Commit | Line | Data |
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50656eec MH |
1 | /* |
2 | * probe-event.c : perf-probe definition to kprobe_events format converter | |
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 | ||
22 | #define _GNU_SOURCE | |
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> | |
50656eec MH |
34 | |
35 | #undef _GNU_SOURCE | |
36 | #include "event.h" | |
e1c01d61 | 37 | #include "string.h" |
4de189fe | 38 | #include "strlist.h" |
50656eec | 39 | #include "debug.h" |
72041334 | 40 | #include "cache.h" |
631c9def | 41 | #include "color.h" |
50656eec MH |
42 | #include "parse-events.h" /* For debugfs_path */ |
43 | #include "probe-event.h" | |
44 | ||
45 | #define MAX_CMDLEN 256 | |
46 | #define MAX_PROBE_ARGS 128 | |
47 | #define PERFPROBE_GROUP "probe" | |
48 | ||
49 | #define semantic_error(msg ...) die("Semantic error :" msg) | |
50 | ||
4de189fe | 51 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
52 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
53 | __attribute__((format(printf, 3, 4))); | |
54 | ||
4de189fe MH |
55 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
56 | { | |
57 | int ret; | |
58 | va_list ap; | |
59 | va_start(ap, format); | |
60 | ret = vsnprintf(str, size, format, ap); | |
61 | va_end(ap); | |
62 | if (ret >= (int)size) | |
63 | ret = -E2BIG; | |
64 | return ret; | |
65 | } | |
66 | ||
631c9def MH |
67 | void parse_line_range_desc(const char *arg, struct line_range *lr) |
68 | { | |
69 | const char *ptr; | |
70 | char *tmp; | |
71 | /* | |
72 | * <Syntax> | |
73 | * SRC:SLN[+NUM|-ELN] | |
74 | * FUNC[:SLN[+NUM|-ELN]] | |
75 | */ | |
76 | ptr = strchr(arg, ':'); | |
77 | if (ptr) { | |
78 | lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0); | |
79 | if (*tmp == '+') | |
80 | lr->end = lr->start + (unsigned int)strtoul(tmp + 1, | |
81 | &tmp, 0); | |
82 | else if (*tmp == '-') | |
83 | lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0); | |
84 | else | |
85 | lr->end = 0; | |
86 | pr_debug("Line range is %u to %u\n", lr->start, lr->end); | |
87 | if (lr->end && lr->start > lr->end) | |
88 | semantic_error("Start line must be smaller" | |
89 | " than end line."); | |
90 | if (*tmp != '\0') | |
91 | semantic_error("Tailing with invalid character '%d'.", | |
92 | *tmp); | |
93 | tmp = strndup(arg, (ptr - arg)); | |
94 | } else | |
95 | tmp = strdup(arg); | |
96 | ||
97 | if (strchr(tmp, '.')) | |
98 | lr->file = tmp; | |
99 | else | |
100 | lr->function = tmp; | |
101 | } | |
102 | ||
b7702a21 MH |
103 | /* Check the name is good for event/group */ |
104 | static bool check_event_name(const char *name) | |
105 | { | |
106 | if (!isalpha(*name) && *name != '_') | |
107 | return false; | |
108 | while (*++name != '\0') { | |
109 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
110 | return false; | |
111 | } | |
112 | return true; | |
113 | } | |
114 | ||
50656eec MH |
115 | /* Parse probepoint definition. */ |
116 | static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp) | |
117 | { | |
118 | char *ptr, *tmp; | |
119 | char c, nc = 0; | |
120 | /* | |
121 | * <Syntax> | |
af663d75 MH |
122 | * perf probe [EVENT=]SRC:LN |
123 | * perf probe [EVENT=]FUNC[+OFFS|%return][@SRC] | |
124 | * | |
125 | * TODO:Group name support | |
50656eec MH |
126 | */ |
127 | ||
af663d75 MH |
128 | ptr = strchr(arg, '='); |
129 | if (ptr) { /* Event name */ | |
130 | *ptr = '\0'; | |
131 | tmp = ptr + 1; | |
132 | ptr = strchr(arg, ':'); | |
133 | if (ptr) /* Group name is not supported yet. */ | |
134 | semantic_error("Group name is not supported yet."); | |
b7702a21 MH |
135 | if (!check_event_name(arg)) |
136 | semantic_error("%s is bad for event name -it must " | |
137 | "follow C symbol-naming rule.", arg); | |
af663d75 MH |
138 | pp->event = strdup(arg); |
139 | arg = tmp; | |
140 | } | |
141 | ||
50656eec MH |
142 | ptr = strpbrk(arg, ":+@%"); |
143 | if (ptr) { | |
144 | nc = *ptr; | |
145 | *ptr++ = '\0'; | |
146 | } | |
147 | ||
148 | /* Check arg is function or file and copy it */ | |
149 | if (strchr(arg, '.')) /* File */ | |
150 | pp->file = strdup(arg); | |
151 | else /* Function */ | |
152 | pp->function = strdup(arg); | |
153 | DIE_IF(pp->file == NULL && pp->function == NULL); | |
154 | ||
155 | /* Parse other options */ | |
156 | while (ptr) { | |
157 | arg = ptr; | |
158 | c = nc; | |
159 | ptr = strpbrk(arg, ":+@%"); | |
160 | if (ptr) { | |
161 | nc = *ptr; | |
162 | *ptr++ = '\0'; | |
163 | } | |
164 | switch (c) { | |
165 | case ':': /* Line number */ | |
166 | pp->line = strtoul(arg, &tmp, 0); | |
167 | if (*tmp != '\0') | |
168 | semantic_error("There is non-digit charactor" | |
169 | " in line number."); | |
170 | break; | |
171 | case '+': /* Byte offset from a symbol */ | |
172 | pp->offset = strtoul(arg, &tmp, 0); | |
173 | if (*tmp != '\0') | |
174 | semantic_error("There is non-digit charactor" | |
175 | " in offset."); | |
176 | break; | |
177 | case '@': /* File name */ | |
178 | if (pp->file) | |
179 | semantic_error("SRC@SRC is not allowed."); | |
180 | pp->file = strdup(arg); | |
181 | DIE_IF(pp->file == NULL); | |
182 | if (ptr) | |
183 | semantic_error("@SRC must be the last " | |
184 | "option."); | |
185 | break; | |
186 | case '%': /* Probe places */ | |
187 | if (strcmp(arg, "return") == 0) { | |
188 | pp->retprobe = 1; | |
189 | } else /* Others not supported yet */ | |
190 | semantic_error("%%%s is not supported.", arg); | |
191 | break; | |
192 | default: | |
193 | DIE_IF("Program has a bug."); | |
194 | break; | |
195 | } | |
196 | } | |
197 | ||
198 | /* Exclusion check */ | |
199 | if (pp->line && pp->offset) | |
200 | semantic_error("Offset can't be used with line number."); | |
201 | ||
202 | if (!pp->line && pp->file && !pp->function) | |
203 | semantic_error("File always requires line number."); | |
204 | ||
205 | if (pp->offset && !pp->function) | |
206 | semantic_error("Offset requires an entry function."); | |
207 | ||
208 | if (pp->retprobe && !pp->function) | |
209 | semantic_error("Return probe requires an entry function."); | |
210 | ||
211 | if ((pp->offset || pp->line) && pp->retprobe) | |
212 | semantic_error("Offset/Line can't be used with return probe."); | |
213 | ||
214 | pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n", | |
215 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe); | |
216 | } | |
217 | ||
218 | /* Parse perf-probe event definition */ | |
fac13fd5 MH |
219 | void parse_perf_probe_event(const char *str, struct probe_point *pp, |
220 | bool *need_dwarf) | |
50656eec | 221 | { |
e1c01d61 | 222 | char **argv; |
fac13fd5 MH |
223 | int argc, i; |
224 | ||
225 | *need_dwarf = false; | |
50656eec | 226 | |
e1c01d61 MH |
227 | argv = argv_split(str, &argc); |
228 | if (!argv) | |
229 | die("argv_split failed."); | |
230 | if (argc > MAX_PROBE_ARGS + 1) | |
231 | semantic_error("Too many arguments"); | |
50656eec MH |
232 | |
233 | /* Parse probe point */ | |
234 | parse_perf_probe_probepoint(argv[0], pp); | |
50656eec | 235 | if (pp->file || pp->line) |
fac13fd5 | 236 | *need_dwarf = true; |
50656eec | 237 | |
e1c01d61 | 238 | /* Copy arguments and ensure return probe has no C argument */ |
50656eec | 239 | pp->nr_args = argc - 1; |
e1c01d61 MH |
240 | pp->args = zalloc(sizeof(char *) * pp->nr_args); |
241 | for (i = 0; i < pp->nr_args; i++) { | |
242 | pp->args[i] = strdup(argv[i + 1]); | |
243 | if (!pp->args[i]) | |
244 | die("Failed to copy argument."); | |
50656eec MH |
245 | if (is_c_varname(pp->args[i])) { |
246 | if (pp->retprobe) | |
247 | semantic_error("You can't specify local" | |
248 | " variable for kretprobe"); | |
fac13fd5 | 249 | *need_dwarf = true; |
50656eec | 250 | } |
e1c01d61 | 251 | } |
50656eec | 252 | |
e1c01d61 | 253 | argv_free(argv); |
50656eec MH |
254 | } |
255 | ||
4de189fe | 256 | /* Parse kprobe_events event into struct probe_point */ |
af663d75 | 257 | void parse_trace_kprobe_event(const char *str, struct probe_point *pp) |
4de189fe MH |
258 | { |
259 | char pr; | |
260 | char *p; | |
261 | int ret, i, argc; | |
262 | char **argv; | |
263 | ||
264 | pr_debug("Parsing kprobe_events: %s\n", str); | |
265 | argv = argv_split(str, &argc); | |
266 | if (!argv) | |
267 | die("argv_split failed."); | |
268 | if (argc < 2) | |
269 | semantic_error("Too less arguments."); | |
270 | ||
271 | /* Scan event and group name. */ | |
93aaa45a | 272 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
af663d75 MH |
273 | &pr, (float *)(void *)&pp->group, |
274 | (float *)(void *)&pp->event); | |
4de189fe MH |
275 | if (ret != 3) |
276 | semantic_error("Failed to parse event name: %s", argv[0]); | |
af663d75 | 277 | pr_debug("Group:%s Event:%s probe:%c\n", pp->group, pp->event, pr); |
4de189fe MH |
278 | |
279 | pp->retprobe = (pr == 'r'); | |
280 | ||
281 | /* Scan function name and offset */ | |
af663d75 MH |
282 | ret = sscanf(argv[1], "%a[^+]+%d", (float *)(void *)&pp->function, |
283 | &pp->offset); | |
4de189fe MH |
284 | if (ret == 1) |
285 | pp->offset = 0; | |
286 | ||
287 | /* kprobe_events doesn't have this information */ | |
288 | pp->line = 0; | |
289 | pp->file = NULL; | |
290 | ||
291 | pp->nr_args = argc - 2; | |
292 | pp->args = zalloc(sizeof(char *) * pp->nr_args); | |
293 | for (i = 0; i < pp->nr_args; i++) { | |
294 | p = strchr(argv[i + 2], '='); | |
295 | if (p) /* We don't need which register is assigned. */ | |
296 | *p = '\0'; | |
297 | pp->args[i] = strdup(argv[i + 2]); | |
298 | if (!pp->args[i]) | |
299 | die("Failed to copy argument."); | |
300 | } | |
301 | ||
4de189fe MH |
302 | argv_free(argv); |
303 | } | |
304 | ||
7ef17aaf MH |
305 | /* Synthesize only probe point (not argument) */ |
306 | int synthesize_perf_probe_point(struct probe_point *pp) | |
4de189fe MH |
307 | { |
308 | char *buf; | |
309 | char offs[64] = "", line[64] = ""; | |
7ef17aaf | 310 | int ret; |
4de189fe MH |
311 | |
312 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
313 | if (!buf) | |
314 | die("Failed to allocate memory by zalloc."); | |
315 | if (pp->offset) { | |
316 | ret = e_snprintf(offs, 64, "+%d", pp->offset); | |
317 | if (ret <= 0) | |
318 | goto error; | |
319 | } | |
320 | if (pp->line) { | |
321 | ret = e_snprintf(line, 64, ":%d", pp->line); | |
322 | if (ret <= 0) | |
323 | goto error; | |
324 | } | |
325 | ||
326 | if (pp->function) | |
327 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s", pp->function, | |
328 | offs, pp->retprobe ? "%return" : "", line); | |
329 | else | |
84988450 | 330 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line); |
7ef17aaf MH |
331 | if (ret <= 0) { |
332 | error: | |
333 | free(pp->probes[0]); | |
334 | pp->probes[0] = NULL; | |
335 | } | |
336 | return ret; | |
337 | } | |
338 | ||
339 | int synthesize_perf_probe_event(struct probe_point *pp) | |
340 | { | |
341 | char *buf; | |
342 | int i, len, ret; | |
343 | ||
344 | len = synthesize_perf_probe_point(pp); | |
345 | if (len < 0) | |
346 | return 0; | |
4de189fe | 347 | |
7ef17aaf | 348 | buf = pp->probes[0]; |
4de189fe MH |
349 | for (i = 0; i < pp->nr_args; i++) { |
350 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", | |
351 | pp->args[i]); | |
352 | if (ret <= 0) | |
353 | goto error; | |
354 | len += ret; | |
355 | } | |
356 | pp->found = 1; | |
357 | ||
358 | return pp->found; | |
359 | error: | |
360 | free(pp->probes[0]); | |
7ef17aaf | 361 | pp->probes[0] = NULL; |
4de189fe MH |
362 | |
363 | return ret; | |
364 | } | |
365 | ||
50656eec MH |
366 | int synthesize_trace_kprobe_event(struct probe_point *pp) |
367 | { | |
368 | char *buf; | |
369 | int i, len, ret; | |
370 | ||
371 | pp->probes[0] = buf = zalloc(MAX_CMDLEN); | |
372 | if (!buf) | |
373 | die("Failed to allocate memory by zalloc."); | |
4de189fe MH |
374 | ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset); |
375 | if (ret <= 0) | |
50656eec MH |
376 | goto error; |
377 | len = ret; | |
378 | ||
379 | for (i = 0; i < pp->nr_args; i++) { | |
4de189fe MH |
380 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
381 | pp->args[i]); | |
382 | if (ret <= 0) | |
50656eec MH |
383 | goto error; |
384 | len += ret; | |
385 | } | |
386 | pp->found = 1; | |
387 | ||
388 | return pp->found; | |
389 | error: | |
390 | free(pp->probes[0]); | |
7ef17aaf | 391 | pp->probes[0] = NULL; |
50656eec MH |
392 | |
393 | return ret; | |
394 | } | |
395 | ||
4de189fe MH |
396 | static int open_kprobe_events(int flags, int mode) |
397 | { | |
398 | char buf[PATH_MAX]; | |
399 | int ret; | |
400 | ||
401 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
402 | if (ret < 0) | |
403 | die("Failed to make kprobe_events path."); | |
404 | ||
405 | ret = open(buf, flags, mode); | |
406 | if (ret < 0) { | |
407 | if (errno == ENOENT) | |
408 | die("kprobe_events file does not exist -" | |
63bbd5e2 | 409 | " please rebuild with CONFIG_KPROBE_EVENT."); |
4de189fe MH |
410 | else |
411 | die("Could not open kprobe_events file: %s", | |
412 | strerror(errno)); | |
413 | } | |
414 | return ret; | |
415 | } | |
416 | ||
417 | /* Get raw string list of current kprobe_events */ | |
418 | static struct strlist *get_trace_kprobe_event_rawlist(int fd) | |
419 | { | |
420 | int ret, idx; | |
421 | FILE *fp; | |
422 | char buf[MAX_CMDLEN]; | |
423 | char *p; | |
424 | struct strlist *sl; | |
425 | ||
426 | sl = strlist__new(true, NULL); | |
427 | ||
428 | fp = fdopen(dup(fd), "r"); | |
429 | while (!feof(fp)) { | |
430 | p = fgets(buf, MAX_CMDLEN, fp); | |
431 | if (!p) | |
432 | break; | |
433 | ||
434 | idx = strlen(p) - 1; | |
435 | if (p[idx] == '\n') | |
436 | p[idx] = '\0'; | |
437 | ret = strlist__add(sl, buf); | |
438 | if (ret < 0) | |
439 | die("strlist__add failed: %s", strerror(-ret)); | |
440 | } | |
441 | fclose(fp); | |
442 | ||
443 | return sl; | |
444 | } | |
445 | ||
446 | /* Free and zero clear probe_point */ | |
447 | static void clear_probe_point(struct probe_point *pp) | |
448 | { | |
449 | int i; | |
450 | ||
af663d75 MH |
451 | if (pp->event) |
452 | free(pp->event); | |
453 | if (pp->group) | |
454 | free(pp->group); | |
4de189fe MH |
455 | if (pp->function) |
456 | free(pp->function); | |
457 | if (pp->file) | |
458 | free(pp->file); | |
459 | for (i = 0; i < pp->nr_args; i++) | |
460 | free(pp->args[i]); | |
461 | if (pp->args) | |
462 | free(pp->args); | |
463 | for (i = 0; i < pp->found; i++) | |
464 | free(pp->probes[i]); | |
5660ce34 | 465 | memset(pp, 0, sizeof(*pp)); |
4de189fe MH |
466 | } |
467 | ||
278498d4 | 468 | /* Show an event */ |
af663d75 MH |
469 | static void show_perf_probe_event(const char *event, const char *place, |
470 | struct probe_point *pp) | |
278498d4 | 471 | { |
7e990a51 | 472 | int i, ret; |
278498d4 MH |
473 | char buf[128]; |
474 | ||
af663d75 | 475 | ret = e_snprintf(buf, 128, "%s:%s", pp->group, event); |
7e990a51 MH |
476 | if (ret < 0) |
477 | die("Failed to copy event: %s", strerror(-ret)); | |
278498d4 MH |
478 | printf(" %-40s (on %s", buf, place); |
479 | ||
480 | if (pp->nr_args > 0) { | |
481 | printf(" with"); | |
482 | for (i = 0; i < pp->nr_args; i++) | |
483 | printf(" %s", pp->args[i]); | |
484 | } | |
485 | printf(")\n"); | |
486 | } | |
487 | ||
4de189fe MH |
488 | /* List up current perf-probe events */ |
489 | void show_perf_probe_events(void) | |
490 | { | |
7ef17aaf | 491 | int fd; |
4de189fe MH |
492 | struct probe_point pp; |
493 | struct strlist *rawlist; | |
494 | struct str_node *ent; | |
495 | ||
72041334 MH |
496 | setup_pager(); |
497 | ||
4de189fe MH |
498 | fd = open_kprobe_events(O_RDONLY, 0); |
499 | rawlist = get_trace_kprobe_event_rawlist(fd); | |
500 | close(fd); | |
501 | ||
adf365f4 | 502 | strlist__for_each(ent, rawlist) { |
af663d75 | 503 | parse_trace_kprobe_event(ent->s, &pp); |
278498d4 | 504 | /* Synthesize only event probe point */ |
7ef17aaf | 505 | synthesize_perf_probe_point(&pp); |
278498d4 | 506 | /* Show an event */ |
af663d75 | 507 | show_perf_probe_event(pp.event, pp.probes[0], &pp); |
4de189fe MH |
508 | clear_probe_point(&pp); |
509 | } | |
510 | ||
511 | strlist__delete(rawlist); | |
512 | } | |
513 | ||
b498ce1f | 514 | /* Get current perf-probe event names */ |
fa28244d | 515 | static struct strlist *get_perf_event_names(int fd, bool include_group) |
b498ce1f | 516 | { |
fa28244d | 517 | char buf[128]; |
b498ce1f MH |
518 | struct strlist *sl, *rawlist; |
519 | struct str_node *ent; | |
af663d75 | 520 | struct probe_point pp; |
b498ce1f | 521 | |
af663d75 | 522 | memset(&pp, 0, sizeof(pp)); |
b498ce1f MH |
523 | rawlist = get_trace_kprobe_event_rawlist(fd); |
524 | ||
e1d2017b | 525 | sl = strlist__new(true, NULL); |
adf365f4 | 526 | strlist__for_each(ent, rawlist) { |
af663d75 | 527 | parse_trace_kprobe_event(ent->s, &pp); |
fa28244d | 528 | if (include_group) { |
af663d75 MH |
529 | if (e_snprintf(buf, 128, "%s:%s", pp.group, |
530 | pp.event) < 0) | |
fa28244d MH |
531 | die("Failed to copy group:event name."); |
532 | strlist__add(sl, buf); | |
533 | } else | |
af663d75 MH |
534 | strlist__add(sl, pp.event); |
535 | clear_probe_point(&pp); | |
b498ce1f MH |
536 | } |
537 | ||
538 | strlist__delete(rawlist); | |
539 | ||
540 | return sl; | |
541 | } | |
542 | ||
a9b495b0 | 543 | static void write_trace_kprobe_event(int fd, const char *buf) |
50656eec MH |
544 | { |
545 | int ret; | |
546 | ||
fa28244d | 547 | pr_debug("Writing event: %s\n", buf); |
50656eec MH |
548 | ret = write(fd, buf, strlen(buf)); |
549 | if (ret <= 0) | |
fa28244d | 550 | die("Failed to write event: %s", strerror(errno)); |
50656eec MH |
551 | } |
552 | ||
b498ce1f | 553 | static void get_new_event_name(char *buf, size_t len, const char *base, |
d761b08b | 554 | struct strlist *namelist, bool allow_suffix) |
b498ce1f MH |
555 | { |
556 | int i, ret; | |
17f88fcd MH |
557 | |
558 | /* Try no suffix */ | |
559 | ret = e_snprintf(buf, len, "%s", base); | |
560 | if (ret < 0) | |
561 | die("snprintf() failed: %s", strerror(-ret)); | |
562 | if (!strlist__has_entry(namelist, buf)) | |
563 | return; | |
564 | ||
d761b08b MH |
565 | if (!allow_suffix) { |
566 | pr_warning("Error: event \"%s\" already exists. " | |
567 | "(Use -f to force duplicates.)\n", base); | |
568 | die("Can't add new event."); | |
569 | } | |
570 | ||
17f88fcd MH |
571 | /* Try to add suffix */ |
572 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f MH |
573 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
574 | if (ret < 0) | |
575 | die("snprintf() failed: %s", strerror(-ret)); | |
576 | if (!strlist__has_entry(namelist, buf)) | |
577 | break; | |
578 | } | |
579 | if (i == MAX_EVENT_INDEX) | |
580 | die("Too many events are on the same function."); | |
581 | } | |
582 | ||
d761b08b MH |
583 | void add_trace_kprobe_events(struct probe_point *probes, int nr_probes, |
584 | bool force_add) | |
50656eec MH |
585 | { |
586 | int i, j, fd; | |
587 | struct probe_point *pp; | |
588 | char buf[MAX_CMDLEN]; | |
b498ce1f MH |
589 | char event[64]; |
590 | struct strlist *namelist; | |
d761b08b | 591 | bool allow_suffix; |
50656eec | 592 | |
b498ce1f MH |
593 | fd = open_kprobe_events(O_RDWR, O_APPEND); |
594 | /* Get current event names */ | |
fa28244d | 595 | namelist = get_perf_event_names(fd, false); |
50656eec MH |
596 | |
597 | for (j = 0; j < nr_probes; j++) { | |
598 | pp = probes + j; | |
af663d75 MH |
599 | if (!pp->event) |
600 | pp->event = strdup(pp->function); | |
601 | if (!pp->group) | |
602 | pp->group = strdup(PERFPROBE_GROUP); | |
603 | DIE_IF(!pp->event || !pp->group); | |
d761b08b MH |
604 | /* If force_add is true, suffix search is allowed */ |
605 | allow_suffix = force_add; | |
b498ce1f MH |
606 | for (i = 0; i < pp->found; i++) { |
607 | /* Get an unused new event name */ | |
d761b08b MH |
608 | get_new_event_name(event, 64, pp->event, namelist, |
609 | allow_suffix); | |
b498ce1f MH |
610 | snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n", |
611 | pp->retprobe ? 'r' : 'p', | |
af663d75 | 612 | pp->group, event, |
b498ce1f | 613 | pp->probes[i]); |
50656eec | 614 | write_trace_kprobe_event(fd, buf); |
a9b495b0 MH |
615 | printf("Added new event:\n"); |
616 | /* Get the first parameter (probe-point) */ | |
617 | sscanf(pp->probes[i], "%s", buf); | |
af663d75 | 618 | show_perf_probe_event(event, buf, pp); |
b498ce1f MH |
619 | /* Add added event name to namelist */ |
620 | strlist__add(namelist, event); | |
d761b08b MH |
621 | /* |
622 | * Probes after the first probe which comes from same | |
623 | * user input are always allowed to add suffix, because | |
624 | * there might be several addresses corresponding to | |
625 | * one code line. | |
626 | */ | |
627 | allow_suffix = true; | |
b498ce1f | 628 | } |
50656eec | 629 | } |
a9b495b0 MH |
630 | /* Show how to use the event. */ |
631 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
632 | printf("\tperf record -e %s:%s -a sleep 1\n\n", PERFPROBE_GROUP, event); | |
633 | ||
e1d2017b | 634 | strlist__delete(namelist); |
50656eec MH |
635 | close(fd); |
636 | } | |
fa28244d | 637 | |
bbbb521b MH |
638 | static void __del_trace_kprobe_event(int fd, struct str_node *ent) |
639 | { | |
640 | char *p; | |
641 | char buf[128]; | |
642 | ||
643 | /* Convert from perf-probe event to trace-kprobe event */ | |
644 | if (e_snprintf(buf, 128, "-:%s", ent->s) < 0) | |
645 | die("Failed to copy event."); | |
646 | p = strchr(buf + 2, ':'); | |
647 | if (!p) | |
648 | die("Internal error: %s should have ':' but not.", ent->s); | |
649 | *p = '/'; | |
650 | ||
651 | write_trace_kprobe_event(fd, buf); | |
652 | printf("Remove event: %s\n", ent->s); | |
653 | } | |
654 | ||
fa28244d MH |
655 | static void del_trace_kprobe_event(int fd, const char *group, |
656 | const char *event, struct strlist *namelist) | |
657 | { | |
658 | char buf[128]; | |
bbbb521b MH |
659 | struct str_node *ent, *n; |
660 | int found = 0; | |
fa28244d MH |
661 | |
662 | if (e_snprintf(buf, 128, "%s:%s", group, event) < 0) | |
663 | die("Failed to copy event."); | |
fa28244d | 664 | |
bbbb521b MH |
665 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
666 | strlist__for_each_safe(ent, n, namelist) | |
667 | if (strglobmatch(ent->s, buf)) { | |
668 | found++; | |
669 | __del_trace_kprobe_event(fd, ent); | |
670 | strlist__remove(namelist, ent); | |
671 | } | |
672 | } else { | |
673 | ent = strlist__find(namelist, buf); | |
674 | if (ent) { | |
675 | found++; | |
676 | __del_trace_kprobe_event(fd, ent); | |
677 | strlist__remove(namelist, ent); | |
678 | } | |
679 | } | |
680 | if (found == 0) | |
681 | pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf); | |
fa28244d MH |
682 | } |
683 | ||
684 | void del_trace_kprobe_events(struct strlist *dellist) | |
685 | { | |
686 | int fd; | |
fa28244d MH |
687 | const char *group, *event; |
688 | char *p, *str; | |
689 | struct str_node *ent; | |
690 | struct strlist *namelist; | |
691 | ||
692 | fd = open_kprobe_events(O_RDWR, O_APPEND); | |
693 | /* Get current event names */ | |
694 | namelist = get_perf_event_names(fd, true); | |
695 | ||
adf365f4 | 696 | strlist__for_each(ent, dellist) { |
fa28244d MH |
697 | str = strdup(ent->s); |
698 | if (!str) | |
699 | die("Failed to copy event."); | |
bbbb521b | 700 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
701 | p = strchr(str, ':'); |
702 | if (p) { | |
703 | group = str; | |
704 | *p = '\0'; | |
705 | event = p + 1; | |
706 | } else { | |
bbbb521b | 707 | group = "*"; |
fa28244d MH |
708 | event = str; |
709 | } | |
bbbb521b | 710 | pr_debug("Group: %s, Event: %s\n", group, event); |
fa28244d MH |
711 | del_trace_kprobe_event(fd, group, event, namelist); |
712 | free(str); | |
713 | } | |
714 | strlist__delete(namelist); | |
715 | close(fd); | |
716 | } | |
717 | ||
631c9def | 718 | #define LINEBUF_SIZE 256 |
5c8d1cbb | 719 | #define NR_ADDITIONAL_LINES 2 |
631c9def MH |
720 | |
721 | static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num) | |
722 | { | |
723 | char buf[LINEBUF_SIZE]; | |
724 | const char *color = PERF_COLOR_BLUE; | |
725 | ||
726 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
727 | goto error; | |
728 | if (!skip) { | |
729 | if (show_num) | |
730 | fprintf(stdout, "%7u %s", l, buf); | |
731 | else | |
732 | color_fprintf(stdout, color, " %s", buf); | |
733 | } | |
734 | ||
735 | while (strlen(buf) == LINEBUF_SIZE - 1 && | |
736 | buf[LINEBUF_SIZE - 2] != '\n') { | |
737 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
738 | goto error; | |
739 | if (!skip) { | |
740 | if (show_num) | |
741 | fprintf(stdout, "%s", buf); | |
742 | else | |
743 | color_fprintf(stdout, color, "%s", buf); | |
744 | } | |
745 | } | |
746 | return; | |
747 | error: | |
748 | if (feof(fp)) | |
749 | die("Source file is shorter than expected."); | |
750 | else | |
751 | die("File read error: %s", strerror(errno)); | |
752 | } | |
753 | ||
754 | void show_line_range(struct line_range *lr) | |
755 | { | |
756 | unsigned int l = 1; | |
757 | struct line_node *ln; | |
758 | FILE *fp; | |
759 | ||
760 | setup_pager(); | |
761 | ||
762 | if (lr->function) | |
763 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
764 | lr->start - lr->offset); | |
765 | else | |
766 | fprintf(stdout, "<%s:%d>\n", lr->file, lr->start); | |
767 | ||
768 | fp = fopen(lr->path, "r"); | |
769 | if (fp == NULL) | |
770 | die("Failed to open %s: %s", lr->path, strerror(errno)); | |
771 | /* Skip to starting line number */ | |
772 | while (l < lr->start) | |
773 | show_one_line(fp, l++, true, false); | |
774 | ||
775 | list_for_each_entry(ln, &lr->line_list, list) { | |
776 | while (ln->line > l) | |
777 | show_one_line(fp, (l++) - lr->offset, false, false); | |
778 | show_one_line(fp, (l++) - lr->offset, false, true); | |
779 | } | |
5c8d1cbb MH |
780 | |
781 | if (lr->end == INT_MAX) | |
782 | lr->end = l + NR_ADDITIONAL_LINES; | |
783 | while (l < lr->end && !feof(fp)) | |
784 | show_one_line(fp, (l++) - lr->offset, false, false); | |
785 | ||
631c9def MH |
786 | fclose(fp); |
787 | } |