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> | |
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" | |
7ca5989d | 45 | #include "debugfs.h" |
4b4da7f7 | 46 | #include "trace-event.h" /* For __unused */ |
50656eec | 47 | #include "probe-event.h" |
4235b045 | 48 | #include "probe-finder.h" |
50656eec MH |
49 | |
50 | #define MAX_CMDLEN 256 | |
51 | #define MAX_PROBE_ARGS 128 | |
52 | #define PERFPROBE_GROUP "probe" | |
53 | ||
f4d7da49 MH |
54 | bool probe_event_dry_run; /* Dry run flag */ |
55 | ||
146a1439 | 56 | #define semantic_error(msg ...) pr_err("Semantic error :" msg) |
50656eec | 57 | |
4de189fe | 58 | /* If there is no space to write, returns -E2BIG. */ |
84988450 MH |
59 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
60 | __attribute__((format(printf, 3, 4))); | |
61 | ||
4de189fe MH |
62 | static int e_snprintf(char *str, size_t size, const char *format, ...) |
63 | { | |
64 | int ret; | |
65 | va_list ap; | |
66 | va_start(ap, format); | |
67 | ret = vsnprintf(str, size, format, ap); | |
68 | va_end(ap); | |
69 | if (ret >= (int)size) | |
70 | ret = -E2BIG; | |
71 | return ret; | |
72 | } | |
73 | ||
4b4da7f7 | 74 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp); |
d28c6223 | 75 | static struct machine machine; |
e0faa8d3 | 76 | |
469b9b88 | 77 | /* Initialize symbol maps and path of vmlinux/modules */ |
146a1439 | 78 | static int init_vmlinux(void) |
e0faa8d3 | 79 | { |
146a1439 MH |
80 | int ret; |
81 | ||
e0faa8d3 MH |
82 | symbol_conf.sort_by_name = true; |
83 | if (symbol_conf.vmlinux_name == NULL) | |
84 | symbol_conf.try_vmlinux_path = true; | |
85 | else | |
86 | pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name); | |
146a1439 MH |
87 | ret = symbol__init(); |
88 | if (ret < 0) { | |
89 | pr_debug("Failed to init symbol map.\n"); | |
90 | goto out; | |
91 | } | |
e0faa8d3 | 92 | |
469b9b88 | 93 | ret = machine__init(&machine, "", HOST_KERNEL_ID); |
d28c6223 ACM |
94 | if (ret < 0) |
95 | goto out; | |
96 | ||
469b9b88 | 97 | if (machine__create_kernel_maps(&machine) < 0) { |
0e43e5d2 | 98 | pr_debug("machine__create_kernel_maps() failed.\n"); |
469b9b88 MH |
99 | goto out; |
100 | } | |
146a1439 MH |
101 | out: |
102 | if (ret < 0) | |
103 | pr_warning("Failed to init vmlinux path.\n"); | |
104 | return ret; | |
e0faa8d3 MH |
105 | } |
106 | ||
469b9b88 MH |
107 | static struct symbol *__find_kernel_function_by_name(const char *name, |
108 | struct map **mapp) | |
109 | { | |
110 | return machine__find_kernel_function_by_name(&machine, name, mapp, | |
111 | NULL); | |
112 | } | |
113 | ||
114 | const char *kernel_get_module_path(const char *module) | |
115 | { | |
116 | struct dso *dso; | |
fd930ff9 FBH |
117 | struct map *map; |
118 | const char *vmlinux_name; | |
469b9b88 MH |
119 | |
120 | if (module) { | |
121 | list_for_each_entry(dso, &machine.kernel_dsos, node) { | |
122 | if (strncmp(dso->short_name + 1, module, | |
123 | dso->short_name_len - 2) == 0) | |
124 | goto found; | |
125 | } | |
126 | pr_debug("Failed to find module %s.\n", module); | |
127 | return NULL; | |
fd930ff9 FBH |
128 | } |
129 | ||
130 | map = machine.vmlinux_maps[MAP__FUNCTION]; | |
131 | dso = map->dso; | |
132 | ||
133 | vmlinux_name = symbol_conf.vmlinux_name; | |
134 | if (vmlinux_name) { | |
135 | if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0) | |
136 | return NULL; | |
469b9b88 | 137 | } else { |
c3a34e06 | 138 | if (dso__load_vmlinux_path(dso, map, NULL) <= 0) { |
469b9b88 MH |
139 | pr_debug("Failed to load kernel map.\n"); |
140 | return NULL; | |
141 | } | |
142 | } | |
143 | found: | |
144 | return dso->long_name; | |
145 | } | |
146 | ||
4b4da7f7 | 147 | #ifdef DWARF_SUPPORT |
469b9b88 | 148 | static int open_vmlinux(const char *module) |
e0faa8d3 | 149 | { |
469b9b88 MH |
150 | const char *path = kernel_get_module_path(module); |
151 | if (!path) { | |
0e43e5d2 MH |
152 | pr_err("Failed to find path of %s module.\n", |
153 | module ?: "kernel"); | |
469b9b88 | 154 | return -ENOENT; |
e0faa8d3 | 155 | } |
469b9b88 MH |
156 | pr_debug("Try to open %s\n", path); |
157 | return open(path, O_RDONLY); | |
e0faa8d3 | 158 | } |
4b4da7f7 | 159 | |
0e60836b SD |
160 | /* |
161 | * Convert trace point to probe point with debuginfo | |
162 | * Currently only handles kprobes. | |
163 | */ | |
164 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, | |
469b9b88 | 165 | struct perf_probe_point *pp) |
4b4da7f7 MH |
166 | { |
167 | struct symbol *sym; | |
469b9b88 MH |
168 | struct map *map; |
169 | u64 addr; | |
170 | int ret = -ENOENT; | |
4b4da7f7 | 171 | |
469b9b88 | 172 | sym = __find_kernel_function_by_name(tp->symbol, &map); |
4b4da7f7 | 173 | if (sym) { |
469b9b88 MH |
174 | addr = map->unmap_ip(map, sym->start + tp->offset); |
175 | pr_debug("try to find %s+%ld@%llx\n", tp->symbol, | |
176 | tp->offset, addr); | |
177 | ret = find_perf_probe_point((unsigned long)addr, pp); | |
4b4da7f7 MH |
178 | } |
179 | if (ret <= 0) { | |
146a1439 MH |
180 | pr_debug("Failed to find corresponding probes from " |
181 | "debuginfo. Use kprobe event information.\n"); | |
02b95dad MH |
182 | pp->function = strdup(tp->symbol); |
183 | if (pp->function == NULL) | |
184 | return -ENOMEM; | |
4b4da7f7 MH |
185 | pp->offset = tp->offset; |
186 | } | |
187 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
188 | |
189 | return 0; | |
4b4da7f7 MH |
190 | } |
191 | ||
192 | /* Try to find perf_probe_event with debuginfo */ | |
0e60836b SD |
193 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
194 | struct probe_trace_event **tevs, | |
469b9b88 | 195 | int max_tevs, const char *module) |
4b4da7f7 MH |
196 | { |
197 | bool need_dwarf = perf_probe_event_need_dwarf(pev); | |
198 | int fd, ntevs; | |
199 | ||
469b9b88 | 200 | fd = open_vmlinux(module); |
4b4da7f7 | 201 | if (fd < 0) { |
146a1439 MH |
202 | if (need_dwarf) { |
203 | pr_warning("Failed to open debuginfo file.\n"); | |
204 | return fd; | |
205 | } | |
4b4da7f7 MH |
206 | pr_debug("Could not open vmlinux. Try to use symbols.\n"); |
207 | return 0; | |
208 | } | |
209 | ||
210 | /* Searching trace events corresponding to probe event */ | |
0e60836b | 211 | ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs); |
4b4da7f7 MH |
212 | close(fd); |
213 | ||
146a1439 | 214 | if (ntevs > 0) { /* Succeeded to find trace events */ |
0e60836b | 215 | pr_debug("find %d probe_trace_events.\n", ntevs); |
4b4da7f7 | 216 | return ntevs; |
146a1439 | 217 | } |
4b4da7f7 | 218 | |
146a1439 MH |
219 | if (ntevs == 0) { /* No error but failed to find probe point. */ |
220 | pr_warning("Probe point '%s' not found.\n", | |
221 | synthesize_perf_probe_point(&pev->point)); | |
222 | return -ENOENT; | |
223 | } | |
224 | /* Error path : ntevs < 0 */ | |
15eca306 MH |
225 | pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs); |
226 | if (ntevs == -EBADF) { | |
227 | pr_warning("Warning: No dwarf info found in the vmlinux - " | |
228 | "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n"); | |
229 | if (!need_dwarf) { | |
0e43e5d2 | 230 | pr_debug("Trying to use symbols.\n"); |
15eca306 MH |
231 | return 0; |
232 | } | |
4b4da7f7 | 233 | } |
15eca306 | 234 | return ntevs; |
4b4da7f7 MH |
235 | } |
236 | ||
7cf0b79e MH |
237 | /* |
238 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
239 | * and chop off leading directories that do not exist. Result is passed back as | |
240 | * a newly allocated path on success. | |
241 | * Return 0 if file was found and readable, -errno otherwise. | |
242 | */ | |
6a330a3c MH |
243 | static int get_real_path(const char *raw_path, const char *comp_dir, |
244 | char **new_path) | |
7cf0b79e | 245 | { |
6a330a3c MH |
246 | const char *prefix = symbol_conf.source_prefix; |
247 | ||
248 | if (!prefix) { | |
249 | if (raw_path[0] != '/' && comp_dir) | |
250 | /* If not an absolute path, try to use comp_dir */ | |
251 | prefix = comp_dir; | |
252 | else { | |
253 | if (access(raw_path, R_OK) == 0) { | |
254 | *new_path = strdup(raw_path); | |
255 | return 0; | |
256 | } else | |
257 | return -errno; | |
258 | } | |
7cf0b79e MH |
259 | } |
260 | ||
6a330a3c | 261 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); |
7cf0b79e MH |
262 | if (!*new_path) |
263 | return -ENOMEM; | |
264 | ||
265 | for (;;) { | |
6a330a3c | 266 | sprintf(*new_path, "%s/%s", prefix, raw_path); |
7cf0b79e MH |
267 | |
268 | if (access(*new_path, R_OK) == 0) | |
269 | return 0; | |
270 | ||
6a330a3c MH |
271 | if (!symbol_conf.source_prefix) |
272 | /* In case of searching comp_dir, don't retry */ | |
273 | return -errno; | |
274 | ||
7cf0b79e MH |
275 | switch (errno) { |
276 | case ENAMETOOLONG: | |
277 | case ENOENT: | |
278 | case EROFS: | |
279 | case EFAULT: | |
280 | raw_path = strchr(++raw_path, '/'); | |
281 | if (!raw_path) { | |
282 | free(*new_path); | |
283 | *new_path = NULL; | |
284 | return -ENOENT; | |
285 | } | |
286 | continue; | |
287 | ||
288 | default: | |
289 | free(*new_path); | |
290 | *new_path = NULL; | |
291 | return -errno; | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
4b4da7f7 MH |
296 | #define LINEBUF_SIZE 256 |
297 | #define NR_ADDITIONAL_LINES 2 | |
298 | ||
fde52dbd | 299 | static int __show_one_line(FILE *fp, int l, bool skip, bool show_num) |
4b4da7f7 MH |
300 | { |
301 | char buf[LINEBUF_SIZE]; | |
befe3414 FBH |
302 | const char *color = show_num ? "" : PERF_COLOR_BLUE; |
303 | const char *prefix = NULL; | |
4b4da7f7 | 304 | |
befe3414 | 305 | do { |
4b4da7f7 MH |
306 | if (fgets(buf, LINEBUF_SIZE, fp) == NULL) |
307 | goto error; | |
befe3414 FBH |
308 | if (skip) |
309 | continue; | |
310 | if (!prefix) { | |
311 | prefix = show_num ? "%7d " : " "; | |
312 | color_fprintf(stdout, color, prefix, l); | |
4b4da7f7 | 313 | } |
befe3414 FBH |
314 | color_fprintf(stdout, color, "%s", buf); |
315 | ||
316 | } while (strchr(buf, '\n') == NULL); | |
146a1439 | 317 | |
fde52dbd | 318 | return 1; |
4b4da7f7 | 319 | error: |
fde52dbd | 320 | if (ferror(fp)) { |
32b2b6ec | 321 | pr_warning("File read error: %s\n", strerror(errno)); |
fde52dbd FBH |
322 | return -1; |
323 | } | |
324 | return 0; | |
325 | } | |
146a1439 | 326 | |
fde52dbd FBH |
327 | static int _show_one_line(FILE *fp, int l, bool skip, bool show_num) |
328 | { | |
329 | int rv = __show_one_line(fp, l, skip, show_num); | |
330 | if (rv == 0) { | |
331 | pr_warning("Source file is shorter than expected.\n"); | |
332 | rv = -1; | |
333 | } | |
334 | return rv; | |
4b4da7f7 MH |
335 | } |
336 | ||
fde52dbd FBH |
337 | #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true) |
338 | #define show_one_line(f,l) _show_one_line(f,l,false,false) | |
339 | #define skip_one_line(f,l) _show_one_line(f,l,true,false) | |
340 | #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false) | |
341 | ||
4b4da7f7 MH |
342 | /* |
343 | * Show line-range always requires debuginfo to find source file and | |
344 | * line number. | |
345 | */ | |
469b9b88 | 346 | int show_line_range(struct line_range *lr, const char *module) |
4b4da7f7 | 347 | { |
d3b63d7a | 348 | int l = 1; |
4b4da7f7 MH |
349 | struct line_node *ln; |
350 | FILE *fp; | |
351 | int fd, ret; | |
7cf0b79e | 352 | char *tmp; |
4b4da7f7 MH |
353 | |
354 | /* Search a line range */ | |
146a1439 MH |
355 | ret = init_vmlinux(); |
356 | if (ret < 0) | |
357 | return ret; | |
358 | ||
469b9b88 | 359 | fd = open_vmlinux(module); |
146a1439 MH |
360 | if (fd < 0) { |
361 | pr_warning("Failed to open debuginfo file.\n"); | |
362 | return fd; | |
363 | } | |
364 | ||
4b4da7f7 | 365 | ret = find_line_range(fd, lr); |
4b4da7f7 | 366 | close(fd); |
146a1439 MH |
367 | if (ret == 0) { |
368 | pr_warning("Specified source line is not found.\n"); | |
369 | return -ENOENT; | |
370 | } else if (ret < 0) { | |
371 | pr_warning("Debuginfo analysis failed. (%d)\n", ret); | |
372 | return ret; | |
373 | } | |
4b4da7f7 | 374 | |
7cf0b79e MH |
375 | /* Convert source file path */ |
376 | tmp = lr->path; | |
6a330a3c | 377 | ret = get_real_path(tmp, lr->comp_dir, &lr->path); |
7cf0b79e MH |
378 | free(tmp); /* Free old path */ |
379 | if (ret < 0) { | |
380 | pr_warning("Failed to find source file. (%d)\n", ret); | |
381 | return ret; | |
382 | } | |
383 | ||
4b4da7f7 MH |
384 | setup_pager(); |
385 | ||
386 | if (lr->function) | |
387 | fprintf(stdout, "<%s:%d>\n", lr->function, | |
388 | lr->start - lr->offset); | |
389 | else | |
62c15fc4 | 390 | fprintf(stdout, "<%s:%d>\n", lr->path, lr->start); |
4b4da7f7 MH |
391 | |
392 | fp = fopen(lr->path, "r"); | |
146a1439 MH |
393 | if (fp == NULL) { |
394 | pr_warning("Failed to open %s: %s\n", lr->path, | |
395 | strerror(errno)); | |
396 | return -errno; | |
397 | } | |
4b4da7f7 | 398 | /* Skip to starting line number */ |
44b81e92 | 399 | while (l < lr->start) { |
fde52dbd | 400 | ret = skip_one_line(fp, l++); |
44b81e92 FBH |
401 | if (ret < 0) |
402 | goto end; | |
403 | } | |
4b4da7f7 MH |
404 | |
405 | list_for_each_entry(ln, &lr->line_list, list) { | |
44b81e92 | 406 | for (; ln->line > l; l++) { |
fde52dbd | 407 | ret = show_one_line(fp, l - lr->offset); |
44b81e92 FBH |
408 | if (ret < 0) |
409 | goto end; | |
410 | } | |
fde52dbd | 411 | ret = show_one_line_with_num(fp, l++ - lr->offset); |
146a1439 MH |
412 | if (ret < 0) |
413 | goto end; | |
4b4da7f7 MH |
414 | } |
415 | ||
416 | if (lr->end == INT_MAX) | |
417 | lr->end = l + NR_ADDITIONAL_LINES; | |
fde52dbd FBH |
418 | while (l <= lr->end) { |
419 | ret = show_one_line_or_eof(fp, l++ - lr->offset); | |
420 | if (ret <= 0) | |
44b81e92 FBH |
421 | break; |
422 | } | |
146a1439 | 423 | end: |
4b4da7f7 | 424 | fclose(fp); |
146a1439 | 425 | return ret; |
4b4da7f7 MH |
426 | } |
427 | ||
cf6eb489 | 428 | static int show_available_vars_at(int fd, struct perf_probe_event *pev, |
fb8c5a56 | 429 | int max_vls, bool externs) |
cf6eb489 MH |
430 | { |
431 | char *buf; | |
432 | int ret, i; | |
433 | struct str_node *node; | |
434 | struct variable_list *vls = NULL, *vl; | |
435 | ||
436 | buf = synthesize_perf_probe_point(&pev->point); | |
437 | if (!buf) | |
438 | return -EINVAL; | |
439 | pr_debug("Searching variables at %s\n", buf); | |
440 | ||
fb8c5a56 | 441 | ret = find_available_vars_at(fd, pev, &vls, max_vls, externs); |
cf6eb489 MH |
442 | if (ret > 0) { |
443 | /* Some variables were found */ | |
444 | fprintf(stdout, "Available variables at %s\n", buf); | |
445 | for (i = 0; i < ret; i++) { | |
446 | vl = &vls[i]; | |
447 | /* | |
448 | * A probe point might be converted to | |
449 | * several trace points. | |
450 | */ | |
451 | fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, | |
452 | vl->point.offset); | |
453 | free(vl->point.symbol); | |
454 | if (vl->vars) { | |
455 | strlist__for_each(node, vl->vars) | |
456 | fprintf(stdout, "\t\t%s\n", node->s); | |
457 | strlist__delete(vl->vars); | |
458 | } else | |
459 | fprintf(stdout, "(No variables)\n"); | |
460 | } | |
461 | free(vls); | |
462 | } else | |
463 | pr_err("Failed to find variables at %s (%d)\n", buf, ret); | |
464 | ||
465 | free(buf); | |
466 | return ret; | |
467 | } | |
468 | ||
469 | /* Show available variables on given probe point */ | |
470 | int show_available_vars(struct perf_probe_event *pevs, int npevs, | |
469b9b88 | 471 | int max_vls, const char *module, bool externs) |
cf6eb489 MH |
472 | { |
473 | int i, fd, ret = 0; | |
474 | ||
475 | ret = init_vmlinux(); | |
476 | if (ret < 0) | |
477 | return ret; | |
478 | ||
469b9b88 | 479 | fd = open_vmlinux(module); |
cf6eb489 | 480 | if (fd < 0) { |
0e43e5d2 | 481 | pr_warning("Failed to open debug information file.\n"); |
cf6eb489 MH |
482 | return fd; |
483 | } | |
484 | ||
485 | setup_pager(); | |
486 | ||
487 | for (i = 0; i < npevs && ret >= 0; i++) | |
fb8c5a56 | 488 | ret = show_available_vars_at(fd, &pevs[i], max_vls, externs); |
cf6eb489 MH |
489 | |
490 | close(fd); | |
491 | return ret; | |
492 | } | |
493 | ||
4b4da7f7 MH |
494 | #else /* !DWARF_SUPPORT */ |
495 | ||
0e60836b | 496 | static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, |
469b9b88 | 497 | struct perf_probe_point *pp) |
4b4da7f7 | 498 | { |
469b9b88 MH |
499 | struct symbol *sym; |
500 | ||
501 | sym = __find_kernel_function_by_name(tp->symbol, NULL); | |
502 | if (!sym) { | |
503 | pr_err("Failed to find symbol %s in kernel.\n", tp->symbol); | |
504 | return -ENOENT; | |
505 | } | |
02b95dad MH |
506 | pp->function = strdup(tp->symbol); |
507 | if (pp->function == NULL) | |
508 | return -ENOMEM; | |
4b4da7f7 MH |
509 | pp->offset = tp->offset; |
510 | pp->retprobe = tp->retprobe; | |
146a1439 MH |
511 | |
512 | return 0; | |
4b4da7f7 MH |
513 | } |
514 | ||
0e60836b SD |
515 | static int try_to_find_probe_trace_events(struct perf_probe_event *pev, |
516 | struct probe_trace_event **tevs __unused, | |
469b9b88 | 517 | int max_tevs __unused, const char *mod __unused) |
4b4da7f7 | 518 | { |
146a1439 MH |
519 | if (perf_probe_event_need_dwarf(pev)) { |
520 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
521 | return -ENOSYS; | |
522 | } | |
4b4da7f7 MH |
523 | return 0; |
524 | } | |
525 | ||
469b9b88 | 526 | int show_line_range(struct line_range *lr __unused, const char *module __unused) |
4b4da7f7 | 527 | { |
146a1439 MH |
528 | pr_warning("Debuginfo-analysis is not supported.\n"); |
529 | return -ENOSYS; | |
4b4da7f7 MH |
530 | } |
531 | ||
cf6eb489 | 532 | int show_available_vars(struct perf_probe_event *pevs __unused, |
469b9b88 MH |
533 | int npevs __unused, int max_vls __unused, |
534 | const char *module __unused, bool externs __unused) | |
cf6eb489 MH |
535 | { |
536 | pr_warning("Debuginfo-analysis is not supported.\n"); | |
537 | return -ENOSYS; | |
538 | } | |
e0faa8d3 MH |
539 | #endif |
540 | ||
21dd9ae5 FBH |
541 | static int parse_line_num(char **ptr, int *val, const char *what) |
542 | { | |
543 | const char *start = *ptr; | |
544 | ||
545 | errno = 0; | |
546 | *val = strtol(*ptr, ptr, 0); | |
547 | if (errno || *ptr == start) { | |
548 | semantic_error("'%s' is not a valid number.\n", what); | |
549 | return -EINVAL; | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
9d95b580 FBH |
554 | /* |
555 | * Stuff 'lr' according to the line range described by 'arg'. | |
556 | * The line range syntax is described by: | |
557 | * | |
558 | * SRC[:SLN[+NUM|-ELN]] | |
559 | * FNC[:SLN[+NUM|-ELN]] | |
560 | */ | |
146a1439 | 561 | int parse_line_range_desc(const char *arg, struct line_range *lr) |
631c9def | 562 | { |
21dd9ae5 FBH |
563 | char *range, *name = strdup(arg); |
564 | int err; | |
565 | ||
566 | if (!name) | |
567 | return -ENOMEM; | |
568 | ||
569 | lr->start = 0; | |
570 | lr->end = INT_MAX; | |
571 | ||
572 | range = strchr(name, ':'); | |
573 | if (range) { | |
574 | *range++ = '\0'; | |
575 | ||
576 | err = parse_line_num(&range, &lr->start, "start line"); | |
577 | if (err) | |
578 | goto err; | |
579 | ||
580 | if (*range == '+' || *range == '-') { | |
581 | const char c = *range++; | |
582 | ||
583 | err = parse_line_num(&range, &lr->end, "end line"); | |
584 | if (err) | |
585 | goto err; | |
586 | ||
587 | if (c == '+') { | |
588 | lr->end += lr->start; | |
589 | /* | |
590 | * Adjust the number of lines here. | |
591 | * If the number of lines == 1, the | |
592 | * the end of line should be equal to | |
593 | * the start of line. | |
594 | */ | |
595 | lr->end--; | |
596 | } | |
597 | } | |
9d95b580 | 598 | |
d3b63d7a | 599 | pr_debug("Line range is %d to %d\n", lr->start, lr->end); |
21dd9ae5 FBH |
600 | |
601 | err = -EINVAL; | |
d3b63d7a | 602 | if (lr->start > lr->end) { |
631c9def | 603 | semantic_error("Start line must be smaller" |
146a1439 | 604 | " than end line.\n"); |
21dd9ae5 | 605 | goto err; |
146a1439 | 606 | } |
21dd9ae5 FBH |
607 | if (*range != '\0') { |
608 | semantic_error("Tailing with invalid str '%s'.\n", range); | |
609 | goto err; | |
146a1439 | 610 | } |
d3b63d7a | 611 | } |
02b95dad | 612 | |
21dd9ae5 FBH |
613 | if (strchr(name, '.')) |
614 | lr->file = name; | |
631c9def | 615 | else |
21dd9ae5 | 616 | lr->function = name; |
146a1439 MH |
617 | |
618 | return 0; | |
21dd9ae5 FBH |
619 | err: |
620 | free(name); | |
621 | return err; | |
631c9def MH |
622 | } |
623 | ||
b7702a21 MH |
624 | /* Check the name is good for event/group */ |
625 | static bool check_event_name(const char *name) | |
626 | { | |
627 | if (!isalpha(*name) && *name != '_') | |
628 | return false; | |
629 | while (*++name != '\0') { | |
630 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
631 | return false; | |
632 | } | |
633 | return true; | |
634 | } | |
635 | ||
50656eec | 636 | /* Parse probepoint definition. */ |
146a1439 | 637 | static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev) |
50656eec | 638 | { |
4235b045 | 639 | struct perf_probe_point *pp = &pev->point; |
50656eec MH |
640 | char *ptr, *tmp; |
641 | char c, nc = 0; | |
642 | /* | |
643 | * <Syntax> | |
2a9c8c36 MH |
644 | * perf probe [EVENT=]SRC[:LN|;PTN] |
645 | * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT] | |
af663d75 MH |
646 | * |
647 | * TODO:Group name support | |
50656eec MH |
648 | */ |
649 | ||
2a9c8c36 MH |
650 | ptr = strpbrk(arg, ";=@+%"); |
651 | if (ptr && *ptr == '=') { /* Event name */ | |
af663d75 MH |
652 | *ptr = '\0'; |
653 | tmp = ptr + 1; | |
146a1439 MH |
654 | if (strchr(arg, ':')) { |
655 | semantic_error("Group name is not supported yet.\n"); | |
656 | return -ENOTSUP; | |
657 | } | |
658 | if (!check_event_name(arg)) { | |
b7702a21 | 659 | semantic_error("%s is bad for event name -it must " |
146a1439 MH |
660 | "follow C symbol-naming rule.\n", arg); |
661 | return -EINVAL; | |
662 | } | |
02b95dad MH |
663 | pev->event = strdup(arg); |
664 | if (pev->event == NULL) | |
665 | return -ENOMEM; | |
4235b045 | 666 | pev->group = NULL; |
af663d75 MH |
667 | arg = tmp; |
668 | } | |
669 | ||
2a9c8c36 | 670 | ptr = strpbrk(arg, ";:+@%"); |
50656eec MH |
671 | if (ptr) { |
672 | nc = *ptr; | |
673 | *ptr++ = '\0'; | |
674 | } | |
675 | ||
02b95dad MH |
676 | tmp = strdup(arg); |
677 | if (tmp == NULL) | |
678 | return -ENOMEM; | |
679 | ||
50656eec | 680 | /* Check arg is function or file and copy it */ |
02b95dad MH |
681 | if (strchr(tmp, '.')) /* File */ |
682 | pp->file = tmp; | |
50656eec | 683 | else /* Function */ |
02b95dad | 684 | pp->function = tmp; |
50656eec MH |
685 | |
686 | /* Parse other options */ | |
687 | while (ptr) { | |
688 | arg = ptr; | |
689 | c = nc; | |
2a9c8c36 | 690 | if (c == ';') { /* Lazy pattern must be the last part */ |
02b95dad MH |
691 | pp->lazy_line = strdup(arg); |
692 | if (pp->lazy_line == NULL) | |
693 | return -ENOMEM; | |
2a9c8c36 MH |
694 | break; |
695 | } | |
696 | ptr = strpbrk(arg, ";:+@%"); | |
50656eec MH |
697 | if (ptr) { |
698 | nc = *ptr; | |
699 | *ptr++ = '\0'; | |
700 | } | |
701 | switch (c) { | |
702 | case ':': /* Line number */ | |
703 | pp->line = strtoul(arg, &tmp, 0); | |
146a1439 | 704 | if (*tmp != '\0') { |
2a9c8c36 | 705 | semantic_error("There is non-digit char" |
146a1439 MH |
706 | " in line number.\n"); |
707 | return -EINVAL; | |
708 | } | |
50656eec MH |
709 | break; |
710 | case '+': /* Byte offset from a symbol */ | |
711 | pp->offset = strtoul(arg, &tmp, 0); | |
146a1439 | 712 | if (*tmp != '\0') { |
2a9c8c36 | 713 | semantic_error("There is non-digit character" |
146a1439 MH |
714 | " in offset.\n"); |
715 | return -EINVAL; | |
716 | } | |
50656eec MH |
717 | break; |
718 | case '@': /* File name */ | |
146a1439 MH |
719 | if (pp->file) { |
720 | semantic_error("SRC@SRC is not allowed.\n"); | |
721 | return -EINVAL; | |
722 | } | |
02b95dad MH |
723 | pp->file = strdup(arg); |
724 | if (pp->file == NULL) | |
725 | return -ENOMEM; | |
50656eec MH |
726 | break; |
727 | case '%': /* Probe places */ | |
728 | if (strcmp(arg, "return") == 0) { | |
729 | pp->retprobe = 1; | |
146a1439 MH |
730 | } else { /* Others not supported yet */ |
731 | semantic_error("%%%s is not supported.\n", arg); | |
732 | return -ENOTSUP; | |
733 | } | |
50656eec | 734 | break; |
146a1439 MH |
735 | default: /* Buggy case */ |
736 | pr_err("This program has a bug at %s:%d.\n", | |
737 | __FILE__, __LINE__); | |
738 | return -ENOTSUP; | |
50656eec MH |
739 | break; |
740 | } | |
741 | } | |
742 | ||
743 | /* Exclusion check */ | |
146a1439 | 744 | if (pp->lazy_line && pp->line) { |
0e43e5d2 MH |
745 | semantic_error("Lazy pattern can't be used with" |
746 | " line number.\n"); | |
146a1439 MH |
747 | return -EINVAL; |
748 | } | |
2a9c8c36 | 749 | |
146a1439 | 750 | if (pp->lazy_line && pp->offset) { |
0e43e5d2 | 751 | semantic_error("Lazy pattern can't be used with offset.\n"); |
146a1439 MH |
752 | return -EINVAL; |
753 | } | |
2a9c8c36 | 754 | |
146a1439 | 755 | if (pp->line && pp->offset) { |
0e43e5d2 | 756 | semantic_error("Offset can't be used with line number.\n"); |
146a1439 MH |
757 | return -EINVAL; |
758 | } | |
50656eec | 759 | |
146a1439 | 760 | if (!pp->line && !pp->lazy_line && pp->file && !pp->function) { |
2a9c8c36 | 761 | semantic_error("File always requires line number or " |
0e43e5d2 | 762 | "lazy pattern.\n"); |
146a1439 MH |
763 | return -EINVAL; |
764 | } | |
50656eec | 765 | |
146a1439 | 766 | if (pp->offset && !pp->function) { |
0e43e5d2 | 767 | semantic_error("Offset requires an entry function.\n"); |
146a1439 MH |
768 | return -EINVAL; |
769 | } | |
50656eec | 770 | |
146a1439 | 771 | if (pp->retprobe && !pp->function) { |
0e43e5d2 | 772 | semantic_error("Return probe requires an entry function.\n"); |
146a1439 MH |
773 | return -EINVAL; |
774 | } | |
50656eec | 775 | |
146a1439 | 776 | if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) { |
2a9c8c36 | 777 | semantic_error("Offset/Line/Lazy pattern can't be used with " |
0e43e5d2 | 778 | "return probe.\n"); |
146a1439 MH |
779 | return -EINVAL; |
780 | } | |
50656eec | 781 | |
4235b045 | 782 | pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n", |
2a9c8c36 MH |
783 | pp->function, pp->file, pp->line, pp->offset, pp->retprobe, |
784 | pp->lazy_line); | |
146a1439 | 785 | return 0; |
50656eec MH |
786 | } |
787 | ||
7df2f329 | 788 | /* Parse perf-probe event argument */ |
146a1439 | 789 | static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg) |
7df2f329 | 790 | { |
b2a3c12b | 791 | char *tmp, *goodname; |
7df2f329 MH |
792 | struct perf_probe_arg_field **fieldp; |
793 | ||
794 | pr_debug("parsing arg: %s into ", str); | |
795 | ||
48481938 MH |
796 | tmp = strchr(str, '='); |
797 | if (tmp) { | |
02b95dad MH |
798 | arg->name = strndup(str, tmp - str); |
799 | if (arg->name == NULL) | |
800 | return -ENOMEM; | |
11a1ca35 | 801 | pr_debug("name:%s ", arg->name); |
48481938 MH |
802 | str = tmp + 1; |
803 | } | |
804 | ||
11a1ca35 MH |
805 | tmp = strchr(str, ':'); |
806 | if (tmp) { /* Type setting */ | |
807 | *tmp = '\0'; | |
02b95dad MH |
808 | arg->type = strdup(tmp + 1); |
809 | if (arg->type == NULL) | |
810 | return -ENOMEM; | |
11a1ca35 MH |
811 | pr_debug("type:%s ", arg->type); |
812 | } | |
813 | ||
b2a3c12b | 814 | tmp = strpbrk(str, "-.["); |
7df2f329 MH |
815 | if (!is_c_varname(str) || !tmp) { |
816 | /* A variable, register, symbol or special value */ | |
02b95dad MH |
817 | arg->var = strdup(str); |
818 | if (arg->var == NULL) | |
819 | return -ENOMEM; | |
48481938 | 820 | pr_debug("%s\n", arg->var); |
146a1439 | 821 | return 0; |
7df2f329 MH |
822 | } |
823 | ||
b2a3c12b | 824 | /* Structure fields or array element */ |
02b95dad MH |
825 | arg->var = strndup(str, tmp - str); |
826 | if (arg->var == NULL) | |
827 | return -ENOMEM; | |
b2a3c12b | 828 | goodname = arg->var; |
48481938 | 829 | pr_debug("%s, ", arg->var); |
7df2f329 MH |
830 | fieldp = &arg->field; |
831 | ||
832 | do { | |
e334016f MH |
833 | *fieldp = zalloc(sizeof(struct perf_probe_arg_field)); |
834 | if (*fieldp == NULL) | |
835 | return -ENOMEM; | |
b2a3c12b MH |
836 | if (*tmp == '[') { /* Array */ |
837 | str = tmp; | |
838 | (*fieldp)->index = strtol(str + 1, &tmp, 0); | |
7df2f329 | 839 | (*fieldp)->ref = true; |
b2a3c12b MH |
840 | if (*tmp != ']' || tmp == str + 1) { |
841 | semantic_error("Array index must be a" | |
842 | " number.\n"); | |
843 | return -EINVAL; | |
844 | } | |
845 | tmp++; | |
846 | if (*tmp == '\0') | |
847 | tmp = NULL; | |
848 | } else { /* Structure */ | |
849 | if (*tmp == '.') { | |
850 | str = tmp + 1; | |
851 | (*fieldp)->ref = false; | |
852 | } else if (tmp[1] == '>') { | |
853 | str = tmp + 2; | |
854 | (*fieldp)->ref = true; | |
855 | } else { | |
856 | semantic_error("Argument parse error: %s\n", | |
857 | str); | |
858 | return -EINVAL; | |
859 | } | |
860 | tmp = strpbrk(str, "-.["); | |
146a1439 | 861 | } |
7df2f329 | 862 | if (tmp) { |
02b95dad MH |
863 | (*fieldp)->name = strndup(str, tmp - str); |
864 | if ((*fieldp)->name == NULL) | |
865 | return -ENOMEM; | |
b2a3c12b MH |
866 | if (*str != '[') |
867 | goodname = (*fieldp)->name; | |
7df2f329 MH |
868 | pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref); |
869 | fieldp = &(*fieldp)->next; | |
870 | } | |
871 | } while (tmp); | |
02b95dad MH |
872 | (*fieldp)->name = strdup(str); |
873 | if ((*fieldp)->name == NULL) | |
874 | return -ENOMEM; | |
b2a3c12b MH |
875 | if (*str != '[') |
876 | goodname = (*fieldp)->name; | |
7df2f329 | 877 | pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref); |
df0faf4b | 878 | |
b2a3c12b | 879 | /* If no name is specified, set the last field name (not array index)*/ |
02b95dad | 880 | if (!arg->name) { |
b2a3c12b | 881 | arg->name = strdup(goodname); |
02b95dad MH |
882 | if (arg->name == NULL) |
883 | return -ENOMEM; | |
884 | } | |
146a1439 | 885 | return 0; |
7df2f329 MH |
886 | } |
887 | ||
4235b045 | 888 | /* Parse perf-probe event command */ |
146a1439 | 889 | int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev) |
50656eec | 890 | { |
e1c01d61 | 891 | char **argv; |
146a1439 | 892 | int argc, i, ret = 0; |
fac13fd5 | 893 | |
4235b045 | 894 | argv = argv_split(cmd, &argc); |
146a1439 MH |
895 | if (!argv) { |
896 | pr_debug("Failed to split arguments.\n"); | |
897 | return -ENOMEM; | |
898 | } | |
899 | if (argc - 1 > MAX_PROBE_ARGS) { | |
900 | semantic_error("Too many probe arguments (%d).\n", argc - 1); | |
901 | ret = -ERANGE; | |
902 | goto out; | |
903 | } | |
50656eec | 904 | /* Parse probe point */ |
146a1439 MH |
905 | ret = parse_perf_probe_point(argv[0], pev); |
906 | if (ret < 0) | |
907 | goto out; | |
50656eec | 908 | |
e1c01d61 | 909 | /* Copy arguments and ensure return probe has no C argument */ |
4235b045 | 910 | pev->nargs = argc - 1; |
e334016f MH |
911 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
912 | if (pev->args == NULL) { | |
913 | ret = -ENOMEM; | |
914 | goto out; | |
915 | } | |
146a1439 MH |
916 | for (i = 0; i < pev->nargs && ret >= 0; i++) { |
917 | ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]); | |
918 | if (ret >= 0 && | |
919 | is_c_varname(pev->args[i].var) && pev->point.retprobe) { | |
4235b045 | 920 | semantic_error("You can't specify local variable for" |
146a1439 MH |
921 | " kretprobe.\n"); |
922 | ret = -EINVAL; | |
923 | } | |
e1c01d61 | 924 | } |
146a1439 | 925 | out: |
e1c01d61 | 926 | argv_free(argv); |
146a1439 MH |
927 | |
928 | return ret; | |
50656eec MH |
929 | } |
930 | ||
4235b045 MH |
931 | /* Return true if this perf_probe_event requires debuginfo */ |
932 | bool perf_probe_event_need_dwarf(struct perf_probe_event *pev) | |
933 | { | |
934 | int i; | |
935 | ||
936 | if (pev->point.file || pev->point.line || pev->point.lazy_line) | |
937 | return true; | |
938 | ||
939 | for (i = 0; i < pev->nargs; i++) | |
48481938 | 940 | if (is_c_varname(pev->args[i].var)) |
4235b045 MH |
941 | return true; |
942 | ||
943 | return false; | |
944 | } | |
945 | ||
0e60836b SD |
946 | /* Parse probe_events event into struct probe_point */ |
947 | static int parse_probe_trace_command(const char *cmd, | |
948 | struct probe_trace_event *tev) | |
4de189fe | 949 | { |
0e60836b | 950 | struct probe_trace_point *tp = &tev->point; |
4de189fe MH |
951 | char pr; |
952 | char *p; | |
953 | int ret, i, argc; | |
954 | char **argv; | |
955 | ||
0e60836b | 956 | pr_debug("Parsing probe_events: %s\n", cmd); |
4235b045 | 957 | argv = argv_split(cmd, &argc); |
146a1439 MH |
958 | if (!argv) { |
959 | pr_debug("Failed to split arguments.\n"); | |
960 | return -ENOMEM; | |
961 | } | |
962 | if (argc < 2) { | |
963 | semantic_error("Too few probe arguments.\n"); | |
964 | ret = -ERANGE; | |
965 | goto out; | |
966 | } | |
4de189fe MH |
967 | |
968 | /* Scan event and group name. */ | |
93aaa45a | 969 | ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]", |
4235b045 MH |
970 | &pr, (float *)(void *)&tev->group, |
971 | (float *)(void *)&tev->event); | |
146a1439 MH |
972 | if (ret != 3) { |
973 | semantic_error("Failed to parse event name: %s\n", argv[0]); | |
974 | ret = -EINVAL; | |
975 | goto out; | |
976 | } | |
4235b045 | 977 | pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr); |
4de189fe | 978 | |
4235b045 | 979 | tp->retprobe = (pr == 'r'); |
4de189fe MH |
980 | |
981 | /* Scan function name and offset */ | |
4235b045 MH |
982 | ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol, |
983 | &tp->offset); | |
4de189fe | 984 | if (ret == 1) |
4235b045 | 985 | tp->offset = 0; |
4de189fe | 986 | |
4235b045 | 987 | tev->nargs = argc - 2; |
0e60836b | 988 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
989 | if (tev->args == NULL) { |
990 | ret = -ENOMEM; | |
991 | goto out; | |
992 | } | |
4235b045 | 993 | for (i = 0; i < tev->nargs; i++) { |
4de189fe MH |
994 | p = strchr(argv[i + 2], '='); |
995 | if (p) /* We don't need which register is assigned. */ | |
4235b045 MH |
996 | *p++ = '\0'; |
997 | else | |
998 | p = argv[i + 2]; | |
02b95dad | 999 | tev->args[i].name = strdup(argv[i + 2]); |
4235b045 | 1000 | /* TODO: parse regs and offset */ |
02b95dad MH |
1001 | tev->args[i].value = strdup(p); |
1002 | if (tev->args[i].name == NULL || tev->args[i].value == NULL) { | |
1003 | ret = -ENOMEM; | |
1004 | goto out; | |
1005 | } | |
4de189fe | 1006 | } |
146a1439 MH |
1007 | ret = 0; |
1008 | out: | |
4de189fe | 1009 | argv_free(argv); |
146a1439 | 1010 | return ret; |
4de189fe MH |
1011 | } |
1012 | ||
7df2f329 MH |
1013 | /* Compose only probe arg */ |
1014 | int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len) | |
1015 | { | |
1016 | struct perf_probe_arg_field *field = pa->field; | |
1017 | int ret; | |
1018 | char *tmp = buf; | |
1019 | ||
48481938 MH |
1020 | if (pa->name && pa->var) |
1021 | ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var); | |
1022 | else | |
1023 | ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var); | |
7df2f329 MH |
1024 | if (ret <= 0) |
1025 | goto error; | |
1026 | tmp += ret; | |
1027 | len -= ret; | |
1028 | ||
1029 | while (field) { | |
b2a3c12b MH |
1030 | if (field->name[0] == '[') |
1031 | ret = e_snprintf(tmp, len, "%s", field->name); | |
1032 | else | |
1033 | ret = e_snprintf(tmp, len, "%s%s", | |
1034 | field->ref ? "->" : ".", field->name); | |
7df2f329 MH |
1035 | if (ret <= 0) |
1036 | goto error; | |
1037 | tmp += ret; | |
1038 | len -= ret; | |
1039 | field = field->next; | |
1040 | } | |
11a1ca35 MH |
1041 | |
1042 | if (pa->type) { | |
1043 | ret = e_snprintf(tmp, len, ":%s", pa->type); | |
1044 | if (ret <= 0) | |
1045 | goto error; | |
1046 | tmp += ret; | |
1047 | len -= ret; | |
1048 | } | |
1049 | ||
7df2f329 MH |
1050 | return tmp - buf; |
1051 | error: | |
0e43e5d2 | 1052 | pr_debug("Failed to synthesize perf probe argument: %s\n", |
146a1439 MH |
1053 | strerror(-ret)); |
1054 | return ret; | |
7df2f329 MH |
1055 | } |
1056 | ||
4235b045 MH |
1057 | /* Compose only probe point (not argument) */ |
1058 | static char *synthesize_perf_probe_point(struct perf_probe_point *pp) | |
4de189fe | 1059 | { |
fb1587d8 MH |
1060 | char *buf, *tmp; |
1061 | char offs[32] = "", line[32] = "", file[32] = ""; | |
1062 | int ret, len; | |
4de189fe | 1063 | |
e334016f MH |
1064 | buf = zalloc(MAX_CMDLEN); |
1065 | if (buf == NULL) { | |
1066 | ret = -ENOMEM; | |
1067 | goto error; | |
1068 | } | |
4de189fe | 1069 | if (pp->offset) { |
fb1587d8 | 1070 | ret = e_snprintf(offs, 32, "+%lu", pp->offset); |
4de189fe MH |
1071 | if (ret <= 0) |
1072 | goto error; | |
1073 | } | |
1074 | if (pp->line) { | |
fb1587d8 MH |
1075 | ret = e_snprintf(line, 32, ":%d", pp->line); |
1076 | if (ret <= 0) | |
1077 | goto error; | |
1078 | } | |
1079 | if (pp->file) { | |
32ae2ade FBH |
1080 | tmp = pp->file; |
1081 | len = strlen(tmp); | |
1082 | if (len > 30) { | |
1083 | tmp = strchr(pp->file + len - 30, '/'); | |
1084 | tmp = tmp ? tmp + 1 : pp->file + len - 30; | |
1085 | } | |
1086 | ret = e_snprintf(file, 32, "@%s", tmp); | |
4de189fe MH |
1087 | if (ret <= 0) |
1088 | goto error; | |
1089 | } | |
1090 | ||
1091 | if (pp->function) | |
fb1587d8 MH |
1092 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function, |
1093 | offs, pp->retprobe ? "%return" : "", line, | |
1094 | file); | |
4de189fe | 1095 | else |
fb1587d8 | 1096 | ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line); |
4235b045 MH |
1097 | if (ret <= 0) |
1098 | goto error; | |
1099 | ||
1100 | return buf; | |
7ef17aaf | 1101 | error: |
0e43e5d2 | 1102 | pr_debug("Failed to synthesize perf probe point: %s\n", |
146a1439 | 1103 | strerror(-ret)); |
e334016f MH |
1104 | if (buf) |
1105 | free(buf); | |
146a1439 | 1106 | return NULL; |
7ef17aaf MH |
1107 | } |
1108 | ||
4235b045 MH |
1109 | #if 0 |
1110 | char *synthesize_perf_probe_command(struct perf_probe_event *pev) | |
7ef17aaf MH |
1111 | { |
1112 | char *buf; | |
1113 | int i, len, ret; | |
1114 | ||
4235b045 MH |
1115 | buf = synthesize_perf_probe_point(&pev->point); |
1116 | if (!buf) | |
1117 | return NULL; | |
4de189fe | 1118 | |
4235b045 MH |
1119 | len = strlen(buf); |
1120 | for (i = 0; i < pev->nargs; i++) { | |
4de189fe | 1121 | ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s", |
4235b045 MH |
1122 | pev->args[i].name); |
1123 | if (ret <= 0) { | |
1124 | free(buf); | |
1125 | return NULL; | |
1126 | } | |
4de189fe MH |
1127 | len += ret; |
1128 | } | |
4de189fe | 1129 | |
4235b045 MH |
1130 | return buf; |
1131 | } | |
1132 | #endif | |
1133 | ||
0e60836b | 1134 | static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref, |
4235b045 MH |
1135 | char **buf, size_t *buflen, |
1136 | int depth) | |
1137 | { | |
1138 | int ret; | |
1139 | if (ref->next) { | |
0e60836b | 1140 | depth = __synthesize_probe_trace_arg_ref(ref->next, buf, |
4235b045 MH |
1141 | buflen, depth + 1); |
1142 | if (depth < 0) | |
1143 | goto out; | |
1144 | } | |
1145 | ||
1146 | ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset); | |
1147 | if (ret < 0) | |
1148 | depth = ret; | |
1149 | else { | |
1150 | *buf += ret; | |
1151 | *buflen -= ret; | |
1152 | } | |
1153 | out: | |
1154 | return depth; | |
4de189fe | 1155 | |
4de189fe MH |
1156 | } |
1157 | ||
0e60836b | 1158 | static int synthesize_probe_trace_arg(struct probe_trace_arg *arg, |
4235b045 | 1159 | char *buf, size_t buflen) |
50656eec | 1160 | { |
0e60836b | 1161 | struct probe_trace_arg_ref *ref = arg->ref; |
4235b045 MH |
1162 | int ret, depth = 0; |
1163 | char *tmp = buf; | |
1164 | ||
1165 | /* Argument name or separator */ | |
1166 | if (arg->name) | |
1167 | ret = e_snprintf(buf, buflen, " %s=", arg->name); | |
1168 | else | |
1169 | ret = e_snprintf(buf, buflen, " "); | |
1170 | if (ret < 0) | |
1171 | return ret; | |
1172 | buf += ret; | |
1173 | buflen -= ret; | |
1174 | ||
b7dcb857 MH |
1175 | /* Special case: @XXX */ |
1176 | if (arg->value[0] == '@' && arg->ref) | |
1177 | ref = ref->next; | |
1178 | ||
4235b045 | 1179 | /* Dereferencing arguments */ |
b7dcb857 | 1180 | if (ref) { |
0e60836b | 1181 | depth = __synthesize_probe_trace_arg_ref(ref, &buf, |
4235b045 MH |
1182 | &buflen, 1); |
1183 | if (depth < 0) | |
1184 | return depth; | |
1185 | } | |
1186 | ||
1187 | /* Print argument value */ | |
b7dcb857 MH |
1188 | if (arg->value[0] == '@' && arg->ref) |
1189 | ret = e_snprintf(buf, buflen, "%s%+ld", arg->value, | |
1190 | arg->ref->offset); | |
1191 | else | |
1192 | ret = e_snprintf(buf, buflen, "%s", arg->value); | |
4235b045 MH |
1193 | if (ret < 0) |
1194 | return ret; | |
1195 | buf += ret; | |
1196 | buflen -= ret; | |
1197 | ||
1198 | /* Closing */ | |
1199 | while (depth--) { | |
1200 | ret = e_snprintf(buf, buflen, ")"); | |
1201 | if (ret < 0) | |
1202 | return ret; | |
1203 | buf += ret; | |
1204 | buflen -= ret; | |
1205 | } | |
4984912e MH |
1206 | /* Print argument type */ |
1207 | if (arg->type) { | |
1208 | ret = e_snprintf(buf, buflen, ":%s", arg->type); | |
1209 | if (ret <= 0) | |
1210 | return ret; | |
1211 | buf += ret; | |
1212 | } | |
4235b045 MH |
1213 | |
1214 | return buf - tmp; | |
1215 | } | |
1216 | ||
0e60836b | 1217 | char *synthesize_probe_trace_command(struct probe_trace_event *tev) |
4235b045 | 1218 | { |
0e60836b | 1219 | struct probe_trace_point *tp = &tev->point; |
50656eec MH |
1220 | char *buf; |
1221 | int i, len, ret; | |
1222 | ||
e334016f MH |
1223 | buf = zalloc(MAX_CMDLEN); |
1224 | if (buf == NULL) | |
1225 | return NULL; | |
1226 | ||
4235b045 MH |
1227 | len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu", |
1228 | tp->retprobe ? 'r' : 'p', | |
1229 | tev->group, tev->event, | |
1230 | tp->symbol, tp->offset); | |
1231 | if (len <= 0) | |
50656eec | 1232 | goto error; |
50656eec | 1233 | |
4235b045 | 1234 | for (i = 0; i < tev->nargs; i++) { |
0e60836b | 1235 | ret = synthesize_probe_trace_arg(&tev->args[i], buf + len, |
4235b045 | 1236 | MAX_CMDLEN - len); |
4de189fe | 1237 | if (ret <= 0) |
50656eec MH |
1238 | goto error; |
1239 | len += ret; | |
1240 | } | |
50656eec | 1241 | |
4235b045 | 1242 | return buf; |
50656eec | 1243 | error: |
4235b045 MH |
1244 | free(buf); |
1245 | return NULL; | |
1246 | } | |
50656eec | 1247 | |
0e60836b | 1248 | static int convert_to_perf_probe_event(struct probe_trace_event *tev, |
469b9b88 | 1249 | struct perf_probe_event *pev) |
4235b045 | 1250 | { |
02b95dad | 1251 | char buf[64] = ""; |
146a1439 | 1252 | int i, ret; |
4235b045 | 1253 | |
4b4da7f7 | 1254 | /* Convert event/group name */ |
02b95dad MH |
1255 | pev->event = strdup(tev->event); |
1256 | pev->group = strdup(tev->group); | |
1257 | if (pev->event == NULL || pev->group == NULL) | |
1258 | return -ENOMEM; | |
fb1587d8 | 1259 | |
4b4da7f7 | 1260 | /* Convert trace_point to probe_point */ |
0e60836b | 1261 | ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point); |
146a1439 MH |
1262 | if (ret < 0) |
1263 | return ret; | |
4b4da7f7 | 1264 | |
4235b045 MH |
1265 | /* Convert trace_arg to probe_arg */ |
1266 | pev->nargs = tev->nargs; | |
e334016f MH |
1267 | pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs); |
1268 | if (pev->args == NULL) | |
1269 | return -ENOMEM; | |
02b95dad | 1270 | for (i = 0; i < tev->nargs && ret >= 0; i++) { |
4235b045 | 1271 | if (tev->args[i].name) |
02b95dad | 1272 | pev->args[i].name = strdup(tev->args[i].name); |
4235b045 | 1273 | else { |
0e60836b | 1274 | ret = synthesize_probe_trace_arg(&tev->args[i], |
146a1439 | 1275 | buf, 64); |
02b95dad | 1276 | pev->args[i].name = strdup(buf); |
4235b045 | 1277 | } |
02b95dad MH |
1278 | if (pev->args[i].name == NULL && ret >= 0) |
1279 | ret = -ENOMEM; | |
1280 | } | |
146a1439 MH |
1281 | |
1282 | if (ret < 0) | |
1283 | clear_perf_probe_event(pev); | |
1284 | ||
1285 | return ret; | |
4235b045 MH |
1286 | } |
1287 | ||
1288 | void clear_perf_probe_event(struct perf_probe_event *pev) | |
1289 | { | |
1290 | struct perf_probe_point *pp = &pev->point; | |
7df2f329 | 1291 | struct perf_probe_arg_field *field, *next; |
4235b045 MH |
1292 | int i; |
1293 | ||
1294 | if (pev->event) | |
1295 | free(pev->event); | |
1296 | if (pev->group) | |
1297 | free(pev->group); | |
1298 | if (pp->file) | |
1299 | free(pp->file); | |
1300 | if (pp->function) | |
1301 | free(pp->function); | |
1302 | if (pp->lazy_line) | |
1303 | free(pp->lazy_line); | |
7df2f329 | 1304 | for (i = 0; i < pev->nargs; i++) { |
4235b045 MH |
1305 | if (pev->args[i].name) |
1306 | free(pev->args[i].name); | |
48481938 MH |
1307 | if (pev->args[i].var) |
1308 | free(pev->args[i].var); | |
11a1ca35 MH |
1309 | if (pev->args[i].type) |
1310 | free(pev->args[i].type); | |
7df2f329 MH |
1311 | field = pev->args[i].field; |
1312 | while (field) { | |
1313 | next = field->next; | |
1314 | if (field->name) | |
1315 | free(field->name); | |
1316 | free(field); | |
1317 | field = next; | |
1318 | } | |
1319 | } | |
4235b045 MH |
1320 | if (pev->args) |
1321 | free(pev->args); | |
1322 | memset(pev, 0, sizeof(*pev)); | |
1323 | } | |
1324 | ||
0e60836b | 1325 | static void clear_probe_trace_event(struct probe_trace_event *tev) |
4235b045 | 1326 | { |
0e60836b | 1327 | struct probe_trace_arg_ref *ref, *next; |
4235b045 MH |
1328 | int i; |
1329 | ||
1330 | if (tev->event) | |
1331 | free(tev->event); | |
1332 | if (tev->group) | |
1333 | free(tev->group); | |
1334 | if (tev->point.symbol) | |
1335 | free(tev->point.symbol); | |
1336 | for (i = 0; i < tev->nargs; i++) { | |
1337 | if (tev->args[i].name) | |
1338 | free(tev->args[i].name); | |
1339 | if (tev->args[i].value) | |
1340 | free(tev->args[i].value); | |
4984912e MH |
1341 | if (tev->args[i].type) |
1342 | free(tev->args[i].type); | |
4235b045 MH |
1343 | ref = tev->args[i].ref; |
1344 | while (ref) { | |
1345 | next = ref->next; | |
1346 | free(ref); | |
1347 | ref = next; | |
1348 | } | |
1349 | } | |
1350 | if (tev->args) | |
1351 | free(tev->args); | |
1352 | memset(tev, 0, sizeof(*tev)); | |
50656eec MH |
1353 | } |
1354 | ||
f4d7da49 | 1355 | static int open_kprobe_events(bool readwrite) |
4de189fe MH |
1356 | { |
1357 | char buf[PATH_MAX]; | |
7ca5989d | 1358 | const char *__debugfs; |
4de189fe MH |
1359 | int ret; |
1360 | ||
7ca5989d MH |
1361 | __debugfs = debugfs_find_mountpoint(); |
1362 | if (__debugfs == NULL) { | |
1363 | pr_warning("Debugfs is not mounted.\n"); | |
1364 | return -ENOENT; | |
1365 | } | |
1366 | ||
1367 | ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs); | |
146a1439 | 1368 | if (ret >= 0) { |
7ca5989d | 1369 | pr_debug("Opening %s write=%d\n", buf, readwrite); |
146a1439 MH |
1370 | if (readwrite && !probe_event_dry_run) |
1371 | ret = open(buf, O_RDWR, O_APPEND); | |
1372 | else | |
1373 | ret = open(buf, O_RDONLY, 0); | |
1374 | } | |
f4d7da49 | 1375 | |
4de189fe MH |
1376 | if (ret < 0) { |
1377 | if (errno == ENOENT) | |
146a1439 MH |
1378 | pr_warning("kprobe_events file does not exist - please" |
1379 | " rebuild kernel with CONFIG_KPROBE_EVENT.\n"); | |
4de189fe | 1380 | else |
146a1439 MH |
1381 | pr_warning("Failed to open kprobe_events file: %s\n", |
1382 | strerror(errno)); | |
4de189fe MH |
1383 | } |
1384 | return ret; | |
1385 | } | |
1386 | ||
1387 | /* Get raw string list of current kprobe_events */ | |
0e60836b | 1388 | static struct strlist *get_probe_trace_command_rawlist(int fd) |
4de189fe MH |
1389 | { |
1390 | int ret, idx; | |
1391 | FILE *fp; | |
1392 | char buf[MAX_CMDLEN]; | |
1393 | char *p; | |
1394 | struct strlist *sl; | |
1395 | ||
1396 | sl = strlist__new(true, NULL); | |
1397 | ||
1398 | fp = fdopen(dup(fd), "r"); | |
1399 | while (!feof(fp)) { | |
1400 | p = fgets(buf, MAX_CMDLEN, fp); | |
1401 | if (!p) | |
1402 | break; | |
1403 | ||
1404 | idx = strlen(p) - 1; | |
1405 | if (p[idx] == '\n') | |
1406 | p[idx] = '\0'; | |
1407 | ret = strlist__add(sl, buf); | |
146a1439 MH |
1408 | if (ret < 0) { |
1409 | pr_debug("strlist__add failed: %s\n", strerror(-ret)); | |
1410 | strlist__delete(sl); | |
1411 | return NULL; | |
1412 | } | |
4de189fe MH |
1413 | } |
1414 | fclose(fp); | |
1415 | ||
1416 | return sl; | |
1417 | } | |
1418 | ||
278498d4 | 1419 | /* Show an event */ |
146a1439 | 1420 | static int show_perf_probe_event(struct perf_probe_event *pev) |
278498d4 | 1421 | { |
7e990a51 | 1422 | int i, ret; |
278498d4 | 1423 | char buf[128]; |
4235b045 | 1424 | char *place; |
278498d4 | 1425 | |
4235b045 MH |
1426 | /* Synthesize only event probe point */ |
1427 | place = synthesize_perf_probe_point(&pev->point); | |
146a1439 MH |
1428 | if (!place) |
1429 | return -EINVAL; | |
4235b045 MH |
1430 | |
1431 | ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event); | |
7e990a51 | 1432 | if (ret < 0) |
146a1439 MH |
1433 | return ret; |
1434 | ||
fb1587d8 | 1435 | printf(" %-20s (on %s", buf, place); |
278498d4 | 1436 | |
4235b045 | 1437 | if (pev->nargs > 0) { |
278498d4 | 1438 | printf(" with"); |
7df2f329 | 1439 | for (i = 0; i < pev->nargs; i++) { |
146a1439 MH |
1440 | ret = synthesize_perf_probe_arg(&pev->args[i], |
1441 | buf, 128); | |
1442 | if (ret < 0) | |
1443 | break; | |
7df2f329 MH |
1444 | printf(" %s", buf); |
1445 | } | |
278498d4 MH |
1446 | } |
1447 | printf(")\n"); | |
4235b045 | 1448 | free(place); |
146a1439 | 1449 | return ret; |
278498d4 MH |
1450 | } |
1451 | ||
4de189fe | 1452 | /* List up current perf-probe events */ |
146a1439 | 1453 | int show_perf_probe_events(void) |
4de189fe | 1454 | { |
146a1439 | 1455 | int fd, ret; |
0e60836b | 1456 | struct probe_trace_event tev; |
4235b045 | 1457 | struct perf_probe_event pev; |
4de189fe MH |
1458 | struct strlist *rawlist; |
1459 | struct str_node *ent; | |
1460 | ||
72041334 | 1461 | setup_pager(); |
146a1439 MH |
1462 | ret = init_vmlinux(); |
1463 | if (ret < 0) | |
1464 | return ret; | |
4235b045 MH |
1465 | |
1466 | memset(&tev, 0, sizeof(tev)); | |
1467 | memset(&pev, 0, sizeof(pev)); | |
72041334 | 1468 | |
f4d7da49 | 1469 | fd = open_kprobe_events(false); |
146a1439 MH |
1470 | if (fd < 0) |
1471 | return fd; | |
1472 | ||
0e60836b | 1473 | rawlist = get_probe_trace_command_rawlist(fd); |
4de189fe | 1474 | close(fd); |
146a1439 MH |
1475 | if (!rawlist) |
1476 | return -ENOENT; | |
4de189fe | 1477 | |
adf365f4 | 1478 | strlist__for_each(ent, rawlist) { |
0e60836b | 1479 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1480 | if (ret >= 0) { |
1481 | ret = convert_to_perf_probe_event(&tev, &pev); | |
1482 | if (ret >= 0) | |
1483 | ret = show_perf_probe_event(&pev); | |
1484 | } | |
4235b045 | 1485 | clear_perf_probe_event(&pev); |
0e60836b | 1486 | clear_probe_trace_event(&tev); |
146a1439 MH |
1487 | if (ret < 0) |
1488 | break; | |
4de189fe | 1489 | } |
4de189fe | 1490 | strlist__delete(rawlist); |
146a1439 MH |
1491 | |
1492 | return ret; | |
4de189fe MH |
1493 | } |
1494 | ||
b498ce1f | 1495 | /* Get current perf-probe event names */ |
0e60836b | 1496 | static struct strlist *get_probe_trace_event_names(int fd, bool include_group) |
b498ce1f | 1497 | { |
fa28244d | 1498 | char buf[128]; |
b498ce1f MH |
1499 | struct strlist *sl, *rawlist; |
1500 | struct str_node *ent; | |
0e60836b | 1501 | struct probe_trace_event tev; |
146a1439 | 1502 | int ret = 0; |
b498ce1f | 1503 | |
4235b045 | 1504 | memset(&tev, 0, sizeof(tev)); |
0e60836b | 1505 | rawlist = get_probe_trace_command_rawlist(fd); |
e1d2017b | 1506 | sl = strlist__new(true, NULL); |
adf365f4 | 1507 | strlist__for_each(ent, rawlist) { |
0e60836b | 1508 | ret = parse_probe_trace_command(ent->s, &tev); |
146a1439 MH |
1509 | if (ret < 0) |
1510 | break; | |
fa28244d | 1511 | if (include_group) { |
146a1439 MH |
1512 | ret = e_snprintf(buf, 128, "%s:%s", tev.group, |
1513 | tev.event); | |
1514 | if (ret >= 0) | |
1515 | ret = strlist__add(sl, buf); | |
fa28244d | 1516 | } else |
146a1439 | 1517 | ret = strlist__add(sl, tev.event); |
0e60836b | 1518 | clear_probe_trace_event(&tev); |
146a1439 MH |
1519 | if (ret < 0) |
1520 | break; | |
b498ce1f | 1521 | } |
b498ce1f MH |
1522 | strlist__delete(rawlist); |
1523 | ||
146a1439 MH |
1524 | if (ret < 0) { |
1525 | strlist__delete(sl); | |
1526 | return NULL; | |
1527 | } | |
b498ce1f MH |
1528 | return sl; |
1529 | } | |
1530 | ||
0e60836b | 1531 | static int write_probe_trace_event(int fd, struct probe_trace_event *tev) |
50656eec | 1532 | { |
6eca8cc3 | 1533 | int ret = 0; |
0e60836b | 1534 | char *buf = synthesize_probe_trace_command(tev); |
50656eec | 1535 | |
146a1439 | 1536 | if (!buf) { |
0e60836b | 1537 | pr_debug("Failed to synthesize probe trace event.\n"); |
146a1439 MH |
1538 | return -EINVAL; |
1539 | } | |
1540 | ||
fa28244d | 1541 | pr_debug("Writing event: %s\n", buf); |
f4d7da49 MH |
1542 | if (!probe_event_dry_run) { |
1543 | ret = write(fd, buf, strlen(buf)); | |
1544 | if (ret <= 0) | |
146a1439 MH |
1545 | pr_warning("Failed to write event: %s\n", |
1546 | strerror(errno)); | |
f4d7da49 | 1547 | } |
4235b045 | 1548 | free(buf); |
146a1439 | 1549 | return ret; |
50656eec MH |
1550 | } |
1551 | ||
146a1439 MH |
1552 | static int get_new_event_name(char *buf, size_t len, const char *base, |
1553 | struct strlist *namelist, bool allow_suffix) | |
b498ce1f MH |
1554 | { |
1555 | int i, ret; | |
17f88fcd MH |
1556 | |
1557 | /* Try no suffix */ | |
1558 | ret = e_snprintf(buf, len, "%s", base); | |
146a1439 MH |
1559 | if (ret < 0) { |
1560 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1561 | return ret; | |
1562 | } | |
17f88fcd | 1563 | if (!strlist__has_entry(namelist, buf)) |
146a1439 | 1564 | return 0; |
17f88fcd | 1565 | |
d761b08b MH |
1566 | if (!allow_suffix) { |
1567 | pr_warning("Error: event \"%s\" already exists. " | |
1568 | "(Use -f to force duplicates.)\n", base); | |
146a1439 | 1569 | return -EEXIST; |
d761b08b MH |
1570 | } |
1571 | ||
17f88fcd MH |
1572 | /* Try to add suffix */ |
1573 | for (i = 1; i < MAX_EVENT_INDEX; i++) { | |
b498ce1f | 1574 | ret = e_snprintf(buf, len, "%s_%d", base, i); |
146a1439 MH |
1575 | if (ret < 0) { |
1576 | pr_debug("snprintf() failed: %s\n", strerror(-ret)); | |
1577 | return ret; | |
1578 | } | |
b498ce1f MH |
1579 | if (!strlist__has_entry(namelist, buf)) |
1580 | break; | |
1581 | } | |
146a1439 MH |
1582 | if (i == MAX_EVENT_INDEX) { |
1583 | pr_warning("Too many events are on the same function.\n"); | |
1584 | ret = -ERANGE; | |
1585 | } | |
1586 | ||
1587 | return ret; | |
b498ce1f MH |
1588 | } |
1589 | ||
0e60836b SD |
1590 | static int __add_probe_trace_events(struct perf_probe_event *pev, |
1591 | struct probe_trace_event *tevs, | |
146a1439 | 1592 | int ntevs, bool allow_suffix) |
50656eec | 1593 | { |
146a1439 | 1594 | int i, fd, ret; |
0e60836b | 1595 | struct probe_trace_event *tev = NULL; |
4235b045 MH |
1596 | char buf[64]; |
1597 | const char *event, *group; | |
b498ce1f | 1598 | struct strlist *namelist; |
50656eec | 1599 | |
f4d7da49 | 1600 | fd = open_kprobe_events(true); |
146a1439 MH |
1601 | if (fd < 0) |
1602 | return fd; | |
b498ce1f | 1603 | /* Get current event names */ |
0e60836b | 1604 | namelist = get_probe_trace_event_names(fd, false); |
146a1439 MH |
1605 | if (!namelist) { |
1606 | pr_debug("Failed to get current event list.\n"); | |
1607 | return -EIO; | |
1608 | } | |
4235b045 | 1609 | |
146a1439 | 1610 | ret = 0; |
4235b045 | 1611 | printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":"); |
02b95dad | 1612 | for (i = 0; i < ntevs; i++) { |
4235b045 MH |
1613 | tev = &tevs[i]; |
1614 | if (pev->event) | |
1615 | event = pev->event; | |
1616 | else | |
1617 | if (pev->point.function) | |
1618 | event = pev->point.function; | |
1619 | else | |
1620 | event = tev->point.symbol; | |
1621 | if (pev->group) | |
1622 | group = pev->group; | |
1623 | else | |
1624 | group = PERFPROBE_GROUP; | |
1625 | ||
1626 | /* Get an unused new event name */ | |
146a1439 MH |
1627 | ret = get_new_event_name(buf, 64, event, |
1628 | namelist, allow_suffix); | |
1629 | if (ret < 0) | |
1630 | break; | |
4235b045 MH |
1631 | event = buf; |
1632 | ||
02b95dad MH |
1633 | tev->event = strdup(event); |
1634 | tev->group = strdup(group); | |
1635 | if (tev->event == NULL || tev->group == NULL) { | |
1636 | ret = -ENOMEM; | |
1637 | break; | |
1638 | } | |
0e60836b | 1639 | ret = write_probe_trace_event(fd, tev); |
146a1439 MH |
1640 | if (ret < 0) |
1641 | break; | |
4235b045 MH |
1642 | /* Add added event name to namelist */ |
1643 | strlist__add(namelist, event); | |
1644 | ||
1645 | /* Trick here - save current event/group */ | |
1646 | event = pev->event; | |
1647 | group = pev->group; | |
1648 | pev->event = tev->event; | |
1649 | pev->group = tev->group; | |
1650 | show_perf_probe_event(pev); | |
1651 | /* Trick here - restore current event/group */ | |
1652 | pev->event = (char *)event; | |
1653 | pev->group = (char *)group; | |
1654 | ||
1655 | /* | |
1656 | * Probes after the first probe which comes from same | |
1657 | * user input are always allowed to add suffix, because | |
1658 | * there might be several addresses corresponding to | |
1659 | * one code line. | |
1660 | */ | |
1661 | allow_suffix = true; | |
50656eec | 1662 | } |
146a1439 MH |
1663 | |
1664 | if (ret >= 0) { | |
1665 | /* Show how to use the event. */ | |
1666 | printf("\nYou can now use it on all perf tools, such as:\n\n"); | |
1667 | printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group, | |
1668 | tev->event); | |
1669 | } | |
a9b495b0 | 1670 | |
e1d2017b | 1671 | strlist__delete(namelist); |
50656eec | 1672 | close(fd); |
146a1439 | 1673 | return ret; |
50656eec | 1674 | } |
fa28244d | 1675 | |
0e60836b SD |
1676 | static int convert_to_probe_trace_events(struct perf_probe_event *pev, |
1677 | struct probe_trace_event **tevs, | |
469b9b88 | 1678 | int max_tevs, const char *module) |
e0faa8d3 MH |
1679 | { |
1680 | struct symbol *sym; | |
e334016f | 1681 | int ret = 0, i; |
0e60836b | 1682 | struct probe_trace_event *tev; |
4235b045 | 1683 | |
4b4da7f7 | 1684 | /* Convert perf_probe_event with debuginfo */ |
469b9b88 | 1685 | ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module); |
e334016f MH |
1686 | if (ret != 0) |
1687 | return ret; | |
e0faa8d3 | 1688 | |
4235b045 | 1689 | /* Allocate trace event buffer */ |
0e60836b | 1690 | tev = *tevs = zalloc(sizeof(struct probe_trace_event)); |
e334016f MH |
1691 | if (tev == NULL) |
1692 | return -ENOMEM; | |
4235b045 MH |
1693 | |
1694 | /* Copy parameters */ | |
02b95dad MH |
1695 | tev->point.symbol = strdup(pev->point.function); |
1696 | if (tev->point.symbol == NULL) { | |
1697 | ret = -ENOMEM; | |
1698 | goto error; | |
1699 | } | |
4235b045 | 1700 | tev->point.offset = pev->point.offset; |
04ddd04b | 1701 | tev->point.retprobe = pev->point.retprobe; |
4235b045 MH |
1702 | tev->nargs = pev->nargs; |
1703 | if (tev->nargs) { | |
0e60836b | 1704 | tev->args = zalloc(sizeof(struct probe_trace_arg) |
e334016f MH |
1705 | * tev->nargs); |
1706 | if (tev->args == NULL) { | |
02b95dad MH |
1707 | ret = -ENOMEM; |
1708 | goto error; | |
e334016f | 1709 | } |
48481938 | 1710 | for (i = 0; i < tev->nargs; i++) { |
02b95dad MH |
1711 | if (pev->args[i].name) { |
1712 | tev->args[i].name = strdup(pev->args[i].name); | |
1713 | if (tev->args[i].name == NULL) { | |
1714 | ret = -ENOMEM; | |
1715 | goto error; | |
1716 | } | |
1717 | } | |
1718 | tev->args[i].value = strdup(pev->args[i].var); | |
1719 | if (tev->args[i].value == NULL) { | |
1720 | ret = -ENOMEM; | |
1721 | goto error; | |
1722 | } | |
1723 | if (pev->args[i].type) { | |
1724 | tev->args[i].type = strdup(pev->args[i].type); | |
1725 | if (tev->args[i].type == NULL) { | |
1726 | ret = -ENOMEM; | |
1727 | goto error; | |
1728 | } | |
1729 | } | |
48481938 | 1730 | } |
4235b045 MH |
1731 | } |
1732 | ||
1733 | /* Currently just checking function name from symbol map */ | |
469b9b88 | 1734 | sym = __find_kernel_function_by_name(tev->point.symbol, NULL); |
146a1439 MH |
1735 | if (!sym) { |
1736 | pr_warning("Kernel symbol \'%s\' not found.\n", | |
1737 | tev->point.symbol); | |
02b95dad MH |
1738 | ret = -ENOENT; |
1739 | goto error; | |
1740 | } | |
e334016f | 1741 | |
02b95dad MH |
1742 | return 1; |
1743 | error: | |
0e60836b | 1744 | clear_probe_trace_event(tev); |
02b95dad MH |
1745 | free(tev); |
1746 | *tevs = NULL; | |
e334016f | 1747 | return ret; |
4235b045 MH |
1748 | } |
1749 | ||
1750 | struct __event_package { | |
1751 | struct perf_probe_event *pev; | |
0e60836b | 1752 | struct probe_trace_event *tevs; |
4235b045 MH |
1753 | int ntevs; |
1754 | }; | |
1755 | ||
146a1439 | 1756 | int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, |
469b9b88 | 1757 | int max_tevs, const char *module, bool force_add) |
4235b045 | 1758 | { |
146a1439 | 1759 | int i, j, ret; |
4235b045 MH |
1760 | struct __event_package *pkgs; |
1761 | ||
e334016f MH |
1762 | pkgs = zalloc(sizeof(struct __event_package) * npevs); |
1763 | if (pkgs == NULL) | |
1764 | return -ENOMEM; | |
4235b045 MH |
1765 | |
1766 | /* Init vmlinux path */ | |
146a1439 | 1767 | ret = init_vmlinux(); |
449e5b24 MH |
1768 | if (ret < 0) { |
1769 | free(pkgs); | |
146a1439 | 1770 | return ret; |
449e5b24 | 1771 | } |
4235b045 MH |
1772 | |
1773 | /* Loop 1: convert all events */ | |
1774 | for (i = 0; i < npevs; i++) { | |
1775 | pkgs[i].pev = &pevs[i]; | |
1776 | /* Convert with or without debuginfo */ | |
0e60836b | 1777 | ret = convert_to_probe_trace_events(pkgs[i].pev, |
469b9b88 MH |
1778 | &pkgs[i].tevs, |
1779 | max_tevs, | |
1780 | module); | |
146a1439 MH |
1781 | if (ret < 0) |
1782 | goto end; | |
1783 | pkgs[i].ntevs = ret; | |
e0faa8d3 MH |
1784 | } |
1785 | ||
4235b045 | 1786 | /* Loop 2: add all events */ |
146a1439 | 1787 | for (i = 0; i < npevs && ret >= 0; i++) |
0e60836b | 1788 | ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs, |
146a1439 MH |
1789 | pkgs[i].ntevs, force_add); |
1790 | end: | |
449e5b24 MH |
1791 | /* Loop 3: cleanup and free trace events */ |
1792 | for (i = 0; i < npevs; i++) { | |
146a1439 | 1793 | for (j = 0; j < pkgs[i].ntevs; j++) |
0e60836b | 1794 | clear_probe_trace_event(&pkgs[i].tevs[j]); |
449e5b24 MH |
1795 | free(pkgs[i].tevs); |
1796 | } | |
1797 | free(pkgs); | |
146a1439 MH |
1798 | |
1799 | return ret; | |
e0faa8d3 MH |
1800 | } |
1801 | ||
0e60836b | 1802 | static int __del_trace_probe_event(int fd, struct str_node *ent) |
bbbb521b MH |
1803 | { |
1804 | char *p; | |
1805 | char buf[128]; | |
4235b045 | 1806 | int ret; |
bbbb521b | 1807 | |
0e60836b | 1808 | /* Convert from perf-probe event to trace-probe event */ |
146a1439 MH |
1809 | ret = e_snprintf(buf, 128, "-:%s", ent->s); |
1810 | if (ret < 0) | |
1811 | goto error; | |
1812 | ||
bbbb521b | 1813 | p = strchr(buf + 2, ':'); |
146a1439 MH |
1814 | if (!p) { |
1815 | pr_debug("Internal error: %s should have ':' but not.\n", | |
1816 | ent->s); | |
1817 | ret = -ENOTSUP; | |
1818 | goto error; | |
1819 | } | |
bbbb521b MH |
1820 | *p = '/'; |
1821 | ||
4235b045 MH |
1822 | pr_debug("Writing event: %s\n", buf); |
1823 | ret = write(fd, buf, strlen(buf)); | |
146a1439 MH |
1824 | if (ret < 0) |
1825 | goto error; | |
1826 | ||
bbbb521b | 1827 | printf("Remove event: %s\n", ent->s); |
146a1439 MH |
1828 | return 0; |
1829 | error: | |
1830 | pr_warning("Failed to delete event: %s\n", strerror(-ret)); | |
1831 | return ret; | |
bbbb521b MH |
1832 | } |
1833 | ||
0e60836b | 1834 | static int del_trace_probe_event(int fd, const char *group, |
146a1439 | 1835 | const char *event, struct strlist *namelist) |
fa28244d MH |
1836 | { |
1837 | char buf[128]; | |
bbbb521b | 1838 | struct str_node *ent, *n; |
146a1439 | 1839 | int found = 0, ret = 0; |
fa28244d | 1840 | |
146a1439 MH |
1841 | ret = e_snprintf(buf, 128, "%s:%s", group, event); |
1842 | if (ret < 0) { | |
0e43e5d2 | 1843 | pr_err("Failed to copy event.\n"); |
146a1439 MH |
1844 | return ret; |
1845 | } | |
fa28244d | 1846 | |
bbbb521b MH |
1847 | if (strpbrk(buf, "*?")) { /* Glob-exp */ |
1848 | strlist__for_each_safe(ent, n, namelist) | |
1849 | if (strglobmatch(ent->s, buf)) { | |
1850 | found++; | |
0e60836b | 1851 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1852 | if (ret < 0) |
1853 | break; | |
bbbb521b MH |
1854 | strlist__remove(namelist, ent); |
1855 | } | |
1856 | } else { | |
1857 | ent = strlist__find(namelist, buf); | |
1858 | if (ent) { | |
1859 | found++; | |
0e60836b | 1860 | ret = __del_trace_probe_event(fd, ent); |
146a1439 MH |
1861 | if (ret >= 0) |
1862 | strlist__remove(namelist, ent); | |
bbbb521b MH |
1863 | } |
1864 | } | |
146a1439 MH |
1865 | if (found == 0 && ret >= 0) |
1866 | pr_info("Info: Event \"%s\" does not exist.\n", buf); | |
1867 | ||
1868 | return ret; | |
fa28244d MH |
1869 | } |
1870 | ||
146a1439 | 1871 | int del_perf_probe_events(struct strlist *dellist) |
fa28244d | 1872 | { |
146a1439 | 1873 | int fd, ret = 0; |
fa28244d MH |
1874 | const char *group, *event; |
1875 | char *p, *str; | |
1876 | struct str_node *ent; | |
1877 | struct strlist *namelist; | |
1878 | ||
f4d7da49 | 1879 | fd = open_kprobe_events(true); |
146a1439 MH |
1880 | if (fd < 0) |
1881 | return fd; | |
1882 | ||
fa28244d | 1883 | /* Get current event names */ |
0e60836b | 1884 | namelist = get_probe_trace_event_names(fd, true); |
146a1439 MH |
1885 | if (namelist == NULL) |
1886 | return -EINVAL; | |
fa28244d | 1887 | |
adf365f4 | 1888 | strlist__for_each(ent, dellist) { |
02b95dad MH |
1889 | str = strdup(ent->s); |
1890 | if (str == NULL) { | |
1891 | ret = -ENOMEM; | |
1892 | break; | |
1893 | } | |
bbbb521b | 1894 | pr_debug("Parsing: %s\n", str); |
fa28244d MH |
1895 | p = strchr(str, ':'); |
1896 | if (p) { | |
1897 | group = str; | |
1898 | *p = '\0'; | |
1899 | event = p + 1; | |
1900 | } else { | |
bbbb521b | 1901 | group = "*"; |
fa28244d MH |
1902 | event = str; |
1903 | } | |
bbbb521b | 1904 | pr_debug("Group: %s, Event: %s\n", group, event); |
0e60836b | 1905 | ret = del_trace_probe_event(fd, group, event, namelist); |
fa28244d | 1906 | free(str); |
146a1439 MH |
1907 | if (ret < 0) |
1908 | break; | |
fa28244d MH |
1909 | } |
1910 | strlist__delete(namelist); | |
1911 | close(fd); | |
146a1439 MH |
1912 | |
1913 | return ret; | |
fa28244d MH |
1914 | } |
1915 |