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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 | */ | |
32ff3fec | 10 | #include "util.h" // lsdir(), mkdir_p(), rm_rf() |
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> | |
32ff3fec | 16 | #include "util/copyfile.h" |
fac583fd | 17 | #include "dso.h" |
7b2567c1 ACM |
18 | #include "build-id.h" |
19 | #include "event.h" | |
40f3b2d2 | 20 | #include "namespaces.h" |
1101f69a | 21 | #include "map.h" |
7b2567c1 | 22 | #include "symbol.h" |
e7ff8920 | 23 | #include "thread.h" |
7b2567c1 | 24 | #include <linux/kernel.h> |
591765fd | 25 | #include "debug.h" |
d20deb64 | 26 | #include "session.h" |
45694aa7 | 27 | #include "tool.h" |
e195fac8 NK |
28 | #include "header.h" |
29 | #include "vdso.h" | |
9a3993d4 | 30 | #include "path.h" |
6430a94e | 31 | #include "probe-file.h" |
8ec20b17 | 32 | #include "strlist.h" |
7b2567c1 | 33 | |
c7a14fdc FCE |
34 | #ifdef HAVE_DEBUGINFOD_SUPPORT |
35 | #include <elfutils/debuginfod.h> | |
36 | #endif | |
37 | ||
3052ba56 | 38 | #include <linux/ctype.h> |
7f7c536f | 39 | #include <linux/zalloc.h> |
f45edd86 | 40 | #include <linux/string.h> |
bf541169 | 41 | #include <asm/bug.h> |
73c5d224 NK |
42 | |
43 | static bool no_buildid_cache; | |
44 | ||
54a3cf59 AV |
45 | int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
46 | union perf_event *event, | |
ef89325f | 47 | struct perf_sample *sample, |
32dcd021 | 48 | struct evsel *evsel __maybe_unused, |
54a3cf59 | 49 | struct machine *machine) |
7b2567c1 ACM |
50 | { |
51 | struct addr_location al; | |
ef89325f | 52 | struct thread *thread = machine__findnew_thread(machine, sample->pid, |
13ce34df | 53 | sample->tid); |
7b2567c1 ACM |
54 | |
55 | if (thread == NULL) { | |
56 | pr_err("problem processing %d event, skipping it.\n", | |
57 | event->header.type); | |
58 | return -1; | |
59 | } | |
60 | ||
71a84b5a | 61 | if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) |
7b2567c1 ACM |
62 | al.map->dso->hit = 1; |
63 | ||
b91fc39f | 64 | thread__put(thread); |
7b2567c1 ACM |
65 | return 0; |
66 | } | |
67 | ||
1d037ca1 | 68 | static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, |
d20deb64 | 69 | union perf_event *event, |
1d037ca1 IT |
70 | struct perf_sample *sample |
71 | __maybe_unused, | |
743eb868 | 72 | struct machine *machine) |
591765fd | 73 | { |
314add6b AH |
74 | struct thread *thread = machine__findnew_thread(machine, |
75 | event->fork.pid, | |
76 | event->fork.tid); | |
591765fd | 77 | |
8115d60c ACM |
78 | dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, |
79 | event->fork.ppid, event->fork.ptid); | |
591765fd | 80 | |
b91fc39f | 81 | if (thread) { |
5e78c69b | 82 | machine__remove_thread(machine, thread); |
b91fc39f ACM |
83 | thread__put(thread); |
84 | } | |
591765fd ACM |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
45694aa7 | 89 | struct perf_tool build_id__mark_dso_hit_ops = { |
7b2567c1 | 90 | .sample = build_id__mark_dso_hit, |
8115d60c | 91 | .mmap = perf_event__process_mmap, |
5c5e854b | 92 | .mmap2 = perf_event__process_mmap2, |
f62d3f0f | 93 | .fork = perf_event__process_fork, |
8115d60c | 94 | .exit = perf_event__exit_del_thread, |
299c3452 SE |
95 | .attr = perf_event__process_attr, |
96 | .build_id = perf_event__process_build_id, | |
1216b65c | 97 | .ordered_events = true, |
7b2567c1 | 98 | }; |
b36f19d5 | 99 | |
bf541169 | 100 | int build_id__sprintf(const struct build_id *build_id, char *bf) |
ebb296c2 JO |
101 | { |
102 | char *bid = bf; | |
bf541169 JO |
103 | const u8 *raw = build_id->data; |
104 | size_t i; | |
ebb296c2 | 105 | |
6311951d JO |
106 | bf[0] = 0x0; |
107 | ||
bf541169 | 108 | for (i = 0; i < build_id->size; ++i) { |
ebb296c2 JO |
109 | sprintf(bid, "%02x", *raw); |
110 | ++raw; | |
111 | bid += 2; | |
112 | } | |
113 | ||
7375e151 | 114 | return (bid - bf) + 1; |
ebb296c2 JO |
115 | } |
116 | ||
0b5a7935 MH |
117 | int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) |
118 | { | |
119 | char notes[PATH_MAX]; | |
3ff1b8c8 | 120 | struct build_id bid; |
0b5a7935 MH |
121 | int ret; |
122 | ||
123 | if (!root_dir) | |
124 | root_dir = ""; | |
125 | ||
126 | scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); | |
127 | ||
3ff1b8c8 | 128 | ret = sysfs__read_build_id(notes, &bid); |
0b5a7935 MH |
129 | if (ret < 0) |
130 | return ret; | |
131 | ||
bf541169 | 132 | return build_id__sprintf(&bid, sbuild_id); |
0b5a7935 MH |
133 | } |
134 | ||
135 | int filename__sprintf_build_id(const char *pathname, char *sbuild_id) | |
136 | { | |
f766819c | 137 | struct build_id bid; |
0b5a7935 MH |
138 | int ret; |
139 | ||
f766819c | 140 | ret = filename__read_build_id(pathname, &bid); |
0b5a7935 MH |
141 | if (ret < 0) |
142 | return ret; | |
0b5a7935 | 143 | |
bf541169 | 144 | return build_id__sprintf(&bid, sbuild_id); |
0b5a7935 MH |
145 | } |
146 | ||
5cb113fd MH |
147 | /* asnprintf consolidates asprintf and snprintf */ |
148 | static int asnprintf(char **strp, size_t size, const char *fmt, ...) | |
149 | { | |
150 | va_list ap; | |
151 | int ret; | |
152 | ||
153 | if (!strp) | |
154 | return -EINVAL; | |
155 | ||
156 | va_start(ap, fmt); | |
157 | if (*strp) | |
158 | ret = vsnprintf(*strp, size, fmt, ap); | |
159 | else | |
160 | ret = vasprintf(strp, fmt, ap); | |
161 | va_end(ap); | |
162 | ||
163 | return ret; | |
164 | } | |
165 | ||
01412261 MH |
166 | char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, |
167 | size_t size) | |
168 | { | |
01412261 MH |
169 | bool retry_old = true; |
170 | ||
c58c49ac WN |
171 | snprintf(bf, size, "%s/%s/%s/kallsyms", |
172 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
173 | retry: |
174 | if (!access(bf, F_OK)) | |
175 | return bf; | |
01412261 MH |
176 | if (retry_old) { |
177 | /* Try old style kallsyms cache */ | |
c58c49ac WN |
178 | snprintf(bf, size, "%s/%s/%s", |
179 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
180 | retry_old = false; |
181 | goto retry; | |
182 | } | |
183 | ||
184 | return NULL; | |
185 | } | |
186 | ||
1f3736c9 | 187 | char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) |
5cb113fd MH |
188 | { |
189 | char *tmp = bf; | |
190 | int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, | |
191 | sbuild_id, sbuild_id + 2); | |
192 | if (ret < 0 || (tmp && size < (unsigned int)ret)) | |
193 | return NULL; | |
194 | return bf; | |
195 | } | |
196 | ||
8bde8516 | 197 | /* The caller is responsible to free the returned buffer. */ |
1f3736c9 MH |
198 | char *build_id_cache__origname(const char *sbuild_id) |
199 | { | |
200 | char *linkname; | |
201 | char buf[PATH_MAX]; | |
202 | char *ret = NULL, *p; | |
203 | size_t offs = 5; /* == strlen("../..") */ | |
5a234211 | 204 | ssize_t len; |
1f3736c9 MH |
205 | |
206 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
207 | if (!linkname) | |
208 | return NULL; | |
209 | ||
5a234211 TR |
210 | len = readlink(linkname, buf, sizeof(buf) - 1); |
211 | if (len <= 0) | |
1f3736c9 | 212 | goto out; |
5a234211 TR |
213 | buf[len] = '\0'; |
214 | ||
1f3736c9 MH |
215 | /* The link should be "../..<origpath>/<sbuild_id>" */ |
216 | p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ | |
217 | if (p && (p > buf + offs)) { | |
218 | *p = '\0'; | |
219 | if (buf[offs + 1] == '[') | |
220 | offs++; /* | |
221 | * This is a DSO name, like [kernel.kallsyms]. | |
222 | * Skip the first '/', since this is not the | |
223 | * cache of a regular file. | |
224 | */ | |
225 | ret = strdup(buf + offs); /* Skip "../..[/]" */ | |
226 | } | |
227 | out: | |
228 | free(linkname); | |
229 | return ret; | |
230 | } | |
231 | ||
c3492a3a MH |
232 | /* Check if the given build_id cache is valid on current running system */ |
233 | static bool build_id_cache__valid_id(char *sbuild_id) | |
234 | { | |
235 | char real_sbuild_id[SBUILD_ID_SIZE] = ""; | |
236 | char *pathname; | |
237 | int ret = 0; | |
238 | bool result = false; | |
239 | ||
240 | pathname = build_id_cache__origname(sbuild_id); | |
241 | if (!pathname) | |
242 | return false; | |
243 | ||
244 | if (!strcmp(pathname, DSO__NAME_KALLSYMS)) | |
245 | ret = sysfs__sprintf_build_id("/", real_sbuild_id); | |
246 | else if (pathname[0] == '/') | |
247 | ret = filename__sprintf_build_id(pathname, real_sbuild_id); | |
248 | else | |
249 | ret = -EINVAL; /* Should we support other special DSO cache? */ | |
250 | if (ret >= 0) | |
251 | result = (strcmp(sbuild_id, real_sbuild_id) == 0); | |
252 | free(pathname); | |
253 | ||
254 | return result; | |
255 | } | |
256 | ||
d2396999 KJ |
257 | static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, |
258 | bool is_debug) | |
01412261 | 259 | { |
d2396999 KJ |
260 | return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? |
261 | "debug" : "elf")); | |
01412261 MH |
262 | } |
263 | ||
ca8ea73a JO |
264 | char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
265 | bool is_debug, bool is_kallsyms) | |
b36f19d5 | 266 | { |
01412261 MH |
267 | bool is_vdso = dso__is_vdso((struct dso *)dso); |
268 | char sbuild_id[SBUILD_ID_SIZE]; | |
269 | char *linkname; | |
270 | bool alloc = (bf == NULL); | |
271 | int ret; | |
b36f19d5 | 272 | |
c824c433 | 273 | if (!dso->has_build_id) |
b36f19d5 ACM |
274 | return NULL; |
275 | ||
bf541169 | 276 | build_id__sprintf(&dso->bid, sbuild_id); |
01412261 MH |
277 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); |
278 | if (!linkname) | |
279 | return NULL; | |
280 | ||
281 | /* Check if old style build_id cache */ | |
282 | if (is_regular_file(linkname)) | |
283 | ret = asnprintf(&bf, size, "%s", linkname); | |
284 | else | |
285 | ret = asnprintf(&bf, size, "%s/%s", linkname, | |
d2396999 KJ |
286 | build_id_cache__basename(is_kallsyms, is_vdso, |
287 | is_debug)); | |
01412261 MH |
288 | if (ret < 0 || (!alloc && size < (unsigned int)ret)) |
289 | bf = NULL; | |
290 | free(linkname); | |
291 | ||
292 | return bf; | |
b36f19d5 | 293 | } |
e195fac8 | 294 | |
ca8ea73a JO |
295 | char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
296 | bool is_debug) | |
297 | { | |
298 | bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); | |
299 | ||
300 | return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms); | |
301 | } | |
302 | ||
e195fac8 NK |
303 | #define dsos__for_each_with_build_id(pos, head) \ |
304 | list_for_each_entry(pos, head, node) \ | |
305 | if (!pos->has_build_id) \ | |
306 | continue; \ | |
307 | else | |
308 | ||
b0a323c7 | 309 | static int write_buildid(const char *name, size_t name_len, struct build_id *bid, |
ccebbeb6 | 310 | pid_t pid, u16 misc, struct feat_fd *fd) |
e195fac8 NK |
311 | { |
312 | int err; | |
72932371 | 313 | struct perf_record_header_build_id b; |
e195fac8 NK |
314 | size_t len; |
315 | ||
316 | len = name_len + 1; | |
317 | len = PERF_ALIGN(len, NAME_ALIGN); | |
318 | ||
319 | memset(&b, 0, sizeof(b)); | |
b0a323c7 JO |
320 | memcpy(&b.data, bid->data, bid->size); |
321 | b.size = (u8) bid->size; | |
322 | misc |= PERF_RECORD_MISC_BUILD_ID_SIZE; | |
e195fac8 NK |
323 | b.pid = pid; |
324 | b.header.misc = misc; | |
325 | b.header.size = sizeof(b) + len; | |
326 | ||
3b8f51a6 | 327 | err = do_write(fd, &b, sizeof(b)); |
e195fac8 NK |
328 | if (err < 0) |
329 | return err; | |
330 | ||
331 | return write_padded(fd, name, name_len + 1, len); | |
332 | } | |
333 | ||
ccebbeb6 DCC |
334 | static int machine__write_buildid_table(struct machine *machine, |
335 | struct feat_fd *fd) | |
e195fac8 | 336 | { |
3d39ac53 | 337 | int err = 0; |
e195fac8 | 338 | struct dso *pos; |
3d39ac53 ACM |
339 | u16 kmisc = PERF_RECORD_MISC_KERNEL, |
340 | umisc = PERF_RECORD_MISC_USER; | |
341 | ||
342 | if (!machine__is_host(machine)) { | |
343 | kmisc = PERF_RECORD_MISC_GUEST_KERNEL; | |
344 | umisc = PERF_RECORD_MISC_GUEST_USER; | |
345 | } | |
e195fac8 | 346 | |
3d39ac53 | 347 | dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
e195fac8 NK |
348 | const char *name; |
349 | size_t name_len; | |
fd786fac | 350 | bool in_kernel = false; |
e195fac8 | 351 | |
6ae98ba6 | 352 | if (!pos->hit && !dso__is_vdso(pos)) |
e195fac8 NK |
353 | continue; |
354 | ||
355 | if (dso__is_vdso(pos)) { | |
356 | name = pos->short_name; | |
70a2cba9 | 357 | name_len = pos->short_name_len; |
e195fac8 | 358 | } else if (dso__is_kcore(pos)) { |
8c7f1bb3 JO |
359 | name = machine->mmap_name; |
360 | name_len = strlen(name); | |
e195fac8 NK |
361 | } else { |
362 | name = pos->long_name; | |
70a2cba9 | 363 | name_len = pos->long_name_len; |
e195fac8 NK |
364 | } |
365 | ||
fd786fac WN |
366 | in_kernel = pos->kernel || |
367 | is_kernel_module(name, | |
368 | PERF_RECORD_MISC_CPUMODE_UNKNOWN); | |
b0a323c7 | 369 | err = write_buildid(name, name_len, &pos->bid, machine->pid, |
fd786fac | 370 | in_kernel ? kmisc : umisc, fd); |
e195fac8 | 371 | if (err) |
3d39ac53 | 372 | break; |
e195fac8 NK |
373 | } |
374 | ||
e195fac8 NK |
375 | return err; |
376 | } | |
377 | ||
ccebbeb6 DCC |
378 | int perf_session__write_buildid_table(struct perf_session *session, |
379 | struct feat_fd *fd) | |
e195fac8 NK |
380 | { |
381 | struct rb_node *nd; | |
382 | int err = machine__write_buildid_table(&session->machines.host, fd); | |
383 | ||
384 | if (err) | |
385 | return err; | |
386 | ||
f3acb3a8 DB |
387 | for (nd = rb_first_cached(&session->machines.guests); nd; |
388 | nd = rb_next(nd)) { | |
e195fac8 NK |
389 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
390 | err = machine__write_buildid_table(pos, fd); | |
391 | if (err) | |
392 | break; | |
393 | } | |
394 | return err; | |
395 | } | |
396 | ||
397 | static int __dsos__hit_all(struct list_head *head) | |
398 | { | |
399 | struct dso *pos; | |
400 | ||
401 | list_for_each_entry(pos, head, node) | |
402 | pos->hit = true; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | static int machine__hit_all_dsos(struct machine *machine) | |
408 | { | |
3d39ac53 | 409 | return __dsos__hit_all(&machine->dsos.head); |
e195fac8 NK |
410 | } |
411 | ||
412 | int dsos__hit_all(struct perf_session *session) | |
413 | { | |
414 | struct rb_node *nd; | |
415 | int err; | |
416 | ||
417 | err = machine__hit_all_dsos(&session->machines.host); | |
418 | if (err) | |
419 | return err; | |
420 | ||
f3acb3a8 DB |
421 | for (nd = rb_first_cached(&session->machines.guests); nd; |
422 | nd = rb_next(nd)) { | |
e195fac8 NK |
423 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
424 | ||
425 | err = machine__hit_all_dsos(pos); | |
426 | if (err) | |
427 | return err; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
73c5d224 NK |
433 | void disable_buildid_cache(void) |
434 | { | |
435 | no_buildid_cache = true; | |
436 | } | |
437 | ||
1f3736c9 | 438 | static bool lsdir_bid_head_filter(const char *name __maybe_unused, |
767fe71b | 439 | struct dirent *d) |
1f3736c9 MH |
440 | { |
441 | return (strlen(d->d_name) == 2) && | |
442 | isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); | |
443 | } | |
444 | ||
445 | static bool lsdir_bid_tail_filter(const char *name __maybe_unused, | |
767fe71b | 446 | struct dirent *d) |
1f3736c9 MH |
447 | { |
448 | int i = 0; | |
449 | while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) | |
450 | i++; | |
451 | return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); | |
452 | } | |
453 | ||
c3492a3a | 454 | struct strlist *build_id_cache__list_all(bool validonly) |
1f3736c9 MH |
455 | { |
456 | struct strlist *toplist, *linklist = NULL, *bidlist; | |
457 | struct str_node *nd, *nd2; | |
458 | char *topdir, *linkdir = NULL; | |
459 | char sbuild_id[SBUILD_ID_SIZE]; | |
460 | ||
c3492a3a MH |
461 | /* for filename__ functions */ |
462 | if (validonly) | |
463 | symbol__init(NULL); | |
464 | ||
1f3736c9 MH |
465 | /* Open the top-level directory */ |
466 | if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) | |
467 | return NULL; | |
468 | ||
469 | bidlist = strlist__new(NULL, NULL); | |
470 | if (!bidlist) | |
471 | goto out; | |
472 | ||
473 | toplist = lsdir(topdir, lsdir_bid_head_filter); | |
474 | if (!toplist) { | |
475 | pr_debug("Error in lsdir(%s): %d\n", topdir, errno); | |
476 | /* If there is no buildid cache, return an empty list */ | |
477 | if (errno == ENOENT) | |
478 | goto out; | |
479 | goto err_out; | |
480 | } | |
481 | ||
482 | strlist__for_each_entry(nd, toplist) { | |
483 | if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) | |
484 | goto err_out; | |
485 | /* Open the lower-level directory */ | |
486 | linklist = lsdir(linkdir, lsdir_bid_tail_filter); | |
487 | if (!linklist) { | |
488 | pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); | |
489 | goto err_out; | |
490 | } | |
491 | strlist__for_each_entry(nd2, linklist) { | |
492 | if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", | |
493 | nd->s, nd2->s) != SBUILD_ID_SIZE - 1) | |
494 | goto err_out; | |
c3492a3a MH |
495 | if (validonly && !build_id_cache__valid_id(sbuild_id)) |
496 | continue; | |
1f3736c9 MH |
497 | if (strlist__add(bidlist, sbuild_id) < 0) |
498 | goto err_out; | |
499 | } | |
500 | strlist__delete(linklist); | |
501 | zfree(&linkdir); | |
502 | } | |
503 | ||
504 | out_free: | |
505 | strlist__delete(toplist); | |
506 | out: | |
507 | free(topdir); | |
508 | ||
509 | return bidlist; | |
510 | ||
511 | err_out: | |
512 | strlist__delete(linklist); | |
513 | zfree(&linkdir); | |
514 | strlist__delete(bidlist); | |
515 | bidlist = NULL; | |
516 | goto out_free; | |
517 | } | |
518 | ||
a598180a MH |
519 | static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) |
520 | { | |
521 | size_t i; | |
522 | ||
523 | for (i = 0; i < len; i++) { | |
524 | if (!isxdigit(maybe_sbuild_id[i])) | |
525 | return false; | |
526 | } | |
527 | return true; | |
528 | } | |
529 | ||
530 | /* Return the valid complete build-id */ | |
531 | char *build_id_cache__complement(const char *incomplete_sbuild_id) | |
532 | { | |
533 | struct strlist *bidlist; | |
534 | struct str_node *nd, *cand = NULL; | |
535 | char *sbuild_id = NULL; | |
536 | size_t len = strlen(incomplete_sbuild_id); | |
537 | ||
538 | if (len >= SBUILD_ID_SIZE || | |
539 | !str_is_build_id(incomplete_sbuild_id, len)) | |
540 | return NULL; | |
541 | ||
542 | bidlist = build_id_cache__list_all(true); | |
543 | if (!bidlist) | |
544 | return NULL; | |
545 | ||
546 | strlist__for_each_entry(nd, bidlist) { | |
547 | if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) | |
548 | continue; | |
549 | if (cand) { /* Error: There are more than 2 candidates. */ | |
550 | cand = NULL; | |
551 | break; | |
552 | } | |
553 | cand = nd; | |
554 | } | |
555 | if (cand) | |
556 | sbuild_id = strdup(cand->s); | |
557 | strlist__delete(bidlist); | |
558 | ||
559 | return sbuild_id; | |
560 | } | |
561 | ||
4698b8b7 | 562 | char *build_id_cache__cachedir(const char *sbuild_id, const char *name, |
f045b8c4 KJ |
563 | struct nsinfo *nsi, bool is_kallsyms, |
564 | bool is_vdso) | |
8d8c8e4c MH |
565 | { |
566 | char *realname = (char *)name, *filename; | |
567 | bool slash = is_kallsyms || is_vdso; | |
568 | ||
569 | if (!slash) { | |
f045b8c4 | 570 | realname = nsinfo__realpath(name, nsi); |
8d8c8e4c MH |
571 | if (!realname) |
572 | return NULL; | |
573 | } | |
574 | ||
01412261 MH |
575 | if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", |
576 | is_vdso ? DSO__NAME_VDSO : realname, | |
577 | sbuild_id ? "/" : "", sbuild_id ?: "") < 0) | |
8d8c8e4c MH |
578 | filename = NULL; |
579 | ||
580 | if (!slash) | |
581 | free(realname); | |
582 | ||
583 | return filename; | |
584 | } | |
585 | ||
f045b8c4 | 586 | int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, |
8d8c8e4c MH |
587 | struct strlist **result) |
588 | { | |
8d8c8e4c | 589 | char *dir_name; |
8d8c8e4c MH |
590 | int ret = 0; |
591 | ||
f045b8c4 | 592 | dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); |
d65444d2 MH |
593 | if (!dir_name) |
594 | return -ENOMEM; | |
8d8c8e4c | 595 | |
d65444d2 MH |
596 | *result = lsdir(dir_name, lsdir_no_dot_filter); |
597 | if (!*result) | |
8d8c8e4c | 598 | ret = -errno; |
8d8c8e4c | 599 | free(dir_name); |
8d8c8e4c MH |
600 | |
601 | return ret; | |
602 | } | |
603 | ||
1c1a3a47 | 604 | #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) |
6430a94e | 605 | static int build_id_cache__add_sdt_cache(const char *sbuild_id, |
f045b8c4 KJ |
606 | const char *realname, |
607 | struct nsinfo *nsi) | |
6430a94e MH |
608 | { |
609 | struct probe_cache *cache; | |
610 | int ret; | |
f045b8c4 | 611 | struct nscookie nsc; |
6430a94e | 612 | |
f045b8c4 | 613 | cache = probe_cache__new(sbuild_id, nsi); |
6430a94e MH |
614 | if (!cache) |
615 | return -1; | |
616 | ||
f045b8c4 | 617 | nsinfo__mountns_enter(nsi, &nsc); |
6430a94e | 618 | ret = probe_cache__scan_sdt(cache, realname); |
f045b8c4 | 619 | nsinfo__mountns_exit(&nsc); |
6430a94e | 620 | if (ret >= 0) { |
f9655200 | 621 | pr_debug4("Found %d SDTs in %s\n", ret, realname); |
6430a94e MH |
622 | if (probe_cache__commit(cache) < 0) |
623 | ret = -1; | |
624 | } | |
625 | probe_cache__delete(cache); | |
626 | return ret; | |
627 | } | |
628 | #else | |
f045b8c4 | 629 | #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) |
6430a94e MH |
630 | #endif |
631 | ||
d2396999 KJ |
632 | static char *build_id_cache__find_debug(const char *sbuild_id, |
633 | struct nsinfo *nsi) | |
634 | { | |
635 | char *realname = NULL; | |
636 | char *debugfile; | |
637 | struct nscookie nsc; | |
638 | size_t len = 0; | |
639 | ||
640 | debugfile = calloc(1, PATH_MAX); | |
641 | if (!debugfile) | |
642 | goto out; | |
643 | ||
644 | len = __symbol__join_symfs(debugfile, PATH_MAX, | |
645 | "/usr/lib/debug/.build-id/"); | |
646 | snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, | |
647 | sbuild_id + 2); | |
648 | ||
649 | nsinfo__mountns_enter(nsi, &nsc); | |
650 | realname = realpath(debugfile, NULL); | |
651 | if (realname && access(realname, R_OK)) | |
652 | zfree(&realname); | |
653 | nsinfo__mountns_exit(&nsc); | |
c7a14fdc FCE |
654 | |
655 | #ifdef HAVE_DEBUGINFOD_SUPPORT | |
656 | if (realname == NULL) { | |
657 | debuginfod_client* c = debuginfod_begin(); | |
658 | if (c != NULL) { | |
659 | int fd = debuginfod_find_debuginfo(c, | |
660 | (const unsigned char*)sbuild_id, 0, | |
661 | &realname); | |
662 | if (fd >= 0) | |
663 | close(fd); /* retaining reference by realname */ | |
664 | debuginfod_end(c); | |
665 | } | |
666 | } | |
667 | #endif | |
668 | ||
d2396999 KJ |
669 | out: |
670 | free(debugfile); | |
671 | return realname; | |
672 | } | |
673 | ||
fd4ebb45 JO |
674 | int |
675 | build_id_cache__add(const char *sbuild_id, const char *name, const char *realname, | |
676 | struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) | |
e195fac8 NK |
677 | { |
678 | const size_t size = PATH_MAX; | |
fd4ebb45 | 679 | char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp; |
d2396999 | 680 | char *debugfile = NULL; |
8d8c8e4c | 681 | int err = -1; |
e195fac8 | 682 | |
f045b8c4 KJ |
683 | dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, |
684 | is_vdso); | |
8d8c8e4c | 685 | if (!dir_name) |
e195fac8 NK |
686 | goto out_free; |
687 | ||
01412261 MH |
688 | /* Remove old style build-id cache */ |
689 | if (is_regular_file(dir_name)) | |
690 | if (unlink(dir_name)) | |
691 | goto out_free; | |
692 | ||
8d8c8e4c | 693 | if (mkdir_p(dir_name, 0755)) |
e195fac8 NK |
694 | goto out_free; |
695 | ||
01412261 MH |
696 | /* Save the allocated buildid dirname */ |
697 | if (asprintf(&filename, "%s/%s", dir_name, | |
d2396999 KJ |
698 | build_id_cache__basename(is_kallsyms, is_vdso, |
699 | false)) < 0) { | |
8d8c8e4c MH |
700 | filename = NULL; |
701 | goto out_free; | |
702 | } | |
e195fac8 NK |
703 | |
704 | if (access(filename, F_OK)) { | |
705 | if (is_kallsyms) { | |
f045b8c4 KJ |
706 | if (copyfile("/proc/kallsyms", filename)) |
707 | goto out_free; | |
708 | } else if (nsi && nsi->need_setns) { | |
709 | if (copyfile_ns(name, filename, nsi)) | |
e195fac8 | 710 | goto out_free; |
0635b0f7 MV |
711 | } else if (link(realname, filename) && errno != EEXIST && |
712 | copyfile(name, filename)) | |
e195fac8 NK |
713 | goto out_free; |
714 | } | |
715 | ||
d2396999 KJ |
716 | /* Some binaries are stripped, but have .debug files with their symbol |
717 | * table. Check to see if we can locate one of those, since the elf | |
718 | * file itself may not be very useful to users of our tools without a | |
719 | * symtab. | |
720 | */ | |
721 | if (!is_kallsyms && !is_vdso && | |
722 | strncmp(".ko", name + strlen(name) - 3, 3)) { | |
723 | debugfile = build_id_cache__find_debug(sbuild_id, nsi); | |
724 | if (debugfile) { | |
725 | zfree(&filename); | |
726 | if (asprintf(&filename, "%s/%s", dir_name, | |
727 | build_id_cache__basename(false, false, true)) < 0) { | |
728 | filename = NULL; | |
729 | goto out_free; | |
730 | } | |
731 | if (access(filename, F_OK)) { | |
732 | if (nsi && nsi->need_setns) { | |
733 | if (copyfile_ns(debugfile, filename, | |
734 | nsi)) | |
735 | goto out_free; | |
736 | } else if (link(debugfile, filename) && | |
737 | errno != EEXIST && | |
738 | copyfile(debugfile, filename)) | |
739 | goto out_free; | |
740 | } | |
741 | } | |
742 | } | |
743 | ||
01412261 | 744 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd MH |
745 | goto out_free; |
746 | tmp = strrchr(linkname, '/'); | |
747 | *tmp = '\0'; | |
e195fac8 NK |
748 | |
749 | if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) | |
750 | goto out_free; | |
751 | ||
5cb113fd | 752 | *tmp = '/'; |
01412261 MH |
753 | tmp = dir_name + strlen(buildid_dir) - 5; |
754 | memcpy(tmp, "../..", 5); | |
e195fac8 | 755 | |
af21c579 | 756 | if (symlink(tmp, linkname) == 0) { |
e195fac8 | 757 | err = 0; |
af21c579 JO |
758 | } else if (errno == EEXIST) { |
759 | char path[PATH_MAX]; | |
760 | ssize_t len; | |
761 | ||
762 | len = readlink(linkname, path, sizeof(path) - 1); | |
763 | if (len <= 0) { | |
764 | pr_err("Cant read link: %s\n", linkname); | |
765 | goto out_free; | |
766 | } | |
767 | path[len] = '\0'; | |
768 | ||
769 | if (strcmp(tmp, path)) { | |
770 | pr_debug("build <%s> already linked to %s\n", | |
771 | sbuild_id, linkname); | |
772 | } | |
773 | err = 0; | |
774 | } | |
6430a94e MH |
775 | |
776 | /* Update SDT cache : error is just warned */ | |
f045b8c4 KJ |
777 | if (realname && |
778 | build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) | |
f9655200 | 779 | pr_debug4("Failed to update/scan SDT cache for %s\n", realname); |
6430a94e | 780 | |
e195fac8 | 781 | out_free: |
e195fac8 | 782 | free(filename); |
d2396999 | 783 | free(debugfile); |
8d8c8e4c | 784 | free(dir_name); |
e195fac8 NK |
785 | free(linkname); |
786 | return err; | |
787 | } | |
788 | ||
fd4ebb45 JO |
789 | int build_id_cache__add_s(const char *sbuild_id, const char *name, |
790 | struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) | |
791 | { | |
792 | char *realname = NULL; | |
793 | int err = -1; | |
794 | ||
795 | if (!is_kallsyms) { | |
796 | if (!is_vdso) | |
797 | realname = nsinfo__realpath(name, nsi); | |
798 | else | |
799 | realname = realpath(name, NULL); | |
800 | if (!realname) | |
801 | goto out_free; | |
802 | } | |
803 | ||
804 | err = build_id_cache__add(sbuild_id, name, realname, nsi, is_kallsyms, is_vdso); | |
805 | ||
806 | out_free: | |
807 | if (!is_kallsyms) | |
808 | free(realname); | |
809 | return err; | |
810 | } | |
811 | ||
bf541169 | 812 | static int build_id_cache__add_b(const struct build_id *bid, |
f045b8c4 KJ |
813 | const char *name, struct nsinfo *nsi, |
814 | bool is_kallsyms, bool is_vdso) | |
e195fac8 | 815 | { |
d77fac7f | 816 | char sbuild_id[SBUILD_ID_SIZE]; |
e195fac8 | 817 | |
bf541169 | 818 | build_id__sprintf(bid, sbuild_id); |
e195fac8 | 819 | |
f045b8c4 KJ |
820 | return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, |
821 | is_vdso); | |
e195fac8 NK |
822 | } |
823 | ||
a50d11a1 MH |
824 | bool build_id_cache__cached(const char *sbuild_id) |
825 | { | |
826 | bool ret = false; | |
01412261 | 827 | char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); |
a50d11a1 MH |
828 | |
829 | if (filename && !access(filename, F_OK)) | |
830 | ret = true; | |
831 | free(filename); | |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
e35f7362 | 836 | int build_id_cache__remove_s(const char *sbuild_id) |
e195fac8 NK |
837 | { |
838 | const size_t size = PATH_MAX; | |
839 | char *filename = zalloc(size), | |
5cb113fd | 840 | *linkname = zalloc(size), *tmp; |
e195fac8 NK |
841 | int err = -1; |
842 | ||
843 | if (filename == NULL || linkname == NULL) | |
844 | goto out_free; | |
845 | ||
01412261 | 846 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd | 847 | goto out_free; |
e195fac8 NK |
848 | |
849 | if (access(linkname, F_OK)) | |
850 | goto out_free; | |
851 | ||
852 | if (readlink(linkname, filename, size - 1) < 0) | |
853 | goto out_free; | |
854 | ||
855 | if (unlink(linkname)) | |
856 | goto out_free; | |
857 | ||
858 | /* | |
859 | * Since the link is relative, we must make it absolute: | |
860 | */ | |
5cb113fd MH |
861 | tmp = strrchr(linkname, '/') + 1; |
862 | snprintf(tmp, size - (tmp - linkname), "%s", filename); | |
e195fac8 | 863 | |
01412261 | 864 | if (rm_rf(linkname)) |
e195fac8 NK |
865 | goto out_free; |
866 | ||
867 | err = 0; | |
868 | out_free: | |
869 | free(filename); | |
870 | free(linkname); | |
871 | return err; | |
872 | } | |
873 | ||
0b7b9e83 JO |
874 | static int dso__cache_build_id(struct dso *dso, struct machine *machine, |
875 | void *priv __maybe_unused) | |
e195fac8 | 876 | { |
01412261 | 877 | bool is_kallsyms = dso__is_kallsyms(dso); |
e195fac8 NK |
878 | bool is_vdso = dso__is_vdso(dso); |
879 | const char *name = dso->long_name; | |
e195fac8 | 880 | |
0b7b9e83 JO |
881 | if (!dso->has_build_id) |
882 | return 0; | |
883 | ||
e195fac8 NK |
884 | if (dso__is_kcore(dso)) { |
885 | is_kallsyms = true; | |
8c7f1bb3 | 886 | name = machine->mmap_name; |
e195fac8 | 887 | } |
bf541169 JO |
888 | return build_id_cache__add_b(&dso->bid, name, dso->nsinfo, |
889 | is_kallsyms, is_vdso); | |
e195fac8 NK |
890 | } |
891 | ||
0b7b9e83 JO |
892 | static int |
893 | machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv) | |
e195fac8 | 894 | { |
0b7b9e83 JO |
895 | int ret = machine__for_each_dso(&machines->host, fn, priv); |
896 | struct rb_node *nd; | |
e195fac8 | 897 | |
0b7b9e83 JO |
898 | for (nd = rb_first_cached(&machines->guests); nd; |
899 | nd = rb_next(nd)) { | |
900 | struct machine *pos = rb_entry(nd, struct machine, rb_node); | |
e195fac8 | 901 | |
0b7b9e83 JO |
902 | ret |= machine__for_each_dso(pos, fn, priv); |
903 | } | |
904 | return ret ? -1 : 0; | |
e195fac8 NK |
905 | } |
906 | ||
75fb2af6 JO |
907 | int __perf_session__cache_build_ids(struct perf_session *session, |
908 | machine__dso_t fn, void *priv) | |
e195fac8 | 909 | { |
73c5d224 NK |
910 | if (no_buildid_cache) |
911 | return 0; | |
912 | ||
498922ad | 913 | if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
e195fac8 NK |
914 | return -1; |
915 | ||
75fb2af6 JO |
916 | return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0; |
917 | } | |
918 | ||
919 | int perf_session__cache_build_ids(struct perf_session *session) | |
920 | { | |
921 | return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL); | |
e195fac8 NK |
922 | } |
923 | ||
924 | static bool machine__read_build_ids(struct machine *machine, bool with_hits) | |
925 | { | |
3d39ac53 | 926 | return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
e195fac8 NK |
927 | } |
928 | ||
929 | bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) | |
930 | { | |
931 | struct rb_node *nd; | |
932 | bool ret = machine__read_build_ids(&session->machines.host, with_hits); | |
933 | ||
f3acb3a8 DB |
934 | for (nd = rb_first_cached(&session->machines.guests); nd; |
935 | nd = rb_next(nd)) { | |
e195fac8 NK |
936 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
937 | ret |= machine__read_build_ids(pos, with_hits); | |
938 | } | |
939 | ||
940 | return ret; | |
941 | } | |
bf541169 JO |
942 | |
943 | void build_id__init(struct build_id *bid, const u8 *data, size_t size) | |
944 | { | |
945 | WARN_ON(size > BUILD_ID_SIZE); | |
946 | memcpy(bid->data, data, size); | |
947 | bid->size = size; | |
948 | } | |
f45edd86 JO |
949 | |
950 | bool build_id__is_defined(const struct build_id *bid) | |
951 | { | |
952 | return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false; | |
953 | } |