Commit | Line | Data |
---|---|---|
413d37d1 | 1 | /* |
77b44d1b | 2 | * Kprobes-based tracing events |
413d37d1 MH |
3 | * |
4 | * Created 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 version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/uaccess.h> | |
413d37d1 | 22 | |
8ab83f56 | 23 | #include "trace_probe.h" |
1ff511e3 | 24 | |
8ab83f56 | 25 | #define KPROBE_EVENT_SYSTEM "kprobes" |
e09c8614 | 26 | |
413d37d1 | 27 | /** |
77b44d1b | 28 | * Kprobe event core functions |
413d37d1 | 29 | */ |
c31ffb3f | 30 | struct trace_kprobe { |
413d37d1 | 31 | struct list_head list; |
4a846b44 | 32 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
cd7e7bd5 | 33 | unsigned long nhit; |
413d37d1 | 34 | const char *symbol; /* symbol name */ |
c31ffb3f | 35 | struct trace_probe tp; |
413d37d1 MH |
36 | }; |
37 | ||
b04d52e3 ON |
38 | struct event_file_link { |
39 | struct ftrace_event_file *file; | |
40 | struct list_head list; | |
41 | }; | |
42 | ||
c31ffb3f NK |
43 | #define SIZEOF_TRACE_KPROBE(n) \ |
44 | (offsetof(struct trace_kprobe, tp.args) + \ | |
eca0d916 | 45 | (sizeof(struct probe_arg) * (n))) |
a82378d8 | 46 | |
93ccae7a | 47 | |
c31ffb3f | 48 | static __kprobes bool trace_kprobe_is_return(struct trace_kprobe *tk) |
413d37d1 | 49 | { |
c31ffb3f | 50 | return tk->rp.handler != NULL; |
413d37d1 MH |
51 | } |
52 | ||
c31ffb3f | 53 | static __kprobes const char *trace_kprobe_symbol(struct trace_kprobe *tk) |
413d37d1 | 54 | { |
c31ffb3f | 55 | return tk->symbol ? tk->symbol : "unknown"; |
413d37d1 MH |
56 | } |
57 | ||
c31ffb3f | 58 | static __kprobes unsigned long trace_kprobe_offset(struct trace_kprobe *tk) |
61424318 | 59 | { |
c31ffb3f | 60 | return tk->rp.kp.offset; |
61424318 MH |
61 | } |
62 | ||
c31ffb3f | 63 | static __kprobes bool trace_kprobe_has_gone(struct trace_kprobe *tk) |
61424318 | 64 | { |
c31ffb3f | 65 | return !!(kprobe_gone(&tk->rp.kp)); |
61424318 MH |
66 | } |
67 | ||
c31ffb3f NK |
68 | static __kprobes bool trace_kprobe_within_module(struct trace_kprobe *tk, |
69 | struct module *mod) | |
61424318 MH |
70 | { |
71 | int len = strlen(mod->name); | |
c31ffb3f | 72 | const char *name = trace_kprobe_symbol(tk); |
61424318 MH |
73 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
74 | } | |
75 | ||
c31ffb3f | 76 | static __kprobes bool trace_kprobe_is_on_module(struct trace_kprobe *tk) |
61424318 | 77 | { |
c31ffb3f | 78 | return !!strchr(trace_kprobe_symbol(tk), ':'); |
61424318 MH |
79 | } |
80 | ||
c31ffb3f NK |
81 | static int register_kprobe_event(struct trace_kprobe *tk); |
82 | static int unregister_kprobe_event(struct trace_kprobe *tk); | |
413d37d1 MH |
83 | |
84 | static DEFINE_MUTEX(probe_lock); | |
85 | static LIST_HEAD(probe_list); | |
86 | ||
50d78056 MH |
87 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
88 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, | |
89 | struct pt_regs *regs); | |
90 | ||
1301a44e NK |
91 | /* Memory fetching by symbol */ |
92 | struct symbol_cache { | |
93 | char *symbol; | |
94 | long offset; | |
95 | unsigned long addr; | |
96 | }; | |
97 | ||
98 | unsigned long update_symbol_cache(struct symbol_cache *sc) | |
99 | { | |
100 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); | |
101 | ||
102 | if (sc->addr) | |
103 | sc->addr += sc->offset; | |
104 | ||
105 | return sc->addr; | |
106 | } | |
107 | ||
108 | void free_symbol_cache(struct symbol_cache *sc) | |
109 | { | |
110 | kfree(sc->symbol); | |
111 | kfree(sc); | |
112 | } | |
113 | ||
114 | struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) | |
115 | { | |
116 | struct symbol_cache *sc; | |
117 | ||
118 | if (!sym || strlen(sym) == 0) | |
119 | return NULL; | |
120 | ||
121 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); | |
122 | if (!sc) | |
123 | return NULL; | |
124 | ||
125 | sc->symbol = kstrdup(sym, GFP_KERNEL); | |
126 | if (!sc->symbol) { | |
127 | kfree(sc); | |
128 | return NULL; | |
129 | } | |
130 | sc->offset = offset; | |
131 | update_symbol_cache(sc); | |
132 | ||
133 | return sc; | |
134 | } | |
135 | ||
3fd996a2 NK |
136 | /* |
137 | * Kprobes-specific fetch functions | |
138 | */ | |
139 | #define DEFINE_FETCH_stack(type) \ | |
140 | static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\ | |
141 | void *offset, void *dest) \ | |
142 | { \ | |
143 | *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \ | |
144 | (unsigned int)((unsigned long)offset)); \ | |
145 | } | |
146 | DEFINE_BASIC_FETCH_FUNCS(stack) | |
147 | /* No string on the stack entry */ | |
148 | #define fetch_stack_string NULL | |
149 | #define fetch_stack_string_size NULL | |
150 | ||
5baaa59e NK |
151 | #define DEFINE_FETCH_memory(type) \ |
152 | static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\ | |
153 | void *addr, void *dest) \ | |
154 | { \ | |
155 | type retval; \ | |
156 | if (probe_kernel_address(addr, retval)) \ | |
157 | *(type *)dest = 0; \ | |
158 | else \ | |
159 | *(type *)dest = retval; \ | |
160 | } | |
161 | DEFINE_BASIC_FETCH_FUNCS(memory) | |
162 | /* | |
163 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
164 | * length and relative data location. | |
165 | */ | |
166 | static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, | |
167 | void *addr, void *dest) | |
168 | { | |
169 | long ret; | |
170 | int maxlen = get_rloc_len(*(u32 *)dest); | |
171 | u8 *dst = get_rloc_data(dest); | |
172 | u8 *src = addr; | |
173 | mm_segment_t old_fs = get_fs(); | |
174 | ||
175 | if (!maxlen) | |
176 | return; | |
177 | ||
178 | /* | |
179 | * Try to get string again, since the string can be changed while | |
180 | * probing. | |
181 | */ | |
182 | set_fs(KERNEL_DS); | |
183 | pagefault_disable(); | |
184 | ||
185 | do | |
186 | ret = __copy_from_user_inatomic(dst++, src++, 1); | |
187 | while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen); | |
188 | ||
189 | dst[-1] = '\0'; | |
190 | pagefault_enable(); | |
191 | set_fs(old_fs); | |
192 | ||
193 | if (ret < 0) { /* Failed to fetch string */ | |
194 | ((u8 *)get_rloc_data(dest))[0] = '\0'; | |
195 | *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest)); | |
196 | } else { | |
197 | *(u32 *)dest = make_data_rloc(src - (u8 *)addr, | |
198 | get_rloc_offs(*(u32 *)dest)); | |
199 | } | |
200 | } | |
201 | ||
202 | /* Return the length of string -- including null terminal byte */ | |
203 | static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, | |
204 | void *addr, void *dest) | |
205 | { | |
206 | mm_segment_t old_fs; | |
207 | int ret, len = 0; | |
208 | u8 c; | |
209 | ||
210 | old_fs = get_fs(); | |
211 | set_fs(KERNEL_DS); | |
212 | pagefault_disable(); | |
213 | ||
214 | do { | |
215 | ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1); | |
216 | len++; | |
217 | } while (c && ret == 0 && len < MAX_STRING_SIZE); | |
218 | ||
219 | pagefault_enable(); | |
220 | set_fs(old_fs); | |
221 | ||
222 | if (ret < 0) /* Failed to check the length */ | |
223 | *(u32 *)dest = 0; | |
224 | else | |
225 | *(u32 *)dest = len; | |
226 | } | |
227 | ||
1301a44e NK |
228 | #define DEFINE_FETCH_symbol(type) \ |
229 | __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, \ | |
230 | void *data, void *dest) \ | |
231 | { \ | |
232 | struct symbol_cache *sc = data; \ | |
233 | if (sc->addr) \ | |
234 | fetch_memory_##type(regs, (void *)sc->addr, dest); \ | |
235 | else \ | |
236 | *(type *)dest = 0; \ | |
237 | } | |
238 | DEFINE_BASIC_FETCH_FUNCS(symbol) | |
239 | DEFINE_FETCH_symbol(string) | |
240 | DEFINE_FETCH_symbol(string_size) | |
241 | ||
34fee3a1 NK |
242 | /* Fetch type information table */ |
243 | const struct fetch_type kprobes_fetch_type_table[] = { | |
244 | /* Special types */ | |
245 | [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, | |
246 | sizeof(u32), 1, "__data_loc char[]"), | |
247 | [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, | |
248 | string_size, sizeof(u32), 0, "u32"), | |
249 | /* Basic types */ | |
250 | ASSIGN_FETCH_TYPE(u8, u8, 0), | |
251 | ASSIGN_FETCH_TYPE(u16, u16, 0), | |
252 | ASSIGN_FETCH_TYPE(u32, u32, 0), | |
253 | ASSIGN_FETCH_TYPE(u64, u64, 0), | |
254 | ASSIGN_FETCH_TYPE(s8, u8, 1), | |
255 | ASSIGN_FETCH_TYPE(s16, u16, 1), | |
256 | ASSIGN_FETCH_TYPE(s32, u32, 1), | |
257 | ASSIGN_FETCH_TYPE(s64, u64, 1), | |
258 | ||
259 | ASSIGN_FETCH_TYPE_END | |
260 | }; | |
261 | ||
4a846b44 MH |
262 | /* |
263 | * Allocate new trace_probe and initialize it (including kprobes). | |
264 | */ | |
c31ffb3f | 265 | static struct trace_kprobe *alloc_trace_kprobe(const char *group, |
f52487e9 | 266 | const char *event, |
4a846b44 MH |
267 | void *addr, |
268 | const char *symbol, | |
269 | unsigned long offs, | |
3a6b7666 | 270 | int nargs, bool is_return) |
413d37d1 | 271 | { |
c31ffb3f | 272 | struct trace_kprobe *tk; |
6f3cf440 | 273 | int ret = -ENOMEM; |
413d37d1 | 274 | |
c31ffb3f NK |
275 | tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL); |
276 | if (!tk) | |
6f3cf440 | 277 | return ERR_PTR(ret); |
413d37d1 MH |
278 | |
279 | if (symbol) { | |
c31ffb3f NK |
280 | tk->symbol = kstrdup(symbol, GFP_KERNEL); |
281 | if (!tk->symbol) | |
413d37d1 | 282 | goto error; |
c31ffb3f NK |
283 | tk->rp.kp.symbol_name = tk->symbol; |
284 | tk->rp.kp.offset = offs; | |
4a846b44 | 285 | } else |
c31ffb3f | 286 | tk->rp.kp.addr = addr; |
4a846b44 MH |
287 | |
288 | if (is_return) | |
c31ffb3f | 289 | tk->rp.handler = kretprobe_dispatcher; |
4a846b44 | 290 | else |
c31ffb3f | 291 | tk->rp.kp.pre_handler = kprobe_dispatcher; |
4a846b44 | 292 | |
da34634f | 293 | if (!event || !is_good_name(event)) { |
6f3cf440 | 294 | ret = -EINVAL; |
4263565d | 295 | goto error; |
6f3cf440 MH |
296 | } |
297 | ||
c31ffb3f NK |
298 | tk->tp.call.class = &tk->tp.class; |
299 | tk->tp.call.name = kstrdup(event, GFP_KERNEL); | |
300 | if (!tk->tp.call.name) | |
4263565d | 301 | goto error; |
413d37d1 | 302 | |
da34634f | 303 | if (!group || !is_good_name(group)) { |
6f3cf440 | 304 | ret = -EINVAL; |
f52487e9 | 305 | goto error; |
6f3cf440 MH |
306 | } |
307 | ||
c31ffb3f NK |
308 | tk->tp.class.system = kstrdup(group, GFP_KERNEL); |
309 | if (!tk->tp.class.system) | |
f52487e9 MH |
310 | goto error; |
311 | ||
c31ffb3f NK |
312 | INIT_LIST_HEAD(&tk->list); |
313 | INIT_LIST_HEAD(&tk->tp.files); | |
314 | return tk; | |
413d37d1 | 315 | error: |
c31ffb3f NK |
316 | kfree(tk->tp.call.name); |
317 | kfree(tk->symbol); | |
318 | kfree(tk); | |
6f3cf440 | 319 | return ERR_PTR(ret); |
413d37d1 MH |
320 | } |
321 | ||
c31ffb3f | 322 | static void free_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 MH |
323 | { |
324 | int i; | |
325 | ||
c31ffb3f NK |
326 | for (i = 0; i < tk->tp.nr_args; i++) |
327 | traceprobe_free_probe_arg(&tk->tp.args[i]); | |
413d37d1 | 328 | |
c31ffb3f NK |
329 | kfree(tk->tp.call.class->system); |
330 | kfree(tk->tp.call.name); | |
331 | kfree(tk->symbol); | |
332 | kfree(tk); | |
413d37d1 MH |
333 | } |
334 | ||
c31ffb3f NK |
335 | static struct trace_kprobe *find_trace_kprobe(const char *event, |
336 | const char *group) | |
413d37d1 | 337 | { |
c31ffb3f | 338 | struct trace_kprobe *tk; |
413d37d1 | 339 | |
c31ffb3f NK |
340 | list_for_each_entry(tk, &probe_list, list) |
341 | if (strcmp(tk->tp.call.name, event) == 0 && | |
342 | strcmp(tk->tp.call.class->system, group) == 0) | |
343 | return tk; | |
413d37d1 MH |
344 | return NULL; |
345 | } | |
346 | ||
41a7dd42 MH |
347 | /* |
348 | * Enable trace_probe | |
349 | * if the file is NULL, enable "perf" handler, or enable "trace" handler. | |
350 | */ | |
351 | static int | |
c31ffb3f | 352 | enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file) |
1538f888 MH |
353 | { |
354 | int ret = 0; | |
355 | ||
41a7dd42 | 356 | if (file) { |
b04d52e3 ON |
357 | struct event_file_link *link; |
358 | ||
359 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
360 | if (!link) { | |
41a7dd42 | 361 | ret = -ENOMEM; |
3fe3d619 | 362 | goto out; |
41a7dd42 | 363 | } |
41a7dd42 | 364 | |
b04d52e3 | 365 | link->file = file; |
c31ffb3f | 366 | list_add_tail_rcu(&link->list, &tk->tp.files); |
41a7dd42 | 367 | |
c31ffb3f | 368 | tk->tp.flags |= TP_FLAG_TRACE; |
41a7dd42 | 369 | } else |
c31ffb3f | 370 | tk->tp.flags |= TP_FLAG_PROFILE; |
41a7dd42 | 371 | |
c31ffb3f NK |
372 | if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) { |
373 | if (trace_kprobe_is_return(tk)) | |
374 | ret = enable_kretprobe(&tk->rp); | |
1538f888 | 375 | else |
c31ffb3f | 376 | ret = enable_kprobe(&tk->rp.kp); |
1538f888 | 377 | } |
3fe3d619 | 378 | out: |
1538f888 MH |
379 | return ret; |
380 | } | |
381 | ||
b04d52e3 ON |
382 | static struct event_file_link * |
383 | find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file) | |
41a7dd42 | 384 | { |
b04d52e3 | 385 | struct event_file_link *link; |
41a7dd42 | 386 | |
b04d52e3 ON |
387 | list_for_each_entry(link, &tp->files, list) |
388 | if (link->file == file) | |
389 | return link; | |
41a7dd42 | 390 | |
b04d52e3 | 391 | return NULL; |
41a7dd42 MH |
392 | } |
393 | ||
394 | /* | |
395 | * Disable trace_probe | |
396 | * if the file is NULL, disable "perf" handler, or disable "trace" handler. | |
397 | */ | |
398 | static int | |
c31ffb3f | 399 | disable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file) |
1538f888 | 400 | { |
a232e270 MH |
401 | struct event_file_link *link = NULL; |
402 | int wait = 0; | |
41a7dd42 MH |
403 | int ret = 0; |
404 | ||
41a7dd42 | 405 | if (file) { |
c31ffb3f | 406 | link = find_event_file_link(&tk->tp, file); |
b04d52e3 | 407 | if (!link) { |
41a7dd42 | 408 | ret = -EINVAL; |
3fe3d619 | 409 | goto out; |
41a7dd42 MH |
410 | } |
411 | ||
b04d52e3 | 412 | list_del_rcu(&link->list); |
a232e270 | 413 | wait = 1; |
c31ffb3f | 414 | if (!list_empty(&tk->tp.files)) |
b04d52e3 | 415 | goto out; |
41a7dd42 | 416 | |
c31ffb3f | 417 | tk->tp.flags &= ~TP_FLAG_TRACE; |
41a7dd42 | 418 | } else |
c31ffb3f | 419 | tk->tp.flags &= ~TP_FLAG_PROFILE; |
41a7dd42 | 420 | |
c31ffb3f NK |
421 | if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) { |
422 | if (trace_kprobe_is_return(tk)) | |
423 | disable_kretprobe(&tk->rp); | |
1538f888 | 424 | else |
c31ffb3f | 425 | disable_kprobe(&tk->rp.kp); |
a232e270 | 426 | wait = 1; |
1538f888 | 427 | } |
3fe3d619 | 428 | out: |
a232e270 MH |
429 | if (wait) { |
430 | /* | |
431 | * Synchronize with kprobe_trace_func/kretprobe_trace_func | |
432 | * to ensure disabled (all running handlers are finished). | |
433 | * This is not only for kfree(), but also the caller, | |
434 | * trace_remove_event_call() supposes it for releasing | |
435 | * event_call related objects, which will be accessed in | |
436 | * the kprobe_trace_func/kretprobe_trace_func. | |
437 | */ | |
438 | synchronize_sched(); | |
439 | kfree(link); /* Ignored if link == NULL */ | |
440 | } | |
441 | ||
41a7dd42 | 442 | return ret; |
1538f888 MH |
443 | } |
444 | ||
61424318 | 445 | /* Internal register function - just handle k*probes and flags */ |
c31ffb3f | 446 | static int __register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 447 | { |
7f6878a3 | 448 | int i, ret; |
61424318 | 449 | |
c31ffb3f | 450 | if (trace_probe_is_registered(&tk->tp)) |
61424318 MH |
451 | return -EINVAL; |
452 | ||
c31ffb3f NK |
453 | for (i = 0; i < tk->tp.nr_args; i++) |
454 | traceprobe_update_arg(&tk->tp.args[i]); | |
7f6878a3 | 455 | |
61424318 | 456 | /* Set/clear disabled flag according to tp->flag */ |
c31ffb3f NK |
457 | if (trace_probe_is_enabled(&tk->tp)) |
458 | tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; | |
61424318 | 459 | else |
c31ffb3f | 460 | tk->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
61424318 | 461 | |
c31ffb3f NK |
462 | if (trace_kprobe_is_return(tk)) |
463 | ret = register_kretprobe(&tk->rp); | |
413d37d1 | 464 | else |
c31ffb3f | 465 | ret = register_kprobe(&tk->rp.kp); |
61424318 MH |
466 | |
467 | if (ret == 0) | |
c31ffb3f | 468 | tk->tp.flags |= TP_FLAG_REGISTERED; |
61424318 MH |
469 | else { |
470 | pr_warning("Could not insert probe at %s+%lu: %d\n", | |
c31ffb3f NK |
471 | trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret); |
472 | if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) { | |
61424318 MH |
473 | pr_warning("This probe might be able to register after" |
474 | "target module is loaded. Continue.\n"); | |
475 | ret = 0; | |
476 | } else if (ret == -EILSEQ) { | |
477 | pr_warning("Probing address(0x%p) is not an " | |
478 | "instruction boundary.\n", | |
c31ffb3f | 479 | tk->rp.kp.addr); |
61424318 MH |
480 | ret = -EINVAL; |
481 | } | |
482 | } | |
483 | ||
484 | return ret; | |
485 | } | |
486 | ||
487 | /* Internal unregister function - just handle k*probes and flags */ | |
c31ffb3f | 488 | static void __unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 489 | { |
c31ffb3f NK |
490 | if (trace_probe_is_registered(&tk->tp)) { |
491 | if (trace_kprobe_is_return(tk)) | |
492 | unregister_kretprobe(&tk->rp); | |
61424318 | 493 | else |
c31ffb3f NK |
494 | unregister_kprobe(&tk->rp.kp); |
495 | tk->tp.flags &= ~TP_FLAG_REGISTERED; | |
61424318 | 496 | /* Cleanup kprobe for reuse */ |
c31ffb3f NK |
497 | if (tk->rp.kp.symbol_name) |
498 | tk->rp.kp.addr = NULL; | |
61424318 MH |
499 | } |
500 | } | |
501 | ||
502 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ | |
c31ffb3f | 503 | static int unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 504 | { |
02ca1521 | 505 | /* Enabled event can not be unregistered */ |
c31ffb3f | 506 | if (trace_probe_is_enabled(&tk->tp)) |
02ca1521 MH |
507 | return -EBUSY; |
508 | ||
40c32592 | 509 | /* Will fail if probe is being used by ftrace or perf */ |
c31ffb3f | 510 | if (unregister_kprobe_event(tk)) |
40c32592 SRRH |
511 | return -EBUSY; |
512 | ||
c31ffb3f NK |
513 | __unregister_trace_kprobe(tk); |
514 | list_del(&tk->list); | |
02ca1521 MH |
515 | |
516 | return 0; | |
413d37d1 MH |
517 | } |
518 | ||
519 | /* Register a trace_probe and probe_event */ | |
c31ffb3f | 520 | static int register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 521 | { |
c31ffb3f | 522 | struct trace_kprobe *old_tk; |
413d37d1 MH |
523 | int ret; |
524 | ||
525 | mutex_lock(&probe_lock); | |
526 | ||
61424318 | 527 | /* Delete old (same name) event if exist */ |
c31ffb3f NK |
528 | old_tk = find_trace_kprobe(tk->tp.call.name, tk->tp.call.class->system); |
529 | if (old_tk) { | |
530 | ret = unregister_trace_kprobe(old_tk); | |
02ca1521 MH |
531 | if (ret < 0) |
532 | goto end; | |
c31ffb3f | 533 | free_trace_kprobe(old_tk); |
2d5e067e | 534 | } |
61424318 MH |
535 | |
536 | /* Register new event */ | |
c31ffb3f | 537 | ret = register_kprobe_event(tk); |
2d5e067e | 538 | if (ret) { |
426d3107 | 539 | pr_warning("Failed to register probe event(%d)\n", ret); |
2d5e067e MH |
540 | goto end; |
541 | } | |
542 | ||
61424318 | 543 | /* Register k*probe */ |
c31ffb3f | 544 | ret = __register_trace_kprobe(tk); |
61424318 | 545 | if (ret < 0) |
c31ffb3f | 546 | unregister_kprobe_event(tk); |
61424318 | 547 | else |
c31ffb3f | 548 | list_add_tail(&tk->list, &probe_list); |
61424318 | 549 | |
413d37d1 MH |
550 | end: |
551 | mutex_unlock(&probe_lock); | |
552 | return ret; | |
553 | } | |
554 | ||
61424318 | 555 | /* Module notifier call back, checking event on the module */ |
c31ffb3f | 556 | static int trace_kprobe_module_callback(struct notifier_block *nb, |
61424318 MH |
557 | unsigned long val, void *data) |
558 | { | |
559 | struct module *mod = data; | |
c31ffb3f | 560 | struct trace_kprobe *tk; |
61424318 MH |
561 | int ret; |
562 | ||
563 | if (val != MODULE_STATE_COMING) | |
564 | return NOTIFY_DONE; | |
565 | ||
566 | /* Update probes on coming module */ | |
567 | mutex_lock(&probe_lock); | |
c31ffb3f NK |
568 | list_for_each_entry(tk, &probe_list, list) { |
569 | if (trace_kprobe_within_module(tk, mod)) { | |
02ca1521 | 570 | /* Don't need to check busy - this should have gone. */ |
c31ffb3f NK |
571 | __unregister_trace_kprobe(tk); |
572 | ret = __register_trace_kprobe(tk); | |
61424318 MH |
573 | if (ret) |
574 | pr_warning("Failed to re-register probe %s on" | |
575 | "%s: %d\n", | |
c31ffb3f | 576 | tk->tp.call.name, mod->name, ret); |
61424318 MH |
577 | } |
578 | } | |
579 | mutex_unlock(&probe_lock); | |
580 | ||
581 | return NOTIFY_DONE; | |
582 | } | |
583 | ||
c31ffb3f NK |
584 | static struct notifier_block trace_kprobe_module_nb = { |
585 | .notifier_call = trace_kprobe_module_callback, | |
61424318 MH |
586 | .priority = 1 /* Invoked after kprobe module callback */ |
587 | }; | |
588 | ||
c31ffb3f | 589 | static int create_trace_kprobe(int argc, char **argv) |
413d37d1 MH |
590 | { |
591 | /* | |
592 | * Argument syntax: | |
61424318 MH |
593 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
594 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] | |
413d37d1 | 595 | * Fetch args: |
2e06ff63 MH |
596 | * $retval : fetch return value |
597 | * $stack : fetch stack address | |
598 | * $stackN : fetch Nth of stack (N:0-) | |
413d37d1 MH |
599 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
600 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) | |
601 | * %REG : fetch register REG | |
93ccae7a | 602 | * Dereferencing memory fetch: |
413d37d1 | 603 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
eca0d916 MH |
604 | * Alias name of args: |
605 | * NAME=FETCHARG : set NAME as alias of FETCHARG. | |
93ccae7a MH |
606 | * Type of args: |
607 | * FETCHARG:TYPE : use TYPE instead of unsigned long. | |
413d37d1 | 608 | */ |
c31ffb3f | 609 | struct trace_kprobe *tk; |
413d37d1 | 610 | int i, ret = 0; |
3a6b7666 | 611 | bool is_return = false, is_delete = false; |
93ccae7a | 612 | char *symbol = NULL, *event = NULL, *group = NULL; |
da34634f | 613 | char *arg; |
2fba0c88 | 614 | unsigned long offset = 0; |
413d37d1 | 615 | void *addr = NULL; |
4a846b44 | 616 | char buf[MAX_EVENT_NAME_LEN]; |
413d37d1 | 617 | |
a7c312be | 618 | /* argc must be >= 1 */ |
413d37d1 | 619 | if (argv[0][0] == 'p') |
3a6b7666 | 620 | is_return = false; |
413d37d1 | 621 | else if (argv[0][0] == 'r') |
3a6b7666 | 622 | is_return = true; |
a7c312be | 623 | else if (argv[0][0] == '-') |
3a6b7666 | 624 | is_delete = true; |
e63cc239 | 625 | else { |
a7c312be MH |
626 | pr_info("Probe definition must be started with 'p', 'r' or" |
627 | " '-'.\n"); | |
413d37d1 | 628 | return -EINVAL; |
e63cc239 | 629 | } |
413d37d1 MH |
630 | |
631 | if (argv[0][1] == ':') { | |
632 | event = &argv[0][2]; | |
f52487e9 MH |
633 | if (strchr(event, '/')) { |
634 | group = event; | |
635 | event = strchr(group, '/') + 1; | |
636 | event[-1] = '\0'; | |
637 | if (strlen(group) == 0) { | |
a5efd925 | 638 | pr_info("Group name is not specified\n"); |
f52487e9 MH |
639 | return -EINVAL; |
640 | } | |
641 | } | |
413d37d1 | 642 | if (strlen(event) == 0) { |
a5efd925 | 643 | pr_info("Event name is not specified\n"); |
413d37d1 MH |
644 | return -EINVAL; |
645 | } | |
646 | } | |
a7c312be MH |
647 | if (!group) |
648 | group = KPROBE_EVENT_SYSTEM; | |
413d37d1 | 649 | |
a7c312be MH |
650 | if (is_delete) { |
651 | if (!event) { | |
652 | pr_info("Delete command needs an event name.\n"); | |
653 | return -EINVAL; | |
654 | } | |
9da79ab8 | 655 | mutex_lock(&probe_lock); |
c31ffb3f NK |
656 | tk = find_trace_kprobe(event, group); |
657 | if (!tk) { | |
9da79ab8 | 658 | mutex_unlock(&probe_lock); |
a7c312be MH |
659 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
660 | return -ENOENT; | |
661 | } | |
662 | /* delete an event */ | |
c31ffb3f | 663 | ret = unregister_trace_kprobe(tk); |
02ca1521 | 664 | if (ret == 0) |
c31ffb3f | 665 | free_trace_kprobe(tk); |
9da79ab8 | 666 | mutex_unlock(&probe_lock); |
02ca1521 | 667 | return ret; |
a7c312be MH |
668 | } |
669 | ||
670 | if (argc < 2) { | |
671 | pr_info("Probe point is not specified.\n"); | |
672 | return -EINVAL; | |
673 | } | |
413d37d1 | 674 | if (isdigit(argv[1][0])) { |
e63cc239 MH |
675 | if (is_return) { |
676 | pr_info("Return probe point must be a symbol.\n"); | |
413d37d1 | 677 | return -EINVAL; |
e63cc239 | 678 | } |
413d37d1 | 679 | /* an address specified */ |
bcd83ea6 | 680 | ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); |
e63cc239 MH |
681 | if (ret) { |
682 | pr_info("Failed to parse address.\n"); | |
413d37d1 | 683 | return ret; |
e63cc239 | 684 | } |
413d37d1 MH |
685 | } else { |
686 | /* a symbol specified */ | |
687 | symbol = argv[1]; | |
688 | /* TODO: support .init module functions */ | |
8ab83f56 | 689 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
e63cc239 MH |
690 | if (ret) { |
691 | pr_info("Failed to parse symbol.\n"); | |
413d37d1 | 692 | return ret; |
e63cc239 MH |
693 | } |
694 | if (offset && is_return) { | |
695 | pr_info("Return probe must be used without offset.\n"); | |
413d37d1 | 696 | return -EINVAL; |
e63cc239 | 697 | } |
413d37d1 | 698 | } |
a82378d8 | 699 | argc -= 2; argv += 2; |
413d37d1 MH |
700 | |
701 | /* setup a probe */ | |
4263565d MH |
702 | if (!event) { |
703 | /* Make a new event name */ | |
4263565d | 704 | if (symbol) |
6f3cf440 | 705 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
4263565d MH |
706 | is_return ? 'r' : 'p', symbol, offset); |
707 | else | |
6f3cf440 | 708 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
4263565d | 709 | is_return ? 'r' : 'p', addr); |
4a846b44 MH |
710 | event = buf; |
711 | } | |
c31ffb3f | 712 | tk = alloc_trace_kprobe(group, event, addr, symbol, offset, argc, |
f52487e9 | 713 | is_return); |
c31ffb3f | 714 | if (IS_ERR(tk)) { |
e63cc239 | 715 | pr_info("Failed to allocate trace_probe.(%d)\n", |
c31ffb3f NK |
716 | (int)PTR_ERR(tk)); |
717 | return PTR_ERR(tk); | |
e63cc239 | 718 | } |
413d37d1 | 719 | |
413d37d1 | 720 | /* parse arguments */ |
a82378d8 MH |
721 | ret = 0; |
722 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { | |
c31ffb3f NK |
723 | struct probe_arg *parg = &tk->tp.args[i]; |
724 | ||
61a52736 | 725 | /* Increment count for freeing args in error case */ |
c31ffb3f | 726 | tk->tp.nr_args++; |
61a52736 | 727 | |
eca0d916 MH |
728 | /* Parse argument name */ |
729 | arg = strchr(argv[i], '='); | |
aba91595 | 730 | if (arg) { |
eca0d916 | 731 | *arg++ = '\0'; |
c31ffb3f | 732 | parg->name = kstrdup(argv[i], GFP_KERNEL); |
aba91595 | 733 | } else { |
eca0d916 | 734 | arg = argv[i]; |
aba91595 MH |
735 | /* If argument name is omitted, set "argN" */ |
736 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); | |
c31ffb3f | 737 | parg->name = kstrdup(buf, GFP_KERNEL); |
aba91595 | 738 | } |
a703d946 | 739 | |
c31ffb3f | 740 | if (!parg->name) { |
aba91595 | 741 | pr_info("Failed to allocate argument[%d] name.\n", i); |
ba8665d7 | 742 | ret = -ENOMEM; |
413d37d1 MH |
743 | goto error; |
744 | } | |
da34634f | 745 | |
c31ffb3f | 746 | if (!is_good_name(parg->name)) { |
da34634f | 747 | pr_info("Invalid argument[%d] name: %s\n", |
c31ffb3f | 748 | i, parg->name); |
da34634f MH |
749 | ret = -EINVAL; |
750 | goto error; | |
751 | } | |
93ccae7a | 752 | |
c31ffb3f NK |
753 | if (traceprobe_conflict_field_name(parg->name, |
754 | tk->tp.args, i)) { | |
aba91595 | 755 | pr_info("Argument[%d] name '%s' conflicts with " |
93ccae7a MH |
756 | "another field.\n", i, argv[i]); |
757 | ret = -EINVAL; | |
758 | goto error; | |
759 | } | |
ba8665d7 MH |
760 | |
761 | /* Parse fetch argument */ | |
c31ffb3f | 762 | ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg, |
f3f096cf | 763 | is_return, true); |
e63cc239 | 764 | if (ret) { |
aba91595 | 765 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
413d37d1 | 766 | goto error; |
e63cc239 | 767 | } |
413d37d1 | 768 | } |
413d37d1 | 769 | |
c31ffb3f | 770 | ret = register_trace_kprobe(tk); |
413d37d1 MH |
771 | if (ret) |
772 | goto error; | |
773 | return 0; | |
774 | ||
775 | error: | |
c31ffb3f | 776 | free_trace_kprobe(tk); |
413d37d1 MH |
777 | return ret; |
778 | } | |
779 | ||
c31ffb3f | 780 | static int release_all_trace_kprobes(void) |
413d37d1 | 781 | { |
c31ffb3f | 782 | struct trace_kprobe *tk; |
02ca1521 | 783 | int ret = 0; |
413d37d1 MH |
784 | |
785 | mutex_lock(&probe_lock); | |
02ca1521 | 786 | /* Ensure no probe is in use. */ |
c31ffb3f NK |
787 | list_for_each_entry(tk, &probe_list, list) |
788 | if (trace_probe_is_enabled(&tk->tp)) { | |
02ca1521 MH |
789 | ret = -EBUSY; |
790 | goto end; | |
791 | } | |
413d37d1 MH |
792 | /* TODO: Use batch unregistration */ |
793 | while (!list_empty(&probe_list)) { | |
c31ffb3f NK |
794 | tk = list_entry(probe_list.next, struct trace_kprobe, list); |
795 | ret = unregister_trace_kprobe(tk); | |
40c32592 SRRH |
796 | if (ret) |
797 | goto end; | |
c31ffb3f | 798 | free_trace_kprobe(tk); |
413d37d1 | 799 | } |
02ca1521 MH |
800 | |
801 | end: | |
413d37d1 | 802 | mutex_unlock(&probe_lock); |
02ca1521 MH |
803 | |
804 | return ret; | |
413d37d1 MH |
805 | } |
806 | ||
413d37d1 MH |
807 | /* Probes listing interfaces */ |
808 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) | |
809 | { | |
810 | mutex_lock(&probe_lock); | |
811 | return seq_list_start(&probe_list, *pos); | |
812 | } | |
813 | ||
814 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
815 | { | |
816 | return seq_list_next(v, &probe_list, pos); | |
817 | } | |
818 | ||
819 | static void probes_seq_stop(struct seq_file *m, void *v) | |
820 | { | |
821 | mutex_unlock(&probe_lock); | |
822 | } | |
823 | ||
824 | static int probes_seq_show(struct seq_file *m, void *v) | |
825 | { | |
c31ffb3f | 826 | struct trace_kprobe *tk = v; |
93ccae7a | 827 | int i; |
413d37d1 | 828 | |
c31ffb3f NK |
829 | seq_printf(m, "%c", trace_kprobe_is_return(tk) ? 'r' : 'p'); |
830 | seq_printf(m, ":%s/%s", tk->tp.call.class->system, tk->tp.call.name); | |
413d37d1 | 831 | |
c31ffb3f NK |
832 | if (!tk->symbol) |
833 | seq_printf(m, " 0x%p", tk->rp.kp.addr); | |
834 | else if (tk->rp.kp.offset) | |
835 | seq_printf(m, " %s+%u", trace_kprobe_symbol(tk), | |
836 | tk->rp.kp.offset); | |
413d37d1 | 837 | else |
c31ffb3f | 838 | seq_printf(m, " %s", trace_kprobe_symbol(tk)); |
413d37d1 | 839 | |
c31ffb3f NK |
840 | for (i = 0; i < tk->tp.nr_args; i++) |
841 | seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm); | |
413d37d1 | 842 | seq_printf(m, "\n"); |
93ccae7a | 843 | |
413d37d1 MH |
844 | return 0; |
845 | } | |
846 | ||
847 | static const struct seq_operations probes_seq_op = { | |
848 | .start = probes_seq_start, | |
849 | .next = probes_seq_next, | |
850 | .stop = probes_seq_stop, | |
851 | .show = probes_seq_show | |
852 | }; | |
853 | ||
854 | static int probes_open(struct inode *inode, struct file *file) | |
855 | { | |
02ca1521 MH |
856 | int ret; |
857 | ||
858 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { | |
c31ffb3f | 859 | ret = release_all_trace_kprobes(); |
02ca1521 MH |
860 | if (ret < 0) |
861 | return ret; | |
862 | } | |
413d37d1 MH |
863 | |
864 | return seq_open(file, &probes_seq_op); | |
865 | } | |
866 | ||
413d37d1 MH |
867 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
868 | size_t count, loff_t *ppos) | |
869 | { | |
8ab83f56 | 870 | return traceprobe_probes_write(file, buffer, count, ppos, |
c31ffb3f | 871 | create_trace_kprobe); |
413d37d1 MH |
872 | } |
873 | ||
874 | static const struct file_operations kprobe_events_ops = { | |
875 | .owner = THIS_MODULE, | |
876 | .open = probes_open, | |
877 | .read = seq_read, | |
878 | .llseek = seq_lseek, | |
879 | .release = seq_release, | |
880 | .write = probes_write, | |
881 | }; | |
882 | ||
cd7e7bd5 MH |
883 | /* Probes profiling interfaces */ |
884 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
885 | { | |
c31ffb3f | 886 | struct trace_kprobe *tk = v; |
cd7e7bd5 | 887 | |
c31ffb3f NK |
888 | seq_printf(m, " %-44s %15lu %15lu\n", tk->tp.call.name, tk->nhit, |
889 | tk->rp.kp.nmissed); | |
cd7e7bd5 MH |
890 | |
891 | return 0; | |
892 | } | |
893 | ||
894 | static const struct seq_operations profile_seq_op = { | |
895 | .start = probes_seq_start, | |
896 | .next = probes_seq_next, | |
897 | .stop = probes_seq_stop, | |
898 | .show = probes_profile_seq_show | |
899 | }; | |
900 | ||
901 | static int profile_open(struct inode *inode, struct file *file) | |
902 | { | |
903 | return seq_open(file, &profile_seq_op); | |
904 | } | |
905 | ||
906 | static const struct file_operations kprobe_profile_ops = { | |
907 | .owner = THIS_MODULE, | |
908 | .open = profile_open, | |
909 | .read = seq_read, | |
910 | .llseek = seq_lseek, | |
911 | .release = seq_release, | |
912 | }; | |
913 | ||
413d37d1 | 914 | /* Kprobe handler */ |
2b106aab | 915 | static __kprobes void |
c31ffb3f | 916 | __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, |
41a7dd42 | 917 | struct ftrace_event_file *ftrace_file) |
413d37d1 | 918 | { |
93ccae7a | 919 | struct kprobe_trace_entry_head *entry; |
413d37d1 | 920 | struct ring_buffer_event *event; |
8f8ffe24 | 921 | struct ring_buffer *buffer; |
e09c8614 | 922 | int size, dsize, pc; |
413d37d1 | 923 | unsigned long irq_flags; |
c31ffb3f | 924 | struct ftrace_event_call *call = &tk->tp.call; |
413d37d1 | 925 | |
41a7dd42 MH |
926 | WARN_ON(call != ftrace_file->event_call); |
927 | ||
b8820084 MH |
928 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
929 | return; | |
930 | ||
413d37d1 MH |
931 | local_save_flags(irq_flags); |
932 | pc = preempt_count(); | |
933 | ||
c31ffb3f NK |
934 | dsize = __get_data_size(&tk->tp, regs); |
935 | size = sizeof(*entry) + tk->tp.size + dsize; | |
413d37d1 | 936 | |
41a7dd42 MH |
937 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
938 | call->event.type, | |
939 | size, irq_flags, pc); | |
413d37d1 | 940 | if (!event) |
1e12a4a7 | 941 | return; |
413d37d1 MH |
942 | |
943 | entry = ring_buffer_event_data(event); | |
c31ffb3f NK |
944 | entry->ip = (unsigned long)tk->rp.kp.addr; |
945 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); | |
413d37d1 | 946 | |
f306cc82 | 947 | if (!filter_check_discard(ftrace_file, entry, buffer, event)) |
0d5c6e1c SR |
948 | trace_buffer_unlock_commit_regs(buffer, event, |
949 | irq_flags, pc, regs); | |
413d37d1 MH |
950 | } |
951 | ||
41a7dd42 | 952 | static __kprobes void |
c31ffb3f | 953 | kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs) |
41a7dd42 | 954 | { |
b04d52e3 | 955 | struct event_file_link *link; |
41a7dd42 | 956 | |
c31ffb3f NK |
957 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
958 | __kprobe_trace_func(tk, regs, link->file); | |
41a7dd42 MH |
959 | } |
960 | ||
413d37d1 | 961 | /* Kretprobe handler */ |
2b106aab | 962 | static __kprobes void |
c31ffb3f | 963 | __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 MH |
964 | struct pt_regs *regs, |
965 | struct ftrace_event_file *ftrace_file) | |
413d37d1 | 966 | { |
93ccae7a | 967 | struct kretprobe_trace_entry_head *entry; |
413d37d1 | 968 | struct ring_buffer_event *event; |
8f8ffe24 | 969 | struct ring_buffer *buffer; |
e09c8614 | 970 | int size, pc, dsize; |
413d37d1 | 971 | unsigned long irq_flags; |
c31ffb3f | 972 | struct ftrace_event_call *call = &tk->tp.call; |
413d37d1 | 973 | |
41a7dd42 MH |
974 | WARN_ON(call != ftrace_file->event_call); |
975 | ||
b8820084 MH |
976 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
977 | return; | |
978 | ||
413d37d1 MH |
979 | local_save_flags(irq_flags); |
980 | pc = preempt_count(); | |
981 | ||
c31ffb3f NK |
982 | dsize = __get_data_size(&tk->tp, regs); |
983 | size = sizeof(*entry) + tk->tp.size + dsize; | |
413d37d1 | 984 | |
41a7dd42 MH |
985 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
986 | call->event.type, | |
987 | size, irq_flags, pc); | |
413d37d1 | 988 | if (!event) |
1e12a4a7 | 989 | return; |
413d37d1 MH |
990 | |
991 | entry = ring_buffer_event_data(event); | |
c31ffb3f | 992 | entry->func = (unsigned long)tk->rp.kp.addr; |
413d37d1 | 993 | entry->ret_ip = (unsigned long)ri->ret_addr; |
c31ffb3f | 994 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
413d37d1 | 995 | |
f306cc82 | 996 | if (!filter_check_discard(ftrace_file, entry, buffer, event)) |
0d5c6e1c SR |
997 | trace_buffer_unlock_commit_regs(buffer, event, |
998 | irq_flags, pc, regs); | |
413d37d1 MH |
999 | } |
1000 | ||
41a7dd42 | 1001 | static __kprobes void |
c31ffb3f | 1002 | kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 MH |
1003 | struct pt_regs *regs) |
1004 | { | |
b04d52e3 | 1005 | struct event_file_link *link; |
41a7dd42 | 1006 | |
c31ffb3f NK |
1007 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
1008 | __kretprobe_trace_func(tk, ri, regs, link->file); | |
41a7dd42 MH |
1009 | } |
1010 | ||
413d37d1 | 1011 | /* Event entry printers */ |
b62fdd97 | 1012 | static enum print_line_t |
a9a57763 SR |
1013 | print_kprobe_event(struct trace_iterator *iter, int flags, |
1014 | struct trace_event *event) | |
413d37d1 | 1015 | { |
93ccae7a | 1016 | struct kprobe_trace_entry_head *field; |
413d37d1 | 1017 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1018 | struct trace_probe *tp; |
93ccae7a | 1019 | u8 *data; |
413d37d1 MH |
1020 | int i; |
1021 | ||
93ccae7a | 1022 | field = (struct kprobe_trace_entry_head *)iter->ent; |
80decc70 | 1023 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1024 | |
6e9f23d1 MH |
1025 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
1026 | goto partial; | |
1027 | ||
413d37d1 MH |
1028 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
1029 | goto partial; | |
1030 | ||
6e9f23d1 | 1031 | if (!trace_seq_puts(s, ")")) |
413d37d1 MH |
1032 | goto partial; |
1033 | ||
93ccae7a MH |
1034 | data = (u8 *)&field[1]; |
1035 | for (i = 0; i < tp->nr_args; i++) | |
1036 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1037 | data + tp->args[i].offset, field)) |
413d37d1 MH |
1038 | goto partial; |
1039 | ||
1040 | if (!trace_seq_puts(s, "\n")) | |
1041 | goto partial; | |
1042 | ||
1043 | return TRACE_TYPE_HANDLED; | |
1044 | partial: | |
1045 | return TRACE_TYPE_PARTIAL_LINE; | |
1046 | } | |
1047 | ||
b62fdd97 | 1048 | static enum print_line_t |
a9a57763 SR |
1049 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
1050 | struct trace_event *event) | |
413d37d1 | 1051 | { |
93ccae7a | 1052 | struct kretprobe_trace_entry_head *field; |
413d37d1 | 1053 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1054 | struct trace_probe *tp; |
93ccae7a | 1055 | u8 *data; |
413d37d1 MH |
1056 | int i; |
1057 | ||
93ccae7a | 1058 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
80decc70 | 1059 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1060 | |
6e9f23d1 MH |
1061 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
1062 | goto partial; | |
1063 | ||
413d37d1 MH |
1064 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
1065 | goto partial; | |
1066 | ||
1067 | if (!trace_seq_puts(s, " <- ")) | |
1068 | goto partial; | |
1069 | ||
1070 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) | |
1071 | goto partial; | |
1072 | ||
6e9f23d1 | 1073 | if (!trace_seq_puts(s, ")")) |
413d37d1 MH |
1074 | goto partial; |
1075 | ||
93ccae7a MH |
1076 | data = (u8 *)&field[1]; |
1077 | for (i = 0; i < tp->nr_args; i++) | |
1078 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1079 | data + tp->args[i].offset, field)) |
413d37d1 MH |
1080 | goto partial; |
1081 | ||
1082 | if (!trace_seq_puts(s, "\n")) | |
1083 | goto partial; | |
1084 | ||
1085 | return TRACE_TYPE_HANDLED; | |
1086 | partial: | |
1087 | return TRACE_TYPE_PARTIAL_LINE; | |
1088 | } | |
1089 | ||
413d37d1 MH |
1090 | |
1091 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) | |
1092 | { | |
1093 | int ret, i; | |
93ccae7a | 1094 | struct kprobe_trace_entry_head field; |
c31ffb3f | 1095 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1096 | |
a703d946 | 1097 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
eca0d916 | 1098 | /* Set argument names as fields */ |
c31ffb3f NK |
1099 | for (i = 0; i < tk->tp.nr_args; i++) { |
1100 | struct probe_arg *parg = &tk->tp.args[i]; | |
1101 | ||
1102 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1103 | parg->name, | |
1104 | sizeof(field) + parg->offset, | |
1105 | parg->type->size, | |
1106 | parg->type->is_signed, | |
93ccae7a MH |
1107 | FILTER_OTHER); |
1108 | if (ret) | |
1109 | return ret; | |
1110 | } | |
413d37d1 MH |
1111 | return 0; |
1112 | } | |
1113 | ||
1114 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) | |
1115 | { | |
1116 | int ret, i; | |
93ccae7a | 1117 | struct kretprobe_trace_entry_head field; |
c31ffb3f | 1118 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1119 | |
a703d946 MH |
1120 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
1121 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); | |
eca0d916 | 1122 | /* Set argument names as fields */ |
c31ffb3f NK |
1123 | for (i = 0; i < tk->tp.nr_args; i++) { |
1124 | struct probe_arg *parg = &tk->tp.args[i]; | |
1125 | ||
1126 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1127 | parg->name, | |
1128 | sizeof(field) + parg->offset, | |
1129 | parg->type->size, | |
1130 | parg->type->is_signed, | |
93ccae7a MH |
1131 | FILTER_OTHER); |
1132 | if (ret) | |
1133 | return ret; | |
1134 | } | |
413d37d1 MH |
1135 | return 0; |
1136 | } | |
1137 | ||
07b139c8 | 1138 | #ifdef CONFIG_PERF_EVENTS |
e08d1c65 MH |
1139 | |
1140 | /* Kprobe profile handler */ | |
2b106aab | 1141 | static __kprobes void |
c31ffb3f | 1142 | kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs) |
e08d1c65 | 1143 | { |
c31ffb3f | 1144 | struct ftrace_event_call *call = &tk->tp.call; |
93ccae7a | 1145 | struct kprobe_trace_entry_head *entry; |
1c024eca | 1146 | struct hlist_head *head; |
e09c8614 | 1147 | int size, __size, dsize; |
4ed7c92d | 1148 | int rctx; |
e08d1c65 | 1149 | |
288e984e ON |
1150 | head = this_cpu_ptr(call->perf_events); |
1151 | if (hlist_empty(head)) | |
1152 | return; | |
1153 | ||
c31ffb3f NK |
1154 | dsize = __get_data_size(&tk->tp, regs); |
1155 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1156 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1157 | size -= sizeof(u32); | |
ce71b9df | 1158 | |
ff5f149b | 1159 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
430ad5a6 | 1160 | if (!entry) |
1e12a4a7 | 1161 | return; |
a1a138d0 | 1162 | |
c31ffb3f | 1163 | entry->ip = (unsigned long)tk->rp.kp.addr; |
e09c8614 | 1164 | memset(&entry[1], 0, dsize); |
c31ffb3f | 1165 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
cf6735a4 | 1166 | perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL); |
e08d1c65 MH |
1167 | } |
1168 | ||
1169 | /* Kretprobe profile handler */ | |
2b106aab | 1170 | static __kprobes void |
c31ffb3f | 1171 | kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
2b106aab | 1172 | struct pt_regs *regs) |
e08d1c65 | 1173 | { |
c31ffb3f | 1174 | struct ftrace_event_call *call = &tk->tp.call; |
93ccae7a | 1175 | struct kretprobe_trace_entry_head *entry; |
1c024eca | 1176 | struct hlist_head *head; |
e09c8614 | 1177 | int size, __size, dsize; |
4ed7c92d | 1178 | int rctx; |
e08d1c65 | 1179 | |
288e984e ON |
1180 | head = this_cpu_ptr(call->perf_events); |
1181 | if (hlist_empty(head)) | |
1182 | return; | |
1183 | ||
c31ffb3f NK |
1184 | dsize = __get_data_size(&tk->tp, regs); |
1185 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1186 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1187 | size -= sizeof(u32); | |
444a2a3b | 1188 | |
ff5f149b | 1189 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
430ad5a6 | 1190 | if (!entry) |
1e12a4a7 | 1191 | return; |
e08d1c65 | 1192 | |
c31ffb3f | 1193 | entry->func = (unsigned long)tk->rp.kp.addr; |
a1a138d0 | 1194 | entry->ret_ip = (unsigned long)ri->ret_addr; |
c31ffb3f | 1195 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
cf6735a4 | 1196 | perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL); |
e08d1c65 | 1197 | } |
07b139c8 | 1198 | #endif /* CONFIG_PERF_EVENTS */ |
50d78056 | 1199 | |
3fe3d619 ON |
1200 | /* |
1201 | * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex. | |
1202 | * | |
1203 | * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe | |
1204 | * lockless, but we can't race with this __init function. | |
1205 | */ | |
2239291a | 1206 | static __kprobes |
ceec0b6f JO |
1207 | int kprobe_register(struct ftrace_event_call *event, |
1208 | enum trace_reg type, void *data) | |
2239291a | 1209 | { |
c31ffb3f | 1210 | struct trace_kprobe *tk = (struct trace_kprobe *)event->data; |
41a7dd42 | 1211 | struct ftrace_event_file *file = data; |
1538f888 | 1212 | |
2239291a SR |
1213 | switch (type) { |
1214 | case TRACE_REG_REGISTER: | |
c31ffb3f | 1215 | return enable_trace_kprobe(tk, file); |
2239291a | 1216 | case TRACE_REG_UNREGISTER: |
c31ffb3f | 1217 | return disable_trace_kprobe(tk, file); |
2239291a SR |
1218 | |
1219 | #ifdef CONFIG_PERF_EVENTS | |
1220 | case TRACE_REG_PERF_REGISTER: | |
c31ffb3f | 1221 | return enable_trace_kprobe(tk, NULL); |
2239291a | 1222 | case TRACE_REG_PERF_UNREGISTER: |
c31ffb3f | 1223 | return disable_trace_kprobe(tk, NULL); |
ceec0b6f JO |
1224 | case TRACE_REG_PERF_OPEN: |
1225 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
1226 | case TRACE_REG_PERF_ADD: |
1227 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 1228 | return 0; |
2239291a SR |
1229 | #endif |
1230 | } | |
1231 | return 0; | |
1232 | } | |
50d78056 MH |
1233 | |
1234 | static __kprobes | |
1235 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) | |
1236 | { | |
c31ffb3f | 1237 | struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp); |
e08d1c65 | 1238 | |
c31ffb3f | 1239 | tk->nhit++; |
48182bd2 | 1240 | |
c31ffb3f NK |
1241 | if (tk->tp.flags & TP_FLAG_TRACE) |
1242 | kprobe_trace_func(tk, regs); | |
07b139c8 | 1243 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1244 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1245 | kprobe_perf_func(tk, regs); | |
07b139c8 | 1246 | #endif |
50d78056 MH |
1247 | return 0; /* We don't tweek kernel, so just return 0 */ |
1248 | } | |
1249 | ||
1250 | static __kprobes | |
1251 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) | |
1252 | { | |
c31ffb3f | 1253 | struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp); |
50d78056 | 1254 | |
c31ffb3f | 1255 | tk->nhit++; |
48182bd2 | 1256 | |
c31ffb3f NK |
1257 | if (tk->tp.flags & TP_FLAG_TRACE) |
1258 | kretprobe_trace_func(tk, ri, regs); | |
07b139c8 | 1259 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1260 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1261 | kretprobe_perf_func(tk, ri, regs); | |
07b139c8 | 1262 | #endif |
50d78056 MH |
1263 | return 0; /* We don't tweek kernel, so just return 0 */ |
1264 | } | |
e08d1c65 | 1265 | |
a9a57763 SR |
1266 | static struct trace_event_functions kretprobe_funcs = { |
1267 | .trace = print_kretprobe_event | |
1268 | }; | |
1269 | ||
1270 | static struct trace_event_functions kprobe_funcs = { | |
1271 | .trace = print_kprobe_event | |
1272 | }; | |
1273 | ||
c31ffb3f | 1274 | static int register_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1275 | { |
c31ffb3f | 1276 | struct ftrace_event_call *call = &tk->tp.call; |
413d37d1 MH |
1277 | int ret; |
1278 | ||
1279 | /* Initialize ftrace_event_call */ | |
ffb9f995 | 1280 | INIT_LIST_HEAD(&call->class->fields); |
c31ffb3f | 1281 | if (trace_kprobe_is_return(tk)) { |
80decc70 | 1282 | call->event.funcs = &kretprobe_funcs; |
2e33af02 | 1283 | call->class->define_fields = kretprobe_event_define_fields; |
413d37d1 | 1284 | } else { |
80decc70 | 1285 | call->event.funcs = &kprobe_funcs; |
2e33af02 | 1286 | call->class->define_fields = kprobe_event_define_fields; |
413d37d1 | 1287 | } |
5bf652aa | 1288 | if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) |
a342a028 | 1289 | return -ENOMEM; |
32c0edae SR |
1290 | ret = register_ftrace_event(&call->event); |
1291 | if (!ret) { | |
a342a028 | 1292 | kfree(call->print_fmt); |
ff50d991 | 1293 | return -ENODEV; |
a342a028 | 1294 | } |
553552ce | 1295 | call->flags = 0; |
2239291a | 1296 | call->class->reg = kprobe_register; |
c31ffb3f | 1297 | call->data = tk; |
413d37d1 | 1298 | ret = trace_add_event_call(call); |
ff50d991 | 1299 | if (ret) { |
413d37d1 | 1300 | pr_info("Failed to register kprobe event: %s\n", call->name); |
a342a028 | 1301 | kfree(call->print_fmt); |
80decc70 | 1302 | unregister_ftrace_event(&call->event); |
ff50d991 | 1303 | } |
413d37d1 MH |
1304 | return ret; |
1305 | } | |
1306 | ||
c31ffb3f | 1307 | static int unregister_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1308 | { |
40c32592 SRRH |
1309 | int ret; |
1310 | ||
ff50d991 | 1311 | /* tp->event is unregistered in trace_remove_event_call() */ |
c31ffb3f | 1312 | ret = trace_remove_event_call(&tk->tp.call); |
40c32592 | 1313 | if (!ret) |
c31ffb3f | 1314 | kfree(tk->tp.call.print_fmt); |
40c32592 | 1315 | return ret; |
413d37d1 MH |
1316 | } |
1317 | ||
25985edc | 1318 | /* Make a debugfs interface for controlling probe points */ |
413d37d1 MH |
1319 | static __init int init_kprobe_trace(void) |
1320 | { | |
1321 | struct dentry *d_tracer; | |
1322 | struct dentry *entry; | |
413d37d1 | 1323 | |
c31ffb3f | 1324 | if (register_module_notifier(&trace_kprobe_module_nb)) |
61424318 MH |
1325 | return -EINVAL; |
1326 | ||
413d37d1 MH |
1327 | d_tracer = tracing_init_dentry(); |
1328 | if (!d_tracer) | |
1329 | return 0; | |
1330 | ||
1331 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, | |
1332 | NULL, &kprobe_events_ops); | |
1333 | ||
cd7e7bd5 | 1334 | /* Event list interface */ |
413d37d1 MH |
1335 | if (!entry) |
1336 | pr_warning("Could not create debugfs " | |
1337 | "'kprobe_events' entry\n"); | |
cd7e7bd5 MH |
1338 | |
1339 | /* Profile interface */ | |
1340 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, | |
1341 | NULL, &kprobe_profile_ops); | |
1342 | ||
1343 | if (!entry) | |
1344 | pr_warning("Could not create debugfs " | |
1345 | "'kprobe_profile' entry\n"); | |
413d37d1 MH |
1346 | return 0; |
1347 | } | |
1348 | fs_initcall(init_kprobe_trace); | |
1349 | ||
1350 | ||
1351 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1352 | ||
265a5b7e SR |
1353 | /* |
1354 | * The "__used" keeps gcc from removing the function symbol | |
1355 | * from the kallsyms table. | |
1356 | */ | |
1357 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, | |
1358 | int a4, int a5, int a6) | |
413d37d1 MH |
1359 | { |
1360 | return a1 + a2 + a3 + a4 + a5 + a6; | |
1361 | } | |
1362 | ||
41a7dd42 | 1363 | static struct ftrace_event_file * |
c31ffb3f | 1364 | find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr) |
41a7dd42 MH |
1365 | { |
1366 | struct ftrace_event_file *file; | |
1367 | ||
1368 | list_for_each_entry(file, &tr->events, list) | |
c31ffb3f | 1369 | if (file->event_call == &tk->tp.call) |
41a7dd42 MH |
1370 | return file; |
1371 | ||
1372 | return NULL; | |
1373 | } | |
1374 | ||
3fe3d619 | 1375 | /* |
c31ffb3f | 1376 | * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this |
3fe3d619 ON |
1377 | * stage, we can do this lockless. |
1378 | */ | |
413d37d1 MH |
1379 | static __init int kprobe_trace_self_tests_init(void) |
1380 | { | |
231e36f4 | 1381 | int ret, warn = 0; |
413d37d1 | 1382 | int (*target)(int, int, int, int, int, int); |
c31ffb3f | 1383 | struct trace_kprobe *tk; |
41a7dd42 | 1384 | struct ftrace_event_file *file; |
413d37d1 MH |
1385 | |
1386 | target = kprobe_trace_selftest_target; | |
1387 | ||
1388 | pr_info("Testing kprobe tracing: "); | |
1389 | ||
8ab83f56 SD |
1390 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
1391 | "$stack $stack0 +0($stack)", | |
c31ffb3f | 1392 | create_trace_kprobe); |
231e36f4 | 1393 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1394 | pr_warn("error on probing function entry.\n"); |
231e36f4 MH |
1395 | warn++; |
1396 | } else { | |
1397 | /* Enable trace point */ | |
c31ffb3f NK |
1398 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1399 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1400 | pr_warn("error on getting new probe.\n"); |
231e36f4 | 1401 | warn++; |
41a7dd42 | 1402 | } else { |
c31ffb3f | 1403 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1404 | if (WARN_ON_ONCE(file == NULL)) { |
1405 | pr_warn("error on getting probe file.\n"); | |
1406 | warn++; | |
1407 | } else | |
c31ffb3f | 1408 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1409 | } |
231e36f4 | 1410 | } |
413d37d1 | 1411 | |
8ab83f56 | 1412 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
c31ffb3f | 1413 | "$retval", create_trace_kprobe); |
231e36f4 | 1414 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1415 | pr_warn("error on probing function return.\n"); |
231e36f4 MH |
1416 | warn++; |
1417 | } else { | |
1418 | /* Enable trace point */ | |
c31ffb3f NK |
1419 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1420 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1421 | pr_warn("error on getting 2nd new probe.\n"); |
231e36f4 | 1422 | warn++; |
41a7dd42 | 1423 | } else { |
c31ffb3f | 1424 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1425 | if (WARN_ON_ONCE(file == NULL)) { |
1426 | pr_warn("error on getting probe file.\n"); | |
1427 | warn++; | |
1428 | } else | |
c31ffb3f | 1429 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1430 | } |
231e36f4 MH |
1431 | } |
1432 | ||
1433 | if (warn) | |
1434 | goto end; | |
413d37d1 MH |
1435 | |
1436 | ret = target(1, 2, 3, 4, 5, 6); | |
1437 | ||
02ca1521 | 1438 | /* Disable trace points before removing it */ |
c31ffb3f NK |
1439 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1440 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1441 | pr_warn("error on getting test probe.\n"); |
02ca1521 | 1442 | warn++; |
41a7dd42 | 1443 | } else { |
c31ffb3f | 1444 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1445 | if (WARN_ON_ONCE(file == NULL)) { |
1446 | pr_warn("error on getting probe file.\n"); | |
1447 | warn++; | |
1448 | } else | |
c31ffb3f | 1449 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1450 | } |
02ca1521 | 1451 | |
c31ffb3f NK |
1452 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1453 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1454 | pr_warn("error on getting 2nd test probe.\n"); |
02ca1521 | 1455 | warn++; |
41a7dd42 | 1456 | } else { |
c31ffb3f | 1457 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1458 | if (WARN_ON_ONCE(file == NULL)) { |
1459 | pr_warn("error on getting probe file.\n"); | |
1460 | warn++; | |
1461 | } else | |
c31ffb3f | 1462 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1463 | } |
02ca1521 | 1464 | |
c31ffb3f | 1465 | ret = traceprobe_command("-:testprobe", create_trace_kprobe); |
231e36f4 | 1466 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1467 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1468 | warn++; |
1469 | } | |
1470 | ||
c31ffb3f | 1471 | ret = traceprobe_command("-:testprobe2", create_trace_kprobe); |
231e36f4 | 1472 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1473 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1474 | warn++; |
1475 | } | |
413d37d1 | 1476 | |
231e36f4 | 1477 | end: |
c31ffb3f | 1478 | release_all_trace_kprobes(); |
231e36f4 MH |
1479 | if (warn) |
1480 | pr_cont("NG: Some tests are failed. Please check them.\n"); | |
1481 | else | |
1482 | pr_cont("OK\n"); | |
413d37d1 MH |
1483 | return 0; |
1484 | } | |
1485 | ||
1486 | late_initcall(kprobe_trace_self_tests_init); | |
1487 | ||
1488 | #endif |