Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
50656eec | 2 | /* |
0e60836b | 3 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
4 | * |
5 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
50656eec MH |
6 | */ |
7 | ||
fd20e811 | 8 | #include <inttypes.h> |
50656eec MH |
9 | #include <sys/utsname.h> |
10 | #include <sys/types.h> | |
11 | #include <sys/stat.h> | |
12 | #include <fcntl.h> | |
13 | #include <errno.h> | |
14 | #include <stdio.h> | |
15 | #include <unistd.h> | |
16 | #include <stdlib.h> | |
17 | #include <string.h> | |
4de189fe MH |
18 | #include <stdarg.h> |
19 | #include <limits.h> | |
e80711ca | 20 | #include <elf.h> |
50656eec | 21 | |
31facc5f | 22 | #include "util.h" |
50656eec | 23 | #include "event.h" |
40f3b2d2 | 24 | #include "namespaces.h" |
4de189fe | 25 | #include "strlist.h" |
8ec20b17 | 26 | #include "strfilter.h" |
50656eec | 27 | #include "debug.h" |
72041334 | 28 | #include "cache.h" |
631c9def | 29 | #include "color.h" |
1101f69a | 30 | #include "map.h" |
41f30914 | 31 | #include "map_groups.h" |
e0faa8d3 MH |
32 | #include "symbol.h" |
33 | #include "thread.h" | |
4605eab3 | 34 | #include <api/fs/fs.h> |
1d037ca1 | 35 | #include "trace-event.h" /* For __maybe_unused */ |
50656eec | 36 | #include "probe-event.h" |
4235b045 | 37 | #include "probe-finder.h" |
92f6c72e | 38 | #include "probe-file.h" |
225466f1 | 39 | #include "session.h" |
a067558e | 40 | #include "string2.h" |
50656eec | 41 | |
3d689ed6 ACM |
42 | #include "sane_ctype.h" |
43 | ||
50656eec MH |
44 | #define PERFPROBE_GROUP "probe" |
45 | ||
f4d7da49 | 46 | bool probe_event_dry_run; /* Dry run flag */ |
ddb2f58f | 47 | struct probe_conf probe_conf; |
f4d7da49 | 48 | |
146a1439 | 49 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 50 | |
92f6c72e | 51 | int e_snprintf(char *str, size_t size, const char *format, ...) |
4de189fe MH |
52 | { |
53 | int ret; | |
54 | va_list ap; | |
55 | va_start(ap, format); | |
56 | ret = vsnprintf(str, size, format, ap); | |
57 | va_end(ap); | |
58 | if (ret >= (int)size) | |
59 | ret = -E2BIG; | |
60 | return ret; | |
61 | } | |
62 | ||
ee45b6c2 | 63 | static struct machine *host_machine; |
e0faa8d3 | 64 | |
469b9b88 | 65 | /* Initialize symbol maps and path of vmlinux/modules */ |
9bae1e8c | 66 | int init_probe_symbol_maps(bool user_only) |
e0faa8d3 | 67 | { |
146a1439 MH |
68 | int ret; |
69 | ||
e0faa8d3 | 70 | symbol_conf.sort_by_name = true; |
680d926a | 71 | symbol_conf.allow_aliases = true; |
0a7e6d1b | 72 | ret = symbol__init(NULL); |
146a1439 MH |
73 | if (ret < 0) { |
74 | pr_debug("Failed to init symbol map.\n"); | |
75 | goto out; | |
76 | } | |
e0faa8d3 | 77 | |
ee45b6c2 MH |
78 | if (host_machine || user_only) /* already initialized */ |
79 | return 0; | |
d28c6223 | 80 | |
ee45b6c2 MH |
81 | if (symbol_conf.vmlinux_name) |
82 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
83 | ||
84 | host_machine = machine__new_host(); | |
85 | if (!host_machine) { | |
86 | pr_debug("machine__new_host() failed.\n"); | |
87 | symbol__exit(); | |
88 | ret = -1; | |
469b9b88 | 89 | } |
146a1439 MH |
90 | out: |
91 | if (ret < 0) | |
92 | pr_warning("Failed to init vmlinux path.\n"); | |
93 | return ret; | |
e0faa8d3 MH |
94 | } |
95 | ||
9bae1e8c | 96 | void exit_probe_symbol_maps(void) |
ee45b6c2 | 97 | { |
32ca678d ACM |
98 | machine__delete(host_machine); |
99 | host_machine = NULL; | |
ee45b6c2 MH |
100 | symbol__exit(); |
101 | } | |
102 | ||
8f33f7de MH |
103 | static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void) |
104 | { | |
105 | /* kmap->ref_reloc_sym should be set if host_machine is initialized */ | |
106 | struct kmap *kmap; | |
a5e813c6 | 107 | struct map *map = machine__kernel_map(host_machine); |
8f33f7de | 108 | |
be39db9f | 109 | if (map__load(map) < 0) |
8f33f7de MH |
110 | return NULL; |
111 | ||
77e65977 | 112 | kmap = map__kmap(map); |
ba92732e WN |
113 | if (!kmap) |
114 | return NULL; | |
8f33f7de MH |
115 | return kmap->ref_reloc_sym; |
116 | } | |
117 | ||
9b239a12 MH |
118 | static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, |
119 | bool reloc, bool reladdr) | |
8f33f7de MH |
120 | { |
121 | struct ref_reloc_sym *reloc_sym; | |
122 | struct symbol *sym; | |
123 | struct map *map; | |
124 | ||
125 | /* ref_reloc_sym is just a label. Need a special fix*/ | |
126 | reloc_sym = kernel_get_ref_reloc_sym(); | |
127 | if (reloc_sym && strcmp(name, reloc_sym->name) == 0) | |
9b239a12 | 128 | *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr; |
8f33f7de | 129 | else { |
107cad95 | 130 | sym = machine__find_kernel_symbol_by_name(host_machine, name, &map); |
9b239a12 MH |
131 | if (!sym) |
132 | return -ENOENT; | |
133 | *addr = map->unmap_ip(map, sym->start) - | |
134 | ((reloc) ? 0 : map->reloc) - | |
135 | ((reladdr) ? map->start : 0); | |
8f33f7de MH |
136 | } |
137 | return 0; | |
138 | } | |
139 | ||
e80711ca MH |
140 | static struct map *kernel_get_module_map(const char *module) |
141 | { | |
68a74186 | 142 | struct maps *maps = machine__kernel_maps(host_machine); |
4bb7123d | 143 | struct map *pos; |
e80711ca | 144 | |
14a8fd7c MH |
145 | /* A file path -- this is an offline module */ |
146 | if (module && strchr(module, '/')) | |
eebc509b | 147 | return dso__new_map(module); |
14a8fd7c | 148 | |
eaeffeb9 AH |
149 | if (!module) { |
150 | pos = machine__kernel_map(host_machine); | |
151 | return map__get(pos); | |
152 | } | |
e80711ca | 153 | |
4bb7123d | 154 | for (pos = maps__first(maps); pos; pos = map__next(pos)) { |
cb3f3378 | 155 | /* short_name is "[module]" */ |
e80711ca | 156 | if (strncmp(pos->dso->short_name + 1, module, |
cb3f3378 KK |
157 | pos->dso->short_name_len - 2) == 0 && |
158 | module[pos->dso->short_name_len - 2] == '\0') { | |
f622df5e | 159 | return map__get(pos); |
e80711ca MH |
160 | } |
161 | } | |
162 | return NULL; | |
163 | } | |
164 | ||
544abd44 | 165 | struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) |
9b118aca MH |
166 | { |
167 | /* Init maps of given executable or kernel */ | |
544abd44 KJ |
168 | if (user) { |
169 | struct map *map; | |
170 | ||
171 | map = dso__new_map(target); | |
172 | if (map && map->dso) | |
173 | map->dso->nsinfo = nsinfo__get(nsi); | |
174 | return map; | |
175 | } else { | |
9b118aca | 176 | return kernel_get_module_map(target); |
544abd44 | 177 | } |
9b118aca MH |
178 | } |
179 | ||
fb7345bb MH |
180 | static int convert_exec_to_group(const char *exec, char **result) |
181 | { | |
182 | char *ptr1, *ptr2, *exec_copy; | |
183 | char buf[64]; | |
184 | int ret; | |
185 | ||
186 | exec_copy = strdup(exec); | |
187 | if (!exec_copy) | |
188 | return -ENOMEM; | |
189 | ||
190 | ptr1 = basename(exec_copy); | |
191 | if (!ptr1) { | |
192 | ret = -EINVAL; | |
193 | goto out; | |
194 | } | |
195 | ||
ead1a574 | 196 | for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { |
35726d3a MH |
197 | if (!isalnum(*ptr2) && *ptr2 != '_') { |
198 | *ptr2 = '\0'; | |
199 | break; | |
200 | } | |
201 | } | |
202 | ||
fb7345bb MH |
203 | ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); |
204 | if (ret < 0) | |
205 | goto out; | |
206 | ||
207 | *result = strdup(buf); | |
208 | ret = *result ? 0 : -ENOMEM; | |
209 | ||
210 | out: | |
211 | free(exec_copy); | |
212 | return ret; | |
213 | } | |
214 | ||
9b118aca MH |
215 | static void clear_perf_probe_point(struct perf_probe_point *pp) |
216 | { | |
217 | free(pp->file); | |
218 | free(pp->function); | |
219 | free(pp->lazy_line); | |
220 | } | |
221 | ||
eb948e50 MH |
222 | static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) |
223 | { | |
224 | int i; | |
225 | ||
226 | for (i = 0; i < ntevs; i++) | |
227 | clear_probe_trace_event(tevs + i); | |
228 | } | |
229 | ||
b031220d MH |
230 | static bool kprobe_blacklist__listed(unsigned long address); |
231 | static bool kprobe_warn_out_range(const char *symbol, unsigned long address) | |
232 | { | |
9b239a12 MH |
233 | u64 etext_addr = 0; |
234 | int ret; | |
7c31bb8c | 235 | |
b031220d | 236 | /* Get the address of _etext for checking non-probable text symbol */ |
9b239a12 MH |
237 | ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, |
238 | false, false); | |
7c31bb8c | 239 | |
9b239a12 | 240 | if (ret == 0 && etext_addr < address) |
b031220d MH |
241 | pr_warning("%s is out of .text, skip it.\n", symbol); |
242 | else if (kprobe_blacklist__listed(address)) | |
243 | pr_warning("%s is blacklisted function, skip it.\n", symbol); | |
244 | else | |
245 | return false; | |
246 | ||
247 | return true; | |
248 | } | |
249 | ||
c61fb959 RB |
250 | /* |
251 | * @module can be module name of module file path. In case of path, | |
252 | * inspect elf and find out what is actual module name. | |
253 | * Caller has to free mod_name after using it. | |
254 | */ | |
255 | static char *find_module_name(const char *module) | |
256 | { | |
257 | int fd; | |
258 | Elf *elf; | |
259 | GElf_Ehdr ehdr; | |
260 | GElf_Shdr shdr; | |
261 | Elf_Data *data; | |
262 | Elf_Scn *sec; | |
263 | char *mod_name = NULL; | |
1f2ed153 | 264 | int name_offset; |
c61fb959 RB |
265 | |
266 | fd = open(module, O_RDONLY); | |
267 | if (fd < 0) | |
268 | return NULL; | |
269 | ||
270 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
271 | if (elf == NULL) | |
272 | goto elf_err; | |
273 | ||
274 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
275 | goto ret_err; | |
276 | ||
277 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
278 | ".gnu.linkonce.this_module", NULL); | |
279 | if (!sec) | |
280 | goto ret_err; | |
281 | ||
282 | data = elf_getdata(sec, NULL); | |
283 | if (!data || !data->d_buf) | |
284 | goto ret_err; | |
285 | ||
1f2ed153 MH |
286 | /* |
287 | * NOTE: | |
288 | * '.gnu.linkonce.this_module' section of kernel module elf directly | |
289 | * maps to 'struct module' from linux/module.h. This section contains | |
290 | * actual module name which will be used by kernel after loading it. | |
291 | * But, we cannot use 'struct module' here since linux/module.h is not | |
292 | * exposed to user-space. Offset of 'name' has remained same from long | |
293 | * time, so hardcoding it here. | |
294 | */ | |
295 | if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) | |
296 | name_offset = 12; | |
297 | else /* expect ELFCLASS64 by default */ | |
298 | name_offset = 24; | |
299 | ||
300 | mod_name = strdup((char *)data->d_buf + name_offset); | |
c61fb959 RB |
301 | |
302 | ret_err: | |
303 | elf_end(elf); | |
304 | elf_err: | |
305 | close(fd); | |
306 | return mod_name; | |
307 | } | |
308 | ||
89fe808a | 309 | #ifdef HAVE_DWARF_SUPPORT |
60fb7742 WN |
310 | |
311 | static int kernel_get_module_dso(const char *module, struct dso **pdso) | |
312 | { | |
313 | struct dso *dso; | |
314 | struct map *map; | |
315 | const char *vmlinux_name; | |
316 | int ret = 0; | |
317 | ||
318 | if (module) { | |
266fa2b2 ACM |
319 | char module_name[128]; |
320 | ||
321 | snprintf(module_name, sizeof(module_name), "[%s]", module); | |
83cf774b | 322 | map = map_groups__find_by_name(&host_machine->kmaps, module_name); |
266fa2b2 ACM |
323 | if (map) { |
324 | dso = map->dso; | |
325 | goto found; | |
60fb7742 WN |
326 | } |
327 | pr_debug("Failed to find module %s.\n", module); | |
328 | return -ENOENT; | |
329 | } | |
330 | ||
a5e813c6 | 331 | map = machine__kernel_map(host_machine); |
60fb7742 WN |
332 | dso = map->dso; |
333 | ||
334 | vmlinux_name = symbol_conf.vmlinux_name; | |
335 | dso->load_errno = 0; | |
336 | if (vmlinux_name) | |
be39db9f | 337 | ret = dso__load_vmlinux(dso, map, vmlinux_name, false); |
60fb7742 | 338 | else |
be39db9f | 339 | ret = dso__load_vmlinux_path(dso, map); |
60fb7742 WN |
340 | found: |
341 | *pdso = dso; | |
342 | return ret; | |
343 | } | |
344 | ||
9b118aca MH |
345 | /* |
346 | * Some binaries like glibc have special symbols which are on the symbol | |
347 | * table, but not in the debuginfo. If we can find the address of the | |
348 | * symbol from map, we can translate the address back to the probe point. | |
349 | */ | |
350 | static int find_alternative_probe_point(struct debuginfo *dinfo, | |
351 | struct perf_probe_point *pp, | |
352 | struct perf_probe_point *result, | |
544abd44 KJ |
353 | const char *target, struct nsinfo *nsi, |
354 | bool uprobes) | |
9b118aca MH |
355 | { |
356 | struct map *map = NULL; | |
357 | struct symbol *sym; | |
358 | u64 address = 0; | |
359 | int ret = -ENOENT; | |
360 | ||
361 | /* This can work only for function-name based one */ | |
362 | if (!pp->function || pp->file) | |
363 | return -ENOTSUP; | |
364 | ||
544abd44 | 365 | map = get_target_map(target, nsi, uprobes); |
9b118aca MH |
366 | if (!map) |
367 | return -EINVAL; | |
368 | ||
369 | /* Find the address of given function */ | |
370 | map__for_each_symbol_by_name(map, pp->function, sym) { | |
e6d7c91c MH |
371 | if (uprobes) |
372 | address = sym->start; | |
373 | else | |
8e34189b | 374 | address = map->unmap_ip(map, sym->start) - map->reloc; |
e578da3b | 375 | break; |
9b118aca MH |
376 | } |
377 | if (!address) { | |
378 | ret = -ENOENT; | |
379 | goto out; | |
380 | } | |
f6c15621 WN |
381 | pr_debug("Symbol %s address found : %" PRIx64 "\n", |
382 | pp->function, address); | |
9b118aca MH |
383 | |
384 | ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, | |
385 | result); | |
386 | if (ret <= 0) | |
387 | ret = (!ret) ? -ENOENT : ret; | |
388 | else { | |
389 | result->offset += pp->offset; | |
390 | result->line += pp->line; | |
9d7b45c5 | 391 | result->retprobe = pp->retprobe; |
9b118aca MH |
392 | ret = 0; |
393 | } | |
394 | ||
395 | out: | |
eebc509b | 396 | map__put(map); |
9b118aca MH |
397 | return ret; |
398 | ||
399 | } | |
400 | ||
401 | static int get_alternative_probe_event(struct debuginfo *dinfo, | |
402 | struct perf_probe_event *pev, | |
44225521 | 403 | struct perf_probe_point *tmp) |
9b118aca MH |
404 | { |
405 | int ret; | |
406 | ||
407 | memcpy(tmp, &pev->point, sizeof(*tmp)); | |
408 | memset(&pev->point, 0, sizeof(pev->point)); | |
544abd44 KJ |
409 | ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, |
410 | pev->nsi, pev->uprobes); | |
9b118aca MH |
411 | if (ret < 0) |
412 | memcpy(&pev->point, tmp, sizeof(*tmp)); | |
413 | ||
414 | return ret; | |
415 | } | |
a15ad2f5 | 416 | |
811dd2ae MH |
417 | static int get_alternative_line_range(struct debuginfo *dinfo, |
418 | struct line_range *lr, | |
419 | const char *target, bool user) | |
420 | { | |
6d4a4896 DA |
421 | struct perf_probe_point pp = { .function = lr->function, |
422 | .file = lr->file, | |
423 | .line = lr->start }; | |
424 | struct perf_probe_point result; | |
811dd2ae MH |
425 | int ret, len = 0; |
426 | ||
6d4a4896 DA |
427 | memset(&result, 0, sizeof(result)); |
428 | ||
811dd2ae MH |
429 | if (lr->end != INT_MAX) |
430 | len = lr->end - lr->start; | |
431 | ret = find_alternative_probe_point(dinfo, &pp, &result, | |
544abd44 | 432 | target, NULL, user); |
811dd2ae MH |
433 | if (!ret) { |
434 | lr->function = result.function; | |
435 | lr->file = result.file; | |
436 | lr->start = result.line; | |
437 | if (lr->end != INT_MAX) | |
438 | lr->end = lr->start + len; | |
439 | clear_perf_probe_point(&pp); | |
440 | } | |
441 | return ret; | |
442 | } | |
443 | ||
ff741783 | 444 | /* Open new debuginfo of given module */ |
544abd44 KJ |
445 | static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi, |
446 | bool silent) | |
e0faa8d3 | 447 | { |
a15ad2f5 | 448 | const char *path = module; |
419e8738 MH |
449 | char reason[STRERR_BUFSIZE]; |
450 | struct debuginfo *ret = NULL; | |
451 | struct dso *dso = NULL; | |
544abd44 | 452 | struct nscookie nsc; |
419e8738 | 453 | int err; |
ff741783 | 454 | |
a15ad2f5 | 455 | if (!module || !strchr(module, '/')) { |
419e8738 MH |
456 | err = kernel_get_module_dso(module, &dso); |
457 | if (err < 0) { | |
458 | if (!dso || dso->load_errno == 0) { | |
c8b5f2c9 | 459 | if (!str_error_r(-err, reason, STRERR_BUFSIZE)) |
419e8738 MH |
460 | strcpy(reason, "(unknown)"); |
461 | } else | |
462 | dso__strerror_load(dso, reason, STRERR_BUFSIZE); | |
4d6101f5 ACM |
463 | if (!silent) { |
464 | if (module) | |
465 | pr_err("Module %s is not loaded, please specify its full path name.\n", module); | |
466 | else | |
467 | pr_err("Failed to find the path for the kernel: %s\n", reason); | |
468 | } | |
14a8fd7c MH |
469 | return NULL; |
470 | } | |
419e8738 | 471 | path = dso->long_name; |
e0faa8d3 | 472 | } |
544abd44 | 473 | nsinfo__mountns_enter(nsi, &nsc); |
92561cb7 MH |
474 | ret = debuginfo__new(path); |
475 | if (!ret && !silent) { | |
476 | pr_warning("The %s file has no debug information.\n", path); | |
477 | if (!module || !strtailcmp(path, ".ko")) | |
478 | pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); | |
479 | else | |
480 | pr_warning("Rebuild with -g, "); | |
481 | pr_warning("or install an appropriate debuginfo package.\n"); | |
482 | } | |
544abd44 | 483 | nsinfo__mountns_exit(&nsc); |
92561cb7 | 484 | return ret; |
e0faa8d3 | 485 | } |
4b4da7f7 | 486 | |
7737af01 MH |
487 | /* For caching the last debuginfo */ |
488 | static struct debuginfo *debuginfo_cache; | |
489 | static char *debuginfo_cache_path; | |
490 | ||
491 | static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) | |
492 | { | |
20f49859 MH |
493 | const char *path = module; |
494 | ||
495 | /* If the module is NULL, it should be the kernel. */ | |
496 | if (!module) | |
497 | path = "kernel"; | |
498 | ||
499 | if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) | |
7737af01 MH |
500 | goto out; |
501 | ||
502 | /* Copy module path */ | |
503 | free(debuginfo_cache_path); | |
20f49859 MH |
504 | debuginfo_cache_path = strdup(path); |
505 | if (!debuginfo_cache_path) { | |
506 | debuginfo__delete(debuginfo_cache); | |
507 | debuginfo_cache = NULL; | |
508 | goto out; | |
7737af01 MH |
509 | } |
510 | ||
544abd44 | 511 | debuginfo_cache = open_debuginfo(module, NULL, silent); |
7737af01 MH |
512 | if (!debuginfo_cache) |
513 | zfree(&debuginfo_cache_path); | |
514 | out: | |
515 | return debuginfo_cache; | |
516 | } | |
517 | ||
518 | static void debuginfo_cache__exit(void) | |
519 | { | |
520 | debuginfo__delete(debuginfo_cache); | |
521 | debuginfo_cache = NULL; | |
522 | zfree(&debuginfo_cache_path); | |
523 | } | |
524 | ||
92561cb7 | 525 | |
544abd44 KJ |
526 | static int get_text_start_address(const char *exec, unsigned long *address, |
527 | struct nsinfo *nsi) | |
99ca4233 MH |
528 | { |
529 | Elf *elf; | |
530 | GElf_Ehdr ehdr; | |
531 | GElf_Shdr shdr; | |
532 | int fd, ret = -ENOENT; | |
544abd44 | 533 | struct nscookie nsc; |
99ca4233 | 534 | |
544abd44 | 535 | nsinfo__mountns_enter(nsi, &nsc); |
99ca4233 | 536 | fd = open(exec, O_RDONLY); |
544abd44 | 537 | nsinfo__mountns_exit(&nsc); |
99ca4233 MH |
538 | if (fd < 0) |
539 | return -errno; | |
540 | ||
541 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
062d6c2a MH |
542 | if (elf == NULL) { |
543 | ret = -EINVAL; | |
544 | goto out_close; | |
545 | } | |
99ca4233 MH |
546 | |
547 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
548 | goto out; | |
549 | ||
550 | if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) | |
551 | goto out; | |
552 | ||
553 | *address = shdr.sh_addr - shdr.sh_offset; | |
554 | ret = 0; | |
555 | out: | |
556 | elf_end(elf); | |
062d6c2a MH |
557 | out_close: |
558 | close(fd); | |
559 | ||
99ca4233 MH |
560 | return ret; |
561 | } | |
562 | ||
5a6f6314 MH |
563 | /* |
564 | * Convert trace point to probe point with debuginfo | |
565 | */ | |
566 | static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, | |
567 | struct perf_probe_point *pp, | |
568 | bool is_kprobe) | |
569 | { | |
570 | struct debuginfo *dinfo = NULL; | |
571 | unsigned long stext = 0; | |
572 | u64 addr = tp->address; | |
573 | int ret = -ENOENT; | |
574 | ||
575 | /* convert the address to dwarf address */ | |
576 | if (!is_kprobe) { | |
577 | if (!addr) { | |
578 | ret = -EINVAL; | |
579 | goto error; | |
580 | } | |
544abd44 | 581 | ret = get_text_start_address(tp->module, &stext, NULL); |
5a6f6314 MH |
582 | if (ret < 0) |
583 | goto error; | |
584 | addr += stext; | |
e486367f | 585 | } else if (tp->symbol) { |
9b239a12 MH |
586 | /* If the module is given, this returns relative address */ |
587 | ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, | |
588 | false, !!tp->module); | |
589 | if (ret != 0) | |
5a6f6314 MH |
590 | goto error; |
591 | addr += tp->offset; | |
592 | } | |
593 | ||
594 | pr_debug("try to find information at %" PRIx64 " in %s\n", addr, | |
595 | tp->module ? : "kernel"); | |
596 | ||
bb963e16 | 597 | dinfo = debuginfo_cache__open(tp->module, verbose <= 0); |
7737af01 | 598 | if (dinfo) |
5a6f6314 MH |
599 | ret = debuginfo__find_probe_point(dinfo, |
600 | (unsigned long)addr, pp); | |
7737af01 | 601 | else |
5a6f6314 | 602 | ret = -ENOENT; |
5a6f6314 MH |
603 | |
604 | if (ret > 0) { | |
605 | pp->retprobe = tp->retprobe; | |
606 | return 0; | |
607 | } | |
608 | error: | |
609 | pr_debug("Failed to find corresponding probes from debuginfo.\n"); | |
610 | return ret ? : -ENOENT; | |
611 | } | |
612 | ||
3e96dac7 MH |
613 | /* Adjust symbol name and address */ |
614 | static int post_process_probe_trace_point(struct probe_trace_point *tp, | |
615 | struct map *map, unsigned long offs) | |
616 | { | |
617 | struct symbol *sym; | |
7598f8bc | 618 | u64 addr = tp->address - offs; |
3e96dac7 MH |
619 | |
620 | sym = map__find_symbol(map, addr); | |
621 | if (!sym) | |
622 | return -ENOENT; | |
623 | ||
624 | if (strcmp(sym->name, tp->symbol)) { | |
625 | /* If we have no realname, use symbol for it */ | |
626 | if (!tp->realname) | |
627 | tp->realname = tp->symbol; | |
628 | else | |
629 | free(tp->symbol); | |
630 | tp->symbol = strdup(sym->name); | |
631 | if (!tp->symbol) | |
632 | return -ENOMEM; | |
633 | } | |
634 | tp->offset = addr - sym->start; | |
635 | tp->address -= offs; | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
8a937a25 MH |
640 | /* |
641 | * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions | |
642 | * and generate new symbols with suffixes such as .constprop.N or .isra.N | |
643 | * etc. Since those symbols are not recorded in DWARF, we have to find | |
644 | * correct generated symbols from offline ELF binary. | |
645 | * For online kernel or uprobes we don't need this because those are | |
646 | * rebased on _text, or already a section relative address. | |
647 | */ | |
648 | static int | |
649 | post_process_offline_probe_trace_events(struct probe_trace_event *tevs, | |
650 | int ntevs, const char *pathname) | |
651 | { | |
8a937a25 MH |
652 | struct map *map; |
653 | unsigned long stext = 0; | |
3e96dac7 | 654 | int i, ret = 0; |
8a937a25 MH |
655 | |
656 | /* Prepare a map for offline binary */ | |
657 | map = dso__new_map(pathname); | |
544abd44 | 658 | if (!map || get_text_start_address(pathname, &stext, NULL) < 0) { |
8a937a25 MH |
659 | pr_warning("Failed to get ELF symbols for %s\n", pathname); |
660 | return -EINVAL; | |
661 | } | |
662 | ||
663 | for (i = 0; i < ntevs; i++) { | |
3e96dac7 MH |
664 | ret = post_process_probe_trace_point(&tevs[i].point, |
665 | map, stext); | |
666 | if (ret < 0) | |
667 | break; | |
8a937a25 MH |
668 | } |
669 | map__put(map); | |
670 | ||
3e96dac7 | 671 | return ret; |
8a937a25 MH |
672 | } |
673 | ||
fb7345bb | 674 | static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, |
544abd44 KJ |
675 | int ntevs, const char *exec, |
676 | struct nsinfo *nsi) | |
fb7345bb MH |
677 | { |
678 | int i, ret = 0; | |
eb948e50 | 679 | unsigned long stext = 0; |
fb7345bb MH |
680 | |
681 | if (!exec) | |
682 | return 0; | |
683 | ||
544abd44 | 684 | ret = get_text_start_address(exec, &stext, nsi); |
fb7345bb MH |
685 | if (ret < 0) |
686 | return ret; | |
687 | ||
688 | for (i = 0; i < ntevs && ret >= 0; i++) { | |
adba1634 | 689 | /* point.address is the address of point.symbol + point.offset */ |
eb948e50 | 690 | tevs[i].point.address -= stext; |
fb7345bb | 691 | tevs[i].point.module = strdup(exec); |
eb948e50 | 692 | if (!tevs[i].point.module) { |
fb7345bb MH |
693 | ret = -ENOMEM; |
694 | break; | |
695 | } | |
696 | tevs[i].uprobes = true; | |
697 | } | |
698 | ||
699 | return ret; | |
700 | } | |
701 | ||
613f050d MH |
702 | static int |
703 | post_process_module_probe_trace_events(struct probe_trace_event *tevs, | |
704 | int ntevs, const char *module, | |
705 | struct debuginfo *dinfo) | |
190b57fc | 706 | { |
613f050d | 707 | Dwarf_Addr text_offs = 0; |
14a8fd7c | 708 | int i, ret = 0; |
63a29613 | 709 | char *mod_name = NULL; |
613f050d | 710 | struct map *map; |
14a8fd7c MH |
711 | |
712 | if (!module) | |
713 | return 0; | |
714 | ||
544abd44 | 715 | map = get_target_map(module, NULL, false); |
613f050d MH |
716 | if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) { |
717 | pr_warning("Failed to get ELF symbols for %s\n", module); | |
718 | return -EINVAL; | |
719 | } | |
14a8fd7c | 720 | |
613f050d | 721 | mod_name = find_module_name(module); |
190b57fc | 722 | for (i = 0; i < ntevs; i++) { |
613f050d MH |
723 | ret = post_process_probe_trace_point(&tevs[i].point, |
724 | map, (unsigned long)text_offs); | |
725 | if (ret < 0) | |
726 | break; | |
63a29613 RB |
727 | tevs[i].point.module = |
728 | strdup(mod_name ? mod_name : module); | |
14a8fd7c MH |
729 | if (!tevs[i].point.module) { |
730 | ret = -ENOMEM; | |
731 | break; | |
732 | } | |
190b57fc | 733 | } |
14a8fd7c | 734 | |
63a29613 | 735 | free(mod_name); |
613f050d MH |
736 | map__put(map); |
737 | ||
14a8fd7c | 738 | return ret; |
190b57fc MH |
739 | } |
740 | ||
d820456d RB |
741 | static int |
742 | post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, | |
743 | int ntevs) | |
dfef99cd MH |
744 | { |
745 | struct ref_reloc_sym *reloc_sym; | |
746 | char *tmp; | |
5a51fcd1 | 747 | int i, skipped = 0; |
dfef99cd | 748 | |
428aff82 MH |
749 | /* Skip post process if the target is an offline kernel */ |
750 | if (symbol_conf.ignore_vmlinux_buildid) | |
8a937a25 MH |
751 | return post_process_offline_probe_trace_events(tevs, ntevs, |
752 | symbol_conf.vmlinux_name); | |
428aff82 | 753 | |
8f33f7de | 754 | reloc_sym = kernel_get_ref_reloc_sym(); |
dfef99cd MH |
755 | if (!reloc_sym) { |
756 | pr_warning("Relocated base symbol is not found!\n"); | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | for (i = 0; i < ntevs; i++) { | |
7ab31d94 NR |
761 | if (!tevs[i].point.address) |
762 | continue; | |
763 | if (tevs[i].point.retprobe && !kretprobe_offset_is_supported()) | |
b031220d MH |
764 | continue; |
765 | /* If we found a wrong one, mark it by NULL symbol */ | |
766 | if (kprobe_warn_out_range(tevs[i].point.symbol, | |
767 | tevs[i].point.address)) { | |
768 | tmp = NULL; | |
769 | skipped++; | |
770 | } else { | |
771 | tmp = strdup(reloc_sym->name); | |
772 | if (!tmp) | |
773 | return -ENOMEM; | |
dfef99cd | 774 | } |
b031220d MH |
775 | /* If we have no realname, use symbol for it */ |
776 | if (!tevs[i].point.realname) | |
777 | tevs[i].point.realname = tevs[i].point.symbol; | |
778 | else | |
779 | free(tevs[i].point.symbol); | |
780 | tevs[i].point.symbol = tmp; | |
781 | tevs[i].point.offset = tevs[i].point.address - | |
782 | reloc_sym->unrelocated_addr; | |
dfef99cd | 783 | } |
5a51fcd1 | 784 | return skipped; |
dfef99cd MH |
785 | } |
786 | ||
99e608b5 RB |
787 | void __weak |
788 | arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused, | |
789 | int ntevs __maybe_unused) | |
790 | { | |
791 | } | |
792 | ||
d820456d | 793 | /* Post processing the probe events */ |
99e608b5 RB |
794 | static int post_process_probe_trace_events(struct perf_probe_event *pev, |
795 | struct probe_trace_event *tevs, | |
d820456d | 796 | int ntevs, const char *module, |
613f050d | 797 | bool uprobe, struct debuginfo *dinfo) |
d820456d | 798 | { |
99e608b5 | 799 | int ret; |
d820456d | 800 | |
99e608b5 | 801 | if (uprobe) |
544abd44 KJ |
802 | ret = add_exec_to_probe_trace_events(tevs, ntevs, module, |
803 | pev->nsi); | |
99e608b5 | 804 | else if (module) |
d820456d | 805 | /* Currently ref_reloc_sym based probe is not for drivers */ |
613f050d MH |
806 | ret = post_process_module_probe_trace_events(tevs, ntevs, |
807 | module, dinfo); | |
99e608b5 RB |
808 | else |
809 | ret = post_process_kernel_probe_trace_events(tevs, ntevs); | |
d820456d | 810 | |
99e608b5 RB |
811 | if (ret >= 0) |
812 | arch__post_process_probe_trace_events(pev, ntevs); | |
813 | ||
814 | return ret; | |
d820456d RB |
815 | } |
816 | ||
4b4da7f7 | 817 | /* Try to find perf_probe_event with debuginfo */ |
0e60836b | 818 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 819 | struct probe_trace_event **tevs) |
4b4da7f7 MH |
820 | { |
821 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
9b118aca | 822 | struct perf_probe_point tmp; |
225466f1 | 823 | struct debuginfo *dinfo; |
190b57fc | 824 | int ntevs, ret = 0; |
4b4da7f7 | 825 | |
544abd44 | 826 | dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf); |
ff741783 | 827 | if (!dinfo) { |
92561cb7 | 828 | if (need_dwarf) |
ff741783 | 829 | return -ENOENT; |
ff741783 | 830 | pr_debug("Could not open debuginfo. Try to use symbols.\n"); |
4b4da7f7 MH |
831 | return 0; |
832 | } | |
833 | ||
dfef99cd | 834 | pr_debug("Try to find probe point from debuginfo.\n"); |
ff741783 | 835 | /* Searching trace events corresponding to a probe event */ |
ddb2f58f | 836 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
ff741783 | 837 | |
9b118aca | 838 | if (ntevs == 0) { /* Not found, retry with an alternative */ |
44225521 | 839 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca | 840 | if (!ret) { |
ddb2f58f | 841 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
9b118aca MH |
842 | /* |
843 | * Write back to the original probe_event for | |
844 | * setting appropriate (user given) event name | |
845 | */ | |
846 | clear_perf_probe_point(&pev->point); | |
847 | memcpy(&pev->point, &tmp, sizeof(tmp)); | |
848 | } | |
849 | } | |
850 | ||
146a1439 | 851 | if (ntevs > 0) { /* Succeeded to find trace events */ |
dfef99cd | 852 | pr_debug("Found %d probe_trace_events.\n", ntevs); |
99e608b5 | 853 | ret = post_process_probe_trace_events(pev, *tevs, ntevs, |
613f050d | 854 | pev->target, pev->uprobes, dinfo); |
5a51fcd1 | 855 | if (ret < 0 || ret == ntevs) { |
613f050d | 856 | pr_debug("Post processing failed or all events are skipped. (%d)\n", ret); |
981d05ad MH |
857 | clear_probe_trace_events(*tevs, ntevs); |
858 | zfree(tevs); | |
613f050d | 859 | ntevs = 0; |
981d05ad | 860 | } |
146a1439 | 861 | } |
4b4da7f7 | 862 | |
613f050d MH |
863 | debuginfo__delete(dinfo); |
864 | ||
146a1439 | 865 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
0687eba7 | 866 | pr_warning("Probe point '%s' not found.\n", |
146a1439 | 867 | synthesize_perf_probe_point(&pev->point)); |
0687eba7 | 868 | return -ENOENT; |
613f050d MH |
869 | } else if (ntevs < 0) { |
870 | /* Error path : ntevs < 0 */ | |
871 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); | |
1c0bd0e8 WN |
872 | if (ntevs == -EBADF) |
873 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
874 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
15eca306 | 875 | if (!need_dwarf) { |
0e43e5d2 | 876 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
877 | return 0; |
878 | } | |
4b4da7f7 | 879 | } |
15eca306 | 880 | return ntevs; |
4b4da7f7 MH |
881 | } |
882 | ||
883 | #define LINEBUF_SIZE 256 | |
884 | #define NR_ADDITIONAL_LINES 2 | |
885 | ||
fde52dbd | 886 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 | 887 | { |
5f03cba4 | 888 | char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; |
befe3414 FBH |
889 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
890 | const char *prefix = NULL; | |
4b4da7f7 | 891 | |
befe3414 | 892 | do { |
4b4da7f7 MH |
893 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
894 | goto error; | |
befe3414 FBH |
895 | if (skip) |
896 | continue; | |
897 | if (!prefix) { | |
898 | prefix = show_num ? "%7d " : " "; | |
899 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 900 | } |
befe3414 FBH |
901 | color_fprintf(stdout, color, "%s", buf); |
902 | ||
903 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 904 | |
fde52dbd | 905 | return 1; |
4b4da7f7 | 906 | error: |
fde52dbd | 907 | if (ferror(fp)) { |
5f03cba4 | 908 | pr_warning("File read error: %s\n", |
c8b5f2c9 | 909 | str_error_r(errno, sbuf, sizeof(sbuf))); |
fde52dbd FBH |
910 | return -1; |
911 | } | |
912 | return 0; | |
913 | } | |
146a1439 | 914 | |
fde52dbd FBH |
915 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
916 | { | |
917 | int rv = __show_one_line(fp, l, skip, show_num); | |
918 | if (rv == 0) { | |
919 | pr_warning("Source file is shorter than expected.\n"); | |
920 | rv = -1; | |
921 | } | |
922 | return rv; | |
4b4da7f7 MH |
923 | } |
924 | ||
fde52dbd FBH |
925 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
926 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
927 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
928 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
929 | ||
4b4da7f7 MH |
930 | /* |
931 | * Show line-range always requires debuginfo to find source file and | |
932 | * line number. | |
933 | */ | |
811dd2ae MH |
934 | static int __show_line_range(struct line_range *lr, const char *module, |
935 | bool user) | |
4b4da7f7 | 936 | { |
d3b63d7a | 937 | int l = 1; |
5a62257a | 938 | struct int_node *ln; |
ff741783 | 939 | struct debuginfo *dinfo; |
4b4da7f7 | 940 | FILE *fp; |
ff741783 | 941 | int ret; |
7cf0b79e | 942 | char *tmp; |
5f03cba4 | 943 | char sbuf[STRERR_BUFSIZE]; |
4b4da7f7 MH |
944 | |
945 | /* Search a line range */ | |
544abd44 | 946 | dinfo = open_debuginfo(module, NULL, false); |
92561cb7 | 947 | if (!dinfo) |
ff741783 | 948 | return -ENOENT; |
146a1439 | 949 | |
ff741783 | 950 | ret = debuginfo__find_line_range(dinfo, lr); |
811dd2ae MH |
951 | if (!ret) { /* Not found, retry with an alternative */ |
952 | ret = get_alternative_line_range(dinfo, lr, module, user); | |
953 | if (!ret) | |
954 | ret = debuginfo__find_line_range(dinfo, lr); | |
955 | } | |
ff741783 | 956 | debuginfo__delete(dinfo); |
5ee05b88 | 957 | if (ret == 0 || ret == -ENOENT) { |
146a1439 MH |
958 | pr_warning("Specified source line is not found.\n"); |
959 | return -ENOENT; | |
960 | } else if (ret < 0) { | |
5ee05b88 | 961 | pr_warning("Debuginfo analysis failed.\n"); |
146a1439 MH |
962 | return ret; |
963 | } | |
4b4da7f7 | 964 | |
7cf0b79e MH |
965 | /* Convert source file path */ |
966 | tmp = lr->path; | |
6a330a3c | 967 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
a78604de HK |
968 | |
969 | /* Free old path when new path is assigned */ | |
970 | if (tmp != lr->path) | |
971 | free(tmp); | |
972 | ||
7cf0b79e | 973 | if (ret < 0) { |
5ee05b88 | 974 | pr_warning("Failed to find source file path.\n"); |
7cf0b79e MH |
975 | return ret; |
976 | } | |
977 | ||
4b4da7f7 MH |
978 | setup_pager(); |
979 | ||
980 | if (lr->function) | |
8737ebde | 981 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
4b4da7f7 MH |
982 | lr->start - lr->offset); |
983 | else | |
62c15fc4 | 984 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
985 | |
986 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
987 | if (fp == NULL) { |
988 | pr_warning("Failed to open %s: %s\n", lr->path, | |
c8b5f2c9 | 989 | str_error_r(errno, sbuf, sizeof(sbuf))); |
146a1439 MH |
990 | return -errno; |
991 | } | |
4b4da7f7 | 992 | /* Skip to starting line number */ |
44b81e92 | 993 | while (l < lr->start) { |
fde52dbd | 994 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
995 | if (ret < 0) |
996 | goto end; | |
997 | } | |
4b4da7f7 | 998 | |
10daf4d0 | 999 | intlist__for_each_entry(ln, lr->line_list) { |
5a62257a | 1000 | for (; ln->i > l; l++) { |
fde52dbd | 1001 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
1002 | if (ret < 0) |
1003 | goto end; | |
1004 | } | |
fde52dbd | 1005 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
1006 | if (ret < 0) |
1007 | goto end; | |
4b4da7f7 MH |
1008 | } |
1009 | ||
1010 | if (lr->end == INT_MAX) | |
1011 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
1012 | while (l <= lr->end) { |
1013 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
1014 | if (ret <= 0) | |
44b81e92 FBH |
1015 | break; |
1016 | } | |
146a1439 | 1017 | end: |
4b4da7f7 | 1018 | fclose(fp); |
146a1439 | 1019 | return ret; |
4b4da7f7 MH |
1020 | } |
1021 | ||
544abd44 KJ |
1022 | int show_line_range(struct line_range *lr, const char *module, |
1023 | struct nsinfo *nsi, bool user) | |
ee45b6c2 MH |
1024 | { |
1025 | int ret; | |
544abd44 | 1026 | struct nscookie nsc; |
ee45b6c2 | 1027 | |
9bae1e8c | 1028 | ret = init_probe_symbol_maps(user); |
ee45b6c2 MH |
1029 | if (ret < 0) |
1030 | return ret; | |
544abd44 | 1031 | nsinfo__mountns_enter(nsi, &nsc); |
811dd2ae | 1032 | ret = __show_line_range(lr, module, user); |
544abd44 | 1033 | nsinfo__mountns_exit(&nsc); |
9bae1e8c | 1034 | exit_probe_symbol_maps(); |
ee45b6c2 MH |
1035 | |
1036 | return ret; | |
1037 | } | |
1038 | ||
ff741783 MH |
1039 | static int show_available_vars_at(struct debuginfo *dinfo, |
1040 | struct perf_probe_event *pev, | |
ddb2f58f | 1041 | struct strfilter *_filter) |
cf6eb489 MH |
1042 | { |
1043 | char *buf; | |
bd09d7b5 | 1044 | int ret, i, nvars; |
cf6eb489 MH |
1045 | struct str_node *node; |
1046 | struct variable_list *vls = NULL, *vl; | |
9b118aca | 1047 | struct perf_probe_point tmp; |
bd09d7b5 | 1048 | const char *var; |
cf6eb489 MH |
1049 | |
1050 | buf = synthesize_perf_probe_point(&pev->point); | |
1051 | if (!buf) | |
1052 | return -EINVAL; | |
1053 | pr_debug("Searching variables at %s\n", buf); | |
1054 | ||
ddb2f58f | 1055 | ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); |
9b118aca | 1056 | if (!ret) { /* Not found, retry with an alternative */ |
44225521 | 1057 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca MH |
1058 | if (!ret) { |
1059 | ret = debuginfo__find_available_vars_at(dinfo, pev, | |
ddb2f58f | 1060 | &vls); |
9b118aca MH |
1061 | /* Release the old probe_point */ |
1062 | clear_perf_probe_point(&tmp); | |
1063 | } | |
1064 | } | |
bd09d7b5 | 1065 | if (ret <= 0) { |
69e96eaa MH |
1066 | if (ret == 0 || ret == -ENOENT) { |
1067 | pr_err("Failed to find the address of %s\n", buf); | |
1068 | ret = -ENOENT; | |
1069 | } else | |
1070 | pr_warning("Debuginfo analysis failed.\n"); | |
bd09d7b5 MH |
1071 | goto end; |
1072 | } | |
69e96eaa | 1073 | |
bd09d7b5 MH |
1074 | /* Some variables are found */ |
1075 | fprintf(stdout, "Available variables at %s\n", buf); | |
1076 | for (i = 0; i < ret; i++) { | |
1077 | vl = &vls[i]; | |
1078 | /* | |
1079 | * A probe point might be converted to | |
1080 | * several trace points. | |
1081 | */ | |
1082 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
1083 | vl->point.offset); | |
74cf249d | 1084 | zfree(&vl->point.symbol); |
bd09d7b5 MH |
1085 | nvars = 0; |
1086 | if (vl->vars) { | |
602a1f4d | 1087 | strlist__for_each_entry(node, vl->vars) { |
bd09d7b5 MH |
1088 | var = strchr(node->s, '\t') + 1; |
1089 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 1090 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
1091 | nvars++; |
1092 | } | |
1093 | } | |
1094 | strlist__delete(vl->vars); | |
cf6eb489 | 1095 | } |
bd09d7b5 MH |
1096 | if (nvars == 0) |
1097 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
1098 | } | |
1099 | free(vls); | |
1100 | end: | |
cf6eb489 MH |
1101 | free(buf); |
1102 | return ret; | |
1103 | } | |
1104 | ||
1105 | /* Show available variables on given probe point */ | |
1106 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
ddb2f58f | 1107 | struct strfilter *_filter) |
cf6eb489 | 1108 | { |
ff741783 MH |
1109 | int i, ret = 0; |
1110 | struct debuginfo *dinfo; | |
cf6eb489 | 1111 | |
9bae1e8c | 1112 | ret = init_probe_symbol_maps(pevs->uprobes); |
cf6eb489 MH |
1113 | if (ret < 0) |
1114 | return ret; | |
1115 | ||
544abd44 | 1116 | dinfo = open_debuginfo(pevs->target, pevs->nsi, false); |
ff741783 | 1117 | if (!dinfo) { |
ee45b6c2 MH |
1118 | ret = -ENOENT; |
1119 | goto out; | |
ff741783 MH |
1120 | } |
1121 | ||
cf6eb489 MH |
1122 | setup_pager(); |
1123 | ||
ff741783 | 1124 | for (i = 0; i < npevs && ret >= 0; i++) |
ddb2f58f | 1125 | ret = show_available_vars_at(dinfo, &pevs[i], _filter); |
ff741783 MH |
1126 | |
1127 | debuginfo__delete(dinfo); | |
ee45b6c2 | 1128 | out: |
9bae1e8c | 1129 | exit_probe_symbol_maps(); |
cf6eb489 MH |
1130 | return ret; |
1131 | } | |
1132 | ||
89fe808a | 1133 | #else /* !HAVE_DWARF_SUPPORT */ |
4b4da7f7 | 1134 | |
7737af01 MH |
1135 | static void debuginfo_cache__exit(void) |
1136 | { | |
1137 | } | |
1138 | ||
5a6f6314 MH |
1139 | static int |
1140 | find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, | |
1141 | struct perf_probe_point *pp __maybe_unused, | |
1142 | bool is_kprobe __maybe_unused) | |
4b4da7f7 | 1143 | { |
5a6f6314 | 1144 | return -ENOSYS; |
4b4da7f7 MH |
1145 | } |
1146 | ||
0e60836b | 1147 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 1148 | struct probe_trace_event **tevs __maybe_unused) |
4b4da7f7 | 1149 | { |
146a1439 MH |
1150 | if (perf_probe_event_need_dwarf(pev)) { |
1151 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1152 | return -ENOSYS; | |
1153 | } | |
225466f1 | 1154 | |
4b4da7f7 MH |
1155 | return 0; |
1156 | } | |
1157 | ||
1d037ca1 | 1158 | int show_line_range(struct line_range *lr __maybe_unused, |
2b394bc4 | 1159 | const char *module __maybe_unused, |
544abd44 | 1160 | struct nsinfo *nsi __maybe_unused, |
2b394bc4 | 1161 | bool user __maybe_unused) |
4b4da7f7 | 1162 | { |
146a1439 MH |
1163 | pr_warning("Debuginfo-analysis is not supported.\n"); |
1164 | return -ENOSYS; | |
4b4da7f7 MH |
1165 | } |
1166 | ||
1d037ca1 | 1167 | int show_available_vars(struct perf_probe_event *pevs __maybe_unused, |
ddb2f58f MH |
1168 | int npevs __maybe_unused, |
1169 | struct strfilter *filter __maybe_unused) | |
cf6eb489 MH |
1170 | { |
1171 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1172 | return -ENOSYS; | |
1173 | } | |
e0faa8d3 MH |
1174 | #endif |
1175 | ||
e53b00d3 MH |
1176 | void line_range__clear(struct line_range *lr) |
1177 | { | |
e53b00d3 MH |
1178 | free(lr->function); |
1179 | free(lr->file); | |
1180 | free(lr->path); | |
1181 | free(lr->comp_dir); | |
5a62257a | 1182 | intlist__delete(lr->line_list); |
e53b00d3 MH |
1183 | memset(lr, 0, sizeof(*lr)); |
1184 | } | |
1185 | ||
5a62257a | 1186 | int line_range__init(struct line_range *lr) |
e53b00d3 MH |
1187 | { |
1188 | memset(lr, 0, sizeof(*lr)); | |
5a62257a MH |
1189 | lr->line_list = intlist__new(NULL); |
1190 | if (!lr->line_list) | |
1191 | return -ENOMEM; | |
1192 | else | |
1193 | return 0; | |
e53b00d3 MH |
1194 | } |
1195 | ||
21dd9ae5 FBH |
1196 | static int parse_line_num(char **ptr, int *val, const char *what) |
1197 | { | |
1198 | const char *start = *ptr; | |
1199 | ||
1200 | errno = 0; | |
1201 | *val = strtol(*ptr, ptr, 0); | |
1202 | if (errno || *ptr == start) { | |
1203 | semantic_error("'%s' is not a valid number.\n", what); | |
1204 | return -EINVAL; | |
1205 | } | |
1206 | return 0; | |
1207 | } | |
1208 | ||
573709fd MH |
1209 | /* Check the name is good for event, group or function */ |
1210 | static bool is_c_func_name(const char *name) | |
1211 | { | |
1212 | if (!isalpha(*name) && *name != '_') | |
1213 | return false; | |
1214 | while (*++name != '\0') { | |
1215 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1216 | return false; | |
1217 | } | |
1218 | return true; | |
1219 | } | |
1220 | ||
9d95b580 FBH |
1221 | /* |
1222 | * Stuff 'lr' according to the line range described by 'arg'. | |
1223 | * The line range syntax is described by: | |
1224 | * | |
1225 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 1226 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 1227 | */ |
146a1439 | 1228 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 1229 | { |
e116dfa1 | 1230 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
1231 | int err; |
1232 | ||
1233 | if (!name) | |
1234 | return -ENOMEM; | |
1235 | ||
1236 | lr->start = 0; | |
1237 | lr->end = INT_MAX; | |
1238 | ||
1239 | range = strchr(name, ':'); | |
1240 | if (range) { | |
1241 | *range++ = '\0'; | |
1242 | ||
1243 | err = parse_line_num(&range, &lr->start, "start line"); | |
1244 | if (err) | |
1245 | goto err; | |
1246 | ||
1247 | if (*range == '+' || *range == '-') { | |
1248 | const char c = *range++; | |
1249 | ||
1250 | err = parse_line_num(&range, &lr->end, "end line"); | |
1251 | if (err) | |
1252 | goto err; | |
1253 | ||
1254 | if (c == '+') { | |
1255 | lr->end += lr->start; | |
1256 | /* | |
1257 | * Adjust the number of lines here. | |
1258 | * If the number of lines == 1, the | |
1259 | * the end of line should be equal to | |
1260 | * the start of line. | |
1261 | */ | |
1262 | lr->end--; | |
1263 | } | |
1264 | } | |
9d95b580 | 1265 | |
d3b63d7a | 1266 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
1267 | |
1268 | err = -EINVAL; | |
d3b63d7a | 1269 | if (lr->start > lr->end) { |
631c9def | 1270 | semantic_error("Start line must be smaller" |
146a1439 | 1271 | " than end line.\n"); |
21dd9ae5 | 1272 | goto err; |
146a1439 | 1273 | } |
21dd9ae5 FBH |
1274 | if (*range != '\0') { |
1275 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
1276 | goto err; | |
146a1439 | 1277 | } |
d3b63d7a | 1278 | } |
02b95dad | 1279 | |
e116dfa1 MH |
1280 | file = strchr(name, '@'); |
1281 | if (file) { | |
1282 | *file = '\0'; | |
1283 | lr->file = strdup(++file); | |
1284 | if (lr->file == NULL) { | |
1285 | err = -ENOMEM; | |
1286 | goto err; | |
1287 | } | |
1288 | lr->function = name; | |
573709fd | 1289 | } else if (strchr(name, '/') || strchr(name, '.')) |
21dd9ae5 | 1290 | lr->file = name; |
573709fd | 1291 | else if (is_c_func_name(name))/* We reuse it for checking funcname */ |
21dd9ae5 | 1292 | lr->function = name; |
573709fd MH |
1293 | else { /* Invalid name */ |
1294 | semantic_error("'%s' is not a valid function name.\n", name); | |
1295 | err = -EINVAL; | |
1296 | goto err; | |
1297 | } | |
146a1439 MH |
1298 | |
1299 | return 0; | |
21dd9ae5 FBH |
1300 | err: |
1301 | free(name); | |
1302 | return err; | |
631c9def MH |
1303 | } |
1304 | ||
36a009fe MH |
1305 | static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev) |
1306 | { | |
1307 | char *ptr; | |
1308 | ||
c588d158 | 1309 | ptr = strpbrk_esc(*arg, ":"); |
36a009fe MH |
1310 | if (ptr) { |
1311 | *ptr = '\0'; | |
42bba263 | 1312 | if (!pev->sdt && !is_c_func_name(*arg)) |
36a009fe | 1313 | goto ng_name; |
c588d158 | 1314 | pev->group = strdup_esc(*arg); |
36a009fe MH |
1315 | if (!pev->group) |
1316 | return -ENOMEM; | |
1317 | *arg = ptr + 1; | |
1318 | } else | |
1319 | pev->group = NULL; | |
c588d158 MH |
1320 | |
1321 | pev->event = strdup_esc(*arg); | |
1322 | if (pev->event == NULL) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | if (!pev->sdt && !is_c_func_name(pev->event)) { | |
1326 | zfree(&pev->event); | |
36a009fe | 1327 | ng_name: |
c588d158 | 1328 | zfree(&pev->group); |
36a009fe MH |
1329 | semantic_error("%s is bad for event name -it must " |
1330 | "follow C symbol-naming rule.\n", *arg); | |
1331 | return -EINVAL; | |
1332 | } | |
36a009fe MH |
1333 | return 0; |
1334 | } | |
1335 | ||
50656eec | 1336 | /* Parse probepoint definition. */ |
146a1439 | 1337 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 1338 | { |
4235b045 | 1339 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
1340 | char *ptr, *tmp; |
1341 | char c, nc = 0; | |
3099c026 | 1342 | bool file_spec = false; |
36a009fe MH |
1343 | int ret; |
1344 | ||
50656eec MH |
1345 | /* |
1346 | * <Syntax> | |
8d993d96 MH |
1347 | * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] |
1348 | * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
36a009fe | 1349 | * perf probe %[GRP:]SDT_EVENT |
50656eec | 1350 | */ |
e59d29e8 WN |
1351 | if (!arg) |
1352 | return -EINVAL; | |
50656eec | 1353 | |
af9100ad | 1354 | if (is_sdt_event(arg)) { |
36a009fe | 1355 | pev->sdt = true; |
7e9fca51 MH |
1356 | if (arg[0] == '%') |
1357 | arg++; | |
36a009fe MH |
1358 | } |
1359 | ||
c588d158 | 1360 | ptr = strpbrk_esc(arg, ";=@+%"); |
36a009fe | 1361 | if (pev->sdt) { |
8d993d96 | 1362 | if (ptr) { |
a598180a MH |
1363 | if (*ptr != '@') { |
1364 | semantic_error("%s must be an SDT name.\n", | |
1365 | arg); | |
1366 | return -EINVAL; | |
1367 | } | |
1368 | /* This must be a target file name or build id */ | |
1369 | tmp = build_id_cache__complement(ptr + 1); | |
1370 | if (tmp) { | |
1371 | pev->target = build_id_cache__origname(tmp); | |
1372 | free(tmp); | |
1373 | } else | |
c588d158 | 1374 | pev->target = strdup_esc(ptr + 1); |
a598180a MH |
1375 | if (!pev->target) |
1376 | return -ENOMEM; | |
1377 | *ptr = '\0'; | |
146a1439 | 1378 | } |
36a009fe MH |
1379 | ret = parse_perf_probe_event_name(&arg, pev); |
1380 | if (ret == 0) { | |
1381 | if (asprintf(&pev->point.function, "%%%s", pev->event) < 0) | |
1382 | ret = -errno; | |
1383 | } | |
1384 | return ret; | |
1385 | } | |
1386 | ||
1387 | if (ptr && *ptr == '=') { /* Event name */ | |
1388 | *ptr = '\0'; | |
1389 | tmp = ptr + 1; | |
1390 | ret = parse_perf_probe_event_name(&arg, pev); | |
1391 | if (ret < 0) | |
1392 | return ret; | |
1393 | ||
af663d75 MH |
1394 | arg = tmp; |
1395 | } | |
1396 | ||
3099c026 NR |
1397 | /* |
1398 | * Check arg is function or file name and copy it. | |
1399 | * | |
1400 | * We consider arg to be a file spec if and only if it satisfies | |
1401 | * all of the below criteria:: | |
1402 | * - it does not include any of "+@%", | |
1403 | * - it includes one of ":;", and | |
1404 | * - it has a period '.' in the name. | |
1405 | * | |
1406 | * Otherwise, we consider arg to be a function specification. | |
1407 | */ | |
c588d158 MH |
1408 | if (!strpbrk_esc(arg, "+@%")) { |
1409 | ptr = strpbrk_esc(arg, ";:"); | |
3099c026 | 1410 | /* This is a file spec if it includes a '.' before ; or : */ |
c588d158 | 1411 | if (ptr && memchr(arg, '.', ptr - arg)) |
3099c026 NR |
1412 | file_spec = true; |
1413 | } | |
1414 | ||
c588d158 | 1415 | ptr = strpbrk_esc(arg, ";:+@%"); |
50656eec MH |
1416 | if (ptr) { |
1417 | nc = *ptr; | |
1418 | *ptr++ = '\0'; | |
1419 | } | |
1420 | ||
6c6e024f WN |
1421 | if (arg[0] == '\0') |
1422 | tmp = NULL; | |
1423 | else { | |
c588d158 | 1424 | tmp = strdup_esc(arg); |
6c6e024f WN |
1425 | if (tmp == NULL) |
1426 | return -ENOMEM; | |
1427 | } | |
02b95dad | 1428 | |
3099c026 | 1429 | if (file_spec) |
02b95dad | 1430 | pp->file = tmp; |
da15bd9d | 1431 | else { |
02b95dad | 1432 | pp->function = tmp; |
50656eec | 1433 | |
da15bd9d WN |
1434 | /* |
1435 | * Keep pp->function even if this is absolute address, | |
1436 | * so it can mark whether abs_address is valid. | |
1437 | * Which make 'perf probe lib.bin 0x0' possible. | |
1438 | * | |
1439 | * Note that checking length of tmp is not needed | |
1440 | * because when we access tmp[1] we know tmp[0] is '0', | |
1441 | * so tmp[1] should always valid (but could be '\0'). | |
1442 | */ | |
1443 | if (tmp && !strncmp(tmp, "0x", 2)) { | |
1444 | pp->abs_address = strtoul(pp->function, &tmp, 0); | |
1445 | if (*tmp != '\0') { | |
1446 | semantic_error("Invalid absolute address.\n"); | |
1447 | return -EINVAL; | |
1448 | } | |
1449 | } | |
1450 | } | |
1451 | ||
50656eec MH |
1452 | /* Parse other options */ |
1453 | while (ptr) { | |
1454 | arg = ptr; | |
1455 | c = nc; | |
2a9c8c36 | 1456 | if (c == ';') { /* Lazy pattern must be the last part */ |
c588d158 | 1457 | pp->lazy_line = strdup(arg); /* let leave escapes */ |
02b95dad MH |
1458 | if (pp->lazy_line == NULL) |
1459 | return -ENOMEM; | |
2a9c8c36 MH |
1460 | break; |
1461 | } | |
c588d158 | 1462 | ptr = strpbrk_esc(arg, ";:+@%"); |
50656eec MH |
1463 | if (ptr) { |
1464 | nc = *ptr; | |
1465 | *ptr++ = '\0'; | |
1466 | } | |
1467 | switch (c) { | |
1468 | case ':': /* Line number */ | |
1469 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 1470 | if (*tmp != '\0') { |
2a9c8c36 | 1471 | semantic_error("There is non-digit char" |
146a1439 MH |
1472 | " in line number.\n"); |
1473 | return -EINVAL; | |
1474 | } | |
50656eec MH |
1475 | break; |
1476 | case '+': /* Byte offset from a symbol */ | |
1477 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 1478 | if (*tmp != '\0') { |
2a9c8c36 | 1479 | semantic_error("There is non-digit character" |
146a1439 MH |
1480 | " in offset.\n"); |
1481 | return -EINVAL; | |
1482 | } | |
50656eec MH |
1483 | break; |
1484 | case '@': /* File name */ | |
146a1439 MH |
1485 | if (pp->file) { |
1486 | semantic_error("SRC@SRC is not allowed.\n"); | |
1487 | return -EINVAL; | |
1488 | } | |
c588d158 | 1489 | pp->file = strdup_esc(arg); |
02b95dad MH |
1490 | if (pp->file == NULL) |
1491 | return -ENOMEM; | |
50656eec MH |
1492 | break; |
1493 | case '%': /* Probe places */ | |
1494 | if (strcmp(arg, "return") == 0) { | |
1495 | pp->retprobe = 1; | |
146a1439 MH |
1496 | } else { /* Others not supported yet */ |
1497 | semantic_error("%%%s is not supported.\n", arg); | |
1498 | return -ENOTSUP; | |
1499 | } | |
50656eec | 1500 | break; |
146a1439 MH |
1501 | default: /* Buggy case */ |
1502 | pr_err("This program has a bug at %s:%d.\n", | |
1503 | __FILE__, __LINE__); | |
1504 | return -ENOTSUP; | |
50656eec MH |
1505 | break; |
1506 | } | |
1507 | } | |
1508 | ||
1509 | /* Exclusion check */ | |
146a1439 | 1510 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
1511 | semantic_error("Lazy pattern can't be used with" |
1512 | " line number.\n"); | |
146a1439 MH |
1513 | return -EINVAL; |
1514 | } | |
2a9c8c36 | 1515 | |
146a1439 | 1516 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 1517 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
1518 | return -EINVAL; |
1519 | } | |
2a9c8c36 | 1520 | |
146a1439 | 1521 | if (pp->line && pp->offset) { |
0e43e5d2 | 1522 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
1523 | return -EINVAL; |
1524 | } | |
50656eec | 1525 | |
146a1439 | 1526 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 1527 | semantic_error("File always requires line number or " |
0e43e5d2 | 1528 | "lazy pattern.\n"); |
146a1439 MH |
1529 | return -EINVAL; |
1530 | } | |
50656eec | 1531 | |
146a1439 | 1532 | if (pp->offset && !pp->function) { |
0e43e5d2 | 1533 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
1534 | return -EINVAL; |
1535 | } | |
50656eec | 1536 | |
146a1439 | 1537 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 1538 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 1539 | "return probe.\n"); |
146a1439 MH |
1540 | return -EINVAL; |
1541 | } | |
50656eec | 1542 | |
4235b045 | 1543 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
1544 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
1545 | pp->lazy_line); | |
146a1439 | 1546 | return 0; |
50656eec MH |
1547 | } |
1548 | ||
7df2f329 | 1549 | /* Parse perf-probe event argument */ |
146a1439 | 1550 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 1551 | { |
b2a3c12b | 1552 | char *tmp, *goodname; |
7df2f329 MH |
1553 | struct perf_probe_arg_field **fieldp; |
1554 | ||
1555 | pr_debug("parsing arg: %s into ", str); | |
1556 | ||
48481938 MH |
1557 | tmp = strchr(str, '='); |
1558 | if (tmp) { | |
02b95dad MH |
1559 | arg->name = strndup(str, tmp - str); |
1560 | if (arg->name == NULL) | |
1561 | return -ENOMEM; | |
11a1ca35 | 1562 | pr_debug("name:%s ", arg->name); |
48481938 MH |
1563 | str = tmp + 1; |
1564 | } | |
1565 | ||
11a1ca35 MH |
1566 | tmp = strchr(str, ':'); |
1567 | if (tmp) { /* Type setting */ | |
1568 | *tmp = '\0'; | |
02b95dad MH |
1569 | arg->type = strdup(tmp + 1); |
1570 | if (arg->type == NULL) | |
1571 | return -ENOMEM; | |
11a1ca35 MH |
1572 | pr_debug("type:%s ", arg->type); |
1573 | } | |
1574 | ||
b2a3c12b | 1575 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
1576 | if (!is_c_varname(str) || !tmp) { |
1577 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
1578 | arg->var = strdup(str); |
1579 | if (arg->var == NULL) | |
1580 | return -ENOMEM; | |
48481938 | 1581 | pr_debug("%s\n", arg->var); |
146a1439 | 1582 | return 0; |
7df2f329 MH |
1583 | } |
1584 | ||
b2a3c12b | 1585 | /* Structure fields or array element */ |
02b95dad MH |
1586 | arg->var = strndup(str, tmp - str); |
1587 | if (arg->var == NULL) | |
1588 | return -ENOMEM; | |
b2a3c12b | 1589 | goodname = arg->var; |
48481938 | 1590 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
1591 | fieldp = &arg->field; |
1592 | ||
1593 | do { | |
e334016f MH |
1594 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
1595 | if (*fieldp == NULL) | |
1596 | return -ENOMEM; | |
b2a3c12b MH |
1597 | if (*tmp == '[') { /* Array */ |
1598 | str = tmp; | |
1599 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 1600 | (*fieldp)->ref = true; |
b2a3c12b MH |
1601 | if (*tmp != ']' || tmp == str + 1) { |
1602 | semantic_error("Array index must be a" | |
1603 | " number.\n"); | |
1604 | return -EINVAL; | |
1605 | } | |
1606 | tmp++; | |
1607 | if (*tmp == '\0') | |
1608 | tmp = NULL; | |
1609 | } else { /* Structure */ | |
1610 | if (*tmp == '.') { | |
1611 | str = tmp + 1; | |
1612 | (*fieldp)->ref = false; | |
1613 | } else if (tmp[1] == '>') { | |
1614 | str = tmp + 2; | |
1615 | (*fieldp)->ref = true; | |
1616 | } else { | |
1617 | semantic_error("Argument parse error: %s\n", | |
1618 | str); | |
1619 | return -EINVAL; | |
1620 | } | |
1621 | tmp = strpbrk(str, "-.["); | |
146a1439 | 1622 | } |
7df2f329 | 1623 | if (tmp) { |
02b95dad MH |
1624 | (*fieldp)->name = strndup(str, tmp - str); |
1625 | if ((*fieldp)->name == NULL) | |
1626 | return -ENOMEM; | |
b2a3c12b MH |
1627 | if (*str != '[') |
1628 | goodname = (*fieldp)->name; | |
7df2f329 MH |
1629 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
1630 | fieldp = &(*fieldp)->next; | |
1631 | } | |
1632 | } while (tmp); | |
02b95dad MH |
1633 | (*fieldp)->name = strdup(str); |
1634 | if ((*fieldp)->name == NULL) | |
1635 | return -ENOMEM; | |
b2a3c12b MH |
1636 | if (*str != '[') |
1637 | goodname = (*fieldp)->name; | |
7df2f329 | 1638 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 1639 | |
b2a3c12b | 1640 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 1641 | if (!arg->name) { |
b2a3c12b | 1642 | arg->name = strdup(goodname); |
02b95dad MH |
1643 | if (arg->name == NULL) |
1644 | return -ENOMEM; | |
1645 | } | |
146a1439 | 1646 | return 0; |
7df2f329 MH |
1647 | } |
1648 | ||
4235b045 | 1649 | /* Parse perf-probe event command */ |
146a1439 | 1650 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 1651 | { |
e1c01d61 | 1652 | char **argv; |
146a1439 | 1653 | int argc, i, ret = 0; |
fac13fd5 | 1654 | |
4235b045 | 1655 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1656 | if (!argv) { |
1657 | pr_debug("Failed to split arguments.\n"); | |
1658 | return -ENOMEM; | |
1659 | } | |
1660 | if (argc - 1 > MAX_PROBE_ARGS) { | |
1661 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
1662 | ret = -ERANGE; | |
1663 | goto out; | |
1664 | } | |
50656eec | 1665 | /* Parse probe point */ |
146a1439 MH |
1666 | ret = parse_perf_probe_point(argv[0], pev); |
1667 | if (ret < 0) | |
1668 | goto out; | |
50656eec | 1669 | |
e1c01d61 | 1670 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 1671 | pev->nargs = argc - 1; |
e334016f MH |
1672 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1673 | if (pev->args == NULL) { | |
1674 | ret = -ENOMEM; | |
1675 | goto out; | |
1676 | } | |
146a1439 MH |
1677 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
1678 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
1679 | if (ret >= 0 && | |
1680 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 1681 | semantic_error("You can't specify local variable for" |
146a1439 MH |
1682 | " kretprobe.\n"); |
1683 | ret = -EINVAL; | |
1684 | } | |
e1c01d61 | 1685 | } |
146a1439 | 1686 | out: |
e1c01d61 | 1687 | argv_free(argv); |
146a1439 MH |
1688 | |
1689 | return ret; | |
50656eec MH |
1690 | } |
1691 | ||
b3f33f93 RB |
1692 | /* Returns true if *any* ARG is either C variable, $params or $vars. */ |
1693 | bool perf_probe_with_var(struct perf_probe_event *pev) | |
1694 | { | |
1695 | int i = 0; | |
1696 | ||
1697 | for (i = 0; i < pev->nargs; i++) | |
1698 | if (is_c_varname(pev->args[i].var) || | |
1699 | !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) || | |
1700 | !strcmp(pev->args[i].var, PROBE_ARG_VARS)) | |
1701 | return true; | |
1702 | return false; | |
1703 | } | |
1704 | ||
4235b045 MH |
1705 | /* Return true if this perf_probe_event requires debuginfo */ |
1706 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
1707 | { | |
4235b045 MH |
1708 | if (pev->point.file || pev->point.line || pev->point.lazy_line) |
1709 | return true; | |
1710 | ||
b3f33f93 RB |
1711 | if (perf_probe_with_var(pev)) |
1712 | return true; | |
4235b045 MH |
1713 | |
1714 | return false; | |
1715 | } | |
1716 | ||
0e60836b | 1717 | /* Parse probe_events event into struct probe_point */ |
92f6c72e | 1718 | int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) |
4de189fe | 1719 | { |
0e60836b | 1720 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
1721 | char pr; |
1722 | char *p; | |
bcbd0040 | 1723 | char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; |
4de189fe MH |
1724 | int ret, i, argc; |
1725 | char **argv; | |
1726 | ||
0e60836b | 1727 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1728 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1729 | if (!argv) { |
1730 | pr_debug("Failed to split arguments.\n"); | |
1731 | return -ENOMEM; | |
1732 | } | |
1733 | if (argc < 2) { | |
1734 | semantic_error("Too few probe arguments.\n"); | |
1735 | ret = -ERANGE; | |
1736 | goto out; | |
1737 | } | |
4de189fe MH |
1738 | |
1739 | /* Scan event and group name. */ | |
bcbd0040 IT |
1740 | argv0_str = strdup(argv[0]); |
1741 | if (argv0_str == NULL) { | |
1742 | ret = -ENOMEM; | |
1743 | goto out; | |
1744 | } | |
1745 | fmt1_str = strtok_r(argv0_str, ":", &fmt); | |
1746 | fmt2_str = strtok_r(NULL, "/", &fmt); | |
1747 | fmt3_str = strtok_r(NULL, " \t", &fmt); | |
1748 | if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL | |
1749 | || fmt3_str == NULL) { | |
146a1439 MH |
1750 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1751 | ret = -EINVAL; | |
1752 | goto out; | |
1753 | } | |
bcbd0040 IT |
1754 | pr = fmt1_str[0]; |
1755 | tev->group = strdup(fmt2_str); | |
1756 | tev->event = strdup(fmt3_str); | |
1757 | if (tev->group == NULL || tev->event == NULL) { | |
1758 | ret = -ENOMEM; | |
1759 | goto out; | |
1760 | } | |
4235b045 | 1761 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1762 | |
4235b045 | 1763 | tp->retprobe = (pr == 'r'); |
4de189fe | 1764 | |
190b57fc MH |
1765 | /* Scan module name(if there), function name and offset */ |
1766 | p = strchr(argv[1], ':'); | |
1767 | if (p) { | |
1768 | tp->module = strndup(argv[1], p - argv[1]); | |
844faa4b MH |
1769 | if (!tp->module) { |
1770 | ret = -ENOMEM; | |
1771 | goto out; | |
1772 | } | |
42bba263 | 1773 | tev->uprobes = (tp->module[0] == '/'); |
190b57fc MH |
1774 | p++; |
1775 | } else | |
1776 | p = argv[1]; | |
bcbd0040 | 1777 | fmt1_str = strtok_r(p, "+", &fmt); |
be07afe9 WN |
1778 | /* only the address started with 0x */ |
1779 | if (fmt1_str[0] == '0') { | |
1780 | /* | |
1781 | * Fix a special case: | |
1782 | * if address == 0, kernel reports something like: | |
1783 | * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax | |
1784 | * Newer kernel may fix that, but we want to | |
1785 | * support old kernel also. | |
1786 | */ | |
1787 | if (strcmp(fmt1_str, "0x") == 0) { | |
1788 | if (!argv[2] || strcmp(argv[2], "(null)")) { | |
1789 | ret = -EINVAL; | |
1790 | goto out; | |
1791 | } | |
1792 | tp->address = 0; | |
1793 | ||
1794 | free(argv[2]); | |
1795 | for (i = 2; argv[i + 1] != NULL; i++) | |
1796 | argv[i] = argv[i + 1]; | |
1797 | ||
1798 | argv[i] = NULL; | |
1799 | argc -= 1; | |
1800 | } else | |
1801 | tp->address = strtoul(fmt1_str, NULL, 0); | |
1802 | } else { | |
5a6f6314 MH |
1803 | /* Only the symbol-based probe has offset */ |
1804 | tp->symbol = strdup(fmt1_str); | |
1805 | if (tp->symbol == NULL) { | |
1806 | ret = -ENOMEM; | |
1807 | goto out; | |
1808 | } | |
1809 | fmt2_str = strtok_r(NULL, "", &fmt); | |
1810 | if (fmt2_str == NULL) | |
1811 | tp->offset = 0; | |
1812 | else | |
1813 | tp->offset = strtoul(fmt2_str, NULL, 10); | |
bcbd0040 | 1814 | } |
4de189fe | 1815 | |
5a5e3d3c RB |
1816 | if (tev->uprobes) { |
1817 | fmt2_str = strchr(p, '('); | |
1818 | if (fmt2_str) | |
1819 | tp->ref_ctr_offset = strtoul(fmt2_str + 1, NULL, 0); | |
1820 | } | |
1821 | ||
4235b045 | 1822 | tev->nargs = argc - 2; |
0e60836b | 1823 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1824 | if (tev->args == NULL) { |
1825 | ret = -ENOMEM; | |
1826 | goto out; | |
1827 | } | |
4235b045 | 1828 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1829 | p = strchr(argv[i + 2], '='); |
1830 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1831 | *p++ = '\0'; |
1832 | else | |
1833 | p = argv[i + 2]; | |
02b95dad | 1834 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1835 | /* TODO: parse regs and offset */ |
02b95dad MH |
1836 | tev->args[i].value = strdup(p); |
1837 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1838 | ret = -ENOMEM; | |
1839 | goto out; | |
1840 | } | |
4de189fe | 1841 | } |
146a1439 MH |
1842 | ret = 0; |
1843 | out: | |
bcbd0040 | 1844 | free(argv0_str); |
4de189fe | 1845 | argv_free(argv); |
146a1439 | 1846 | return ret; |
4de189fe MH |
1847 | } |
1848 | ||
7df2f329 | 1849 | /* Compose only probe arg */ |
909b0360 | 1850 | char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) |
7df2f329 MH |
1851 | { |
1852 | struct perf_probe_arg_field *field = pa->field; | |
909b0360 | 1853 | struct strbuf buf; |
bf4d5f25 MH |
1854 | char *ret = NULL; |
1855 | int err; | |
1856 | ||
1857 | if (strbuf_init(&buf, 64) < 0) | |
1858 | return NULL; | |
7df2f329 | 1859 | |
48481938 | 1860 | if (pa->name && pa->var) |
bf4d5f25 | 1861 | err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); |
48481938 | 1862 | else |
bf4d5f25 MH |
1863 | err = strbuf_addstr(&buf, pa->name ?: pa->var); |
1864 | if (err) | |
1865 | goto out; | |
7df2f329 MH |
1866 | |
1867 | while (field) { | |
b2a3c12b | 1868 | if (field->name[0] == '[') |
bf4d5f25 | 1869 | err = strbuf_addstr(&buf, field->name); |
b2a3c12b | 1870 | else |
bf4d5f25 MH |
1871 | err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", |
1872 | field->name); | |
7df2f329 | 1873 | field = field->next; |
bf4d5f25 MH |
1874 | if (err) |
1875 | goto out; | |
7df2f329 | 1876 | } |
11a1ca35 | 1877 | |
909b0360 | 1878 | if (pa->type) |
bf4d5f25 MH |
1879 | if (strbuf_addf(&buf, ":%s", pa->type) < 0) |
1880 | goto out; | |
909b0360 MH |
1881 | |
1882 | ret = strbuf_detach(&buf, NULL); | |
bf4d5f25 MH |
1883 | out: |
1884 | strbuf_release(&buf); | |
146a1439 | 1885 | return ret; |
7df2f329 MH |
1886 | } |
1887 | ||
4235b045 | 1888 | /* Compose only probe point (not argument) */ |
c4ff4920 | 1889 | char *synthesize_perf_probe_point(struct perf_probe_point *pp) |
4de189fe | 1890 | { |
909b0360 | 1891 | struct strbuf buf; |
bf4d5f25 MH |
1892 | char *tmp, *ret = NULL; |
1893 | int len, err = 0; | |
1894 | ||
1895 | if (strbuf_init(&buf, 64) < 0) | |
1896 | return NULL; | |
909b0360 | 1897 | |
909b0360 | 1898 | if (pp->function) { |
bf4d5f25 MH |
1899 | if (strbuf_addstr(&buf, pp->function) < 0) |
1900 | goto out; | |
909b0360 | 1901 | if (pp->offset) |
bf4d5f25 | 1902 | err = strbuf_addf(&buf, "+%lu", pp->offset); |
909b0360 | 1903 | else if (pp->line) |
bf4d5f25 | 1904 | err = strbuf_addf(&buf, ":%d", pp->line); |
909b0360 | 1905 | else if (pp->retprobe) |
bf4d5f25 MH |
1906 | err = strbuf_addstr(&buf, "%return"); |
1907 | if (err) | |
1908 | goto out; | |
fb1587d8 MH |
1909 | } |
1910 | if (pp->file) { | |
32ae2ade FBH |
1911 | tmp = pp->file; |
1912 | len = strlen(tmp); | |
1913 | if (len > 30) { | |
1914 | tmp = strchr(pp->file + len - 30, '/'); | |
1915 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1916 | } | |
bf4d5f25 MH |
1917 | err = strbuf_addf(&buf, "@%s", tmp); |
1918 | if (!err && !pp->function && pp->line) | |
1919 | err = strbuf_addf(&buf, ":%d", pp->line); | |
4de189fe | 1920 | } |
bf4d5f25 MH |
1921 | if (!err) |
1922 | ret = strbuf_detach(&buf, NULL); | |
1923 | out: | |
1924 | strbuf_release(&buf); | |
1925 | return ret; | |
7ef17aaf MH |
1926 | } |
1927 | ||
4235b045 | 1928 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) |
7ef17aaf | 1929 | { |
c4ff4920 MH |
1930 | struct strbuf buf; |
1931 | char *tmp, *ret = NULL; | |
1932 | int i; | |
7ef17aaf | 1933 | |
c4ff4920 | 1934 | if (strbuf_init(&buf, 64)) |
4235b045 | 1935 | return NULL; |
c4ff4920 MH |
1936 | if (pev->event) |
1937 | if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, | |
1938 | pev->event) < 0) | |
1939 | goto out; | |
1940 | ||
1941 | tmp = synthesize_perf_probe_point(&pev->point); | |
1942 | if (!tmp || strbuf_addstr(&buf, tmp) < 0) | |
1943 | goto out; | |
1944 | free(tmp); | |
4de189fe | 1945 | |
4235b045 | 1946 | for (i = 0; i < pev->nargs; i++) { |
c4ff4920 MH |
1947 | tmp = synthesize_perf_probe_arg(pev->args + i); |
1948 | if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) | |
1949 | goto out; | |
1950 | free(tmp); | |
4de189fe | 1951 | } |
4de189fe | 1952 | |
c4ff4920 MH |
1953 | ret = strbuf_detach(&buf, NULL); |
1954 | out: | |
1955 | strbuf_release(&buf); | |
1956 | return ret; | |
4235b045 | 1957 | } |
4235b045 | 1958 | |
0e60836b | 1959 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
909b0360 | 1960 | struct strbuf *buf, int depth) |
4235b045 | 1961 | { |
bf4d5f25 | 1962 | int err; |
4235b045 | 1963 | if (ref->next) { |
0e60836b | 1964 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
909b0360 | 1965 | depth + 1); |
4235b045 | 1966 | if (depth < 0) |
bf4d5f25 | 1967 | return depth; |
4235b045 | 1968 | } |
bf4d5f25 MH |
1969 | err = strbuf_addf(buf, "%+ld(", ref->offset); |
1970 | return (err < 0) ? err : depth; | |
4de189fe MH |
1971 | } |
1972 | ||
0e60836b | 1973 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
909b0360 | 1974 | struct strbuf *buf) |
50656eec | 1975 | { |
0e60836b | 1976 | struct probe_trace_arg_ref *ref = arg->ref; |
bf4d5f25 | 1977 | int depth = 0, err; |
4235b045 MH |
1978 | |
1979 | /* Argument name or separator */ | |
1980 | if (arg->name) | |
bf4d5f25 | 1981 | err = strbuf_addf(buf, " %s=", arg->name); |
4235b045 | 1982 | else |
bf4d5f25 MH |
1983 | err = strbuf_addch(buf, ' '); |
1984 | if (err) | |
1985 | return err; | |
4235b045 | 1986 | |
b7dcb857 MH |
1987 | /* Special case: @XXX */ |
1988 | if (arg->value[0] == '@' && arg->ref) | |
1989 | ref = ref->next; | |
1990 | ||
4235b045 | 1991 | /* Dereferencing arguments */ |
b7dcb857 | 1992 | if (ref) { |
909b0360 | 1993 | depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); |
4235b045 MH |
1994 | if (depth < 0) |
1995 | return depth; | |
1996 | } | |
1997 | ||
1998 | /* Print argument value */ | |
b7dcb857 | 1999 | if (arg->value[0] == '@' && arg->ref) |
bf4d5f25 | 2000 | err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); |
b7dcb857 | 2001 | else |
bf4d5f25 | 2002 | err = strbuf_addstr(buf, arg->value); |
4235b045 MH |
2003 | |
2004 | /* Closing */ | |
bf4d5f25 MH |
2005 | while (!err && depth--) |
2006 | err = strbuf_addch(buf, ')'); | |
2007 | ||
4984912e | 2008 | /* Print argument type */ |
bf4d5f25 MH |
2009 | if (!err && arg->type) |
2010 | err = strbuf_addf(buf, ":%s", arg->type); | |
4235b045 | 2011 | |
bf4d5f25 | 2012 | return err; |
4235b045 MH |
2013 | } |
2014 | ||
5a5e3d3c RB |
2015 | static int |
2016 | synthesize_uprobe_trace_def(struct probe_trace_event *tev, struct strbuf *buf) | |
2017 | { | |
2018 | struct probe_trace_point *tp = &tev->point; | |
2019 | int err; | |
2020 | ||
2021 | err = strbuf_addf(buf, "%s:0x%lx", tp->module, tp->address); | |
2022 | ||
2023 | if (err >= 0 && tp->ref_ctr_offset) { | |
2024 | if (!uprobe_ref_ctr_is_supported()) | |
2025 | return -1; | |
2026 | err = strbuf_addf(buf, "(0x%lx)", tp->ref_ctr_offset); | |
2027 | } | |
2028 | return err >= 0 ? 0 : -1; | |
2029 | } | |
2030 | ||
0e60836b | 2031 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 2032 | { |
0e60836b | 2033 | struct probe_trace_point *tp = &tev->point; |
909b0360 MH |
2034 | struct strbuf buf; |
2035 | char *ret = NULL; | |
bf4d5f25 | 2036 | int i, err; |
eb948e50 | 2037 | |
da15bd9d WN |
2038 | /* Uprobes must have tp->module */ |
2039 | if (tev->uprobes && !tp->module) | |
909b0360 MH |
2040 | return NULL; |
2041 | ||
bf4d5f25 MH |
2042 | if (strbuf_init(&buf, 32) < 0) |
2043 | return NULL; | |
2044 | ||
2045 | if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', | |
2046 | tev->group, tev->event) < 0) | |
2047 | goto error; | |
da15bd9d WN |
2048 | /* |
2049 | * If tp->address == 0, then this point must be a | |
2050 | * absolute address uprobe. | |
2051 | * try_to_find_absolute_address() should have made | |
2052 | * tp->symbol to "0x0". | |
2053 | */ | |
2054 | if (tev->uprobes && !tp->address) { | |
2055 | if (!tp->symbol || strcmp(tp->symbol, "0x0")) | |
2056 | goto error; | |
2057 | } | |
eb948e50 MH |
2058 | |
2059 | /* Use the tp->address for uprobes */ | |
5a5e3d3c RB |
2060 | if (tev->uprobes) { |
2061 | err = synthesize_uprobe_trace_def(tev, &buf); | |
2062 | } else if (!strncmp(tp->symbol, "0x", 2)) { | |
da15bd9d | 2063 | /* Absolute address. See try_to_find_absolute_address() */ |
bf4d5f25 MH |
2064 | err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", |
2065 | tp->module ? ":" : "", tp->address); | |
5a5e3d3c | 2066 | } else { |
bf4d5f25 MH |
2067 | err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", |
2068 | tp->module ? ":" : "", tp->symbol, tp->offset); | |
5a5e3d3c RB |
2069 | } |
2070 | ||
bf4d5f25 MH |
2071 | if (err) |
2072 | goto error; | |
50656eec | 2073 | |
909b0360 MH |
2074 | for (i = 0; i < tev->nargs; i++) |
2075 | if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) | |
50656eec | 2076 | goto error; |
50656eec | 2077 | |
909b0360 | 2078 | ret = strbuf_detach(&buf, NULL); |
50656eec | 2079 | error: |
909b0360 MH |
2080 | strbuf_release(&buf); |
2081 | return ret; | |
4235b045 | 2082 | } |
50656eec | 2083 | |
5a6f6314 MH |
2084 | static int find_perf_probe_point_from_map(struct probe_trace_point *tp, |
2085 | struct perf_probe_point *pp, | |
2086 | bool is_kprobe) | |
2087 | { | |
2088 | struct symbol *sym = NULL; | |
8a2efd6d | 2089 | struct map *map = NULL; |
e486367f | 2090 | u64 addr = tp->address; |
5a6f6314 MH |
2091 | int ret = -ENOENT; |
2092 | ||
2093 | if (!is_kprobe) { | |
2094 | map = dso__new_map(tp->module); | |
2095 | if (!map) | |
2096 | goto out; | |
be39db9f | 2097 | sym = map__find_symbol(map, addr); |
5a6f6314 | 2098 | } else { |
9b239a12 | 2099 | if (tp->symbol && !addr) { |
0a62f686 MH |
2100 | if (kernel_get_symbol_address_by_name(tp->symbol, |
2101 | &addr, true, false) < 0) | |
9b239a12 MH |
2102 | goto out; |
2103 | } | |
5a6f6314 MH |
2104 | if (addr) { |
2105 | addr += tp->offset; | |
107cad95 | 2106 | sym = machine__find_kernel_symbol(host_machine, addr, &map); |
5a6f6314 MH |
2107 | } |
2108 | } | |
98d3b258 | 2109 | |
5a6f6314 MH |
2110 | if (!sym) |
2111 | goto out; | |
2112 | ||
2113 | pp->retprobe = tp->retprobe; | |
2114 | pp->offset = addr - map->unmap_ip(map, sym->start); | |
2115 | pp->function = strdup(sym->name); | |
2116 | ret = pp->function ? 0 : -ENOMEM; | |
2117 | ||
2118 | out: | |
2119 | if (map && !is_kprobe) { | |
84c2cafa | 2120 | map__put(map); |
5a6f6314 MH |
2121 | } |
2122 | ||
2123 | return ret; | |
2124 | } | |
2125 | ||
2126 | static int convert_to_perf_probe_point(struct probe_trace_point *tp, | |
da15bd9d WN |
2127 | struct perf_probe_point *pp, |
2128 | bool is_kprobe) | |
5a6f6314 MH |
2129 | { |
2130 | char buf[128]; | |
2131 | int ret; | |
2132 | ||
2133 | ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); | |
2134 | if (!ret) | |
2135 | return 0; | |
2136 | ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); | |
2137 | if (!ret) | |
2138 | return 0; | |
2139 | ||
2140 | pr_debug("Failed to find probe point from both of dwarf and map.\n"); | |
2141 | ||
2142 | if (tp->symbol) { | |
2143 | pp->function = strdup(tp->symbol); | |
2144 | pp->offset = tp->offset; | |
614e2fdb | 2145 | } else { |
5a6f6314 MH |
2146 | ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); |
2147 | if (ret < 0) | |
2148 | return ret; | |
2149 | pp->function = strdup(buf); | |
2150 | pp->offset = 0; | |
2151 | } | |
2152 | if (pp->function == NULL) | |
2153 | return -ENOMEM; | |
2154 | ||
2155 | pp->retprobe = tp->retprobe; | |
2156 | ||
2157 | return 0; | |
2158 | } | |
2159 | ||
0e60836b | 2160 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
225466f1 | 2161 | struct perf_probe_event *pev, bool is_kprobe) |
4235b045 | 2162 | { |
909b0360 | 2163 | struct strbuf buf = STRBUF_INIT; |
146a1439 | 2164 | int i, ret; |
4235b045 | 2165 | |
4b4da7f7 | 2166 | /* Convert event/group name */ |
02b95dad MH |
2167 | pev->event = strdup(tev->event); |
2168 | pev->group = strdup(tev->group); | |
2169 | if (pev->event == NULL || pev->group == NULL) | |
2170 | return -ENOMEM; | |
fb1587d8 | 2171 | |
4b4da7f7 | 2172 | /* Convert trace_point to probe_point */ |
5a6f6314 | 2173 | ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); |
146a1439 MH |
2174 | if (ret < 0) |
2175 | return ret; | |
4b4da7f7 | 2176 | |
4235b045 MH |
2177 | /* Convert trace_arg to probe_arg */ |
2178 | pev->nargs = tev->nargs; | |
e334016f MH |
2179 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
2180 | if (pev->args == NULL) | |
2181 | return -ENOMEM; | |
02b95dad | 2182 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 2183 | if (tev->args[i].name) |
02b95dad | 2184 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 2185 | else { |
bf4d5f25 MH |
2186 | if ((ret = strbuf_init(&buf, 32)) < 0) |
2187 | goto error; | |
909b0360 MH |
2188 | ret = synthesize_probe_trace_arg(&tev->args[i], &buf); |
2189 | pev->args[i].name = strbuf_detach(&buf, NULL); | |
4235b045 | 2190 | } |
02b95dad MH |
2191 | if (pev->args[i].name == NULL && ret >= 0) |
2192 | ret = -ENOMEM; | |
2193 | } | |
bf4d5f25 | 2194 | error: |
146a1439 MH |
2195 | if (ret < 0) |
2196 | clear_perf_probe_event(pev); | |
2197 | ||
2198 | return ret; | |
4235b045 MH |
2199 | } |
2200 | ||
2201 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
2202 | { | |
7df2f329 | 2203 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
2204 | int i; |
2205 | ||
f5385650 ACM |
2206 | free(pev->event); |
2207 | free(pev->group); | |
7afb3fab | 2208 | free(pev->target); |
9b118aca | 2209 | clear_perf_probe_point(&pev->point); |
f5385650 | 2210 | |
7df2f329 | 2211 | for (i = 0; i < pev->nargs; i++) { |
f5385650 ACM |
2212 | free(pev->args[i].name); |
2213 | free(pev->args[i].var); | |
2214 | free(pev->args[i].type); | |
7df2f329 MH |
2215 | field = pev->args[i].field; |
2216 | while (field) { | |
2217 | next = field->next; | |
74cf249d | 2218 | zfree(&field->name); |
7df2f329 MH |
2219 | free(field); |
2220 | field = next; | |
2221 | } | |
2222 | } | |
f5385650 | 2223 | free(pev->args); |
4235b045 MH |
2224 | memset(pev, 0, sizeof(*pev)); |
2225 | } | |
2226 | ||
0542bb9c MH |
2227 | #define strdup_or_goto(str, label) \ |
2228 | ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) | |
2229 | ||
2230 | static int perf_probe_point__copy(struct perf_probe_point *dst, | |
2231 | struct perf_probe_point *src) | |
2232 | { | |
2233 | dst->file = strdup_or_goto(src->file, out_err); | |
2234 | dst->function = strdup_or_goto(src->function, out_err); | |
2235 | dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); | |
2236 | dst->line = src->line; | |
2237 | dst->retprobe = src->retprobe; | |
2238 | dst->offset = src->offset; | |
2239 | return 0; | |
2240 | ||
2241 | out_err: | |
2242 | clear_perf_probe_point(dst); | |
2243 | return -ENOMEM; | |
2244 | } | |
2245 | ||
2246 | static int perf_probe_arg__copy(struct perf_probe_arg *dst, | |
2247 | struct perf_probe_arg *src) | |
2248 | { | |
2249 | struct perf_probe_arg_field *field, **ppfield; | |
2250 | ||
2251 | dst->name = strdup_or_goto(src->name, out_err); | |
2252 | dst->var = strdup_or_goto(src->var, out_err); | |
2253 | dst->type = strdup_or_goto(src->type, out_err); | |
2254 | ||
2255 | field = src->field; | |
2256 | ppfield = &(dst->field); | |
2257 | while (field) { | |
2258 | *ppfield = zalloc(sizeof(*field)); | |
2259 | if (!*ppfield) | |
2260 | goto out_err; | |
2261 | (*ppfield)->name = strdup_or_goto(field->name, out_err); | |
2262 | (*ppfield)->index = field->index; | |
2263 | (*ppfield)->ref = field->ref; | |
2264 | field = field->next; | |
2265 | ppfield = &((*ppfield)->next); | |
2266 | } | |
2267 | return 0; | |
2268 | out_err: | |
2269 | return -ENOMEM; | |
2270 | } | |
2271 | ||
2272 | int perf_probe_event__copy(struct perf_probe_event *dst, | |
2273 | struct perf_probe_event *src) | |
2274 | { | |
2275 | int i; | |
2276 | ||
2277 | dst->event = strdup_or_goto(src->event, out_err); | |
2278 | dst->group = strdup_or_goto(src->group, out_err); | |
2279 | dst->target = strdup_or_goto(src->target, out_err); | |
2280 | dst->uprobes = src->uprobes; | |
2281 | ||
2282 | if (perf_probe_point__copy(&dst->point, &src->point) < 0) | |
2283 | goto out_err; | |
2284 | ||
2285 | dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); | |
2286 | if (!dst->args) | |
2287 | goto out_err; | |
2288 | dst->nargs = src->nargs; | |
2289 | ||
2290 | for (i = 0; i < src->nargs; i++) | |
2291 | if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) | |
2292 | goto out_err; | |
2293 | return 0; | |
2294 | ||
2295 | out_err: | |
2296 | clear_perf_probe_event(dst); | |
2297 | return -ENOMEM; | |
2298 | } | |
2299 | ||
92f6c72e | 2300 | void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 2301 | { |
0e60836b | 2302 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
2303 | int i; |
2304 | ||
f5385650 ACM |
2305 | free(tev->event); |
2306 | free(tev->group); | |
2307 | free(tev->point.symbol); | |
4c859351 | 2308 | free(tev->point.realname); |
f5385650 | 2309 | free(tev->point.module); |
4235b045 | 2310 | for (i = 0; i < tev->nargs; i++) { |
f5385650 ACM |
2311 | free(tev->args[i].name); |
2312 | free(tev->args[i].value); | |
2313 | free(tev->args[i].type); | |
4235b045 MH |
2314 | ref = tev->args[i].ref; |
2315 | while (ref) { | |
2316 | next = ref->next; | |
2317 | free(ref); | |
2318 | ref = next; | |
2319 | } | |
2320 | } | |
f5385650 | 2321 | free(tev->args); |
4235b045 | 2322 | memset(tev, 0, sizeof(*tev)); |
50656eec MH |
2323 | } |
2324 | ||
9aaf5a5f MH |
2325 | struct kprobe_blacklist_node { |
2326 | struct list_head list; | |
2327 | unsigned long start; | |
2328 | unsigned long end; | |
2329 | char *symbol; | |
2330 | }; | |
2331 | ||
2332 | static void kprobe_blacklist__delete(struct list_head *blacklist) | |
2333 | { | |
2334 | struct kprobe_blacklist_node *node; | |
2335 | ||
2336 | while (!list_empty(blacklist)) { | |
2337 | node = list_first_entry(blacklist, | |
2338 | struct kprobe_blacklist_node, list); | |
2339 | list_del(&node->list); | |
2340 | free(node->symbol); | |
2341 | free(node); | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | static int kprobe_blacklist__load(struct list_head *blacklist) | |
2346 | { | |
2347 | struct kprobe_blacklist_node *node; | |
4605eab3 | 2348 | const char *__debugfs = debugfs__mountpoint(); |
9aaf5a5f MH |
2349 | char buf[PATH_MAX], *p; |
2350 | FILE *fp; | |
2351 | int ret; | |
2352 | ||
2353 | if (__debugfs == NULL) | |
2354 | return -ENOTSUP; | |
2355 | ||
2356 | ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); | |
2357 | if (ret < 0) | |
2358 | return ret; | |
2359 | ||
2360 | fp = fopen(buf, "r"); | |
2361 | if (!fp) | |
2362 | return -errno; | |
2363 | ||
2364 | ret = 0; | |
2365 | while (fgets(buf, PATH_MAX, fp)) { | |
2366 | node = zalloc(sizeof(*node)); | |
2367 | if (!node) { | |
2368 | ret = -ENOMEM; | |
2369 | break; | |
2370 | } | |
2371 | INIT_LIST_HEAD(&node->list); | |
2372 | list_add_tail(&node->list, blacklist); | |
2373 | if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { | |
2374 | ret = -EINVAL; | |
2375 | break; | |
2376 | } | |
2377 | p = strchr(buf, '\t'); | |
2378 | if (p) { | |
2379 | p++; | |
2380 | if (p[strlen(p) - 1] == '\n') | |
2381 | p[strlen(p) - 1] = '\0'; | |
2382 | } else | |
2383 | p = (char *)"unknown"; | |
2384 | node->symbol = strdup(p); | |
2385 | if (!node->symbol) { | |
2386 | ret = -ENOMEM; | |
2387 | break; | |
2388 | } | |
2389 | pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", | |
2390 | node->start, node->end, node->symbol); | |
2391 | ret++; | |
2392 | } | |
2393 | if (ret < 0) | |
2394 | kprobe_blacklist__delete(blacklist); | |
2395 | fclose(fp); | |
2396 | ||
2397 | return ret; | |
2398 | } | |
2399 | ||
2400 | static struct kprobe_blacklist_node * | |
2401 | kprobe_blacklist__find_by_address(struct list_head *blacklist, | |
2402 | unsigned long address) | |
2403 | { | |
2404 | struct kprobe_blacklist_node *node; | |
2405 | ||
2406 | list_for_each_entry(node, blacklist, list) { | |
2c29461e | 2407 | if (node->start <= address && address < node->end) |
9aaf5a5f MH |
2408 | return node; |
2409 | } | |
2410 | ||
2411 | return NULL; | |
2412 | } | |
2413 | ||
b031220d MH |
2414 | static LIST_HEAD(kprobe_blacklist); |
2415 | ||
2416 | static void kprobe_blacklist__init(void) | |
2417 | { | |
2418 | if (!list_empty(&kprobe_blacklist)) | |
2419 | return; | |
2420 | ||
2421 | if (kprobe_blacklist__load(&kprobe_blacklist) < 0) | |
2422 | pr_debug("No kprobe blacklist support, ignored\n"); | |
2423 | } | |
2424 | ||
2425 | static void kprobe_blacklist__release(void) | |
2426 | { | |
2427 | kprobe_blacklist__delete(&kprobe_blacklist); | |
2428 | } | |
2429 | ||
2430 | static bool kprobe_blacklist__listed(unsigned long address) | |
2431 | { | |
2432 | return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); | |
2433 | } | |
2434 | ||
d350bd57 MH |
2435 | static int perf_probe_event__sprintf(const char *group, const char *event, |
2436 | struct perf_probe_event *pev, | |
ba7ecb02 MH |
2437 | const char *module, |
2438 | struct strbuf *result) | |
278498d4 | 2439 | { |
bf4d5f25 | 2440 | int i, ret; |
909b0360 | 2441 | char *buf; |
278498d4 | 2442 | |
909b0360 MH |
2443 | if (asprintf(&buf, "%s:%s", group, event) < 0) |
2444 | return -errno; | |
bf4d5f25 | 2445 | ret = strbuf_addf(result, " %-20s (on ", buf); |
909b0360 | 2446 | free(buf); |
bf4d5f25 MH |
2447 | if (ret) |
2448 | return ret; | |
4235b045 | 2449 | |
909b0360 MH |
2450 | /* Synthesize only event probe point */ |
2451 | buf = synthesize_perf_probe_point(&pev->point); | |
2452 | if (!buf) | |
2453 | return -ENOMEM; | |
bf4d5f25 | 2454 | ret = strbuf_addstr(result, buf); |
909b0360 | 2455 | free(buf); |
146a1439 | 2456 | |
bf4d5f25 MH |
2457 | if (!ret && module) |
2458 | ret = strbuf_addf(result, " in %s", module); | |
278498d4 | 2459 | |
bf4d5f25 MH |
2460 | if (!ret && pev->nargs > 0) { |
2461 | ret = strbuf_add(result, " with", 5); | |
2462 | for (i = 0; !ret && i < pev->nargs; i++) { | |
909b0360 MH |
2463 | buf = synthesize_perf_probe_arg(&pev->args[i]); |
2464 | if (!buf) | |
2465 | return -ENOMEM; | |
bf4d5f25 | 2466 | ret = strbuf_addf(result, " %s", buf); |
909b0360 | 2467 | free(buf); |
7df2f329 | 2468 | } |
278498d4 | 2469 | } |
bf4d5f25 MH |
2470 | if (!ret) |
2471 | ret = strbuf_addch(result, ')'); | |
909b0360 | 2472 | |
bf4d5f25 | 2473 | return ret; |
278498d4 MH |
2474 | } |
2475 | ||
ba7ecb02 | 2476 | /* Show an event */ |
b02137cc NK |
2477 | int show_perf_probe_event(const char *group, const char *event, |
2478 | struct perf_probe_event *pev, | |
2479 | const char *module, bool use_stdout) | |
ba7ecb02 MH |
2480 | { |
2481 | struct strbuf buf = STRBUF_INIT; | |
2482 | int ret; | |
2483 | ||
d350bd57 | 2484 | ret = perf_probe_event__sprintf(group, event, pev, module, &buf); |
ba7ecb02 MH |
2485 | if (ret >= 0) { |
2486 | if (use_stdout) | |
2487 | printf("%s\n", buf.buf); | |
2488 | else | |
2489 | pr_info("%s\n", buf.buf); | |
2490 | } | |
2491 | strbuf_release(&buf); | |
2492 | ||
2493 | return ret; | |
2494 | } | |
2495 | ||
b6a89643 MH |
2496 | static bool filter_probe_trace_event(struct probe_trace_event *tev, |
2497 | struct strfilter *filter) | |
2498 | { | |
2499 | char tmp[128]; | |
2500 | ||
2501 | /* At first, check the event name itself */ | |
2502 | if (strfilter__compare(filter, tev->event)) | |
2503 | return true; | |
2504 | ||
2505 | /* Next, check the combination of name and group */ | |
2506 | if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) | |
2507 | return false; | |
2508 | return strfilter__compare(filter, tmp); | |
2509 | } | |
2510 | ||
2511 | static int __show_perf_probe_events(int fd, bool is_kprobe, | |
2512 | struct strfilter *filter) | |
4de189fe | 2513 | { |
225466f1 | 2514 | int ret = 0; |
0e60836b | 2515 | struct probe_trace_event tev; |
4235b045 | 2516 | struct perf_probe_event pev; |
4de189fe MH |
2517 | struct strlist *rawlist; |
2518 | struct str_node *ent; | |
2519 | ||
4235b045 MH |
2520 | memset(&tev, 0, sizeof(tev)); |
2521 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 2522 | |
92f6c72e | 2523 | rawlist = probe_file__get_rawlist(fd); |
146a1439 | 2524 | if (!rawlist) |
6eb08660 | 2525 | return -ENOMEM; |
4de189fe | 2526 | |
602a1f4d | 2527 | strlist__for_each_entry(ent, rawlist) { |
0e60836b | 2528 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 | 2529 | if (ret >= 0) { |
b6a89643 MH |
2530 | if (!filter_probe_trace_event(&tev, filter)) |
2531 | goto next; | |
225466f1 SD |
2532 | ret = convert_to_perf_probe_event(&tev, &pev, |
2533 | is_kprobe); | |
ba7ecb02 MH |
2534 | if (ret < 0) |
2535 | goto next; | |
d350bd57 MH |
2536 | ret = show_perf_probe_event(pev.group, pev.event, |
2537 | &pev, tev.point.module, | |
ba7ecb02 | 2538 | true); |
146a1439 | 2539 | } |
b6a89643 | 2540 | next: |
4235b045 | 2541 | clear_perf_probe_event(&pev); |
0e60836b | 2542 | clear_probe_trace_event(&tev); |
146a1439 MH |
2543 | if (ret < 0) |
2544 | break; | |
4de189fe | 2545 | } |
4de189fe | 2546 | strlist__delete(rawlist); |
7737af01 MH |
2547 | /* Cleanup cached debuginfo if needed */ |
2548 | debuginfo_cache__exit(); | |
146a1439 MH |
2549 | |
2550 | return ret; | |
4de189fe MH |
2551 | } |
2552 | ||
225466f1 | 2553 | /* List up current perf-probe events */ |
b6a89643 | 2554 | int show_perf_probe_events(struct strfilter *filter) |
225466f1 | 2555 | { |
5e45187c | 2556 | int kp_fd, up_fd, ret; |
225466f1 SD |
2557 | |
2558 | setup_pager(); | |
225466f1 | 2559 | |
1f3736c9 MH |
2560 | if (probe_conf.cache) |
2561 | return probe_cache__show_all_caches(filter); | |
2562 | ||
9bae1e8c | 2563 | ret = init_probe_symbol_maps(false); |
225466f1 SD |
2564 | if (ret < 0) |
2565 | return ret; | |
2566 | ||
92f6c72e MH |
2567 | ret = probe_file__open_both(&kp_fd, &up_fd, 0); |
2568 | if (ret < 0) | |
2569 | return ret; | |
225466f1 | 2570 | |
92f6c72e MH |
2571 | if (kp_fd >= 0) |
2572 | ret = __show_perf_probe_events(kp_fd, true, filter); | |
2573 | if (up_fd >= 0 && ret >= 0) | |
b6a89643 | 2574 | ret = __show_perf_probe_events(up_fd, false, filter); |
92f6c72e MH |
2575 | if (kp_fd > 0) |
2576 | close(kp_fd); | |
2577 | if (up_fd > 0) | |
5e45187c | 2578 | close(up_fd); |
9bae1e8c | 2579 | exit_probe_symbol_maps(); |
225466f1 | 2580 | |
146a1439 | 2581 | return ret; |
50656eec MH |
2582 | } |
2583 | ||
146a1439 | 2584 | static int get_new_event_name(char *buf, size_t len, const char *base, |
e63c625a MH |
2585 | struct strlist *namelist, bool ret_event, |
2586 | bool allow_suffix) | |
b498ce1f MH |
2587 | { |
2588 | int i, ret; | |
663b1151 | 2589 | char *p, *nbase; |
17f88fcd | 2590 | |
3099c026 NR |
2591 | if (*base == '.') |
2592 | base++; | |
663b1151 MH |
2593 | nbase = strdup(base); |
2594 | if (!nbase) | |
2595 | return -ENOMEM; | |
2596 | ||
a3110cd9 MH |
2597 | /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */ |
2598 | p = strpbrk(nbase, ".@"); | |
663b1151 MH |
2599 | if (p && p != nbase) |
2600 | *p = '\0'; | |
3099c026 | 2601 | |
663b1151 | 2602 | /* Try no suffix number */ |
e63c625a | 2603 | ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : ""); |
146a1439 | 2604 | if (ret < 0) { |
5f03cba4 | 2605 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2606 | goto out; |
146a1439 | 2607 | } |
17f88fcd | 2608 | if (!strlist__has_entry(namelist, buf)) |
663b1151 | 2609 | goto out; |
17f88fcd | 2610 | |
d761b08b | 2611 | if (!allow_suffix) { |
03e01f56 WN |
2612 | pr_warning("Error: event \"%s\" already exists.\n" |
2613 | " Hint: Remove existing event by 'perf probe -d'\n" | |
2614 | " or force duplicates by 'perf probe -f'\n" | |
2615 | " or set 'force=yes' in BPF source.\n", | |
2616 | buf); | |
663b1151 MH |
2617 | ret = -EEXIST; |
2618 | goto out; | |
d761b08b MH |
2619 | } |
2620 | ||
17f88fcd MH |
2621 | /* Try to add suffix */ |
2622 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
663b1151 | 2623 | ret = e_snprintf(buf, len, "%s_%d", nbase, i); |
146a1439 | 2624 | if (ret < 0) { |
5f03cba4 | 2625 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2626 | goto out; |
146a1439 | 2627 | } |
b498ce1f MH |
2628 | if (!strlist__has_entry(namelist, buf)) |
2629 | break; | |
2630 | } | |
146a1439 MH |
2631 | if (i == MAX_EVENT_INDEX) { |
2632 | pr_warning("Too many events are on the same function.\n"); | |
2633 | ret = -ERANGE; | |
2634 | } | |
2635 | ||
663b1151 MH |
2636 | out: |
2637 | free(nbase); | |
9f5c6d87 MH |
2638 | |
2639 | /* Final validation */ | |
2640 | if (ret >= 0 && !is_c_func_name(buf)) { | |
2641 | pr_warning("Internal error: \"%s\" is an invalid event name.\n", | |
2642 | buf); | |
2643 | ret = -EINVAL; | |
2644 | } | |
2645 | ||
146a1439 | 2646 | return ret; |
b498ce1f MH |
2647 | } |
2648 | ||
79702f61 MH |
2649 | /* Warn if the current kernel's uprobe implementation is old */ |
2650 | static void warn_uprobe_event_compat(struct probe_trace_event *tev) | |
2651 | { | |
2652 | int i; | |
2653 | char *buf = synthesize_probe_trace_command(tev); | |
5a5e3d3c RB |
2654 | struct probe_trace_point *tp = &tev->point; |
2655 | ||
2656 | if (tp->ref_ctr_offset && !uprobe_ref_ctr_is_supported()) { | |
2657 | pr_warning("A semaphore is associated with %s:%s and " | |
2658 | "seems your kernel doesn't support it.\n", | |
2659 | tev->group, tev->event); | |
2660 | } | |
79702f61 MH |
2661 | |
2662 | /* Old uprobe event doesn't support memory dereference */ | |
2663 | if (!tev->uprobes || tev->nargs == 0 || !buf) | |
2664 | goto out; | |
2665 | ||
2666 | for (i = 0; i < tev->nargs; i++) | |
2667 | if (strglobmatch(tev->args[i].value, "[$@+-]*")) { | |
2668 | pr_warning("Please upgrade your kernel to at least " | |
2669 | "3.14 to have access to feature %s\n", | |
2670 | tev->args[i].value); | |
2671 | break; | |
2672 | } | |
2673 | out: | |
2674 | free(buf); | |
2675 | } | |
2676 | ||
a3c9de62 MH |
2677 | /* Set new name from original perf_probe_event and namelist */ |
2678 | static int probe_trace_event__set_name(struct probe_trace_event *tev, | |
2679 | struct perf_probe_event *pev, | |
2680 | struct strlist *namelist, | |
2681 | bool allow_suffix) | |
2682 | { | |
2683 | const char *event, *group; | |
2684 | char buf[64]; | |
2685 | int ret; | |
2686 | ||
bc062230 | 2687 | /* If probe_event or trace_event already have the name, reuse it */ |
42bba263 | 2688 | if (pev->event && !pev->sdt) |
a3c9de62 | 2689 | event = pev->event; |
bc062230 MH |
2690 | else if (tev->event) |
2691 | event = tev->event; | |
2692 | else { | |
2693 | /* Or generate new one from probe point */ | |
da15bd9d WN |
2694 | if (pev->point.function && |
2695 | (strncmp(pev->point.function, "0x", 2) != 0) && | |
2696 | !strisglob(pev->point.function)) | |
a3c9de62 MH |
2697 | event = pev->point.function; |
2698 | else | |
2699 | event = tev->point.realname; | |
bc062230 | 2700 | } |
42bba263 | 2701 | if (pev->group && !pev->sdt) |
a3c9de62 | 2702 | group = pev->group; |
bc062230 MH |
2703 | else if (tev->group) |
2704 | group = tev->group; | |
a3c9de62 MH |
2705 | else |
2706 | group = PERFPROBE_GROUP; | |
2707 | ||
2708 | /* Get an unused new event name */ | |
e63c625a MH |
2709 | ret = get_new_event_name(buf, 64, event, namelist, |
2710 | tev->point.retprobe, allow_suffix); | |
a3c9de62 MH |
2711 | if (ret < 0) |
2712 | return ret; | |
2713 | ||
2714 | event = buf; | |
2715 | ||
2716 | tev->event = strdup(event); | |
2717 | tev->group = strdup(group); | |
2718 | if (tev->event == NULL || tev->group == NULL) | |
2719 | return -ENOMEM; | |
2720 | ||
2721 | /* Add added event name to namelist */ | |
2722 | strlist__add(namelist, event); | |
2723 | return 0; | |
2724 | } | |
2725 | ||
1de7b8bf MH |
2726 | static int __open_probe_file_and_namelist(bool uprobe, |
2727 | struct strlist **namelist) | |
50656eec | 2728 | { |
1de7b8bf | 2729 | int fd; |
50656eec | 2730 | |
1de7b8bf | 2731 | fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); |
92f6c72e | 2732 | if (fd < 0) |
146a1439 | 2733 | return fd; |
5e45187c | 2734 | |
b498ce1f | 2735 | /* Get current event names */ |
1de7b8bf MH |
2736 | *namelist = probe_file__get_namelist(fd); |
2737 | if (!(*namelist)) { | |
146a1439 | 2738 | pr_debug("Failed to get current event list.\n"); |
1de7b8bf MH |
2739 | close(fd); |
2740 | return -ENOMEM; | |
146a1439 | 2741 | } |
1de7b8bf MH |
2742 | return fd; |
2743 | } | |
2744 | ||
2745 | static int __add_probe_trace_events(struct perf_probe_event *pev, | |
2746 | struct probe_trace_event *tevs, | |
2747 | int ntevs, bool allow_suffix) | |
2748 | { | |
2749 | int i, fd[2] = {-1, -1}, up, ret; | |
2750 | struct probe_trace_event *tev = NULL; | |
2751 | struct probe_cache *cache = NULL; | |
2752 | struct strlist *namelist[2] = {NULL, NULL}; | |
544abd44 | 2753 | struct nscookie nsc; |
1de7b8bf MH |
2754 | |
2755 | up = pev->uprobes ? 1 : 0; | |
2756 | fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); | |
2757 | if (fd[up] < 0) | |
2758 | return fd[up]; | |
4235b045 | 2759 | |
146a1439 | 2760 | ret = 0; |
02b95dad | 2761 | for (i = 0; i < ntevs; i++) { |
4235b045 | 2762 | tev = &tevs[i]; |
1de7b8bf MH |
2763 | up = tev->uprobes ? 1 : 0; |
2764 | if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ | |
2765 | fd[up] = __open_probe_file_and_namelist(up, | |
2766 | &namelist[up]); | |
2767 | if (fd[up] < 0) | |
2768 | goto close_out; | |
2769 | } | |
b031220d | 2770 | /* Skip if the symbol is out of .text or blacklisted */ |
bc062230 | 2771 | if (!tev->point.symbol && !pev->uprobes) |
5a51fcd1 | 2772 | continue; |
9aaf5a5f | 2773 | |
a3c9de62 | 2774 | /* Set new name for tev (and update namelist) */ |
1de7b8bf | 2775 | ret = probe_trace_event__set_name(tev, pev, namelist[up], |
a3c9de62 | 2776 | allow_suffix); |
146a1439 MH |
2777 | if (ret < 0) |
2778 | break; | |
4235b045 | 2779 | |
544abd44 | 2780 | nsinfo__mountns_enter(pev->nsi, &nsc); |
1de7b8bf | 2781 | ret = probe_file__add_event(fd[up], tev); |
544abd44 | 2782 | nsinfo__mountns_exit(&nsc); |
146a1439 MH |
2783 | if (ret < 0) |
2784 | break; | |
4235b045 | 2785 | |
4235b045 MH |
2786 | /* |
2787 | * Probes after the first probe which comes from same | |
2788 | * user input are always allowed to add suffix, because | |
2789 | * there might be several addresses corresponding to | |
2790 | * one code line. | |
2791 | */ | |
2792 | allow_suffix = true; | |
50656eec | 2793 | } |
79702f61 MH |
2794 | if (ret == -EINVAL && pev->uprobes) |
2795 | warn_uprobe_event_compat(tev); | |
2fd457a3 | 2796 | if (ret == 0 && probe_conf.cache) { |
f045b8c4 | 2797 | cache = probe_cache__new(pev->target, pev->nsi); |
2fd457a3 MH |
2798 | if (!cache || |
2799 | probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || | |
2800 | probe_cache__commit(cache) < 0) | |
2801 | pr_warning("Failed to add event to probe cache\n"); | |
2802 | probe_cache__delete(cache); | |
2803 | } | |
146a1439 | 2804 | |
ae2cb1ac | 2805 | close_out: |
1de7b8bf MH |
2806 | for (up = 0; up < 2; up++) { |
2807 | strlist__delete(namelist[up]); | |
2808 | if (fd[up] >= 0) | |
2809 | close(fd[up]); | |
2810 | } | |
146a1439 | 2811 | return ret; |
50656eec | 2812 | } |
fa28244d | 2813 | |
6bb536cc WN |
2814 | static int find_probe_functions(struct map *map, char *name, |
2815 | struct symbol **syms) | |
eb948e50 | 2816 | { |
564c62a4 | 2817 | int found = 0; |
0a3873a8 | 2818 | struct symbol *sym; |
4c859351 | 2819 | struct rb_node *tmp; |
4b3a2716 MH |
2820 | const char *norm, *ver; |
2821 | char *buf = NULL; | |
c588d158 | 2822 | bool cut_version = true; |
564c62a4 | 2823 | |
be39db9f | 2824 | if (map__load(map) < 0) |
75e4a2a6 WN |
2825 | return 0; |
2826 | ||
c588d158 MH |
2827 | /* If user gives a version, don't cut off the version from symbols */ |
2828 | if (strchr(name, '@')) | |
2829 | cut_version = false; | |
2830 | ||
4c859351 | 2831 | map__for_each_symbol(map, sym, tmp) { |
4b3a2716 MH |
2832 | norm = arch__normalize_symbol_name(sym->name); |
2833 | if (!norm) | |
2834 | continue; | |
2835 | ||
c588d158 MH |
2836 | if (cut_version) { |
2837 | /* We don't care about default symbol or not */ | |
2838 | ver = strchr(norm, '@'); | |
2839 | if (ver) { | |
2840 | buf = strndup(norm, ver - norm); | |
2841 | if (!buf) | |
2842 | return -ENOMEM; | |
2843 | norm = buf; | |
2844 | } | |
4b3a2716 | 2845 | } |
c588d158 | 2846 | |
4b3a2716 | 2847 | if (strglobmatch(norm, name)) { |
4c859351 | 2848 | found++; |
6bb536cc WN |
2849 | if (syms && found < probe_conf.max_probes) |
2850 | syms[found - 1] = sym; | |
2851 | } | |
4b3a2716 MH |
2852 | if (buf) |
2853 | zfree(&buf); | |
eb948e50 | 2854 | } |
564c62a4 NK |
2855 | |
2856 | return found; | |
eb948e50 MH |
2857 | } |
2858 | ||
7b6ff0bd NR |
2859 | void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, |
2860 | struct probe_trace_event *tev __maybe_unused, | |
0b3c2264 NR |
2861 | struct map *map __maybe_unused, |
2862 | struct symbol *sym __maybe_unused) { } | |
7b6ff0bd | 2863 | |
eb948e50 MH |
2864 | /* |
2865 | * Find probe function addresses from map. | |
2866 | * Return an error or the number of found probe_trace_event | |
2867 | */ | |
2868 | static int find_probe_trace_events_from_map(struct perf_probe_event *pev, | |
ddb2f58f | 2869 | struct probe_trace_event **tevs) |
e0faa8d3 | 2870 | { |
eb948e50 | 2871 | struct map *map = NULL; |
eb948e50 | 2872 | struct ref_reloc_sym *reloc_sym = NULL; |
e0faa8d3 | 2873 | struct symbol *sym; |
6bb536cc | 2874 | struct symbol **syms = NULL; |
0e60836b | 2875 | struct probe_trace_event *tev; |
eb948e50 MH |
2876 | struct perf_probe_point *pp = &pev->point; |
2877 | struct probe_trace_point *tp; | |
564c62a4 | 2878 | int num_matched_functions; |
b031220d | 2879 | int ret, i, j, skipped = 0; |
c61fb959 | 2880 | char *mod_name; |
4235b045 | 2881 | |
544abd44 | 2882 | map = get_target_map(pev->target, pev->nsi, pev->uprobes); |
eb948e50 MH |
2883 | if (!map) { |
2884 | ret = -EINVAL; | |
2885 | goto out; | |
fb7345bb MH |
2886 | } |
2887 | ||
6bb536cc WN |
2888 | syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); |
2889 | if (!syms) { | |
2890 | ret = -ENOMEM; | |
2891 | goto out; | |
2892 | } | |
2893 | ||
eb948e50 MH |
2894 | /* |
2895 | * Load matched symbols: Since the different local symbols may have | |
2896 | * same name but different addresses, this lists all the symbols. | |
2897 | */ | |
6bb536cc | 2898 | num_matched_functions = find_probe_functions(map, pp->function, syms); |
4b3a2716 | 2899 | if (num_matched_functions <= 0) { |
eb948e50 | 2900 | pr_err("Failed to find symbol %s in %s\n", pp->function, |
44225521 | 2901 | pev->target ? : "kernel"); |
eb948e50 MH |
2902 | ret = -ENOENT; |
2903 | goto out; | |
ddb2f58f | 2904 | } else if (num_matched_functions > probe_conf.max_probes) { |
eb948e50 | 2905 | pr_err("Too many functions matched in %s\n", |
44225521 | 2906 | pev->target ? : "kernel"); |
eb948e50 MH |
2907 | ret = -E2BIG; |
2908 | goto out; | |
fb7345bb MH |
2909 | } |
2910 | ||
1a8ac29c | 2911 | /* Note that the symbols in the kmodule are not relocated */ |
7ab31d94 NR |
2912 | if (!pev->uprobes && !pev->target && |
2913 | (!pp->retprobe || kretprobe_offset_is_supported())) { | |
0560a0c4 | 2914 | reloc_sym = kernel_get_ref_reloc_sym(); |
eb948e50 MH |
2915 | if (!reloc_sym) { |
2916 | pr_warning("Relocated base symbol is not found!\n"); | |
2917 | ret = -EINVAL; | |
2918 | goto out; | |
2919 | } | |
2920 | } | |
4235b045 | 2921 | |
eb948e50 MH |
2922 | /* Setup result trace-probe-events */ |
2923 | *tevs = zalloc(sizeof(*tev) * num_matched_functions); | |
2924 | if (!*tevs) { | |
02b95dad | 2925 | ret = -ENOMEM; |
eb948e50 | 2926 | goto out; |
02b95dad | 2927 | } |
ce27a443 | 2928 | |
eb948e50 | 2929 | ret = 0; |
564c62a4 | 2930 | |
6bb536cc WN |
2931 | for (j = 0; j < num_matched_functions; j++) { |
2932 | sym = syms[j]; | |
2933 | ||
eb948e50 MH |
2934 | tev = (*tevs) + ret; |
2935 | tp = &tev->point; | |
2936 | if (ret == num_matched_functions) { | |
2937 | pr_warning("Too many symbols are listed. Skip it.\n"); | |
2938 | break; | |
ce27a443 | 2939 | } |
eb948e50 | 2940 | ret++; |
ce27a443 | 2941 | |
eb948e50 MH |
2942 | if (pp->offset > sym->end - sym->start) { |
2943 | pr_warning("Offset %ld is bigger than the size of %s\n", | |
2944 | pp->offset, sym->name); | |
2945 | ret = -ENOENT; | |
2946 | goto err_out; | |
2947 | } | |
2948 | /* Add one probe point */ | |
2949 | tp->address = map->unmap_ip(map, sym->start) + pp->offset; | |
1a8ac29c MH |
2950 | |
2951 | /* Check the kprobe (not in module) is within .text */ | |
2952 | if (!pev->uprobes && !pev->target && | |
b031220d MH |
2953 | kprobe_warn_out_range(sym->name, tp->address)) { |
2954 | tp->symbol = NULL; /* Skip it */ | |
2955 | skipped++; | |
2956 | } else if (reloc_sym) { | |
eb948e50 MH |
2957 | tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); |
2958 | tp->offset = tp->address - reloc_sym->addr; | |
2959 | } else { | |
2960 | tp->symbol = strdup_or_goto(sym->name, nomem_out); | |
2961 | tp->offset = pp->offset; | |
2962 | } | |
6bb536cc WN |
2963 | tp->realname = strdup_or_goto(sym->name, nomem_out); |
2964 | ||
eb948e50 | 2965 | tp->retprobe = pp->retprobe; |
c61fb959 RB |
2966 | if (pev->target) { |
2967 | if (pev->uprobes) { | |
2968 | tev->point.module = strdup_or_goto(pev->target, | |
2969 | nomem_out); | |
2970 | } else { | |
2971 | mod_name = find_module_name(pev->target); | |
2972 | tev->point.module = | |
2973 | strdup(mod_name ? mod_name : pev->target); | |
2974 | free(mod_name); | |
2975 | if (!tev->point.module) | |
2976 | goto nomem_out; | |
2977 | } | |
2978 | } | |
eb948e50 MH |
2979 | tev->uprobes = pev->uprobes; |
2980 | tev->nargs = pev->nargs; | |
2981 | if (tev->nargs) { | |
2982 | tev->args = zalloc(sizeof(struct probe_trace_arg) * | |
2983 | tev->nargs); | |
2984 | if (tev->args == NULL) | |
2985 | goto nomem_out; | |
e334016f | 2986 | } |
48481938 | 2987 | for (i = 0; i < tev->nargs; i++) { |
eb948e50 MH |
2988 | if (pev->args[i].name) |
2989 | tev->args[i].name = | |
2990 | strdup_or_goto(pev->args[i].name, | |
2991 | nomem_out); | |
2992 | ||
2993 | tev->args[i].value = strdup_or_goto(pev->args[i].var, | |
2994 | nomem_out); | |
2995 | if (pev->args[i].type) | |
2996 | tev->args[i].type = | |
2997 | strdup_or_goto(pev->args[i].type, | |
2998 | nomem_out); | |
48481938 | 2999 | } |
0b3c2264 | 3000 | arch__fix_tev_from_maps(pev, tev, map, sym); |
4235b045 | 3001 | } |
b031220d MH |
3002 | if (ret == skipped) { |
3003 | ret = -ENOENT; | |
3004 | goto err_out; | |
3005 | } | |
4235b045 | 3006 | |
eb948e50 | 3007 | out: |
eebc509b | 3008 | map__put(map); |
6bb536cc | 3009 | free(syms); |
eb948e50 | 3010 | return ret; |
225466f1 | 3011 | |
eb948e50 MH |
3012 | nomem_out: |
3013 | ret = -ENOMEM; | |
3014 | err_out: | |
3015 | clear_probe_trace_events(*tevs, num_matched_functions); | |
3016 | zfree(tevs); | |
3017 | goto out; | |
3018 | } | |
1c1bc922 | 3019 | |
da15bd9d WN |
3020 | static int try_to_find_absolute_address(struct perf_probe_event *pev, |
3021 | struct probe_trace_event **tevs) | |
3022 | { | |
3023 | struct perf_probe_point *pp = &pev->point; | |
3024 | struct probe_trace_event *tev; | |
3025 | struct probe_trace_point *tp; | |
3026 | int i, err; | |
3027 | ||
3028 | if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) | |
3029 | return -EINVAL; | |
3030 | if (perf_probe_event_need_dwarf(pev)) | |
3031 | return -EINVAL; | |
3032 | ||
3033 | /* | |
3034 | * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at | |
3035 | * absolute address. | |
3036 | * | |
3037 | * Only one tev can be generated by this. | |
3038 | */ | |
3039 | *tevs = zalloc(sizeof(*tev)); | |
3040 | if (!*tevs) | |
3041 | return -ENOMEM; | |
3042 | ||
3043 | tev = *tevs; | |
3044 | tp = &tev->point; | |
3045 | ||
3046 | /* | |
3047 | * Don't use tp->offset, use address directly, because | |
3048 | * in synthesize_probe_trace_command() address cannot be | |
3049 | * zero. | |
3050 | */ | |
3051 | tp->address = pev->point.abs_address; | |
3052 | tp->retprobe = pp->retprobe; | |
3053 | tev->uprobes = pev->uprobes; | |
3054 | ||
3055 | err = -ENOMEM; | |
3056 | /* | |
3057 | * Give it a '0x' leading symbol name. | |
3058 | * In __add_probe_trace_events, a NULL symbol is interpreted as | |
adba1634 | 3059 | * invalid. |
da15bd9d WN |
3060 | */ |
3061 | if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) | |
3062 | goto errout; | |
3063 | ||
3064 | /* For kprobe, check range */ | |
3065 | if ((!tev->uprobes) && | |
3066 | (kprobe_warn_out_range(tev->point.symbol, | |
3067 | tev->point.address))) { | |
3068 | err = -EACCES; | |
3069 | goto errout; | |
3070 | } | |
3071 | ||
3072 | if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) | |
3073 | goto errout; | |
3074 | ||
3075 | if (pev->target) { | |
3076 | tp->module = strdup(pev->target); | |
3077 | if (!tp->module) | |
3078 | goto errout; | |
3079 | } | |
3080 | ||
3081 | if (tev->group) { | |
3082 | tev->group = strdup(pev->group); | |
3083 | if (!tev->group) | |
3084 | goto errout; | |
3085 | } | |
3086 | ||
3087 | if (pev->event) { | |
3088 | tev->event = strdup(pev->event); | |
3089 | if (!tev->event) | |
3090 | goto errout; | |
3091 | } | |
3092 | ||
3093 | tev->nargs = pev->nargs; | |
3094 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
d1d0e29c | 3095 | if (!tev->args) |
da15bd9d | 3096 | goto errout; |
d1d0e29c | 3097 | |
da15bd9d WN |
3098 | for (i = 0; i < tev->nargs; i++) |
3099 | copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); | |
3100 | ||
3101 | return 1; | |
3102 | ||
3103 | errout: | |
42e233ca ME |
3104 | clear_probe_trace_events(*tevs, 1); |
3105 | *tevs = NULL; | |
da15bd9d WN |
3106 | return err; |
3107 | } | |
3108 | ||
42bba263 MH |
3109 | /* Concatinate two arrays */ |
3110 | static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) | |
3111 | { | |
3112 | void *ret; | |
3113 | ||
3114 | ret = malloc(sz_a + sz_b); | |
3115 | if (ret) { | |
3116 | memcpy(ret, a, sz_a); | |
3117 | memcpy(ret + sz_a, b, sz_b); | |
3118 | } | |
3119 | return ret; | |
3120 | } | |
3121 | ||
3122 | static int | |
3123 | concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, | |
3124 | struct probe_trace_event **tevs2, int ntevs2) | |
3125 | { | |
3126 | struct probe_trace_event *new_tevs; | |
3127 | int ret = 0; | |
3128 | ||
f0a30dca | 3129 | if (*ntevs == 0) { |
42bba263 MH |
3130 | *tevs = *tevs2; |
3131 | *ntevs = ntevs2; | |
3132 | *tevs2 = NULL; | |
3133 | return 0; | |
3134 | } | |
3135 | ||
3136 | if (*ntevs + ntevs2 > probe_conf.max_probes) | |
3137 | ret = -E2BIG; | |
3138 | else { | |
3139 | /* Concatinate the array of probe_trace_event */ | |
3140 | new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), | |
3141 | *tevs2, ntevs2 * sizeof(**tevs2)); | |
3142 | if (!new_tevs) | |
3143 | ret = -ENOMEM; | |
3144 | else { | |
3145 | free(*tevs); | |
3146 | *tevs = new_tevs; | |
3147 | *ntevs += ntevs2; | |
3148 | } | |
3149 | } | |
3150 | if (ret < 0) | |
3151 | clear_probe_trace_events(*tevs2, ntevs2); | |
3152 | zfree(tevs2); | |
3153 | ||
3154 | return ret; | |
3155 | } | |
3156 | ||
3157 | /* | |
3158 | * Try to find probe_trace_event from given probe caches. Return the number | |
3159 | * of cached events found, if an error occurs return the error. | |
3160 | */ | |
3161 | static int find_cached_events(struct perf_probe_event *pev, | |
3162 | struct probe_trace_event **tevs, | |
3163 | const char *target) | |
3164 | { | |
3165 | struct probe_cache *cache; | |
3166 | struct probe_cache_entry *entry; | |
3167 | struct probe_trace_event *tmp_tevs = NULL; | |
3168 | int ntevs = 0; | |
3169 | int ret = 0; | |
3170 | ||
f045b8c4 | 3171 | cache = probe_cache__new(target, pev->nsi); |
42bba263 MH |
3172 | /* Return 0 ("not found") if the target has no probe cache. */ |
3173 | if (!cache) | |
3174 | return 0; | |
3175 | ||
3176 | for_each_probe_cache_entry(entry, cache) { | |
3177 | /* Skip the cache entry which has no name */ | |
3178 | if (!entry->pev.event || !entry->pev.group) | |
3179 | continue; | |
3180 | if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && | |
3181 | strglobmatch(entry->pev.event, pev->event)) { | |
3182 | ret = probe_cache_entry__get_event(entry, &tmp_tevs); | |
3183 | if (ret > 0) | |
3184 | ret = concat_probe_trace_events(tevs, &ntevs, | |
3185 | &tmp_tevs, ret); | |
3186 | if (ret < 0) | |
3187 | break; | |
3188 | } | |
3189 | } | |
3190 | probe_cache__delete(cache); | |
3191 | if (ret < 0) { | |
3192 | clear_probe_trace_events(*tevs, ntevs); | |
3193 | zfree(tevs); | |
3194 | } else { | |
3195 | ret = ntevs; | |
3196 | if (ntevs > 0 && target && target[0] == '/') | |
3197 | pev->uprobes = true; | |
3198 | } | |
3199 | ||
3200 | return ret; | |
3201 | } | |
3202 | ||
1de7b8bf MH |
3203 | /* Try to find probe_trace_event from all probe caches */ |
3204 | static int find_cached_events_all(struct perf_probe_event *pev, | |
3205 | struct probe_trace_event **tevs) | |
3206 | { | |
3207 | struct probe_trace_event *tmp_tevs = NULL; | |
3208 | struct strlist *bidlist; | |
3209 | struct str_node *nd; | |
3210 | char *pathname; | |
3211 | int ntevs = 0; | |
3212 | int ret; | |
3213 | ||
3214 | /* Get the buildid list of all valid caches */ | |
3215 | bidlist = build_id_cache__list_all(true); | |
3216 | if (!bidlist) { | |
3217 | ret = -errno; | |
3218 | pr_debug("Failed to get buildids: %d\n", ret); | |
3219 | return ret; | |
3220 | } | |
3221 | ||
3222 | ret = 0; | |
3223 | strlist__for_each_entry(nd, bidlist) { | |
3224 | pathname = build_id_cache__origname(nd->s); | |
3225 | ret = find_cached_events(pev, &tmp_tevs, pathname); | |
3226 | /* In the case of cnt == 0, we just skip it */ | |
3227 | if (ret > 0) | |
3228 | ret = concat_probe_trace_events(tevs, &ntevs, | |
3229 | &tmp_tevs, ret); | |
3230 | free(pathname); | |
3231 | if (ret < 0) | |
3232 | break; | |
3233 | } | |
3234 | strlist__delete(bidlist); | |
3235 | ||
3236 | if (ret < 0) { | |
3237 | clear_probe_trace_events(*tevs, ntevs); | |
3238 | zfree(tevs); | |
3239 | } else | |
3240 | ret = ntevs; | |
3241 | ||
3242 | return ret; | |
3243 | } | |
3244 | ||
bc062230 MH |
3245 | static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, |
3246 | struct probe_trace_event **tevs) | |
3247 | { | |
3248 | struct probe_cache *cache; | |
3249 | struct probe_cache_entry *entry; | |
3250 | struct probe_trace_event *tev; | |
3251 | struct str_node *node; | |
3252 | int ret, i; | |
3253 | ||
1de7b8bf | 3254 | if (pev->sdt) { |
42bba263 | 3255 | /* For SDT/cached events, we use special search functions */ |
1de7b8bf MH |
3256 | if (!pev->target) |
3257 | return find_cached_events_all(pev, tevs); | |
3258 | else | |
3259 | return find_cached_events(pev, tevs, pev->target); | |
3260 | } | |
f045b8c4 | 3261 | cache = probe_cache__new(pev->target, pev->nsi); |
bc062230 MH |
3262 | if (!cache) |
3263 | return 0; | |
3264 | ||
3265 | entry = probe_cache__find(cache, pev); | |
3266 | if (!entry) { | |
36a009fe MH |
3267 | /* SDT must be in the cache */ |
3268 | ret = pev->sdt ? -ENOENT : 0; | |
bc062230 MH |
3269 | goto out; |
3270 | } | |
3271 | ||
3272 | ret = strlist__nr_entries(entry->tevlist); | |
3273 | if (ret > probe_conf.max_probes) { | |
3274 | pr_debug("Too many entries matched in the cache of %s\n", | |
3275 | pev->target ? : "kernel"); | |
3276 | ret = -E2BIG; | |
3277 | goto out; | |
3278 | } | |
3279 | ||
3280 | *tevs = zalloc(ret * sizeof(*tev)); | |
3281 | if (!*tevs) { | |
3282 | ret = -ENOMEM; | |
3283 | goto out; | |
3284 | } | |
3285 | ||
3286 | i = 0; | |
3287 | strlist__for_each_entry(node, entry->tevlist) { | |
3288 | tev = &(*tevs)[i++]; | |
3289 | ret = parse_probe_trace_command(node->s, tev); | |
3290 | if (ret < 0) | |
3291 | goto out; | |
3292 | /* Set the uprobes attribute as same as original */ | |
3293 | tev->uprobes = pev->uprobes; | |
3294 | } | |
3295 | ret = i; | |
3296 | ||
3297 | out: | |
3298 | probe_cache__delete(cache); | |
3299 | return ret; | |
3300 | } | |
3301 | ||
eb948e50 | 3302 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 3303 | struct probe_trace_event **tevs) |
eb948e50 MH |
3304 | { |
3305 | int ret; | |
3306 | ||
36a009fe | 3307 | if (!pev->group && !pev->sdt) { |
2a12ec13 MH |
3308 | /* Set group name if not given */ |
3309 | if (!pev->uprobes) { | |
3310 | pev->group = strdup(PERFPROBE_GROUP); | |
3311 | ret = pev->group ? 0 : -ENOMEM; | |
3312 | } else | |
3313 | ret = convert_exec_to_group(pev->target, &pev->group); | |
eb948e50 MH |
3314 | if (ret != 0) { |
3315 | pr_warning("Failed to make a group name.\n"); | |
3316 | return ret; | |
3317 | } | |
02b95dad | 3318 | } |
e334016f | 3319 | |
da15bd9d WN |
3320 | ret = try_to_find_absolute_address(pev, tevs); |
3321 | if (ret > 0) | |
3322 | return ret; | |
3323 | ||
bc062230 MH |
3324 | /* At first, we need to lookup cache entry */ |
3325 | ret = find_probe_trace_events_from_cache(pev, tevs); | |
36a009fe MH |
3326 | if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ |
3327 | return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ | |
bc062230 | 3328 | |
eb948e50 | 3329 | /* Convert perf_probe_event with debuginfo */ |
ddb2f58f | 3330 | ret = try_to_find_probe_trace_events(pev, tevs); |
eb948e50 MH |
3331 | if (ret != 0) |
3332 | return ret; /* Found in debuginfo or got an error */ | |
3333 | ||
ddb2f58f | 3334 | return find_probe_trace_events_from_map(pev, tevs); |
4235b045 MH |
3335 | } |
3336 | ||
12fae5ef | 3337 | int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
4235b045 | 3338 | { |
844dffa5 | 3339 | int i, ret; |
4235b045 | 3340 | |
4235b045 MH |
3341 | /* Loop 1: convert all events */ |
3342 | for (i = 0; i < npevs; i++) { | |
b031220d | 3343 | /* Init kprobe blacklist if needed */ |
12fae5ef | 3344 | if (!pevs[i].uprobes) |
b031220d | 3345 | kprobe_blacklist__init(); |
4235b045 | 3346 | /* Convert with or without debuginfo */ |
12fae5ef | 3347 | ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); |
146a1439 | 3348 | if (ret < 0) |
844dffa5 | 3349 | return ret; |
12fae5ef | 3350 | pevs[i].ntevs = ret; |
e0faa8d3 | 3351 | } |
b031220d MH |
3352 | /* This just release blacklist only if allocated */ |
3353 | kprobe_blacklist__release(); | |
e0faa8d3 | 3354 | |
844dffa5 NK |
3355 | return 0; |
3356 | } | |
3357 | ||
1c20b1d1 MH |
3358 | static int show_probe_trace_event(struct probe_trace_event *tev) |
3359 | { | |
3360 | char *buf = synthesize_probe_trace_command(tev); | |
3361 | ||
3362 | if (!buf) { | |
3363 | pr_debug("Failed to synthesize probe trace event.\n"); | |
3364 | return -EINVAL; | |
3365 | } | |
3366 | ||
3367 | /* Showing definition always go stdout */ | |
3368 | printf("%s\n", buf); | |
3369 | free(buf); | |
3370 | ||
3371 | return 0; | |
3372 | } | |
3373 | ||
3374 | int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) | |
3375 | { | |
3376 | struct strlist *namelist = strlist__new(NULL, NULL); | |
3377 | struct probe_trace_event *tev; | |
3378 | struct perf_probe_event *pev; | |
3379 | int i, j, ret = 0; | |
3380 | ||
3381 | if (!namelist) | |
3382 | return -ENOMEM; | |
3383 | ||
3384 | for (j = 0; j < npevs && !ret; j++) { | |
3385 | pev = &pevs[j]; | |
3386 | for (i = 0; i < pev->ntevs && !ret; i++) { | |
3387 | tev = &pev->tevs[i]; | |
3388 | /* Skip if the symbol is out of .text or blacklisted */ | |
3389 | if (!tev->point.symbol && !pev->uprobes) | |
3390 | continue; | |
3391 | ||
3392 | /* Set new name for tev (and update namelist) */ | |
3393 | ret = probe_trace_event__set_name(tev, pev, | |
3394 | namelist, true); | |
3395 | if (!ret) | |
3396 | ret = show_probe_trace_event(tev); | |
3397 | } | |
3398 | } | |
3399 | strlist__delete(namelist); | |
3400 | ||
3401 | return ret; | |
3402 | } | |
3403 | ||
12fae5ef | 3404 | int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
3405 | { |
3406 | int i, ret = 0; | |
3407 | ||
4235b045 | 3408 | /* Loop 2: add all events */ |
8635bf6e | 3409 | for (i = 0; i < npevs; i++) { |
12fae5ef WN |
3410 | ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, |
3411 | pevs[i].ntevs, | |
ddb2f58f | 3412 | probe_conf.force_add); |
fbee632d ACM |
3413 | if (ret < 0) |
3414 | break; | |
3415 | } | |
844dffa5 NK |
3416 | return ret; |
3417 | } | |
3418 | ||
12fae5ef | 3419 | void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
3420 | { |
3421 | int i, j; | |
544abd44 | 3422 | struct perf_probe_event *pev; |
844dffa5 | 3423 | |
449e5b24 MH |
3424 | /* Loop 3: cleanup and free trace events */ |
3425 | for (i = 0; i < npevs; i++) { | |
544abd44 | 3426 | pev = &pevs[i]; |
12fae5ef WN |
3427 | for (j = 0; j < pevs[i].ntevs; j++) |
3428 | clear_probe_trace_event(&pevs[i].tevs[j]); | |
3429 | zfree(&pevs[i].tevs); | |
3430 | pevs[i].ntevs = 0; | |
544abd44 | 3431 | nsinfo__zput(pev->nsi); |
a43aac29 | 3432 | clear_perf_probe_event(&pevs[i]); |
449e5b24 | 3433 | } |
844dffa5 NK |
3434 | } |
3435 | ||
3436 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) | |
3437 | { | |
3438 | int ret; | |
844dffa5 | 3439 | |
9bae1e8c NK |
3440 | ret = init_probe_symbol_maps(pevs->uprobes); |
3441 | if (ret < 0) | |
3442 | return ret; | |
3443 | ||
12fae5ef | 3444 | ret = convert_perf_probe_events(pevs, npevs); |
844dffa5 | 3445 | if (ret == 0) |
12fae5ef | 3446 | ret = apply_perf_probe_events(pevs, npevs); |
844dffa5 | 3447 | |
12fae5ef | 3448 | cleanup_perf_probe_events(pevs, npevs); |
146a1439 | 3449 | |
9bae1e8c | 3450 | exit_probe_symbol_maps(); |
146a1439 | 3451 | return ret; |
e0faa8d3 MH |
3452 | } |
3453 | ||
307a464b | 3454 | int del_perf_probe_events(struct strfilter *filter) |
fa28244d | 3455 | { |
307a464b | 3456 | int ret, ret2, ufd = -1, kfd = -1; |
307a464b MH |
3457 | char *str = strfilter__string(filter); |
3458 | ||
3459 | if (!str) | |
3460 | return -EINVAL; | |
3461 | ||
fa28244d | 3462 | /* Get current event names */ |
92f6c72e MH |
3463 | ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); |
3464 | if (ret < 0) | |
3465 | goto out; | |
467ec085 | 3466 | |
92f6c72e | 3467 | ret = probe_file__del_events(kfd, filter); |
307a464b | 3468 | if (ret < 0 && ret != -ENOENT) |
225466f1 | 3469 | goto error; |
225466f1 | 3470 | |
92f6c72e | 3471 | ret2 = probe_file__del_events(ufd, filter); |
dddc7ee3 | 3472 | if (ret2 < 0 && ret2 != -ENOENT) { |
307a464b | 3473 | ret = ret2; |
dddc7ee3 MH |
3474 | goto error; |
3475 | } | |
dddc7ee3 | 3476 | ret = 0; |
225466f1 SD |
3477 | |
3478 | error: | |
92f6c72e | 3479 | if (kfd >= 0) |
225466f1 | 3480 | close(kfd); |
92f6c72e | 3481 | if (ufd >= 0) |
225466f1 | 3482 | close(ufd); |
92f6c72e | 3483 | out: |
307a464b | 3484 | free(str); |
146a1439 MH |
3485 | |
3486 | return ret; | |
fa28244d | 3487 | } |
225466f1 | 3488 | |
544abd44 KJ |
3489 | int show_available_funcs(const char *target, struct nsinfo *nsi, |
3490 | struct strfilter *_filter, bool user) | |
e80711ca | 3491 | { |
fd227598 | 3492 | struct rb_node *nd; |
e80711ca MH |
3493 | struct map *map; |
3494 | int ret; | |
3495 | ||
9bae1e8c | 3496 | ret = init_probe_symbol_maps(user); |
e80711ca MH |
3497 | if (ret < 0) |
3498 | return ret; | |
3499 | ||
2df58634 | 3500 | /* Get a symbol map */ |
544abd44 | 3501 | map = get_target_map(target, nsi, user); |
e80711ca | 3502 | if (!map) { |
2df58634 | 3503 | pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); |
e80711ca MH |
3504 | return -EINVAL; |
3505 | } | |
225466f1 | 3506 | |
be39db9f | 3507 | ret = map__load(map); |
e7049342 MH |
3508 | if (ret) { |
3509 | if (ret == -2) { | |
3510 | char *str = strfilter__string(_filter); | |
3511 | pr_err("Failed to find symbols matched to \"%s\"\n", | |
3512 | str); | |
3513 | free(str); | |
3514 | } else | |
3515 | pr_err("Failed to load symbols in %s\n", | |
3516 | (target) ? : "kernel"); | |
2df58634 MH |
3517 | goto end; |
3518 | } | |
3183f8ca ACM |
3519 | if (!dso__sorted_by_name(map->dso)) |
3520 | dso__sort_by_name(map->dso); | |
225466f1 | 3521 | |
2df58634 MH |
3522 | /* Show all (filtered) symbols */ |
3523 | setup_pager(); | |
fd227598 | 3524 | |
7137ff50 DB |
3525 | for (nd = rb_first_cached(&map->dso->symbol_names); nd; |
3526 | nd = rb_next(nd)) { | |
fd227598 ACM |
3527 | struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); |
3528 | ||
3529 | if (strfilter__compare(_filter, pos->sym.name)) | |
3530 | printf("%s\n", pos->sym.name); | |
3183f8ca | 3531 | } |
2df58634 | 3532 | end: |
eebc509b | 3533 | map__put(map); |
9bae1e8c | 3534 | exit_probe_symbol_maps(); |
225466f1 | 3535 | |
2df58634 | 3536 | return ret; |
225466f1 SD |
3537 | } |
3538 | ||
da15bd9d WN |
3539 | int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, |
3540 | struct perf_probe_arg *pvar) | |
3541 | { | |
3542 | tvar->value = strdup(pvar->var); | |
3543 | if (tvar->value == NULL) | |
3544 | return -ENOMEM; | |
3545 | if (pvar->type) { | |
3546 | tvar->type = strdup(pvar->type); | |
3547 | if (tvar->type == NULL) | |
3548 | return -ENOMEM; | |
3549 | } | |
3550 | if (pvar->name) { | |
3551 | tvar->name = strdup(pvar->name); | |
3552 | if (tvar->name == NULL) | |
3553 | return -ENOMEM; | |
3554 | } else | |
3555 | tvar->name = NULL; | |
3556 | return 0; | |
3557 | } |