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 | ||
4b4da7f7 | 70 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp); |
ee45b6c2 | 71 | static struct machine *host_machine; |
e0faa8d3 | 72 | |
469b9b88 | 73 | /* Initialize symbol maps and path of vmlinux/modules */ |
9bae1e8c | 74 | int init_probe_symbol_maps(bool user_only) |
e0faa8d3 | 75 | { |
146a1439 MH |
76 | int ret; |
77 | ||
e0faa8d3 | 78 | symbol_conf.sort_by_name = true; |
680d926a | 79 | symbol_conf.allow_aliases = true; |
0a7e6d1b | 80 | ret = symbol__init(NULL); |
146a1439 MH |
81 | if (ret < 0) { |
82 | pr_debug("Failed to init symbol map.\n"); | |
83 | goto out; | |
84 | } | |
e0faa8d3 | 85 | |
ee45b6c2 MH |
86 | if (host_machine || user_only) /* already initialized */ |
87 | return 0; | |
d28c6223 | 88 | |
ee45b6c2 MH |
89 | if (symbol_conf.vmlinux_name) |
90 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
91 | ||
92 | host_machine = machine__new_host(); | |
93 | if (!host_machine) { | |
94 | pr_debug("machine__new_host() failed.\n"); | |
95 | symbol__exit(); | |
96 | ret = -1; | |
469b9b88 | 97 | } |
146a1439 MH |
98 | out: |
99 | if (ret < 0) | |
100 | pr_warning("Failed to init vmlinux path.\n"); | |
101 | return ret; | |
e0faa8d3 MH |
102 | } |
103 | ||
9bae1e8c | 104 | void exit_probe_symbol_maps(void) |
ee45b6c2 MH |
105 | { |
106 | if (host_machine) { | |
107 | machine__delete(host_machine); | |
108 | host_machine = NULL; | |
109 | } | |
110 | symbol__exit(); | |
111 | } | |
112 | ||
469b9b88 MH |
113 | static struct symbol *__find_kernel_function_by_name(const char *name, |
114 | struct map **mapp) | |
115 | { | |
ee45b6c2 | 116 | return machine__find_kernel_function_by_name(host_machine, name, mapp, |
469b9b88 MH |
117 | NULL); |
118 | } | |
119 | ||
8f33f7de MH |
120 | static struct symbol *__find_kernel_function(u64 addr, struct map **mapp) |
121 | { | |
122 | return machine__find_kernel_function(host_machine, addr, mapp, NULL); | |
123 | } | |
124 | ||
125 | static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void) | |
126 | { | |
127 | /* kmap->ref_reloc_sym should be set if host_machine is initialized */ | |
128 | struct kmap *kmap; | |
a5e813c6 | 129 | struct map *map = machine__kernel_map(host_machine); |
8f33f7de | 130 | |
77e65977 | 131 | if (map__load(map, NULL) < 0) |
8f33f7de MH |
132 | return NULL; |
133 | ||
77e65977 | 134 | kmap = map__kmap(map); |
ba92732e WN |
135 | if (!kmap) |
136 | return NULL; | |
8f33f7de MH |
137 | return kmap->ref_reloc_sym; |
138 | } | |
139 | ||
9b239a12 MH |
140 | static int kernel_get_symbol_address_by_name(const char *name, u64 *addr, |
141 | bool reloc, bool reladdr) | |
8f33f7de MH |
142 | { |
143 | struct ref_reloc_sym *reloc_sym; | |
144 | struct symbol *sym; | |
145 | struct map *map; | |
146 | ||
147 | /* ref_reloc_sym is just a label. Need a special fix*/ | |
148 | reloc_sym = kernel_get_ref_reloc_sym(); | |
149 | if (reloc_sym && strcmp(name, reloc_sym->name) == 0) | |
9b239a12 | 150 | *addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr; |
8f33f7de MH |
151 | else { |
152 | sym = __find_kernel_function_by_name(name, &map); | |
9b239a12 MH |
153 | if (!sym) |
154 | return -ENOENT; | |
155 | *addr = map->unmap_ip(map, sym->start) - | |
156 | ((reloc) ? 0 : map->reloc) - | |
157 | ((reladdr) ? map->start : 0); | |
8f33f7de MH |
158 | } |
159 | return 0; | |
160 | } | |
161 | ||
e80711ca MH |
162 | static struct map *kernel_get_module_map(const char *module) |
163 | { | |
ee45b6c2 | 164 | struct map_groups *grp = &host_machine->kmaps; |
1eee78ae | 165 | struct maps *maps = &grp->maps[MAP__FUNCTION]; |
4bb7123d | 166 | struct map *pos; |
e80711ca | 167 | |
14a8fd7c MH |
168 | /* A file path -- this is an offline module */ |
169 | if (module && strchr(module, '/')) | |
9f2de315 | 170 | return machine__findnew_module_map(host_machine, 0, module); |
14a8fd7c | 171 | |
e80711ca MH |
172 | if (!module) |
173 | module = "kernel"; | |
174 | ||
4bb7123d | 175 | for (pos = maps__first(maps); pos; pos = map__next(pos)) { |
e80711ca MH |
176 | if (strncmp(pos->dso->short_name + 1, module, |
177 | pos->dso->short_name_len - 2) == 0) { | |
178 | return pos; | |
179 | } | |
180 | } | |
181 | return NULL; | |
182 | } | |
183 | ||
9b118aca MH |
184 | static struct map *get_target_map(const char *target, bool user) |
185 | { | |
186 | /* Init maps of given executable or kernel */ | |
187 | if (user) | |
188 | return dso__new_map(target); | |
189 | else | |
190 | return kernel_get_module_map(target); | |
191 | } | |
192 | ||
193 | static void put_target_map(struct map *map, bool user) | |
194 | { | |
195 | if (map && user) { | |
196 | /* Only the user map needs to be released */ | |
84c2cafa | 197 | map__put(map); |
9b118aca MH |
198 | } |
199 | } | |
200 | ||
201 | ||
fb7345bb MH |
202 | static int convert_exec_to_group(const char *exec, char **result) |
203 | { | |
204 | char *ptr1, *ptr2, *exec_copy; | |
205 | char buf[64]; | |
206 | int ret; | |
207 | ||
208 | exec_copy = strdup(exec); | |
209 | if (!exec_copy) | |
210 | return -ENOMEM; | |
211 | ||
212 | ptr1 = basename(exec_copy); | |
213 | if (!ptr1) { | |
214 | ret = -EINVAL; | |
215 | goto out; | |
216 | } | |
217 | ||
218 | ptr2 = strpbrk(ptr1, "-._"); | |
219 | if (ptr2) | |
220 | *ptr2 = '\0'; | |
221 | ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); | |
222 | if (ret < 0) | |
223 | goto out; | |
224 | ||
225 | *result = strdup(buf); | |
226 | ret = *result ? 0 : -ENOMEM; | |
227 | ||
228 | out: | |
229 | free(exec_copy); | |
230 | return ret; | |
231 | } | |
232 | ||
9b118aca MH |
233 | static void clear_perf_probe_point(struct perf_probe_point *pp) |
234 | { | |
235 | free(pp->file); | |
236 | free(pp->function); | |
237 | free(pp->lazy_line); | |
238 | } | |
239 | ||
eb948e50 MH |
240 | static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) |
241 | { | |
242 | int i; | |
243 | ||
244 | for (i = 0; i < ntevs; i++) | |
245 | clear_probe_trace_event(tevs + i); | |
246 | } | |
247 | ||
b031220d MH |
248 | static bool kprobe_blacklist__listed(unsigned long address); |
249 | static bool kprobe_warn_out_range(const char *symbol, unsigned long address) | |
250 | { | |
9b239a12 MH |
251 | u64 etext_addr = 0; |
252 | int ret; | |
7c31bb8c | 253 | |
b031220d | 254 | /* Get the address of _etext for checking non-probable text symbol */ |
9b239a12 MH |
255 | ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, |
256 | false, false); | |
7c31bb8c | 257 | |
9b239a12 | 258 | if (ret == 0 && etext_addr < address) |
b031220d MH |
259 | pr_warning("%s is out of .text, skip it.\n", symbol); |
260 | else if (kprobe_blacklist__listed(address)) | |
261 | pr_warning("%s is blacklisted function, skip it.\n", symbol); | |
262 | else | |
263 | return false; | |
264 | ||
265 | return true; | |
266 | } | |
267 | ||
89fe808a | 268 | #ifdef HAVE_DWARF_SUPPORT |
60fb7742 WN |
269 | |
270 | static int kernel_get_module_dso(const char *module, struct dso **pdso) | |
271 | { | |
272 | struct dso *dso; | |
273 | struct map *map; | |
274 | const char *vmlinux_name; | |
275 | int ret = 0; | |
276 | ||
277 | if (module) { | |
266fa2b2 ACM |
278 | char module_name[128]; |
279 | ||
280 | snprintf(module_name, sizeof(module_name), "[%s]", module); | |
281 | map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name); | |
282 | if (map) { | |
283 | dso = map->dso; | |
284 | goto found; | |
60fb7742 WN |
285 | } |
286 | pr_debug("Failed to find module %s.\n", module); | |
287 | return -ENOENT; | |
288 | } | |
289 | ||
a5e813c6 | 290 | map = machine__kernel_map(host_machine); |
60fb7742 WN |
291 | dso = map->dso; |
292 | ||
293 | vmlinux_name = symbol_conf.vmlinux_name; | |
294 | dso->load_errno = 0; | |
295 | if (vmlinux_name) | |
296 | ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL); | |
297 | else | |
298 | ret = dso__load_vmlinux_path(dso, map, NULL); | |
299 | found: | |
300 | *pdso = dso; | |
301 | return ret; | |
302 | } | |
303 | ||
9b118aca MH |
304 | /* |
305 | * Some binaries like glibc have special symbols which are on the symbol | |
306 | * table, but not in the debuginfo. If we can find the address of the | |
307 | * symbol from map, we can translate the address back to the probe point. | |
308 | */ | |
309 | static int find_alternative_probe_point(struct debuginfo *dinfo, | |
310 | struct perf_probe_point *pp, | |
311 | struct perf_probe_point *result, | |
312 | const char *target, bool uprobes) | |
313 | { | |
314 | struct map *map = NULL; | |
315 | struct symbol *sym; | |
316 | u64 address = 0; | |
317 | int ret = -ENOENT; | |
318 | ||
319 | /* This can work only for function-name based one */ | |
320 | if (!pp->function || pp->file) | |
321 | return -ENOTSUP; | |
322 | ||
323 | map = get_target_map(target, uprobes); | |
324 | if (!map) | |
325 | return -EINVAL; | |
326 | ||
327 | /* Find the address of given function */ | |
328 | map__for_each_symbol_by_name(map, pp->function, sym) { | |
e6d7c91c MH |
329 | if (uprobes) |
330 | address = sym->start; | |
331 | else | |
332 | address = map->unmap_ip(map, sym->start); | |
e578da3b | 333 | break; |
9b118aca MH |
334 | } |
335 | if (!address) { | |
336 | ret = -ENOENT; | |
337 | goto out; | |
338 | } | |
f6c15621 WN |
339 | pr_debug("Symbol %s address found : %" PRIx64 "\n", |
340 | pp->function, address); | |
9b118aca MH |
341 | |
342 | ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, | |
343 | result); | |
344 | if (ret <= 0) | |
345 | ret = (!ret) ? -ENOENT : ret; | |
346 | else { | |
347 | result->offset += pp->offset; | |
348 | result->line += pp->line; | |
9d7b45c5 | 349 | result->retprobe = pp->retprobe; |
9b118aca MH |
350 | ret = 0; |
351 | } | |
352 | ||
353 | out: | |
354 | put_target_map(map, uprobes); | |
355 | return ret; | |
356 | ||
357 | } | |
358 | ||
359 | static int get_alternative_probe_event(struct debuginfo *dinfo, | |
360 | struct perf_probe_event *pev, | |
44225521 | 361 | struct perf_probe_point *tmp) |
9b118aca MH |
362 | { |
363 | int ret; | |
364 | ||
365 | memcpy(tmp, &pev->point, sizeof(*tmp)); | |
366 | memset(&pev->point, 0, sizeof(pev->point)); | |
367 | ret = find_alternative_probe_point(dinfo, tmp, &pev->point, | |
44225521 | 368 | pev->target, pev->uprobes); |
9b118aca MH |
369 | if (ret < 0) |
370 | memcpy(&pev->point, tmp, sizeof(*tmp)); | |
371 | ||
372 | return ret; | |
373 | } | |
a15ad2f5 | 374 | |
811dd2ae MH |
375 | static int get_alternative_line_range(struct debuginfo *dinfo, |
376 | struct line_range *lr, | |
377 | const char *target, bool user) | |
378 | { | |
6d4a4896 DA |
379 | struct perf_probe_point pp = { .function = lr->function, |
380 | .file = lr->file, | |
381 | .line = lr->start }; | |
382 | struct perf_probe_point result; | |
811dd2ae MH |
383 | int ret, len = 0; |
384 | ||
6d4a4896 DA |
385 | memset(&result, 0, sizeof(result)); |
386 | ||
811dd2ae MH |
387 | if (lr->end != INT_MAX) |
388 | len = lr->end - lr->start; | |
389 | ret = find_alternative_probe_point(dinfo, &pp, &result, | |
390 | target, user); | |
391 | if (!ret) { | |
392 | lr->function = result.function; | |
393 | lr->file = result.file; | |
394 | lr->start = result.line; | |
395 | if (lr->end != INT_MAX) | |
396 | lr->end = lr->start + len; | |
397 | clear_perf_probe_point(&pp); | |
398 | } | |
399 | return ret; | |
400 | } | |
401 | ||
ff741783 | 402 | /* Open new debuginfo of given module */ |
92561cb7 | 403 | static struct debuginfo *open_debuginfo(const char *module, bool silent) |
e0faa8d3 | 404 | { |
a15ad2f5 | 405 | const char *path = module; |
419e8738 MH |
406 | char reason[STRERR_BUFSIZE]; |
407 | struct debuginfo *ret = NULL; | |
408 | struct dso *dso = NULL; | |
409 | int err; | |
ff741783 | 410 | |
a15ad2f5 | 411 | if (!module || !strchr(module, '/')) { |
419e8738 MH |
412 | err = kernel_get_module_dso(module, &dso); |
413 | if (err < 0) { | |
414 | if (!dso || dso->load_errno == 0) { | |
415 | if (!strerror_r(-err, reason, STRERR_BUFSIZE)) | |
416 | strcpy(reason, "(unknown)"); | |
417 | } else | |
418 | dso__strerror_load(dso, reason, STRERR_BUFSIZE); | |
92561cb7 | 419 | if (!silent) |
419e8738 MH |
420 | pr_err("Failed to find the path for %s: %s\n", |
421 | module ?: "kernel", reason); | |
14a8fd7c MH |
422 | return NULL; |
423 | } | |
419e8738 | 424 | path = dso->long_name; |
e0faa8d3 | 425 | } |
92561cb7 MH |
426 | ret = debuginfo__new(path); |
427 | if (!ret && !silent) { | |
428 | pr_warning("The %s file has no debug information.\n", path); | |
429 | if (!module || !strtailcmp(path, ".ko")) | |
430 | pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); | |
431 | else | |
432 | pr_warning("Rebuild with -g, "); | |
433 | pr_warning("or install an appropriate debuginfo package.\n"); | |
434 | } | |
435 | return ret; | |
e0faa8d3 | 436 | } |
4b4da7f7 | 437 | |
7737af01 MH |
438 | /* For caching the last debuginfo */ |
439 | static struct debuginfo *debuginfo_cache; | |
440 | static char *debuginfo_cache_path; | |
441 | ||
442 | static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) | |
443 | { | |
20f49859 MH |
444 | const char *path = module; |
445 | ||
446 | /* If the module is NULL, it should be the kernel. */ | |
447 | if (!module) | |
448 | path = "kernel"; | |
449 | ||
450 | if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) | |
7737af01 MH |
451 | goto out; |
452 | ||
453 | /* Copy module path */ | |
454 | free(debuginfo_cache_path); | |
20f49859 MH |
455 | debuginfo_cache_path = strdup(path); |
456 | if (!debuginfo_cache_path) { | |
457 | debuginfo__delete(debuginfo_cache); | |
458 | debuginfo_cache = NULL; | |
459 | goto out; | |
7737af01 MH |
460 | } |
461 | ||
462 | debuginfo_cache = open_debuginfo(module, silent); | |
463 | if (!debuginfo_cache) | |
464 | zfree(&debuginfo_cache_path); | |
465 | out: | |
466 | return debuginfo_cache; | |
467 | } | |
468 | ||
469 | static void debuginfo_cache__exit(void) | |
470 | { | |
471 | debuginfo__delete(debuginfo_cache); | |
472 | debuginfo_cache = NULL; | |
473 | zfree(&debuginfo_cache_path); | |
474 | } | |
475 | ||
92561cb7 | 476 | |
99ca4233 MH |
477 | static int get_text_start_address(const char *exec, unsigned long *address) |
478 | { | |
479 | Elf *elf; | |
480 | GElf_Ehdr ehdr; | |
481 | GElf_Shdr shdr; | |
482 | int fd, ret = -ENOENT; | |
483 | ||
484 | fd = open(exec, O_RDONLY); | |
485 | if (fd < 0) | |
486 | return -errno; | |
487 | ||
488 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
489 | if (elf == NULL) | |
490 | return -EINVAL; | |
491 | ||
492 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
493 | goto out; | |
494 | ||
495 | if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) | |
496 | goto out; | |
497 | ||
498 | *address = shdr.sh_addr - shdr.sh_offset; | |
499 | ret = 0; | |
500 | out: | |
501 | elf_end(elf); | |
502 | return ret; | |
503 | } | |
504 | ||
5a6f6314 MH |
505 | /* |
506 | * Convert trace point to probe point with debuginfo | |
507 | */ | |
508 | static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, | |
509 | struct perf_probe_point *pp, | |
510 | bool is_kprobe) | |
511 | { | |
512 | struct debuginfo *dinfo = NULL; | |
513 | unsigned long stext = 0; | |
514 | u64 addr = tp->address; | |
515 | int ret = -ENOENT; | |
516 | ||
517 | /* convert the address to dwarf address */ | |
518 | if (!is_kprobe) { | |
519 | if (!addr) { | |
520 | ret = -EINVAL; | |
521 | goto error; | |
522 | } | |
523 | ret = get_text_start_address(tp->module, &stext); | |
524 | if (ret < 0) | |
525 | goto error; | |
526 | addr += stext; | |
e486367f | 527 | } else if (tp->symbol) { |
9b239a12 MH |
528 | /* If the module is given, this returns relative address */ |
529 | ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, | |
530 | false, !!tp->module); | |
531 | if (ret != 0) | |
5a6f6314 MH |
532 | goto error; |
533 | addr += tp->offset; | |
534 | } | |
535 | ||
536 | pr_debug("try to find information at %" PRIx64 " in %s\n", addr, | |
537 | tp->module ? : "kernel"); | |
538 | ||
7737af01 MH |
539 | dinfo = debuginfo_cache__open(tp->module, verbose == 0); |
540 | if (dinfo) | |
5a6f6314 MH |
541 | ret = debuginfo__find_probe_point(dinfo, |
542 | (unsigned long)addr, pp); | |
7737af01 | 543 | else |
5a6f6314 | 544 | ret = -ENOENT; |
5a6f6314 MH |
545 | |
546 | if (ret > 0) { | |
547 | pp->retprobe = tp->retprobe; | |
548 | return 0; | |
549 | } | |
550 | error: | |
551 | pr_debug("Failed to find corresponding probes from debuginfo.\n"); | |
552 | return ret ? : -ENOENT; | |
553 | } | |
554 | ||
fb7345bb MH |
555 | static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, |
556 | int ntevs, const char *exec) | |
557 | { | |
558 | int i, ret = 0; | |
eb948e50 | 559 | unsigned long stext = 0; |
fb7345bb MH |
560 | |
561 | if (!exec) | |
562 | return 0; | |
563 | ||
564 | ret = get_text_start_address(exec, &stext); | |
565 | if (ret < 0) | |
566 | return ret; | |
567 | ||
568 | for (i = 0; i < ntevs && ret >= 0; i++) { | |
981a2379 | 569 | /* point.address is the addres of point.symbol + point.offset */ |
eb948e50 | 570 | tevs[i].point.address -= stext; |
fb7345bb | 571 | tevs[i].point.module = strdup(exec); |
eb948e50 | 572 | if (!tevs[i].point.module) { |
fb7345bb MH |
573 | ret = -ENOMEM; |
574 | break; | |
575 | } | |
576 | tevs[i].uprobes = true; | |
577 | } | |
578 | ||
579 | return ret; | |
580 | } | |
581 | ||
190b57fc MH |
582 | static int add_module_to_probe_trace_events(struct probe_trace_event *tevs, |
583 | int ntevs, const char *module) | |
584 | { | |
14a8fd7c MH |
585 | int i, ret = 0; |
586 | char *tmp; | |
587 | ||
588 | if (!module) | |
589 | return 0; | |
590 | ||
591 | tmp = strrchr(module, '/'); | |
592 | if (tmp) { | |
593 | /* This is a module path -- get the module name */ | |
594 | module = strdup(tmp + 1); | |
595 | if (!module) | |
596 | return -ENOMEM; | |
597 | tmp = strchr(module, '.'); | |
598 | if (tmp) | |
599 | *tmp = '\0'; | |
600 | tmp = (char *)module; /* For free() */ | |
601 | } | |
602 | ||
190b57fc MH |
603 | for (i = 0; i < ntevs; i++) { |
604 | tevs[i].point.module = strdup(module); | |
14a8fd7c MH |
605 | if (!tevs[i].point.module) { |
606 | ret = -ENOMEM; | |
607 | break; | |
608 | } | |
190b57fc | 609 | } |
14a8fd7c | 610 | |
f5385650 | 611 | free(tmp); |
14a8fd7c | 612 | return ret; |
190b57fc MH |
613 | } |
614 | ||
dfef99cd MH |
615 | /* Post processing the probe events */ |
616 | static int post_process_probe_trace_events(struct probe_trace_event *tevs, | |
617 | int ntevs, const char *module, | |
618 | bool uprobe) | |
619 | { | |
620 | struct ref_reloc_sym *reloc_sym; | |
621 | char *tmp; | |
5a51fcd1 | 622 | int i, skipped = 0; |
dfef99cd MH |
623 | |
624 | if (uprobe) | |
625 | return add_exec_to_probe_trace_events(tevs, ntevs, module); | |
626 | ||
627 | /* Note that currently ref_reloc_sym based probe is not for drivers */ | |
628 | if (module) | |
629 | return add_module_to_probe_trace_events(tevs, ntevs, module); | |
630 | ||
8f33f7de | 631 | reloc_sym = kernel_get_ref_reloc_sym(); |
dfef99cd MH |
632 | if (!reloc_sym) { |
633 | pr_warning("Relocated base symbol is not found!\n"); | |
634 | return -EINVAL; | |
635 | } | |
636 | ||
637 | for (i = 0; i < ntevs; i++) { | |
b031220d MH |
638 | if (!tevs[i].point.address || tevs[i].point.retprobe) |
639 | continue; | |
640 | /* If we found a wrong one, mark it by NULL symbol */ | |
641 | if (kprobe_warn_out_range(tevs[i].point.symbol, | |
642 | tevs[i].point.address)) { | |
643 | tmp = NULL; | |
644 | skipped++; | |
645 | } else { | |
646 | tmp = strdup(reloc_sym->name); | |
647 | if (!tmp) | |
648 | return -ENOMEM; | |
dfef99cd | 649 | } |
b031220d MH |
650 | /* If we have no realname, use symbol for it */ |
651 | if (!tevs[i].point.realname) | |
652 | tevs[i].point.realname = tevs[i].point.symbol; | |
653 | else | |
654 | free(tevs[i].point.symbol); | |
655 | tevs[i].point.symbol = tmp; | |
656 | tevs[i].point.offset = tevs[i].point.address - | |
657 | reloc_sym->unrelocated_addr; | |
dfef99cd | 658 | } |
5a51fcd1 | 659 | return skipped; |
dfef99cd MH |
660 | } |
661 | ||
4b4da7f7 | 662 | /* Try to find perf_probe_event with debuginfo */ |
0e60836b | 663 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 664 | struct probe_trace_event **tevs) |
4b4da7f7 MH |
665 | { |
666 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
9b118aca | 667 | struct perf_probe_point tmp; |
225466f1 | 668 | struct debuginfo *dinfo; |
190b57fc | 669 | int ntevs, ret = 0; |
4b4da7f7 | 670 | |
44225521 | 671 | dinfo = open_debuginfo(pev->target, !need_dwarf); |
ff741783 | 672 | if (!dinfo) { |
92561cb7 | 673 | if (need_dwarf) |
ff741783 | 674 | return -ENOENT; |
ff741783 | 675 | pr_debug("Could not open debuginfo. Try to use symbols.\n"); |
4b4da7f7 MH |
676 | return 0; |
677 | } | |
678 | ||
dfef99cd | 679 | pr_debug("Try to find probe point from debuginfo.\n"); |
ff741783 | 680 | /* Searching trace events corresponding to a probe event */ |
ddb2f58f | 681 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
ff741783 | 682 | |
9b118aca | 683 | if (ntevs == 0) { /* Not found, retry with an alternative */ |
44225521 | 684 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca | 685 | if (!ret) { |
ddb2f58f | 686 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
9b118aca MH |
687 | /* |
688 | * Write back to the original probe_event for | |
689 | * setting appropriate (user given) event name | |
690 | */ | |
691 | clear_perf_probe_point(&pev->point); | |
692 | memcpy(&pev->point, &tmp, sizeof(tmp)); | |
693 | } | |
694 | } | |
695 | ||
ff741783 | 696 | debuginfo__delete(dinfo); |
4b4da7f7 | 697 | |
146a1439 | 698 | if (ntevs > 0) { /* Succeeded to find trace events */ |
dfef99cd MH |
699 | pr_debug("Found %d probe_trace_events.\n", ntevs); |
700 | ret = post_process_probe_trace_events(*tevs, ntevs, | |
44225521 | 701 | pev->target, pev->uprobes); |
5a51fcd1 | 702 | if (ret < 0 || ret == ntevs) { |
981d05ad MH |
703 | clear_probe_trace_events(*tevs, ntevs); |
704 | zfree(tevs); | |
705 | } | |
5a51fcd1 MH |
706 | if (ret != ntevs) |
707 | return ret < 0 ? ret : ntevs; | |
708 | ntevs = 0; | |
709 | /* Fall through */ | |
146a1439 | 710 | } |
4b4da7f7 | 711 | |
146a1439 | 712 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
0687eba7 | 713 | pr_warning("Probe point '%s' not found.\n", |
146a1439 | 714 | synthesize_perf_probe_point(&pev->point)); |
0687eba7 | 715 | return -ENOENT; |
146a1439 MH |
716 | } |
717 | /* Error path : ntevs < 0 */ | |
15eca306 | 718 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
1c0bd0e8 WN |
719 | if (ntevs < 0) { |
720 | if (ntevs == -EBADF) | |
721 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
722 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
15eca306 | 723 | if (!need_dwarf) { |
0e43e5d2 | 724 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
725 | return 0; |
726 | } | |
4b4da7f7 | 727 | } |
15eca306 | 728 | return ntevs; |
4b4da7f7 MH |
729 | } |
730 | ||
731 | #define LINEBUF_SIZE 256 | |
732 | #define NR_ADDITIONAL_LINES 2 | |
733 | ||
fde52dbd | 734 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 | 735 | { |
5f03cba4 | 736 | char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; |
befe3414 FBH |
737 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
738 | const char *prefix = NULL; | |
4b4da7f7 | 739 | |
befe3414 | 740 | do { |
4b4da7f7 MH |
741 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
742 | goto error; | |
befe3414 FBH |
743 | if (skip) |
744 | continue; | |
745 | if (!prefix) { | |
746 | prefix = show_num ? "%7d " : " "; | |
747 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 748 | } |
befe3414 FBH |
749 | color_fprintf(stdout, color, "%s", buf); |
750 | ||
751 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 752 | |
fde52dbd | 753 | return 1; |
4b4da7f7 | 754 | error: |
fde52dbd | 755 | if (ferror(fp)) { |
5f03cba4 MH |
756 | pr_warning("File read error: %s\n", |
757 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
fde52dbd FBH |
758 | return -1; |
759 | } | |
760 | return 0; | |
761 | } | |
146a1439 | 762 | |
fde52dbd FBH |
763 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
764 | { | |
765 | int rv = __show_one_line(fp, l, skip, show_num); | |
766 | if (rv == 0) { | |
767 | pr_warning("Source file is shorter than expected.\n"); | |
768 | rv = -1; | |
769 | } | |
770 | return rv; | |
4b4da7f7 MH |
771 | } |
772 | ||
fde52dbd FBH |
773 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
774 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
775 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
776 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
777 | ||
4b4da7f7 MH |
778 | /* |
779 | * Show line-range always requires debuginfo to find source file and | |
780 | * line number. | |
781 | */ | |
811dd2ae MH |
782 | static int __show_line_range(struct line_range *lr, const char *module, |
783 | bool user) | |
4b4da7f7 | 784 | { |
d3b63d7a | 785 | int l = 1; |
5a62257a | 786 | struct int_node *ln; |
ff741783 | 787 | struct debuginfo *dinfo; |
4b4da7f7 | 788 | FILE *fp; |
ff741783 | 789 | int ret; |
7cf0b79e | 790 | char *tmp; |
5f03cba4 | 791 | char sbuf[STRERR_BUFSIZE]; |
4b4da7f7 MH |
792 | |
793 | /* Search a line range */ | |
92561cb7 MH |
794 | dinfo = open_debuginfo(module, false); |
795 | if (!dinfo) | |
ff741783 | 796 | return -ENOENT; |
146a1439 | 797 | |
ff741783 | 798 | ret = debuginfo__find_line_range(dinfo, lr); |
811dd2ae MH |
799 | if (!ret) { /* Not found, retry with an alternative */ |
800 | ret = get_alternative_line_range(dinfo, lr, module, user); | |
801 | if (!ret) | |
802 | ret = debuginfo__find_line_range(dinfo, lr); | |
803 | } | |
ff741783 | 804 | debuginfo__delete(dinfo); |
5ee05b88 | 805 | if (ret == 0 || ret == -ENOENT) { |
146a1439 MH |
806 | pr_warning("Specified source line is not found.\n"); |
807 | return -ENOENT; | |
808 | } else if (ret < 0) { | |
5ee05b88 | 809 | pr_warning("Debuginfo analysis failed.\n"); |
146a1439 MH |
810 | return ret; |
811 | } | |
4b4da7f7 | 812 | |
7cf0b79e MH |
813 | /* Convert source file path */ |
814 | tmp = lr->path; | |
6a330a3c | 815 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
a78604de HK |
816 | |
817 | /* Free old path when new path is assigned */ | |
818 | if (tmp != lr->path) | |
819 | free(tmp); | |
820 | ||
7cf0b79e | 821 | if (ret < 0) { |
5ee05b88 | 822 | pr_warning("Failed to find source file path.\n"); |
7cf0b79e MH |
823 | return ret; |
824 | } | |
825 | ||
4b4da7f7 MH |
826 | setup_pager(); |
827 | ||
828 | if (lr->function) | |
8737ebde | 829 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
4b4da7f7 MH |
830 | lr->start - lr->offset); |
831 | else | |
62c15fc4 | 832 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
833 | |
834 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
835 | if (fp == NULL) { |
836 | pr_warning("Failed to open %s: %s\n", lr->path, | |
5f03cba4 | 837 | strerror_r(errno, sbuf, sizeof(sbuf))); |
146a1439 MH |
838 | return -errno; |
839 | } | |
4b4da7f7 | 840 | /* Skip to starting line number */ |
44b81e92 | 841 | while (l < lr->start) { |
fde52dbd | 842 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
843 | if (ret < 0) |
844 | goto end; | |
845 | } | |
4b4da7f7 | 846 | |
5a62257a MH |
847 | intlist__for_each(ln, lr->line_list) { |
848 | for (; ln->i > l; l++) { | |
fde52dbd | 849 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
850 | if (ret < 0) |
851 | goto end; | |
852 | } | |
fde52dbd | 853 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
854 | if (ret < 0) |
855 | goto end; | |
4b4da7f7 MH |
856 | } |
857 | ||
858 | if (lr->end == INT_MAX) | |
859 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
860 | while (l <= lr->end) { |
861 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
862 | if (ret <= 0) | |
44b81e92 FBH |
863 | break; |
864 | } | |
146a1439 | 865 | end: |
4b4da7f7 | 866 | fclose(fp); |
146a1439 | 867 | return ret; |
4b4da7f7 MH |
868 | } |
869 | ||
2b394bc4 | 870 | int show_line_range(struct line_range *lr, const char *module, bool user) |
ee45b6c2 MH |
871 | { |
872 | int ret; | |
873 | ||
9bae1e8c | 874 | ret = init_probe_symbol_maps(user); |
ee45b6c2 MH |
875 | if (ret < 0) |
876 | return ret; | |
811dd2ae | 877 | ret = __show_line_range(lr, module, user); |
9bae1e8c | 878 | exit_probe_symbol_maps(); |
ee45b6c2 MH |
879 | |
880 | return ret; | |
881 | } | |
882 | ||
ff741783 MH |
883 | static int show_available_vars_at(struct debuginfo *dinfo, |
884 | struct perf_probe_event *pev, | |
ddb2f58f | 885 | struct strfilter *_filter) |
cf6eb489 MH |
886 | { |
887 | char *buf; | |
bd09d7b5 | 888 | int ret, i, nvars; |
cf6eb489 MH |
889 | struct str_node *node; |
890 | struct variable_list *vls = NULL, *vl; | |
9b118aca | 891 | struct perf_probe_point tmp; |
bd09d7b5 | 892 | const char *var; |
cf6eb489 MH |
893 | |
894 | buf = synthesize_perf_probe_point(&pev->point); | |
895 | if (!buf) | |
896 | return -EINVAL; | |
897 | pr_debug("Searching variables at %s\n", buf); | |
898 | ||
ddb2f58f | 899 | ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); |
9b118aca | 900 | if (!ret) { /* Not found, retry with an alternative */ |
44225521 | 901 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca MH |
902 | if (!ret) { |
903 | ret = debuginfo__find_available_vars_at(dinfo, pev, | |
ddb2f58f | 904 | &vls); |
9b118aca MH |
905 | /* Release the old probe_point */ |
906 | clear_perf_probe_point(&tmp); | |
907 | } | |
908 | } | |
bd09d7b5 | 909 | if (ret <= 0) { |
69e96eaa MH |
910 | if (ret == 0 || ret == -ENOENT) { |
911 | pr_err("Failed to find the address of %s\n", buf); | |
912 | ret = -ENOENT; | |
913 | } else | |
914 | pr_warning("Debuginfo analysis failed.\n"); | |
bd09d7b5 MH |
915 | goto end; |
916 | } | |
69e96eaa | 917 | |
bd09d7b5 MH |
918 | /* Some variables are found */ |
919 | fprintf(stdout, "Available variables at %s\n", buf); | |
920 | for (i = 0; i < ret; i++) { | |
921 | vl = &vls[i]; | |
922 | /* | |
923 | * A probe point might be converted to | |
924 | * several trace points. | |
925 | */ | |
926 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
927 | vl->point.offset); | |
74cf249d | 928 | zfree(&vl->point.symbol); |
bd09d7b5 MH |
929 | nvars = 0; |
930 | if (vl->vars) { | |
931 | strlist__for_each(node, vl->vars) { | |
932 | var = strchr(node->s, '\t') + 1; | |
933 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 934 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
935 | nvars++; |
936 | } | |
937 | } | |
938 | strlist__delete(vl->vars); | |
cf6eb489 | 939 | } |
bd09d7b5 MH |
940 | if (nvars == 0) |
941 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
942 | } | |
943 | free(vls); | |
944 | end: | |
cf6eb489 MH |
945 | free(buf); |
946 | return ret; | |
947 | } | |
948 | ||
949 | /* Show available variables on given probe point */ | |
950 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
ddb2f58f | 951 | struct strfilter *_filter) |
cf6eb489 | 952 | { |
ff741783 MH |
953 | int i, ret = 0; |
954 | struct debuginfo *dinfo; | |
cf6eb489 | 955 | |
9bae1e8c | 956 | ret = init_probe_symbol_maps(pevs->uprobes); |
cf6eb489 MH |
957 | if (ret < 0) |
958 | return ret; | |
959 | ||
44225521 | 960 | dinfo = open_debuginfo(pevs->target, false); |
ff741783 | 961 | if (!dinfo) { |
ee45b6c2 MH |
962 | ret = -ENOENT; |
963 | goto out; | |
ff741783 MH |
964 | } |
965 | ||
cf6eb489 MH |
966 | setup_pager(); |
967 | ||
ff741783 | 968 | for (i = 0; i < npevs && ret >= 0; i++) |
ddb2f58f | 969 | ret = show_available_vars_at(dinfo, &pevs[i], _filter); |
ff741783 MH |
970 | |
971 | debuginfo__delete(dinfo); | |
ee45b6c2 | 972 | out: |
9bae1e8c | 973 | exit_probe_symbol_maps(); |
cf6eb489 MH |
974 | return ret; |
975 | } | |
976 | ||
89fe808a | 977 | #else /* !HAVE_DWARF_SUPPORT */ |
4b4da7f7 | 978 | |
7737af01 MH |
979 | static void debuginfo_cache__exit(void) |
980 | { | |
981 | } | |
982 | ||
5a6f6314 MH |
983 | static int |
984 | find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, | |
985 | struct perf_probe_point *pp __maybe_unused, | |
986 | bool is_kprobe __maybe_unused) | |
4b4da7f7 | 987 | { |
5a6f6314 | 988 | return -ENOSYS; |
4b4da7f7 MH |
989 | } |
990 | ||
0e60836b | 991 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 992 | struct probe_trace_event **tevs __maybe_unused) |
4b4da7f7 | 993 | { |
146a1439 MH |
994 | if (perf_probe_event_need_dwarf(pev)) { |
995 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
996 | return -ENOSYS; | |
997 | } | |
225466f1 | 998 | |
4b4da7f7 MH |
999 | return 0; |
1000 | } | |
1001 | ||
1d037ca1 | 1002 | int show_line_range(struct line_range *lr __maybe_unused, |
2b394bc4 MH |
1003 | const char *module __maybe_unused, |
1004 | bool user __maybe_unused) | |
4b4da7f7 | 1005 | { |
146a1439 MH |
1006 | pr_warning("Debuginfo-analysis is not supported.\n"); |
1007 | return -ENOSYS; | |
4b4da7f7 MH |
1008 | } |
1009 | ||
1d037ca1 | 1010 | int show_available_vars(struct perf_probe_event *pevs __maybe_unused, |
ddb2f58f MH |
1011 | int npevs __maybe_unused, |
1012 | struct strfilter *filter __maybe_unused) | |
cf6eb489 MH |
1013 | { |
1014 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1015 | return -ENOSYS; | |
1016 | } | |
e0faa8d3 MH |
1017 | #endif |
1018 | ||
e53b00d3 MH |
1019 | void line_range__clear(struct line_range *lr) |
1020 | { | |
e53b00d3 MH |
1021 | free(lr->function); |
1022 | free(lr->file); | |
1023 | free(lr->path); | |
1024 | free(lr->comp_dir); | |
5a62257a | 1025 | intlist__delete(lr->line_list); |
e53b00d3 MH |
1026 | memset(lr, 0, sizeof(*lr)); |
1027 | } | |
1028 | ||
5a62257a | 1029 | int line_range__init(struct line_range *lr) |
e53b00d3 MH |
1030 | { |
1031 | memset(lr, 0, sizeof(*lr)); | |
5a62257a MH |
1032 | lr->line_list = intlist__new(NULL); |
1033 | if (!lr->line_list) | |
1034 | return -ENOMEM; | |
1035 | else | |
1036 | return 0; | |
e53b00d3 MH |
1037 | } |
1038 | ||
21dd9ae5 FBH |
1039 | static int parse_line_num(char **ptr, int *val, const char *what) |
1040 | { | |
1041 | const char *start = *ptr; | |
1042 | ||
1043 | errno = 0; | |
1044 | *val = strtol(*ptr, ptr, 0); | |
1045 | if (errno || *ptr == start) { | |
1046 | semantic_error("'%s' is not a valid number.\n", what); | |
1047 | return -EINVAL; | |
1048 | } | |
1049 | return 0; | |
1050 | } | |
1051 | ||
573709fd MH |
1052 | /* Check the name is good for event, group or function */ |
1053 | static bool is_c_func_name(const char *name) | |
1054 | { | |
1055 | if (!isalpha(*name) && *name != '_') | |
1056 | return false; | |
1057 | while (*++name != '\0') { | |
1058 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1059 | return false; | |
1060 | } | |
1061 | return true; | |
1062 | } | |
1063 | ||
9d95b580 FBH |
1064 | /* |
1065 | * Stuff 'lr' according to the line range described by 'arg'. | |
1066 | * The line range syntax is described by: | |
1067 | * | |
1068 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 1069 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 1070 | */ |
146a1439 | 1071 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 1072 | { |
e116dfa1 | 1073 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
1074 | int err; |
1075 | ||
1076 | if (!name) | |
1077 | return -ENOMEM; | |
1078 | ||
1079 | lr->start = 0; | |
1080 | lr->end = INT_MAX; | |
1081 | ||
1082 | range = strchr(name, ':'); | |
1083 | if (range) { | |
1084 | *range++ = '\0'; | |
1085 | ||
1086 | err = parse_line_num(&range, &lr->start, "start line"); | |
1087 | if (err) | |
1088 | goto err; | |
1089 | ||
1090 | if (*range == '+' || *range == '-') { | |
1091 | const char c = *range++; | |
1092 | ||
1093 | err = parse_line_num(&range, &lr->end, "end line"); | |
1094 | if (err) | |
1095 | goto err; | |
1096 | ||
1097 | if (c == '+') { | |
1098 | lr->end += lr->start; | |
1099 | /* | |
1100 | * Adjust the number of lines here. | |
1101 | * If the number of lines == 1, the | |
1102 | * the end of line should be equal to | |
1103 | * the start of line. | |
1104 | */ | |
1105 | lr->end--; | |
1106 | } | |
1107 | } | |
9d95b580 | 1108 | |
d3b63d7a | 1109 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
1110 | |
1111 | err = -EINVAL; | |
d3b63d7a | 1112 | if (lr->start > lr->end) { |
631c9def | 1113 | semantic_error("Start line must be smaller" |
146a1439 | 1114 | " than end line.\n"); |
21dd9ae5 | 1115 | goto err; |
146a1439 | 1116 | } |
21dd9ae5 FBH |
1117 | if (*range != '\0') { |
1118 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
1119 | goto err; | |
146a1439 | 1120 | } |
d3b63d7a | 1121 | } |
02b95dad | 1122 | |
e116dfa1 MH |
1123 | file = strchr(name, '@'); |
1124 | if (file) { | |
1125 | *file = '\0'; | |
1126 | lr->file = strdup(++file); | |
1127 | if (lr->file == NULL) { | |
1128 | err = -ENOMEM; | |
1129 | goto err; | |
1130 | } | |
1131 | lr->function = name; | |
573709fd | 1132 | } else if (strchr(name, '/') || strchr(name, '.')) |
21dd9ae5 | 1133 | lr->file = name; |
573709fd | 1134 | else if (is_c_func_name(name))/* We reuse it for checking funcname */ |
21dd9ae5 | 1135 | lr->function = name; |
573709fd MH |
1136 | else { /* Invalid name */ |
1137 | semantic_error("'%s' is not a valid function name.\n", name); | |
1138 | err = -EINVAL; | |
1139 | goto err; | |
1140 | } | |
146a1439 MH |
1141 | |
1142 | return 0; | |
21dd9ae5 FBH |
1143 | err: |
1144 | free(name); | |
1145 | return err; | |
631c9def MH |
1146 | } |
1147 | ||
50656eec | 1148 | /* Parse probepoint definition. */ |
146a1439 | 1149 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 1150 | { |
4235b045 | 1151 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
1152 | char *ptr, *tmp; |
1153 | char c, nc = 0; | |
3099c026 | 1154 | bool file_spec = false; |
50656eec MH |
1155 | /* |
1156 | * <Syntax> | |
2a9c8c36 MH |
1157 | * perf probe [EVENT=]SRC[:LN|;PTN] |
1158 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
1159 | * |
1160 | * TODO:Group name support | |
50656eec | 1161 | */ |
e59d29e8 WN |
1162 | if (!arg) |
1163 | return -EINVAL; | |
50656eec | 1164 | |
2a9c8c36 MH |
1165 | ptr = strpbrk(arg, ";=@+%"); |
1166 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
1167 | *ptr = '\0'; |
1168 | tmp = ptr + 1; | |
146a1439 MH |
1169 | if (strchr(arg, ':')) { |
1170 | semantic_error("Group name is not supported yet.\n"); | |
1171 | return -ENOTSUP; | |
1172 | } | |
573709fd | 1173 | if (!is_c_func_name(arg)) { |
b7702a21 | 1174 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
1175 | "follow C symbol-naming rule.\n", arg); |
1176 | return -EINVAL; | |
1177 | } | |
02b95dad MH |
1178 | pev->event = strdup(arg); |
1179 | if (pev->event == NULL) | |
1180 | return -ENOMEM; | |
4235b045 | 1181 | pev->group = NULL; |
af663d75 MH |
1182 | arg = tmp; |
1183 | } | |
1184 | ||
3099c026 NR |
1185 | /* |
1186 | * Check arg is function or file name and copy it. | |
1187 | * | |
1188 | * We consider arg to be a file spec if and only if it satisfies | |
1189 | * all of the below criteria:: | |
1190 | * - it does not include any of "+@%", | |
1191 | * - it includes one of ":;", and | |
1192 | * - it has a period '.' in the name. | |
1193 | * | |
1194 | * Otherwise, we consider arg to be a function specification. | |
1195 | */ | |
1196 | if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) { | |
1197 | /* This is a file spec if it includes a '.' before ; or : */ | |
1198 | if (memchr(arg, '.', ptr - arg)) | |
1199 | file_spec = true; | |
1200 | } | |
1201 | ||
2a9c8c36 | 1202 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
1203 | if (ptr) { |
1204 | nc = *ptr; | |
1205 | *ptr++ = '\0'; | |
1206 | } | |
1207 | ||
6c6e024f WN |
1208 | if (arg[0] == '\0') |
1209 | tmp = NULL; | |
1210 | else { | |
1211 | tmp = strdup(arg); | |
1212 | if (tmp == NULL) | |
1213 | return -ENOMEM; | |
1214 | } | |
02b95dad | 1215 | |
3099c026 | 1216 | if (file_spec) |
02b95dad | 1217 | pp->file = tmp; |
da15bd9d | 1218 | else { |
02b95dad | 1219 | pp->function = tmp; |
50656eec | 1220 | |
da15bd9d WN |
1221 | /* |
1222 | * Keep pp->function even if this is absolute address, | |
1223 | * so it can mark whether abs_address is valid. | |
1224 | * Which make 'perf probe lib.bin 0x0' possible. | |
1225 | * | |
1226 | * Note that checking length of tmp is not needed | |
1227 | * because when we access tmp[1] we know tmp[0] is '0', | |
1228 | * so tmp[1] should always valid (but could be '\0'). | |
1229 | */ | |
1230 | if (tmp && !strncmp(tmp, "0x", 2)) { | |
1231 | pp->abs_address = strtoul(pp->function, &tmp, 0); | |
1232 | if (*tmp != '\0') { | |
1233 | semantic_error("Invalid absolute address.\n"); | |
1234 | return -EINVAL; | |
1235 | } | |
1236 | } | |
1237 | } | |
1238 | ||
50656eec MH |
1239 | /* Parse other options */ |
1240 | while (ptr) { | |
1241 | arg = ptr; | |
1242 | c = nc; | |
2a9c8c36 | 1243 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
1244 | pp->lazy_line = strdup(arg); |
1245 | if (pp->lazy_line == NULL) | |
1246 | return -ENOMEM; | |
2a9c8c36 MH |
1247 | break; |
1248 | } | |
1249 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
1250 | if (ptr) { |
1251 | nc = *ptr; | |
1252 | *ptr++ = '\0'; | |
1253 | } | |
1254 | switch (c) { | |
1255 | case ':': /* Line number */ | |
1256 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 1257 | if (*tmp != '\0') { |
2a9c8c36 | 1258 | semantic_error("There is non-digit char" |
146a1439 MH |
1259 | " in line number.\n"); |
1260 | return -EINVAL; | |
1261 | } | |
50656eec MH |
1262 | break; |
1263 | case '+': /* Byte offset from a symbol */ | |
1264 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 1265 | if (*tmp != '\0') { |
2a9c8c36 | 1266 | semantic_error("There is non-digit character" |
146a1439 MH |
1267 | " in offset.\n"); |
1268 | return -EINVAL; | |
1269 | } | |
50656eec MH |
1270 | break; |
1271 | case '@': /* File name */ | |
146a1439 MH |
1272 | if (pp->file) { |
1273 | semantic_error("SRC@SRC is not allowed.\n"); | |
1274 | return -EINVAL; | |
1275 | } | |
02b95dad MH |
1276 | pp->file = strdup(arg); |
1277 | if (pp->file == NULL) | |
1278 | return -ENOMEM; | |
50656eec MH |
1279 | break; |
1280 | case '%': /* Probe places */ | |
1281 | if (strcmp(arg, "return") == 0) { | |
1282 | pp->retprobe = 1; | |
146a1439 MH |
1283 | } else { /* Others not supported yet */ |
1284 | semantic_error("%%%s is not supported.\n", arg); | |
1285 | return -ENOTSUP; | |
1286 | } | |
50656eec | 1287 | break; |
146a1439 MH |
1288 | default: /* Buggy case */ |
1289 | pr_err("This program has a bug at %s:%d.\n", | |
1290 | __FILE__, __LINE__); | |
1291 | return -ENOTSUP; | |
50656eec MH |
1292 | break; |
1293 | } | |
1294 | } | |
1295 | ||
1296 | /* Exclusion check */ | |
146a1439 | 1297 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
1298 | semantic_error("Lazy pattern can't be used with" |
1299 | " line number.\n"); | |
146a1439 MH |
1300 | return -EINVAL; |
1301 | } | |
2a9c8c36 | 1302 | |
146a1439 | 1303 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 1304 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
1305 | return -EINVAL; |
1306 | } | |
2a9c8c36 | 1307 | |
146a1439 | 1308 | if (pp->line && pp->offset) { |
0e43e5d2 | 1309 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
1310 | return -EINVAL; |
1311 | } | |
50656eec | 1312 | |
146a1439 | 1313 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 1314 | semantic_error("File always requires line number or " |
0e43e5d2 | 1315 | "lazy pattern.\n"); |
146a1439 MH |
1316 | return -EINVAL; |
1317 | } | |
50656eec | 1318 | |
146a1439 | 1319 | if (pp->offset && !pp->function) { |
0e43e5d2 | 1320 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
1321 | return -EINVAL; |
1322 | } | |
50656eec | 1323 | |
146a1439 | 1324 | if (pp->retprobe && !pp->function) { |
0e43e5d2 | 1325 | semantic_error("Return probe requires an entry function.\n"); |
146a1439 MH |
1326 | return -EINVAL; |
1327 | } | |
50656eec | 1328 | |
146a1439 | 1329 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 1330 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 1331 | "return probe.\n"); |
146a1439 MH |
1332 | return -EINVAL; |
1333 | } | |
50656eec | 1334 | |
4235b045 | 1335 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
1336 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
1337 | pp->lazy_line); | |
146a1439 | 1338 | return 0; |
50656eec MH |
1339 | } |
1340 | ||
7df2f329 | 1341 | /* Parse perf-probe event argument */ |
146a1439 | 1342 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 1343 | { |
b2a3c12b | 1344 | char *tmp, *goodname; |
7df2f329 MH |
1345 | struct perf_probe_arg_field **fieldp; |
1346 | ||
1347 | pr_debug("parsing arg: %s into ", str); | |
1348 | ||
48481938 MH |
1349 | tmp = strchr(str, '='); |
1350 | if (tmp) { | |
02b95dad MH |
1351 | arg->name = strndup(str, tmp - str); |
1352 | if (arg->name == NULL) | |
1353 | return -ENOMEM; | |
11a1ca35 | 1354 | pr_debug("name:%s ", arg->name); |
48481938 MH |
1355 | str = tmp + 1; |
1356 | } | |
1357 | ||
11a1ca35 MH |
1358 | tmp = strchr(str, ':'); |
1359 | if (tmp) { /* Type setting */ | |
1360 | *tmp = '\0'; | |
02b95dad MH |
1361 | arg->type = strdup(tmp + 1); |
1362 | if (arg->type == NULL) | |
1363 | return -ENOMEM; | |
11a1ca35 MH |
1364 | pr_debug("type:%s ", arg->type); |
1365 | } | |
1366 | ||
b2a3c12b | 1367 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
1368 | if (!is_c_varname(str) || !tmp) { |
1369 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
1370 | arg->var = strdup(str); |
1371 | if (arg->var == NULL) | |
1372 | return -ENOMEM; | |
48481938 | 1373 | pr_debug("%s\n", arg->var); |
146a1439 | 1374 | return 0; |
7df2f329 MH |
1375 | } |
1376 | ||
b2a3c12b | 1377 | /* Structure fields or array element */ |
02b95dad MH |
1378 | arg->var = strndup(str, tmp - str); |
1379 | if (arg->var == NULL) | |
1380 | return -ENOMEM; | |
b2a3c12b | 1381 | goodname = arg->var; |
48481938 | 1382 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
1383 | fieldp = &arg->field; |
1384 | ||
1385 | do { | |
e334016f MH |
1386 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
1387 | if (*fieldp == NULL) | |
1388 | return -ENOMEM; | |
b2a3c12b MH |
1389 | if (*tmp == '[') { /* Array */ |
1390 | str = tmp; | |
1391 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 1392 | (*fieldp)->ref = true; |
b2a3c12b MH |
1393 | if (*tmp != ']' || tmp == str + 1) { |
1394 | semantic_error("Array index must be a" | |
1395 | " number.\n"); | |
1396 | return -EINVAL; | |
1397 | } | |
1398 | tmp++; | |
1399 | if (*tmp == '\0') | |
1400 | tmp = NULL; | |
1401 | } else { /* Structure */ | |
1402 | if (*tmp == '.') { | |
1403 | str = tmp + 1; | |
1404 | (*fieldp)->ref = false; | |
1405 | } else if (tmp[1] == '>') { | |
1406 | str = tmp + 2; | |
1407 | (*fieldp)->ref = true; | |
1408 | } else { | |
1409 | semantic_error("Argument parse error: %s\n", | |
1410 | str); | |
1411 | return -EINVAL; | |
1412 | } | |
1413 | tmp = strpbrk(str, "-.["); | |
146a1439 | 1414 | } |
7df2f329 | 1415 | if (tmp) { |
02b95dad MH |
1416 | (*fieldp)->name = strndup(str, tmp - str); |
1417 | if ((*fieldp)->name == NULL) | |
1418 | return -ENOMEM; | |
b2a3c12b MH |
1419 | if (*str != '[') |
1420 | goodname = (*fieldp)->name; | |
7df2f329 MH |
1421 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
1422 | fieldp = &(*fieldp)->next; | |
1423 | } | |
1424 | } while (tmp); | |
02b95dad MH |
1425 | (*fieldp)->name = strdup(str); |
1426 | if ((*fieldp)->name == NULL) | |
1427 | return -ENOMEM; | |
b2a3c12b MH |
1428 | if (*str != '[') |
1429 | goodname = (*fieldp)->name; | |
7df2f329 | 1430 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 1431 | |
b2a3c12b | 1432 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 1433 | if (!arg->name) { |
b2a3c12b | 1434 | arg->name = strdup(goodname); |
02b95dad MH |
1435 | if (arg->name == NULL) |
1436 | return -ENOMEM; | |
1437 | } | |
146a1439 | 1438 | return 0; |
7df2f329 MH |
1439 | } |
1440 | ||
4235b045 | 1441 | /* Parse perf-probe event command */ |
146a1439 | 1442 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 1443 | { |
e1c01d61 | 1444 | char **argv; |
146a1439 | 1445 | int argc, i, ret = 0; |
fac13fd5 | 1446 | |
4235b045 | 1447 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1448 | if (!argv) { |
1449 | pr_debug("Failed to split arguments.\n"); | |
1450 | return -ENOMEM; | |
1451 | } | |
1452 | if (argc - 1 > MAX_PROBE_ARGS) { | |
1453 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
1454 | ret = -ERANGE; | |
1455 | goto out; | |
1456 | } | |
50656eec | 1457 | /* Parse probe point */ |
146a1439 MH |
1458 | ret = parse_perf_probe_point(argv[0], pev); |
1459 | if (ret < 0) | |
1460 | goto out; | |
50656eec | 1461 | |
e1c01d61 | 1462 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 1463 | pev->nargs = argc - 1; |
e334016f MH |
1464 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1465 | if (pev->args == NULL) { | |
1466 | ret = -ENOMEM; | |
1467 | goto out; | |
1468 | } | |
146a1439 MH |
1469 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
1470 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
1471 | if (ret >= 0 && | |
1472 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 1473 | semantic_error("You can't specify local variable for" |
146a1439 MH |
1474 | " kretprobe.\n"); |
1475 | ret = -EINVAL; | |
1476 | } | |
e1c01d61 | 1477 | } |
146a1439 | 1478 | out: |
e1c01d61 | 1479 | argv_free(argv); |
146a1439 MH |
1480 | |
1481 | return ret; | |
50656eec MH |
1482 | } |
1483 | ||
4235b045 MH |
1484 | /* Return true if this perf_probe_event requires debuginfo */ |
1485 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
1486 | { | |
1487 | int i; | |
1488 | ||
1489 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
1490 | return true; | |
1491 | ||
1492 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 1493 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
1494 | return true; |
1495 | ||
1496 | return false; | |
1497 | } | |
1498 | ||
0e60836b | 1499 | /* Parse probe_events event into struct probe_point */ |
92f6c72e | 1500 | int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) |
4de189fe | 1501 | { |
0e60836b | 1502 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
1503 | char pr; |
1504 | char *p; | |
bcbd0040 | 1505 | char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; |
4de189fe MH |
1506 | int ret, i, argc; |
1507 | char **argv; | |
1508 | ||
0e60836b | 1509 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1510 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1511 | if (!argv) { |
1512 | pr_debug("Failed to split arguments.\n"); | |
1513 | return -ENOMEM; | |
1514 | } | |
1515 | if (argc < 2) { | |
1516 | semantic_error("Too few probe arguments.\n"); | |
1517 | ret = -ERANGE; | |
1518 | goto out; | |
1519 | } | |
4de189fe MH |
1520 | |
1521 | /* Scan event and group name. */ | |
bcbd0040 IT |
1522 | argv0_str = strdup(argv[0]); |
1523 | if (argv0_str == NULL) { | |
1524 | ret = -ENOMEM; | |
1525 | goto out; | |
1526 | } | |
1527 | fmt1_str = strtok_r(argv0_str, ":", &fmt); | |
1528 | fmt2_str = strtok_r(NULL, "/", &fmt); | |
1529 | fmt3_str = strtok_r(NULL, " \t", &fmt); | |
1530 | if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL | |
1531 | || fmt3_str == NULL) { | |
146a1439 MH |
1532 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1533 | ret = -EINVAL; | |
1534 | goto out; | |
1535 | } | |
bcbd0040 IT |
1536 | pr = fmt1_str[0]; |
1537 | tev->group = strdup(fmt2_str); | |
1538 | tev->event = strdup(fmt3_str); | |
1539 | if (tev->group == NULL || tev->event == NULL) { | |
1540 | ret = -ENOMEM; | |
1541 | goto out; | |
1542 | } | |
4235b045 | 1543 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1544 | |
4235b045 | 1545 | tp->retprobe = (pr == 'r'); |
4de189fe | 1546 | |
190b57fc MH |
1547 | /* Scan module name(if there), function name and offset */ |
1548 | p = strchr(argv[1], ':'); | |
1549 | if (p) { | |
1550 | tp->module = strndup(argv[1], p - argv[1]); | |
1551 | p++; | |
1552 | } else | |
1553 | p = argv[1]; | |
bcbd0040 | 1554 | fmt1_str = strtok_r(p, "+", &fmt); |
be07afe9 WN |
1555 | /* only the address started with 0x */ |
1556 | if (fmt1_str[0] == '0') { | |
1557 | /* | |
1558 | * Fix a special case: | |
1559 | * if address == 0, kernel reports something like: | |
1560 | * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax | |
1561 | * Newer kernel may fix that, but we want to | |
1562 | * support old kernel also. | |
1563 | */ | |
1564 | if (strcmp(fmt1_str, "0x") == 0) { | |
1565 | if (!argv[2] || strcmp(argv[2], "(null)")) { | |
1566 | ret = -EINVAL; | |
1567 | goto out; | |
1568 | } | |
1569 | tp->address = 0; | |
1570 | ||
1571 | free(argv[2]); | |
1572 | for (i = 2; argv[i + 1] != NULL; i++) | |
1573 | argv[i] = argv[i + 1]; | |
1574 | ||
1575 | argv[i] = NULL; | |
1576 | argc -= 1; | |
1577 | } else | |
1578 | tp->address = strtoul(fmt1_str, NULL, 0); | |
1579 | } else { | |
5a6f6314 MH |
1580 | /* Only the symbol-based probe has offset */ |
1581 | tp->symbol = strdup(fmt1_str); | |
1582 | if (tp->symbol == NULL) { | |
1583 | ret = -ENOMEM; | |
1584 | goto out; | |
1585 | } | |
1586 | fmt2_str = strtok_r(NULL, "", &fmt); | |
1587 | if (fmt2_str == NULL) | |
1588 | tp->offset = 0; | |
1589 | else | |
1590 | tp->offset = strtoul(fmt2_str, NULL, 10); | |
bcbd0040 | 1591 | } |
4de189fe | 1592 | |
4235b045 | 1593 | tev->nargs = argc - 2; |
0e60836b | 1594 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1595 | if (tev->args == NULL) { |
1596 | ret = -ENOMEM; | |
1597 | goto out; | |
1598 | } | |
4235b045 | 1599 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1600 | p = strchr(argv[i + 2], '='); |
1601 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1602 | *p++ = '\0'; |
1603 | else | |
1604 | p = argv[i + 2]; | |
02b95dad | 1605 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1606 | /* TODO: parse regs and offset */ |
02b95dad MH |
1607 | tev->args[i].value = strdup(p); |
1608 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1609 | ret = -ENOMEM; | |
1610 | goto out; | |
1611 | } | |
4de189fe | 1612 | } |
146a1439 MH |
1613 | ret = 0; |
1614 | out: | |
bcbd0040 | 1615 | free(argv0_str); |
4de189fe | 1616 | argv_free(argv); |
146a1439 | 1617 | return ret; |
4de189fe MH |
1618 | } |
1619 | ||
7df2f329 MH |
1620 | /* Compose only probe arg */ |
1621 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
1622 | { | |
1623 | struct perf_probe_arg_field *field = pa->field; | |
1624 | int ret; | |
1625 | char *tmp = buf; | |
1626 | ||
48481938 MH |
1627 | if (pa->name && pa->var) |
1628 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
1629 | else | |
1630 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
1631 | if (ret <= 0) |
1632 | goto error; | |
1633 | tmp += ret; | |
1634 | len -= ret; | |
1635 | ||
1636 | while (field) { | |
b2a3c12b MH |
1637 | if (field->name[0] == '[') |
1638 | ret = e_snprintf(tmp, len, "%s", field->name); | |
1639 | else | |
1640 | ret = e_snprintf(tmp, len, "%s%s", | |
1641 | field->ref ? "->" : ".", field->name); | |
7df2f329 MH |
1642 | if (ret <= 0) |
1643 | goto error; | |
1644 | tmp += ret; | |
1645 | len -= ret; | |
1646 | field = field->next; | |
1647 | } | |
11a1ca35 MH |
1648 | |
1649 | if (pa->type) { | |
1650 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
1651 | if (ret <= 0) | |
1652 | goto error; | |
1653 | tmp += ret; | |
1654 | len -= ret; | |
1655 | } | |
1656 | ||
7df2f329 MH |
1657 | return tmp - buf; |
1658 | error: | |
5f03cba4 | 1659 | pr_debug("Failed to synthesize perf probe argument: %d\n", ret); |
146a1439 | 1660 | return ret; |
7df2f329 MH |
1661 | } |
1662 | ||
4235b045 MH |
1663 | /* Compose only probe point (not argument) */ |
1664 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 1665 | { |
fb1587d8 MH |
1666 | char *buf, *tmp; |
1667 | char offs[32] = "", line[32] = "", file[32] = ""; | |
1668 | int ret, len; | |
4de189fe | 1669 | |
e334016f MH |
1670 | buf = zalloc(MAX_CMDLEN); |
1671 | if (buf == NULL) { | |
1672 | ret = -ENOMEM; | |
1673 | goto error; | |
1674 | } | |
4de189fe | 1675 | if (pp->offset) { |
fb1587d8 | 1676 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
1677 | if (ret <= 0) |
1678 | goto error; | |
1679 | } | |
1680 | if (pp->line) { | |
fb1587d8 MH |
1681 | ret = e_snprintf(line, 32, ":%d", pp->line); |
1682 | if (ret <= 0) | |
1683 | goto error; | |
1684 | } | |
1685 | if (pp->file) { | |
32ae2ade FBH |
1686 | tmp = pp->file; |
1687 | len = strlen(tmp); | |
1688 | if (len > 30) { | |
1689 | tmp = strchr(pp->file + len - 30, '/'); | |
1690 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1691 | } | |
1692 | ret = e_snprintf(file, 32, "@%s", tmp); | |
4de189fe MH |
1693 | if (ret <= 0) |
1694 | goto error; | |
1695 | } | |
1696 | ||
1697 | if (pp->function) | |
fb1587d8 MH |
1698 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
1699 | offs, pp->retprobe ? "%return" : "", line, | |
1700 | file); | |
4de189fe | 1701 | else |
fb1587d8 | 1702 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
1703 | if (ret <= 0) |
1704 | goto error; | |
1705 | ||
1706 | return buf; | |
7ef17aaf | 1707 | error: |
5f03cba4 | 1708 | pr_debug("Failed to synthesize perf probe point: %d\n", ret); |
f5385650 | 1709 | free(buf); |
146a1439 | 1710 | return NULL; |
7ef17aaf MH |
1711 | } |
1712 | ||
4235b045 MH |
1713 | #if 0 |
1714 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
1715 | { |
1716 | char *buf; | |
1717 | int i, len, ret; | |
1718 | ||
4235b045 MH |
1719 | buf = synthesize_perf_probe_point(&pev->point); |
1720 | if (!buf) | |
1721 | return NULL; | |
4de189fe | 1722 | |
4235b045 MH |
1723 | len = strlen(buf); |
1724 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 1725 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
1726 | pev->args[i].name); |
1727 | if (ret <= 0) { | |
1728 | free(buf); | |
1729 | return NULL; | |
1730 | } | |
4de189fe MH |
1731 | len += ret; |
1732 | } | |
4de189fe | 1733 | |
4235b045 MH |
1734 | return buf; |
1735 | } | |
1736 | #endif | |
1737 | ||
0e60836b | 1738 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
4235b045 MH |
1739 | char **buf, size_t *buflen, |
1740 | int depth) | |
1741 | { | |
1742 | int ret; | |
1743 | if (ref->next) { | |
0e60836b | 1744 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
4235b045 MH |
1745 | buflen, depth + 1); |
1746 | if (depth < 0) | |
1747 | goto out; | |
1748 | } | |
1749 | ||
1750 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
1751 | if (ret < 0) | |
1752 | depth = ret; | |
1753 | else { | |
1754 | *buf += ret; | |
1755 | *buflen -= ret; | |
1756 | } | |
1757 | out: | |
1758 | return depth; | |
4de189fe | 1759 | |
4de189fe MH |
1760 | } |
1761 | ||
0e60836b | 1762 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
4235b045 | 1763 | char *buf, size_t buflen) |
50656eec | 1764 | { |
0e60836b | 1765 | struct probe_trace_arg_ref *ref = arg->ref; |
4235b045 MH |
1766 | int ret, depth = 0; |
1767 | char *tmp = buf; | |
1768 | ||
1769 | /* Argument name or separator */ | |
1770 | if (arg->name) | |
1771 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
1772 | else | |
1773 | ret = e_snprintf(buf, buflen, " "); | |
1774 | if (ret < 0) | |
1775 | return ret; | |
1776 | buf += ret; | |
1777 | buflen -= ret; | |
1778 | ||
b7dcb857 MH |
1779 | /* Special case: @XXX */ |
1780 | if (arg->value[0] == '@' && arg->ref) | |
1781 | ref = ref->next; | |
1782 | ||
4235b045 | 1783 | /* Dereferencing arguments */ |
b7dcb857 | 1784 | if (ref) { |
0e60836b | 1785 | depth = __synthesize_probe_trace_arg_ref(ref, &buf, |
4235b045 MH |
1786 | &buflen, 1); |
1787 | if (depth < 0) | |
1788 | return depth; | |
1789 | } | |
1790 | ||
1791 | /* Print argument value */ | |
b7dcb857 MH |
1792 | if (arg->value[0] == '@' && arg->ref) |
1793 | ret = e_snprintf(buf, buflen, "%s%+ld", arg->value, | |
1794 | arg->ref->offset); | |
1795 | else | |
1796 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
4235b045 MH |
1797 | if (ret < 0) |
1798 | return ret; | |
1799 | buf += ret; | |
1800 | buflen -= ret; | |
1801 | ||
1802 | /* Closing */ | |
1803 | while (depth--) { | |
1804 | ret = e_snprintf(buf, buflen, ")"); | |
1805 | if (ret < 0) | |
1806 | return ret; | |
1807 | buf += ret; | |
1808 | buflen -= ret; | |
1809 | } | |
4984912e MH |
1810 | /* Print argument type */ |
1811 | if (arg->type) { | |
1812 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
1813 | if (ret <= 0) | |
1814 | return ret; | |
1815 | buf += ret; | |
1816 | } | |
4235b045 MH |
1817 | |
1818 | return buf - tmp; | |
1819 | } | |
1820 | ||
0e60836b | 1821 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1822 | { |
0e60836b | 1823 | struct probe_trace_point *tp = &tev->point; |
50656eec MH |
1824 | char *buf; |
1825 | int i, len, ret; | |
1826 | ||
e334016f MH |
1827 | buf = zalloc(MAX_CMDLEN); |
1828 | if (buf == NULL) | |
1829 | return NULL; | |
1830 | ||
eb948e50 MH |
1831 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', |
1832 | tev->group, tev->event); | |
1833 | if (len <= 0) | |
1834 | goto error; | |
1835 | ||
da15bd9d WN |
1836 | /* Uprobes must have tp->module */ |
1837 | if (tev->uprobes && !tp->module) | |
eb948e50 | 1838 | goto error; |
da15bd9d WN |
1839 | /* |
1840 | * If tp->address == 0, then this point must be a | |
1841 | * absolute address uprobe. | |
1842 | * try_to_find_absolute_address() should have made | |
1843 | * tp->symbol to "0x0". | |
1844 | */ | |
1845 | if (tev->uprobes && !tp->address) { | |
1846 | if (!tp->symbol || strcmp(tp->symbol, "0x0")) | |
1847 | goto error; | |
1848 | } | |
eb948e50 MH |
1849 | |
1850 | /* Use the tp->address for uprobes */ | |
225466f1 | 1851 | if (tev->uprobes) |
eb948e50 MH |
1852 | ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s:0x%lx", |
1853 | tp->module, tp->address); | |
da15bd9d WN |
1854 | else if (!strncmp(tp->symbol, "0x", 2)) |
1855 | /* Absolute address. See try_to_find_absolute_address() */ | |
1856 | ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s0x%lx", | |
1857 | tp->module ?: "", tp->module ? ":" : "", | |
1858 | tp->address); | |
225466f1 | 1859 | else |
eb948e50 | 1860 | ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s%s+%lu", |
225466f1 SD |
1861 | tp->module ?: "", tp->module ? ":" : "", |
1862 | tp->symbol, tp->offset); | |
1863 | ||
eb948e50 | 1864 | if (ret <= 0) |
50656eec | 1865 | goto error; |
eb948e50 | 1866 | len += ret; |
50656eec | 1867 | |
4235b045 | 1868 | for (i = 0; i < tev->nargs; i++) { |
0e60836b | 1869 | ret = synthesize_probe_trace_arg(&tev->args[i], buf + len, |
4235b045 | 1870 | MAX_CMDLEN - len); |
4de189fe | 1871 | if (ret <= 0) |
50656eec MH |
1872 | goto error; |
1873 | len += ret; | |
1874 | } | |
50656eec | 1875 | |
4235b045 | 1876 | return buf; |
50656eec | 1877 | error: |
4235b045 MH |
1878 | free(buf); |
1879 | return NULL; | |
1880 | } | |
50656eec | 1881 | |
5a6f6314 MH |
1882 | static int find_perf_probe_point_from_map(struct probe_trace_point *tp, |
1883 | struct perf_probe_point *pp, | |
1884 | bool is_kprobe) | |
1885 | { | |
1886 | struct symbol *sym = NULL; | |
1887 | struct map *map; | |
e486367f | 1888 | u64 addr = tp->address; |
5a6f6314 MH |
1889 | int ret = -ENOENT; |
1890 | ||
1891 | if (!is_kprobe) { | |
1892 | map = dso__new_map(tp->module); | |
1893 | if (!map) | |
1894 | goto out; | |
5a6f6314 MH |
1895 | sym = map__find_symbol(map, addr, NULL); |
1896 | } else { | |
9b239a12 | 1897 | if (tp->symbol && !addr) { |
0a62f686 MH |
1898 | if (kernel_get_symbol_address_by_name(tp->symbol, |
1899 | &addr, true, false) < 0) | |
9b239a12 MH |
1900 | goto out; |
1901 | } | |
5a6f6314 MH |
1902 | if (addr) { |
1903 | addr += tp->offset; | |
1904 | sym = __find_kernel_function(addr, &map); | |
1905 | } | |
1906 | } | |
98d3b258 | 1907 | |
5a6f6314 MH |
1908 | if (!sym) |
1909 | goto out; | |
1910 | ||
1911 | pp->retprobe = tp->retprobe; | |
1912 | pp->offset = addr - map->unmap_ip(map, sym->start); | |
1913 | pp->function = strdup(sym->name); | |
1914 | ret = pp->function ? 0 : -ENOMEM; | |
1915 | ||
1916 | out: | |
1917 | if (map && !is_kprobe) { | |
84c2cafa | 1918 | map__put(map); |
5a6f6314 MH |
1919 | } |
1920 | ||
1921 | return ret; | |
1922 | } | |
1923 | ||
1924 | static int convert_to_perf_probe_point(struct probe_trace_point *tp, | |
da15bd9d WN |
1925 | struct perf_probe_point *pp, |
1926 | bool is_kprobe) | |
5a6f6314 MH |
1927 | { |
1928 | char buf[128]; | |
1929 | int ret; | |
1930 | ||
1931 | ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); | |
1932 | if (!ret) | |
1933 | return 0; | |
1934 | ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); | |
1935 | if (!ret) | |
1936 | return 0; | |
1937 | ||
1938 | pr_debug("Failed to find probe point from both of dwarf and map.\n"); | |
1939 | ||
1940 | if (tp->symbol) { | |
1941 | pp->function = strdup(tp->symbol); | |
1942 | pp->offset = tp->offset; | |
614e2fdb | 1943 | } else { |
5a6f6314 MH |
1944 | ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); |
1945 | if (ret < 0) | |
1946 | return ret; | |
1947 | pp->function = strdup(buf); | |
1948 | pp->offset = 0; | |
1949 | } | |
1950 | if (pp->function == NULL) | |
1951 | return -ENOMEM; | |
1952 | ||
1953 | pp->retprobe = tp->retprobe; | |
1954 | ||
1955 | return 0; | |
1956 | } | |
1957 | ||
0e60836b | 1958 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
225466f1 | 1959 | struct perf_probe_event *pev, bool is_kprobe) |
4235b045 | 1960 | { |
02b95dad | 1961 | char buf[64] = ""; |
146a1439 | 1962 | int i, ret; |
4235b045 | 1963 | |
4b4da7f7 | 1964 | /* Convert event/group name */ |
02b95dad MH |
1965 | pev->event = strdup(tev->event); |
1966 | pev->group = strdup(tev->group); | |
1967 | if (pev->event == NULL || pev->group == NULL) | |
1968 | return -ENOMEM; | |
fb1587d8 | 1969 | |
4b4da7f7 | 1970 | /* Convert trace_point to probe_point */ |
5a6f6314 | 1971 | ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); |
146a1439 MH |
1972 | if (ret < 0) |
1973 | return ret; | |
4b4da7f7 | 1974 | |
4235b045 MH |
1975 | /* Convert trace_arg to probe_arg */ |
1976 | pev->nargs = tev->nargs; | |
e334016f MH |
1977 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1978 | if (pev->args == NULL) | |
1979 | return -ENOMEM; | |
02b95dad | 1980 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1981 | if (tev->args[i].name) |
02b95dad | 1982 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1983 | else { |
0e60836b | 1984 | ret = synthesize_probe_trace_arg(&tev->args[i], |
146a1439 | 1985 | buf, 64); |
02b95dad | 1986 | pev->args[i].name = strdup(buf); |
4235b045 | 1987 | } |
02b95dad MH |
1988 | if (pev->args[i].name == NULL && ret >= 0) |
1989 | ret = -ENOMEM; | |
1990 | } | |
146a1439 MH |
1991 | |
1992 | if (ret < 0) | |
1993 | clear_perf_probe_event(pev); | |
1994 | ||
1995 | return ret; | |
4235b045 MH |
1996 | } |
1997 | ||
1998 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
1999 | { | |
7df2f329 | 2000 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
2001 | int i; |
2002 | ||
f5385650 ACM |
2003 | free(pev->event); |
2004 | free(pev->group); | |
7afb3fab | 2005 | free(pev->target); |
9b118aca | 2006 | clear_perf_probe_point(&pev->point); |
f5385650 | 2007 | |
7df2f329 | 2008 | for (i = 0; i < pev->nargs; i++) { |
f5385650 ACM |
2009 | free(pev->args[i].name); |
2010 | free(pev->args[i].var); | |
2011 | free(pev->args[i].type); | |
7df2f329 MH |
2012 | field = pev->args[i].field; |
2013 | while (field) { | |
2014 | next = field->next; | |
74cf249d | 2015 | zfree(&field->name); |
7df2f329 MH |
2016 | free(field); |
2017 | field = next; | |
2018 | } | |
2019 | } | |
f5385650 | 2020 | free(pev->args); |
4235b045 MH |
2021 | memset(pev, 0, sizeof(*pev)); |
2022 | } | |
2023 | ||
92f6c72e | 2024 | void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 2025 | { |
0e60836b | 2026 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
2027 | int i; |
2028 | ||
f5385650 ACM |
2029 | free(tev->event); |
2030 | free(tev->group); | |
2031 | free(tev->point.symbol); | |
4c859351 | 2032 | free(tev->point.realname); |
f5385650 | 2033 | free(tev->point.module); |
4235b045 | 2034 | for (i = 0; i < tev->nargs; i++) { |
f5385650 ACM |
2035 | free(tev->args[i].name); |
2036 | free(tev->args[i].value); | |
2037 | free(tev->args[i].type); | |
4235b045 MH |
2038 | ref = tev->args[i].ref; |
2039 | while (ref) { | |
2040 | next = ref->next; | |
2041 | free(ref); | |
2042 | ref = next; | |
2043 | } | |
2044 | } | |
f5385650 | 2045 | free(tev->args); |
4235b045 | 2046 | memset(tev, 0, sizeof(*tev)); |
50656eec MH |
2047 | } |
2048 | ||
9aaf5a5f MH |
2049 | struct kprobe_blacklist_node { |
2050 | struct list_head list; | |
2051 | unsigned long start; | |
2052 | unsigned long end; | |
2053 | char *symbol; | |
2054 | }; | |
2055 | ||
2056 | static void kprobe_blacklist__delete(struct list_head *blacklist) | |
2057 | { | |
2058 | struct kprobe_blacklist_node *node; | |
2059 | ||
2060 | while (!list_empty(blacklist)) { | |
2061 | node = list_first_entry(blacklist, | |
2062 | struct kprobe_blacklist_node, list); | |
2063 | list_del(&node->list); | |
2064 | free(node->symbol); | |
2065 | free(node); | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | static int kprobe_blacklist__load(struct list_head *blacklist) | |
2070 | { | |
2071 | struct kprobe_blacklist_node *node; | |
4605eab3 | 2072 | const char *__debugfs = debugfs__mountpoint(); |
9aaf5a5f MH |
2073 | char buf[PATH_MAX], *p; |
2074 | FILE *fp; | |
2075 | int ret; | |
2076 | ||
2077 | if (__debugfs == NULL) | |
2078 | return -ENOTSUP; | |
2079 | ||
2080 | ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); | |
2081 | if (ret < 0) | |
2082 | return ret; | |
2083 | ||
2084 | fp = fopen(buf, "r"); | |
2085 | if (!fp) | |
2086 | return -errno; | |
2087 | ||
2088 | ret = 0; | |
2089 | while (fgets(buf, PATH_MAX, fp)) { | |
2090 | node = zalloc(sizeof(*node)); | |
2091 | if (!node) { | |
2092 | ret = -ENOMEM; | |
2093 | break; | |
2094 | } | |
2095 | INIT_LIST_HEAD(&node->list); | |
2096 | list_add_tail(&node->list, blacklist); | |
2097 | if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { | |
2098 | ret = -EINVAL; | |
2099 | break; | |
2100 | } | |
2101 | p = strchr(buf, '\t'); | |
2102 | if (p) { | |
2103 | p++; | |
2104 | if (p[strlen(p) - 1] == '\n') | |
2105 | p[strlen(p) - 1] = '\0'; | |
2106 | } else | |
2107 | p = (char *)"unknown"; | |
2108 | node->symbol = strdup(p); | |
2109 | if (!node->symbol) { | |
2110 | ret = -ENOMEM; | |
2111 | break; | |
2112 | } | |
2113 | pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", | |
2114 | node->start, node->end, node->symbol); | |
2115 | ret++; | |
2116 | } | |
2117 | if (ret < 0) | |
2118 | kprobe_blacklist__delete(blacklist); | |
2119 | fclose(fp); | |
2120 | ||
2121 | return ret; | |
2122 | } | |
2123 | ||
2124 | static struct kprobe_blacklist_node * | |
2125 | kprobe_blacklist__find_by_address(struct list_head *blacklist, | |
2126 | unsigned long address) | |
2127 | { | |
2128 | struct kprobe_blacklist_node *node; | |
2129 | ||
2130 | list_for_each_entry(node, blacklist, list) { | |
2131 | if (node->start <= address && address <= node->end) | |
2132 | return node; | |
2133 | } | |
2134 | ||
2135 | return NULL; | |
2136 | } | |
2137 | ||
b031220d MH |
2138 | static LIST_HEAD(kprobe_blacklist); |
2139 | ||
2140 | static void kprobe_blacklist__init(void) | |
2141 | { | |
2142 | if (!list_empty(&kprobe_blacklist)) | |
2143 | return; | |
2144 | ||
2145 | if (kprobe_blacklist__load(&kprobe_blacklist) < 0) | |
2146 | pr_debug("No kprobe blacklist support, ignored\n"); | |
2147 | } | |
2148 | ||
2149 | static void kprobe_blacklist__release(void) | |
2150 | { | |
2151 | kprobe_blacklist__delete(&kprobe_blacklist); | |
2152 | } | |
2153 | ||
2154 | static bool kprobe_blacklist__listed(unsigned long address) | |
2155 | { | |
2156 | return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); | |
2157 | } | |
2158 | ||
d350bd57 MH |
2159 | static int perf_probe_event__sprintf(const char *group, const char *event, |
2160 | struct perf_probe_event *pev, | |
ba7ecb02 MH |
2161 | const char *module, |
2162 | struct strbuf *result) | |
278498d4 | 2163 | { |
7e990a51 | 2164 | int i, ret; |
278498d4 | 2165 | char buf[128]; |
4235b045 | 2166 | char *place; |
278498d4 | 2167 | |
4235b045 MH |
2168 | /* Synthesize only event probe point */ |
2169 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
2170 | if (!place) |
2171 | return -EINVAL; | |
4235b045 | 2172 | |
d350bd57 | 2173 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
7e990a51 | 2174 | if (ret < 0) |
ba7ecb02 | 2175 | goto out; |
146a1439 | 2176 | |
ba7ecb02 | 2177 | strbuf_addf(result, " %-20s (on %s", buf, place); |
fb226ccd | 2178 | if (module) |
ba7ecb02 | 2179 | strbuf_addf(result, " in %s", module); |
278498d4 | 2180 | |
4235b045 | 2181 | if (pev->nargs > 0) { |
ba7ecb02 | 2182 | strbuf_addstr(result, " with"); |
7df2f329 | 2183 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
2184 | ret = synthesize_perf_probe_arg(&pev->args[i], |
2185 | buf, 128); | |
2186 | if (ret < 0) | |
ba7ecb02 MH |
2187 | goto out; |
2188 | strbuf_addf(result, " %s", buf); | |
7df2f329 | 2189 | } |
278498d4 | 2190 | } |
ba7ecb02 MH |
2191 | strbuf_addch(result, ')'); |
2192 | out: | |
4235b045 | 2193 | free(place); |
146a1439 | 2194 | return ret; |
278498d4 MH |
2195 | } |
2196 | ||
ba7ecb02 | 2197 | /* Show an event */ |
b02137cc NK |
2198 | int show_perf_probe_event(const char *group, const char *event, |
2199 | struct perf_probe_event *pev, | |
2200 | const char *module, bool use_stdout) | |
ba7ecb02 MH |
2201 | { |
2202 | struct strbuf buf = STRBUF_INIT; | |
2203 | int ret; | |
2204 | ||
d350bd57 | 2205 | ret = perf_probe_event__sprintf(group, event, pev, module, &buf); |
ba7ecb02 MH |
2206 | if (ret >= 0) { |
2207 | if (use_stdout) | |
2208 | printf("%s\n", buf.buf); | |
2209 | else | |
2210 | pr_info("%s\n", buf.buf); | |
2211 | } | |
2212 | strbuf_release(&buf); | |
2213 | ||
2214 | return ret; | |
2215 | } | |
2216 | ||
b6a89643 MH |
2217 | static bool filter_probe_trace_event(struct probe_trace_event *tev, |
2218 | struct strfilter *filter) | |
2219 | { | |
2220 | char tmp[128]; | |
2221 | ||
2222 | /* At first, check the event name itself */ | |
2223 | if (strfilter__compare(filter, tev->event)) | |
2224 | return true; | |
2225 | ||
2226 | /* Next, check the combination of name and group */ | |
2227 | if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) | |
2228 | return false; | |
2229 | return strfilter__compare(filter, tmp); | |
2230 | } | |
2231 | ||
2232 | static int __show_perf_probe_events(int fd, bool is_kprobe, | |
2233 | struct strfilter *filter) | |
4de189fe | 2234 | { |
225466f1 | 2235 | int ret = 0; |
0e60836b | 2236 | struct probe_trace_event tev; |
4235b045 | 2237 | struct perf_probe_event pev; |
4de189fe MH |
2238 | struct strlist *rawlist; |
2239 | struct str_node *ent; | |
2240 | ||
4235b045 MH |
2241 | memset(&tev, 0, sizeof(tev)); |
2242 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 2243 | |
92f6c72e | 2244 | rawlist = probe_file__get_rawlist(fd); |
146a1439 | 2245 | if (!rawlist) |
6eb08660 | 2246 | return -ENOMEM; |
4de189fe | 2247 | |
adf365f4 | 2248 | strlist__for_each(ent, rawlist) { |
0e60836b | 2249 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 | 2250 | if (ret >= 0) { |
b6a89643 MH |
2251 | if (!filter_probe_trace_event(&tev, filter)) |
2252 | goto next; | |
225466f1 SD |
2253 | ret = convert_to_perf_probe_event(&tev, &pev, |
2254 | is_kprobe); | |
ba7ecb02 MH |
2255 | if (ret < 0) |
2256 | goto next; | |
d350bd57 MH |
2257 | ret = show_perf_probe_event(pev.group, pev.event, |
2258 | &pev, tev.point.module, | |
ba7ecb02 | 2259 | true); |
146a1439 | 2260 | } |
b6a89643 | 2261 | next: |
4235b045 | 2262 | clear_perf_probe_event(&pev); |
0e60836b | 2263 | clear_probe_trace_event(&tev); |
146a1439 MH |
2264 | if (ret < 0) |
2265 | break; | |
4de189fe | 2266 | } |
4de189fe | 2267 | strlist__delete(rawlist); |
7737af01 MH |
2268 | /* Cleanup cached debuginfo if needed */ |
2269 | debuginfo_cache__exit(); | |
146a1439 MH |
2270 | |
2271 | return ret; | |
4de189fe MH |
2272 | } |
2273 | ||
225466f1 | 2274 | /* List up current perf-probe events */ |
b6a89643 | 2275 | int show_perf_probe_events(struct strfilter *filter) |
225466f1 | 2276 | { |
5e45187c | 2277 | int kp_fd, up_fd, ret; |
225466f1 SD |
2278 | |
2279 | setup_pager(); | |
225466f1 | 2280 | |
9bae1e8c | 2281 | ret = init_probe_symbol_maps(false); |
225466f1 SD |
2282 | if (ret < 0) |
2283 | return ret; | |
2284 | ||
92f6c72e MH |
2285 | ret = probe_file__open_both(&kp_fd, &up_fd, 0); |
2286 | if (ret < 0) | |
2287 | return ret; | |
225466f1 | 2288 | |
92f6c72e MH |
2289 | if (kp_fd >= 0) |
2290 | ret = __show_perf_probe_events(kp_fd, true, filter); | |
2291 | if (up_fd >= 0 && ret >= 0) | |
b6a89643 | 2292 | ret = __show_perf_probe_events(up_fd, false, filter); |
92f6c72e MH |
2293 | if (kp_fd > 0) |
2294 | close(kp_fd); | |
2295 | if (up_fd > 0) | |
5e45187c | 2296 | close(up_fd); |
9bae1e8c | 2297 | exit_probe_symbol_maps(); |
225466f1 | 2298 | |
146a1439 | 2299 | return ret; |
50656eec MH |
2300 | } |
2301 | ||
146a1439 MH |
2302 | static int get_new_event_name(char *buf, size_t len, const char *base, |
2303 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
2304 | { |
2305 | int i, ret; | |
663b1151 | 2306 | char *p, *nbase; |
17f88fcd | 2307 | |
3099c026 NR |
2308 | if (*base == '.') |
2309 | base++; | |
663b1151 MH |
2310 | nbase = strdup(base); |
2311 | if (!nbase) | |
2312 | return -ENOMEM; | |
2313 | ||
2314 | /* Cut off the dot suffixes (e.g. .const, .isra)*/ | |
2315 | p = strchr(nbase, '.'); | |
2316 | if (p && p != nbase) | |
2317 | *p = '\0'; | |
3099c026 | 2318 | |
663b1151 MH |
2319 | /* Try no suffix number */ |
2320 | ret = e_snprintf(buf, len, "%s", nbase); | |
146a1439 | 2321 | if (ret < 0) { |
5f03cba4 | 2322 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2323 | goto out; |
146a1439 | 2324 | } |
17f88fcd | 2325 | if (!strlist__has_entry(namelist, buf)) |
663b1151 | 2326 | goto out; |
17f88fcd | 2327 | |
d761b08b | 2328 | if (!allow_suffix) { |
03e01f56 WN |
2329 | pr_warning("Error: event \"%s\" already exists.\n" |
2330 | " Hint: Remove existing event by 'perf probe -d'\n" | |
2331 | " or force duplicates by 'perf probe -f'\n" | |
2332 | " or set 'force=yes' in BPF source.\n", | |
2333 | buf); | |
663b1151 MH |
2334 | ret = -EEXIST; |
2335 | goto out; | |
d761b08b MH |
2336 | } |
2337 | ||
17f88fcd MH |
2338 | /* Try to add suffix */ |
2339 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
663b1151 | 2340 | ret = e_snprintf(buf, len, "%s_%d", nbase, i); |
146a1439 | 2341 | if (ret < 0) { |
5f03cba4 | 2342 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2343 | goto out; |
146a1439 | 2344 | } |
b498ce1f MH |
2345 | if (!strlist__has_entry(namelist, buf)) |
2346 | break; | |
2347 | } | |
146a1439 MH |
2348 | if (i == MAX_EVENT_INDEX) { |
2349 | pr_warning("Too many events are on the same function.\n"); | |
2350 | ret = -ERANGE; | |
2351 | } | |
2352 | ||
663b1151 MH |
2353 | out: |
2354 | free(nbase); | |
146a1439 | 2355 | return ret; |
b498ce1f MH |
2356 | } |
2357 | ||
79702f61 MH |
2358 | /* Warn if the current kernel's uprobe implementation is old */ |
2359 | static void warn_uprobe_event_compat(struct probe_trace_event *tev) | |
2360 | { | |
2361 | int i; | |
2362 | char *buf = synthesize_probe_trace_command(tev); | |
2363 | ||
2364 | /* Old uprobe event doesn't support memory dereference */ | |
2365 | if (!tev->uprobes || tev->nargs == 0 || !buf) | |
2366 | goto out; | |
2367 | ||
2368 | for (i = 0; i < tev->nargs; i++) | |
2369 | if (strglobmatch(tev->args[i].value, "[$@+-]*")) { | |
2370 | pr_warning("Please upgrade your kernel to at least " | |
2371 | "3.14 to have access to feature %s\n", | |
2372 | tev->args[i].value); | |
2373 | break; | |
2374 | } | |
2375 | out: | |
2376 | free(buf); | |
2377 | } | |
2378 | ||
a3c9de62 MH |
2379 | /* Set new name from original perf_probe_event and namelist */ |
2380 | static int probe_trace_event__set_name(struct probe_trace_event *tev, | |
2381 | struct perf_probe_event *pev, | |
2382 | struct strlist *namelist, | |
2383 | bool allow_suffix) | |
2384 | { | |
2385 | const char *event, *group; | |
2386 | char buf[64]; | |
2387 | int ret; | |
2388 | ||
2389 | if (pev->event) | |
2390 | event = pev->event; | |
2391 | else | |
da15bd9d WN |
2392 | if (pev->point.function && |
2393 | (strncmp(pev->point.function, "0x", 2) != 0) && | |
2394 | !strisglob(pev->point.function)) | |
a3c9de62 MH |
2395 | event = pev->point.function; |
2396 | else | |
2397 | event = tev->point.realname; | |
2398 | if (pev->group) | |
2399 | group = pev->group; | |
2400 | else | |
2401 | group = PERFPROBE_GROUP; | |
2402 | ||
2403 | /* Get an unused new event name */ | |
2404 | ret = get_new_event_name(buf, 64, event, | |
2405 | namelist, allow_suffix); | |
2406 | if (ret < 0) | |
2407 | return ret; | |
2408 | ||
2409 | event = buf; | |
2410 | ||
2411 | tev->event = strdup(event); | |
2412 | tev->group = strdup(group); | |
2413 | if (tev->event == NULL || tev->group == NULL) | |
2414 | return -ENOMEM; | |
2415 | ||
2416 | /* Add added event name to namelist */ | |
2417 | strlist__add(namelist, event); | |
2418 | return 0; | |
2419 | } | |
2420 | ||
0e60836b SD |
2421 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
2422 | struct probe_trace_event *tevs, | |
146a1439 | 2423 | int ntevs, bool allow_suffix) |
50656eec | 2424 | { |
146a1439 | 2425 | int i, fd, ret; |
0e60836b | 2426 | struct probe_trace_event *tev = NULL; |
b498ce1f | 2427 | struct strlist *namelist; |
50656eec | 2428 | |
92f6c72e MH |
2429 | fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0)); |
2430 | if (fd < 0) | |
146a1439 | 2431 | return fd; |
5e45187c | 2432 | |
b498ce1f | 2433 | /* Get current event names */ |
92f6c72e | 2434 | namelist = probe_file__get_namelist(fd); |
146a1439 MH |
2435 | if (!namelist) { |
2436 | pr_debug("Failed to get current event list.\n"); | |
ae2cb1ac MH |
2437 | ret = -ENOMEM; |
2438 | goto close_out; | |
146a1439 | 2439 | } |
4235b045 | 2440 | |
146a1439 | 2441 | ret = 0; |
02b95dad | 2442 | for (i = 0; i < ntevs; i++) { |
4235b045 | 2443 | tev = &tevs[i]; |
b031220d | 2444 | /* Skip if the symbol is out of .text or blacklisted */ |
5a51fcd1 MH |
2445 | if (!tev->point.symbol) |
2446 | continue; | |
9aaf5a5f | 2447 | |
a3c9de62 MH |
2448 | /* Set new name for tev (and update namelist) */ |
2449 | ret = probe_trace_event__set_name(tev, pev, namelist, | |
2450 | allow_suffix); | |
146a1439 MH |
2451 | if (ret < 0) |
2452 | break; | |
4235b045 | 2453 | |
92f6c72e | 2454 | ret = probe_file__add_event(fd, tev); |
146a1439 MH |
2455 | if (ret < 0) |
2456 | break; | |
4235b045 | 2457 | |
4235b045 MH |
2458 | /* |
2459 | * Probes after the first probe which comes from same | |
2460 | * user input are always allowed to add suffix, because | |
2461 | * there might be several addresses corresponding to | |
2462 | * one code line. | |
2463 | */ | |
2464 | allow_suffix = true; | |
50656eec | 2465 | } |
79702f61 MH |
2466 | if (ret == -EINVAL && pev->uprobes) |
2467 | warn_uprobe_event_compat(tev); | |
146a1439 | 2468 | |
e1d2017b | 2469 | strlist__delete(namelist); |
ae2cb1ac | 2470 | close_out: |
50656eec | 2471 | close(fd); |
146a1439 | 2472 | return ret; |
50656eec | 2473 | } |
fa28244d | 2474 | |
6bb536cc WN |
2475 | static int find_probe_functions(struct map *map, char *name, |
2476 | struct symbol **syms) | |
eb948e50 | 2477 | { |
564c62a4 | 2478 | int found = 0; |
0a3873a8 | 2479 | struct symbol *sym; |
4c859351 | 2480 | struct rb_node *tmp; |
564c62a4 | 2481 | |
75e4a2a6 WN |
2482 | if (map__load(map, NULL) < 0) |
2483 | return 0; | |
2484 | ||
4c859351 | 2485 | map__for_each_symbol(map, sym, tmp) { |
6bb536cc | 2486 | if (strglobmatch(sym->name, name)) { |
4c859351 | 2487 | found++; |
6bb536cc WN |
2488 | if (syms && found < probe_conf.max_probes) |
2489 | syms[found - 1] = sym; | |
2490 | } | |
eb948e50 | 2491 | } |
564c62a4 NK |
2492 | |
2493 | return found; | |
eb948e50 MH |
2494 | } |
2495 | ||
2496 | #define strdup_or_goto(str, label) \ | |
2497 | ({ char *__p = strdup(str); if (!__p) goto label; __p; }) | |
2498 | ||
7b6ff0bd NR |
2499 | void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, |
2500 | struct probe_trace_event *tev __maybe_unused, | |
2501 | struct map *map __maybe_unused) { } | |
2502 | ||
eb948e50 MH |
2503 | /* |
2504 | * Find probe function addresses from map. | |
2505 | * Return an error or the number of found probe_trace_event | |
2506 | */ | |
2507 | static int find_probe_trace_events_from_map(struct perf_probe_event *pev, | |
ddb2f58f | 2508 | struct probe_trace_event **tevs) |
e0faa8d3 | 2509 | { |
eb948e50 | 2510 | struct map *map = NULL; |
eb948e50 | 2511 | struct ref_reloc_sym *reloc_sym = NULL; |
e0faa8d3 | 2512 | struct symbol *sym; |
6bb536cc | 2513 | struct symbol **syms = NULL; |
0e60836b | 2514 | struct probe_trace_event *tev; |
eb948e50 MH |
2515 | struct perf_probe_point *pp = &pev->point; |
2516 | struct probe_trace_point *tp; | |
564c62a4 | 2517 | int num_matched_functions; |
b031220d | 2518 | int ret, i, j, skipped = 0; |
4235b045 | 2519 | |
44225521 | 2520 | map = get_target_map(pev->target, pev->uprobes); |
eb948e50 MH |
2521 | if (!map) { |
2522 | ret = -EINVAL; | |
2523 | goto out; | |
fb7345bb MH |
2524 | } |
2525 | ||
6bb536cc WN |
2526 | syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); |
2527 | if (!syms) { | |
2528 | ret = -ENOMEM; | |
2529 | goto out; | |
2530 | } | |
2531 | ||
eb948e50 MH |
2532 | /* |
2533 | * Load matched symbols: Since the different local symbols may have | |
2534 | * same name but different addresses, this lists all the symbols. | |
2535 | */ | |
6bb536cc | 2536 | num_matched_functions = find_probe_functions(map, pp->function, syms); |
564c62a4 | 2537 | if (num_matched_functions == 0) { |
eb948e50 | 2538 | pr_err("Failed to find symbol %s in %s\n", pp->function, |
44225521 | 2539 | pev->target ? : "kernel"); |
eb948e50 MH |
2540 | ret = -ENOENT; |
2541 | goto out; | |
ddb2f58f | 2542 | } else if (num_matched_functions > probe_conf.max_probes) { |
eb948e50 | 2543 | pr_err("Too many functions matched in %s\n", |
44225521 | 2544 | pev->target ? : "kernel"); |
eb948e50 MH |
2545 | ret = -E2BIG; |
2546 | goto out; | |
fb7345bb MH |
2547 | } |
2548 | ||
1a8ac29c MH |
2549 | /* Note that the symbols in the kmodule are not relocated */ |
2550 | if (!pev->uprobes && !pp->retprobe && !pev->target) { | |
0560a0c4 | 2551 | reloc_sym = kernel_get_ref_reloc_sym(); |
eb948e50 MH |
2552 | if (!reloc_sym) { |
2553 | pr_warning("Relocated base symbol is not found!\n"); | |
2554 | ret = -EINVAL; | |
2555 | goto out; | |
2556 | } | |
2557 | } | |
4235b045 | 2558 | |
eb948e50 MH |
2559 | /* Setup result trace-probe-events */ |
2560 | *tevs = zalloc(sizeof(*tev) * num_matched_functions); | |
2561 | if (!*tevs) { | |
02b95dad | 2562 | ret = -ENOMEM; |
eb948e50 | 2563 | goto out; |
02b95dad | 2564 | } |
ce27a443 | 2565 | |
eb948e50 | 2566 | ret = 0; |
564c62a4 | 2567 | |
6bb536cc WN |
2568 | for (j = 0; j < num_matched_functions; j++) { |
2569 | sym = syms[j]; | |
2570 | ||
eb948e50 MH |
2571 | tev = (*tevs) + ret; |
2572 | tp = &tev->point; | |
2573 | if (ret == num_matched_functions) { | |
2574 | pr_warning("Too many symbols are listed. Skip it.\n"); | |
2575 | break; | |
ce27a443 | 2576 | } |
eb948e50 | 2577 | ret++; |
ce27a443 | 2578 | |
eb948e50 MH |
2579 | if (pp->offset > sym->end - sym->start) { |
2580 | pr_warning("Offset %ld is bigger than the size of %s\n", | |
2581 | pp->offset, sym->name); | |
2582 | ret = -ENOENT; | |
2583 | goto err_out; | |
2584 | } | |
2585 | /* Add one probe point */ | |
2586 | tp->address = map->unmap_ip(map, sym->start) + pp->offset; | |
1a8ac29c MH |
2587 | |
2588 | /* Check the kprobe (not in module) is within .text */ | |
2589 | if (!pev->uprobes && !pev->target && | |
b031220d MH |
2590 | kprobe_warn_out_range(sym->name, tp->address)) { |
2591 | tp->symbol = NULL; /* Skip it */ | |
2592 | skipped++; | |
2593 | } else if (reloc_sym) { | |
eb948e50 MH |
2594 | tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); |
2595 | tp->offset = tp->address - reloc_sym->addr; | |
2596 | } else { | |
2597 | tp->symbol = strdup_or_goto(sym->name, nomem_out); | |
2598 | tp->offset = pp->offset; | |
2599 | } | |
6bb536cc WN |
2600 | tp->realname = strdup_or_goto(sym->name, nomem_out); |
2601 | ||
eb948e50 | 2602 | tp->retprobe = pp->retprobe; |
44225521 MH |
2603 | if (pev->target) |
2604 | tev->point.module = strdup_or_goto(pev->target, | |
2605 | nomem_out); | |
eb948e50 MH |
2606 | tev->uprobes = pev->uprobes; |
2607 | tev->nargs = pev->nargs; | |
2608 | if (tev->nargs) { | |
2609 | tev->args = zalloc(sizeof(struct probe_trace_arg) * | |
2610 | tev->nargs); | |
2611 | if (tev->args == NULL) | |
2612 | goto nomem_out; | |
e334016f | 2613 | } |
48481938 | 2614 | for (i = 0; i < tev->nargs; i++) { |
eb948e50 MH |
2615 | if (pev->args[i].name) |
2616 | tev->args[i].name = | |
2617 | strdup_or_goto(pev->args[i].name, | |
2618 | nomem_out); | |
2619 | ||
2620 | tev->args[i].value = strdup_or_goto(pev->args[i].var, | |
2621 | nomem_out); | |
2622 | if (pev->args[i].type) | |
2623 | tev->args[i].type = | |
2624 | strdup_or_goto(pev->args[i].type, | |
2625 | nomem_out); | |
48481938 | 2626 | } |
7b6ff0bd | 2627 | arch__fix_tev_from_maps(pev, tev, map); |
4235b045 | 2628 | } |
b031220d MH |
2629 | if (ret == skipped) { |
2630 | ret = -ENOENT; | |
2631 | goto err_out; | |
2632 | } | |
4235b045 | 2633 | |
eb948e50 | 2634 | out: |
9b118aca | 2635 | put_target_map(map, pev->uprobes); |
6bb536cc | 2636 | free(syms); |
eb948e50 | 2637 | return ret; |
225466f1 | 2638 | |
eb948e50 MH |
2639 | nomem_out: |
2640 | ret = -ENOMEM; | |
2641 | err_out: | |
2642 | clear_probe_trace_events(*tevs, num_matched_functions); | |
2643 | zfree(tevs); | |
2644 | goto out; | |
2645 | } | |
1c1bc922 | 2646 | |
da15bd9d WN |
2647 | static int try_to_find_absolute_address(struct perf_probe_event *pev, |
2648 | struct probe_trace_event **tevs) | |
2649 | { | |
2650 | struct perf_probe_point *pp = &pev->point; | |
2651 | struct probe_trace_event *tev; | |
2652 | struct probe_trace_point *tp; | |
2653 | int i, err; | |
2654 | ||
2655 | if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) | |
2656 | return -EINVAL; | |
2657 | if (perf_probe_event_need_dwarf(pev)) | |
2658 | return -EINVAL; | |
2659 | ||
2660 | /* | |
2661 | * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at | |
2662 | * absolute address. | |
2663 | * | |
2664 | * Only one tev can be generated by this. | |
2665 | */ | |
2666 | *tevs = zalloc(sizeof(*tev)); | |
2667 | if (!*tevs) | |
2668 | return -ENOMEM; | |
2669 | ||
2670 | tev = *tevs; | |
2671 | tp = &tev->point; | |
2672 | ||
2673 | /* | |
2674 | * Don't use tp->offset, use address directly, because | |
2675 | * in synthesize_probe_trace_command() address cannot be | |
2676 | * zero. | |
2677 | */ | |
2678 | tp->address = pev->point.abs_address; | |
2679 | tp->retprobe = pp->retprobe; | |
2680 | tev->uprobes = pev->uprobes; | |
2681 | ||
2682 | err = -ENOMEM; | |
2683 | /* | |
2684 | * Give it a '0x' leading symbol name. | |
2685 | * In __add_probe_trace_events, a NULL symbol is interpreted as | |
2686 | * invalud. | |
2687 | */ | |
2688 | if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) | |
2689 | goto errout; | |
2690 | ||
2691 | /* For kprobe, check range */ | |
2692 | if ((!tev->uprobes) && | |
2693 | (kprobe_warn_out_range(tev->point.symbol, | |
2694 | tev->point.address))) { | |
2695 | err = -EACCES; | |
2696 | goto errout; | |
2697 | } | |
2698 | ||
2699 | if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) | |
2700 | goto errout; | |
2701 | ||
2702 | if (pev->target) { | |
2703 | tp->module = strdup(pev->target); | |
2704 | if (!tp->module) | |
2705 | goto errout; | |
2706 | } | |
2707 | ||
2708 | if (tev->group) { | |
2709 | tev->group = strdup(pev->group); | |
2710 | if (!tev->group) | |
2711 | goto errout; | |
2712 | } | |
2713 | ||
2714 | if (pev->event) { | |
2715 | tev->event = strdup(pev->event); | |
2716 | if (!tev->event) | |
2717 | goto errout; | |
2718 | } | |
2719 | ||
2720 | tev->nargs = pev->nargs; | |
2721 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
2722 | if (!tev->args) { | |
2723 | err = -ENOMEM; | |
2724 | goto errout; | |
2725 | } | |
2726 | for (i = 0; i < tev->nargs; i++) | |
2727 | copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); | |
2728 | ||
2729 | return 1; | |
2730 | ||
2731 | errout: | |
2732 | if (*tevs) { | |
2733 | clear_probe_trace_events(*tevs, 1); | |
2734 | *tevs = NULL; | |
2735 | } | |
2736 | return err; | |
2737 | } | |
2738 | ||
d5c2e2c1 NR |
2739 | bool __weak arch__prefers_symtab(void) { return false; } |
2740 | ||
eb948e50 | 2741 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 2742 | struct probe_trace_event **tevs) |
eb948e50 MH |
2743 | { |
2744 | int ret; | |
2745 | ||
2746 | if (pev->uprobes && !pev->group) { | |
2747 | /* Replace group name if not given */ | |
44225521 | 2748 | ret = convert_exec_to_group(pev->target, &pev->group); |
eb948e50 MH |
2749 | if (ret != 0) { |
2750 | pr_warning("Failed to make a group name.\n"); | |
2751 | return ret; | |
2752 | } | |
02b95dad | 2753 | } |
e334016f | 2754 | |
da15bd9d WN |
2755 | ret = try_to_find_absolute_address(pev, tevs); |
2756 | if (ret > 0) | |
2757 | return ret; | |
2758 | ||
d5c2e2c1 | 2759 | if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) { |
ddb2f58f | 2760 | ret = find_probe_trace_events_from_map(pev, tevs); |
d5c2e2c1 NR |
2761 | if (ret > 0) |
2762 | return ret; /* Found in symbol table */ | |
2763 | } | |
2764 | ||
eb948e50 | 2765 | /* Convert perf_probe_event with debuginfo */ |
ddb2f58f | 2766 | ret = try_to_find_probe_trace_events(pev, tevs); |
eb948e50 MH |
2767 | if (ret != 0) |
2768 | return ret; /* Found in debuginfo or got an error */ | |
2769 | ||
ddb2f58f | 2770 | return find_probe_trace_events_from_map(pev, tevs); |
4235b045 MH |
2771 | } |
2772 | ||
12fae5ef | 2773 | int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
4235b045 | 2774 | { |
844dffa5 | 2775 | int i, ret; |
4235b045 | 2776 | |
4235b045 MH |
2777 | /* Loop 1: convert all events */ |
2778 | for (i = 0; i < npevs; i++) { | |
b031220d | 2779 | /* Init kprobe blacklist if needed */ |
12fae5ef | 2780 | if (!pevs[i].uprobes) |
b031220d | 2781 | kprobe_blacklist__init(); |
4235b045 | 2782 | /* Convert with or without debuginfo */ |
12fae5ef | 2783 | ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); |
146a1439 | 2784 | if (ret < 0) |
844dffa5 | 2785 | return ret; |
12fae5ef | 2786 | pevs[i].ntevs = ret; |
e0faa8d3 | 2787 | } |
b031220d MH |
2788 | /* This just release blacklist only if allocated */ |
2789 | kprobe_blacklist__release(); | |
e0faa8d3 | 2790 | |
844dffa5 NK |
2791 | return 0; |
2792 | } | |
2793 | ||
12fae5ef | 2794 | int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
2795 | { |
2796 | int i, ret = 0; | |
2797 | ||
4235b045 | 2798 | /* Loop 2: add all events */ |
8635bf6e | 2799 | for (i = 0; i < npevs; i++) { |
12fae5ef WN |
2800 | ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, |
2801 | pevs[i].ntevs, | |
ddb2f58f | 2802 | probe_conf.force_add); |
fbee632d ACM |
2803 | if (ret < 0) |
2804 | break; | |
2805 | } | |
844dffa5 NK |
2806 | return ret; |
2807 | } | |
2808 | ||
12fae5ef | 2809 | void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
2810 | { |
2811 | int i, j; | |
2812 | ||
449e5b24 MH |
2813 | /* Loop 3: cleanup and free trace events */ |
2814 | for (i = 0; i < npevs; i++) { | |
12fae5ef WN |
2815 | for (j = 0; j < pevs[i].ntevs; j++) |
2816 | clear_probe_trace_event(&pevs[i].tevs[j]); | |
2817 | zfree(&pevs[i].tevs); | |
2818 | pevs[i].ntevs = 0; | |
a43aac29 | 2819 | clear_perf_probe_event(&pevs[i]); |
449e5b24 | 2820 | } |
844dffa5 NK |
2821 | } |
2822 | ||
2823 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) | |
2824 | { | |
2825 | int ret; | |
844dffa5 | 2826 | |
9bae1e8c NK |
2827 | ret = init_probe_symbol_maps(pevs->uprobes); |
2828 | if (ret < 0) | |
2829 | return ret; | |
2830 | ||
12fae5ef | 2831 | ret = convert_perf_probe_events(pevs, npevs); |
844dffa5 | 2832 | if (ret == 0) |
12fae5ef | 2833 | ret = apply_perf_probe_events(pevs, npevs); |
844dffa5 | 2834 | |
12fae5ef | 2835 | cleanup_perf_probe_events(pevs, npevs); |
146a1439 | 2836 | |
9bae1e8c | 2837 | exit_probe_symbol_maps(); |
146a1439 | 2838 | return ret; |
e0faa8d3 MH |
2839 | } |
2840 | ||
307a464b | 2841 | int del_perf_probe_events(struct strfilter *filter) |
fa28244d | 2842 | { |
307a464b | 2843 | int ret, ret2, ufd = -1, kfd = -1; |
307a464b MH |
2844 | char *str = strfilter__string(filter); |
2845 | ||
2846 | if (!str) | |
2847 | return -EINVAL; | |
2848 | ||
fa28244d | 2849 | /* Get current event names */ |
92f6c72e MH |
2850 | ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); |
2851 | if (ret < 0) | |
2852 | goto out; | |
467ec085 | 2853 | |
92f6c72e | 2854 | ret = probe_file__del_events(kfd, filter); |
307a464b | 2855 | if (ret < 0 && ret != -ENOENT) |
225466f1 | 2856 | goto error; |
225466f1 | 2857 | |
92f6c72e | 2858 | ret2 = probe_file__del_events(ufd, filter); |
dddc7ee3 | 2859 | if (ret2 < 0 && ret2 != -ENOENT) { |
307a464b | 2860 | ret = ret2; |
dddc7ee3 MH |
2861 | goto error; |
2862 | } | |
dddc7ee3 | 2863 | ret = 0; |
225466f1 SD |
2864 | |
2865 | error: | |
92f6c72e | 2866 | if (kfd >= 0) |
225466f1 | 2867 | close(kfd); |
92f6c72e | 2868 | if (ufd >= 0) |
225466f1 | 2869 | close(ufd); |
92f6c72e | 2870 | out: |
307a464b | 2871 | free(str); |
146a1439 MH |
2872 | |
2873 | return ret; | |
fa28244d | 2874 | } |
225466f1 | 2875 | |
3c42258c MH |
2876 | /* TODO: don't use a global variable for filter ... */ |
2877 | static struct strfilter *available_func_filter; | |
fa28244d | 2878 | |
e80711ca | 2879 | /* |
3c42258c MH |
2880 | * If a symbol corresponds to a function with global binding and |
2881 | * matches filter return 0. For all others return 1. | |
e80711ca | 2882 | */ |
1d037ca1 | 2883 | static int filter_available_functions(struct map *map __maybe_unused, |
3c42258c | 2884 | struct symbol *sym) |
e80711ca | 2885 | { |
e578da3b | 2886 | if (strfilter__compare(available_func_filter, sym->name)) |
3c42258c MH |
2887 | return 0; |
2888 | return 1; | |
e80711ca MH |
2889 | } |
2890 | ||
2df58634 MH |
2891 | int show_available_funcs(const char *target, struct strfilter *_filter, |
2892 | bool user) | |
e80711ca MH |
2893 | { |
2894 | struct map *map; | |
2895 | int ret; | |
2896 | ||
9bae1e8c | 2897 | ret = init_probe_symbol_maps(user); |
e80711ca MH |
2898 | if (ret < 0) |
2899 | return ret; | |
2900 | ||
2df58634 MH |
2901 | /* Get a symbol map */ |
2902 | if (user) | |
2903 | map = dso__new_map(target); | |
2904 | else | |
2905 | map = kernel_get_module_map(target); | |
e80711ca | 2906 | if (!map) { |
2df58634 | 2907 | pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); |
e80711ca MH |
2908 | return -EINVAL; |
2909 | } | |
225466f1 | 2910 | |
2df58634 | 2911 | /* Load symbols with given filter */ |
3c42258c | 2912 | available_func_filter = _filter; |
2df58634 MH |
2913 | if (map__load(map, filter_available_functions)) { |
2914 | pr_err("Failed to load symbols in %s\n", (target) ? : "kernel"); | |
2915 | goto end; | |
2916 | } | |
2917 | if (!dso__sorted_by_name(map->dso, map->type)) | |
2918 | dso__sort_by_name(map->dso, map->type); | |
225466f1 | 2919 | |
2df58634 MH |
2920 | /* Show all (filtered) symbols */ |
2921 | setup_pager(); | |
2922 | dso__fprintf_symbols_by_name(map->dso, map->type, stdout); | |
2923 | end: | |
2924 | if (user) { | |
84c2cafa | 2925 | map__put(map); |
2df58634 | 2926 | } |
9bae1e8c | 2927 | exit_probe_symbol_maps(); |
225466f1 | 2928 | |
2df58634 | 2929 | return ret; |
225466f1 SD |
2930 | } |
2931 | ||
da15bd9d WN |
2932 | int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, |
2933 | struct perf_probe_arg *pvar) | |
2934 | { | |
2935 | tvar->value = strdup(pvar->var); | |
2936 | if (tvar->value == NULL) | |
2937 | return -ENOMEM; | |
2938 | if (pvar->type) { | |
2939 | tvar->type = strdup(pvar->type); | |
2940 | if (tvar->type == NULL) | |
2941 | return -ENOMEM; | |
2942 | } | |
2943 | if (pvar->name) { | |
2944 | tvar->name = strdup(pvar->name); | |
2945 | if (tvar->name == NULL) | |
2946 | return -ENOMEM; | |
2947 | } else | |
2948 | tvar->name = NULL; | |
2949 | return 0; | |
2950 | } |