Commit | Line | Data |
---|---|---|
50656eec | 1 | /* |
0e60836b | 2 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
3 | * |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
50656eec MH |
22 | #include <sys/utsname.h> |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
4de189fe MH |
31 | #include <stdarg.h> |
32 | #include <limits.h> | |
e80711ca | 33 | #include <elf.h> |
50656eec | 34 | |
31facc5f | 35 | #include "util.h" |
50656eec | 36 | #include "event.h" |
4de189fe | 37 | #include "strlist.h" |
50656eec | 38 | #include "debug.h" |
72041334 | 39 | #include "cache.h" |
631c9def | 40 | #include "color.h" |
e0faa8d3 MH |
41 | #include "symbol.h" |
42 | #include "thread.h" | |
4605eab3 | 43 | #include <api/fs/fs.h> |
1d037ca1 | 44 | #include "trace-event.h" /* For __maybe_unused */ |
50656eec | 45 | #include "probe-event.h" |
4235b045 | 46 | #include "probe-finder.h" |
92f6c72e | 47 | #include "probe-file.h" |
225466f1 | 48 | #include "session.h" |
50656eec MH |
49 | |
50 | #define MAX_CMDLEN 256 | |
50656eec MH |
51 | #define PERFPROBE_GROUP "probe" |
52 | ||
f4d7da49 | 53 | bool probe_event_dry_run; /* Dry run flag */ |
ddb2f58f | 54 | struct probe_conf probe_conf; |
f4d7da49 | 55 | |
146a1439 | 56 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 57 | |
92f6c72e | 58 | int e_snprintf(char *str, size_t size, const char *format, ...) |
4de189fe MH |
59 | { |
60 | int ret; | |
61 | va_list ap; | |
62 | va_start(ap, format); | |
63 | ret = vsnprintf(str, size, format, ap); | |
64 | va_end(ap); | |
65 | if (ret >= (int)size) | |
66 | ret = -E2BIG; | |
67 | return ret; | |
68 | } | |
69 | ||
ee45b6c2 | 70 | static struct machine *host_machine; |
e0faa8d3 | 71 | |
469b9b88 | 72 | /* Initialize symbol maps and path of vmlinux/modules */ |
9bae1e8c | 73 | int init_probe_symbol_maps(bool user_only) |
e0faa8d3 | 74 | { |
146a1439 MH |
75 | int ret; |
76 | ||
e0faa8d3 | 77 | symbol_conf.sort_by_name = true; |
680d926a | 78 | symbol_conf.allow_aliases = true; |
0a7e6d1b | 79 | ret = symbol__init(NULL); |
146a1439 MH |
80 | if (ret < 0) { |
81 | pr_debug("Failed to init symbol map.\n"); | |
82 | goto out; | |
83 | } | |
e0faa8d3 | 84 | |
ee45b6c2 MH |
85 | if (host_machine || user_only) /* already initialized */ |
86 | return 0; | |
d28c6223 | 87 | |
ee45b6c2 MH |
88 | if (symbol_conf.vmlinux_name) |
89 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
90 | ||
91 | host_machine = machine__new_host(); | |
92 | if (!host_machine) { | |
93 | pr_debug("machine__new_host() failed.\n"); | |
94 | symbol__exit(); | |
95 | ret = -1; | |
469b9b88 | 96 | } |
146a1439 MH |
97 | out: |
98 | if (ret < 0) | |
99 | pr_warning("Failed to init vmlinux path.\n"); | |
100 | return ret; | |
e0faa8d3 MH |
101 | } |
102 | ||
9bae1e8c | 103 | void exit_probe_symbol_maps(void) |
ee45b6c2 | 104 | { |
32ca678d ACM |
105 | machine__delete(host_machine); |
106 | host_machine = NULL; | |
ee45b6c2 MH |
107 | symbol__exit(); |
108 | } | |
109 | ||
469b9b88 MH |
110 | static struct symbol *__find_kernel_function_by_name(const char *name, |
111 | struct map **mapp) | |
112 | { | |
ee45b6c2 | 113 | return machine__find_kernel_function_by_name(host_machine, name, mapp, |
469b9b88 MH |
114 | NULL); |
115 | } | |
116 | ||
8f33f7de MH |
117 | static struct symbol *__find_kernel_function(u64 addr, struct map **mapp) |
118 | { | |
119 | return machine__find_kernel_function(host_machine, addr, mapp, NULL); | |
120 | } | |
121 | ||
122 | static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void) | |
123 | { | |
124 | /* kmap->ref_reloc_sym should be set if host_machine is initialized */ | |
125 | struct kmap *kmap; | |
a5e813c6 | 126 | struct map *map = machine__kernel_map(host_machine); |
8f33f7de | 127 | |
77e65977 | 128 | if (map__load(map, NULL) < 0) |
8f33f7de MH |
129 | return NULL; |
130 | ||
77e65977 | 131 | kmap = map__kmap(map); |
ba92732e WN |
132 | if (!kmap) |
133 | return NULL; | |
8f33f7de MH |
134 | return kmap->ref_reloc_sym; |
135 | } | |
136 | ||
9b239a12 MH |
137 | static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, |
138 | bool reloc, bool reladdr) | |
8f33f7de MH |
139 | { |
140 | struct ref_reloc_sym *reloc_sym; | |
141 | struct symbol *sym; | |
142 | struct map *map; | |
143 | ||
144 | /* ref_reloc_sym is just a label. Need a special fix*/ | |
145 | reloc_sym = kernel_get_ref_reloc_sym(); | |
146 | if (reloc_sym && strcmp(name, reloc_sym->name) == 0) | |
9b239a12 | 147 | *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr; |
8f33f7de MH |
148 | else { |
149 | sym = __find_kernel_function_by_name(name, &map); | |
9b239a12 MH |
150 | if (!sym) |
151 | return -ENOENT; | |
152 | *addr = map->unmap_ip(map, sym->start) - | |
153 | ((reloc) ? 0 : map->reloc) - | |
154 | ((reladdr) ? map->start : 0); | |
8f33f7de MH |
155 | } |
156 | return 0; | |
157 | } | |
158 | ||
e80711ca MH |
159 | static struct map *kernel_get_module_map(const char *module) |
160 | { | |
ee45b6c2 | 161 | struct map_groups *grp = &host_machine->kmaps; |
1eee78ae | 162 | struct maps *maps = &grp->maps[MAP__FUNCTION]; |
4bb7123d | 163 | struct map *pos; |
e80711ca | 164 | |
14a8fd7c MH |
165 | /* A file path -- this is an offline module */ |
166 | if (module && strchr(module, '/')) | |
9f2de315 | 167 | return machine__findnew_module_map(host_machine, 0, module); |
14a8fd7c | 168 | |
e80711ca MH |
169 | if (!module) |
170 | module = "kernel"; | |
171 | ||
4bb7123d | 172 | for (pos = maps__first(maps); pos; pos = map__next(pos)) { |
e80711ca MH |
173 | if (strncmp(pos->dso->short_name + 1, module, |
174 | pos->dso->short_name_len - 2) == 0) { | |
175 | return pos; | |
176 | } | |
177 | } | |
178 | return NULL; | |
179 | } | |
180 | ||
9b118aca MH |
181 | static struct map *get_target_map(const char *target, bool user) |
182 | { | |
183 | /* Init maps of given executable or kernel */ | |
184 | if (user) | |
185 | return dso__new_map(target); | |
186 | else | |
187 | return kernel_get_module_map(target); | |
188 | } | |
189 | ||
190 | static void put_target_map(struct map *map, bool user) | |
191 | { | |
192 | if (map && user) { | |
193 | /* Only the user map needs to be released */ | |
84c2cafa | 194 | map__put(map); |
9b118aca MH |
195 | } |
196 | } | |
197 | ||
198 | ||
fb7345bb MH |
199 | static int convert_exec_to_group(const char *exec, char **result) |
200 | { | |
201 | char *ptr1, *ptr2, *exec_copy; | |
202 | char buf[64]; | |
203 | int ret; | |
204 | ||
205 | exec_copy = strdup(exec); | |
206 | if (!exec_copy) | |
207 | return -ENOMEM; | |
208 | ||
209 | ptr1 = basename(exec_copy); | |
210 | if (!ptr1) { | |
211 | ret = -EINVAL; | |
212 | goto out; | |
213 | } | |
214 | ||
215 | ptr2 = strpbrk(ptr1, "-._"); | |
216 | if (ptr2) | |
217 | *ptr2 = '\0'; | |
218 | ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); | |
219 | if (ret < 0) | |
220 | goto out; | |
221 | ||
222 | *result = strdup(buf); | |
223 | ret = *result ? 0 : -ENOMEM; | |
224 | ||
225 | out: | |
226 | free(exec_copy); | |
227 | return ret; | |
228 | } | |
229 | ||
9b118aca MH |
230 | static void clear_perf_probe_point(struct perf_probe_point *pp) |
231 | { | |
232 | free(pp->file); | |
233 | free(pp->function); | |
234 | free(pp->lazy_line); | |
235 | } | |
236 | ||
eb948e50 MH |
237 | static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) |
238 | { | |
239 | int i; | |
240 | ||
241 | for (i = 0; i < ntevs; i++) | |
242 | clear_probe_trace_event(tevs + i); | |
243 | } | |
244 | ||
b031220d MH |
245 | static bool kprobe_blacklist__listed(unsigned long address); |
246 | static bool kprobe_warn_out_range(const char *symbol, unsigned long address) | |
247 | { | |
9b239a12 MH |
248 | u64 etext_addr = 0; |
249 | int ret; | |
7c31bb8c | 250 | |
b031220d | 251 | /* Get the address of _etext for checking non-probable text symbol */ |
9b239a12 MH |
252 | ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, |
253 | false, false); | |
7c31bb8c | 254 | |
9b239a12 | 255 | if (ret == 0 && etext_addr < address) |
b031220d MH |
256 | pr_warning("%s is out of .text, skip it.\n", symbol); |
257 | else if (kprobe_blacklist__listed(address)) | |
258 | pr_warning("%s is blacklisted function, skip it.\n", symbol); | |
259 | else | |
260 | return false; | |
261 | ||
262 | return true; | |
263 | } | |
264 | ||
c61fb959 RB |
265 | /* |
266 | * NOTE: | |
267 | * '.gnu.linkonce.this_module' section of kernel module elf directly | |
268 | * maps to 'struct module' from linux/module.h. This section contains | |
269 | * actual module name which will be used by kernel after loading it. | |
270 | * But, we cannot use 'struct module' here since linux/module.h is not | |
271 | * exposed to user-space. Offset of 'name' has remained same from long | |
272 | * time, so hardcoding it here. | |
273 | */ | |
274 | #ifdef __LP64__ | |
275 | #define MOD_NAME_OFFSET 24 | |
276 | #else | |
277 | #define MOD_NAME_OFFSET 12 | |
278 | #endif | |
279 | ||
280 | /* | |
281 | * @module can be module name of module file path. In case of path, | |
282 | * inspect elf and find out what is actual module name. | |
283 | * Caller has to free mod_name after using it. | |
284 | */ | |
285 | static char *find_module_name(const char *module) | |
286 | { | |
287 | int fd; | |
288 | Elf *elf; | |
289 | GElf_Ehdr ehdr; | |
290 | GElf_Shdr shdr; | |
291 | Elf_Data *data; | |
292 | Elf_Scn *sec; | |
293 | char *mod_name = NULL; | |
294 | ||
295 | fd = open(module, O_RDONLY); | |
296 | if (fd < 0) | |
297 | return NULL; | |
298 | ||
299 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
300 | if (elf == NULL) | |
301 | goto elf_err; | |
302 | ||
303 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
304 | goto ret_err; | |
305 | ||
306 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
307 | ".gnu.linkonce.this_module", NULL); | |
308 | if (!sec) | |
309 | goto ret_err; | |
310 | ||
311 | data = elf_getdata(sec, NULL); | |
312 | if (!data || !data->d_buf) | |
313 | goto ret_err; | |
314 | ||
315 | mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET); | |
316 | ||
317 | ret_err: | |
318 | elf_end(elf); | |
319 | elf_err: | |
320 | close(fd); | |
321 | return mod_name; | |
322 | } | |
323 | ||
89fe808a | 324 | #ifdef HAVE_DWARF_SUPPORT |
60fb7742 WN |
325 | |
326 | static int kernel_get_module_dso(const char *module, struct dso **pdso) | |
327 | { | |
328 | struct dso *dso; | |
329 | struct map *map; | |
330 | const char *vmlinux_name; | |
331 | int ret = 0; | |
332 | ||
333 | if (module) { | |
266fa2b2 ACM |
334 | char module_name[128]; |
335 | ||
336 | snprintf(module_name, sizeof(module_name), "[%s]", module); | |
337 | map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name); | |
338 | if (map) { | |
339 | dso = map->dso; | |
340 | goto found; | |
60fb7742 WN |
341 | } |
342 | pr_debug("Failed to find module %s.\n", module); | |
343 | return -ENOENT; | |
344 | } | |
345 | ||
a5e813c6 | 346 | map = machine__kernel_map(host_machine); |
60fb7742 WN |
347 | dso = map->dso; |
348 | ||
349 | vmlinux_name = symbol_conf.vmlinux_name; | |
350 | dso->load_errno = 0; | |
351 | if (vmlinux_name) | |
352 | ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL); | |
353 | else | |
354 | ret = dso__load_vmlinux_path(dso, map, NULL); | |
355 | found: | |
356 | *pdso = dso; | |
357 | return ret; | |
358 | } | |
359 | ||
9b118aca MH |
360 | /* |
361 | * Some binaries like glibc have special symbols which are on the symbol | |
362 | * table, but not in the debuginfo. If we can find the address of the | |
363 | * symbol from map, we can translate the address back to the probe point. | |
364 | */ | |
365 | static int find_alternative_probe_point(struct debuginfo *dinfo, | |
366 | struct perf_probe_point *pp, | |
367 | struct perf_probe_point *result, | |
368 | const char *target, bool uprobes) | |
369 | { | |
370 | struct map *map = NULL; | |
371 | struct symbol *sym; | |
372 | u64 address = 0; | |
373 | int ret = -ENOENT; | |
374 | ||
375 | /* This can work only for function-name based one */ | |
376 | if (!pp->function || pp->file) | |
377 | return -ENOTSUP; | |
378 | ||
379 | map = get_target_map(target, uprobes); | |
380 | if (!map) | |
381 | return -EINVAL; | |
382 | ||
383 | /* Find the address of given function */ | |
384 | map__for_each_symbol_by_name(map, pp->function, sym) { | |
e6d7c91c MH |
385 | if (uprobes) |
386 | address = sym->start; | |
387 | else | |
388 | address = map->unmap_ip(map, sym->start); | |
e578da3b | 389 | break; |
9b118aca MH |
390 | } |
391 | if (!address) { | |
392 | ret = -ENOENT; | |
393 | goto out; | |
394 | } | |
f6c15621 WN |
395 | pr_debug("Symbol %s address found : %" PRIx64 "\n", |
396 | pp->function, address); | |
9b118aca MH |
397 | |
398 | ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, | |
399 | result); | |
400 | if (ret <= 0) | |
401 | ret = (!ret) ? -ENOENT : ret; | |
402 | else { | |
403 | result->offset += pp->offset; | |
404 | result->line += pp->line; | |
9d7b45c5 | 405 | result->retprobe = pp->retprobe; |
9b118aca MH |
406 | ret = 0; |
407 | } | |
408 | ||
409 | out: | |
410 | put_target_map(map, uprobes); | |
411 | return ret; | |
412 | ||
413 | } | |
414 | ||
415 | static int get_alternative_probe_event(struct debuginfo *dinfo, | |
416 | struct perf_probe_event *pev, | |
44225521 | 417 | struct perf_probe_point *tmp) |
9b118aca MH |
418 | { |
419 | int ret; | |
420 | ||
421 | memcpy(tmp, &pev->point, sizeof(*tmp)); | |
422 | memset(&pev->point, 0, sizeof(pev->point)); | |
423 | ret = find_alternative_probe_point(dinfo, tmp, &pev->point, | |
44225521 | 424 | pev->target, pev->uprobes); |
9b118aca MH |
425 | if (ret < 0) |
426 | memcpy(&pev->point, tmp, sizeof(*tmp)); | |
427 | ||
428 | return ret; | |
429 | } | |
a15ad2f5 | 430 | |
811dd2ae MH |
431 | static int get_alternative_line_range(struct debuginfo *dinfo, |
432 | struct line_range *lr, | |
433 | const char *target, bool user) | |
434 | { | |
6d4a4896 DA |
435 | struct perf_probe_point pp = { .function = lr->function, |
436 | .file = lr->file, | |
437 | .line = lr->start }; | |
438 | struct perf_probe_point result; | |
811dd2ae MH |
439 | int ret, len = 0; |
440 | ||
6d4a4896 DA |
441 | memset(&result, 0, sizeof(result)); |
442 | ||
811dd2ae MH |
443 | if (lr->end != INT_MAX) |
444 | len = lr->end - lr->start; | |
445 | ret = find_alternative_probe_point(dinfo, &pp, &result, | |
446 | target, user); | |
447 | if (!ret) { | |
448 | lr->function = result.function; | |
449 | lr->file = result.file; | |
450 | lr->start = result.line; | |
451 | if (lr->end != INT_MAX) | |
452 | lr->end = lr->start + len; | |
453 | clear_perf_probe_point(&pp); | |
454 | } | |
455 | return ret; | |
456 | } | |
457 | ||
ff741783 | 458 | /* Open new debuginfo of given module */ |
92561cb7 | 459 | static struct debuginfo *open_debuginfo(const char *module, bool silent) |
e0faa8d3 | 460 | { |
a15ad2f5 | 461 | const char *path = module; |
419e8738 MH |
462 | char reason[STRERR_BUFSIZE]; |
463 | struct debuginfo *ret = NULL; | |
464 | struct dso *dso = NULL; | |
465 | int err; | |
ff741783 | 466 | |
a15ad2f5 | 467 | if (!module || !strchr(module, '/')) { |
419e8738 MH |
468 | err = kernel_get_module_dso(module, &dso); |
469 | if (err < 0) { | |
470 | if (!dso || dso->load_errno == 0) { | |
471 | if (!strerror_r(-err, reason, STRERR_BUFSIZE)) | |
472 | strcpy(reason, "(unknown)"); | |
473 | } else | |
474 | dso__strerror_load(dso, reason, STRERR_BUFSIZE); | |
92561cb7 | 475 | if (!silent) |
419e8738 MH |
476 | pr_err("Failed to find the path for %s: %s\n", |
477 | module ?: "kernel", reason); | |
14a8fd7c MH |
478 | return NULL; |
479 | } | |
419e8738 | 480 | path = dso->long_name; |
e0faa8d3 | 481 | } |
92561cb7 MH |
482 | ret = debuginfo__new(path); |
483 | if (!ret && !silent) { | |
484 | pr_warning("The %s file has no debug information.\n", path); | |
485 | if (!module || !strtailcmp(path, ".ko")) | |
486 | pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); | |
487 | else | |
488 | pr_warning("Rebuild with -g, "); | |
489 | pr_warning("or install an appropriate debuginfo package.\n"); | |
490 | } | |
491 | return ret; | |
e0faa8d3 | 492 | } |
4b4da7f7 | 493 | |
7737af01 MH |
494 | /* For caching the last debuginfo */ |
495 | static struct debuginfo *debuginfo_cache; | |
496 | static char *debuginfo_cache_path; | |
497 | ||
498 | static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) | |
499 | { | |
20f49859 MH |
500 | const char *path = module; |
501 | ||
502 | /* If the module is NULL, it should be the kernel. */ | |
503 | if (!module) | |
504 | path = "kernel"; | |
505 | ||
506 | if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) | |
7737af01 MH |
507 | goto out; |
508 | ||
509 | /* Copy module path */ | |
510 | free(debuginfo_cache_path); | |
20f49859 MH |
511 | debuginfo_cache_path = strdup(path); |
512 | if (!debuginfo_cache_path) { | |
513 | debuginfo__delete(debuginfo_cache); | |
514 | debuginfo_cache = NULL; | |
515 | goto out; | |
7737af01 MH |
516 | } |
517 | ||
518 | debuginfo_cache = open_debuginfo(module, silent); | |
519 | if (!debuginfo_cache) | |
520 | zfree(&debuginfo_cache_path); | |
521 | out: | |
522 | return debuginfo_cache; | |
523 | } | |
524 | ||
525 | static void debuginfo_cache__exit(void) | |
526 | { | |
527 | debuginfo__delete(debuginfo_cache); | |
528 | debuginfo_cache = NULL; | |
529 | zfree(&debuginfo_cache_path); | |
530 | } | |
531 | ||
92561cb7 | 532 | |
99ca4233 MH |
533 | static int get_text_start_address(const char *exec, unsigned long *address) |
534 | { | |
535 | Elf *elf; | |
536 | GElf_Ehdr ehdr; | |
537 | GElf_Shdr shdr; | |
538 | int fd, ret = -ENOENT; | |
539 | ||
540 | fd = open(exec, O_RDONLY); | |
541 | if (fd < 0) | |
542 | return -errno; | |
543 | ||
544 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
062d6c2a MH |
545 | if (elf == NULL) { |
546 | ret = -EINVAL; | |
547 | goto out_close; | |
548 | } | |
99ca4233 MH |
549 | |
550 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
551 | goto out; | |
552 | ||
553 | if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) | |
554 | goto out; | |
555 | ||
556 | *address = shdr.sh_addr - shdr.sh_offset; | |
557 | ret = 0; | |
558 | out: | |
559 | elf_end(elf); | |
062d6c2a MH |
560 | out_close: |
561 | close(fd); | |
562 | ||
99ca4233 MH |
563 | return ret; |
564 | } | |
565 | ||
5a6f6314 MH |
566 | /* |
567 | * Convert trace point to probe point with debuginfo | |
568 | */ | |
569 | static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, | |
570 | struct perf_probe_point *pp, | |
571 | bool is_kprobe) | |
572 | { | |
573 | struct debuginfo *dinfo = NULL; | |
574 | unsigned long stext = 0; | |
575 | u64 addr = tp->address; | |
576 | int ret = -ENOENT; | |
577 | ||
578 | /* convert the address to dwarf address */ | |
579 | if (!is_kprobe) { | |
580 | if (!addr) { | |
581 | ret = -EINVAL; | |
582 | goto error; | |
583 | } | |
584 | ret = get_text_start_address(tp->module, &stext); | |
585 | if (ret < 0) | |
586 | goto error; | |
587 | addr += stext; | |
e486367f | 588 | } else if (tp->symbol) { |
9b239a12 MH |
589 | /* If the module is given, this returns relative address */ |
590 | ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, | |
591 | false, !!tp->module); | |
592 | if (ret != 0) | |
5a6f6314 MH |
593 | goto error; |
594 | addr += tp->offset; | |
595 | } | |
596 | ||
597 | pr_debug("try to find information at %" PRIx64 " in %s\n", addr, | |
598 | tp->module ? : "kernel"); | |
599 | ||
7737af01 MH |
600 | dinfo = debuginfo_cache__open(tp->module, verbose == 0); |
601 | if (dinfo) | |
5a6f6314 MH |
602 | ret = debuginfo__find_probe_point(dinfo, |
603 | (unsigned long)addr, pp); | |
7737af01 | 604 | else |
5a6f6314 | 605 | ret = -ENOENT; |
5a6f6314 MH |
606 | |
607 | if (ret > 0) { | |
608 | pp->retprobe = tp->retprobe; | |
609 | return 0; | |
610 | } | |
611 | error: | |
612 | pr_debug("Failed to find corresponding probes from debuginfo.\n"); | |
613 | return ret ? : -ENOENT; | |
614 | } | |
615 | ||
fb7345bb MH |
616 | static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, |
617 | int ntevs, const char *exec) | |
618 | { | |
619 | int i, ret = 0; | |
eb948e50 | 620 | unsigned long stext = 0; |
fb7345bb MH |
621 | |
622 | if (!exec) | |
623 | return 0; | |
624 | ||
625 | ret = get_text_start_address(exec, &stext); | |
626 | if (ret < 0) | |
627 | return ret; | |
628 | ||
629 | for (i = 0; i < ntevs && ret >= 0; i++) { | |
981a2379 | 630 | /* point.address is the addres of point.symbol + point.offset */ |
eb948e50 | 631 | tevs[i].point.address -= stext; |
fb7345bb | 632 | tevs[i].point.module = strdup(exec); |
eb948e50 | 633 | if (!tevs[i].point.module) { |
fb7345bb MH |
634 | ret = -ENOMEM; |
635 | break; | |
636 | } | |
637 | tevs[i].uprobes = true; | |
638 | } | |
639 | ||
640 | return ret; | |
641 | } | |
642 | ||
190b57fc MH |
643 | static int add_module_to_probe_trace_events(struct probe_trace_event *tevs, |
644 | int ntevs, const char *module) | |
645 | { | |
14a8fd7c | 646 | int i, ret = 0; |
63a29613 | 647 | char *mod_name = NULL; |
14a8fd7c MH |
648 | |
649 | if (!module) | |
650 | return 0; | |
651 | ||
63a29613 | 652 | mod_name = find_module_name(module); |
14a8fd7c | 653 | |
190b57fc | 654 | for (i = 0; i < ntevs; i++) { |
63a29613 RB |
655 | tevs[i].point.module = |
656 | strdup(mod_name ? mod_name : module); | |
14a8fd7c MH |
657 | if (!tevs[i].point.module) { |
658 | ret = -ENOMEM; | |
659 | break; | |
660 | } | |
190b57fc | 661 | } |
14a8fd7c | 662 | |
63a29613 | 663 | free(mod_name); |
14a8fd7c | 664 | return ret; |
190b57fc MH |
665 | } |
666 | ||
dfef99cd MH |
667 | /* Post processing the probe events */ |
668 | static int post_process_probe_trace_events(struct probe_trace_event *tevs, | |
669 | int ntevs, const char *module, | |
670 | bool uprobe) | |
671 | { | |
672 | struct ref_reloc_sym *reloc_sym; | |
673 | char *tmp; | |
5a51fcd1 | 674 | int i, skipped = 0; |
dfef99cd MH |
675 | |
676 | if (uprobe) | |
677 | return add_exec_to_probe_trace_events(tevs, ntevs, module); | |
678 | ||
679 | /* Note that currently ref_reloc_sym based probe is not for drivers */ | |
680 | if (module) | |
681 | return add_module_to_probe_trace_events(tevs, ntevs, module); | |
682 | ||
8f33f7de | 683 | reloc_sym = kernel_get_ref_reloc_sym(); |
dfef99cd MH |
684 | if (!reloc_sym) { |
685 | pr_warning("Relocated base symbol is not found!\n"); | |
686 | return -EINVAL; | |
687 | } | |
688 | ||
689 | for (i = 0; i < ntevs; i++) { | |
b031220d MH |
690 | if (!tevs[i].point.address || tevs[i].point.retprobe) |
691 | continue; | |
692 | /* If we found a wrong one, mark it by NULL symbol */ | |
693 | if (kprobe_warn_out_range(tevs[i].point.symbol, | |
694 | tevs[i].point.address)) { | |
695 | tmp = NULL; | |
696 | skipped++; | |
697 | } else { | |
698 | tmp = strdup(reloc_sym->name); | |
699 | if (!tmp) | |
700 | return -ENOMEM; | |
dfef99cd | 701 | } |
b031220d MH |
702 | /* If we have no realname, use symbol for it */ |
703 | if (!tevs[i].point.realname) | |
704 | tevs[i].point.realname = tevs[i].point.symbol; | |
705 | else | |
706 | free(tevs[i].point.symbol); | |
707 | tevs[i].point.symbol = tmp; | |
708 | tevs[i].point.offset = tevs[i].point.address - | |
709 | reloc_sym->unrelocated_addr; | |
dfef99cd | 710 | } |
5a51fcd1 | 711 | return skipped; |
dfef99cd MH |
712 | } |
713 | ||
4b4da7f7 | 714 | /* Try to find perf_probe_event with debuginfo */ |
0e60836b | 715 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 716 | struct probe_trace_event **tevs) |
4b4da7f7 MH |
717 | { |
718 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
9b118aca | 719 | struct perf_probe_point tmp; |
225466f1 | 720 | struct debuginfo *dinfo; |
190b57fc | 721 | int ntevs, ret = 0; |
4b4da7f7 | 722 | |
44225521 | 723 | dinfo = open_debuginfo(pev->target, !need_dwarf); |
ff741783 | 724 | if (!dinfo) { |
92561cb7 | 725 | if (need_dwarf) |
ff741783 | 726 | return -ENOENT; |
ff741783 | 727 | pr_debug("Could not open debuginfo. Try to use symbols.\n"); |
4b4da7f7 MH |
728 | return 0; |
729 | } | |
730 | ||
dfef99cd | 731 | pr_debug("Try to find probe point from debuginfo.\n"); |
ff741783 | 732 | /* Searching trace events corresponding to a probe event */ |
ddb2f58f | 733 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
ff741783 | 734 | |
9b118aca | 735 | if (ntevs == 0) { /* Not found, retry with an alternative */ |
44225521 | 736 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca | 737 | if (!ret) { |
ddb2f58f | 738 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
9b118aca MH |
739 | /* |
740 | * Write back to the original probe_event for | |
741 | * setting appropriate (user given) event name | |
742 | */ | |
743 | clear_perf_probe_point(&pev->point); | |
744 | memcpy(&pev->point, &tmp, sizeof(tmp)); | |
745 | } | |
746 | } | |
747 | ||
ff741783 | 748 | debuginfo__delete(dinfo); |
4b4da7f7 | 749 | |
146a1439 | 750 | if (ntevs > 0) { /* Succeeded to find trace events */ |
dfef99cd MH |
751 | pr_debug("Found %d probe_trace_events.\n", ntevs); |
752 | ret = post_process_probe_trace_events(*tevs, ntevs, | |
44225521 | 753 | pev->target, pev->uprobes); |
5a51fcd1 | 754 | if (ret < 0 || ret == ntevs) { |
981d05ad MH |
755 | clear_probe_trace_events(*tevs, ntevs); |
756 | zfree(tevs); | |
757 | } | |
5a51fcd1 MH |
758 | if (ret != ntevs) |
759 | return ret < 0 ? ret : ntevs; | |
760 | ntevs = 0; | |
761 | /* Fall through */ | |
146a1439 | 762 | } |
4b4da7f7 | 763 | |
146a1439 | 764 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
0687eba7 | 765 | pr_warning("Probe point '%s' not found.\n", |
146a1439 | 766 | synthesize_perf_probe_point(&pev->point)); |
0687eba7 | 767 | return -ENOENT; |
146a1439 MH |
768 | } |
769 | /* Error path : ntevs < 0 */ | |
15eca306 | 770 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
1c0bd0e8 WN |
771 | if (ntevs < 0) { |
772 | if (ntevs == -EBADF) | |
773 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
774 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
15eca306 | 775 | if (!need_dwarf) { |
0e43e5d2 | 776 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
777 | return 0; |
778 | } | |
4b4da7f7 | 779 | } |
15eca306 | 780 | return ntevs; |
4b4da7f7 MH |
781 | } |
782 | ||
783 | #define LINEBUF_SIZE 256 | |
784 | #define NR_ADDITIONAL_LINES 2 | |
785 | ||
fde52dbd | 786 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 | 787 | { |
5f03cba4 | 788 | char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; |
befe3414 FBH |
789 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
790 | const char *prefix = NULL; | |
4b4da7f7 | 791 | |
befe3414 | 792 | do { |
4b4da7f7 MH |
793 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
794 | goto error; | |
befe3414 FBH |
795 | if (skip) |
796 | continue; | |
797 | if (!prefix) { | |
798 | prefix = show_num ? "%7d " : " "; | |
799 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 800 | } |
befe3414 FBH |
801 | color_fprintf(stdout, color, "%s", buf); |
802 | ||
803 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 804 | |
fde52dbd | 805 | return 1; |
4b4da7f7 | 806 | error: |
fde52dbd | 807 | if (ferror(fp)) { |
5f03cba4 MH |
808 | pr_warning("File read error: %s\n", |
809 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
fde52dbd FBH |
810 | return -1; |
811 | } | |
812 | return 0; | |
813 | } | |
146a1439 | 814 | |
fde52dbd FBH |
815 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
816 | { | |
817 | int rv = __show_one_line(fp, l, skip, show_num); | |
818 | if (rv == 0) { | |
819 | pr_warning("Source file is shorter than expected.\n"); | |
820 | rv = -1; | |
821 | } | |
822 | return rv; | |
4b4da7f7 MH |
823 | } |
824 | ||
fde52dbd FBH |
825 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
826 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
827 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
828 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
829 | ||
4b4da7f7 MH |
830 | /* |
831 | * Show line-range always requires debuginfo to find source file and | |
832 | * line number. | |
833 | */ | |
811dd2ae MH |
834 | static int __show_line_range(struct line_range *lr, const char *module, |
835 | bool user) | |
4b4da7f7 | 836 | { |
d3b63d7a | 837 | int l = 1; |
5a62257a | 838 | struct int_node *ln; |
ff741783 | 839 | struct debuginfo *dinfo; |
4b4da7f7 | 840 | FILE *fp; |
ff741783 | 841 | int ret; |
7cf0b79e | 842 | char *tmp; |
5f03cba4 | 843 | char sbuf[STRERR_BUFSIZE]; |
4b4da7f7 MH |
844 | |
845 | /* Search a line range */ | |
92561cb7 MH |
846 | dinfo = open_debuginfo(module, false); |
847 | if (!dinfo) | |
ff741783 | 848 | return -ENOENT; |
146a1439 | 849 | |
ff741783 | 850 | ret = debuginfo__find_line_range(dinfo, lr); |
811dd2ae MH |
851 | if (!ret) { /* Not found, retry with an alternative */ |
852 | ret = get_alternative_line_range(dinfo, lr, module, user); | |
853 | if (!ret) | |
854 | ret = debuginfo__find_line_range(dinfo, lr); | |
855 | } | |
ff741783 | 856 | debuginfo__delete(dinfo); |
5ee05b88 | 857 | if (ret == 0 || ret == -ENOENT) { |
146a1439 MH |
858 | pr_warning("Specified source line is not found.\n"); |
859 | return -ENOENT; | |
860 | } else if (ret < 0) { | |
5ee05b88 | 861 | pr_warning("Debuginfo analysis failed.\n"); |
146a1439 MH |
862 | return ret; |
863 | } | |
4b4da7f7 | 864 | |
7cf0b79e MH |
865 | /* Convert source file path */ |
866 | tmp = lr->path; | |
6a330a3c | 867 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
a78604de HK |
868 | |
869 | /* Free old path when new path is assigned */ | |
870 | if (tmp != lr->path) | |
871 | free(tmp); | |
872 | ||
7cf0b79e | 873 | if (ret < 0) { |
5ee05b88 | 874 | pr_warning("Failed to find source file path.\n"); |
7cf0b79e MH |
875 | return ret; |
876 | } | |
877 | ||
4b4da7f7 MH |
878 | setup_pager(); |
879 | ||
880 | if (lr->function) | |
8737ebde | 881 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
4b4da7f7 MH |
882 | lr->start - lr->offset); |
883 | else | |
62c15fc4 | 884 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
885 | |
886 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
887 | if (fp == NULL) { |
888 | pr_warning("Failed to open %s: %s\n", lr->path, | |
5f03cba4 | 889 | strerror_r(errno, sbuf, sizeof(sbuf))); |
146a1439 MH |
890 | return -errno; |
891 | } | |
4b4da7f7 | 892 | /* Skip to starting line number */ |
44b81e92 | 893 | while (l < lr->start) { |
fde52dbd | 894 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
895 | if (ret < 0) |
896 | goto end; | |
897 | } | |
4b4da7f7 | 898 | |
10daf4d0 | 899 | intlist__for_each_entry(ln, lr->line_list) { |
5a62257a | 900 | for (; ln->i > l; l++) { |
fde52dbd | 901 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
902 | if (ret < 0) |
903 | goto end; | |
904 | } | |
fde52dbd | 905 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
906 | if (ret < 0) |
907 | goto end; | |
4b4da7f7 MH |
908 | } |
909 | ||
910 | if (lr->end == INT_MAX) | |
911 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
912 | while (l <= lr->end) { |
913 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
914 | if (ret <= 0) | |
44b81e92 FBH |
915 | break; |
916 | } | |
146a1439 | 917 | end: |
4b4da7f7 | 918 | fclose(fp); |
146a1439 | 919 | return ret; |
4b4da7f7 MH |
920 | } |
921 | ||
2b394bc4 | 922 | int show_line_range(struct line_range *lr, const char *module, bool user) |
ee45b6c2 MH |
923 | { |
924 | int ret; | |
925 | ||
9bae1e8c | 926 | ret = init_probe_symbol_maps(user); |
ee45b6c2 MH |
927 | if (ret < 0) |
928 | return ret; | |
811dd2ae | 929 | ret = __show_line_range(lr, module, user); |
9bae1e8c | 930 | exit_probe_symbol_maps(); |
ee45b6c2 MH |
931 | |
932 | return ret; | |
933 | } | |
934 | ||
ff741783 MH |
935 | static int show_available_vars_at(struct debuginfo *dinfo, |
936 | struct perf_probe_event *pev, | |
ddb2f58f | 937 | struct strfilter *_filter) |
cf6eb489 MH |
938 | { |
939 | char *buf; | |
bd09d7b5 | 940 | int ret, i, nvars; |
cf6eb489 MH |
941 | struct str_node *node; |
942 | struct variable_list *vls = NULL, *vl; | |
9b118aca | 943 | struct perf_probe_point tmp; |
bd09d7b5 | 944 | const char *var; |
cf6eb489 MH |
945 | |
946 | buf = synthesize_perf_probe_point(&pev->point); | |
947 | if (!buf) | |
948 | return -EINVAL; | |
949 | pr_debug("Searching variables at %s\n", buf); | |
950 | ||
ddb2f58f | 951 | ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); |
9b118aca | 952 | if (!ret) { /* Not found, retry with an alternative */ |
44225521 | 953 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca MH |
954 | if (!ret) { |
955 | ret = debuginfo__find_available_vars_at(dinfo, pev, | |
ddb2f58f | 956 | &vls); |
9b118aca MH |
957 | /* Release the old probe_point */ |
958 | clear_perf_probe_point(&tmp); | |
959 | } | |
960 | } | |
bd09d7b5 | 961 | if (ret <= 0) { |
69e96eaa MH |
962 | if (ret == 0 || ret == -ENOENT) { |
963 | pr_err("Failed to find the address of %s\n", buf); | |
964 | ret = -ENOENT; | |
965 | } else | |
966 | pr_warning("Debuginfo analysis failed.\n"); | |
bd09d7b5 MH |
967 | goto end; |
968 | } | |
69e96eaa | 969 | |
bd09d7b5 MH |
970 | /* Some variables are found */ |
971 | fprintf(stdout, "Available variables at %s\n", buf); | |
972 | for (i = 0; i < ret; i++) { | |
973 | vl = &vls[i]; | |
974 | /* | |
975 | * A probe point might be converted to | |
976 | * several trace points. | |
977 | */ | |
978 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
979 | vl->point.offset); | |
74cf249d | 980 | zfree(&vl->point.symbol); |
bd09d7b5 MH |
981 | nvars = 0; |
982 | if (vl->vars) { | |
602a1f4d | 983 | strlist__for_each_entry(node, vl->vars) { |
bd09d7b5 MH |
984 | var = strchr(node->s, '\t') + 1; |
985 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 986 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
987 | nvars++; |
988 | } | |
989 | } | |
990 | strlist__delete(vl->vars); | |
cf6eb489 | 991 | } |
bd09d7b5 MH |
992 | if (nvars == 0) |
993 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
994 | } | |
995 | free(vls); | |
996 | end: | |
cf6eb489 MH |
997 | free(buf); |
998 | return ret; | |
999 | } | |
1000 | ||
1001 | /* Show available variables on given probe point */ | |
1002 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
ddb2f58f | 1003 | struct strfilter *_filter) |
cf6eb489 | 1004 | { |
ff741783 MH |
1005 | int i, ret = 0; |
1006 | struct debuginfo *dinfo; | |
cf6eb489 | 1007 | |
9bae1e8c | 1008 | ret = init_probe_symbol_maps(pevs->uprobes); |
cf6eb489 MH |
1009 | if (ret < 0) |
1010 | return ret; | |
1011 | ||
44225521 | 1012 | dinfo = open_debuginfo(pevs->target, false); |
ff741783 | 1013 | if (!dinfo) { |
ee45b6c2 MH |
1014 | ret = -ENOENT; |
1015 | goto out; | |
ff741783 MH |
1016 | } |
1017 | ||
cf6eb489 MH |
1018 | setup_pager(); |
1019 | ||
ff741783 | 1020 | for (i = 0; i < npevs && ret >= 0; i++) |
ddb2f58f | 1021 | ret = show_available_vars_at(dinfo, &pevs[i], _filter); |
ff741783 MH |
1022 | |
1023 | debuginfo__delete(dinfo); | |
ee45b6c2 | 1024 | out: |
9bae1e8c | 1025 | exit_probe_symbol_maps(); |
cf6eb489 MH |
1026 | return ret; |
1027 | } | |
1028 | ||
89fe808a | 1029 | #else /* !HAVE_DWARF_SUPPORT */ |
4b4da7f7 | 1030 | |
7737af01 MH |
1031 | static void debuginfo_cache__exit(void) |
1032 | { | |
1033 | } | |
1034 | ||
5a6f6314 MH |
1035 | static int |
1036 | find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, | |
1037 | struct perf_probe_point *pp __maybe_unused, | |
1038 | bool is_kprobe __maybe_unused) | |
4b4da7f7 | 1039 | { |
5a6f6314 | 1040 | return -ENOSYS; |
4b4da7f7 MH |
1041 | } |
1042 | ||
0e60836b | 1043 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 1044 | struct probe_trace_event **tevs __maybe_unused) |
4b4da7f7 | 1045 | { |
146a1439 MH |
1046 | if (perf_probe_event_need_dwarf(pev)) { |
1047 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1048 | return -ENOSYS; | |
1049 | } | |
225466f1 | 1050 | |
4b4da7f7 MH |
1051 | return 0; |
1052 | } | |
1053 | ||
1d037ca1 | 1054 | int show_line_range(struct line_range *lr __maybe_unused, |
2b394bc4 MH |
1055 | const char *module __maybe_unused, |
1056 | bool user __maybe_unused) | |
4b4da7f7 | 1057 | { |
146a1439 MH |
1058 | pr_warning("Debuginfo-analysis is not supported.\n"); |
1059 | return -ENOSYS; | |
4b4da7f7 MH |
1060 | } |
1061 | ||
1d037ca1 | 1062 | int show_available_vars(struct perf_probe_event *pevs __maybe_unused, |
ddb2f58f MH |
1063 | int npevs __maybe_unused, |
1064 | struct strfilter *filter __maybe_unused) | |
cf6eb489 MH |
1065 | { |
1066 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1067 | return -ENOSYS; | |
1068 | } | |
e0faa8d3 MH |
1069 | #endif |
1070 | ||
e53b00d3 MH |
1071 | void line_range__clear(struct line_range *lr) |
1072 | { | |
e53b00d3 MH |
1073 | free(lr->function); |
1074 | free(lr->file); | |
1075 | free(lr->path); | |
1076 | free(lr->comp_dir); | |
5a62257a | 1077 | intlist__delete(lr->line_list); |
e53b00d3 MH |
1078 | memset(lr, 0, sizeof(*lr)); |
1079 | } | |
1080 | ||
5a62257a | 1081 | int line_range__init(struct line_range *lr) |
e53b00d3 MH |
1082 | { |
1083 | memset(lr, 0, sizeof(*lr)); | |
5a62257a MH |
1084 | lr->line_list = intlist__new(NULL); |
1085 | if (!lr->line_list) | |
1086 | return -ENOMEM; | |
1087 | else | |
1088 | return 0; | |
e53b00d3 MH |
1089 | } |
1090 | ||
21dd9ae5 FBH |
1091 | static int parse_line_num(char **ptr, int *val, const char *what) |
1092 | { | |
1093 | const char *start = *ptr; | |
1094 | ||
1095 | errno = 0; | |
1096 | *val = strtol(*ptr, ptr, 0); | |
1097 | if (errno || *ptr == start) { | |
1098 | semantic_error("'%s' is not a valid number.\n", what); | |
1099 | return -EINVAL; | |
1100 | } | |
1101 | return 0; | |
1102 | } | |
1103 | ||
573709fd MH |
1104 | /* Check the name is good for event, group or function */ |
1105 | static bool is_c_func_name(const char *name) | |
1106 | { | |
1107 | if (!isalpha(*name) && *name != '_') | |
1108 | return false; | |
1109 | while (*++name != '\0') { | |
1110 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1111 | return false; | |
1112 | } | |
1113 | return true; | |
1114 | } | |
1115 | ||
9d95b580 FBH |
1116 | /* |
1117 | * Stuff 'lr' according to the line range described by 'arg'. | |
1118 | * The line range syntax is described by: | |
1119 | * | |
1120 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 1121 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 1122 | */ |
146a1439 | 1123 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 1124 | { |
e116dfa1 | 1125 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
1126 | int err; |
1127 | ||
1128 | if (!name) | |
1129 | return -ENOMEM; | |
1130 | ||
1131 | lr->start = 0; | |
1132 | lr->end = INT_MAX; | |
1133 | ||
1134 | range = strchr(name, ':'); | |
1135 | if (range) { | |
1136 | *range++ = '\0'; | |
1137 | ||
1138 | err = parse_line_num(&range, &lr->start, "start line"); | |
1139 | if (err) | |
1140 | goto err; | |
1141 | ||
1142 | if (*range == '+' || *range == '-') { | |
1143 | const char c = *range++; | |
1144 | ||
1145 | err = parse_line_num(&range, &lr->end, "end line"); | |
1146 | if (err) | |
1147 | goto err; | |
1148 | ||
1149 | if (c == '+') { | |
1150 | lr->end += lr->start; | |
1151 | /* | |
1152 | * Adjust the number of lines here. | |
1153 | * If the number of lines == 1, the | |
1154 | * the end of line should be equal to | |
1155 | * the start of line. | |
1156 | */ | |
1157 | lr->end--; | |
1158 | } | |
1159 | } | |
9d95b580 | 1160 | |
d3b63d7a | 1161 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
1162 | |
1163 | err = -EINVAL; | |
d3b63d7a | 1164 | if (lr->start > lr->end) { |
631c9def | 1165 | semantic_error("Start line must be smaller" |
146a1439 | 1166 | " than end line.\n"); |
21dd9ae5 | 1167 | goto err; |
146a1439 | 1168 | } |
21dd9ae5 FBH |
1169 | if (*range != '\0') { |
1170 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
1171 | goto err; | |
146a1439 | 1172 | } |
d3b63d7a | 1173 | } |
02b95dad | 1174 | |
e116dfa1 MH |
1175 | file = strchr(name, '@'); |
1176 | if (file) { | |
1177 | *file = '\0'; | |
1178 | lr->file = strdup(++file); | |
1179 | if (lr->file == NULL) { | |
1180 | err = -ENOMEM; | |
1181 | goto err; | |
1182 | } | |
1183 | lr->function = name; | |
573709fd | 1184 | } else if (strchr(name, '/') || strchr(name, '.')) |
21dd9ae5 | 1185 | lr->file = name; |
573709fd | 1186 | else if (is_c_func_name(name))/* We reuse it for checking funcname */ |
21dd9ae5 | 1187 | lr->function = name; |
573709fd MH |
1188 | else { /* Invalid name */ |
1189 | semantic_error("'%s' is not a valid function name.\n", name); | |
1190 | err = -EINVAL; | |
1191 | goto err; | |
1192 | } | |
146a1439 MH |
1193 | |
1194 | return 0; | |
21dd9ae5 FBH |
1195 | err: |
1196 | free(name); | |
1197 | return err; | |
631c9def MH |
1198 | } |
1199 | ||
50656eec | 1200 | /* Parse probepoint definition. */ |
146a1439 | 1201 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 1202 | { |
4235b045 | 1203 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
1204 | char *ptr, *tmp; |
1205 | char c, nc = 0; | |
3099c026 | 1206 | bool file_spec = false; |
50656eec MH |
1207 | /* |
1208 | * <Syntax> | |
8d993d96 MH |
1209 | * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] |
1210 | * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
50656eec | 1211 | */ |
e59d29e8 WN |
1212 | if (!arg) |
1213 | return -EINVAL; | |
50656eec | 1214 | |
2a9c8c36 MH |
1215 | ptr = strpbrk(arg, ";=@+%"); |
1216 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
1217 | *ptr = '\0'; |
1218 | tmp = ptr + 1; | |
8d993d96 MH |
1219 | ptr = strchr(arg, ':'); |
1220 | if (ptr) { | |
1221 | *ptr = '\0'; | |
1222 | if (!is_c_func_name(arg)) | |
1223 | goto not_fname; | |
1224 | pev->group = strdup(arg); | |
1225 | if (!pev->group) | |
1226 | return -ENOMEM; | |
1227 | arg = ptr + 1; | |
1228 | } else | |
1229 | pev->group = NULL; | |
573709fd | 1230 | if (!is_c_func_name(arg)) { |
8d993d96 | 1231 | not_fname: |
b7702a21 | 1232 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
1233 | "follow C symbol-naming rule.\n", arg); |
1234 | return -EINVAL; | |
1235 | } | |
02b95dad MH |
1236 | pev->event = strdup(arg); |
1237 | if (pev->event == NULL) | |
1238 | return -ENOMEM; | |
af663d75 MH |
1239 | arg = tmp; |
1240 | } | |
1241 | ||
3099c026 NR |
1242 | /* |
1243 | * Check arg is function or file name and copy it. | |
1244 | * | |
1245 | * We consider arg to be a file spec if and only if it satisfies | |
1246 | * all of the below criteria:: | |
1247 | * - it does not include any of "+@%", | |
1248 | * - it includes one of ":;", and | |
1249 | * - it has a period '.' in the name. | |
1250 | * | |
1251 | * Otherwise, we consider arg to be a function specification. | |
1252 | */ | |
1253 | if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) { | |
1254 | /* This is a file spec if it includes a '.' before ; or : */ | |
1255 | if (memchr(arg, '.', ptr - arg)) | |
1256 | file_spec = true; | |
1257 | } | |
1258 | ||
2a9c8c36 | 1259 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
1260 | if (ptr) { |
1261 | nc = *ptr; | |
1262 | *ptr++ = '\0'; | |
1263 | } | |
1264 | ||
6c6e024f WN |
1265 | if (arg[0] == '\0') |
1266 | tmp = NULL; | |
1267 | else { | |
1268 | tmp = strdup(arg); | |
1269 | if (tmp == NULL) | |
1270 | return -ENOMEM; | |
1271 | } | |
02b95dad | 1272 | |
3099c026 | 1273 | if (file_spec) |
02b95dad | 1274 | pp->file = tmp; |
da15bd9d | 1275 | else { |
02b95dad | 1276 | pp->function = tmp; |
50656eec | 1277 | |
da15bd9d WN |
1278 | /* |
1279 | * Keep pp->function even if this is absolute address, | |
1280 | * so it can mark whether abs_address is valid. | |
1281 | * Which make 'perf probe lib.bin 0x0' possible. | |
1282 | * | |
1283 | * Note that checking length of tmp is not needed | |
1284 | * because when we access tmp[1] we know tmp[0] is '0', | |
1285 | * so tmp[1] should always valid (but could be '\0'). | |
1286 | */ | |
1287 | if (tmp && !strncmp(tmp, "0x", 2)) { | |
1288 | pp->abs_address = strtoul(pp->function, &tmp, 0); | |
1289 | if (*tmp != '\0') { | |
1290 | semantic_error("Invalid absolute address.\n"); | |
1291 | return -EINVAL; | |
1292 | } | |
1293 | } | |
1294 | } | |
1295 | ||
50656eec MH |
1296 | /* Parse other options */ |
1297 | while (ptr) { | |
1298 | arg = ptr; | |
1299 | c = nc; | |
2a9c8c36 | 1300 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
1301 | pp->lazy_line = strdup(arg); |
1302 | if (pp->lazy_line == NULL) | |
1303 | return -ENOMEM; | |
2a9c8c36 MH |
1304 | break; |
1305 | } | |
1306 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
1307 | if (ptr) { |
1308 | nc = *ptr; | |
1309 | *ptr++ = '\0'; | |
1310 | } | |
1311 | switch (c) { | |
1312 | case ':': /* Line number */ | |
1313 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 1314 | if (*tmp != '\0') { |
2a9c8c36 | 1315 | semantic_error("There is non-digit char" |
146a1439 MH |
1316 | " in line number.\n"); |
1317 | return -EINVAL; | |
1318 | } | |
50656eec MH |
1319 | break; |
1320 | case '+': /* Byte offset from a symbol */ | |
1321 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 1322 | if (*tmp != '\0') { |
2a9c8c36 | 1323 | semantic_error("There is non-digit character" |
146a1439 MH |
1324 | " in offset.\n"); |
1325 | return -EINVAL; | |
1326 | } | |
50656eec MH |
1327 | break; |
1328 | case '@': /* File name */ | |
146a1439 MH |
1329 | if (pp->file) { |
1330 | semantic_error("SRC@SRC is not allowed.\n"); | |
1331 | return -EINVAL; | |
1332 | } | |
02b95dad MH |
1333 | pp->file = strdup(arg); |
1334 | if (pp->file == NULL) | |
1335 | return -ENOMEM; | |
50656eec MH |
1336 | break; |
1337 | case '%': /* Probe places */ | |
1338 | if (strcmp(arg, "return") == 0) { | |
1339 | pp->retprobe = 1; | |
146a1439 MH |
1340 | } else { /* Others not supported yet */ |
1341 | semantic_error("%%%s is not supported.\n", arg); | |
1342 | return -ENOTSUP; | |
1343 | } | |
50656eec | 1344 | break; |
146a1439 MH |
1345 | default: /* Buggy case */ |
1346 | pr_err("This program has a bug at %s:%d.\n", | |
1347 | __FILE__, __LINE__); | |
1348 | return -ENOTSUP; | |
50656eec MH |
1349 | break; |
1350 | } | |
1351 | } | |
1352 | ||
1353 | /* Exclusion check */ | |
146a1439 | 1354 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
1355 | semantic_error("Lazy pattern can't be used with" |
1356 | " line number.\n"); | |
146a1439 MH |
1357 | return -EINVAL; |
1358 | } | |
2a9c8c36 | 1359 | |
146a1439 | 1360 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 1361 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
1362 | return -EINVAL; |
1363 | } | |
2a9c8c36 | 1364 | |
146a1439 | 1365 | if (pp->line && pp->offset) { |
0e43e5d2 | 1366 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
1367 | return -EINVAL; |
1368 | } | |
50656eec | 1369 | |
146a1439 | 1370 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 1371 | semantic_error("File always requires line number or " |
0e43e5d2 | 1372 | "lazy pattern.\n"); |
146a1439 MH |
1373 | return -EINVAL; |
1374 | } | |
50656eec | 1375 | |
146a1439 | 1376 | if (pp->offset && !pp->function) { |
0e43e5d2 | 1377 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
1378 | return -EINVAL; |
1379 | } | |
50656eec | 1380 | |
146a1439 | 1381 | if (pp->retprobe && !pp->function) { |
0e43e5d2 | 1382 | semantic_error("Return probe requires an entry function.\n"); |
146a1439 MH |
1383 | return -EINVAL; |
1384 | } | |
50656eec | 1385 | |
146a1439 | 1386 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 1387 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 1388 | "return probe.\n"); |
146a1439 MH |
1389 | return -EINVAL; |
1390 | } | |
50656eec | 1391 | |
4235b045 | 1392 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
1393 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
1394 | pp->lazy_line); | |
146a1439 | 1395 | return 0; |
50656eec MH |
1396 | } |
1397 | ||
7df2f329 | 1398 | /* Parse perf-probe event argument */ |
146a1439 | 1399 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 1400 | { |
b2a3c12b | 1401 | char *tmp, *goodname; |
7df2f329 MH |
1402 | struct perf_probe_arg_field **fieldp; |
1403 | ||
1404 | pr_debug("parsing arg: %s into ", str); | |
1405 | ||
48481938 MH |
1406 | tmp = strchr(str, '='); |
1407 | if (tmp) { | |
02b95dad MH |
1408 | arg->name = strndup(str, tmp - str); |
1409 | if (arg->name == NULL) | |
1410 | return -ENOMEM; | |
11a1ca35 | 1411 | pr_debug("name:%s ", arg->name); |
48481938 MH |
1412 | str = tmp + 1; |
1413 | } | |
1414 | ||
11a1ca35 MH |
1415 | tmp = strchr(str, ':'); |
1416 | if (tmp) { /* Type setting */ | |
1417 | *tmp = '\0'; | |
02b95dad MH |
1418 | arg->type = strdup(tmp + 1); |
1419 | if (arg->type == NULL) | |
1420 | return -ENOMEM; | |
11a1ca35 MH |
1421 | pr_debug("type:%s ", arg->type); |
1422 | } | |
1423 | ||
b2a3c12b | 1424 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
1425 | if (!is_c_varname(str) || !tmp) { |
1426 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
1427 | arg->var = strdup(str); |
1428 | if (arg->var == NULL) | |
1429 | return -ENOMEM; | |
48481938 | 1430 | pr_debug("%s\n", arg->var); |
146a1439 | 1431 | return 0; |
7df2f329 MH |
1432 | } |
1433 | ||
b2a3c12b | 1434 | /* Structure fields or array element */ |
02b95dad MH |
1435 | arg->var = strndup(str, tmp - str); |
1436 | if (arg->var == NULL) | |
1437 | return -ENOMEM; | |
b2a3c12b | 1438 | goodname = arg->var; |
48481938 | 1439 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
1440 | fieldp = &arg->field; |
1441 | ||
1442 | do { | |
e334016f MH |
1443 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
1444 | if (*fieldp == NULL) | |
1445 | return -ENOMEM; | |
b2a3c12b MH |
1446 | if (*tmp == '[') { /* Array */ |
1447 | str = tmp; | |
1448 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 1449 | (*fieldp)->ref = true; |
b2a3c12b MH |
1450 | if (*tmp != ']' || tmp == str + 1) { |
1451 | semantic_error("Array index must be a" | |
1452 | " number.\n"); | |
1453 | return -EINVAL; | |
1454 | } | |
1455 | tmp++; | |
1456 | if (*tmp == '\0') | |
1457 | tmp = NULL; | |
1458 | } else { /* Structure */ | |
1459 | if (*tmp == '.') { | |
1460 | str = tmp + 1; | |
1461 | (*fieldp)->ref = false; | |
1462 | } else if (tmp[1] == '>') { | |
1463 | str = tmp + 2; | |
1464 | (*fieldp)->ref = true; | |
1465 | } else { | |
1466 | semantic_error("Argument parse error: %s\n", | |
1467 | str); | |
1468 | return -EINVAL; | |
1469 | } | |
1470 | tmp = strpbrk(str, "-.["); | |
146a1439 | 1471 | } |
7df2f329 | 1472 | if (tmp) { |
02b95dad MH |
1473 | (*fieldp)->name = strndup(str, tmp - str); |
1474 | if ((*fieldp)->name == NULL) | |
1475 | return -ENOMEM; | |
b2a3c12b MH |
1476 | if (*str != '[') |
1477 | goodname = (*fieldp)->name; | |
7df2f329 MH |
1478 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
1479 | fieldp = &(*fieldp)->next; | |
1480 | } | |
1481 | } while (tmp); | |
02b95dad MH |
1482 | (*fieldp)->name = strdup(str); |
1483 | if ((*fieldp)->name == NULL) | |
1484 | return -ENOMEM; | |
b2a3c12b MH |
1485 | if (*str != '[') |
1486 | goodname = (*fieldp)->name; | |
7df2f329 | 1487 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 1488 | |
b2a3c12b | 1489 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 1490 | if (!arg->name) { |
b2a3c12b | 1491 | arg->name = strdup(goodname); |
02b95dad MH |
1492 | if (arg->name == NULL) |
1493 | return -ENOMEM; | |
1494 | } | |
146a1439 | 1495 | return 0; |
7df2f329 MH |
1496 | } |
1497 | ||
4235b045 | 1498 | /* Parse perf-probe event command */ |
146a1439 | 1499 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 1500 | { |
e1c01d61 | 1501 | char **argv; |
146a1439 | 1502 | int argc, i, ret = 0; |
fac13fd5 | 1503 | |
4235b045 | 1504 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1505 | if (!argv) { |
1506 | pr_debug("Failed to split arguments.\n"); | |
1507 | return -ENOMEM; | |
1508 | } | |
1509 | if (argc - 1 > MAX_PROBE_ARGS) { | |
1510 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
1511 | ret = -ERANGE; | |
1512 | goto out; | |
1513 | } | |
50656eec | 1514 | /* Parse probe point */ |
146a1439 MH |
1515 | ret = parse_perf_probe_point(argv[0], pev); |
1516 | if (ret < 0) | |
1517 | goto out; | |
50656eec | 1518 | |
e1c01d61 | 1519 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 1520 | pev->nargs = argc - 1; |
e334016f MH |
1521 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1522 | if (pev->args == NULL) { | |
1523 | ret = -ENOMEM; | |
1524 | goto out; | |
1525 | } | |
146a1439 MH |
1526 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
1527 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
1528 | if (ret >= 0 && | |
1529 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 1530 | semantic_error("You can't specify local variable for" |
146a1439 MH |
1531 | " kretprobe.\n"); |
1532 | ret = -EINVAL; | |
1533 | } | |
e1c01d61 | 1534 | } |
146a1439 | 1535 | out: |
e1c01d61 | 1536 | argv_free(argv); |
146a1439 MH |
1537 | |
1538 | return ret; | |
50656eec MH |
1539 | } |
1540 | ||
4235b045 MH |
1541 | /* Return true if this perf_probe_event requires debuginfo */ |
1542 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
1543 | { | |
1544 | int i; | |
1545 | ||
1546 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
1547 | return true; | |
1548 | ||
1549 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 1550 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
1551 | return true; |
1552 | ||
1553 | return false; | |
1554 | } | |
1555 | ||
0e60836b | 1556 | /* Parse probe_events event into struct probe_point */ |
92f6c72e | 1557 | int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) |
4de189fe | 1558 | { |
0e60836b | 1559 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
1560 | char pr; |
1561 | char *p; | |
bcbd0040 | 1562 | char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; |
4de189fe MH |
1563 | int ret, i, argc; |
1564 | char **argv; | |
1565 | ||
0e60836b | 1566 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1567 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1568 | if (!argv) { |
1569 | pr_debug("Failed to split arguments.\n"); | |
1570 | return -ENOMEM; | |
1571 | } | |
1572 | if (argc < 2) { | |
1573 | semantic_error("Too few probe arguments.\n"); | |
1574 | ret = -ERANGE; | |
1575 | goto out; | |
1576 | } | |
4de189fe MH |
1577 | |
1578 | /* Scan event and group name. */ | |
bcbd0040 IT |
1579 | argv0_str = strdup(argv[0]); |
1580 | if (argv0_str == NULL) { | |
1581 | ret = -ENOMEM; | |
1582 | goto out; | |
1583 | } | |
1584 | fmt1_str = strtok_r(argv0_str, ":", &fmt); | |
1585 | fmt2_str = strtok_r(NULL, "/", &fmt); | |
1586 | fmt3_str = strtok_r(NULL, " \t", &fmt); | |
1587 | if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL | |
1588 | || fmt3_str == NULL) { | |
146a1439 MH |
1589 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1590 | ret = -EINVAL; | |
1591 | goto out; | |
1592 | } | |
bcbd0040 IT |
1593 | pr = fmt1_str[0]; |
1594 | tev->group = strdup(fmt2_str); | |
1595 | tev->event = strdup(fmt3_str); | |
1596 | if (tev->group == NULL || tev->event == NULL) { | |
1597 | ret = -ENOMEM; | |
1598 | goto out; | |
1599 | } | |
4235b045 | 1600 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1601 | |
4235b045 | 1602 | tp->retprobe = (pr == 'r'); |
4de189fe | 1603 | |
190b57fc MH |
1604 | /* Scan module name(if there), function name and offset */ |
1605 | p = strchr(argv[1], ':'); | |
1606 | if (p) { | |
1607 | tp->module = strndup(argv[1], p - argv[1]); | |
844faa4b MH |
1608 | if (!tp->module) { |
1609 | ret = -ENOMEM; | |
1610 | goto out; | |
1611 | } | |
190b57fc MH |
1612 | p++; |
1613 | } else | |
1614 | p = argv[1]; | |
bcbd0040 | 1615 | fmt1_str = strtok_r(p, "+", &fmt); |
be07afe9 WN |
1616 | /* only the address started with 0x */ |
1617 | if (fmt1_str[0] == '0') { | |
1618 | /* | |
1619 | * Fix a special case: | |
1620 | * if address == 0, kernel reports something like: | |
1621 | * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax | |
1622 | * Newer kernel may fix that, but we want to | |
1623 | * support old kernel also. | |
1624 | */ | |
1625 | if (strcmp(fmt1_str, "0x") == 0) { | |
1626 | if (!argv[2] || strcmp(argv[2], "(null)")) { | |
1627 | ret = -EINVAL; | |
1628 | goto out; | |
1629 | } | |
1630 | tp->address = 0; | |
1631 | ||
1632 | free(argv[2]); | |
1633 | for (i = 2; argv[i + 1] != NULL; i++) | |
1634 | argv[i] = argv[i + 1]; | |
1635 | ||
1636 | argv[i] = NULL; | |
1637 | argc -= 1; | |
1638 | } else | |
1639 | tp->address = strtoul(fmt1_str, NULL, 0); | |
1640 | } else { | |
5a6f6314 MH |
1641 | /* Only the symbol-based probe has offset */ |
1642 | tp->symbol = strdup(fmt1_str); | |
1643 | if (tp->symbol == NULL) { | |
1644 | ret = -ENOMEM; | |
1645 | goto out; | |
1646 | } | |
1647 | fmt2_str = strtok_r(NULL, "", &fmt); | |
1648 | if (fmt2_str == NULL) | |
1649 | tp->offset = 0; | |
1650 | else | |
1651 | tp->offset = strtoul(fmt2_str, NULL, 10); | |
bcbd0040 | 1652 | } |
4de189fe | 1653 | |
4235b045 | 1654 | tev->nargs = argc - 2; |
0e60836b | 1655 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1656 | if (tev->args == NULL) { |
1657 | ret = -ENOMEM; | |
1658 | goto out; | |
1659 | } | |
4235b045 | 1660 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1661 | p = strchr(argv[i + 2], '='); |
1662 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1663 | *p++ = '\0'; |
1664 | else | |
1665 | p = argv[i + 2]; | |
02b95dad | 1666 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1667 | /* TODO: parse regs and offset */ |
02b95dad MH |
1668 | tev->args[i].value = strdup(p); |
1669 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1670 | ret = -ENOMEM; | |
1671 | goto out; | |
1672 | } | |
4de189fe | 1673 | } |
146a1439 MH |
1674 | ret = 0; |
1675 | out: | |
bcbd0040 | 1676 | free(argv0_str); |
4de189fe | 1677 | argv_free(argv); |
146a1439 | 1678 | return ret; |
4de189fe MH |
1679 | } |
1680 | ||
7df2f329 | 1681 | /* Compose only probe arg */ |
909b0360 | 1682 | char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) |
7df2f329 MH |
1683 | { |
1684 | struct perf_probe_arg_field *field = pa->field; | |
909b0360 | 1685 | struct strbuf buf; |
bf4d5f25 MH |
1686 | char *ret = NULL; |
1687 | int err; | |
1688 | ||
1689 | if (strbuf_init(&buf, 64) < 0) | |
1690 | return NULL; | |
7df2f329 | 1691 | |
48481938 | 1692 | if (pa->name && pa->var) |
bf4d5f25 | 1693 | err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); |
48481938 | 1694 | else |
bf4d5f25 MH |
1695 | err = strbuf_addstr(&buf, pa->name ?: pa->var); |
1696 | if (err) | |
1697 | goto out; | |
7df2f329 MH |
1698 | |
1699 | while (field) { | |
b2a3c12b | 1700 | if (field->name[0] == '[') |
bf4d5f25 | 1701 | err = strbuf_addstr(&buf, field->name); |
b2a3c12b | 1702 | else |
bf4d5f25 MH |
1703 | err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", |
1704 | field->name); | |
7df2f329 | 1705 | field = field->next; |
bf4d5f25 MH |
1706 | if (err) |
1707 | goto out; | |
7df2f329 | 1708 | } |
11a1ca35 | 1709 | |
909b0360 | 1710 | if (pa->type) |
bf4d5f25 MH |
1711 | if (strbuf_addf(&buf, ":%s", pa->type) < 0) |
1712 | goto out; | |
909b0360 MH |
1713 | |
1714 | ret = strbuf_detach(&buf, NULL); | |
bf4d5f25 MH |
1715 | out: |
1716 | strbuf_release(&buf); | |
146a1439 | 1717 | return ret; |
7df2f329 MH |
1718 | } |
1719 | ||
4235b045 | 1720 | /* Compose only probe point (not argument) */ |
c4ff4920 | 1721 | char *synthesize_perf_probe_point(struct perf_probe_point *pp) |
4de189fe | 1722 | { |
909b0360 | 1723 | struct strbuf buf; |
bf4d5f25 MH |
1724 | char *tmp, *ret = NULL; |
1725 | int len, err = 0; | |
1726 | ||
1727 | if (strbuf_init(&buf, 64) < 0) | |
1728 | return NULL; | |
909b0360 | 1729 | |
909b0360 | 1730 | if (pp->function) { |
bf4d5f25 MH |
1731 | if (strbuf_addstr(&buf, pp->function) < 0) |
1732 | goto out; | |
909b0360 | 1733 | if (pp->offset) |
bf4d5f25 | 1734 | err = strbuf_addf(&buf, "+%lu", pp->offset); |
909b0360 | 1735 | else if (pp->line) |
bf4d5f25 | 1736 | err = strbuf_addf(&buf, ":%d", pp->line); |
909b0360 | 1737 | else if (pp->retprobe) |
bf4d5f25 MH |
1738 | err = strbuf_addstr(&buf, "%return"); |
1739 | if (err) | |
1740 | goto out; | |
fb1587d8 MH |
1741 | } |
1742 | if (pp->file) { | |
32ae2ade FBH |
1743 | tmp = pp->file; |
1744 | len = strlen(tmp); | |
1745 | if (len > 30) { | |
1746 | tmp = strchr(pp->file + len - 30, '/'); | |
1747 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1748 | } | |
bf4d5f25 MH |
1749 | err = strbuf_addf(&buf, "@%s", tmp); |
1750 | if (!err && !pp->function && pp->line) | |
1751 | err = strbuf_addf(&buf, ":%d", pp->line); | |
4de189fe | 1752 | } |
bf4d5f25 MH |
1753 | if (!err) |
1754 | ret = strbuf_detach(&buf, NULL); | |
1755 | out: | |
1756 | strbuf_release(&buf); | |
1757 | return ret; | |
7ef17aaf MH |
1758 | } |
1759 | ||
4235b045 | 1760 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) |
7ef17aaf | 1761 | { |
c4ff4920 MH |
1762 | struct strbuf buf; |
1763 | char *tmp, *ret = NULL; | |
1764 | int i; | |
7ef17aaf | 1765 | |
c4ff4920 | 1766 | if (strbuf_init(&buf, 64)) |
4235b045 | 1767 | return NULL; |
c4ff4920 MH |
1768 | if (pev->event) |
1769 | if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, | |
1770 | pev->event) < 0) | |
1771 | goto out; | |
1772 | ||
1773 | tmp = synthesize_perf_probe_point(&pev->point); | |
1774 | if (!tmp || strbuf_addstr(&buf, tmp) < 0) | |
1775 | goto out; | |
1776 | free(tmp); | |
4de189fe | 1777 | |
4235b045 | 1778 | for (i = 0; i < pev->nargs; i++) { |
c4ff4920 MH |
1779 | tmp = synthesize_perf_probe_arg(pev->args + i); |
1780 | if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) | |
1781 | goto out; | |
1782 | free(tmp); | |
4de189fe | 1783 | } |
4de189fe | 1784 | |
c4ff4920 MH |
1785 | ret = strbuf_detach(&buf, NULL); |
1786 | out: | |
1787 | strbuf_release(&buf); | |
1788 | return ret; | |
4235b045 | 1789 | } |
4235b045 | 1790 | |
0e60836b | 1791 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
909b0360 | 1792 | struct strbuf *buf, int depth) |
4235b045 | 1793 | { |
bf4d5f25 | 1794 | int err; |
4235b045 | 1795 | if (ref->next) { |
0e60836b | 1796 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
909b0360 | 1797 | depth + 1); |
4235b045 | 1798 | if (depth < 0) |
bf4d5f25 | 1799 | return depth; |
4235b045 | 1800 | } |
bf4d5f25 MH |
1801 | err = strbuf_addf(buf, "%+ld(", ref->offset); |
1802 | return (err < 0) ? err : depth; | |
4de189fe MH |
1803 | } |
1804 | ||
0e60836b | 1805 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
909b0360 | 1806 | struct strbuf *buf) |
50656eec | 1807 | { |
0e60836b | 1808 | struct probe_trace_arg_ref *ref = arg->ref; |
bf4d5f25 | 1809 | int depth = 0, err; |
4235b045 MH |
1810 | |
1811 | /* Argument name or separator */ | |
1812 | if (arg->name) | |
bf4d5f25 | 1813 | err = strbuf_addf(buf, " %s=", arg->name); |
4235b045 | 1814 | else |
bf4d5f25 MH |
1815 | err = strbuf_addch(buf, ' '); |
1816 | if (err) | |
1817 | return err; | |
4235b045 | 1818 | |
b7dcb857 MH |
1819 | /* Special case: @XXX */ |
1820 | if (arg->value[0] == '@' && arg->ref) | |
1821 | ref = ref->next; | |
1822 | ||
4235b045 | 1823 | /* Dereferencing arguments */ |
b7dcb857 | 1824 | if (ref) { |
909b0360 | 1825 | depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); |
4235b045 MH |
1826 | if (depth < 0) |
1827 | return depth; | |
1828 | } | |
1829 | ||
1830 | /* Print argument value */ | |
b7dcb857 | 1831 | if (arg->value[0] == '@' && arg->ref) |
bf4d5f25 | 1832 | err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); |
b7dcb857 | 1833 | else |
bf4d5f25 | 1834 | err = strbuf_addstr(buf, arg->value); |
4235b045 MH |
1835 | |
1836 | /* Closing */ | |
bf4d5f25 MH |
1837 | while (!err && depth--) |
1838 | err = strbuf_addch(buf, ')'); | |
1839 | ||
4984912e | 1840 | /* Print argument type */ |
bf4d5f25 MH |
1841 | if (!err && arg->type) |
1842 | err = strbuf_addf(buf, ":%s", arg->type); | |
4235b045 | 1843 | |
bf4d5f25 | 1844 | return err; |
4235b045 MH |
1845 | } |
1846 | ||
0e60836b | 1847 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1848 | { |
0e60836b | 1849 | struct probe_trace_point *tp = &tev->point; |
909b0360 MH |
1850 | struct strbuf buf; |
1851 | char *ret = NULL; | |
bf4d5f25 | 1852 | int i, err; |
eb948e50 | 1853 | |
da15bd9d WN |
1854 | /* Uprobes must have tp->module */ |
1855 | if (tev->uprobes && !tp->module) | |
909b0360 MH |
1856 | return NULL; |
1857 | ||
bf4d5f25 MH |
1858 | if (strbuf_init(&buf, 32) < 0) |
1859 | return NULL; | |
1860 | ||
1861 | if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', | |
1862 | tev->group, tev->event) < 0) | |
1863 | goto error; | |
da15bd9d WN |
1864 | /* |
1865 | * If tp->address == 0, then this point must be a | |
1866 | * absolute address uprobe. | |
1867 | * try_to_find_absolute_address() should have made | |
1868 | * tp->symbol to "0x0". | |
1869 | */ | |
1870 | if (tev->uprobes && !tp->address) { | |
1871 | if (!tp->symbol || strcmp(tp->symbol, "0x0")) | |
1872 | goto error; | |
1873 | } | |
eb948e50 MH |
1874 | |
1875 | /* Use the tp->address for uprobes */ | |
225466f1 | 1876 | if (tev->uprobes) |
bf4d5f25 | 1877 | err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address); |
da15bd9d WN |
1878 | else if (!strncmp(tp->symbol, "0x", 2)) |
1879 | /* Absolute address. See try_to_find_absolute_address() */ | |
bf4d5f25 MH |
1880 | err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", |
1881 | tp->module ? ":" : "", tp->address); | |
225466f1 | 1882 | else |
bf4d5f25 MH |
1883 | err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", |
1884 | tp->module ? ":" : "", tp->symbol, tp->offset); | |
1885 | if (err) | |
1886 | goto error; | |
50656eec | 1887 | |
909b0360 MH |
1888 | for (i = 0; i < tev->nargs; i++) |
1889 | if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) | |
50656eec | 1890 | goto error; |
50656eec | 1891 | |
909b0360 | 1892 | ret = strbuf_detach(&buf, NULL); |
50656eec | 1893 | error: |
909b0360 MH |
1894 | strbuf_release(&buf); |
1895 | return ret; | |
4235b045 | 1896 | } |
50656eec | 1897 | |
5a6f6314 MH |
1898 | static int find_perf_probe_point_from_map(struct probe_trace_point *tp, |
1899 | struct perf_probe_point *pp, | |
1900 | bool is_kprobe) | |
1901 | { | |
1902 | struct symbol *sym = NULL; | |
1903 | struct map *map; | |
e486367f | 1904 | u64 addr = tp->address; |
5a6f6314 MH |
1905 | int ret = -ENOENT; |
1906 | ||
1907 | if (!is_kprobe) { | |
1908 | map = dso__new_map(tp->module); | |
1909 | if (!map) | |
1910 | goto out; | |
5a6f6314 MH |
1911 | sym = map__find_symbol(map, addr, NULL); |
1912 | } else { | |
9b239a12 | 1913 | if (tp->symbol && !addr) { |
0a62f686 MH |
1914 | if (kernel_get_symbol_address_by_name(tp->symbol, |
1915 | &addr, true, false) < 0) | |
9b239a12 MH |
1916 | goto out; |
1917 | } | |
5a6f6314 MH |
1918 | if (addr) { |
1919 | addr += tp->offset; | |
1920 | sym = __find_kernel_function(addr, &map); | |
1921 | } | |
1922 | } | |
98d3b258 | 1923 | |
5a6f6314 MH |
1924 | if (!sym) |
1925 | goto out; | |
1926 | ||
1927 | pp->retprobe = tp->retprobe; | |
1928 | pp->offset = addr - map->unmap_ip(map, sym->start); | |
1929 | pp->function = strdup(sym->name); | |
1930 | ret = pp->function ? 0 : -ENOMEM; | |
1931 | ||
1932 | out: | |
1933 | if (map && !is_kprobe) { | |
84c2cafa | 1934 | map__put(map); |
5a6f6314 MH |
1935 | } |
1936 | ||
1937 | return ret; | |
1938 | } | |
1939 | ||
1940 | static int convert_to_perf_probe_point(struct probe_trace_point *tp, | |
da15bd9d WN |
1941 | struct perf_probe_point *pp, |
1942 | bool is_kprobe) | |
5a6f6314 MH |
1943 | { |
1944 | char buf[128]; | |
1945 | int ret; | |
1946 | ||
1947 | ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); | |
1948 | if (!ret) | |
1949 | return 0; | |
1950 | ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); | |
1951 | if (!ret) | |
1952 | return 0; | |
1953 | ||
1954 | pr_debug("Failed to find probe point from both of dwarf and map.\n"); | |
1955 | ||
1956 | if (tp->symbol) { | |
1957 | pp->function = strdup(tp->symbol); | |
1958 | pp->offset = tp->offset; | |
614e2fdb | 1959 | } else { |
5a6f6314 MH |
1960 | ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); |
1961 | if (ret < 0) | |
1962 | return ret; | |
1963 | pp->function = strdup(buf); | |
1964 | pp->offset = 0; | |
1965 | } | |
1966 | if (pp->function == NULL) | |
1967 | return -ENOMEM; | |
1968 | ||
1969 | pp->retprobe = tp->retprobe; | |
1970 | ||
1971 | return 0; | |
1972 | } | |
1973 | ||
0e60836b | 1974 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
225466f1 | 1975 | struct perf_probe_event *pev, bool is_kprobe) |
4235b045 | 1976 | { |
909b0360 | 1977 | struct strbuf buf = STRBUF_INIT; |
146a1439 | 1978 | int i, ret; |
4235b045 | 1979 | |
4b4da7f7 | 1980 | /* Convert event/group name */ |
02b95dad MH |
1981 | pev->event = strdup(tev->event); |
1982 | pev->group = strdup(tev->group); | |
1983 | if (pev->event == NULL || pev->group == NULL) | |
1984 | return -ENOMEM; | |
fb1587d8 | 1985 | |
4b4da7f7 | 1986 | /* Convert trace_point to probe_point */ |
5a6f6314 | 1987 | ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); |
146a1439 MH |
1988 | if (ret < 0) |
1989 | return ret; | |
4b4da7f7 | 1990 | |
4235b045 MH |
1991 | /* Convert trace_arg to probe_arg */ |
1992 | pev->nargs = tev->nargs; | |
e334016f MH |
1993 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1994 | if (pev->args == NULL) | |
1995 | return -ENOMEM; | |
02b95dad | 1996 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1997 | if (tev->args[i].name) |
02b95dad | 1998 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1999 | else { |
bf4d5f25 MH |
2000 | if ((ret = strbuf_init(&buf, 32)) < 0) |
2001 | goto error; | |
909b0360 MH |
2002 | ret = synthesize_probe_trace_arg(&tev->args[i], &buf); |
2003 | pev->args[i].name = strbuf_detach(&buf, NULL); | |
4235b045 | 2004 | } |
02b95dad MH |
2005 | if (pev->args[i].name == NULL && ret >= 0) |
2006 | ret = -ENOMEM; | |
2007 | } | |
bf4d5f25 | 2008 | error: |
146a1439 MH |
2009 | if (ret < 0) |
2010 | clear_perf_probe_event(pev); | |
2011 | ||
2012 | return ret; | |
4235b045 MH |
2013 | } |
2014 | ||
2015 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
2016 | { | |
7df2f329 | 2017 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
2018 | int i; |
2019 | ||
f5385650 ACM |
2020 | free(pev->event); |
2021 | free(pev->group); | |
7afb3fab | 2022 | free(pev->target); |
9b118aca | 2023 | clear_perf_probe_point(&pev->point); |
f5385650 | 2024 | |
7df2f329 | 2025 | for (i = 0; i < pev->nargs; i++) { |
f5385650 ACM |
2026 | free(pev->args[i].name); |
2027 | free(pev->args[i].var); | |
2028 | free(pev->args[i].type); | |
7df2f329 MH |
2029 | field = pev->args[i].field; |
2030 | while (field) { | |
2031 | next = field->next; | |
74cf249d | 2032 | zfree(&field->name); |
7df2f329 MH |
2033 | free(field); |
2034 | field = next; | |
2035 | } | |
2036 | } | |
f5385650 | 2037 | free(pev->args); |
4235b045 MH |
2038 | memset(pev, 0, sizeof(*pev)); |
2039 | } | |
2040 | ||
0542bb9c MH |
2041 | #define strdup_or_goto(str, label) \ |
2042 | ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) | |
2043 | ||
2044 | static int perf_probe_point__copy(struct perf_probe_point *dst, | |
2045 | struct perf_probe_point *src) | |
2046 | { | |
2047 | dst->file = strdup_or_goto(src->file, out_err); | |
2048 | dst->function = strdup_or_goto(src->function, out_err); | |
2049 | dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); | |
2050 | dst->line = src->line; | |
2051 | dst->retprobe = src->retprobe; | |
2052 | dst->offset = src->offset; | |
2053 | return 0; | |
2054 | ||
2055 | out_err: | |
2056 | clear_perf_probe_point(dst); | |
2057 | return -ENOMEM; | |
2058 | } | |
2059 | ||
2060 | static int perf_probe_arg__copy(struct perf_probe_arg *dst, | |
2061 | struct perf_probe_arg *src) | |
2062 | { | |
2063 | struct perf_probe_arg_field *field, **ppfield; | |
2064 | ||
2065 | dst->name = strdup_or_goto(src->name, out_err); | |
2066 | dst->var = strdup_or_goto(src->var, out_err); | |
2067 | dst->type = strdup_or_goto(src->type, out_err); | |
2068 | ||
2069 | field = src->field; | |
2070 | ppfield = &(dst->field); | |
2071 | while (field) { | |
2072 | *ppfield = zalloc(sizeof(*field)); | |
2073 | if (!*ppfield) | |
2074 | goto out_err; | |
2075 | (*ppfield)->name = strdup_or_goto(field->name, out_err); | |
2076 | (*ppfield)->index = field->index; | |
2077 | (*ppfield)->ref = field->ref; | |
2078 | field = field->next; | |
2079 | ppfield = &((*ppfield)->next); | |
2080 | } | |
2081 | return 0; | |
2082 | out_err: | |
2083 | return -ENOMEM; | |
2084 | } | |
2085 | ||
2086 | int perf_probe_event__copy(struct perf_probe_event *dst, | |
2087 | struct perf_probe_event *src) | |
2088 | { | |
2089 | int i; | |
2090 | ||
2091 | dst->event = strdup_or_goto(src->event, out_err); | |
2092 | dst->group = strdup_or_goto(src->group, out_err); | |
2093 | dst->target = strdup_or_goto(src->target, out_err); | |
2094 | dst->uprobes = src->uprobes; | |
2095 | ||
2096 | if (perf_probe_point__copy(&dst->point, &src->point) < 0) | |
2097 | goto out_err; | |
2098 | ||
2099 | dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); | |
2100 | if (!dst->args) | |
2101 | goto out_err; | |
2102 | dst->nargs = src->nargs; | |
2103 | ||
2104 | for (i = 0; i < src->nargs; i++) | |
2105 | if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) | |
2106 | goto out_err; | |
2107 | return 0; | |
2108 | ||
2109 | out_err: | |
2110 | clear_perf_probe_event(dst); | |
2111 | return -ENOMEM; | |
2112 | } | |
2113 | ||
92f6c72e | 2114 | void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 2115 | { |
0e60836b | 2116 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
2117 | int i; |
2118 | ||
f5385650 ACM |
2119 | free(tev->event); |
2120 | free(tev->group); | |
2121 | free(tev->point.symbol); | |
4c859351 | 2122 | free(tev->point.realname); |
f5385650 | 2123 | free(tev->point.module); |
4235b045 | 2124 | for (i = 0; i < tev->nargs; i++) { |
f5385650 ACM |
2125 | free(tev->args[i].name); |
2126 | free(tev->args[i].value); | |
2127 | free(tev->args[i].type); | |
4235b045 MH |
2128 | ref = tev->args[i].ref; |
2129 | while (ref) { | |
2130 | next = ref->next; | |
2131 | free(ref); | |
2132 | ref = next; | |
2133 | } | |
2134 | } | |
f5385650 | 2135 | free(tev->args); |
4235b045 | 2136 | memset(tev, 0, sizeof(*tev)); |
50656eec MH |
2137 | } |
2138 | ||
9aaf5a5f MH |
2139 | struct kprobe_blacklist_node { |
2140 | struct list_head list; | |
2141 | unsigned long start; | |
2142 | unsigned long end; | |
2143 | char *symbol; | |
2144 | }; | |
2145 | ||
2146 | static void kprobe_blacklist__delete(struct list_head *blacklist) | |
2147 | { | |
2148 | struct kprobe_blacklist_node *node; | |
2149 | ||
2150 | while (!list_empty(blacklist)) { | |
2151 | node = list_first_entry(blacklist, | |
2152 | struct kprobe_blacklist_node, list); | |
2153 | list_del(&node->list); | |
2154 | free(node->symbol); | |
2155 | free(node); | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | static int kprobe_blacklist__load(struct list_head *blacklist) | |
2160 | { | |
2161 | struct kprobe_blacklist_node *node; | |
4605eab3 | 2162 | const char *__debugfs = debugfs__mountpoint(); |
9aaf5a5f MH |
2163 | char buf[PATH_MAX], *p; |
2164 | FILE *fp; | |
2165 | int ret; | |
2166 | ||
2167 | if (__debugfs == NULL) | |
2168 | return -ENOTSUP; | |
2169 | ||
2170 | ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); | |
2171 | if (ret < 0) | |
2172 | return ret; | |
2173 | ||
2174 | fp = fopen(buf, "r"); | |
2175 | if (!fp) | |
2176 | return -errno; | |
2177 | ||
2178 | ret = 0; | |
2179 | while (fgets(buf, PATH_MAX, fp)) { | |
2180 | node = zalloc(sizeof(*node)); | |
2181 | if (!node) { | |
2182 | ret = -ENOMEM; | |
2183 | break; | |
2184 | } | |
2185 | INIT_LIST_HEAD(&node->list); | |
2186 | list_add_tail(&node->list, blacklist); | |
2187 | if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { | |
2188 | ret = -EINVAL; | |
2189 | break; | |
2190 | } | |
2191 | p = strchr(buf, '\t'); | |
2192 | if (p) { | |
2193 | p++; | |
2194 | if (p[strlen(p) - 1] == '\n') | |
2195 | p[strlen(p) - 1] = '\0'; | |
2196 | } else | |
2197 | p = (char *)"unknown"; | |
2198 | node->symbol = strdup(p); | |
2199 | if (!node->symbol) { | |
2200 | ret = -ENOMEM; | |
2201 | break; | |
2202 | } | |
2203 | pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", | |
2204 | node->start, node->end, node->symbol); | |
2205 | ret++; | |
2206 | } | |
2207 | if (ret < 0) | |
2208 | kprobe_blacklist__delete(blacklist); | |
2209 | fclose(fp); | |
2210 | ||
2211 | return ret; | |
2212 | } | |
2213 | ||
2214 | static struct kprobe_blacklist_node * | |
2215 | kprobe_blacklist__find_by_address(struct list_head *blacklist, | |
2216 | unsigned long address) | |
2217 | { | |
2218 | struct kprobe_blacklist_node *node; | |
2219 | ||
2220 | list_for_each_entry(node, blacklist, list) { | |
2221 | if (node->start <= address && address <= node->end) | |
2222 | return node; | |
2223 | } | |
2224 | ||
2225 | return NULL; | |
2226 | } | |
2227 | ||
b031220d MH |
2228 | static LIST_HEAD(kprobe_blacklist); |
2229 | ||
2230 | static void kprobe_blacklist__init(void) | |
2231 | { | |
2232 | if (!list_empty(&kprobe_blacklist)) | |
2233 | return; | |
2234 | ||
2235 | if (kprobe_blacklist__load(&kprobe_blacklist) < 0) | |
2236 | pr_debug("No kprobe blacklist support, ignored\n"); | |
2237 | } | |
2238 | ||
2239 | static void kprobe_blacklist__release(void) | |
2240 | { | |
2241 | kprobe_blacklist__delete(&kprobe_blacklist); | |
2242 | } | |
2243 | ||
2244 | static bool kprobe_blacklist__listed(unsigned long address) | |
2245 | { | |
2246 | return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); | |
2247 | } | |
2248 | ||
d350bd57 MH |
2249 | static int perf_probe_event__sprintf(const char *group, const char *event, |
2250 | struct perf_probe_event *pev, | |
ba7ecb02 MH |
2251 | const char *module, |
2252 | struct strbuf *result) | |
278498d4 | 2253 | { |
bf4d5f25 | 2254 | int i, ret; |
909b0360 | 2255 | char *buf; |
278498d4 | 2256 | |
909b0360 MH |
2257 | if (asprintf(&buf, "%s:%s", group, event) < 0) |
2258 | return -errno; | |
bf4d5f25 | 2259 | ret = strbuf_addf(result, " %-20s (on ", buf); |
909b0360 | 2260 | free(buf); |
bf4d5f25 MH |
2261 | if (ret) |
2262 | return ret; | |
4235b045 | 2263 | |
909b0360 MH |
2264 | /* Synthesize only event probe point */ |
2265 | buf = synthesize_perf_probe_point(&pev->point); | |
2266 | if (!buf) | |
2267 | return -ENOMEM; | |
bf4d5f25 | 2268 | ret = strbuf_addstr(result, buf); |
909b0360 | 2269 | free(buf); |
146a1439 | 2270 | |
bf4d5f25 MH |
2271 | if (!ret && module) |
2272 | ret = strbuf_addf(result, " in %s", module); | |
278498d4 | 2273 | |
bf4d5f25 MH |
2274 | if (!ret && pev->nargs > 0) { |
2275 | ret = strbuf_add(result, " with", 5); | |
2276 | for (i = 0; !ret && i < pev->nargs; i++) { | |
909b0360 MH |
2277 | buf = synthesize_perf_probe_arg(&pev->args[i]); |
2278 | if (!buf) | |
2279 | return -ENOMEM; | |
bf4d5f25 | 2280 | ret = strbuf_addf(result, " %s", buf); |
909b0360 | 2281 | free(buf); |
7df2f329 | 2282 | } |
278498d4 | 2283 | } |
bf4d5f25 MH |
2284 | if (!ret) |
2285 | ret = strbuf_addch(result, ')'); | |
909b0360 | 2286 | |
bf4d5f25 | 2287 | return ret; |
278498d4 MH |
2288 | } |
2289 | ||
ba7ecb02 | 2290 | /* Show an event */ |
b02137cc NK |
2291 | int show_perf_probe_event(const char *group, const char *event, |
2292 | struct perf_probe_event *pev, | |
2293 | const char *module, bool use_stdout) | |
ba7ecb02 MH |
2294 | { |
2295 | struct strbuf buf = STRBUF_INIT; | |
2296 | int ret; | |
2297 | ||
d350bd57 | 2298 | ret = perf_probe_event__sprintf(group, event, pev, module, &buf); |
ba7ecb02 MH |
2299 | if (ret >= 0) { |
2300 | if (use_stdout) | |
2301 | printf("%s\n", buf.buf); | |
2302 | else | |
2303 | pr_info("%s\n", buf.buf); | |
2304 | } | |
2305 | strbuf_release(&buf); | |
2306 | ||
2307 | return ret; | |
2308 | } | |
2309 | ||
b6a89643 MH |
2310 | static bool filter_probe_trace_event(struct probe_trace_event *tev, |
2311 | struct strfilter *filter) | |
2312 | { | |
2313 | char tmp[128]; | |
2314 | ||
2315 | /* At first, check the event name itself */ | |
2316 | if (strfilter__compare(filter, tev->event)) | |
2317 | return true; | |
2318 | ||
2319 | /* Next, check the combination of name and group */ | |
2320 | if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) | |
2321 | return false; | |
2322 | return strfilter__compare(filter, tmp); | |
2323 | } | |
2324 | ||
2325 | static int __show_perf_probe_events(int fd, bool is_kprobe, | |
2326 | struct strfilter *filter) | |
4de189fe | 2327 | { |
225466f1 | 2328 | int ret = 0; |
0e60836b | 2329 | struct probe_trace_event tev; |
4235b045 | 2330 | struct perf_probe_event pev; |
4de189fe MH |
2331 | struct strlist *rawlist; |
2332 | struct str_node *ent; | |
2333 | ||
4235b045 MH |
2334 | memset(&tev, 0, sizeof(tev)); |
2335 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 2336 | |
92f6c72e | 2337 | rawlist = probe_file__get_rawlist(fd); |
146a1439 | 2338 | if (!rawlist) |
6eb08660 | 2339 | return -ENOMEM; |
4de189fe | 2340 | |
602a1f4d | 2341 | strlist__for_each_entry(ent, rawlist) { |
0e60836b | 2342 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 | 2343 | if (ret >= 0) { |
b6a89643 MH |
2344 | if (!filter_probe_trace_event(&tev, filter)) |
2345 | goto next; | |
225466f1 SD |
2346 | ret = convert_to_perf_probe_event(&tev, &pev, |
2347 | is_kprobe); | |
ba7ecb02 MH |
2348 | if (ret < 0) |
2349 | goto next; | |
d350bd57 MH |
2350 | ret = show_perf_probe_event(pev.group, pev.event, |
2351 | &pev, tev.point.module, | |
ba7ecb02 | 2352 | true); |
146a1439 | 2353 | } |
b6a89643 | 2354 | next: |
4235b045 | 2355 | clear_perf_probe_event(&pev); |
0e60836b | 2356 | clear_probe_trace_event(&tev); |
146a1439 MH |
2357 | if (ret < 0) |
2358 | break; | |
4de189fe | 2359 | } |
4de189fe | 2360 | strlist__delete(rawlist); |
7737af01 MH |
2361 | /* Cleanup cached debuginfo if needed */ |
2362 | debuginfo_cache__exit(); | |
146a1439 MH |
2363 | |
2364 | return ret; | |
4de189fe MH |
2365 | } |
2366 | ||
225466f1 | 2367 | /* List up current perf-probe events */ |
b6a89643 | 2368 | int show_perf_probe_events(struct strfilter *filter) |
225466f1 | 2369 | { |
5e45187c | 2370 | int kp_fd, up_fd, ret; |
225466f1 SD |
2371 | |
2372 | setup_pager(); | |
225466f1 | 2373 | |
1f3736c9 MH |
2374 | if (probe_conf.cache) |
2375 | return probe_cache__show_all_caches(filter); | |
2376 | ||
9bae1e8c | 2377 | ret = init_probe_symbol_maps(false); |
225466f1 SD |
2378 | if (ret < 0) |
2379 | return ret; | |
2380 | ||
92f6c72e MH |
2381 | ret = probe_file__open_both(&kp_fd, &up_fd, 0); |
2382 | if (ret < 0) | |
2383 | return ret; | |
225466f1 | 2384 | |
92f6c72e MH |
2385 | if (kp_fd >= 0) |
2386 | ret = __show_perf_probe_events(kp_fd, true, filter); | |
2387 | if (up_fd >= 0 && ret >= 0) | |
b6a89643 | 2388 | ret = __show_perf_probe_events(up_fd, false, filter); |
92f6c72e MH |
2389 | if (kp_fd > 0) |
2390 | close(kp_fd); | |
2391 | if (up_fd > 0) | |
5e45187c | 2392 | close(up_fd); |
9bae1e8c | 2393 | exit_probe_symbol_maps(); |
225466f1 | 2394 | |
146a1439 | 2395 | return ret; |
50656eec MH |
2396 | } |
2397 | ||
146a1439 MH |
2398 | static int get_new_event_name(char *buf, size_t len, const char *base, |
2399 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
2400 | { |
2401 | int i, ret; | |
663b1151 | 2402 | char *p, *nbase; |
17f88fcd | 2403 | |
3099c026 NR |
2404 | if (*base == '.') |
2405 | base++; | |
663b1151 MH |
2406 | nbase = strdup(base); |
2407 | if (!nbase) | |
2408 | return -ENOMEM; | |
2409 | ||
2410 | /* Cut off the dot suffixes (e.g. .const, .isra)*/ | |
2411 | p = strchr(nbase, '.'); | |
2412 | if (p && p != nbase) | |
2413 | *p = '\0'; | |
3099c026 | 2414 | |
663b1151 MH |
2415 | /* Try no suffix number */ |
2416 | ret = e_snprintf(buf, len, "%s", nbase); | |
146a1439 | 2417 | if (ret < 0) { |
5f03cba4 | 2418 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2419 | goto out; |
146a1439 | 2420 | } |
17f88fcd | 2421 | if (!strlist__has_entry(namelist, buf)) |
663b1151 | 2422 | goto out; |
17f88fcd | 2423 | |
d761b08b | 2424 | if (!allow_suffix) { |
03e01f56 WN |
2425 | pr_warning("Error: event \"%s\" already exists.\n" |
2426 | " Hint: Remove existing event by 'perf probe -d'\n" | |
2427 | " or force duplicates by 'perf probe -f'\n" | |
2428 | " or set 'force=yes' in BPF source.\n", | |
2429 | buf); | |
663b1151 MH |
2430 | ret = -EEXIST; |
2431 | goto out; | |
d761b08b MH |
2432 | } |
2433 | ||
17f88fcd MH |
2434 | /* Try to add suffix */ |
2435 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
663b1151 | 2436 | ret = e_snprintf(buf, len, "%s_%d", nbase, i); |
146a1439 | 2437 | if (ret < 0) { |
5f03cba4 | 2438 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2439 | goto out; |
146a1439 | 2440 | } |
b498ce1f MH |
2441 | if (!strlist__has_entry(namelist, buf)) |
2442 | break; | |
2443 | } | |
146a1439 MH |
2444 | if (i == MAX_EVENT_INDEX) { |
2445 | pr_warning("Too many events are on the same function.\n"); | |
2446 | ret = -ERANGE; | |
2447 | } | |
2448 | ||
663b1151 MH |
2449 | out: |
2450 | free(nbase); | |
146a1439 | 2451 | return ret; |
b498ce1f MH |
2452 | } |
2453 | ||
79702f61 MH |
2454 | /* Warn if the current kernel's uprobe implementation is old */ |
2455 | static void warn_uprobe_event_compat(struct probe_trace_event *tev) | |
2456 | { | |
2457 | int i; | |
2458 | char *buf = synthesize_probe_trace_command(tev); | |
2459 | ||
2460 | /* Old uprobe event doesn't support memory dereference */ | |
2461 | if (!tev->uprobes || tev->nargs == 0 || !buf) | |
2462 | goto out; | |
2463 | ||
2464 | for (i = 0; i < tev->nargs; i++) | |
2465 | if (strglobmatch(tev->args[i].value, "[$@+-]*")) { | |
2466 | pr_warning("Please upgrade your kernel to at least " | |
2467 | "3.14 to have access to feature %s\n", | |
2468 | tev->args[i].value); | |
2469 | break; | |
2470 | } | |
2471 | out: | |
2472 | free(buf); | |
2473 | } | |
2474 | ||
a3c9de62 MH |
2475 | /* Set new name from original perf_probe_event and namelist */ |
2476 | static int probe_trace_event__set_name(struct probe_trace_event *tev, | |
2477 | struct perf_probe_event *pev, | |
2478 | struct strlist *namelist, | |
2479 | bool allow_suffix) | |
2480 | { | |
2481 | const char *event, *group; | |
2482 | char buf[64]; | |
2483 | int ret; | |
2484 | ||
bc062230 | 2485 | /* If probe_event or trace_event already have the name, reuse it */ |
a3c9de62 MH |
2486 | if (pev->event) |
2487 | event = pev->event; | |
bc062230 MH |
2488 | else if (tev->event) |
2489 | event = tev->event; | |
2490 | else { | |
2491 | /* Or generate new one from probe point */ | |
da15bd9d WN |
2492 | if (pev->point.function && |
2493 | (strncmp(pev->point.function, "0x", 2) != 0) && | |
2494 | !strisglob(pev->point.function)) | |
a3c9de62 MH |
2495 | event = pev->point.function; |
2496 | else | |
2497 | event = tev->point.realname; | |
bc062230 | 2498 | } |
a3c9de62 MH |
2499 | if (pev->group) |
2500 | group = pev->group; | |
bc062230 MH |
2501 | else if (tev->group) |
2502 | group = tev->group; | |
a3c9de62 MH |
2503 | else |
2504 | group = PERFPROBE_GROUP; | |
2505 | ||
2506 | /* Get an unused new event name */ | |
2507 | ret = get_new_event_name(buf, 64, event, | |
2508 | namelist, allow_suffix); | |
2509 | if (ret < 0) | |
2510 | return ret; | |
2511 | ||
2512 | event = buf; | |
2513 | ||
2514 | tev->event = strdup(event); | |
2515 | tev->group = strdup(group); | |
2516 | if (tev->event == NULL || tev->group == NULL) | |
2517 | return -ENOMEM; | |
2518 | ||
2519 | /* Add added event name to namelist */ | |
2520 | strlist__add(namelist, event); | |
2521 | return 0; | |
2522 | } | |
2523 | ||
0e60836b SD |
2524 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
2525 | struct probe_trace_event *tevs, | |
146a1439 | 2526 | int ntevs, bool allow_suffix) |
50656eec | 2527 | { |
146a1439 | 2528 | int i, fd, ret; |
0e60836b | 2529 | struct probe_trace_event *tev = NULL; |
2fd457a3 | 2530 | struct probe_cache *cache = NULL; |
b498ce1f | 2531 | struct strlist *namelist; |
50656eec | 2532 | |
92f6c72e MH |
2533 | fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0)); |
2534 | if (fd < 0) | |
146a1439 | 2535 | return fd; |
5e45187c | 2536 | |
b498ce1f | 2537 | /* Get current event names */ |
92f6c72e | 2538 | namelist = probe_file__get_namelist(fd); |
146a1439 MH |
2539 | if (!namelist) { |
2540 | pr_debug("Failed to get current event list.\n"); | |
ae2cb1ac MH |
2541 | ret = -ENOMEM; |
2542 | goto close_out; | |
146a1439 | 2543 | } |
4235b045 | 2544 | |
146a1439 | 2545 | ret = 0; |
02b95dad | 2546 | for (i = 0; i < ntevs; i++) { |
4235b045 | 2547 | tev = &tevs[i]; |
b031220d | 2548 | /* Skip if the symbol is out of .text or blacklisted */ |
bc062230 | 2549 | if (!tev->point.symbol && !pev->uprobes) |
5a51fcd1 | 2550 | continue; |
9aaf5a5f | 2551 | |
a3c9de62 MH |
2552 | /* Set new name for tev (and update namelist) */ |
2553 | ret = probe_trace_event__set_name(tev, pev, namelist, | |
2554 | allow_suffix); | |
146a1439 MH |
2555 | if (ret < 0) |
2556 | break; | |
4235b045 | 2557 | |
92f6c72e | 2558 | ret = probe_file__add_event(fd, tev); |
146a1439 MH |
2559 | if (ret < 0) |
2560 | break; | |
4235b045 | 2561 | |
4235b045 MH |
2562 | /* |
2563 | * Probes after the first probe which comes from same | |
2564 | * user input are always allowed to add suffix, because | |
2565 | * there might be several addresses corresponding to | |
2566 | * one code line. | |
2567 | */ | |
2568 | allow_suffix = true; | |
50656eec | 2569 | } |
79702f61 MH |
2570 | if (ret == -EINVAL && pev->uprobes) |
2571 | warn_uprobe_event_compat(tev); | |
2fd457a3 MH |
2572 | if (ret == 0 && probe_conf.cache) { |
2573 | cache = probe_cache__new(pev->target); | |
2574 | if (!cache || | |
2575 | probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || | |
2576 | probe_cache__commit(cache) < 0) | |
2577 | pr_warning("Failed to add event to probe cache\n"); | |
2578 | probe_cache__delete(cache); | |
2579 | } | |
146a1439 | 2580 | |
e1d2017b | 2581 | strlist__delete(namelist); |
ae2cb1ac | 2582 | close_out: |
50656eec | 2583 | close(fd); |
146a1439 | 2584 | return ret; |
50656eec | 2585 | } |
fa28244d | 2586 | |
6bb536cc WN |
2587 | static int find_probe_functions(struct map *map, char *name, |
2588 | struct symbol **syms) | |
eb948e50 | 2589 | { |
564c62a4 | 2590 | int found = 0; |
0a3873a8 | 2591 | struct symbol *sym; |
4c859351 | 2592 | struct rb_node *tmp; |
564c62a4 | 2593 | |
75e4a2a6 WN |
2594 | if (map__load(map, NULL) < 0) |
2595 | return 0; | |
2596 | ||
4c859351 | 2597 | map__for_each_symbol(map, sym, tmp) { |
6bb536cc | 2598 | if (strglobmatch(sym->name, name)) { |
4c859351 | 2599 | found++; |
6bb536cc WN |
2600 | if (syms && found < probe_conf.max_probes) |
2601 | syms[found - 1] = sym; | |
2602 | } | |
eb948e50 | 2603 | } |
564c62a4 NK |
2604 | |
2605 | return found; | |
eb948e50 MH |
2606 | } |
2607 | ||
7b6ff0bd NR |
2608 | void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, |
2609 | struct probe_trace_event *tev __maybe_unused, | |
0b3c2264 NR |
2610 | struct map *map __maybe_unused, |
2611 | struct symbol *sym __maybe_unused) { } | |
7b6ff0bd | 2612 | |
eb948e50 MH |
2613 | /* |
2614 | * Find probe function addresses from map. | |
2615 | * Return an error or the number of found probe_trace_event | |
2616 | */ | |
2617 | static int find_probe_trace_events_from_map(struct perf_probe_event *pev, | |
ddb2f58f | 2618 | struct probe_trace_event **tevs) |
e0faa8d3 | 2619 | { |
eb948e50 | 2620 | struct map *map = NULL; |
eb948e50 | 2621 | struct ref_reloc_sym *reloc_sym = NULL; |
e0faa8d3 | 2622 | struct symbol *sym; |
6bb536cc | 2623 | struct symbol **syms = NULL; |
0e60836b | 2624 | struct probe_trace_event *tev; |
eb948e50 MH |
2625 | struct perf_probe_point *pp = &pev->point; |
2626 | struct probe_trace_point *tp; | |
564c62a4 | 2627 | int num_matched_functions; |
b031220d | 2628 | int ret, i, j, skipped = 0; |
c61fb959 | 2629 | char *mod_name; |
4235b045 | 2630 | |
44225521 | 2631 | map = get_target_map(pev->target, pev->uprobes); |
eb948e50 MH |
2632 | if (!map) { |
2633 | ret = -EINVAL; | |
2634 | goto out; | |
fb7345bb MH |
2635 | } |
2636 | ||
6bb536cc WN |
2637 | syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); |
2638 | if (!syms) { | |
2639 | ret = -ENOMEM; | |
2640 | goto out; | |
2641 | } | |
2642 | ||
eb948e50 MH |
2643 | /* |
2644 | * Load matched symbols: Since the different local symbols may have | |
2645 | * same name but different addresses, this lists all the symbols. | |
2646 | */ | |
6bb536cc | 2647 | num_matched_functions = find_probe_functions(map, pp->function, syms); |
564c62a4 | 2648 | if (num_matched_functions == 0) { |
eb948e50 | 2649 | pr_err("Failed to find symbol %s in %s\n", pp->function, |
44225521 | 2650 | pev->target ? : "kernel"); |
eb948e50 MH |
2651 | ret = -ENOENT; |
2652 | goto out; | |
ddb2f58f | 2653 | } else if (num_matched_functions > probe_conf.max_probes) { |
eb948e50 | 2654 | pr_err("Too many functions matched in %s\n", |
44225521 | 2655 | pev->target ? : "kernel"); |
eb948e50 MH |
2656 | ret = -E2BIG; |
2657 | goto out; | |
fb7345bb MH |
2658 | } |
2659 | ||
1a8ac29c MH |
2660 | /* Note that the symbols in the kmodule are not relocated */ |
2661 | if (!pev->uprobes && !pp->retprobe && !pev->target) { | |
0560a0c4 | 2662 | reloc_sym = kernel_get_ref_reloc_sym(); |
eb948e50 MH |
2663 | if (!reloc_sym) { |
2664 | pr_warning("Relocated base symbol is not found!\n"); | |
2665 | ret = -EINVAL; | |
2666 | goto out; | |
2667 | } | |
2668 | } | |
4235b045 | 2669 | |
eb948e50 MH |
2670 | /* Setup result trace-probe-events */ |
2671 | *tevs = zalloc(sizeof(*tev) * num_matched_functions); | |
2672 | if (!*tevs) { | |
02b95dad | 2673 | ret = -ENOMEM; |
eb948e50 | 2674 | goto out; |
02b95dad | 2675 | } |
ce27a443 | 2676 | |
eb948e50 | 2677 | ret = 0; |
564c62a4 | 2678 | |
6bb536cc WN |
2679 | for (j = 0; j < num_matched_functions; j++) { |
2680 | sym = syms[j]; | |
2681 | ||
eb948e50 MH |
2682 | tev = (*tevs) + ret; |
2683 | tp = &tev->point; | |
2684 | if (ret == num_matched_functions) { | |
2685 | pr_warning("Too many symbols are listed. Skip it.\n"); | |
2686 | break; | |
ce27a443 | 2687 | } |
eb948e50 | 2688 | ret++; |
ce27a443 | 2689 | |
eb948e50 MH |
2690 | if (pp->offset > sym->end - sym->start) { |
2691 | pr_warning("Offset %ld is bigger than the size of %s\n", | |
2692 | pp->offset, sym->name); | |
2693 | ret = -ENOENT; | |
2694 | goto err_out; | |
2695 | } | |
2696 | /* Add one probe point */ | |
2697 | tp->address = map->unmap_ip(map, sym->start) + pp->offset; | |
1a8ac29c MH |
2698 | |
2699 | /* Check the kprobe (not in module) is within .text */ | |
2700 | if (!pev->uprobes && !pev->target && | |
b031220d MH |
2701 | kprobe_warn_out_range(sym->name, tp->address)) { |
2702 | tp->symbol = NULL; /* Skip it */ | |
2703 | skipped++; | |
2704 | } else if (reloc_sym) { | |
eb948e50 MH |
2705 | tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); |
2706 | tp->offset = tp->address - reloc_sym->addr; | |
2707 | } else { | |
2708 | tp->symbol = strdup_or_goto(sym->name, nomem_out); | |
2709 | tp->offset = pp->offset; | |
2710 | } | |
6bb536cc WN |
2711 | tp->realname = strdup_or_goto(sym->name, nomem_out); |
2712 | ||
eb948e50 | 2713 | tp->retprobe = pp->retprobe; |
c61fb959 RB |
2714 | if (pev->target) { |
2715 | if (pev->uprobes) { | |
2716 | tev->point.module = strdup_or_goto(pev->target, | |
2717 | nomem_out); | |
2718 | } else { | |
2719 | mod_name = find_module_name(pev->target); | |
2720 | tev->point.module = | |
2721 | strdup(mod_name ? mod_name : pev->target); | |
2722 | free(mod_name); | |
2723 | if (!tev->point.module) | |
2724 | goto nomem_out; | |
2725 | } | |
2726 | } | |
eb948e50 MH |
2727 | tev->uprobes = pev->uprobes; |
2728 | tev->nargs = pev->nargs; | |
2729 | if (tev->nargs) { | |
2730 | tev->args = zalloc(sizeof(struct probe_trace_arg) * | |
2731 | tev->nargs); | |
2732 | if (tev->args == NULL) | |
2733 | goto nomem_out; | |
e334016f | 2734 | } |
48481938 | 2735 | for (i = 0; i < tev->nargs; i++) { |
eb948e50 MH |
2736 | if (pev->args[i].name) |
2737 | tev->args[i].name = | |
2738 | strdup_or_goto(pev->args[i].name, | |
2739 | nomem_out); | |
2740 | ||
2741 | tev->args[i].value = strdup_or_goto(pev->args[i].var, | |
2742 | nomem_out); | |
2743 | if (pev->args[i].type) | |
2744 | tev->args[i].type = | |
2745 | strdup_or_goto(pev->args[i].type, | |
2746 | nomem_out); | |
48481938 | 2747 | } |
0b3c2264 | 2748 | arch__fix_tev_from_maps(pev, tev, map, sym); |
4235b045 | 2749 | } |
b031220d MH |
2750 | if (ret == skipped) { |
2751 | ret = -ENOENT; | |
2752 | goto err_out; | |
2753 | } | |
4235b045 | 2754 | |
eb948e50 | 2755 | out: |
9b118aca | 2756 | put_target_map(map, pev->uprobes); |
6bb536cc | 2757 | free(syms); |
eb948e50 | 2758 | return ret; |
225466f1 | 2759 | |
eb948e50 MH |
2760 | nomem_out: |
2761 | ret = -ENOMEM; | |
2762 | err_out: | |
2763 | clear_probe_trace_events(*tevs, num_matched_functions); | |
2764 | zfree(tevs); | |
2765 | goto out; | |
2766 | } | |
1c1bc922 | 2767 | |
da15bd9d WN |
2768 | static int try_to_find_absolute_address(struct perf_probe_event *pev, |
2769 | struct probe_trace_event **tevs) | |
2770 | { | |
2771 | struct perf_probe_point *pp = &pev->point; | |
2772 | struct probe_trace_event *tev; | |
2773 | struct probe_trace_point *tp; | |
2774 | int i, err; | |
2775 | ||
2776 | if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) | |
2777 | return -EINVAL; | |
2778 | if (perf_probe_event_need_dwarf(pev)) | |
2779 | return -EINVAL; | |
2780 | ||
2781 | /* | |
2782 | * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at | |
2783 | * absolute address. | |
2784 | * | |
2785 | * Only one tev can be generated by this. | |
2786 | */ | |
2787 | *tevs = zalloc(sizeof(*tev)); | |
2788 | if (!*tevs) | |
2789 | return -ENOMEM; | |
2790 | ||
2791 | tev = *tevs; | |
2792 | tp = &tev->point; | |
2793 | ||
2794 | /* | |
2795 | * Don't use tp->offset, use address directly, because | |
2796 | * in synthesize_probe_trace_command() address cannot be | |
2797 | * zero. | |
2798 | */ | |
2799 | tp->address = pev->point.abs_address; | |
2800 | tp->retprobe = pp->retprobe; | |
2801 | tev->uprobes = pev->uprobes; | |
2802 | ||
2803 | err = -ENOMEM; | |
2804 | /* | |
2805 | * Give it a '0x' leading symbol name. | |
2806 | * In __add_probe_trace_events, a NULL symbol is interpreted as | |
2807 | * invalud. | |
2808 | */ | |
2809 | if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) | |
2810 | goto errout; | |
2811 | ||
2812 | /* For kprobe, check range */ | |
2813 | if ((!tev->uprobes) && | |
2814 | (kprobe_warn_out_range(tev->point.symbol, | |
2815 | tev->point.address))) { | |
2816 | err = -EACCES; | |
2817 | goto errout; | |
2818 | } | |
2819 | ||
2820 | if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) | |
2821 | goto errout; | |
2822 | ||
2823 | if (pev->target) { | |
2824 | tp->module = strdup(pev->target); | |
2825 | if (!tp->module) | |
2826 | goto errout; | |
2827 | } | |
2828 | ||
2829 | if (tev->group) { | |
2830 | tev->group = strdup(pev->group); | |
2831 | if (!tev->group) | |
2832 | goto errout; | |
2833 | } | |
2834 | ||
2835 | if (pev->event) { | |
2836 | tev->event = strdup(pev->event); | |
2837 | if (!tev->event) | |
2838 | goto errout; | |
2839 | } | |
2840 | ||
2841 | tev->nargs = pev->nargs; | |
2842 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
2843 | if (!tev->args) { | |
2844 | err = -ENOMEM; | |
2845 | goto errout; | |
2846 | } | |
2847 | for (i = 0; i < tev->nargs; i++) | |
2848 | copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); | |
2849 | ||
2850 | return 1; | |
2851 | ||
2852 | errout: | |
2853 | if (*tevs) { | |
2854 | clear_probe_trace_events(*tevs, 1); | |
2855 | *tevs = NULL; | |
2856 | } | |
2857 | return err; | |
2858 | } | |
2859 | ||
d5c2e2c1 NR |
2860 | bool __weak arch__prefers_symtab(void) { return false; } |
2861 | ||
bc062230 MH |
2862 | static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, |
2863 | struct probe_trace_event **tevs) | |
2864 | { | |
2865 | struct probe_cache *cache; | |
2866 | struct probe_cache_entry *entry; | |
2867 | struct probe_trace_event *tev; | |
2868 | struct str_node *node; | |
2869 | int ret, i; | |
2870 | ||
2871 | cache = probe_cache__new(pev->target); | |
2872 | if (!cache) | |
2873 | return 0; | |
2874 | ||
2875 | entry = probe_cache__find(cache, pev); | |
2876 | if (!entry) { | |
2877 | ret = 0; | |
2878 | goto out; | |
2879 | } | |
2880 | ||
2881 | ret = strlist__nr_entries(entry->tevlist); | |
2882 | if (ret > probe_conf.max_probes) { | |
2883 | pr_debug("Too many entries matched in the cache of %s\n", | |
2884 | pev->target ? : "kernel"); | |
2885 | ret = -E2BIG; | |
2886 | goto out; | |
2887 | } | |
2888 | ||
2889 | *tevs = zalloc(ret * sizeof(*tev)); | |
2890 | if (!*tevs) { | |
2891 | ret = -ENOMEM; | |
2892 | goto out; | |
2893 | } | |
2894 | ||
2895 | i = 0; | |
2896 | strlist__for_each_entry(node, entry->tevlist) { | |
2897 | tev = &(*tevs)[i++]; | |
2898 | ret = parse_probe_trace_command(node->s, tev); | |
2899 | if (ret < 0) | |
2900 | goto out; | |
2901 | /* Set the uprobes attribute as same as original */ | |
2902 | tev->uprobes = pev->uprobes; | |
2903 | } | |
2904 | ret = i; | |
2905 | ||
2906 | out: | |
2907 | probe_cache__delete(cache); | |
2908 | return ret; | |
2909 | } | |
2910 | ||
eb948e50 | 2911 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 2912 | struct probe_trace_event **tevs) |
eb948e50 MH |
2913 | { |
2914 | int ret; | |
2915 | ||
2a12ec13 MH |
2916 | if (!pev->group) { |
2917 | /* Set group name if not given */ | |
2918 | if (!pev->uprobes) { | |
2919 | pev->group = strdup(PERFPROBE_GROUP); | |
2920 | ret = pev->group ? 0 : -ENOMEM; | |
2921 | } else | |
2922 | ret = convert_exec_to_group(pev->target, &pev->group); | |
eb948e50 MH |
2923 | if (ret != 0) { |
2924 | pr_warning("Failed to make a group name.\n"); | |
2925 | return ret; | |
2926 | } | |
02b95dad | 2927 | } |
e334016f | 2928 | |
da15bd9d WN |
2929 | ret = try_to_find_absolute_address(pev, tevs); |
2930 | if (ret > 0) | |
2931 | return ret; | |
2932 | ||
bc062230 MH |
2933 | /* At first, we need to lookup cache entry */ |
2934 | ret = find_probe_trace_events_from_cache(pev, tevs); | |
2935 | if (ret > 0) | |
2936 | return ret; /* Found in probe cache */ | |
2937 | ||
d5c2e2c1 | 2938 | if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) { |
ddb2f58f | 2939 | ret = find_probe_trace_events_from_map(pev, tevs); |
d5c2e2c1 NR |
2940 | if (ret > 0) |
2941 | return ret; /* Found in symbol table */ | |
2942 | } | |
2943 | ||
eb948e50 | 2944 | /* Convert perf_probe_event with debuginfo */ |
ddb2f58f | 2945 | ret = try_to_find_probe_trace_events(pev, tevs); |
eb948e50 MH |
2946 | if (ret != 0) |
2947 | return ret; /* Found in debuginfo or got an error */ | |
2948 | ||
ddb2f58f | 2949 | return find_probe_trace_events_from_map(pev, tevs); |
4235b045 MH |
2950 | } |
2951 | ||
12fae5ef | 2952 | int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
4235b045 | 2953 | { |
844dffa5 | 2954 | int i, ret; |
4235b045 | 2955 | |
4235b045 MH |
2956 | /* Loop 1: convert all events */ |
2957 | for (i = 0; i < npevs; i++) { | |
b031220d | 2958 | /* Init kprobe blacklist if needed */ |
12fae5ef | 2959 | if (!pevs[i].uprobes) |
b031220d | 2960 | kprobe_blacklist__init(); |
4235b045 | 2961 | /* Convert with or without debuginfo */ |
12fae5ef | 2962 | ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); |
146a1439 | 2963 | if (ret < 0) |
844dffa5 | 2964 | return ret; |
12fae5ef | 2965 | pevs[i].ntevs = ret; |
e0faa8d3 | 2966 | } |
b031220d MH |
2967 | /* This just release blacklist only if allocated */ |
2968 | kprobe_blacklist__release(); | |
e0faa8d3 | 2969 | |
844dffa5 NK |
2970 | return 0; |
2971 | } | |
2972 | ||
12fae5ef | 2973 | int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
2974 | { |
2975 | int i, ret = 0; | |
2976 | ||
4235b045 | 2977 | /* Loop 2: add all events */ |
8635bf6e | 2978 | for (i = 0; i < npevs; i++) { |
12fae5ef WN |
2979 | ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, |
2980 | pevs[i].ntevs, | |
ddb2f58f | 2981 | probe_conf.force_add); |
fbee632d ACM |
2982 | if (ret < 0) |
2983 | break; | |
2984 | } | |
844dffa5 NK |
2985 | return ret; |
2986 | } | |
2987 | ||
12fae5ef | 2988 | void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
2989 | { |
2990 | int i, j; | |
2991 | ||
449e5b24 MH |
2992 | /* Loop 3: cleanup and free trace events */ |
2993 | for (i = 0; i < npevs; i++) { | |
12fae5ef WN |
2994 | for (j = 0; j < pevs[i].ntevs; j++) |
2995 | clear_probe_trace_event(&pevs[i].tevs[j]); | |
2996 | zfree(&pevs[i].tevs); | |
2997 | pevs[i].ntevs = 0; | |
a43aac29 | 2998 | clear_perf_probe_event(&pevs[i]); |
449e5b24 | 2999 | } |
844dffa5 NK |
3000 | } |
3001 | ||
3002 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) | |
3003 | { | |
3004 | int ret; | |
844dffa5 | 3005 | |
9bae1e8c NK |
3006 | ret = init_probe_symbol_maps(pevs->uprobes); |
3007 | if (ret < 0) | |
3008 | return ret; | |
3009 | ||
12fae5ef | 3010 | ret = convert_perf_probe_events(pevs, npevs); |
844dffa5 | 3011 | if (ret == 0) |
12fae5ef | 3012 | ret = apply_perf_probe_events(pevs, npevs); |
844dffa5 | 3013 | |
12fae5ef | 3014 | cleanup_perf_probe_events(pevs, npevs); |
146a1439 | 3015 | |
9bae1e8c | 3016 | exit_probe_symbol_maps(); |
146a1439 | 3017 | return ret; |
e0faa8d3 MH |
3018 | } |
3019 | ||
307a464b | 3020 | int del_perf_probe_events(struct strfilter *filter) |
fa28244d | 3021 | { |
307a464b | 3022 | int ret, ret2, ufd = -1, kfd = -1; |
307a464b MH |
3023 | char *str = strfilter__string(filter); |
3024 | ||
3025 | if (!str) | |
3026 | return -EINVAL; | |
3027 | ||
fa28244d | 3028 | /* Get current event names */ |
92f6c72e MH |
3029 | ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); |
3030 | if (ret < 0) | |
3031 | goto out; | |
467ec085 | 3032 | |
92f6c72e | 3033 | ret = probe_file__del_events(kfd, filter); |
307a464b | 3034 | if (ret < 0 && ret != -ENOENT) |
225466f1 | 3035 | goto error; |
225466f1 | 3036 | |
92f6c72e | 3037 | ret2 = probe_file__del_events(ufd, filter); |
dddc7ee3 | 3038 | if (ret2 < 0 && ret2 != -ENOENT) { |
307a464b | 3039 | ret = ret2; |
dddc7ee3 MH |
3040 | goto error; |
3041 | } | |
dddc7ee3 | 3042 | ret = 0; |
225466f1 SD |
3043 | |
3044 | error: | |
92f6c72e | 3045 | if (kfd >= 0) |
225466f1 | 3046 | close(kfd); |
92f6c72e | 3047 | if (ufd >= 0) |
225466f1 | 3048 | close(ufd); |
92f6c72e | 3049 | out: |
307a464b | 3050 | free(str); |
146a1439 MH |
3051 | |
3052 | return ret; | |
fa28244d | 3053 | } |
225466f1 | 3054 | |
3c42258c MH |
3055 | /* TODO: don't use a global variable for filter ... */ |
3056 | static struct strfilter *available_func_filter; | |
fa28244d | 3057 | |
e80711ca | 3058 | /* |
3c42258c MH |
3059 | * If a symbol corresponds to a function with global binding and |
3060 | * matches filter return 0. For all others return 1. | |
e80711ca | 3061 | */ |
1d037ca1 | 3062 | static int filter_available_functions(struct map *map __maybe_unused, |
3c42258c | 3063 | struct symbol *sym) |
e80711ca | 3064 | { |
e578da3b | 3065 | if (strfilter__compare(available_func_filter, sym->name)) |
3c42258c MH |
3066 | return 0; |
3067 | return 1; | |
e80711ca MH |
3068 | } |
3069 | ||
2df58634 MH |
3070 | int show_available_funcs(const char *target, struct strfilter *_filter, |
3071 | bool user) | |
e80711ca MH |
3072 | { |
3073 | struct map *map; | |
3074 | int ret; | |
3075 | ||
9bae1e8c | 3076 | ret = init_probe_symbol_maps(user); |
e80711ca MH |
3077 | if (ret < 0) |
3078 | return ret; | |
3079 | ||
2df58634 MH |
3080 | /* Get a symbol map */ |
3081 | if (user) | |
3082 | map = dso__new_map(target); | |
3083 | else | |
3084 | map = kernel_get_module_map(target); | |
e80711ca | 3085 | if (!map) { |
2df58634 | 3086 | pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); |
e80711ca MH |
3087 | return -EINVAL; |
3088 | } | |
225466f1 | 3089 | |
2df58634 | 3090 | /* Load symbols with given filter */ |
3c42258c | 3091 | available_func_filter = _filter; |
2df58634 MH |
3092 | if (map__load(map, filter_available_functions)) { |
3093 | pr_err("Failed to load symbols in %s\n", (target) ? : "kernel"); | |
3094 | goto end; | |
3095 | } | |
3096 | if (!dso__sorted_by_name(map->dso, map->type)) | |
3097 | dso__sort_by_name(map->dso, map->type); | |
225466f1 | 3098 | |
2df58634 MH |
3099 | /* Show all (filtered) symbols */ |
3100 | setup_pager(); | |
3101 | dso__fprintf_symbols_by_name(map->dso, map->type, stdout); | |
3102 | end: | |
3103 | if (user) { | |
84c2cafa | 3104 | map__put(map); |
2df58634 | 3105 | } |
9bae1e8c | 3106 | exit_probe_symbol_maps(); |
225466f1 | 3107 | |
2df58634 | 3108 | return ret; |
225466f1 SD |
3109 | } |
3110 | ||
da15bd9d WN |
3111 | int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, |
3112 | struct perf_probe_arg *pvar) | |
3113 | { | |
3114 | tvar->value = strdup(pvar->var); | |
3115 | if (tvar->value == NULL) | |
3116 | return -ENOMEM; | |
3117 | if (pvar->type) { | |
3118 | tvar->type = strdup(pvar->type); | |
3119 | if (tvar->type == NULL) | |
3120 | return -ENOMEM; | |
3121 | } | |
3122 | if (pvar->name) { | |
3123 | tvar->name = strdup(pvar->name); | |
3124 | if (tvar->name == NULL) | |
3125 | return -ENOMEM; | |
3126 | } else | |
3127 | tvar->name = NULL; | |
3128 | return 0; | |
3129 | } |