map instances that are in
245 * machine->kmaps, and thus have map->groups->machine all properly set, to
246 * disambiguate between the kernel and modules.
248 * When the need arises, introduce map__is_{kernel,kmodule)() that
249 * checks (map->groups != NULL && map->groups->machine != NULL &&
250 * map->dso->kernel) before calling __map__is_{kernel,kmodule}())
252 bool __map__is_kernel(const struct map *map)
254 return machine__kernel_map(map->groups->machine) == map;
257 bool __map__is_extra_kernel_map(const struct map *map)
259 struct kmap *kmap = __map__kmap((struct map *)map);
261 return kmap && kmap->name[0];
264 bool __map__is_bpf_prog(const struct map *map)
268 if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
272 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
273 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
274 * guess the type based on name.
276 name = map->dso->short_name;
277 return name && (strstr(name, "bpf_prog_") == name);
280 bool map__has_symbols(const struct map *map)
282 return dso__has_symbols(map->dso);
285 static void map__exit(struct map *map)
287 BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
291 void map__delete(struct map *map)
297 void map__put(struct map *map)
299 if (map && refcount_dec_and_test(&map->refcnt))
303 void map__fixup_start(struct map *map)
305 struct rb_root_cached *symbols = &map->dso->symbols;
306 struct rb_node *nd = rb_first_cached(symbols);
308 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
309 map->start = sym->start;
313 void map__fixup_end(struct map *map)
315 struct rb_root_cached *symbols = &map->dso->symbols;
316 struct rb_node *nd = rb_last(&symbols->rb_root);
318 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
323 #define DSO__DELETED "(deleted)"
325 int map__load(struct map *map)
327 const char *name = map->dso->long_name;
330 if (dso__loaded(map->dso))
333 nr = dso__load(map->dso, map);
335 if (map->dso->has_build_id) {
336 char sbuild_id[SBUILD_ID_SIZE];
338 build_id__sprintf(map->dso->build_id,
339 sizeof(map->dso->build_id),
341 pr_debug("%s with build id %s not found", name, sbuild_id);
343 pr_debug("Failed to open %s", name);
345 pr_debug(", continuing without symbols\n");
347 } else if (nr == 0) {
348 #ifdef HAVE_LIBELF_SUPPORT
349 const size_t len = strlen(name);
350 const size_t real_len = len - sizeof(DSO__DELETED);
352 if (len > sizeof(DSO__DELETED) &&
353 strcmp(name + real_len + 1, DSO__DELETED) == 0) {
354 pr_debug("%.*s was updated (is prelink enabled?). "
355 "Restart the long running apps that use it!\n",
356 (int)real_len, name);
358 pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
367 struct symbol *map__find_symbol(struct map *map, u64 addr)
369 if (map__load(map) < 0)
372 return dso__find_symbol(map->dso, addr);
375 struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
377 if (map__load(map) < 0)
380 if (!dso__sorted_by_name(map->dso))
381 dso__sort_by_name(map->dso);
383 return dso__find_symbol_by_name(map->dso, name);
386 struct map *map__clone(struct map *from)
388 struct map *map = memdup(from, sizeof(*map));
391 refcount_set(&map->refcnt, 1);
392 RB_CLEAR_NODE(&map->rb_node);
400 size_t map__fprintf(struct map *map, FILE *fp)
402 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
403 map->start, map->end, map->pgoff, map->dso->name);
406 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
408 const char *dsoname = "[unknown]";
410 if (map && map->dso) {
411 if (symbol_conf.show_kernel_path && map->dso->long_name)
412 dsoname = map->dso->long_name;
414 dsoname = map->dso->name;
417 return fprintf(fp, "%s", dsoname);
420 char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
423 return SRCLINE_UNKNOWN;
424 return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr);
427 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
432 if (map && map->dso) {
433 char *srcline = map__srcline(map, addr, NULL);
434 if (srcline != SRCLINE_UNKNOWN)
435 ret = fprintf(fp, "%s%s", prefix, srcline);
436 free_srcline(srcline);
441 int map__fprintf_srccode(struct map *map, u64 addr,
443 struct srccode_state *state)
451 if (!map || !map->dso)
453 srcfile = get_srcline_split(map->dso,
454 map__rip_2objdump(map, addr),
459 /* Avoid redundant printing */
462 !strcmp(state->srcfile, srcfile) &&
463 state->line == line) {
468 srccode = find_sourceline(srcfile, line, &len);
472 ret = fprintf(fp, "|%-8d %.*s", line, len, srccode);
473 state->srcfile = srcfile;
483 void srccode_state_free(struct srccode_state *state)
485 zfree(&state->srcfile);
490 * map__rip_2objdump - convert symbol start address to objdump address.
492 * @rip: symbol start address
494 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
495 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
496 * relative to section start.
498 * Return: Address suitable for passing to "objdump --start-address="
500 u64 map__rip_2objdump(struct map *map, u64 rip)
502 struct kmap *kmap = __map__kmap(map);
505 * vmlinux does not have program headers for PTI entry trampolines and
506 * kcore may not either. However the trampoline object code is on the
507 * main kernel map, so just use that instead.
509 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
510 struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
516 if (!map->dso->adjust_symbols)
520 return rip - map->pgoff;
523 * kernel modules also have DSO_TYPE_USER in dso->kernel,
524 * but all kernel modules are ET_REL, so won't get here.
526 if (map->dso->kernel == DSO_TYPE_USER)
527 return rip + map->dso->text_offset;
529 return map->unmap_ip(map, rip) - map->reloc;
533 * map__objdump_2mem - convert objdump address to a memory address.
535 * @ip: objdump address
537 * Closely related to map__rip_2objdump(), this function takes an address from
538 * objdump and converts it to a memory address. Note this assumes that @map
539 * contains the address. To be sure the result is valid, check it forwards
540 * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
542 * Return: Memory address.
544 u64 map__objdump_2mem(struct map *map, u64 ip)
546 if (!map->dso->adjust_symbols)
547 return map->unmap_ip(map, ip);
550 return map->unmap_ip(map, ip + map->pgoff);
553 * kernel modules also have DSO_TYPE_USER in dso->kernel,
554 * but all kernel modules are ET_REL, so won't get here.
556 if (map->dso->kernel == DSO_TYPE_USER)
557 return map->unmap_ip(map, ip - map->dso->text_offset);
559 return ip + map->reloc;
562 static void maps__init(struct maps *maps)
564 maps->entries = RB_ROOT;
565 maps->names = RB_ROOT;
566 init_rwsem(&maps->lock);
569 void map_groups__init(struct map_groups *mg, struct machine *machine)
571 maps__init(&mg->maps);
572 mg->machine = machine;
573 refcount_set(&mg->refcnt, 1);
576 void map_groups__insert(struct map_groups *mg, struct map *map)
578 maps__insert(&mg->maps, map);
582 static void __maps__purge(struct maps *maps)
584 struct rb_root *root = &maps->entries;
585 struct rb_node *next = rb_first(root);
588 struct map *pos = rb_entry(next, struct map, rb_node);
590 next = rb_next(&pos->rb_node);
591 rb_erase_init(&pos->rb_node, root);
596 static void __maps__purge_names(struct maps *maps)
598 struct rb_root *root = &maps->names;
599 struct rb_node *next = rb_first(root);
602 struct map *pos = rb_entry(next, struct map, rb_node_name);
604 next = rb_next(&pos->rb_node_name);
605 rb_erase_init(&pos->rb_node_name, root);
610 static void maps__exit(struct maps *maps)
612 down_write(&maps->lock);
614 __maps__purge_names(maps);
615 up_write(&maps->lock);
618 void map_groups__exit(struct map_groups *mg)
620 maps__exit(&mg->maps);
623 bool map_groups__empty(struct map_groups *mg)
625 return !maps__first(&mg->maps);
628 struct map_groups *map_groups__new(struct machine *machine)
630 struct map_groups *mg = malloc(sizeof(*mg));
633 map_groups__init(mg, machine);
638 void map_groups__delete(struct map_groups *mg)
640 map_groups__exit(mg);
644 void map_groups__put(struct map_groups *mg)
646 if (mg && refcount_dec_and_test(&mg->refcnt))
647 map_groups__delete(mg);
650 struct symbol *map_groups__find_symbol(struct map_groups *mg,
651 u64 addr, struct map **mapp)
653 struct map *map = map_groups__find(mg, addr);
655 /* Ensure map is loaded before using map->map_ip */
656 if (map != NULL && map__load(map) >= 0) {
659 return map__find_symbol(map, map->map_ip(map, addr));
665 static bool map__contains_symbol(struct map *map, struct symbol *sym)
667 u64 ip = map->unmap_ip(map, sym->start);
669 return ip >= map->start && ip < map->end;
672 struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
678 down_read(&maps->lock);
680 for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
681 struct map *pos = rb_entry(nd, struct map, rb_node);
683 sym = map__find_symbol_by_name(pos, name);
687 if (!map__contains_symbol(pos, sym)) {
698 up_read(&maps->lock);
702 struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
706 return maps__find_symbol_by_name(&mg->maps, name, mapp);
709 int map_groups__find_ams(struct addr_map_symbol *ams)
711 if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
712 if (ams->map->groups == NULL)
714 ams->map = map_groups__find(ams->map->groups, ams->addr);
715 if (ams->map == NULL)
719 ams->al_addr = ams->map->map_ip(ams->map, ams->addr);
720 ams->sym = map__find_symbol(ams->map, ams->al_addr);
722 return ams->sym ? 0 : -1;
725 static size_t maps__fprintf(struct maps *maps, FILE *fp)
730 down_read(&maps->lock);
732 for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
733 struct map *pos = rb_entry(nd, struct map, rb_node);
734 printed += fprintf(fp, "Map:");
735 printed += map__fprintf(pos, fp);
737 printed += dso__fprintf(pos->dso, fp);
738 printed += fprintf(fp, "--\n");
742 up_read(&maps->lock);
747 size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
749 return maps__fprintf(&mg->maps, fp);
752 static void __map_groups__insert(struct map_groups *mg, struct map *map)
754 __maps__insert(&mg->maps, map);
755 __maps__insert_name(&mg->maps, map);
759 static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
761 struct rb_root *root;
762 struct rb_node *next, *first;
765 down_write(&maps->lock);
767 root = &maps->entries;
770 * Find first map where end > map->start.
771 * Same as find_vma() in kernel.
773 next = root->rb_node;
776 struct map *pos = rb_entry(next, struct map, rb_node);
778 if (pos->end > map->start) {
780 if (pos->start <= map->start)
782 next = next->rb_left;
784 next = next->rb_right;
789 struct map *pos = rb_entry(next, struct map, rb_node);
790 next = rb_next(&pos->rb_node);
793 * Stop if current map starts after map->end.
794 * Maps are ordered by start: next will not overlap for sure.
796 if (pos->start >= map->end)
802 pr_debug("overlapping maps in %s (disable tui for more info)\n",
805 fputs("overlapping maps:\n", fp);
806 map__fprintf(map, fp);
807 map__fprintf(pos, fp);
811 rb_erase_init(&pos->rb_node, root);
813 * Now check if we need to create new maps for areas not
814 * overlapped by the new map:
816 if (map->start > pos->start) {
817 struct map *before = map__clone(pos);
819 if (before == NULL) {
824 before->end = map->start;
825 __map_groups__insert(pos->groups, before);
826 if (verbose >= 2 && !use_browser)
827 map__fprintf(before, fp);
831 if (map->end < pos->end) {
832 struct map *after = map__clone(pos);
839 after->start = map->end;
840 __map_groups__insert(pos->groups, after);
841 if (verbose >= 2 && !use_browser)
842 map__fprintf(after, fp);
854 up_write(&maps->lock);
858 int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
861 return maps__fixup_overlappings(&mg->maps, map, fp);
865 * XXX This should not really _copy_ te maps, but refcount them.
867 int map_groups__clone(struct thread *thread, struct map_groups *parent)
869 struct map_groups *mg = thread->mg;
872 struct maps *maps = &parent->maps;
874 down_read(&maps->lock);
876 for (map = maps__first(maps); map; map = map__next(map)) {
877 struct map *new = map__clone(map);
881 err = unwind__prepare_access(thread, new, NULL);
885 map_groups__insert(mg, new);
891 up_read(&maps->lock);
895 static void __maps__insert(struct maps *maps, struct map *map)
897 struct rb_node **p = &maps->entries.rb_node;
898 struct rb_node *parent = NULL;
899 const u64 ip = map->start;
904 m = rb_entry(parent, struct map, rb_node);
911 rb_link_node(&map->rb_node, parent, p);
912 rb_insert_color(&map->rb_node, &maps->entries);
916 static void __maps__insert_name(struct maps *maps, struct map *map)
918 struct rb_node **p = &maps->names.rb_node;
919 struct rb_node *parent = NULL;
925 m = rb_entry(parent, struct map, rb_node_name);
926 rc = strcmp(m->dso->short_name, map->dso->short_name);
932 rb_link_node(&map->rb_node_name, parent, p);
933 rb_insert_color(&map->rb_node_name, &maps->names);
937 void maps__insert(struct maps *maps, struct map *map)
939 down_write(&maps->lock);
940 __maps__insert(maps, map);
941 __maps__insert_name(maps, map);
942 up_write(&maps->lock);
945 static void __maps__remove(struct maps *maps, struct map *map)
947 rb_erase_init(&map->rb_node, &maps->entries);
950 rb_erase_init(&map->rb_node_name, &maps->names);
954 void maps__remove(struct maps *maps, struct map *map)
956 down_write(&maps->lock);
957 __maps__remove(maps, map);
958 up_write(&maps->lock);
961 struct map *maps__find(struct maps *maps, u64 ip)
966 down_read(&maps->lock);
968 p = maps->entries.rb_node;
970 m = rb_entry(p, struct map, rb_node);
973 else if (ip >= m->end)
981 up_read(&maps->lock);
985 struct map *maps__first(struct maps *maps)
987 struct rb_node *first = rb_first(&maps->entries);
990 return rb_entry(first, struct map, rb_node);
994 struct map *map__next(struct map *map)
996 struct rb_node *next = rb_next(&map->rb_node);
999 return rb_entry(next, struct map, rb_node);
1003 struct kmap *__map__kmap(struct map *map)
1005 if (!map->dso || !map->dso->kernel)
1007 return (struct kmap *)(map + 1);
1010 struct kmap *map__kmap(struct map *map)
1012 struct kmap *kmap = __map__kmap(map);
1015 pr_err("Internal error: map__kmap with a non-kernel map\n");
1019 struct map_groups *map__kmaps(struct map *map)
1021 struct kmap *kmap = map__kmap(map);
1023 if (!kmap || !kmap->kmaps) {
1024 pr_err("Internal error: map__kmaps with a non-kernel map\n");