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__has_symbols(const struct map *map)
266 return dso__has_symbols(map->dso);
269 static void map__exit(struct map *map)
271 BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
275 void map__delete(struct map *map)
281 void map__put(struct map *map)
283 if (map && refcount_dec_and_test(&map->refcnt))
287 void map__fixup_start(struct map *map)
289 struct rb_root_cached *symbols = &map->dso->symbols;
290 struct rb_node *nd = rb_first_cached(symbols);
292 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
293 map->start = sym->start;
297 void map__fixup_end(struct map *map)
299 struct rb_root_cached *symbols = &map->dso->symbols;
300 struct rb_node *nd = rb_last(&symbols->rb_root);
302 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
307 #define DSO__DELETED "(deleted)"
309 int map__load(struct map *map)
311 const char *name = map->dso->long_name;
314 if (dso__loaded(map->dso))
317 nr = dso__load(map->dso, map);
319 if (map->dso->has_build_id) {
320 char sbuild_id[SBUILD_ID_SIZE];
322 build_id__sprintf(map->dso->build_id,
323 sizeof(map->dso->build_id),
325 pr_debug("%s with build id %s not found", name, sbuild_id);
327 pr_debug("Failed to open %s", name);
329 pr_debug(", continuing without symbols\n");
331 } else if (nr == 0) {
332 #ifdef HAVE_LIBELF_SUPPORT
333 const size_t len = strlen(name);
334 const size_t real_len = len - sizeof(DSO__DELETED);
336 if (len > sizeof(DSO__DELETED) &&
337 strcmp(name + real_len + 1, DSO__DELETED) == 0) {
338 pr_debug("%.*s was updated (is prelink enabled?). "
339 "Restart the long running apps that use it!\n",
340 (int)real_len, name);
342 pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
351 struct symbol *map__find_symbol(struct map *map, u64 addr)
353 if (map__load(map) < 0)
356 return dso__find_symbol(map->dso, addr);
359 struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
361 if (map__load(map) < 0)
364 if (!dso__sorted_by_name(map->dso))
365 dso__sort_by_name(map->dso);
367 return dso__find_symbol_by_name(map->dso, name);
370 struct map *map__clone(struct map *from)
372 struct map *map = memdup(from, sizeof(*map));
375 refcount_set(&map->refcnt, 1);
376 RB_CLEAR_NODE(&map->rb_node);
384 size_t map__fprintf(struct map *map, FILE *fp)
386 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
387 map->start, map->end, map->pgoff, map->dso->name);
390 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
392 const char *dsoname = "[unknown]";
394 if (map && map->dso) {
395 if (symbol_conf.show_kernel_path && map->dso->long_name)
396 dsoname = map->dso->long_name;
398 dsoname = map->dso->name;
401 return fprintf(fp, "%s", dsoname);
404 char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
407 return SRCLINE_UNKNOWN;
408 return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr);
411 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
416 if (map && map->dso) {
417 char *srcline = map__srcline(map, addr, NULL);
418 if (srcline != SRCLINE_UNKNOWN)
419 ret = fprintf(fp, "%s%s", prefix, srcline);
420 free_srcline(srcline);
425 int map__fprintf_srccode(struct map *map, u64 addr,
427 struct srccode_state *state)
435 if (!map || !map->dso)
437 srcfile = get_srcline_split(map->dso,
438 map__rip_2objdump(map, addr),
443 /* Avoid redundant printing */
446 !strcmp(state->srcfile, srcfile) &&
447 state->line == line) {
452 srccode = find_sourceline(srcfile, line, &len);
456 ret = fprintf(fp, "|%-8d %.*s", line, len, srccode);
457 state->srcfile = srcfile;
467 void srccode_state_free(struct srccode_state *state)
469 zfree(&state->srcfile);
474 * map__rip_2objdump - convert symbol start address to objdump address.
476 * @rip: symbol start address
478 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
479 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
480 * relative to section start.
482 * Return: Address suitable for passing to "objdump --start-address="
484 u64 map__rip_2objdump(struct map *map, u64 rip)
486 struct kmap *kmap = __map__kmap(map);
489 * vmlinux does not have program headers for PTI entry trampolines and
490 * kcore may not either. However the trampoline object code is on the
491 * main kernel map, so just use that instead.
493 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
494 struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
500 if (!map->dso->adjust_symbols)
504 return rip - map->pgoff;
507 * kernel modules also have DSO_TYPE_USER in dso->kernel,
508 * but all kernel modules are ET_REL, so won't get here.
510 if (map->dso->kernel == DSO_TYPE_USER)
511 return rip + map->dso->text_offset;
513 return map->unmap_ip(map, rip) - map->reloc;
517 * map__objdump_2mem - convert objdump address to a memory address.
519 * @ip: objdump address
521 * Closely related to map__rip_2objdump(), this function takes an address from
522 * objdump and converts it to a memory address. Note this assumes that @map
523 * contains the address. To be sure the result is valid, check it forwards
524 * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
526 * Return: Memory address.
528 u64 map__objdump_2mem(struct map *map, u64 ip)
530 if (!map->dso->adjust_symbols)
531 return map->unmap_ip(map, ip);
534 return map->unmap_ip(map, ip + map->pgoff);
537 * kernel modules also have DSO_TYPE_USER in dso->kernel,
538 * but all kernel modules are ET_REL, so won't get here.
540 if (map->dso->kernel == DSO_TYPE_USER)
541 return map->unmap_ip(map, ip - map->dso->text_offset);
543 return ip + map->reloc;
546 static void maps__init(struct maps *maps)
548 maps->entries = RB_ROOT;
549 maps->names = RB_ROOT;
550 init_rwsem(&maps->lock);
553 void map_groups__init(struct map_groups *mg, struct machine *machine)
555 maps__init(&mg->maps);
556 mg->machine = machine;
557 refcount_set(&mg->refcnt, 1);
560 void map_groups__insert(struct map_groups *mg, struct map *map)
562 maps__insert(&mg->maps, map);
566 static void __maps__purge(struct maps *maps)
568 struct rb_root *root = &maps->entries;
569 struct rb_node *next = rb_first(root);
572 struct map *pos = rb_entry(next, struct map, rb_node);
574 next = rb_next(&pos->rb_node);
575 rb_erase_init(&pos->rb_node, root);
580 static void maps__exit(struct maps *maps)
582 down_write(&maps->lock);
584 up_write(&maps->lock);
587 void map_groups__exit(struct map_groups *mg)
589 maps__exit(&mg->maps);
592 bool map_groups__empty(struct map_groups *mg)
594 return !maps__first(&mg->maps);
597 struct map_groups *map_groups__new(struct machine *machine)
599 struct map_groups *mg = malloc(sizeof(*mg));
602 map_groups__init(mg, machine);
607 void map_groups__delete(struct map_groups *mg)
609 map_groups__exit(mg);
613 void map_groups__put(struct map_groups *mg)
615 if (mg && refcount_dec_and_test(&mg->refcnt))
616 map_groups__delete(mg);
619 struct symbol *map_groups__find_symbol(struct map_groups *mg,
620 u64 addr, struct map **mapp)
622 struct map *map = map_groups__find(mg, addr);
624 /* Ensure map is loaded before using map->map_ip */
625 if (map != NULL && map__load(map) >= 0) {
628 return map__find_symbol(map, map->map_ip(map, addr));
634 static bool map__contains_symbol(struct map *map, struct symbol *sym)
636 u64 ip = map->unmap_ip(map, sym->start);
638 return ip >= map->start && ip < map->end;
641 struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
647 down_read(&maps->lock);
649 for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
650 struct map *pos = rb_entry(nd, struct map, rb_node);
652 sym = map__find_symbol_by_name(pos, name);
656 if (!map__contains_symbol(pos, sym)) {
667 up_read(&maps->lock);
671 struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
675 return maps__find_symbol_by_name(&mg->maps, name, mapp);
678 int map_groups__find_ams(struct addr_map_symbol *ams)
680 if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
681 if (ams->map->groups == NULL)
683 ams->map = map_groups__find(ams->map->groups, ams->addr);
684 if (ams->map == NULL)
688 ams->al_addr = ams->map->map_ip(ams->map, ams->addr);
689 ams->sym = map__find_symbol(ams->map, ams->al_addr);
691 return ams->sym ? 0 : -1;
694 static size_t maps__fprintf(struct maps *maps, FILE *fp)
699 down_read(&maps->lock);
701 for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
702 struct map *pos = rb_entry(nd, struct map, rb_node);
703 printed += fprintf(fp, "Map:");
704 printed += map__fprintf(pos, fp);
706 printed += dso__fprintf(pos->dso, fp);
707 printed += fprintf(fp, "--\n");
711 up_read(&maps->lock);
716 size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
718 return maps__fprintf(&mg->maps, fp);
721 static void __map_groups__insert(struct map_groups *mg, struct map *map)
723 __maps__insert(&mg->maps, map);
724 __maps__insert_name(&mg->maps, map);
728 static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
730 struct rb_root *root;
731 struct rb_node *next, *first;
734 down_write(&maps->lock);
736 root = &maps->entries;
739 * Find first map where end > map->start.
740 * Same as find_vma() in kernel.
742 next = root->rb_node;
745 struct map *pos = rb_entry(next, struct map, rb_node);
747 if (pos->end > map->start) {
749 if (pos->start <= map->start)
751 next = next->rb_left;
753 next = next->rb_right;
758 struct map *pos = rb_entry(next, struct map, rb_node);
759 next = rb_next(&pos->rb_node);
762 * Stop if current map starts after map->end.
763 * Maps are ordered by start: next will not overlap for sure.
765 if (pos->start >= map->end)
771 pr_debug("overlapping maps in %s (disable tui for more info)\n",
774 fputs("overlapping maps:\n", fp);
775 map__fprintf(map, fp);
776 map__fprintf(pos, fp);
780 rb_erase_init(&pos->rb_node, root);
782 * Now check if we need to create new maps for areas not
783 * overlapped by the new map:
785 if (map->start > pos->start) {
786 struct map *before = map__clone(pos);
788 if (before == NULL) {
793 before->end = map->start;
794 __map_groups__insert(pos->groups, before);
795 if (verbose >= 2 && !use_browser)
796 map__fprintf(before, fp);
800 if (map->end < pos->end) {
801 struct map *after = map__clone(pos);
808 after->start = map->end;
809 __map_groups__insert(pos->groups, after);
810 if (verbose >= 2 && !use_browser)
811 map__fprintf(after, fp);
823 up_write(&maps->lock);
827 int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
830 return maps__fixup_overlappings(&mg->maps, map, fp);
834 * XXX This should not really _copy_ te maps, but refcount them.
836 int map_groups__clone(struct thread *thread, struct map_groups *parent)
838 struct map_groups *mg = thread->mg;
841 struct maps *maps = &parent->maps;
843 down_read(&maps->lock);
845 for (map = maps__first(maps); map; map = map__next(map)) {
846 struct map *new = map__clone(map);
850 err = unwind__prepare_access(thread, new, NULL);
854 map_groups__insert(mg, new);
860 up_read(&maps->lock);
864 static void __maps__insert(struct maps *maps, struct map *map)
866 struct rb_node **p = &maps->entries.rb_node;
867 struct rb_node *parent = NULL;
868 const u64 ip = map->start;
873 m = rb_entry(parent, struct map, rb_node);
880 rb_link_node(&map->rb_node, parent, p);
881 rb_insert_color(&map->rb_node, &maps->entries);
885 static void __maps__insert_name(struct maps *maps, struct map *map)
887 struct rb_node **p = &maps->names.rb_node;
888 struct rb_node *parent = NULL;
894 m = rb_entry(parent, struct map, rb_node_name);
895 rc = strcmp(m->dso->short_name, map->dso->short_name);
903 rb_link_node(&map->rb_node_name, parent, p);
904 rb_insert_color(&map->rb_node_name, &maps->names);
908 void maps__insert(struct maps *maps, struct map *map)
910 down_write(&maps->lock);
911 __maps__insert(maps, map);
912 __maps__insert_name(maps, map);
913 up_write(&maps->lock);
916 static void __maps__remove(struct maps *maps, struct map *map)
918 rb_erase_init(&map->rb_node, &maps->entries);
922 void maps__remove(struct maps *maps, struct map *map)
924 down_write(&maps->lock);
925 __maps__remove(maps, map);
926 up_write(&maps->lock);
929 struct map *maps__find(struct maps *maps, u64 ip)
934 down_read(&maps->lock);
936 p = maps->entries.rb_node;
938 m = rb_entry(p, struct map, rb_node);
941 else if (ip >= m->end)
949 up_read(&maps->lock);
953 struct map *maps__first(struct maps *maps)
955 struct rb_node *first = rb_first(&maps->entries);
958 return rb_entry(first, struct map, rb_node);
962 struct map *map__next(struct map *map)
964 struct rb_node *next = rb_next(&map->rb_node);
967 return rb_entry(next, struct map, rb_node);
971 struct kmap *__map__kmap(struct map *map)
973 if (!map->dso || !map->dso->kernel)
975 return (struct kmap *)(map + 1);
978 struct kmap *map__kmap(struct map *map)
980 struct kmap *kmap = __map__kmap(map);
983 pr_err("Internal error: map__kmap with a non-kernel map\n");
987 struct map_groups *map__kmaps(struct map *map)
989 struct kmap *kmap = map__kmap(map);
991 if (!kmap || !kmap->kmaps) {
992 pr_err("Internal error: map__kmaps with a non-kernel map\n");