Commit | Line | Data |
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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 | */ | |
fb71c86c | 10 | #include "util.h" // copyfile_ns(), 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> | |
fac583fd | 16 | #include "dso.h" |
7b2567c1 ACM |
17 | #include "build-id.h" |
18 | #include "event.h" | |
40f3b2d2 | 19 | #include "namespaces.h" |
1101f69a | 20 | #include "map.h" |
7b2567c1 | 21 | #include "symbol.h" |
e7ff8920 | 22 | #include "thread.h" |
7b2567c1 | 23 | #include <linux/kernel.h> |
591765fd | 24 | #include "debug.h" |
d20deb64 | 25 | #include "session.h" |
45694aa7 | 26 | #include "tool.h" |
e195fac8 NK |
27 | #include "header.h" |
28 | #include "vdso.h" | |
9a3993d4 | 29 | #include "path.h" |
6430a94e | 30 | #include "probe-file.h" |
8ec20b17 | 31 | #include "strlist.h" |
7b2567c1 | 32 | |
3052ba56 | 33 | #include <linux/ctype.h> |
7f7c536f | 34 | #include <linux/zalloc.h> |
73c5d224 NK |
35 | |
36 | static bool no_buildid_cache; | |
37 | ||
54a3cf59 AV |
38 | int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
39 | union perf_event *event, | |
ef89325f | 40 | struct perf_sample *sample, |
32dcd021 | 41 | struct evsel *evsel __maybe_unused, |
54a3cf59 | 42 | struct machine *machine) |
7b2567c1 ACM |
43 | { |
44 | struct addr_location al; | |
ef89325f | 45 | struct thread *thread = machine__findnew_thread(machine, sample->pid, |
13ce34df | 46 | sample->tid); |
7b2567c1 ACM |
47 | |
48 | if (thread == NULL) { | |
49 | pr_err("problem processing %d event, skipping it.\n", | |
50 | event->header.type); | |
51 | return -1; | |
52 | } | |
53 | ||
71a84b5a | 54 | if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) |
7b2567c1 ACM |
55 | al.map->dso->hit = 1; |
56 | ||
b91fc39f | 57 | thread__put(thread); |
7b2567c1 ACM |
58 | return 0; |
59 | } | |
60 | ||
1d037ca1 | 61 | static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, |
d20deb64 | 62 | union perf_event *event, |
1d037ca1 IT |
63 | struct perf_sample *sample |
64 | __maybe_unused, | |
743eb868 | 65 | struct machine *machine) |
591765fd | 66 | { |
314add6b AH |
67 | struct thread *thread = machine__findnew_thread(machine, |
68 | event->fork.pid, | |
69 | event->fork.tid); | |
591765fd | 70 | |
8115d60c ACM |
71 | dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, |
72 | event->fork.ppid, event->fork.ptid); | |
591765fd | 73 | |
b91fc39f | 74 | if (thread) { |
5e78c69b | 75 | machine__remove_thread(machine, thread); |
b91fc39f ACM |
76 | thread__put(thread); |
77 | } | |
591765fd ACM |
78 | |
79 | return 0; | |
80 | } | |
81 | ||
45694aa7 | 82 | struct perf_tool build_id__mark_dso_hit_ops = { |
7b2567c1 | 83 | .sample = build_id__mark_dso_hit, |
8115d60c | 84 | .mmap = perf_event__process_mmap, |
5c5e854b | 85 | .mmap2 = perf_event__process_mmap2, |
f62d3f0f | 86 | .fork = perf_event__process_fork, |
8115d60c | 87 | .exit = perf_event__exit_del_thread, |
299c3452 SE |
88 | .attr = perf_event__process_attr, |
89 | .build_id = perf_event__process_build_id, | |
1216b65c | 90 | .ordered_events = true, |
7b2567c1 | 91 | }; |
b36f19d5 | 92 | |
ebb296c2 JO |
93 | int build_id__sprintf(const u8 *build_id, int len, char *bf) |
94 | { | |
95 | char *bid = bf; | |
96 | const u8 *raw = build_id; | |
97 | int i; | |
98 | ||
99 | for (i = 0; i < len; ++i) { | |
100 | sprintf(bid, "%02x", *raw); | |
101 | ++raw; | |
102 | bid += 2; | |
103 | } | |
104 | ||
7375e151 | 105 | return (bid - bf) + 1; |
ebb296c2 JO |
106 | } |
107 | ||
0b5a7935 MH |
108 | int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) |
109 | { | |
110 | char notes[PATH_MAX]; | |
111 | u8 build_id[BUILD_ID_SIZE]; | |
112 | int ret; | |
113 | ||
114 | if (!root_dir) | |
115 | root_dir = ""; | |
116 | ||
117 | scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); | |
118 | ||
119 | ret = sysfs__read_build_id(notes, build_id, sizeof(build_id)); | |
120 | if (ret < 0) | |
121 | return ret; | |
122 | ||
123 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
124 | } | |
125 | ||
126 | int filename__sprintf_build_id(const char *pathname, char *sbuild_id) | |
127 | { | |
128 | u8 build_id[BUILD_ID_SIZE]; | |
129 | int ret; | |
130 | ||
131 | ret = filename__read_build_id(pathname, build_id, sizeof(build_id)); | |
132 | if (ret < 0) | |
133 | return ret; | |
134 | else if (ret != sizeof(build_id)) | |
135 | return -EINVAL; | |
136 | ||
137 | return build_id__sprintf(build_id, sizeof(build_id), sbuild_id); | |
138 | } | |
139 | ||
5cb113fd MH |
140 | /* asnprintf consolidates asprintf and snprintf */ |
141 | static int asnprintf(char **strp, size_t size, const char *fmt, ...) | |
142 | { | |
143 | va_list ap; | |
144 | int ret; | |
145 | ||
146 | if (!strp) | |
147 | return -EINVAL; | |
148 | ||
149 | va_start(ap, fmt); | |
150 | if (*strp) | |
151 | ret = vsnprintf(*strp, size, fmt, ap); | |
152 | else | |
153 | ret = vasprintf(strp, fmt, ap); | |
154 | va_end(ap); | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
01412261 MH |
159 | char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, |
160 | size_t size) | |
161 | { | |
01412261 MH |
162 | bool retry_old = true; |
163 | ||
c58c49ac WN |
164 | snprintf(bf, size, "%s/%s/%s/kallsyms", |
165 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
166 | retry: |
167 | if (!access(bf, F_OK)) | |
168 | return bf; | |
01412261 MH |
169 | if (retry_old) { |
170 | /* Try old style kallsyms cache */ | |
c58c49ac WN |
171 | snprintf(bf, size, "%s/%s/%s", |
172 | buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); | |
01412261 MH |
173 | retry_old = false; |
174 | goto retry; | |
175 | } | |
176 | ||
177 | return NULL; | |
178 | } | |
179 | ||
1f3736c9 | 180 | char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) |
5cb113fd MH |
181 | { |
182 | char *tmp = bf; | |
183 | int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, | |
184 | sbuild_id, sbuild_id + 2); | |
185 | if (ret < 0 || (tmp && size < (unsigned int)ret)) | |
186 | return NULL; | |
187 | return bf; | |
188 | } | |
189 | ||
8bde8516 | 190 | /* The caller is responsible to free the returned buffer. */ |
1f3736c9 MH |
191 | char *build_id_cache__origname(const char *sbuild_id) |
192 | { | |
193 | char *linkname; | |
194 | char buf[PATH_MAX]; | |
195 | char *ret = NULL, *p; | |
196 | size_t offs = 5; /* == strlen("../..") */ | |
5a234211 | 197 | ssize_t len; |
1f3736c9 MH |
198 | |
199 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
200 | if (!linkname) | |
201 | return NULL; | |
202 | ||
5a234211 TR |
203 | len = readlink(linkname, buf, sizeof(buf) - 1); |
204 | if (len <= 0) | |
1f3736c9 | 205 | goto out; |
5a234211 TR |
206 | buf[len] = '\0'; |
207 | ||
1f3736c9 MH |
208 | /* The link should be "../..<origpath>/<sbuild_id>" */ |
209 | p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ | |
210 | if (p && (p > buf + offs)) { | |
211 | *p = '\0'; | |
212 | if (buf[offs + 1] == '[') | |
213 | offs++; /* | |
214 | * This is a DSO name, like [kernel.kallsyms]. | |
215 | * Skip the first '/', since this is not the | |
216 | * cache of a regular file. | |
217 | */ | |
218 | ret = strdup(buf + offs); /* Skip "../..[/]" */ | |
219 | } | |
220 | out: | |
221 | free(linkname); | |
222 | return ret; | |
223 | } | |
224 | ||
c3492a3a MH |
225 | /* Check if the given build_id cache is valid on current running system */ |
226 | static bool build_id_cache__valid_id(char *sbuild_id) | |
227 | { | |
228 | char real_sbuild_id[SBUILD_ID_SIZE] = ""; | |
229 | char *pathname; | |
230 | int ret = 0; | |
231 | bool result = false; | |
232 | ||
233 | pathname = build_id_cache__origname(sbuild_id); | |
234 | if (!pathname) | |
235 | return false; | |
236 | ||
237 | if (!strcmp(pathname, DSO__NAME_KALLSYMS)) | |
238 | ret = sysfs__sprintf_build_id("/", real_sbuild_id); | |
239 | else if (pathname[0] == '/') | |
240 | ret = filename__sprintf_build_id(pathname, real_sbuild_id); | |
241 | else | |
242 | ret = -EINVAL; /* Should we support other special DSO cache? */ | |
243 | if (ret >= 0) | |
244 | result = (strcmp(sbuild_id, real_sbuild_id) == 0); | |
245 | free(pathname); | |
246 | ||
247 | return result; | |
248 | } | |
249 | ||
d2396999 KJ |
250 | static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, |
251 | bool is_debug) | |
01412261 | 252 | { |
d2396999 KJ |
253 | return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? |
254 | "debug" : "elf")); | |
01412261 MH |
255 | } |
256 | ||
d2396999 KJ |
257 | char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
258 | bool is_debug) | |
b36f19d5 | 259 | { |
01412261 MH |
260 | bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); |
261 | bool is_vdso = dso__is_vdso((struct dso *)dso); | |
262 | char sbuild_id[SBUILD_ID_SIZE]; | |
263 | char *linkname; | |
264 | bool alloc = (bf == NULL); | |
265 | int ret; | |
b36f19d5 | 266 | |
c824c433 | 267 | if (!dso->has_build_id) |
b36f19d5 ACM |
268 | return NULL; |
269 | ||
01412261 MH |
270 | build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
271 | linkname = build_id_cache__linkname(sbuild_id, NULL, 0); | |
272 | if (!linkname) | |
273 | return NULL; | |
274 | ||
275 | /* Check if old style build_id cache */ | |
276 | if (is_regular_file(linkname)) | |
277 | ret = asnprintf(&bf, size, "%s", linkname); | |
278 | else | |
279 | ret = asnprintf(&bf, size, "%s/%s", linkname, | |
d2396999 KJ |
280 | build_id_cache__basename(is_kallsyms, is_vdso, |
281 | is_debug)); | |
01412261 MH |
282 | if (ret < 0 || (!alloc && size < (unsigned int)ret)) |
283 | bf = NULL; | |
284 | free(linkname); | |
285 | ||
286 | return bf; | |
b36f19d5 | 287 | } |
e195fac8 NK |
288 | |
289 | #define dsos__for_each_with_build_id(pos, head) \ | |
290 | list_for_each_entry(pos, head, node) \ | |
291 | if (!pos->has_build_id) \ | |
292 | continue; \ | |
293 | else | |
294 | ||
295 | static int write_buildid(const char *name, size_t name_len, u8 *build_id, | |
ccebbeb6 | 296 | pid_t pid, u16 misc, struct feat_fd *fd) |
e195fac8 NK |
297 | { |
298 | int err; | |
72932371 | 299 | struct perf_record_header_build_id b; |
e195fac8 NK |
300 | size_t len; |
301 | ||
302 | len = name_len + 1; | |
303 | len = PERF_ALIGN(len, NAME_ALIGN); | |
304 | ||
305 | memset(&b, 0, sizeof(b)); | |
306 | memcpy(&b.build_id, build_id, BUILD_ID_SIZE); | |
307 | b.pid = pid; | |
308 | b.header.misc = misc; | |
309 | b.header.size = sizeof(b) + len; | |
310 | ||
3b8f51a6 | 311 | err = do_write(fd, &b, sizeof(b)); |
e195fac8 NK |
312 | if (err < 0) |
313 | return err; | |
314 | ||
315 | return write_padded(fd, name, name_len + 1, len); | |
316 | } | |
317 | ||
ccebbeb6 DCC |
318 | static int machine__write_buildid_table(struct machine *machine, |
319 | struct feat_fd *fd) | |
e195fac8 | 320 | { |
3d39ac53 | 321 | int err = 0; |
e195fac8 | 322 | struct dso *pos; |
3d39ac53 ACM |
323 | u16 kmisc = PERF_RECORD_MISC_KERNEL, |
324 | umisc = PERF_RECORD_MISC_USER; | |
325 | ||
326 | if (!machine__is_host(machine)) { | |
327 | kmisc = PERF_RECORD_MISC_GUEST_KERNEL; | |
328 | umisc = PERF_RECORD_MISC_GUEST_USER; | |
329 | } | |
e195fac8 | 330 | |
3d39ac53 | 331 | dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
e195fac8 NK |
332 | const char *name; |
333 | size_t name_len; | |
fd786fac | 334 | bool in_kernel = false; |
e195fac8 | 335 | |
6ae98ba6 | 336 | if (!pos->hit && !dso__is_vdso(pos)) |
e195fac8 NK |
337 | continue; |
338 | ||
339 | if (dso__is_vdso(pos)) { | |
340 | name = pos->short_name; | |
70a2cba9 | 341 | name_len = pos->short_name_len; |
e195fac8 | 342 | } else if (dso__is_kcore(pos)) { |
8c7f1bb3 JO |
343 | name = machine->mmap_name; |
344 | name_len = strlen(name); | |
e195fac8 NK |
345 | } else { |
346 | name = pos->long_name; | |
70a2cba9 | 347 | name_len = pos->long_name_len; |
e195fac8 NK |
348 | } |
349 | ||
fd786fac WN |
350 | in_kernel = pos->kernel || |
351 | is_kernel_module(name, | |
352 | PERF_RECORD_MISC_CPUMODE_UNKNOWN); | |
3d39ac53 | 353 | err = write_buildid(name, name_len, pos->build_id, machine->pid, |
fd786fac | 354 | in_kernel ? kmisc : umisc, fd); |
e195fac8 | 355 | if (err) |
3d39ac53 | 356 | break; |
e195fac8 NK |
357 | } |
358 | ||
e195fac8 NK |
359 | return err; |
360 | } | |
361 | ||
ccebbeb6 DCC |
362 | int perf_session__write_buildid_table(struct perf_session *session, |
363 | struct feat_fd *fd) | |
e195fac8 NK |
364 | { |
365 | struct rb_node *nd; | |
366 | int err = machine__write_buildid_table(&session->machines.host, fd); | |
367 | ||
368 | if (err) | |
369 | return err; | |
370 | ||
f3acb3a8 DB |
371 | for (nd = rb_first_cached(&session->machines.guests); nd; |
372 | nd = rb_next(nd)) { | |
e195fac8 NK |
373 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
374 | err = machine__write_buildid_table(pos, fd); | |
375 | if (err) | |
376 | break; | |
377 | } | |
378 | return err; | |
379 | } | |
380 | ||
381 | static int __dsos__hit_all(struct list_head *head) | |
382 | { | |
383 | struct dso *pos; | |
384 | ||
385 | list_for_each_entry(pos, head, node) | |
386 | pos->hit = true; | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | static int machine__hit_all_dsos(struct machine *machine) | |
392 | { | |
3d39ac53 | 393 | return __dsos__hit_all(&machine->dsos.head); |
e195fac8 NK |
394 | } |
395 | ||
396 | int dsos__hit_all(struct perf_session *session) | |
397 | { | |
398 | struct rb_node *nd; | |
399 | int err; | |
400 | ||
401 | err = machine__hit_all_dsos(&session->machines.host); | |
402 | if (err) | |
403 | return err; | |
404 | ||
f3acb3a8 DB |
405 | for (nd = rb_first_cached(&session->machines.guests); nd; |
406 | nd = rb_next(nd)) { | |
e195fac8 NK |
407 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
408 | ||
409 | err = machine__hit_all_dsos(pos); | |
410 | if (err) | |
411 | return err; | |
412 | } | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
73c5d224 NK |
417 | void disable_buildid_cache(void) |
418 | { | |
419 | no_buildid_cache = true; | |
420 | } | |
421 | ||
1f3736c9 | 422 | static bool lsdir_bid_head_filter(const char *name __maybe_unused, |
767fe71b | 423 | struct dirent *d) |
1f3736c9 MH |
424 | { |
425 | return (strlen(d->d_name) == 2) && | |
426 | isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); | |
427 | } | |
428 | ||
429 | static bool lsdir_bid_tail_filter(const char *name __maybe_unused, | |
767fe71b | 430 | struct dirent *d) |
1f3736c9 MH |
431 | { |
432 | int i = 0; | |
433 | while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) | |
434 | i++; | |
435 | return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0'); | |
436 | } | |
437 | ||
c3492a3a | 438 | struct strlist *build_id_cache__list_all(bool validonly) |
1f3736c9 MH |
439 | { |
440 | struct strlist *toplist, *linklist = NULL, *bidlist; | |
441 | struct str_node *nd, *nd2; | |
442 | char *topdir, *linkdir = NULL; | |
443 | char sbuild_id[SBUILD_ID_SIZE]; | |
444 | ||
c3492a3a MH |
445 | /* for filename__ functions */ |
446 | if (validonly) | |
447 | symbol__init(NULL); | |
448 | ||
1f3736c9 MH |
449 | /* Open the top-level directory */ |
450 | if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) | |
451 | return NULL; | |
452 | ||
453 | bidlist = strlist__new(NULL, NULL); | |
454 | if (!bidlist) | |
455 | goto out; | |
456 | ||
457 | toplist = lsdir(topdir, lsdir_bid_head_filter); | |
458 | if (!toplist) { | |
459 | pr_debug("Error in lsdir(%s): %d\n", topdir, errno); | |
460 | /* If there is no buildid cache, return an empty list */ | |
461 | if (errno == ENOENT) | |
462 | goto out; | |
463 | goto err_out; | |
464 | } | |
465 | ||
466 | strlist__for_each_entry(nd, toplist) { | |
467 | if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) | |
468 | goto err_out; | |
469 | /* Open the lower-level directory */ | |
470 | linklist = lsdir(linkdir, lsdir_bid_tail_filter); | |
471 | if (!linklist) { | |
472 | pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); | |
473 | goto err_out; | |
474 | } | |
475 | strlist__for_each_entry(nd2, linklist) { | |
476 | if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", | |
477 | nd->s, nd2->s) != SBUILD_ID_SIZE - 1) | |
478 | goto err_out; | |
c3492a3a MH |
479 | if (validonly && !build_id_cache__valid_id(sbuild_id)) |
480 | continue; | |
1f3736c9 MH |
481 | if (strlist__add(bidlist, sbuild_id) < 0) |
482 | goto err_out; | |
483 | } | |
484 | strlist__delete(linklist); | |
485 | zfree(&linkdir); | |
486 | } | |
487 | ||
488 | out_free: | |
489 | strlist__delete(toplist); | |
490 | out: | |
491 | free(topdir); | |
492 | ||
493 | return bidlist; | |
494 | ||
495 | err_out: | |
496 | strlist__delete(linklist); | |
497 | zfree(&linkdir); | |
498 | strlist__delete(bidlist); | |
499 | bidlist = NULL; | |
500 | goto out_free; | |
501 | } | |
502 | ||
a598180a MH |
503 | static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) |
504 | { | |
505 | size_t i; | |
506 | ||
507 | for (i = 0; i < len; i++) { | |
508 | if (!isxdigit(maybe_sbuild_id[i])) | |
509 | return false; | |
510 | } | |
511 | return true; | |
512 | } | |
513 | ||
514 | /* Return the valid complete build-id */ | |
515 | char *build_id_cache__complement(const char *incomplete_sbuild_id) | |
516 | { | |
517 | struct strlist *bidlist; | |
518 | struct str_node *nd, *cand = NULL; | |
519 | char *sbuild_id = NULL; | |
520 | size_t len = strlen(incomplete_sbuild_id); | |
521 | ||
522 | if (len >= SBUILD_ID_SIZE || | |
523 | !str_is_build_id(incomplete_sbuild_id, len)) | |
524 | return NULL; | |
525 | ||
526 | bidlist = build_id_cache__list_all(true); | |
527 | if (!bidlist) | |
528 | return NULL; | |
529 | ||
530 | strlist__for_each_entry(nd, bidlist) { | |
531 | if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) | |
532 | continue; | |
533 | if (cand) { /* Error: There are more than 2 candidates. */ | |
534 | cand = NULL; | |
535 | break; | |
536 | } | |
537 | cand = nd; | |
538 | } | |
539 | if (cand) | |
540 | sbuild_id = strdup(cand->s); | |
541 | strlist__delete(bidlist); | |
542 | ||
543 | return sbuild_id; | |
544 | } | |
545 | ||
4698b8b7 | 546 | char *build_id_cache__cachedir(const char *sbuild_id, const char *name, |
f045b8c4 KJ |
547 | struct nsinfo *nsi, bool is_kallsyms, |
548 | bool is_vdso) | |
8d8c8e4c MH |
549 | { |
550 | char *realname = (char *)name, *filename; | |
551 | bool slash = is_kallsyms || is_vdso; | |
552 | ||
553 | if (!slash) { | |
f045b8c4 | 554 | realname = nsinfo__realpath(name, nsi); |
8d8c8e4c MH |
555 | if (!realname) |
556 | return NULL; | |
557 | } | |
558 | ||
01412261 MH |
559 | if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", |
560 | is_vdso ? DSO__NAME_VDSO : realname, | |
561 | sbuild_id ? "/" : "", sbuild_id ?: "") < 0) | |
8d8c8e4c MH |
562 | filename = NULL; |
563 | ||
564 | if (!slash) | |
565 | free(realname); | |
566 | ||
567 | return filename; | |
568 | } | |
569 | ||
f045b8c4 | 570 | int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, |
8d8c8e4c MH |
571 | struct strlist **result) |
572 | { | |
8d8c8e4c | 573 | char *dir_name; |
8d8c8e4c MH |
574 | int ret = 0; |
575 | ||
f045b8c4 | 576 | dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); |
d65444d2 MH |
577 | if (!dir_name) |
578 | return -ENOMEM; | |
8d8c8e4c | 579 | |
d65444d2 MH |
580 | *result = lsdir(dir_name, lsdir_no_dot_filter); |
581 | if (!*result) | |
8d8c8e4c | 582 | ret = -errno; |
8d8c8e4c | 583 | free(dir_name); |
8d8c8e4c MH |
584 | |
585 | return ret; | |
586 | } | |
587 | ||
1c1a3a47 | 588 | #if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) |
6430a94e | 589 | static int build_id_cache__add_sdt_cache(const char *sbuild_id, |
f045b8c4 KJ |
590 | const char *realname, |
591 | struct nsinfo *nsi) | |
6430a94e MH |
592 | { |
593 | struct probe_cache *cache; | |
594 | int ret; | |
f045b8c4 | 595 | struct nscookie nsc; |
6430a94e | 596 | |
f045b8c4 | 597 | cache = probe_cache__new(sbuild_id, nsi); |
6430a94e MH |
598 | if (!cache) |
599 | return -1; | |
600 | ||
f045b8c4 | 601 | nsinfo__mountns_enter(nsi, &nsc); |
6430a94e | 602 | ret = probe_cache__scan_sdt(cache, realname); |
f045b8c4 | 603 | nsinfo__mountns_exit(&nsc); |
6430a94e | 604 | if (ret >= 0) { |
f9655200 | 605 | pr_debug4("Found %d SDTs in %s\n", ret, realname); |
6430a94e MH |
606 | if (probe_cache__commit(cache) < 0) |
607 | ret = -1; | |
608 | } | |
609 | probe_cache__delete(cache); | |
610 | return ret; | |
611 | } | |
612 | #else | |
f045b8c4 | 613 | #define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) |
6430a94e MH |
614 | #endif |
615 | ||
d2396999 KJ |
616 | static char *build_id_cache__find_debug(const char *sbuild_id, |
617 | struct nsinfo *nsi) | |
618 | { | |
619 | char *realname = NULL; | |
620 | char *debugfile; | |
621 | struct nscookie nsc; | |
622 | size_t len = 0; | |
623 | ||
624 | debugfile = calloc(1, PATH_MAX); | |
625 | if (!debugfile) | |
626 | goto out; | |
627 | ||
628 | len = __symbol__join_symfs(debugfile, PATH_MAX, | |
629 | "/usr/lib/debug/.build-id/"); | |
630 | snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, | |
631 | sbuild_id + 2); | |
632 | ||
633 | nsinfo__mountns_enter(nsi, &nsc); | |
634 | realname = realpath(debugfile, NULL); | |
635 | if (realname && access(realname, R_OK)) | |
636 | zfree(&realname); | |
637 | nsinfo__mountns_exit(&nsc); | |
638 | out: | |
639 | free(debugfile); | |
640 | return realname; | |
641 | } | |
642 | ||
e35f7362 | 643 | int build_id_cache__add_s(const char *sbuild_id, const char *name, |
f045b8c4 | 644 | struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) |
e195fac8 NK |
645 | { |
646 | const size_t size = PATH_MAX; | |
8d8c8e4c | 647 | char *realname = NULL, *filename = NULL, *dir_name = NULL, |
01412261 | 648 | *linkname = zalloc(size), *tmp; |
d2396999 | 649 | char *debugfile = NULL; |
8d8c8e4c | 650 | int err = -1; |
e195fac8 | 651 | |
8d8c8e4c | 652 | if (!is_kallsyms) { |
f045b8c4 KJ |
653 | if (!is_vdso) |
654 | realname = nsinfo__realpath(name, nsi); | |
655 | else | |
656 | realname = realpath(name, NULL); | |
8d8c8e4c MH |
657 | if (!realname) |
658 | goto out_free; | |
659 | } | |
e195fac8 | 660 | |
f045b8c4 KJ |
661 | dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, |
662 | is_vdso); | |
8d8c8e4c | 663 | if (!dir_name) |
e195fac8 NK |
664 | goto out_free; |
665 | ||
01412261 MH |
666 | /* Remove old style build-id cache */ |
667 | if (is_regular_file(dir_name)) | |
668 | if (unlink(dir_name)) | |
669 | goto out_free; | |
670 | ||
8d8c8e4c | 671 | if (mkdir_p(dir_name, 0755)) |
e195fac8 NK |
672 | goto out_free; |
673 | ||
01412261 MH |
674 | /* Save the allocated buildid dirname */ |
675 | if (asprintf(&filename, "%s/%s", dir_name, | |
d2396999 KJ |
676 | build_id_cache__basename(is_kallsyms, is_vdso, |
677 | false)) < 0) { | |
8d8c8e4c MH |
678 | filename = NULL; |
679 | goto out_free; | |
680 | } | |
e195fac8 NK |
681 | |
682 | if (access(filename, F_OK)) { | |
683 | if (is_kallsyms) { | |
f045b8c4 KJ |
684 | if (copyfile("/proc/kallsyms", filename)) |
685 | goto out_free; | |
686 | } else if (nsi && nsi->need_setns) { | |
687 | if (copyfile_ns(name, filename, nsi)) | |
e195fac8 | 688 | goto out_free; |
0635b0f7 MV |
689 | } else if (link(realname, filename) && errno != EEXIST && |
690 | copyfile(name, filename)) | |
e195fac8 NK |
691 | goto out_free; |
692 | } | |
693 | ||
d2396999 KJ |
694 | /* Some binaries are stripped, but have .debug files with their symbol |
695 | * table. Check to see if we can locate one of those, since the elf | |
696 | * file itself may not be very useful to users of our tools without a | |
697 | * symtab. | |
698 | */ | |
699 | if (!is_kallsyms && !is_vdso && | |
700 | strncmp(".ko", name + strlen(name) - 3, 3)) { | |
701 | debugfile = build_id_cache__find_debug(sbuild_id, nsi); | |
702 | if (debugfile) { | |
703 | zfree(&filename); | |
704 | if (asprintf(&filename, "%s/%s", dir_name, | |
705 | build_id_cache__basename(false, false, true)) < 0) { | |
706 | filename = NULL; | |
707 | goto out_free; | |
708 | } | |
709 | if (access(filename, F_OK)) { | |
710 | if (nsi && nsi->need_setns) { | |
711 | if (copyfile_ns(debugfile, filename, | |
712 | nsi)) | |
713 | goto out_free; | |
714 | } else if (link(debugfile, filename) && | |
715 | errno != EEXIST && | |
716 | copyfile(debugfile, filename)) | |
717 | goto out_free; | |
718 | } | |
719 | } | |
720 | } | |
721 | ||
01412261 | 722 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd MH |
723 | goto out_free; |
724 | tmp = strrchr(linkname, '/'); | |
725 | *tmp = '\0'; | |
e195fac8 NK |
726 | |
727 | if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) | |
728 | goto out_free; | |
729 | ||
5cb113fd | 730 | *tmp = '/'; |
01412261 MH |
731 | tmp = dir_name + strlen(buildid_dir) - 5; |
732 | memcpy(tmp, "../..", 5); | |
e195fac8 | 733 | |
01412261 | 734 | if (symlink(tmp, linkname) == 0) |
e195fac8 | 735 | err = 0; |
6430a94e MH |
736 | |
737 | /* Update SDT cache : error is just warned */ | |
f045b8c4 KJ |
738 | if (realname && |
739 | build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) | |
f9655200 | 740 | pr_debug4("Failed to update/scan SDT cache for %s\n", realname); |
6430a94e | 741 | |
e195fac8 NK |
742 | out_free: |
743 | if (!is_kallsyms) | |
744 | free(realname); | |
745 | free(filename); | |
d2396999 | 746 | free(debugfile); |
8d8c8e4c | 747 | free(dir_name); |
e195fac8 NK |
748 | free(linkname); |
749 | return err; | |
750 | } | |
751 | ||
752 | static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size, | |
f045b8c4 KJ |
753 | const char *name, struct nsinfo *nsi, |
754 | bool is_kallsyms, bool is_vdso) | |
e195fac8 | 755 | { |
d77fac7f | 756 | char sbuild_id[SBUILD_ID_SIZE]; |
e195fac8 NK |
757 | |
758 | build_id__sprintf(build_id, build_id_size, sbuild_id); | |
759 | ||
f045b8c4 KJ |
760 | return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, |
761 | is_vdso); | |
e195fac8 NK |
762 | } |
763 | ||
a50d11a1 MH |
764 | bool build_id_cache__cached(const char *sbuild_id) |
765 | { | |
766 | bool ret = false; | |
01412261 | 767 | char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); |
a50d11a1 MH |
768 | |
769 | if (filename && !access(filename, F_OK)) | |
770 | ret = true; | |
771 | free(filename); | |
772 | ||
773 | return ret; | |
774 | } | |
775 | ||
e35f7362 | 776 | int build_id_cache__remove_s(const char *sbuild_id) |
e195fac8 NK |
777 | { |
778 | const size_t size = PATH_MAX; | |
779 | char *filename = zalloc(size), | |
5cb113fd | 780 | *linkname = zalloc(size), *tmp; |
e195fac8 NK |
781 | int err = -1; |
782 | ||
783 | if (filename == NULL || linkname == NULL) | |
784 | goto out_free; | |
785 | ||
01412261 | 786 | if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
5cb113fd | 787 | goto out_free; |
e195fac8 NK |
788 | |
789 | if (access(linkname, F_OK)) | |
790 | goto out_free; | |
791 | ||
792 | if (readlink(linkname, filename, size - 1) < 0) | |
793 | goto out_free; | |
794 | ||
795 | if (unlink(linkname)) | |
796 | goto out_free; | |
797 | ||
798 | /* | |
799 | * Since the link is relative, we must make it absolute: | |
800 | */ | |
5cb113fd MH |
801 | tmp = strrchr(linkname, '/') + 1; |
802 | snprintf(tmp, size - (tmp - linkname), "%s", filename); | |
e195fac8 | 803 | |
01412261 | 804 | if (rm_rf(linkname)) |
e195fac8 NK |
805 | goto out_free; |
806 | ||
807 | err = 0; | |
808 | out_free: | |
809 | free(filename); | |
810 | free(linkname); | |
811 | return err; | |
812 | } | |
813 | ||
e35f7362 | 814 | static int dso__cache_build_id(struct dso *dso, struct machine *machine) |
e195fac8 | 815 | { |
01412261 | 816 | bool is_kallsyms = dso__is_kallsyms(dso); |
e195fac8 NK |
817 | bool is_vdso = dso__is_vdso(dso); |
818 | const char *name = dso->long_name; | |
e195fac8 NK |
819 | |
820 | if (dso__is_kcore(dso)) { | |
821 | is_kallsyms = true; | |
8c7f1bb3 | 822 | name = machine->mmap_name; |
e195fac8 NK |
823 | } |
824 | return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name, | |
f045b8c4 | 825 | dso->nsinfo, is_kallsyms, is_vdso); |
e195fac8 NK |
826 | } |
827 | ||
828 | static int __dsos__cache_build_ids(struct list_head *head, | |
e35f7362 | 829 | struct machine *machine) |
e195fac8 NK |
830 | { |
831 | struct dso *pos; | |
832 | int err = 0; | |
833 | ||
834 | dsos__for_each_with_build_id(pos, head) | |
e35f7362 | 835 | if (dso__cache_build_id(pos, machine)) |
e195fac8 NK |
836 | err = -1; |
837 | ||
838 | return err; | |
839 | } | |
840 | ||
e35f7362 | 841 | static int machine__cache_build_ids(struct machine *machine) |
e195fac8 | 842 | { |
3d39ac53 | 843 | return __dsos__cache_build_ids(&machine->dsos.head, machine); |
e195fac8 NK |
844 | } |
845 | ||
846 | int perf_session__cache_build_ids(struct perf_session *session) | |
847 | { | |
848 | struct rb_node *nd; | |
849 | int ret; | |
e195fac8 | 850 | |
73c5d224 NK |
851 | if (no_buildid_cache) |
852 | return 0; | |
853 | ||
498922ad | 854 | if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
e195fac8 NK |
855 | return -1; |
856 | ||
e35f7362 | 857 | ret = machine__cache_build_ids(&session->machines.host); |
e195fac8 | 858 | |
f3acb3a8 DB |
859 | for (nd = rb_first_cached(&session->machines.guests); nd; |
860 | nd = rb_next(nd)) { | |
e195fac8 | 861 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
e35f7362 | 862 | ret |= machine__cache_build_ids(pos); |
e195fac8 NK |
863 | } |
864 | return ret ? -1 : 0; | |
865 | } | |
866 | ||
867 | static bool machine__read_build_ids(struct machine *machine, bool with_hits) | |
868 | { | |
3d39ac53 | 869 | return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
e195fac8 NK |
870 | } |
871 | ||
872 | bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) | |
873 | { | |
874 | struct rb_node *nd; | |
875 | bool ret = machine__read_build_ids(&session->machines.host, with_hits); | |
876 | ||
f3acb3a8 DB |
877 | for (nd = rb_first_cached(&session->machines.guests); nd; |
878 | nd = rb_next(nd)) { | |
e195fac8 NK |
879 | struct machine *pos = rb_entry(nd, struct machine, rb_node); |
880 | ret |= machine__read_build_ids(pos, with_hits); | |
881 | } | |
882 | ||
883 | return ret; | |
884 | } |