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Commit | Line | Data |
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50656eec | 1 | /* |
0e60836b | 2 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
3 | * |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
fd20e811 | 22 | #include <inttypes.h> |
50656eec MH |
23 | #include <sys/utsname.h> |
24 | #include <sys/types.h> | |
25 | #include <sys/stat.h> | |
26 | #include <fcntl.h> | |
27 | #include <errno.h> | |
28 | #include <stdio.h> | |
29 | #include <unistd.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
4de189fe MH |
32 | #include <stdarg.h> |
33 | #include <limits.h> | |
e80711ca | 34 | #include <elf.h> |
50656eec | 35 | |
31facc5f | 36 | #include "util.h" |
50656eec | 37 | #include "event.h" |
4de189fe | 38 | #include "strlist.h" |
8ec20b17 | 39 | #include "strfilter.h" |
50656eec | 40 | #include "debug.h" |
72041334 | 41 | #include "cache.h" |
631c9def | 42 | #include "color.h" |
e0faa8d3 MH |
43 | #include "symbol.h" |
44 | #include "thread.h" | |
4605eab3 | 45 | #include <api/fs/fs.h> |
1d037ca1 | 46 | #include "trace-event.h" /* For __maybe_unused */ |
50656eec | 47 | #include "probe-event.h" |
4235b045 | 48 | #include "probe-finder.h" |
92f6c72e | 49 | #include "probe-file.h" |
225466f1 | 50 | #include "session.h" |
a067558e | 51 | #include "string2.h" |
50656eec | 52 | |
3d689ed6 ACM |
53 | #include "sane_ctype.h" |
54 | ||
50656eec MH |
55 | #define PERFPROBE_GROUP "probe" |
56 | ||
f4d7da49 | 57 | bool probe_event_dry_run; /* Dry run flag */ |
ddb2f58f | 58 | struct probe_conf probe_conf; |
f4d7da49 | 59 | |
146a1439 | 60 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 61 | |
92f6c72e | 62 | int e_snprintf(char *str, size_t size, const char *format, ...) |
4de189fe MH |
63 | { |
64 | int ret; | |
65 | va_list ap; | |
66 | va_start(ap, format); | |
67 | ret = vsnprintf(str, size, format, ap); | |
68 | va_end(ap); | |
69 | if (ret >= (int)size) | |
70 | ret = -E2BIG; | |
71 | return ret; | |
72 | } | |
73 | ||
ee45b6c2 | 74 | static struct machine *host_machine; |
e0faa8d3 | 75 | |
469b9b88 | 76 | /* Initialize symbol maps and path of vmlinux/modules */ |
9bae1e8c | 77 | int init_probe_symbol_maps(bool user_only) |
e0faa8d3 | 78 | { |
146a1439 MH |
79 | int ret; |
80 | ||
e0faa8d3 | 81 | symbol_conf.sort_by_name = true; |
680d926a | 82 | symbol_conf.allow_aliases = true; |
0a7e6d1b | 83 | ret = symbol__init(NULL); |
146a1439 MH |
84 | if (ret < 0) { |
85 | pr_debug("Failed to init symbol map.\n"); | |
86 | goto out; | |
87 | } | |
e0faa8d3 | 88 | |
ee45b6c2 MH |
89 | if (host_machine || user_only) /* already initialized */ |
90 | return 0; | |
d28c6223 | 91 | |
ee45b6c2 MH |
92 | if (symbol_conf.vmlinux_name) |
93 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
94 | ||
95 | host_machine = machine__new_host(); | |
96 | if (!host_machine) { | |
97 | pr_debug("machine__new_host() failed.\n"); | |
98 | symbol__exit(); | |
99 | ret = -1; | |
469b9b88 | 100 | } |
146a1439 MH |
101 | out: |
102 | if (ret < 0) | |
103 | pr_warning("Failed to init vmlinux path.\n"); | |
104 | return ret; | |
e0faa8d3 MH |
105 | } |
106 | ||
9bae1e8c | 107 | void exit_probe_symbol_maps(void) |
ee45b6c2 | 108 | { |
32ca678d ACM |
109 | machine__delete(host_machine); |
110 | host_machine = NULL; | |
ee45b6c2 MH |
111 | symbol__exit(); |
112 | } | |
113 | ||
8f33f7de MH |
114 | static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void) |
115 | { | |
116 | /* kmap->ref_reloc_sym should be set if host_machine is initialized */ | |
117 | struct kmap *kmap; | |
a5e813c6 | 118 | struct map *map = machine__kernel_map(host_machine); |
8f33f7de | 119 | |
be39db9f | 120 | if (map__load(map) < 0) |
8f33f7de MH |
121 | return NULL; |
122 | ||
77e65977 | 123 | kmap = map__kmap(map); |
ba92732e WN |
124 | if (!kmap) |
125 | return NULL; | |
8f33f7de MH |
126 | return kmap->ref_reloc_sym; |
127 | } | |
128 | ||
9b239a12 MH |
129 | static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, |
130 | bool reloc, bool reladdr) | |
8f33f7de MH |
131 | { |
132 | struct ref_reloc_sym *reloc_sym; | |
133 | struct symbol *sym; | |
134 | struct map *map; | |
135 | ||
136 | /* ref_reloc_sym is just a label. Need a special fix*/ | |
137 | reloc_sym = kernel_get_ref_reloc_sym(); | |
138 | if (reloc_sym && strcmp(name, reloc_sym->name) == 0) | |
9b239a12 | 139 | *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr; |
8f33f7de | 140 | else { |
107cad95 | 141 | sym = machine__find_kernel_symbol_by_name(host_machine, name, &map); |
9b239a12 MH |
142 | if (!sym) |
143 | return -ENOENT; | |
144 | *addr = map->unmap_ip(map, sym->start) - | |
145 | ((reloc) ? 0 : map->reloc) - | |
146 | ((reladdr) ? map->start : 0); | |
8f33f7de MH |
147 | } |
148 | return 0; | |
149 | } | |
150 | ||
e80711ca MH |
151 | static struct map *kernel_get_module_map(const char *module) |
152 | { | |
68a74186 | 153 | struct maps *maps = machine__kernel_maps(host_machine); |
4bb7123d | 154 | struct map *pos; |
e80711ca | 155 | |
14a8fd7c MH |
156 | /* A file path -- this is an offline module */ |
157 | if (module && strchr(module, '/')) | |
eebc509b | 158 | return dso__new_map(module); |
14a8fd7c | 159 | |
e80711ca MH |
160 | if (!module) |
161 | module = "kernel"; | |
162 | ||
4bb7123d | 163 | for (pos = maps__first(maps); pos; pos = map__next(pos)) { |
cb3f3378 | 164 | /* short_name is "[module]" */ |
e80711ca | 165 | if (strncmp(pos->dso->short_name + 1, module, |
cb3f3378 KK |
166 | pos->dso->short_name_len - 2) == 0 && |
167 | module[pos->dso->short_name_len - 2] == '\0') { | |
f622df5e | 168 | return map__get(pos); |
e80711ca MH |
169 | } |
170 | } | |
171 | return NULL; | |
172 | } | |
173 | ||
544abd44 | 174 | struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) |
9b118aca MH |
175 | { |
176 | /* Init maps of given executable or kernel */ | |
544abd44 KJ |
177 | if (user) { |
178 | struct map *map; | |
179 | ||
180 | map = dso__new_map(target); | |
181 | if (map && map->dso) | |
182 | map->dso->nsinfo = nsinfo__get(nsi); | |
183 | return map; | |
184 | } else { | |
9b118aca | 185 | return kernel_get_module_map(target); |
544abd44 | 186 | } |
9b118aca MH |
187 | } |
188 | ||
fb7345bb MH |
189 | static int convert_exec_to_group(const char *exec, char **result) |
190 | { | |
191 | char *ptr1, *ptr2, *exec_copy; | |
192 | char buf[64]; | |
193 | int ret; | |
194 | ||
195 | exec_copy = strdup(exec); | |
196 | if (!exec_copy) | |
197 | return -ENOMEM; | |
198 | ||
199 | ptr1 = basename(exec_copy); | |
200 | if (!ptr1) { | |
201 | ret = -EINVAL; | |
202 | goto out; | |
203 | } | |
204 | ||
ead1a574 | 205 | for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { |
35726d3a MH |
206 | if (!isalnum(*ptr2) && *ptr2 != '_') { |
207 | *ptr2 = '\0'; | |
208 | break; | |
209 | } | |
210 | } | |
211 | ||
fb7345bb MH |
212 | ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); |
213 | if (ret < 0) | |
214 | goto out; | |
215 | ||
216 | *result = strdup(buf); | |
217 | ret = *result ? 0 : -ENOMEM; | |
218 | ||
219 | out: | |
220 | free(exec_copy); | |
221 | return ret; | |
222 | } | |
223 | ||
9b118aca MH |
224 | static void clear_perf_probe_point(struct perf_probe_point *pp) |
225 | { | |
226 | free(pp->file); | |
227 | free(pp->function); | |
228 | free(pp->lazy_line); | |
229 | } | |
230 | ||
eb948e50 MH |
231 | static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) |
232 | { | |
233 | int i; | |
234 | ||
235 | for (i = 0; i < ntevs; i++) | |
236 | clear_probe_trace_event(tevs + i); | |
237 | } | |
238 | ||
b031220d MH |
239 | static bool kprobe_blacklist__listed(unsigned long address); |
240 | static bool kprobe_warn_out_range(const char *symbol, unsigned long address) | |
241 | { | |
9b239a12 MH |
242 | u64 etext_addr = 0; |
243 | int ret; | |
7c31bb8c | 244 | |
b031220d | 245 | /* Get the address of _etext for checking non-probable text symbol */ |
9b239a12 MH |
246 | ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, |
247 | false, false); | |
7c31bb8c | 248 | |
9b239a12 | 249 | if (ret == 0 && etext_addr < address) |
b031220d MH |
250 | pr_warning("%s is out of .text, skip it.\n", symbol); |
251 | else if (kprobe_blacklist__listed(address)) | |
252 | pr_warning("%s is blacklisted function, skip it.\n", symbol); | |
253 | else | |
254 | return false; | |
255 | ||
256 | return true; | |
257 | } | |
258 | ||
c61fb959 RB |
259 | /* |
260 | * @module can be module name of module file path. In case of path, | |
261 | * inspect elf and find out what is actual module name. | |
262 | * Caller has to free mod_name after using it. | |
263 | */ | |
264 | static char *find_module_name(const char *module) | |
265 | { | |
266 | int fd; | |
267 | Elf *elf; | |
268 | GElf_Ehdr ehdr; | |
269 | GElf_Shdr shdr; | |
270 | Elf_Data *data; | |
271 | Elf_Scn *sec; | |
272 | char *mod_name = NULL; | |
1f2ed153 | 273 | int name_offset; |
c61fb959 RB |
274 | |
275 | fd = open(module, O_RDONLY); | |
276 | if (fd < 0) | |
277 | return NULL; | |
278 | ||
279 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
280 | if (elf == NULL) | |
281 | goto elf_err; | |
282 | ||
283 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
284 | goto ret_err; | |
285 | ||
286 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
287 | ".gnu.linkonce.this_module", NULL); | |
288 | if (!sec) | |
289 | goto ret_err; | |
290 | ||
291 | data = elf_getdata(sec, NULL); | |
292 | if (!data || !data->d_buf) | |
293 | goto ret_err; | |
294 | ||
1f2ed153 MH |
295 | /* |
296 | * NOTE: | |
297 | * '.gnu.linkonce.this_module' section of kernel module elf directly | |
298 | * maps to 'struct module' from linux/module.h. This section contains | |
299 | * actual module name which will be used by kernel after loading it. | |
300 | * But, we cannot use 'struct module' here since linux/module.h is not | |
301 | * exposed to user-space. Offset of 'name' has remained same from long | |
302 | * time, so hardcoding it here. | |
303 | */ | |
304 | if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) | |
305 | name_offset = 12; | |
306 | else /* expect ELFCLASS64 by default */ | |
307 | name_offset = 24; | |
308 | ||
309 | mod_name = strdup((char *)data->d_buf + name_offset); | |
c61fb959 RB |
310 | |
311 | ret_err: | |
312 | elf_end(elf); | |
313 | elf_err: | |
314 | close(fd); | |
315 | return mod_name; | |
316 | } | |
317 | ||
89fe808a | 318 | #ifdef HAVE_DWARF_SUPPORT |
60fb7742 WN |
319 | |
320 | static int kernel_get_module_dso(const char *module, struct dso **pdso) | |
321 | { | |
322 | struct dso *dso; | |
323 | struct map *map; | |
324 | const char *vmlinux_name; | |
325 | int ret = 0; | |
326 | ||
327 | if (module) { | |
266fa2b2 ACM |
328 | char module_name[128]; |
329 | ||
330 | snprintf(module_name, sizeof(module_name), "[%s]", module); | |
83cf774b | 331 | map = map_groups__find_by_name(&host_machine->kmaps, module_name); |
266fa2b2 ACM |
332 | if (map) { |
333 | dso = map->dso; | |
334 | goto found; | |
60fb7742 WN |
335 | } |
336 | pr_debug("Failed to find module %s.\n", module); | |
337 | return -ENOENT; | |
338 | } | |
339 | ||
a5e813c6 | 340 | map = machine__kernel_map(host_machine); |
60fb7742 WN |
341 | dso = map->dso; |
342 | ||
343 | vmlinux_name = symbol_conf.vmlinux_name; | |
344 | dso->load_errno = 0; | |
345 | if (vmlinux_name) | |
be39db9f | 346 | ret = dso__load_vmlinux(dso, map, vmlinux_name, false); |
60fb7742 | 347 | else |
be39db9f | 348 | ret = dso__load_vmlinux_path(dso, map); |
60fb7742 WN |
349 | found: |
350 | *pdso = dso; | |
351 | return ret; | |
352 | } | |
353 | ||
9b118aca MH |
354 | /* |
355 | * Some binaries like glibc have special symbols which are on the symbol | |
356 | * table, but not in the debuginfo. If we can find the address of the | |
357 | * symbol from map, we can translate the address back to the probe point. | |
358 | */ | |
359 | static int find_alternative_probe_point(struct debuginfo *dinfo, | |
360 | struct perf_probe_point *pp, | |
361 | struct perf_probe_point *result, | |
544abd44 KJ |
362 | const char *target, struct nsinfo *nsi, |
363 | bool uprobes) | |
9b118aca MH |
364 | { |
365 | struct map *map = NULL; | |
366 | struct symbol *sym; | |
367 | u64 address = 0; | |
368 | int ret = -ENOENT; | |
369 | ||
370 | /* This can work only for function-name based one */ | |
371 | if (!pp->function || pp->file) | |
372 | return -ENOTSUP; | |
373 | ||
544abd44 | 374 | map = get_target_map(target, nsi, uprobes); |
9b118aca MH |
375 | if (!map) |
376 | return -EINVAL; | |
377 | ||
378 | /* Find the address of given function */ | |
379 | map__for_each_symbol_by_name(map, pp->function, sym) { | |
e6d7c91c MH |
380 | if (uprobes) |
381 | address = sym->start; | |
382 | else | |
8e34189b | 383 | address = map->unmap_ip(map, sym->start) - map->reloc; |
e578da3b | 384 | break; |
9b118aca MH |
385 | } |
386 | if (!address) { | |
387 | ret = -ENOENT; | |
388 | goto out; | |
389 | } | |
f6c15621 WN |
390 | pr_debug("Symbol %s address found : %" PRIx64 "\n", |
391 | pp->function, address); | |
9b118aca MH |
392 | |
393 | ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, | |
394 | result); | |
395 | if (ret <= 0) | |
396 | ret = (!ret) ? -ENOENT : ret; | |
397 | else { | |
398 | result->offset += pp->offset; | |
399 | result->line += pp->line; | |
9d7b45c5 | 400 | result->retprobe = pp->retprobe; |
9b118aca MH |
401 | ret = 0; |
402 | } | |
403 | ||
404 | out: | |
eebc509b | 405 | map__put(map); |
9b118aca MH |
406 | return ret; |
407 | ||
408 | } | |
409 | ||
410 | static int get_alternative_probe_event(struct debuginfo *dinfo, | |
411 | struct perf_probe_event *pev, | |
44225521 | 412 | struct perf_probe_point *tmp) |
9b118aca MH |
413 | { |
414 | int ret; | |
415 | ||
416 | memcpy(tmp, &pev->point, sizeof(*tmp)); | |
417 | memset(&pev->point, 0, sizeof(pev->point)); | |
544abd44 KJ |
418 | ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, |
419 | pev->nsi, pev->uprobes); | |
9b118aca MH |
420 | if (ret < 0) |
421 | memcpy(&pev->point, tmp, sizeof(*tmp)); | |
422 | ||
423 | return ret; | |
424 | } | |
a15ad2f5 | 425 | |
811dd2ae MH |
426 | static int get_alternative_line_range(struct debuginfo *dinfo, |
427 | struct line_range *lr, | |
428 | const char *target, bool user) | |
429 | { | |
6d4a4896 DA |
430 | struct perf_probe_point pp = { .function = lr->function, |
431 | .file = lr->file, | |
432 | .line = lr->start }; | |
433 | struct perf_probe_point result; | |
811dd2ae MH |
434 | int ret, len = 0; |
435 | ||
6d4a4896 DA |
436 | memset(&result, 0, sizeof(result)); |
437 | ||
811dd2ae MH |
438 | if (lr->end != INT_MAX) |
439 | len = lr->end - lr->start; | |
440 | ret = find_alternative_probe_point(dinfo, &pp, &result, | |
544abd44 | 441 | target, NULL, user); |
811dd2ae MH |
442 | if (!ret) { |
443 | lr->function = result.function; | |
444 | lr->file = result.file; | |
445 | lr->start = result.line; | |
446 | if (lr->end != INT_MAX) | |
447 | lr->end = lr->start + len; | |
448 | clear_perf_probe_point(&pp); | |
449 | } | |
450 | return ret; | |
451 | } | |
452 | ||
ff741783 | 453 | /* Open new debuginfo of given module */ |
544abd44 KJ |
454 | static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi, |
455 | bool silent) | |
e0faa8d3 | 456 | { |
a15ad2f5 | 457 | const char *path = module; |
419e8738 MH |
458 | char reason[STRERR_BUFSIZE]; |
459 | struct debuginfo *ret = NULL; | |
460 | struct dso *dso = NULL; | |
544abd44 | 461 | struct nscookie nsc; |
419e8738 | 462 | int err; |
ff741783 | 463 | |
a15ad2f5 | 464 | if (!module || !strchr(module, '/')) { |
419e8738 MH |
465 | err = kernel_get_module_dso(module, &dso); |
466 | if (err < 0) { | |
467 | if (!dso || dso->load_errno == 0) { | |
c8b5f2c9 | 468 | if (!str_error_r(-err, reason, STRERR_BUFSIZE)) |
419e8738 MH |
469 | strcpy(reason, "(unknown)"); |
470 | } else | |
471 | dso__strerror_load(dso, reason, STRERR_BUFSIZE); | |
92561cb7 | 472 | if (!silent) |
419e8738 MH |
473 | pr_err("Failed to find the path for %s: %s\n", |
474 | module ?: "kernel", reason); | |
14a8fd7c MH |
475 | return NULL; |
476 | } | |
419e8738 | 477 | path = dso->long_name; |
e0faa8d3 | 478 | } |
544abd44 | 479 | nsinfo__mountns_enter(nsi, &nsc); |
92561cb7 MH |
480 | ret = debuginfo__new(path); |
481 | if (!ret && !silent) { | |
482 | pr_warning("The %s file has no debug information.\n", path); | |
483 | if (!module || !strtailcmp(path, ".ko")) | |
484 | pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); | |
485 | else | |
486 | pr_warning("Rebuild with -g, "); | |
487 | pr_warning("or install an appropriate debuginfo package.\n"); | |
488 | } | |
544abd44 | 489 | nsinfo__mountns_exit(&nsc); |
92561cb7 | 490 | return ret; |
e0faa8d3 | 491 | } |
4b4da7f7 | 492 | |
7737af01 MH |
493 | /* For caching the last debuginfo */ |
494 | static struct debuginfo *debuginfo_cache; | |
495 | static char *debuginfo_cache_path; | |
496 | ||
497 | static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) | |
498 | { | |
20f49859 MH |
499 | const char *path = module; |
500 | ||
501 | /* If the module is NULL, it should be the kernel. */ | |
502 | if (!module) | |
503 | path = "kernel"; | |
504 | ||
505 | if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) | |
7737af01 MH |
506 | goto out; |
507 | ||
508 | /* Copy module path */ | |
509 | free(debuginfo_cache_path); | |
20f49859 MH |
510 | debuginfo_cache_path = strdup(path); |
511 | if (!debuginfo_cache_path) { | |
512 | debuginfo__delete(debuginfo_cache); | |
513 | debuginfo_cache = NULL; | |
514 | goto out; | |
7737af01 MH |
515 | } |
516 | ||
544abd44 | 517 | debuginfo_cache = open_debuginfo(module, NULL, silent); |
7737af01 MH |
518 | if (!debuginfo_cache) |
519 | zfree(&debuginfo_cache_path); | |
520 | out: | |
521 | return debuginfo_cache; | |
522 | } | |
523 | ||
524 | static void debuginfo_cache__exit(void) | |
525 | { | |
526 | debuginfo__delete(debuginfo_cache); | |
527 | debuginfo_cache = NULL; | |
528 | zfree(&debuginfo_cache_path); | |
529 | } | |
530 | ||
92561cb7 | 531 | |
544abd44 KJ |
532 | static int get_text_start_address(const char *exec, unsigned long *address, |
533 | struct nsinfo *nsi) | |
99ca4233 MH |
534 | { |
535 | Elf *elf; | |
536 | GElf_Ehdr ehdr; | |
537 | GElf_Shdr shdr; | |
538 | int fd, ret = -ENOENT; | |
544abd44 | 539 | struct nscookie nsc; |
99ca4233 | 540 | |
544abd44 | 541 | nsinfo__mountns_enter(nsi, &nsc); |
99ca4233 | 542 | fd = open(exec, O_RDONLY); |
544abd44 | 543 | nsinfo__mountns_exit(&nsc); |
99ca4233 MH |
544 | if (fd < 0) |
545 | return -errno; | |
546 | ||
547 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
062d6c2a MH |
548 | if (elf == NULL) { |
549 | ret = -EINVAL; | |
550 | goto out_close; | |
551 | } | |
99ca4233 MH |
552 | |
553 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
554 | goto out; | |
555 | ||
556 | if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) | |
557 | goto out; | |
558 | ||
559 | *address = shdr.sh_addr - shdr.sh_offset; | |
560 | ret = 0; | |
561 | out: | |
562 | elf_end(elf); | |
062d6c2a MH |
563 | out_close: |
564 | close(fd); | |
565 | ||
99ca4233 MH |
566 | return ret; |
567 | } | |
568 | ||
5a6f6314 MH |
569 | /* |
570 | * Convert trace point to probe point with debuginfo | |
571 | */ | |
572 | static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, | |
573 | struct perf_probe_point *pp, | |
574 | bool is_kprobe) | |
575 | { | |
576 | struct debuginfo *dinfo = NULL; | |
577 | unsigned long stext = 0; | |
578 | u64 addr = tp->address; | |
579 | int ret = -ENOENT; | |
580 | ||
581 | /* convert the address to dwarf address */ | |
582 | if (!is_kprobe) { | |
583 | if (!addr) { | |
584 | ret = -EINVAL; | |
585 | goto error; | |
586 | } | |
544abd44 | 587 | ret = get_text_start_address(tp->module, &stext, NULL); |
5a6f6314 MH |
588 | if (ret < 0) |
589 | goto error; | |
590 | addr += stext; | |
e486367f | 591 | } else if (tp->symbol) { |
9b239a12 MH |
592 | /* If the module is given, this returns relative address */ |
593 | ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, | |
594 | false, !!tp->module); | |
595 | if (ret != 0) | |
5a6f6314 MH |
596 | goto error; |
597 | addr += tp->offset; | |
598 | } | |
599 | ||
600 | pr_debug("try to find information at %" PRIx64 " in %s\n", addr, | |
601 | tp->module ? : "kernel"); | |
602 | ||
bb963e16 | 603 | dinfo = debuginfo_cache__open(tp->module, verbose <= 0); |
7737af01 | 604 | if (dinfo) |
5a6f6314 MH |
605 | ret = debuginfo__find_probe_point(dinfo, |
606 | (unsigned long)addr, pp); | |
7737af01 | 607 | else |
5a6f6314 | 608 | ret = -ENOENT; |
5a6f6314 MH |
609 | |
610 | if (ret > 0) { | |
611 | pp->retprobe = tp->retprobe; | |
612 | return 0; | |
613 | } | |
614 | error: | |
615 | pr_debug("Failed to find corresponding probes from debuginfo.\n"); | |
616 | return ret ? : -ENOENT; | |
617 | } | |
618 | ||
3e96dac7 MH |
619 | /* Adjust symbol name and address */ |
620 | static int post_process_probe_trace_point(struct probe_trace_point *tp, | |
621 | struct map *map, unsigned long offs) | |
622 | { | |
623 | struct symbol *sym; | |
7598f8bc | 624 | u64 addr = tp->address - offs; |
3e96dac7 MH |
625 | |
626 | sym = map__find_symbol(map, addr); | |
627 | if (!sym) | |
628 | return -ENOENT; | |
629 | ||
630 | if (strcmp(sym->name, tp->symbol)) { | |
631 | /* If we have no realname, use symbol for it */ | |
632 | if (!tp->realname) | |
633 | tp->realname = tp->symbol; | |
634 | else | |
635 | free(tp->symbol); | |
636 | tp->symbol = strdup(sym->name); | |
637 | if (!tp->symbol) | |
638 | return -ENOMEM; | |
639 | } | |
640 | tp->offset = addr - sym->start; | |
641 | tp->address -= offs; | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
8a937a25 MH |
646 | /* |
647 | * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions | |
648 | * and generate new symbols with suffixes such as .constprop.N or .isra.N | |
649 | * etc. Since those symbols are not recorded in DWARF, we have to find | |
650 | * correct generated symbols from offline ELF binary. | |
651 | * For online kernel or uprobes we don't need this because those are | |
652 | * rebased on _text, or already a section relative address. | |
653 | */ | |
654 | static int | |
655 | post_process_offline_probe_trace_events(struct probe_trace_event *tevs, | |
656 | int ntevs, const char *pathname) | |
657 | { | |
8a937a25 MH |
658 | struct map *map; |
659 | unsigned long stext = 0; | |
3e96dac7 | 660 | int i, ret = 0; |
8a937a25 MH |
661 | |
662 | /* Prepare a map for offline binary */ | |
663 | map = dso__new_map(pathname); | |
544abd44 | 664 | if (!map || get_text_start_address(pathname, &stext, NULL) < 0) { |
8a937a25 MH |
665 | pr_warning("Failed to get ELF symbols for %s\n", pathname); |
666 | return -EINVAL; | |
667 | } | |
668 | ||
669 | for (i = 0; i < ntevs; i++) { | |
3e96dac7 MH |
670 | ret = post_process_probe_trace_point(&tevs[i].point, |
671 | map, stext); | |
672 | if (ret < 0) | |
673 | break; | |
8a937a25 MH |
674 | } |
675 | map__put(map); | |
676 | ||
3e96dac7 | 677 | return ret; |
8a937a25 MH |
678 | } |
679 | ||
fb7345bb | 680 | static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, |
544abd44 KJ |
681 | int ntevs, const char *exec, |
682 | struct nsinfo *nsi) | |
fb7345bb MH |
683 | { |
684 | int i, ret = 0; | |
eb948e50 | 685 | unsigned long stext = 0; |
fb7345bb MH |
686 | |
687 | if (!exec) | |
688 | return 0; | |
689 | ||
544abd44 | 690 | ret = get_text_start_address(exec, &stext, nsi); |
fb7345bb MH |
691 | if (ret < 0) |
692 | return ret; | |
693 | ||
694 | for (i = 0; i < ntevs && ret >= 0; i++) { | |
adba1634 | 695 | /* point.address is the address of point.symbol + point.offset */ |
eb948e50 | 696 | tevs[i].point.address -= stext; |
fb7345bb | 697 | tevs[i].point.module = strdup(exec); |
eb948e50 | 698 | if (!tevs[i].point.module) { |
fb7345bb MH |
699 | ret = -ENOMEM; |
700 | break; | |
701 | } | |
702 | tevs[i].uprobes = true; | |
703 | } | |
704 | ||
705 | return ret; | |
706 | } | |
707 | ||
613f050d MH |
708 | static int |
709 | post_process_module_probe_trace_events(struct probe_trace_event *tevs, | |
710 | int ntevs, const char *module, | |
711 | struct debuginfo *dinfo) | |
190b57fc | 712 | { |
613f050d | 713 | Dwarf_Addr text_offs = 0; |
14a8fd7c | 714 | int i, ret = 0; |
63a29613 | 715 | char *mod_name = NULL; |
613f050d | 716 | struct map *map; |
14a8fd7c MH |
717 | |
718 | if (!module) | |
719 | return 0; | |
720 | ||
544abd44 | 721 | map = get_target_map(module, NULL, false); |
613f050d MH |
722 | if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) { |
723 | pr_warning("Failed to get ELF symbols for %s\n", module); | |
724 | return -EINVAL; | |
725 | } | |
14a8fd7c | 726 | |
613f050d | 727 | mod_name = find_module_name(module); |
190b57fc | 728 | for (i = 0; i < ntevs; i++) { |
613f050d MH |
729 | ret = post_process_probe_trace_point(&tevs[i].point, |
730 | map, (unsigned long)text_offs); | |
731 | if (ret < 0) | |
732 | break; | |
63a29613 RB |
733 | tevs[i].point.module = |
734 | strdup(mod_name ? mod_name : module); | |
14a8fd7c MH |
735 | if (!tevs[i].point.module) { |
736 | ret = -ENOMEM; | |
737 | break; | |
738 | } | |
190b57fc | 739 | } |
14a8fd7c | 740 | |
63a29613 | 741 | free(mod_name); |
613f050d MH |
742 | map__put(map); |
743 | ||
14a8fd7c | 744 | return ret; |
190b57fc MH |
745 | } |
746 | ||
d820456d RB |
747 | static int |
748 | post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, | |
749 | int ntevs) | |
dfef99cd MH |
750 | { |
751 | struct ref_reloc_sym *reloc_sym; | |
752 | char *tmp; | |
5a51fcd1 | 753 | int i, skipped = 0; |
dfef99cd | 754 | |
428aff82 MH |
755 | /* Skip post process if the target is an offline kernel */ |
756 | if (symbol_conf.ignore_vmlinux_buildid) | |
8a937a25 MH |
757 | return post_process_offline_probe_trace_events(tevs, ntevs, |
758 | symbol_conf.vmlinux_name); | |
428aff82 | 759 | |
8f33f7de | 760 | reloc_sym = kernel_get_ref_reloc_sym(); |
dfef99cd MH |
761 | if (!reloc_sym) { |
762 | pr_warning("Relocated base symbol is not found!\n"); | |
763 | return -EINVAL; | |
764 | } | |
765 | ||
766 | for (i = 0; i < ntevs; i++) { | |
7ab31d94 NR |
767 | if (!tevs[i].point.address) |
768 | continue; | |
769 | if (tevs[i].point.retprobe && !kretprobe_offset_is_supported()) | |
b031220d MH |
770 | continue; |
771 | /* If we found a wrong one, mark it by NULL symbol */ | |
772 | if (kprobe_warn_out_range(tevs[i].point.symbol, | |
773 | tevs[i].point.address)) { | |
774 | tmp = NULL; | |
775 | skipped++; | |
776 | } else { | |
777 | tmp = strdup(reloc_sym->name); | |
778 | if (!tmp) | |
779 | return -ENOMEM; | |
dfef99cd | 780 | } |
b031220d MH |
781 | /* If we have no realname, use symbol for it */ |
782 | if (!tevs[i].point.realname) | |
783 | tevs[i].point.realname = tevs[i].point.symbol; | |
784 | else | |
785 | free(tevs[i].point.symbol); | |
786 | tevs[i].point.symbol = tmp; | |
787 | tevs[i].point.offset = tevs[i].point.address - | |
788 | reloc_sym->unrelocated_addr; | |
dfef99cd | 789 | } |
5a51fcd1 | 790 | return skipped; |
dfef99cd MH |
791 | } |
792 | ||
99e608b5 RB |
793 | void __weak |
794 | arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused, | |
795 | int ntevs __maybe_unused) | |
796 | { | |
797 | } | |
798 | ||
d820456d | 799 | /* Post processing the probe events */ |
99e608b5 RB |
800 | static int post_process_probe_trace_events(struct perf_probe_event *pev, |
801 | struct probe_trace_event *tevs, | |
d820456d | 802 | int ntevs, const char *module, |
613f050d | 803 | bool uprobe, struct debuginfo *dinfo) |
d820456d | 804 | { |
99e608b5 | 805 | int ret; |
d820456d | 806 | |
99e608b5 | 807 | if (uprobe) |
544abd44 KJ |
808 | ret = add_exec_to_probe_trace_events(tevs, ntevs, module, |
809 | pev->nsi); | |
99e608b5 | 810 | else if (module) |
d820456d | 811 | /* Currently ref_reloc_sym based probe is not for drivers */ |
613f050d MH |
812 | ret = post_process_module_probe_trace_events(tevs, ntevs, |
813 | module, dinfo); | |
99e608b5 RB |
814 | else |
815 | ret = post_process_kernel_probe_trace_events(tevs, ntevs); | |
d820456d | 816 | |
99e608b5 RB |
817 | if (ret >= 0) |
818 | arch__post_process_probe_trace_events(pev, ntevs); | |
819 | ||
820 | return ret; | |
d820456d RB |
821 | } |
822 | ||
4b4da7f7 | 823 | /* Try to find perf_probe_event with debuginfo */ |
0e60836b | 824 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 825 | struct probe_trace_event **tevs) |
4b4da7f7 MH |
826 | { |
827 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
9b118aca | 828 | struct perf_probe_point tmp; |
225466f1 | 829 | struct debuginfo *dinfo; |
190b57fc | 830 | int ntevs, ret = 0; |
4b4da7f7 | 831 | |
544abd44 | 832 | dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf); |
ff741783 | 833 | if (!dinfo) { |
92561cb7 | 834 | if (need_dwarf) |
ff741783 | 835 | return -ENOENT; |
ff741783 | 836 | pr_debug("Could not open debuginfo. Try to use symbols.\n"); |
4b4da7f7 MH |
837 | return 0; |
838 | } | |
839 | ||
dfef99cd | 840 | pr_debug("Try to find probe point from debuginfo.\n"); |
ff741783 | 841 | /* Searching trace events corresponding to a probe event */ |
ddb2f58f | 842 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
ff741783 | 843 | |
9b118aca | 844 | if (ntevs == 0) { /* Not found, retry with an alternative */ |
44225521 | 845 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca | 846 | if (!ret) { |
ddb2f58f | 847 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
9b118aca MH |
848 | /* |
849 | * Write back to the original probe_event for | |
850 | * setting appropriate (user given) event name | |
851 | */ | |
852 | clear_perf_probe_point(&pev->point); | |
853 | memcpy(&pev->point, &tmp, sizeof(tmp)); | |
854 | } | |
855 | } | |
856 | ||
146a1439 | 857 | if (ntevs > 0) { /* Succeeded to find trace events */ |
dfef99cd | 858 | pr_debug("Found %d probe_trace_events.\n", ntevs); |
99e608b5 | 859 | ret = post_process_probe_trace_events(pev, *tevs, ntevs, |
613f050d | 860 | pev->target, pev->uprobes, dinfo); |
5a51fcd1 | 861 | if (ret < 0 || ret == ntevs) { |
613f050d | 862 | pr_debug("Post processing failed or all events are skipped. (%d)\n", ret); |
981d05ad MH |
863 | clear_probe_trace_events(*tevs, ntevs); |
864 | zfree(tevs); | |
613f050d | 865 | ntevs = 0; |
981d05ad | 866 | } |
146a1439 | 867 | } |
4b4da7f7 | 868 | |
613f050d MH |
869 | debuginfo__delete(dinfo); |
870 | ||
146a1439 | 871 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
0687eba7 | 872 | pr_warning("Probe point '%s' not found.\n", |
146a1439 | 873 | synthesize_perf_probe_point(&pev->point)); |
0687eba7 | 874 | return -ENOENT; |
613f050d MH |
875 | } else if (ntevs < 0) { |
876 | /* Error path : ntevs < 0 */ | |
877 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); | |
1c0bd0e8 WN |
878 | if (ntevs == -EBADF) |
879 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
880 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
15eca306 | 881 | if (!need_dwarf) { |
0e43e5d2 | 882 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
883 | return 0; |
884 | } | |
4b4da7f7 | 885 | } |
15eca306 | 886 | return ntevs; |
4b4da7f7 MH |
887 | } |
888 | ||
889 | #define LINEBUF_SIZE 256 | |
890 | #define NR_ADDITIONAL_LINES 2 | |
891 | ||
fde52dbd | 892 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 | 893 | { |
5f03cba4 | 894 | char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; |
befe3414 FBH |
895 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
896 | const char *prefix = NULL; | |
4b4da7f7 | 897 | |
befe3414 | 898 | do { |
4b4da7f7 MH |
899 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
900 | goto error; | |
befe3414 FBH |
901 | if (skip) |
902 | continue; | |
903 | if (!prefix) { | |
904 | prefix = show_num ? "%7d " : " "; | |
905 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 906 | } |
befe3414 FBH |
907 | color_fprintf(stdout, color, "%s", buf); |
908 | ||
909 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 910 | |
fde52dbd | 911 | return 1; |
4b4da7f7 | 912 | error: |
fde52dbd | 913 | if (ferror(fp)) { |
5f03cba4 | 914 | pr_warning("File read error: %s\n", |
c8b5f2c9 | 915 | str_error_r(errno, sbuf, sizeof(sbuf))); |
fde52dbd FBH |
916 | return -1; |
917 | } | |
918 | return 0; | |
919 | } | |
146a1439 | 920 | |
fde52dbd FBH |
921 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
922 | { | |
923 | int rv = __show_one_line(fp, l, skip, show_num); | |
924 | if (rv == 0) { | |
925 | pr_warning("Source file is shorter than expected.\n"); | |
926 | rv = -1; | |
927 | } | |
928 | return rv; | |
4b4da7f7 MH |
929 | } |
930 | ||
fde52dbd FBH |
931 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
932 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
933 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
934 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
935 | ||
4b4da7f7 MH |
936 | /* |
937 | * Show line-range always requires debuginfo to find source file and | |
938 | * line number. | |
939 | */ | |
811dd2ae MH |
940 | static int __show_line_range(struct line_range *lr, const char *module, |
941 | bool user) | |
4b4da7f7 | 942 | { |
d3b63d7a | 943 | int l = 1; |
5a62257a | 944 | struct int_node *ln; |
ff741783 | 945 | struct debuginfo *dinfo; |
4b4da7f7 | 946 | FILE *fp; |
ff741783 | 947 | int ret; |
7cf0b79e | 948 | char *tmp; |
5f03cba4 | 949 | char sbuf[STRERR_BUFSIZE]; |
4b4da7f7 MH |
950 | |
951 | /* Search a line range */ | |
544abd44 | 952 | dinfo = open_debuginfo(module, NULL, false); |
92561cb7 | 953 | if (!dinfo) |
ff741783 | 954 | return -ENOENT; |
146a1439 | 955 | |
ff741783 | 956 | ret = debuginfo__find_line_range(dinfo, lr); |
811dd2ae MH |
957 | if (!ret) { /* Not found, retry with an alternative */ |
958 | ret = get_alternative_line_range(dinfo, lr, module, user); | |
959 | if (!ret) | |
960 | ret = debuginfo__find_line_range(dinfo, lr); | |
961 | } | |
ff741783 | 962 | debuginfo__delete(dinfo); |
5ee05b88 | 963 | if (ret == 0 || ret == -ENOENT) { |
146a1439 MH |
964 | pr_warning("Specified source line is not found.\n"); |
965 | return -ENOENT; | |
966 | } else if (ret < 0) { | |
5ee05b88 | 967 | pr_warning("Debuginfo analysis failed.\n"); |
146a1439 MH |
968 | return ret; |
969 | } | |
4b4da7f7 | 970 | |
7cf0b79e MH |
971 | /* Convert source file path */ |
972 | tmp = lr->path; | |
6a330a3c | 973 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
a78604de HK |
974 | |
975 | /* Free old path when new path is assigned */ | |
976 | if (tmp != lr->path) | |
977 | free(tmp); | |
978 | ||
7cf0b79e | 979 | if (ret < 0) { |
5ee05b88 | 980 | pr_warning("Failed to find source file path.\n"); |
7cf0b79e MH |
981 | return ret; |
982 | } | |
983 | ||
4b4da7f7 MH |
984 | setup_pager(); |
985 | ||
986 | if (lr->function) | |
8737ebde | 987 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
4b4da7f7 MH |
988 | lr->start - lr->offset); |
989 | else | |
62c15fc4 | 990 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
991 | |
992 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
993 | if (fp == NULL) { |
994 | pr_warning("Failed to open %s: %s\n", lr->path, | |
c8b5f2c9 | 995 | str_error_r(errno, sbuf, sizeof(sbuf))); |
146a1439 MH |
996 | return -errno; |
997 | } | |
4b4da7f7 | 998 | /* Skip to starting line number */ |
44b81e92 | 999 | while (l < lr->start) { |
fde52dbd | 1000 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
1001 | if (ret < 0) |
1002 | goto end; | |
1003 | } | |
4b4da7f7 | 1004 | |
10daf4d0 | 1005 | intlist__for_each_entry(ln, lr->line_list) { |
5a62257a | 1006 | for (; ln->i > l; l++) { |
fde52dbd | 1007 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
1008 | if (ret < 0) |
1009 | goto end; | |
1010 | } | |
fde52dbd | 1011 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
1012 | if (ret < 0) |
1013 | goto end; | |
4b4da7f7 MH |
1014 | } |
1015 | ||
1016 | if (lr->end == INT_MAX) | |
1017 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
1018 | while (l <= lr->end) { |
1019 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
1020 | if (ret <= 0) | |
44b81e92 FBH |
1021 | break; |
1022 | } | |
146a1439 | 1023 | end: |
4b4da7f7 | 1024 | fclose(fp); |
146a1439 | 1025 | return ret; |
4b4da7f7 MH |
1026 | } |
1027 | ||
544abd44 KJ |
1028 | int show_line_range(struct line_range *lr, const char *module, |
1029 | struct nsinfo *nsi, bool user) | |
ee45b6c2 MH |
1030 | { |
1031 | int ret; | |
544abd44 | 1032 | struct nscookie nsc; |
ee45b6c2 | 1033 | |
9bae1e8c | 1034 | ret = init_probe_symbol_maps(user); |
ee45b6c2 MH |
1035 | if (ret < 0) |
1036 | return ret; | |
544abd44 | 1037 | nsinfo__mountns_enter(nsi, &nsc); |
811dd2ae | 1038 | ret = __show_line_range(lr, module, user); |
544abd44 | 1039 | nsinfo__mountns_exit(&nsc); |
9bae1e8c | 1040 | exit_probe_symbol_maps(); |
ee45b6c2 MH |
1041 | |
1042 | return ret; | |
1043 | } | |
1044 | ||
ff741783 MH |
1045 | static int show_available_vars_at(struct debuginfo *dinfo, |
1046 | struct perf_probe_event *pev, | |
ddb2f58f | 1047 | struct strfilter *_filter) |
cf6eb489 MH |
1048 | { |
1049 | char *buf; | |
bd09d7b5 | 1050 | int ret, i, nvars; |
cf6eb489 MH |
1051 | struct str_node *node; |
1052 | struct variable_list *vls = NULL, *vl; | |
9b118aca | 1053 | struct perf_probe_point tmp; |
bd09d7b5 | 1054 | const char *var; |
cf6eb489 MH |
1055 | |
1056 | buf = synthesize_perf_probe_point(&pev->point); | |
1057 | if (!buf) | |
1058 | return -EINVAL; | |
1059 | pr_debug("Searching variables at %s\n", buf); | |
1060 | ||
ddb2f58f | 1061 | ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); |
9b118aca | 1062 | if (!ret) { /* Not found, retry with an alternative */ |
44225521 | 1063 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca MH |
1064 | if (!ret) { |
1065 | ret = debuginfo__find_available_vars_at(dinfo, pev, | |
ddb2f58f | 1066 | &vls); |
9b118aca MH |
1067 | /* Release the old probe_point */ |
1068 | clear_perf_probe_point(&tmp); | |
1069 | } | |
1070 | } | |
bd09d7b5 | 1071 | if (ret <= 0) { |
69e96eaa MH |
1072 | if (ret == 0 || ret == -ENOENT) { |
1073 | pr_err("Failed to find the address of %s\n", buf); | |
1074 | ret = -ENOENT; | |
1075 | } else | |
1076 | pr_warning("Debuginfo analysis failed.\n"); | |
bd09d7b5 MH |
1077 | goto end; |
1078 | } | |
69e96eaa | 1079 | |
bd09d7b5 MH |
1080 | /* Some variables are found */ |
1081 | fprintf(stdout, "Available variables at %s\n", buf); | |
1082 | for (i = 0; i < ret; i++) { | |
1083 | vl = &vls[i]; | |
1084 | /* | |
1085 | * A probe point might be converted to | |
1086 | * several trace points. | |
1087 | */ | |
1088 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
1089 | vl->point.offset); | |
74cf249d | 1090 | zfree(&vl->point.symbol); |
bd09d7b5 MH |
1091 | nvars = 0; |
1092 | if (vl->vars) { | |
602a1f4d | 1093 | strlist__for_each_entry(node, vl->vars) { |
bd09d7b5 MH |
1094 | var = strchr(node->s, '\t') + 1; |
1095 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 1096 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
1097 | nvars++; |
1098 | } | |
1099 | } | |
1100 | strlist__delete(vl->vars); | |
cf6eb489 | 1101 | } |
bd09d7b5 MH |
1102 | if (nvars == 0) |
1103 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
1104 | } | |
1105 | free(vls); | |
1106 | end: | |
cf6eb489 MH |
1107 | free(buf); |
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | /* Show available variables on given probe point */ | |
1112 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
ddb2f58f | 1113 | struct strfilter *_filter) |
cf6eb489 | 1114 | { |
ff741783 MH |
1115 | int i, ret = 0; |
1116 | struct debuginfo *dinfo; | |
cf6eb489 | 1117 | |
9bae1e8c | 1118 | ret = init_probe_symbol_maps(pevs->uprobes); |
cf6eb489 MH |
1119 | if (ret < 0) |
1120 | return ret; | |
1121 | ||
544abd44 | 1122 | dinfo = open_debuginfo(pevs->target, pevs->nsi, false); |
ff741783 | 1123 | if (!dinfo) { |
ee45b6c2 MH |
1124 | ret = -ENOENT; |
1125 | goto out; | |
ff741783 MH |
1126 | } |
1127 | ||
cf6eb489 MH |
1128 | setup_pager(); |
1129 | ||
ff741783 | 1130 | for (i = 0; i < npevs && ret >= 0; i++) |
ddb2f58f | 1131 | ret = show_available_vars_at(dinfo, &pevs[i], _filter); |
ff741783 MH |
1132 | |
1133 | debuginfo__delete(dinfo); | |
ee45b6c2 | 1134 | out: |
9bae1e8c | 1135 | exit_probe_symbol_maps(); |
cf6eb489 MH |
1136 | return ret; |
1137 | } | |
1138 | ||
89fe808a | 1139 | #else /* !HAVE_DWARF_SUPPORT */ |
4b4da7f7 | 1140 | |
7737af01 MH |
1141 | static void debuginfo_cache__exit(void) |
1142 | { | |
1143 | } | |
1144 | ||
5a6f6314 MH |
1145 | static int |
1146 | find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, | |
1147 | struct perf_probe_point *pp __maybe_unused, | |
1148 | bool is_kprobe __maybe_unused) | |
4b4da7f7 | 1149 | { |
5a6f6314 | 1150 | return -ENOSYS; |
4b4da7f7 MH |
1151 | } |
1152 | ||
0e60836b | 1153 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 1154 | struct probe_trace_event **tevs __maybe_unused) |
4b4da7f7 | 1155 | { |
146a1439 MH |
1156 | if (perf_probe_event_need_dwarf(pev)) { |
1157 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1158 | return -ENOSYS; | |
1159 | } | |
225466f1 | 1160 | |
4b4da7f7 MH |
1161 | return 0; |
1162 | } | |
1163 | ||
1d037ca1 | 1164 | int show_line_range(struct line_range *lr __maybe_unused, |
2b394bc4 | 1165 | const char *module __maybe_unused, |
544abd44 | 1166 | struct nsinfo *nsi __maybe_unused, |
2b394bc4 | 1167 | bool user __maybe_unused) |
4b4da7f7 | 1168 | { |
146a1439 MH |
1169 | pr_warning("Debuginfo-analysis is not supported.\n"); |
1170 | return -ENOSYS; | |
4b4da7f7 MH |
1171 | } |
1172 | ||
1d037ca1 | 1173 | int show_available_vars(struct perf_probe_event *pevs __maybe_unused, |
ddb2f58f MH |
1174 | int npevs __maybe_unused, |
1175 | struct strfilter *filter __maybe_unused) | |
cf6eb489 MH |
1176 | { |
1177 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1178 | return -ENOSYS; | |
1179 | } | |
e0faa8d3 MH |
1180 | #endif |
1181 | ||
e53b00d3 MH |
1182 | void line_range__clear(struct line_range *lr) |
1183 | { | |
e53b00d3 MH |
1184 | free(lr->function); |
1185 | free(lr->file); | |
1186 | free(lr->path); | |
1187 | free(lr->comp_dir); | |
5a62257a | 1188 | intlist__delete(lr->line_list); |
e53b00d3 MH |
1189 | memset(lr, 0, sizeof(*lr)); |
1190 | } | |
1191 | ||
5a62257a | 1192 | int line_range__init(struct line_range *lr) |
e53b00d3 MH |
1193 | { |
1194 | memset(lr, 0, sizeof(*lr)); | |
5a62257a MH |
1195 | lr->line_list = intlist__new(NULL); |
1196 | if (!lr->line_list) | |
1197 | return -ENOMEM; | |
1198 | else | |
1199 | return 0; | |
e53b00d3 MH |
1200 | } |
1201 | ||
21dd9ae5 FBH |
1202 | static int parse_line_num(char **ptr, int *val, const char *what) |
1203 | { | |
1204 | const char *start = *ptr; | |
1205 | ||
1206 | errno = 0; | |
1207 | *val = strtol(*ptr, ptr, 0); | |
1208 | if (errno || *ptr == start) { | |
1209 | semantic_error("'%s' is not a valid number.\n", what); | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | return 0; | |
1213 | } | |
1214 | ||
573709fd MH |
1215 | /* Check the name is good for event, group or function */ |
1216 | static bool is_c_func_name(const char *name) | |
1217 | { | |
1218 | if (!isalpha(*name) && *name != '_') | |
1219 | return false; | |
1220 | while (*++name != '\0') { | |
1221 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1222 | return false; | |
1223 | } | |
1224 | return true; | |
1225 | } | |
1226 | ||
9d95b580 FBH |
1227 | /* |
1228 | * Stuff 'lr' according to the line range described by 'arg'. | |
1229 | * The line range syntax is described by: | |
1230 | * | |
1231 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 1232 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 1233 | */ |
146a1439 | 1234 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 1235 | { |
e116dfa1 | 1236 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
1237 | int err; |
1238 | ||
1239 | if (!name) | |
1240 | return -ENOMEM; | |
1241 | ||
1242 | lr->start = 0; | |
1243 | lr->end = INT_MAX; | |
1244 | ||
1245 | range = strchr(name, ':'); | |
1246 | if (range) { | |
1247 | *range++ = '\0'; | |
1248 | ||
1249 | err = parse_line_num(&range, &lr->start, "start line"); | |
1250 | if (err) | |
1251 | goto err; | |
1252 | ||
1253 | if (*range == '+' || *range == '-') { | |
1254 | const char c = *range++; | |
1255 | ||
1256 | err = parse_line_num(&range, &lr->end, "end line"); | |
1257 | if (err) | |
1258 | goto err; | |
1259 | ||
1260 | if (c == '+') { | |
1261 | lr->end += lr->start; | |
1262 | /* | |
1263 | * Adjust the number of lines here. | |
1264 | * If the number of lines == 1, the | |
1265 | * the end of line should be equal to | |
1266 | * the start of line. | |
1267 | */ | |
1268 | lr->end--; | |
1269 | } | |
1270 | } | |
9d95b580 | 1271 | |
d3b63d7a | 1272 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
1273 | |
1274 | err = -EINVAL; | |
d3b63d7a | 1275 | if (lr->start > lr->end) { |
631c9def | 1276 | semantic_error("Start line must be smaller" |
146a1439 | 1277 | " than end line.\n"); |
21dd9ae5 | 1278 | goto err; |
146a1439 | 1279 | } |
21dd9ae5 FBH |
1280 | if (*range != '\0') { |
1281 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
1282 | goto err; | |
146a1439 | 1283 | } |
d3b63d7a | 1284 | } |
02b95dad | 1285 | |
e116dfa1 MH |
1286 | file = strchr(name, '@'); |
1287 | if (file) { | |
1288 | *file = '\0'; | |
1289 | lr->file = strdup(++file); | |
1290 | if (lr->file == NULL) { | |
1291 | err = -ENOMEM; | |
1292 | goto err; | |
1293 | } | |
1294 | lr->function = name; | |
573709fd | 1295 | } else if (strchr(name, '/') || strchr(name, '.')) |
21dd9ae5 | 1296 | lr->file = name; |
573709fd | 1297 | else if (is_c_func_name(name))/* We reuse it for checking funcname */ |
21dd9ae5 | 1298 | lr->function = name; |
573709fd MH |
1299 | else { /* Invalid name */ |
1300 | semantic_error("'%s' is not a valid function name.\n", name); | |
1301 | err = -EINVAL; | |
1302 | goto err; | |
1303 | } | |
146a1439 MH |
1304 | |
1305 | return 0; | |
21dd9ae5 FBH |
1306 | err: |
1307 | free(name); | |
1308 | return err; | |
631c9def MH |
1309 | } |
1310 | ||
36a009fe MH |
1311 | static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev) |
1312 | { | |
1313 | char *ptr; | |
1314 | ||
c588d158 | 1315 | ptr = strpbrk_esc(*arg, ":"); |
36a009fe MH |
1316 | if (ptr) { |
1317 | *ptr = '\0'; | |
42bba263 | 1318 | if (!pev->sdt && !is_c_func_name(*arg)) |
36a009fe | 1319 | goto ng_name; |
c588d158 | 1320 | pev->group = strdup_esc(*arg); |
36a009fe MH |
1321 | if (!pev->group) |
1322 | return -ENOMEM; | |
1323 | *arg = ptr + 1; | |
1324 | } else | |
1325 | pev->group = NULL; | |
c588d158 MH |
1326 | |
1327 | pev->event = strdup_esc(*arg); | |
1328 | if (pev->event == NULL) | |
1329 | return -ENOMEM; | |
1330 | ||
1331 | if (!pev->sdt && !is_c_func_name(pev->event)) { | |
1332 | zfree(&pev->event); | |
36a009fe | 1333 | ng_name: |
c588d158 | 1334 | zfree(&pev->group); |
36a009fe MH |
1335 | semantic_error("%s is bad for event name -it must " |
1336 | "follow C symbol-naming rule.\n", *arg); | |
1337 | return -EINVAL; | |
1338 | } | |
36a009fe MH |
1339 | return 0; |
1340 | } | |
1341 | ||
50656eec | 1342 | /* Parse probepoint definition. */ |
146a1439 | 1343 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 1344 | { |
4235b045 | 1345 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
1346 | char *ptr, *tmp; |
1347 | char c, nc = 0; | |
3099c026 | 1348 | bool file_spec = false; |
36a009fe MH |
1349 | int ret; |
1350 | ||
50656eec MH |
1351 | /* |
1352 | * <Syntax> | |
8d993d96 MH |
1353 | * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] |
1354 | * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
36a009fe | 1355 | * perf probe %[GRP:]SDT_EVENT |
50656eec | 1356 | */ |
e59d29e8 WN |
1357 | if (!arg) |
1358 | return -EINVAL; | |
50656eec | 1359 | |
af9100ad | 1360 | if (is_sdt_event(arg)) { |
36a009fe | 1361 | pev->sdt = true; |
7e9fca51 MH |
1362 | if (arg[0] == '%') |
1363 | arg++; | |
36a009fe MH |
1364 | } |
1365 | ||
c588d158 | 1366 | ptr = strpbrk_esc(arg, ";=@+%"); |
36a009fe | 1367 | if (pev->sdt) { |
8d993d96 | 1368 | if (ptr) { |
a598180a MH |
1369 | if (*ptr != '@') { |
1370 | semantic_error("%s must be an SDT name.\n", | |
1371 | arg); | |
1372 | return -EINVAL; | |
1373 | } | |
1374 | /* This must be a target file name or build id */ | |
1375 | tmp = build_id_cache__complement(ptr + 1); | |
1376 | if (tmp) { | |
1377 | pev->target = build_id_cache__origname(tmp); | |
1378 | free(tmp); | |
1379 | } else | |
c588d158 | 1380 | pev->target = strdup_esc(ptr + 1); |
a598180a MH |
1381 | if (!pev->target) |
1382 | return -ENOMEM; | |
1383 | *ptr = '\0'; | |
146a1439 | 1384 | } |
36a009fe MH |
1385 | ret = parse_perf_probe_event_name(&arg, pev); |
1386 | if (ret == 0) { | |
1387 | if (asprintf(&pev->point.function, "%%%s", pev->event) < 0) | |
1388 | ret = -errno; | |
1389 | } | |
1390 | return ret; | |
1391 | } | |
1392 | ||
1393 | if (ptr && *ptr == '=') { /* Event name */ | |
1394 | *ptr = '\0'; | |
1395 | tmp = ptr + 1; | |
1396 | ret = parse_perf_probe_event_name(&arg, pev); | |
1397 | if (ret < 0) | |
1398 | return ret; | |
1399 | ||
af663d75 MH |
1400 | arg = tmp; |
1401 | } | |
1402 | ||
3099c026 NR |
1403 | /* |
1404 | * Check arg is function or file name and copy it. | |
1405 | * | |
1406 | * We consider arg to be a file spec if and only if it satisfies | |
1407 | * all of the below criteria:: | |
1408 | * - it does not include any of "+@%", | |
1409 | * - it includes one of ":;", and | |
1410 | * - it has a period '.' in the name. | |
1411 | * | |
1412 | * Otherwise, we consider arg to be a function specification. | |
1413 | */ | |
c588d158 MH |
1414 | if (!strpbrk_esc(arg, "+@%")) { |
1415 | ptr = strpbrk_esc(arg, ";:"); | |
3099c026 | 1416 | /* This is a file spec if it includes a '.' before ; or : */ |
c588d158 | 1417 | if (ptr && memchr(arg, '.', ptr - arg)) |
3099c026 NR |
1418 | file_spec = true; |
1419 | } | |
1420 | ||
c588d158 | 1421 | ptr = strpbrk_esc(arg, ";:+@%"); |
50656eec MH |
1422 | if (ptr) { |
1423 | nc = *ptr; | |
1424 | *ptr++ = '\0'; | |
1425 | } | |
1426 | ||
6c6e024f WN |
1427 | if (arg[0] == '\0') |
1428 | tmp = NULL; | |
1429 | else { | |
c588d158 | 1430 | tmp = strdup_esc(arg); |
6c6e024f WN |
1431 | if (tmp == NULL) |
1432 | return -ENOMEM; | |
1433 | } | |
02b95dad | 1434 | |
3099c026 | 1435 | if (file_spec) |
02b95dad | 1436 | pp->file = tmp; |
da15bd9d | 1437 | else { |
02b95dad | 1438 | pp->function = tmp; |
50656eec | 1439 | |
da15bd9d WN |
1440 | /* |
1441 | * Keep pp->function even if this is absolute address, | |
1442 | * so it can mark whether abs_address is valid. | |
1443 | * Which make 'perf probe lib.bin 0x0' possible. | |
1444 | * | |
1445 | * Note that checking length of tmp is not needed | |
1446 | * because when we access tmp[1] we know tmp[0] is '0', | |
1447 | * so tmp[1] should always valid (but could be '\0'). | |
1448 | */ | |
1449 | if (tmp && !strncmp(tmp, "0x", 2)) { | |
1450 | pp->abs_address = strtoul(pp->function, &tmp, 0); | |
1451 | if (*tmp != '\0') { | |
1452 | semantic_error("Invalid absolute address.\n"); | |
1453 | return -EINVAL; | |
1454 | } | |
1455 | } | |
1456 | } | |
1457 | ||
50656eec MH |
1458 | /* Parse other options */ |
1459 | while (ptr) { | |
1460 | arg = ptr; | |
1461 | c = nc; | |
2a9c8c36 | 1462 | if (c == ';') { /* Lazy pattern must be the last part */ |
c588d158 | 1463 | pp->lazy_line = strdup(arg); /* let leave escapes */ |
02b95dad MH |
1464 | if (pp->lazy_line == NULL) |
1465 | return -ENOMEM; | |
2a9c8c36 MH |
1466 | break; |
1467 | } | |
c588d158 | 1468 | ptr = strpbrk_esc(arg, ";:+@%"); |
50656eec MH |
1469 | if (ptr) { |
1470 | nc = *ptr; | |
1471 | *ptr++ = '\0'; | |
1472 | } | |
1473 | switch (c) { | |
1474 | case ':': /* Line number */ | |
1475 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 1476 | if (*tmp != '\0') { |
2a9c8c36 | 1477 | semantic_error("There is non-digit char" |
146a1439 MH |
1478 | " in line number.\n"); |
1479 | return -EINVAL; | |
1480 | } | |
50656eec MH |
1481 | break; |
1482 | case '+': /* Byte offset from a symbol */ | |
1483 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 1484 | if (*tmp != '\0') { |
2a9c8c36 | 1485 | semantic_error("There is non-digit character" |
146a1439 MH |
1486 | " in offset.\n"); |
1487 | return -EINVAL; | |
1488 | } | |
50656eec MH |
1489 | break; |
1490 | case '@': /* File name */ | |
146a1439 MH |
1491 | if (pp->file) { |
1492 | semantic_error("SRC@SRC is not allowed.\n"); | |
1493 | return -EINVAL; | |
1494 | } | |
c588d158 | 1495 | pp->file = strdup_esc(arg); |
02b95dad MH |
1496 | if (pp->file == NULL) |
1497 | return -ENOMEM; | |
50656eec MH |
1498 | break; |
1499 | case '%': /* Probe places */ | |
1500 | if (strcmp(arg, "return") == 0) { | |
1501 | pp->retprobe = 1; | |
146a1439 MH |
1502 | } else { /* Others not supported yet */ |
1503 | semantic_error("%%%s is not supported.\n", arg); | |
1504 | return -ENOTSUP; | |
1505 | } | |
50656eec | 1506 | break; |
146a1439 MH |
1507 | default: /* Buggy case */ |
1508 | pr_err("This program has a bug at %s:%d.\n", | |
1509 | __FILE__, __LINE__); | |
1510 | return -ENOTSUP; | |
50656eec MH |
1511 | break; |
1512 | } | |
1513 | } | |
1514 | ||
1515 | /* Exclusion check */ | |
146a1439 | 1516 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
1517 | semantic_error("Lazy pattern can't be used with" |
1518 | " line number.\n"); | |
146a1439 MH |
1519 | return -EINVAL; |
1520 | } | |
2a9c8c36 | 1521 | |
146a1439 | 1522 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 1523 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
1524 | return -EINVAL; |
1525 | } | |
2a9c8c36 | 1526 | |
146a1439 | 1527 | if (pp->line && pp->offset) { |
0e43e5d2 | 1528 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
1529 | return -EINVAL; |
1530 | } | |
50656eec | 1531 | |
146a1439 | 1532 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 1533 | semantic_error("File always requires line number or " |
0e43e5d2 | 1534 | "lazy pattern.\n"); |
146a1439 MH |
1535 | return -EINVAL; |
1536 | } | |
50656eec | 1537 | |
146a1439 | 1538 | if (pp->offset && !pp->function) { |
0e43e5d2 | 1539 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
1540 | return -EINVAL; |
1541 | } | |
50656eec | 1542 | |
146a1439 | 1543 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 1544 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 1545 | "return probe.\n"); |
146a1439 MH |
1546 | return -EINVAL; |
1547 | } | |
50656eec | 1548 | |
4235b045 | 1549 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
1550 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
1551 | pp->lazy_line); | |
146a1439 | 1552 | return 0; |
50656eec MH |
1553 | } |
1554 | ||
7df2f329 | 1555 | /* Parse perf-probe event argument */ |
146a1439 | 1556 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 1557 | { |
b2a3c12b | 1558 | char *tmp, *goodname; |
7df2f329 MH |
1559 | struct perf_probe_arg_field **fieldp; |
1560 | ||
1561 | pr_debug("parsing arg: %s into ", str); | |
1562 | ||
48481938 MH |
1563 | tmp = strchr(str, '='); |
1564 | if (tmp) { | |
02b95dad MH |
1565 | arg->name = strndup(str, tmp - str); |
1566 | if (arg->name == NULL) | |
1567 | return -ENOMEM; | |
11a1ca35 | 1568 | pr_debug("name:%s ", arg->name); |
48481938 MH |
1569 | str = tmp + 1; |
1570 | } | |
1571 | ||
11a1ca35 MH |
1572 | tmp = strchr(str, ':'); |
1573 | if (tmp) { /* Type setting */ | |
1574 | *tmp = '\0'; | |
02b95dad MH |
1575 | arg->type = strdup(tmp + 1); |
1576 | if (arg->type == NULL) | |
1577 | return -ENOMEM; | |
11a1ca35 MH |
1578 | pr_debug("type:%s ", arg->type); |
1579 | } | |
1580 | ||
b2a3c12b | 1581 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
1582 | if (!is_c_varname(str) || !tmp) { |
1583 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
1584 | arg->var = strdup(str); |
1585 | if (arg->var == NULL) | |
1586 | return -ENOMEM; | |
48481938 | 1587 | pr_debug("%s\n", arg->var); |
146a1439 | 1588 | return 0; |
7df2f329 MH |
1589 | } |
1590 | ||
b2a3c12b | 1591 | /* Structure fields or array element */ |
02b95dad MH |
1592 | arg->var = strndup(str, tmp - str); |
1593 | if (arg->var == NULL) | |
1594 | return -ENOMEM; | |
b2a3c12b | 1595 | goodname = arg->var; |
48481938 | 1596 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
1597 | fieldp = &arg->field; |
1598 | ||
1599 | do { | |
e334016f MH |
1600 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
1601 | if (*fieldp == NULL) | |
1602 | return -ENOMEM; | |
b2a3c12b MH |
1603 | if (*tmp == '[') { /* Array */ |
1604 | str = tmp; | |
1605 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 1606 | (*fieldp)->ref = true; |
b2a3c12b MH |
1607 | if (*tmp != ']' || tmp == str + 1) { |
1608 | semantic_error("Array index must be a" | |
1609 | " number.\n"); | |
1610 | return -EINVAL; | |
1611 | } | |
1612 | tmp++; | |
1613 | if (*tmp == '\0') | |
1614 | tmp = NULL; | |
1615 | } else { /* Structure */ | |
1616 | if (*tmp == '.') { | |
1617 | str = tmp + 1; | |
1618 | (*fieldp)->ref = false; | |
1619 | } else if (tmp[1] == '>') { | |
1620 | str = tmp + 2; | |
1621 | (*fieldp)->ref = true; | |
1622 | } else { | |
1623 | semantic_error("Argument parse error: %s\n", | |
1624 | str); | |
1625 | return -EINVAL; | |
1626 | } | |
1627 | tmp = strpbrk(str, "-.["); | |
146a1439 | 1628 | } |
7df2f329 | 1629 | if (tmp) { |
02b95dad MH |
1630 | (*fieldp)->name = strndup(str, tmp - str); |
1631 | if ((*fieldp)->name == NULL) | |
1632 | return -ENOMEM; | |
b2a3c12b MH |
1633 | if (*str != '[') |
1634 | goodname = (*fieldp)->name; | |
7df2f329 MH |
1635 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
1636 | fieldp = &(*fieldp)->next; | |
1637 | } | |
1638 | } while (tmp); | |
02b95dad MH |
1639 | (*fieldp)->name = strdup(str); |
1640 | if ((*fieldp)->name == NULL) | |
1641 | return -ENOMEM; | |
b2a3c12b MH |
1642 | if (*str != '[') |
1643 | goodname = (*fieldp)->name; | |
7df2f329 | 1644 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 1645 | |
b2a3c12b | 1646 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 1647 | if (!arg->name) { |
b2a3c12b | 1648 | arg->name = strdup(goodname); |
02b95dad MH |
1649 | if (arg->name == NULL) |
1650 | return -ENOMEM; | |
1651 | } | |
146a1439 | 1652 | return 0; |
7df2f329 MH |
1653 | } |
1654 | ||
4235b045 | 1655 | /* Parse perf-probe event command */ |
146a1439 | 1656 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 1657 | { |
e1c01d61 | 1658 | char **argv; |
146a1439 | 1659 | int argc, i, ret = 0; |
fac13fd5 | 1660 | |
4235b045 | 1661 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1662 | if (!argv) { |
1663 | pr_debug("Failed to split arguments.\n"); | |
1664 | return -ENOMEM; | |
1665 | } | |
1666 | if (argc - 1 > MAX_PROBE_ARGS) { | |
1667 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
1668 | ret = -ERANGE; | |
1669 | goto out; | |
1670 | } | |
50656eec | 1671 | /* Parse probe point */ |
146a1439 MH |
1672 | ret = parse_perf_probe_point(argv[0], pev); |
1673 | if (ret < 0) | |
1674 | goto out; | |
50656eec | 1675 | |
e1c01d61 | 1676 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 1677 | pev->nargs = argc - 1; |
e334016f MH |
1678 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1679 | if (pev->args == NULL) { | |
1680 | ret = -ENOMEM; | |
1681 | goto out; | |
1682 | } | |
146a1439 MH |
1683 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
1684 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
1685 | if (ret >= 0 && | |
1686 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 1687 | semantic_error("You can't specify local variable for" |
146a1439 MH |
1688 | " kretprobe.\n"); |
1689 | ret = -EINVAL; | |
1690 | } | |
e1c01d61 | 1691 | } |
146a1439 | 1692 | out: |
e1c01d61 | 1693 | argv_free(argv); |
146a1439 MH |
1694 | |
1695 | return ret; | |
50656eec MH |
1696 | } |
1697 | ||
b3f33f93 RB |
1698 | /* Returns true if *any* ARG is either C variable, $params or $vars. */ |
1699 | bool perf_probe_with_var(struct perf_probe_event *pev) | |
1700 | { | |
1701 | int i = 0; | |
1702 | ||
1703 | for (i = 0; i < pev->nargs; i++) | |
1704 | if (is_c_varname(pev->args[i].var) || | |
1705 | !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) || | |
1706 | !strcmp(pev->args[i].var, PROBE_ARG_VARS)) | |
1707 | return true; | |
1708 | return false; | |
1709 | } | |
1710 | ||
4235b045 MH |
1711 | /* Return true if this perf_probe_event requires debuginfo */ |
1712 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
1713 | { | |
4235b045 MH |
1714 | if (pev->point.file || pev->point.line || pev->point.lazy_line) |
1715 | return true; | |
1716 | ||
b3f33f93 RB |
1717 | if (perf_probe_with_var(pev)) |
1718 | return true; | |
4235b045 MH |
1719 | |
1720 | return false; | |
1721 | } | |
1722 | ||
0e60836b | 1723 | /* Parse probe_events event into struct probe_point */ |
92f6c72e | 1724 | int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) |
4de189fe | 1725 | { |
0e60836b | 1726 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
1727 | char pr; |
1728 | char *p; | |
bcbd0040 | 1729 | char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; |
4de189fe MH |
1730 | int ret, i, argc; |
1731 | char **argv; | |
1732 | ||
0e60836b | 1733 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1734 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1735 | if (!argv) { |
1736 | pr_debug("Failed to split arguments.\n"); | |
1737 | return -ENOMEM; | |
1738 | } | |
1739 | if (argc < 2) { | |
1740 | semantic_error("Too few probe arguments.\n"); | |
1741 | ret = -ERANGE; | |
1742 | goto out; | |
1743 | } | |
4de189fe MH |
1744 | |
1745 | /* Scan event and group name. */ | |
bcbd0040 IT |
1746 | argv0_str = strdup(argv[0]); |
1747 | if (argv0_str == NULL) { | |
1748 | ret = -ENOMEM; | |
1749 | goto out; | |
1750 | } | |
1751 | fmt1_str = strtok_r(argv0_str, ":", &fmt); | |
1752 | fmt2_str = strtok_r(NULL, "/", &fmt); | |
1753 | fmt3_str = strtok_r(NULL, " \t", &fmt); | |
1754 | if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL | |
1755 | || fmt3_str == NULL) { | |
146a1439 MH |
1756 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1757 | ret = -EINVAL; | |
1758 | goto out; | |
1759 | } | |
bcbd0040 IT |
1760 | pr = fmt1_str[0]; |
1761 | tev->group = strdup(fmt2_str); | |
1762 | tev->event = strdup(fmt3_str); | |
1763 | if (tev->group == NULL || tev->event == NULL) { | |
1764 | ret = -ENOMEM; | |
1765 | goto out; | |
1766 | } | |
4235b045 | 1767 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1768 | |
4235b045 | 1769 | tp->retprobe = (pr == 'r'); |
4de189fe | 1770 | |
190b57fc MH |
1771 | /* Scan module name(if there), function name and offset */ |
1772 | p = strchr(argv[1], ':'); | |
1773 | if (p) { | |
1774 | tp->module = strndup(argv[1], p - argv[1]); | |
844faa4b MH |
1775 | if (!tp->module) { |
1776 | ret = -ENOMEM; | |
1777 | goto out; | |
1778 | } | |
42bba263 | 1779 | tev->uprobes = (tp->module[0] == '/'); |
190b57fc MH |
1780 | p++; |
1781 | } else | |
1782 | p = argv[1]; | |
bcbd0040 | 1783 | fmt1_str = strtok_r(p, "+", &fmt); |
be07afe9 WN |
1784 | /* only the address started with 0x */ |
1785 | if (fmt1_str[0] == '0') { | |
1786 | /* | |
1787 | * Fix a special case: | |
1788 | * if address == 0, kernel reports something like: | |
1789 | * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax | |
1790 | * Newer kernel may fix that, but we want to | |
1791 | * support old kernel also. | |
1792 | */ | |
1793 | if (strcmp(fmt1_str, "0x") == 0) { | |
1794 | if (!argv[2] || strcmp(argv[2], "(null)")) { | |
1795 | ret = -EINVAL; | |
1796 | goto out; | |
1797 | } | |
1798 | tp->address = 0; | |
1799 | ||
1800 | free(argv[2]); | |
1801 | for (i = 2; argv[i + 1] != NULL; i++) | |
1802 | argv[i] = argv[i + 1]; | |
1803 | ||
1804 | argv[i] = NULL; | |
1805 | argc -= 1; | |
1806 | } else | |
1807 | tp->address = strtoul(fmt1_str, NULL, 0); | |
1808 | } else { | |
5a6f6314 MH |
1809 | /* Only the symbol-based probe has offset */ |
1810 | tp->symbol = strdup(fmt1_str); | |
1811 | if (tp->symbol == NULL) { | |
1812 | ret = -ENOMEM; | |
1813 | goto out; | |
1814 | } | |
1815 | fmt2_str = strtok_r(NULL, "", &fmt); | |
1816 | if (fmt2_str == NULL) | |
1817 | tp->offset = 0; | |
1818 | else | |
1819 | tp->offset = strtoul(fmt2_str, NULL, 10); | |
bcbd0040 | 1820 | } |
4de189fe | 1821 | |
5a5e3d3c RB |
1822 | if (tev->uprobes) { |
1823 | fmt2_str = strchr(p, '('); | |
1824 | if (fmt2_str) | |
1825 | tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0); | |
1826 | } | |
1827 | ||
4235b045 | 1828 | tev->nargs = argc - 2; |
0e60836b | 1829 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1830 | if (tev->args == NULL) { |
1831 | ret = -ENOMEM; | |
1832 | goto out; | |
1833 | } | |
4235b045 | 1834 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1835 | p = strchr(argv[i + 2], '='); |
1836 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1837 | *p++ = '\0'; |
1838 | else | |
1839 | p = argv[i + 2]; | |
02b95dad | 1840 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1841 | /* TODO: parse regs and offset */ |
02b95dad MH |
1842 | tev->args[i].value = strdup(p); |
1843 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1844 | ret = -ENOMEM; | |
1845 | goto out; | |
1846 | } | |
4de189fe | 1847 | } |
146a1439 MH |
1848 | ret = 0; |
1849 | out: | |
bcbd0040 | 1850 | free(argv0_str); |
4de189fe | 1851 | argv_free(argv); |
146a1439 | 1852 | return ret; |
4de189fe MH |
1853 | } |
1854 | ||
7df2f329 | 1855 | /* Compose only probe arg */ |
909b0360 | 1856 | char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) |
7df2f329 MH |
1857 | { |
1858 | struct perf_probe_arg_field *field = pa->field; | |
909b0360 | 1859 | struct strbuf buf; |
bf4d5f25 MH |
1860 | char *ret = NULL; |
1861 | int err; | |
1862 | ||
1863 | if (strbuf_init(&buf, 64) < 0) | |
1864 | return NULL; | |
7df2f329 | 1865 | |
48481938 | 1866 | if (pa->name && pa->var) |
bf4d5f25 | 1867 | err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); |
48481938 | 1868 | else |
bf4d5f25 MH |
1869 | err = strbuf_addstr(&buf, pa->name ?: pa->var); |
1870 | if (err) | |
1871 | goto out; | |
7df2f329 MH |
1872 | |
1873 | while (field) { | |
b2a3c12b | 1874 | if (field->name[0] == '[') |
bf4d5f25 | 1875 | err = strbuf_addstr(&buf, field->name); |
b2a3c12b | 1876 | else |
bf4d5f25 MH |
1877 | err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", |
1878 | field->name); | |
7df2f329 | 1879 | field = field->next; |
bf4d5f25 MH |
1880 | if (err) |
1881 | goto out; | |
7df2f329 | 1882 | } |
11a1ca35 | 1883 | |
909b0360 | 1884 | if (pa->type) |
bf4d5f25 MH |
1885 | if (strbuf_addf(&buf, ":%s", pa->type) < 0) |
1886 | goto out; | |
909b0360 MH |
1887 | |
1888 | ret = strbuf_detach(&buf, NULL); | |
bf4d5f25 MH |
1889 | out: |
1890 | strbuf_release(&buf); | |
146a1439 | 1891 | return ret; |
7df2f329 MH |
1892 | } |
1893 | ||
4235b045 | 1894 | /* Compose only probe point (not argument) */ |
c4ff4920 | 1895 | char *synthesize_perf_probe_point(struct perf_probe_point *pp) |
4de189fe | 1896 | { |
909b0360 | 1897 | struct strbuf buf; |
bf4d5f25 MH |
1898 | char *tmp, *ret = NULL; |
1899 | int len, err = 0; | |
1900 | ||
1901 | if (strbuf_init(&buf, 64) < 0) | |
1902 | return NULL; | |
909b0360 | 1903 | |
909b0360 | 1904 | if (pp->function) { |
bf4d5f25 MH |
1905 | if (strbuf_addstr(&buf, pp->function) < 0) |
1906 | goto out; | |
909b0360 | 1907 | if (pp->offset) |
bf4d5f25 | 1908 | err = strbuf_addf(&buf, "+%lu", pp->offset); |
909b0360 | 1909 | else if (pp->line) |
bf4d5f25 | 1910 | err = strbuf_addf(&buf, ":%d", pp->line); |
909b0360 | 1911 | else if (pp->retprobe) |
bf4d5f25 MH |
1912 | err = strbuf_addstr(&buf, "%return"); |
1913 | if (err) | |
1914 | goto out; | |
fb1587d8 MH |
1915 | } |
1916 | if (pp->file) { | |
32ae2ade FBH |
1917 | tmp = pp->file; |
1918 | len = strlen(tmp); | |
1919 | if (len > 30) { | |
1920 | tmp = strchr(pp->file + len - 30, '/'); | |
1921 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1922 | } | |
bf4d5f25 MH |
1923 | err = strbuf_addf(&buf, "@%s", tmp); |
1924 | if (!err && !pp->function && pp->line) | |
1925 | err = strbuf_addf(&buf, ":%d", pp->line); | |
4de189fe | 1926 | } |
bf4d5f25 MH |
1927 | if (!err) |
1928 | ret = strbuf_detach(&buf, NULL); | |
1929 | out: | |
1930 | strbuf_release(&buf); | |
1931 | return ret; | |
7ef17aaf MH |
1932 | } |
1933 | ||
4235b045 | 1934 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) |
7ef17aaf | 1935 | { |
c4ff4920 MH |
1936 | struct strbuf buf; |
1937 | char *tmp, *ret = NULL; | |
1938 | int i; | |
7ef17aaf | 1939 | |
c4ff4920 | 1940 | if (strbuf_init(&buf, 64)) |
4235b045 | 1941 | return NULL; |
c4ff4920 MH |
1942 | if (pev->event) |
1943 | if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, | |
1944 | pev->event) < 0) | |
1945 | goto out; | |
1946 | ||
1947 | tmp = synthesize_perf_probe_point(&pev->point); | |
1948 | if (!tmp || strbuf_addstr(&buf, tmp) < 0) | |
1949 | goto out; | |
1950 | free(tmp); | |
4de189fe | 1951 | |
4235b045 | 1952 | for (i = 0; i < pev->nargs; i++) { |
c4ff4920 MH |
1953 | tmp = synthesize_perf_probe_arg(pev->args + i); |
1954 | if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) | |
1955 | goto out; | |
1956 | free(tmp); | |
4de189fe | 1957 | } |
4de189fe | 1958 | |
c4ff4920 MH |
1959 | ret = strbuf_detach(&buf, NULL); |
1960 | out: | |
1961 | strbuf_release(&buf); | |
1962 | return ret; | |
4235b045 | 1963 | } |
4235b045 | 1964 | |
0e60836b | 1965 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
909b0360 | 1966 | struct strbuf *buf, int depth) |
4235b045 | 1967 | { |
bf4d5f25 | 1968 | int err; |
4235b045 | 1969 | if (ref->next) { |
0e60836b | 1970 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
909b0360 | 1971 | depth + 1); |
4235b045 | 1972 | if (depth < 0) |
bf4d5f25 | 1973 | return depth; |
4235b045 | 1974 | } |
bf4d5f25 MH |
1975 | err = strbuf_addf(buf, "%+ld(", ref->offset); |
1976 | return (err < 0) ? err : depth; | |
4de189fe MH |
1977 | } |
1978 | ||
0e60836b | 1979 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
909b0360 | 1980 | struct strbuf *buf) |
50656eec | 1981 | { |
0e60836b | 1982 | struct probe_trace_arg_ref *ref = arg->ref; |
bf4d5f25 | 1983 | int depth = 0, err; |
4235b045 MH |
1984 | |
1985 | /* Argument name or separator */ | |
1986 | if (arg->name) | |
bf4d5f25 | 1987 | err = strbuf_addf(buf, " %s=", arg->name); |
4235b045 | 1988 | else |
bf4d5f25 MH |
1989 | err = strbuf_addch(buf, ' '); |
1990 | if (err) | |
1991 | return err; | |
4235b045 | 1992 | |
b7dcb857 MH |
1993 | /* Special case: @XXX */ |
1994 | if (arg->value[0] == '@' && arg->ref) | |
1995 | ref = ref->next; | |
1996 | ||
4235b045 | 1997 | /* Dereferencing arguments */ |
b7dcb857 | 1998 | if (ref) { |
909b0360 | 1999 | depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); |
4235b045 MH |
2000 | if (depth < 0) |
2001 | return depth; | |
2002 | } | |
2003 | ||
2004 | /* Print argument value */ | |
b7dcb857 | 2005 | if (arg->value[0] == '@' && arg->ref) |
bf4d5f25 | 2006 | err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); |
b7dcb857 | 2007 | else |
bf4d5f25 | 2008 | err = strbuf_addstr(buf, arg->value); |
4235b045 MH |
2009 | |
2010 | /* Closing */ | |
bf4d5f25 MH |
2011 | while (!err && depth--) |
2012 | err = strbuf_addch(buf, ')'); | |
2013 | ||
4984912e | 2014 | /* Print argument type */ |
bf4d5f25 MH |
2015 | if (!err && arg->type) |
2016 | err = strbuf_addf(buf, ":%s", arg->type); | |
4235b045 | 2017 | |
bf4d5f25 | 2018 | return err; |
4235b045 MH |
2019 | } |
2020 | ||
5a5e3d3c RB |
2021 | static int |
2022 | synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf) | |
2023 | { | |
2024 | struct probe_trace_point *tp = &tev->point; | |
2025 | int err; | |
2026 | ||
2027 | err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address); | |
2028 | ||
2029 | if (err >= 0 && tp->ref_ctr_offset) { | |
2030 | if (!uprobe_ref_ctr_is_supported()) | |
2031 | return -1; | |
2032 | err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset); | |
2033 | } | |
2034 | return err >= 0 ? 0 : -1; | |
2035 | } | |
2036 | ||
0e60836b | 2037 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 2038 | { |
0e60836b | 2039 | struct probe_trace_point *tp = &tev->point; |
909b0360 MH |
2040 | struct strbuf buf; |
2041 | char *ret = NULL; | |
bf4d5f25 | 2042 | int i, err; |
eb948e50 | 2043 | |
da15bd9d WN |
2044 | /* Uprobes must have tp->module */ |
2045 | if (tev->uprobes && !tp->module) | |
909b0360 MH |
2046 | return NULL; |
2047 | ||
bf4d5f25 MH |
2048 | if (strbuf_init(&buf, 32) < 0) |
2049 | return NULL; | |
2050 | ||
2051 | if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', | |
2052 | tev->group, tev->event) < 0) | |
2053 | goto error; | |
da15bd9d WN |
2054 | /* |
2055 | * If tp->address == 0, then this point must be a | |
2056 | * absolute address uprobe. | |
2057 | * try_to_find_absolute_address() should have made | |
2058 | * tp->symbol to "0x0". | |
2059 | */ | |
2060 | if (tev->uprobes && !tp->address) { | |
2061 | if (!tp->symbol || strcmp(tp->symbol, "0x0")) | |
2062 | goto error; | |
2063 | } | |
eb948e50 MH |
2064 | |
2065 | /* Use the tp->address for uprobes */ | |
5a5e3d3c RB |
2066 | if (tev->uprobes) { |
2067 | err = synthesize_uprobe_trace_def(tev, &buf); | |
2068 | } else if (!strncmp(tp->symbol, "0x", 2)) { | |
da15bd9d | 2069 | /* Absolute address. See try_to_find_absolute_address() */ |
bf4d5f25 MH |
2070 | err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", |
2071 | tp->module ? ":" : "", tp->address); | |
5a5e3d3c | 2072 | } else { |
bf4d5f25 MH |
2073 | err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", |
2074 | tp->module ? ":" : "", tp->symbol, tp->offset); | |
5a5e3d3c RB |
2075 | } |
2076 | ||
bf4d5f25 MH |
2077 | if (err) |
2078 | goto error; | |
50656eec | 2079 | |
909b0360 MH |
2080 | for (i = 0; i < tev->nargs; i++) |
2081 | if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) | |
50656eec | 2082 | goto error; |
50656eec | 2083 | |
909b0360 | 2084 | ret = strbuf_detach(&buf, NULL); |
50656eec | 2085 | error: |
909b0360 MH |
2086 | strbuf_release(&buf); |
2087 | return ret; | |
4235b045 | 2088 | } |
50656eec | 2089 | |
5a6f6314 MH |
2090 | static int find_perf_probe_point_from_map(struct probe_trace_point *tp, |
2091 | struct perf_probe_point *pp, | |
2092 | bool is_kprobe) | |
2093 | { | |
2094 | struct symbol *sym = NULL; | |
8a2efd6d | 2095 | struct map *map = NULL; |
e486367f | 2096 | u64 addr = tp->address; |
5a6f6314 MH |
2097 | int ret = -ENOENT; |
2098 | ||
2099 | if (!is_kprobe) { | |
2100 | map = dso__new_map(tp->module); | |
2101 | if (!map) | |
2102 | goto out; | |
be39db9f | 2103 | sym = map__find_symbol(map, addr); |
5a6f6314 | 2104 | } else { |
9b239a12 | 2105 | if (tp->symbol && !addr) { |
0a62f686 MH |
2106 | if (kernel_get_symbol_address_by_name(tp->symbol, |
2107 | &addr, true, false) < 0) | |
9b239a12 MH |
2108 | goto out; |
2109 | } | |
5a6f6314 MH |
2110 | if (addr) { |
2111 | addr += tp->offset; | |
107cad95 | 2112 | sym = machine__find_kernel_symbol(host_machine, addr, &map); |
5a6f6314 MH |
2113 | } |
2114 | } | |
98d3b258 | 2115 | |
5a6f6314 MH |
2116 | if (!sym) |
2117 | goto out; | |
2118 | ||
2119 | pp->retprobe = tp->retprobe; | |
2120 | pp->offset = addr - map->unmap_ip(map, sym->start); | |
2121 | pp->function = strdup(sym->name); | |
2122 | ret = pp->function ? 0 : -ENOMEM; | |
2123 | ||
2124 | out: | |
2125 | if (map && !is_kprobe) { | |
84c2cafa | 2126 | map__put(map); |
5a6f6314 MH |
2127 | } |
2128 | ||
2129 | return ret; | |
2130 | } | |
2131 | ||
2132 | static int convert_to_perf_probe_point(struct probe_trace_point *tp, | |
da15bd9d WN |
2133 | struct perf_probe_point *pp, |
2134 | bool is_kprobe) | |
5a6f6314 MH |
2135 | { |
2136 | char buf[128]; | |
2137 | int ret; | |
2138 | ||
2139 | ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); | |
2140 | if (!ret) | |
2141 | return 0; | |
2142 | ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); | |
2143 | if (!ret) | |
2144 | return 0; | |
2145 | ||
2146 | pr_debug("Failed to find probe point from both of dwarf and map.\n"); | |
2147 | ||
2148 | if (tp->symbol) { | |
2149 | pp->function = strdup(tp->symbol); | |
2150 | pp->offset = tp->offset; | |
614e2fdb | 2151 | } else { |
5a6f6314 MH |
2152 | ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); |
2153 | if (ret < 0) | |
2154 | return ret; | |
2155 | pp->function = strdup(buf); | |
2156 | pp->offset = 0; | |
2157 | } | |
2158 | if (pp->function == NULL) | |
2159 | return -ENOMEM; | |
2160 | ||
2161 | pp->retprobe = tp->retprobe; | |
2162 | ||
2163 | return 0; | |
2164 | } | |
2165 | ||
0e60836b | 2166 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
225466f1 | 2167 | struct perf_probe_event *pev, bool is_kprobe) |
4235b045 | 2168 | { |
909b0360 | 2169 | struct strbuf buf = STRBUF_INIT; |
146a1439 | 2170 | int i, ret; |
4235b045 | 2171 | |
4b4da7f7 | 2172 | /* Convert event/group name */ |
02b95dad MH |
2173 | pev->event = strdup(tev->event); |
2174 | pev->group = strdup(tev->group); | |
2175 | if (pev->event == NULL || pev->group == NULL) | |
2176 | return -ENOMEM; | |
fb1587d8 | 2177 | |
4b4da7f7 | 2178 | /* Convert trace_point to probe_point */ |
5a6f6314 | 2179 | ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); |
146a1439 MH |
2180 | if (ret < 0) |
2181 | return ret; | |
4b4da7f7 | 2182 | |
4235b045 MH |
2183 | /* Convert trace_arg to probe_arg */ |
2184 | pev->nargs = tev->nargs; | |
e334016f MH |
2185 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
2186 | if (pev->args == NULL) | |
2187 | return -ENOMEM; | |
02b95dad | 2188 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 2189 | if (tev->args[i].name) |
02b95dad | 2190 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 2191 | else { |
bf4d5f25 MH |
2192 | if ((ret = strbuf_init(&buf, 32)) < 0) |
2193 | goto error; | |
909b0360 MH |
2194 | ret = synthesize_probe_trace_arg(&tev->args[i], &buf); |
2195 | pev->args[i].name = strbuf_detach(&buf, NULL); | |
4235b045 | 2196 | } |
02b95dad MH |
2197 | if (pev->args[i].name == NULL && ret >= 0) |
2198 | ret = -ENOMEM; | |
2199 | } | |
bf4d5f25 | 2200 | error: |
146a1439 MH |
2201 | if (ret < 0) |
2202 | clear_perf_probe_event(pev); | |
2203 | ||
2204 | return ret; | |
4235b045 MH |
2205 | } |
2206 | ||
2207 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
2208 | { | |
7df2f329 | 2209 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
2210 | int i; |
2211 | ||
f5385650 ACM |
2212 | free(pev->event); |
2213 | free(pev->group); | |
7afb3fab | 2214 | free(pev->target); |
9b118aca | 2215 | clear_perf_probe_point(&pev->point); |
f5385650 | 2216 | |
7df2f329 | 2217 | for (i = 0; i < pev->nargs; i++) { |
f5385650 ACM |
2218 | free(pev->args[i].name); |
2219 | free(pev->args[i].var); | |
2220 | free(pev->args[i].type); | |
7df2f329 MH |
2221 | field = pev->args[i].field; |
2222 | while (field) { | |
2223 | next = field->next; | |
74cf249d | 2224 | zfree(&field->name); |
7df2f329 MH |
2225 | free(field); |
2226 | field = next; | |
2227 | } | |
2228 | } | |
f5385650 | 2229 | free(pev->args); |
4235b045 MH |
2230 | memset(pev, 0, sizeof(*pev)); |
2231 | } | |
2232 | ||
0542bb9c MH |
2233 | #define strdup_or_goto(str, label) \ |
2234 | ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) | |
2235 | ||
2236 | static int perf_probe_point__copy(struct perf_probe_point *dst, | |
2237 | struct perf_probe_point *src) | |
2238 | { | |
2239 | dst->file = strdup_or_goto(src->file, out_err); | |
2240 | dst->function = strdup_or_goto(src->function, out_err); | |
2241 | dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); | |
2242 | dst->line = src->line; | |
2243 | dst->retprobe = src->retprobe; | |
2244 | dst->offset = src->offset; | |
2245 | return 0; | |
2246 | ||
2247 | out_err: | |
2248 | clear_perf_probe_point(dst); | |
2249 | return -ENOMEM; | |
2250 | } | |
2251 | ||
2252 | static int perf_probe_arg__copy(struct perf_probe_arg *dst, | |
2253 | struct perf_probe_arg *src) | |
2254 | { | |
2255 | struct perf_probe_arg_field *field, **ppfield; | |
2256 | ||
2257 | dst->name = strdup_or_goto(src->name, out_err); | |
2258 | dst->var = strdup_or_goto(src->var, out_err); | |
2259 | dst->type = strdup_or_goto(src->type, out_err); | |
2260 | ||
2261 | field = src->field; | |
2262 | ppfield = &(dst->field); | |
2263 | while (field) { | |
2264 | *ppfield = zalloc(sizeof(*field)); | |
2265 | if (!*ppfield) | |
2266 | goto out_err; | |
2267 | (*ppfield)->name = strdup_or_goto(field->name, out_err); | |
2268 | (*ppfield)->index = field->index; | |
2269 | (*ppfield)->ref = field->ref; | |
2270 | field = field->next; | |
2271 | ppfield = &((*ppfield)->next); | |
2272 | } | |
2273 | return 0; | |
2274 | out_err: | |
2275 | return -ENOMEM; | |
2276 | } | |
2277 | ||
2278 | int perf_probe_event__copy(struct perf_probe_event *dst, | |
2279 | struct perf_probe_event *src) | |
2280 | { | |
2281 | int i; | |
2282 | ||
2283 | dst->event = strdup_or_goto(src->event, out_err); | |
2284 | dst->group = strdup_or_goto(src->group, out_err); | |
2285 | dst->target = strdup_or_goto(src->target, out_err); | |
2286 | dst->uprobes = src->uprobes; | |
2287 | ||
2288 | if (perf_probe_point__copy(&dst->point, &src->point) < 0) | |
2289 | goto out_err; | |
2290 | ||
2291 | dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); | |
2292 | if (!dst->args) | |
2293 | goto out_err; | |
2294 | dst->nargs = src->nargs; | |
2295 | ||
2296 | for (i = 0; i < src->nargs; i++) | |
2297 | if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) | |
2298 | goto out_err; | |
2299 | return 0; | |
2300 | ||
2301 | out_err: | |
2302 | clear_perf_probe_event(dst); | |
2303 | return -ENOMEM; | |
2304 | } | |
2305 | ||
92f6c72e | 2306 | void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 2307 | { |
0e60836b | 2308 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
2309 | int i; |
2310 | ||
f5385650 ACM |
2311 | free(tev->event); |
2312 | free(tev->group); | |
2313 | free(tev->point.symbol); | |
4c859351 | 2314 | free(tev->point.realname); |
f5385650 | 2315 | free(tev->point.module); |
4235b045 | 2316 | for (i = 0; i < tev->nargs; i++) { |
f5385650 ACM |
2317 | free(tev->args[i].name); |
2318 | free(tev->args[i].value); | |
2319 | free(tev->args[i].type); | |
4235b045 MH |
2320 | ref = tev->args[i].ref; |
2321 | while (ref) { | |
2322 | next = ref->next; | |
2323 | free(ref); | |
2324 | ref = next; | |
2325 | } | |
2326 | } | |
f5385650 | 2327 | free(tev->args); |
4235b045 | 2328 | memset(tev, 0, sizeof(*tev)); |
50656eec MH |
2329 | } |
2330 | ||
9aaf5a5f MH |
2331 | struct kprobe_blacklist_node { |
2332 | struct list_head list; | |
2333 | unsigned long start; | |
2334 | unsigned long end; | |
2335 | char *symbol; | |
2336 | }; | |
2337 | ||
2338 | static void kprobe_blacklist__delete(struct list_head *blacklist) | |
2339 | { | |
2340 | struct kprobe_blacklist_node *node; | |
2341 | ||
2342 | while (!list_empty(blacklist)) { | |
2343 | node = list_first_entry(blacklist, | |
2344 | struct kprobe_blacklist_node, list); | |
2345 | list_del(&node->list); | |
2346 | free(node->symbol); | |
2347 | free(node); | |
2348 | } | |
2349 | } | |
2350 | ||
2351 | static int kprobe_blacklist__load(struct list_head *blacklist) | |
2352 | { | |
2353 | struct kprobe_blacklist_node *node; | |
4605eab3 | 2354 | const char *__debugfs = debugfs__mountpoint(); |
9aaf5a5f MH |
2355 | char buf[PATH_MAX], *p; |
2356 | FILE *fp; | |
2357 | int ret; | |
2358 | ||
2359 | if (__debugfs == NULL) | |
2360 | return -ENOTSUP; | |
2361 | ||
2362 | ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); | |
2363 | if (ret < 0) | |
2364 | return ret; | |
2365 | ||
2366 | fp = fopen(buf, "r"); | |
2367 | if (!fp) | |
2368 | return -errno; | |
2369 | ||
2370 | ret = 0; | |
2371 | while (fgets(buf, PATH_MAX, fp)) { | |
2372 | node = zalloc(sizeof(*node)); | |
2373 | if (!node) { | |
2374 | ret = -ENOMEM; | |
2375 | break; | |
2376 | } | |
2377 | INIT_LIST_HEAD(&node->list); | |
2378 | list_add_tail(&node->list, blacklist); | |
2379 | if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { | |
2380 | ret = -EINVAL; | |
2381 | break; | |
2382 | } | |
2383 | p = strchr(buf, '\t'); | |
2384 | if (p) { | |
2385 | p++; | |
2386 | if (p[strlen(p) - 1] == '\n') | |
2387 | p[strlen(p) - 1] = '\0'; | |
2388 | } else | |
2389 | p = (char *)"unknown"; | |
2390 | node->symbol = strdup(p); | |
2391 | if (!node->symbol) { | |
2392 | ret = -ENOMEM; | |
2393 | break; | |
2394 | } | |
2395 | pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", | |
2396 | node->start, node->end, node->symbol); | |
2397 | ret++; | |
2398 | } | |
2399 | if (ret < 0) | |
2400 | kprobe_blacklist__delete(blacklist); | |
2401 | fclose(fp); | |
2402 | ||
2403 | return ret; | |
2404 | } | |
2405 | ||
2406 | static struct kprobe_blacklist_node * | |
2407 | kprobe_blacklist__find_by_address(struct list_head *blacklist, | |
2408 | unsigned long address) | |
2409 | { | |
2410 | struct kprobe_blacklist_node *node; | |
2411 | ||
2412 | list_for_each_entry(node, blacklist, list) { | |
2c29461e | 2413 | if (node->start <= address && address < node->end) |
9aaf5a5f MH |
2414 | return node; |
2415 | } | |
2416 | ||
2417 | return NULL; | |
2418 | } | |
2419 | ||
b031220d MH |
2420 | static LIST_HEAD(kprobe_blacklist); |
2421 | ||
2422 | static void kprobe_blacklist__init(void) | |
2423 | { | |
2424 | if (!list_empty(&kprobe_blacklist)) | |
2425 | return; | |
2426 | ||
2427 | if (kprobe_blacklist__load(&kprobe_blacklist) < 0) | |
2428 | pr_debug("No kprobe blacklist support, ignored\n"); | |
2429 | } | |
2430 | ||
2431 | static void kprobe_blacklist__release(void) | |
2432 | { | |
2433 | kprobe_blacklist__delete(&kprobe_blacklist); | |
2434 | } | |
2435 | ||
2436 | static bool kprobe_blacklist__listed(unsigned long address) | |
2437 | { | |
2438 | return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); | |
2439 | } | |
2440 | ||
d350bd57 MH |
2441 | static int perf_probe_event__sprintf(const char *group, const char *event, |
2442 | struct perf_probe_event *pev, | |
ba7ecb02 MH |
2443 | const char *module, |
2444 | struct strbuf *result) | |
278498d4 | 2445 | { |
bf4d5f25 | 2446 | int i, ret; |
909b0360 | 2447 | char *buf; |
278498d4 | 2448 | |
909b0360 MH |
2449 | if (asprintf(&buf, "%s:%s", group, event) < 0) |
2450 | return -errno; | |
bf4d5f25 | 2451 | ret = strbuf_addf(result, " %-20s (on ", buf); |
909b0360 | 2452 | free(buf); |
bf4d5f25 MH |
2453 | if (ret) |
2454 | return ret; | |
4235b045 | 2455 | |
909b0360 MH |
2456 | /* Synthesize only event probe point */ |
2457 | buf = synthesize_perf_probe_point(&pev->point); | |
2458 | if (!buf) | |
2459 | return -ENOMEM; | |
bf4d5f25 | 2460 | ret = strbuf_addstr(result, buf); |
909b0360 | 2461 | free(buf); |
146a1439 | 2462 | |
bf4d5f25 MH |
2463 | if (!ret && module) |
2464 | ret = strbuf_addf(result, " in %s", module); | |
278498d4 | 2465 | |
bf4d5f25 MH |
2466 | if (!ret && pev->nargs > 0) { |
2467 | ret = strbuf_add(result, " with", 5); | |
2468 | for (i = 0; !ret && i < pev->nargs; i++) { | |
909b0360 MH |
2469 | buf = synthesize_perf_probe_arg(&pev->args[i]); |
2470 | if (!buf) | |
2471 | return -ENOMEM; | |
bf4d5f25 | 2472 | ret = strbuf_addf(result, " %s", buf); |
909b0360 | 2473 | free(buf); |
7df2f329 | 2474 | } |
278498d4 | 2475 | } |
bf4d5f25 MH |
2476 | if (!ret) |
2477 | ret = strbuf_addch(result, ')'); | |
909b0360 | 2478 | |
bf4d5f25 | 2479 | return ret; |
278498d4 MH |
2480 | } |
2481 | ||
ba7ecb02 | 2482 | /* Show an event */ |
b02137cc NK |
2483 | int show_perf_probe_event(const char *group, const char *event, |
2484 | struct perf_probe_event *pev, | |
2485 | const char *module, bool use_stdout) | |
ba7ecb02 MH |
2486 | { |
2487 | struct strbuf buf = STRBUF_INIT; | |
2488 | int ret; | |
2489 | ||
d350bd57 | 2490 | ret = perf_probe_event__sprintf(group, event, pev, module, &buf); |
ba7ecb02 MH |
2491 | if (ret >= 0) { |
2492 | if (use_stdout) | |
2493 | printf("%s\n", buf.buf); | |
2494 | else | |
2495 | pr_info("%s\n", buf.buf); | |
2496 | } | |
2497 | strbuf_release(&buf); | |
2498 | ||
2499 | return ret; | |
2500 | } | |
2501 | ||
b6a89643 MH |
2502 | static bool filter_probe_trace_event(struct probe_trace_event *tev, |
2503 | struct strfilter *filter) | |
2504 | { | |
2505 | char tmp[128]; | |
2506 | ||
2507 | /* At first, check the event name itself */ | |
2508 | if (strfilter__compare(filter, tev->event)) | |
2509 | return true; | |
2510 | ||
2511 | /* Next, check the combination of name and group */ | |
2512 | if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) | |
2513 | return false; | |
2514 | return strfilter__compare(filter, tmp); | |
2515 | } | |
2516 | ||
2517 | static int __show_perf_probe_events(int fd, bool is_kprobe, | |
2518 | struct strfilter *filter) | |
4de189fe | 2519 | { |
225466f1 | 2520 | int ret = 0; |
0e60836b | 2521 | struct probe_trace_event tev; |
4235b045 | 2522 | struct perf_probe_event pev; |
4de189fe MH |
2523 | struct strlist *rawlist; |
2524 | struct str_node *ent; | |
2525 | ||
4235b045 MH |
2526 | memset(&tev, 0, sizeof(tev)); |
2527 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 2528 | |
92f6c72e | 2529 | rawlist = probe_file__get_rawlist(fd); |
146a1439 | 2530 | if (!rawlist) |
6eb08660 | 2531 | return -ENOMEM; |
4de189fe | 2532 | |
602a1f4d | 2533 | strlist__for_each_entry(ent, rawlist) { |
0e60836b | 2534 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 | 2535 | if (ret >= 0) { |
b6a89643 MH |
2536 | if (!filter_probe_trace_event(&tev, filter)) |
2537 | goto next; | |
225466f1 SD |
2538 | ret = convert_to_perf_probe_event(&tev, &pev, |
2539 | is_kprobe); | |
ba7ecb02 MH |
2540 | if (ret < 0) |
2541 | goto next; | |
d350bd57 MH |
2542 | ret = show_perf_probe_event(pev.group, pev.event, |
2543 | &pev, tev.point.module, | |
ba7ecb02 | 2544 | true); |
146a1439 | 2545 | } |
b6a89643 | 2546 | next: |
4235b045 | 2547 | clear_perf_probe_event(&pev); |
0e60836b | 2548 | clear_probe_trace_event(&tev); |
146a1439 MH |
2549 | if (ret < 0) |
2550 | break; | |
4de189fe | 2551 | } |
4de189fe | 2552 | strlist__delete(rawlist); |
7737af01 MH |
2553 | /* Cleanup cached debuginfo if needed */ |
2554 | debuginfo_cache__exit(); | |
146a1439 MH |
2555 | |
2556 | return ret; | |
4de189fe MH |
2557 | } |
2558 | ||
225466f1 | 2559 | /* List up current perf-probe events */ |
b6a89643 | 2560 | int show_perf_probe_events(struct strfilter *filter) |
225466f1 | 2561 | { |
5e45187c | 2562 | int kp_fd, up_fd, ret; |
225466f1 SD |
2563 | |
2564 | setup_pager(); | |
225466f1 | 2565 | |
1f3736c9 MH |
2566 | if (probe_conf.cache) |
2567 | return probe_cache__show_all_caches(filter); | |
2568 | ||
9bae1e8c | 2569 | ret = init_probe_symbol_maps(false); |
225466f1 SD |
2570 | if (ret < 0) |
2571 | return ret; | |
2572 | ||
92f6c72e MH |
2573 | ret = probe_file__open_both(&kp_fd, &up_fd, 0); |
2574 | if (ret < 0) | |
2575 | return ret; | |
225466f1 | 2576 | |
92f6c72e MH |
2577 | if (kp_fd >= 0) |
2578 | ret = __show_perf_probe_events(kp_fd, true, filter); | |
2579 | if (up_fd >= 0 && ret >= 0) | |
b6a89643 | 2580 | ret = __show_perf_probe_events(up_fd, false, filter); |
92f6c72e MH |
2581 | if (kp_fd > 0) |
2582 | close(kp_fd); | |
2583 | if (up_fd > 0) | |
5e45187c | 2584 | close(up_fd); |
9bae1e8c | 2585 | exit_probe_symbol_maps(); |
225466f1 | 2586 | |
146a1439 | 2587 | return ret; |
50656eec MH |
2588 | } |
2589 | ||
146a1439 | 2590 | static int get_new_event_name(char *buf, size_t len, const char *base, |
e63c625a MH |
2591 | struct strlist *namelist, bool ret_event, |
2592 | bool allow_suffix) | |
b498ce1f MH |
2593 | { |
2594 | int i, ret; | |
663b1151 | 2595 | char *p, *nbase; |
17f88fcd | 2596 | |
3099c026 NR |
2597 | if (*base == '.') |
2598 | base++; | |
663b1151 MH |
2599 | nbase = strdup(base); |
2600 | if (!nbase) | |
2601 | return -ENOMEM; | |
2602 | ||
a3110cd9 MH |
2603 | /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */ |
2604 | p = strpbrk(nbase, ".@"); | |
663b1151 MH |
2605 | if (p && p != nbase) |
2606 | *p = '\0'; | |
3099c026 | 2607 | |
663b1151 | 2608 | /* Try no suffix number */ |
e63c625a | 2609 | ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : ""); |
146a1439 | 2610 | if (ret < 0) { |
5f03cba4 | 2611 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2612 | goto out; |
146a1439 | 2613 | } |
17f88fcd | 2614 | if (!strlist__has_entry(namelist, buf)) |
663b1151 | 2615 | goto out; |
17f88fcd | 2616 | |
d761b08b | 2617 | if (!allow_suffix) { |
03e01f56 WN |
2618 | pr_warning("Error: event \"%s\" already exists.\n" |
2619 | " Hint: Remove existing event by 'perf probe -d'\n" | |
2620 | " or force duplicates by 'perf probe -f'\n" | |
2621 | " or set 'force=yes' in BPF source.\n", | |
2622 | buf); | |
663b1151 MH |
2623 | ret = -EEXIST; |
2624 | goto out; | |
d761b08b MH |
2625 | } |
2626 | ||
17f88fcd MH |
2627 | /* Try to add suffix */ |
2628 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
663b1151 | 2629 | ret = e_snprintf(buf, len, "%s_%d", nbase, i); |
146a1439 | 2630 | if (ret < 0) { |
5f03cba4 | 2631 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2632 | goto out; |
146a1439 | 2633 | } |
b498ce1f MH |
2634 | if (!strlist__has_entry(namelist, buf)) |
2635 | break; | |
2636 | } | |
146a1439 MH |
2637 | if (i == MAX_EVENT_INDEX) { |
2638 | pr_warning("Too many events are on the same function.\n"); | |
2639 | ret = -ERANGE; | |
2640 | } | |
2641 | ||
663b1151 MH |
2642 | out: |
2643 | free(nbase); | |
9f5c6d87 MH |
2644 | |
2645 | /* Final validation */ | |
2646 | if (ret >= 0 && !is_c_func_name(buf)) { | |
2647 | pr_warning("Internal error: \"%s\" is an invalid event name.\n", | |
2648 | buf); | |
2649 | ret = -EINVAL; | |
2650 | } | |
2651 | ||
146a1439 | 2652 | return ret; |
b498ce1f MH |
2653 | } |
2654 | ||
79702f61 MH |
2655 | /* Warn if the current kernel's uprobe implementation is old */ |
2656 | static void warn_uprobe_event_compat(struct probe_trace_event *tev) | |
2657 | { | |
2658 | int i; | |
2659 | char *buf = synthesize_probe_trace_command(tev); | |
5a5e3d3c RB |
2660 | struct probe_trace_point *tp = &tev->point; |
2661 | ||
2662 | if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) { | |
2663 | pr_warning("A semaphore is associated with %s:%s and " | |
2664 | "seems your kernel doesn't support it.\n", | |
2665 | tev->group, tev->event); | |
2666 | } | |
79702f61 MH |
2667 | |
2668 | /* Old uprobe event doesn't support memory dereference */ | |
2669 | if (!tev->uprobes || tev->nargs == 0 || !buf) | |
2670 | goto out; | |
2671 | ||
2672 | for (i = 0; i < tev->nargs; i++) | |
2673 | if (strglobmatch(tev->args[i].value, "[$@+-]*")) { | |
2674 | pr_warning("Please upgrade your kernel to at least " | |
2675 | "3.14 to have access to feature %s\n", | |
2676 | tev->args[i].value); | |
2677 | break; | |
2678 | } | |
2679 | out: | |
2680 | free(buf); | |
2681 | } | |
2682 | ||
a3c9de62 MH |
2683 | /* Set new name from original perf_probe_event and namelist */ |
2684 | static int probe_trace_event__set_name(struct probe_trace_event *tev, | |
2685 | struct perf_probe_event *pev, | |
2686 | struct strlist *namelist, | |
2687 | bool allow_suffix) | |
2688 | { | |
2689 | const char *event, *group; | |
2690 | char buf[64]; | |
2691 | int ret; | |
2692 | ||
bc062230 | 2693 | /* If probe_event or trace_event already have the name, reuse it */ |
42bba263 | 2694 | if (pev->event && !pev->sdt) |
a3c9de62 | 2695 | event = pev->event; |
bc062230 MH |
2696 | else if (tev->event) |
2697 | event = tev->event; | |
2698 | else { | |
2699 | /* Or generate new one from probe point */ | |
da15bd9d WN |
2700 | if (pev->point.function && |
2701 | (strncmp(pev->point.function, "0x", 2) != 0) && | |
2702 | !strisglob(pev->point.function)) | |
a3c9de62 MH |
2703 | event = pev->point.function; |
2704 | else | |
2705 | event = tev->point.realname; | |
bc062230 | 2706 | } |
42bba263 | 2707 | if (pev->group && !pev->sdt) |
a3c9de62 | 2708 | group = pev->group; |
bc062230 MH |
2709 | else if (tev->group) |
2710 | group = tev->group; | |
a3c9de62 MH |
2711 | else |
2712 | group = PERFPROBE_GROUP; | |
2713 | ||
2714 | /* Get an unused new event name */ | |
e63c625a MH |
2715 | ret = get_new_event_name(buf, 64, event, namelist, |
2716 | tev->point.retprobe, allow_suffix); | |
a3c9de62 MH |
2717 | if (ret < 0) |
2718 | return ret; | |
2719 | ||
2720 | event = buf; | |
2721 | ||
2722 | tev->event = strdup(event); | |
2723 | tev->group = strdup(group); | |
2724 | if (tev->event == NULL || tev->group == NULL) | |
2725 | return -ENOMEM; | |
2726 | ||
2727 | /* Add added event name to namelist */ | |
2728 | strlist__add(namelist, event); | |
2729 | return 0; | |
2730 | } | |
2731 | ||
1de7b8bf MH |
2732 | static int __open_probe_file_and_namelist(bool uprobe, |
2733 | struct strlist **namelist) | |
50656eec | 2734 | { |
1de7b8bf | 2735 | int fd; |
50656eec | 2736 | |
1de7b8bf | 2737 | fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); |
92f6c72e | 2738 | if (fd < 0) |
146a1439 | 2739 | return fd; |
5e45187c | 2740 | |
b498ce1f | 2741 | /* Get current event names */ |
1de7b8bf MH |
2742 | *namelist = probe_file__get_namelist(fd); |
2743 | if (!(*namelist)) { | |
146a1439 | 2744 | pr_debug("Failed to get current event list.\n"); |
1de7b8bf MH |
2745 | close(fd); |
2746 | return -ENOMEM; | |
146a1439 | 2747 | } |
1de7b8bf MH |
2748 | return fd; |
2749 | } | |
2750 | ||
2751 | static int __add_probe_trace_events(struct perf_probe_event *pev, | |
2752 | struct probe_trace_event *tevs, | |
2753 | int ntevs, bool allow_suffix) | |
2754 | { | |
2755 | int i, fd[2] = {-1, -1}, up, ret; | |
2756 | struct probe_trace_event *tev = NULL; | |
2757 | struct probe_cache *cache = NULL; | |
2758 | struct strlist *namelist[2] = {NULL, NULL}; | |
544abd44 | 2759 | struct nscookie nsc; |
1de7b8bf MH |
2760 | |
2761 | up = pev->uprobes ? 1 : 0; | |
2762 | fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); | |
2763 | if (fd[up] < 0) | |
2764 | return fd[up]; | |
4235b045 | 2765 | |
146a1439 | 2766 | ret = 0; |
02b95dad | 2767 | for (i = 0; i < ntevs; i++) { |
4235b045 | 2768 | tev = &tevs[i]; |
1de7b8bf MH |
2769 | up = tev->uprobes ? 1 : 0; |
2770 | if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ | |
2771 | fd[up] = __open_probe_file_and_namelist(up, | |
2772 | &namelist[up]); | |
2773 | if (fd[up] < 0) | |
2774 | goto close_out; | |
2775 | } | |
b031220d | 2776 | /* Skip if the symbol is out of .text or blacklisted */ |
bc062230 | 2777 | if (!tev->point.symbol && !pev->uprobes) |
5a51fcd1 | 2778 | continue; |
9aaf5a5f | 2779 | |
a3c9de62 | 2780 | /* Set new name for tev (and update namelist) */ |
1de7b8bf | 2781 | ret = probe_trace_event__set_name(tev, pev, namelist[up], |
a3c9de62 | 2782 | allow_suffix); |
146a1439 MH |
2783 | if (ret < 0) |
2784 | break; | |
4235b045 | 2785 | |
544abd44 | 2786 | nsinfo__mountns_enter(pev->nsi, &nsc); |
1de7b8bf | 2787 | ret = probe_file__add_event(fd[up], tev); |
544abd44 | 2788 | nsinfo__mountns_exit(&nsc); |
146a1439 MH |
2789 | if (ret < 0) |
2790 | break; | |
4235b045 | 2791 | |
4235b045 MH |
2792 | /* |
2793 | * Probes after the first probe which comes from same | |
2794 | * user input are always allowed to add suffix, because | |
2795 | * there might be several addresses corresponding to | |
2796 | * one code line. | |
2797 | */ | |
2798 | allow_suffix = true; | |
50656eec | 2799 | } |
79702f61 MH |
2800 | if (ret == -EINVAL && pev->uprobes) |
2801 | warn_uprobe_event_compat(tev); | |
2fd457a3 | 2802 | if (ret == 0 && probe_conf.cache) { |
f045b8c4 | 2803 | cache = probe_cache__new(pev->target, pev->nsi); |
2fd457a3 MH |
2804 | if (!cache || |
2805 | probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || | |
2806 | probe_cache__commit(cache) < 0) | |
2807 | pr_warning("Failed to add event to probe cache\n"); | |
2808 | probe_cache__delete(cache); | |
2809 | } | |
146a1439 | 2810 | |
ae2cb1ac | 2811 | close_out: |
1de7b8bf MH |
2812 | for (up = 0; up < 2; up++) { |
2813 | strlist__delete(namelist[up]); | |
2814 | if (fd[up] >= 0) | |
2815 | close(fd[up]); | |
2816 | } | |
146a1439 | 2817 | return ret; |
50656eec | 2818 | } |
fa28244d | 2819 | |
6bb536cc WN |
2820 | static int find_probe_functions(struct map *map, char *name, |
2821 | struct symbol **syms) | |
eb948e50 | 2822 | { |
564c62a4 | 2823 | int found = 0; |
0a3873a8 | 2824 | struct symbol *sym; |
4c859351 | 2825 | struct rb_node *tmp; |
4b3a2716 MH |
2826 | const char *norm, *ver; |
2827 | char *buf = NULL; | |
c588d158 | 2828 | bool cut_version = true; |
564c62a4 | 2829 | |
be39db9f | 2830 | if (map__load(map) < 0) |
75e4a2a6 WN |
2831 | return 0; |
2832 | ||
c588d158 MH |
2833 | /* If user gives a version, don't cut off the version from symbols */ |
2834 | if (strchr(name, '@')) | |
2835 | cut_version = false; | |
2836 | ||
4c859351 | 2837 | map__for_each_symbol(map, sym, tmp) { |
4b3a2716 MH |
2838 | norm = arch__normalize_symbol_name(sym->name); |
2839 | if (!norm) | |
2840 | continue; | |
2841 | ||
c588d158 MH |
2842 | if (cut_version) { |
2843 | /* We don't care about default symbol or not */ | |
2844 | ver = strchr(norm, '@'); | |
2845 | if (ver) { | |
2846 | buf = strndup(norm, ver - norm); | |
2847 | if (!buf) | |
2848 | return -ENOMEM; | |
2849 | norm = buf; | |
2850 | } | |
4b3a2716 | 2851 | } |
c588d158 | 2852 | |
4b3a2716 | 2853 | if (strglobmatch(norm, name)) { |
4c859351 | 2854 | found++; |
6bb536cc WN |
2855 | if (syms && found < probe_conf.max_probes) |
2856 | syms[found - 1] = sym; | |
2857 | } | |
4b3a2716 MH |
2858 | if (buf) |
2859 | zfree(&buf); | |
eb948e50 | 2860 | } |
564c62a4 NK |
2861 | |
2862 | return found; | |
eb948e50 MH |
2863 | } |
2864 | ||
7b6ff0bd NR |
2865 | void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, |
2866 | struct probe_trace_event *tev __maybe_unused, | |
0b3c2264 NR |
2867 | struct map *map __maybe_unused, |
2868 | struct symbol *sym __maybe_unused) { } | |
7b6ff0bd | 2869 | |
eb948e50 MH |
2870 | /* |
2871 | * Find probe function addresses from map. | |
2872 | * Return an error or the number of found probe_trace_event | |
2873 | */ | |
2874 | static int find_probe_trace_events_from_map(struct perf_probe_event *pev, | |
ddb2f58f | 2875 | struct probe_trace_event **tevs) |
e0faa8d3 | 2876 | { |
eb948e50 | 2877 | struct map *map = NULL; |
eb948e50 | 2878 | struct ref_reloc_sym *reloc_sym = NULL; |
e0faa8d3 | 2879 | struct symbol *sym; |
6bb536cc | 2880 | struct symbol **syms = NULL; |
0e60836b | 2881 | struct probe_trace_event *tev; |
eb948e50 MH |
2882 | struct perf_probe_point *pp = &pev->point; |
2883 | struct probe_trace_point *tp; | |
564c62a4 | 2884 | int num_matched_functions; |
b031220d | 2885 | int ret, i, j, skipped = 0; |
c61fb959 | 2886 | char *mod_name; |
4235b045 | 2887 | |
544abd44 | 2888 | map = get_target_map(pev->target, pev->nsi, pev->uprobes); |
eb948e50 MH |
2889 | if (!map) { |
2890 | ret = -EINVAL; | |
2891 | goto out; | |
fb7345bb MH |
2892 | } |
2893 | ||
6bb536cc WN |
2894 | syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); |
2895 | if (!syms) { | |
2896 | ret = -ENOMEM; | |
2897 | goto out; | |
2898 | } | |
2899 | ||
eb948e50 MH |
2900 | /* |
2901 | * Load matched symbols: Since the different local symbols may have | |
2902 | * same name but different addresses, this lists all the symbols. | |
2903 | */ | |
6bb536cc | 2904 | num_matched_functions = find_probe_functions(map, pp->function, syms); |
4b3a2716 | 2905 | if (num_matched_functions <= 0) { |
eb948e50 | 2906 | pr_err("Failed to find symbol %s in %s\n", pp->function, |
44225521 | 2907 | pev->target ? : "kernel"); |
eb948e50 MH |
2908 | ret = -ENOENT; |
2909 | goto out; | |
ddb2f58f | 2910 | } else if (num_matched_functions > probe_conf.max_probes) { |
eb948e50 | 2911 | pr_err("Too many functions matched in %s\n", |
44225521 | 2912 | pev->target ? : "kernel"); |
eb948e50 MH |
2913 | ret = -E2BIG; |
2914 | goto out; | |
fb7345bb MH |
2915 | } |
2916 | ||
1a8ac29c | 2917 | /* Note that the symbols in the kmodule are not relocated */ |
7ab31d94 NR |
2918 | if (!pev->uprobes && !pev->target && |
2919 | (!pp->retprobe || kretprobe_offset_is_supported())) { | |
0560a0c4 | 2920 | reloc_sym = kernel_get_ref_reloc_sym(); |
eb948e50 MH |
2921 | if (!reloc_sym) { |
2922 | pr_warning("Relocated base symbol is not found!\n"); | |
2923 | ret = -EINVAL; | |
2924 | goto out; | |
2925 | } | |
2926 | } | |
4235b045 | 2927 | |
eb948e50 MH |
2928 | /* Setup result trace-probe-events */ |
2929 | *tevs = zalloc(sizeof(*tev) * num_matched_functions); | |
2930 | if (!*tevs) { | |
02b95dad | 2931 | ret = -ENOMEM; |
eb948e50 | 2932 | goto out; |
02b95dad | 2933 | } |
ce27a443 | 2934 | |
eb948e50 | 2935 | ret = 0; |
564c62a4 | 2936 | |
6bb536cc WN |
2937 | for (j = 0; j < num_matched_functions; j++) { |
2938 | sym = syms[j]; | |
2939 | ||
eb948e50 MH |
2940 | tev = (*tevs) + ret; |
2941 | tp = &tev->point; | |
2942 | if (ret == num_matched_functions) { | |
2943 | pr_warning("Too many symbols are listed. Skip it.\n"); | |
2944 | break; | |
ce27a443 | 2945 | } |
eb948e50 | 2946 | ret++; |
ce27a443 | 2947 | |
eb948e50 MH |
2948 | if (pp->offset > sym->end - sym->start) { |
2949 | pr_warning("Offset %ld is bigger than the size of %s\n", | |
2950 | pp->offset, sym->name); | |
2951 | ret = -ENOENT; | |
2952 | goto err_out; | |
2953 | } | |
2954 | /* Add one probe point */ | |
2955 | tp->address = map->unmap_ip(map, sym->start) + pp->offset; | |
1a8ac29c MH |
2956 | |
2957 | /* Check the kprobe (not in module) is within .text */ | |
2958 | if (!pev->uprobes && !pev->target && | |
b031220d MH |
2959 | kprobe_warn_out_range(sym->name, tp->address)) { |
2960 | tp->symbol = NULL; /* Skip it */ | |
2961 | skipped++; | |
2962 | } else if (reloc_sym) { | |
eb948e50 MH |
2963 | tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); |
2964 | tp->offset = tp->address - reloc_sym->addr; | |
2965 | } else { | |
2966 | tp->symbol = strdup_or_goto(sym->name, nomem_out); | |
2967 | tp->offset = pp->offset; | |
2968 | } | |
6bb536cc WN |
2969 | tp->realname = strdup_or_goto(sym->name, nomem_out); |
2970 | ||
eb948e50 | 2971 | tp->retprobe = pp->retprobe; |
c61fb959 RB |
2972 | if (pev->target) { |
2973 | if (pev->uprobes) { | |
2974 | tev->point.module = strdup_or_goto(pev->target, | |
2975 | nomem_out); | |
2976 | } else { | |
2977 | mod_name = find_module_name(pev->target); | |
2978 | tev->point.module = | |
2979 | strdup(mod_name ? mod_name : pev->target); | |
2980 | free(mod_name); | |
2981 | if (!tev->point.module) | |
2982 | goto nomem_out; | |
2983 | } | |
2984 | } | |
eb948e50 MH |
2985 | tev->uprobes = pev->uprobes; |
2986 | tev->nargs = pev->nargs; | |
2987 | if (tev->nargs) { | |
2988 | tev->args = zalloc(sizeof(struct probe_trace_arg) * | |
2989 | tev->nargs); | |
2990 | if (tev->args == NULL) | |
2991 | goto nomem_out; | |
e334016f | 2992 | } |
48481938 | 2993 | for (i = 0; i < tev->nargs; i++) { |
eb948e50 MH |
2994 | if (pev->args[i].name) |
2995 | tev->args[i].name = | |
2996 | strdup_or_goto(pev->args[i].name, | |
2997 | nomem_out); | |
2998 | ||
2999 | tev->args[i].value = strdup_or_goto(pev->args[i].var, | |
3000 | nomem_out); | |
3001 | if (pev->args[i].type) | |
3002 | tev->args[i].type = | |
3003 | strdup_or_goto(pev->args[i].type, | |
3004 | nomem_out); | |
48481938 | 3005 | } |
0b3c2264 | 3006 | arch__fix_tev_from_maps(pev, tev, map, sym); |
4235b045 | 3007 | } |
b031220d MH |
3008 | if (ret == skipped) { |
3009 | ret = -ENOENT; | |
3010 | goto err_out; | |
3011 | } | |
4235b045 | 3012 | |
eb948e50 | 3013 | out: |
eebc509b | 3014 | map__put(map); |
6bb536cc | 3015 | free(syms); |
eb948e50 | 3016 | return ret; |
225466f1 | 3017 | |
eb948e50 MH |
3018 | nomem_out: |
3019 | ret = -ENOMEM; | |
3020 | err_out: | |
3021 | clear_probe_trace_events(*tevs, num_matched_functions); | |
3022 | zfree(tevs); | |
3023 | goto out; | |
3024 | } | |
1c1bc922 | 3025 | |
da15bd9d WN |
3026 | static int try_to_find_absolute_address(struct perf_probe_event *pev, |
3027 | struct probe_trace_event **tevs) | |
3028 | { | |
3029 | struct perf_probe_point *pp = &pev->point; | |
3030 | struct probe_trace_event *tev; | |
3031 | struct probe_trace_point *tp; | |
3032 | int i, err; | |
3033 | ||
3034 | if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) | |
3035 | return -EINVAL; | |
3036 | if (perf_probe_event_need_dwarf(pev)) | |
3037 | return -EINVAL; | |
3038 | ||
3039 | /* | |
3040 | * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at | |
3041 | * absolute address. | |
3042 | * | |
3043 | * Only one tev can be generated by this. | |
3044 | */ | |
3045 | *tevs = zalloc(sizeof(*tev)); | |
3046 | if (!*tevs) | |
3047 | return -ENOMEM; | |
3048 | ||
3049 | tev = *tevs; | |
3050 | tp = &tev->point; | |
3051 | ||
3052 | /* | |
3053 | * Don't use tp->offset, use address directly, because | |
3054 | * in synthesize_probe_trace_command() address cannot be | |
3055 | * zero. | |
3056 | */ | |
3057 | tp->address = pev->point.abs_address; | |
3058 | tp->retprobe = pp->retprobe; | |
3059 | tev->uprobes = pev->uprobes; | |
3060 | ||
3061 | err = -ENOMEM; | |
3062 | /* | |
3063 | * Give it a '0x' leading symbol name. | |
3064 | * In __add_probe_trace_events, a NULL symbol is interpreted as | |
adba1634 | 3065 | * invalid. |
da15bd9d WN |
3066 | */ |
3067 | if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) | |
3068 | goto errout; | |
3069 | ||
3070 | /* For kprobe, check range */ | |
3071 | if ((!tev->uprobes) && | |
3072 | (kprobe_warn_out_range(tev->point.symbol, | |
3073 | tev->point.address))) { | |
3074 | err = -EACCES; | |
3075 | goto errout; | |
3076 | } | |
3077 | ||
3078 | if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) | |
3079 | goto errout; | |
3080 | ||
3081 | if (pev->target) { | |
3082 | tp->module = strdup(pev->target); | |
3083 | if (!tp->module) | |
3084 | goto errout; | |
3085 | } | |
3086 | ||
3087 | if (tev->group) { | |
3088 | tev->group = strdup(pev->group); | |
3089 | if (!tev->group) | |
3090 | goto errout; | |
3091 | } | |
3092 | ||
3093 | if (pev->event) { | |
3094 | tev->event = strdup(pev->event); | |
3095 | if (!tev->event) | |
3096 | goto errout; | |
3097 | } | |
3098 | ||
3099 | tev->nargs = pev->nargs; | |
3100 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
d1d0e29c | 3101 | if (!tev->args) |
da15bd9d | 3102 | goto errout; |
d1d0e29c | 3103 | |
da15bd9d WN |
3104 | for (i = 0; i < tev->nargs; i++) |
3105 | copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); | |
3106 | ||
3107 | return 1; | |
3108 | ||
3109 | errout: | |
42e233ca ME |
3110 | clear_probe_trace_events(*tevs, 1); |
3111 | *tevs = NULL; | |
da15bd9d WN |
3112 | return err; |
3113 | } | |
3114 | ||
42bba263 MH |
3115 | /* Concatinate two arrays */ |
3116 | static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) | |
3117 | { | |
3118 | void *ret; | |
3119 | ||
3120 | ret = malloc(sz_a + sz_b); | |
3121 | if (ret) { | |
3122 | memcpy(ret, a, sz_a); | |
3123 | memcpy(ret + sz_a, b, sz_b); | |
3124 | } | |
3125 | return ret; | |
3126 | } | |
3127 | ||
3128 | static int | |
3129 | concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, | |
3130 | struct probe_trace_event **tevs2, int ntevs2) | |
3131 | { | |
3132 | struct probe_trace_event *new_tevs; | |
3133 | int ret = 0; | |
3134 | ||
f0a30dca | 3135 | if (*ntevs == 0) { |
42bba263 MH |
3136 | *tevs = *tevs2; |
3137 | *ntevs = ntevs2; | |
3138 | *tevs2 = NULL; | |
3139 | return 0; | |
3140 | } | |
3141 | ||
3142 | if (*ntevs + ntevs2 > probe_conf.max_probes) | |
3143 | ret = -E2BIG; | |
3144 | else { | |
3145 | /* Concatinate the array of probe_trace_event */ | |
3146 | new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), | |
3147 | *tevs2, ntevs2 * sizeof(**tevs2)); | |
3148 | if (!new_tevs) | |
3149 | ret = -ENOMEM; | |
3150 | else { | |
3151 | free(*tevs); | |
3152 | *tevs = new_tevs; | |
3153 | *ntevs += ntevs2; | |
3154 | } | |
3155 | } | |
3156 | if (ret < 0) | |
3157 | clear_probe_trace_events(*tevs2, ntevs2); | |
3158 | zfree(tevs2); | |
3159 | ||
3160 | return ret; | |
3161 | } | |
3162 | ||
3163 | /* | |
3164 | * Try to find probe_trace_event from given probe caches. Return the number | |
3165 | * of cached events found, if an error occurs return the error. | |
3166 | */ | |
3167 | static int find_cached_events(struct perf_probe_event *pev, | |
3168 | struct probe_trace_event **tevs, | |
3169 | const char *target) | |
3170 | { | |
3171 | struct probe_cache *cache; | |
3172 | struct probe_cache_entry *entry; | |
3173 | struct probe_trace_event *tmp_tevs = NULL; | |
3174 | int ntevs = 0; | |
3175 | int ret = 0; | |
3176 | ||
f045b8c4 | 3177 | cache = probe_cache__new(target, pev->nsi); |
42bba263 MH |
3178 | /* Return 0 ("not found") if the target has no probe cache. */ |
3179 | if (!cache) | |
3180 | return 0; | |
3181 | ||
3182 | for_each_probe_cache_entry(entry, cache) { | |
3183 | /* Skip the cache entry which has no name */ | |
3184 | if (!entry->pev.event || !entry->pev.group) | |
3185 | continue; | |
3186 | if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && | |
3187 | strglobmatch(entry->pev.event, pev->event)) { | |
3188 | ret = probe_cache_entry__get_event(entry, &tmp_tevs); | |
3189 | if (ret > 0) | |
3190 | ret = concat_probe_trace_events(tevs, &ntevs, | |
3191 | &tmp_tevs, ret); | |
3192 | if (ret < 0) | |
3193 | break; | |
3194 | } | |
3195 | } | |
3196 | probe_cache__delete(cache); | |
3197 | if (ret < 0) { | |
3198 | clear_probe_trace_events(*tevs, ntevs); | |
3199 | zfree(tevs); | |
3200 | } else { | |
3201 | ret = ntevs; | |
3202 | if (ntevs > 0 && target && target[0] == '/') | |
3203 | pev->uprobes = true; | |
3204 | } | |
3205 | ||
3206 | return ret; | |
3207 | } | |
3208 | ||
1de7b8bf MH |
3209 | /* Try to find probe_trace_event from all probe caches */ |
3210 | static int find_cached_events_all(struct perf_probe_event *pev, | |
3211 | struct probe_trace_event **tevs) | |
3212 | { | |
3213 | struct probe_trace_event *tmp_tevs = NULL; | |
3214 | struct strlist *bidlist; | |
3215 | struct str_node *nd; | |
3216 | char *pathname; | |
3217 | int ntevs = 0; | |
3218 | int ret; | |
3219 | ||
3220 | /* Get the buildid list of all valid caches */ | |
3221 | bidlist = build_id_cache__list_all(true); | |
3222 | if (!bidlist) { | |
3223 | ret = -errno; | |
3224 | pr_debug("Failed to get buildids: %d\n", ret); | |
3225 | return ret; | |
3226 | } | |
3227 | ||
3228 | ret = 0; | |
3229 | strlist__for_each_entry(nd, bidlist) { | |
3230 | pathname = build_id_cache__origname(nd->s); | |
3231 | ret = find_cached_events(pev, &tmp_tevs, pathname); | |
3232 | /* In the case of cnt == 0, we just skip it */ | |
3233 | if (ret > 0) | |
3234 | ret = concat_probe_trace_events(tevs, &ntevs, | |
3235 | &tmp_tevs, ret); | |
3236 | free(pathname); | |
3237 | if (ret < 0) | |
3238 | break; | |
3239 | } | |
3240 | strlist__delete(bidlist); | |
3241 | ||
3242 | if (ret < 0) { | |
3243 | clear_probe_trace_events(*tevs, ntevs); | |
3244 | zfree(tevs); | |
3245 | } else | |
3246 | ret = ntevs; | |
3247 | ||
3248 | return ret; | |
3249 | } | |
3250 | ||
bc062230 MH |
3251 | static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, |
3252 | struct probe_trace_event **tevs) | |
3253 | { | |
3254 | struct probe_cache *cache; | |
3255 | struct probe_cache_entry *entry; | |
3256 | struct probe_trace_event *tev; | |
3257 | struct str_node *node; | |
3258 | int ret, i; | |
3259 | ||
1de7b8bf | 3260 | if (pev->sdt) { |
42bba263 | 3261 | /* For SDT/cached events, we use special search functions */ |
1de7b8bf MH |
3262 | if (!pev->target) |
3263 | return find_cached_events_all(pev, tevs); | |
3264 | else | |
3265 | return find_cached_events(pev, tevs, pev->target); | |
3266 | } | |
f045b8c4 | 3267 | cache = probe_cache__new(pev->target, pev->nsi); |
bc062230 MH |
3268 | if (!cache) |
3269 | return 0; | |
3270 | ||
3271 | entry = probe_cache__find(cache, pev); | |
3272 | if (!entry) { | |
36a009fe MH |
3273 | /* SDT must be in the cache */ |
3274 | ret = pev->sdt ? -ENOENT : 0; | |
bc062230 MH |
3275 | goto out; |
3276 | } | |
3277 | ||
3278 | ret = strlist__nr_entries(entry->tevlist); | |
3279 | if (ret > probe_conf.max_probes) { | |
3280 | pr_debug("Too many entries matched in the cache of %s\n", | |
3281 | pev->target ? : "kernel"); | |
3282 | ret = -E2BIG; | |
3283 | goto out; | |
3284 | } | |
3285 | ||
3286 | *tevs = zalloc(ret * sizeof(*tev)); | |
3287 | if (!*tevs) { | |
3288 | ret = -ENOMEM; | |
3289 | goto out; | |
3290 | } | |
3291 | ||
3292 | i = 0; | |
3293 | strlist__for_each_entry(node, entry->tevlist) { | |
3294 | tev = &(*tevs)[i++]; | |
3295 | ret = parse_probe_trace_command(node->s, tev); | |
3296 | if (ret < 0) | |
3297 | goto out; | |
3298 | /* Set the uprobes attribute as same as original */ | |
3299 | tev->uprobes = pev->uprobes; | |
3300 | } | |
3301 | ret = i; | |
3302 | ||
3303 | out: | |
3304 | probe_cache__delete(cache); | |
3305 | return ret; | |
3306 | } | |
3307 | ||
eb948e50 | 3308 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 3309 | struct probe_trace_event **tevs) |
eb948e50 MH |
3310 | { |
3311 | int ret; | |
3312 | ||
36a009fe | 3313 | if (!pev->group && !pev->sdt) { |
2a12ec13 MH |
3314 | /* Set group name if not given */ |
3315 | if (!pev->uprobes) { | |
3316 | pev->group = strdup(PERFPROBE_GROUP); | |
3317 | ret = pev->group ? 0 : -ENOMEM; | |
3318 | } else | |
3319 | ret = convert_exec_to_group(pev->target, &pev->group); | |
eb948e50 MH |
3320 | if (ret != 0) { |
3321 | pr_warning("Failed to make a group name.\n"); | |
3322 | return ret; | |
3323 | } | |
02b95dad | 3324 | } |
e334016f | 3325 | |
da15bd9d WN |
3326 | ret = try_to_find_absolute_address(pev, tevs); |
3327 | if (ret > 0) | |
3328 | return ret; | |
3329 | ||
bc062230 MH |
3330 | /* At first, we need to lookup cache entry */ |
3331 | ret = find_probe_trace_events_from_cache(pev, tevs); | |
36a009fe MH |
3332 | if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ |
3333 | return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ | |
bc062230 | 3334 | |
eb948e50 | 3335 | /* Convert perf_probe_event with debuginfo */ |
ddb2f58f | 3336 | ret = try_to_find_probe_trace_events(pev, tevs); |
eb948e50 MH |
3337 | if (ret != 0) |
3338 | return ret; /* Found in debuginfo or got an error */ | |
3339 | ||
ddb2f58f | 3340 | return find_probe_trace_events_from_map(pev, tevs); |
4235b045 MH |
3341 | } |
3342 | ||
12fae5ef | 3343 | int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
4235b045 | 3344 | { |
844dffa5 | 3345 | int i, ret; |
4235b045 | 3346 | |
4235b045 MH |
3347 | /* Loop 1: convert all events */ |
3348 | for (i = 0; i < npevs; i++) { | |
b031220d | 3349 | /* Init kprobe blacklist if needed */ |
12fae5ef | 3350 | if (!pevs[i].uprobes) |
b031220d | 3351 | kprobe_blacklist__init(); |
4235b045 | 3352 | /* Convert with or without debuginfo */ |
12fae5ef | 3353 | ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); |
146a1439 | 3354 | if (ret < 0) |
844dffa5 | 3355 | return ret; |
12fae5ef | 3356 | pevs[i].ntevs = ret; |
e0faa8d3 | 3357 | } |
b031220d MH |
3358 | /* This just release blacklist only if allocated */ |
3359 | kprobe_blacklist__release(); | |
e0faa8d3 | 3360 | |
844dffa5 NK |
3361 | return 0; |
3362 | } | |
3363 | ||
1c20b1d1 MH |
3364 | static int show_probe_trace_event(struct probe_trace_event *tev) |
3365 | { | |
3366 | char *buf = synthesize_probe_trace_command(tev); | |
3367 | ||
3368 | if (!buf) { | |
3369 | pr_debug("Failed to synthesize probe trace event.\n"); | |
3370 | return -EINVAL; | |
3371 | } | |
3372 | ||
3373 | /* Showing definition always go stdout */ | |
3374 | printf("%s\n", buf); | |
3375 | free(buf); | |
3376 | ||
3377 | return 0; | |
3378 | } | |
3379 | ||
3380 | int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) | |
3381 | { | |
3382 | struct strlist *namelist = strlist__new(NULL, NULL); | |
3383 | struct probe_trace_event *tev; | |
3384 | struct perf_probe_event *pev; | |
3385 | int i, j, ret = 0; | |
3386 | ||
3387 | if (!namelist) | |
3388 | return -ENOMEM; | |
3389 | ||
3390 | for (j = 0; j < npevs && !ret; j++) { | |
3391 | pev = &pevs[j]; | |
3392 | for (i = 0; i < pev->ntevs && !ret; i++) { | |
3393 | tev = &pev->tevs[i]; | |
3394 | /* Skip if the symbol is out of .text or blacklisted */ | |
3395 | if (!tev->point.symbol && !pev->uprobes) | |
3396 | continue; | |
3397 | ||
3398 | /* Set new name for tev (and update namelist) */ | |
3399 | ret = probe_trace_event__set_name(tev, pev, | |
3400 | namelist, true); | |
3401 | if (!ret) | |
3402 | ret = show_probe_trace_event(tev); | |
3403 | } | |
3404 | } | |
3405 | strlist__delete(namelist); | |
3406 | ||
3407 | return ret; | |
3408 | } | |
3409 | ||
12fae5ef | 3410 | int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
3411 | { |
3412 | int i, ret = 0; | |
3413 | ||
4235b045 | 3414 | /* Loop 2: add all events */ |
8635bf6e | 3415 | for (i = 0; i < npevs; i++) { |
12fae5ef WN |
3416 | ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, |
3417 | pevs[i].ntevs, | |
ddb2f58f | 3418 | probe_conf.force_add); |
fbee632d ACM |
3419 | if (ret < 0) |
3420 | break; | |
3421 | } | |
844dffa5 NK |
3422 | return ret; |
3423 | } | |
3424 | ||
12fae5ef | 3425 | void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
3426 | { |
3427 | int i, j; | |
544abd44 | 3428 | struct perf_probe_event *pev; |
844dffa5 | 3429 | |
449e5b24 MH |
3430 | /* Loop 3: cleanup and free trace events */ |
3431 | for (i = 0; i < npevs; i++) { | |
544abd44 | 3432 | pev = &pevs[i]; |
12fae5ef WN |
3433 | for (j = 0; j < pevs[i].ntevs; j++) |
3434 | clear_probe_trace_event(&pevs[i].tevs[j]); | |
3435 | zfree(&pevs[i].tevs); | |
3436 | pevs[i].ntevs = 0; | |
544abd44 | 3437 | nsinfo__zput(pev->nsi); |
a43aac29 | 3438 | clear_perf_probe_event(&pevs[i]); |
449e5b24 | 3439 | } |
844dffa5 NK |
3440 | } |
3441 | ||
3442 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) | |
3443 | { | |
3444 | int ret; | |
844dffa5 | 3445 | |
9bae1e8c NK |
3446 | ret = init_probe_symbol_maps(pevs->uprobes); |
3447 | if (ret < 0) | |
3448 | return ret; | |
3449 | ||
12fae5ef | 3450 | ret = convert_perf_probe_events(pevs, npevs); |
844dffa5 | 3451 | if (ret == 0) |
12fae5ef | 3452 | ret = apply_perf_probe_events(pevs, npevs); |
844dffa5 | 3453 | |
12fae5ef | 3454 | cleanup_perf_probe_events(pevs, npevs); |
146a1439 | 3455 | |
9bae1e8c | 3456 | exit_probe_symbol_maps(); |
146a1439 | 3457 | return ret; |
e0faa8d3 MH |
3458 | } |
3459 | ||
307a464b | 3460 | int del_perf_probe_events(struct strfilter *filter) |
fa28244d | 3461 | { |
307a464b | 3462 | int ret, ret2, ufd = -1, kfd = -1; |
307a464b MH |
3463 | char *str = strfilter__string(filter); |
3464 | ||
3465 | if (!str) | |
3466 | return -EINVAL; | |
3467 | ||
fa28244d | 3468 | /* Get current event names */ |
92f6c72e MH |
3469 | ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); |
3470 | if (ret < 0) | |
3471 | goto out; | |
467ec085 | 3472 | |
92f6c72e | 3473 | ret = probe_file__del_events(kfd, filter); |
307a464b | 3474 | if (ret < 0 && ret != -ENOENT) |
225466f1 | 3475 | goto error; |
225466f1 | 3476 | |
92f6c72e | 3477 | ret2 = probe_file__del_events(ufd, filter); |
dddc7ee3 | 3478 | if (ret2 < 0 && ret2 != -ENOENT) { |
307a464b | 3479 | ret = ret2; |
dddc7ee3 MH |
3480 | goto error; |
3481 | } | |
dddc7ee3 | 3482 | ret = 0; |
225466f1 SD |
3483 | |
3484 | error: | |
92f6c72e | 3485 | if (kfd >= 0) |
225466f1 | 3486 | close(kfd); |
92f6c72e | 3487 | if (ufd >= 0) |
225466f1 | 3488 | close(ufd); |
92f6c72e | 3489 | out: |
307a464b | 3490 | free(str); |
146a1439 MH |
3491 | |
3492 | return ret; | |
fa28244d | 3493 | } |
225466f1 | 3494 | |
544abd44 KJ |
3495 | int show_available_funcs(const char *target, struct nsinfo *nsi, |
3496 | struct strfilter *_filter, bool user) | |
e80711ca | 3497 | { |
fd227598 | 3498 | struct rb_node *nd; |
e80711ca MH |
3499 | struct map *map; |
3500 | int ret; | |
3501 | ||
9bae1e8c | 3502 | ret = init_probe_symbol_maps(user); |
e80711ca MH |
3503 | if (ret < 0) |
3504 | return ret; | |
3505 | ||
2df58634 | 3506 | /* Get a symbol map */ |
544abd44 | 3507 | map = get_target_map(target, nsi, user); |
e80711ca | 3508 | if (!map) { |
2df58634 | 3509 | pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); |
e80711ca MH |
3510 | return -EINVAL; |
3511 | } | |
225466f1 | 3512 | |
be39db9f | 3513 | ret = map__load(map); |
e7049342 MH |
3514 | if (ret) { |
3515 | if (ret == -2) { | |
3516 | char *str = strfilter__string(_filter); | |
3517 | pr_err("Failed to find symbols matched to \"%s\"\n", | |
3518 | str); | |
3519 | free(str); | |
3520 | } else | |
3521 | pr_err("Failed to load symbols in %s\n", | |
3522 | (target) ? : "kernel"); | |
2df58634 MH |
3523 | goto end; |
3524 | } | |
3183f8ca ACM |
3525 | if (!dso__sorted_by_name(map->dso)) |
3526 | dso__sort_by_name(map->dso); | |
225466f1 | 3527 | |
2df58634 MH |
3528 | /* Show all (filtered) symbols */ |
3529 | setup_pager(); | |
fd227598 | 3530 | |
3183f8ca | 3531 | for (nd = rb_first(&map->dso->symbol_names); nd; nd = rb_next(nd)) { |
fd227598 ACM |
3532 | struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); |
3533 | ||
3534 | if (strfilter__compare(_filter, pos->sym.name)) | |
3535 | printf("%s\n", pos->sym.name); | |
3183f8ca | 3536 | } |
2df58634 | 3537 | end: |
eebc509b | 3538 | map__put(map); |
9bae1e8c | 3539 | exit_probe_symbol_maps(); |
225466f1 | 3540 | |
2df58634 | 3541 | return ret; |
225466f1 SD |
3542 | } |
3543 | ||
da15bd9d WN |
3544 | int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, |
3545 | struct perf_probe_arg *pvar) | |
3546 | { | |
3547 | tvar->value = strdup(pvar->var); | |
3548 | if (tvar->value == NULL) | |
3549 | return -ENOMEM; | |
3550 | if (pvar->type) { | |
3551 | tvar->type = strdup(pvar->type); | |
3552 | if (tvar->type == NULL) | |
3553 | return -ENOMEM; | |
3554 | } | |
3555 | if (pvar->name) { | |
3556 | tvar->name = strdup(pvar->name); | |
3557 | if (tvar->name == NULL) | |
3558 | return -ENOMEM; | |
3559 | } else | |
3560 | tvar->name = NULL; | |
3561 | return 0; | |
3562 | } |