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1// SPDX-License-Identifier: GPL-2.0
2#include <inttypes.h>
3#include <limits.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <string.h>
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 */
10#include "debug.h"
11#include "dso.h"
12#include "map.h"
13#include "namespaces.h"
14#include "srcline.h"
15#include "symbol.h"
16#include "thread.h"
17#include "vdso.h"
18
19static inline int is_android_lib(const char *filename)
20{
21 return strstarts(filename, "/data/app-lib/") ||
22 strstarts(filename, "/system/lib/");
23}
24
25static inline bool replace_android_lib(const char *filename, char *newfilename)
26{
27 const char *libname;
28 char *app_abi;
29 size_t app_abi_length, new_length;
30 size_t lib_length = 0;
31
32 libname = strrchr(filename, '/');
33 if (libname)
34 lib_length = strlen(libname);
35
36 app_abi = getenv("APP_ABI");
37 if (!app_abi)
38 return false;
39
40 app_abi_length = strlen(app_abi);
41
42 if (strstarts(filename, "/data/app-lib/")) {
43 char *apk_path;
44
45 if (!app_abi_length)
46 return false;
47
48 new_length = 7 + app_abi_length + lib_length;
49
50 apk_path = getenv("APK_PATH");
51 if (apk_path) {
52 new_length += strlen(apk_path) + 1;
53 if (new_length > PATH_MAX)
54 return false;
55 snprintf(newfilename, new_length,
56 "%s/libs/%s/%s", apk_path, app_abi, libname);
57 } else {
58 if (new_length > PATH_MAX)
59 return false;
60 snprintf(newfilename, new_length,
61 "libs/%s/%s", app_abi, libname);
62 }
63 return true;
64 }
65
66 if (strstarts(filename, "/system/lib/")) {
67 char *ndk, *app;
68 const char *arch;
69 int ndk_length, app_length;
70
71 ndk = getenv("NDK_ROOT");
72 app = getenv("APP_PLATFORM");
73
74 if (!(ndk && app))
75 return false;
76
77 ndk_length = strlen(ndk);
78 app_length = strlen(app);
79
80 if (!(ndk_length && app_length && app_abi_length))
81 return false;
82
83 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
84 !strncmp(app_abi, "mips", 4) ? "mips" :
85 !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
86
87 if (!arch)
88 return false;
89
90 new_length = 27 + ndk_length +
91 app_length + lib_length
92 + strlen(arch);
93
94 if (new_length > PATH_MAX)
95 return false;
96 snprintf(newfilename, new_length,
97 "%.*s/platforms/%.*s/arch-%s/usr/lib/%s",
98 ndk_length, ndk, app_length, app, arch, libname);
99
100 return true;
101 }
102 return false;
103}
104
105void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
106{
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);
115}
116
117struct 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)
121{
122 struct map *result;
123 RC_STRUCT(map) *map;
124 struct nsinfo *nsi = NULL;
125 struct nsinfo *nnsi;
126
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;
132
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);
137 map->prot = prot;
138 map->flags = flags;
139 nsi = nsinfo__get(thread__nsinfo(thread));
140
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;
145 }
146
147 if (android) {
148 if (replace_android_lib(filename, newfilename))
149 filename = newfilename;
150 }
151
152 if (vdso) {
153 /* The vdso maps are always on the host and not the
154 * container. Ensure that we don't use setns to look
155 * them up.
156 */
157 nnsi = nsinfo__copy(nsi);
158 if (nnsi) {
159 nsinfo__put(nsi);
160 nsinfo__clear_need_setns(nnsi);
161 nsi = nnsi;
162 }
163 pgoff = 0;
164 dso = machine__findnew_vdso(machine, thread);
165 } else
166 dso = machine__findnew_dso_id(machine, filename, id);
167
168 if (dso == NULL)
169 goto out_delete;
170
171 map__init(result, start, start + len, pgoff, dso);
172
173 if (anon || no_dso) {
174 map->mapping_type = MAPPING_TYPE__IDENTITY;
175
176 /*
177 * Set memory without DSO as loaded. All map__find_*
178 * functions still return NULL, and we avoid the
179 * unnecessary map__load warning.
180 */
181 if (!(prot & PROT_EXEC))
182 dso__set_loaded(dso);
183 }
184 mutex_lock(&dso->lock);
185 nsinfo__put(dso->nsinfo);
186 dso->nsinfo = nsi;
187 mutex_unlock(&dso->lock);
188
189 if (build_id__is_defined(bid)) {
190 dso__set_build_id(dso, bid);
191 } else {
192 /*
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
196 * have it missing.
197 */
198 down_read(&machine->dsos.lock);
199 header_bid_dso = __dsos__find(&machine->dsos, filename, false);
200 up_read(&machine->dsos.lock);
201 if (header_bid_dso && header_bid_dso->header_build_id) {
202 dso__set_build_id(dso, &header_bid_dso->bid);
203 dso->header_build_id = 1;
204 }
205 }
206 dso__put(dso);
207 }
208 return result;
209out_delete:
210 nsinfo__put(nsi);
211 RC_CHK_FREE(result);
212 return NULL;
213}
214
215/*
216 * Constructor variant for modules (where we know from /proc/modules where
217 * they are loaded) and for vmlinux, where only after we load all the
218 * symbols we'll know where it starts and ends.
219 */
220struct map *map__new2(u64 start, struct dso *dso)
221{
222 struct map *result;
223 RC_STRUCT(map) *map;
224
225 map = calloc(1, sizeof(*map) + (dso->kernel ? sizeof(struct kmap) : 0));
226 if (ADD_RC_CHK(result, map)) {
227 /*
228 * ->end will be filled after we load all the symbols
229 */
230 map__init(result, start, 0, 0, dso);
231 }
232
233 return result;
234}
235
236bool __map__is_kernel(const struct map *map)
237{
238 if (!map__dso(map)->kernel)
239 return false;
240 return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;
241}
242
243bool __map__is_extra_kernel_map(const struct map *map)
244{
245 struct kmap *kmap = __map__kmap((struct map *)map);
246
247 return kmap && kmap->name[0];
248}
249
250bool __map__is_bpf_prog(const struct map *map)
251{
252 const char *name;
253 struct dso *dso = map__dso(map);
254
255 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
256 return true;
257
258 /*
259 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
260 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
261 * guess the type based on name.
262 */
263 name = dso->short_name;
264 return name && (strstr(name, "bpf_prog_") == name);
265}
266
267bool __map__is_bpf_image(const struct map *map)
268{
269 const char *name;
270 struct dso *dso = map__dso(map);
271
272 if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
273 return true;
274
275 /*
276 * If PERF_RECORD_KSYMBOL is not included, the dso will not have
277 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
278 * guess the type based on name.
279 */
280 name = dso->short_name;
281 return name && is_bpf_image(name);
282}
283
284bool __map__is_ool(const struct map *map)
285{
286 const struct dso *dso = map__dso(map);
287
288 return dso && dso->binary_type == DSO_BINARY_TYPE__OOL;
289}
290
291bool map__has_symbols(const struct map *map)
292{
293 return dso__has_symbols(map__dso(map));
294}
295
296static void map__exit(struct map *map)
297{
298 BUG_ON(refcount_read(map__refcnt(map)) != 0);
299 dso__zput(RC_CHK_ACCESS(map)->dso);
300}
301
302void map__delete(struct map *map)
303{
304 map__exit(map);
305 RC_CHK_FREE(map);
306}
307
308void map__put(struct map *map)
309{
310 if (map && refcount_dec_and_test(map__refcnt(map)))
311 map__delete(map);
312 else
313 RC_CHK_PUT(map);
314}
315
316void map__fixup_start(struct map *map)
317{
318 struct dso *dso = map__dso(map);
319 struct rb_root_cached *symbols = &dso->symbols;
320 struct rb_node *nd = rb_first_cached(symbols);
321
322 if (nd != NULL) {
323 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
324
325 map__set_start(map, sym->start);
326 }
327}
328
329void map__fixup_end(struct map *map)
330{
331 struct dso *dso = map__dso(map);
332 struct rb_root_cached *symbols = &dso->symbols;
333 struct rb_node *nd = rb_last(&symbols->rb_root);
334
335 if (nd != NULL) {
336 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
337 map__set_end(map, sym->end);
338 }
339}
340
341#define DSO__DELETED "(deleted)"
342
343int map__load(struct map *map)
344{
345 struct dso *dso = map__dso(map);
346 const char *name = dso->long_name;
347 int nr;
348
349 if (dso__loaded(dso))
350 return 0;
351
352 nr = dso__load(dso, map);
353 if (nr < 0) {
354 if (dso->has_build_id) {
355 char sbuild_id[SBUILD_ID_SIZE];
356
357 build_id__sprintf(&dso->bid, sbuild_id);
358 pr_debug("%s with build id %s not found", name, sbuild_id);
359 } else
360 pr_debug("Failed to open %s", name);
361
362 pr_debug(", continuing without symbols\n");
363 return -1;
364 } else if (nr == 0) {
365#ifdef HAVE_LIBELF_SUPPORT
366 const size_t len = strlen(name);
367 const size_t real_len = len - sizeof(DSO__DELETED);
368
369 if (len > sizeof(DSO__DELETED) &&
370 strcmp(name + real_len + 1, DSO__DELETED) == 0) {
371 pr_debug("%.*s was updated (is prelink enabled?). "
372 "Restart the long running apps that use it!\n",
373 (int)real_len, name);
374 } else {
375 pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
376 }
377#endif
378 return -1;
379 }
380
381 return 0;
382}
383
384struct symbol *map__find_symbol(struct map *map, u64 addr)
385{
386 if (map__load(map) < 0)
387 return NULL;
388
389 return dso__find_symbol(map__dso(map), addr);
390}
391
392struct symbol *map__find_symbol_by_name_idx(struct map *map, const char *name, size_t *idx)
393{
394 struct dso *dso;
395
396 if (map__load(map) < 0)
397 return NULL;
398
399 dso = map__dso(map);
400 dso__sort_by_name(dso);
401
402 return dso__find_symbol_by_name(dso, name, idx);
403}
404
405struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
406{
407 size_t idx;
408
409 return map__find_symbol_by_name_idx(map, name, &idx);
410}
411
412struct map *map__clone(struct map *from)
413{
414 struct map *result;
415 RC_STRUCT(map) *map;
416 size_t size = sizeof(RC_STRUCT(map));
417 struct dso *dso = map__dso(from);
418
419 if (dso && dso->kernel)
420 size += sizeof(struct kmap);
421
422 map = memdup(RC_CHK_ACCESS(from), size);
423 if (ADD_RC_CHK(result, map)) {
424 refcount_set(&map->refcnt, 1);
425 map->dso = dso__get(dso);
426 }
427
428 return result;
429}
430
431size_t map__fprintf(struct map *map, FILE *fp)
432{
433 const struct dso *dso = map__dso(map);
434
435 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
436 map__start(map), map__end(map), map__pgoff(map), dso->name);
437}
438
439static bool prefer_dso_long_name(const struct dso *dso, bool print_off)
440{
441 return dso->long_name &&
442 (symbol_conf.show_kernel_path ||
443 (print_off && (dso->name[0] == '[' || dso__is_kcore(dso))));
444}
445
446static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp)
447{
448 char buf[symbol_conf.pad_output_len_dso + 1];
449 const char *dsoname = "[unknown]";
450 const struct dso *dso = map ? map__dso(map) : NULL;
451
452 if (dso) {
453 if (prefer_dso_long_name(dso, print_off))
454 dsoname = dso->long_name;
455 else
456 dsoname = dso->name;
457 }
458
459 if (symbol_conf.pad_output_len_dso) {
460 scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
461 dsoname = buf;
462 }
463
464 return fprintf(fp, "%s", dsoname);
465}
466
467size_t map__fprintf_dsoname(struct map *map, FILE *fp)
468{
469 return __map__fprintf_dsoname(map, false, fp);
470}
471
472size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp)
473{
474 const struct dso *dso = map ? map__dso(map) : NULL;
475 int printed = 0;
476
477 if (print_off && (!dso || !dso__is_object_file(dso)))
478 print_off = false;
479 printed += fprintf(fp, " (");
480 printed += __map__fprintf_dsoname(map, print_off, fp);
481 if (print_off)
482 printed += fprintf(fp, "+0x%" PRIx64, addr);
483 printed += fprintf(fp, ")");
484
485 return printed;
486}
487
488char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
489{
490 if (map == NULL)
491 return SRCLINE_UNKNOWN;
492
493 return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr);
494}
495
496int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
497 FILE *fp)
498{
499 const struct dso *dso = map ? map__dso(map) : NULL;
500 int ret = 0;
501
502 if (dso) {
503 char *srcline = map__srcline(map, addr, NULL);
504 if (srcline != SRCLINE_UNKNOWN)
505 ret = fprintf(fp, "%s%s", prefix, srcline);
506 zfree_srcline(&srcline);
507 }
508 return ret;
509}
510
511void srccode_state_free(struct srccode_state *state)
512{
513 zfree(&state->srcfile);
514 state->line = 0;
515}
516
517/**
518 * map__rip_2objdump - convert symbol start address to objdump address.
519 * @map: memory map
520 * @rip: symbol start address
521 *
522 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
523 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
524 * relative to section start.
525 *
526 * Return: Address suitable for passing to "objdump --start-address="
527 */
528u64 map__rip_2objdump(struct map *map, u64 rip)
529{
530 struct kmap *kmap = __map__kmap(map);
531 const struct dso *dso = map__dso(map);
532
533 /*
534 * vmlinux does not have program headers for PTI entry trampolines and
535 * kcore may not either. However the trampoline object code is on the
536 * main kernel map, so just use that instead.
537 */
538 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps) {
539 struct machine *machine = maps__machine(kmap->kmaps);
540
541 if (machine) {
542 struct map *kernel_map = machine__kernel_map(machine);
543
544 if (kernel_map)
545 map = kernel_map;
546 }
547 }
548
549 if (!dso->adjust_symbols)
550 return rip;
551
552 if (dso->rel)
553 return rip - map__pgoff(map);
554
555 /*
556 * kernel modules also have DSO_TYPE_USER in dso->kernel,
557 * but all kernel modules are ET_REL, so won't get here.
558 */
559 if (dso->kernel == DSO_SPACE__USER)
560 return rip + dso->text_offset;
561
562 return map__unmap_ip(map, rip) - map__reloc(map);
563}
564
565/**
566 * map__objdump_2mem - convert objdump address to a memory address.
567 * @map: memory map
568 * @ip: objdump address
569 *
570 * Closely related to map__rip_2objdump(), this function takes an address from
571 * objdump and converts it to a memory address. Note this assumes that @map
572 * contains the address. To be sure the result is valid, check it forwards
573 * e.g. map__rip_2objdump(map__map_ip(map, map__objdump_2mem(map, ip))) == ip
574 *
575 * Return: Memory address.
576 */
577u64 map__objdump_2mem(struct map *map, u64 ip)
578{
579 const struct dso *dso = map__dso(map);
580
581 if (!dso->adjust_symbols)
582 return map__unmap_ip(map, ip);
583
584 if (dso->rel)
585 return map__unmap_ip(map, ip + map__pgoff(map));
586
587 /*
588 * kernel modules also have DSO_TYPE_USER in dso->kernel,
589 * but all kernel modules are ET_REL, so won't get here.
590 */
591 if (dso->kernel == DSO_SPACE__USER)
592 return map__unmap_ip(map, ip - dso->text_offset);
593
594 return ip + map__reloc(map);
595}
596
597bool map__contains_symbol(const struct map *map, const struct symbol *sym)
598{
599 u64 ip = map__unmap_ip(map, sym->start);
600
601 return ip >= map__start(map) && ip < map__end(map);
602}
603
604struct kmap *__map__kmap(struct map *map)
605{
606 const struct dso *dso = map__dso(map);
607
608 if (!dso || !dso->kernel)
609 return NULL;
610 return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
611}
612
613struct kmap *map__kmap(struct map *map)
614{
615 struct kmap *kmap = __map__kmap(map);
616
617 if (!kmap)
618 pr_err("Internal error: map__kmap with a non-kernel map\n");
619 return kmap;
620}
621
622struct maps *map__kmaps(struct map *map)
623{
624 struct kmap *kmap = map__kmap(map);
625
626 if (!kmap || !kmap->kmaps) {
627 pr_err("Internal error: map__kmaps with a non-kernel map\n");
628 return NULL;
629 }
630 return kmap->kmaps;
631}
1// SPDX-License-Identifier: GPL-2.0
2#include <inttypes.h>
3#include <limits.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <string.h>
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 */
10#include "debug.h"
11#include "dso.h"
12#include "map.h"
13#include "namespaces.h"
14#include "srcline.h"
15#include "symbol.h"
16#include "thread.h"
17#include "vdso.h"
18
19static inline int is_android_lib(const char *filename)
20{
21 return strstarts(filename, "/data/app-lib/") ||
22 strstarts(filename, "/system/lib/");
23}
24
25static inline bool replace_android_lib(const char *filename, char *newfilename)
26{
27 const char *libname;
28 char *app_abi;
29 size_t app_abi_length, new_length;
30 size_t lib_length = 0;
31
32 libname = strrchr(filename, '/');
33 if (libname)
34 lib_length = strlen(libname);
35
36 app_abi = getenv("APP_ABI");
37 if (!app_abi)
38 return false;
39
40 app_abi_length = strlen(app_abi);
41
42 if (strstarts(filename, "/data/app-lib/")) {
43 char *apk_path;
44
45 if (!app_abi_length)
46 return false;
47
48 new_length = 7 + app_abi_length + lib_length;
49
50 apk_path = getenv("APK_PATH");
51 if (apk_path) {
52 new_length += strlen(apk_path) + 1;
53 if (new_length > PATH_MAX)
54 return false;
55 snprintf(newfilename, new_length,
56 "%s/libs/%s/%s", apk_path, app_abi, libname);
57 } else {
58 if (new_length > PATH_MAX)
59 return false;
60 snprintf(newfilename, new_length,
61 "libs/%s/%s", app_abi, libname);
62 }
63 return true;
64 }
65
66 if (strstarts(filename, "/system/lib/")) {
67 char *ndk, *app;
68 const char *arch;
69 int ndk_length, app_length;
70
71 ndk = getenv("NDK_ROOT");
72 app = getenv("APP_PLATFORM");
73
74 if (!(ndk && app))
75 return false;
76
77 ndk_length = strlen(ndk);
78 app_length = strlen(app);
79
80 if (!(ndk_length && app_length && app_abi_length))
81 return false;
82
83 arch = !strncmp(app_abi, "arm", 3) ? "arm" :
84 !strncmp(app_abi, "mips", 4) ? "mips" :
85 !strncmp(app_abi, "x86", 3) ? "x86" : NULL;
86
87 if (!arch)
88 return false;
89
90 new_length = 27 + ndk_length +
91 app_length + lib_length
92 + strlen(arch);
93
94 if (new_length > PATH_MAX)
95 return false;
96 snprintf(newfilename, new_length,
97 "%.*s/platforms/%.*s/arch-%s/usr/lib/%s",
98 ndk_length, ndk, app_length, app, arch, libname);
99
100 return true;
101 }
102 return false;
103}
104
105void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
106{
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);
115}
116
117struct 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)
121{
122 struct map *result;
123 RC_STRUCT(map) *map;
124 struct nsinfo *nsi = NULL;
125 struct nsinfo *nnsi;
126
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;
132
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);
137 map->prot = prot;
138 map->flags = flags;
139 nsi = nsinfo__get(thread__nsinfo(thread));
140
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;
145 }
146
147 if (android) {
148 if (replace_android_lib(filename, newfilename))
149 filename = newfilename;
150 }
151
152 if (vdso) {
153 /* The vdso maps are always on the host and not the
154 * container. Ensure that we don't use setns to look
155 * them up.
156 */
157 nnsi = nsinfo__copy(nsi);
158 if (nnsi) {
159 nsinfo__put(nsi);
160 nsinfo__clear_need_setns(nnsi);
161 nsi = nnsi;
162 }
163 pgoff = 0;
164 dso = machine__findnew_vdso(machine, thread);
165 } else
166 dso = machine__findnew_dso_id(machine, filename, id);
167
168 if (dso == NULL)
169 goto out_delete;
170
171 assert(!dso->kernel);
172 map__init(result, start, start + len, pgoff, dso);
173
174 if (anon || no_dso) {
175 map->mapping_type = MAPPING_TYPE__IDENTITY;
176
177 /*
178 * Set memory without DSO as loaded. All map__find_*
179 * functions still return NULL, and we avoid the
180 * unnecessary map__load warning.
181 */
182 if (!(prot & PROT_EXEC))
183 dso__set_loaded(dso);
184 }
185 mutex_lock(&dso->lock);
186 nsinfo__put(dso->nsinfo);
187 dso->nsinfo = nsi;
188 mutex_unlock(&dso->lock);
189
190 if (build_id__is_defined(bid)) {
191 dso__set_build_id(dso, bid);
192 } else {
193 /*
194 * If the mmap event had no build ID, search for an existing dso from the
195 * build ID header by name. Otherwise only the dso loaded at the time of
196 * reading the header will have the build ID set and all future mmaps will
197 * have it missing.
198 */
199 down_read(&machine->dsos.lock);
200 header_bid_dso = __dsos__find(&machine->dsos, filename, false);
201 up_read(&machine->dsos.lock);
202 if (header_bid_dso && header_bid_dso->header_build_id) {
203 dso__set_build_id(dso, &header_bid_dso->bid);
204 dso->header_build_id = 1;
205 }
206 }
207 dso__put(dso);
208 }
209 return result;
210out_delete:
211 nsinfo__put(nsi);
212 RC_CHK_FREE(result);
213 return NULL;
214}
215
216/*
217 * Constructor variant for modules (where we know from /proc/modules where
218 * they are loaded) and for vmlinux, where only after we load all the
219 * symbols we'll know where it starts and ends.
220 */
221struct map *map__new2(u64 start, struct dso *dso)
222{
223 struct map *result;
224 RC_STRUCT(map) *map;
225
226 map = calloc(1, sizeof(*map) + (dso->kernel ? sizeof(struct kmap) : 0));
227 if (ADD_RC_CHK(result, map)) {
228 /*
229 * ->end will be filled after we load all the symbols
230 */
231 map__init(result, start, 0, 0, dso);
232 }
233
234 return result;
235}
236
237bool __map__is_kernel(const struct map *map)
238{
239 if (!map__dso(map)->kernel)
240 return false;
241 return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;
242}
243
244bool __map__is_extra_kernel_map(const struct map *map)
245{
246 struct kmap *kmap = __map__kmap((struct map *)map);
247
248 return kmap && kmap->name[0];
249}
250
251bool __map__is_bpf_prog(const struct map *map)
252{
253 const char *name;
254 struct dso *dso = map__dso(map);
255
256 if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
257 return true;
258
259 /*
260 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
261 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
262 * guess the type based on name.
263 */
264 name = dso->short_name;
265 return name && (strstr(name, "bpf_prog_") == name);
266}
267
268bool __map__is_bpf_image(const struct map *map)
269{
270 const char *name;
271 struct dso *dso = map__dso(map);
272
273 if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
274 return true;
275
276 /*
277 * If PERF_RECORD_KSYMBOL is not included, the dso will not have
278 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
279 * guess the type based on name.
280 */
281 name = dso->short_name;
282 return name && is_bpf_image(name);
283}
284
285bool __map__is_ool(const struct map *map)
286{
287 const struct dso *dso = map__dso(map);
288
289 return dso && dso->binary_type == DSO_BINARY_TYPE__OOL;
290}
291
292bool map__has_symbols(const struct map *map)
293{
294 return dso__has_symbols(map__dso(map));
295}
296
297static void map__exit(struct map *map)
298{
299 BUG_ON(refcount_read(map__refcnt(map)) != 0);
300 dso__zput(RC_CHK_ACCESS(map)->dso);
301}
302
303void map__delete(struct map *map)
304{
305 map__exit(map);
306 RC_CHK_FREE(map);
307}
308
309void map__put(struct map *map)
310{
311 if (map && refcount_dec_and_test(map__refcnt(map)))
312 map__delete(map);
313 else
314 RC_CHK_PUT(map);
315}
316
317void map__fixup_start(struct map *map)
318{
319 struct dso *dso = map__dso(map);
320 struct rb_root_cached *symbols = &dso->symbols;
321 struct rb_node *nd = rb_first_cached(symbols);
322
323 if (nd != NULL) {
324 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
325
326 map__set_start(map, sym->start);
327 }
328}
329
330void map__fixup_end(struct map *map)
331{
332 struct dso *dso = map__dso(map);
333 struct rb_root_cached *symbols = &dso->symbols;
334 struct rb_node *nd = rb_last(&symbols->rb_root);
335
336 if (nd != NULL) {
337 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
338 map__set_end(map, sym->end);
339 }
340}
341
342#define DSO__DELETED "(deleted)"
343
344int map__load(struct map *map)
345{
346 struct dso *dso = map__dso(map);
347 const char *name = dso->long_name;
348 int nr;
349
350 if (dso__loaded(dso))
351 return 0;
352
353 nr = dso__load(dso, map);
354 if (nr < 0) {
355 if (dso->has_build_id) {
356 char sbuild_id[SBUILD_ID_SIZE];
357
358 build_id__sprintf(&dso->bid, sbuild_id);
359 pr_debug("%s with build id %s not found", name, sbuild_id);
360 } else
361 pr_debug("Failed to open %s", name);
362
363 pr_debug(", continuing without symbols\n");
364 return -1;
365 } else if (nr == 0) {
366#ifdef HAVE_LIBELF_SUPPORT
367 const size_t len = strlen(name);
368 const size_t real_len = len - sizeof(DSO__DELETED);
369
370 if (len > sizeof(DSO__DELETED) &&
371 strcmp(name + real_len + 1, DSO__DELETED) == 0) {
372 pr_debug("%.*s was updated (is prelink enabled?). "
373 "Restart the long running apps that use it!\n",
374 (int)real_len, name);
375 } else {
376 pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
377 }
378#endif
379 return -1;
380 }
381
382 return 0;
383}
384
385struct symbol *map__find_symbol(struct map *map, u64 addr)
386{
387 if (map__load(map) < 0)
388 return NULL;
389
390 return dso__find_symbol(map__dso(map), addr);
391}
392
393struct symbol *map__find_symbol_by_name_idx(struct map *map, const char *name, size_t *idx)
394{
395 struct dso *dso;
396
397 if (map__load(map) < 0)
398 return NULL;
399
400 dso = map__dso(map);
401 dso__sort_by_name(dso);
402
403 return dso__find_symbol_by_name(dso, name, idx);
404}
405
406struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
407{
408 size_t idx;
409
410 return map__find_symbol_by_name_idx(map, name, &idx);
411}
412
413struct map *map__clone(struct map *from)
414{
415 struct map *result;
416 RC_STRUCT(map) *map;
417 size_t size = sizeof(RC_STRUCT(map));
418 struct dso *dso = map__dso(from);
419
420 if (dso && dso->kernel)
421 size += sizeof(struct kmap);
422
423 map = memdup(RC_CHK_ACCESS(from), size);
424 if (ADD_RC_CHK(result, map)) {
425 refcount_set(&map->refcnt, 1);
426 map->dso = dso__get(dso);
427 }
428
429 return result;
430}
431
432size_t map__fprintf(struct map *map, FILE *fp)
433{
434 const struct dso *dso = map__dso(map);
435
436 return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
437 map__start(map), map__end(map), map__pgoff(map), dso->name);
438}
439
440static bool prefer_dso_long_name(const struct dso *dso, bool print_off)
441{
442 return dso->long_name &&
443 (symbol_conf.show_kernel_path ||
444 (print_off && (dso->name[0] == '[' || dso__is_kcore(dso))));
445}
446
447static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp)
448{
449 char buf[symbol_conf.pad_output_len_dso + 1];
450 const char *dsoname = "[unknown]";
451 const struct dso *dso = map ? map__dso(map) : NULL;
452
453 if (dso) {
454 if (prefer_dso_long_name(dso, print_off))
455 dsoname = dso->long_name;
456 else
457 dsoname = dso->name;
458 }
459
460 if (symbol_conf.pad_output_len_dso) {
461 scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
462 dsoname = buf;
463 }
464
465 return fprintf(fp, "%s", dsoname);
466}
467
468size_t map__fprintf_dsoname(struct map *map, FILE *fp)
469{
470 return __map__fprintf_dsoname(map, false, fp);
471}
472
473size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp)
474{
475 const struct dso *dso = map ? map__dso(map) : NULL;
476 int printed = 0;
477
478 if (print_off && (!dso || !dso__is_object_file(dso)))
479 print_off = false;
480 printed += fprintf(fp, " (");
481 printed += __map__fprintf_dsoname(map, print_off, fp);
482 if (print_off)
483 printed += fprintf(fp, "+0x%" PRIx64, addr);
484 printed += fprintf(fp, ")");
485
486 return printed;
487}
488
489char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
490{
491 if (map == NULL)
492 return SRCLINE_UNKNOWN;
493
494 return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr);
495}
496
497int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
498 FILE *fp)
499{
500 const struct dso *dso = map ? map__dso(map) : NULL;
501 int ret = 0;
502
503 if (dso) {
504 char *srcline = map__srcline(map, addr, NULL);
505 if (srcline != SRCLINE_UNKNOWN)
506 ret = fprintf(fp, "%s%s", prefix, srcline);
507 zfree_srcline(&srcline);
508 }
509 return ret;
510}
511
512void srccode_state_free(struct srccode_state *state)
513{
514 zfree(&state->srcfile);
515 state->line = 0;
516}
517
518/**
519 * map__rip_2objdump - convert symbol start address to objdump address.
520 * @map: memory map
521 * @rip: symbol start address
522 *
523 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
524 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
525 * relative to section start.
526 *
527 * Return: Address suitable for passing to "objdump --start-address="
528 */
529u64 map__rip_2objdump(struct map *map, u64 rip)
530{
531 struct kmap *kmap = __map__kmap(map);
532 const struct dso *dso = map__dso(map);
533
534 /*
535 * vmlinux does not have program headers for PTI entry trampolines and
536 * kcore may not either. However the trampoline object code is on the
537 * main kernel map, so just use that instead.
538 */
539 if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps) {
540 struct machine *machine = maps__machine(kmap->kmaps);
541
542 if (machine) {
543 struct map *kernel_map = machine__kernel_map(machine);
544
545 if (kernel_map)
546 map = kernel_map;
547 }
548 }
549
550 if (!dso->adjust_symbols)
551 return rip;
552
553 if (dso->rel)
554 return rip - map__pgoff(map);
555
556 if (dso->kernel == DSO_SPACE__USER)
557 return rip + dso->text_offset;
558
559 return map__unmap_ip(map, rip) - map__reloc(map);
560}
561
562/**
563 * map__objdump_2mem - convert objdump address to a memory address.
564 * @map: memory map
565 * @ip: objdump address
566 *
567 * Closely related to map__rip_2objdump(), this function takes an address from
568 * objdump and converts it to a memory address. Note this assumes that @map
569 * contains the address. To be sure the result is valid, check it forwards
570 * e.g. map__rip_2objdump(map__map_ip(map, map__objdump_2mem(map, ip))) == ip
571 *
572 * Return: Memory address.
573 */
574u64 map__objdump_2mem(struct map *map, u64 ip)
575{
576 const struct dso *dso = map__dso(map);
577
578 if (!dso->adjust_symbols)
579 return map__unmap_ip(map, ip);
580
581 if (dso->rel)
582 return map__unmap_ip(map, ip + map__pgoff(map));
583
584 if (dso->kernel == DSO_SPACE__USER)
585 return map__unmap_ip(map, ip - dso->text_offset);
586
587 return ip + map__reloc(map);
588}
589
590bool map__contains_symbol(const struct map *map, const struct symbol *sym)
591{
592 u64 ip = map__unmap_ip(map, sym->start);
593
594 return ip >= map__start(map) && ip < map__end(map);
595}
596
597struct kmap *__map__kmap(struct map *map)
598{
599 const struct dso *dso = map__dso(map);
600
601 if (!dso || !dso->kernel)
602 return NULL;
603 return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
604}
605
606struct kmap *map__kmap(struct map *map)
607{
608 struct kmap *kmap = __map__kmap(map);
609
610 if (!kmap)
611 pr_err("Internal error: map__kmap with a non-kernel map\n");
612 return kmap;
613}
614
615struct maps *map__kmaps(struct map *map)
616{
617 struct kmap *kmap = map__kmap(map);
618
619 if (!kmap || !kmap->kmaps) {
620 pr_err("Internal error: map__kmaps with a non-kernel map\n");
621 return NULL;
622 }
623 return kmap->kmaps;
624}