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4ea42b18 MH |
1 | /* |
2 | * builtin-probe.c | |
3 | * | |
4 | * Builtin probe command: Set up probe events by C expression | |
5 | * | |
6 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
22 | */ | |
4ea42b18 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> | |
32 | ||
4ea42b18 MH |
33 | #include "perf.h" |
34 | #include "builtin.h" | |
35 | #include "util/util.h" | |
fa28244d | 36 | #include "util/strlist.h" |
bd09d7b5 | 37 | #include "util/strfilter.h" |
e0faa8d3 | 38 | #include "util/symbol.h" |
89c69c0e | 39 | #include "util/debug.h" |
96c96612 | 40 | #include "util/debugfs.h" |
4ea42b18 | 41 | #include "util/parse-options.h" |
4ea42b18 | 42 | #include "util/probe-finder.h" |
50656eec | 43 | #include "util/probe-event.h" |
4ea42b18 | 44 | |
bd09d7b5 | 45 | #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*" |
3c42258c | 46 | #define DEFAULT_FUNC_FILTER "!_*" |
4ea42b18 MH |
47 | |
48 | /* Session management structure */ | |
49 | static struct { | |
fac13fd5 | 50 | bool list_events; |
d761b08b | 51 | bool force_add; |
631c9def | 52 | bool show_lines; |
cf6eb489 | 53 | bool show_vars; |
fb8c5a56 | 54 | bool show_ext_vars; |
e80711ca | 55 | bool show_funcs; |
cf6eb489 | 56 | bool mod_events; |
225466f1 | 57 | bool uprobes; |
4235b045 MH |
58 | int nevents; |
59 | struct perf_probe_event events[MAX_PROBES]; | |
fa28244d | 60 | struct strlist *dellist; |
631c9def | 61 | struct line_range line_range; |
4eced234 | 62 | const char *target; |
ef4a3565 | 63 | int max_probe_points; |
bd09d7b5 | 64 | struct strfilter *filter; |
12a1fadb | 65 | } params; |
4ea42b18 | 66 | |
253977b0 | 67 | /* Parse an event definition. Note that any error must die. */ |
146a1439 | 68 | static int parse_probe_event(const char *str) |
4ea42b18 | 69 | { |
4235b045 | 70 | struct perf_probe_event *pev = ¶ms.events[params.nevents]; |
146a1439 | 71 | int ret; |
4ea42b18 | 72 | |
4235b045 | 73 | pr_debug("probe-definition(%d): %s\n", params.nevents, str); |
8a7ddad8 ACM |
74 | if (++params.nevents == MAX_PROBES) { |
75 | pr_err("Too many probes (> %d) were specified.", MAX_PROBES); | |
76 | return -1; | |
77 | } | |
4ea42b18 | 78 | |
225466f1 SD |
79 | pev->uprobes = params.uprobes; |
80 | ||
4235b045 | 81 | /* Parse a perf-probe command into event */ |
146a1439 | 82 | ret = parse_perf_probe_command(str, pev); |
4235b045 | 83 | pr_debug("%d arguments\n", pev->nargs); |
146a1439 MH |
84 | |
85 | return ret; | |
46ab4926 MH |
86 | } |
87 | ||
73eff9f5 SD |
88 | static int set_target(const char *ptr) |
89 | { | |
90 | int found = 0; | |
91 | const char *buf; | |
92 | ||
93 | /* | |
94 | * The first argument after options can be an absolute path | |
95 | * to an executable / library or kernel module. | |
96 | * | |
97 | * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH, | |
98 | * short module name. | |
99 | */ | |
100 | if (!params.target && ptr && *ptr == '/') { | |
101 | params.target = ptr; | |
102 | found = 1; | |
103 | buf = ptr + (strlen(ptr) - 3); | |
104 | ||
105 | if (strcmp(buf, ".ko")) | |
106 | params.uprobes = true; | |
107 | ||
108 | } | |
109 | ||
110 | return found; | |
111 | } | |
112 | ||
146a1439 | 113 | static int parse_probe_event_argv(int argc, const char **argv) |
d1bde3f7 | 114 | { |
73eff9f5 | 115 | int i, len, ret, found_target; |
d1bde3f7 MH |
116 | char *buf; |
117 | ||
73eff9f5 SD |
118 | found_target = set_target(argv[0]); |
119 | if (found_target && argc == 1) | |
120 | return 0; | |
121 | ||
d1bde3f7 MH |
122 | /* Bind up rest arguments */ |
123 | len = 0; | |
73eff9f5 SD |
124 | for (i = 0; i < argc; i++) { |
125 | if (i == 0 && found_target) | |
126 | continue; | |
127 | ||
d1bde3f7 | 128 | len += strlen(argv[i]) + 1; |
73eff9f5 | 129 | } |
8a7ddad8 ACM |
130 | buf = zalloc(len + 1); |
131 | if (buf == NULL) | |
132 | return -ENOMEM; | |
d1bde3f7 | 133 | len = 0; |
73eff9f5 SD |
134 | for (i = 0; i < argc; i++) { |
135 | if (i == 0 && found_target) | |
136 | continue; | |
137 | ||
d1bde3f7 | 138 | len += sprintf(&buf[len], "%s ", argv[i]); |
73eff9f5 | 139 | } |
cf6eb489 | 140 | params.mod_events = true; |
146a1439 | 141 | ret = parse_probe_event(buf); |
d1bde3f7 | 142 | free(buf); |
146a1439 | 143 | return ret; |
d1bde3f7 MH |
144 | } |
145 | ||
253977b0 | 146 | static int opt_add_probe_event(const struct option *opt __used, |
46ab4926 MH |
147 | const char *str, int unset __used) |
148 | { | |
cf6eb489 MH |
149 | if (str) { |
150 | params.mod_events = true; | |
146a1439 | 151 | return parse_probe_event(str); |
cf6eb489 | 152 | } else |
146a1439 | 153 | return 0; |
4ea42b18 MH |
154 | } |
155 | ||
fa28244d MH |
156 | static int opt_del_probe_event(const struct option *opt __used, |
157 | const char *str, int unset __used) | |
158 | { | |
159 | if (str) { | |
cf6eb489 | 160 | params.mod_events = true; |
12a1fadb MH |
161 | if (!params.dellist) |
162 | params.dellist = strlist__new(true, NULL); | |
163 | strlist__add(params.dellist, str); | |
fa28244d MH |
164 | } |
165 | return 0; | |
166 | } | |
167 | ||
225466f1 SD |
168 | static int opt_set_target(const struct option *opt, const char *str, |
169 | int unset __used) | |
170 | { | |
171 | int ret = -ENOENT; | |
172 | ||
173 | if (str && !params.target) { | |
174 | if (!strcmp(opt->long_name, "exec")) | |
175 | params.uprobes = true; | |
176 | #ifdef DWARF_SUPPORT | |
177 | else if (!strcmp(opt->long_name, "module")) | |
178 | params.uprobes = false; | |
179 | #endif | |
180 | else | |
181 | return ret; | |
182 | ||
183 | params.target = str; | |
184 | ret = 0; | |
185 | } | |
186 | ||
187 | return ret; | |
188 | } | |
189 | ||
4b4da7f7 | 190 | #ifdef DWARF_SUPPORT |
0eda7385 HM |
191 | static int opt_show_lines(const struct option *opt __used, |
192 | const char *str, int unset __used) | |
193 | { | |
146a1439 MH |
194 | int ret = 0; |
195 | ||
13e27d76 MH |
196 | if (!str) |
197 | return 0; | |
198 | ||
199 | if (params.show_lines) { | |
200 | pr_warning("Warning: more than one --line options are" | |
201 | " detected. Only the first one is valid.\n"); | |
202 | return 0; | |
203 | } | |
204 | ||
12a1fadb | 205 | params.show_lines = true; |
13e27d76 MH |
206 | ret = parse_line_range_desc(str, ¶ms.line_range); |
207 | INIT_LIST_HEAD(¶ms.line_range.line_list); | |
146a1439 MH |
208 | |
209 | return ret; | |
0eda7385 | 210 | } |
cf6eb489 MH |
211 | |
212 | static int opt_show_vars(const struct option *opt __used, | |
213 | const char *str, int unset __used) | |
214 | { | |
215 | struct perf_probe_event *pev = ¶ms.events[params.nevents]; | |
216 | int ret; | |
217 | ||
218 | if (!str) | |
219 | return 0; | |
220 | ||
221 | ret = parse_probe_event(str); | |
222 | if (!ret && pev->nargs != 0) { | |
223 | pr_err(" Error: '--vars' doesn't accept arguments.\n"); | |
224 | return -EINVAL; | |
225 | } | |
226 | params.show_vars = true; | |
227 | ||
228 | return ret; | |
229 | } | |
3c42258c | 230 | #endif |
bd09d7b5 MH |
231 | |
232 | static int opt_set_filter(const struct option *opt __used, | |
233 | const char *str, int unset __used) | |
234 | { | |
235 | const char *err; | |
236 | ||
237 | if (str) { | |
238 | pr_debug2("Set filter: %s\n", str); | |
239 | if (params.filter) | |
240 | strfilter__delete(params.filter); | |
241 | params.filter = strfilter__new(str, &err); | |
242 | if (!params.filter) { | |
823c7164 | 243 | pr_err("Filter parse error at %td.\n", err - str + 1); |
bd09d7b5 MH |
244 | pr_err("Source: \"%s\"\n", str); |
245 | pr_err(" %*c\n", (int)(err - str + 1), '^'); | |
246 | return -EINVAL; | |
247 | } | |
248 | } | |
249 | ||
250 | return 0; | |
251 | } | |
4ea42b18 MH |
252 | |
253 | static const char * const probe_usage[] = { | |
46ab4926 MH |
254 | "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]", |
255 | "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]", | |
fa28244d | 256 | "perf probe [<options>] --del '[GROUP:]EVENT' ...", |
4de189fe | 257 | "perf probe --list", |
4b4da7f7 | 258 | #ifdef DWARF_SUPPORT |
469b9b88 MH |
259 | "perf probe [<options>] --line 'LINEDESC'", |
260 | "perf probe [<options>] --vars 'PROBEPOINT'", | |
f3ab481c | 261 | #endif |
4ea42b18 MH |
262 | NULL |
263 | }; | |
264 | ||
265 | static const struct option options[] = { | |
c0555642 | 266 | OPT_INCR('v', "verbose", &verbose, |
89c69c0e | 267 | "be more verbose (show parsed arguments, etc)"), |
12a1fadb | 268 | OPT_BOOLEAN('l', "list", ¶ms.list_events, |
fac13fd5 | 269 | "list up current probe events"), |
fa28244d MH |
270 | OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.", |
271 | opt_del_probe_event), | |
46ab4926 | 272 | OPT_CALLBACK('a', "add", NULL, |
4b4da7f7 | 273 | #ifdef DWARF_SUPPORT |
32cb0dd5 | 274 | "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT" |
48481938 | 275 | " [[NAME=]ARG ...]", |
4b4da7f7 | 276 | #else |
48481938 | 277 | "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]", |
23e8ec0d | 278 | #endif |
4ea42b18 | 279 | "probe point definition, where\n" |
af663d75 MH |
280 | "\t\tGROUP:\tGroup name (optional)\n" |
281 | "\t\tEVENT:\tEvent name\n" | |
4ea42b18 | 282 | "\t\tFUNC:\tFunction name\n" |
2a9c8c36 | 283 | "\t\tOFF:\tOffset from function entry (in byte)\n" |
253977b0 | 284 | "\t\t%return:\tPut the probe at function return\n" |
4b4da7f7 | 285 | #ifdef DWARF_SUPPORT |
4ea42b18 | 286 | "\t\tSRC:\tSource code path\n" |
2a9c8c36 MH |
287 | "\t\tRL:\tRelative line number from function entry.\n" |
288 | "\t\tAL:\tAbsolute line number in file.\n" | |
289 | "\t\tPT:\tLazy expression of line code.\n" | |
4ea42b18 | 290 | "\t\tARG:\tProbe argument (local variable name or\n" |
50656eec | 291 | "\t\t\tkprobe-tracer argument format.)\n", |
4b4da7f7 MH |
292 | #else |
293 | "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n", | |
294 | #endif | |
253977b0 | 295 | opt_add_probe_event), |
12a1fadb | 296 | OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events" |
d761b08b | 297 | " with existing name"), |
4b4da7f7 | 298 | #ifdef DWARF_SUPPORT |
631c9def | 299 | OPT_CALLBACK('L', "line", NULL, |
085ea739 | 300 | "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]", |
631c9def | 301 | "Show source code lines.", opt_show_lines), |
cf6eb489 MH |
302 | OPT_CALLBACK('V', "vars", NULL, |
303 | "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT", | |
304 | "Show accessible variables on PROBEDEF", opt_show_vars), | |
fb8c5a56 MH |
305 | OPT_BOOLEAN('\0', "externs", ¶ms.show_ext_vars, |
306 | "Show external variables too (with --vars only)"), | |
4b4da7f7 MH |
307 | OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, |
308 | "file", "vmlinux pathname"), | |
9ed7e1b8 CD |
309 | OPT_STRING('s', "source", &symbol_conf.source_prefix, |
310 | "directory", "path to kernel source"), | |
225466f1 SD |
311 | OPT_CALLBACK('m', "module", NULL, "modname|path", |
312 | "target module name (for online) or path (for offline)", | |
313 | opt_set_target), | |
631c9def | 314 | #endif |
f4d7da49 | 315 | OPT__DRY_RUN(&probe_event_dry_run), |
ef4a3565 MH |
316 | OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points, |
317 | "Set how many probe points can be found for a probe."), | |
e80711ca MH |
318 | OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs, |
319 | "Show potential probe-able functions."), | |
3c42258c MH |
320 | OPT_CALLBACK('\0', "filter", NULL, |
321 | "[!]FILTER", "Set a filter (with --vars/funcs only)\n" | |
322 | "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n" | |
323 | "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)", | |
324 | opt_set_filter), | |
225466f1 SD |
325 | OPT_CALLBACK('x', "exec", NULL, "executable|path", |
326 | "target executable name or path", opt_set_target), | |
4ea42b18 MH |
327 | OPT_END() |
328 | }; | |
329 | ||
4ea42b18 MH |
330 | int cmd_probe(int argc, const char **argv, const char *prefix __used) |
331 | { | |
146a1439 MH |
332 | int ret; |
333 | ||
4ea42b18 | 334 | argc = parse_options(argc, argv, options, probe_usage, |
46ab4926 | 335 | PARSE_OPT_STOP_AT_NON_OPTION); |
ce11a603 MH |
336 | if (argc > 0) { |
337 | if (strcmp(argv[0], "-") == 0) { | |
338 | pr_warning(" Error: '-' is not supported.\n"); | |
339 | usage_with_options(probe_usage, options); | |
340 | } | |
146a1439 MH |
341 | ret = parse_probe_event_argv(argc, argv); |
342 | if (ret < 0) { | |
343 | pr_err(" Error: Parse Error. (%d)\n", ret); | |
344 | return ret; | |
345 | } | |
ce11a603 | 346 | } |
46ab4926 | 347 | |
ef4a3565 MH |
348 | if (params.max_probe_points == 0) |
349 | params.max_probe_points = MAX_PROBES; | |
350 | ||
4235b045 | 351 | if ((!params.nevents && !params.dellist && !params.list_events && |
e80711ca | 352 | !params.show_lines && !params.show_funcs)) |
4ea42b18 MH |
353 | usage_with_options(probe_usage, options); |
354 | ||
fd930ff9 FBH |
355 | /* |
356 | * Only consider the user's kernel image path if given. | |
357 | */ | |
358 | symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL); | |
359 | ||
12a1fadb | 360 | if (params.list_events) { |
cf6eb489 | 361 | if (params.mod_events) { |
146a1439 | 362 | pr_err(" Error: Don't use --list with --add/--del.\n"); |
fa28244d MH |
363 | usage_with_options(probe_usage, options); |
364 | } | |
12a1fadb | 365 | if (params.show_lines) { |
146a1439 | 366 | pr_err(" Error: Don't use --list with --line.\n"); |
631c9def MH |
367 | usage_with_options(probe_usage, options); |
368 | } | |
cf6eb489 MH |
369 | if (params.show_vars) { |
370 | pr_err(" Error: Don't use --list with --vars.\n"); | |
371 | usage_with_options(probe_usage, options); | |
372 | } | |
e80711ca MH |
373 | if (params.show_funcs) { |
374 | pr_err(" Error: Don't use --list with --funcs.\n"); | |
375 | usage_with_options(probe_usage, options); | |
376 | } | |
225466f1 SD |
377 | if (params.uprobes) { |
378 | pr_warning(" Error: Don't use --list with --exec.\n"); | |
379 | usage_with_options(probe_usage, options); | |
380 | } | |
146a1439 MH |
381 | ret = show_perf_probe_events(); |
382 | if (ret < 0) | |
383 | pr_err(" Error: Failed to show event list. (%d)\n", | |
384 | ret); | |
385 | return ret; | |
4de189fe | 386 | } |
e80711ca MH |
387 | if (params.show_funcs) { |
388 | if (params.nevents != 0 || params.dellist) { | |
389 | pr_err(" Error: Don't use --funcs with" | |
390 | " --add/--del.\n"); | |
391 | usage_with_options(probe_usage, options); | |
392 | } | |
393 | if (params.show_lines) { | |
394 | pr_err(" Error: Don't use --funcs with --line.\n"); | |
395 | usage_with_options(probe_usage, options); | |
396 | } | |
397 | if (params.show_vars) { | |
398 | pr_err(" Error: Don't use --funcs with --vars.\n"); | |
399 | usage_with_options(probe_usage, options); | |
400 | } | |
3c42258c MH |
401 | if (!params.filter) |
402 | params.filter = strfilter__new(DEFAULT_FUNC_FILTER, | |
403 | NULL); | |
225466f1 SD |
404 | ret = show_available_funcs(params.target, params.filter, |
405 | params.uprobes); | |
3c42258c | 406 | strfilter__delete(params.filter); |
e80711ca MH |
407 | if (ret < 0) |
408 | pr_err(" Error: Failed to show functions." | |
409 | " (%d)\n", ret); | |
410 | return ret; | |
411 | } | |
4de189fe | 412 | |
4b4da7f7 | 413 | #ifdef DWARF_SUPPORT |
225466f1 | 414 | if (params.show_lines && !params.uprobes) { |
cf6eb489 MH |
415 | if (params.mod_events) { |
416 | pr_err(" Error: Don't use --line with" | |
417 | " --add/--del.\n"); | |
418 | usage_with_options(probe_usage, options); | |
419 | } | |
420 | if (params.show_vars) { | |
421 | pr_err(" Error: Don't use --line with --vars.\n"); | |
631c9def MH |
422 | usage_with_options(probe_usage, options); |
423 | } | |
e0faa8d3 | 424 | |
4eced234 | 425 | ret = show_line_range(¶ms.line_range, params.target); |
146a1439 MH |
426 | if (ret < 0) |
427 | pr_err(" Error: Failed to show lines. (%d)\n", ret); | |
428 | return ret; | |
631c9def | 429 | } |
cf6eb489 MH |
430 | if (params.show_vars) { |
431 | if (params.mod_events) { | |
432 | pr_err(" Error: Don't use --vars with" | |
433 | " --add/--del.\n"); | |
434 | usage_with_options(probe_usage, options); | |
435 | } | |
bd09d7b5 MH |
436 | if (!params.filter) |
437 | params.filter = strfilter__new(DEFAULT_VAR_FILTER, | |
438 | NULL); | |
439 | ||
cf6eb489 | 440 | ret = show_available_vars(params.events, params.nevents, |
fb8c5a56 | 441 | params.max_probe_points, |
4eced234 | 442 | params.target, |
bd09d7b5 | 443 | params.filter, |
fb8c5a56 | 444 | params.show_ext_vars); |
bd09d7b5 | 445 | strfilter__delete(params.filter); |
cf6eb489 MH |
446 | if (ret < 0) |
447 | pr_err(" Error: Failed to show vars. (%d)\n", ret); | |
448 | return ret; | |
449 | } | |
631c9def MH |
450 | #endif |
451 | ||
12a1fadb | 452 | if (params.dellist) { |
146a1439 | 453 | ret = del_perf_probe_events(params.dellist); |
12a1fadb | 454 | strlist__delete(params.dellist); |
146a1439 MH |
455 | if (ret < 0) { |
456 | pr_err(" Error: Failed to delete events. (%d)\n", ret); | |
457 | return ret; | |
458 | } | |
fa28244d MH |
459 | } |
460 | ||
146a1439 MH |
461 | if (params.nevents) { |
462 | ret = add_perf_probe_events(params.events, params.nevents, | |
c82ec0a2 | 463 | params.max_probe_points, |
4eced234 | 464 | params.target, |
c82ec0a2 | 465 | params.force_add); |
146a1439 MH |
466 | if (ret < 0) { |
467 | pr_err(" Error: Failed to add events. (%d)\n", ret); | |
468 | return ret; | |
469 | } | |
470 | } | |
4ea42b18 MH |
471 | return 0; |
472 | } |