1 // SPDX-License-Identifier: GPL-2.0
7 #include <linux/string.h>
8 #include <linux/zalloc.h>
9 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
13 #include "namespaces.h"
19 static inline int is_android_lib(const char *filename)
21 return strstarts(filename, "/data/app-lib/") ||
22 strstarts(filename, "/system/lib/");
25 static inline bool replace_android_lib(const char *filename, char *newfilename)
29 size_t app_abi_length, new_length;
30 size_t lib_length = 0;
32 libname = strrchr(filename, '/');
34 lib_length = strlen(libname);
36 app_abi = getenv("APP_ABI");
40 app_abi_length = strlen(app_abi);
42 if (strstarts(filename, "/data/app-lib/")) {
48 new_length = 7 + app_abi_length + lib_length;
50 apk_path = getenv("APK_PATH");
52 new_length += strlen(apk_path) + 1;
53 if (new_length > PATH_MAX)
55 snprintf(newfilename, new_length,
56 "%s/libs/%s/%s", apk_path, app_abi, libname);
58 if (new_length > PATH_MAX)
60 snprintf(newfilename, new_length,
61 "libs/%s/%s", app_abi, libname);
66 if (strstarts(filename, "/system/lib/")) {
69 int ndk_length, app_length;
71 ndk = getenv("NDK_ROOT");
72 app = getenv("APP_PLATFORM");
77 ndk_length = strlen(ndk);
78 app_length = strlen(app);
80 if (!(ndk_length && app_length && app_abi_length))
83 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
84 !strncmp(app_abi, "mips", 4) ? "mips" :
85 !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
90 new_length = 27 + ndk_length +
91 app_length + lib_length
94 if (new_length > PATH_MAX)
96 snprintf(newfilename, new_length,
97 "%.*s/platforms/%.*s/arch-%s/usr/lib/%s",
98 ndk_length, ndk, app_length, app, arch, libname);
105 void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
111 map->dso = dso__get(dso);
112 map->map_ip = map__map_ip;
113 map->unmap_ip = map__unmap_ip;
114 RB_CLEAR_NODE(&map->rb_node);
115 map->erange_warned = false;
116 refcount_set(&map->refcnt, 1);
119 struct map *map__new(struct machine *machine, u64 start, u64 len,
120 u64 pgoff, struct dso_id *id,
121 u32 prot, u32 flags, struct build_id *bid,
122 char *filename, struct thread *thread)
124 struct map *map = malloc(sizeof(*map));
125 struct nsinfo *nsi = NULL;
129 char newfilename[PATH_MAX];
130 struct dso *dso, *header_bid_dso;
131 int anon, no_dso, vdso, android;
133 android = is_android_lib(filename);
134 anon = is_anon_memory(filename) || flags & MAP_HUGETLB;
135 vdso = is_vdso_map(filename);
136 no_dso = is_no_dso_memory(filename);
139 nsi = nsinfo__get(thread->nsinfo);
141 if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {
142 snprintf(newfilename, sizeof(newfilename),
143 "/tmp/perf-%d.map", nsinfo__pid(nsi));
144 filename = newfilename;
148 if (replace_android_lib(filename, newfilename))
149 filename = newfilename;
153 /* The vdso maps are always on the host and not the
154 * container. Ensure that we don't use setns to look
157 nnsi = nsinfo__copy(nsi);
160 nsinfo__clear_need_setns(nnsi);
164 dso = machine__findnew_vdso(machine, thread);
166 dso = machine__findnew_dso_id(machine, filename, id);
171 map__init(map, start, start + len, pgoff, dso);
173 if (anon || no_dso) {
174 map->map_ip = map->unmap_ip = identity__map_ip;
177 * Set memory without DSO as loaded. All map__find_*
178 * functions still return NULL, and we avoid the
179 * unnecessary map__load warning.
181 if (!(prot & PROT_EXEC))
182 dso__set_loaded(dso);
186 if (build_id__is_defined(bid)) {
187 dso__set_build_id(dso, bid);
190 * If the mmap event had no build ID, search for an existing dso from the
191 * build ID header by name. Otherwise only the dso loaded at the time of
192 * reading the header will have the build ID set and all future mmaps will
195 down_read(&machine->dsos.lock);
196 header_bid_dso = __dsos__find(&machine->dsos, filename, false);
197 up_read(&machine->dsos.lock);
198 if (header_bid_dso && header_bid_dso->header_build_id) {
199 dso__set_build_id(dso, &header_bid_dso->bid);
200 dso->header_build_id = 1;
213 * Constructor variant for modules (where we know from /proc/modules where
214 * they are loaded) and for vmlinux, where only after we load all the
215 * symbols we'll know where it starts and ends.
217 struct map *map__new2(u64 start, struct dso *dso)
219 struct map *map = calloc(1, (sizeof(*map) +
220 (dso->kernel ? sizeof(struct kmap) : 0)));
223 * ->end will be filled after we load all the symbols
225 map__init(map, start, 0, 0, dso);
231 bool __map__is_kernel(const struct map *map)
233 if (!map->dso->kernel)
235 return machine__kernel_map(map__kmaps((struct map *)map)->machine) == map;
238 bool __map__is_extra_kernel_map(const struct map *map)
240 struct kmap *kmap = __map__kmap((struct map *)map);
242 return kmap && kmap->name[0];
245 bool __map__is_bpf_prog(const struct map *map)
249 if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
253 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
254 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
255 * guess the type based on name.
257 name = map->dso->short_name;
258 return name && (strstr(name, "bpf_prog_") == name);
261 bool __map__is_bpf_image(const struct map *map)
265 if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
269 * If PERF_RECORD_KSYMBOL is not included, the dso will not have
270 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
271 * guess the type based on name.
273 name = map->dso->short_name;
274 return name && is_bpf_image(name);
277 bool __map__is_ool(const struct map *map)
279 return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;
282 bool map__has_symbols(const struct map *map)
284 return dso__has_symbols(map->dso);
287 static void map__exit(struct map *map)
289 BUG_ON(refcount_read(&map->refcnt) != 0);
293 void map__delete(struct map *map)
299 void map__put(struct map *map)
301 if (map && refcount_dec_and_test(&map->refcnt))
305 void map__fixup_start(struct map *map)
307 struct rb_root_cached *symbols = &map->dso->symbols;
308 struct rb_node *nd = rb_first_cached(symbols);
310 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
311 map->start = sym->start;
315 void map__fixup_end(struct map *map)
317 struct rb_root_cached *symbols = &map->dso->symbols;
318 struct rb_node *nd = rb_last(&symbols->rb_root);
320 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
325 #define DSO__DELETED "(deleted)"
327 int map__load(struct map *map)
329 const char *name = map->dso->long_name;
332 if (dso__loaded(map->dso))
335 nr = dso__load(map->dso, map);
337 if (map->dso->has_build_id) {
338 char sbuild_id[SBUILD_ID_SIZE];
340 build_id__sprintf(&map->dso->bid, sbuild_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 size_t size = sizeof(struct map);
391 if (from->dso && from->dso->kernel)
392 size += sizeof(struct kmap);
394 map = memdup(from, size);
396 refcount_set(&map->refcnt, 1);
397 RB_CLEAR_NODE(&map->rb_node);
404 size_t map__fprintf(struct map *map, FILE *fp)
406 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
407 map->start, map->end, map->pgoff, map->dso->name);
410 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
412 char buf[symbol_conf.pad_output_len_dso + 1];
413 const char *dsoname = "[unknown]";
415 if (map && map->dso) {
416 if (symbol_conf.show_kernel_path && map->dso->long_name)
417 dsoname = map->dso->long_name;
419 dsoname = map->dso->name;
422 if (symbol_conf.pad_output_len_dso) {
423 scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
427 return fprintf(fp, "%s", dsoname);
430 char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
433 return SRCLINE_UNKNOWN;
434 return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr);
437 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
442 if (map && map->dso) {
443 char *srcline = map__srcline(map, addr, NULL);
444 if (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)
445 ret = fprintf(fp, "%s%s", prefix, srcline);
446 free_srcline(srcline);
451 void srccode_state_free(struct srccode_state *state)
453 zfree(&state->srcfile);
458 * map__rip_2objdump - convert symbol start address to objdump address.
460 * @rip: symbol start address
462 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
463 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
464 * relative to section start.
466 * Return: Address suitable for passing to "objdump --start-address="
468 u64 map__rip_2objdump(struct map *map, u64 rip)
470 struct kmap *kmap = __map__kmap(map);
473 * vmlinux does not have program headers for PTI entry trampolines and
474 * kcore may not either. However the trampoline object code is on the
475 * main kernel map, so just use that instead.
477 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
478 struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
484 if (!map->dso->adjust_symbols)
488 return rip - map->pgoff;
491 * kernel modules also have DSO_TYPE_USER in dso->kernel,
492 * but all kernel modules are ET_REL, so won't get here.
494 if (map->dso->kernel == DSO_SPACE__USER)
495 return rip + map->dso->text_offset;
497 return map->unmap_ip(map, rip) - map->reloc;
501 * map__objdump_2mem - convert objdump address to a memory address.
503 * @ip: objdump address
505 * Closely related to map__rip_2objdump(), this function takes an address from
506 * objdump and converts it to a memory address. Note this assumes that @map
507 * contains the address. To be sure the result is valid, check it forwards
508 * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip
510 * Return: Memory address.
512 u64 map__objdump_2mem(struct map *map, u64 ip)
514 if (!map->dso->adjust_symbols)
515 return map->unmap_ip(map, ip);
518 return map->unmap_ip(map, ip + map->pgoff);
521 * kernel modules also have DSO_TYPE_USER in dso->kernel,
522 * but all kernel modules are ET_REL, so won't get here.
524 if (map->dso->kernel == DSO_SPACE__USER)
525 return map->unmap_ip(map, ip - map->dso->text_offset);
527 return ip + map->reloc;
530 bool map__contains_symbol(const struct map *map, const struct symbol *sym)
532 u64 ip = map->unmap_ip(map, sym->start);
534 return ip >= map->start && ip < map->end;
537 static struct map *__map__next(struct map *map)
539 struct rb_node *next = rb_next(&map->rb_node);
542 return rb_entry(next, struct map, rb_node);
546 struct map *map__next(struct map *map)
548 return map ? __map__next(map) : NULL;
551 struct kmap *__map__kmap(struct map *map)
553 if (!map->dso || !map->dso->kernel)
555 return (struct kmap *)(map + 1);
558 struct kmap *map__kmap(struct map *map)
560 struct kmap *kmap = __map__kmap(map);
563 pr_err("Internal error: map__kmap with a non-kernel map\n");
567 struct maps *map__kmaps(struct map *map)
569 struct kmap *kmap = map__kmap(map);
571 if (!kmap || !kmap->kmaps) {
572 pr_err("Internal error: map__kmaps with a non-kernel map\n");
578 u64 map__map_ip(const struct map *map, u64 ip)
580 return ip - map->start + map->pgoff;
583 u64 map__unmap_ip(const struct map *map, u64 ip)
585 return ip + map->start - map->pgoff;
588 u64 identity__map_ip(const struct map *map __maybe_unused, u64 ip)