]>
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 | ||
50656eec MH |
56 | #define semantic_error(msg ...) die("Semantic error :" msg) |
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 */ |
e0faa8d3 MH |
79 | static void init_vmlinux(void) |
80 | { | |
81 | symbol_conf.sort_by_name = true; | |
82 | if (symbol_conf.vmlinux_name == NULL) | |
83 | symbol_conf.try_vmlinux_path = true; | |
84 | else | |
85 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
86 | if (symbol__init() < 0) | |
87 | die("Failed to init symbol map."); | |
88 | ||
89 | map_groups__init(&kmap_groups); | |
90 | if (map_groups__create_kernel_maps(&kmap_groups, kmaps) < 0) | |
91 | die("Failed to create kernel maps."); | |
92 | } | |
93 | ||
4b4da7f7 | 94 | #ifdef DWARF_SUPPORT |
e0faa8d3 MH |
95 | static int open_vmlinux(void) |
96 | { | |
97 | if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) { | |
98 | pr_debug("Failed to load kernel map.\n"); | |
99 | return -EINVAL; | |
100 | } | |
101 | pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name); | |
102 | return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY); | |
103 | } | |
4b4da7f7 MH |
104 | |
105 | static void convert_to_perf_probe_point(struct kprobe_trace_point *tp, | |
106 | struct perf_probe_point *pp) | |
107 | { | |
108 | struct symbol *sym; | |
109 | int fd, ret = 0; | |
110 | ||
111 | sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION], | |
112 | tp->symbol, NULL); | |
113 | if (sym) { | |
114 | fd = open_vmlinux(); | |
115 | ret = find_perf_probe_point(fd, sym->start + tp->offset, pp); | |
116 | close(fd); | |
117 | } | |
118 | if (ret <= 0) { | |
119 | pp->function = xstrdup(tp->symbol); | |
120 | pp->offset = tp->offset; | |
121 | } | |
122 | pp->retprobe = tp->retprobe; | |
123 | } | |
124 | ||
125 | /* Try to find perf_probe_event with debuginfo */ | |
126 | static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, | |
127 | struct kprobe_trace_event **tevs) | |
128 | { | |
129 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
130 | int fd, ntevs; | |
131 | ||
132 | fd = open_vmlinux(); | |
133 | if (fd < 0) { | |
134 | if (need_dwarf) | |
135 | die("Could not open debuginfo file."); | |
136 | ||
137 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* Searching trace events corresponding to probe event */ | |
142 | ntevs = find_kprobe_trace_events(fd, pev, tevs); | |
143 | close(fd); | |
144 | ||
145 | if (ntevs > 0) /* Succeeded to find trace events */ | |
146 | return ntevs; | |
147 | ||
148 | if (ntevs == 0) /* No error but failed to find probe point. */ | |
149 | die("Probe point '%s' not found. - probe not added.", | |
150 | synthesize_perf_probe_point(&pev->point)); | |
151 | ||
152 | /* Error path */ | |
153 | if (need_dwarf) { | |
154 | if (ntevs == -ENOENT) | |
155 | pr_warning("No dwarf info found in the vmlinux - " | |
156 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
157 | die("Could not analyze debuginfo."); | |
158 | } | |
159 | pr_debug("An error occurred in debuginfo analysis." | |
160 | " Try to use symbols.\n"); | |
161 | return 0; | |
162 | ||
163 | } | |
164 | ||
165 | #define LINEBUF_SIZE 256 | |
166 | #define NR_ADDITIONAL_LINES 2 | |
167 | ||
168 | static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num) | |
169 | { | |
170 | char buf[LINEBUF_SIZE]; | |
171 | const char *color = PERF_COLOR_BLUE; | |
172 | ||
173 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
174 | goto error; | |
175 | if (!skip) { | |
176 | if (show_num) | |
177 | fprintf(stdout, "%7u %s", l, buf); | |
178 | else | |
179 | color_fprintf(stdout, color, " %s", buf); | |
180 | } | |
181 | ||
182 | while (strlen(buf) == LINEBUF_SIZE - 1 && | |
183 | buf[LINEBUF_SIZE - 2] != '\n') { | |
184 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) | |
185 | goto error; | |
186 | if (!skip) { | |
187 | if (show_num) | |
188 | fprintf(stdout, "%s", buf); | |
189 | else | |
190 | color_fprintf(stdout, color, "%s", buf); | |
191 | } | |
192 | } | |
193 | return; | |
194 | error: | |
195 | if (feof(fp)) | |
196 | die("Source file is shorter than expected."); | |
197 | else | |
198 | die("File read error: %s", strerror(errno)); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Show line-range always requires debuginfo to find source file and | |
203 | * line number. | |
204 | */ | |
205 | void show_line_range(struct line_range *lr) | |
206 | { | |
207 | unsigned int l = 1; | |
208 | struct line_node *ln; | |
209 | FILE *fp; | |
210 | int fd, ret; | |
211 | ||
212 | /* Search a line range */ | |
213 | init_vmlinux(); | |
214 | fd = open_vmlinux(); | |
215 | if (fd < 0) | |
216 | die("Could not open debuginfo file."); | |
217 | ret = find_line_range(fd, lr); | |
218 | if (ret <= 0) | |
219 | die("Source line is not found.\n"); | |
220 | close(fd); | |
221 | ||
222 | setup_pager(); | |
223 | ||
224 | if (lr->function) | |
225 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
226 | lr->start - lr->offset); | |
227 | else | |
228 | fprintf(stdout, "<%s:%d>\n", lr->file, lr->start); | |
229 | ||
230 | fp = fopen(lr->path, "r"); | |
231 | if (fp == NULL) | |
232 | die("Failed to open %s: %s", lr->path, strerror(errno)); | |
233 | /* Skip to starting line number */ | |
234 | while (l < lr->start) | |
235 | show_one_line(fp, l++, true, false); | |
236 | ||
237 | list_for_each_entry(ln, &lr->line_list, list) { | |
238 | while (ln->line > l) | |
239 | show_one_line(fp, (l++) - lr->offset, false, false); | |
240 | show_one_line(fp, (l++) - lr->offset, false, true); | |
241 | } | |
242 | ||
243 | if (lr->end == INT_MAX) | |
244 | lr->end = l + NR_ADDITIONAL_LINES; | |
245 | while (l < lr->end && !feof(fp)) | |
246 | show_one_line(fp, (l++) - lr->offset, false, false); | |
247 | ||
248 | fclose(fp); | |
249 | } | |
250 | ||
251 | #else /* !DWARF_SUPPORT */ | |
252 | ||
253 | static void convert_to_perf_probe_point(struct kprobe_trace_point *tp, | |
254 | struct perf_probe_point *pp) | |
255 | { | |
256 | pp->function = xstrdup(tp->symbol); | |
257 | pp->offset = tp->offset; | |
258 | pp->retprobe = tp->retprobe; | |
259 | } | |
260 | ||
261 | static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, | |
262 | struct kprobe_trace_event **tevs __unused) | |
263 | { | |
264 | if (perf_probe_event_need_dwarf(pev)) | |
265 | die("Debuginfo-analysis is not supported"); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | void show_line_range(struct line_range *lr __unused) | |
270 | { | |
271 | die("Debuginfo-analysis is not supported"); | |
272 | } | |
273 | ||
e0faa8d3 MH |
274 | #endif |
275 | ||
631c9def MH |
276 | void parse_line_range_desc(const char *arg, struct line_range *lr) |
277 | { | |
278 | const char *ptr; | |
279 | char *tmp; | |
280 | /* | |
281 | * <Syntax> | |
282 | * SRC:SLN[+NUM|-ELN] | |
283 | * FUNC[:SLN[+NUM|-ELN]] | |
284 | */ | |
285 | ptr = strchr(arg, ':'); | |
286 | if (ptr) { | |
287 | lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0); | |
288 | if (*tmp == '+') | |
289 | lr->end = lr->start + (unsigned int)strtoul(tmp + 1, | |
290 | &tmp, 0); | |
291 | else if (*tmp == '-') | |
292 | lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0); | |
293 | else | |
294 | lr->end = 0; | |
295 | pr_debug("Line range is %u to %u\n", lr->start, lr->end); | |
296 | if (lr->end && lr->start > lr->end) | |
297 | semantic_error("Start line must be smaller" | |
298 | " than end line."); | |
299 | if (*tmp != '\0') | |
300 | semantic_error("Tailing with invalid character '%d'.", | |
301 | *tmp); | |
31facc5f | 302 | tmp = xstrndup(arg, (ptr - arg)); |
631c9def | 303 | } else |
31facc5f | 304 | tmp = xstrdup(arg); |
631c9def MH |
305 | |
306 | if (strchr(tmp, '.')) | |
307 | lr->file = tmp; | |
308 | else | |
309 | lr->function = tmp; | |
310 | } | |
311 | ||
b7702a21 MH |
312 | /* Check the name is good for event/group */ |
313 | static bool check_event_name(const char *name) | |
314 | { | |
315 | if (!isalpha(*name) && *name != '_') | |
316 | return false; | |
317 | while (*++name != '\0') { | |
318 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
319 | return false; | |
320 | } | |
321 | return true; | |
322 | } | |
323 | ||
50656eec | 324 | /* Parse probepoint definition. */ |
4235b045 | 325 | static void parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 326 | { |
4235b045 | 327 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
328 | char *ptr, *tmp; |
329 | char c, nc = 0; | |
330 | /* | |
331 | * <Syntax> | |
2a9c8c36 MH |
332 | * perf probe [EVENT=]SRC[:LN|;PTN] |
333 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
334 | * |
335 | * TODO:Group name support | |
50656eec MH |
336 | */ |
337 | ||
2a9c8c36 MH |
338 | ptr = strpbrk(arg, ";=@+%"); |
339 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
340 | *ptr = '\0'; |
341 | tmp = ptr + 1; | |
342 | ptr = strchr(arg, ':'); | |
343 | if (ptr) /* Group name is not supported yet. */ | |
344 | semantic_error("Group name is not supported yet."); | |
b7702a21 MH |
345 | if (!check_event_name(arg)) |
346 | semantic_error("%s is bad for event name -it must " | |
347 | "follow C symbol-naming rule.", arg); | |
4235b045 MH |
348 | pev->event = xstrdup(arg); |
349 | pev->group = NULL; | |
af663d75 MH |
350 | arg = tmp; |
351 | } | |
352 | ||
2a9c8c36 | 353 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
354 | if (ptr) { |
355 | nc = *ptr; | |
356 | *ptr++ = '\0'; | |
357 | } | |
358 | ||
359 | /* Check arg is function or file and copy it */ | |
360 | if (strchr(arg, '.')) /* File */ | |
31facc5f | 361 | pp->file = xstrdup(arg); |
50656eec | 362 | else /* Function */ |
31facc5f | 363 | pp->function = xstrdup(arg); |
50656eec MH |
364 | |
365 | /* Parse other options */ | |
366 | while (ptr) { | |
367 | arg = ptr; | |
368 | c = nc; | |
2a9c8c36 | 369 | if (c == ';') { /* Lazy pattern must be the last part */ |
31facc5f | 370 | pp->lazy_line = xstrdup(arg); |
2a9c8c36 MH |
371 | break; |
372 | } | |
373 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
374 | if (ptr) { |
375 | nc = *ptr; | |
376 | *ptr++ = '\0'; | |
377 | } | |
378 | switch (c) { | |
379 | case ':': /* Line number */ | |
380 | pp->line = strtoul(arg, &tmp, 0); | |
381 | if (*tmp != '\0') | |
2a9c8c36 MH |
382 | semantic_error("There is non-digit char" |
383 | " in line number."); | |
50656eec MH |
384 | break; |
385 | case '+': /* Byte offset from a symbol */ | |
386 | pp->offset = strtoul(arg, &tmp, 0); | |
387 | if (*tmp != '\0') | |
2a9c8c36 | 388 | semantic_error("There is non-digit character" |
50656eec MH |
389 | " in offset."); |
390 | break; | |
391 | case '@': /* File name */ | |
392 | if (pp->file) | |
393 | semantic_error("SRC@SRC is not allowed."); | |
31facc5f | 394 | pp->file = xstrdup(arg); |
50656eec MH |
395 | break; |
396 | case '%': /* Probe places */ | |
397 | if (strcmp(arg, "return") == 0) { | |
398 | pp->retprobe = 1; | |
399 | } else /* Others not supported yet */ | |
400 | semantic_error("%%%s is not supported.", arg); | |
401 | break; | |
402 | default: | |
403 | DIE_IF("Program has a bug."); | |
404 | break; | |
405 | } | |
406 | } | |
407 | ||
408 | /* Exclusion check */ | |
2a9c8c36 MH |
409 | if (pp->lazy_line && pp->line) |
410 | semantic_error("Lazy pattern can't be used with line number."); | |
411 | ||
412 | if (pp->lazy_line && pp->offset) | |
413 | semantic_error("Lazy pattern can't be used with offset."); | |
414 | ||
50656eec MH |
415 | if (pp->line && pp->offset) |
416 | semantic_error("Offset can't be used with line number."); | |
417 | ||
2a9c8c36 MH |
418 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) |
419 | semantic_error("File always requires line number or " | |
420 | "lazy pattern."); | |
50656eec MH |
421 | |
422 | if (pp->offset && !pp->function) | |
423 | semantic_error("Offset requires an entry function."); | |
424 | ||
425 | if (pp->retprobe && !pp->function) | |
426 | semantic_error("Return probe requires an entry function."); | |
427 | ||
2a9c8c36 MH |
428 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) |
429 | semantic_error("Offset/Line/Lazy pattern can't be used with " | |
430 | "return probe."); | |
50656eec | 431 | |
4235b045 | 432 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
433 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
434 | pp->lazy_line); | |
50656eec MH |
435 | } |
436 | ||
7df2f329 MH |
437 | /* Parse perf-probe event argument */ |
438 | static void parse_perf_probe_arg(const char *str, struct perf_probe_arg *arg) | |
439 | { | |
48481938 | 440 | char *tmp; |
7df2f329 MH |
441 | struct perf_probe_arg_field **fieldp; |
442 | ||
443 | pr_debug("parsing arg: %s into ", str); | |
444 | ||
48481938 MH |
445 | tmp = strchr(str, '='); |
446 | if (tmp) { | |
447 | arg->name = xstrndup(str, tmp - str); | |
448 | str = tmp + 1; | |
449 | } | |
450 | ||
7df2f329 MH |
451 | tmp = strpbrk(str, "-."); |
452 | if (!is_c_varname(str) || !tmp) { | |
453 | /* A variable, register, symbol or special value */ | |
48481938 MH |
454 | arg->var = xstrdup(str); |
455 | pr_debug("%s\n", arg->var); | |
7df2f329 MH |
456 | return; |
457 | } | |
458 | ||
459 | /* Structure fields */ | |
48481938 MH |
460 | arg->var = xstrndup(str, tmp - str); |
461 | pr_debug("%s, ", arg->var); | |
7df2f329 MH |
462 | fieldp = &arg->field; |
463 | ||
464 | do { | |
465 | *fieldp = xzalloc(sizeof(struct perf_probe_arg_field)); | |
466 | if (*tmp == '.') { | |
467 | str = tmp + 1; | |
468 | (*fieldp)->ref = false; | |
469 | } else if (tmp[1] == '>') { | |
470 | str = tmp + 2; | |
471 | (*fieldp)->ref = true; | |
472 | } else | |
473 | semantic_error("Argument parse error: %s", str); | |
474 | ||
475 | tmp = strpbrk(str, "-."); | |
476 | if (tmp) { | |
477 | (*fieldp)->name = xstrndup(str, tmp - str); | |
478 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); | |
479 | fieldp = &(*fieldp)->next; | |
480 | } | |
481 | } while (tmp); | |
482 | (*fieldp)->name = xstrdup(str); | |
483 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); | |
484 | } | |
485 | ||
4235b045 MH |
486 | /* Parse perf-probe event command */ |
487 | void parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) | |
50656eec | 488 | { |
e1c01d61 | 489 | char **argv; |
fac13fd5 MH |
490 | int argc, i; |
491 | ||
4235b045 | 492 | argv = argv_split(cmd, &argc); |
e1c01d61 MH |
493 | if (!argv) |
494 | die("argv_split failed."); | |
495 | if (argc > MAX_PROBE_ARGS + 1) | |
496 | semantic_error("Too many arguments"); | |
50656eec MH |
497 | |
498 | /* Parse probe point */ | |
4235b045 | 499 | parse_perf_probe_point(argv[0], pev); |
50656eec | 500 | |
e1c01d61 | 501 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 MH |
502 | pev->nargs = argc - 1; |
503 | pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs); | |
504 | for (i = 0; i < pev->nargs; i++) { | |
7df2f329 | 505 | parse_perf_probe_arg(argv[i + 1], &pev->args[i]); |
48481938 | 506 | if (is_c_varname(pev->args[i].var) && pev->point.retprobe) |
4235b045 MH |
507 | semantic_error("You can't specify local variable for" |
508 | " kretprobe"); | |
e1c01d61 | 509 | } |
50656eec | 510 | |
e1c01d61 | 511 | argv_free(argv); |
50656eec MH |
512 | } |
513 | ||
4235b045 MH |
514 | /* Return true if this perf_probe_event requires debuginfo */ |
515 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
516 | { | |
517 | int i; | |
518 | ||
519 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
520 | return true; | |
521 | ||
522 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 523 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
524 | return true; |
525 | ||
526 | return false; | |
527 | } | |
528 | ||
4de189fe | 529 | /* Parse kprobe_events event into struct probe_point */ |
4235b045 | 530 | void parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev) |
4de189fe | 531 | { |
4235b045 | 532 | struct kprobe_trace_point *tp = &tev->point; |
4de189fe MH |
533 | char pr; |
534 | char *p; | |
535 | int ret, i, argc; | |
536 | char **argv; | |
537 | ||
4235b045 MH |
538 | pr_debug("Parsing kprobe_events: %s\n", cmd); |
539 | argv = argv_split(cmd, &argc); | |
4de189fe MH |
540 | if (!argv) |
541 | die("argv_split failed."); | |
542 | if (argc < 2) | |
543 | semantic_error("Too less arguments."); | |
544 | ||
545 | /* Scan event and group name. */ | |
93aaa45a | 546 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
547 | &pr, (float *)(void *)&tev->group, |
548 | (float *)(void *)&tev->event); | |
4de189fe MH |
549 | if (ret != 3) |
550 | semantic_error("Failed to parse event name: %s", argv[0]); | |
4235b045 | 551 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 552 | |
4235b045 | 553 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
554 | |
555 | /* Scan function name and offset */ | |
4235b045 MH |
556 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
557 | &tp->offset); | |
4de189fe | 558 | if (ret == 1) |
4235b045 | 559 | tp->offset = 0; |
4de189fe | 560 | |
4235b045 MH |
561 | tev->nargs = argc - 2; |
562 | tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs); | |
563 | for (i = 0; i < tev->nargs; i++) { | |
4de189fe MH |
564 | p = strchr(argv[i + 2], '='); |
565 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
566 | *p++ = '\0'; |
567 | else | |
568 | p = argv[i + 2]; | |
569 | tev->args[i].name = xstrdup(argv[i + 2]); | |
570 | /* TODO: parse regs and offset */ | |
571 | tev->args[i].value = xstrdup(p); | |
4de189fe MH |
572 | } |
573 | ||
4de189fe MH |
574 | argv_free(argv); |
575 | } | |
576 | ||
7df2f329 MH |
577 | /* Compose only probe arg */ |
578 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
579 | { | |
580 | struct perf_probe_arg_field *field = pa->field; | |
581 | int ret; | |
582 | char *tmp = buf; | |
583 | ||
48481938 MH |
584 | if (pa->name && pa->var) |
585 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
586 | else | |
587 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
588 | if (ret <= 0) |
589 | goto error; | |
590 | tmp += ret; | |
591 | len -= ret; | |
592 | ||
593 | while (field) { | |
594 | ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".", | |
595 | field->name); | |
596 | if (ret <= 0) | |
597 | goto error; | |
598 | tmp += ret; | |
599 | len -= ret; | |
600 | field = field->next; | |
601 | } | |
602 | return tmp - buf; | |
603 | error: | |
604 | die("Failed to synthesize perf probe argument: %s", strerror(-ret)); | |
605 | } | |
606 | ||
4235b045 MH |
607 | /* Compose only probe point (not argument) */ |
608 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 609 | { |
fb1587d8 MH |
610 | char *buf, *tmp; |
611 | char offs[32] = "", line[32] = "", file[32] = ""; | |
612 | int ret, len; | |
4de189fe | 613 | |
4235b045 | 614 | buf = xzalloc(MAX_CMDLEN); |
4de189fe | 615 | if (pp->offset) { |
fb1587d8 | 616 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
617 | if (ret <= 0) |
618 | goto error; | |
619 | } | |
620 | if (pp->line) { | |
fb1587d8 MH |
621 | ret = e_snprintf(line, 32, ":%d", pp->line); |
622 | if (ret <= 0) | |
623 | goto error; | |
624 | } | |
625 | if (pp->file) { | |
626 | len = strlen(pp->file) - 32; | |
627 | if (len < 0) | |
628 | len = 0; | |
629 | tmp = strchr(pp->file + len, '/'); | |
630 | if (!tmp) | |
631 | tmp = pp->file + len - 1; | |
632 | ret = e_snprintf(file, 32, "@%s", tmp + 1); | |
4de189fe MH |
633 | if (ret <= 0) |
634 | goto error; | |
635 | } | |
636 | ||
637 | if (pp->function) | |
fb1587d8 MH |
638 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
639 | offs, pp->retprobe ? "%return" : "", line, | |
640 | file); | |
4de189fe | 641 | else |
fb1587d8 | 642 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
643 | if (ret <= 0) |
644 | goto error; | |
645 | ||
646 | return buf; | |
7ef17aaf | 647 | error: |
4235b045 | 648 | die("Failed to synthesize perf probe point: %s", strerror(-ret)); |
7ef17aaf MH |
649 | } |
650 | ||
4235b045 MH |
651 | #if 0 |
652 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
653 | { |
654 | char *buf; | |
655 | int i, len, ret; | |
656 | ||
4235b045 MH |
657 | buf = synthesize_perf_probe_point(&pev->point); |
658 | if (!buf) | |
659 | return NULL; | |
4de189fe | 660 | |
4235b045 MH |
661 | len = strlen(buf); |
662 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 663 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
664 | pev->args[i].name); |
665 | if (ret <= 0) { | |
666 | free(buf); | |
667 | return NULL; | |
668 | } | |
4de189fe MH |
669 | len += ret; |
670 | } | |
4de189fe | 671 | |
4235b045 MH |
672 | return buf; |
673 | } | |
674 | #endif | |
675 | ||
676 | static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref, | |
677 | char **buf, size_t *buflen, | |
678 | int depth) | |
679 | { | |
680 | int ret; | |
681 | if (ref->next) { | |
682 | depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf, | |
683 | buflen, depth + 1); | |
684 | if (depth < 0) | |
685 | goto out; | |
686 | } | |
687 | ||
688 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
689 | if (ret < 0) | |
690 | depth = ret; | |
691 | else { | |
692 | *buf += ret; | |
693 | *buflen -= ret; | |
694 | } | |
695 | out: | |
696 | return depth; | |
4de189fe | 697 | |
4de189fe MH |
698 | } |
699 | ||
4235b045 MH |
700 | static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg, |
701 | char *buf, size_t buflen) | |
50656eec | 702 | { |
4235b045 MH |
703 | int ret, depth = 0; |
704 | char *tmp = buf; | |
705 | ||
706 | /* Argument name or separator */ | |
707 | if (arg->name) | |
708 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
709 | else | |
710 | ret = e_snprintf(buf, buflen, " "); | |
711 | if (ret < 0) | |
712 | return ret; | |
713 | buf += ret; | |
714 | buflen -= ret; | |
715 | ||
716 | /* Dereferencing arguments */ | |
717 | if (arg->ref) { | |
718 | depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf, | |
719 | &buflen, 1); | |
720 | if (depth < 0) | |
721 | return depth; | |
722 | } | |
723 | ||
724 | /* Print argument value */ | |
725 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
726 | if (ret < 0) | |
727 | return ret; | |
728 | buf += ret; | |
729 | buflen -= ret; | |
730 | ||
731 | /* Closing */ | |
732 | while (depth--) { | |
733 | ret = e_snprintf(buf, buflen, ")"); | |
734 | if (ret < 0) | |
735 | return ret; | |
736 | buf += ret; | |
737 | buflen -= ret; | |
738 | } | |
739 | ||
740 | return buf - tmp; | |
741 | } | |
742 | ||
743 | char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev) | |
744 | { | |
745 | struct kprobe_trace_point *tp = &tev->point; | |
50656eec MH |
746 | char *buf; |
747 | int i, len, ret; | |
748 | ||
4235b045 MH |
749 | buf = xzalloc(MAX_CMDLEN); |
750 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", | |
751 | tp->retprobe ? 'r' : 'p', | |
752 | tev->group, tev->event, | |
753 | tp->symbol, tp->offset); | |
754 | if (len <= 0) | |
50656eec | 755 | goto error; |
50656eec | 756 | |
4235b045 MH |
757 | for (i = 0; i < tev->nargs; i++) { |
758 | ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len, | |
759 | MAX_CMDLEN - len); | |
4de189fe | 760 | if (ret <= 0) |
50656eec MH |
761 | goto error; |
762 | len += ret; | |
763 | } | |
50656eec | 764 | |
4235b045 | 765 | return buf; |
50656eec | 766 | error: |
4235b045 MH |
767 | free(buf); |
768 | return NULL; | |
769 | } | |
50656eec | 770 | |
4235b045 MH |
771 | void convert_to_perf_probe_event(struct kprobe_trace_event *tev, |
772 | struct perf_probe_event *pev) | |
773 | { | |
774 | char buf[64]; | |
775 | int i; | |
4235b045 | 776 | |
4b4da7f7 | 777 | /* Convert event/group name */ |
fb1587d8 MH |
778 | pev->event = xstrdup(tev->event); |
779 | pev->group = xstrdup(tev->group); | |
780 | ||
4b4da7f7 MH |
781 | /* Convert trace_point to probe_point */ |
782 | convert_to_perf_probe_point(&tev->point, &pev->point); | |
783 | ||
4235b045 MH |
784 | /* Convert trace_arg to probe_arg */ |
785 | pev->nargs = tev->nargs; | |
786 | pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs); | |
787 | for (i = 0; i < tev->nargs; i++) | |
788 | if (tev->args[i].name) | |
789 | pev->args[i].name = xstrdup(tev->args[i].name); | |
790 | else { | |
791 | synthesize_kprobe_trace_arg(&tev->args[i], buf, 64); | |
792 | pev->args[i].name = xstrdup(buf); | |
793 | } | |
794 | } | |
795 | ||
796 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
797 | { | |
798 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 799 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
800 | int i; |
801 | ||
802 | if (pev->event) | |
803 | free(pev->event); | |
804 | if (pev->group) | |
805 | free(pev->group); | |
806 | if (pp->file) | |
807 | free(pp->file); | |
808 | if (pp->function) | |
809 | free(pp->function); | |
810 | if (pp->lazy_line) | |
811 | free(pp->lazy_line); | |
7df2f329 | 812 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
813 | if (pev->args[i].name) |
814 | free(pev->args[i].name); | |
48481938 MH |
815 | if (pev->args[i].var) |
816 | free(pev->args[i].var); | |
7df2f329 MH |
817 | field = pev->args[i].field; |
818 | while (field) { | |
819 | next = field->next; | |
820 | if (field->name) | |
821 | free(field->name); | |
822 | free(field); | |
823 | field = next; | |
824 | } | |
825 | } | |
4235b045 MH |
826 | if (pev->args) |
827 | free(pev->args); | |
828 | memset(pev, 0, sizeof(*pev)); | |
829 | } | |
830 | ||
831 | void clear_kprobe_trace_event(struct kprobe_trace_event *tev) | |
832 | { | |
833 | struct kprobe_trace_arg_ref *ref, *next; | |
834 | int i; | |
835 | ||
836 | if (tev->event) | |
837 | free(tev->event); | |
838 | if (tev->group) | |
839 | free(tev->group); | |
840 | if (tev->point.symbol) | |
841 | free(tev->point.symbol); | |
842 | for (i = 0; i < tev->nargs; i++) { | |
843 | if (tev->args[i].name) | |
844 | free(tev->args[i].name); | |
845 | if (tev->args[i].value) | |
846 | free(tev->args[i].value); | |
847 | ref = tev->args[i].ref; | |
848 | while (ref) { | |
849 | next = ref->next; | |
850 | free(ref); | |
851 | ref = next; | |
852 | } | |
853 | } | |
854 | if (tev->args) | |
855 | free(tev->args); | |
856 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
857 | } |
858 | ||
f4d7da49 | 859 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
860 | { |
861 | char buf[PATH_MAX]; | |
862 | int ret; | |
863 | ||
864 | ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path); | |
865 | if (ret < 0) | |
866 | die("Failed to make kprobe_events path."); | |
867 | ||
f4d7da49 MH |
868 | if (readwrite && !probe_event_dry_run) |
869 | ret = open(buf, O_RDWR, O_APPEND); | |
870 | else | |
871 | ret = open(buf, O_RDONLY, 0); | |
872 | ||
4de189fe MH |
873 | if (ret < 0) { |
874 | if (errno == ENOENT) | |
875 | die("kprobe_events file does not exist -" | |
63bbd5e2 | 876 | " please rebuild with CONFIG_KPROBE_EVENT."); |
4de189fe MH |
877 | else |
878 | die("Could not open kprobe_events file: %s", | |
879 | strerror(errno)); | |
880 | } | |
881 | return ret; | |
882 | } | |
883 | ||
884 | /* Get raw string list of current kprobe_events */ | |
4235b045 | 885 | static struct strlist *get_kprobe_trace_command_rawlist(int fd) |
4de189fe MH |
886 | { |
887 | int ret, idx; | |
888 | FILE *fp; | |
889 | char buf[MAX_CMDLEN]; | |
890 | char *p; | |
891 | struct strlist *sl; | |
892 | ||
893 | sl = strlist__new(true, NULL); | |
894 | ||
895 | fp = fdopen(dup(fd), "r"); | |
896 | while (!feof(fp)) { | |
897 | p = fgets(buf, MAX_CMDLEN, fp); | |
898 | if (!p) | |
899 | break; | |
900 | ||
901 | idx = strlen(p) - 1; | |
902 | if (p[idx] == '\n') | |
903 | p[idx] = '\0'; | |
904 | ret = strlist__add(sl, buf); | |
905 | if (ret < 0) | |
906 | die("strlist__add failed: %s", strerror(-ret)); | |
907 | } | |
908 | fclose(fp); | |
909 | ||
910 | return sl; | |
911 | } | |
912 | ||
278498d4 | 913 | /* Show an event */ |
4235b045 | 914 | static void show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 915 | { |
7e990a51 | 916 | int i, ret; |
278498d4 | 917 | char buf[128]; |
4235b045 | 918 | char *place; |
278498d4 | 919 | |
4235b045 MH |
920 | /* Synthesize only event probe point */ |
921 | place = synthesize_perf_probe_point(&pev->point); | |
922 | ||
923 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 MH |
924 | if (ret < 0) |
925 | die("Failed to copy event: %s", strerror(-ret)); | |
fb1587d8 | 926 | printf(" %-20s (on %s", buf, place); |
278498d4 | 927 | |
4235b045 | 928 | if (pev->nargs > 0) { |
278498d4 | 929 | printf(" with"); |
7df2f329 MH |
930 | for (i = 0; i < pev->nargs; i++) { |
931 | synthesize_perf_probe_arg(&pev->args[i], buf, 128); | |
932 | printf(" %s", buf); | |
933 | } | |
278498d4 MH |
934 | } |
935 | printf(")\n"); | |
4235b045 | 936 | free(place); |
278498d4 MH |
937 | } |
938 | ||
4de189fe MH |
939 | /* List up current perf-probe events */ |
940 | void show_perf_probe_events(void) | |
941 | { | |
7ef17aaf | 942 | int fd; |
4235b045 MH |
943 | struct kprobe_trace_event tev; |
944 | struct perf_probe_event pev; | |
4de189fe MH |
945 | struct strlist *rawlist; |
946 | struct str_node *ent; | |
947 | ||
72041334 | 948 | setup_pager(); |
fb1587d8 | 949 | init_vmlinux(); |
4235b045 MH |
950 | |
951 | memset(&tev, 0, sizeof(tev)); | |
952 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 953 | |
f4d7da49 | 954 | fd = open_kprobe_events(false); |
4235b045 | 955 | rawlist = get_kprobe_trace_command_rawlist(fd); |
4de189fe MH |
956 | close(fd); |
957 | ||
adf365f4 | 958 | strlist__for_each(ent, rawlist) { |
4235b045 MH |
959 | parse_kprobe_trace_command(ent->s, &tev); |
960 | convert_to_perf_probe_event(&tev, &pev); | |
278498d4 | 961 | /* Show an event */ |
4235b045 MH |
962 | show_perf_probe_event(&pev); |
963 | clear_perf_probe_event(&pev); | |
964 | clear_kprobe_trace_event(&tev); | |
4de189fe MH |
965 | } |
966 | ||
967 | strlist__delete(rawlist); | |
968 | } | |
969 | ||
b498ce1f | 970 | /* Get current perf-probe event names */ |
4235b045 | 971 | static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group) |
b498ce1f | 972 | { |
fa28244d | 973 | char buf[128]; |
b498ce1f MH |
974 | struct strlist *sl, *rawlist; |
975 | struct str_node *ent; | |
4235b045 | 976 | struct kprobe_trace_event tev; |
b498ce1f | 977 | |
4235b045 | 978 | memset(&tev, 0, sizeof(tev)); |
b498ce1f | 979 | |
4235b045 | 980 | rawlist = get_kprobe_trace_command_rawlist(fd); |
e1d2017b | 981 | sl = strlist__new(true, NULL); |
adf365f4 | 982 | strlist__for_each(ent, rawlist) { |
4235b045 | 983 | parse_kprobe_trace_command(ent->s, &tev); |
fa28244d | 984 | if (include_group) { |
4235b045 MH |
985 | if (e_snprintf(buf, 128, "%s:%s", tev.group, |
986 | tev.event) < 0) | |
fa28244d MH |
987 | die("Failed to copy group:event name."); |
988 | strlist__add(sl, buf); | |
989 | } else | |
4235b045 MH |
990 | strlist__add(sl, tev.event); |
991 | clear_kprobe_trace_event(&tev); | |
b498ce1f MH |
992 | } |
993 | ||
994 | strlist__delete(rawlist); | |
995 | ||
996 | return sl; | |
997 | } | |
998 | ||
4235b045 | 999 | static void write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev) |
50656eec MH |
1000 | { |
1001 | int ret; | |
4235b045 | 1002 | char *buf = synthesize_kprobe_trace_command(tev); |
50656eec | 1003 | |
fa28244d | 1004 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1005 | if (!probe_event_dry_run) { |
1006 | ret = write(fd, buf, strlen(buf)); | |
1007 | if (ret <= 0) | |
1008 | die("Failed to write event: %s", strerror(errno)); | |
1009 | } | |
4235b045 | 1010 | free(buf); |
50656eec MH |
1011 | } |
1012 | ||
b498ce1f | 1013 | static void get_new_event_name(char *buf, size_t len, const char *base, |
d761b08b | 1014 | struct strlist *namelist, bool allow_suffix) |
b498ce1f MH |
1015 | { |
1016 | int i, ret; | |
17f88fcd MH |
1017 | |
1018 | /* Try no suffix */ | |
1019 | ret = e_snprintf(buf, len, "%s", base); | |
1020 | if (ret < 0) | |
1021 | die("snprintf() failed: %s", strerror(-ret)); | |
1022 | if (!strlist__has_entry(namelist, buf)) | |
1023 | return; | |
1024 | ||
d761b08b MH |
1025 | if (!allow_suffix) { |
1026 | pr_warning("Error: event \"%s\" already exists. " | |
1027 | "(Use -f to force duplicates.)\n", base); | |
1028 | die("Can't add new event."); | |
1029 | } | |
1030 | ||
17f88fcd MH |
1031 | /* Try to add suffix */ |
1032 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f MH |
1033 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
1034 | if (ret < 0) | |
1035 | die("snprintf() failed: %s", strerror(-ret)); | |
1036 | if (!strlist__has_entry(namelist, buf)) | |
1037 | break; | |
1038 | } | |
1039 | if (i == MAX_EVENT_INDEX) | |
1040 | die("Too many events are on the same function."); | |
1041 | } | |
1042 | ||
4235b045 MH |
1043 | static void __add_kprobe_trace_events(struct perf_probe_event *pev, |
1044 | struct kprobe_trace_event *tevs, | |
1045 | int ntevs, bool allow_suffix) | |
50656eec | 1046 | { |
4235b045 | 1047 | int i, fd; |
55632770 | 1048 | struct kprobe_trace_event *tev = NULL; |
4235b045 MH |
1049 | char buf[64]; |
1050 | const char *event, *group; | |
b498ce1f | 1051 | struct strlist *namelist; |
50656eec | 1052 | |
f4d7da49 | 1053 | fd = open_kprobe_events(true); |
b498ce1f | 1054 | /* Get current event names */ |
4235b045 MH |
1055 | namelist = get_kprobe_trace_event_names(fd, false); |
1056 | ||
1057 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); | |
1058 | for (i = 0; i < ntevs; i++) { | |
1059 | tev = &tevs[i]; | |
1060 | if (pev->event) | |
1061 | event = pev->event; | |
1062 | else | |
1063 | if (pev->point.function) | |
1064 | event = pev->point.function; | |
1065 | else | |
1066 | event = tev->point.symbol; | |
1067 | if (pev->group) | |
1068 | group = pev->group; | |
1069 | else | |
1070 | group = PERFPROBE_GROUP; | |
1071 | ||
1072 | /* Get an unused new event name */ | |
1073 | get_new_event_name(buf, 64, event, namelist, allow_suffix); | |
1074 | event = buf; | |
1075 | ||
1076 | tev->event = xstrdup(event); | |
1077 | tev->group = xstrdup(group); | |
1078 | write_kprobe_trace_event(fd, tev); | |
1079 | /* Add added event name to namelist */ | |
1080 | strlist__add(namelist, event); | |
1081 | ||
1082 | /* Trick here - save current event/group */ | |
1083 | event = pev->event; | |
1084 | group = pev->group; | |
1085 | pev->event = tev->event; | |
1086 | pev->group = tev->group; | |
1087 | show_perf_probe_event(pev); | |
1088 | /* Trick here - restore current event/group */ | |
1089 | pev->event = (char *)event; | |
1090 | pev->group = (char *)group; | |
1091 | ||
1092 | /* | |
1093 | * Probes after the first probe which comes from same | |
1094 | * user input are always allowed to add suffix, because | |
1095 | * there might be several addresses corresponding to | |
1096 | * one code line. | |
1097 | */ | |
1098 | allow_suffix = true; | |
50656eec | 1099 | } |
a9b495b0 MH |
1100 | /* Show how to use the event. */ |
1101 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
4235b045 | 1102 | printf("\tperf record -e %s:%s -a sleep 1\n\n", tev->group, tev->event); |
a9b495b0 | 1103 | |
e1d2017b | 1104 | strlist__delete(namelist); |
50656eec MH |
1105 | close(fd); |
1106 | } | |
fa28244d | 1107 | |
4235b045 MH |
1108 | static int convert_to_kprobe_trace_events(struct perf_probe_event *pev, |
1109 | struct kprobe_trace_event **tevs) | |
e0faa8d3 MH |
1110 | { |
1111 | struct symbol *sym; | |
4235b045 MH |
1112 | int ntevs = 0, i; |
1113 | struct kprobe_trace_event *tev; | |
1114 | ||
4b4da7f7 MH |
1115 | /* Convert perf_probe_event with debuginfo */ |
1116 | ntevs = try_to_find_kprobe_trace_events(pev, tevs); | |
1117 | if (ntevs > 0) | |
1118 | return ntevs; | |
e0faa8d3 | 1119 | |
4235b045 MH |
1120 | /* Allocate trace event buffer */ |
1121 | ntevs = 1; | |
1122 | tev = *tevs = xzalloc(sizeof(struct kprobe_trace_event)); | |
1123 | ||
1124 | /* Copy parameters */ | |
1125 | tev->point.symbol = xstrdup(pev->point.function); | |
1126 | tev->point.offset = pev->point.offset; | |
1127 | tev->nargs = pev->nargs; | |
1128 | if (tev->nargs) { | |
1129 | tev->args = xzalloc(sizeof(struct kprobe_trace_arg) | |
1130 | * tev->nargs); | |
48481938 MH |
1131 | for (i = 0; i < tev->nargs; i++) { |
1132 | if (pev->args[i].name) | |
1133 | tev->args[i].name = xstrdup(pev->args[i].name); | |
1134 | tev->args[i].value = xstrdup(pev->args[i].var); | |
1135 | } | |
4235b045 MH |
1136 | } |
1137 | ||
1138 | /* Currently just checking function name from symbol map */ | |
1139 | sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION], | |
1140 | tev->point.symbol, NULL); | |
1141 | if (!sym) | |
1142 | die("Kernel symbol \'%s\' not found - probe not added.", | |
1143 | tev->point.symbol); | |
4b4da7f7 | 1144 | |
4235b045 MH |
1145 | return ntevs; |
1146 | } | |
1147 | ||
1148 | struct __event_package { | |
1149 | struct perf_probe_event *pev; | |
1150 | struct kprobe_trace_event *tevs; | |
1151 | int ntevs; | |
1152 | }; | |
1153 | ||
1154 | void add_perf_probe_events(struct perf_probe_event *pevs, int npevs, | |
1155 | bool force_add) | |
1156 | { | |
1157 | int i; | |
1158 | struct __event_package *pkgs; | |
1159 | ||
1160 | pkgs = xzalloc(sizeof(struct __event_package) * npevs); | |
1161 | ||
1162 | /* Init vmlinux path */ | |
1163 | init_vmlinux(); | |
1164 | ||
1165 | /* Loop 1: convert all events */ | |
1166 | for (i = 0; i < npevs; i++) { | |
1167 | pkgs[i].pev = &pevs[i]; | |
1168 | /* Convert with or without debuginfo */ | |
1169 | pkgs[i].ntevs = convert_to_kprobe_trace_events(pkgs[i].pev, | |
1170 | &pkgs[i].tevs); | |
e0faa8d3 MH |
1171 | } |
1172 | ||
4235b045 MH |
1173 | /* Loop 2: add all events */ |
1174 | for (i = 0; i < npevs; i++) | |
1175 | __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs, | |
1176 | pkgs[i].ntevs, force_add); | |
1177 | /* TODO: cleanup all trace events? */ | |
e0faa8d3 MH |
1178 | } |
1179 | ||
bbbb521b MH |
1180 | static void __del_trace_kprobe_event(int fd, struct str_node *ent) |
1181 | { | |
1182 | char *p; | |
1183 | char buf[128]; | |
4235b045 | 1184 | int ret; |
bbbb521b MH |
1185 | |
1186 | /* Convert from perf-probe event to trace-kprobe event */ | |
1187 | if (e_snprintf(buf, 128, "-:%s", ent->s) < 0) | |
1188 | die("Failed to copy event."); | |
1189 | p = strchr(buf + 2, ':'); | |
1190 | if (!p) | |
1191 | die("Internal error: %s should have ':' but not.", ent->s); | |
1192 | *p = '/'; | |
1193 | ||
4235b045 MH |
1194 | pr_debug("Writing event: %s\n", buf); |
1195 | ret = write(fd, buf, strlen(buf)); | |
1196 | if (ret <= 0) | |
1197 | die("Failed to write event: %s", strerror(errno)); | |
bbbb521b MH |
1198 | printf("Remove event: %s\n", ent->s); |
1199 | } | |
1200 | ||
fa28244d MH |
1201 | static void del_trace_kprobe_event(int fd, const char *group, |
1202 | const char *event, struct strlist *namelist) | |
1203 | { | |
1204 | char buf[128]; | |
bbbb521b MH |
1205 | struct str_node *ent, *n; |
1206 | int found = 0; | |
fa28244d MH |
1207 | |
1208 | if (e_snprintf(buf, 128, "%s:%s", group, event) < 0) | |
1209 | die("Failed to copy event."); | |
fa28244d | 1210 | |
bbbb521b MH |
1211 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1212 | strlist__for_each_safe(ent, n, namelist) | |
1213 | if (strglobmatch(ent->s, buf)) { | |
1214 | found++; | |
1215 | __del_trace_kprobe_event(fd, ent); | |
1216 | strlist__remove(namelist, ent); | |
1217 | } | |
1218 | } else { | |
1219 | ent = strlist__find(namelist, buf); | |
1220 | if (ent) { | |
1221 | found++; | |
1222 | __del_trace_kprobe_event(fd, ent); | |
1223 | strlist__remove(namelist, ent); | |
1224 | } | |
1225 | } | |
1226 | if (found == 0) | |
1227 | pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf); | |
fa28244d MH |
1228 | } |
1229 | ||
4235b045 | 1230 | void del_perf_probe_events(struct strlist *dellist) |
fa28244d MH |
1231 | { |
1232 | int fd; | |
fa28244d MH |
1233 | const char *group, *event; |
1234 | char *p, *str; | |
1235 | struct str_node *ent; | |
1236 | struct strlist *namelist; | |
1237 | ||
f4d7da49 | 1238 | fd = open_kprobe_events(true); |
fa28244d | 1239 | /* Get current event names */ |
4235b045 | 1240 | namelist = get_kprobe_trace_event_names(fd, true); |
fa28244d | 1241 | |
adf365f4 | 1242 | strlist__for_each(ent, dellist) { |
31facc5f | 1243 | str = xstrdup(ent->s); |
bbbb521b | 1244 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1245 | p = strchr(str, ':'); |
1246 | if (p) { | |
1247 | group = str; | |
1248 | *p = '\0'; | |
1249 | event = p + 1; | |
1250 | } else { | |
bbbb521b | 1251 | group = "*"; |
fa28244d MH |
1252 | event = str; |
1253 | } | |
bbbb521b | 1254 | pr_debug("Group: %s, Event: %s\n", group, event); |
fa28244d MH |
1255 | del_trace_kprobe_event(fd, group, event, namelist); |
1256 | free(str); | |
1257 | } | |
1258 | strlist__delete(namelist); | |
1259 | close(fd); | |
1260 | } | |
1261 |