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Commit | Line | Data |
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50656eec | 1 | /* |
0e60836b | 2 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
3 | * |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
fd20e811 | 22 | #include <inttypes.h> |
50656eec MH |
23 | #include <sys/utsname.h> |
24 | #include <sys/types.h> | |
25 | #include <sys/stat.h> | |
26 | #include <fcntl.h> | |
27 | #include <errno.h> | |
28 | #include <stdio.h> | |
29 | #include <unistd.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
4de189fe MH |
32 | #include <stdarg.h> |
33 | #include <limits.h> | |
e80711ca | 34 | #include <elf.h> |
50656eec | 35 | |
31facc5f | 36 | #include "util.h" |
50656eec | 37 | #include "event.h" |
4de189fe | 38 | #include "strlist.h" |
8ec20b17 | 39 | #include "strfilter.h" |
50656eec | 40 | #include "debug.h" |
72041334 | 41 | #include "cache.h" |
631c9def | 42 | #include "color.h" |
e0faa8d3 MH |
43 | #include "symbol.h" |
44 | #include "thread.h" | |
4605eab3 | 45 | #include <api/fs/fs.h> |
1d037ca1 | 46 | #include "trace-event.h" /* For __maybe_unused */ |
50656eec | 47 | #include "probe-event.h" |
4235b045 | 48 | #include "probe-finder.h" |
92f6c72e | 49 | #include "probe-file.h" |
225466f1 | 50 | #include "session.h" |
a067558e | 51 | #include "string2.h" |
50656eec | 52 | |
3d689ed6 ACM |
53 | #include "sane_ctype.h" |
54 | ||
50656eec MH |
55 | #define PERFPROBE_GROUP "probe" |
56 | ||
f4d7da49 | 57 | bool probe_event_dry_run; /* Dry run flag */ |
ddb2f58f | 58 | struct probe_conf probe_conf; |
f4d7da49 | 59 | |
146a1439 | 60 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 61 | |
92f6c72e | 62 | int e_snprintf(char *str, size_t size, const char *format, ...) |
4de189fe MH |
63 | { |
64 | int ret; | |
65 | va_list ap; | |
66 | va_start(ap, format); | |
67 | ret = vsnprintf(str, size, format, ap); | |
68 | va_end(ap); | |
69 | if (ret >= (int)size) | |
70 | ret = -E2BIG; | |
71 | return ret; | |
72 | } | |
73 | ||
ee45b6c2 | 74 | static struct machine *host_machine; |
e0faa8d3 | 75 | |
469b9b88 | 76 | /* Initialize symbol maps and path of vmlinux/modules */ |
9bae1e8c | 77 | int init_probe_symbol_maps(bool user_only) |
e0faa8d3 | 78 | { |
146a1439 MH |
79 | int ret; |
80 | ||
e0faa8d3 | 81 | symbol_conf.sort_by_name = true; |
680d926a | 82 | symbol_conf.allow_aliases = true; |
0a7e6d1b | 83 | ret = symbol__init(NULL); |
146a1439 MH |
84 | if (ret < 0) { |
85 | pr_debug("Failed to init symbol map.\n"); | |
86 | goto out; | |
87 | } | |
e0faa8d3 | 88 | |
ee45b6c2 MH |
89 | if (host_machine || user_only) /* already initialized */ |
90 | return 0; | |
d28c6223 | 91 | |
ee45b6c2 MH |
92 | if (symbol_conf.vmlinux_name) |
93 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
94 | ||
95 | host_machine = machine__new_host(); | |
96 | if (!host_machine) { | |
97 | pr_debug("machine__new_host() failed.\n"); | |
98 | symbol__exit(); | |
99 | ret = -1; | |
469b9b88 | 100 | } |
146a1439 MH |
101 | out: |
102 | if (ret < 0) | |
103 | pr_warning("Failed to init vmlinux path.\n"); | |
104 | return ret; | |
e0faa8d3 MH |
105 | } |
106 | ||
9bae1e8c | 107 | void exit_probe_symbol_maps(void) |
ee45b6c2 | 108 | { |
32ca678d ACM |
109 | machine__delete(host_machine); |
110 | host_machine = NULL; | |
ee45b6c2 MH |
111 | symbol__exit(); |
112 | } | |
113 | ||
469b9b88 MH |
114 | static struct symbol *__find_kernel_function_by_name(const char *name, |
115 | struct map **mapp) | |
116 | { | |
be39db9f | 117 | return machine__find_kernel_function_by_name(host_machine, name, mapp); |
469b9b88 MH |
118 | } |
119 | ||
8f33f7de MH |
120 | static struct symbol *__find_kernel_function(u64 addr, struct map **mapp) |
121 | { | |
be39db9f | 122 | return machine__find_kernel_function(host_machine, addr, mapp); |
8f33f7de MH |
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 | |
be39db9f | 131 | if (map__load(map) < 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, '/')) | |
eebc509b | 170 | return dso__new_map(module); |
14a8fd7c | 171 | |
e80711ca MH |
172 | if (!module) |
173 | module = "kernel"; | |
174 | ||
4bb7123d | 175 | for (pos = maps__first(maps); pos; pos = map__next(pos)) { |
cb3f3378 | 176 | /* short_name is "[module]" */ |
e80711ca | 177 | if (strncmp(pos->dso->short_name + 1, module, |
cb3f3378 KK |
178 | pos->dso->short_name_len - 2) == 0 && |
179 | module[pos->dso->short_name_len - 2] == '\0') { | |
eebc509b | 180 | map__get(pos); |
e80711ca MH |
181 | return pos; |
182 | } | |
183 | } | |
184 | return NULL; | |
185 | } | |
186 | ||
544abd44 | 187 | struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) |
9b118aca MH |
188 | { |
189 | /* Init maps of given executable or kernel */ | |
544abd44 KJ |
190 | if (user) { |
191 | struct map *map; | |
192 | ||
193 | map = dso__new_map(target); | |
194 | if (map && map->dso) | |
195 | map->dso->nsinfo = nsinfo__get(nsi); | |
196 | return map; | |
197 | } else { | |
9b118aca | 198 | return kernel_get_module_map(target); |
544abd44 | 199 | } |
9b118aca MH |
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 | ||
ead1a574 | 218 | for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) { |
35726d3a MH |
219 | if (!isalnum(*ptr2) && *ptr2 != '_') { |
220 | *ptr2 = '\0'; | |
221 | break; | |
222 | } | |
223 | } | |
224 | ||
fb7345bb MH |
225 | ret = e_snprintf(buf, 64, "%s_%s", PERFPROBE_GROUP, ptr1); |
226 | if (ret < 0) | |
227 | goto out; | |
228 | ||
229 | *result = strdup(buf); | |
230 | ret = *result ? 0 : -ENOMEM; | |
231 | ||
232 | out: | |
233 | free(exec_copy); | |
234 | return ret; | |
235 | } | |
236 | ||
9b118aca MH |
237 | static void clear_perf_probe_point(struct perf_probe_point *pp) |
238 | { | |
239 | free(pp->file); | |
240 | free(pp->function); | |
241 | free(pp->lazy_line); | |
242 | } | |
243 | ||
eb948e50 MH |
244 | static void clear_probe_trace_events(struct probe_trace_event *tevs, int ntevs) |
245 | { | |
246 | int i; | |
247 | ||
248 | for (i = 0; i < ntevs; i++) | |
249 | clear_probe_trace_event(tevs + i); | |
250 | } | |
251 | ||
b031220d MH |
252 | static bool kprobe_blacklist__listed(unsigned long address); |
253 | static bool kprobe_warn_out_range(const char *symbol, unsigned long address) | |
254 | { | |
9b239a12 MH |
255 | u64 etext_addr = 0; |
256 | int ret; | |
7c31bb8c | 257 | |
b031220d | 258 | /* Get the address of _etext for checking non-probable text symbol */ |
9b239a12 MH |
259 | ret = kernel_get_symbol_address_by_name("_etext", &etext_addr, |
260 | false, false); | |
7c31bb8c | 261 | |
9b239a12 | 262 | if (ret == 0 && etext_addr < address) |
b031220d MH |
263 | pr_warning("%s is out of .text, skip it.\n", symbol); |
264 | else if (kprobe_blacklist__listed(address)) | |
265 | pr_warning("%s is blacklisted function, skip it.\n", symbol); | |
266 | else | |
267 | return false; | |
268 | ||
269 | return true; | |
270 | } | |
271 | ||
c61fb959 RB |
272 | /* |
273 | * @module can be module name of module file path. In case of path, | |
274 | * inspect elf and find out what is actual module name. | |
275 | * Caller has to free mod_name after using it. | |
276 | */ | |
277 | static char *find_module_name(const char *module) | |
278 | { | |
279 | int fd; | |
280 | Elf *elf; | |
281 | GElf_Ehdr ehdr; | |
282 | GElf_Shdr shdr; | |
283 | Elf_Data *data; | |
284 | Elf_Scn *sec; | |
285 | char *mod_name = NULL; | |
1f2ed153 | 286 | int name_offset; |
c61fb959 RB |
287 | |
288 | fd = open(module, O_RDONLY); | |
289 | if (fd < 0) | |
290 | return NULL; | |
291 | ||
292 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
293 | if (elf == NULL) | |
294 | goto elf_err; | |
295 | ||
296 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
297 | goto ret_err; | |
298 | ||
299 | sec = elf_section_by_name(elf, &ehdr, &shdr, | |
300 | ".gnu.linkonce.this_module", NULL); | |
301 | if (!sec) | |
302 | goto ret_err; | |
303 | ||
304 | data = elf_getdata(sec, NULL); | |
305 | if (!data || !data->d_buf) | |
306 | goto ret_err; | |
307 | ||
1f2ed153 MH |
308 | /* |
309 | * NOTE: | |
310 | * '.gnu.linkonce.this_module' section of kernel module elf directly | |
311 | * maps to 'struct module' from linux/module.h. This section contains | |
312 | * actual module name which will be used by kernel after loading it. | |
313 | * But, we cannot use 'struct module' here since linux/module.h is not | |
314 | * exposed to user-space. Offset of 'name' has remained same from long | |
315 | * time, so hardcoding it here. | |
316 | */ | |
317 | if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) | |
318 | name_offset = 12; | |
319 | else /* expect ELFCLASS64 by default */ | |
320 | name_offset = 24; | |
321 | ||
322 | mod_name = strdup((char *)data->d_buf + name_offset); | |
c61fb959 RB |
323 | |
324 | ret_err: | |
325 | elf_end(elf); | |
326 | elf_err: | |
327 | close(fd); | |
328 | return mod_name; | |
329 | } | |
330 | ||
89fe808a | 331 | #ifdef HAVE_DWARF_SUPPORT |
60fb7742 WN |
332 | |
333 | static int kernel_get_module_dso(const char *module, struct dso **pdso) | |
334 | { | |
335 | struct dso *dso; | |
336 | struct map *map; | |
337 | const char *vmlinux_name; | |
338 | int ret = 0; | |
339 | ||
340 | if (module) { | |
266fa2b2 ACM |
341 | char module_name[128]; |
342 | ||
343 | snprintf(module_name, sizeof(module_name), "[%s]", module); | |
344 | map = map_groups__find_by_name(&host_machine->kmaps, MAP__FUNCTION, module_name); | |
345 | if (map) { | |
346 | dso = map->dso; | |
347 | goto found; | |
60fb7742 WN |
348 | } |
349 | pr_debug("Failed to find module %s.\n", module); | |
350 | return -ENOENT; | |
351 | } | |
352 | ||
a5e813c6 | 353 | map = machine__kernel_map(host_machine); |
60fb7742 WN |
354 | dso = map->dso; |
355 | ||
356 | vmlinux_name = symbol_conf.vmlinux_name; | |
357 | dso->load_errno = 0; | |
358 | if (vmlinux_name) | |
be39db9f | 359 | ret = dso__load_vmlinux(dso, map, vmlinux_name, false); |
60fb7742 | 360 | else |
be39db9f | 361 | ret = dso__load_vmlinux_path(dso, map); |
60fb7742 WN |
362 | found: |
363 | *pdso = dso; | |
364 | return ret; | |
365 | } | |
366 | ||
9b118aca MH |
367 | /* |
368 | * Some binaries like glibc have special symbols which are on the symbol | |
369 | * table, but not in the debuginfo. If we can find the address of the | |
370 | * symbol from map, we can translate the address back to the probe point. | |
371 | */ | |
372 | static int find_alternative_probe_point(struct debuginfo *dinfo, | |
373 | struct perf_probe_point *pp, | |
374 | struct perf_probe_point *result, | |
544abd44 KJ |
375 | const char *target, struct nsinfo *nsi, |
376 | bool uprobes) | |
9b118aca MH |
377 | { |
378 | struct map *map = NULL; | |
379 | struct symbol *sym; | |
380 | u64 address = 0; | |
381 | int ret = -ENOENT; | |
382 | ||
383 | /* This can work only for function-name based one */ | |
384 | if (!pp->function || pp->file) | |
385 | return -ENOTSUP; | |
386 | ||
544abd44 | 387 | map = get_target_map(target, nsi, uprobes); |
9b118aca MH |
388 | if (!map) |
389 | return -EINVAL; | |
390 | ||
391 | /* Find the address of given function */ | |
392 | map__for_each_symbol_by_name(map, pp->function, sym) { | |
e6d7c91c MH |
393 | if (uprobes) |
394 | address = sym->start; | |
395 | else | |
8e34189b | 396 | address = map->unmap_ip(map, sym->start) - map->reloc; |
e578da3b | 397 | break; |
9b118aca MH |
398 | } |
399 | if (!address) { | |
400 | ret = -ENOENT; | |
401 | goto out; | |
402 | } | |
f6c15621 WN |
403 | pr_debug("Symbol %s address found : %" PRIx64 "\n", |
404 | pp->function, address); | |
9b118aca MH |
405 | |
406 | ret = debuginfo__find_probe_point(dinfo, (unsigned long)address, | |
407 | result); | |
408 | if (ret <= 0) | |
409 | ret = (!ret) ? -ENOENT : ret; | |
410 | else { | |
411 | result->offset += pp->offset; | |
412 | result->line += pp->line; | |
9d7b45c5 | 413 | result->retprobe = pp->retprobe; |
9b118aca MH |
414 | ret = 0; |
415 | } | |
416 | ||
417 | out: | |
eebc509b | 418 | map__put(map); |
9b118aca MH |
419 | return ret; |
420 | ||
421 | } | |
422 | ||
423 | static int get_alternative_probe_event(struct debuginfo *dinfo, | |
424 | struct perf_probe_event *pev, | |
44225521 | 425 | struct perf_probe_point *tmp) |
9b118aca MH |
426 | { |
427 | int ret; | |
428 | ||
429 | memcpy(tmp, &pev->point, sizeof(*tmp)); | |
430 | memset(&pev->point, 0, sizeof(pev->point)); | |
544abd44 KJ |
431 | ret = find_alternative_probe_point(dinfo, tmp, &pev->point, pev->target, |
432 | pev->nsi, pev->uprobes); | |
9b118aca MH |
433 | if (ret < 0) |
434 | memcpy(&pev->point, tmp, sizeof(*tmp)); | |
435 | ||
436 | return ret; | |
437 | } | |
a15ad2f5 | 438 | |
811dd2ae MH |
439 | static int get_alternative_line_range(struct debuginfo *dinfo, |
440 | struct line_range *lr, | |
441 | const char *target, bool user) | |
442 | { | |
6d4a4896 DA |
443 | struct perf_probe_point pp = { .function = lr->function, |
444 | .file = lr->file, | |
445 | .line = lr->start }; | |
446 | struct perf_probe_point result; | |
811dd2ae MH |
447 | int ret, len = 0; |
448 | ||
6d4a4896 DA |
449 | memset(&result, 0, sizeof(result)); |
450 | ||
811dd2ae MH |
451 | if (lr->end != INT_MAX) |
452 | len = lr->end - lr->start; | |
453 | ret = find_alternative_probe_point(dinfo, &pp, &result, | |
544abd44 | 454 | target, NULL, user); |
811dd2ae MH |
455 | if (!ret) { |
456 | lr->function = result.function; | |
457 | lr->file = result.file; | |
458 | lr->start = result.line; | |
459 | if (lr->end != INT_MAX) | |
460 | lr->end = lr->start + len; | |
461 | clear_perf_probe_point(&pp); | |
462 | } | |
463 | return ret; | |
464 | } | |
465 | ||
ff741783 | 466 | /* Open new debuginfo of given module */ |
544abd44 KJ |
467 | static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi, |
468 | bool silent) | |
e0faa8d3 | 469 | { |
a15ad2f5 | 470 | const char *path = module; |
419e8738 MH |
471 | char reason[STRERR_BUFSIZE]; |
472 | struct debuginfo *ret = NULL; | |
473 | struct dso *dso = NULL; | |
544abd44 | 474 | struct nscookie nsc; |
419e8738 | 475 | int err; |
ff741783 | 476 | |
a15ad2f5 | 477 | if (!module || !strchr(module, '/')) { |
419e8738 MH |
478 | err = kernel_get_module_dso(module, &dso); |
479 | if (err < 0) { | |
480 | if (!dso || dso->load_errno == 0) { | |
c8b5f2c9 | 481 | if (!str_error_r(-err, reason, STRERR_BUFSIZE)) |
419e8738 MH |
482 | strcpy(reason, "(unknown)"); |
483 | } else | |
484 | dso__strerror_load(dso, reason, STRERR_BUFSIZE); | |
92561cb7 | 485 | if (!silent) |
419e8738 MH |
486 | pr_err("Failed to find the path for %s: %s\n", |
487 | module ?: "kernel", reason); | |
14a8fd7c MH |
488 | return NULL; |
489 | } | |
419e8738 | 490 | path = dso->long_name; |
e0faa8d3 | 491 | } |
544abd44 | 492 | nsinfo__mountns_enter(nsi, &nsc); |
92561cb7 MH |
493 | ret = debuginfo__new(path); |
494 | if (!ret && !silent) { | |
495 | pr_warning("The %s file has no debug information.\n", path); | |
496 | if (!module || !strtailcmp(path, ".ko")) | |
497 | pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, "); | |
498 | else | |
499 | pr_warning("Rebuild with -g, "); | |
500 | pr_warning("or install an appropriate debuginfo package.\n"); | |
501 | } | |
544abd44 | 502 | nsinfo__mountns_exit(&nsc); |
92561cb7 | 503 | return ret; |
e0faa8d3 | 504 | } |
4b4da7f7 | 505 | |
7737af01 MH |
506 | /* For caching the last debuginfo */ |
507 | static struct debuginfo *debuginfo_cache; | |
508 | static char *debuginfo_cache_path; | |
509 | ||
510 | static struct debuginfo *debuginfo_cache__open(const char *module, bool silent) | |
511 | { | |
20f49859 MH |
512 | const char *path = module; |
513 | ||
514 | /* If the module is NULL, it should be the kernel. */ | |
515 | if (!module) | |
516 | path = "kernel"; | |
517 | ||
518 | if (debuginfo_cache_path && !strcmp(debuginfo_cache_path, path)) | |
7737af01 MH |
519 | goto out; |
520 | ||
521 | /* Copy module path */ | |
522 | free(debuginfo_cache_path); | |
20f49859 MH |
523 | debuginfo_cache_path = strdup(path); |
524 | if (!debuginfo_cache_path) { | |
525 | debuginfo__delete(debuginfo_cache); | |
526 | debuginfo_cache = NULL; | |
527 | goto out; | |
7737af01 MH |
528 | } |
529 | ||
544abd44 | 530 | debuginfo_cache = open_debuginfo(module, NULL, silent); |
7737af01 MH |
531 | if (!debuginfo_cache) |
532 | zfree(&debuginfo_cache_path); | |
533 | out: | |
534 | return debuginfo_cache; | |
535 | } | |
536 | ||
537 | static void debuginfo_cache__exit(void) | |
538 | { | |
539 | debuginfo__delete(debuginfo_cache); | |
540 | debuginfo_cache = NULL; | |
541 | zfree(&debuginfo_cache_path); | |
542 | } | |
543 | ||
92561cb7 | 544 | |
544abd44 KJ |
545 | static int get_text_start_address(const char *exec, unsigned long *address, |
546 | struct nsinfo *nsi) | |
99ca4233 MH |
547 | { |
548 | Elf *elf; | |
549 | GElf_Ehdr ehdr; | |
550 | GElf_Shdr shdr; | |
551 | int fd, ret = -ENOENT; | |
544abd44 | 552 | struct nscookie nsc; |
99ca4233 | 553 | |
544abd44 | 554 | nsinfo__mountns_enter(nsi, &nsc); |
99ca4233 | 555 | fd = open(exec, O_RDONLY); |
544abd44 | 556 | nsinfo__mountns_exit(&nsc); |
99ca4233 MH |
557 | if (fd < 0) |
558 | return -errno; | |
559 | ||
560 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); | |
062d6c2a MH |
561 | if (elf == NULL) { |
562 | ret = -EINVAL; | |
563 | goto out_close; | |
564 | } | |
99ca4233 MH |
565 | |
566 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
567 | goto out; | |
568 | ||
569 | if (!elf_section_by_name(elf, &ehdr, &shdr, ".text", NULL)) | |
570 | goto out; | |
571 | ||
572 | *address = shdr.sh_addr - shdr.sh_offset; | |
573 | ret = 0; | |
574 | out: | |
575 | elf_end(elf); | |
062d6c2a MH |
576 | out_close: |
577 | close(fd); | |
578 | ||
99ca4233 MH |
579 | return ret; |
580 | } | |
581 | ||
5a6f6314 MH |
582 | /* |
583 | * Convert trace point to probe point with debuginfo | |
584 | */ | |
585 | static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp, | |
586 | struct perf_probe_point *pp, | |
587 | bool is_kprobe) | |
588 | { | |
589 | struct debuginfo *dinfo = NULL; | |
590 | unsigned long stext = 0; | |
591 | u64 addr = tp->address; | |
592 | int ret = -ENOENT; | |
593 | ||
594 | /* convert the address to dwarf address */ | |
595 | if (!is_kprobe) { | |
596 | if (!addr) { | |
597 | ret = -EINVAL; | |
598 | goto error; | |
599 | } | |
544abd44 | 600 | ret = get_text_start_address(tp->module, &stext, NULL); |
5a6f6314 MH |
601 | if (ret < 0) |
602 | goto error; | |
603 | addr += stext; | |
e486367f | 604 | } else if (tp->symbol) { |
9b239a12 MH |
605 | /* If the module is given, this returns relative address */ |
606 | ret = kernel_get_symbol_address_by_name(tp->symbol, &addr, | |
607 | false, !!tp->module); | |
608 | if (ret != 0) | |
5a6f6314 MH |
609 | goto error; |
610 | addr += tp->offset; | |
611 | } | |
612 | ||
613 | pr_debug("try to find information at %" PRIx64 " in %s\n", addr, | |
614 | tp->module ? : "kernel"); | |
615 | ||
bb963e16 | 616 | dinfo = debuginfo_cache__open(tp->module, verbose <= 0); |
7737af01 | 617 | if (dinfo) |
5a6f6314 MH |
618 | ret = debuginfo__find_probe_point(dinfo, |
619 | (unsigned long)addr, pp); | |
7737af01 | 620 | else |
5a6f6314 | 621 | ret = -ENOENT; |
5a6f6314 MH |
622 | |
623 | if (ret > 0) { | |
624 | pp->retprobe = tp->retprobe; | |
625 | return 0; | |
626 | } | |
627 | error: | |
628 | pr_debug("Failed to find corresponding probes from debuginfo.\n"); | |
629 | return ret ? : -ENOENT; | |
630 | } | |
631 | ||
3e96dac7 MH |
632 | /* Adjust symbol name and address */ |
633 | static int post_process_probe_trace_point(struct probe_trace_point *tp, | |
634 | struct map *map, unsigned long offs) | |
635 | { | |
636 | struct symbol *sym; | |
7598f8bc | 637 | u64 addr = tp->address - offs; |
3e96dac7 MH |
638 | |
639 | sym = map__find_symbol(map, addr); | |
640 | if (!sym) | |
641 | return -ENOENT; | |
642 | ||
643 | if (strcmp(sym->name, tp->symbol)) { | |
644 | /* If we have no realname, use symbol for it */ | |
645 | if (!tp->realname) | |
646 | tp->realname = tp->symbol; | |
647 | else | |
648 | free(tp->symbol); | |
649 | tp->symbol = strdup(sym->name); | |
650 | if (!tp->symbol) | |
651 | return -ENOMEM; | |
652 | } | |
653 | tp->offset = addr - sym->start; | |
654 | tp->address -= offs; | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
8a937a25 MH |
659 | /* |
660 | * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions | |
661 | * and generate new symbols with suffixes such as .constprop.N or .isra.N | |
662 | * etc. Since those symbols are not recorded in DWARF, we have to find | |
663 | * correct generated symbols from offline ELF binary. | |
664 | * For online kernel or uprobes we don't need this because those are | |
665 | * rebased on _text, or already a section relative address. | |
666 | */ | |
667 | static int | |
668 | post_process_offline_probe_trace_events(struct probe_trace_event *tevs, | |
669 | int ntevs, const char *pathname) | |
670 | { | |
8a937a25 MH |
671 | struct map *map; |
672 | unsigned long stext = 0; | |
3e96dac7 | 673 | int i, ret = 0; |
8a937a25 MH |
674 | |
675 | /* Prepare a map for offline binary */ | |
676 | map = dso__new_map(pathname); | |
544abd44 | 677 | if (!map || get_text_start_address(pathname, &stext, NULL) < 0) { |
8a937a25 MH |
678 | pr_warning("Failed to get ELF symbols for %s\n", pathname); |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | for (i = 0; i < ntevs; i++) { | |
3e96dac7 MH |
683 | ret = post_process_probe_trace_point(&tevs[i].point, |
684 | map, stext); | |
685 | if (ret < 0) | |
686 | break; | |
8a937a25 MH |
687 | } |
688 | map__put(map); | |
689 | ||
3e96dac7 | 690 | return ret; |
8a937a25 MH |
691 | } |
692 | ||
fb7345bb | 693 | static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs, |
544abd44 KJ |
694 | int ntevs, const char *exec, |
695 | struct nsinfo *nsi) | |
fb7345bb MH |
696 | { |
697 | int i, ret = 0; | |
eb948e50 | 698 | unsigned long stext = 0; |
fb7345bb MH |
699 | |
700 | if (!exec) | |
701 | return 0; | |
702 | ||
544abd44 | 703 | ret = get_text_start_address(exec, &stext, nsi); |
fb7345bb MH |
704 | if (ret < 0) |
705 | return ret; | |
706 | ||
707 | for (i = 0; i < ntevs && ret >= 0; i++) { | |
981a2379 | 708 | /* point.address is the addres of point.symbol + point.offset */ |
eb948e50 | 709 | tevs[i].point.address -= stext; |
fb7345bb | 710 | tevs[i].point.module = strdup(exec); |
eb948e50 | 711 | if (!tevs[i].point.module) { |
fb7345bb MH |
712 | ret = -ENOMEM; |
713 | break; | |
714 | } | |
715 | tevs[i].uprobes = true; | |
716 | } | |
717 | ||
718 | return ret; | |
719 | } | |
720 | ||
613f050d MH |
721 | static int |
722 | post_process_module_probe_trace_events(struct probe_trace_event *tevs, | |
723 | int ntevs, const char *module, | |
724 | struct debuginfo *dinfo) | |
190b57fc | 725 | { |
613f050d | 726 | Dwarf_Addr text_offs = 0; |
14a8fd7c | 727 | int i, ret = 0; |
63a29613 | 728 | char *mod_name = NULL; |
613f050d | 729 | struct map *map; |
14a8fd7c MH |
730 | |
731 | if (!module) | |
732 | return 0; | |
733 | ||
544abd44 | 734 | map = get_target_map(module, NULL, false); |
613f050d MH |
735 | if (!map || debuginfo__get_text_offset(dinfo, &text_offs, true) < 0) { |
736 | pr_warning("Failed to get ELF symbols for %s\n", module); | |
737 | return -EINVAL; | |
738 | } | |
14a8fd7c | 739 | |
613f050d | 740 | mod_name = find_module_name(module); |
190b57fc | 741 | for (i = 0; i < ntevs; i++) { |
613f050d MH |
742 | ret = post_process_probe_trace_point(&tevs[i].point, |
743 | map, (unsigned long)text_offs); | |
744 | if (ret < 0) | |
745 | break; | |
63a29613 RB |
746 | tevs[i].point.module = |
747 | strdup(mod_name ? mod_name : module); | |
14a8fd7c MH |
748 | if (!tevs[i].point.module) { |
749 | ret = -ENOMEM; | |
750 | break; | |
751 | } | |
190b57fc | 752 | } |
14a8fd7c | 753 | |
63a29613 | 754 | free(mod_name); |
613f050d MH |
755 | map__put(map); |
756 | ||
14a8fd7c | 757 | return ret; |
190b57fc MH |
758 | } |
759 | ||
d820456d RB |
760 | static int |
761 | post_process_kernel_probe_trace_events(struct probe_trace_event *tevs, | |
762 | int ntevs) | |
dfef99cd MH |
763 | { |
764 | struct ref_reloc_sym *reloc_sym; | |
765 | char *tmp; | |
5a51fcd1 | 766 | int i, skipped = 0; |
dfef99cd | 767 | |
428aff82 MH |
768 | /* Skip post process if the target is an offline kernel */ |
769 | if (symbol_conf.ignore_vmlinux_buildid) | |
8a937a25 MH |
770 | return post_process_offline_probe_trace_events(tevs, ntevs, |
771 | symbol_conf.vmlinux_name); | |
428aff82 | 772 | |
8f33f7de | 773 | reloc_sym = kernel_get_ref_reloc_sym(); |
dfef99cd MH |
774 | if (!reloc_sym) { |
775 | pr_warning("Relocated base symbol is not found!\n"); | |
776 | return -EINVAL; | |
777 | } | |
778 | ||
779 | for (i = 0; i < ntevs; i++) { | |
7ab31d94 NR |
780 | if (!tevs[i].point.address) |
781 | continue; | |
782 | if (tevs[i].point.retprobe && !kretprobe_offset_is_supported()) | |
b031220d MH |
783 | continue; |
784 | /* If we found a wrong one, mark it by NULL symbol */ | |
785 | if (kprobe_warn_out_range(tevs[i].point.symbol, | |
786 | tevs[i].point.address)) { | |
787 | tmp = NULL; | |
788 | skipped++; | |
789 | } else { | |
790 | tmp = strdup(reloc_sym->name); | |
791 | if (!tmp) | |
792 | return -ENOMEM; | |
dfef99cd | 793 | } |
b031220d MH |
794 | /* If we have no realname, use symbol for it */ |
795 | if (!tevs[i].point.realname) | |
796 | tevs[i].point.realname = tevs[i].point.symbol; | |
797 | else | |
798 | free(tevs[i].point.symbol); | |
799 | tevs[i].point.symbol = tmp; | |
800 | tevs[i].point.offset = tevs[i].point.address - | |
801 | reloc_sym->unrelocated_addr; | |
dfef99cd | 802 | } |
5a51fcd1 | 803 | return skipped; |
dfef99cd MH |
804 | } |
805 | ||
99e608b5 RB |
806 | void __weak |
807 | arch__post_process_probe_trace_events(struct perf_probe_event *pev __maybe_unused, | |
808 | int ntevs __maybe_unused) | |
809 | { | |
810 | } | |
811 | ||
d820456d | 812 | /* Post processing the probe events */ |
99e608b5 RB |
813 | static int post_process_probe_trace_events(struct perf_probe_event *pev, |
814 | struct probe_trace_event *tevs, | |
d820456d | 815 | int ntevs, const char *module, |
613f050d | 816 | bool uprobe, struct debuginfo *dinfo) |
d820456d | 817 | { |
99e608b5 | 818 | int ret; |
d820456d | 819 | |
99e608b5 | 820 | if (uprobe) |
544abd44 KJ |
821 | ret = add_exec_to_probe_trace_events(tevs, ntevs, module, |
822 | pev->nsi); | |
99e608b5 | 823 | else if (module) |
d820456d | 824 | /* Currently ref_reloc_sym based probe is not for drivers */ |
613f050d MH |
825 | ret = post_process_module_probe_trace_events(tevs, ntevs, |
826 | module, dinfo); | |
99e608b5 RB |
827 | else |
828 | ret = post_process_kernel_probe_trace_events(tevs, ntevs); | |
d820456d | 829 | |
99e608b5 RB |
830 | if (ret >= 0) |
831 | arch__post_process_probe_trace_events(pev, ntevs); | |
832 | ||
833 | return ret; | |
d820456d RB |
834 | } |
835 | ||
4b4da7f7 | 836 | /* Try to find perf_probe_event with debuginfo */ |
0e60836b | 837 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 838 | struct probe_trace_event **tevs) |
4b4da7f7 MH |
839 | { |
840 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
9b118aca | 841 | struct perf_probe_point tmp; |
225466f1 | 842 | struct debuginfo *dinfo; |
190b57fc | 843 | int ntevs, ret = 0; |
4b4da7f7 | 844 | |
544abd44 | 845 | dinfo = open_debuginfo(pev->target, pev->nsi, !need_dwarf); |
ff741783 | 846 | if (!dinfo) { |
92561cb7 | 847 | if (need_dwarf) |
ff741783 | 848 | return -ENOENT; |
ff741783 | 849 | pr_debug("Could not open debuginfo. Try to use symbols.\n"); |
4b4da7f7 MH |
850 | return 0; |
851 | } | |
852 | ||
dfef99cd | 853 | pr_debug("Try to find probe point from debuginfo.\n"); |
ff741783 | 854 | /* Searching trace events corresponding to a probe event */ |
ddb2f58f | 855 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
ff741783 | 856 | |
9b118aca | 857 | if (ntevs == 0) { /* Not found, retry with an alternative */ |
44225521 | 858 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca | 859 | if (!ret) { |
ddb2f58f | 860 | ntevs = debuginfo__find_trace_events(dinfo, pev, tevs); |
9b118aca MH |
861 | /* |
862 | * Write back to the original probe_event for | |
863 | * setting appropriate (user given) event name | |
864 | */ | |
865 | clear_perf_probe_point(&pev->point); | |
866 | memcpy(&pev->point, &tmp, sizeof(tmp)); | |
867 | } | |
868 | } | |
869 | ||
146a1439 | 870 | if (ntevs > 0) { /* Succeeded to find trace events */ |
dfef99cd | 871 | pr_debug("Found %d probe_trace_events.\n", ntevs); |
99e608b5 | 872 | ret = post_process_probe_trace_events(pev, *tevs, ntevs, |
613f050d | 873 | pev->target, pev->uprobes, dinfo); |
5a51fcd1 | 874 | if (ret < 0 || ret == ntevs) { |
613f050d | 875 | pr_debug("Post processing failed or all events are skipped. (%d)\n", ret); |
981d05ad MH |
876 | clear_probe_trace_events(*tevs, ntevs); |
877 | zfree(tevs); | |
613f050d | 878 | ntevs = 0; |
981d05ad | 879 | } |
146a1439 | 880 | } |
4b4da7f7 | 881 | |
613f050d MH |
882 | debuginfo__delete(dinfo); |
883 | ||
146a1439 | 884 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
0687eba7 | 885 | pr_warning("Probe point '%s' not found.\n", |
146a1439 | 886 | synthesize_perf_probe_point(&pev->point)); |
0687eba7 | 887 | return -ENOENT; |
613f050d MH |
888 | } else if (ntevs < 0) { |
889 | /* Error path : ntevs < 0 */ | |
890 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); | |
1c0bd0e8 WN |
891 | if (ntevs == -EBADF) |
892 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
893 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
15eca306 | 894 | if (!need_dwarf) { |
0e43e5d2 | 895 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
896 | return 0; |
897 | } | |
4b4da7f7 | 898 | } |
15eca306 | 899 | return ntevs; |
4b4da7f7 MH |
900 | } |
901 | ||
902 | #define LINEBUF_SIZE 256 | |
903 | #define NR_ADDITIONAL_LINES 2 | |
904 | ||
fde52dbd | 905 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 | 906 | { |
5f03cba4 | 907 | char buf[LINEBUF_SIZE], sbuf[STRERR_BUFSIZE]; |
befe3414 FBH |
908 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
909 | const char *prefix = NULL; | |
4b4da7f7 | 910 | |
befe3414 | 911 | do { |
4b4da7f7 MH |
912 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
913 | goto error; | |
befe3414 FBH |
914 | if (skip) |
915 | continue; | |
916 | if (!prefix) { | |
917 | prefix = show_num ? "%7d " : " "; | |
918 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 919 | } |
befe3414 FBH |
920 | color_fprintf(stdout, color, "%s", buf); |
921 | ||
922 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 923 | |
fde52dbd | 924 | return 1; |
4b4da7f7 | 925 | error: |
fde52dbd | 926 | if (ferror(fp)) { |
5f03cba4 | 927 | pr_warning("File read error: %s\n", |
c8b5f2c9 | 928 | str_error_r(errno, sbuf, sizeof(sbuf))); |
fde52dbd FBH |
929 | return -1; |
930 | } | |
931 | return 0; | |
932 | } | |
146a1439 | 933 | |
fde52dbd FBH |
934 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
935 | { | |
936 | int rv = __show_one_line(fp, l, skip, show_num); | |
937 | if (rv == 0) { | |
938 | pr_warning("Source file is shorter than expected.\n"); | |
939 | rv = -1; | |
940 | } | |
941 | return rv; | |
4b4da7f7 MH |
942 | } |
943 | ||
fde52dbd FBH |
944 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
945 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
946 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
947 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
948 | ||
4b4da7f7 MH |
949 | /* |
950 | * Show line-range always requires debuginfo to find source file and | |
951 | * line number. | |
952 | */ | |
811dd2ae MH |
953 | static int __show_line_range(struct line_range *lr, const char *module, |
954 | bool user) | |
4b4da7f7 | 955 | { |
d3b63d7a | 956 | int l = 1; |
5a62257a | 957 | struct int_node *ln; |
ff741783 | 958 | struct debuginfo *dinfo; |
4b4da7f7 | 959 | FILE *fp; |
ff741783 | 960 | int ret; |
7cf0b79e | 961 | char *tmp; |
5f03cba4 | 962 | char sbuf[STRERR_BUFSIZE]; |
4b4da7f7 MH |
963 | |
964 | /* Search a line range */ | |
544abd44 | 965 | dinfo = open_debuginfo(module, NULL, false); |
92561cb7 | 966 | if (!dinfo) |
ff741783 | 967 | return -ENOENT; |
146a1439 | 968 | |
ff741783 | 969 | ret = debuginfo__find_line_range(dinfo, lr); |
811dd2ae MH |
970 | if (!ret) { /* Not found, retry with an alternative */ |
971 | ret = get_alternative_line_range(dinfo, lr, module, user); | |
972 | if (!ret) | |
973 | ret = debuginfo__find_line_range(dinfo, lr); | |
974 | } | |
ff741783 | 975 | debuginfo__delete(dinfo); |
5ee05b88 | 976 | if (ret == 0 || ret == -ENOENT) { |
146a1439 MH |
977 | pr_warning("Specified source line is not found.\n"); |
978 | return -ENOENT; | |
979 | } else if (ret < 0) { | |
5ee05b88 | 980 | pr_warning("Debuginfo analysis failed.\n"); |
146a1439 MH |
981 | return ret; |
982 | } | |
4b4da7f7 | 983 | |
7cf0b79e MH |
984 | /* Convert source file path */ |
985 | tmp = lr->path; | |
6a330a3c | 986 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
a78604de HK |
987 | |
988 | /* Free old path when new path is assigned */ | |
989 | if (tmp != lr->path) | |
990 | free(tmp); | |
991 | ||
7cf0b79e | 992 | if (ret < 0) { |
5ee05b88 | 993 | pr_warning("Failed to find source file path.\n"); |
7cf0b79e MH |
994 | return ret; |
995 | } | |
996 | ||
4b4da7f7 MH |
997 | setup_pager(); |
998 | ||
999 | if (lr->function) | |
8737ebde | 1000 | fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path, |
4b4da7f7 MH |
1001 | lr->start - lr->offset); |
1002 | else | |
62c15fc4 | 1003 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
1004 | |
1005 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
1006 | if (fp == NULL) { |
1007 | pr_warning("Failed to open %s: %s\n", lr->path, | |
c8b5f2c9 | 1008 | str_error_r(errno, sbuf, sizeof(sbuf))); |
146a1439 MH |
1009 | return -errno; |
1010 | } | |
4b4da7f7 | 1011 | /* Skip to starting line number */ |
44b81e92 | 1012 | while (l < lr->start) { |
fde52dbd | 1013 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
1014 | if (ret < 0) |
1015 | goto end; | |
1016 | } | |
4b4da7f7 | 1017 | |
10daf4d0 | 1018 | intlist__for_each_entry(ln, lr->line_list) { |
5a62257a | 1019 | for (; ln->i > l; l++) { |
fde52dbd | 1020 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
1021 | if (ret < 0) |
1022 | goto end; | |
1023 | } | |
fde52dbd | 1024 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
1025 | if (ret < 0) |
1026 | goto end; | |
4b4da7f7 MH |
1027 | } |
1028 | ||
1029 | if (lr->end == INT_MAX) | |
1030 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
1031 | while (l <= lr->end) { |
1032 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
1033 | if (ret <= 0) | |
44b81e92 FBH |
1034 | break; |
1035 | } | |
146a1439 | 1036 | end: |
4b4da7f7 | 1037 | fclose(fp); |
146a1439 | 1038 | return ret; |
4b4da7f7 MH |
1039 | } |
1040 | ||
544abd44 KJ |
1041 | int show_line_range(struct line_range *lr, const char *module, |
1042 | struct nsinfo *nsi, bool user) | |
ee45b6c2 MH |
1043 | { |
1044 | int ret; | |
544abd44 | 1045 | struct nscookie nsc; |
ee45b6c2 | 1046 | |
9bae1e8c | 1047 | ret = init_probe_symbol_maps(user); |
ee45b6c2 MH |
1048 | if (ret < 0) |
1049 | return ret; | |
544abd44 | 1050 | nsinfo__mountns_enter(nsi, &nsc); |
811dd2ae | 1051 | ret = __show_line_range(lr, module, user); |
544abd44 | 1052 | nsinfo__mountns_exit(&nsc); |
9bae1e8c | 1053 | exit_probe_symbol_maps(); |
ee45b6c2 MH |
1054 | |
1055 | return ret; | |
1056 | } | |
1057 | ||
ff741783 MH |
1058 | static int show_available_vars_at(struct debuginfo *dinfo, |
1059 | struct perf_probe_event *pev, | |
ddb2f58f | 1060 | struct strfilter *_filter) |
cf6eb489 MH |
1061 | { |
1062 | char *buf; | |
bd09d7b5 | 1063 | int ret, i, nvars; |
cf6eb489 MH |
1064 | struct str_node *node; |
1065 | struct variable_list *vls = NULL, *vl; | |
9b118aca | 1066 | struct perf_probe_point tmp; |
bd09d7b5 | 1067 | const char *var; |
cf6eb489 MH |
1068 | |
1069 | buf = synthesize_perf_probe_point(&pev->point); | |
1070 | if (!buf) | |
1071 | return -EINVAL; | |
1072 | pr_debug("Searching variables at %s\n", buf); | |
1073 | ||
ddb2f58f | 1074 | ret = debuginfo__find_available_vars_at(dinfo, pev, &vls); |
9b118aca | 1075 | if (!ret) { /* Not found, retry with an alternative */ |
44225521 | 1076 | ret = get_alternative_probe_event(dinfo, pev, &tmp); |
9b118aca MH |
1077 | if (!ret) { |
1078 | ret = debuginfo__find_available_vars_at(dinfo, pev, | |
ddb2f58f | 1079 | &vls); |
9b118aca MH |
1080 | /* Release the old probe_point */ |
1081 | clear_perf_probe_point(&tmp); | |
1082 | } | |
1083 | } | |
bd09d7b5 | 1084 | if (ret <= 0) { |
69e96eaa MH |
1085 | if (ret == 0 || ret == -ENOENT) { |
1086 | pr_err("Failed to find the address of %s\n", buf); | |
1087 | ret = -ENOENT; | |
1088 | } else | |
1089 | pr_warning("Debuginfo analysis failed.\n"); | |
bd09d7b5 MH |
1090 | goto end; |
1091 | } | |
69e96eaa | 1092 | |
bd09d7b5 MH |
1093 | /* Some variables are found */ |
1094 | fprintf(stdout, "Available variables at %s\n", buf); | |
1095 | for (i = 0; i < ret; i++) { | |
1096 | vl = &vls[i]; | |
1097 | /* | |
1098 | * A probe point might be converted to | |
1099 | * several trace points. | |
1100 | */ | |
1101 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
1102 | vl->point.offset); | |
74cf249d | 1103 | zfree(&vl->point.symbol); |
bd09d7b5 MH |
1104 | nvars = 0; |
1105 | if (vl->vars) { | |
602a1f4d | 1106 | strlist__for_each_entry(node, vl->vars) { |
bd09d7b5 MH |
1107 | var = strchr(node->s, '\t') + 1; |
1108 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 1109 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
1110 | nvars++; |
1111 | } | |
1112 | } | |
1113 | strlist__delete(vl->vars); | |
cf6eb489 | 1114 | } |
bd09d7b5 MH |
1115 | if (nvars == 0) |
1116 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
1117 | } | |
1118 | free(vls); | |
1119 | end: | |
cf6eb489 MH |
1120 | free(buf); |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | /* Show available variables on given probe point */ | |
1125 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
ddb2f58f | 1126 | struct strfilter *_filter) |
cf6eb489 | 1127 | { |
ff741783 MH |
1128 | int i, ret = 0; |
1129 | struct debuginfo *dinfo; | |
cf6eb489 | 1130 | |
9bae1e8c | 1131 | ret = init_probe_symbol_maps(pevs->uprobes); |
cf6eb489 MH |
1132 | if (ret < 0) |
1133 | return ret; | |
1134 | ||
544abd44 | 1135 | dinfo = open_debuginfo(pevs->target, pevs->nsi, false); |
ff741783 | 1136 | if (!dinfo) { |
ee45b6c2 MH |
1137 | ret = -ENOENT; |
1138 | goto out; | |
ff741783 MH |
1139 | } |
1140 | ||
cf6eb489 MH |
1141 | setup_pager(); |
1142 | ||
ff741783 | 1143 | for (i = 0; i < npevs && ret >= 0; i++) |
ddb2f58f | 1144 | ret = show_available_vars_at(dinfo, &pevs[i], _filter); |
ff741783 MH |
1145 | |
1146 | debuginfo__delete(dinfo); | |
ee45b6c2 | 1147 | out: |
9bae1e8c | 1148 | exit_probe_symbol_maps(); |
cf6eb489 MH |
1149 | return ret; |
1150 | } | |
1151 | ||
89fe808a | 1152 | #else /* !HAVE_DWARF_SUPPORT */ |
4b4da7f7 | 1153 | |
7737af01 MH |
1154 | static void debuginfo_cache__exit(void) |
1155 | { | |
1156 | } | |
1157 | ||
5a6f6314 MH |
1158 | static int |
1159 | find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused, | |
1160 | struct perf_probe_point *pp __maybe_unused, | |
1161 | bool is_kprobe __maybe_unused) | |
4b4da7f7 | 1162 | { |
5a6f6314 | 1163 | return -ENOSYS; |
4b4da7f7 MH |
1164 | } |
1165 | ||
0e60836b | 1166 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 1167 | struct probe_trace_event **tevs __maybe_unused) |
4b4da7f7 | 1168 | { |
146a1439 MH |
1169 | if (perf_probe_event_need_dwarf(pev)) { |
1170 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1171 | return -ENOSYS; | |
1172 | } | |
225466f1 | 1173 | |
4b4da7f7 MH |
1174 | return 0; |
1175 | } | |
1176 | ||
1d037ca1 | 1177 | int show_line_range(struct line_range *lr __maybe_unused, |
2b394bc4 | 1178 | const char *module __maybe_unused, |
544abd44 | 1179 | struct nsinfo *nsi __maybe_unused, |
2b394bc4 | 1180 | bool user __maybe_unused) |
4b4da7f7 | 1181 | { |
146a1439 MH |
1182 | pr_warning("Debuginfo-analysis is not supported.\n"); |
1183 | return -ENOSYS; | |
4b4da7f7 MH |
1184 | } |
1185 | ||
1d037ca1 | 1186 | int show_available_vars(struct perf_probe_event *pevs __maybe_unused, |
ddb2f58f MH |
1187 | int npevs __maybe_unused, |
1188 | struct strfilter *filter __maybe_unused) | |
cf6eb489 MH |
1189 | { |
1190 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
1191 | return -ENOSYS; | |
1192 | } | |
e0faa8d3 MH |
1193 | #endif |
1194 | ||
e53b00d3 MH |
1195 | void line_range__clear(struct line_range *lr) |
1196 | { | |
e53b00d3 MH |
1197 | free(lr->function); |
1198 | free(lr->file); | |
1199 | free(lr->path); | |
1200 | free(lr->comp_dir); | |
5a62257a | 1201 | intlist__delete(lr->line_list); |
e53b00d3 MH |
1202 | memset(lr, 0, sizeof(*lr)); |
1203 | } | |
1204 | ||
5a62257a | 1205 | int line_range__init(struct line_range *lr) |
e53b00d3 MH |
1206 | { |
1207 | memset(lr, 0, sizeof(*lr)); | |
5a62257a MH |
1208 | lr->line_list = intlist__new(NULL); |
1209 | if (!lr->line_list) | |
1210 | return -ENOMEM; | |
1211 | else | |
1212 | return 0; | |
e53b00d3 MH |
1213 | } |
1214 | ||
21dd9ae5 FBH |
1215 | static int parse_line_num(char **ptr, int *val, const char *what) |
1216 | { | |
1217 | const char *start = *ptr; | |
1218 | ||
1219 | errno = 0; | |
1220 | *val = strtol(*ptr, ptr, 0); | |
1221 | if (errno || *ptr == start) { | |
1222 | semantic_error("'%s' is not a valid number.\n", what); | |
1223 | return -EINVAL; | |
1224 | } | |
1225 | return 0; | |
1226 | } | |
1227 | ||
573709fd MH |
1228 | /* Check the name is good for event, group or function */ |
1229 | static bool is_c_func_name(const char *name) | |
1230 | { | |
1231 | if (!isalpha(*name) && *name != '_') | |
1232 | return false; | |
1233 | while (*++name != '\0') { | |
1234 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1235 | return false; | |
1236 | } | |
1237 | return true; | |
1238 | } | |
1239 | ||
9d95b580 FBH |
1240 | /* |
1241 | * Stuff 'lr' according to the line range described by 'arg'. | |
1242 | * The line range syntax is described by: | |
1243 | * | |
1244 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 1245 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 1246 | */ |
146a1439 | 1247 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 1248 | { |
e116dfa1 | 1249 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
1250 | int err; |
1251 | ||
1252 | if (!name) | |
1253 | return -ENOMEM; | |
1254 | ||
1255 | lr->start = 0; | |
1256 | lr->end = INT_MAX; | |
1257 | ||
1258 | range = strchr(name, ':'); | |
1259 | if (range) { | |
1260 | *range++ = '\0'; | |
1261 | ||
1262 | err = parse_line_num(&range, &lr->start, "start line"); | |
1263 | if (err) | |
1264 | goto err; | |
1265 | ||
1266 | if (*range == '+' || *range == '-') { | |
1267 | const char c = *range++; | |
1268 | ||
1269 | err = parse_line_num(&range, &lr->end, "end line"); | |
1270 | if (err) | |
1271 | goto err; | |
1272 | ||
1273 | if (c == '+') { | |
1274 | lr->end += lr->start; | |
1275 | /* | |
1276 | * Adjust the number of lines here. | |
1277 | * If the number of lines == 1, the | |
1278 | * the end of line should be equal to | |
1279 | * the start of line. | |
1280 | */ | |
1281 | lr->end--; | |
1282 | } | |
1283 | } | |
9d95b580 | 1284 | |
d3b63d7a | 1285 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
1286 | |
1287 | err = -EINVAL; | |
d3b63d7a | 1288 | if (lr->start > lr->end) { |
631c9def | 1289 | semantic_error("Start line must be smaller" |
146a1439 | 1290 | " than end line.\n"); |
21dd9ae5 | 1291 | goto err; |
146a1439 | 1292 | } |
21dd9ae5 FBH |
1293 | if (*range != '\0') { |
1294 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
1295 | goto err; | |
146a1439 | 1296 | } |
d3b63d7a | 1297 | } |
02b95dad | 1298 | |
e116dfa1 MH |
1299 | file = strchr(name, '@'); |
1300 | if (file) { | |
1301 | *file = '\0'; | |
1302 | lr->file = strdup(++file); | |
1303 | if (lr->file == NULL) { | |
1304 | err = -ENOMEM; | |
1305 | goto err; | |
1306 | } | |
1307 | lr->function = name; | |
573709fd | 1308 | } else if (strchr(name, '/') || strchr(name, '.')) |
21dd9ae5 | 1309 | lr->file = name; |
573709fd | 1310 | else if (is_c_func_name(name))/* We reuse it for checking funcname */ |
21dd9ae5 | 1311 | lr->function = name; |
573709fd MH |
1312 | else { /* Invalid name */ |
1313 | semantic_error("'%s' is not a valid function name.\n", name); | |
1314 | err = -EINVAL; | |
1315 | goto err; | |
1316 | } | |
146a1439 MH |
1317 | |
1318 | return 0; | |
21dd9ae5 FBH |
1319 | err: |
1320 | free(name); | |
1321 | return err; | |
631c9def MH |
1322 | } |
1323 | ||
36a009fe MH |
1324 | static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev) |
1325 | { | |
1326 | char *ptr; | |
1327 | ||
c588d158 | 1328 | ptr = strpbrk_esc(*arg, ":"); |
36a009fe MH |
1329 | if (ptr) { |
1330 | *ptr = '\0'; | |
42bba263 | 1331 | if (!pev->sdt && !is_c_func_name(*arg)) |
36a009fe | 1332 | goto ng_name; |
c588d158 | 1333 | pev->group = strdup_esc(*arg); |
36a009fe MH |
1334 | if (!pev->group) |
1335 | return -ENOMEM; | |
1336 | *arg = ptr + 1; | |
1337 | } else | |
1338 | pev->group = NULL; | |
c588d158 MH |
1339 | |
1340 | pev->event = strdup_esc(*arg); | |
1341 | if (pev->event == NULL) | |
1342 | return -ENOMEM; | |
1343 | ||
1344 | if (!pev->sdt && !is_c_func_name(pev->event)) { | |
1345 | zfree(&pev->event); | |
36a009fe | 1346 | ng_name: |
c588d158 | 1347 | zfree(&pev->group); |
36a009fe MH |
1348 | semantic_error("%s is bad for event name -it must " |
1349 | "follow C symbol-naming rule.\n", *arg); | |
1350 | return -EINVAL; | |
1351 | } | |
36a009fe MH |
1352 | return 0; |
1353 | } | |
1354 | ||
50656eec | 1355 | /* Parse probepoint definition. */ |
146a1439 | 1356 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 1357 | { |
4235b045 | 1358 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
1359 | char *ptr, *tmp; |
1360 | char c, nc = 0; | |
3099c026 | 1361 | bool file_spec = false; |
36a009fe MH |
1362 | int ret; |
1363 | ||
50656eec MH |
1364 | /* |
1365 | * <Syntax> | |
8d993d96 MH |
1366 | * perf probe [GRP:][EVENT=]SRC[:LN|;PTN] |
1367 | * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
36a009fe | 1368 | * perf probe %[GRP:]SDT_EVENT |
50656eec | 1369 | */ |
e59d29e8 WN |
1370 | if (!arg) |
1371 | return -EINVAL; | |
50656eec | 1372 | |
af9100ad | 1373 | if (is_sdt_event(arg)) { |
36a009fe | 1374 | pev->sdt = true; |
7e9fca51 MH |
1375 | if (arg[0] == '%') |
1376 | arg++; | |
36a009fe MH |
1377 | } |
1378 | ||
c588d158 | 1379 | ptr = strpbrk_esc(arg, ";=@+%"); |
36a009fe | 1380 | if (pev->sdt) { |
8d993d96 | 1381 | if (ptr) { |
a598180a MH |
1382 | if (*ptr != '@') { |
1383 | semantic_error("%s must be an SDT name.\n", | |
1384 | arg); | |
1385 | return -EINVAL; | |
1386 | } | |
1387 | /* This must be a target file name or build id */ | |
1388 | tmp = build_id_cache__complement(ptr + 1); | |
1389 | if (tmp) { | |
1390 | pev->target = build_id_cache__origname(tmp); | |
1391 | free(tmp); | |
1392 | } else | |
c588d158 | 1393 | pev->target = strdup_esc(ptr + 1); |
a598180a MH |
1394 | if (!pev->target) |
1395 | return -ENOMEM; | |
1396 | *ptr = '\0'; | |
146a1439 | 1397 | } |
36a009fe MH |
1398 | ret = parse_perf_probe_event_name(&arg, pev); |
1399 | if (ret == 0) { | |
1400 | if (asprintf(&pev->point.function, "%%%s", pev->event) < 0) | |
1401 | ret = -errno; | |
1402 | } | |
1403 | return ret; | |
1404 | } | |
1405 | ||
1406 | if (ptr && *ptr == '=') { /* Event name */ | |
1407 | *ptr = '\0'; | |
1408 | tmp = ptr + 1; | |
1409 | ret = parse_perf_probe_event_name(&arg, pev); | |
1410 | if (ret < 0) | |
1411 | return ret; | |
1412 | ||
af663d75 MH |
1413 | arg = tmp; |
1414 | } | |
1415 | ||
3099c026 NR |
1416 | /* |
1417 | * Check arg is function or file name and copy it. | |
1418 | * | |
1419 | * We consider arg to be a file spec if and only if it satisfies | |
1420 | * all of the below criteria:: | |
1421 | * - it does not include any of "+@%", | |
1422 | * - it includes one of ":;", and | |
1423 | * - it has a period '.' in the name. | |
1424 | * | |
1425 | * Otherwise, we consider arg to be a function specification. | |
1426 | */ | |
c588d158 MH |
1427 | if (!strpbrk_esc(arg, "+@%")) { |
1428 | ptr = strpbrk_esc(arg, ";:"); | |
3099c026 | 1429 | /* This is a file spec if it includes a '.' before ; or : */ |
c588d158 | 1430 | if (ptr && memchr(arg, '.', ptr - arg)) |
3099c026 NR |
1431 | file_spec = true; |
1432 | } | |
1433 | ||
c588d158 | 1434 | ptr = strpbrk_esc(arg, ";:+@%"); |
50656eec MH |
1435 | if (ptr) { |
1436 | nc = *ptr; | |
1437 | *ptr++ = '\0'; | |
1438 | } | |
1439 | ||
6c6e024f WN |
1440 | if (arg[0] == '\0') |
1441 | tmp = NULL; | |
1442 | else { | |
c588d158 | 1443 | tmp = strdup_esc(arg); |
6c6e024f WN |
1444 | if (tmp == NULL) |
1445 | return -ENOMEM; | |
1446 | } | |
02b95dad | 1447 | |
3099c026 | 1448 | if (file_spec) |
02b95dad | 1449 | pp->file = tmp; |
da15bd9d | 1450 | else { |
02b95dad | 1451 | pp->function = tmp; |
50656eec | 1452 | |
da15bd9d WN |
1453 | /* |
1454 | * Keep pp->function even if this is absolute address, | |
1455 | * so it can mark whether abs_address is valid. | |
1456 | * Which make 'perf probe lib.bin 0x0' possible. | |
1457 | * | |
1458 | * Note that checking length of tmp is not needed | |
1459 | * because when we access tmp[1] we know tmp[0] is '0', | |
1460 | * so tmp[1] should always valid (but could be '\0'). | |
1461 | */ | |
1462 | if (tmp && !strncmp(tmp, "0x", 2)) { | |
1463 | pp->abs_address = strtoul(pp->function, &tmp, 0); | |
1464 | if (*tmp != '\0') { | |
1465 | semantic_error("Invalid absolute address.\n"); | |
1466 | return -EINVAL; | |
1467 | } | |
1468 | } | |
1469 | } | |
1470 | ||
50656eec MH |
1471 | /* Parse other options */ |
1472 | while (ptr) { | |
1473 | arg = ptr; | |
1474 | c = nc; | |
2a9c8c36 | 1475 | if (c == ';') { /* Lazy pattern must be the last part */ |
c588d158 | 1476 | pp->lazy_line = strdup(arg); /* let leave escapes */ |
02b95dad MH |
1477 | if (pp->lazy_line == NULL) |
1478 | return -ENOMEM; | |
2a9c8c36 MH |
1479 | break; |
1480 | } | |
c588d158 | 1481 | ptr = strpbrk_esc(arg, ";:+@%"); |
50656eec MH |
1482 | if (ptr) { |
1483 | nc = *ptr; | |
1484 | *ptr++ = '\0'; | |
1485 | } | |
1486 | switch (c) { | |
1487 | case ':': /* Line number */ | |
1488 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 1489 | if (*tmp != '\0') { |
2a9c8c36 | 1490 | semantic_error("There is non-digit char" |
146a1439 MH |
1491 | " in line number.\n"); |
1492 | return -EINVAL; | |
1493 | } | |
50656eec MH |
1494 | break; |
1495 | case '+': /* Byte offset from a symbol */ | |
1496 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 1497 | if (*tmp != '\0') { |
2a9c8c36 | 1498 | semantic_error("There is non-digit character" |
146a1439 MH |
1499 | " in offset.\n"); |
1500 | return -EINVAL; | |
1501 | } | |
50656eec MH |
1502 | break; |
1503 | case '@': /* File name */ | |
146a1439 MH |
1504 | if (pp->file) { |
1505 | semantic_error("SRC@SRC is not allowed.\n"); | |
1506 | return -EINVAL; | |
1507 | } | |
c588d158 | 1508 | pp->file = strdup_esc(arg); |
02b95dad MH |
1509 | if (pp->file == NULL) |
1510 | return -ENOMEM; | |
50656eec MH |
1511 | break; |
1512 | case '%': /* Probe places */ | |
1513 | if (strcmp(arg, "return") == 0) { | |
1514 | pp->retprobe = 1; | |
146a1439 MH |
1515 | } else { /* Others not supported yet */ |
1516 | semantic_error("%%%s is not supported.\n", arg); | |
1517 | return -ENOTSUP; | |
1518 | } | |
50656eec | 1519 | break; |
146a1439 MH |
1520 | default: /* Buggy case */ |
1521 | pr_err("This program has a bug at %s:%d.\n", | |
1522 | __FILE__, __LINE__); | |
1523 | return -ENOTSUP; | |
50656eec MH |
1524 | break; |
1525 | } | |
1526 | } | |
1527 | ||
1528 | /* Exclusion check */ | |
146a1439 | 1529 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
1530 | semantic_error("Lazy pattern can't be used with" |
1531 | " line number.\n"); | |
146a1439 MH |
1532 | return -EINVAL; |
1533 | } | |
2a9c8c36 | 1534 | |
146a1439 | 1535 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 1536 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
1537 | return -EINVAL; |
1538 | } | |
2a9c8c36 | 1539 | |
146a1439 | 1540 | if (pp->line && pp->offset) { |
0e43e5d2 | 1541 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
1542 | return -EINVAL; |
1543 | } | |
50656eec | 1544 | |
146a1439 | 1545 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 1546 | semantic_error("File always requires line number or " |
0e43e5d2 | 1547 | "lazy pattern.\n"); |
146a1439 MH |
1548 | return -EINVAL; |
1549 | } | |
50656eec | 1550 | |
146a1439 | 1551 | if (pp->offset && !pp->function) { |
0e43e5d2 | 1552 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
1553 | return -EINVAL; |
1554 | } | |
50656eec | 1555 | |
146a1439 | 1556 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 1557 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 1558 | "return probe.\n"); |
146a1439 MH |
1559 | return -EINVAL; |
1560 | } | |
50656eec | 1561 | |
4235b045 | 1562 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
1563 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
1564 | pp->lazy_line); | |
146a1439 | 1565 | return 0; |
50656eec MH |
1566 | } |
1567 | ||
7df2f329 | 1568 | /* Parse perf-probe event argument */ |
146a1439 | 1569 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 1570 | { |
b2a3c12b | 1571 | char *tmp, *goodname; |
7df2f329 MH |
1572 | struct perf_probe_arg_field **fieldp; |
1573 | ||
1574 | pr_debug("parsing arg: %s into ", str); | |
1575 | ||
48481938 MH |
1576 | tmp = strchr(str, '='); |
1577 | if (tmp) { | |
02b95dad MH |
1578 | arg->name = strndup(str, tmp - str); |
1579 | if (arg->name == NULL) | |
1580 | return -ENOMEM; | |
11a1ca35 | 1581 | pr_debug("name:%s ", arg->name); |
48481938 MH |
1582 | str = tmp + 1; |
1583 | } | |
1584 | ||
11a1ca35 MH |
1585 | tmp = strchr(str, ':'); |
1586 | if (tmp) { /* Type setting */ | |
1587 | *tmp = '\0'; | |
02b95dad MH |
1588 | arg->type = strdup(tmp + 1); |
1589 | if (arg->type == NULL) | |
1590 | return -ENOMEM; | |
11a1ca35 MH |
1591 | pr_debug("type:%s ", arg->type); |
1592 | } | |
1593 | ||
b2a3c12b | 1594 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
1595 | if (!is_c_varname(str) || !tmp) { |
1596 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
1597 | arg->var = strdup(str); |
1598 | if (arg->var == NULL) | |
1599 | return -ENOMEM; | |
48481938 | 1600 | pr_debug("%s\n", arg->var); |
146a1439 | 1601 | return 0; |
7df2f329 MH |
1602 | } |
1603 | ||
b2a3c12b | 1604 | /* Structure fields or array element */ |
02b95dad MH |
1605 | arg->var = strndup(str, tmp - str); |
1606 | if (arg->var == NULL) | |
1607 | return -ENOMEM; | |
b2a3c12b | 1608 | goodname = arg->var; |
48481938 | 1609 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
1610 | fieldp = &arg->field; |
1611 | ||
1612 | do { | |
e334016f MH |
1613 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
1614 | if (*fieldp == NULL) | |
1615 | return -ENOMEM; | |
b2a3c12b MH |
1616 | if (*tmp == '[') { /* Array */ |
1617 | str = tmp; | |
1618 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 1619 | (*fieldp)->ref = true; |
b2a3c12b MH |
1620 | if (*tmp != ']' || tmp == str + 1) { |
1621 | semantic_error("Array index must be a" | |
1622 | " number.\n"); | |
1623 | return -EINVAL; | |
1624 | } | |
1625 | tmp++; | |
1626 | if (*tmp == '\0') | |
1627 | tmp = NULL; | |
1628 | } else { /* Structure */ | |
1629 | if (*tmp == '.') { | |
1630 | str = tmp + 1; | |
1631 | (*fieldp)->ref = false; | |
1632 | } else if (tmp[1] == '>') { | |
1633 | str = tmp + 2; | |
1634 | (*fieldp)->ref = true; | |
1635 | } else { | |
1636 | semantic_error("Argument parse error: %s\n", | |
1637 | str); | |
1638 | return -EINVAL; | |
1639 | } | |
1640 | tmp = strpbrk(str, "-.["); | |
146a1439 | 1641 | } |
7df2f329 | 1642 | if (tmp) { |
02b95dad MH |
1643 | (*fieldp)->name = strndup(str, tmp - str); |
1644 | if ((*fieldp)->name == NULL) | |
1645 | return -ENOMEM; | |
b2a3c12b MH |
1646 | if (*str != '[') |
1647 | goodname = (*fieldp)->name; | |
7df2f329 MH |
1648 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
1649 | fieldp = &(*fieldp)->next; | |
1650 | } | |
1651 | } while (tmp); | |
02b95dad MH |
1652 | (*fieldp)->name = strdup(str); |
1653 | if ((*fieldp)->name == NULL) | |
1654 | return -ENOMEM; | |
b2a3c12b MH |
1655 | if (*str != '[') |
1656 | goodname = (*fieldp)->name; | |
7df2f329 | 1657 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 1658 | |
b2a3c12b | 1659 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 1660 | if (!arg->name) { |
b2a3c12b | 1661 | arg->name = strdup(goodname); |
02b95dad MH |
1662 | if (arg->name == NULL) |
1663 | return -ENOMEM; | |
1664 | } | |
146a1439 | 1665 | return 0; |
7df2f329 MH |
1666 | } |
1667 | ||
4235b045 | 1668 | /* Parse perf-probe event command */ |
146a1439 | 1669 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 1670 | { |
e1c01d61 | 1671 | char **argv; |
146a1439 | 1672 | int argc, i, ret = 0; |
fac13fd5 | 1673 | |
4235b045 | 1674 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1675 | if (!argv) { |
1676 | pr_debug("Failed to split arguments.\n"); | |
1677 | return -ENOMEM; | |
1678 | } | |
1679 | if (argc - 1 > MAX_PROBE_ARGS) { | |
1680 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
1681 | ret = -ERANGE; | |
1682 | goto out; | |
1683 | } | |
50656eec | 1684 | /* Parse probe point */ |
146a1439 MH |
1685 | ret = parse_perf_probe_point(argv[0], pev); |
1686 | if (ret < 0) | |
1687 | goto out; | |
50656eec | 1688 | |
e1c01d61 | 1689 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 1690 | pev->nargs = argc - 1; |
e334016f MH |
1691 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1692 | if (pev->args == NULL) { | |
1693 | ret = -ENOMEM; | |
1694 | goto out; | |
1695 | } | |
146a1439 MH |
1696 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
1697 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
1698 | if (ret >= 0 && | |
1699 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 1700 | semantic_error("You can't specify local variable for" |
146a1439 MH |
1701 | " kretprobe.\n"); |
1702 | ret = -EINVAL; | |
1703 | } | |
e1c01d61 | 1704 | } |
146a1439 | 1705 | out: |
e1c01d61 | 1706 | argv_free(argv); |
146a1439 MH |
1707 | |
1708 | return ret; | |
50656eec MH |
1709 | } |
1710 | ||
b3f33f93 RB |
1711 | /* Returns true if *any* ARG is either C variable, $params or $vars. */ |
1712 | bool perf_probe_with_var(struct perf_probe_event *pev) | |
1713 | { | |
1714 | int i = 0; | |
1715 | ||
1716 | for (i = 0; i < pev->nargs; i++) | |
1717 | if (is_c_varname(pev->args[i].var) || | |
1718 | !strcmp(pev->args[i].var, PROBE_ARG_PARAMS) || | |
1719 | !strcmp(pev->args[i].var, PROBE_ARG_VARS)) | |
1720 | return true; | |
1721 | return false; | |
1722 | } | |
1723 | ||
4235b045 MH |
1724 | /* Return true if this perf_probe_event requires debuginfo */ |
1725 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
1726 | { | |
4235b045 MH |
1727 | if (pev->point.file || pev->point.line || pev->point.lazy_line) |
1728 | return true; | |
1729 | ||
b3f33f93 RB |
1730 | if (perf_probe_with_var(pev)) |
1731 | return true; | |
4235b045 MH |
1732 | |
1733 | return false; | |
1734 | } | |
1735 | ||
0e60836b | 1736 | /* Parse probe_events event into struct probe_point */ |
92f6c72e | 1737 | int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev) |
4de189fe | 1738 | { |
0e60836b | 1739 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
1740 | char pr; |
1741 | char *p; | |
bcbd0040 | 1742 | char *argv0_str = NULL, *fmt, *fmt1_str, *fmt2_str, *fmt3_str; |
4de189fe MH |
1743 | int ret, i, argc; |
1744 | char **argv; | |
1745 | ||
0e60836b | 1746 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1747 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1748 | if (!argv) { |
1749 | pr_debug("Failed to split arguments.\n"); | |
1750 | return -ENOMEM; | |
1751 | } | |
1752 | if (argc < 2) { | |
1753 | semantic_error("Too few probe arguments.\n"); | |
1754 | ret = -ERANGE; | |
1755 | goto out; | |
1756 | } | |
4de189fe MH |
1757 | |
1758 | /* Scan event and group name. */ | |
bcbd0040 IT |
1759 | argv0_str = strdup(argv[0]); |
1760 | if (argv0_str == NULL) { | |
1761 | ret = -ENOMEM; | |
1762 | goto out; | |
1763 | } | |
1764 | fmt1_str = strtok_r(argv0_str, ":", &fmt); | |
1765 | fmt2_str = strtok_r(NULL, "/", &fmt); | |
1766 | fmt3_str = strtok_r(NULL, " \t", &fmt); | |
1767 | if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL | |
1768 | || fmt3_str == NULL) { | |
146a1439 MH |
1769 | semantic_error("Failed to parse event name: %s\n", argv[0]); |
1770 | ret = -EINVAL; | |
1771 | goto out; | |
1772 | } | |
bcbd0040 IT |
1773 | pr = fmt1_str[0]; |
1774 | tev->group = strdup(fmt2_str); | |
1775 | tev->event = strdup(fmt3_str); | |
1776 | if (tev->group == NULL || tev->event == NULL) { | |
1777 | ret = -ENOMEM; | |
1778 | goto out; | |
1779 | } | |
4235b045 | 1780 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1781 | |
4235b045 | 1782 | tp->retprobe = (pr == 'r'); |
4de189fe | 1783 | |
190b57fc MH |
1784 | /* Scan module name(if there), function name and offset */ |
1785 | p = strchr(argv[1], ':'); | |
1786 | if (p) { | |
1787 | tp->module = strndup(argv[1], p - argv[1]); | |
844faa4b MH |
1788 | if (!tp->module) { |
1789 | ret = -ENOMEM; | |
1790 | goto out; | |
1791 | } | |
42bba263 | 1792 | tev->uprobes = (tp->module[0] == '/'); |
190b57fc MH |
1793 | p++; |
1794 | } else | |
1795 | p = argv[1]; | |
bcbd0040 | 1796 | fmt1_str = strtok_r(p, "+", &fmt); |
be07afe9 WN |
1797 | /* only the address started with 0x */ |
1798 | if (fmt1_str[0] == '0') { | |
1799 | /* | |
1800 | * Fix a special case: | |
1801 | * if address == 0, kernel reports something like: | |
1802 | * p:probe_libc/abs_0 /lib/libc-2.18.so:0x (null) arg1=%ax | |
1803 | * Newer kernel may fix that, but we want to | |
1804 | * support old kernel also. | |
1805 | */ | |
1806 | if (strcmp(fmt1_str, "0x") == 0) { | |
1807 | if (!argv[2] || strcmp(argv[2], "(null)")) { | |
1808 | ret = -EINVAL; | |
1809 | goto out; | |
1810 | } | |
1811 | tp->address = 0; | |
1812 | ||
1813 | free(argv[2]); | |
1814 | for (i = 2; argv[i + 1] != NULL; i++) | |
1815 | argv[i] = argv[i + 1]; | |
1816 | ||
1817 | argv[i] = NULL; | |
1818 | argc -= 1; | |
1819 | } else | |
1820 | tp->address = strtoul(fmt1_str, NULL, 0); | |
1821 | } else { | |
5a6f6314 MH |
1822 | /* Only the symbol-based probe has offset */ |
1823 | tp->symbol = strdup(fmt1_str); | |
1824 | if (tp->symbol == NULL) { | |
1825 | ret = -ENOMEM; | |
1826 | goto out; | |
1827 | } | |
1828 | fmt2_str = strtok_r(NULL, "", &fmt); | |
1829 | if (fmt2_str == NULL) | |
1830 | tp->offset = 0; | |
1831 | else | |
1832 | tp->offset = strtoul(fmt2_str, NULL, 10); | |
bcbd0040 | 1833 | } |
4de189fe | 1834 | |
4235b045 | 1835 | tev->nargs = argc - 2; |
0e60836b | 1836 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1837 | if (tev->args == NULL) { |
1838 | ret = -ENOMEM; | |
1839 | goto out; | |
1840 | } | |
4235b045 | 1841 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1842 | p = strchr(argv[i + 2], '='); |
1843 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1844 | *p++ = '\0'; |
1845 | else | |
1846 | p = argv[i + 2]; | |
02b95dad | 1847 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1848 | /* TODO: parse regs and offset */ |
02b95dad MH |
1849 | tev->args[i].value = strdup(p); |
1850 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1851 | ret = -ENOMEM; | |
1852 | goto out; | |
1853 | } | |
4de189fe | 1854 | } |
146a1439 MH |
1855 | ret = 0; |
1856 | out: | |
bcbd0040 | 1857 | free(argv0_str); |
4de189fe | 1858 | argv_free(argv); |
146a1439 | 1859 | return ret; |
4de189fe MH |
1860 | } |
1861 | ||
7df2f329 | 1862 | /* Compose only probe arg */ |
909b0360 | 1863 | char *synthesize_perf_probe_arg(struct perf_probe_arg *pa) |
7df2f329 MH |
1864 | { |
1865 | struct perf_probe_arg_field *field = pa->field; | |
909b0360 | 1866 | struct strbuf buf; |
bf4d5f25 MH |
1867 | char *ret = NULL; |
1868 | int err; | |
1869 | ||
1870 | if (strbuf_init(&buf, 64) < 0) | |
1871 | return NULL; | |
7df2f329 | 1872 | |
48481938 | 1873 | if (pa->name && pa->var) |
bf4d5f25 | 1874 | err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var); |
48481938 | 1875 | else |
bf4d5f25 MH |
1876 | err = strbuf_addstr(&buf, pa->name ?: pa->var); |
1877 | if (err) | |
1878 | goto out; | |
7df2f329 MH |
1879 | |
1880 | while (field) { | |
b2a3c12b | 1881 | if (field->name[0] == '[') |
bf4d5f25 | 1882 | err = strbuf_addstr(&buf, field->name); |
b2a3c12b | 1883 | else |
bf4d5f25 MH |
1884 | err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".", |
1885 | field->name); | |
7df2f329 | 1886 | field = field->next; |
bf4d5f25 MH |
1887 | if (err) |
1888 | goto out; | |
7df2f329 | 1889 | } |
11a1ca35 | 1890 | |
909b0360 | 1891 | if (pa->type) |
bf4d5f25 MH |
1892 | if (strbuf_addf(&buf, ":%s", pa->type) < 0) |
1893 | goto out; | |
909b0360 MH |
1894 | |
1895 | ret = strbuf_detach(&buf, NULL); | |
bf4d5f25 MH |
1896 | out: |
1897 | strbuf_release(&buf); | |
146a1439 | 1898 | return ret; |
7df2f329 MH |
1899 | } |
1900 | ||
4235b045 | 1901 | /* Compose only probe point (not argument) */ |
c4ff4920 | 1902 | char *synthesize_perf_probe_point(struct perf_probe_point *pp) |
4de189fe | 1903 | { |
909b0360 | 1904 | struct strbuf buf; |
bf4d5f25 MH |
1905 | char *tmp, *ret = NULL; |
1906 | int len, err = 0; | |
1907 | ||
1908 | if (strbuf_init(&buf, 64) < 0) | |
1909 | return NULL; | |
909b0360 | 1910 | |
909b0360 | 1911 | if (pp->function) { |
bf4d5f25 MH |
1912 | if (strbuf_addstr(&buf, pp->function) < 0) |
1913 | goto out; | |
909b0360 | 1914 | if (pp->offset) |
bf4d5f25 | 1915 | err = strbuf_addf(&buf, "+%lu", pp->offset); |
909b0360 | 1916 | else if (pp->line) |
bf4d5f25 | 1917 | err = strbuf_addf(&buf, ":%d", pp->line); |
909b0360 | 1918 | else if (pp->retprobe) |
bf4d5f25 MH |
1919 | err = strbuf_addstr(&buf, "%return"); |
1920 | if (err) | |
1921 | goto out; | |
fb1587d8 MH |
1922 | } |
1923 | if (pp->file) { | |
32ae2ade FBH |
1924 | tmp = pp->file; |
1925 | len = strlen(tmp); | |
1926 | if (len > 30) { | |
1927 | tmp = strchr(pp->file + len - 30, '/'); | |
1928 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1929 | } | |
bf4d5f25 MH |
1930 | err = strbuf_addf(&buf, "@%s", tmp); |
1931 | if (!err && !pp->function && pp->line) | |
1932 | err = strbuf_addf(&buf, ":%d", pp->line); | |
4de189fe | 1933 | } |
bf4d5f25 MH |
1934 | if (!err) |
1935 | ret = strbuf_detach(&buf, NULL); | |
1936 | out: | |
1937 | strbuf_release(&buf); | |
1938 | return ret; | |
7ef17aaf MH |
1939 | } |
1940 | ||
4235b045 | 1941 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) |
7ef17aaf | 1942 | { |
c4ff4920 MH |
1943 | struct strbuf buf; |
1944 | char *tmp, *ret = NULL; | |
1945 | int i; | |
7ef17aaf | 1946 | |
c4ff4920 | 1947 | if (strbuf_init(&buf, 64)) |
4235b045 | 1948 | return NULL; |
c4ff4920 MH |
1949 | if (pev->event) |
1950 | if (strbuf_addf(&buf, "%s:%s=", pev->group ?: PERFPROBE_GROUP, | |
1951 | pev->event) < 0) | |
1952 | goto out; | |
1953 | ||
1954 | tmp = synthesize_perf_probe_point(&pev->point); | |
1955 | if (!tmp || strbuf_addstr(&buf, tmp) < 0) | |
1956 | goto out; | |
1957 | free(tmp); | |
4de189fe | 1958 | |
4235b045 | 1959 | for (i = 0; i < pev->nargs; i++) { |
c4ff4920 MH |
1960 | tmp = synthesize_perf_probe_arg(pev->args + i); |
1961 | if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) | |
1962 | goto out; | |
1963 | free(tmp); | |
4de189fe | 1964 | } |
4de189fe | 1965 | |
c4ff4920 MH |
1966 | ret = strbuf_detach(&buf, NULL); |
1967 | out: | |
1968 | strbuf_release(&buf); | |
1969 | return ret; | |
4235b045 | 1970 | } |
4235b045 | 1971 | |
0e60836b | 1972 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
909b0360 | 1973 | struct strbuf *buf, int depth) |
4235b045 | 1974 | { |
bf4d5f25 | 1975 | int err; |
4235b045 | 1976 | if (ref->next) { |
0e60836b | 1977 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
909b0360 | 1978 | depth + 1); |
4235b045 | 1979 | if (depth < 0) |
bf4d5f25 | 1980 | return depth; |
4235b045 | 1981 | } |
bf4d5f25 MH |
1982 | err = strbuf_addf(buf, "%+ld(", ref->offset); |
1983 | return (err < 0) ? err : depth; | |
4de189fe MH |
1984 | } |
1985 | ||
0e60836b | 1986 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
909b0360 | 1987 | struct strbuf *buf) |
50656eec | 1988 | { |
0e60836b | 1989 | struct probe_trace_arg_ref *ref = arg->ref; |
bf4d5f25 | 1990 | int depth = 0, err; |
4235b045 MH |
1991 | |
1992 | /* Argument name or separator */ | |
1993 | if (arg->name) | |
bf4d5f25 | 1994 | err = strbuf_addf(buf, " %s=", arg->name); |
4235b045 | 1995 | else |
bf4d5f25 MH |
1996 | err = strbuf_addch(buf, ' '); |
1997 | if (err) | |
1998 | return err; | |
4235b045 | 1999 | |
b7dcb857 MH |
2000 | /* Special case: @XXX */ |
2001 | if (arg->value[0] == '@' && arg->ref) | |
2002 | ref = ref->next; | |
2003 | ||
4235b045 | 2004 | /* Dereferencing arguments */ |
b7dcb857 | 2005 | if (ref) { |
909b0360 | 2006 | depth = __synthesize_probe_trace_arg_ref(ref, buf, 1); |
4235b045 MH |
2007 | if (depth < 0) |
2008 | return depth; | |
2009 | } | |
2010 | ||
2011 | /* Print argument value */ | |
b7dcb857 | 2012 | if (arg->value[0] == '@' && arg->ref) |
bf4d5f25 | 2013 | err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset); |
b7dcb857 | 2014 | else |
bf4d5f25 | 2015 | err = strbuf_addstr(buf, arg->value); |
4235b045 MH |
2016 | |
2017 | /* Closing */ | |
bf4d5f25 MH |
2018 | while (!err && depth--) |
2019 | err = strbuf_addch(buf, ')'); | |
2020 | ||
4984912e | 2021 | /* Print argument type */ |
bf4d5f25 MH |
2022 | if (!err && arg->type) |
2023 | err = strbuf_addf(buf, ":%s", arg->type); | |
4235b045 | 2024 | |
bf4d5f25 | 2025 | return err; |
4235b045 MH |
2026 | } |
2027 | ||
0e60836b | 2028 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 2029 | { |
0e60836b | 2030 | struct probe_trace_point *tp = &tev->point; |
909b0360 MH |
2031 | struct strbuf buf; |
2032 | char *ret = NULL; | |
bf4d5f25 | 2033 | int i, err; |
eb948e50 | 2034 | |
da15bd9d WN |
2035 | /* Uprobes must have tp->module */ |
2036 | if (tev->uprobes && !tp->module) | |
909b0360 MH |
2037 | return NULL; |
2038 | ||
bf4d5f25 MH |
2039 | if (strbuf_init(&buf, 32) < 0) |
2040 | return NULL; | |
2041 | ||
2042 | if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p', | |
2043 | tev->group, tev->event) < 0) | |
2044 | goto error; | |
da15bd9d WN |
2045 | /* |
2046 | * If tp->address == 0, then this point must be a | |
2047 | * absolute address uprobe. | |
2048 | * try_to_find_absolute_address() should have made | |
2049 | * tp->symbol to "0x0". | |
2050 | */ | |
2051 | if (tev->uprobes && !tp->address) { | |
2052 | if (!tp->symbol || strcmp(tp->symbol, "0x0")) | |
2053 | goto error; | |
2054 | } | |
eb948e50 MH |
2055 | |
2056 | /* Use the tp->address for uprobes */ | |
225466f1 | 2057 | if (tev->uprobes) |
bf4d5f25 | 2058 | err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address); |
da15bd9d WN |
2059 | else if (!strncmp(tp->symbol, "0x", 2)) |
2060 | /* Absolute address. See try_to_find_absolute_address() */ | |
bf4d5f25 MH |
2061 | err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "", |
2062 | tp->module ? ":" : "", tp->address); | |
225466f1 | 2063 | else |
bf4d5f25 MH |
2064 | err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "", |
2065 | tp->module ? ":" : "", tp->symbol, tp->offset); | |
2066 | if (err) | |
2067 | goto error; | |
50656eec | 2068 | |
909b0360 MH |
2069 | for (i = 0; i < tev->nargs; i++) |
2070 | if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0) | |
50656eec | 2071 | goto error; |
50656eec | 2072 | |
909b0360 | 2073 | ret = strbuf_detach(&buf, NULL); |
50656eec | 2074 | error: |
909b0360 MH |
2075 | strbuf_release(&buf); |
2076 | return ret; | |
4235b045 | 2077 | } |
50656eec | 2078 | |
5a6f6314 MH |
2079 | static int find_perf_probe_point_from_map(struct probe_trace_point *tp, |
2080 | struct perf_probe_point *pp, | |
2081 | bool is_kprobe) | |
2082 | { | |
2083 | struct symbol *sym = NULL; | |
8a2efd6d | 2084 | struct map *map = NULL; |
e486367f | 2085 | u64 addr = tp->address; |
5a6f6314 MH |
2086 | int ret = -ENOENT; |
2087 | ||
2088 | if (!is_kprobe) { | |
2089 | map = dso__new_map(tp->module); | |
2090 | if (!map) | |
2091 | goto out; | |
be39db9f | 2092 | sym = map__find_symbol(map, addr); |
5a6f6314 | 2093 | } else { |
9b239a12 | 2094 | if (tp->symbol && !addr) { |
0a62f686 MH |
2095 | if (kernel_get_symbol_address_by_name(tp->symbol, |
2096 | &addr, true, false) < 0) | |
9b239a12 MH |
2097 | goto out; |
2098 | } | |
5a6f6314 MH |
2099 | if (addr) { |
2100 | addr += tp->offset; | |
2101 | sym = __find_kernel_function(addr, &map); | |
2102 | } | |
2103 | } | |
98d3b258 | 2104 | |
5a6f6314 MH |
2105 | if (!sym) |
2106 | goto out; | |
2107 | ||
2108 | pp->retprobe = tp->retprobe; | |
2109 | pp->offset = addr - map->unmap_ip(map, sym->start); | |
2110 | pp->function = strdup(sym->name); | |
2111 | ret = pp->function ? 0 : -ENOMEM; | |
2112 | ||
2113 | out: | |
2114 | if (map && !is_kprobe) { | |
84c2cafa | 2115 | map__put(map); |
5a6f6314 MH |
2116 | } |
2117 | ||
2118 | return ret; | |
2119 | } | |
2120 | ||
2121 | static int convert_to_perf_probe_point(struct probe_trace_point *tp, | |
da15bd9d WN |
2122 | struct perf_probe_point *pp, |
2123 | bool is_kprobe) | |
5a6f6314 MH |
2124 | { |
2125 | char buf[128]; | |
2126 | int ret; | |
2127 | ||
2128 | ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe); | |
2129 | if (!ret) | |
2130 | return 0; | |
2131 | ret = find_perf_probe_point_from_map(tp, pp, is_kprobe); | |
2132 | if (!ret) | |
2133 | return 0; | |
2134 | ||
2135 | pr_debug("Failed to find probe point from both of dwarf and map.\n"); | |
2136 | ||
2137 | if (tp->symbol) { | |
2138 | pp->function = strdup(tp->symbol); | |
2139 | pp->offset = tp->offset; | |
614e2fdb | 2140 | } else { |
5a6f6314 MH |
2141 | ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address); |
2142 | if (ret < 0) | |
2143 | return ret; | |
2144 | pp->function = strdup(buf); | |
2145 | pp->offset = 0; | |
2146 | } | |
2147 | if (pp->function == NULL) | |
2148 | return -ENOMEM; | |
2149 | ||
2150 | pp->retprobe = tp->retprobe; | |
2151 | ||
2152 | return 0; | |
2153 | } | |
2154 | ||
0e60836b | 2155 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
225466f1 | 2156 | struct perf_probe_event *pev, bool is_kprobe) |
4235b045 | 2157 | { |
909b0360 | 2158 | struct strbuf buf = STRBUF_INIT; |
146a1439 | 2159 | int i, ret; |
4235b045 | 2160 | |
4b4da7f7 | 2161 | /* Convert event/group name */ |
02b95dad MH |
2162 | pev->event = strdup(tev->event); |
2163 | pev->group = strdup(tev->group); | |
2164 | if (pev->event == NULL || pev->group == NULL) | |
2165 | return -ENOMEM; | |
fb1587d8 | 2166 | |
4b4da7f7 | 2167 | /* Convert trace_point to probe_point */ |
5a6f6314 | 2168 | ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe); |
146a1439 MH |
2169 | if (ret < 0) |
2170 | return ret; | |
4b4da7f7 | 2171 | |
4235b045 MH |
2172 | /* Convert trace_arg to probe_arg */ |
2173 | pev->nargs = tev->nargs; | |
e334016f MH |
2174 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
2175 | if (pev->args == NULL) | |
2176 | return -ENOMEM; | |
02b95dad | 2177 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 2178 | if (tev->args[i].name) |
02b95dad | 2179 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 2180 | else { |
bf4d5f25 MH |
2181 | if ((ret = strbuf_init(&buf, 32)) < 0) |
2182 | goto error; | |
909b0360 MH |
2183 | ret = synthesize_probe_trace_arg(&tev->args[i], &buf); |
2184 | pev->args[i].name = strbuf_detach(&buf, NULL); | |
4235b045 | 2185 | } |
02b95dad MH |
2186 | if (pev->args[i].name == NULL && ret >= 0) |
2187 | ret = -ENOMEM; | |
2188 | } | |
bf4d5f25 | 2189 | error: |
146a1439 MH |
2190 | if (ret < 0) |
2191 | clear_perf_probe_event(pev); | |
2192 | ||
2193 | return ret; | |
4235b045 MH |
2194 | } |
2195 | ||
2196 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
2197 | { | |
7df2f329 | 2198 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
2199 | int i; |
2200 | ||
f5385650 ACM |
2201 | free(pev->event); |
2202 | free(pev->group); | |
7afb3fab | 2203 | free(pev->target); |
9b118aca | 2204 | clear_perf_probe_point(&pev->point); |
f5385650 | 2205 | |
7df2f329 | 2206 | for (i = 0; i < pev->nargs; i++) { |
f5385650 ACM |
2207 | free(pev->args[i].name); |
2208 | free(pev->args[i].var); | |
2209 | free(pev->args[i].type); | |
7df2f329 MH |
2210 | field = pev->args[i].field; |
2211 | while (field) { | |
2212 | next = field->next; | |
74cf249d | 2213 | zfree(&field->name); |
7df2f329 MH |
2214 | free(field); |
2215 | field = next; | |
2216 | } | |
2217 | } | |
f5385650 | 2218 | free(pev->args); |
4235b045 MH |
2219 | memset(pev, 0, sizeof(*pev)); |
2220 | } | |
2221 | ||
0542bb9c MH |
2222 | #define strdup_or_goto(str, label) \ |
2223 | ({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; }) | |
2224 | ||
2225 | static int perf_probe_point__copy(struct perf_probe_point *dst, | |
2226 | struct perf_probe_point *src) | |
2227 | { | |
2228 | dst->file = strdup_or_goto(src->file, out_err); | |
2229 | dst->function = strdup_or_goto(src->function, out_err); | |
2230 | dst->lazy_line = strdup_or_goto(src->lazy_line, out_err); | |
2231 | dst->line = src->line; | |
2232 | dst->retprobe = src->retprobe; | |
2233 | dst->offset = src->offset; | |
2234 | return 0; | |
2235 | ||
2236 | out_err: | |
2237 | clear_perf_probe_point(dst); | |
2238 | return -ENOMEM; | |
2239 | } | |
2240 | ||
2241 | static int perf_probe_arg__copy(struct perf_probe_arg *dst, | |
2242 | struct perf_probe_arg *src) | |
2243 | { | |
2244 | struct perf_probe_arg_field *field, **ppfield; | |
2245 | ||
2246 | dst->name = strdup_or_goto(src->name, out_err); | |
2247 | dst->var = strdup_or_goto(src->var, out_err); | |
2248 | dst->type = strdup_or_goto(src->type, out_err); | |
2249 | ||
2250 | field = src->field; | |
2251 | ppfield = &(dst->field); | |
2252 | while (field) { | |
2253 | *ppfield = zalloc(sizeof(*field)); | |
2254 | if (!*ppfield) | |
2255 | goto out_err; | |
2256 | (*ppfield)->name = strdup_or_goto(field->name, out_err); | |
2257 | (*ppfield)->index = field->index; | |
2258 | (*ppfield)->ref = field->ref; | |
2259 | field = field->next; | |
2260 | ppfield = &((*ppfield)->next); | |
2261 | } | |
2262 | return 0; | |
2263 | out_err: | |
2264 | return -ENOMEM; | |
2265 | } | |
2266 | ||
2267 | int perf_probe_event__copy(struct perf_probe_event *dst, | |
2268 | struct perf_probe_event *src) | |
2269 | { | |
2270 | int i; | |
2271 | ||
2272 | dst->event = strdup_or_goto(src->event, out_err); | |
2273 | dst->group = strdup_or_goto(src->group, out_err); | |
2274 | dst->target = strdup_or_goto(src->target, out_err); | |
2275 | dst->uprobes = src->uprobes; | |
2276 | ||
2277 | if (perf_probe_point__copy(&dst->point, &src->point) < 0) | |
2278 | goto out_err; | |
2279 | ||
2280 | dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs); | |
2281 | if (!dst->args) | |
2282 | goto out_err; | |
2283 | dst->nargs = src->nargs; | |
2284 | ||
2285 | for (i = 0; i < src->nargs; i++) | |
2286 | if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0) | |
2287 | goto out_err; | |
2288 | return 0; | |
2289 | ||
2290 | out_err: | |
2291 | clear_perf_probe_event(dst); | |
2292 | return -ENOMEM; | |
2293 | } | |
2294 | ||
92f6c72e | 2295 | void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 2296 | { |
0e60836b | 2297 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
2298 | int i; |
2299 | ||
f5385650 ACM |
2300 | free(tev->event); |
2301 | free(tev->group); | |
2302 | free(tev->point.symbol); | |
4c859351 | 2303 | free(tev->point.realname); |
f5385650 | 2304 | free(tev->point.module); |
4235b045 | 2305 | for (i = 0; i < tev->nargs; i++) { |
f5385650 ACM |
2306 | free(tev->args[i].name); |
2307 | free(tev->args[i].value); | |
2308 | free(tev->args[i].type); | |
4235b045 MH |
2309 | ref = tev->args[i].ref; |
2310 | while (ref) { | |
2311 | next = ref->next; | |
2312 | free(ref); | |
2313 | ref = next; | |
2314 | } | |
2315 | } | |
f5385650 | 2316 | free(tev->args); |
4235b045 | 2317 | memset(tev, 0, sizeof(*tev)); |
50656eec MH |
2318 | } |
2319 | ||
9aaf5a5f MH |
2320 | struct kprobe_blacklist_node { |
2321 | struct list_head list; | |
2322 | unsigned long start; | |
2323 | unsigned long end; | |
2324 | char *symbol; | |
2325 | }; | |
2326 | ||
2327 | static void kprobe_blacklist__delete(struct list_head *blacklist) | |
2328 | { | |
2329 | struct kprobe_blacklist_node *node; | |
2330 | ||
2331 | while (!list_empty(blacklist)) { | |
2332 | node = list_first_entry(blacklist, | |
2333 | struct kprobe_blacklist_node, list); | |
2334 | list_del(&node->list); | |
2335 | free(node->symbol); | |
2336 | free(node); | |
2337 | } | |
2338 | } | |
2339 | ||
2340 | static int kprobe_blacklist__load(struct list_head *blacklist) | |
2341 | { | |
2342 | struct kprobe_blacklist_node *node; | |
4605eab3 | 2343 | const char *__debugfs = debugfs__mountpoint(); |
9aaf5a5f MH |
2344 | char buf[PATH_MAX], *p; |
2345 | FILE *fp; | |
2346 | int ret; | |
2347 | ||
2348 | if (__debugfs == NULL) | |
2349 | return -ENOTSUP; | |
2350 | ||
2351 | ret = e_snprintf(buf, PATH_MAX, "%s/kprobes/blacklist", __debugfs); | |
2352 | if (ret < 0) | |
2353 | return ret; | |
2354 | ||
2355 | fp = fopen(buf, "r"); | |
2356 | if (!fp) | |
2357 | return -errno; | |
2358 | ||
2359 | ret = 0; | |
2360 | while (fgets(buf, PATH_MAX, fp)) { | |
2361 | node = zalloc(sizeof(*node)); | |
2362 | if (!node) { | |
2363 | ret = -ENOMEM; | |
2364 | break; | |
2365 | } | |
2366 | INIT_LIST_HEAD(&node->list); | |
2367 | list_add_tail(&node->list, blacklist); | |
2368 | if (sscanf(buf, "0x%lx-0x%lx", &node->start, &node->end) != 2) { | |
2369 | ret = -EINVAL; | |
2370 | break; | |
2371 | } | |
2372 | p = strchr(buf, '\t'); | |
2373 | if (p) { | |
2374 | p++; | |
2375 | if (p[strlen(p) - 1] == '\n') | |
2376 | p[strlen(p) - 1] = '\0'; | |
2377 | } else | |
2378 | p = (char *)"unknown"; | |
2379 | node->symbol = strdup(p); | |
2380 | if (!node->symbol) { | |
2381 | ret = -ENOMEM; | |
2382 | break; | |
2383 | } | |
2384 | pr_debug2("Blacklist: 0x%lx-0x%lx, %s\n", | |
2385 | node->start, node->end, node->symbol); | |
2386 | ret++; | |
2387 | } | |
2388 | if (ret < 0) | |
2389 | kprobe_blacklist__delete(blacklist); | |
2390 | fclose(fp); | |
2391 | ||
2392 | return ret; | |
2393 | } | |
2394 | ||
2395 | static struct kprobe_blacklist_node * | |
2396 | kprobe_blacklist__find_by_address(struct list_head *blacklist, | |
2397 | unsigned long address) | |
2398 | { | |
2399 | struct kprobe_blacklist_node *node; | |
2400 | ||
2401 | list_for_each_entry(node, blacklist, list) { | |
2c29461e | 2402 | if (node->start <= address && address < node->end) |
9aaf5a5f MH |
2403 | return node; |
2404 | } | |
2405 | ||
2406 | return NULL; | |
2407 | } | |
2408 | ||
b031220d MH |
2409 | static LIST_HEAD(kprobe_blacklist); |
2410 | ||
2411 | static void kprobe_blacklist__init(void) | |
2412 | { | |
2413 | if (!list_empty(&kprobe_blacklist)) | |
2414 | return; | |
2415 | ||
2416 | if (kprobe_blacklist__load(&kprobe_blacklist) < 0) | |
2417 | pr_debug("No kprobe blacklist support, ignored\n"); | |
2418 | } | |
2419 | ||
2420 | static void kprobe_blacklist__release(void) | |
2421 | { | |
2422 | kprobe_blacklist__delete(&kprobe_blacklist); | |
2423 | } | |
2424 | ||
2425 | static bool kprobe_blacklist__listed(unsigned long address) | |
2426 | { | |
2427 | return !!kprobe_blacklist__find_by_address(&kprobe_blacklist, address); | |
2428 | } | |
2429 | ||
d350bd57 MH |
2430 | static int perf_probe_event__sprintf(const char *group, const char *event, |
2431 | struct perf_probe_event *pev, | |
ba7ecb02 MH |
2432 | const char *module, |
2433 | struct strbuf *result) | |
278498d4 | 2434 | { |
bf4d5f25 | 2435 | int i, ret; |
909b0360 | 2436 | char *buf; |
278498d4 | 2437 | |
909b0360 MH |
2438 | if (asprintf(&buf, "%s:%s", group, event) < 0) |
2439 | return -errno; | |
bf4d5f25 | 2440 | ret = strbuf_addf(result, " %-20s (on ", buf); |
909b0360 | 2441 | free(buf); |
bf4d5f25 MH |
2442 | if (ret) |
2443 | return ret; | |
4235b045 | 2444 | |
909b0360 MH |
2445 | /* Synthesize only event probe point */ |
2446 | buf = synthesize_perf_probe_point(&pev->point); | |
2447 | if (!buf) | |
2448 | return -ENOMEM; | |
bf4d5f25 | 2449 | ret = strbuf_addstr(result, buf); |
909b0360 | 2450 | free(buf); |
146a1439 | 2451 | |
bf4d5f25 MH |
2452 | if (!ret && module) |
2453 | ret = strbuf_addf(result, " in %s", module); | |
278498d4 | 2454 | |
bf4d5f25 MH |
2455 | if (!ret && pev->nargs > 0) { |
2456 | ret = strbuf_add(result, " with", 5); | |
2457 | for (i = 0; !ret && i < pev->nargs; i++) { | |
909b0360 MH |
2458 | buf = synthesize_perf_probe_arg(&pev->args[i]); |
2459 | if (!buf) | |
2460 | return -ENOMEM; | |
bf4d5f25 | 2461 | ret = strbuf_addf(result, " %s", buf); |
909b0360 | 2462 | free(buf); |
7df2f329 | 2463 | } |
278498d4 | 2464 | } |
bf4d5f25 MH |
2465 | if (!ret) |
2466 | ret = strbuf_addch(result, ')'); | |
909b0360 | 2467 | |
bf4d5f25 | 2468 | return ret; |
278498d4 MH |
2469 | } |
2470 | ||
ba7ecb02 | 2471 | /* Show an event */ |
b02137cc NK |
2472 | int show_perf_probe_event(const char *group, const char *event, |
2473 | struct perf_probe_event *pev, | |
2474 | const char *module, bool use_stdout) | |
ba7ecb02 MH |
2475 | { |
2476 | struct strbuf buf = STRBUF_INIT; | |
2477 | int ret; | |
2478 | ||
d350bd57 | 2479 | ret = perf_probe_event__sprintf(group, event, pev, module, &buf); |
ba7ecb02 MH |
2480 | if (ret >= 0) { |
2481 | if (use_stdout) | |
2482 | printf("%s\n", buf.buf); | |
2483 | else | |
2484 | pr_info("%s\n", buf.buf); | |
2485 | } | |
2486 | strbuf_release(&buf); | |
2487 | ||
2488 | return ret; | |
2489 | } | |
2490 | ||
b6a89643 MH |
2491 | static bool filter_probe_trace_event(struct probe_trace_event *tev, |
2492 | struct strfilter *filter) | |
2493 | { | |
2494 | char tmp[128]; | |
2495 | ||
2496 | /* At first, check the event name itself */ | |
2497 | if (strfilter__compare(filter, tev->event)) | |
2498 | return true; | |
2499 | ||
2500 | /* Next, check the combination of name and group */ | |
2501 | if (e_snprintf(tmp, 128, "%s:%s", tev->group, tev->event) < 0) | |
2502 | return false; | |
2503 | return strfilter__compare(filter, tmp); | |
2504 | } | |
2505 | ||
2506 | static int __show_perf_probe_events(int fd, bool is_kprobe, | |
2507 | struct strfilter *filter) | |
4de189fe | 2508 | { |
225466f1 | 2509 | int ret = 0; |
0e60836b | 2510 | struct probe_trace_event tev; |
4235b045 | 2511 | struct perf_probe_event pev; |
4de189fe MH |
2512 | struct strlist *rawlist; |
2513 | struct str_node *ent; | |
2514 | ||
4235b045 MH |
2515 | memset(&tev, 0, sizeof(tev)); |
2516 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 2517 | |
92f6c72e | 2518 | rawlist = probe_file__get_rawlist(fd); |
146a1439 | 2519 | if (!rawlist) |
6eb08660 | 2520 | return -ENOMEM; |
4de189fe | 2521 | |
602a1f4d | 2522 | strlist__for_each_entry(ent, rawlist) { |
0e60836b | 2523 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 | 2524 | if (ret >= 0) { |
b6a89643 MH |
2525 | if (!filter_probe_trace_event(&tev, filter)) |
2526 | goto next; | |
225466f1 SD |
2527 | ret = convert_to_perf_probe_event(&tev, &pev, |
2528 | is_kprobe); | |
ba7ecb02 MH |
2529 | if (ret < 0) |
2530 | goto next; | |
d350bd57 MH |
2531 | ret = show_perf_probe_event(pev.group, pev.event, |
2532 | &pev, tev.point.module, | |
ba7ecb02 | 2533 | true); |
146a1439 | 2534 | } |
b6a89643 | 2535 | next: |
4235b045 | 2536 | clear_perf_probe_event(&pev); |
0e60836b | 2537 | clear_probe_trace_event(&tev); |
146a1439 MH |
2538 | if (ret < 0) |
2539 | break; | |
4de189fe | 2540 | } |
4de189fe | 2541 | strlist__delete(rawlist); |
7737af01 MH |
2542 | /* Cleanup cached debuginfo if needed */ |
2543 | debuginfo_cache__exit(); | |
146a1439 MH |
2544 | |
2545 | return ret; | |
4de189fe MH |
2546 | } |
2547 | ||
225466f1 | 2548 | /* List up current perf-probe events */ |
b6a89643 | 2549 | int show_perf_probe_events(struct strfilter *filter) |
225466f1 | 2550 | { |
5e45187c | 2551 | int kp_fd, up_fd, ret; |
225466f1 SD |
2552 | |
2553 | setup_pager(); | |
225466f1 | 2554 | |
1f3736c9 MH |
2555 | if (probe_conf.cache) |
2556 | return probe_cache__show_all_caches(filter); | |
2557 | ||
9bae1e8c | 2558 | ret = init_probe_symbol_maps(false); |
225466f1 SD |
2559 | if (ret < 0) |
2560 | return ret; | |
2561 | ||
92f6c72e MH |
2562 | ret = probe_file__open_both(&kp_fd, &up_fd, 0); |
2563 | if (ret < 0) | |
2564 | return ret; | |
225466f1 | 2565 | |
92f6c72e MH |
2566 | if (kp_fd >= 0) |
2567 | ret = __show_perf_probe_events(kp_fd, true, filter); | |
2568 | if (up_fd >= 0 && ret >= 0) | |
b6a89643 | 2569 | ret = __show_perf_probe_events(up_fd, false, filter); |
92f6c72e MH |
2570 | if (kp_fd > 0) |
2571 | close(kp_fd); | |
2572 | if (up_fd > 0) | |
5e45187c | 2573 | close(up_fd); |
9bae1e8c | 2574 | exit_probe_symbol_maps(); |
225466f1 | 2575 | |
146a1439 | 2576 | return ret; |
50656eec MH |
2577 | } |
2578 | ||
146a1439 | 2579 | static int get_new_event_name(char *buf, size_t len, const char *base, |
e63c625a MH |
2580 | struct strlist *namelist, bool ret_event, |
2581 | bool allow_suffix) | |
b498ce1f MH |
2582 | { |
2583 | int i, ret; | |
663b1151 | 2584 | char *p, *nbase; |
17f88fcd | 2585 | |
3099c026 NR |
2586 | if (*base == '.') |
2587 | base++; | |
663b1151 MH |
2588 | nbase = strdup(base); |
2589 | if (!nbase) | |
2590 | return -ENOMEM; | |
2591 | ||
a3110cd9 MH |
2592 | /* Cut off the dot suffixes (e.g. .const, .isra) and version suffixes */ |
2593 | p = strpbrk(nbase, ".@"); | |
663b1151 MH |
2594 | if (p && p != nbase) |
2595 | *p = '\0'; | |
3099c026 | 2596 | |
663b1151 | 2597 | /* Try no suffix number */ |
e63c625a | 2598 | ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : ""); |
146a1439 | 2599 | if (ret < 0) { |
5f03cba4 | 2600 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2601 | goto out; |
146a1439 | 2602 | } |
17f88fcd | 2603 | if (!strlist__has_entry(namelist, buf)) |
663b1151 | 2604 | goto out; |
17f88fcd | 2605 | |
d761b08b | 2606 | if (!allow_suffix) { |
03e01f56 WN |
2607 | pr_warning("Error: event \"%s\" already exists.\n" |
2608 | " Hint: Remove existing event by 'perf probe -d'\n" | |
2609 | " or force duplicates by 'perf probe -f'\n" | |
2610 | " or set 'force=yes' in BPF source.\n", | |
2611 | buf); | |
663b1151 MH |
2612 | ret = -EEXIST; |
2613 | goto out; | |
d761b08b MH |
2614 | } |
2615 | ||
17f88fcd MH |
2616 | /* Try to add suffix */ |
2617 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
663b1151 | 2618 | ret = e_snprintf(buf, len, "%s_%d", nbase, i); |
146a1439 | 2619 | if (ret < 0) { |
5f03cba4 | 2620 | pr_debug("snprintf() failed: %d\n", ret); |
663b1151 | 2621 | goto out; |
146a1439 | 2622 | } |
b498ce1f MH |
2623 | if (!strlist__has_entry(namelist, buf)) |
2624 | break; | |
2625 | } | |
146a1439 MH |
2626 | if (i == MAX_EVENT_INDEX) { |
2627 | pr_warning("Too many events are on the same function.\n"); | |
2628 | ret = -ERANGE; | |
2629 | } | |
2630 | ||
663b1151 MH |
2631 | out: |
2632 | free(nbase); | |
9f5c6d87 MH |
2633 | |
2634 | /* Final validation */ | |
2635 | if (ret >= 0 && !is_c_func_name(buf)) { | |
2636 | pr_warning("Internal error: \"%s\" is an invalid event name.\n", | |
2637 | buf); | |
2638 | ret = -EINVAL; | |
2639 | } | |
2640 | ||
146a1439 | 2641 | return ret; |
b498ce1f MH |
2642 | } |
2643 | ||
79702f61 MH |
2644 | /* Warn if the current kernel's uprobe implementation is old */ |
2645 | static void warn_uprobe_event_compat(struct probe_trace_event *tev) | |
2646 | { | |
2647 | int i; | |
2648 | char *buf = synthesize_probe_trace_command(tev); | |
2649 | ||
2650 | /* Old uprobe event doesn't support memory dereference */ | |
2651 | if (!tev->uprobes || tev->nargs == 0 || !buf) | |
2652 | goto out; | |
2653 | ||
2654 | for (i = 0; i < tev->nargs; i++) | |
2655 | if (strglobmatch(tev->args[i].value, "[$@+-]*")) { | |
2656 | pr_warning("Please upgrade your kernel to at least " | |
2657 | "3.14 to have access to feature %s\n", | |
2658 | tev->args[i].value); | |
2659 | break; | |
2660 | } | |
2661 | out: | |
2662 | free(buf); | |
2663 | } | |
2664 | ||
a3c9de62 MH |
2665 | /* Set new name from original perf_probe_event and namelist */ |
2666 | static int probe_trace_event__set_name(struct probe_trace_event *tev, | |
2667 | struct perf_probe_event *pev, | |
2668 | struct strlist *namelist, | |
2669 | bool allow_suffix) | |
2670 | { | |
2671 | const char *event, *group; | |
2672 | char buf[64]; | |
2673 | int ret; | |
2674 | ||
bc062230 | 2675 | /* If probe_event or trace_event already have the name, reuse it */ |
42bba263 | 2676 | if (pev->event && !pev->sdt) |
a3c9de62 | 2677 | event = pev->event; |
bc062230 MH |
2678 | else if (tev->event) |
2679 | event = tev->event; | |
2680 | else { | |
2681 | /* Or generate new one from probe point */ | |
da15bd9d WN |
2682 | if (pev->point.function && |
2683 | (strncmp(pev->point.function, "0x", 2) != 0) && | |
2684 | !strisglob(pev->point.function)) | |
a3c9de62 MH |
2685 | event = pev->point.function; |
2686 | else | |
2687 | event = tev->point.realname; | |
bc062230 | 2688 | } |
42bba263 | 2689 | if (pev->group && !pev->sdt) |
a3c9de62 | 2690 | group = pev->group; |
bc062230 MH |
2691 | else if (tev->group) |
2692 | group = tev->group; | |
a3c9de62 MH |
2693 | else |
2694 | group = PERFPROBE_GROUP; | |
2695 | ||
2696 | /* Get an unused new event name */ | |
e63c625a MH |
2697 | ret = get_new_event_name(buf, 64, event, namelist, |
2698 | tev->point.retprobe, allow_suffix); | |
a3c9de62 MH |
2699 | if (ret < 0) |
2700 | return ret; | |
2701 | ||
2702 | event = buf; | |
2703 | ||
2704 | tev->event = strdup(event); | |
2705 | tev->group = strdup(group); | |
2706 | if (tev->event == NULL || tev->group == NULL) | |
2707 | return -ENOMEM; | |
2708 | ||
2709 | /* Add added event name to namelist */ | |
2710 | strlist__add(namelist, event); | |
2711 | return 0; | |
2712 | } | |
2713 | ||
1de7b8bf MH |
2714 | static int __open_probe_file_and_namelist(bool uprobe, |
2715 | struct strlist **namelist) | |
50656eec | 2716 | { |
1de7b8bf | 2717 | int fd; |
50656eec | 2718 | |
1de7b8bf | 2719 | fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0)); |
92f6c72e | 2720 | if (fd < 0) |
146a1439 | 2721 | return fd; |
5e45187c | 2722 | |
b498ce1f | 2723 | /* Get current event names */ |
1de7b8bf MH |
2724 | *namelist = probe_file__get_namelist(fd); |
2725 | if (!(*namelist)) { | |
146a1439 | 2726 | pr_debug("Failed to get current event list.\n"); |
1de7b8bf MH |
2727 | close(fd); |
2728 | return -ENOMEM; | |
146a1439 | 2729 | } |
1de7b8bf MH |
2730 | return fd; |
2731 | } | |
2732 | ||
2733 | static int __add_probe_trace_events(struct perf_probe_event *pev, | |
2734 | struct probe_trace_event *tevs, | |
2735 | int ntevs, bool allow_suffix) | |
2736 | { | |
2737 | int i, fd[2] = {-1, -1}, up, ret; | |
2738 | struct probe_trace_event *tev = NULL; | |
2739 | struct probe_cache *cache = NULL; | |
2740 | struct strlist *namelist[2] = {NULL, NULL}; | |
544abd44 | 2741 | struct nscookie nsc; |
1de7b8bf MH |
2742 | |
2743 | up = pev->uprobes ? 1 : 0; | |
2744 | fd[up] = __open_probe_file_and_namelist(up, &namelist[up]); | |
2745 | if (fd[up] < 0) | |
2746 | return fd[up]; | |
4235b045 | 2747 | |
146a1439 | 2748 | ret = 0; |
02b95dad | 2749 | for (i = 0; i < ntevs; i++) { |
4235b045 | 2750 | tev = &tevs[i]; |
1de7b8bf MH |
2751 | up = tev->uprobes ? 1 : 0; |
2752 | if (fd[up] == -1) { /* Open the kprobe/uprobe_events */ | |
2753 | fd[up] = __open_probe_file_and_namelist(up, | |
2754 | &namelist[up]); | |
2755 | if (fd[up] < 0) | |
2756 | goto close_out; | |
2757 | } | |
b031220d | 2758 | /* Skip if the symbol is out of .text or blacklisted */ |
bc062230 | 2759 | if (!tev->point.symbol && !pev->uprobes) |
5a51fcd1 | 2760 | continue; |
9aaf5a5f | 2761 | |
a3c9de62 | 2762 | /* Set new name for tev (and update namelist) */ |
1de7b8bf | 2763 | ret = probe_trace_event__set_name(tev, pev, namelist[up], |
a3c9de62 | 2764 | allow_suffix); |
146a1439 MH |
2765 | if (ret < 0) |
2766 | break; | |
4235b045 | 2767 | |
544abd44 | 2768 | nsinfo__mountns_enter(pev->nsi, &nsc); |
1de7b8bf | 2769 | ret = probe_file__add_event(fd[up], tev); |
544abd44 | 2770 | nsinfo__mountns_exit(&nsc); |
146a1439 MH |
2771 | if (ret < 0) |
2772 | break; | |
4235b045 | 2773 | |
4235b045 MH |
2774 | /* |
2775 | * Probes after the first probe which comes from same | |
2776 | * user input are always allowed to add suffix, because | |
2777 | * there might be several addresses corresponding to | |
2778 | * one code line. | |
2779 | */ | |
2780 | allow_suffix = true; | |
50656eec | 2781 | } |
79702f61 MH |
2782 | if (ret == -EINVAL && pev->uprobes) |
2783 | warn_uprobe_event_compat(tev); | |
2fd457a3 | 2784 | if (ret == 0 && probe_conf.cache) { |
f045b8c4 | 2785 | cache = probe_cache__new(pev->target, pev->nsi); |
2fd457a3 MH |
2786 | if (!cache || |
2787 | probe_cache__add_entry(cache, pev, tevs, ntevs) < 0 || | |
2788 | probe_cache__commit(cache) < 0) | |
2789 | pr_warning("Failed to add event to probe cache\n"); | |
2790 | probe_cache__delete(cache); | |
2791 | } | |
146a1439 | 2792 | |
ae2cb1ac | 2793 | close_out: |
1de7b8bf MH |
2794 | for (up = 0; up < 2; up++) { |
2795 | strlist__delete(namelist[up]); | |
2796 | if (fd[up] >= 0) | |
2797 | close(fd[up]); | |
2798 | } | |
146a1439 | 2799 | return ret; |
50656eec | 2800 | } |
fa28244d | 2801 | |
6bb536cc WN |
2802 | static int find_probe_functions(struct map *map, char *name, |
2803 | struct symbol **syms) | |
eb948e50 | 2804 | { |
564c62a4 | 2805 | int found = 0; |
0a3873a8 | 2806 | struct symbol *sym; |
4c859351 | 2807 | struct rb_node *tmp; |
4b3a2716 MH |
2808 | const char *norm, *ver; |
2809 | char *buf = NULL; | |
c588d158 | 2810 | bool cut_version = true; |
564c62a4 | 2811 | |
be39db9f | 2812 | if (map__load(map) < 0) |
75e4a2a6 WN |
2813 | return 0; |
2814 | ||
c588d158 MH |
2815 | /* If user gives a version, don't cut off the version from symbols */ |
2816 | if (strchr(name, '@')) | |
2817 | cut_version = false; | |
2818 | ||
4c859351 | 2819 | map__for_each_symbol(map, sym, tmp) { |
4b3a2716 MH |
2820 | norm = arch__normalize_symbol_name(sym->name); |
2821 | if (!norm) | |
2822 | continue; | |
2823 | ||
c588d158 MH |
2824 | if (cut_version) { |
2825 | /* We don't care about default symbol or not */ | |
2826 | ver = strchr(norm, '@'); | |
2827 | if (ver) { | |
2828 | buf = strndup(norm, ver - norm); | |
2829 | if (!buf) | |
2830 | return -ENOMEM; | |
2831 | norm = buf; | |
2832 | } | |
4b3a2716 | 2833 | } |
c588d158 | 2834 | |
4b3a2716 | 2835 | if (strglobmatch(norm, name)) { |
4c859351 | 2836 | found++; |
6bb536cc WN |
2837 | if (syms && found < probe_conf.max_probes) |
2838 | syms[found - 1] = sym; | |
2839 | } | |
4b3a2716 MH |
2840 | if (buf) |
2841 | zfree(&buf); | |
eb948e50 | 2842 | } |
564c62a4 NK |
2843 | |
2844 | return found; | |
eb948e50 MH |
2845 | } |
2846 | ||
7b6ff0bd NR |
2847 | void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, |
2848 | struct probe_trace_event *tev __maybe_unused, | |
0b3c2264 NR |
2849 | struct map *map __maybe_unused, |
2850 | struct symbol *sym __maybe_unused) { } | |
7b6ff0bd | 2851 | |
eb948e50 MH |
2852 | /* |
2853 | * Find probe function addresses from map. | |
2854 | * Return an error or the number of found probe_trace_event | |
2855 | */ | |
2856 | static int find_probe_trace_events_from_map(struct perf_probe_event *pev, | |
ddb2f58f | 2857 | struct probe_trace_event **tevs) |
e0faa8d3 | 2858 | { |
eb948e50 | 2859 | struct map *map = NULL; |
eb948e50 | 2860 | struct ref_reloc_sym *reloc_sym = NULL; |
e0faa8d3 | 2861 | struct symbol *sym; |
6bb536cc | 2862 | struct symbol **syms = NULL; |
0e60836b | 2863 | struct probe_trace_event *tev; |
eb948e50 MH |
2864 | struct perf_probe_point *pp = &pev->point; |
2865 | struct probe_trace_point *tp; | |
564c62a4 | 2866 | int num_matched_functions; |
b031220d | 2867 | int ret, i, j, skipped = 0; |
c61fb959 | 2868 | char *mod_name; |
4235b045 | 2869 | |
544abd44 | 2870 | map = get_target_map(pev->target, pev->nsi, pev->uprobes); |
eb948e50 MH |
2871 | if (!map) { |
2872 | ret = -EINVAL; | |
2873 | goto out; | |
fb7345bb MH |
2874 | } |
2875 | ||
6bb536cc WN |
2876 | syms = malloc(sizeof(struct symbol *) * probe_conf.max_probes); |
2877 | if (!syms) { | |
2878 | ret = -ENOMEM; | |
2879 | goto out; | |
2880 | } | |
2881 | ||
eb948e50 MH |
2882 | /* |
2883 | * Load matched symbols: Since the different local symbols may have | |
2884 | * same name but different addresses, this lists all the symbols. | |
2885 | */ | |
6bb536cc | 2886 | num_matched_functions = find_probe_functions(map, pp->function, syms); |
4b3a2716 | 2887 | if (num_matched_functions <= 0) { |
eb948e50 | 2888 | pr_err("Failed to find symbol %s in %s\n", pp->function, |
44225521 | 2889 | pev->target ? : "kernel"); |
eb948e50 MH |
2890 | ret = -ENOENT; |
2891 | goto out; | |
ddb2f58f | 2892 | } else if (num_matched_functions > probe_conf.max_probes) { |
eb948e50 | 2893 | pr_err("Too many functions matched in %s\n", |
44225521 | 2894 | pev->target ? : "kernel"); |
eb948e50 MH |
2895 | ret = -E2BIG; |
2896 | goto out; | |
fb7345bb MH |
2897 | } |
2898 | ||
1a8ac29c | 2899 | /* Note that the symbols in the kmodule are not relocated */ |
7ab31d94 NR |
2900 | if (!pev->uprobes && !pev->target && |
2901 | (!pp->retprobe || kretprobe_offset_is_supported())) { | |
0560a0c4 | 2902 | reloc_sym = kernel_get_ref_reloc_sym(); |
eb948e50 MH |
2903 | if (!reloc_sym) { |
2904 | pr_warning("Relocated base symbol is not found!\n"); | |
2905 | ret = -EINVAL; | |
2906 | goto out; | |
2907 | } | |
2908 | } | |
4235b045 | 2909 | |
eb948e50 MH |
2910 | /* Setup result trace-probe-events */ |
2911 | *tevs = zalloc(sizeof(*tev) * num_matched_functions); | |
2912 | if (!*tevs) { | |
02b95dad | 2913 | ret = -ENOMEM; |
eb948e50 | 2914 | goto out; |
02b95dad | 2915 | } |
ce27a443 | 2916 | |
eb948e50 | 2917 | ret = 0; |
564c62a4 | 2918 | |
6bb536cc WN |
2919 | for (j = 0; j < num_matched_functions; j++) { |
2920 | sym = syms[j]; | |
2921 | ||
eb948e50 MH |
2922 | tev = (*tevs) + ret; |
2923 | tp = &tev->point; | |
2924 | if (ret == num_matched_functions) { | |
2925 | pr_warning("Too many symbols are listed. Skip it.\n"); | |
2926 | break; | |
ce27a443 | 2927 | } |
eb948e50 | 2928 | ret++; |
ce27a443 | 2929 | |
eb948e50 MH |
2930 | if (pp->offset > sym->end - sym->start) { |
2931 | pr_warning("Offset %ld is bigger than the size of %s\n", | |
2932 | pp->offset, sym->name); | |
2933 | ret = -ENOENT; | |
2934 | goto err_out; | |
2935 | } | |
2936 | /* Add one probe point */ | |
2937 | tp->address = map->unmap_ip(map, sym->start) + pp->offset; | |
1a8ac29c MH |
2938 | |
2939 | /* Check the kprobe (not in module) is within .text */ | |
2940 | if (!pev->uprobes && !pev->target && | |
b031220d MH |
2941 | kprobe_warn_out_range(sym->name, tp->address)) { |
2942 | tp->symbol = NULL; /* Skip it */ | |
2943 | skipped++; | |
2944 | } else if (reloc_sym) { | |
eb948e50 MH |
2945 | tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); |
2946 | tp->offset = tp->address - reloc_sym->addr; | |
2947 | } else { | |
2948 | tp->symbol = strdup_or_goto(sym->name, nomem_out); | |
2949 | tp->offset = pp->offset; | |
2950 | } | |
6bb536cc WN |
2951 | tp->realname = strdup_or_goto(sym->name, nomem_out); |
2952 | ||
eb948e50 | 2953 | tp->retprobe = pp->retprobe; |
c61fb959 RB |
2954 | if (pev->target) { |
2955 | if (pev->uprobes) { | |
2956 | tev->point.module = strdup_or_goto(pev->target, | |
2957 | nomem_out); | |
2958 | } else { | |
2959 | mod_name = find_module_name(pev->target); | |
2960 | tev->point.module = | |
2961 | strdup(mod_name ? mod_name : pev->target); | |
2962 | free(mod_name); | |
2963 | if (!tev->point.module) | |
2964 | goto nomem_out; | |
2965 | } | |
2966 | } | |
eb948e50 MH |
2967 | tev->uprobes = pev->uprobes; |
2968 | tev->nargs = pev->nargs; | |
2969 | if (tev->nargs) { | |
2970 | tev->args = zalloc(sizeof(struct probe_trace_arg) * | |
2971 | tev->nargs); | |
2972 | if (tev->args == NULL) | |
2973 | goto nomem_out; | |
e334016f | 2974 | } |
48481938 | 2975 | for (i = 0; i < tev->nargs; i++) { |
eb948e50 MH |
2976 | if (pev->args[i].name) |
2977 | tev->args[i].name = | |
2978 | strdup_or_goto(pev->args[i].name, | |
2979 | nomem_out); | |
2980 | ||
2981 | tev->args[i].value = strdup_or_goto(pev->args[i].var, | |
2982 | nomem_out); | |
2983 | if (pev->args[i].type) | |
2984 | tev->args[i].type = | |
2985 | strdup_or_goto(pev->args[i].type, | |
2986 | nomem_out); | |
48481938 | 2987 | } |
0b3c2264 | 2988 | arch__fix_tev_from_maps(pev, tev, map, sym); |
4235b045 | 2989 | } |
b031220d MH |
2990 | if (ret == skipped) { |
2991 | ret = -ENOENT; | |
2992 | goto err_out; | |
2993 | } | |
4235b045 | 2994 | |
eb948e50 | 2995 | out: |
eebc509b | 2996 | map__put(map); |
6bb536cc | 2997 | free(syms); |
eb948e50 | 2998 | return ret; |
225466f1 | 2999 | |
eb948e50 MH |
3000 | nomem_out: |
3001 | ret = -ENOMEM; | |
3002 | err_out: | |
3003 | clear_probe_trace_events(*tevs, num_matched_functions); | |
3004 | zfree(tevs); | |
3005 | goto out; | |
3006 | } | |
1c1bc922 | 3007 | |
da15bd9d WN |
3008 | static int try_to_find_absolute_address(struct perf_probe_event *pev, |
3009 | struct probe_trace_event **tevs) | |
3010 | { | |
3011 | struct perf_probe_point *pp = &pev->point; | |
3012 | struct probe_trace_event *tev; | |
3013 | struct probe_trace_point *tp; | |
3014 | int i, err; | |
3015 | ||
3016 | if (!(pev->point.function && !strncmp(pev->point.function, "0x", 2))) | |
3017 | return -EINVAL; | |
3018 | if (perf_probe_event_need_dwarf(pev)) | |
3019 | return -EINVAL; | |
3020 | ||
3021 | /* | |
3022 | * This is 'perf probe /lib/libc.so 0xabcd'. Try to probe at | |
3023 | * absolute address. | |
3024 | * | |
3025 | * Only one tev can be generated by this. | |
3026 | */ | |
3027 | *tevs = zalloc(sizeof(*tev)); | |
3028 | if (!*tevs) | |
3029 | return -ENOMEM; | |
3030 | ||
3031 | tev = *tevs; | |
3032 | tp = &tev->point; | |
3033 | ||
3034 | /* | |
3035 | * Don't use tp->offset, use address directly, because | |
3036 | * in synthesize_probe_trace_command() address cannot be | |
3037 | * zero. | |
3038 | */ | |
3039 | tp->address = pev->point.abs_address; | |
3040 | tp->retprobe = pp->retprobe; | |
3041 | tev->uprobes = pev->uprobes; | |
3042 | ||
3043 | err = -ENOMEM; | |
3044 | /* | |
3045 | * Give it a '0x' leading symbol name. | |
3046 | * In __add_probe_trace_events, a NULL symbol is interpreted as | |
3047 | * invalud. | |
3048 | */ | |
3049 | if (asprintf(&tp->symbol, "0x%lx", tp->address) < 0) | |
3050 | goto errout; | |
3051 | ||
3052 | /* For kprobe, check range */ | |
3053 | if ((!tev->uprobes) && | |
3054 | (kprobe_warn_out_range(tev->point.symbol, | |
3055 | tev->point.address))) { | |
3056 | err = -EACCES; | |
3057 | goto errout; | |
3058 | } | |
3059 | ||
3060 | if (asprintf(&tp->realname, "abs_%lx", tp->address) < 0) | |
3061 | goto errout; | |
3062 | ||
3063 | if (pev->target) { | |
3064 | tp->module = strdup(pev->target); | |
3065 | if (!tp->module) | |
3066 | goto errout; | |
3067 | } | |
3068 | ||
3069 | if (tev->group) { | |
3070 | tev->group = strdup(pev->group); | |
3071 | if (!tev->group) | |
3072 | goto errout; | |
3073 | } | |
3074 | ||
3075 | if (pev->event) { | |
3076 | tev->event = strdup(pev->event); | |
3077 | if (!tev->event) | |
3078 | goto errout; | |
3079 | } | |
3080 | ||
3081 | tev->nargs = pev->nargs; | |
3082 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
d1d0e29c | 3083 | if (!tev->args) |
da15bd9d | 3084 | goto errout; |
d1d0e29c | 3085 | |
da15bd9d WN |
3086 | for (i = 0; i < tev->nargs; i++) |
3087 | copy_to_probe_trace_arg(&tev->args[i], &pev->args[i]); | |
3088 | ||
3089 | return 1; | |
3090 | ||
3091 | errout: | |
42e233ca ME |
3092 | clear_probe_trace_events(*tevs, 1); |
3093 | *tevs = NULL; | |
da15bd9d WN |
3094 | return err; |
3095 | } | |
3096 | ||
42bba263 MH |
3097 | /* Concatinate two arrays */ |
3098 | static void *memcat(void *a, size_t sz_a, void *b, size_t sz_b) | |
3099 | { | |
3100 | void *ret; | |
3101 | ||
3102 | ret = malloc(sz_a + sz_b); | |
3103 | if (ret) { | |
3104 | memcpy(ret, a, sz_a); | |
3105 | memcpy(ret + sz_a, b, sz_b); | |
3106 | } | |
3107 | return ret; | |
3108 | } | |
3109 | ||
3110 | static int | |
3111 | concat_probe_trace_events(struct probe_trace_event **tevs, int *ntevs, | |
3112 | struct probe_trace_event **tevs2, int ntevs2) | |
3113 | { | |
3114 | struct probe_trace_event *new_tevs; | |
3115 | int ret = 0; | |
3116 | ||
f0a30dca | 3117 | if (*ntevs == 0) { |
42bba263 MH |
3118 | *tevs = *tevs2; |
3119 | *ntevs = ntevs2; | |
3120 | *tevs2 = NULL; | |
3121 | return 0; | |
3122 | } | |
3123 | ||
3124 | if (*ntevs + ntevs2 > probe_conf.max_probes) | |
3125 | ret = -E2BIG; | |
3126 | else { | |
3127 | /* Concatinate the array of probe_trace_event */ | |
3128 | new_tevs = memcat(*tevs, (*ntevs) * sizeof(**tevs), | |
3129 | *tevs2, ntevs2 * sizeof(**tevs2)); | |
3130 | if (!new_tevs) | |
3131 | ret = -ENOMEM; | |
3132 | else { | |
3133 | free(*tevs); | |
3134 | *tevs = new_tevs; | |
3135 | *ntevs += ntevs2; | |
3136 | } | |
3137 | } | |
3138 | if (ret < 0) | |
3139 | clear_probe_trace_events(*tevs2, ntevs2); | |
3140 | zfree(tevs2); | |
3141 | ||
3142 | return ret; | |
3143 | } | |
3144 | ||
3145 | /* | |
3146 | * Try to find probe_trace_event from given probe caches. Return the number | |
3147 | * of cached events found, if an error occurs return the error. | |
3148 | */ | |
3149 | static int find_cached_events(struct perf_probe_event *pev, | |
3150 | struct probe_trace_event **tevs, | |
3151 | const char *target) | |
3152 | { | |
3153 | struct probe_cache *cache; | |
3154 | struct probe_cache_entry *entry; | |
3155 | struct probe_trace_event *tmp_tevs = NULL; | |
3156 | int ntevs = 0; | |
3157 | int ret = 0; | |
3158 | ||
f045b8c4 | 3159 | cache = probe_cache__new(target, pev->nsi); |
42bba263 MH |
3160 | /* Return 0 ("not found") if the target has no probe cache. */ |
3161 | if (!cache) | |
3162 | return 0; | |
3163 | ||
3164 | for_each_probe_cache_entry(entry, cache) { | |
3165 | /* Skip the cache entry which has no name */ | |
3166 | if (!entry->pev.event || !entry->pev.group) | |
3167 | continue; | |
3168 | if ((!pev->group || strglobmatch(entry->pev.group, pev->group)) && | |
3169 | strglobmatch(entry->pev.event, pev->event)) { | |
3170 | ret = probe_cache_entry__get_event(entry, &tmp_tevs); | |
3171 | if (ret > 0) | |
3172 | ret = concat_probe_trace_events(tevs, &ntevs, | |
3173 | &tmp_tevs, ret); | |
3174 | if (ret < 0) | |
3175 | break; | |
3176 | } | |
3177 | } | |
3178 | probe_cache__delete(cache); | |
3179 | if (ret < 0) { | |
3180 | clear_probe_trace_events(*tevs, ntevs); | |
3181 | zfree(tevs); | |
3182 | } else { | |
3183 | ret = ntevs; | |
3184 | if (ntevs > 0 && target && target[0] == '/') | |
3185 | pev->uprobes = true; | |
3186 | } | |
3187 | ||
3188 | return ret; | |
3189 | } | |
3190 | ||
1de7b8bf MH |
3191 | /* Try to find probe_trace_event from all probe caches */ |
3192 | static int find_cached_events_all(struct perf_probe_event *pev, | |
3193 | struct probe_trace_event **tevs) | |
3194 | { | |
3195 | struct probe_trace_event *tmp_tevs = NULL; | |
3196 | struct strlist *bidlist; | |
3197 | struct str_node *nd; | |
3198 | char *pathname; | |
3199 | int ntevs = 0; | |
3200 | int ret; | |
3201 | ||
3202 | /* Get the buildid list of all valid caches */ | |
3203 | bidlist = build_id_cache__list_all(true); | |
3204 | if (!bidlist) { | |
3205 | ret = -errno; | |
3206 | pr_debug("Failed to get buildids: %d\n", ret); | |
3207 | return ret; | |
3208 | } | |
3209 | ||
3210 | ret = 0; | |
3211 | strlist__for_each_entry(nd, bidlist) { | |
3212 | pathname = build_id_cache__origname(nd->s); | |
3213 | ret = find_cached_events(pev, &tmp_tevs, pathname); | |
3214 | /* In the case of cnt == 0, we just skip it */ | |
3215 | if (ret > 0) | |
3216 | ret = concat_probe_trace_events(tevs, &ntevs, | |
3217 | &tmp_tevs, ret); | |
3218 | free(pathname); | |
3219 | if (ret < 0) | |
3220 | break; | |
3221 | } | |
3222 | strlist__delete(bidlist); | |
3223 | ||
3224 | if (ret < 0) { | |
3225 | clear_probe_trace_events(*tevs, ntevs); | |
3226 | zfree(tevs); | |
3227 | } else | |
3228 | ret = ntevs; | |
3229 | ||
3230 | return ret; | |
3231 | } | |
3232 | ||
bc062230 MH |
3233 | static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, |
3234 | struct probe_trace_event **tevs) | |
3235 | { | |
3236 | struct probe_cache *cache; | |
3237 | struct probe_cache_entry *entry; | |
3238 | struct probe_trace_event *tev; | |
3239 | struct str_node *node; | |
3240 | int ret, i; | |
3241 | ||
1de7b8bf | 3242 | if (pev->sdt) { |
42bba263 | 3243 | /* For SDT/cached events, we use special search functions */ |
1de7b8bf MH |
3244 | if (!pev->target) |
3245 | return find_cached_events_all(pev, tevs); | |
3246 | else | |
3247 | return find_cached_events(pev, tevs, pev->target); | |
3248 | } | |
f045b8c4 | 3249 | cache = probe_cache__new(pev->target, pev->nsi); |
bc062230 MH |
3250 | if (!cache) |
3251 | return 0; | |
3252 | ||
3253 | entry = probe_cache__find(cache, pev); | |
3254 | if (!entry) { | |
36a009fe MH |
3255 | /* SDT must be in the cache */ |
3256 | ret = pev->sdt ? -ENOENT : 0; | |
bc062230 MH |
3257 | goto out; |
3258 | } | |
3259 | ||
3260 | ret = strlist__nr_entries(entry->tevlist); | |
3261 | if (ret > probe_conf.max_probes) { | |
3262 | pr_debug("Too many entries matched in the cache of %s\n", | |
3263 | pev->target ? : "kernel"); | |
3264 | ret = -E2BIG; | |
3265 | goto out; | |
3266 | } | |
3267 | ||
3268 | *tevs = zalloc(ret * sizeof(*tev)); | |
3269 | if (!*tevs) { | |
3270 | ret = -ENOMEM; | |
3271 | goto out; | |
3272 | } | |
3273 | ||
3274 | i = 0; | |
3275 | strlist__for_each_entry(node, entry->tevlist) { | |
3276 | tev = &(*tevs)[i++]; | |
3277 | ret = parse_probe_trace_command(node->s, tev); | |
3278 | if (ret < 0) | |
3279 | goto out; | |
3280 | /* Set the uprobes attribute as same as original */ | |
3281 | tev->uprobes = pev->uprobes; | |
3282 | } | |
3283 | ret = i; | |
3284 | ||
3285 | out: | |
3286 | probe_cache__delete(cache); | |
3287 | return ret; | |
3288 | } | |
3289 | ||
eb948e50 | 3290 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
ddb2f58f | 3291 | struct probe_trace_event **tevs) |
eb948e50 MH |
3292 | { |
3293 | int ret; | |
3294 | ||
36a009fe | 3295 | if (!pev->group && !pev->sdt) { |
2a12ec13 MH |
3296 | /* Set group name if not given */ |
3297 | if (!pev->uprobes) { | |
3298 | pev->group = strdup(PERFPROBE_GROUP); | |
3299 | ret = pev->group ? 0 : -ENOMEM; | |
3300 | } else | |
3301 | ret = convert_exec_to_group(pev->target, &pev->group); | |
eb948e50 MH |
3302 | if (ret != 0) { |
3303 | pr_warning("Failed to make a group name.\n"); | |
3304 | return ret; | |
3305 | } | |
02b95dad | 3306 | } |
e334016f | 3307 | |
da15bd9d WN |
3308 | ret = try_to_find_absolute_address(pev, tevs); |
3309 | if (ret > 0) | |
3310 | return ret; | |
3311 | ||
bc062230 MH |
3312 | /* At first, we need to lookup cache entry */ |
3313 | ret = find_probe_trace_events_from_cache(pev, tevs); | |
36a009fe MH |
3314 | if (ret > 0 || pev->sdt) /* SDT can be found only in the cache */ |
3315 | return ret == 0 ? -ENOENT : ret; /* Found in probe cache */ | |
bc062230 | 3316 | |
eb948e50 | 3317 | /* Convert perf_probe_event with debuginfo */ |
ddb2f58f | 3318 | ret = try_to_find_probe_trace_events(pev, tevs); |
eb948e50 MH |
3319 | if (ret != 0) |
3320 | return ret; /* Found in debuginfo or got an error */ | |
3321 | ||
ddb2f58f | 3322 | return find_probe_trace_events_from_map(pev, tevs); |
4235b045 MH |
3323 | } |
3324 | ||
12fae5ef | 3325 | int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
4235b045 | 3326 | { |
844dffa5 | 3327 | int i, ret; |
4235b045 | 3328 | |
4235b045 MH |
3329 | /* Loop 1: convert all events */ |
3330 | for (i = 0; i < npevs; i++) { | |
b031220d | 3331 | /* Init kprobe blacklist if needed */ |
12fae5ef | 3332 | if (!pevs[i].uprobes) |
b031220d | 3333 | kprobe_blacklist__init(); |
4235b045 | 3334 | /* Convert with or without debuginfo */ |
12fae5ef | 3335 | ret = convert_to_probe_trace_events(&pevs[i], &pevs[i].tevs); |
146a1439 | 3336 | if (ret < 0) |
844dffa5 | 3337 | return ret; |
12fae5ef | 3338 | pevs[i].ntevs = ret; |
e0faa8d3 | 3339 | } |
b031220d MH |
3340 | /* This just release blacklist only if allocated */ |
3341 | kprobe_blacklist__release(); | |
e0faa8d3 | 3342 | |
844dffa5 NK |
3343 | return 0; |
3344 | } | |
3345 | ||
1c20b1d1 MH |
3346 | static int show_probe_trace_event(struct probe_trace_event *tev) |
3347 | { | |
3348 | char *buf = synthesize_probe_trace_command(tev); | |
3349 | ||
3350 | if (!buf) { | |
3351 | pr_debug("Failed to synthesize probe trace event.\n"); | |
3352 | return -EINVAL; | |
3353 | } | |
3354 | ||
3355 | /* Showing definition always go stdout */ | |
3356 | printf("%s\n", buf); | |
3357 | free(buf); | |
3358 | ||
3359 | return 0; | |
3360 | } | |
3361 | ||
3362 | int show_probe_trace_events(struct perf_probe_event *pevs, int npevs) | |
3363 | { | |
3364 | struct strlist *namelist = strlist__new(NULL, NULL); | |
3365 | struct probe_trace_event *tev; | |
3366 | struct perf_probe_event *pev; | |
3367 | int i, j, ret = 0; | |
3368 | ||
3369 | if (!namelist) | |
3370 | return -ENOMEM; | |
3371 | ||
3372 | for (j = 0; j < npevs && !ret; j++) { | |
3373 | pev = &pevs[j]; | |
3374 | for (i = 0; i < pev->ntevs && !ret; i++) { | |
3375 | tev = &pev->tevs[i]; | |
3376 | /* Skip if the symbol is out of .text or blacklisted */ | |
3377 | if (!tev->point.symbol && !pev->uprobes) | |
3378 | continue; | |
3379 | ||
3380 | /* Set new name for tev (and update namelist) */ | |
3381 | ret = probe_trace_event__set_name(tev, pev, | |
3382 | namelist, true); | |
3383 | if (!ret) | |
3384 | ret = show_probe_trace_event(tev); | |
3385 | } | |
3386 | } | |
3387 | strlist__delete(namelist); | |
3388 | ||
3389 | return ret; | |
3390 | } | |
3391 | ||
12fae5ef | 3392 | int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
3393 | { |
3394 | int i, ret = 0; | |
3395 | ||
4235b045 | 3396 | /* Loop 2: add all events */ |
8635bf6e | 3397 | for (i = 0; i < npevs; i++) { |
12fae5ef WN |
3398 | ret = __add_probe_trace_events(&pevs[i], pevs[i].tevs, |
3399 | pevs[i].ntevs, | |
ddb2f58f | 3400 | probe_conf.force_add); |
fbee632d ACM |
3401 | if (ret < 0) |
3402 | break; | |
3403 | } | |
844dffa5 NK |
3404 | return ret; |
3405 | } | |
3406 | ||
12fae5ef | 3407 | void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs) |
844dffa5 NK |
3408 | { |
3409 | int i, j; | |
544abd44 | 3410 | struct perf_probe_event *pev; |
844dffa5 | 3411 | |
449e5b24 MH |
3412 | /* Loop 3: cleanup and free trace events */ |
3413 | for (i = 0; i < npevs; i++) { | |
544abd44 | 3414 | pev = &pevs[i]; |
12fae5ef WN |
3415 | for (j = 0; j < pevs[i].ntevs; j++) |
3416 | clear_probe_trace_event(&pevs[i].tevs[j]); | |
3417 | zfree(&pevs[i].tevs); | |
3418 | pevs[i].ntevs = 0; | |
544abd44 | 3419 | nsinfo__zput(pev->nsi); |
a43aac29 | 3420 | clear_perf_probe_event(&pevs[i]); |
449e5b24 | 3421 | } |
844dffa5 NK |
3422 | } |
3423 | ||
3424 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs) | |
3425 | { | |
3426 | int ret; | |
844dffa5 | 3427 | |
9bae1e8c NK |
3428 | ret = init_probe_symbol_maps(pevs->uprobes); |
3429 | if (ret < 0) | |
3430 | return ret; | |
3431 | ||
12fae5ef | 3432 | ret = convert_perf_probe_events(pevs, npevs); |
844dffa5 | 3433 | if (ret == 0) |
12fae5ef | 3434 | ret = apply_perf_probe_events(pevs, npevs); |
844dffa5 | 3435 | |
12fae5ef | 3436 | cleanup_perf_probe_events(pevs, npevs); |
146a1439 | 3437 | |
9bae1e8c | 3438 | exit_probe_symbol_maps(); |
146a1439 | 3439 | return ret; |
e0faa8d3 MH |
3440 | } |
3441 | ||
307a464b | 3442 | int del_perf_probe_events(struct strfilter *filter) |
fa28244d | 3443 | { |
307a464b | 3444 | int ret, ret2, ufd = -1, kfd = -1; |
307a464b MH |
3445 | char *str = strfilter__string(filter); |
3446 | ||
3447 | if (!str) | |
3448 | return -EINVAL; | |
3449 | ||
fa28244d | 3450 | /* Get current event names */ |
92f6c72e MH |
3451 | ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW); |
3452 | if (ret < 0) | |
3453 | goto out; | |
467ec085 | 3454 | |
92f6c72e | 3455 | ret = probe_file__del_events(kfd, filter); |
307a464b | 3456 | if (ret < 0 && ret != -ENOENT) |
225466f1 | 3457 | goto error; |
225466f1 | 3458 | |
92f6c72e | 3459 | ret2 = probe_file__del_events(ufd, filter); |
dddc7ee3 | 3460 | if (ret2 < 0 && ret2 != -ENOENT) { |
307a464b | 3461 | ret = ret2; |
dddc7ee3 MH |
3462 | goto error; |
3463 | } | |
dddc7ee3 | 3464 | ret = 0; |
225466f1 SD |
3465 | |
3466 | error: | |
92f6c72e | 3467 | if (kfd >= 0) |
225466f1 | 3468 | close(kfd); |
92f6c72e | 3469 | if (ufd >= 0) |
225466f1 | 3470 | close(ufd); |
92f6c72e | 3471 | out: |
307a464b | 3472 | free(str); |
146a1439 MH |
3473 | |
3474 | return ret; | |
fa28244d | 3475 | } |
225466f1 | 3476 | |
544abd44 KJ |
3477 | int show_available_funcs(const char *target, struct nsinfo *nsi, |
3478 | struct strfilter *_filter, bool user) | |
e80711ca | 3479 | { |
fd227598 | 3480 | struct rb_node *nd; |
e80711ca MH |
3481 | struct map *map; |
3482 | int ret; | |
3483 | ||
9bae1e8c | 3484 | ret = init_probe_symbol_maps(user); |
e80711ca MH |
3485 | if (ret < 0) |
3486 | return ret; | |
3487 | ||
2df58634 | 3488 | /* Get a symbol map */ |
544abd44 | 3489 | map = get_target_map(target, nsi, user); |
e80711ca | 3490 | if (!map) { |
2df58634 | 3491 | pr_err("Failed to get a map for %s\n", (target) ? : "kernel"); |
e80711ca MH |
3492 | return -EINVAL; |
3493 | } | |
225466f1 | 3494 | |
be39db9f | 3495 | ret = map__load(map); |
e7049342 MH |
3496 | if (ret) { |
3497 | if (ret == -2) { | |
3498 | char *str = strfilter__string(_filter); | |
3499 | pr_err("Failed to find symbols matched to \"%s\"\n", | |
3500 | str); | |
3501 | free(str); | |
3502 | } else | |
3503 | pr_err("Failed to load symbols in %s\n", | |
3504 | (target) ? : "kernel"); | |
2df58634 MH |
3505 | goto end; |
3506 | } | |
3507 | if (!dso__sorted_by_name(map->dso, map->type)) | |
3508 | dso__sort_by_name(map->dso, map->type); | |
225466f1 | 3509 | |
2df58634 MH |
3510 | /* Show all (filtered) symbols */ |
3511 | setup_pager(); | |
fd227598 ACM |
3512 | |
3513 | for (nd = rb_first(&map->dso->symbol_names[map->type]); nd; nd = rb_next(nd)) { | |
3514 | struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); | |
3515 | ||
3516 | if (strfilter__compare(_filter, pos->sym.name)) | |
3517 | printf("%s\n", pos->sym.name); | |
3518 | } | |
3519 | ||
2df58634 | 3520 | end: |
eebc509b | 3521 | map__put(map); |
9bae1e8c | 3522 | exit_probe_symbol_maps(); |
225466f1 | 3523 | |
2df58634 | 3524 | return ret; |
225466f1 SD |
3525 | } |
3526 | ||
da15bd9d WN |
3527 | int copy_to_probe_trace_arg(struct probe_trace_arg *tvar, |
3528 | struct perf_probe_arg *pvar) | |
3529 | { | |
3530 | tvar->value = strdup(pvar->var); | |
3531 | if (tvar->value == NULL) | |
3532 | return -ENOMEM; | |
3533 | if (pvar->type) { | |
3534 | tvar->type = strdup(pvar->type); | |
3535 | if (tvar->type == NULL) | |
3536 | return -ENOMEM; | |
3537 | } | |
3538 | if (pvar->name) { | |
3539 | tvar->name = strdup(pvar->name); | |
3540 | if (tvar->name == NULL) | |
3541 | return -ENOMEM; | |
3542 | } else | |
3543 | tvar->name = NULL; | |
3544 | return 0; | |
3545 | } |