Commit | Line | Data |
---|---|---|
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 | |
31facc5f | 36 | #include "util.h" |
50656eec | 37 | #include "event.h" |
e1c01d61 | 38 | #include "string.h" |
4de189fe | 39 | #include "strlist.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" | |
4b4da7f7 MH |
45 | #include "trace-event.h" /* For __unused */ |
46 | #include "parse-events.h" /* For debugfs_path */ | |
50656eec | 47 | #include "probe-event.h" |
4235b045 | 48 | #include "probe-finder.h" |
50656eec MH |
49 | |
50 | #define MAX_CMDLEN 256 | |
51 | #define MAX_PROBE_ARGS 128 | |
52 | #define PERFPROBE_GROUP "probe" | |
53 | ||
f4d7da49 MH |
54 | bool probe_event_dry_run; /* Dry run flag */ |
55 | ||
146a1439 | 56 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 57 | |
4de189fe | 58 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
59 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
60 | __attribute__((format(printf, 3, 4))); | |
61 | ||
4de189fe MH |
62 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
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 | ||
4b4da7f7 | 74 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp); |
e0faa8d3 MH |
75 | static struct map_groups kmap_groups; |
76 | static struct map *kmaps[MAP__NR_TYPES]; | |
77 | ||
4b4da7f7 | 78 | /* Initialize symbol maps and path of vmlinux */ |
146a1439 | 79 | static int init_vmlinux(void) |
e0faa8d3 | 80 | { |
146a1439 MH |
81 | int ret; |
82 | ||
e0faa8d3 MH |
83 | symbol_conf.sort_by_name = true; |
84 | if (symbol_conf.vmlinux_name == NULL) | |
85 | symbol_conf.try_vmlinux_path = true; | |
86 | else | |
87 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
146a1439 MH |
88 | ret = symbol__init(); |
89 | if (ret < 0) { | |
90 | pr_debug("Failed to init symbol map.\n"); | |
91 | goto out; | |
92 | } | |
e0faa8d3 MH |
93 | |
94 | map_groups__init(&kmap_groups); | |
146a1439 MH |
95 | ret = map_groups__create_kernel_maps(&kmap_groups, kmaps); |
96 | if (ret < 0) | |
97 | pr_debug("Failed to create kernel maps.\n"); | |
98 | ||
99 | out: | |
100 | if (ret < 0) | |
101 | pr_warning("Failed to init vmlinux path.\n"); | |
102 | return ret; | |
e0faa8d3 MH |
103 | } |
104 | ||
4b4da7f7 | 105 | #ifdef DWARF_SUPPORT |
e0faa8d3 MH |
106 | static int open_vmlinux(void) |
107 | { | |
108 | if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) { | |
109 | pr_debug("Failed to load kernel map.\n"); | |
110 | return -EINVAL; | |
111 | } | |
112 | pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name); | |
113 | return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY); | |
114 | } | |
4b4da7f7 | 115 | |
146a1439 MH |
116 | /* Convert trace point to probe point with debuginfo */ |
117 | static int convert_to_perf_probe_point(struct kprobe_trace_point *tp, | |
118 | struct perf_probe_point *pp) | |
4b4da7f7 MH |
119 | { |
120 | struct symbol *sym; | |
146a1439 | 121 | int fd, ret = -ENOENT; |
4b4da7f7 MH |
122 | |
123 | sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION], | |
124 | tp->symbol, NULL); | |
125 | if (sym) { | |
126 | fd = open_vmlinux(); | |
146a1439 MH |
127 | if (fd >= 0) { |
128 | ret = find_perf_probe_point(fd, | |
129 | sym->start + tp->offset, pp); | |
130 | close(fd); | |
131 | } | |
4b4da7f7 MH |
132 | } |
133 | if (ret <= 0) { | |
146a1439 MH |
134 | pr_debug("Failed to find corresponding probes from " |
135 | "debuginfo. Use kprobe event information.\n"); | |
4b4da7f7 MH |
136 | pp->function = xstrdup(tp->symbol); |
137 | pp->offset = tp->offset; | |
138 | } | |
139 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
140 | |
141 | return 0; | |
4b4da7f7 MH |
142 | } |
143 | ||
144 | /* Try to find perf_probe_event with debuginfo */ | |
145 | static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, | |
146 | struct kprobe_trace_event **tevs) | |
147 | { | |
148 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
149 | int fd, ntevs; | |
150 | ||
151 | fd = open_vmlinux(); | |
152 | if (fd < 0) { | |
146a1439 MH |
153 | if (need_dwarf) { |
154 | pr_warning("Failed to open debuginfo file.\n"); | |
155 | return fd; | |
156 | } | |
4b4da7f7 MH |
157 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* Searching trace events corresponding to probe event */ | |
162 | ntevs = find_kprobe_trace_events(fd, pev, tevs); | |
163 | close(fd); | |
164 | ||
146a1439 MH |
165 | if (ntevs > 0) { /* Succeeded to find trace events */ |
166 | pr_debug("find %d kprobe_trace_events.\n", ntevs); | |
4b4da7f7 | 167 | return ntevs; |
146a1439 | 168 | } |
4b4da7f7 | 169 | |
146a1439 MH |
170 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
171 | pr_warning("Probe point '%s' not found.\n", | |
172 | synthesize_perf_probe_point(&pev->point)); | |
173 | return -ENOENT; | |
174 | } | |
175 | /* Error path : ntevs < 0 */ | |
4b4da7f7 | 176 | if (need_dwarf) { |
b55a87ad | 177 | if (ntevs == -EBADF) |
4b4da7f7 MH |
178 | pr_warning("No dwarf info found in the vmlinux - " |
179 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
146a1439 | 180 | return ntevs; |
4b4da7f7 MH |
181 | } |
182 | pr_debug("An error occurred in debuginfo analysis." | |
183 | " Try to use symbols.\n"); | |
184 | return 0; | |
4b4da7f7 MH |
185 | } |
186 | ||
187 | #define LINEBUF_SIZE 256 | |
188 | #define NR_ADDITIONAL_LINES 2 | |
189 | ||
146a1439 | 190 | static int show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num) |
4b4da7f7 MH |
191 | { |
192 | char buf[LINEBUF_SIZE]; | |
193 | const char *color = PERF_COLOR_BLUE; | |
194 | ||
195 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
196 | goto error; | |
197 | if (!skip) { | |
198 | if (show_num) | |
199 | fprintf(stdout, "%7u %s", l, buf); | |
200 | else | |
201 | color_fprintf(stdout, color, " %s", buf); | |
202 | } | |
203 | ||
204 | while (strlen(buf) == LINEBUF_SIZE - 1 && | |
205 | buf[LINEBUF_SIZE - 2] != '\n') { | |
206 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
207 | goto error; | |
208 | if (!skip) { | |
209 | if (show_num) | |
210 | fprintf(stdout, "%s", buf); | |
211 | else | |
212 | color_fprintf(stdout, color, "%s", buf); | |
213 | } | |
214 | } | |
146a1439 MH |
215 | |
216 | return 0; | |
4b4da7f7 MH |
217 | error: |
218 | if (feof(fp)) | |
146a1439 | 219 | pr_warning("Source file is shorter than expected.\n"); |
4b4da7f7 | 220 | else |
146a1439 MH |
221 | pr_warning("File read error: %s\n", strerror(errno)); |
222 | ||
223 | return -1; | |
4b4da7f7 MH |
224 | } |
225 | ||
226 | /* | |
227 | * Show line-range always requires debuginfo to find source file and | |
228 | * line number. | |
229 | */ | |
146a1439 | 230 | int show_line_range(struct line_range *lr) |
4b4da7f7 MH |
231 | { |
232 | unsigned int l = 1; | |
233 | struct line_node *ln; | |
234 | FILE *fp; | |
235 | int fd, ret; | |
236 | ||
237 | /* Search a line range */ | |
146a1439 MH |
238 | ret = init_vmlinux(); |
239 | if (ret < 0) | |
240 | return ret; | |
241 | ||
4b4da7f7 | 242 | fd = open_vmlinux(); |
146a1439 MH |
243 | if (fd < 0) { |
244 | pr_warning("Failed to open debuginfo file.\n"); | |
245 | return fd; | |
246 | } | |
247 | ||
4b4da7f7 | 248 | ret = find_line_range(fd, lr); |
4b4da7f7 | 249 | close(fd); |
146a1439 MH |
250 | if (ret == 0) { |
251 | pr_warning("Specified source line is not found.\n"); | |
252 | return -ENOENT; | |
253 | } else if (ret < 0) { | |
254 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); | |
255 | return ret; | |
256 | } | |
4b4da7f7 MH |
257 | |
258 | setup_pager(); | |
259 | ||
260 | if (lr->function) | |
261 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
262 | lr->start - lr->offset); | |
263 | else | |
264 | fprintf(stdout, "<%s:%d>\n", lr->file, lr->start); | |
265 | ||
266 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
267 | if (fp == NULL) { |
268 | pr_warning("Failed to open %s: %s\n", lr->path, | |
269 | strerror(errno)); | |
270 | return -errno; | |
271 | } | |
4b4da7f7 | 272 | /* Skip to starting line number */ |
146a1439 MH |
273 | while (l < lr->start && ret >= 0) |
274 | ret = show_one_line(fp, l++, true, false); | |
275 | if (ret < 0) | |
276 | goto end; | |
4b4da7f7 MH |
277 | |
278 | list_for_each_entry(ln, &lr->line_list, list) { | |
146a1439 MH |
279 | while (ln->line > l && ret >= 0) |
280 | ret = show_one_line(fp, (l++) - lr->offset, | |
281 | false, false); | |
282 | if (ret >= 0) | |
283 | ret = show_one_line(fp, (l++) - lr->offset, | |
284 | false, true); | |
285 | if (ret < 0) | |
286 | goto end; | |
4b4da7f7 MH |
287 | } |
288 | ||
289 | if (lr->end == INT_MAX) | |
290 | lr->end = l + NR_ADDITIONAL_LINES; | |
146a1439 MH |
291 | while (l < lr->end && !feof(fp) && ret >= 0) |
292 | ret = show_one_line(fp, (l++) - lr->offset, false, false); | |
293 | end: | |
4b4da7f7 | 294 | fclose(fp); |
146a1439 | 295 | return ret; |
4b4da7f7 MH |
296 | } |
297 | ||
298 | #else /* !DWARF_SUPPORT */ | |
299 | ||
146a1439 | 300 | static int convert_to_perf_probe_point(struct kprobe_trace_point *tp, |
4b4da7f7 MH |
301 | struct perf_probe_point *pp) |
302 | { | |
303 | pp->function = xstrdup(tp->symbol); | |
304 | pp->offset = tp->offset; | |
305 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
306 | |
307 | return 0; | |
4b4da7f7 MH |
308 | } |
309 | ||
310 | static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, | |
311 | struct kprobe_trace_event **tevs __unused) | |
312 | { | |
146a1439 MH |
313 | if (perf_probe_event_need_dwarf(pev)) { |
314 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
315 | return -ENOSYS; | |
316 | } | |
4b4da7f7 MH |
317 | return 0; |
318 | } | |
319 | ||
146a1439 | 320 | int show_line_range(struct line_range *lr __unused) |
4b4da7f7 | 321 | { |
146a1439 MH |
322 | pr_warning("Debuginfo-analysis is not supported.\n"); |
323 | return -ENOSYS; | |
4b4da7f7 MH |
324 | } |
325 | ||
e0faa8d3 MH |
326 | #endif |
327 | ||
146a1439 | 328 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def MH |
329 | { |
330 | const char *ptr; | |
331 | char *tmp; | |
332 | /* | |
333 | * <Syntax> | |
334 | * SRC:SLN[+NUM|-ELN] | |
335 | * FUNC[:SLN[+NUM|-ELN]] | |
336 | */ | |
337 | ptr = strchr(arg, ':'); | |
338 | if (ptr) { | |
339 | lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0); | |
340 | if (*tmp == '+') | |
341 | lr->end = lr->start + (unsigned int)strtoul(tmp + 1, | |
342 | &tmp, 0); | |
343 | else if (*tmp == '-') | |
344 | lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0); | |
345 | else | |
346 | lr->end = 0; | |
347 | pr_debug("Line range is %u to %u\n", lr->start, lr->end); | |
146a1439 | 348 | if (lr->end && lr->start > lr->end) { |
631c9def | 349 | semantic_error("Start line must be smaller" |
146a1439 MH |
350 | " than end line.\n"); |
351 | return -EINVAL; | |
352 | } | |
353 | if (*tmp != '\0') { | |
354 | semantic_error("Tailing with invalid character '%d'.\n", | |
631c9def | 355 | *tmp); |
146a1439 MH |
356 | return -EINVAL; |
357 | } | |
31facc5f | 358 | tmp = xstrndup(arg, (ptr - arg)); |
631c9def | 359 | } else |
31facc5f | 360 | tmp = xstrdup(arg); |
631c9def MH |
361 | |
362 | if (strchr(tmp, '.')) | |
363 | lr->file = tmp; | |
364 | else | |
365 | lr->function = tmp; | |
146a1439 MH |
366 | |
367 | return 0; | |
631c9def MH |
368 | } |
369 | ||
b7702a21 MH |
370 | /* Check the name is good for event/group */ |
371 | static bool check_event_name(const char *name) | |
372 | { | |
373 | if (!isalpha(*name) && *name != '_') | |
374 | return false; | |
375 | while (*++name != '\0') { | |
376 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
377 | return false; | |
378 | } | |
379 | return true; | |
380 | } | |
381 | ||
50656eec | 382 | /* Parse probepoint definition. */ |
146a1439 | 383 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 384 | { |
4235b045 | 385 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
386 | char *ptr, *tmp; |
387 | char c, nc = 0; | |
388 | /* | |
389 | * <Syntax> | |
2a9c8c36 MH |
390 | * perf probe [EVENT=]SRC[:LN|;PTN] |
391 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
392 | * |
393 | * TODO:Group name support | |
50656eec MH |
394 | */ |
395 | ||
2a9c8c36 MH |
396 | ptr = strpbrk(arg, ";=@+%"); |
397 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
398 | *ptr = '\0'; |
399 | tmp = ptr + 1; | |
146a1439 MH |
400 | if (strchr(arg, ':')) { |
401 | semantic_error("Group name is not supported yet.\n"); | |
402 | return -ENOTSUP; | |
403 | } | |
404 | if (!check_event_name(arg)) { | |
b7702a21 | 405 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
406 | "follow C symbol-naming rule.\n", arg); |
407 | return -EINVAL; | |
408 | } | |
4235b045 MH |
409 | pev->event = xstrdup(arg); |
410 | pev->group = NULL; | |
af663d75 MH |
411 | arg = tmp; |
412 | } | |
413 | ||
2a9c8c36 | 414 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
415 | if (ptr) { |
416 | nc = *ptr; | |
417 | *ptr++ = '\0'; | |
418 | } | |
419 | ||
420 | /* Check arg is function or file and copy it */ | |
421 | if (strchr(arg, '.')) /* File */ | |
31facc5f | 422 | pp->file = xstrdup(arg); |
50656eec | 423 | else /* Function */ |
31facc5f | 424 | pp->function = xstrdup(arg); |
50656eec MH |
425 | |
426 | /* Parse other options */ | |
427 | while (ptr) { | |
428 | arg = ptr; | |
429 | c = nc; | |
2a9c8c36 | 430 | if (c == ';') { /* Lazy pattern must be the last part */ |
31facc5f | 431 | pp->lazy_line = xstrdup(arg); |
2a9c8c36 MH |
432 | break; |
433 | } | |
434 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
435 | if (ptr) { |
436 | nc = *ptr; | |
437 | *ptr++ = '\0'; | |
438 | } | |
439 | switch (c) { | |
440 | case ':': /* Line number */ | |
441 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 442 | if (*tmp != '\0') { |
2a9c8c36 | 443 | semantic_error("There is non-digit char" |
146a1439 MH |
444 | " in line number.\n"); |
445 | return -EINVAL; | |
446 | } | |
50656eec MH |
447 | break; |
448 | case '+': /* Byte offset from a symbol */ | |
449 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 450 | if (*tmp != '\0') { |
2a9c8c36 | 451 | semantic_error("There is non-digit character" |
146a1439 MH |
452 | " in offset.\n"); |
453 | return -EINVAL; | |
454 | } | |
50656eec MH |
455 | break; |
456 | case '@': /* File name */ | |
146a1439 MH |
457 | if (pp->file) { |
458 | semantic_error("SRC@SRC is not allowed.\n"); | |
459 | return -EINVAL; | |
460 | } | |
31facc5f | 461 | pp->file = xstrdup(arg); |
50656eec MH |
462 | break; |
463 | case '%': /* Probe places */ | |
464 | if (strcmp(arg, "return") == 0) { | |
465 | pp->retprobe = 1; | |
146a1439 MH |
466 | } else { /* Others not supported yet */ |
467 | semantic_error("%%%s is not supported.\n", arg); | |
468 | return -ENOTSUP; | |
469 | } | |
50656eec | 470 | break; |
146a1439 MH |
471 | default: /* Buggy case */ |
472 | pr_err("This program has a bug at %s:%d.\n", | |
473 | __FILE__, __LINE__); | |
474 | return -ENOTSUP; | |
50656eec MH |
475 | break; |
476 | } | |
477 | } | |
478 | ||
479 | /* Exclusion check */ | |
146a1439 | 480 | if (pp->lazy_line && pp->line) { |
2a9c8c36 | 481 | semantic_error("Lazy pattern can't be used with line number."); |
146a1439 MH |
482 | return -EINVAL; |
483 | } | |
2a9c8c36 | 484 | |
146a1439 | 485 | if (pp->lazy_line && pp->offset) { |
2a9c8c36 | 486 | semantic_error("Lazy pattern can't be used with offset."); |
146a1439 MH |
487 | return -EINVAL; |
488 | } | |
2a9c8c36 | 489 | |
146a1439 | 490 | if (pp->line && pp->offset) { |
50656eec | 491 | semantic_error("Offset can't be used with line number."); |
146a1439 MH |
492 | return -EINVAL; |
493 | } | |
50656eec | 494 | |
146a1439 | 495 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 MH |
496 | semantic_error("File always requires line number or " |
497 | "lazy pattern."); | |
146a1439 MH |
498 | return -EINVAL; |
499 | } | |
50656eec | 500 | |
146a1439 | 501 | if (pp->offset && !pp->function) { |
50656eec | 502 | semantic_error("Offset requires an entry function."); |
146a1439 MH |
503 | return -EINVAL; |
504 | } | |
50656eec | 505 | |
146a1439 | 506 | if (pp->retprobe && !pp->function) { |
50656eec | 507 | semantic_error("Return probe requires an entry function."); |
146a1439 MH |
508 | return -EINVAL; |
509 | } | |
50656eec | 510 | |
146a1439 | 511 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 MH |
512 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
513 | "return probe."); | |
146a1439 MH |
514 | return -EINVAL; |
515 | } | |
50656eec | 516 | |
4235b045 | 517 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
518 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
519 | pp->lazy_line); | |
146a1439 | 520 | return 0; |
50656eec MH |
521 | } |
522 | ||
7df2f329 | 523 | /* Parse perf-probe event argument */ |
146a1439 | 524 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 525 | { |
48481938 | 526 | char *tmp; |
7df2f329 MH |
527 | struct perf_probe_arg_field **fieldp; |
528 | ||
529 | pr_debug("parsing arg: %s into ", str); | |
530 | ||
48481938 MH |
531 | tmp = strchr(str, '='); |
532 | if (tmp) { | |
533 | arg->name = xstrndup(str, tmp - str); | |
11a1ca35 | 534 | pr_debug("name:%s ", arg->name); |
48481938 MH |
535 | str = tmp + 1; |
536 | } | |
537 | ||
11a1ca35 MH |
538 | tmp = strchr(str, ':'); |
539 | if (tmp) { /* Type setting */ | |
540 | *tmp = '\0'; | |
541 | arg->type = xstrdup(tmp + 1); | |
542 | pr_debug("type:%s ", arg->type); | |
543 | } | |
544 | ||
7df2f329 MH |
545 | tmp = strpbrk(str, "-."); |
546 | if (!is_c_varname(str) || !tmp) { | |
547 | /* A variable, register, symbol or special value */ | |
48481938 MH |
548 | arg->var = xstrdup(str); |
549 | pr_debug("%s\n", arg->var); | |
146a1439 | 550 | return 0; |
7df2f329 MH |
551 | } |
552 | ||
553 | /* Structure fields */ | |
48481938 MH |
554 | arg->var = xstrndup(str, tmp - str); |
555 | pr_debug("%s, ", arg->var); | |
7df2f329 MH |
556 | fieldp = &arg->field; |
557 | ||
558 | do { | |
559 | *fieldp = xzalloc(sizeof(struct perf_probe_arg_field)); | |
560 | if (*tmp == '.') { | |
561 | str = tmp + 1; | |
562 | (*fieldp)->ref = false; | |
563 | } else if (tmp[1] == '>') { | |
564 | str = tmp + 2; | |
565 | (*fieldp)->ref = true; | |
146a1439 MH |
566 | } else { |
567 | semantic_error("Argument parse error: %s\n", str); | |
568 | return -EINVAL; | |
569 | } | |
7df2f329 MH |
570 | |
571 | tmp = strpbrk(str, "-."); | |
572 | if (tmp) { | |
573 | (*fieldp)->name = xstrndup(str, tmp - str); | |
574 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); | |
575 | fieldp = &(*fieldp)->next; | |
576 | } | |
577 | } while (tmp); | |
578 | (*fieldp)->name = xstrdup(str); | |
579 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); | |
df0faf4b MH |
580 | |
581 | /* If no name is specified, set the last field name */ | |
582 | if (!arg->name) | |
583 | arg->name = xstrdup((*fieldp)->name); | |
146a1439 MH |
584 | |
585 | return 0; | |
7df2f329 MH |
586 | } |
587 | ||
4235b045 | 588 | /* Parse perf-probe event command */ |
146a1439 | 589 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 590 | { |
e1c01d61 | 591 | char **argv; |
146a1439 | 592 | int argc, i, ret = 0; |
fac13fd5 | 593 | |
4235b045 | 594 | argv = argv_split(cmd, &argc); |
146a1439 MH |
595 | if (!argv) { |
596 | pr_debug("Failed to split arguments.\n"); | |
597 | return -ENOMEM; | |
598 | } | |
599 | if (argc - 1 > MAX_PROBE_ARGS) { | |
600 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
601 | ret = -ERANGE; | |
602 | goto out; | |
603 | } | |
50656eec | 604 | /* Parse probe point */ |
146a1439 MH |
605 | ret = parse_perf_probe_point(argv[0], pev); |
606 | if (ret < 0) | |
607 | goto out; | |
50656eec | 608 | |
e1c01d61 | 609 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 MH |
610 | pev->nargs = argc - 1; |
611 | pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs); | |
146a1439 MH |
612 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
613 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
614 | if (ret >= 0 && | |
615 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 616 | semantic_error("You can't specify local variable for" |
146a1439 MH |
617 | " kretprobe.\n"); |
618 | ret = -EINVAL; | |
619 | } | |
e1c01d61 | 620 | } |
146a1439 | 621 | out: |
e1c01d61 | 622 | argv_free(argv); |
146a1439 MH |
623 | |
624 | return ret; | |
50656eec MH |
625 | } |
626 | ||
4235b045 MH |
627 | /* Return true if this perf_probe_event requires debuginfo */ |
628 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
629 | { | |
630 | int i; | |
631 | ||
632 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
633 | return true; | |
634 | ||
635 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 636 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
637 | return true; |
638 | ||
639 | return false; | |
640 | } | |
641 | ||
4de189fe | 642 | /* Parse kprobe_events event into struct probe_point */ |
146a1439 | 643 | int parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev) |
4de189fe | 644 | { |
4235b045 | 645 | struct kprobe_trace_point *tp = &tev->point; |
4de189fe MH |
646 | char pr; |
647 | char *p; | |
648 | int ret, i, argc; | |
649 | char **argv; | |
650 | ||
4235b045 MH |
651 | pr_debug("Parsing kprobe_events: %s\n", cmd); |
652 | argv = argv_split(cmd, &argc); | |
146a1439 MH |
653 | if (!argv) { |
654 | pr_debug("Failed to split arguments.\n"); | |
655 | return -ENOMEM; | |
656 | } | |
657 | if (argc < 2) { | |
658 | semantic_error("Too few probe arguments.\n"); | |
659 | ret = -ERANGE; | |
660 | goto out; | |
661 | } | |
4de189fe MH |
662 | |
663 | /* Scan event and group name. */ | |
93aaa45a | 664 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
665 | &pr, (float *)(void *)&tev->group, |
666 | (float *)(void *)&tev->event); | |
146a1439 MH |
667 | if (ret != 3) { |
668 | semantic_error("Failed to parse event name: %s\n", argv[0]); | |
669 | ret = -EINVAL; | |
670 | goto out; | |
671 | } | |
4235b045 | 672 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 673 | |
4235b045 | 674 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
675 | |
676 | /* Scan function name and offset */ | |
4235b045 MH |
677 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
678 | &tp->offset); | |
4de189fe | 679 | if (ret == 1) |
4235b045 | 680 | tp->offset = 0; |
4de189fe | 681 | |
4235b045 MH |
682 | tev->nargs = argc - 2; |
683 | tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs); | |
684 | for (i = 0; i < tev->nargs; i++) { | |
4de189fe MH |
685 | p = strchr(argv[i + 2], '='); |
686 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
687 | *p++ = '\0'; |
688 | else | |
689 | p = argv[i + 2]; | |
690 | tev->args[i].name = xstrdup(argv[i + 2]); | |
691 | /* TODO: parse regs and offset */ | |
692 | tev->args[i].value = xstrdup(p); | |
4de189fe | 693 | } |
146a1439 MH |
694 | ret = 0; |
695 | out: | |
4de189fe | 696 | argv_free(argv); |
146a1439 | 697 | return ret; |
4de189fe MH |
698 | } |
699 | ||
7df2f329 MH |
700 | /* Compose only probe arg */ |
701 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
702 | { | |
703 | struct perf_probe_arg_field *field = pa->field; | |
704 | int ret; | |
705 | char *tmp = buf; | |
706 | ||
48481938 MH |
707 | if (pa->name && pa->var) |
708 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
709 | else | |
710 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
711 | if (ret <= 0) |
712 | goto error; | |
713 | tmp += ret; | |
714 | len -= ret; | |
715 | ||
716 | while (field) { | |
717 | ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".", | |
718 | field->name); | |
719 | if (ret <= 0) | |
720 | goto error; | |
721 | tmp += ret; | |
722 | len -= ret; | |
723 | field = field->next; | |
724 | } | |
11a1ca35 MH |
725 | |
726 | if (pa->type) { | |
727 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
728 | if (ret <= 0) | |
729 | goto error; | |
730 | tmp += ret; | |
731 | len -= ret; | |
732 | } | |
733 | ||
7df2f329 MH |
734 | return tmp - buf; |
735 | error: | |
146a1439 MH |
736 | pr_debug("Failed to synthesize perf probe argument: %s", |
737 | strerror(-ret)); | |
738 | return ret; | |
7df2f329 MH |
739 | } |
740 | ||
4235b045 MH |
741 | /* Compose only probe point (not argument) */ |
742 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 743 | { |
fb1587d8 MH |
744 | char *buf, *tmp; |
745 | char offs[32] = "", line[32] = "", file[32] = ""; | |
746 | int ret, len; | |
4de189fe | 747 | |
4235b045 | 748 | buf = xzalloc(MAX_CMDLEN); |
4de189fe | 749 | if (pp->offset) { |
fb1587d8 | 750 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
751 | if (ret <= 0) |
752 | goto error; | |
753 | } | |
754 | if (pp->line) { | |
fb1587d8 MH |
755 | ret = e_snprintf(line, 32, ":%d", pp->line); |
756 | if (ret <= 0) | |
757 | goto error; | |
758 | } | |
759 | if (pp->file) { | |
760 | len = strlen(pp->file) - 32; | |
761 | if (len < 0) | |
762 | len = 0; | |
763 | tmp = strchr(pp->file + len, '/'); | |
764 | if (!tmp) | |
765 | tmp = pp->file + len - 1; | |
766 | ret = e_snprintf(file, 32, "@%s", tmp + 1); | |
4de189fe MH |
767 | if (ret <= 0) |
768 | goto error; | |
769 | } | |
770 | ||
771 | if (pp->function) | |
fb1587d8 MH |
772 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
773 | offs, pp->retprobe ? "%return" : "", line, | |
774 | file); | |
4de189fe | 775 | else |
fb1587d8 | 776 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
777 | if (ret <= 0) |
778 | goto error; | |
779 | ||
780 | return buf; | |
7ef17aaf | 781 | error: |
146a1439 MH |
782 | pr_debug("Failed to synthesize perf probe point: %s", |
783 | strerror(-ret)); | |
784 | free(buf); | |
785 | return NULL; | |
7ef17aaf MH |
786 | } |
787 | ||
4235b045 MH |
788 | #if 0 |
789 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
790 | { |
791 | char *buf; | |
792 | int i, len, ret; | |
793 | ||
4235b045 MH |
794 | buf = synthesize_perf_probe_point(&pev->point); |
795 | if (!buf) | |
796 | return NULL; | |
4de189fe | 797 | |
4235b045 MH |
798 | len = strlen(buf); |
799 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 800 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
801 | pev->args[i].name); |
802 | if (ret <= 0) { | |
803 | free(buf); | |
804 | return NULL; | |
805 | } | |
4de189fe MH |
806 | len += ret; |
807 | } | |
4de189fe | 808 | |
4235b045 MH |
809 | return buf; |
810 | } | |
811 | #endif | |
812 | ||
813 | static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref, | |
814 | char **buf, size_t *buflen, | |
815 | int depth) | |
816 | { | |
817 | int ret; | |
818 | if (ref->next) { | |
819 | depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf, | |
820 | buflen, depth + 1); | |
821 | if (depth < 0) | |
822 | goto out; | |
823 | } | |
824 | ||
825 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
826 | if (ret < 0) | |
827 | depth = ret; | |
828 | else { | |
829 | *buf += ret; | |
830 | *buflen -= ret; | |
831 | } | |
832 | out: | |
833 | return depth; | |
4de189fe | 834 | |
4de189fe MH |
835 | } |
836 | ||
4235b045 MH |
837 | static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg, |
838 | char *buf, size_t buflen) | |
50656eec | 839 | { |
4235b045 MH |
840 | int ret, depth = 0; |
841 | char *tmp = buf; | |
842 | ||
843 | /* Argument name or separator */ | |
844 | if (arg->name) | |
845 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
846 | else | |
847 | ret = e_snprintf(buf, buflen, " "); | |
848 | if (ret < 0) | |
849 | return ret; | |
850 | buf += ret; | |
851 | buflen -= ret; | |
852 | ||
853 | /* Dereferencing arguments */ | |
854 | if (arg->ref) { | |
855 | depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf, | |
856 | &buflen, 1); | |
857 | if (depth < 0) | |
858 | return depth; | |
859 | } | |
860 | ||
861 | /* Print argument value */ | |
862 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
863 | if (ret < 0) | |
864 | return ret; | |
865 | buf += ret; | |
866 | buflen -= ret; | |
867 | ||
868 | /* Closing */ | |
869 | while (depth--) { | |
870 | ret = e_snprintf(buf, buflen, ")"); | |
871 | if (ret < 0) | |
872 | return ret; | |
873 | buf += ret; | |
874 | buflen -= ret; | |
875 | } | |
4984912e MH |
876 | /* Print argument type */ |
877 | if (arg->type) { | |
878 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
879 | if (ret <= 0) | |
880 | return ret; | |
881 | buf += ret; | |
882 | } | |
4235b045 MH |
883 | |
884 | return buf - tmp; | |
885 | } | |
886 | ||
887 | char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev) | |
888 | { | |
889 | struct kprobe_trace_point *tp = &tev->point; | |
50656eec MH |
890 | char *buf; |
891 | int i, len, ret; | |
892 | ||
4235b045 MH |
893 | buf = xzalloc(MAX_CMDLEN); |
894 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", | |
895 | tp->retprobe ? 'r' : 'p', | |
896 | tev->group, tev->event, | |
897 | tp->symbol, tp->offset); | |
898 | if (len <= 0) | |
50656eec | 899 | goto error; |
50656eec | 900 | |
4235b045 MH |
901 | for (i = 0; i < tev->nargs; i++) { |
902 | ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len, | |
903 | MAX_CMDLEN - len); | |
4de189fe | 904 | if (ret <= 0) |
50656eec MH |
905 | goto error; |
906 | len += ret; | |
907 | } | |
50656eec | 908 | |
4235b045 | 909 | return buf; |
50656eec | 910 | error: |
4235b045 MH |
911 | free(buf); |
912 | return NULL; | |
913 | } | |
50656eec | 914 | |
146a1439 MH |
915 | int convert_to_perf_probe_event(struct kprobe_trace_event *tev, |
916 | struct perf_probe_event *pev) | |
4235b045 MH |
917 | { |
918 | char buf[64]; | |
146a1439 | 919 | int i, ret; |
4235b045 | 920 | |
4b4da7f7 | 921 | /* Convert event/group name */ |
fb1587d8 MH |
922 | pev->event = xstrdup(tev->event); |
923 | pev->group = xstrdup(tev->group); | |
924 | ||
4b4da7f7 | 925 | /* Convert trace_point to probe_point */ |
146a1439 MH |
926 | ret = convert_to_perf_probe_point(&tev->point, &pev->point); |
927 | if (ret < 0) | |
928 | return ret; | |
4b4da7f7 | 929 | |
4235b045 MH |
930 | /* Convert trace_arg to probe_arg */ |
931 | pev->nargs = tev->nargs; | |
932 | pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs); | |
146a1439 | 933 | for (i = 0; i < tev->nargs && ret >= 0; i++) |
4235b045 MH |
934 | if (tev->args[i].name) |
935 | pev->args[i].name = xstrdup(tev->args[i].name); | |
936 | else { | |
146a1439 MH |
937 | ret = synthesize_kprobe_trace_arg(&tev->args[i], |
938 | buf, 64); | |
4235b045 MH |
939 | pev->args[i].name = xstrdup(buf); |
940 | } | |
146a1439 MH |
941 | |
942 | if (ret < 0) | |
943 | clear_perf_probe_event(pev); | |
944 | ||
945 | return ret; | |
4235b045 MH |
946 | } |
947 | ||
948 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
949 | { | |
950 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 951 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
952 | int i; |
953 | ||
954 | if (pev->event) | |
955 | free(pev->event); | |
956 | if (pev->group) | |
957 | free(pev->group); | |
958 | if (pp->file) | |
959 | free(pp->file); | |
960 | if (pp->function) | |
961 | free(pp->function); | |
962 | if (pp->lazy_line) | |
963 | free(pp->lazy_line); | |
7df2f329 | 964 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
965 | if (pev->args[i].name) |
966 | free(pev->args[i].name); | |
48481938 MH |
967 | if (pev->args[i].var) |
968 | free(pev->args[i].var); | |
11a1ca35 MH |
969 | if (pev->args[i].type) |
970 | free(pev->args[i].type); | |
7df2f329 MH |
971 | field = pev->args[i].field; |
972 | while (field) { | |
973 | next = field->next; | |
974 | if (field->name) | |
975 | free(field->name); | |
976 | free(field); | |
977 | field = next; | |
978 | } | |
979 | } | |
4235b045 MH |
980 | if (pev->args) |
981 | free(pev->args); | |
982 | memset(pev, 0, sizeof(*pev)); | |
983 | } | |
984 | ||
985 | void clear_kprobe_trace_event(struct kprobe_trace_event *tev) | |
986 | { | |
987 | struct kprobe_trace_arg_ref *ref, *next; | |
988 | int i; | |
989 | ||
990 | if (tev->event) | |
991 | free(tev->event); | |
992 | if (tev->group) | |
993 | free(tev->group); | |
994 | if (tev->point.symbol) | |
995 | free(tev->point.symbol); | |
996 | for (i = 0; i < tev->nargs; i++) { | |
997 | if (tev->args[i].name) | |
998 | free(tev->args[i].name); | |
999 | if (tev->args[i].value) | |
1000 | free(tev->args[i].value); | |
4984912e MH |
1001 | if (tev->args[i].type) |
1002 | free(tev->args[i].type); | |
4235b045 MH |
1003 | ref = tev->args[i].ref; |
1004 | while (ref) { | |
1005 | next = ref->next; | |
1006 | free(ref); | |
1007 | ref = next; | |
1008 | } | |
1009 | } | |
1010 | if (tev->args) | |
1011 | free(tev->args); | |
1012 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
1013 | } |
1014 | ||
f4d7da49 | 1015 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
1016 | { |
1017 | char buf[PATH_MAX]; | |
1018 | int ret; | |
1019 | ||
1020 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
146a1439 MH |
1021 | if (ret >= 0) { |
1022 | if (readwrite && !probe_event_dry_run) | |
1023 | ret = open(buf, O_RDWR, O_APPEND); | |
1024 | else | |
1025 | ret = open(buf, O_RDONLY, 0); | |
1026 | } | |
f4d7da49 | 1027 | |
4de189fe MH |
1028 | if (ret < 0) { |
1029 | if (errno == ENOENT) | |
146a1439 MH |
1030 | pr_warning("kprobe_events file does not exist - please" |
1031 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); | |
4de189fe | 1032 | else |
146a1439 MH |
1033 | pr_warning("Failed to open kprobe_events file: %s\n", |
1034 | strerror(errno)); | |
4de189fe MH |
1035 | } |
1036 | return ret; | |
1037 | } | |
1038 | ||
1039 | /* Get raw string list of current kprobe_events */ | |
4235b045 | 1040 | static struct strlist *get_kprobe_trace_command_rawlist(int fd) |
4de189fe MH |
1041 | { |
1042 | int ret, idx; | |
1043 | FILE *fp; | |
1044 | char buf[MAX_CMDLEN]; | |
1045 | char *p; | |
1046 | struct strlist *sl; | |
1047 | ||
1048 | sl = strlist__new(true, NULL); | |
1049 | ||
1050 | fp = fdopen(dup(fd), "r"); | |
1051 | while (!feof(fp)) { | |
1052 | p = fgets(buf, MAX_CMDLEN, fp); | |
1053 | if (!p) | |
1054 | break; | |
1055 | ||
1056 | idx = strlen(p) - 1; | |
1057 | if (p[idx] == '\n') | |
1058 | p[idx] = '\0'; | |
1059 | ret = strlist__add(sl, buf); | |
146a1439 MH |
1060 | if (ret < 0) { |
1061 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); | |
1062 | strlist__delete(sl); | |
1063 | return NULL; | |
1064 | } | |
4de189fe MH |
1065 | } |
1066 | fclose(fp); | |
1067 | ||
1068 | return sl; | |
1069 | } | |
1070 | ||
278498d4 | 1071 | /* Show an event */ |
146a1439 | 1072 | static int show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 1073 | { |
7e990a51 | 1074 | int i, ret; |
278498d4 | 1075 | char buf[128]; |
4235b045 | 1076 | char *place; |
278498d4 | 1077 | |
4235b045 MH |
1078 | /* Synthesize only event probe point */ |
1079 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
1080 | if (!place) |
1081 | return -EINVAL; | |
4235b045 MH |
1082 | |
1083 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 | 1084 | if (ret < 0) |
146a1439 MH |
1085 | return ret; |
1086 | ||
fb1587d8 | 1087 | printf(" %-20s (on %s", buf, place); |
278498d4 | 1088 | |
4235b045 | 1089 | if (pev->nargs > 0) { |
278498d4 | 1090 | printf(" with"); |
7df2f329 | 1091 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
1092 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1093 | buf, 128); | |
1094 | if (ret < 0) | |
1095 | break; | |
7df2f329 MH |
1096 | printf(" %s", buf); |
1097 | } | |
278498d4 MH |
1098 | } |
1099 | printf(")\n"); | |
4235b045 | 1100 | free(place); |
146a1439 | 1101 | return ret; |
278498d4 MH |
1102 | } |
1103 | ||
4de189fe | 1104 | /* List up current perf-probe events */ |
146a1439 | 1105 | int show_perf_probe_events(void) |
4de189fe | 1106 | { |
146a1439 | 1107 | int fd, ret; |
4235b045 MH |
1108 | struct kprobe_trace_event tev; |
1109 | struct perf_probe_event pev; | |
4de189fe MH |
1110 | struct strlist *rawlist; |
1111 | struct str_node *ent; | |
1112 | ||
72041334 | 1113 | setup_pager(); |
146a1439 MH |
1114 | ret = init_vmlinux(); |
1115 | if (ret < 0) | |
1116 | return ret; | |
4235b045 MH |
1117 | |
1118 | memset(&tev, 0, sizeof(tev)); | |
1119 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 1120 | |
f4d7da49 | 1121 | fd = open_kprobe_events(false); |
146a1439 MH |
1122 | if (fd < 0) |
1123 | return fd; | |
1124 | ||
4235b045 | 1125 | rawlist = get_kprobe_trace_command_rawlist(fd); |
4de189fe | 1126 | close(fd); |
146a1439 MH |
1127 | if (!rawlist) |
1128 | return -ENOENT; | |
4de189fe | 1129 | |
adf365f4 | 1130 | strlist__for_each(ent, rawlist) { |
146a1439 MH |
1131 | ret = parse_kprobe_trace_command(ent->s, &tev); |
1132 | if (ret >= 0) { | |
1133 | ret = convert_to_perf_probe_event(&tev, &pev); | |
1134 | if (ret >= 0) | |
1135 | ret = show_perf_probe_event(&pev); | |
1136 | } | |
4235b045 MH |
1137 | clear_perf_probe_event(&pev); |
1138 | clear_kprobe_trace_event(&tev); | |
146a1439 MH |
1139 | if (ret < 0) |
1140 | break; | |
4de189fe | 1141 | } |
4de189fe | 1142 | strlist__delete(rawlist); |
146a1439 MH |
1143 | |
1144 | return ret; | |
4de189fe MH |
1145 | } |
1146 | ||
b498ce1f | 1147 | /* Get current perf-probe event names */ |
4235b045 | 1148 | static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group) |
b498ce1f | 1149 | { |
fa28244d | 1150 | char buf[128]; |
b498ce1f MH |
1151 | struct strlist *sl, *rawlist; |
1152 | struct str_node *ent; | |
4235b045 | 1153 | struct kprobe_trace_event tev; |
146a1439 | 1154 | int ret = 0; |
b498ce1f | 1155 | |
4235b045 | 1156 | memset(&tev, 0, sizeof(tev)); |
b498ce1f | 1157 | |
4235b045 | 1158 | rawlist = get_kprobe_trace_command_rawlist(fd); |
e1d2017b | 1159 | sl = strlist__new(true, NULL); |
adf365f4 | 1160 | strlist__for_each(ent, rawlist) { |
146a1439 MH |
1161 | ret = parse_kprobe_trace_command(ent->s, &tev); |
1162 | if (ret < 0) | |
1163 | break; | |
fa28244d | 1164 | if (include_group) { |
146a1439 MH |
1165 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1166 | tev.event); | |
1167 | if (ret >= 0) | |
1168 | ret = strlist__add(sl, buf); | |
fa28244d | 1169 | } else |
146a1439 | 1170 | ret = strlist__add(sl, tev.event); |
4235b045 | 1171 | clear_kprobe_trace_event(&tev); |
146a1439 MH |
1172 | if (ret < 0) |
1173 | break; | |
b498ce1f | 1174 | } |
b498ce1f MH |
1175 | strlist__delete(rawlist); |
1176 | ||
146a1439 MH |
1177 | if (ret < 0) { |
1178 | strlist__delete(sl); | |
1179 | return NULL; | |
1180 | } | |
b498ce1f MH |
1181 | return sl; |
1182 | } | |
1183 | ||
146a1439 | 1184 | static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev) |
50656eec MH |
1185 | { |
1186 | int ret; | |
4235b045 | 1187 | char *buf = synthesize_kprobe_trace_command(tev); |
50656eec | 1188 | |
146a1439 MH |
1189 | if (!buf) { |
1190 | pr_debug("Failed to synthesize kprobe trace event.\n"); | |
1191 | return -EINVAL; | |
1192 | } | |
1193 | ||
fa28244d | 1194 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1195 | if (!probe_event_dry_run) { |
1196 | ret = write(fd, buf, strlen(buf)); | |
1197 | if (ret <= 0) | |
146a1439 MH |
1198 | pr_warning("Failed to write event: %s\n", |
1199 | strerror(errno)); | |
f4d7da49 | 1200 | } |
4235b045 | 1201 | free(buf); |
146a1439 | 1202 | return ret; |
50656eec MH |
1203 | } |
1204 | ||
146a1439 MH |
1205 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1206 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
1207 | { |
1208 | int i, ret; | |
17f88fcd MH |
1209 | |
1210 | /* Try no suffix */ | |
1211 | ret = e_snprintf(buf, len, "%s", base); | |
146a1439 MH |
1212 | if (ret < 0) { |
1213 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1214 | return ret; | |
1215 | } | |
17f88fcd | 1216 | if (!strlist__has_entry(namelist, buf)) |
146a1439 | 1217 | return 0; |
17f88fcd | 1218 | |
d761b08b MH |
1219 | if (!allow_suffix) { |
1220 | pr_warning("Error: event \"%s\" already exists. " | |
1221 | "(Use -f to force duplicates.)\n", base); | |
146a1439 | 1222 | return -EEXIST; |
d761b08b MH |
1223 | } |
1224 | ||
17f88fcd MH |
1225 | /* Try to add suffix */ |
1226 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f | 1227 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
146a1439 MH |
1228 | if (ret < 0) { |
1229 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1230 | return ret; | |
1231 | } | |
b498ce1f MH |
1232 | if (!strlist__has_entry(namelist, buf)) |
1233 | break; | |
1234 | } | |
146a1439 MH |
1235 | if (i == MAX_EVENT_INDEX) { |
1236 | pr_warning("Too many events are on the same function.\n"); | |
1237 | ret = -ERANGE; | |
1238 | } | |
1239 | ||
1240 | return ret; | |
b498ce1f MH |
1241 | } |
1242 | ||
146a1439 MH |
1243 | static int __add_kprobe_trace_events(struct perf_probe_event *pev, |
1244 | struct kprobe_trace_event *tevs, | |
1245 | int ntevs, bool allow_suffix) | |
50656eec | 1246 | { |
146a1439 | 1247 | int i, fd, ret; |
55632770 | 1248 | struct kprobe_trace_event *tev = NULL; |
4235b045 MH |
1249 | char buf[64]; |
1250 | const char *event, *group; | |
b498ce1f | 1251 | struct strlist *namelist; |
50656eec | 1252 | |
f4d7da49 | 1253 | fd = open_kprobe_events(true); |
146a1439 MH |
1254 | if (fd < 0) |
1255 | return fd; | |
b498ce1f | 1256 | /* Get current event names */ |
4235b045 | 1257 | namelist = get_kprobe_trace_event_names(fd, false); |
146a1439 MH |
1258 | if (!namelist) { |
1259 | pr_debug("Failed to get current event list.\n"); | |
1260 | return -EIO; | |
1261 | } | |
4235b045 | 1262 | |
146a1439 | 1263 | ret = 0; |
4235b045 | 1264 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
146a1439 | 1265 | for (i = 0; i < ntevs && ret >= 0; i++) { |
4235b045 MH |
1266 | tev = &tevs[i]; |
1267 | if (pev->event) | |
1268 | event = pev->event; | |
1269 | else | |
1270 | if (pev->point.function) | |
1271 | event = pev->point.function; | |
1272 | else | |
1273 | event = tev->point.symbol; | |
1274 | if (pev->group) | |
1275 | group = pev->group; | |
1276 | else | |
1277 | group = PERFPROBE_GROUP; | |
1278 | ||
1279 | /* Get an unused new event name */ | |
146a1439 MH |
1280 | ret = get_new_event_name(buf, 64, event, |
1281 | namelist, allow_suffix); | |
1282 | if (ret < 0) | |
1283 | break; | |
4235b045 MH |
1284 | event = buf; |
1285 | ||
1286 | tev->event = xstrdup(event); | |
1287 | tev->group = xstrdup(group); | |
146a1439 MH |
1288 | ret = write_kprobe_trace_event(fd, tev); |
1289 | if (ret < 0) | |
1290 | break; | |
4235b045 MH |
1291 | /* Add added event name to namelist */ |
1292 | strlist__add(namelist, event); | |
1293 | ||
1294 | /* Trick here - save current event/group */ | |
1295 | event = pev->event; | |
1296 | group = pev->group; | |
1297 | pev->event = tev->event; | |
1298 | pev->group = tev->group; | |
1299 | show_perf_probe_event(pev); | |
1300 | /* Trick here - restore current event/group */ | |
1301 | pev->event = (char *)event; | |
1302 | pev->group = (char *)group; | |
1303 | ||
1304 | /* | |
1305 | * Probes after the first probe which comes from same | |
1306 | * user input are always allowed to add suffix, because | |
1307 | * there might be several addresses corresponding to | |
1308 | * one code line. | |
1309 | */ | |
1310 | allow_suffix = true; | |
50656eec | 1311 | } |
146a1439 MH |
1312 | |
1313 | if (ret >= 0) { | |
1314 | /* Show how to use the event. */ | |
1315 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
1316 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, | |
1317 | tev->event); | |
1318 | } | |
a9b495b0 | 1319 | |
e1d2017b | 1320 | strlist__delete(namelist); |
50656eec | 1321 | close(fd); |
146a1439 | 1322 | return ret; |
50656eec | 1323 | } |
fa28244d | 1324 | |
4235b045 MH |
1325 | static int convert_to_kprobe_trace_events(struct perf_probe_event *pev, |
1326 | struct kprobe_trace_event **tevs) | |
e0faa8d3 MH |
1327 | { |
1328 | struct symbol *sym; | |
4235b045 MH |
1329 | int ntevs = 0, i; |
1330 | struct kprobe_trace_event *tev; | |
1331 | ||
4b4da7f7 MH |
1332 | /* Convert perf_probe_event with debuginfo */ |
1333 | ntevs = try_to_find_kprobe_trace_events(pev, tevs); | |
146a1439 | 1334 | if (ntevs != 0) |
4b4da7f7 | 1335 | return ntevs; |
e0faa8d3 | 1336 | |
4235b045 MH |
1337 | /* Allocate trace event buffer */ |
1338 | ntevs = 1; | |
1339 | tev = *tevs = xzalloc(sizeof(struct kprobe_trace_event)); | |
1340 | ||
1341 | /* Copy parameters */ | |
1342 | tev->point.symbol = xstrdup(pev->point.function); | |
1343 | tev->point.offset = pev->point.offset; | |
1344 | tev->nargs = pev->nargs; | |
1345 | if (tev->nargs) { | |
1346 | tev->args = xzalloc(sizeof(struct kprobe_trace_arg) | |
1347 | * tev->nargs); | |
48481938 MH |
1348 | for (i = 0; i < tev->nargs; i++) { |
1349 | if (pev->args[i].name) | |
1350 | tev->args[i].name = xstrdup(pev->args[i].name); | |
1351 | tev->args[i].value = xstrdup(pev->args[i].var); | |
11a1ca35 MH |
1352 | if (pev->args[i].type) |
1353 | tev->args[i].type = xstrdup(pev->args[i].type); | |
48481938 | 1354 | } |
4235b045 MH |
1355 | } |
1356 | ||
1357 | /* Currently just checking function name from symbol map */ | |
1358 | sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION], | |
1359 | tev->point.symbol, NULL); | |
146a1439 MH |
1360 | if (!sym) { |
1361 | pr_warning("Kernel symbol \'%s\' not found.\n", | |
1362 | tev->point.symbol); | |
1363 | return -ENOENT; | |
1364 | } | |
4235b045 MH |
1365 | return ntevs; |
1366 | } | |
1367 | ||
1368 | struct __event_package { | |
1369 | struct perf_probe_event *pev; | |
1370 | struct kprobe_trace_event *tevs; | |
1371 | int ntevs; | |
1372 | }; | |
1373 | ||
146a1439 MH |
1374 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
1375 | bool force_add) | |
4235b045 | 1376 | { |
146a1439 | 1377 | int i, j, ret; |
4235b045 MH |
1378 | struct __event_package *pkgs; |
1379 | ||
1380 | pkgs = xzalloc(sizeof(struct __event_package) * npevs); | |
1381 | ||
1382 | /* Init vmlinux path */ | |
146a1439 MH |
1383 | ret = init_vmlinux(); |
1384 | if (ret < 0) | |
1385 | return ret; | |
4235b045 MH |
1386 | |
1387 | /* Loop 1: convert all events */ | |
1388 | for (i = 0; i < npevs; i++) { | |
1389 | pkgs[i].pev = &pevs[i]; | |
1390 | /* Convert with or without debuginfo */ | |
146a1439 MH |
1391 | ret = convert_to_kprobe_trace_events(pkgs[i].pev, |
1392 | &pkgs[i].tevs); | |
1393 | if (ret < 0) | |
1394 | goto end; | |
1395 | pkgs[i].ntevs = ret; | |
e0faa8d3 MH |
1396 | } |
1397 | ||
4235b045 | 1398 | /* Loop 2: add all events */ |
146a1439 MH |
1399 | for (i = 0; i < npevs && ret >= 0; i++) |
1400 | ret = __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs, | |
1401 | pkgs[i].ntevs, force_add); | |
1402 | end: | |
1403 | /* Loop 3: cleanup trace events */ | |
4235b045 | 1404 | for (i = 0; i < npevs; i++) |
146a1439 MH |
1405 | for (j = 0; j < pkgs[i].ntevs; j++) |
1406 | clear_kprobe_trace_event(&pkgs[i].tevs[j]); | |
1407 | ||
1408 | return ret; | |
e0faa8d3 MH |
1409 | } |
1410 | ||
146a1439 | 1411 | static int __del_trace_kprobe_event(int fd, struct str_node *ent) |
bbbb521b MH |
1412 | { |
1413 | char *p; | |
1414 | char buf[128]; | |
4235b045 | 1415 | int ret; |
bbbb521b MH |
1416 | |
1417 | /* Convert from perf-probe event to trace-kprobe event */ | |
146a1439 MH |
1418 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1419 | if (ret < 0) | |
1420 | goto error; | |
1421 | ||
bbbb521b | 1422 | p = strchr(buf + 2, ':'); |
146a1439 MH |
1423 | if (!p) { |
1424 | pr_debug("Internal error: %s should have ':' but not.\n", | |
1425 | ent->s); | |
1426 | ret = -ENOTSUP; | |
1427 | goto error; | |
1428 | } | |
bbbb521b MH |
1429 | *p = '/'; |
1430 | ||
4235b045 MH |
1431 | pr_debug("Writing event: %s\n", buf); |
1432 | ret = write(fd, buf, strlen(buf)); | |
146a1439 MH |
1433 | if (ret < 0) |
1434 | goto error; | |
1435 | ||
bbbb521b | 1436 | printf("Remove event: %s\n", ent->s); |
146a1439 MH |
1437 | return 0; |
1438 | error: | |
1439 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); | |
1440 | return ret; | |
bbbb521b MH |
1441 | } |
1442 | ||
146a1439 MH |
1443 | static int del_trace_kprobe_event(int fd, const char *group, |
1444 | const char *event, struct strlist *namelist) | |
fa28244d MH |
1445 | { |
1446 | char buf[128]; | |
bbbb521b | 1447 | struct str_node *ent, *n; |
146a1439 | 1448 | int found = 0, ret = 0; |
fa28244d | 1449 | |
146a1439 MH |
1450 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1451 | if (ret < 0) { | |
1452 | pr_err("Failed to copy event."); | |
1453 | return ret; | |
1454 | } | |
fa28244d | 1455 | |
bbbb521b MH |
1456 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1457 | strlist__for_each_safe(ent, n, namelist) | |
1458 | if (strglobmatch(ent->s, buf)) { | |
1459 | found++; | |
146a1439 MH |
1460 | ret = __del_trace_kprobe_event(fd, ent); |
1461 | if (ret < 0) | |
1462 | break; | |
bbbb521b MH |
1463 | strlist__remove(namelist, ent); |
1464 | } | |
1465 | } else { | |
1466 | ent = strlist__find(namelist, buf); | |
1467 | if (ent) { | |
1468 | found++; | |
146a1439 MH |
1469 | ret = __del_trace_kprobe_event(fd, ent); |
1470 | if (ret >= 0) | |
1471 | strlist__remove(namelist, ent); | |
bbbb521b MH |
1472 | } |
1473 | } | |
146a1439 MH |
1474 | if (found == 0 && ret >= 0) |
1475 | pr_info("Info: Event \"%s\" does not exist.\n", buf); | |
1476 | ||
1477 | return ret; | |
fa28244d MH |
1478 | } |
1479 | ||
146a1439 | 1480 | int del_perf_probe_events(struct strlist *dellist) |
fa28244d | 1481 | { |
146a1439 | 1482 | int fd, ret = 0; |
fa28244d MH |
1483 | const char *group, *event; |
1484 | char *p, *str; | |
1485 | struct str_node *ent; | |
1486 | struct strlist *namelist; | |
1487 | ||
f4d7da49 | 1488 | fd = open_kprobe_events(true); |
146a1439 MH |
1489 | if (fd < 0) |
1490 | return fd; | |
1491 | ||
fa28244d | 1492 | /* Get current event names */ |
4235b045 | 1493 | namelist = get_kprobe_trace_event_names(fd, true); |
146a1439 MH |
1494 | if (namelist == NULL) |
1495 | return -EINVAL; | |
fa28244d | 1496 | |
adf365f4 | 1497 | strlist__for_each(ent, dellist) { |
31facc5f | 1498 | str = xstrdup(ent->s); |
bbbb521b | 1499 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1500 | p = strchr(str, ':'); |
1501 | if (p) { | |
1502 | group = str; | |
1503 | *p = '\0'; | |
1504 | event = p + 1; | |
1505 | } else { | |
bbbb521b | 1506 | group = "*"; |
fa28244d MH |
1507 | event = str; |
1508 | } | |
bbbb521b | 1509 | pr_debug("Group: %s, Event: %s\n", group, event); |
146a1439 | 1510 | ret = del_trace_kprobe_event(fd, group, event, namelist); |
fa28244d | 1511 | free(str); |
146a1439 MH |
1512 | if (ret < 0) |
1513 | break; | |
fa28244d MH |
1514 | } |
1515 | strlist__delete(namelist); | |
1516 | close(fd); | |
146a1439 MH |
1517 | |
1518 | return ret; | |
fa28244d MH |
1519 | } |
1520 |