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Commit | Line | Data |
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50656eec | 1 | /* |
0e60836b | 2 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
3 | * |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
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 | ||
c61fb959 RB |
268 | /* |
269 | * NOTE: | |
270 | * '.gnu.linkonce.this_module' section of kernel module elf directly | |
271 | * maps to 'struct module' from linux/module.h. This section contains | |
272 | * actual module name which will be used by kernel after loading it. | |
273 | * But, we cannot use 'struct module' here since linux/module.h is not | |
274 | * exposed to user-space. Offset of 'name' has remained same from long | |
275 | * time, so hardcoding it here. | |
276 | */ | |
277 | #ifdef __LP64__ | |
278 | #define MOD_NAME_OFFSET 24 | |
279 | #else | |
280 | #define MOD_NAME_OFFSET 12 | |
281 | #endif | |
282 | ||
283 | /* | |
284 | * @module can be module name of module file path. In case of path, | |
285 | * inspect elf and find out what is actual module name. | |
286 | * Caller has to free mod_name after using it. | |
287 | */ | |
288 | static char *find_module_name(const char *module) | |
289 | { | |
290 | int fd; | |
291 | Elf *elf; | |
292 | GElf_Ehdr ehdr; | |
293 | GElf_Shdr shdr; | |
294 | Elf_Data *data; | |
295 | Elf_Scn *sec; | |
296 | char *mod_name = NULL; | |
297 | ||
298 | fd = open(module, O_RDONLY); | |
299 | if (fd < 0) | |
300 | return NULL; | |
301 | ||
302 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
303 | if (elf == NULL) | |
304 | goto elf_err; | |
305 | ||
306 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
307 | goto ret_err; | |
308 | ||
309 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
310 | ".gnu.linkonce.this_module", NULL); | |
311 | if (!sec) | |
312 | goto ret_err; | |
313 | ||
314 | data = elf_getdata(sec, NULL); | |
315 | if (!data || !data->d_buf) | |
316 | goto ret_err; | |
317 | ||
318 | mod_name = strdup((char *)data->d_buf + MOD_NAME_OFFSET); | |
319 | ||
320 | ret_err: | |
321 | elf_end(elf); | |
322 | elf_err: | |
323 | close(fd); | |
324 | return mod_name; | |
325 | } | |
326 | ||
89fe808a | 327 | #ifdef HAVE_DWARF_SUPPORT |
60fb7742 WN |
328 | |
329 | static int kernel_get_module_dso(const char *module, struct dso **pdso) | |
330 | { | |
331 | struct dso *dso; | |
332 | struct map *map; | |
333 | const char *vmlinux_name; | |
334 | int ret = 0; | |
335 | ||
336 | if (module) { | |
266fa2b2 ACM |
337 | char module_name[128]; |
338 | ||
339 | snprintf(module_name, sizeof(module_name), "[%s]", module); | |
340 | map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name); | |
341 | if (map) { | |
342 | dso = map->dso; | |
343 | goto found; | |
60fb7742 WN |
344 | } |
345 | pr_debug("Failed to find module %s.\n", module); | |
346 | return -ENOENT; | |
347 | } | |
348 | ||
a5e813c6 | 349 | map = machine__kernel_map(host_machine); |
60fb7742 WN |
350 | dso = map->dso; |
351 | ||
352 | vmlinux_name = symbol_conf.vmlinux_name; | |
353 | dso->load_errno = 0; | |
354 | if (vmlinux_name) | |
355 | ret = dso__load_vmlinux(dso, map, vmlinux_name, false, NULL); | |
356 | else | |
357 | ret = dso__load_vmlinux_path(dso, map, NULL); | |
358 | found: | |
359 | *pdso = dso; | |
360 | return ret; | |
361 | } | |
362 | ||
9b118aca MH |
363 | /* |
364 | * Some binaries like glibc have special symbols which are on the symbol | |
365 | * table, but not in the debuginfo. If we can find the address of the | |
366 | * symbol from map, we can translate the address back to the probe point. | |
367 | */ | |
368 | static int find_alternative_probe_point(struct debuginfo *dinfo, | |
369 | struct perf_probe_point *pp, | |
370 | struct perf_probe_point *result, | |
371 | const char *target, bool uprobes) | |
372 | { | |
373 | struct map *map = NULL; | |
374 | struct symbol *sym; | |
375 | u64 address = 0; | |
376 | int ret = -ENOENT; | |
377 | ||
378 | /* This can work only for function-name based one */ | |
379 | if (!pp->function || pp->file) | |
380 | return -ENOTSUP; | |
381 | ||
382 | map = get_target_map(target, uprobes); | |
383 | if (!map) | |
384 | return -EINVAL; | |
385 | ||
386 | /* Find the address of given function */ | |
387 | map__for_each_symbol_by_name(map, pp->function, sym) { | |
e6d7c91c MH |
388 | if (uprobes) |
389 | address = sym->start; | |
390 | else | |
391 | address = map->unmap_ip(map, sym->start); | |
e578da3b | 392 | break; |
9b118aca MH |
393 | } |
394 | if (!address) { | |
395 | ret = -ENOENT; | |
396 | goto out; | |
397 | } | |
f6c15621 WN |
398 | pr_debug("Symbol %s address found : %" PRIx64 "\n", |
399 | pp->function, address); | |
9b118aca MH |
400 | |
401 | ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, | |
402 | result); | |
403 | if (ret <= 0) | |
404 | ret = (!ret) ? -ENOENT : ret; | |
405 | else { | |
406 | result->offset += pp->offset; | |
407 | result->line += pp->line; | |
9d7b45c5 | 408 | result->retprobe = pp->retprobe; |
9b118aca MH |
409 | ret = 0; |
410 | } | |
411 | ||
412 | out: | |
413 | put_target_map(map, uprobes); | |
414 | return ret; | |
415 | ||
416 | } | |
417 | ||
418 | static int get_alternative_probe_event(struct debuginfo *dinfo, | |
419 | struct perf_probe_event *pev, | |
44225521 | 420 | struct perf_probe_point *tmp) |
9b118aca MH |
421 | { |
422 | int ret; | |
423 | ||
424 | memcpy(tmp, &pev->point, sizeof(*tmp)); | |
425 | memset(&pev->point, 0, sizeof(pev->point)); | |
426 | ret = find_alternative_probe_point(dinfo, tmp, &pev->point, | |
44225521 | 427 | pev->target, pev->uprobes); |
9b118aca MH |
428 | if (ret < 0) |
429 | memcpy(&pev->point, tmp, sizeof(*tmp)); | |
430 | ||
431 | return ret; | |
432 | } | |
a15ad2f5 | 433 | |
811dd2ae MH |
434 | static int get_alternative_line_range(struct debuginfo *dinfo, |
435 | struct line_range *lr, | |
436 | const char *target, bool user) | |
437 | { | |
6d4a4896 DA |
438 | struct perf_probe_point pp = { .function = lr->function, |
439 | .file = lr->file, | |
440 | .line = lr->start }; | |
441 | struct perf_probe_point result; | |
811dd2ae MH |
442 | int ret, len = 0; |
443 | ||
6d4a4896 DA |
444 | memset(&result, 0, sizeof(result)); |
445 | ||
811dd2ae MH |
446 | if (lr->end != INT_MAX) |
447 | len = lr->end - lr->start; | |
448 | ret = find_alternative_probe_point(dinfo, &pp, &result, | |
449 | target, user); | |
450 | if (!ret) { | |
451 | lr->function = result.function; | |
452 | lr->file = result.file; | |
453 | lr->start = result.line; | |
454 | if (lr->end != INT_MAX) | |
455 | lr->end = lr->start + len; | |
456 | clear_perf_probe_point(&pp); | |
457 | } | |
458 | return ret; | |
459 | } | |
460 | ||
ff741783 | 461 | /* Open new debuginfo of given module */ |
92561cb7 | 462 | static struct debuginfo *open_debuginfo(const char *module, bool silent) |
e0faa8d3 | 463 | { |
a15ad2f5 | 464 | const char *path = module; |
419e8738 MH |
465 | char reason[STRERR_BUFSIZE]; |
466 | struct debuginfo *ret = NULL; | |
467 | struct dso *dso = NULL; | |
468 | int err; | |
ff741783 | 469 | |
a15ad2f5 | 470 | if (!module || !strchr(module, '/')) { |
419e8738 MH |
471 | err = kernel_get_module_dso(module, &dso); |
472 | if (err < 0) { | |
473 | if (!dso || dso->load_errno == 0) { | |
474 | if (!strerror_r(-err, reason, STRERR_BUFSIZE)) | |
475 | strcpy(reason, "(unknown)"); | |
476 | } else | |
477 | dso__strerror_load(dso, reason, STRERR_BUFSIZE); | |
92561cb7 | 478 | if (!silent) |
419e8738 MH |
479 | pr_err("Failed to find the path for %s: %s\n", |
480 | module ?: "kernel", reason); | |
14a8fd7c MH |
481 | return NULL; |
482 | } | |
419e8738 | 483 | path = dso->long_name; |
e0faa8d3 | 484 | } |
92561cb7 MH |
485 | ret = debuginfo__new(path); |
486 | if (!ret && !silent) { | |
487 | pr_warning("The %s file has no debug information.\n", path); | |
488 | if (!module || !strtailcmp(path, ".ko")) | |
489 | pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); | |
490 | else | |
491 | pr_warning("Rebuild with -g, "); | |
492 | pr_warning("or install an appropriate debuginfo package.\n"); | |
493 | } | |
494 | return ret; | |
e0faa8d3 | 495 | } |
4b4da7f7 | 496 | |
7737af01 MH |
497 | /* For caching the last debuginfo */ |
498 | static struct debuginfo *debuginfo_cache; | |
499 | static char *debuginfo_cache_path; | |
500 | ||
501 | static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) | |
502 | { | |
20f49859 MH |
503 | const char *path = module; |
504 | ||
505 | /* If the module is NULL, it should be the kernel. */ | |
506 | if (!module) | |
507 | path = "kernel"; | |
508 | ||
509 | if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) | |
7737af01 MH |
510 | goto out; |
511 | ||
512 | /* Copy module path */ | |
513 | free(debuginfo_cache_path); | |
20f49859 MH |
514 | debuginfo_cache_path = strdup(path); |
515 | if (!debuginfo_cache_path) { | |
516 | debuginfo__delete(debuginfo_cache); | |
517 | debuginfo_cache = NULL; | |
518 | goto out; | |
7737af01 MH |
519 | } |
520 | ||
521 | debuginfo_cache = open_debuginfo(module, silent); | |
522 | if (!debuginfo_cache) | |
523 | zfree(&debuginfo_cache_path); | |
524 | out: | |
525 | return debuginfo_cache; | |
526 | } | |
527 | ||
528 | static void debuginfo_cache__exit(void) | |
529 | { | |
530 | debuginfo__delete(debuginfo_cache); | |
531 | debuginfo_cache = NULL; | |
532 | zfree(&debuginfo_cache_path); | |
533 | } | |
534 | ||
92561cb7 | 535 | |
99ca4233 MH |
536 | static int get_text_start_address(const char *exec, unsigned long *address) |
537 | { | |
538 | Elf *elf; | |
539 | GElf_Ehdr ehdr; | |
540 | GElf_Shdr shdr; | |
541 | int fd, ret = -ENOENT; | |
542 | ||
543 | fd = open(exec, O_RDONLY); | |
544 | if (fd < 0) | |
545 | return -errno; | |
546 | ||
547 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
062d6c2a MH |
548 | if (elf == NULL) { |
549 | ret = -EINVAL; | |
550 | goto out_close; | |
551 | } | |
99ca4233 MH |
552 | |
553 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
554 | goto out; | |
555 | ||
556 | if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) | |
557 | goto out; | |
558 | ||
559 | *address = shdr.sh_addr - shdr.sh_offset; | |
560 | ret = 0; | |
561 | out: | |
562 | elf_end(elf); | |
062d6c2a MH |
563 | out_close: |
564 | close(fd); | |
565 | ||
99ca4233 MH |
566 | return ret; |
567 | } | |
568 | ||
5a6f6314 MH |
569 | /* |
570 | * Convert trace point to probe point with debuginfo | |
571 | */ | |
572 | static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, | |
573 | struct perf_probe_point *pp, | |
574 | bool is_kprobe) | |
575 | { | |
576 | struct debuginfo *dinfo = NULL; | |
577 | unsigned long stext = 0; | |
578 | u64 addr = tp->address; | |
579 | int ret = -ENOENT; | |
580 | ||
581 | /* convert the address to dwarf address */ | |
582 | if (!is_kprobe) { | |
583 | if (!addr) { | |
584 | ret = -EINVAL; | |
585 | goto error; | |
586 | } | |
587 | ret = get_text_start_address(tp->module, &stext); | |
588 | if (ret < 0) | |
589 | goto error; | |
590 | addr += stext; | |
e486367f | 591 | } else if (tp->symbol) { |
9b239a12 MH |
592 | /* If the module is given, this returns relative address */ |
593 | ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, | |
594 | false, !!tp->module); | |
595 | if (ret != 0) | |
5a6f6314 MH |
596 | goto error; |
597 | addr += tp->offset; | |
598 | } | |
599 | ||
600 | pr_debug("try to find information at %" PRIx64 " in %s\n", addr, | |
601 | tp->module ? : "kernel"); | |
602 | ||
7737af01 MH |
603 | dinfo = debuginfo_cache__open(tp->module, verbose == 0); |
604 | if (dinfo) | |
5a6f6314 MH |
605 | ret = debuginfo__find_probe_point(dinfo, |
606 | (unsigned long)addr, pp); | |
7737af01 | 607 | else |
5a6f6314 | 608 | ret = -ENOENT; |
5a6f6314 MH |
609 | |
610 | if (ret > 0) { | |
611 | pp->retprobe = tp->retprobe; | |
612 | return 0; | |
613 | } | |
614 | error: | |
615 | pr_debug("Failed to find corresponding probes from debuginfo.\n"); | |
616 | return ret ? : -ENOENT; | |
617 | } | |
618 | ||
fb7345bb MH |
619 | static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, |
620 | int ntevs, const char *exec) | |
621 | { | |
622 | int i, ret = 0; | |
eb948e50 | 623 | unsigned long stext = 0; |
fb7345bb MH |
624 | |
625 | if (!exec) | |
626 | return 0; | |
627 | ||
628 | ret = get_text_start_address(exec, &stext); | |
629 | if (ret < 0) | |
630 | return ret; | |
631 | ||
632 | for (i = 0; i < ntevs && ret >= 0; i++) { | |
981a2379 | 633 | /* point.address is the addres of point.symbol + point.offset */ |
eb948e50 | 634 | tevs[i].point.address -= stext; |
fb7345bb | 635 | tevs[i].point.module = strdup(exec); |
eb948e50 | 636 | if (!tevs[i].point.module) { |
fb7345bb MH |
637 | ret = -ENOMEM; |
638 | break; | |
639 | } | |
640 | tevs[i].uprobes = true; | |
641 | } | |
642 | ||
643 | return ret; | |
644 | } | |
645 | ||
190b57fc MH |
646 | static int add_module_to_probe_trace_events(struct probe_trace_event *tevs, |
647 | int ntevs, const char *module) | |
648 | { | |
14a8fd7c | 649 | int i, ret = 0; |
63a29613 | 650 | char *mod_name = NULL; |
14a8fd7c MH |
651 | |
652 | if (!module) | |
653 | return 0; | |
654 | ||
63a29613 | 655 | mod_name = find_module_name(module); |
14a8fd7c | 656 | |
190b57fc | 657 | for (i = 0; i < ntevs; i++) { |
63a29613 RB |
658 | tevs[i].point.module = |
659 | strdup(mod_name ? mod_name : module); | |
14a8fd7c MH |
660 | if (!tevs[i].point.module) { |
661 | ret = -ENOMEM; | |
662 | break; | |
663 | } | |
190b57fc | 664 | } |
14a8fd7c | 665 | |
63a29613 | 666 | free(mod_name); |
14a8fd7c | 667 | return ret; |
190b57fc MH |
668 | } |
669 | ||
dfef99cd MH |
670 | /* Post processing the probe events */ |
671 | static int post_process_probe_trace_events(struct probe_trace_event *tevs, | |
672 | int ntevs, const char *module, | |
673 | bool uprobe) | |
674 | { | |
675 | struct ref_reloc_sym *reloc_sym; | |
676 | char *tmp; | |
5a51fcd1 | 677 | int i, skipped = 0; |
dfef99cd MH |
678 | |
679 | if (uprobe) | |
680 | return add_exec_to_probe_trace_events(tevs, ntevs, module); | |
681 | ||
682 | /* Note that currently ref_reloc_sym based probe is not for drivers */ | |
683 | if (module) | |
684 | return add_module_to_probe_trace_events(tevs, ntevs, module); | |
685 | ||
8f33f7de | 686 | reloc_sym = kernel_get_ref_reloc_sym(); |
dfef99cd MH |
687 | if (!reloc_sym) { |
688 | pr_warning("Relocated base symbol is not found!\n"); | |
689 | return -EINVAL; | |
690 | } | |
691 | ||
692 | for (i = 0; i < ntevs; i++) { | |
b031220d MH |
693 | if (!tevs[i].point.address || tevs[i].point.retprobe) |
694 | continue; | |
695 | /* If we found a wrong one, mark it by NULL symbol */ | |
696 | if (kprobe_warn_out_range(tevs[i].point.symbol, | |
697 | tevs[i].point.address)) { | |
698 | tmp = NULL; | |
699 | skipped++; | |
700 | } else { | |
701 | tmp = strdup(reloc_sym->name); | |
702 | if (!tmp) | |
703 | return -ENOMEM; | |
dfef99cd | 704 | } |
b031220d MH |
705 | /* If we have no realname, use symbol for it */ |
706 | if (!tevs[i].point.realname) | |
707 | tevs[i].point.realname = tevs[i].point.symbol; | |
708 | else | |
709 | free(tevs[i].point.symbol); | |
710 | tevs[i].point.symbol = tmp; | |
711 | tevs[i].point.offset = tevs[i].point.address - | |
712 | reloc_sym->unrelocated_addr; | |
dfef99cd | 713 | } |
5a51fcd1 | 714 | return skipped; |
dfef99cd MH |
715 | } |
716 | ||
4b4da7f7 | 717 | /* Try to find perf_probe_event with debuginfo */ |
0e60836b | 718 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 719 | struct probe_trace_event **tevs) |
4b4da7f7 MH |
720 | { |
721 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
9b118aca | 722 | struct perf_probe_point tmp; |
225466f1 | 723 | struct debuginfo *dinfo; |
190b57fc | 724 | int ntevs, ret = 0; |
4b4da7f7 | 725 | |
44225521 | 726 | dinfo = open_debuginfo(pev->target, !need_dwarf); |
ff741783 | 727 | if (!dinfo) { |
92561cb7 | 728 | if (need_dwarf) |
ff741783 | 729 | return -ENOENT; |
ff741783 | 730 | pr_debug("Could not open debuginfo. Try to use symbols.\n"); |
4b4da7f7 MH |
731 | return 0; |
732 | } | |
733 | ||
dfef99cd | 734 | pr_debug("Try to find probe point from debuginfo.\n"); |
ff741783 | 735 | /* Searching trace events corresponding to a probe event */ |
ddb2f58f | 736 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
ff741783 | 737 | |
9b118aca | 738 | if (ntevs == 0) { /* Not found, retry with an alternative */ |
44225521 | 739 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca | 740 | if (!ret) { |
ddb2f58f | 741 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
9b118aca MH |
742 | /* |
743 | * Write back to the original probe_event for | |
744 | * setting appropriate (user given) event name | |
745 | */ | |
746 | clear_perf_probe_point(&pev->point); | |
747 | memcpy(&pev->point, &tmp, sizeof(tmp)); | |
748 | } | |
749 | } | |
750 | ||
ff741783 | 751 | debuginfo__delete(dinfo); |
4b4da7f7 | 752 | |
146a1439 | 753 | if (ntevs > 0) { /* Succeeded to find trace events */ |
dfef99cd MH |
754 | pr_debug("Found %d probe_trace_events.\n", ntevs); |
755 | ret = post_process_probe_trace_events(*tevs, ntevs, | |
44225521 | 756 | pev->target, pev->uprobes); |
5a51fcd1 | 757 | if (ret < 0 || ret == ntevs) { |
981d05ad MH |
758 | clear_probe_trace_events(*tevs, ntevs); |
759 | zfree(tevs); | |
760 | } | |
5a51fcd1 MH |
761 | if (ret != ntevs) |
762 | return ret < 0 ? ret : ntevs; | |
763 | ntevs = 0; | |
764 | /* Fall through */ | |
146a1439 | 765 | } |
4b4da7f7 | 766 | |
146a1439 | 767 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
0687eba7 | 768 | pr_warning("Probe point '%s' not found.\n", |
146a1439 | 769 | synthesize_perf_probe_point(&pev->point)); |
0687eba7 | 770 | return -ENOENT; |
146a1439 MH |
771 | } |
772 | /* Error path : ntevs < 0 */ | |
15eca306 | 773 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
1c0bd0e8 WN |
774 | if (ntevs < 0) { |
775 | if (ntevs == -EBADF) | |
776 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
777 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
15eca306 | 778 | if (!need_dwarf) { |
0e43e5d2 | 779 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
780 | return 0; |
781 | } | |
4b4da7f7 | 782 | } |
15eca306 | 783 | return ntevs; |
4b4da7f7 MH |
784 | } |
785 | ||
786 | #define LINEBUF_SIZE 256 | |
787 | #define NR_ADDITIONAL_LINES 2 | |
788 | ||
fde52dbd | 789 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 | 790 | { |
5f03cba4 | 791 | char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; |
befe3414 FBH |
792 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
793 | const char *prefix = NULL; | |
4b4da7f7 | 794 | |
befe3414 | 795 | do { |
4b4da7f7 MH |
796 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
797 | goto error; | |
befe3414 FBH |
798 | if (skip) |
799 | continue; | |
800 | if (!prefix) { | |
801 | prefix = show_num ? "%7d " : " "; | |
802 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 803 | } |
befe3414 FBH |
804 | color_fprintf(stdout, color, "%s", buf); |
805 | ||
806 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 807 | |
fde52dbd | 808 | return 1; |
4b4da7f7 | 809 | error: |
fde52dbd | 810 | if (ferror(fp)) { |
5f03cba4 MH |
811 | pr_warning("File read error: %s\n", |
812 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
fde52dbd FBH |
813 | return -1; |
814 | } | |
815 | return 0; | |
816 | } | |
146a1439 | 817 | |
fde52dbd FBH |
818 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
819 | { | |
820 | int rv = __show_one_line(fp, l, skip, show_num); | |
821 | if (rv == 0) { | |
822 | pr_warning("Source file is shorter than expected.\n"); | |
823 | rv = -1; | |
824 | } | |
825 | return rv; | |
4b4da7f7 MH |
826 | } |
827 | ||
fde52dbd FBH |
828 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
829 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
830 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
831 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
832 | ||
4b4da7f7 MH |
833 | /* |
834 | * Show line-range always requires debuginfo to find source file and | |
835 | * line number. | |
836 | */ | |
811dd2ae MH |
837 | static int __show_line_range(struct line_range *lr, const char *module, |
838 | bool user) | |
4b4da7f7 | 839 | { |
d3b63d7a | 840 | int l = 1; |
5a62257a | 841 | struct int_node *ln; |
ff741783 | 842 | struct debuginfo *dinfo; |
4b4da7f7 | 843 | FILE *fp; |
ff741783 | 844 | int ret; |
7cf0b79e | 845 | char *tmp; |
5f03cba4 | 846 | char sbuf[STRERR_BUFSIZE]; |
4b4da7f7 MH |
847 | |
848 | /* Search a line range */ | |
92561cb7 MH |
849 | dinfo = open_debuginfo(module, false); |
850 | if (!dinfo) | |
ff741783 | 851 | return -ENOENT; |
146a1439 | 852 | |
ff741783 | 853 | ret = debuginfo__find_line_range(dinfo, lr); |
811dd2ae MH |
854 | if (!ret) { /* Not found, retry with an alternative */ |
855 | ret = get_alternative_line_range(dinfo, lr, module, user); | |
856 | if (!ret) | |
857 | ret = debuginfo__find_line_range(dinfo, lr); | |
858 | } | |
ff741783 | 859 | debuginfo__delete(dinfo); |
5ee05b88 | 860 | if (ret == 0 || ret == -ENOENT) { |
146a1439 MH |
861 | pr_warning("Specified source line is not found.\n"); |
862 | return -ENOENT; | |
863 | } else if (ret < 0) { | |
5ee05b88 | 864 | pr_warning("Debuginfo analysis failed.\n"); |
146a1439 MH |
865 | return ret; |
866 | } | |
4b4da7f7 | 867 | |
7cf0b79e MH |
868 | /* Convert source file path */ |
869 | tmp = lr->path; | |
6a330a3c | 870 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
a78604de HK |
871 | |
872 | /* Free old path when new path is assigned */ | |
873 | if (tmp != lr->path) | |
874 | free(tmp); | |
875 | ||
7cf0b79e | 876 | if (ret < 0) { |
5ee05b88 | 877 | pr_warning("Failed to find source file path.\n"); |
7cf0b79e MH |
878 | return ret; |
879 | } | |
880 | ||
4b4da7f7 MH |
881 | setup_pager(); |
882 | ||
883 | if (lr->function) | |
8737ebde | 884 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
4b4da7f7 MH |
885 | lr->start - lr->offset); |
886 | else | |
62c15fc4 | 887 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
888 | |
889 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
890 | if (fp == NULL) { |
891 | pr_warning("Failed to open %s: %s\n", lr->path, | |
5f03cba4 | 892 | strerror_r(errno, sbuf, sizeof(sbuf))); |
146a1439 MH |
893 | return -errno; |
894 | } | |
4b4da7f7 | 895 | /* Skip to starting line number */ |
44b81e92 | 896 | while (l < lr->start) { |
fde52dbd | 897 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
898 | if (ret < 0) |
899 | goto end; | |
900 | } | |
4b4da7f7 | 901 | |
5a62257a MH |
902 | intlist__for_each(ln, lr->line_list) { |
903 | for (; ln->i > l; l++) { | |
fde52dbd | 904 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
905 | if (ret < 0) |
906 | goto end; | |
907 | } | |
fde52dbd | 908 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
909 | if (ret < 0) |
910 | goto end; | |
4b4da7f7 MH |
911 | } |
912 | ||
913 | if (lr->end == INT_MAX) | |
914 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
915 | while (l <= lr->end) { |
916 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
917 | if (ret <= 0) | |
44b81e92 FBH |
918 | break; |
919 | } | |
146a1439 | 920 | end: |
4b4da7f7 | 921 | fclose(fp); |
146a1439 | 922 | return ret; |
4b4da7f7 MH |
923 | } |
924 | ||
2b394bc4 | 925 | int show_line_range(struct line_range *lr, const char *module, bool user) |
ee45b6c2 MH |
926 | { |
927 | int ret; | |
928 | ||
9bae1e8c | 929 | ret = init_probe_symbol_maps(user); |
ee45b6c2 MH |
930 | if (ret < 0) |
931 | return ret; | |
811dd2ae | 932 | ret = __show_line_range(lr, module, user); |
9bae1e8c | 933 | exit_probe_symbol_maps(); |
ee45b6c2 MH |
934 | |
935 | return ret; | |
936 | } | |
937 | ||
ff741783 MH |
938 | static int show_available_vars_at(struct debuginfo *dinfo, |
939 | struct perf_probe_event *pev, | |
ddb2f58f | 940 | struct strfilter *_filter) |
cf6eb489 MH |
941 | { |
942 | char *buf; | |
bd09d7b5 | 943 | int ret, i, nvars; |
cf6eb489 MH |
944 | struct str_node *node; |
945 | struct variable_list *vls = NULL, *vl; | |
9b118aca | 946 | struct perf_probe_point tmp; |
bd09d7b5 | 947 | const char *var; |
cf6eb489 MH |
948 | |
949 | buf = synthesize_perf_probe_point(&pev->point); | |
950 | if (!buf) | |
951 | return -EINVAL; | |
952 | pr_debug("Searching variables at %s\n", buf); | |
953 | ||
ddb2f58f | 954 | ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); |
9b118aca | 955 | if (!ret) { /* Not found, retry with an alternative */ |
44225521 | 956 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca MH |
957 | if (!ret) { |
958 | ret = debuginfo__find_available_vars_at(dinfo, pev, | |
ddb2f58f | 959 | &vls); |
9b118aca MH |
960 | /* Release the old probe_point */ |
961 | clear_perf_probe_point(&tmp); | |
962 | } | |
963 | } | |
bd09d7b5 | 964 | if (ret <= 0) { |
69e96eaa MH |
965 | if (ret == 0 || ret == -ENOENT) { |
966 | pr_err("Failed to find the address of %s\n", buf); | |
967 | ret = -ENOENT; | |
968 | } else | |
969 | pr_warning("Debuginfo analysis failed.\n"); | |
bd09d7b5 MH |
970 | goto end; |
971 | } | |
69e96eaa | 972 | |
bd09d7b5 MH |
973 | /* Some variables are found */ |
974 | fprintf(stdout, "Available variables at %s\n", buf); | |
975 | for (i = 0; i < ret; i++) { | |
976 | vl = &vls[i]; | |
977 | /* | |
978 | * A probe point might be converted to | |
979 | * several trace points. | |
980 | */ | |
981 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
982 | vl->point.offset); | |
74cf249d | 983 | zfree(&vl->point.symbol); |
bd09d7b5 MH |
984 | nvars = 0; |
985 | if (vl->vars) { | |
986 | strlist__for_each(node, vl->vars) { | |
987 | var = strchr(node->s, '\t') + 1; | |
988 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 989 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
990 | nvars++; |
991 | } | |
992 | } | |
993 | strlist__delete(vl->vars); | |
cf6eb489 | 994 | } |
bd09d7b5 MH |
995 | if (nvars == 0) |
996 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
997 | } | |
998 | free(vls); | |
999 | end: | |
cf6eb489 MH |
1000 | free(buf); |
1001 | return ret; | |
1002 | } | |
1003 | ||
1004 | /* Show available variables on given probe point */ | |
1005 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
ddb2f58f | 1006 | struct strfilter *_filter) |
cf6eb489 | 1007 | { |
ff741783 MH |
1008 | int i, ret = 0; |
1009 | struct debuginfo *dinfo; | |
cf6eb489 | 1010 | |
9bae1e8c | 1011 | ret = init_probe_symbol_maps(pevs->uprobes); |
cf6eb489 MH |
1012 | if (ret < 0) |
1013 | return ret; | |
1014 | ||
44225521 | 1015 | dinfo = open_debuginfo(pevs->target, false); |
ff741783 | 1016 | if (!dinfo) { |
ee45b6c2 MH |
1017 | ret = -ENOENT; |
1018 | goto out; | |
ff741783 MH |
1019 | } |
1020 | ||
cf6eb489 MH |
1021 | setup_pager(); |
1022 | ||
ff741783 | 1023 | for (i = 0; i < npevs && ret >= 0; i++) |
ddb2f58f | 1024 | ret = show_available_vars_at(dinfo, &pevs[i], _filter); |
ff741783 MH |
1025 | |
1026 | debuginfo__delete(dinfo); | |
ee45b6c2 | 1027 | out: |
9bae1e8c | 1028 | exit_probe_symbol_maps(); |
cf6eb489 MH |
1029 | return ret; |
1030 | } | |
1031 | ||
89fe808a | 1032 | #else /* !HAVE_DWARF_SUPPORT */ |
4b4da7f7 | 1033 | |
7737af01 MH |
1034 | static void debuginfo_cache__exit(void) |
1035 | { | |
1036 | } | |
1037 | ||
5a6f6314 MH |
1038 | static int |
1039 | find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, | |
1040 | struct perf_probe_point *pp __maybe_unused, | |
1041 | bool is_kprobe __maybe_unused) | |
4b4da7f7 | 1042 | { |
5a6f6314 | 1043 | return -ENOSYS; |
4b4da7f7 MH |
1044 | } |
1045 | ||
0e60836b | 1046 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 1047 | struct probe_trace_event **tevs __maybe_unused) |
4b4da7f7 | 1048 | { |
146a1439 MH |
1049 | if (perf_probe_event_need_dwarf(pev)) { |
1050 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1051 | return -ENOSYS; | |
1052 | } | |
225466f1 | 1053 | |
4b4da7f7 MH |
1054 | return 0; |
1055 | } | |
1056 | ||
1d037ca1 | 1057 | int show_line_range(struct line_range *lr __maybe_unused, |
2b394bc4 MH |
1058 | const char *module __maybe_unused, |
1059 | bool user __maybe_unused) | |
4b4da7f7 | 1060 | { |
146a1439 MH |
1061 | pr_warning("Debuginfo-analysis is not supported.\n"); |
1062 | return -ENOSYS; | |
4b4da7f7 MH |
1063 | } |
1064 | ||
1d037ca1 | 1065 | int show_available_vars(struct perf_probe_event *pevs __maybe_unused, |
ddb2f58f MH |
1066 | int npevs __maybe_unused, |
1067 | struct strfilter *filter __maybe_unused) | |
cf6eb489 MH |
1068 | { |
1069 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1070 | return -ENOSYS; | |
1071 | } | |
e0faa8d3 MH |
1072 | #endif |
1073 | ||
e53b00d3 MH |
1074 | void line_range__clear(struct line_range *lr) |
1075 | { | |
e53b00d3 MH |
1076 | free(lr->function); |
1077 | free(lr->file); | |
1078 | free(lr->path); | |
1079 | free(lr->comp_dir); | |
5a62257a | 1080 | intlist__delete(lr->line_list); |
e53b00d3 MH |
1081 | memset(lr, 0, sizeof(*lr)); |
1082 | } | |
1083 | ||
5a62257a | 1084 | int line_range__init(struct line_range *lr) |
e53b00d3 MH |
1085 | { |
1086 | memset(lr, 0, sizeof(*lr)); | |
5a62257a MH |
1087 | lr->line_list = intlist__new(NULL); |
1088 | if (!lr->line_list) | |
1089 | return -ENOMEM; | |
1090 | else | |
1091 | return 0; | |
e53b00d3 MH |
1092 | } |
1093 | ||
21dd9ae5 FBH |
1094 | static int parse_line_num(char **ptr, int *val, const char *what) |
1095 | { | |
1096 | const char *start = *ptr; | |
1097 | ||
1098 | errno = 0; | |
1099 | *val = strtol(*ptr, ptr, 0); | |
1100 | if (errno || *ptr == start) { | |
1101 | semantic_error("'%s' is not a valid number.\n", what); | |
1102 | return -EINVAL; | |
1103 | } | |
1104 | return 0; | |
1105 | } | |
1106 | ||
573709fd MH |
1107 | /* Check the name is good for event, group or function */ |
1108 | static bool is_c_func_name(const char *name) | |
1109 | { | |
1110 | if (!isalpha(*name) && *name != '_') | |
1111 | return false; | |
1112 | while (*++name != '\0') { | |
1113 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1114 | return false; | |
1115 | } | |
1116 | return true; | |
1117 | } | |
1118 | ||
9d95b580 FBH |
1119 | /* |
1120 | * Stuff 'lr' according to the line range described by 'arg'. | |
1121 | * The line range syntax is described by: | |
1122 | * | |
1123 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 1124 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 1125 | */ |
146a1439 | 1126 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 1127 | { |
e116dfa1 | 1128 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
1129 | int err; |
1130 | ||
1131 | if (!name) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | lr->start = 0; | |
1135 | lr->end = INT_MAX; | |
1136 | ||
1137 | range = strchr(name, ':'); | |
1138 | if (range) { | |
1139 | *range++ = '\0'; | |
1140 | ||
1141 | err = parse_line_num(&range, &lr->start, "start line"); | |
1142 | if (err) | |
1143 | goto err; | |
1144 | ||
1145 | if (*range == '+' || *range == '-') { | |
1146 | const char c = *range++; | |
1147 | ||
1148 | err = parse_line_num(&range, &lr->end, "end line"); | |
1149 | if (err) | |
1150 | goto err; | |
1151 | ||
1152 | if (c == '+') { | |
1153 | lr->end += lr->start; | |
1154 | /* | |
1155 | * Adjust the number of lines here. | |
1156 | * If the number of lines == 1, the | |
1157 | * the end of line should be equal to | |
1158 | * the start of line. | |
1159 | */ | |
1160 | lr->end--; | |
1161 | } | |
1162 | } | |
9d95b580 | 1163 | |
d3b63d7a | 1164 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
1165 | |
1166 | err = -EINVAL; | |
d3b63d7a | 1167 | if (lr->start > lr->end) { |
631c9def | 1168 | semantic_error("Start line must be smaller" |
146a1439 | 1169 | " than end line.\n"); |
21dd9ae5 | 1170 | goto err; |
146a1439 | 1171 | } |
21dd9ae5 FBH |
1172 | if (*range != '\0') { |
1173 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
1174 | goto err; | |
146a1439 | 1175 | } |
d3b63d7a | 1176 | } |
02b95dad | 1177 | |
e116dfa1 MH |
1178 | file = strchr(name, '@'); |
1179 | if (file) { | |
1180 | *file = '\0'; | |
1181 | lr->file = strdup(++file); | |
1182 | if (lr->file == NULL) { | |
1183 | err = -ENOMEM; | |
1184 | goto err; | |
1185 | } | |
1186 | lr->function = name; | |
573709fd | 1187 | } else if (strchr(name, '/') || strchr(name, '.')) |
21dd9ae5 | 1188 | lr->file = name; |
573709fd | 1189 | else if (is_c_func_name(name))/* We reuse it for checking funcname */ |
21dd9ae5 | 1190 | lr->function = name; |
573709fd MH |
1191 | else { /* Invalid name */ |
1192 | semantic_error("'%s' is not a valid function name.\n", name); | |
1193 | err = -EINVAL; | |
1194 | goto err; | |
1195 | } | |
146a1439 MH |
1196 | |
1197 | return 0; | |
21dd9ae5 FBH |
1198 | err: |
1199 | free(name); | |
1200 | return err; | |
631c9def MH |
1201 | } |
1202 | ||
50656eec | 1203 | /* Parse probepoint definition. */ |
146a1439 | 1204 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 1205 | { |
4235b045 | 1206 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
1207 | char *ptr, *tmp; |
1208 | char c, nc = 0; | |
3099c026 | 1209 | bool file_spec = false; |
50656eec MH |
1210 | /* |
1211 | * <Syntax> | |
2a9c8c36 MH |
1212 | * perf probe [EVENT=]SRC[:LN|;PTN] |
1213 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
1214 | * |
1215 | * TODO:Group name support | |
50656eec | 1216 | */ |
e59d29e8 WN |
1217 | if (!arg) |
1218 | return -EINVAL; | |
50656eec | 1219 | |
2a9c8c36 MH |
1220 | ptr = strpbrk(arg, ";=@+%"); |
1221 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
1222 | *ptr = '\0'; |
1223 | tmp = ptr + 1; | |
146a1439 MH |
1224 | if (strchr(arg, ':')) { |
1225 | semantic_error("Group name is not supported yet.\n"); | |
1226 | return -ENOTSUP; | |
1227 | } | |
573709fd | 1228 | if (!is_c_func_name(arg)) { |
b7702a21 | 1229 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
1230 | "follow C symbol-naming rule.\n", arg); |
1231 | return -EINVAL; | |
1232 | } | |
02b95dad MH |
1233 | pev->event = strdup(arg); |
1234 | if (pev->event == NULL) | |
1235 | return -ENOMEM; | |
4235b045 | 1236 | pev->group = NULL; |
af663d75 MH |
1237 | arg = tmp; |
1238 | } | |
1239 | ||
3099c026 NR |
1240 | /* |
1241 | * Check arg is function or file name and copy it. | |
1242 | * | |
1243 | * We consider arg to be a file spec if and only if it satisfies | |
1244 | * all of the below criteria:: | |
1245 | * - it does not include any of "+@%", | |
1246 | * - it includes one of ":;", and | |
1247 | * - it has a period '.' in the name. | |
1248 | * | |
1249 | * Otherwise, we consider arg to be a function specification. | |
1250 | */ | |
1251 | if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) { | |
1252 | /* This is a file spec if it includes a '.' before ; or : */ | |
1253 | if (memchr(arg, '.', ptr - arg)) | |
1254 | file_spec = true; | |
1255 | } | |
1256 | ||
2a9c8c36 | 1257 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
1258 | if (ptr) { |
1259 | nc = *ptr; | |
1260 | *ptr++ = '\0'; | |
1261 | } | |
1262 | ||
6c6e024f WN |
1263 | if (arg[0] == '\0') |
1264 | tmp = NULL; | |
1265 | else { | |
1266 | tmp = strdup(arg); | |
1267 | if (tmp == NULL) | |
1268 | return -ENOMEM; | |
1269 | } | |
02b95dad | 1270 | |
3099c026 | 1271 | if (file_spec) |
02b95dad | 1272 | pp->file = tmp; |
da15bd9d | 1273 | else { |
02b95dad | 1274 | pp->function = tmp; |
50656eec | 1275 | |
da15bd9d WN |
1276 | /* |
1277 | * Keep pp->function even if this is absolute address, | |
1278 | * so it can mark whether abs_address is valid. | |
1279 | * Which make 'perf probe lib.bin 0x0' possible. | |
1280 | * | |
1281 | * Note that checking length of tmp is not needed | |
1282 | * because when we access tmp[1] we know tmp[0] is '0', | |
1283 | * so tmp[1] should always valid (but could be '\0'). | |
1284 | */ | |
1285 | if (tmp && !strncmp(tmp, "0x", 2)) { | |
1286 | pp->abs_address = strtoul(pp->function, &tmp, 0); | |
1287 | if (*tmp != '\0') { | |
1288 | semantic_error("Invalid absolute address.\n"); | |
1289 | return -EINVAL; | |
1290 | } | |
1291 | } | |
1292 | } | |
1293 | ||
50656eec MH |
1294 | /* Parse other options */ |
1295 | while (ptr) { | |
1296 | arg = ptr; | |
1297 | c = nc; | |
2a9c8c36 | 1298 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
1299 | pp->lazy_line = strdup(arg); |
1300 | if (pp->lazy_line == NULL) | |
1301 | return -ENOMEM; | |
2a9c8c36 MH |
1302 | break; |
1303 | } | |
1304 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
1305 | if (ptr) { |
1306 | nc = *ptr; | |
1307 | *ptr++ = '\0'; | |
1308 | } | |
1309 | switch (c) { | |
1310 | case ':': /* Line number */ | |
1311 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 1312 | if (*tmp != '\0') { |
2a9c8c36 | 1313 | semantic_error("There is non-digit char" |
146a1439 MH |
1314 | " in line number.\n"); |
1315 | return -EINVAL; | |
1316 | } | |
50656eec MH |
1317 | break; |
1318 | case '+': /* Byte offset from a symbol */ | |
1319 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 1320 | if (*tmp != '\0') { |
2a9c8c36 | 1321 | semantic_error("There is non-digit character" |
146a1439 MH |
1322 | " in offset.\n"); |
1323 | return -EINVAL; | |
1324 | } | |
50656eec MH |
1325 | break; |
1326 | case '@': /* File name */ | |
146a1439 MH |
1327 | if (pp->file) { |
1328 | semantic_error("SRC@SRC is not allowed.\n"); | |
1329 | return -EINVAL; | |
1330 | } | |
02b95dad MH |
1331 | pp->file = strdup(arg); |
1332 | if (pp->file == NULL) | |
1333 | return -ENOMEM; | |
50656eec MH |
1334 | break; |
1335 | case '%': /* Probe places */ | |
1336 | if (strcmp(arg, "return") == 0) { | |
1337 | pp->retprobe = 1; | |
146a1439 MH |
1338 | } else { /* Others not supported yet */ |
1339 | semantic_error("%%%s is not supported.\n", arg); | |
1340 | return -ENOTSUP; | |
1341 | } | |
50656eec | 1342 | break; |
146a1439 MH |
1343 | default: /* Buggy case */ |
1344 | pr_err("This program has a bug at %s:%d.\n", | |
1345 | __FILE__, __LINE__); | |
1346 | return -ENOTSUP; | |
50656eec MH |
1347 | break; |
1348 | } | |
1349 | } | |
1350 | ||
1351 | /* Exclusion check */ | |
146a1439 | 1352 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
1353 | semantic_error("Lazy pattern can't be used with" |
1354 | " line number.\n"); | |
146a1439 MH |
1355 | return -EINVAL; |
1356 | } | |
2a9c8c36 | 1357 | |
146a1439 | 1358 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 1359 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
1360 | return -EINVAL; |
1361 | } | |
2a9c8c36 | 1362 | |
146a1439 | 1363 | if (pp->line && pp->offset) { |
0e43e5d2 | 1364 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
1365 | return -EINVAL; |
1366 | } | |
50656eec | 1367 | |
146a1439 | 1368 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 1369 | semantic_error("File always requires line number or " |
0e43e5d2 | 1370 | "lazy pattern.\n"); |
146a1439 MH |
1371 | return -EINVAL; |
1372 | } | |
50656eec | 1373 | |
146a1439 | 1374 | if (pp->offset && !pp->function) { |
0e43e5d2 | 1375 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
1376 | return -EINVAL; |
1377 | } | |
50656eec | 1378 | |
146a1439 | 1379 | if (pp->retprobe && !pp->function) { |
0e43e5d2 | 1380 | semantic_error("Return probe requires an entry function.\n"); |
146a1439 MH |
1381 | return -EINVAL; |
1382 | } | |
50656eec | 1383 | |
146a1439 | 1384 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 1385 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 1386 | "return probe.\n"); |
146a1439 MH |
1387 | return -EINVAL; |
1388 | } | |
50656eec | 1389 | |
4235b045 | 1390 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
1391 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
1392 | pp->lazy_line); | |
146a1439 | 1393 | return 0; |
50656eec MH |
1394 | } |
1395 | ||
7df2f329 | 1396 | /* Parse perf-probe event argument */ |
146a1439 | 1397 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 1398 | { |
b2a3c12b | 1399 | char *tmp, *goodname; |
7df2f329 MH |
1400 | struct perf_probe_arg_field **fieldp; |
1401 | ||
1402 | pr_debug("parsing arg: %s into ", str); | |
1403 | ||
48481938 MH |
1404 | tmp = strchr(str, '='); |
1405 | if (tmp) { | |
02b95dad MH |
1406 | arg->name = strndup(str, tmp - str); |
1407 | if (arg->name == NULL) | |
1408 | return -ENOMEM; | |
11a1ca35 | 1409 | pr_debug("name:%s ", arg->name); |
48481938 MH |
1410 | str = tmp + 1; |
1411 | } | |
1412 | ||
11a1ca35 MH |
1413 | tmp = strchr(str, ':'); |
1414 | if (tmp) { /* Type setting */ | |
1415 | *tmp = '\0'; | |
02b95dad MH |
1416 | arg->type = strdup(tmp + 1); |
1417 | if (arg->type == NULL) | |
1418 | return -ENOMEM; | |
11a1ca35 MH |
1419 | pr_debug("type:%s ", arg->type); |
1420 | } | |
1421 | ||
b2a3c12b | 1422 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
1423 | if (!is_c_varname(str) || !tmp) { |
1424 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
1425 | arg->var = strdup(str); |
1426 | if (arg->var == NULL) | |
1427 | return -ENOMEM; | |
48481938 | 1428 | pr_debug("%s\n", arg->var); |
146a1439 | 1429 | return 0; |
7df2f329 MH |
1430 | } |
1431 | ||
b2a3c12b | 1432 | /* Structure fields or array element */ |
02b95dad MH |
1433 | arg->var = strndup(str, tmp - str); |
1434 | if (arg->var == NULL) | |
1435 | return -ENOMEM; | |
b2a3c12b | 1436 | goodname = arg->var; |
48481938 | 1437 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
1438 | fieldp = &arg->field; |
1439 | ||
1440 | do { | |
e334016f MH |
1441 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
1442 | if (*fieldp == NULL) | |
1443 | return -ENOMEM; | |
b2a3c12b MH |
1444 | if (*tmp == '[') { /* Array */ |
1445 | str = tmp; | |
1446 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 1447 | (*fieldp)->ref = true; |
b2a3c12b MH |
1448 | if (*tmp != ']' || tmp == str + 1) { |
1449 | semantic_error("Array index must be a" | |
1450 | " number.\n"); | |
1451 | return -EINVAL; | |
1452 | } | |
1453 | tmp++; | |
1454 | if (*tmp == '\0') | |
1455 | tmp = NULL; | |
1456 | } else { /* Structure */ | |
1457 | if (*tmp == '.') { | |
1458 | str = tmp + 1; | |
1459 | (*fieldp)->ref = false; | |
1460 | } else if (tmp[1] == '>') { | |
1461 | str = tmp + 2; | |
1462 | (*fieldp)->ref = true; | |
1463 | } else { | |
1464 | semantic_error("Argument parse error: %s\n", | |
1465 | str); | |
1466 | return -EINVAL; | |
1467 | } | |
1468 | tmp = strpbrk(str, "-.["); | |
146a1439 | 1469 | } |
7df2f329 | 1470 | if (tmp) { |
02b95dad MH |
1471 | (*fieldp)->name = strndup(str, tmp - str); |
1472 | if ((*fieldp)->name == NULL) | |
1473 | return -ENOMEM; | |
b2a3c12b MH |
1474 | if (*str != '[') |
1475 | goodname = (*fieldp)->name; | |
7df2f329 MH |
1476 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
1477 | fieldp = &(*fieldp)->next; | |
1478 | } | |
1479 | } while (tmp); | |
02b95dad MH |
1480 | (*fieldp)->name = strdup(str); |
1481 | if ((*fieldp)->name == NULL) | |
1482 | return -ENOMEM; | |
b2a3c12b MH |
1483 | if (*str != '[') |
1484 | goodname = (*fieldp)->name; | |
7df2f329 | 1485 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 1486 | |
b2a3c12b | 1487 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 1488 | if (!arg->name) { |
b2a3c12b | 1489 | arg->name = strdup(goodname); |
02b95dad MH |
1490 | if (arg->name == NULL) |
1491 | return -ENOMEM; | |
1492 | } | |
146a1439 | 1493 | return 0; |
7df2f329 MH |
1494 | } |
1495 | ||
4235b045 | 1496 | /* Parse perf-probe event command */ |
146a1439 | 1497 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 1498 | { |
e1c01d61 | 1499 | char **argv; |
146a1439 | 1500 | int argc, i, ret = 0; |
fac13fd5 | 1501 | |
4235b045 | 1502 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1503 | if (!argv) { |
1504 | pr_debug("Failed to split arguments.\n"); | |
1505 | return -ENOMEM; | |
1506 | } | |
1507 | if (argc - 1 > MAX_PROBE_ARGS) { | |
1508 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
1509 | ret = -ERANGE; | |
1510 | goto out; | |
1511 | } | |
50656eec | 1512 | /* Parse probe point */ |
146a1439 MH |
1513 | ret = parse_perf_probe_point(argv[0], pev); |
1514 | if (ret < 0) | |
1515 | goto out; | |
50656eec | 1516 | |
e1c01d61 | 1517 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 1518 | pev->nargs = argc - 1; |
e334016f MH |
1519 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1520 | if (pev->args == NULL) { | |
1521 | ret = -ENOMEM; | |
1522 | goto out; | |
1523 | } | |
146a1439 MH |
1524 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
1525 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
1526 | if (ret >= 0 && | |
1527 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 1528 | semantic_error("You can't specify local variable for" |
146a1439 MH |
1529 | " kretprobe.\n"); |
1530 | ret = -EINVAL; | |
1531 | } | |
e1c01d61 | 1532 | } |
146a1439 | 1533 | out: |
e1c01d61 | 1534 | argv_free(argv); |
146a1439 MH |
1535 | |
1536 | return ret; | |
50656eec MH |
1537 | } |
1538 | ||
4235b045 MH |
1539 | /* Return true if this perf_probe_event requires debuginfo */ |
1540 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
1541 | { | |
1542 | int i; | |
1543 | ||
1544 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
1545 | return true; | |
1546 | ||
1547 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 1548 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
1549 | return true; |
1550 | ||
1551 | return false; | |
1552 | } | |
1553 | ||
0e60836b | 1554 | /* Parse probe_events event into struct probe_point */ |
92f6c72e | 1555 | int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) |
4de189fe | 1556 | { |
0e60836b | 1557 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
1558 | char pr; |
1559 | char *p; | |
bcbd0040 | 1560 | char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; |
4de189fe MH |
1561 | int ret, i, argc; |
1562 | char **argv; | |
1563 | ||
0e60836b | 1564 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1565 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1566 | if (!argv) { |
1567 | pr_debug("Failed to split arguments.\n"); | |
1568 | return -ENOMEM; | |
1569 | } | |
1570 | if (argc < 2) { | |
1571 | semantic_error("Too few probe arguments.\n"); | |
1572 | ret = -ERANGE; | |
1573 | goto out; | |
1574 | } | |
4de189fe MH |
1575 | |
1576 | /* Scan event and group name. */ | |
bcbd0040 IT |
1577 | argv0_str = strdup(argv[0]); |
1578 | if (argv0_str == NULL) { | |
1579 | ret = -ENOMEM; | |
1580 | goto out; | |
1581 | } | |
1582 | fmt1_str = strtok_r(argv0_str, ":", &fmt); | |
1583 | fmt2_str = strtok_r(NULL, "/", &fmt); | |
1584 | fmt3_str = strtok_r(NULL, " \t", &fmt); | |
1585 | if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL | |
1586 | || fmt3_str == NULL) { | |
146a1439 MH |
1587 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1588 | ret = -EINVAL; | |
1589 | goto out; | |
1590 | } | |
bcbd0040 IT |
1591 | pr = fmt1_str[0]; |
1592 | tev->group = strdup(fmt2_str); | |
1593 | tev->event = strdup(fmt3_str); | |
1594 | if (tev->group == NULL || tev->event == NULL) { | |
1595 | ret = -ENOMEM; | |
1596 | goto out; | |
1597 | } | |
4235b045 | 1598 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1599 | |
4235b045 | 1600 | tp->retprobe = (pr == 'r'); |
4de189fe | 1601 | |
190b57fc MH |
1602 | /* Scan module name(if there), function name and offset */ |
1603 | p = strchr(argv[1], ':'); | |
1604 | if (p) { | |
1605 | tp->module = strndup(argv[1], p - argv[1]); | |
1606 | p++; | |
1607 | } else | |
1608 | p = argv[1]; | |
bcbd0040 | 1609 | fmt1_str = strtok_r(p, "+", &fmt); |
be07afe9 WN |
1610 | /* only the address started with 0x */ |
1611 | if (fmt1_str[0] == '0') { | |
1612 | /* | |
1613 | * Fix a special case: | |
1614 | * if address == 0, kernel reports something like: | |
1615 | * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax | |
1616 | * Newer kernel may fix that, but we want to | |
1617 | * support old kernel also. | |
1618 | */ | |
1619 | if (strcmp(fmt1_str, "0x") == 0) { | |
1620 | if (!argv[2] || strcmp(argv[2], "(null)")) { | |
1621 | ret = -EINVAL; | |
1622 | goto out; | |
1623 | } | |
1624 | tp->address = 0; | |
1625 | ||
1626 | free(argv[2]); | |
1627 | for (i = 2; argv[i + 1] != NULL; i++) | |
1628 | argv[i] = argv[i + 1]; | |
1629 | ||
1630 | argv[i] = NULL; | |
1631 | argc -= 1; | |
1632 | } else | |
1633 | tp->address = strtoul(fmt1_str, NULL, 0); | |
1634 | } else { | |
5a6f6314 MH |
1635 | /* Only the symbol-based probe has offset */ |
1636 | tp->symbol = strdup(fmt1_str); | |
1637 | if (tp->symbol == NULL) { | |
1638 | ret = -ENOMEM; | |
1639 | goto out; | |
1640 | } | |
1641 | fmt2_str = strtok_r(NULL, "", &fmt); | |
1642 | if (fmt2_str == NULL) | |
1643 | tp->offset = 0; | |
1644 | else | |
1645 | tp->offset = strtoul(fmt2_str, NULL, 10); | |
bcbd0040 | 1646 | } |
4de189fe | 1647 | |
4235b045 | 1648 | tev->nargs = argc - 2; |
0e60836b | 1649 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1650 | if (tev->args == NULL) { |
1651 | ret = -ENOMEM; | |
1652 | goto out; | |
1653 | } | |
4235b045 | 1654 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1655 | p = strchr(argv[i + 2], '='); |
1656 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1657 | *p++ = '\0'; |
1658 | else | |
1659 | p = argv[i + 2]; | |
02b95dad | 1660 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1661 | /* TODO: parse regs and offset */ |
02b95dad MH |
1662 | tev->args[i].value = strdup(p); |
1663 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1664 | ret = -ENOMEM; | |
1665 | goto out; | |
1666 | } | |
4de189fe | 1667 | } |
146a1439 MH |
1668 | ret = 0; |
1669 | out: | |
bcbd0040 | 1670 | free(argv0_str); |
4de189fe | 1671 | argv_free(argv); |
146a1439 | 1672 | return ret; |
4de189fe MH |
1673 | } |
1674 | ||
7df2f329 | 1675 | /* Compose only probe arg */ |
909b0360 | 1676 | char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) |
7df2f329 MH |
1677 | { |
1678 | struct perf_probe_arg_field *field = pa->field; | |
909b0360 MH |
1679 | struct strbuf buf; |
1680 | char *ret; | |
7df2f329 | 1681 | |
909b0360 | 1682 | strbuf_init(&buf, 64); |
48481938 | 1683 | if (pa->name && pa->var) |
909b0360 | 1684 | strbuf_addf(&buf, "%s=%s", pa->name, pa->var); |
48481938 | 1685 | else |
909b0360 | 1686 | strbuf_addstr(&buf, pa->name ?: pa->var); |
7df2f329 MH |
1687 | |
1688 | while (field) { | |
b2a3c12b | 1689 | if (field->name[0] == '[') |
909b0360 | 1690 | strbuf_addstr(&buf, field->name); |
b2a3c12b | 1691 | else |
909b0360 MH |
1692 | strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", |
1693 | field->name); | |
7df2f329 MH |
1694 | field = field->next; |
1695 | } | |
11a1ca35 | 1696 | |
909b0360 MH |
1697 | if (pa->type) |
1698 | strbuf_addf(&buf, ":%s", pa->type); | |
1699 | ||
1700 | ret = strbuf_detach(&buf, NULL); | |
11a1ca35 | 1701 | |
146a1439 | 1702 | return ret; |
7df2f329 MH |
1703 | } |
1704 | ||
4235b045 MH |
1705 | /* Compose only probe point (not argument) */ |
1706 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 1707 | { |
909b0360 MH |
1708 | struct strbuf buf; |
1709 | char *tmp; | |
1710 | int len; | |
1711 | ||
1712 | strbuf_init(&buf, 64); | |
1713 | if (pp->function) { | |
1714 | strbuf_addstr(&buf, pp->function); | |
1715 | if (pp->offset) | |
1716 | strbuf_addf(&buf, "+%lu", pp->offset); | |
1717 | else if (pp->line) | |
1718 | strbuf_addf(&buf, ":%d", pp->line); | |
1719 | else if (pp->retprobe) | |
1720 | strbuf_addstr(&buf, "%return"); | |
fb1587d8 MH |
1721 | } |
1722 | if (pp->file) { | |
32ae2ade FBH |
1723 | tmp = pp->file; |
1724 | len = strlen(tmp); | |
1725 | if (len > 30) { | |
1726 | tmp = strchr(pp->file + len - 30, '/'); | |
1727 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1728 | } | |
909b0360 MH |
1729 | strbuf_addf(&buf, "@%s", tmp); |
1730 | if (!pp->function && pp->line) | |
1731 | strbuf_addf(&buf, ":%d", pp->line); | |
4de189fe MH |
1732 | } |
1733 | ||
909b0360 | 1734 | return strbuf_detach(&buf, NULL); |
7ef17aaf MH |
1735 | } |
1736 | ||
4235b045 MH |
1737 | #if 0 |
1738 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
1739 | { |
1740 | char *buf; | |
1741 | int i, len, ret; | |
1742 | ||
4235b045 MH |
1743 | buf = synthesize_perf_probe_point(&pev->point); |
1744 | if (!buf) | |
1745 | return NULL; | |
4de189fe | 1746 | |
4235b045 MH |
1747 | len = strlen(buf); |
1748 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 1749 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
1750 | pev->args[i].name); |
1751 | if (ret <= 0) { | |
1752 | free(buf); | |
1753 | return NULL; | |
1754 | } | |
4de189fe MH |
1755 | len += ret; |
1756 | } | |
4de189fe | 1757 | |
4235b045 MH |
1758 | return buf; |
1759 | } | |
1760 | #endif | |
1761 | ||
0e60836b | 1762 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
909b0360 | 1763 | struct strbuf *buf, int depth) |
4235b045 | 1764 | { |
4235b045 | 1765 | if (ref->next) { |
0e60836b | 1766 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
909b0360 | 1767 | depth + 1); |
4235b045 MH |
1768 | if (depth < 0) |
1769 | goto out; | |
1770 | } | |
909b0360 | 1771 | strbuf_addf(buf, "%+ld(", ref->offset); |
4235b045 MH |
1772 | out: |
1773 | return depth; | |
4de189fe MH |
1774 | } |
1775 | ||
0e60836b | 1776 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
909b0360 | 1777 | struct strbuf *buf) |
50656eec | 1778 | { |
0e60836b | 1779 | struct probe_trace_arg_ref *ref = arg->ref; |
909b0360 | 1780 | int depth = 0; |
4235b045 MH |
1781 | |
1782 | /* Argument name or separator */ | |
1783 | if (arg->name) | |
909b0360 | 1784 | strbuf_addf(buf, " %s=", arg->name); |
4235b045 | 1785 | else |
909b0360 | 1786 | strbuf_addch(buf, ' '); |
4235b045 | 1787 | |
b7dcb857 MH |
1788 | /* Special case: @XXX */ |
1789 | if (arg->value[0] == '@' && arg->ref) | |
1790 | ref = ref->next; | |
1791 | ||
4235b045 | 1792 | /* Dereferencing arguments */ |
b7dcb857 | 1793 | if (ref) { |
909b0360 | 1794 | depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); |
4235b045 MH |
1795 | if (depth < 0) |
1796 | return depth; | |
1797 | } | |
1798 | ||
1799 | /* Print argument value */ | |
b7dcb857 | 1800 | if (arg->value[0] == '@' && arg->ref) |
909b0360 | 1801 | strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); |
b7dcb857 | 1802 | else |
909b0360 | 1803 | strbuf_addstr(buf, arg->value); |
4235b045 MH |
1804 | |
1805 | /* Closing */ | |
909b0360 MH |
1806 | while (depth--) |
1807 | strbuf_addch(buf, ')'); | |
4984912e | 1808 | /* Print argument type */ |
909b0360 MH |
1809 | if (arg->type) |
1810 | strbuf_addf(buf, ":%s", arg->type); | |
4235b045 | 1811 | |
909b0360 | 1812 | return 0; |
4235b045 MH |
1813 | } |
1814 | ||
0e60836b | 1815 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1816 | { |
0e60836b | 1817 | struct probe_trace_point *tp = &tev->point; |
909b0360 MH |
1818 | struct strbuf buf; |
1819 | char *ret = NULL; | |
1820 | int i; | |
eb948e50 | 1821 | |
da15bd9d WN |
1822 | /* Uprobes must have tp->module */ |
1823 | if (tev->uprobes && !tp->module) | |
909b0360 MH |
1824 | return NULL; |
1825 | ||
1826 | strbuf_init(&buf, 32); | |
1827 | strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', | |
1828 | tev->group, tev->event); | |
da15bd9d WN |
1829 | /* |
1830 | * If tp->address == 0, then this point must be a | |
1831 | * absolute address uprobe. | |
1832 | * try_to_find_absolute_address() should have made | |
1833 | * tp->symbol to "0x0". | |
1834 | */ | |
1835 | if (tev->uprobes && !tp->address) { | |
1836 | if (!tp->symbol || strcmp(tp->symbol, "0x0")) | |
1837 | goto error; | |
1838 | } | |
eb948e50 MH |
1839 | |
1840 | /* Use the tp->address for uprobes */ | |
225466f1 | 1841 | if (tev->uprobes) |
909b0360 | 1842 | strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address); |
da15bd9d WN |
1843 | else if (!strncmp(tp->symbol, "0x", 2)) |
1844 | /* Absolute address. See try_to_find_absolute_address() */ | |
909b0360 MH |
1845 | strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", |
1846 | tp->module ? ":" : "", tp->address); | |
225466f1 | 1847 | else |
909b0360 MH |
1848 | strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", |
1849 | tp->module ? ":" : "", tp->symbol, tp->offset); | |
50656eec | 1850 | |
909b0360 MH |
1851 | for (i = 0; i < tev->nargs; i++) |
1852 | if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) | |
50656eec | 1853 | goto error; |
50656eec | 1854 | |
909b0360 | 1855 | ret = strbuf_detach(&buf, NULL); |
50656eec | 1856 | error: |
909b0360 MH |
1857 | strbuf_release(&buf); |
1858 | return ret; | |
4235b045 | 1859 | } |
50656eec | 1860 | |
5a6f6314 MH |
1861 | static int find_perf_probe_point_from_map(struct probe_trace_point *tp, |
1862 | struct perf_probe_point *pp, | |
1863 | bool is_kprobe) | |
1864 | { | |
1865 | struct symbol *sym = NULL; | |
1866 | struct map *map; | |
e486367f | 1867 | u64 addr = tp->address; |
5a6f6314 MH |
1868 | int ret = -ENOENT; |
1869 | ||
1870 | if (!is_kprobe) { | |
1871 | map = dso__new_map(tp->module); | |
1872 | if (!map) | |
1873 | goto out; | |
5a6f6314 MH |
1874 | sym = map__find_symbol(map, addr, NULL); |
1875 | } else { | |
9b239a12 | 1876 | if (tp->symbol && !addr) { |
0a62f686 MH |
1877 | if (kernel_get_symbol_address_by_name(tp->symbol, |
1878 | &addr, true, false) < 0) | |
9b239a12 MH |
1879 | goto out; |
1880 | } | |
5a6f6314 MH |
1881 | if (addr) { |
1882 | addr += tp->offset; | |
1883 | sym = __find_kernel_function(addr, &map); | |
1884 | } | |
1885 | } | |
98d3b258 | 1886 | |
5a6f6314 MH |
1887 | if (!sym) |
1888 | goto out; | |
1889 | ||
1890 | pp->retprobe = tp->retprobe; | |
1891 | pp->offset = addr - map->unmap_ip(map, sym->start); | |
1892 | pp->function = strdup(sym->name); | |
1893 | ret = pp->function ? 0 : -ENOMEM; | |
1894 | ||
1895 | out: | |
1896 | if (map && !is_kprobe) { | |
84c2cafa | 1897 | map__put(map); |
5a6f6314 MH |
1898 | } |
1899 | ||
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | static int convert_to_perf_probe_point(struct probe_trace_point *tp, | |
da15bd9d WN |
1904 | struct perf_probe_point *pp, |
1905 | bool is_kprobe) | |
5a6f6314 MH |
1906 | { |
1907 | char buf[128]; | |
1908 | int ret; | |
1909 | ||
1910 | ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); | |
1911 | if (!ret) | |
1912 | return 0; | |
1913 | ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); | |
1914 | if (!ret) | |
1915 | return 0; | |
1916 | ||
1917 | pr_debug("Failed to find probe point from both of dwarf and map.\n"); | |
1918 | ||
1919 | if (tp->symbol) { | |
1920 | pp->function = strdup(tp->symbol); | |
1921 | pp->offset = tp->offset; | |
614e2fdb | 1922 | } else { |
5a6f6314 MH |
1923 | ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); |
1924 | if (ret < 0) | |
1925 | return ret; | |
1926 | pp->function = strdup(buf); | |
1927 | pp->offset = 0; | |
1928 | } | |
1929 | if (pp->function == NULL) | |
1930 | return -ENOMEM; | |
1931 | ||
1932 | pp->retprobe = tp->retprobe; | |
1933 | ||
1934 | return 0; | |
1935 | } | |
1936 | ||
0e60836b | 1937 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
225466f1 | 1938 | struct perf_probe_event *pev, bool is_kprobe) |
4235b045 | 1939 | { |
909b0360 | 1940 | struct strbuf buf = STRBUF_INIT; |
146a1439 | 1941 | int i, ret; |
4235b045 | 1942 | |
4b4da7f7 | 1943 | /* Convert event/group name */ |
02b95dad MH |
1944 | pev->event = strdup(tev->event); |
1945 | pev->group = strdup(tev->group); | |
1946 | if (pev->event == NULL || pev->group == NULL) | |
1947 | return -ENOMEM; | |
fb1587d8 | 1948 | |
4b4da7f7 | 1949 | /* Convert trace_point to probe_point */ |
5a6f6314 | 1950 | ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); |
146a1439 MH |
1951 | if (ret < 0) |
1952 | return ret; | |
4b4da7f7 | 1953 | |
4235b045 MH |
1954 | /* Convert trace_arg to probe_arg */ |
1955 | pev->nargs = tev->nargs; | |
e334016f MH |
1956 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1957 | if (pev->args == NULL) | |
1958 | return -ENOMEM; | |
02b95dad | 1959 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1960 | if (tev->args[i].name) |
02b95dad | 1961 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1962 | else { |
909b0360 MH |
1963 | strbuf_init(&buf, 32); |
1964 | ret = synthesize_probe_trace_arg(&tev->args[i], &buf); | |
1965 | pev->args[i].name = strbuf_detach(&buf, NULL); | |
4235b045 | 1966 | } |
02b95dad MH |
1967 | if (pev->args[i].name == NULL && ret >= 0) |
1968 | ret = -ENOMEM; | |
1969 | } | |
146a1439 MH |
1970 | |
1971 | if (ret < 0) | |
1972 | clear_perf_probe_event(pev); | |
1973 | ||
1974 | return ret; | |
4235b045 MH |
1975 | } |
1976 | ||
1977 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
1978 | { | |
7df2f329 | 1979 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
1980 | int i; |
1981 | ||
f5385650 ACM |
1982 | free(pev->event); |
1983 | free(pev->group); | |
7afb3fab | 1984 | free(pev->target); |
9b118aca | 1985 | clear_perf_probe_point(&pev->point); |
f5385650 | 1986 | |
7df2f329 | 1987 | for (i = 0; i < pev->nargs; i++) { |
f5385650 ACM |
1988 | free(pev->args[i].name); |
1989 | free(pev->args[i].var); | |
1990 | free(pev->args[i].type); | |
7df2f329 MH |
1991 | field = pev->args[i].field; |
1992 | while (field) { | |
1993 | next = field->next; | |
74cf249d | 1994 | zfree(&field->name); |
7df2f329 MH |
1995 | free(field); |
1996 | field = next; | |
1997 | } | |
1998 | } | |
f5385650 | 1999 | free(pev->args); |
4235b045 MH |
2000 | memset(pev, 0, sizeof(*pev)); |
2001 | } | |
2002 | ||
92f6c72e | 2003 | void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 2004 | { |
0e60836b | 2005 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
2006 | int i; |
2007 | ||
f5385650 ACM |
2008 | free(tev->event); |
2009 | free(tev->group); | |
2010 | free(tev->point.symbol); | |
4c859351 | 2011 | free(tev->point.realname); |
f5385650 | 2012 | free(tev->point.module); |
4235b045 | 2013 | for (i = 0; i < tev->nargs; i++) { |
f5385650 ACM |
2014 | free(tev->args[i].name); |
2015 | free(tev->args[i].value); | |
2016 | free(tev->args[i].type); | |
4235b045 MH |
2017 | ref = tev->args[i].ref; |
2018 | while (ref) { | |
2019 | next = ref->next; | |
2020 | free(ref); | |
2021 | ref = next; | |
2022 | } | |
2023 | } | |
f5385650 | 2024 | free(tev->args); |
4235b045 | 2025 | memset(tev, 0, sizeof(*tev)); |
50656eec MH |
2026 | } |
2027 | ||
9aaf5a5f MH |
2028 | struct kprobe_blacklist_node { |
2029 | struct list_head list; | |
2030 | unsigned long start; | |
2031 | unsigned long end; | |
2032 | char *symbol; | |
2033 | }; | |
2034 | ||
2035 | static void kprobe_blacklist__delete(struct list_head *blacklist) | |
2036 | { | |
2037 | struct kprobe_blacklist_node *node; | |
2038 | ||
2039 | while (!list_empty(blacklist)) { | |
2040 | node = list_first_entry(blacklist, | |
2041 | struct kprobe_blacklist_node, list); | |
2042 | list_del(&node->list); | |
2043 | free(node->symbol); | |
2044 | free(node); | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | static int kprobe_blacklist__load(struct list_head *blacklist) | |
2049 | { | |
2050 | struct kprobe_blacklist_node *node; | |
4605eab3 | 2051 | const char *__debugfs = debugfs__mountpoint(); |
9aaf5a5f MH |
2052 | char buf[PATH_MAX], *p; |
2053 | FILE *fp; | |
2054 | int ret; | |
2055 | ||
2056 | if (__debugfs == NULL) | |
2057 | return -ENOTSUP; | |
2058 | ||
2059 | ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); | |
2060 | if (ret < 0) | |
2061 | return ret; | |
2062 | ||
2063 | fp = fopen(buf, "r"); | |
2064 | if (!fp) | |
2065 | return -errno; | |
2066 | ||
2067 | ret = 0; | |
2068 | while (fgets(buf, PATH_MAX, fp)) { | |
2069 | node = zalloc(sizeof(*node)); | |
2070 | if (!node) { | |
2071 | ret = -ENOMEM; | |
2072 | break; | |
2073 | } | |
2074 | INIT_LIST_HEAD(&node->list); | |
2075 | list_add_tail(&node->list, blacklist); | |
2076 | if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { | |
2077 | ret = -EINVAL; | |
2078 | break; | |
2079 | } | |
2080 | p = strchr(buf, '\t'); | |
2081 | if (p) { | |
2082 | p++; | |
2083 | if (p[strlen(p) - 1] == '\n') | |
2084 | p[strlen(p) - 1] = '\0'; | |
2085 | } else | |
2086 | p = (char *)"unknown"; | |
2087 | node->symbol = strdup(p); | |
2088 | if (!node->symbol) { | |
2089 | ret = -ENOMEM; | |
2090 | break; | |
2091 | } | |
2092 | pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", | |
2093 | node->start, node->end, node->symbol); | |
2094 | ret++; | |
2095 | } | |
2096 | if (ret < 0) | |
2097 | kprobe_blacklist__delete(blacklist); | |
2098 | fclose(fp); | |
2099 | ||
2100 | return ret; | |
2101 | } | |
2102 | ||
2103 | static struct kprobe_blacklist_node * | |
2104 | kprobe_blacklist__find_by_address(struct list_head *blacklist, | |
2105 | unsigned long address) | |
2106 | { | |
2107 | struct kprobe_blacklist_node *node; | |
2108 | ||
2109 | list_for_each_entry(node, blacklist, list) { | |
2110 | if (node->start <= address && address <= node->end) | |
2111 | return node; | |
2112 | } | |
2113 | ||
2114 | return NULL; | |
2115 | } | |
2116 | ||
b031220d MH |
2117 | static LIST_HEAD(kprobe_blacklist); |
2118 | ||
2119 | static void kprobe_blacklist__init(void) | |
2120 | { | |
2121 | if (!list_empty(&kprobe_blacklist)) | |
2122 | return; | |
2123 | ||
2124 | if (kprobe_blacklist__load(&kprobe_blacklist) < 0) | |
2125 | pr_debug("No kprobe blacklist support, ignored\n"); | |
2126 | } | |
2127 | ||
2128 | static void kprobe_blacklist__release(void) | |
2129 | { | |
2130 | kprobe_blacklist__delete(&kprobe_blacklist); | |
2131 | } | |
2132 | ||
2133 | static bool kprobe_blacklist__listed(unsigned long address) | |
2134 | { | |
2135 | return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); | |
2136 | } | |
2137 | ||
d350bd57 MH |
2138 | static int perf_probe_event__sprintf(const char *group, const char *event, |
2139 | struct perf_probe_event *pev, | |
ba7ecb02 MH |
2140 | const char *module, |
2141 | struct strbuf *result) | |
278498d4 | 2142 | { |
909b0360 MH |
2143 | int i; |
2144 | char *buf; | |
278498d4 | 2145 | |
909b0360 MH |
2146 | if (asprintf(&buf, "%s:%s", group, event) < 0) |
2147 | return -errno; | |
2148 | strbuf_addf(result, " %-20s (on ", buf); | |
2149 | free(buf); | |
4235b045 | 2150 | |
909b0360 MH |
2151 | /* Synthesize only event probe point */ |
2152 | buf = synthesize_perf_probe_point(&pev->point); | |
2153 | if (!buf) | |
2154 | return -ENOMEM; | |
2155 | strbuf_addstr(result, buf); | |
2156 | free(buf); | |
146a1439 | 2157 | |
fb226ccd | 2158 | if (module) |
ba7ecb02 | 2159 | strbuf_addf(result, " in %s", module); |
278498d4 | 2160 | |
4235b045 | 2161 | if (pev->nargs > 0) { |
88fd633c | 2162 | strbuf_add(result, " with", 5); |
7df2f329 | 2163 | for (i = 0; i < pev->nargs; i++) { |
909b0360 MH |
2164 | buf = synthesize_perf_probe_arg(&pev->args[i]); |
2165 | if (!buf) | |
2166 | return -ENOMEM; | |
ba7ecb02 | 2167 | strbuf_addf(result, " %s", buf); |
909b0360 | 2168 | free(buf); |
7df2f329 | 2169 | } |
278498d4 | 2170 | } |
ba7ecb02 | 2171 | strbuf_addch(result, ')'); |
909b0360 MH |
2172 | |
2173 | return 0; | |
278498d4 MH |
2174 | } |
2175 | ||
ba7ecb02 | 2176 | /* Show an event */ |
b02137cc NK |
2177 | int show_perf_probe_event(const char *group, const char *event, |
2178 | struct perf_probe_event *pev, | |
2179 | const char *module, bool use_stdout) | |
ba7ecb02 MH |
2180 | { |
2181 | struct strbuf buf = STRBUF_INIT; | |
2182 | int ret; | |
2183 | ||
d350bd57 | 2184 | ret = perf_probe_event__sprintf(group, event, pev, module, &buf); |
ba7ecb02 MH |
2185 | if (ret >= 0) { |
2186 | if (use_stdout) | |
2187 | printf("%s\n", buf.buf); | |
2188 | else | |
2189 | pr_info("%s\n", buf.buf); | |
2190 | } | |
2191 | strbuf_release(&buf); | |
2192 | ||
2193 | return ret; | |
2194 | } | |
2195 | ||
b6a89643 MH |
2196 | static bool filter_probe_trace_event(struct probe_trace_event *tev, |
2197 | struct strfilter *filter) | |
2198 | { | |
2199 | char tmp[128]; | |
2200 | ||
2201 | /* At first, check the event name itself */ | |
2202 | if (strfilter__compare(filter, tev->event)) | |
2203 | return true; | |
2204 | ||
2205 | /* Next, check the combination of name and group */ | |
2206 | if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) | |
2207 | return false; | |
2208 | return strfilter__compare(filter, tmp); | |
2209 | } | |
2210 | ||
2211 | static int __show_perf_probe_events(int fd, bool is_kprobe, | |
2212 | struct strfilter *filter) | |
4de189fe | 2213 | { |
225466f1 | 2214 | int ret = 0; |
0e60836b | 2215 | struct probe_trace_event tev; |
4235b045 | 2216 | struct perf_probe_event pev; |
4de189fe MH |
2217 | struct strlist *rawlist; |
2218 | struct str_node *ent; | |
2219 | ||
4235b045 MH |
2220 | memset(&tev, 0, sizeof(tev)); |
2221 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 2222 | |
92f6c72e | 2223 | rawlist = probe_file__get_rawlist(fd); |
146a1439 | 2224 | if (!rawlist) |
6eb08660 | 2225 | return -ENOMEM; |
4de189fe | 2226 | |
adf365f4 | 2227 | strlist__for_each(ent, rawlist) { |
0e60836b | 2228 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 | 2229 | if (ret >= 0) { |
b6a89643 MH |
2230 | if (!filter_probe_trace_event(&tev, filter)) |
2231 | goto next; | |
225466f1 SD |
2232 | ret = convert_to_perf_probe_event(&tev, &pev, |
2233 | is_kprobe); | |
ba7ecb02 MH |
2234 | if (ret < 0) |
2235 | goto next; | |
d350bd57 MH |
2236 | ret = show_perf_probe_event(pev.group, pev.event, |
2237 | &pev, tev.point.module, | |
ba7ecb02 | 2238 | true); |
146a1439 | 2239 | } |
b6a89643 | 2240 | next: |
4235b045 | 2241 | clear_perf_probe_event(&pev); |
0e60836b | 2242 | clear_probe_trace_event(&tev); |
146a1439 MH |
2243 | if (ret < 0) |
2244 | break; | |
4de189fe | 2245 | } |
4de189fe | 2246 | strlist__delete(rawlist); |
7737af01 MH |
2247 | /* Cleanup cached debuginfo if needed */ |
2248 | debuginfo_cache__exit(); | |
146a1439 MH |
2249 | |
2250 | return ret; | |
4de189fe MH |
2251 | } |
2252 | ||
225466f1 | 2253 | /* List up current perf-probe events */ |
b6a89643 | 2254 | int show_perf_probe_events(struct strfilter *filter) |
225466f1 | 2255 | { |
5e45187c | 2256 | int kp_fd, up_fd, ret; |
225466f1 SD |
2257 | |
2258 | setup_pager(); | |
225466f1 | 2259 | |
9bae1e8c | 2260 | ret = init_probe_symbol_maps(false); |
225466f1 SD |
2261 | if (ret < 0) |
2262 | return ret; | |
2263 | ||
92f6c72e MH |
2264 | ret = probe_file__open_both(&kp_fd, &up_fd, 0); |
2265 | if (ret < 0) | |
2266 | return ret; | |
225466f1 | 2267 | |
92f6c72e MH |
2268 | if (kp_fd >= 0) |
2269 | ret = __show_perf_probe_events(kp_fd, true, filter); | |
2270 | if (up_fd >= 0 && ret >= 0) | |
b6a89643 | 2271 | ret = __show_perf_probe_events(up_fd, false, filter); |
92f6c72e MH |
2272 | if (kp_fd > 0) |
2273 | close(kp_fd); | |
2274 | if (up_fd > 0) | |
5e45187c | 2275 | close(up_fd); |
9bae1e8c | 2276 | exit_probe_symbol_maps(); |
225466f1 | 2277 | |
146a1439 | 2278 | return ret; |
50656eec MH |
2279 | } |
2280 | ||
146a1439 MH |
2281 | static int get_new_event_name(char *buf, size_t len, const char *base, |
2282 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
2283 | { |
2284 | int i, ret; | |
663b1151 | 2285 | char *p, *nbase; |
17f88fcd | 2286 | |
3099c026 NR |
2287 | if (*base == '.') |
2288 | base++; | |
663b1151 MH |
2289 | nbase = strdup(base); |
2290 | if (!nbase) | |
2291 | return -ENOMEM; | |
2292 | ||
2293 | /* Cut off the dot suffixes (e.g. .const, .isra)*/ | |
2294 | p = strchr(nbase, '.'); | |
2295 | if (p && p != nbase) | |
2296 | *p = '\0'; | |
3099c026 | 2297 | |
663b1151 MH |
2298 | /* Try no suffix number */ |
2299 | ret = e_snprintf(buf, len, "%s", nbase); | |
146a1439 | 2300 | if (ret < 0) { |
5f03cba4 | 2301 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2302 | goto out; |
146a1439 | 2303 | } |
17f88fcd | 2304 | if (!strlist__has_entry(namelist, buf)) |
663b1151 | 2305 | goto out; |
17f88fcd | 2306 | |
d761b08b | 2307 | if (!allow_suffix) { |
03e01f56 WN |
2308 | pr_warning("Error: event \"%s\" already exists.\n" |
2309 | " Hint: Remove existing event by 'perf probe -d'\n" | |
2310 | " or force duplicates by 'perf probe -f'\n" | |
2311 | " or set 'force=yes' in BPF source.\n", | |
2312 | buf); | |
663b1151 MH |
2313 | ret = -EEXIST; |
2314 | goto out; | |
d761b08b MH |
2315 | } |
2316 | ||
17f88fcd MH |
2317 | /* Try to add suffix */ |
2318 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
663b1151 | 2319 | ret = e_snprintf(buf, len, "%s_%d", nbase, i); |
146a1439 | 2320 | if (ret < 0) { |
5f03cba4 | 2321 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2322 | goto out; |
146a1439 | 2323 | } |
b498ce1f MH |
2324 | if (!strlist__has_entry(namelist, buf)) |
2325 | break; | |
2326 | } | |
146a1439 MH |
2327 | if (i == MAX_EVENT_INDEX) { |
2328 | pr_warning("Too many events are on the same function.\n"); | |
2329 | ret = -ERANGE; | |
2330 | } | |
2331 | ||
663b1151 MH |
2332 | out: |
2333 | free(nbase); | |
146a1439 | 2334 | return ret; |
b498ce1f MH |
2335 | } |
2336 | ||
79702f61 MH |
2337 | /* Warn if the current kernel's uprobe implementation is old */ |
2338 | static void warn_uprobe_event_compat(struct probe_trace_event *tev) | |
2339 | { | |
2340 | int i; | |
2341 | char *buf = synthesize_probe_trace_command(tev); | |
2342 | ||
2343 | /* Old uprobe event doesn't support memory dereference */ | |
2344 | if (!tev->uprobes || tev->nargs == 0 || !buf) | |
2345 | goto out; | |
2346 | ||
2347 | for (i = 0; i < tev->nargs; i++) | |
2348 | if (strglobmatch(tev->args[i].value, "[$@+-]*")) { | |
2349 | pr_warning("Please upgrade your kernel to at least " | |
2350 | "3.14 to have access to feature %s\n", | |
2351 | tev->args[i].value); | |
2352 | break; | |
2353 | } | |
2354 | out: | |
2355 | free(buf); | |
2356 | } | |
2357 | ||
a3c9de62 MH |
2358 | /* Set new name from original perf_probe_event and namelist */ |
2359 | static int probe_trace_event__set_name(struct probe_trace_event *tev, | |
2360 | struct perf_probe_event *pev, | |
2361 | struct strlist *namelist, | |
2362 | bool allow_suffix) | |
2363 | { | |
2364 | const char *event, *group; | |
2365 | char buf[64]; | |
2366 | int ret; | |
2367 | ||
2368 | if (pev->event) | |
2369 | event = pev->event; | |
2370 | else | |
da15bd9d WN |
2371 | if (pev->point.function && |
2372 | (strncmp(pev->point.function, "0x", 2) != 0) && | |
2373 | !strisglob(pev->point.function)) | |
a3c9de62 MH |
2374 | event = pev->point.function; |
2375 | else | |
2376 | event = tev->point.realname; | |
2377 | if (pev->group) | |
2378 | group = pev->group; | |
2379 | else | |
2380 | group = PERFPROBE_GROUP; | |
2381 | ||
2382 | /* Get an unused new event name */ | |
2383 | ret = get_new_event_name(buf, 64, event, | |
2384 | namelist, allow_suffix); | |
2385 | if (ret < 0) | |
2386 | return ret; | |
2387 | ||
2388 | event = buf; | |
2389 | ||
2390 | tev->event = strdup(event); | |
2391 | tev->group = strdup(group); | |
2392 | if (tev->event == NULL || tev->group == NULL) | |
2393 | return -ENOMEM; | |
2394 | ||
2395 | /* Add added event name to namelist */ | |
2396 | strlist__add(namelist, event); | |
2397 | return 0; | |
2398 | } | |
2399 | ||
0e60836b SD |
2400 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
2401 | struct probe_trace_event *tevs, | |
146a1439 | 2402 | int ntevs, bool allow_suffix) |
50656eec | 2403 | { |
146a1439 | 2404 | int i, fd, ret; |
0e60836b | 2405 | struct probe_trace_event *tev = NULL; |
b498ce1f | 2406 | struct strlist *namelist; |
50656eec | 2407 | |
92f6c72e MH |
2408 | fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0)); |
2409 | if (fd < 0) | |
146a1439 | 2410 | return fd; |
5e45187c | 2411 | |
b498ce1f | 2412 | /* Get current event names */ |
92f6c72e | 2413 | namelist = probe_file__get_namelist(fd); |
146a1439 MH |
2414 | if (!namelist) { |
2415 | pr_debug("Failed to get current event list.\n"); | |
ae2cb1ac MH |
2416 | ret = -ENOMEM; |
2417 | goto close_out; | |
146a1439 | 2418 | } |
4235b045 | 2419 | |
146a1439 | 2420 | ret = 0; |
02b95dad | 2421 | for (i = 0; i < ntevs; i++) { |
4235b045 | 2422 | tev = &tevs[i]; |
b031220d | 2423 | /* Skip if the symbol is out of .text or blacklisted */ |
5a51fcd1 MH |
2424 | if (!tev->point.symbol) |
2425 | continue; | |
9aaf5a5f | 2426 | |
a3c9de62 MH |
2427 | /* Set new name for tev (and update namelist) */ |
2428 | ret = probe_trace_event__set_name(tev, pev, namelist, | |
2429 | allow_suffix); | |
146a1439 MH |
2430 | if (ret < 0) |
2431 | break; | |
4235b045 | 2432 | |
92f6c72e | 2433 | ret = probe_file__add_event(fd, tev); |
146a1439 MH |
2434 | if (ret < 0) |
2435 | break; | |
4235b045 | 2436 | |
4235b045 MH |
2437 | /* |
2438 | * Probes after the first probe which comes from same | |
2439 | * user input are always allowed to add suffix, because | |
2440 | * there might be several addresses corresponding to | |
2441 | * one code line. | |
2442 | */ | |
2443 | allow_suffix = true; | |
50656eec | 2444 | } |
79702f61 MH |
2445 | if (ret == -EINVAL && pev->uprobes) |
2446 | warn_uprobe_event_compat(tev); | |
146a1439 | 2447 | |
e1d2017b | 2448 | strlist__delete(namelist); |
ae2cb1ac | 2449 | close_out: |
50656eec | 2450 | close(fd); |
146a1439 | 2451 | return ret; |
50656eec | 2452 | } |
fa28244d | 2453 | |
6bb536cc WN |
2454 | static int find_probe_functions(struct map *map, char *name, |
2455 | struct symbol **syms) | |
eb948e50 | 2456 | { |
564c62a4 | 2457 | int found = 0; |
0a3873a8 | 2458 | struct symbol *sym; |
4c859351 | 2459 | struct rb_node *tmp; |
564c62a4 | 2460 | |
75e4a2a6 WN |
2461 | if (map__load(map, NULL) < 0) |
2462 | return 0; | |
2463 | ||
4c859351 | 2464 | map__for_each_symbol(map, sym, tmp) { |
6bb536cc | 2465 | if (strglobmatch(sym->name, name)) { |
4c859351 | 2466 | found++; |
6bb536cc WN |
2467 | if (syms && found < probe_conf.max_probes) |
2468 | syms[found - 1] = sym; | |
2469 | } | |
eb948e50 | 2470 | } |
564c62a4 NK |
2471 | |
2472 | return found; | |
eb948e50 MH |
2473 | } |
2474 | ||
2475 | #define strdup_or_goto(str, label) \ | |
2476 | ({ char *__p = strdup(str); if (!__p) goto label; __p; }) | |
2477 | ||
7b6ff0bd NR |
2478 | void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, |
2479 | struct probe_trace_event *tev __maybe_unused, | |
2480 | struct map *map __maybe_unused) { } | |
2481 | ||
eb948e50 MH |
2482 | /* |
2483 | * Find probe function addresses from map. | |
2484 | * Return an error or the number of found probe_trace_event | |
2485 | */ | |
2486 | static int find_probe_trace_events_from_map(struct perf_probe_event *pev, | |
ddb2f58f | 2487 | struct probe_trace_event **tevs) |
e0faa8d3 | 2488 | { |
eb948e50 | 2489 | struct map *map = NULL; |
eb948e50 | 2490 | struct ref_reloc_sym *reloc_sym = NULL; |
e0faa8d3 | 2491 | struct symbol *sym; |
6bb536cc | 2492 | struct symbol **syms = NULL; |
0e60836b | 2493 | struct probe_trace_event *tev; |
eb948e50 MH |
2494 | struct perf_probe_point *pp = &pev->point; |
2495 | struct probe_trace_point *tp; | |
564c62a4 | 2496 | int num_matched_functions; |
b031220d | 2497 | int ret, i, j, skipped = 0; |
c61fb959 | 2498 | char *mod_name; |
4235b045 | 2499 | |
44225521 | 2500 | map = get_target_map(pev->target, pev->uprobes); |
eb948e50 MH |
2501 | if (!map) { |
2502 | ret = -EINVAL; | |
2503 | goto out; | |
fb7345bb MH |
2504 | } |
2505 | ||
6bb536cc WN |
2506 | syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); |
2507 | if (!syms) { | |
2508 | ret = -ENOMEM; | |
2509 | goto out; | |
2510 | } | |
2511 | ||
eb948e50 MH |
2512 | /* |
2513 | * Load matched symbols: Since the different local symbols may have | |
2514 | * same name but different addresses, this lists all the symbols. | |
2515 | */ | |
6bb536cc | 2516 | num_matched_functions = find_probe_functions(map, pp->function, syms); |
564c62a4 | 2517 | if (num_matched_functions == 0) { |
eb948e50 | 2518 | pr_err("Failed to find symbol %s in %s\n", pp->function, |
44225521 | 2519 | pev->target ? : "kernel"); |
eb948e50 MH |
2520 | ret = -ENOENT; |
2521 | goto out; | |
ddb2f58f | 2522 | } else if (num_matched_functions > probe_conf.max_probes) { |
eb948e50 | 2523 | pr_err("Too many functions matched in %s\n", |
44225521 | 2524 | pev->target ? : "kernel"); |
eb948e50 MH |
2525 | ret = -E2BIG; |
2526 | goto out; | |
fb7345bb MH |
2527 | } |
2528 | ||
1a8ac29c MH |
2529 | /* Note that the symbols in the kmodule are not relocated */ |
2530 | if (!pev->uprobes && !pp->retprobe && !pev->target) { | |
0560a0c4 | 2531 | reloc_sym = kernel_get_ref_reloc_sym(); |
eb948e50 MH |
2532 | if (!reloc_sym) { |
2533 | pr_warning("Relocated base symbol is not found!\n"); | |
2534 | ret = -EINVAL; | |
2535 | goto out; | |
2536 | } | |
2537 | } | |
4235b045 | 2538 | |
eb948e50 MH |
2539 | /* Setup result trace-probe-events */ |
2540 | *tevs = zalloc(sizeof(*tev) * num_matched_functions); | |
2541 | if (!*tevs) { | |
02b95dad | 2542 | ret = -ENOMEM; |
eb948e50 | 2543 | goto out; |
02b95dad | 2544 | } |
ce27a443 | 2545 | |
eb948e50 | 2546 | ret = 0; |
564c62a4 | 2547 | |
6bb536cc WN |
2548 | for (j = 0; j < num_matched_functions; j++) { |
2549 | sym = syms[j]; | |
2550 | ||
eb948e50 MH |
2551 | tev = (*tevs) + ret; |
2552 | tp = &tev->point; | |
2553 | if (ret == num_matched_functions) { | |
2554 | pr_warning("Too many symbols are listed. Skip it.\n"); | |
2555 | break; | |
ce27a443 | 2556 | } |
eb948e50 | 2557 | ret++; |
ce27a443 | 2558 | |
eb948e50 MH |
2559 | if (pp->offset > sym->end - sym->start) { |
2560 | pr_warning("Offset %ld is bigger than the size of %s\n", | |
2561 | pp->offset, sym->name); | |
2562 | ret = -ENOENT; | |
2563 | goto err_out; | |
2564 | } | |
2565 | /* Add one probe point */ | |
2566 | tp->address = map->unmap_ip(map, sym->start) + pp->offset; | |
1a8ac29c MH |
2567 | |
2568 | /* Check the kprobe (not in module) is within .text */ | |
2569 | if (!pev->uprobes && !pev->target && | |
b031220d MH |
2570 | kprobe_warn_out_range(sym->name, tp->address)) { |
2571 | tp->symbol = NULL; /* Skip it */ | |
2572 | skipped++; | |
2573 | } else if (reloc_sym) { | |
eb948e50 MH |
2574 | tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); |
2575 | tp->offset = tp->address - reloc_sym->addr; | |
2576 | } else { | |
2577 | tp->symbol = strdup_or_goto(sym->name, nomem_out); | |
2578 | tp->offset = pp->offset; | |
2579 | } | |
6bb536cc WN |
2580 | tp->realname = strdup_or_goto(sym->name, nomem_out); |
2581 | ||
eb948e50 | 2582 | tp->retprobe = pp->retprobe; |
c61fb959 RB |
2583 | if (pev->target) { |
2584 | if (pev->uprobes) { | |
2585 | tev->point.module = strdup_or_goto(pev->target, | |
2586 | nomem_out); | |
2587 | } else { | |
2588 | mod_name = find_module_name(pev->target); | |
2589 | tev->point.module = | |
2590 | strdup(mod_name ? mod_name : pev->target); | |
2591 | free(mod_name); | |
2592 | if (!tev->point.module) | |
2593 | goto nomem_out; | |
2594 | } | |
2595 | } | |
eb948e50 MH |
2596 | tev->uprobes = pev->uprobes; |
2597 | tev->nargs = pev->nargs; | |
2598 | if (tev->nargs) { | |
2599 | tev->args = zalloc(sizeof(struct probe_trace_arg) * | |
2600 | tev->nargs); | |
2601 | if (tev->args == NULL) | |
2602 | goto nomem_out; | |
e334016f | 2603 | } |
48481938 | 2604 | for (i = 0; i < tev->nargs; i++) { |
eb948e50 MH |
2605 | if (pev->args[i].name) |
2606 | tev->args[i].name = | |
2607 | strdup_or_goto(pev->args[i].name, | |
2608 | nomem_out); | |
2609 | ||
2610 | tev->args[i].value = strdup_or_goto(pev->args[i].var, | |
2611 | nomem_out); | |
2612 | if (pev->args[i].type) | |
2613 | tev->args[i].type = | |
2614 | strdup_or_goto(pev->args[i].type, | |
2615 | nomem_out); | |
48481938 | 2616 | } |
7b6ff0bd | 2617 | arch__fix_tev_from_maps(pev, tev, map); |
4235b045 | 2618 | } |
b031220d MH |
2619 | if (ret == skipped) { |
2620 | ret = -ENOENT; | |
2621 | goto err_out; | |
2622 | } | |
4235b045 | 2623 | |
eb948e50 | 2624 | out: |
9b118aca | 2625 | put_target_map(map, pev->uprobes); |
6bb536cc | 2626 | free(syms); |
eb948e50 | 2627 | return ret; |
225466f1 | 2628 | |
eb948e50 MH |
2629 | nomem_out: |
2630 | ret = -ENOMEM; | |
2631 | err_out: | |
2632 | clear_probe_trace_events(*tevs, num_matched_functions); | |
2633 | zfree(tevs); | |
2634 | goto out; | |
2635 | } | |
1c1bc922 | 2636 | |
da15bd9d WN |
2637 | static int try_to_find_absolute_address(struct perf_probe_event *pev, |
2638 | struct probe_trace_event **tevs) | |
2639 | { | |
2640 | struct perf_probe_point *pp = &pev->point; | |
2641 | struct probe_trace_event *tev; | |
2642 | struct probe_trace_point *tp; | |
2643 | int i, err; | |
2644 | ||
2645 | if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) | |
2646 | return -EINVAL; | |
2647 | if (perf_probe_event_need_dwarf(pev)) | |
2648 | return -EINVAL; | |
2649 | ||
2650 | /* | |
2651 | * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at | |
2652 | * absolute address. | |
2653 | * | |
2654 | * Only one tev can be generated by this. | |
2655 | */ | |
2656 | *tevs = zalloc(sizeof(*tev)); | |
2657 | if (!*tevs) | |
2658 | return -ENOMEM; | |
2659 | ||
2660 | tev = *tevs; | |
2661 | tp = &tev->point; | |
2662 | ||
2663 | /* | |
2664 | * Don't use tp->offset, use address directly, because | |
2665 | * in synthesize_probe_trace_command() address cannot be | |
2666 | * zero. | |
2667 | */ | |
2668 | tp->address = pev->point.abs_address; | |
2669 | tp->retprobe = pp->retprobe; | |
2670 | tev->uprobes = pev->uprobes; | |
2671 | ||
2672 | err = -ENOMEM; | |
2673 | /* | |
2674 | * Give it a '0x' leading symbol name. | |
2675 | * In __add_probe_trace_events, a NULL symbol is interpreted as | |
2676 | * invalud. | |
2677 | */ | |
2678 | if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) | |
2679 | goto errout; | |
2680 | ||
2681 | /* For kprobe, check range */ | |
2682 | if ((!tev->uprobes) && | |
2683 | (kprobe_warn_out_range(tev->point.symbol, | |
2684 | tev->point.address))) { | |
2685 | err = -EACCES; | |
2686 | goto errout; | |
2687 | } | |
2688 | ||
2689 | if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) | |
2690 | goto errout; | |
2691 | ||
2692 | if (pev->target) { | |
2693 | tp->module = strdup(pev->target); | |
2694 | if (!tp->module) | |
2695 | goto errout; | |
2696 | } | |
2697 | ||
2698 | if (tev->group) { | |
2699 | tev->group = strdup(pev->group); | |
2700 | if (!tev->group) | |
2701 | goto errout; | |
2702 | } | |
2703 | ||
2704 | if (pev->event) { | |
2705 | tev->event = strdup(pev->event); | |
2706 | if (!tev->event) | |
2707 | goto errout; | |
2708 | } | |
2709 | ||
2710 | tev->nargs = pev->nargs; | |
2711 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
2712 | if (!tev->args) { | |
2713 | err = -ENOMEM; | |
2714 | goto errout; | |
2715 | } | |
2716 | for (i = 0; i < tev->nargs; i++) | |
2717 | copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); | |
2718 | ||
2719 | return 1; | |
2720 | ||
2721 | errout: | |
2722 | if (*tevs) { | |
2723 | clear_probe_trace_events(*tevs, 1); | |
2724 | *tevs = NULL; | |
2725 | } | |
2726 | return err; | |
2727 | } | |
2728 | ||
d5c2e2c1 NR |
2729 | bool __weak arch__prefers_symtab(void) { return false; } |
2730 | ||
eb948e50 | 2731 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 2732 | struct probe_trace_event **tevs) |
eb948e50 MH |
2733 | { |
2734 | int ret; | |
2735 | ||
2a12ec13 MH |
2736 | if (!pev->group) { |
2737 | /* Set group name if not given */ | |
2738 | if (!pev->uprobes) { | |
2739 | pev->group = strdup(PERFPROBE_GROUP); | |
2740 | ret = pev->group ? 0 : -ENOMEM; | |
2741 | } else | |
2742 | ret = convert_exec_to_group(pev->target, &pev->group); | |
eb948e50 MH |
2743 | if (ret != 0) { |
2744 | pr_warning("Failed to make a group name.\n"); | |
2745 | return ret; | |
2746 | } | |
02b95dad | 2747 | } |
e334016f | 2748 | |
da15bd9d WN |
2749 | ret = try_to_find_absolute_address(pev, tevs); |
2750 | if (ret > 0) | |
2751 | return ret; | |
2752 | ||
d5c2e2c1 | 2753 | if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) { |
ddb2f58f | 2754 | ret = find_probe_trace_events_from_map(pev, tevs); |
d5c2e2c1 NR |
2755 | if (ret > 0) |
2756 | return ret; /* Found in symbol table */ | |
2757 | } | |
2758 | ||
eb948e50 | 2759 | /* Convert perf_probe_event with debuginfo */ |
ddb2f58f | 2760 | ret = try_to_find_probe_trace_events(pev, tevs); |
eb948e50 MH |
2761 | if (ret != 0) |
2762 | return ret; /* Found in debuginfo or got an error */ | |
2763 | ||
ddb2f58f | 2764 | return find_probe_trace_events_from_map(pev, tevs); |
4235b045 MH |
2765 | } |
2766 | ||
12fae5ef | 2767 | int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
4235b045 | 2768 | { |
844dffa5 | 2769 | int i, ret; |
4235b045 | 2770 | |
4235b045 MH |
2771 | /* Loop 1: convert all events */ |
2772 | for (i = 0; i < npevs; i++) { | |
b031220d | 2773 | /* Init kprobe blacklist if needed */ |
12fae5ef | 2774 | if (!pevs[i].uprobes) |
b031220d | 2775 | kprobe_blacklist__init(); |
4235b045 | 2776 | /* Convert with or without debuginfo */ |
12fae5ef | 2777 | ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); |
146a1439 | 2778 | if (ret < 0) |
844dffa5 | 2779 | return ret; |
12fae5ef | 2780 | pevs[i].ntevs = ret; |
e0faa8d3 | 2781 | } |
b031220d MH |
2782 | /* This just release blacklist only if allocated */ |
2783 | kprobe_blacklist__release(); | |
e0faa8d3 | 2784 | |
844dffa5 NK |
2785 | return 0; |
2786 | } | |
2787 | ||
12fae5ef | 2788 | int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
2789 | { |
2790 | int i, ret = 0; | |
2791 | ||
4235b045 | 2792 | /* Loop 2: add all events */ |
8635bf6e | 2793 | for (i = 0; i < npevs; i++) { |
12fae5ef WN |
2794 | ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, |
2795 | pevs[i].ntevs, | |
ddb2f58f | 2796 | probe_conf.force_add); |
fbee632d ACM |
2797 | if (ret < 0) |
2798 | break; | |
2799 | } | |
844dffa5 NK |
2800 | return ret; |
2801 | } | |
2802 | ||
12fae5ef | 2803 | void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
2804 | { |
2805 | int i, j; | |
2806 | ||
449e5b24 MH |
2807 | /* Loop 3: cleanup and free trace events */ |
2808 | for (i = 0; i < npevs; i++) { | |
12fae5ef WN |
2809 | for (j = 0; j < pevs[i].ntevs; j++) |
2810 | clear_probe_trace_event(&pevs[i].tevs[j]); | |
2811 | zfree(&pevs[i].tevs); | |
2812 | pevs[i].ntevs = 0; | |
a43aac29 | 2813 | clear_perf_probe_event(&pevs[i]); |
449e5b24 | 2814 | } |
844dffa5 NK |
2815 | } |
2816 | ||
2817 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) | |
2818 | { | |
2819 | int ret; | |
844dffa5 | 2820 | |
9bae1e8c NK |
2821 | ret = init_probe_symbol_maps(pevs->uprobes); |
2822 | if (ret < 0) | |
2823 | return ret; | |
2824 | ||
12fae5ef | 2825 | ret = convert_perf_probe_events(pevs, npevs); |
844dffa5 | 2826 | if (ret == 0) |
12fae5ef | 2827 | ret = apply_perf_probe_events(pevs, npevs); |
844dffa5 | 2828 | |
12fae5ef | 2829 | cleanup_perf_probe_events(pevs, npevs); |
146a1439 | 2830 | |
9bae1e8c | 2831 | exit_probe_symbol_maps(); |
146a1439 | 2832 | return ret; |
e0faa8d3 MH |
2833 | } |
2834 | ||
307a464b | 2835 | int del_perf_probe_events(struct strfilter *filter) |
fa28244d | 2836 | { |
307a464b | 2837 | int ret, ret2, ufd = -1, kfd = -1; |
307a464b MH |
2838 | char *str = strfilter__string(filter); |
2839 | ||
2840 | if (!str) | |
2841 | return -EINVAL; | |
2842 | ||
fa28244d | 2843 | /* Get current event names */ |
92f6c72e MH |
2844 | ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); |
2845 | if (ret < 0) | |
2846 | goto out; | |
467ec085 | 2847 | |
92f6c72e | 2848 | ret = probe_file__del_events(kfd, filter); |
307a464b | 2849 | if (ret < 0 && ret != -ENOENT) |
225466f1 | 2850 | goto error; |
225466f1 | 2851 | |
92f6c72e | 2852 | ret2 = probe_file__del_events(ufd, filter); |
dddc7ee3 | 2853 | if (ret2 < 0 && ret2 != -ENOENT) { |
307a464b | 2854 | ret = ret2; |
dddc7ee3 MH |
2855 | goto error; |
2856 | } | |
dddc7ee3 | 2857 | ret = 0; |
225466f1 SD |
2858 | |
2859 | error: | |
92f6c72e | 2860 | if (kfd >= 0) |
225466f1 | 2861 | close(kfd); |
92f6c72e | 2862 | if (ufd >= 0) |
225466f1 | 2863 | close(ufd); |
92f6c72e | 2864 | out: |
307a464b | 2865 | free(str); |
146a1439 MH |
2866 | |
2867 | return ret; | |
fa28244d | 2868 | } |
225466f1 | 2869 | |
3c42258c MH |
2870 | /* TODO: don't use a global variable for filter ... */ |
2871 | static struct strfilter *available_func_filter; | |
fa28244d | 2872 | |
e80711ca | 2873 | /* |
3c42258c MH |
2874 | * If a symbol corresponds to a function with global binding and |
2875 | * matches filter return 0. For all others return 1. | |
e80711ca | 2876 | */ |
1d037ca1 | 2877 | static int filter_available_functions(struct map *map __maybe_unused, |
3c42258c | 2878 | struct symbol *sym) |
e80711ca | 2879 | { |
e578da3b | 2880 | if (strfilter__compare(available_func_filter, sym->name)) |
3c42258c MH |
2881 | return 0; |
2882 | return 1; | |
e80711ca MH |
2883 | } |
2884 | ||
2df58634 MH |
2885 | int show_available_funcs(const char *target, struct strfilter *_filter, |
2886 | bool user) | |
e80711ca MH |
2887 | { |
2888 | struct map *map; | |
2889 | int ret; | |
2890 | ||
9bae1e8c | 2891 | ret = init_probe_symbol_maps(user); |
e80711ca MH |
2892 | if (ret < 0) |
2893 | return ret; | |
2894 | ||
2df58634 MH |
2895 | /* Get a symbol map */ |
2896 | if (user) | |
2897 | map = dso__new_map(target); | |
2898 | else | |
2899 | map = kernel_get_module_map(target); | |
e80711ca | 2900 | if (!map) { |
2df58634 | 2901 | pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); |
e80711ca MH |
2902 | return -EINVAL; |
2903 | } | |
225466f1 | 2904 | |
2df58634 | 2905 | /* Load symbols with given filter */ |
3c42258c | 2906 | available_func_filter = _filter; |
2df58634 MH |
2907 | if (map__load(map, filter_available_functions)) { |
2908 | pr_err("Failed to load symbols in %s\n", (target) ? : "kernel"); | |
2909 | goto end; | |
2910 | } | |
2911 | if (!dso__sorted_by_name(map->dso, map->type)) | |
2912 | dso__sort_by_name(map->dso, map->type); | |
225466f1 | 2913 | |
2df58634 MH |
2914 | /* Show all (filtered) symbols */ |
2915 | setup_pager(); | |
2916 | dso__fprintf_symbols_by_name(map->dso, map->type, stdout); | |
2917 | end: | |
2918 | if (user) { | |
84c2cafa | 2919 | map__put(map); |
2df58634 | 2920 | } |
9bae1e8c | 2921 | exit_probe_symbol_maps(); |
225466f1 | 2922 | |
2df58634 | 2923 | return ret; |
225466f1 SD |
2924 | } |
2925 | ||
da15bd9d WN |
2926 | int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, |
2927 | struct perf_probe_arg *pvar) | |
2928 | { | |
2929 | tvar->value = strdup(pvar->var); | |
2930 | if (tvar->value == NULL) | |
2931 | return -ENOMEM; | |
2932 | if (pvar->type) { | |
2933 | tvar->type = strdup(pvar->type); | |
2934 | if (tvar->type == NULL) | |
2935 | return -ENOMEM; | |
2936 | } | |
2937 | if (pvar->name) { | |
2938 | tvar->name = strdup(pvar->name); | |
2939 | if (tvar->name == NULL) | |
2940 | return -ENOMEM; | |
2941 | } else | |
2942 | tvar->name = NULL; | |
2943 | return 0; | |
2944 | } |