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)
107 map__set_start(map, start);
108 map__set_end(map, end);
109 map__set_pgoff(map, pgoff);
110 map__set_reloc(map, 0);
111 map__set_dso(map, dso__get(dso));
112 map__set_mapping_type(map, MAPPING_TYPE__DSO);
113 map__set_erange_warned(map, false);
114 refcount_set(map__refcnt(map), 1);
117 struct map *map__new(struct machine *machine, u64 start, u64 len,
118 u64 pgoff, struct dso_id *id,
119 u32 prot, u32 flags, struct build_id *bid,
120 char *filename, struct thread *thread)
124 struct nsinfo *nsi = NULL;
127 map = malloc(sizeof(*map));
128 if (ADD_RC_CHK(result, map)) {
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(thread));
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 assert(!dso__kernel(dso));
172 map__init(result, start, start + len, pgoff, dso);
174 if (anon || no_dso) {
175 map->mapping_type = MAPPING_TYPE__IDENTITY;
178 * Set memory without DSO as loaded. All map__find_*
179 * functions still return NULL, and we avoid the
180 * unnecessary map__load warning.
182 if (!(prot & PROT_EXEC))
183 dso__set_loaded(dso);
185 mutex_lock(dso__lock(dso));
186 dso__set_nsinfo(dso, nsi);
187 mutex_unlock(dso__lock(dso));
189 if (build_id__is_defined(bid)) {
190 dso__set_build_id(dso, bid);
193 * If the mmap event had no build ID, search for an existing dso from the
194 * build ID header by name. Otherwise only the dso loaded at the time of
195 * reading the header will have the build ID set and all future mmaps will
198 header_bid_dso = dsos__find(&machine->dsos, filename, false);
199 if (header_bid_dso && dso__header_build_id(header_bid_dso)) {
200 dso__set_build_id(dso, dso__bid(header_bid_dso));
201 dso__set_header_build_id(dso, 1);
203 dso__put(header_bid_dso);
215 * Constructor variant for modules (where we know from /proc/modules where
216 * they are loaded) and for vmlinux, where only after we load all the
217 * symbols we'll know where it starts and ends.
219 struct map *map__new2(u64 start, struct dso *dso)
224 map = calloc(1, sizeof(*map) + (dso__kernel(dso) ? sizeof(struct kmap) : 0));
225 if (ADD_RC_CHK(result, map)) {
227 * ->end will be filled after we load all the symbols
229 map__init(result, start, 0, 0, dso);
235 bool __map__is_kernel(const struct map *map)
237 if (!dso__kernel(map__dso(map)))
239 return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;
242 bool __map__is_extra_kernel_map(const struct map *map)
244 struct kmap *kmap = __map__kmap((struct map *)map);
246 return kmap && kmap->name[0];
249 bool __map__is_bpf_prog(const struct map *map)
252 struct dso *dso = map__dso(map);
254 if (dso__binary_type(dso) == DSO_BINARY_TYPE__BPF_PROG_INFO)
258 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
259 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
260 * guess the type based on name.
262 name = dso__short_name(dso);
263 return name && (strstr(name, "bpf_prog_") == name);
266 bool __map__is_bpf_image(const struct map *map)
269 struct dso *dso = map__dso(map);
271 if (dso__binary_type(dso) == DSO_BINARY_TYPE__BPF_IMAGE)
275 * If PERF_RECORD_KSYMBOL is not included, the dso will not have
276 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
277 * guess the type based on name.
279 name = dso__short_name(dso);
280 return name && is_bpf_image(name);
283 bool __map__is_ool(const struct map *map)
285 const struct dso *dso = map__dso(map);
287 return dso && dso__binary_type(dso) == DSO_BINARY_TYPE__OOL;
290 bool map__has_symbols(const struct map *map)
292 return dso__has_symbols(map__dso(map));
295 static void map__exit(struct map *map)
297 BUG_ON(refcount_read(map__refcnt(map)) != 0);
298 dso__zput(RC_CHK_ACCESS(map)->dso);
301 void map__delete(struct map *map)
307 void map__put(struct map *map)
309 if (map && refcount_dec_and_test(map__refcnt(map)))
315 void map__fixup_start(struct map *map)
317 struct dso *dso = map__dso(map);
318 struct rb_root_cached *symbols = dso__symbols(dso);
319 struct rb_node *nd = rb_first_cached(symbols);
322 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
324 map__set_start(map, sym->start);
328 void map__fixup_end(struct map *map)
330 struct dso *dso = map__dso(map);
331 struct rb_root_cached *symbols = dso__symbols(dso);
332 struct rb_node *nd = rb_last(&symbols->rb_root);
335 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
336 map__set_end(map, sym->end);
340 #define DSO__DELETED "(deleted)"
342 int map__load(struct map *map)
344 struct dso *dso = map__dso(map);
345 const char *name = dso__long_name(dso);
348 if (dso__loaded(dso))
351 nr = dso__load(dso, map);
353 if (dso__has_build_id(dso)) {
354 char sbuild_id[SBUILD_ID_SIZE];
356 build_id__sprintf(dso__bid(dso), sbuild_id);
357 pr_debug("%s with build id %s not found", name, sbuild_id);
359 pr_debug("Failed to open %s", name);
361 pr_debug(", continuing without symbols\n");
363 } else if (nr == 0) {
364 #ifdef HAVE_LIBELF_SUPPORT
365 const size_t len = strlen(name);
366 const size_t real_len = len - sizeof(DSO__DELETED);
368 if (len > sizeof(DSO__DELETED) &&
369 strcmp(name + real_len + 1, DSO__DELETED) == 0) {
370 pr_debug("%.*s was updated (is prelink enabled?). "
371 "Restart the long running apps that use it!\n",
372 (int)real_len, name);
374 pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
383 struct symbol *map__find_symbol(struct map *map, u64 addr)
385 if (map__load(map) < 0)
388 return dso__find_symbol(map__dso(map), addr);
391 struct symbol *map__find_symbol_by_name_idx(struct map *map, const char *name, size_t *idx)
395 if (map__load(map) < 0)
399 dso__sort_by_name(dso);
401 return dso__find_symbol_by_name(dso, name, idx);
404 struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
408 return map__find_symbol_by_name_idx(map, name, &idx);
411 struct map *map__clone(struct map *from)
415 size_t size = sizeof(RC_STRUCT(map));
416 struct dso *dso = map__dso(from);
418 if (dso && dso__kernel(dso))
419 size += sizeof(struct kmap);
421 map = memdup(RC_CHK_ACCESS(from), size);
422 if (ADD_RC_CHK(result, map)) {
423 refcount_set(&map->refcnt, 1);
424 map->dso = dso__get(dso);
430 size_t map__fprintf(struct map *map, FILE *fp)
432 const struct dso *dso = map__dso(map);
434 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
435 map__start(map), map__end(map), map__pgoff(map), dso__name(dso));
438 static bool prefer_dso_long_name(const struct dso *dso, bool print_off)
440 return dso__long_name(dso) &&
441 (symbol_conf.show_kernel_path ||
442 (print_off && (dso__name(dso)[0] == '[' || dso__is_kcore(dso))));
445 static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp)
447 char buf[symbol_conf.pad_output_len_dso + 1];
448 const char *dsoname = "[unknown]";
449 const struct dso *dso = map ? map__dso(map) : NULL;
452 if (prefer_dso_long_name(dso, print_off))
453 dsoname = dso__long_name(dso);
455 dsoname = dso__name(dso);
458 if (symbol_conf.pad_output_len_dso) {
459 scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
463 return fprintf(fp, "%s", dsoname);
466 size_t map__fprintf_dsoname(struct map *map, FILE *fp)
468 return __map__fprintf_dsoname(map, false, fp);
471 size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp)
473 const struct dso *dso = map ? map__dso(map) : NULL;
476 if (print_off && (!dso || !dso__is_object_file(dso)))
478 printed += fprintf(fp, " (");
479 printed += __map__fprintf_dsoname(map, print_off, fp);
481 printed += fprintf(fp, "+0x%" PRIx64, addr);
482 printed += fprintf(fp, ")");
487 char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
490 return SRCLINE_UNKNOWN;
492 return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr);
495 int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
498 const struct dso *dso = map ? map__dso(map) : NULL;
502 char *srcline = map__srcline(map, addr, NULL);
503 if (srcline != SRCLINE_UNKNOWN)
504 ret = fprintf(fp, "%s%s", prefix, srcline);
505 zfree_srcline(&srcline);
510 void srccode_state_free(struct srccode_state *state)
512 zfree(&state->srcfile);
517 * map__rip_2objdump - convert symbol start address to objdump address.
519 * @rip: symbol start address
521 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
522 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
523 * relative to section start.
525 * Return: Address suitable for passing to "objdump --start-address="
527 u64 map__rip_2objdump(struct map *map, u64 rip)
529 struct kmap *kmap = __map__kmap(map);
530 const struct dso *dso = map__dso(map);
533 * vmlinux does not have program headers for PTI entry trampolines and
534 * kcore may not either. However the trampoline object code is on the
535 * main kernel map, so just use that instead.
537 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps) {
538 struct machine *machine = maps__machine(kmap->kmaps);
541 struct map *kernel_map = machine__kernel_map(machine);
548 if (!dso__adjust_symbols(dso))
552 return rip - map__pgoff(map);
554 if (dso__kernel(dso) == DSO_SPACE__USER)
555 return rip + dso__text_offset(dso);
557 return map__unmap_ip(map, rip) - map__reloc(map);
561 * map__objdump_2mem - convert objdump address to a memory address.
563 * @ip: objdump address
565 * Closely related to map__rip_2objdump(), this function takes an address from
566 * objdump and converts it to a memory address. Note this assumes that @map
567 * contains the address. To be sure the result is valid, check it forwards
568 * e.g. map__rip_2objdump(map__map_ip(map, map__objdump_2mem(map, ip))) == ip
570 * Return: Memory address.
572 u64 map__objdump_2mem(struct map *map, u64 ip)
574 const struct dso *dso = map__dso(map);
576 if (!dso__adjust_symbols(dso))
577 return map__unmap_ip(map, ip);
580 return map__unmap_ip(map, ip + map__pgoff(map));
582 if (dso__kernel(dso) == DSO_SPACE__USER)
583 return map__unmap_ip(map, ip - dso__text_offset(dso));
585 return ip + map__reloc(map);
588 /* convert objdump address to relative address. (To be removed) */
589 u64 map__objdump_2rip(struct map *map, u64 ip)
591 const struct dso *dso = map__dso(map);
593 if (!dso__adjust_symbols(dso))
597 return ip + map__pgoff(map);
599 if (dso__kernel(dso) == DSO_SPACE__USER)
600 return ip - dso__text_offset(dso);
602 return map__map_ip(map, ip + map__reloc(map));
605 bool map__contains_symbol(const struct map *map, const struct symbol *sym)
607 u64 ip = map__unmap_ip(map, sym->start);
609 return ip >= map__start(map) && ip < map__end(map);
612 struct kmap *__map__kmap(struct map *map)
614 const struct dso *dso = map__dso(map);
616 if (!dso || !dso__kernel(dso))
618 return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
621 struct kmap *map__kmap(struct map *map)
623 struct kmap *kmap = __map__kmap(map);
626 pr_err("Internal error: map__kmap with a non-kernel map\n");
630 struct maps *map__kmaps(struct map *map)
632 struct kmap *kmap = map__kmap(map);
634 if (!kmap || !kmap->kmaps) {
635 pr_err("Internal error: map__kmaps with a non-kernel map\n");