Commit | Line | Data |
---|---|---|
50656eec | 1 | /* |
0e60836b | 2 | * probe-event.c : perf-probe definition to probe_events format converter |
50656eec MH |
3 | * |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
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> | |
e80711ca | 34 | #include <elf.h> |
50656eec MH |
35 | |
36 | #undef _GNU_SOURCE | |
31facc5f | 37 | #include "util.h" |
50656eec | 38 | #include "event.h" |
e1c01d61 | 39 | #include "string.h" |
4de189fe | 40 | #include "strlist.h" |
50656eec | 41 | #include "debug.h" |
72041334 | 42 | #include "cache.h" |
631c9def | 43 | #include "color.h" |
e0faa8d3 MH |
44 | #include "symbol.h" |
45 | #include "thread.h" | |
7ca5989d | 46 | #include "debugfs.h" |
4b4da7f7 | 47 | #include "trace-event.h" /* For __unused */ |
50656eec | 48 | #include "probe-event.h" |
4235b045 | 49 | #include "probe-finder.h" |
50656eec MH |
50 | |
51 | #define MAX_CMDLEN 256 | |
52 | #define MAX_PROBE_ARGS 128 | |
53 | #define PERFPROBE_GROUP "probe" | |
54 | ||
f4d7da49 MH |
55 | bool probe_event_dry_run; /* Dry run flag */ |
56 | ||
146a1439 | 57 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 58 | |
4de189fe | 59 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
60 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
61 | __attribute__((format(printf, 3, 4))); | |
62 | ||
4de189fe MH |
63 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
64 | { | |
65 | int ret; | |
66 | va_list ap; | |
67 | va_start(ap, format); | |
68 | ret = vsnprintf(str, size, format, ap); | |
69 | va_end(ap); | |
70 | if (ret >= (int)size) | |
71 | ret = -E2BIG; | |
72 | return ret; | |
73 | } | |
74 | ||
4b4da7f7 | 75 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp); |
d28c6223 | 76 | static struct machine machine; |
e0faa8d3 | 77 | |
469b9b88 | 78 | /* Initialize symbol maps and path of vmlinux/modules */ |
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 | 93 | |
469b9b88 | 94 | ret = machine__init(&machine, "", HOST_KERNEL_ID); |
d28c6223 ACM |
95 | if (ret < 0) |
96 | goto out; | |
97 | ||
469b9b88 | 98 | if (machine__create_kernel_maps(&machine) < 0) { |
0e43e5d2 | 99 | pr_debug("machine__create_kernel_maps() failed.\n"); |
469b9b88 MH |
100 | goto out; |
101 | } | |
146a1439 MH |
102 | out: |
103 | if (ret < 0) | |
104 | pr_warning("Failed to init vmlinux path.\n"); | |
105 | return ret; | |
e0faa8d3 MH |
106 | } |
107 | ||
469b9b88 MH |
108 | static struct symbol *__find_kernel_function_by_name(const char *name, |
109 | struct map **mapp) | |
110 | { | |
111 | return machine__find_kernel_function_by_name(&machine, name, mapp, | |
112 | NULL); | |
113 | } | |
114 | ||
e80711ca MH |
115 | static struct map *kernel_get_module_map(const char *module) |
116 | { | |
117 | struct rb_node *nd; | |
118 | struct map_groups *grp = &machine.kmaps; | |
119 | ||
120 | if (!module) | |
121 | module = "kernel"; | |
122 | ||
123 | for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) { | |
124 | struct map *pos = rb_entry(nd, struct map, rb_node); | |
125 | if (strncmp(pos->dso->short_name + 1, module, | |
126 | pos->dso->short_name_len - 2) == 0) { | |
127 | return pos; | |
128 | } | |
129 | } | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | static struct dso *kernel_get_module_dso(const char *module) | |
469b9b88 MH |
134 | { |
135 | struct dso *dso; | |
fd930ff9 FBH |
136 | struct map *map; |
137 | const char *vmlinux_name; | |
469b9b88 MH |
138 | |
139 | if (module) { | |
140 | list_for_each_entry(dso, &machine.kernel_dsos, node) { | |
141 | if (strncmp(dso->short_name + 1, module, | |
142 | dso->short_name_len - 2) == 0) | |
143 | goto found; | |
144 | } | |
145 | pr_debug("Failed to find module %s.\n", module); | |
146 | return NULL; | |
fd930ff9 FBH |
147 | } |
148 | ||
149 | map = machine.vmlinux_maps[MAP__FUNCTION]; | |
150 | dso = map->dso; | |
151 | ||
152 | vmlinux_name = symbol_conf.vmlinux_name; | |
153 | if (vmlinux_name) { | |
154 | if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0) | |
155 | return NULL; | |
469b9b88 | 156 | } else { |
c3a34e06 | 157 | if (dso__load_vmlinux_path(dso, map, NULL) <= 0) { |
469b9b88 MH |
158 | pr_debug("Failed to load kernel map.\n"); |
159 | return NULL; | |
160 | } | |
161 | } | |
162 | found: | |
e80711ca MH |
163 | return dso; |
164 | } | |
165 | ||
166 | const char *kernel_get_module_path(const char *module) | |
167 | { | |
168 | struct dso *dso = kernel_get_module_dso(module); | |
169 | return (dso) ? dso->long_name : NULL; | |
469b9b88 MH |
170 | } |
171 | ||
4b4da7f7 | 172 | #ifdef DWARF_SUPPORT |
469b9b88 | 173 | static int open_vmlinux(const char *module) |
e0faa8d3 | 174 | { |
469b9b88 MH |
175 | const char *path = kernel_get_module_path(module); |
176 | if (!path) { | |
0e43e5d2 MH |
177 | pr_err("Failed to find path of %s module.\n", |
178 | module ?: "kernel"); | |
469b9b88 | 179 | return -ENOENT; |
e0faa8d3 | 180 | } |
469b9b88 MH |
181 | pr_debug("Try to open %s\n", path); |
182 | return open(path, O_RDONLY); | |
e0faa8d3 | 183 | } |
4b4da7f7 | 184 | |
0e60836b SD |
185 | /* |
186 | * Convert trace point to probe point with debuginfo | |
187 | * Currently only handles kprobes. | |
188 | */ | |
189 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, | |
469b9b88 | 190 | struct perf_probe_point *pp) |
4b4da7f7 MH |
191 | { |
192 | struct symbol *sym; | |
469b9b88 MH |
193 | struct map *map; |
194 | u64 addr; | |
195 | int ret = -ENOENT; | |
4b4da7f7 | 196 | |
469b9b88 | 197 | sym = __find_kernel_function_by_name(tp->symbol, &map); |
4b4da7f7 | 198 | if (sym) { |
469b9b88 | 199 | addr = map->unmap_ip(map, sym->start + tp->offset); |
9486aa38 | 200 | pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol, |
469b9b88 MH |
201 | tp->offset, addr); |
202 | ret = find_perf_probe_point((unsigned long)addr, pp); | |
4b4da7f7 MH |
203 | } |
204 | if (ret <= 0) { | |
146a1439 MH |
205 | pr_debug("Failed to find corresponding probes from " |
206 | "debuginfo. Use kprobe event information.\n"); | |
02b95dad MH |
207 | pp->function = strdup(tp->symbol); |
208 | if (pp->function == NULL) | |
209 | return -ENOMEM; | |
4b4da7f7 MH |
210 | pp->offset = tp->offset; |
211 | } | |
212 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
213 | |
214 | return 0; | |
4b4da7f7 MH |
215 | } |
216 | ||
217 | /* Try to find perf_probe_event with debuginfo */ | |
0e60836b SD |
218 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
219 | struct probe_trace_event **tevs, | |
469b9b88 | 220 | int max_tevs, const char *module) |
4b4da7f7 MH |
221 | { |
222 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
223 | int fd, ntevs; | |
224 | ||
469b9b88 | 225 | fd = open_vmlinux(module); |
4b4da7f7 | 226 | if (fd < 0) { |
146a1439 MH |
227 | if (need_dwarf) { |
228 | pr_warning("Failed to open debuginfo file.\n"); | |
229 | return fd; | |
230 | } | |
4b4da7f7 MH |
231 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* Searching trace events corresponding to probe event */ | |
0e60836b | 236 | ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs); |
4b4da7f7 MH |
237 | close(fd); |
238 | ||
146a1439 | 239 | if (ntevs > 0) { /* Succeeded to find trace events */ |
0e60836b | 240 | pr_debug("find %d probe_trace_events.\n", ntevs); |
4b4da7f7 | 241 | return ntevs; |
146a1439 | 242 | } |
4b4da7f7 | 243 | |
146a1439 MH |
244 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
245 | pr_warning("Probe point '%s' not found.\n", | |
246 | synthesize_perf_probe_point(&pev->point)); | |
247 | return -ENOENT; | |
248 | } | |
249 | /* Error path : ntevs < 0 */ | |
15eca306 MH |
250 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
251 | if (ntevs == -EBADF) { | |
252 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
253 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
254 | if (!need_dwarf) { | |
0e43e5d2 | 255 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
256 | return 0; |
257 | } | |
4b4da7f7 | 258 | } |
15eca306 | 259 | return ntevs; |
4b4da7f7 MH |
260 | } |
261 | ||
7cf0b79e MH |
262 | /* |
263 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
264 | * and chop off leading directories that do not exist. Result is passed back as | |
265 | * a newly allocated path on success. | |
266 | * Return 0 if file was found and readable, -errno otherwise. | |
267 | */ | |
6a330a3c MH |
268 | static int get_real_path(const char *raw_path, const char *comp_dir, |
269 | char **new_path) | |
7cf0b79e | 270 | { |
6a330a3c MH |
271 | const char *prefix = symbol_conf.source_prefix; |
272 | ||
273 | if (!prefix) { | |
274 | if (raw_path[0] != '/' && comp_dir) | |
275 | /* If not an absolute path, try to use comp_dir */ | |
276 | prefix = comp_dir; | |
277 | else { | |
278 | if (access(raw_path, R_OK) == 0) { | |
279 | *new_path = strdup(raw_path); | |
280 | return 0; | |
281 | } else | |
282 | return -errno; | |
283 | } | |
7cf0b79e MH |
284 | } |
285 | ||
6a330a3c | 286 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); |
7cf0b79e MH |
287 | if (!*new_path) |
288 | return -ENOMEM; | |
289 | ||
290 | for (;;) { | |
6a330a3c | 291 | sprintf(*new_path, "%s/%s", prefix, raw_path); |
7cf0b79e MH |
292 | |
293 | if (access(*new_path, R_OK) == 0) | |
294 | return 0; | |
295 | ||
6a330a3c MH |
296 | if (!symbol_conf.source_prefix) |
297 | /* In case of searching comp_dir, don't retry */ | |
298 | return -errno; | |
299 | ||
7cf0b79e MH |
300 | switch (errno) { |
301 | case ENAMETOOLONG: | |
302 | case ENOENT: | |
303 | case EROFS: | |
304 | case EFAULT: | |
305 | raw_path = strchr(++raw_path, '/'); | |
306 | if (!raw_path) { | |
307 | free(*new_path); | |
308 | *new_path = NULL; | |
309 | return -ENOENT; | |
310 | } | |
311 | continue; | |
312 | ||
313 | default: | |
314 | free(*new_path); | |
315 | *new_path = NULL; | |
316 | return -errno; | |
317 | } | |
318 | } | |
319 | } | |
320 | ||
4b4da7f7 MH |
321 | #define LINEBUF_SIZE 256 |
322 | #define NR_ADDITIONAL_LINES 2 | |
323 | ||
fde52dbd | 324 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 MH |
325 | { |
326 | char buf[LINEBUF_SIZE]; | |
befe3414 FBH |
327 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
328 | const char *prefix = NULL; | |
4b4da7f7 | 329 | |
befe3414 | 330 | do { |
4b4da7f7 MH |
331 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
332 | goto error; | |
befe3414 FBH |
333 | if (skip) |
334 | continue; | |
335 | if (!prefix) { | |
336 | prefix = show_num ? "%7d " : " "; | |
337 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 338 | } |
befe3414 FBH |
339 | color_fprintf(stdout, color, "%s", buf); |
340 | ||
341 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 342 | |
fde52dbd | 343 | return 1; |
4b4da7f7 | 344 | error: |
fde52dbd | 345 | if (ferror(fp)) { |
32b2b6ec | 346 | pr_warning("File read error: %s\n", strerror(errno)); |
fde52dbd FBH |
347 | return -1; |
348 | } | |
349 | return 0; | |
350 | } | |
146a1439 | 351 | |
fde52dbd FBH |
352 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
353 | { | |
354 | int rv = __show_one_line(fp, l, skip, show_num); | |
355 | if (rv == 0) { | |
356 | pr_warning("Source file is shorter than expected.\n"); | |
357 | rv = -1; | |
358 | } | |
359 | return rv; | |
4b4da7f7 MH |
360 | } |
361 | ||
fde52dbd FBH |
362 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
363 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
364 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
365 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
366 | ||
4b4da7f7 MH |
367 | /* |
368 | * Show line-range always requires debuginfo to find source file and | |
369 | * line number. | |
370 | */ | |
469b9b88 | 371 | int show_line_range(struct line_range *lr, const char *module) |
4b4da7f7 | 372 | { |
d3b63d7a | 373 | int l = 1; |
4b4da7f7 MH |
374 | struct line_node *ln; |
375 | FILE *fp; | |
376 | int fd, ret; | |
7cf0b79e | 377 | char *tmp; |
4b4da7f7 MH |
378 | |
379 | /* Search a line range */ | |
146a1439 MH |
380 | ret = init_vmlinux(); |
381 | if (ret < 0) | |
382 | return ret; | |
383 | ||
469b9b88 | 384 | fd = open_vmlinux(module); |
146a1439 MH |
385 | if (fd < 0) { |
386 | pr_warning("Failed to open debuginfo file.\n"); | |
387 | return fd; | |
388 | } | |
389 | ||
4b4da7f7 | 390 | ret = find_line_range(fd, lr); |
4b4da7f7 | 391 | close(fd); |
146a1439 MH |
392 | if (ret == 0) { |
393 | pr_warning("Specified source line is not found.\n"); | |
394 | return -ENOENT; | |
395 | } else if (ret < 0) { | |
396 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); | |
397 | return ret; | |
398 | } | |
4b4da7f7 | 399 | |
7cf0b79e MH |
400 | /* Convert source file path */ |
401 | tmp = lr->path; | |
6a330a3c | 402 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
7cf0b79e MH |
403 | free(tmp); /* Free old path */ |
404 | if (ret < 0) { | |
405 | pr_warning("Failed to find source file. (%d)\n", ret); | |
406 | return ret; | |
407 | } | |
408 | ||
4b4da7f7 MH |
409 | setup_pager(); |
410 | ||
411 | if (lr->function) | |
412 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
413 | lr->start - lr->offset); | |
414 | else | |
62c15fc4 | 415 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
416 | |
417 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
418 | if (fp == NULL) { |
419 | pr_warning("Failed to open %s: %s\n", lr->path, | |
420 | strerror(errno)); | |
421 | return -errno; | |
422 | } | |
4b4da7f7 | 423 | /* Skip to starting line number */ |
44b81e92 | 424 | while (l < lr->start) { |
fde52dbd | 425 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
426 | if (ret < 0) |
427 | goto end; | |
428 | } | |
4b4da7f7 MH |
429 | |
430 | list_for_each_entry(ln, &lr->line_list, list) { | |
44b81e92 | 431 | for (; ln->line > l; l++) { |
fde52dbd | 432 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
433 | if (ret < 0) |
434 | goto end; | |
435 | } | |
fde52dbd | 436 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
437 | if (ret < 0) |
438 | goto end; | |
4b4da7f7 MH |
439 | } |
440 | ||
441 | if (lr->end == INT_MAX) | |
442 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
443 | while (l <= lr->end) { |
444 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
445 | if (ret <= 0) | |
44b81e92 FBH |
446 | break; |
447 | } | |
146a1439 | 448 | end: |
4b4da7f7 | 449 | fclose(fp); |
146a1439 | 450 | return ret; |
4b4da7f7 MH |
451 | } |
452 | ||
cf6eb489 | 453 | static int show_available_vars_at(int fd, struct perf_probe_event *pev, |
bd09d7b5 MH |
454 | int max_vls, struct strfilter *_filter, |
455 | bool externs) | |
cf6eb489 MH |
456 | { |
457 | char *buf; | |
bd09d7b5 | 458 | int ret, i, nvars; |
cf6eb489 MH |
459 | struct str_node *node; |
460 | struct variable_list *vls = NULL, *vl; | |
bd09d7b5 | 461 | const char *var; |
cf6eb489 MH |
462 | |
463 | buf = synthesize_perf_probe_point(&pev->point); | |
464 | if (!buf) | |
465 | return -EINVAL; | |
466 | pr_debug("Searching variables at %s\n", buf); | |
467 | ||
fb8c5a56 | 468 | ret = find_available_vars_at(fd, pev, &vls, max_vls, externs); |
bd09d7b5 MH |
469 | if (ret <= 0) { |
470 | pr_err("Failed to find variables at %s (%d)\n", buf, ret); | |
471 | goto end; | |
472 | } | |
473 | /* Some variables are found */ | |
474 | fprintf(stdout, "Available variables at %s\n", buf); | |
475 | for (i = 0; i < ret; i++) { | |
476 | vl = &vls[i]; | |
477 | /* | |
478 | * A probe point might be converted to | |
479 | * several trace points. | |
480 | */ | |
481 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
482 | vl->point.offset); | |
483 | free(vl->point.symbol); | |
484 | nvars = 0; | |
485 | if (vl->vars) { | |
486 | strlist__for_each(node, vl->vars) { | |
487 | var = strchr(node->s, '\t') + 1; | |
488 | if (strfilter__compare(_filter, var)) { | |
cf6eb489 | 489 | fprintf(stdout, "\t\t%s\n", node->s); |
bd09d7b5 MH |
490 | nvars++; |
491 | } | |
492 | } | |
493 | strlist__delete(vl->vars); | |
cf6eb489 | 494 | } |
bd09d7b5 MH |
495 | if (nvars == 0) |
496 | fprintf(stdout, "\t\t(No matched variables)\n"); | |
497 | } | |
498 | free(vls); | |
499 | end: | |
cf6eb489 MH |
500 | free(buf); |
501 | return ret; | |
502 | } | |
503 | ||
504 | /* Show available variables on given probe point */ | |
505 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
bd09d7b5 MH |
506 | int max_vls, const char *module, |
507 | struct strfilter *_filter, bool externs) | |
cf6eb489 MH |
508 | { |
509 | int i, fd, ret = 0; | |
510 | ||
511 | ret = init_vmlinux(); | |
512 | if (ret < 0) | |
513 | return ret; | |
514 | ||
469b9b88 | 515 | fd = open_vmlinux(module); |
cf6eb489 | 516 | if (fd < 0) { |
0e43e5d2 | 517 | pr_warning("Failed to open debug information file.\n"); |
cf6eb489 MH |
518 | return fd; |
519 | } | |
520 | ||
521 | setup_pager(); | |
522 | ||
523 | for (i = 0; i < npevs && ret >= 0; i++) | |
bd09d7b5 MH |
524 | ret = show_available_vars_at(fd, &pevs[i], max_vls, _filter, |
525 | externs); | |
cf6eb489 MH |
526 | |
527 | close(fd); | |
528 | return ret; | |
529 | } | |
530 | ||
4b4da7f7 MH |
531 | #else /* !DWARF_SUPPORT */ |
532 | ||
0e60836b | 533 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, |
469b9b88 | 534 | struct perf_probe_point *pp) |
4b4da7f7 | 535 | { |
469b9b88 MH |
536 | struct symbol *sym; |
537 | ||
538 | sym = __find_kernel_function_by_name(tp->symbol, NULL); | |
539 | if (!sym) { | |
540 | pr_err("Failed to find symbol %s in kernel.\n", tp->symbol); | |
541 | return -ENOENT; | |
542 | } | |
02b95dad MH |
543 | pp->function = strdup(tp->symbol); |
544 | if (pp->function == NULL) | |
545 | return -ENOMEM; | |
4b4da7f7 MH |
546 | pp->offset = tp->offset; |
547 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
548 | |
549 | return 0; | |
4b4da7f7 MH |
550 | } |
551 | ||
0e60836b SD |
552 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
553 | struct probe_trace_event **tevs __unused, | |
469b9b88 | 554 | int max_tevs __unused, const char *mod __unused) |
4b4da7f7 | 555 | { |
146a1439 MH |
556 | if (perf_probe_event_need_dwarf(pev)) { |
557 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
558 | return -ENOSYS; | |
559 | } | |
4b4da7f7 MH |
560 | return 0; |
561 | } | |
562 | ||
469b9b88 | 563 | int show_line_range(struct line_range *lr __unused, const char *module __unused) |
4b4da7f7 | 564 | { |
146a1439 MH |
565 | pr_warning("Debuginfo-analysis is not supported.\n"); |
566 | return -ENOSYS; | |
4b4da7f7 MH |
567 | } |
568 | ||
cf6eb489 | 569 | int show_available_vars(struct perf_probe_event *pevs __unused, |
469b9b88 | 570 | int npevs __unused, int max_vls __unused, |
bd09d7b5 MH |
571 | const char *module __unused, |
572 | struct strfilter *filter __unused, | |
573 | bool externs __unused) | |
cf6eb489 MH |
574 | { |
575 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
576 | return -ENOSYS; | |
577 | } | |
e0faa8d3 MH |
578 | #endif |
579 | ||
21dd9ae5 FBH |
580 | static int parse_line_num(char **ptr, int *val, const char *what) |
581 | { | |
582 | const char *start = *ptr; | |
583 | ||
584 | errno = 0; | |
585 | *val = strtol(*ptr, ptr, 0); | |
586 | if (errno || *ptr == start) { | |
587 | semantic_error("'%s' is not a valid number.\n", what); | |
588 | return -EINVAL; | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | ||
9d95b580 FBH |
593 | /* |
594 | * Stuff 'lr' according to the line range described by 'arg'. | |
595 | * The line range syntax is described by: | |
596 | * | |
597 | * SRC[:SLN[+NUM|-ELN]] | |
e116dfa1 | 598 | * FNC[@SRC][:SLN[+NUM|-ELN]] |
9d95b580 | 599 | */ |
146a1439 | 600 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 601 | { |
e116dfa1 | 602 | char *range, *file, *name = strdup(arg); |
21dd9ae5 FBH |
603 | int err; |
604 | ||
605 | if (!name) | |
606 | return -ENOMEM; | |
607 | ||
608 | lr->start = 0; | |
609 | lr->end = INT_MAX; | |
610 | ||
611 | range = strchr(name, ':'); | |
612 | if (range) { | |
613 | *range++ = '\0'; | |
614 | ||
615 | err = parse_line_num(&range, &lr->start, "start line"); | |
616 | if (err) | |
617 | goto err; | |
618 | ||
619 | if (*range == '+' || *range == '-') { | |
620 | const char c = *range++; | |
621 | ||
622 | err = parse_line_num(&range, &lr->end, "end line"); | |
623 | if (err) | |
624 | goto err; | |
625 | ||
626 | if (c == '+') { | |
627 | lr->end += lr->start; | |
628 | /* | |
629 | * Adjust the number of lines here. | |
630 | * If the number of lines == 1, the | |
631 | * the end of line should be equal to | |
632 | * the start of line. | |
633 | */ | |
634 | lr->end--; | |
635 | } | |
636 | } | |
9d95b580 | 637 | |
d3b63d7a | 638 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
639 | |
640 | err = -EINVAL; | |
d3b63d7a | 641 | if (lr->start > lr->end) { |
631c9def | 642 | semantic_error("Start line must be smaller" |
146a1439 | 643 | " than end line.\n"); |
21dd9ae5 | 644 | goto err; |
146a1439 | 645 | } |
21dd9ae5 FBH |
646 | if (*range != '\0') { |
647 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
648 | goto err; | |
146a1439 | 649 | } |
d3b63d7a | 650 | } |
02b95dad | 651 | |
e116dfa1 MH |
652 | file = strchr(name, '@'); |
653 | if (file) { | |
654 | *file = '\0'; | |
655 | lr->file = strdup(++file); | |
656 | if (lr->file == NULL) { | |
657 | err = -ENOMEM; | |
658 | goto err; | |
659 | } | |
660 | lr->function = name; | |
661 | } else if (strchr(name, '.')) | |
21dd9ae5 | 662 | lr->file = name; |
631c9def | 663 | else |
21dd9ae5 | 664 | lr->function = name; |
146a1439 MH |
665 | |
666 | return 0; | |
21dd9ae5 FBH |
667 | err: |
668 | free(name); | |
669 | return err; | |
631c9def MH |
670 | } |
671 | ||
b7702a21 MH |
672 | /* Check the name is good for event/group */ |
673 | static bool check_event_name(const char *name) | |
674 | { | |
675 | if (!isalpha(*name) && *name != '_') | |
676 | return false; | |
677 | while (*++name != '\0') { | |
678 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
679 | return false; | |
680 | } | |
681 | return true; | |
682 | } | |
683 | ||
50656eec | 684 | /* Parse probepoint definition. */ |
146a1439 | 685 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 686 | { |
4235b045 | 687 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
688 | char *ptr, *tmp; |
689 | char c, nc = 0; | |
690 | /* | |
691 | * <Syntax> | |
2a9c8c36 MH |
692 | * perf probe [EVENT=]SRC[:LN|;PTN] |
693 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
694 | * |
695 | * TODO:Group name support | |
50656eec MH |
696 | */ |
697 | ||
2a9c8c36 MH |
698 | ptr = strpbrk(arg, ";=@+%"); |
699 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
700 | *ptr = '\0'; |
701 | tmp = ptr + 1; | |
146a1439 MH |
702 | if (strchr(arg, ':')) { |
703 | semantic_error("Group name is not supported yet.\n"); | |
704 | return -ENOTSUP; | |
705 | } | |
706 | if (!check_event_name(arg)) { | |
b7702a21 | 707 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
708 | "follow C symbol-naming rule.\n", arg); |
709 | return -EINVAL; | |
710 | } | |
02b95dad MH |
711 | pev->event = strdup(arg); |
712 | if (pev->event == NULL) | |
713 | return -ENOMEM; | |
4235b045 | 714 | pev->group = NULL; |
af663d75 MH |
715 | arg = tmp; |
716 | } | |
717 | ||
2a9c8c36 | 718 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
719 | if (ptr) { |
720 | nc = *ptr; | |
721 | *ptr++ = '\0'; | |
722 | } | |
723 | ||
02b95dad MH |
724 | tmp = strdup(arg); |
725 | if (tmp == NULL) | |
726 | return -ENOMEM; | |
727 | ||
50656eec | 728 | /* Check arg is function or file and copy it */ |
02b95dad MH |
729 | if (strchr(tmp, '.')) /* File */ |
730 | pp->file = tmp; | |
50656eec | 731 | else /* Function */ |
02b95dad | 732 | pp->function = tmp; |
50656eec MH |
733 | |
734 | /* Parse other options */ | |
735 | while (ptr) { | |
736 | arg = ptr; | |
737 | c = nc; | |
2a9c8c36 | 738 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
739 | pp->lazy_line = strdup(arg); |
740 | if (pp->lazy_line == NULL) | |
741 | return -ENOMEM; | |
2a9c8c36 MH |
742 | break; |
743 | } | |
744 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
745 | if (ptr) { |
746 | nc = *ptr; | |
747 | *ptr++ = '\0'; | |
748 | } | |
749 | switch (c) { | |
750 | case ':': /* Line number */ | |
751 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 752 | if (*tmp != '\0') { |
2a9c8c36 | 753 | semantic_error("There is non-digit char" |
146a1439 MH |
754 | " in line number.\n"); |
755 | return -EINVAL; | |
756 | } | |
50656eec MH |
757 | break; |
758 | case '+': /* Byte offset from a symbol */ | |
759 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 760 | if (*tmp != '\0') { |
2a9c8c36 | 761 | semantic_error("There is non-digit character" |
146a1439 MH |
762 | " in offset.\n"); |
763 | return -EINVAL; | |
764 | } | |
50656eec MH |
765 | break; |
766 | case '@': /* File name */ | |
146a1439 MH |
767 | if (pp->file) { |
768 | semantic_error("SRC@SRC is not allowed.\n"); | |
769 | return -EINVAL; | |
770 | } | |
02b95dad MH |
771 | pp->file = strdup(arg); |
772 | if (pp->file == NULL) | |
773 | return -ENOMEM; | |
50656eec MH |
774 | break; |
775 | case '%': /* Probe places */ | |
776 | if (strcmp(arg, "return") == 0) { | |
777 | pp->retprobe = 1; | |
146a1439 MH |
778 | } else { /* Others not supported yet */ |
779 | semantic_error("%%%s is not supported.\n", arg); | |
780 | return -ENOTSUP; | |
781 | } | |
50656eec | 782 | break; |
146a1439 MH |
783 | default: /* Buggy case */ |
784 | pr_err("This program has a bug at %s:%d.\n", | |
785 | __FILE__, __LINE__); | |
786 | return -ENOTSUP; | |
50656eec MH |
787 | break; |
788 | } | |
789 | } | |
790 | ||
791 | /* Exclusion check */ | |
146a1439 | 792 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
793 | semantic_error("Lazy pattern can't be used with" |
794 | " line number.\n"); | |
146a1439 MH |
795 | return -EINVAL; |
796 | } | |
2a9c8c36 | 797 | |
146a1439 | 798 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 799 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
800 | return -EINVAL; |
801 | } | |
2a9c8c36 | 802 | |
146a1439 | 803 | if (pp->line && pp->offset) { |
0e43e5d2 | 804 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
805 | return -EINVAL; |
806 | } | |
50656eec | 807 | |
146a1439 | 808 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 809 | semantic_error("File always requires line number or " |
0e43e5d2 | 810 | "lazy pattern.\n"); |
146a1439 MH |
811 | return -EINVAL; |
812 | } | |
50656eec | 813 | |
146a1439 | 814 | if (pp->offset && !pp->function) { |
0e43e5d2 | 815 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
816 | return -EINVAL; |
817 | } | |
50656eec | 818 | |
146a1439 | 819 | if (pp->retprobe && !pp->function) { |
0e43e5d2 | 820 | semantic_error("Return probe requires an entry function.\n"); |
146a1439 MH |
821 | return -EINVAL; |
822 | } | |
50656eec | 823 | |
146a1439 | 824 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 825 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 826 | "return probe.\n"); |
146a1439 MH |
827 | return -EINVAL; |
828 | } | |
50656eec | 829 | |
4235b045 | 830 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
831 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
832 | pp->lazy_line); | |
146a1439 | 833 | return 0; |
50656eec MH |
834 | } |
835 | ||
7df2f329 | 836 | /* Parse perf-probe event argument */ |
146a1439 | 837 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 838 | { |
b2a3c12b | 839 | char *tmp, *goodname; |
7df2f329 MH |
840 | struct perf_probe_arg_field **fieldp; |
841 | ||
842 | pr_debug("parsing arg: %s into ", str); | |
843 | ||
48481938 MH |
844 | tmp = strchr(str, '='); |
845 | if (tmp) { | |
02b95dad MH |
846 | arg->name = strndup(str, tmp - str); |
847 | if (arg->name == NULL) | |
848 | return -ENOMEM; | |
11a1ca35 | 849 | pr_debug("name:%s ", arg->name); |
48481938 MH |
850 | str = tmp + 1; |
851 | } | |
852 | ||
11a1ca35 MH |
853 | tmp = strchr(str, ':'); |
854 | if (tmp) { /* Type setting */ | |
855 | *tmp = '\0'; | |
02b95dad MH |
856 | arg->type = strdup(tmp + 1); |
857 | if (arg->type == NULL) | |
858 | return -ENOMEM; | |
11a1ca35 MH |
859 | pr_debug("type:%s ", arg->type); |
860 | } | |
861 | ||
b2a3c12b | 862 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
863 | if (!is_c_varname(str) || !tmp) { |
864 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
865 | arg->var = strdup(str); |
866 | if (arg->var == NULL) | |
867 | return -ENOMEM; | |
48481938 | 868 | pr_debug("%s\n", arg->var); |
146a1439 | 869 | return 0; |
7df2f329 MH |
870 | } |
871 | ||
b2a3c12b | 872 | /* Structure fields or array element */ |
02b95dad MH |
873 | arg->var = strndup(str, tmp - str); |
874 | if (arg->var == NULL) | |
875 | return -ENOMEM; | |
b2a3c12b | 876 | goodname = arg->var; |
48481938 | 877 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
878 | fieldp = &arg->field; |
879 | ||
880 | do { | |
e334016f MH |
881 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
882 | if (*fieldp == NULL) | |
883 | return -ENOMEM; | |
b2a3c12b MH |
884 | if (*tmp == '[') { /* Array */ |
885 | str = tmp; | |
886 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 887 | (*fieldp)->ref = true; |
b2a3c12b MH |
888 | if (*tmp != ']' || tmp == str + 1) { |
889 | semantic_error("Array index must be a" | |
890 | " number.\n"); | |
891 | return -EINVAL; | |
892 | } | |
893 | tmp++; | |
894 | if (*tmp == '\0') | |
895 | tmp = NULL; | |
896 | } else { /* Structure */ | |
897 | if (*tmp == '.') { | |
898 | str = tmp + 1; | |
899 | (*fieldp)->ref = false; | |
900 | } else if (tmp[1] == '>') { | |
901 | str = tmp + 2; | |
902 | (*fieldp)->ref = true; | |
903 | } else { | |
904 | semantic_error("Argument parse error: %s\n", | |
905 | str); | |
906 | return -EINVAL; | |
907 | } | |
908 | tmp = strpbrk(str, "-.["); | |
146a1439 | 909 | } |
7df2f329 | 910 | if (tmp) { |
02b95dad MH |
911 | (*fieldp)->name = strndup(str, tmp - str); |
912 | if ((*fieldp)->name == NULL) | |
913 | return -ENOMEM; | |
b2a3c12b MH |
914 | if (*str != '[') |
915 | goodname = (*fieldp)->name; | |
7df2f329 MH |
916 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
917 | fieldp = &(*fieldp)->next; | |
918 | } | |
919 | } while (tmp); | |
02b95dad MH |
920 | (*fieldp)->name = strdup(str); |
921 | if ((*fieldp)->name == NULL) | |
922 | return -ENOMEM; | |
b2a3c12b MH |
923 | if (*str != '[') |
924 | goodname = (*fieldp)->name; | |
7df2f329 | 925 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 926 | |
b2a3c12b | 927 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 928 | if (!arg->name) { |
b2a3c12b | 929 | arg->name = strdup(goodname); |
02b95dad MH |
930 | if (arg->name == NULL) |
931 | return -ENOMEM; | |
932 | } | |
146a1439 | 933 | return 0; |
7df2f329 MH |
934 | } |
935 | ||
4235b045 | 936 | /* Parse perf-probe event command */ |
146a1439 | 937 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 938 | { |
e1c01d61 | 939 | char **argv; |
146a1439 | 940 | int argc, i, ret = 0; |
fac13fd5 | 941 | |
4235b045 | 942 | argv = argv_split(cmd, &argc); |
146a1439 MH |
943 | if (!argv) { |
944 | pr_debug("Failed to split arguments.\n"); | |
945 | return -ENOMEM; | |
946 | } | |
947 | if (argc - 1 > MAX_PROBE_ARGS) { | |
948 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
949 | ret = -ERANGE; | |
950 | goto out; | |
951 | } | |
50656eec | 952 | /* Parse probe point */ |
146a1439 MH |
953 | ret = parse_perf_probe_point(argv[0], pev); |
954 | if (ret < 0) | |
955 | goto out; | |
50656eec | 956 | |
e1c01d61 | 957 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 958 | pev->nargs = argc - 1; |
e334016f MH |
959 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
960 | if (pev->args == NULL) { | |
961 | ret = -ENOMEM; | |
962 | goto out; | |
963 | } | |
146a1439 MH |
964 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
965 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
966 | if (ret >= 0 && | |
967 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 968 | semantic_error("You can't specify local variable for" |
146a1439 MH |
969 | " kretprobe.\n"); |
970 | ret = -EINVAL; | |
971 | } | |
e1c01d61 | 972 | } |
146a1439 | 973 | out: |
e1c01d61 | 974 | argv_free(argv); |
146a1439 MH |
975 | |
976 | return ret; | |
50656eec MH |
977 | } |
978 | ||
4235b045 MH |
979 | /* Return true if this perf_probe_event requires debuginfo */ |
980 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
981 | { | |
982 | int i; | |
983 | ||
984 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
985 | return true; | |
986 | ||
987 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 988 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
989 | return true; |
990 | ||
991 | return false; | |
992 | } | |
993 | ||
0e60836b SD |
994 | /* Parse probe_events event into struct probe_point */ |
995 | static int parse_probe_trace_command(const char *cmd, | |
996 | struct probe_trace_event *tev) | |
4de189fe | 997 | { |
0e60836b | 998 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
999 | char pr; |
1000 | char *p; | |
1001 | int ret, i, argc; | |
1002 | char **argv; | |
1003 | ||
0e60836b | 1004 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 1005 | argv = argv_split(cmd, &argc); |
146a1439 MH |
1006 | if (!argv) { |
1007 | pr_debug("Failed to split arguments.\n"); | |
1008 | return -ENOMEM; | |
1009 | } | |
1010 | if (argc < 2) { | |
1011 | semantic_error("Too few probe arguments.\n"); | |
1012 | ret = -ERANGE; | |
1013 | goto out; | |
1014 | } | |
4de189fe MH |
1015 | |
1016 | /* Scan event and group name. */ | |
93aaa45a | 1017 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
1018 | &pr, (float *)(void *)&tev->group, |
1019 | (float *)(void *)&tev->event); | |
146a1439 MH |
1020 | if (ret != 3) { |
1021 | semantic_error("Failed to parse event name: %s\n", argv[0]); | |
1022 | ret = -EINVAL; | |
1023 | goto out; | |
1024 | } | |
4235b045 | 1025 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 1026 | |
4235b045 | 1027 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
1028 | |
1029 | /* Scan function name and offset */ | |
4235b045 MH |
1030 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
1031 | &tp->offset); | |
4de189fe | 1032 | if (ret == 1) |
4235b045 | 1033 | tp->offset = 0; |
4de189fe | 1034 | |
4235b045 | 1035 | tev->nargs = argc - 2; |
0e60836b | 1036 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
1037 | if (tev->args == NULL) { |
1038 | ret = -ENOMEM; | |
1039 | goto out; | |
1040 | } | |
4235b045 | 1041 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
1042 | p = strchr(argv[i + 2], '='); |
1043 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
1044 | *p++ = '\0'; |
1045 | else | |
1046 | p = argv[i + 2]; | |
02b95dad | 1047 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1048 | /* TODO: parse regs and offset */ |
02b95dad MH |
1049 | tev->args[i].value = strdup(p); |
1050 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1051 | ret = -ENOMEM; | |
1052 | goto out; | |
1053 | } | |
4de189fe | 1054 | } |
146a1439 MH |
1055 | ret = 0; |
1056 | out: | |
4de189fe | 1057 | argv_free(argv); |
146a1439 | 1058 | return ret; |
4de189fe MH |
1059 | } |
1060 | ||
7df2f329 MH |
1061 | /* Compose only probe arg */ |
1062 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
1063 | { | |
1064 | struct perf_probe_arg_field *field = pa->field; | |
1065 | int ret; | |
1066 | char *tmp = buf; | |
1067 | ||
48481938 MH |
1068 | if (pa->name && pa->var) |
1069 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
1070 | else | |
1071 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
1072 | if (ret <= 0) |
1073 | goto error; | |
1074 | tmp += ret; | |
1075 | len -= ret; | |
1076 | ||
1077 | while (field) { | |
b2a3c12b MH |
1078 | if (field->name[0] == '[') |
1079 | ret = e_snprintf(tmp, len, "%s", field->name); | |
1080 | else | |
1081 | ret = e_snprintf(tmp, len, "%s%s", | |
1082 | field->ref ? "->" : ".", field->name); | |
7df2f329 MH |
1083 | if (ret <= 0) |
1084 | goto error; | |
1085 | tmp += ret; | |
1086 | len -= ret; | |
1087 | field = field->next; | |
1088 | } | |
11a1ca35 MH |
1089 | |
1090 | if (pa->type) { | |
1091 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
1092 | if (ret <= 0) | |
1093 | goto error; | |
1094 | tmp += ret; | |
1095 | len -= ret; | |
1096 | } | |
1097 | ||
7df2f329 MH |
1098 | return tmp - buf; |
1099 | error: | |
0e43e5d2 | 1100 | pr_debug("Failed to synthesize perf probe argument: %s\n", |
146a1439 MH |
1101 | strerror(-ret)); |
1102 | return ret; | |
7df2f329 MH |
1103 | } |
1104 | ||
4235b045 MH |
1105 | /* Compose only probe point (not argument) */ |
1106 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 1107 | { |
fb1587d8 MH |
1108 | char *buf, *tmp; |
1109 | char offs[32] = "", line[32] = "", file[32] = ""; | |
1110 | int ret, len; | |
4de189fe | 1111 | |
e334016f MH |
1112 | buf = zalloc(MAX_CMDLEN); |
1113 | if (buf == NULL) { | |
1114 | ret = -ENOMEM; | |
1115 | goto error; | |
1116 | } | |
4de189fe | 1117 | if (pp->offset) { |
fb1587d8 | 1118 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
1119 | if (ret <= 0) |
1120 | goto error; | |
1121 | } | |
1122 | if (pp->line) { | |
fb1587d8 MH |
1123 | ret = e_snprintf(line, 32, ":%d", pp->line); |
1124 | if (ret <= 0) | |
1125 | goto error; | |
1126 | } | |
1127 | if (pp->file) { | |
32ae2ade FBH |
1128 | tmp = pp->file; |
1129 | len = strlen(tmp); | |
1130 | if (len > 30) { | |
1131 | tmp = strchr(pp->file + len - 30, '/'); | |
1132 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1133 | } | |
1134 | ret = e_snprintf(file, 32, "@%s", tmp); | |
4de189fe MH |
1135 | if (ret <= 0) |
1136 | goto error; | |
1137 | } | |
1138 | ||
1139 | if (pp->function) | |
fb1587d8 MH |
1140 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
1141 | offs, pp->retprobe ? "%return" : "", line, | |
1142 | file); | |
4de189fe | 1143 | else |
fb1587d8 | 1144 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
1145 | if (ret <= 0) |
1146 | goto error; | |
1147 | ||
1148 | return buf; | |
7ef17aaf | 1149 | error: |
0e43e5d2 | 1150 | pr_debug("Failed to synthesize perf probe point: %s\n", |
146a1439 | 1151 | strerror(-ret)); |
e334016f MH |
1152 | if (buf) |
1153 | free(buf); | |
146a1439 | 1154 | return NULL; |
7ef17aaf MH |
1155 | } |
1156 | ||
4235b045 MH |
1157 | #if 0 |
1158 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
1159 | { |
1160 | char *buf; | |
1161 | int i, len, ret; | |
1162 | ||
4235b045 MH |
1163 | buf = synthesize_perf_probe_point(&pev->point); |
1164 | if (!buf) | |
1165 | return NULL; | |
4de189fe | 1166 | |
4235b045 MH |
1167 | len = strlen(buf); |
1168 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 1169 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
1170 | pev->args[i].name); |
1171 | if (ret <= 0) { | |
1172 | free(buf); | |
1173 | return NULL; | |
1174 | } | |
4de189fe MH |
1175 | len += ret; |
1176 | } | |
4de189fe | 1177 | |
4235b045 MH |
1178 | return buf; |
1179 | } | |
1180 | #endif | |
1181 | ||
0e60836b | 1182 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
4235b045 MH |
1183 | char **buf, size_t *buflen, |
1184 | int depth) | |
1185 | { | |
1186 | int ret; | |
1187 | if (ref->next) { | |
0e60836b | 1188 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
4235b045 MH |
1189 | buflen, depth + 1); |
1190 | if (depth < 0) | |
1191 | goto out; | |
1192 | } | |
1193 | ||
1194 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
1195 | if (ret < 0) | |
1196 | depth = ret; | |
1197 | else { | |
1198 | *buf += ret; | |
1199 | *buflen -= ret; | |
1200 | } | |
1201 | out: | |
1202 | return depth; | |
4de189fe | 1203 | |
4de189fe MH |
1204 | } |
1205 | ||
0e60836b | 1206 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
4235b045 | 1207 | char *buf, size_t buflen) |
50656eec | 1208 | { |
0e60836b | 1209 | struct probe_trace_arg_ref *ref = arg->ref; |
4235b045 MH |
1210 | int ret, depth = 0; |
1211 | char *tmp = buf; | |
1212 | ||
1213 | /* Argument name or separator */ | |
1214 | if (arg->name) | |
1215 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
1216 | else | |
1217 | ret = e_snprintf(buf, buflen, " "); | |
1218 | if (ret < 0) | |
1219 | return ret; | |
1220 | buf += ret; | |
1221 | buflen -= ret; | |
1222 | ||
b7dcb857 MH |
1223 | /* Special case: @XXX */ |
1224 | if (arg->value[0] == '@' && arg->ref) | |
1225 | ref = ref->next; | |
1226 | ||
4235b045 | 1227 | /* Dereferencing arguments */ |
b7dcb857 | 1228 | if (ref) { |
0e60836b | 1229 | depth = __synthesize_probe_trace_arg_ref(ref, &buf, |
4235b045 MH |
1230 | &buflen, 1); |
1231 | if (depth < 0) | |
1232 | return depth; | |
1233 | } | |
1234 | ||
1235 | /* Print argument value */ | |
b7dcb857 MH |
1236 | if (arg->value[0] == '@' && arg->ref) |
1237 | ret = e_snprintf(buf, buflen, "%s%+ld", arg->value, | |
1238 | arg->ref->offset); | |
1239 | else | |
1240 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
4235b045 MH |
1241 | if (ret < 0) |
1242 | return ret; | |
1243 | buf += ret; | |
1244 | buflen -= ret; | |
1245 | ||
1246 | /* Closing */ | |
1247 | while (depth--) { | |
1248 | ret = e_snprintf(buf, buflen, ")"); | |
1249 | if (ret < 0) | |
1250 | return ret; | |
1251 | buf += ret; | |
1252 | buflen -= ret; | |
1253 | } | |
4984912e MH |
1254 | /* Print argument type */ |
1255 | if (arg->type) { | |
1256 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
1257 | if (ret <= 0) | |
1258 | return ret; | |
1259 | buf += ret; | |
1260 | } | |
4235b045 MH |
1261 | |
1262 | return buf - tmp; | |
1263 | } | |
1264 | ||
0e60836b | 1265 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1266 | { |
0e60836b | 1267 | struct probe_trace_point *tp = &tev->point; |
50656eec MH |
1268 | char *buf; |
1269 | int i, len, ret; | |
1270 | ||
e334016f MH |
1271 | buf = zalloc(MAX_CMDLEN); |
1272 | if (buf == NULL) | |
1273 | return NULL; | |
1274 | ||
4235b045 MH |
1275 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", |
1276 | tp->retprobe ? 'r' : 'p', | |
1277 | tev->group, tev->event, | |
1278 | tp->symbol, tp->offset); | |
1279 | if (len <= 0) | |
50656eec | 1280 | goto error; |
50656eec | 1281 | |
4235b045 | 1282 | for (i = 0; i < tev->nargs; i++) { |
0e60836b | 1283 | ret = synthesize_probe_trace_arg(&tev->args[i], buf + len, |
4235b045 | 1284 | MAX_CMDLEN - len); |
4de189fe | 1285 | if (ret <= 0) |
50656eec MH |
1286 | goto error; |
1287 | len += ret; | |
1288 | } | |
50656eec | 1289 | |
4235b045 | 1290 | return buf; |
50656eec | 1291 | error: |
4235b045 MH |
1292 | free(buf); |
1293 | return NULL; | |
1294 | } | |
50656eec | 1295 | |
0e60836b | 1296 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
469b9b88 | 1297 | struct perf_probe_event *pev) |
4235b045 | 1298 | { |
02b95dad | 1299 | char buf[64] = ""; |
146a1439 | 1300 | int i, ret; |
4235b045 | 1301 | |
4b4da7f7 | 1302 | /* Convert event/group name */ |
02b95dad MH |
1303 | pev->event = strdup(tev->event); |
1304 | pev->group = strdup(tev->group); | |
1305 | if (pev->event == NULL || pev->group == NULL) | |
1306 | return -ENOMEM; | |
fb1587d8 | 1307 | |
4b4da7f7 | 1308 | /* Convert trace_point to probe_point */ |
0e60836b | 1309 | ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point); |
146a1439 MH |
1310 | if (ret < 0) |
1311 | return ret; | |
4b4da7f7 | 1312 | |
4235b045 MH |
1313 | /* Convert trace_arg to probe_arg */ |
1314 | pev->nargs = tev->nargs; | |
e334016f MH |
1315 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1316 | if (pev->args == NULL) | |
1317 | return -ENOMEM; | |
02b95dad | 1318 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1319 | if (tev->args[i].name) |
02b95dad | 1320 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1321 | else { |
0e60836b | 1322 | ret = synthesize_probe_trace_arg(&tev->args[i], |
146a1439 | 1323 | buf, 64); |
02b95dad | 1324 | pev->args[i].name = strdup(buf); |
4235b045 | 1325 | } |
02b95dad MH |
1326 | if (pev->args[i].name == NULL && ret >= 0) |
1327 | ret = -ENOMEM; | |
1328 | } | |
146a1439 MH |
1329 | |
1330 | if (ret < 0) | |
1331 | clear_perf_probe_event(pev); | |
1332 | ||
1333 | return ret; | |
4235b045 MH |
1334 | } |
1335 | ||
1336 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
1337 | { | |
1338 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 1339 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
1340 | int i; |
1341 | ||
1342 | if (pev->event) | |
1343 | free(pev->event); | |
1344 | if (pev->group) | |
1345 | free(pev->group); | |
1346 | if (pp->file) | |
1347 | free(pp->file); | |
1348 | if (pp->function) | |
1349 | free(pp->function); | |
1350 | if (pp->lazy_line) | |
1351 | free(pp->lazy_line); | |
7df2f329 | 1352 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
1353 | if (pev->args[i].name) |
1354 | free(pev->args[i].name); | |
48481938 MH |
1355 | if (pev->args[i].var) |
1356 | free(pev->args[i].var); | |
11a1ca35 MH |
1357 | if (pev->args[i].type) |
1358 | free(pev->args[i].type); | |
7df2f329 MH |
1359 | field = pev->args[i].field; |
1360 | while (field) { | |
1361 | next = field->next; | |
1362 | if (field->name) | |
1363 | free(field->name); | |
1364 | free(field); | |
1365 | field = next; | |
1366 | } | |
1367 | } | |
4235b045 MH |
1368 | if (pev->args) |
1369 | free(pev->args); | |
1370 | memset(pev, 0, sizeof(*pev)); | |
1371 | } | |
1372 | ||
0e60836b | 1373 | static void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 1374 | { |
0e60836b | 1375 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
1376 | int i; |
1377 | ||
1378 | if (tev->event) | |
1379 | free(tev->event); | |
1380 | if (tev->group) | |
1381 | free(tev->group); | |
1382 | if (tev->point.symbol) | |
1383 | free(tev->point.symbol); | |
1384 | for (i = 0; i < tev->nargs; i++) { | |
1385 | if (tev->args[i].name) | |
1386 | free(tev->args[i].name); | |
1387 | if (tev->args[i].value) | |
1388 | free(tev->args[i].value); | |
4984912e MH |
1389 | if (tev->args[i].type) |
1390 | free(tev->args[i].type); | |
4235b045 MH |
1391 | ref = tev->args[i].ref; |
1392 | while (ref) { | |
1393 | next = ref->next; | |
1394 | free(ref); | |
1395 | ref = next; | |
1396 | } | |
1397 | } | |
1398 | if (tev->args) | |
1399 | free(tev->args); | |
1400 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
1401 | } |
1402 | ||
f4d7da49 | 1403 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
1404 | { |
1405 | char buf[PATH_MAX]; | |
7ca5989d | 1406 | const char *__debugfs; |
4de189fe MH |
1407 | int ret; |
1408 | ||
7ca5989d MH |
1409 | __debugfs = debugfs_find_mountpoint(); |
1410 | if (__debugfs == NULL) { | |
1411 | pr_warning("Debugfs is not mounted.\n"); | |
1412 | return -ENOENT; | |
1413 | } | |
1414 | ||
1415 | ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs); | |
146a1439 | 1416 | if (ret >= 0) { |
7ca5989d | 1417 | pr_debug("Opening %s write=%d\n", buf, readwrite); |
146a1439 MH |
1418 | if (readwrite && !probe_event_dry_run) |
1419 | ret = open(buf, O_RDWR, O_APPEND); | |
1420 | else | |
1421 | ret = open(buf, O_RDONLY, 0); | |
1422 | } | |
f4d7da49 | 1423 | |
4de189fe MH |
1424 | if (ret < 0) { |
1425 | if (errno == ENOENT) | |
146a1439 MH |
1426 | pr_warning("kprobe_events file does not exist - please" |
1427 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); | |
4de189fe | 1428 | else |
146a1439 MH |
1429 | pr_warning("Failed to open kprobe_events file: %s\n", |
1430 | strerror(errno)); | |
4de189fe MH |
1431 | } |
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | /* Get raw string list of current kprobe_events */ | |
0e60836b | 1436 | static struct strlist *get_probe_trace_command_rawlist(int fd) |
4de189fe MH |
1437 | { |
1438 | int ret, idx; | |
1439 | FILE *fp; | |
1440 | char buf[MAX_CMDLEN]; | |
1441 | char *p; | |
1442 | struct strlist *sl; | |
1443 | ||
1444 | sl = strlist__new(true, NULL); | |
1445 | ||
1446 | fp = fdopen(dup(fd), "r"); | |
1447 | while (!feof(fp)) { | |
1448 | p = fgets(buf, MAX_CMDLEN, fp); | |
1449 | if (!p) | |
1450 | break; | |
1451 | ||
1452 | idx = strlen(p) - 1; | |
1453 | if (p[idx] == '\n') | |
1454 | p[idx] = '\0'; | |
1455 | ret = strlist__add(sl, buf); | |
146a1439 MH |
1456 | if (ret < 0) { |
1457 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); | |
1458 | strlist__delete(sl); | |
1459 | return NULL; | |
1460 | } | |
4de189fe MH |
1461 | } |
1462 | fclose(fp); | |
1463 | ||
1464 | return sl; | |
1465 | } | |
1466 | ||
278498d4 | 1467 | /* Show an event */ |
146a1439 | 1468 | static int show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 1469 | { |
7e990a51 | 1470 | int i, ret; |
278498d4 | 1471 | char buf[128]; |
4235b045 | 1472 | char *place; |
278498d4 | 1473 | |
4235b045 MH |
1474 | /* Synthesize only event probe point */ |
1475 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
1476 | if (!place) |
1477 | return -EINVAL; | |
4235b045 MH |
1478 | |
1479 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 | 1480 | if (ret < 0) |
146a1439 MH |
1481 | return ret; |
1482 | ||
fb1587d8 | 1483 | printf(" %-20s (on %s", buf, place); |
278498d4 | 1484 | |
4235b045 | 1485 | if (pev->nargs > 0) { |
278498d4 | 1486 | printf(" with"); |
7df2f329 | 1487 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
1488 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1489 | buf, 128); | |
1490 | if (ret < 0) | |
1491 | break; | |
7df2f329 MH |
1492 | printf(" %s", buf); |
1493 | } | |
278498d4 MH |
1494 | } |
1495 | printf(")\n"); | |
4235b045 | 1496 | free(place); |
146a1439 | 1497 | return ret; |
278498d4 MH |
1498 | } |
1499 | ||
4de189fe | 1500 | /* List up current perf-probe events */ |
146a1439 | 1501 | int show_perf_probe_events(void) |
4de189fe | 1502 | { |
146a1439 | 1503 | int fd, ret; |
0e60836b | 1504 | struct probe_trace_event tev; |
4235b045 | 1505 | struct perf_probe_event pev; |
4de189fe MH |
1506 | struct strlist *rawlist; |
1507 | struct str_node *ent; | |
1508 | ||
72041334 | 1509 | setup_pager(); |
146a1439 MH |
1510 | ret = init_vmlinux(); |
1511 | if (ret < 0) | |
1512 | return ret; | |
4235b045 MH |
1513 | |
1514 | memset(&tev, 0, sizeof(tev)); | |
1515 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 1516 | |
f4d7da49 | 1517 | fd = open_kprobe_events(false); |
146a1439 MH |
1518 | if (fd < 0) |
1519 | return fd; | |
1520 | ||
0e60836b | 1521 | rawlist = get_probe_trace_command_rawlist(fd); |
4de189fe | 1522 | close(fd); |
146a1439 MH |
1523 | if (!rawlist) |
1524 | return -ENOENT; | |
4de189fe | 1525 | |
adf365f4 | 1526 | strlist__for_each(ent, rawlist) { |
0e60836b | 1527 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1528 | if (ret >= 0) { |
1529 | ret = convert_to_perf_probe_event(&tev, &pev); | |
1530 | if (ret >= 0) | |
1531 | ret = show_perf_probe_event(&pev); | |
1532 | } | |
4235b045 | 1533 | clear_perf_probe_event(&pev); |
0e60836b | 1534 | clear_probe_trace_event(&tev); |
146a1439 MH |
1535 | if (ret < 0) |
1536 | break; | |
4de189fe | 1537 | } |
4de189fe | 1538 | strlist__delete(rawlist); |
146a1439 MH |
1539 | |
1540 | return ret; | |
4de189fe MH |
1541 | } |
1542 | ||
b498ce1f | 1543 | /* Get current perf-probe event names */ |
0e60836b | 1544 | static struct strlist *get_probe_trace_event_names(int fd, bool include_group) |
b498ce1f | 1545 | { |
fa28244d | 1546 | char buf[128]; |
b498ce1f MH |
1547 | struct strlist *sl, *rawlist; |
1548 | struct str_node *ent; | |
0e60836b | 1549 | struct probe_trace_event tev; |
146a1439 | 1550 | int ret = 0; |
b498ce1f | 1551 | |
4235b045 | 1552 | memset(&tev, 0, sizeof(tev)); |
0e60836b | 1553 | rawlist = get_probe_trace_command_rawlist(fd); |
e1d2017b | 1554 | sl = strlist__new(true, NULL); |
adf365f4 | 1555 | strlist__for_each(ent, rawlist) { |
0e60836b | 1556 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1557 | if (ret < 0) |
1558 | break; | |
fa28244d | 1559 | if (include_group) { |
146a1439 MH |
1560 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1561 | tev.event); | |
1562 | if (ret >= 0) | |
1563 | ret = strlist__add(sl, buf); | |
fa28244d | 1564 | } else |
146a1439 | 1565 | ret = strlist__add(sl, tev.event); |
0e60836b | 1566 | clear_probe_trace_event(&tev); |
146a1439 MH |
1567 | if (ret < 0) |
1568 | break; | |
b498ce1f | 1569 | } |
b498ce1f MH |
1570 | strlist__delete(rawlist); |
1571 | ||
146a1439 MH |
1572 | if (ret < 0) { |
1573 | strlist__delete(sl); | |
1574 | return NULL; | |
1575 | } | |
b498ce1f MH |
1576 | return sl; |
1577 | } | |
1578 | ||
0e60836b | 1579 | static int write_probe_trace_event(int fd, struct probe_trace_event *tev) |
50656eec | 1580 | { |
6eca8cc3 | 1581 | int ret = 0; |
0e60836b | 1582 | char *buf = synthesize_probe_trace_command(tev); |
50656eec | 1583 | |
146a1439 | 1584 | if (!buf) { |
0e60836b | 1585 | pr_debug("Failed to synthesize probe trace event.\n"); |
146a1439 MH |
1586 | return -EINVAL; |
1587 | } | |
1588 | ||
fa28244d | 1589 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1590 | if (!probe_event_dry_run) { |
1591 | ret = write(fd, buf, strlen(buf)); | |
1592 | if (ret <= 0) | |
146a1439 MH |
1593 | pr_warning("Failed to write event: %s\n", |
1594 | strerror(errno)); | |
f4d7da49 | 1595 | } |
4235b045 | 1596 | free(buf); |
146a1439 | 1597 | return ret; |
50656eec MH |
1598 | } |
1599 | ||
146a1439 MH |
1600 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1601 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
1602 | { |
1603 | int i, ret; | |
17f88fcd MH |
1604 | |
1605 | /* Try no suffix */ | |
1606 | ret = e_snprintf(buf, len, "%s", base); | |
146a1439 MH |
1607 | if (ret < 0) { |
1608 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1609 | return ret; | |
1610 | } | |
17f88fcd | 1611 | if (!strlist__has_entry(namelist, buf)) |
146a1439 | 1612 | return 0; |
17f88fcd | 1613 | |
d761b08b MH |
1614 | if (!allow_suffix) { |
1615 | pr_warning("Error: event \"%s\" already exists. " | |
1616 | "(Use -f to force duplicates.)\n", base); | |
146a1439 | 1617 | return -EEXIST; |
d761b08b MH |
1618 | } |
1619 | ||
17f88fcd MH |
1620 | /* Try to add suffix */ |
1621 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f | 1622 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
146a1439 MH |
1623 | if (ret < 0) { |
1624 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1625 | return ret; | |
1626 | } | |
b498ce1f MH |
1627 | if (!strlist__has_entry(namelist, buf)) |
1628 | break; | |
1629 | } | |
146a1439 MH |
1630 | if (i == MAX_EVENT_INDEX) { |
1631 | pr_warning("Too many events are on the same function.\n"); | |
1632 | ret = -ERANGE; | |
1633 | } | |
1634 | ||
1635 | return ret; | |
b498ce1f MH |
1636 | } |
1637 | ||
0e60836b SD |
1638 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
1639 | struct probe_trace_event *tevs, | |
146a1439 | 1640 | int ntevs, bool allow_suffix) |
50656eec | 1641 | { |
146a1439 | 1642 | int i, fd, ret; |
0e60836b | 1643 | struct probe_trace_event *tev = NULL; |
4235b045 MH |
1644 | char buf[64]; |
1645 | const char *event, *group; | |
b498ce1f | 1646 | struct strlist *namelist; |
50656eec | 1647 | |
f4d7da49 | 1648 | fd = open_kprobe_events(true); |
146a1439 MH |
1649 | if (fd < 0) |
1650 | return fd; | |
b498ce1f | 1651 | /* Get current event names */ |
0e60836b | 1652 | namelist = get_probe_trace_event_names(fd, false); |
146a1439 MH |
1653 | if (!namelist) { |
1654 | pr_debug("Failed to get current event list.\n"); | |
1655 | return -EIO; | |
1656 | } | |
4235b045 | 1657 | |
146a1439 | 1658 | ret = 0; |
4235b045 | 1659 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
02b95dad | 1660 | for (i = 0; i < ntevs; i++) { |
4235b045 MH |
1661 | tev = &tevs[i]; |
1662 | if (pev->event) | |
1663 | event = pev->event; | |
1664 | else | |
1665 | if (pev->point.function) | |
1666 | event = pev->point.function; | |
1667 | else | |
1668 | event = tev->point.symbol; | |
1669 | if (pev->group) | |
1670 | group = pev->group; | |
1671 | else | |
1672 | group = PERFPROBE_GROUP; | |
1673 | ||
1674 | /* Get an unused new event name */ | |
146a1439 MH |
1675 | ret = get_new_event_name(buf, 64, event, |
1676 | namelist, allow_suffix); | |
1677 | if (ret < 0) | |
1678 | break; | |
4235b045 MH |
1679 | event = buf; |
1680 | ||
02b95dad MH |
1681 | tev->event = strdup(event); |
1682 | tev->group = strdup(group); | |
1683 | if (tev->event == NULL || tev->group == NULL) { | |
1684 | ret = -ENOMEM; | |
1685 | break; | |
1686 | } | |
0e60836b | 1687 | ret = write_probe_trace_event(fd, tev); |
146a1439 MH |
1688 | if (ret < 0) |
1689 | break; | |
4235b045 MH |
1690 | /* Add added event name to namelist */ |
1691 | strlist__add(namelist, event); | |
1692 | ||
1693 | /* Trick here - save current event/group */ | |
1694 | event = pev->event; | |
1695 | group = pev->group; | |
1696 | pev->event = tev->event; | |
1697 | pev->group = tev->group; | |
1698 | show_perf_probe_event(pev); | |
1699 | /* Trick here - restore current event/group */ | |
1700 | pev->event = (char *)event; | |
1701 | pev->group = (char *)group; | |
1702 | ||
1703 | /* | |
1704 | * Probes after the first probe which comes from same | |
1705 | * user input are always allowed to add suffix, because | |
1706 | * there might be several addresses corresponding to | |
1707 | * one code line. | |
1708 | */ | |
1709 | allow_suffix = true; | |
50656eec | 1710 | } |
146a1439 MH |
1711 | |
1712 | if (ret >= 0) { | |
1713 | /* Show how to use the event. */ | |
1714 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
1715 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, | |
1716 | tev->event); | |
1717 | } | |
a9b495b0 | 1718 | |
e1d2017b | 1719 | strlist__delete(namelist); |
50656eec | 1720 | close(fd); |
146a1439 | 1721 | return ret; |
50656eec | 1722 | } |
fa28244d | 1723 | |
0e60836b SD |
1724 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
1725 | struct probe_trace_event **tevs, | |
469b9b88 | 1726 | int max_tevs, const char *module) |
e0faa8d3 MH |
1727 | { |
1728 | struct symbol *sym; | |
e334016f | 1729 | int ret = 0, i; |
0e60836b | 1730 | struct probe_trace_event *tev; |
4235b045 | 1731 | |
4b4da7f7 | 1732 | /* Convert perf_probe_event with debuginfo */ |
469b9b88 | 1733 | ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module); |
e334016f MH |
1734 | if (ret != 0) |
1735 | return ret; | |
e0faa8d3 | 1736 | |
4235b045 | 1737 | /* Allocate trace event buffer */ |
0e60836b | 1738 | tev = *tevs = zalloc(sizeof(struct probe_trace_event)); |
e334016f MH |
1739 | if (tev == NULL) |
1740 | return -ENOMEM; | |
4235b045 MH |
1741 | |
1742 | /* Copy parameters */ | |
02b95dad MH |
1743 | tev->point.symbol = strdup(pev->point.function); |
1744 | if (tev->point.symbol == NULL) { | |
1745 | ret = -ENOMEM; | |
1746 | goto error; | |
1747 | } | |
4235b045 | 1748 | tev->point.offset = pev->point.offset; |
04ddd04b | 1749 | tev->point.retprobe = pev->point.retprobe; |
4235b045 MH |
1750 | tev->nargs = pev->nargs; |
1751 | if (tev->nargs) { | |
0e60836b | 1752 | tev->args = zalloc(sizeof(struct probe_trace_arg) |
e334016f MH |
1753 | * tev->nargs); |
1754 | if (tev->args == NULL) { | |
02b95dad MH |
1755 | ret = -ENOMEM; |
1756 | goto error; | |
e334016f | 1757 | } |
48481938 | 1758 | for (i = 0; i < tev->nargs; i++) { |
02b95dad MH |
1759 | if (pev->args[i].name) { |
1760 | tev->args[i].name = strdup(pev->args[i].name); | |
1761 | if (tev->args[i].name == NULL) { | |
1762 | ret = -ENOMEM; | |
1763 | goto error; | |
1764 | } | |
1765 | } | |
1766 | tev->args[i].value = strdup(pev->args[i].var); | |
1767 | if (tev->args[i].value == NULL) { | |
1768 | ret = -ENOMEM; | |
1769 | goto error; | |
1770 | } | |
1771 | if (pev->args[i].type) { | |
1772 | tev->args[i].type = strdup(pev->args[i].type); | |
1773 | if (tev->args[i].type == NULL) { | |
1774 | ret = -ENOMEM; | |
1775 | goto error; | |
1776 | } | |
1777 | } | |
48481938 | 1778 | } |
4235b045 MH |
1779 | } |
1780 | ||
1781 | /* Currently just checking function name from symbol map */ | |
469b9b88 | 1782 | sym = __find_kernel_function_by_name(tev->point.symbol, NULL); |
146a1439 MH |
1783 | if (!sym) { |
1784 | pr_warning("Kernel symbol \'%s\' not found.\n", | |
1785 | tev->point.symbol); | |
02b95dad MH |
1786 | ret = -ENOENT; |
1787 | goto error; | |
1788 | } | |
e334016f | 1789 | |
02b95dad MH |
1790 | return 1; |
1791 | error: | |
0e60836b | 1792 | clear_probe_trace_event(tev); |
02b95dad MH |
1793 | free(tev); |
1794 | *tevs = NULL; | |
e334016f | 1795 | return ret; |
4235b045 MH |
1796 | } |
1797 | ||
1798 | struct __event_package { | |
1799 | struct perf_probe_event *pev; | |
0e60836b | 1800 | struct probe_trace_event *tevs; |
4235b045 MH |
1801 | int ntevs; |
1802 | }; | |
1803 | ||
146a1439 | 1804 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
469b9b88 | 1805 | int max_tevs, const char *module, bool force_add) |
4235b045 | 1806 | { |
146a1439 | 1807 | int i, j, ret; |
4235b045 MH |
1808 | struct __event_package *pkgs; |
1809 | ||
e334016f MH |
1810 | pkgs = zalloc(sizeof(struct __event_package) * npevs); |
1811 | if (pkgs == NULL) | |
1812 | return -ENOMEM; | |
4235b045 MH |
1813 | |
1814 | /* Init vmlinux path */ | |
146a1439 | 1815 | ret = init_vmlinux(); |
449e5b24 MH |
1816 | if (ret < 0) { |
1817 | free(pkgs); | |
146a1439 | 1818 | return ret; |
449e5b24 | 1819 | } |
4235b045 MH |
1820 | |
1821 | /* Loop 1: convert all events */ | |
1822 | for (i = 0; i < npevs; i++) { | |
1823 | pkgs[i].pev = &pevs[i]; | |
1824 | /* Convert with or without debuginfo */ | |
0e60836b | 1825 | ret = convert_to_probe_trace_events(pkgs[i].pev, |
469b9b88 MH |
1826 | &pkgs[i].tevs, |
1827 | max_tevs, | |
1828 | module); | |
146a1439 MH |
1829 | if (ret < 0) |
1830 | goto end; | |
1831 | pkgs[i].ntevs = ret; | |
e0faa8d3 MH |
1832 | } |
1833 | ||
4235b045 | 1834 | /* Loop 2: add all events */ |
146a1439 | 1835 | for (i = 0; i < npevs && ret >= 0; i++) |
0e60836b | 1836 | ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs, |
146a1439 MH |
1837 | pkgs[i].ntevs, force_add); |
1838 | end: | |
449e5b24 MH |
1839 | /* Loop 3: cleanup and free trace events */ |
1840 | for (i = 0; i < npevs; i++) { | |
146a1439 | 1841 | for (j = 0; j < pkgs[i].ntevs; j++) |
0e60836b | 1842 | clear_probe_trace_event(&pkgs[i].tevs[j]); |
449e5b24 MH |
1843 | free(pkgs[i].tevs); |
1844 | } | |
1845 | free(pkgs); | |
146a1439 MH |
1846 | |
1847 | return ret; | |
e0faa8d3 MH |
1848 | } |
1849 | ||
0e60836b | 1850 | static int __del_trace_probe_event(int fd, struct str_node *ent) |
bbbb521b MH |
1851 | { |
1852 | char *p; | |
1853 | char buf[128]; | |
4235b045 | 1854 | int ret; |
bbbb521b | 1855 | |
0e60836b | 1856 | /* Convert from perf-probe event to trace-probe event */ |
146a1439 MH |
1857 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1858 | if (ret < 0) | |
1859 | goto error; | |
1860 | ||
bbbb521b | 1861 | p = strchr(buf + 2, ':'); |
146a1439 MH |
1862 | if (!p) { |
1863 | pr_debug("Internal error: %s should have ':' but not.\n", | |
1864 | ent->s); | |
1865 | ret = -ENOTSUP; | |
1866 | goto error; | |
1867 | } | |
bbbb521b MH |
1868 | *p = '/'; |
1869 | ||
4235b045 MH |
1870 | pr_debug("Writing event: %s\n", buf); |
1871 | ret = write(fd, buf, strlen(buf)); | |
146a1439 MH |
1872 | if (ret < 0) |
1873 | goto error; | |
1874 | ||
bbbb521b | 1875 | printf("Remove event: %s\n", ent->s); |
146a1439 MH |
1876 | return 0; |
1877 | error: | |
1878 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); | |
1879 | return ret; | |
bbbb521b MH |
1880 | } |
1881 | ||
0e60836b | 1882 | static int del_trace_probe_event(int fd, const char *group, |
146a1439 | 1883 | const char *event, struct strlist *namelist) |
fa28244d MH |
1884 | { |
1885 | char buf[128]; | |
bbbb521b | 1886 | struct str_node *ent, *n; |
146a1439 | 1887 | int found = 0, ret = 0; |
fa28244d | 1888 | |
146a1439 MH |
1889 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1890 | if (ret < 0) { | |
0e43e5d2 | 1891 | pr_err("Failed to copy event.\n"); |
146a1439 MH |
1892 | return ret; |
1893 | } | |
fa28244d | 1894 | |
bbbb521b MH |
1895 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1896 | strlist__for_each_safe(ent, n, namelist) | |
1897 | if (strglobmatch(ent->s, buf)) { | |
1898 | found++; | |
0e60836b | 1899 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1900 | if (ret < 0) |
1901 | break; | |
bbbb521b MH |
1902 | strlist__remove(namelist, ent); |
1903 | } | |
1904 | } else { | |
1905 | ent = strlist__find(namelist, buf); | |
1906 | if (ent) { | |
1907 | found++; | |
0e60836b | 1908 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1909 | if (ret >= 0) |
1910 | strlist__remove(namelist, ent); | |
bbbb521b MH |
1911 | } |
1912 | } | |
146a1439 MH |
1913 | if (found == 0 && ret >= 0) |
1914 | pr_info("Info: Event \"%s\" does not exist.\n", buf); | |
1915 | ||
1916 | return ret; | |
fa28244d MH |
1917 | } |
1918 | ||
146a1439 | 1919 | int del_perf_probe_events(struct strlist *dellist) |
fa28244d | 1920 | { |
146a1439 | 1921 | int fd, ret = 0; |
fa28244d MH |
1922 | const char *group, *event; |
1923 | char *p, *str; | |
1924 | struct str_node *ent; | |
1925 | struct strlist *namelist; | |
1926 | ||
f4d7da49 | 1927 | fd = open_kprobe_events(true); |
146a1439 MH |
1928 | if (fd < 0) |
1929 | return fd; | |
1930 | ||
fa28244d | 1931 | /* Get current event names */ |
0e60836b | 1932 | namelist = get_probe_trace_event_names(fd, true); |
146a1439 MH |
1933 | if (namelist == NULL) |
1934 | return -EINVAL; | |
fa28244d | 1935 | |
adf365f4 | 1936 | strlist__for_each(ent, dellist) { |
02b95dad MH |
1937 | str = strdup(ent->s); |
1938 | if (str == NULL) { | |
1939 | ret = -ENOMEM; | |
1940 | break; | |
1941 | } | |
bbbb521b | 1942 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1943 | p = strchr(str, ':'); |
1944 | if (p) { | |
1945 | group = str; | |
1946 | *p = '\0'; | |
1947 | event = p + 1; | |
1948 | } else { | |
bbbb521b | 1949 | group = "*"; |
fa28244d MH |
1950 | event = str; |
1951 | } | |
bbbb521b | 1952 | pr_debug("Group: %s, Event: %s\n", group, event); |
0e60836b | 1953 | ret = del_trace_probe_event(fd, group, event, namelist); |
fa28244d | 1954 | free(str); |
146a1439 MH |
1955 | if (ret < 0) |
1956 | break; | |
fa28244d MH |
1957 | } |
1958 | strlist__delete(namelist); | |
1959 | close(fd); | |
146a1439 MH |
1960 | |
1961 | return ret; | |
fa28244d | 1962 | } |
3c42258c MH |
1963 | /* TODO: don't use a global variable for filter ... */ |
1964 | static struct strfilter *available_func_filter; | |
fa28244d | 1965 | |
e80711ca | 1966 | /* |
3c42258c MH |
1967 | * If a symbol corresponds to a function with global binding and |
1968 | * matches filter return 0. For all others return 1. | |
e80711ca | 1969 | */ |
3c42258c MH |
1970 | static int filter_available_functions(struct map *map __unused, |
1971 | struct symbol *sym) | |
e80711ca | 1972 | { |
3c42258c MH |
1973 | if (sym->binding == STB_GLOBAL && |
1974 | strfilter__compare(available_func_filter, sym->name)) | |
1975 | return 0; | |
1976 | return 1; | |
e80711ca MH |
1977 | } |
1978 | ||
3c42258c | 1979 | int show_available_funcs(const char *module, struct strfilter *_filter) |
e80711ca MH |
1980 | { |
1981 | struct map *map; | |
1982 | int ret; | |
1983 | ||
1984 | setup_pager(); | |
1985 | ||
1986 | ret = init_vmlinux(); | |
1987 | if (ret < 0) | |
1988 | return ret; | |
1989 | ||
1990 | map = kernel_get_module_map(module); | |
1991 | if (!map) { | |
1992 | pr_err("Failed to find %s map.\n", (module) ? : "kernel"); | |
1993 | return -EINVAL; | |
1994 | } | |
3c42258c MH |
1995 | available_func_filter = _filter; |
1996 | if (map__load(map, filter_available_functions)) { | |
e80711ca MH |
1997 | pr_err("Failed to load map.\n"); |
1998 | return -EINVAL; | |
1999 | } | |
2000 | if (!dso__sorted_by_name(map->dso, map->type)) | |
2001 | dso__sort_by_name(map->dso, map->type); | |
2002 | ||
2003 | dso__fprintf_symbols_by_name(map->dso, map->type, stdout); | |
2004 | return 0; | |
2005 | } |