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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7b2567c1 ACM |
2 | /* |
3 | * build-id.c | |
4 | * | |
5 | * build-id support | |
6 | * | |
7 | * Copyright (C) 2009, 2010 Red Hat Inc. | |
8 | * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | */ | |
b36f19d5 | 10 | #include "util.h" |
76b31a29 | 11 | #include <dirent.h> |
a43783ae | 12 | #include <errno.h> |
b36f19d5 | 13 | #include <stdio.h> |
7a8ef4c4 ACM |
14 | #include <sys/stat.h> |
15 | #include <sys/types.h> | |
7b2567c1 ACM |
16 | #include "build-id.h" |
17 | #include "event.h" | |
40f3b2d2 | 18 | #include "namespaces.h" |
1101f69a | 19 | #include "map.h" |
7b2567c1 | 20 | #include "symbol.h" |
e7ff8920 | 21 | #include "thread.h" |
7b2567c1 | 22 | #include <linux/kernel.h> |
591765fd | 23 | #include "debug.h" |
d20deb64 | 24 | #include "session.h" |
45694aa7 | 25 | #include "tool.h" |
e195fac8 NK |
26 | #include "header.h" |
27 | #include "vdso.h" | |
9a3993d4 | 28 | #include "path.h" |
6430a94e | 29 | #include "probe-file.h" |
8ec20b17 | 30 | #include "strlist.h" |
7b2567c1 | 31 | |
3052ba56 | 32 | #include <linux/ctype.h> |
7f7c536f | 33 | #include <linux/zalloc.h> |
73c5d224 NK |
34 | |
35 | static bool no_buildid_cache; | |
36 | ||
54a3cf59 AV |
37 | int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
38 | union perf_event *event, | |
ef89325f | 39 | struct perf_sample *sample, |
32dcd021 | 40 | struct evsel *evsel __maybe_unused, |
54a3cf59 | 41 | struct machine *machine) |
7b2567c1 ACM |
42 | { |
43 | struct addr_location al; | |
ef89325f | 44 | struct thread *thread = machine__findnew_thread(machine, sample->pid, |
13ce34df | 45 | sample->tid); |
7b2567c1 ACM |
46 | |
47 | if (thread == NULL) { | |
48 | pr_err("problem processing %d event, skipping it.\n", | |
49 | event->header.type); | |
50 | return -1; | |
51 | } | |
52 | ||
71a84b5a | 53 | if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) |
7b2567c1 ACM |
54 | al.map->dso->hit = 1; |
55 | ||
b91fc39f | 56 | thread__put(thread); |
7b2567c1 ACM |
57 | return 0; |
58 | } | |
59 | ||
1d037ca1 | 60 | static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, |
d20deb64 | 61 | union perf_event *event, |
1d037ca1 IT |
62 | struct perf_sample *sample |
63 | __maybe_unused, | |
743eb868 | 64 | struct machine *machine) |
591765fd | 65 | { |
314add6b AH |
66 | struct thread *thread = machine__findnew_thread(machine, |
67 | event->fork.pid, | |
68 | event->fork.tid); | |
591765fd | 69 | |
8115d60c ACM |
70 | dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, |
71 | event->fork.ppid, event->fork.ptid); | |
591765fd | 72 | |
b91fc39f | 73 | if (thread) { |
5e78c69b | 74 | machine__remove_thread(machine, thread); |
b91fc39f ACM |
75 | thread__put(thread); |
76 | } | |
591765fd ACM |
77 | |
78 | return 0; | |
79 | } | |
80 | ||
45694aa7 | 81 | struct perf_tool build_id__mark_dso_hit_ops = { |
7b2567c1 | 82 | .sample = build_id__mark_dso_hit, |
8115d60c | 83 | .mmap = perf_event__process_mmap, |
5c5e854b | 84 | .mmap2 = perf_event__process_mmap2, |
f62d3f0f | 85 | .fork = perf_event__process_fork, |
8115d60c | 86 | .exit = perf_event__exit_del_thread, |
299c3452 SE |
87 | .attr = perf_event__process_attr, |
88 | .build_id = perf_event__process_build_id, | |
1216b65c | 89 | .ordered_events = true, |
7b2567c1 | 90 | }; |
b36f19d5 | 91 | |
ebb296c2 JO |
92 | int build_id__sprintf(const u8 *build_id, int len, char *bf) |
93 | { | |
94 | char *bid = bf; | |
95 | const u8 *raw = build_id; | |
96 | int i; | |
97 | ||
98 | for (i = 0; i < len; ++i) { | |
99 | sprintf(bid, "%02x", *raw); | |
100 | ++raw; | |
101 | bid += 2; | |
102 | } | |
103 | ||
7375e151 | 104 | return (bid - bf) + 1; |
ebb296c2 JO |
105 | } |
106 | ||
0b5a7935 MH |
107 | int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) |
108 | { | |
109 | char notes[PATH_MAX]; | |
110 | u8 build_id[BUILD_ID_SIZE]; | |
111 | int ret; | |
112 | ||
113 | if (!root_dir) | |
114 | root_dir = ""; | |
115 | ||
116 | scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); | |
117 | ||
118 | ret = sysfs__read_build_id(notes, build_id, sizeof(build_id)); | |
119 | if (ret < 0) | |
120 | return ret; | |
121 | ||
122 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
123 | } | |
124 | ||
125 | int filename__sprintf_build_id(const char *pathname, char *sbuild_id) | |
126 | { | |
127 | u8 build_id[BUILD_ID_SIZE]; | |
128 | int ret; | |
129 | ||
130 | ret = filename__read_build_id(pathname, build_id, sizeof(build_id)); | |
131 | if (ret < 0) | |
132 | return ret; | |
133 | else if (ret != sizeof(build_id)) | |
134 | return -EINVAL; | |
135 | ||
136 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
137 | } | |
138 | ||
5cb113fd MH |
139 | /* asnprintf consolidates asprintf and snprintf */ |
140 | static int asnprintf(char **strp, size_t size, const char *fmt, ...) | |
141 | { | |
142 | va_list ap; | |
143 | int ret; | |
144 | ||
145 | if (!strp) | |
146 | return -EINVAL; | |
147 | ||
148 | va_start(ap, fmt); | |
149 | if (*strp) | |
150 | ret = vsnprintf(*strp, size, fmt, ap); | |
151 | else | |
152 | ret = vasprintf(strp, fmt, ap); | |
153 | va_end(ap); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
01412261 MH |
158 | char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, |
159 | size_t size) | |
160 | { | |
01412261 MH |
161 | bool retry_old = true; |
162 | ||
c58c49ac WN |
163 | snprintf(bf, size, "%s/%s/%s/kallsyms", |
164 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
165 | retry: |
166 | if (!access(bf, F_OK)) | |
167 | return bf; | |
01412261 MH |
168 | if (retry_old) { |
169 | /* Try old style kallsyms cache */ | |
c58c49ac WN |
170 | snprintf(bf, size, "%s/%s/%s", |
171 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
172 | retry_old = false; |
173 | goto retry; | |
174 | } | |
175 | ||
176 | return NULL; | |
177 | } | |
178 | ||
1f3736c9 | 179 | char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) |
5cb113fd MH |
180 | { |
181 | char *tmp = bf; | |
182 | int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, | |
183 | sbuild_id, sbuild_id + 2); | |
184 | if (ret < 0 || (tmp && size < (unsigned int)ret)) | |
185 | return NULL; | |
186 | return bf; | |
187 | } | |
188 | ||
8bde8516 | 189 | /* The caller is responsible to free the returned buffer. */ |
1f3736c9 MH |
190 | char *build_id_cache__origname(const char *sbuild_id) |
191 | { | |
192 | char *linkname; | |
193 | char buf[PATH_MAX]; | |
194 | char *ret = NULL, *p; | |
195 | size_t offs = 5; /* == strlen("../..") */ | |
5a234211 | 196 | ssize_t len; |
1f3736c9 MH |
197 | |
198 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
199 | if (!linkname) | |
200 | return NULL; | |
201 | ||
5a234211 TR |
202 | len = readlink(linkname, buf, sizeof(buf) - 1); |
203 | if (len <= 0) | |
1f3736c9 | 204 | goto out; |
5a234211 TR |
205 | buf[len] = '\0'; |
206 | ||
1f3736c9 MH |
207 | /* The link should be "../..<origpath>/<sbuild_id>" */ |
208 | p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ | |
209 | if (p && (p > buf + offs)) { | |
210 | *p = '\0'; | |
211 | if (buf[offs + 1] == '[') | |
212 | offs++; /* | |
213 | * This is a DSO name, like [kernel.kallsyms]. | |
214 | * Skip the first '/', since this is not the | |
215 | * cache of a regular file. | |
216 | */ | |
217 | ret = strdup(buf + offs); /* Skip "../..[/]" */ | |
218 | } | |
219 | out: | |
220 | free(linkname); | |
221 | return ret; | |
222 | } | |
223 | ||
c3492a3a MH |
224 | /* Check if the given build_id cache is valid on current running system */ |
225 | static bool build_id_cache__valid_id(char *sbuild_id) | |
226 | { | |
227 | char real_sbuild_id[SBUILD_ID_SIZE] = ""; | |
228 | char *pathname; | |
229 | int ret = 0; | |
230 | bool result = false; | |
231 | ||
232 | pathname = build_id_cache__origname(sbuild_id); | |
233 | if (!pathname) | |
234 | return false; | |
235 | ||
236 | if (!strcmp(pathname, DSO__NAME_KALLSYMS)) | |
237 | ret = sysfs__sprintf_build_id("/", real_sbuild_id); | |
238 | else if (pathname[0] == '/') | |
239 | ret = filename__sprintf_build_id(pathname, real_sbuild_id); | |
240 | else | |
241 | ret = -EINVAL; /* Should we support other special DSO cache? */ | |
242 | if (ret >= 0) | |
243 | result = (strcmp(sbuild_id, real_sbuild_id) == 0); | |
244 | free(pathname); | |
245 | ||
246 | return result; | |
247 | } | |
248 | ||
d2396999 KJ |
249 | static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, |
250 | bool is_debug) | |
01412261 | 251 | { |
d2396999 KJ |
252 | return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? |
253 | "debug" : "elf")); | |
01412261 MH |
254 | } |
255 | ||
d2396999 KJ |
256 | char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
257 | bool is_debug) | |
b36f19d5 | 258 | { |
01412261 MH |
259 | bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); |
260 | bool is_vdso = dso__is_vdso((struct dso *)dso); | |
261 | char sbuild_id[SBUILD_ID_SIZE]; | |
262 | char *linkname; | |
263 | bool alloc = (bf == NULL); | |
264 | int ret; | |
b36f19d5 | 265 | |
c824c433 | 266 | if (!dso->has_build_id) |
b36f19d5 ACM |
267 | return NULL; |
268 | ||
01412261 MH |
269 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
270 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
271 | if (!linkname) | |
272 | return NULL; | |
273 | ||
274 | /* Check if old style build_id cache */ | |
275 | if (is_regular_file(linkname)) | |
276 | ret = asnprintf(&bf, size, "%s", linkname); | |
277 | else | |
278 | ret = asnprintf(&bf, size, "%s/%s", linkname, | |
d2396999 KJ |
279 | build_id_cache__basename(is_kallsyms, is_vdso, |
280 | is_debug)); | |
01412261 MH |
281 | if (ret < 0 || (!alloc && size < (unsigned int)ret)) |
282 | bf = NULL; | |
283 | free(linkname); | |
284 | ||
285 | return bf; | |
b36f19d5 | 286 | } |
e195fac8 NK |
287 | |
288 | #define dsos__for_each_with_build_id(pos, head) \ | |
289 | list_for_each_entry(pos, head, node) \ | |
290 | if (!pos->has_build_id) \ | |
291 | continue; \ | |
292 | else | |
293 | ||
294 | static int write_buildid(const char *name, size_t name_len, u8 *build_id, | |
ccebbeb6 | 295 | pid_t pid, u16 misc, struct feat_fd *fd) |
e195fac8 NK |
296 | { |
297 | int err; | |
298 | struct build_id_event b; | |
299 | size_t len; | |
300 | ||
301 | len = name_len + 1; | |
302 | len = PERF_ALIGN(len, NAME_ALIGN); | |
303 | ||
304 | memset(&b, 0, sizeof(b)); | |
305 | memcpy(&b.build_id, build_id, BUILD_ID_SIZE); | |
306 | b.pid = pid; | |
307 | b.header.misc = misc; | |
308 | b.header.size = sizeof(b) + len; | |
309 | ||
3b8f51a6 | 310 | err = do_write(fd, &b, sizeof(b)); |
e195fac8 NK |
311 | if (err < 0) |
312 | return err; | |
313 | ||
314 | return write_padded(fd, name, name_len + 1, len); | |
315 | } | |
316 | ||
ccebbeb6 DCC |
317 | static int machine__write_buildid_table(struct machine *machine, |
318 | struct feat_fd *fd) | |
e195fac8 | 319 | { |
3d39ac53 | 320 | int err = 0; |
e195fac8 | 321 | struct dso *pos; |
3d39ac53 ACM |
322 | u16 kmisc = PERF_RECORD_MISC_KERNEL, |
323 | umisc = PERF_RECORD_MISC_USER; | |
324 | ||
325 | if (!machine__is_host(machine)) { | |
326 | kmisc = PERF_RECORD_MISC_GUEST_KERNEL; | |
327 | umisc = PERF_RECORD_MISC_GUEST_USER; | |
328 | } | |
e195fac8 | 329 | |
3d39ac53 | 330 | dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
e195fac8 NK |
331 | const char *name; |
332 | size_t name_len; | |
fd786fac | 333 | bool in_kernel = false; |
e195fac8 | 334 | |
6ae98ba6 | 335 | if (!pos->hit && !dso__is_vdso(pos)) |
e195fac8 NK |
336 | continue; |
337 | ||
338 | if (dso__is_vdso(pos)) { | |
339 | name = pos->short_name; | |
70a2cba9 | 340 | name_len = pos->short_name_len; |
e195fac8 | 341 | } else if (dso__is_kcore(pos)) { |
8c7f1bb3 JO |
342 | name = machine->mmap_name; |
343 | name_len = strlen(name); | |
e195fac8 NK |
344 | } else { |
345 | name = pos->long_name; | |
70a2cba9 | 346 | name_len = pos->long_name_len; |
e195fac8 NK |
347 | } |
348 | ||
fd786fac WN |
349 | in_kernel = pos->kernel || |
350 | is_kernel_module(name, | |
351 | PERF_RECORD_MISC_CPUMODE_UNKNOWN); | |
3d39ac53 | 352 | err = write_buildid(name, name_len, pos->build_id, machine->pid, |
fd786fac | 353 | in_kernel ? kmisc : umisc, fd); |
e195fac8 | 354 | if (err) |
3d39ac53 | 355 | break; |
e195fac8 NK |
356 | } |
357 | ||
e195fac8 NK |
358 | return err; |
359 | } | |
360 | ||
ccebbeb6 DCC |
361 | int perf_session__write_buildid_table(struct perf_session *session, |
362 | struct feat_fd *fd) | |
e195fac8 NK |
363 | { |
364 | struct rb_node *nd; | |
365 | int err = machine__write_buildid_table(&session->machines.host, fd); | |
366 | ||
367 | if (err) | |
368 | return err; | |
369 | ||
f3acb3a8 DB |
370 | for (nd = rb_first_cached(&session->machines.guests); nd; |
371 | nd = rb_next(nd)) { | |
e195fac8 NK |
372 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
373 | err = machine__write_buildid_table(pos, fd); | |
374 | if (err) | |
375 | break; | |
376 | } | |
377 | return err; | |
378 | } | |
379 | ||
380 | static int __dsos__hit_all(struct list_head *head) | |
381 | { | |
382 | struct dso *pos; | |
383 | ||
384 | list_for_each_entry(pos, head, node) | |
385 | pos->hit = true; | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int machine__hit_all_dsos(struct machine *machine) | |
391 | { | |
3d39ac53 | 392 | return __dsos__hit_all(&machine->dsos.head); |
e195fac8 NK |
393 | } |
394 | ||
395 | int dsos__hit_all(struct perf_session *session) | |
396 | { | |
397 | struct rb_node *nd; | |
398 | int err; | |
399 | ||
400 | err = machine__hit_all_dsos(&session->machines.host); | |
401 | if (err) | |
402 | return err; | |
403 | ||
f3acb3a8 DB |
404 | for (nd = rb_first_cached(&session->machines.guests); nd; |
405 | nd = rb_next(nd)) { | |
e195fac8 NK |
406 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
407 | ||
408 | err = machine__hit_all_dsos(pos); | |
409 | if (err) | |
410 | return err; | |
411 | } | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
73c5d224 NK |
416 | void disable_buildid_cache(void) |
417 | { | |
418 | no_buildid_cache = true; | |
419 | } | |
420 | ||
1f3736c9 | 421 | static bool lsdir_bid_head_filter(const char *name __maybe_unused, |
767fe71b | 422 | struct dirent *d) |
1f3736c9 MH |
423 | { |
424 | return (strlen(d->d_name) == 2) && | |
425 | isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); | |
426 | } | |
427 | ||
428 | static bool lsdir_bid_tail_filter(const char *name __maybe_unused, | |
767fe71b | 429 | struct dirent *d) |
1f3736c9 MH |
430 | { |
431 | int i = 0; | |
432 | while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) | |
433 | i++; | |
434 | return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); | |
435 | } | |
436 | ||
c3492a3a | 437 | struct strlist *build_id_cache__list_all(bool validonly) |
1f3736c9 MH |
438 | { |
439 | struct strlist *toplist, *linklist = NULL, *bidlist; | |
440 | struct str_node *nd, *nd2; | |
441 | char *topdir, *linkdir = NULL; | |
442 | char sbuild_id[SBUILD_ID_SIZE]; | |
443 | ||
c3492a3a MH |
444 | /* for filename__ functions */ |
445 | if (validonly) | |
446 | symbol__init(NULL); | |
447 | ||
1f3736c9 MH |
448 | /* Open the top-level directory */ |
449 | if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) | |
450 | return NULL; | |
451 | ||
452 | bidlist = strlist__new(NULL, NULL); | |
453 | if (!bidlist) | |
454 | goto out; | |
455 | ||
456 | toplist = lsdir(topdir, lsdir_bid_head_filter); | |
457 | if (!toplist) { | |
458 | pr_debug("Error in lsdir(%s): %d\n", topdir, errno); | |
459 | /* If there is no buildid cache, return an empty list */ | |
460 | if (errno == ENOENT) | |
461 | goto out; | |
462 | goto err_out; | |
463 | } | |
464 | ||
465 | strlist__for_each_entry(nd, toplist) { | |
466 | if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) | |
467 | goto err_out; | |
468 | /* Open the lower-level directory */ | |
469 | linklist = lsdir(linkdir, lsdir_bid_tail_filter); | |
470 | if (!linklist) { | |
471 | pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); | |
472 | goto err_out; | |
473 | } | |
474 | strlist__for_each_entry(nd2, linklist) { | |
475 | if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", | |
476 | nd->s, nd2->s) != SBUILD_ID_SIZE - 1) | |
477 | goto err_out; | |
c3492a3a MH |
478 | if (validonly && !build_id_cache__valid_id(sbuild_id)) |
479 | continue; | |
1f3736c9 MH |
480 | if (strlist__add(bidlist, sbuild_id) < 0) |
481 | goto err_out; | |
482 | } | |
483 | strlist__delete(linklist); | |
484 | zfree(&linkdir); | |
485 | } | |
486 | ||
487 | out_free: | |
488 | strlist__delete(toplist); | |
489 | out: | |
490 | free(topdir); | |
491 | ||
492 | return bidlist; | |
493 | ||
494 | err_out: | |
495 | strlist__delete(linklist); | |
496 | zfree(&linkdir); | |
497 | strlist__delete(bidlist); | |
498 | bidlist = NULL; | |
499 | goto out_free; | |
500 | } | |
501 | ||
a598180a MH |
502 | static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) |
503 | { | |
504 | size_t i; | |
505 | ||
506 | for (i = 0; i < len; i++) { | |
507 | if (!isxdigit(maybe_sbuild_id[i])) | |
508 | return false; | |
509 | } | |
510 | return true; | |
511 | } | |
512 | ||
513 | /* Return the valid complete build-id */ | |
514 | char *build_id_cache__complement(const char *incomplete_sbuild_id) | |
515 | { | |
516 | struct strlist *bidlist; | |
517 | struct str_node *nd, *cand = NULL; | |
518 | char *sbuild_id = NULL; | |
519 | size_t len = strlen(incomplete_sbuild_id); | |
520 | ||
521 | if (len >= SBUILD_ID_SIZE || | |
522 | !str_is_build_id(incomplete_sbuild_id, len)) | |
523 | return NULL; | |
524 | ||
525 | bidlist = build_id_cache__list_all(true); | |
526 | if (!bidlist) | |
527 | return NULL; | |
528 | ||
529 | strlist__for_each_entry(nd, bidlist) { | |
530 | if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) | |
531 | continue; | |
532 | if (cand) { /* Error: There are more than 2 candidates. */ | |
533 | cand = NULL; | |
534 | break; | |
535 | } | |
536 | cand = nd; | |
537 | } | |
538 | if (cand) | |
539 | sbuild_id = strdup(cand->s); | |
540 | strlist__delete(bidlist); | |
541 | ||
542 | return sbuild_id; | |
543 | } | |
544 | ||
4698b8b7 | 545 | char *build_id_cache__cachedir(const char *sbuild_id, const char *name, |
f045b8c4 KJ |
546 | struct nsinfo *nsi, bool is_kallsyms, |
547 | bool is_vdso) | |
8d8c8e4c MH |
548 | { |
549 | char *realname = (char *)name, *filename; | |
550 | bool slash = is_kallsyms || is_vdso; | |
551 | ||
552 | if (!slash) { | |
f045b8c4 | 553 | realname = nsinfo__realpath(name, nsi); |
8d8c8e4c MH |
554 | if (!realname) |
555 | return NULL; | |
556 | } | |
557 | ||
01412261 MH |
558 | if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", |
559 | is_vdso ? DSO__NAME_VDSO : realname, | |
560 | sbuild_id ? "/" : "", sbuild_id ?: "") < 0) | |
8d8c8e4c MH |
561 | filename = NULL; |
562 | ||
563 | if (!slash) | |
564 | free(realname); | |
565 | ||
566 | return filename; | |
567 | } | |
568 | ||
f045b8c4 | 569 | int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, |
8d8c8e4c MH |
570 | struct strlist **result) |
571 | { | |
8d8c8e4c | 572 | char *dir_name; |
8d8c8e4c MH |
573 | int ret = 0; |
574 | ||
f045b8c4 | 575 | dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); |
d65444d2 MH |
576 | if (!dir_name) |
577 | return -ENOMEM; | |
8d8c8e4c | 578 | |
d65444d2 MH |
579 | *result = lsdir(dir_name, lsdir_no_dot_filter); |
580 | if (!*result) | |
8d8c8e4c | 581 | ret = -errno; |
8d8c8e4c | 582 | free(dir_name); |
8d8c8e4c MH |
583 | |
584 | return ret; | |
585 | } | |
586 | ||
1c1a3a47 | 587 | #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) |
6430a94e | 588 | static int build_id_cache__add_sdt_cache(const char *sbuild_id, |
f045b8c4 KJ |
589 | const char *realname, |
590 | struct nsinfo *nsi) | |
6430a94e MH |
591 | { |
592 | struct probe_cache *cache; | |
593 | int ret; | |
f045b8c4 | 594 | struct nscookie nsc; |
6430a94e | 595 | |
f045b8c4 | 596 | cache = probe_cache__new(sbuild_id, nsi); |
6430a94e MH |
597 | if (!cache) |
598 | return -1; | |
599 | ||
f045b8c4 | 600 | nsinfo__mountns_enter(nsi, &nsc); |
6430a94e | 601 | ret = probe_cache__scan_sdt(cache, realname); |
f045b8c4 | 602 | nsinfo__mountns_exit(&nsc); |
6430a94e | 603 | if (ret >= 0) { |
f9655200 | 604 | pr_debug4("Found %d SDTs in %s\n", ret, realname); |
6430a94e MH |
605 | if (probe_cache__commit(cache) < 0) |
606 | ret = -1; | |
607 | } | |
608 | probe_cache__delete(cache); | |
609 | return ret; | |
610 | } | |
611 | #else | |
f045b8c4 | 612 | #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) |
6430a94e MH |
613 | #endif |
614 | ||
d2396999 KJ |
615 | static char *build_id_cache__find_debug(const char *sbuild_id, |
616 | struct nsinfo *nsi) | |
617 | { | |
618 | char *realname = NULL; | |
619 | char *debugfile; | |
620 | struct nscookie nsc; | |
621 | size_t len = 0; | |
622 | ||
623 | debugfile = calloc(1, PATH_MAX); | |
624 | if (!debugfile) | |
625 | goto out; | |
626 | ||
627 | len = __symbol__join_symfs(debugfile, PATH_MAX, | |
628 | "/usr/lib/debug/.build-id/"); | |
629 | snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, | |
630 | sbuild_id + 2); | |
631 | ||
632 | nsinfo__mountns_enter(nsi, &nsc); | |
633 | realname = realpath(debugfile, NULL); | |
634 | if (realname && access(realname, R_OK)) | |
635 | zfree(&realname); | |
636 | nsinfo__mountns_exit(&nsc); | |
637 | out: | |
638 | free(debugfile); | |
639 | return realname; | |
640 | } | |
641 | ||
e35f7362 | 642 | int build_id_cache__add_s(const char *sbuild_id, const char *name, |
f045b8c4 | 643 | struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) |
e195fac8 NK |
644 | { |
645 | const size_t size = PATH_MAX; | |
8d8c8e4c | 646 | char *realname = NULL, *filename = NULL, *dir_name = NULL, |
01412261 | 647 | *linkname = zalloc(size), *tmp; |
d2396999 | 648 | char *debugfile = NULL; |
8d8c8e4c | 649 | int err = -1; |
e195fac8 | 650 | |
8d8c8e4c | 651 | if (!is_kallsyms) { |
f045b8c4 KJ |
652 | if (!is_vdso) |
653 | realname = nsinfo__realpath(name, nsi); | |
654 | else | |
655 | realname = realpath(name, NULL); | |
8d8c8e4c MH |
656 | if (!realname) |
657 | goto out_free; | |
658 | } | |
e195fac8 | 659 | |
f045b8c4 KJ |
660 | dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, |
661 | is_vdso); | |
8d8c8e4c | 662 | if (!dir_name) |
e195fac8 NK |
663 | goto out_free; |
664 | ||
01412261 MH |
665 | /* Remove old style build-id cache */ |
666 | if (is_regular_file(dir_name)) | |
667 | if (unlink(dir_name)) | |
668 | goto out_free; | |
669 | ||
8d8c8e4c | 670 | if (mkdir_p(dir_name, 0755)) |
e195fac8 NK |
671 | goto out_free; |
672 | ||
01412261 MH |
673 | /* Save the allocated buildid dirname */ |
674 | if (asprintf(&filename, "%s/%s", dir_name, | |
d2396999 KJ |
675 | build_id_cache__basename(is_kallsyms, is_vdso, |
676 | false)) < 0) { | |
8d8c8e4c MH |
677 | filename = NULL; |
678 | goto out_free; | |
679 | } | |
e195fac8 NK |
680 | |
681 | if (access(filename, F_OK)) { | |
682 | if (is_kallsyms) { | |
f045b8c4 KJ |
683 | if (copyfile("/proc/kallsyms", filename)) |
684 | goto out_free; | |
685 | } else if (nsi && nsi->need_setns) { | |
686 | if (copyfile_ns(name, filename, nsi)) | |
e195fac8 | 687 | goto out_free; |
0635b0f7 MV |
688 | } else if (link(realname, filename) && errno != EEXIST && |
689 | copyfile(name, filename)) | |
e195fac8 NK |
690 | goto out_free; |
691 | } | |
692 | ||
d2396999 KJ |
693 | /* Some binaries are stripped, but have .debug files with their symbol |
694 | * table. Check to see if we can locate one of those, since the elf | |
695 | * file itself may not be very useful to users of our tools without a | |
696 | * symtab. | |
697 | */ | |
698 | if (!is_kallsyms && !is_vdso && | |
699 | strncmp(".ko", name + strlen(name) - 3, 3)) { | |
700 | debugfile = build_id_cache__find_debug(sbuild_id, nsi); | |
701 | if (debugfile) { | |
702 | zfree(&filename); | |
703 | if (asprintf(&filename, "%s/%s", dir_name, | |
704 | build_id_cache__basename(false, false, true)) < 0) { | |
705 | filename = NULL; | |
706 | goto out_free; | |
707 | } | |
708 | if (access(filename, F_OK)) { | |
709 | if (nsi && nsi->need_setns) { | |
710 | if (copyfile_ns(debugfile, filename, | |
711 | nsi)) | |
712 | goto out_free; | |
713 | } else if (link(debugfile, filename) && | |
714 | errno != EEXIST && | |
715 | copyfile(debugfile, filename)) | |
716 | goto out_free; | |
717 | } | |
718 | } | |
719 | } | |
720 | ||
01412261 | 721 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd MH |
722 | goto out_free; |
723 | tmp = strrchr(linkname, '/'); | |
724 | *tmp = '\0'; | |
e195fac8 NK |
725 | |
726 | if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) | |
727 | goto out_free; | |
728 | ||
5cb113fd | 729 | *tmp = '/'; |
01412261 MH |
730 | tmp = dir_name + strlen(buildid_dir) - 5; |
731 | memcpy(tmp, "../..", 5); | |
e195fac8 | 732 | |
01412261 | 733 | if (symlink(tmp, linkname) == 0) |
e195fac8 | 734 | err = 0; |
6430a94e MH |
735 | |
736 | /* Update SDT cache : error is just warned */ | |
f045b8c4 KJ |
737 | if (realname && |
738 | build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) | |
f9655200 | 739 | pr_debug4("Failed to update/scan SDT cache for %s\n", realname); |
6430a94e | 740 | |
e195fac8 NK |
741 | out_free: |
742 | if (!is_kallsyms) | |
743 | free(realname); | |
744 | free(filename); | |
d2396999 | 745 | free(debugfile); |
8d8c8e4c | 746 | free(dir_name); |
e195fac8 NK |
747 | free(linkname); |
748 | return err; | |
749 | } | |
750 | ||
751 | static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size, | |
f045b8c4 KJ |
752 | const char *name, struct nsinfo *nsi, |
753 | bool is_kallsyms, bool is_vdso) | |
e195fac8 | 754 | { |
d77fac7f | 755 | char sbuild_id[SBUILD_ID_SIZE]; |
e195fac8 NK |
756 | |
757 | build_id__sprintf(build_id, build_id_size, sbuild_id); | |
758 | ||
f045b8c4 KJ |
759 | return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, |
760 | is_vdso); | |
e195fac8 NK |
761 | } |
762 | ||
a50d11a1 MH |
763 | bool build_id_cache__cached(const char *sbuild_id) |
764 | { | |
765 | bool ret = false; | |
01412261 | 766 | char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); |
a50d11a1 MH |
767 | |
768 | if (filename && !access(filename, F_OK)) | |
769 | ret = true; | |
770 | free(filename); | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
e35f7362 | 775 | int build_id_cache__remove_s(const char *sbuild_id) |
e195fac8 NK |
776 | { |
777 | const size_t size = PATH_MAX; | |
778 | char *filename = zalloc(size), | |
5cb113fd | 779 | *linkname = zalloc(size), *tmp; |
e195fac8 NK |
780 | int err = -1; |
781 | ||
782 | if (filename == NULL || linkname == NULL) | |
783 | goto out_free; | |
784 | ||
01412261 | 785 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd | 786 | goto out_free; |
e195fac8 NK |
787 | |
788 | if (access(linkname, F_OK)) | |
789 | goto out_free; | |
790 | ||
791 | if (readlink(linkname, filename, size - 1) < 0) | |
792 | goto out_free; | |
793 | ||
794 | if (unlink(linkname)) | |
795 | goto out_free; | |
796 | ||
797 | /* | |
798 | * Since the link is relative, we must make it absolute: | |
799 | */ | |
5cb113fd MH |
800 | tmp = strrchr(linkname, '/') + 1; |
801 | snprintf(tmp, size - (tmp - linkname), "%s", filename); | |
e195fac8 | 802 | |
01412261 | 803 | if (rm_rf(linkname)) |
e195fac8 NK |
804 | goto out_free; |
805 | ||
806 | err = 0; | |
807 | out_free: | |
808 | free(filename); | |
809 | free(linkname); | |
810 | return err; | |
811 | } | |
812 | ||
e35f7362 | 813 | static int dso__cache_build_id(struct dso *dso, struct machine *machine) |
e195fac8 | 814 | { |
01412261 | 815 | bool is_kallsyms = dso__is_kallsyms(dso); |
e195fac8 NK |
816 | bool is_vdso = dso__is_vdso(dso); |
817 | const char *name = dso->long_name; | |
e195fac8 NK |
818 | |
819 | if (dso__is_kcore(dso)) { | |
820 | is_kallsyms = true; | |
8c7f1bb3 | 821 | name = machine->mmap_name; |
e195fac8 NK |
822 | } |
823 | return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name, | |
f045b8c4 | 824 | dso->nsinfo, is_kallsyms, is_vdso); |
e195fac8 NK |
825 | } |
826 | ||
827 | static int __dsos__cache_build_ids(struct list_head *head, | |
e35f7362 | 828 | struct machine *machine) |
e195fac8 NK |
829 | { |
830 | struct dso *pos; | |
831 | int err = 0; | |
832 | ||
833 | dsos__for_each_with_build_id(pos, head) | |
e35f7362 | 834 | if (dso__cache_build_id(pos, machine)) |
e195fac8 NK |
835 | err = -1; |
836 | ||
837 | return err; | |
838 | } | |
839 | ||
e35f7362 | 840 | static int machine__cache_build_ids(struct machine *machine) |
e195fac8 | 841 | { |
3d39ac53 | 842 | return __dsos__cache_build_ids(&machine->dsos.head, machine); |
e195fac8 NK |
843 | } |
844 | ||
845 | int perf_session__cache_build_ids(struct perf_session *session) | |
846 | { | |
847 | struct rb_node *nd; | |
848 | int ret; | |
e195fac8 | 849 | |
73c5d224 NK |
850 | if (no_buildid_cache) |
851 | return 0; | |
852 | ||
498922ad | 853 | if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
e195fac8 NK |
854 | return -1; |
855 | ||
e35f7362 | 856 | ret = machine__cache_build_ids(&session->machines.host); |
e195fac8 | 857 | |
f3acb3a8 DB |
858 | for (nd = rb_first_cached(&session->machines.guests); nd; |
859 | nd = rb_next(nd)) { | |
e195fac8 | 860 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
e35f7362 | 861 | ret |= machine__cache_build_ids(pos); |
e195fac8 NK |
862 | } |
863 | return ret ? -1 : 0; | |
864 | } | |
865 | ||
866 | static bool machine__read_build_ids(struct machine *machine, bool with_hits) | |
867 | { | |
3d39ac53 | 868 | return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
e195fac8 NK |
869 | } |
870 | ||
871 | bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) | |
872 | { | |
873 | struct rb_node *nd; | |
874 | bool ret = machine__read_build_ids(&session->machines.host, with_hits); | |
875 | ||
f3acb3a8 DB |
876 | for (nd = rb_first_cached(&session->machines.guests); nd; |
877 | nd = rb_next(nd)) { | |
e195fac8 NK |
878 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
879 | ret |= machine__read_build_ids(pos, with_hits); | |
880 | } | |
881 | ||
882 | return ret; | |
883 | } |