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 */ |
a7636d9e | 33 | unsigned long __percpu *nhit; |
413d37d1 | 34 | const char *symbol; /* symbol name */ |
c31ffb3f | 35 | struct trace_probe tp; |
413d37d1 MH |
36 | }; |
37 | ||
c31ffb3f NK |
38 | #define SIZEOF_TRACE_KPROBE(n) \ |
39 | (offsetof(struct trace_kprobe, tp.args) + \ | |
eca0d916 | 40 | (sizeof(struct probe_arg) * (n))) |
a82378d8 | 41 | |
93ccae7a | 42 | |
3da0f180 | 43 | static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk) |
413d37d1 | 44 | { |
c31ffb3f | 45 | return tk->rp.handler != NULL; |
413d37d1 MH |
46 | } |
47 | ||
3da0f180 | 48 | static nokprobe_inline const char *trace_kprobe_symbol(struct trace_kprobe *tk) |
413d37d1 | 49 | { |
c31ffb3f | 50 | return tk->symbol ? tk->symbol : "unknown"; |
413d37d1 MH |
51 | } |
52 | ||
3da0f180 | 53 | static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk) |
61424318 | 54 | { |
c31ffb3f | 55 | return tk->rp.kp.offset; |
61424318 MH |
56 | } |
57 | ||
3da0f180 | 58 | static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk) |
61424318 | 59 | { |
c31ffb3f | 60 | return !!(kprobe_gone(&tk->rp.kp)); |
61424318 MH |
61 | } |
62 | ||
3da0f180 | 63 | static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk, |
c31ffb3f | 64 | struct module *mod) |
61424318 MH |
65 | { |
66 | int len = strlen(mod->name); | |
c31ffb3f | 67 | const char *name = trace_kprobe_symbol(tk); |
61424318 MH |
68 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
69 | } | |
70 | ||
3da0f180 | 71 | static nokprobe_inline bool trace_kprobe_is_on_module(struct trace_kprobe *tk) |
61424318 | 72 | { |
c31ffb3f | 73 | return !!strchr(trace_kprobe_symbol(tk), ':'); |
61424318 MH |
74 | } |
75 | ||
c31ffb3f NK |
76 | static int register_kprobe_event(struct trace_kprobe *tk); |
77 | static int unregister_kprobe_event(struct trace_kprobe *tk); | |
413d37d1 MH |
78 | |
79 | static DEFINE_MUTEX(probe_lock); | |
80 | static LIST_HEAD(probe_list); | |
81 | ||
50d78056 MH |
82 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
83 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, | |
84 | struct pt_regs *regs); | |
85 | ||
1301a44e NK |
86 | /* Memory fetching by symbol */ |
87 | struct symbol_cache { | |
88 | char *symbol; | |
89 | long offset; | |
90 | unsigned long addr; | |
91 | }; | |
92 | ||
93 | unsigned long update_symbol_cache(struct symbol_cache *sc) | |
94 | { | |
95 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); | |
96 | ||
97 | if (sc->addr) | |
98 | sc->addr += sc->offset; | |
99 | ||
100 | return sc->addr; | |
101 | } | |
102 | ||
103 | void free_symbol_cache(struct symbol_cache *sc) | |
104 | { | |
105 | kfree(sc->symbol); | |
106 | kfree(sc); | |
107 | } | |
108 | ||
109 | struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) | |
110 | { | |
111 | struct symbol_cache *sc; | |
112 | ||
113 | if (!sym || strlen(sym) == 0) | |
114 | return NULL; | |
115 | ||
116 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); | |
117 | if (!sc) | |
118 | return NULL; | |
119 | ||
120 | sc->symbol = kstrdup(sym, GFP_KERNEL); | |
121 | if (!sc->symbol) { | |
122 | kfree(sc); | |
123 | return NULL; | |
124 | } | |
125 | sc->offset = offset; | |
126 | update_symbol_cache(sc); | |
127 | ||
128 | return sc; | |
129 | } | |
130 | ||
3fd996a2 NK |
131 | /* |
132 | * Kprobes-specific fetch functions | |
133 | */ | |
134 | #define DEFINE_FETCH_stack(type) \ | |
3da0f180 | 135 | static void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs, \ |
3fd996a2 NK |
136 | void *offset, void *dest) \ |
137 | { \ | |
138 | *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \ | |
139 | (unsigned int)((unsigned long)offset)); \ | |
3da0f180 MH |
140 | } \ |
141 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(stack, type)); | |
142 | ||
3fd996a2 NK |
143 | DEFINE_BASIC_FETCH_FUNCS(stack) |
144 | /* No string on the stack entry */ | |
145 | #define fetch_stack_string NULL | |
146 | #define fetch_stack_string_size NULL | |
147 | ||
5baaa59e | 148 | #define DEFINE_FETCH_memory(type) \ |
3da0f180 | 149 | static void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs, \ |
5baaa59e NK |
150 | void *addr, void *dest) \ |
151 | { \ | |
152 | type retval; \ | |
153 | if (probe_kernel_address(addr, retval)) \ | |
154 | *(type *)dest = 0; \ | |
155 | else \ | |
156 | *(type *)dest = retval; \ | |
3da0f180 MH |
157 | } \ |
158 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, type)); | |
159 | ||
5baaa59e NK |
160 | DEFINE_BASIC_FETCH_FUNCS(memory) |
161 | /* | |
162 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
163 | * length and relative data location. | |
164 | */ | |
3da0f180 MH |
165 | static void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, |
166 | void *addr, void *dest) | |
5baaa59e | 167 | { |
5baaa59e NK |
168 | int maxlen = get_rloc_len(*(u32 *)dest); |
169 | u8 *dst = get_rloc_data(dest); | |
1a6877b9 | 170 | long ret; |
5baaa59e NK |
171 | |
172 | if (!maxlen) | |
173 | return; | |
174 | ||
175 | /* | |
176 | * Try to get string again, since the string can be changed while | |
177 | * probing. | |
178 | */ | |
1a6877b9 | 179 | ret = strncpy_from_unsafe(dst, addr, maxlen); |
5baaa59e NK |
180 | |
181 | if (ret < 0) { /* Failed to fetch string */ | |
1a6877b9 | 182 | dst[0] = '\0'; |
5baaa59e NK |
183 | *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest)); |
184 | } else { | |
1a6877b9 | 185 | *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(*(u32 *)dest)); |
5baaa59e NK |
186 | } |
187 | } | |
3da0f180 | 188 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string)); |
5baaa59e NK |
189 | |
190 | /* Return the length of string -- including null terminal byte */ | |
3da0f180 MH |
191 | static void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, |
192 | void *addr, void *dest) | |
5baaa59e NK |
193 | { |
194 | mm_segment_t old_fs; | |
195 | int ret, len = 0; | |
196 | u8 c; | |
197 | ||
198 | old_fs = get_fs(); | |
199 | set_fs(KERNEL_DS); | |
200 | pagefault_disable(); | |
201 | ||
202 | do { | |
203 | ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1); | |
204 | len++; | |
205 | } while (c && ret == 0 && len < MAX_STRING_SIZE); | |
206 | ||
207 | pagefault_enable(); | |
208 | set_fs(old_fs); | |
209 | ||
210 | if (ret < 0) /* Failed to check the length */ | |
211 | *(u32 *)dest = 0; | |
212 | else | |
213 | *(u32 *)dest = len; | |
214 | } | |
3da0f180 | 215 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(memory, string_size)); |
5baaa59e | 216 | |
1301a44e | 217 | #define DEFINE_FETCH_symbol(type) \ |
3da0f180 | 218 | void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, void *data, void *dest)\ |
1301a44e NK |
219 | { \ |
220 | struct symbol_cache *sc = data; \ | |
221 | if (sc->addr) \ | |
222 | fetch_memory_##type(regs, (void *)sc->addr, dest); \ | |
223 | else \ | |
224 | *(type *)dest = 0; \ | |
3da0f180 MH |
225 | } \ |
226 | NOKPROBE_SYMBOL(FETCH_FUNC_NAME(symbol, type)); | |
227 | ||
1301a44e NK |
228 | DEFINE_BASIC_FETCH_FUNCS(symbol) |
229 | DEFINE_FETCH_symbol(string) | |
230 | DEFINE_FETCH_symbol(string_size) | |
231 | ||
b7e0bf34 NK |
232 | /* kprobes don't support file_offset fetch methods */ |
233 | #define fetch_file_offset_u8 NULL | |
234 | #define fetch_file_offset_u16 NULL | |
235 | #define fetch_file_offset_u32 NULL | |
236 | #define fetch_file_offset_u64 NULL | |
237 | #define fetch_file_offset_string NULL | |
238 | #define fetch_file_offset_string_size NULL | |
239 | ||
34fee3a1 | 240 | /* Fetch type information table */ |
d9a16d3a | 241 | static const struct fetch_type kprobes_fetch_type_table[] = { |
34fee3a1 NK |
242 | /* Special types */ |
243 | [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, | |
244 | sizeof(u32), 1, "__data_loc char[]"), | |
245 | [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, | |
246 | string_size, sizeof(u32), 0, "u32"), | |
247 | /* Basic types */ | |
248 | ASSIGN_FETCH_TYPE(u8, u8, 0), | |
249 | ASSIGN_FETCH_TYPE(u16, u16, 0), | |
250 | ASSIGN_FETCH_TYPE(u32, u32, 0), | |
251 | ASSIGN_FETCH_TYPE(u64, u64, 0), | |
252 | ASSIGN_FETCH_TYPE(s8, u8, 1), | |
253 | ASSIGN_FETCH_TYPE(s16, u16, 1), | |
254 | ASSIGN_FETCH_TYPE(s32, u32, 1), | |
255 | ASSIGN_FETCH_TYPE(s64, u64, 1), | |
256 | ||
257 | ASSIGN_FETCH_TYPE_END | |
258 | }; | |
259 | ||
4a846b44 MH |
260 | /* |
261 | * Allocate new trace_probe and initialize it (including kprobes). | |
262 | */ | |
c31ffb3f | 263 | static struct trace_kprobe *alloc_trace_kprobe(const char *group, |
f52487e9 | 264 | const char *event, |
4a846b44 MH |
265 | void *addr, |
266 | const char *symbol, | |
267 | unsigned long offs, | |
3a6b7666 | 268 | int nargs, bool is_return) |
413d37d1 | 269 | { |
c31ffb3f | 270 | struct trace_kprobe *tk; |
6f3cf440 | 271 | int ret = -ENOMEM; |
413d37d1 | 272 | |
c31ffb3f NK |
273 | tk = kzalloc(SIZEOF_TRACE_KPROBE(nargs), GFP_KERNEL); |
274 | if (!tk) | |
6f3cf440 | 275 | return ERR_PTR(ret); |
413d37d1 | 276 | |
a7636d9e MKL |
277 | tk->nhit = alloc_percpu(unsigned long); |
278 | if (!tk->nhit) | |
279 | goto error; | |
280 | ||
413d37d1 | 281 | if (symbol) { |
c31ffb3f NK |
282 | tk->symbol = kstrdup(symbol, GFP_KERNEL); |
283 | if (!tk->symbol) | |
413d37d1 | 284 | goto error; |
c31ffb3f NK |
285 | tk->rp.kp.symbol_name = tk->symbol; |
286 | tk->rp.kp.offset = offs; | |
4a846b44 | 287 | } else |
c31ffb3f | 288 | tk->rp.kp.addr = addr; |
4a846b44 MH |
289 | |
290 | if (is_return) | |
c31ffb3f | 291 | tk->rp.handler = kretprobe_dispatcher; |
4a846b44 | 292 | else |
c31ffb3f | 293 | tk->rp.kp.pre_handler = kprobe_dispatcher; |
4a846b44 | 294 | |
da34634f | 295 | if (!event || !is_good_name(event)) { |
6f3cf440 | 296 | ret = -EINVAL; |
4263565d | 297 | goto error; |
6f3cf440 MH |
298 | } |
299 | ||
c31ffb3f NK |
300 | tk->tp.call.class = &tk->tp.class; |
301 | tk->tp.call.name = kstrdup(event, GFP_KERNEL); | |
302 | if (!tk->tp.call.name) | |
4263565d | 303 | goto error; |
413d37d1 | 304 | |
da34634f | 305 | if (!group || !is_good_name(group)) { |
6f3cf440 | 306 | ret = -EINVAL; |
f52487e9 | 307 | goto error; |
6f3cf440 MH |
308 | } |
309 | ||
c31ffb3f NK |
310 | tk->tp.class.system = kstrdup(group, GFP_KERNEL); |
311 | if (!tk->tp.class.system) | |
f52487e9 MH |
312 | goto error; |
313 | ||
c31ffb3f NK |
314 | INIT_LIST_HEAD(&tk->list); |
315 | INIT_LIST_HEAD(&tk->tp.files); | |
316 | return tk; | |
413d37d1 | 317 | error: |
c31ffb3f NK |
318 | kfree(tk->tp.call.name); |
319 | kfree(tk->symbol); | |
a7636d9e | 320 | free_percpu(tk->nhit); |
c31ffb3f | 321 | kfree(tk); |
6f3cf440 | 322 | return ERR_PTR(ret); |
413d37d1 MH |
323 | } |
324 | ||
c31ffb3f | 325 | static void free_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 MH |
326 | { |
327 | int i; | |
328 | ||
c31ffb3f NK |
329 | for (i = 0; i < tk->tp.nr_args; i++) |
330 | traceprobe_free_probe_arg(&tk->tp.args[i]); | |
413d37d1 | 331 | |
c31ffb3f NK |
332 | kfree(tk->tp.call.class->system); |
333 | kfree(tk->tp.call.name); | |
334 | kfree(tk->symbol); | |
a7636d9e | 335 | free_percpu(tk->nhit); |
c31ffb3f | 336 | kfree(tk); |
413d37d1 MH |
337 | } |
338 | ||
c31ffb3f NK |
339 | static struct trace_kprobe *find_trace_kprobe(const char *event, |
340 | const char *group) | |
413d37d1 | 341 | { |
c31ffb3f | 342 | struct trace_kprobe *tk; |
413d37d1 | 343 | |
c31ffb3f | 344 | list_for_each_entry(tk, &probe_list, list) |
687fcc4a | 345 | if (strcmp(trace_event_name(&tk->tp.call), event) == 0 && |
c31ffb3f NK |
346 | strcmp(tk->tp.call.class->system, group) == 0) |
347 | return tk; | |
413d37d1 MH |
348 | return NULL; |
349 | } | |
350 | ||
41a7dd42 MH |
351 | /* |
352 | * Enable trace_probe | |
353 | * if the file is NULL, enable "perf" handler, or enable "trace" handler. | |
354 | */ | |
355 | static int | |
7f1d2f82 | 356 | enable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) |
1538f888 MH |
357 | { |
358 | int ret = 0; | |
359 | ||
41a7dd42 | 360 | if (file) { |
b04d52e3 ON |
361 | struct event_file_link *link; |
362 | ||
363 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
364 | if (!link) { | |
41a7dd42 | 365 | ret = -ENOMEM; |
3fe3d619 | 366 | goto out; |
41a7dd42 | 367 | } |
41a7dd42 | 368 | |
b04d52e3 | 369 | link->file = file; |
c31ffb3f | 370 | list_add_tail_rcu(&link->list, &tk->tp.files); |
41a7dd42 | 371 | |
c31ffb3f | 372 | tk->tp.flags |= TP_FLAG_TRACE; |
41a7dd42 | 373 | } else |
c31ffb3f | 374 | tk->tp.flags |= TP_FLAG_PROFILE; |
41a7dd42 | 375 | |
c31ffb3f NK |
376 | if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) { |
377 | if (trace_kprobe_is_return(tk)) | |
378 | ret = enable_kretprobe(&tk->rp); | |
1538f888 | 379 | else |
c31ffb3f | 380 | ret = enable_kprobe(&tk->rp.kp); |
1538f888 | 381 | } |
3fe3d619 | 382 | out: |
1538f888 MH |
383 | return ret; |
384 | } | |
385 | ||
41a7dd42 MH |
386 | /* |
387 | * Disable trace_probe | |
388 | * if the file is NULL, disable "perf" handler, or disable "trace" handler. | |
389 | */ | |
390 | static int | |
7f1d2f82 | 391 | disable_trace_kprobe(struct trace_kprobe *tk, struct trace_event_file *file) |
1538f888 | 392 | { |
a232e270 MH |
393 | struct event_file_link *link = NULL; |
394 | int wait = 0; | |
41a7dd42 MH |
395 | int ret = 0; |
396 | ||
41a7dd42 | 397 | if (file) { |
c31ffb3f | 398 | link = find_event_file_link(&tk->tp, file); |
b04d52e3 | 399 | if (!link) { |
41a7dd42 | 400 | ret = -EINVAL; |
3fe3d619 | 401 | goto out; |
41a7dd42 MH |
402 | } |
403 | ||
b04d52e3 | 404 | list_del_rcu(&link->list); |
a232e270 | 405 | wait = 1; |
c31ffb3f | 406 | if (!list_empty(&tk->tp.files)) |
b04d52e3 | 407 | goto out; |
41a7dd42 | 408 | |
c31ffb3f | 409 | tk->tp.flags &= ~TP_FLAG_TRACE; |
41a7dd42 | 410 | } else |
c31ffb3f | 411 | tk->tp.flags &= ~TP_FLAG_PROFILE; |
41a7dd42 | 412 | |
c31ffb3f NK |
413 | if (!trace_probe_is_enabled(&tk->tp) && trace_probe_is_registered(&tk->tp)) { |
414 | if (trace_kprobe_is_return(tk)) | |
415 | disable_kretprobe(&tk->rp); | |
1538f888 | 416 | else |
c31ffb3f | 417 | disable_kprobe(&tk->rp.kp); |
a232e270 | 418 | wait = 1; |
1538f888 | 419 | } |
3fe3d619 | 420 | out: |
a232e270 MH |
421 | if (wait) { |
422 | /* | |
423 | * Synchronize with kprobe_trace_func/kretprobe_trace_func | |
424 | * to ensure disabled (all running handlers are finished). | |
425 | * This is not only for kfree(), but also the caller, | |
426 | * trace_remove_event_call() supposes it for releasing | |
427 | * event_call related objects, which will be accessed in | |
428 | * the kprobe_trace_func/kretprobe_trace_func. | |
429 | */ | |
430 | synchronize_sched(); | |
431 | kfree(link); /* Ignored if link == NULL */ | |
432 | } | |
433 | ||
41a7dd42 | 434 | return ret; |
1538f888 MH |
435 | } |
436 | ||
61424318 | 437 | /* Internal register function - just handle k*probes and flags */ |
c31ffb3f | 438 | static int __register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 439 | { |
7f6878a3 | 440 | int i, ret; |
61424318 | 441 | |
c31ffb3f | 442 | if (trace_probe_is_registered(&tk->tp)) |
61424318 MH |
443 | return -EINVAL; |
444 | ||
c31ffb3f NK |
445 | for (i = 0; i < tk->tp.nr_args; i++) |
446 | traceprobe_update_arg(&tk->tp.args[i]); | |
7f6878a3 | 447 | |
61424318 | 448 | /* Set/clear disabled flag according to tp->flag */ |
c31ffb3f NK |
449 | if (trace_probe_is_enabled(&tk->tp)) |
450 | tk->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; | |
61424318 | 451 | else |
c31ffb3f | 452 | tk->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
61424318 | 453 | |
c31ffb3f NK |
454 | if (trace_kprobe_is_return(tk)) |
455 | ret = register_kretprobe(&tk->rp); | |
413d37d1 | 456 | else |
c31ffb3f | 457 | ret = register_kprobe(&tk->rp.kp); |
61424318 MH |
458 | |
459 | if (ret == 0) | |
c31ffb3f | 460 | tk->tp.flags |= TP_FLAG_REGISTERED; |
61424318 | 461 | else { |
a395d6a7 JP |
462 | pr_warn("Could not insert probe at %s+%lu: %d\n", |
463 | trace_kprobe_symbol(tk), trace_kprobe_offset(tk), ret); | |
c31ffb3f | 464 | if (ret == -ENOENT && trace_kprobe_is_on_module(tk)) { |
a395d6a7 | 465 | pr_warn("This probe might be able to register after target module is loaded. Continue.\n"); |
61424318 MH |
466 | ret = 0; |
467 | } else if (ret == -EILSEQ) { | |
a395d6a7 JP |
468 | pr_warn("Probing address(0x%p) is not an instruction boundary.\n", |
469 | tk->rp.kp.addr); | |
61424318 MH |
470 | ret = -EINVAL; |
471 | } | |
472 | } | |
473 | ||
474 | return ret; | |
475 | } | |
476 | ||
477 | /* Internal unregister function - just handle k*probes and flags */ | |
c31ffb3f | 478 | static void __unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 479 | { |
c31ffb3f NK |
480 | if (trace_probe_is_registered(&tk->tp)) { |
481 | if (trace_kprobe_is_return(tk)) | |
482 | unregister_kretprobe(&tk->rp); | |
61424318 | 483 | else |
c31ffb3f NK |
484 | unregister_kprobe(&tk->rp.kp); |
485 | tk->tp.flags &= ~TP_FLAG_REGISTERED; | |
61424318 | 486 | /* Cleanup kprobe for reuse */ |
c31ffb3f NK |
487 | if (tk->rp.kp.symbol_name) |
488 | tk->rp.kp.addr = NULL; | |
61424318 MH |
489 | } |
490 | } | |
491 | ||
492 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ | |
c31ffb3f | 493 | static int unregister_trace_kprobe(struct trace_kprobe *tk) |
61424318 | 494 | { |
02ca1521 | 495 | /* Enabled event can not be unregistered */ |
c31ffb3f | 496 | if (trace_probe_is_enabled(&tk->tp)) |
02ca1521 MH |
497 | return -EBUSY; |
498 | ||
40c32592 | 499 | /* Will fail if probe is being used by ftrace or perf */ |
c31ffb3f | 500 | if (unregister_kprobe_event(tk)) |
40c32592 SRRH |
501 | return -EBUSY; |
502 | ||
c31ffb3f NK |
503 | __unregister_trace_kprobe(tk); |
504 | list_del(&tk->list); | |
02ca1521 MH |
505 | |
506 | return 0; | |
413d37d1 MH |
507 | } |
508 | ||
509 | /* Register a trace_probe and probe_event */ | |
c31ffb3f | 510 | static int register_trace_kprobe(struct trace_kprobe *tk) |
413d37d1 | 511 | { |
c31ffb3f | 512 | struct trace_kprobe *old_tk; |
413d37d1 MH |
513 | int ret; |
514 | ||
515 | mutex_lock(&probe_lock); | |
516 | ||
61424318 | 517 | /* Delete old (same name) event if exist */ |
687fcc4a | 518 | old_tk = find_trace_kprobe(trace_event_name(&tk->tp.call), |
de7b2973 | 519 | tk->tp.call.class->system); |
c31ffb3f NK |
520 | if (old_tk) { |
521 | ret = unregister_trace_kprobe(old_tk); | |
02ca1521 MH |
522 | if (ret < 0) |
523 | goto end; | |
c31ffb3f | 524 | free_trace_kprobe(old_tk); |
2d5e067e | 525 | } |
61424318 MH |
526 | |
527 | /* Register new event */ | |
c31ffb3f | 528 | ret = register_kprobe_event(tk); |
2d5e067e | 529 | if (ret) { |
a395d6a7 | 530 | pr_warn("Failed to register probe event(%d)\n", ret); |
2d5e067e MH |
531 | goto end; |
532 | } | |
533 | ||
61424318 | 534 | /* Register k*probe */ |
c31ffb3f | 535 | ret = __register_trace_kprobe(tk); |
61424318 | 536 | if (ret < 0) |
c31ffb3f | 537 | unregister_kprobe_event(tk); |
61424318 | 538 | else |
c31ffb3f | 539 | list_add_tail(&tk->list, &probe_list); |
61424318 | 540 | |
413d37d1 MH |
541 | end: |
542 | mutex_unlock(&probe_lock); | |
543 | return ret; | |
544 | } | |
545 | ||
61424318 | 546 | /* Module notifier call back, checking event on the module */ |
c31ffb3f | 547 | static int trace_kprobe_module_callback(struct notifier_block *nb, |
61424318 MH |
548 | unsigned long val, void *data) |
549 | { | |
550 | struct module *mod = data; | |
c31ffb3f | 551 | struct trace_kprobe *tk; |
61424318 MH |
552 | int ret; |
553 | ||
554 | if (val != MODULE_STATE_COMING) | |
555 | return NOTIFY_DONE; | |
556 | ||
557 | /* Update probes on coming module */ | |
558 | mutex_lock(&probe_lock); | |
c31ffb3f NK |
559 | list_for_each_entry(tk, &probe_list, list) { |
560 | if (trace_kprobe_within_module(tk, mod)) { | |
02ca1521 | 561 | /* Don't need to check busy - this should have gone. */ |
c31ffb3f NK |
562 | __unregister_trace_kprobe(tk); |
563 | ret = __register_trace_kprobe(tk); | |
61424318 | 564 | if (ret) |
a395d6a7 JP |
565 | pr_warn("Failed to re-register probe %s on %s: %d\n", |
566 | trace_event_name(&tk->tp.call), | |
567 | mod->name, ret); | |
61424318 MH |
568 | } |
569 | } | |
570 | mutex_unlock(&probe_lock); | |
571 | ||
572 | return NOTIFY_DONE; | |
573 | } | |
574 | ||
c31ffb3f NK |
575 | static struct notifier_block trace_kprobe_module_nb = { |
576 | .notifier_call = trace_kprobe_module_callback, | |
61424318 MH |
577 | .priority = 1 /* Invoked after kprobe module callback */ |
578 | }; | |
579 | ||
c31ffb3f | 580 | static int create_trace_kprobe(int argc, char **argv) |
413d37d1 MH |
581 | { |
582 | /* | |
583 | * Argument syntax: | |
61424318 MH |
584 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
585 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] | |
413d37d1 | 586 | * Fetch args: |
2e06ff63 MH |
587 | * $retval : fetch return value |
588 | * $stack : fetch stack address | |
589 | * $stackN : fetch Nth of stack (N:0-) | |
35abb67d | 590 | * $comm : fetch current task comm |
413d37d1 MH |
591 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
592 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) | |
593 | * %REG : fetch register REG | |
93ccae7a | 594 | * Dereferencing memory fetch: |
413d37d1 | 595 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
eca0d916 MH |
596 | * Alias name of args: |
597 | * NAME=FETCHARG : set NAME as alias of FETCHARG. | |
93ccae7a MH |
598 | * Type of args: |
599 | * FETCHARG:TYPE : use TYPE instead of unsigned long. | |
413d37d1 | 600 | */ |
c31ffb3f | 601 | struct trace_kprobe *tk; |
413d37d1 | 602 | int i, ret = 0; |
3a6b7666 | 603 | bool is_return = false, is_delete = false; |
93ccae7a | 604 | char *symbol = NULL, *event = NULL, *group = NULL; |
da34634f | 605 | char *arg; |
2fba0c88 | 606 | unsigned long offset = 0; |
413d37d1 | 607 | void *addr = NULL; |
4a846b44 | 608 | char buf[MAX_EVENT_NAME_LEN]; |
413d37d1 | 609 | |
a7c312be | 610 | /* argc must be >= 1 */ |
413d37d1 | 611 | if (argv[0][0] == 'p') |
3a6b7666 | 612 | is_return = false; |
413d37d1 | 613 | else if (argv[0][0] == 'r') |
3a6b7666 | 614 | is_return = true; |
a7c312be | 615 | else if (argv[0][0] == '-') |
3a6b7666 | 616 | is_delete = true; |
e63cc239 | 617 | else { |
a7c312be MH |
618 | pr_info("Probe definition must be started with 'p', 'r' or" |
619 | " '-'.\n"); | |
413d37d1 | 620 | return -EINVAL; |
e63cc239 | 621 | } |
413d37d1 MH |
622 | |
623 | if (argv[0][1] == ':') { | |
624 | event = &argv[0][2]; | |
f52487e9 MH |
625 | if (strchr(event, '/')) { |
626 | group = event; | |
627 | event = strchr(group, '/') + 1; | |
628 | event[-1] = '\0'; | |
629 | if (strlen(group) == 0) { | |
a5efd925 | 630 | pr_info("Group name is not specified\n"); |
f52487e9 MH |
631 | return -EINVAL; |
632 | } | |
633 | } | |
413d37d1 | 634 | if (strlen(event) == 0) { |
a5efd925 | 635 | pr_info("Event name is not specified\n"); |
413d37d1 MH |
636 | return -EINVAL; |
637 | } | |
638 | } | |
a7c312be MH |
639 | if (!group) |
640 | group = KPROBE_EVENT_SYSTEM; | |
413d37d1 | 641 | |
a7c312be MH |
642 | if (is_delete) { |
643 | if (!event) { | |
644 | pr_info("Delete command needs an event name.\n"); | |
645 | return -EINVAL; | |
646 | } | |
9da79ab8 | 647 | mutex_lock(&probe_lock); |
c31ffb3f NK |
648 | tk = find_trace_kprobe(event, group); |
649 | if (!tk) { | |
9da79ab8 | 650 | mutex_unlock(&probe_lock); |
a7c312be MH |
651 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
652 | return -ENOENT; | |
653 | } | |
654 | /* delete an event */ | |
c31ffb3f | 655 | ret = unregister_trace_kprobe(tk); |
02ca1521 | 656 | if (ret == 0) |
c31ffb3f | 657 | free_trace_kprobe(tk); |
9da79ab8 | 658 | mutex_unlock(&probe_lock); |
02ca1521 | 659 | return ret; |
a7c312be MH |
660 | } |
661 | ||
662 | if (argc < 2) { | |
663 | pr_info("Probe point is not specified.\n"); | |
664 | return -EINVAL; | |
665 | } | |
413d37d1 | 666 | if (isdigit(argv[1][0])) { |
e63cc239 MH |
667 | if (is_return) { |
668 | pr_info("Return probe point must be a symbol.\n"); | |
413d37d1 | 669 | return -EINVAL; |
e63cc239 | 670 | } |
413d37d1 | 671 | /* an address specified */ |
bcd83ea6 | 672 | ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); |
e63cc239 MH |
673 | if (ret) { |
674 | pr_info("Failed to parse address.\n"); | |
413d37d1 | 675 | return ret; |
e63cc239 | 676 | } |
413d37d1 MH |
677 | } else { |
678 | /* a symbol specified */ | |
679 | symbol = argv[1]; | |
680 | /* TODO: support .init module functions */ | |
8ab83f56 | 681 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
e63cc239 MH |
682 | if (ret) { |
683 | pr_info("Failed to parse symbol.\n"); | |
413d37d1 | 684 | return ret; |
e63cc239 MH |
685 | } |
686 | if (offset && is_return) { | |
687 | pr_info("Return probe must be used without offset.\n"); | |
413d37d1 | 688 | return -EINVAL; |
e63cc239 | 689 | } |
413d37d1 | 690 | } |
a82378d8 | 691 | argc -= 2; argv += 2; |
413d37d1 MH |
692 | |
693 | /* setup a probe */ | |
4263565d MH |
694 | if (!event) { |
695 | /* Make a new event name */ | |
4263565d | 696 | if (symbol) |
6f3cf440 | 697 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
4263565d MH |
698 | is_return ? 'r' : 'p', symbol, offset); |
699 | else | |
6f3cf440 | 700 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
4263565d | 701 | is_return ? 'r' : 'p', addr); |
4a846b44 MH |
702 | event = buf; |
703 | } | |
c31ffb3f | 704 | tk = alloc_trace_kprobe(group, event, addr, symbol, offset, argc, |
f52487e9 | 705 | is_return); |
c31ffb3f | 706 | if (IS_ERR(tk)) { |
e63cc239 | 707 | pr_info("Failed to allocate trace_probe.(%d)\n", |
c31ffb3f NK |
708 | (int)PTR_ERR(tk)); |
709 | return PTR_ERR(tk); | |
e63cc239 | 710 | } |
413d37d1 | 711 | |
413d37d1 | 712 | /* parse arguments */ |
a82378d8 MH |
713 | ret = 0; |
714 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { | |
c31ffb3f NK |
715 | struct probe_arg *parg = &tk->tp.args[i]; |
716 | ||
61a52736 | 717 | /* Increment count for freeing args in error case */ |
c31ffb3f | 718 | tk->tp.nr_args++; |
61a52736 | 719 | |
eca0d916 MH |
720 | /* Parse argument name */ |
721 | arg = strchr(argv[i], '='); | |
aba91595 | 722 | if (arg) { |
eca0d916 | 723 | *arg++ = '\0'; |
c31ffb3f | 724 | parg->name = kstrdup(argv[i], GFP_KERNEL); |
aba91595 | 725 | } else { |
eca0d916 | 726 | arg = argv[i]; |
aba91595 MH |
727 | /* If argument name is omitted, set "argN" */ |
728 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); | |
c31ffb3f | 729 | parg->name = kstrdup(buf, GFP_KERNEL); |
aba91595 | 730 | } |
a703d946 | 731 | |
c31ffb3f | 732 | if (!parg->name) { |
aba91595 | 733 | pr_info("Failed to allocate argument[%d] name.\n", i); |
ba8665d7 | 734 | ret = -ENOMEM; |
413d37d1 MH |
735 | goto error; |
736 | } | |
da34634f | 737 | |
c31ffb3f | 738 | if (!is_good_name(parg->name)) { |
da34634f | 739 | pr_info("Invalid argument[%d] name: %s\n", |
c31ffb3f | 740 | i, parg->name); |
da34634f MH |
741 | ret = -EINVAL; |
742 | goto error; | |
743 | } | |
93ccae7a | 744 | |
c31ffb3f NK |
745 | if (traceprobe_conflict_field_name(parg->name, |
746 | tk->tp.args, i)) { | |
aba91595 | 747 | pr_info("Argument[%d] name '%s' conflicts with " |
93ccae7a MH |
748 | "another field.\n", i, argv[i]); |
749 | ret = -EINVAL; | |
750 | goto error; | |
751 | } | |
ba8665d7 MH |
752 | |
753 | /* Parse fetch argument */ | |
c31ffb3f | 754 | ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg, |
d9a16d3a SR |
755 | is_return, true, |
756 | kprobes_fetch_type_table); | |
e63cc239 | 757 | if (ret) { |
aba91595 | 758 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
413d37d1 | 759 | goto error; |
e63cc239 | 760 | } |
413d37d1 | 761 | } |
413d37d1 | 762 | |
c31ffb3f | 763 | ret = register_trace_kprobe(tk); |
413d37d1 MH |
764 | if (ret) |
765 | goto error; | |
766 | return 0; | |
767 | ||
768 | error: | |
c31ffb3f | 769 | free_trace_kprobe(tk); |
413d37d1 MH |
770 | return ret; |
771 | } | |
772 | ||
c31ffb3f | 773 | static int release_all_trace_kprobes(void) |
413d37d1 | 774 | { |
c31ffb3f | 775 | struct trace_kprobe *tk; |
02ca1521 | 776 | int ret = 0; |
413d37d1 MH |
777 | |
778 | mutex_lock(&probe_lock); | |
02ca1521 | 779 | /* Ensure no probe is in use. */ |
c31ffb3f NK |
780 | list_for_each_entry(tk, &probe_list, list) |
781 | if (trace_probe_is_enabled(&tk->tp)) { | |
02ca1521 MH |
782 | ret = -EBUSY; |
783 | goto end; | |
784 | } | |
413d37d1 MH |
785 | /* TODO: Use batch unregistration */ |
786 | while (!list_empty(&probe_list)) { | |
c31ffb3f NK |
787 | tk = list_entry(probe_list.next, struct trace_kprobe, list); |
788 | ret = unregister_trace_kprobe(tk); | |
40c32592 SRRH |
789 | if (ret) |
790 | goto end; | |
c31ffb3f | 791 | free_trace_kprobe(tk); |
413d37d1 | 792 | } |
02ca1521 MH |
793 | |
794 | end: | |
413d37d1 | 795 | mutex_unlock(&probe_lock); |
02ca1521 MH |
796 | |
797 | return ret; | |
413d37d1 MH |
798 | } |
799 | ||
413d37d1 MH |
800 | /* Probes listing interfaces */ |
801 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) | |
802 | { | |
803 | mutex_lock(&probe_lock); | |
804 | return seq_list_start(&probe_list, *pos); | |
805 | } | |
806 | ||
807 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
808 | { | |
809 | return seq_list_next(v, &probe_list, pos); | |
810 | } | |
811 | ||
812 | static void probes_seq_stop(struct seq_file *m, void *v) | |
813 | { | |
814 | mutex_unlock(&probe_lock); | |
815 | } | |
816 | ||
817 | static int probes_seq_show(struct seq_file *m, void *v) | |
818 | { | |
c31ffb3f | 819 | struct trace_kprobe *tk = v; |
93ccae7a | 820 | int i; |
413d37d1 | 821 | |
fa6f0cc7 | 822 | seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p'); |
de7b2973 | 823 | seq_printf(m, ":%s/%s", tk->tp.call.class->system, |
687fcc4a | 824 | trace_event_name(&tk->tp.call)); |
413d37d1 | 825 | |
c31ffb3f NK |
826 | if (!tk->symbol) |
827 | seq_printf(m, " 0x%p", tk->rp.kp.addr); | |
828 | else if (tk->rp.kp.offset) | |
829 | seq_printf(m, " %s+%u", trace_kprobe_symbol(tk), | |
830 | tk->rp.kp.offset); | |
413d37d1 | 831 | else |
c31ffb3f | 832 | seq_printf(m, " %s", trace_kprobe_symbol(tk)); |
413d37d1 | 833 | |
c31ffb3f NK |
834 | for (i = 0; i < tk->tp.nr_args; i++) |
835 | seq_printf(m, " %s=%s", tk->tp.args[i].name, tk->tp.args[i].comm); | |
fa6f0cc7 | 836 | seq_putc(m, '\n'); |
93ccae7a | 837 | |
413d37d1 MH |
838 | return 0; |
839 | } | |
840 | ||
841 | static const struct seq_operations probes_seq_op = { | |
842 | .start = probes_seq_start, | |
843 | .next = probes_seq_next, | |
844 | .stop = probes_seq_stop, | |
845 | .show = probes_seq_show | |
846 | }; | |
847 | ||
848 | static int probes_open(struct inode *inode, struct file *file) | |
849 | { | |
02ca1521 MH |
850 | int ret; |
851 | ||
852 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { | |
c31ffb3f | 853 | ret = release_all_trace_kprobes(); |
02ca1521 MH |
854 | if (ret < 0) |
855 | return ret; | |
856 | } | |
413d37d1 MH |
857 | |
858 | return seq_open(file, &probes_seq_op); | |
859 | } | |
860 | ||
413d37d1 MH |
861 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
862 | size_t count, loff_t *ppos) | |
863 | { | |
8ab83f56 | 864 | return traceprobe_probes_write(file, buffer, count, ppos, |
c31ffb3f | 865 | create_trace_kprobe); |
413d37d1 MH |
866 | } |
867 | ||
868 | static const struct file_operations kprobe_events_ops = { | |
869 | .owner = THIS_MODULE, | |
870 | .open = probes_open, | |
871 | .read = seq_read, | |
872 | .llseek = seq_lseek, | |
873 | .release = seq_release, | |
874 | .write = probes_write, | |
875 | }; | |
876 | ||
cd7e7bd5 MH |
877 | /* Probes profiling interfaces */ |
878 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
879 | { | |
c31ffb3f | 880 | struct trace_kprobe *tk = v; |
a7636d9e MKL |
881 | unsigned long nhit = 0; |
882 | int cpu; | |
883 | ||
884 | for_each_possible_cpu(cpu) | |
885 | nhit += *per_cpu_ptr(tk->nhit, cpu); | |
cd7e7bd5 | 886 | |
de7b2973 | 887 | seq_printf(m, " %-44s %15lu %15lu\n", |
a7636d9e | 888 | trace_event_name(&tk->tp.call), nhit, |
c31ffb3f | 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 */ |
3da0f180 | 915 | static nokprobe_inline void |
c31ffb3f | 916 | __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs, |
7f1d2f82 | 917 | struct trace_event_file *trace_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; |
2425bcb9 | 924 | struct trace_event_call *call = &tk->tp.call; |
413d37d1 | 925 | |
7f1d2f82 | 926 | WARN_ON(call != trace_file->event_call); |
41a7dd42 | 927 | |
09a5059a | 928 | if (trace_trigger_soft_disabled(trace_file)) |
13a1e4ae | 929 | return; |
b8820084 | 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 | |
7f1d2f82 | 937 | event = trace_event_buffer_lock_reserve(&buffer, trace_file, |
41a7dd42 MH |
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 | |
7f1d2f82 | 947 | event_trigger_unlock_commit_regs(trace_file, buffer, event, |
13a1e4ae | 948 | entry, irq_flags, pc, regs); |
413d37d1 MH |
949 | } |
950 | ||
3da0f180 | 951 | static void |
c31ffb3f | 952 | kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs) |
41a7dd42 | 953 | { |
b04d52e3 | 954 | struct event_file_link *link; |
41a7dd42 | 955 | |
c31ffb3f NK |
956 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
957 | __kprobe_trace_func(tk, regs, link->file); | |
41a7dd42 | 958 | } |
3da0f180 | 959 | NOKPROBE_SYMBOL(kprobe_trace_func); |
41a7dd42 | 960 | |
413d37d1 | 961 | /* Kretprobe handler */ |
3da0f180 | 962 | static nokprobe_inline void |
c31ffb3f | 963 | __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 | 964 | struct pt_regs *regs, |
7f1d2f82 | 965 | struct trace_event_file *trace_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; |
2425bcb9 | 972 | struct trace_event_call *call = &tk->tp.call; |
413d37d1 | 973 | |
7f1d2f82 | 974 | WARN_ON(call != trace_file->event_call); |
41a7dd42 | 975 | |
09a5059a | 976 | if (trace_trigger_soft_disabled(trace_file)) |
13a1e4ae | 977 | return; |
b8820084 | 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 | |
7f1d2f82 | 985 | event = trace_event_buffer_lock_reserve(&buffer, trace_file, |
41a7dd42 MH |
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 | |
7f1d2f82 | 996 | event_trigger_unlock_commit_regs(trace_file, buffer, event, |
13a1e4ae | 997 | entry, irq_flags, pc, regs); |
413d37d1 MH |
998 | } |
999 | ||
3da0f180 | 1000 | static void |
c31ffb3f | 1001 | kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
41a7dd42 MH |
1002 | struct pt_regs *regs) |
1003 | { | |
b04d52e3 | 1004 | struct event_file_link *link; |
41a7dd42 | 1005 | |
c31ffb3f NK |
1006 | list_for_each_entry_rcu(link, &tk->tp.files, list) |
1007 | __kretprobe_trace_func(tk, ri, regs, link->file); | |
41a7dd42 | 1008 | } |
3da0f180 | 1009 | NOKPROBE_SYMBOL(kretprobe_trace_func); |
41a7dd42 | 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 | |
687fcc4a | 1025 | trace_seq_printf(s, "%s: (", trace_event_name(&tp->call)); |
6e9f23d1 | 1026 | |
413d37d1 | 1027 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
85224da0 | 1028 | goto out; |
413d37d1 | 1029 | |
85224da0 | 1030 | trace_seq_putc(s, ')'); |
413d37d1 | 1031 | |
93ccae7a MH |
1032 | data = (u8 *)&field[1]; |
1033 | for (i = 0; i < tp->nr_args; i++) | |
1034 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1035 | data + tp->args[i].offset, field)) |
85224da0 | 1036 | goto out; |
413d37d1 | 1037 | |
85224da0 SRRH |
1038 | trace_seq_putc(s, '\n'); |
1039 | out: | |
1040 | return trace_handle_return(s); | |
413d37d1 MH |
1041 | } |
1042 | ||
b62fdd97 | 1043 | static enum print_line_t |
a9a57763 SR |
1044 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
1045 | struct trace_event *event) | |
413d37d1 | 1046 | { |
93ccae7a | 1047 | struct kretprobe_trace_entry_head *field; |
413d37d1 | 1048 | struct trace_seq *s = &iter->seq; |
eca0d916 | 1049 | struct trace_probe *tp; |
93ccae7a | 1050 | u8 *data; |
413d37d1 MH |
1051 | int i; |
1052 | ||
93ccae7a | 1053 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
80decc70 | 1054 | tp = container_of(event, struct trace_probe, call.event); |
413d37d1 | 1055 | |
687fcc4a | 1056 | trace_seq_printf(s, "%s: (", trace_event_name(&tp->call)); |
6e9f23d1 | 1057 | |
413d37d1 | 1058 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
85224da0 | 1059 | goto out; |
413d37d1 | 1060 | |
85224da0 | 1061 | trace_seq_puts(s, " <- "); |
413d37d1 MH |
1062 | |
1063 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) | |
85224da0 | 1064 | goto out; |
413d37d1 | 1065 | |
85224da0 | 1066 | trace_seq_putc(s, ')'); |
413d37d1 | 1067 | |
93ccae7a MH |
1068 | data = (u8 *)&field[1]; |
1069 | for (i = 0; i < tp->nr_args; i++) | |
1070 | if (!tp->args[i].type->print(s, tp->args[i].name, | |
e09c8614 | 1071 | data + tp->args[i].offset, field)) |
85224da0 | 1072 | goto out; |
413d37d1 | 1073 | |
85224da0 | 1074 | trace_seq_putc(s, '\n'); |
413d37d1 | 1075 | |
85224da0 SRRH |
1076 | out: |
1077 | return trace_handle_return(s); | |
413d37d1 MH |
1078 | } |
1079 | ||
413d37d1 | 1080 | |
2425bcb9 | 1081 | static int kprobe_event_define_fields(struct trace_event_call *event_call) |
413d37d1 MH |
1082 | { |
1083 | int ret, i; | |
93ccae7a | 1084 | struct kprobe_trace_entry_head field; |
c31ffb3f | 1085 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1086 | |
a703d946 | 1087 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
eca0d916 | 1088 | /* Set argument names as fields */ |
c31ffb3f NK |
1089 | for (i = 0; i < tk->tp.nr_args; i++) { |
1090 | struct probe_arg *parg = &tk->tp.args[i]; | |
1091 | ||
1092 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1093 | parg->name, | |
1094 | sizeof(field) + parg->offset, | |
1095 | parg->type->size, | |
1096 | parg->type->is_signed, | |
93ccae7a MH |
1097 | FILTER_OTHER); |
1098 | if (ret) | |
1099 | return ret; | |
1100 | } | |
413d37d1 MH |
1101 | return 0; |
1102 | } | |
1103 | ||
2425bcb9 | 1104 | static int kretprobe_event_define_fields(struct trace_event_call *event_call) |
413d37d1 MH |
1105 | { |
1106 | int ret, i; | |
93ccae7a | 1107 | struct kretprobe_trace_entry_head field; |
c31ffb3f | 1108 | struct trace_kprobe *tk = (struct trace_kprobe *)event_call->data; |
413d37d1 | 1109 | |
a703d946 MH |
1110 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
1111 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); | |
eca0d916 | 1112 | /* Set argument names as fields */ |
c31ffb3f NK |
1113 | for (i = 0; i < tk->tp.nr_args; i++) { |
1114 | struct probe_arg *parg = &tk->tp.args[i]; | |
1115 | ||
1116 | ret = trace_define_field(event_call, parg->type->fmttype, | |
1117 | parg->name, | |
1118 | sizeof(field) + parg->offset, | |
1119 | parg->type->size, | |
1120 | parg->type->is_signed, | |
93ccae7a MH |
1121 | FILTER_OTHER); |
1122 | if (ret) | |
1123 | return ret; | |
1124 | } | |
413d37d1 MH |
1125 | return 0; |
1126 | } | |
1127 | ||
07b139c8 | 1128 | #ifdef CONFIG_PERF_EVENTS |
e08d1c65 MH |
1129 | |
1130 | /* Kprobe profile handler */ | |
3da0f180 | 1131 | static void |
c31ffb3f | 1132 | kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs) |
e08d1c65 | 1133 | { |
2425bcb9 | 1134 | struct trace_event_call *call = &tk->tp.call; |
2541517c | 1135 | struct bpf_prog *prog = call->prog; |
93ccae7a | 1136 | struct kprobe_trace_entry_head *entry; |
1c024eca | 1137 | struct hlist_head *head; |
e09c8614 | 1138 | int size, __size, dsize; |
4ed7c92d | 1139 | int rctx; |
e08d1c65 | 1140 | |
2541517c AS |
1141 | if (prog && !trace_call_bpf(prog, regs)) |
1142 | return; | |
1143 | ||
288e984e ON |
1144 | head = this_cpu_ptr(call->perf_events); |
1145 | if (hlist_empty(head)) | |
1146 | return; | |
1147 | ||
c31ffb3f NK |
1148 | dsize = __get_data_size(&tk->tp, regs); |
1149 | __size = sizeof(*entry) + tk->tp.size + dsize; | |
74ebb63e MH |
1150 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1151 | size -= sizeof(u32); | |
ce71b9df | 1152 | |
1e1dcd93 | 1153 | entry = perf_trace_buf_alloc(size, NULL, &rctx); |
430ad5a6 | 1154 | if (!entry) |
1e12a4a7 | 1155 | return; |
a1a138d0 | 1156 | |
c31ffb3f | 1157 | entry->ip = (unsigned long)tk->rp.kp.addr; |
e09c8614 | 1158 | memset(&entry[1], 0, dsize); |
c31ffb3f | 1159 | store_trace_args(sizeof(*entry), &tk->tp, regs, (u8 *)&entry[1], dsize); |
1e1dcd93 AS |
1160 | perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, |
1161 | head, NULL); | |
e08d1c65 | 1162 | } |
3da0f180 | 1163 | NOKPROBE_SYMBOL(kprobe_perf_func); |
e08d1c65 MH |
1164 | |
1165 | /* Kretprobe profile handler */ | |
3da0f180 | 1166 | static void |
c31ffb3f | 1167 | kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri, |
2b106aab | 1168 | struct pt_regs *regs) |
e08d1c65 | 1169 | { |
2425bcb9 | 1170 | struct trace_event_call *call = &tk->tp.call; |
2541517c | 1171 | struct bpf_prog *prog = call->prog; |
93ccae7a | 1172 | struct kretprobe_trace_entry_head *entry; |
1c024eca | 1173 | struct hlist_head *head; |
e09c8614 | 1174 | int size, __size, dsize; |
4ed7c92d | 1175 | int rctx; |
e08d1c65 | 1176 | |
2541517c AS |
1177 | if (prog && !trace_call_bpf(prog, regs)) |
1178 | return; | |
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 | |
1e1dcd93 | 1189 | entry = perf_trace_buf_alloc(size, NULL, &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); |
1e1dcd93 AS |
1196 | perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, |
1197 | head, NULL); | |
e08d1c65 | 1198 | } |
3da0f180 | 1199 | NOKPROBE_SYMBOL(kretprobe_perf_func); |
07b139c8 | 1200 | #endif /* CONFIG_PERF_EVENTS */ |
50d78056 | 1201 | |
3fe3d619 ON |
1202 | /* |
1203 | * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex. | |
1204 | * | |
1205 | * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe | |
1206 | * lockless, but we can't race with this __init function. | |
1207 | */ | |
2425bcb9 | 1208 | static int kprobe_register(struct trace_event_call *event, |
fbc1963d | 1209 | enum trace_reg type, void *data) |
2239291a | 1210 | { |
c31ffb3f | 1211 | struct trace_kprobe *tk = (struct trace_kprobe *)event->data; |
7f1d2f82 | 1212 | struct trace_event_file *file = data; |
1538f888 | 1213 | |
2239291a SR |
1214 | switch (type) { |
1215 | case TRACE_REG_REGISTER: | |
c31ffb3f | 1216 | return enable_trace_kprobe(tk, file); |
2239291a | 1217 | case TRACE_REG_UNREGISTER: |
c31ffb3f | 1218 | return disable_trace_kprobe(tk, file); |
2239291a SR |
1219 | |
1220 | #ifdef CONFIG_PERF_EVENTS | |
1221 | case TRACE_REG_PERF_REGISTER: | |
c31ffb3f | 1222 | return enable_trace_kprobe(tk, NULL); |
2239291a | 1223 | case TRACE_REG_PERF_UNREGISTER: |
c31ffb3f | 1224 | return disable_trace_kprobe(tk, NULL); |
ceec0b6f JO |
1225 | case TRACE_REG_PERF_OPEN: |
1226 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
1227 | case TRACE_REG_PERF_ADD: |
1228 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 1229 | return 0; |
2239291a SR |
1230 | #endif |
1231 | } | |
1232 | return 0; | |
1233 | } | |
50d78056 | 1234 | |
3da0f180 | 1235 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
50d78056 | 1236 | { |
c31ffb3f | 1237 | struct trace_kprobe *tk = container_of(kp, struct trace_kprobe, rp.kp); |
e08d1c65 | 1238 | |
a7636d9e | 1239 | raw_cpu_inc(*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 | } | |
3da0f180 | 1249 | NOKPROBE_SYMBOL(kprobe_dispatcher); |
50d78056 | 1250 | |
3da0f180 MH |
1251 | static int |
1252 | kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) | |
50d78056 | 1253 | { |
c31ffb3f | 1254 | struct trace_kprobe *tk = container_of(ri->rp, struct trace_kprobe, rp); |
50d78056 | 1255 | |
a7636d9e | 1256 | raw_cpu_inc(*tk->nhit); |
48182bd2 | 1257 | |
c31ffb3f NK |
1258 | if (tk->tp.flags & TP_FLAG_TRACE) |
1259 | kretprobe_trace_func(tk, ri, regs); | |
07b139c8 | 1260 | #ifdef CONFIG_PERF_EVENTS |
c31ffb3f NK |
1261 | if (tk->tp.flags & TP_FLAG_PROFILE) |
1262 | kretprobe_perf_func(tk, ri, regs); | |
07b139c8 | 1263 | #endif |
50d78056 MH |
1264 | return 0; /* We don't tweek kernel, so just return 0 */ |
1265 | } | |
3da0f180 | 1266 | NOKPROBE_SYMBOL(kretprobe_dispatcher); |
e08d1c65 | 1267 | |
a9a57763 SR |
1268 | static struct trace_event_functions kretprobe_funcs = { |
1269 | .trace = print_kretprobe_event | |
1270 | }; | |
1271 | ||
1272 | static struct trace_event_functions kprobe_funcs = { | |
1273 | .trace = print_kprobe_event | |
1274 | }; | |
1275 | ||
c31ffb3f | 1276 | static int register_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1277 | { |
2425bcb9 | 1278 | struct trace_event_call *call = &tk->tp.call; |
413d37d1 MH |
1279 | int ret; |
1280 | ||
2425bcb9 | 1281 | /* Initialize trace_event_call */ |
ffb9f995 | 1282 | INIT_LIST_HEAD(&call->class->fields); |
c31ffb3f | 1283 | if (trace_kprobe_is_return(tk)) { |
80decc70 | 1284 | call->event.funcs = &kretprobe_funcs; |
2e33af02 | 1285 | call->class->define_fields = kretprobe_event_define_fields; |
413d37d1 | 1286 | } else { |
80decc70 | 1287 | call->event.funcs = &kprobe_funcs; |
2e33af02 | 1288 | call->class->define_fields = kprobe_event_define_fields; |
413d37d1 | 1289 | } |
5bf652aa | 1290 | if (set_print_fmt(&tk->tp, trace_kprobe_is_return(tk)) < 0) |
a342a028 | 1291 | return -ENOMEM; |
9023c930 | 1292 | ret = register_trace_event(&call->event); |
32c0edae | 1293 | if (!ret) { |
a342a028 | 1294 | kfree(call->print_fmt); |
ff50d991 | 1295 | return -ENODEV; |
a342a028 | 1296 | } |
72cbbc89 | 1297 | call->flags = TRACE_EVENT_FL_KPROBE; |
2239291a | 1298 | call->class->reg = kprobe_register; |
c31ffb3f | 1299 | call->data = tk; |
413d37d1 | 1300 | ret = trace_add_event_call(call); |
ff50d991 | 1301 | if (ret) { |
de7b2973 | 1302 | pr_info("Failed to register kprobe event: %s\n", |
687fcc4a | 1303 | trace_event_name(call)); |
a342a028 | 1304 | kfree(call->print_fmt); |
9023c930 | 1305 | unregister_trace_event(&call->event); |
ff50d991 | 1306 | } |
413d37d1 MH |
1307 | return ret; |
1308 | } | |
1309 | ||
c31ffb3f | 1310 | static int unregister_kprobe_event(struct trace_kprobe *tk) |
413d37d1 | 1311 | { |
40c32592 SRRH |
1312 | int ret; |
1313 | ||
ff50d991 | 1314 | /* tp->event is unregistered in trace_remove_event_call() */ |
c31ffb3f | 1315 | ret = trace_remove_event_call(&tk->tp.call); |
40c32592 | 1316 | if (!ret) |
c31ffb3f | 1317 | kfree(tk->tp.call.print_fmt); |
40c32592 | 1318 | return ret; |
413d37d1 MH |
1319 | } |
1320 | ||
8434dc93 | 1321 | /* Make a tracefs interface for controlling probe points */ |
413d37d1 MH |
1322 | static __init int init_kprobe_trace(void) |
1323 | { | |
1324 | struct dentry *d_tracer; | |
1325 | struct dentry *entry; | |
413d37d1 | 1326 | |
c31ffb3f | 1327 | if (register_module_notifier(&trace_kprobe_module_nb)) |
61424318 MH |
1328 | return -EINVAL; |
1329 | ||
413d37d1 | 1330 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 1331 | if (IS_ERR(d_tracer)) |
413d37d1 MH |
1332 | return 0; |
1333 | ||
8434dc93 | 1334 | entry = tracefs_create_file("kprobe_events", 0644, d_tracer, |
413d37d1 MH |
1335 | NULL, &kprobe_events_ops); |
1336 | ||
cd7e7bd5 | 1337 | /* Event list interface */ |
413d37d1 | 1338 | if (!entry) |
a395d6a7 | 1339 | pr_warn("Could not create tracefs 'kprobe_events' entry\n"); |
cd7e7bd5 MH |
1340 | |
1341 | /* Profile interface */ | |
8434dc93 | 1342 | entry = tracefs_create_file("kprobe_profile", 0444, d_tracer, |
cd7e7bd5 MH |
1343 | NULL, &kprobe_profile_ops); |
1344 | ||
1345 | if (!entry) | |
a395d6a7 | 1346 | pr_warn("Could not create tracefs 'kprobe_profile' entry\n"); |
413d37d1 MH |
1347 | return 0; |
1348 | } | |
1349 | fs_initcall(init_kprobe_trace); | |
1350 | ||
1351 | ||
1352 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1353 | ||
265a5b7e SR |
1354 | /* |
1355 | * The "__used" keeps gcc from removing the function symbol | |
1356 | * from the kallsyms table. | |
1357 | */ | |
1358 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, | |
1359 | int a4, int a5, int a6) | |
413d37d1 MH |
1360 | { |
1361 | return a1 + a2 + a3 + a4 + a5 + a6; | |
1362 | } | |
1363 | ||
7f1d2f82 | 1364 | static struct trace_event_file * |
c31ffb3f | 1365 | find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr) |
41a7dd42 | 1366 | { |
7f1d2f82 | 1367 | struct trace_event_file *file; |
41a7dd42 MH |
1368 | |
1369 | list_for_each_entry(file, &tr->events, list) | |
c31ffb3f | 1370 | if (file->event_call == &tk->tp.call) |
41a7dd42 MH |
1371 | return file; |
1372 | ||
1373 | return NULL; | |
1374 | } | |
1375 | ||
3fe3d619 | 1376 | /* |
c31ffb3f | 1377 | * Nobody but us can call enable_trace_kprobe/disable_trace_kprobe at this |
3fe3d619 ON |
1378 | * stage, we can do this lockless. |
1379 | */ | |
413d37d1 MH |
1380 | static __init int kprobe_trace_self_tests_init(void) |
1381 | { | |
231e36f4 | 1382 | int ret, warn = 0; |
413d37d1 | 1383 | int (*target)(int, int, int, int, int, int); |
c31ffb3f | 1384 | struct trace_kprobe *tk; |
7f1d2f82 | 1385 | struct trace_event_file *file; |
413d37d1 | 1386 | |
748ec3a2 YY |
1387 | if (tracing_is_disabled()) |
1388 | return -ENODEV; | |
1389 | ||
413d37d1 MH |
1390 | target = kprobe_trace_selftest_target; |
1391 | ||
1392 | pr_info("Testing kprobe tracing: "); | |
1393 | ||
8ab83f56 SD |
1394 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
1395 | "$stack $stack0 +0($stack)", | |
c31ffb3f | 1396 | create_trace_kprobe); |
231e36f4 | 1397 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1398 | pr_warn("error on probing function entry.\n"); |
231e36f4 MH |
1399 | warn++; |
1400 | } else { | |
1401 | /* Enable trace point */ | |
c31ffb3f NK |
1402 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1403 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1404 | pr_warn("error on getting new probe.\n"); |
231e36f4 | 1405 | warn++; |
41a7dd42 | 1406 | } else { |
c31ffb3f | 1407 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1408 | if (WARN_ON_ONCE(file == NULL)) { |
1409 | pr_warn("error on getting probe file.\n"); | |
1410 | warn++; | |
1411 | } else | |
c31ffb3f | 1412 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1413 | } |
231e36f4 | 1414 | } |
413d37d1 | 1415 | |
8ab83f56 | 1416 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
c31ffb3f | 1417 | "$retval", create_trace_kprobe); |
231e36f4 | 1418 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1419 | pr_warn("error on probing function return.\n"); |
231e36f4 MH |
1420 | warn++; |
1421 | } else { | |
1422 | /* Enable trace point */ | |
c31ffb3f NK |
1423 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1424 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1425 | pr_warn("error on getting 2nd new probe.\n"); |
231e36f4 | 1426 | warn++; |
41a7dd42 | 1427 | } else { |
c31ffb3f | 1428 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1429 | if (WARN_ON_ONCE(file == NULL)) { |
1430 | pr_warn("error on getting probe file.\n"); | |
1431 | warn++; | |
1432 | } else | |
c31ffb3f | 1433 | enable_trace_kprobe(tk, file); |
41a7dd42 | 1434 | } |
231e36f4 MH |
1435 | } |
1436 | ||
1437 | if (warn) | |
1438 | goto end; | |
413d37d1 MH |
1439 | |
1440 | ret = target(1, 2, 3, 4, 5, 6); | |
1441 | ||
02ca1521 | 1442 | /* Disable trace points before removing it */ |
c31ffb3f NK |
1443 | tk = find_trace_kprobe("testprobe", KPROBE_EVENT_SYSTEM); |
1444 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1445 | pr_warn("error on getting test probe.\n"); |
02ca1521 | 1446 | warn++; |
41a7dd42 | 1447 | } else { |
c31ffb3f | 1448 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1449 | if (WARN_ON_ONCE(file == NULL)) { |
1450 | pr_warn("error on getting probe file.\n"); | |
1451 | warn++; | |
1452 | } else | |
c31ffb3f | 1453 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1454 | } |
02ca1521 | 1455 | |
c31ffb3f NK |
1456 | tk = find_trace_kprobe("testprobe2", KPROBE_EVENT_SYSTEM); |
1457 | if (WARN_ON_ONCE(tk == NULL)) { | |
41a7dd42 | 1458 | pr_warn("error on getting 2nd test probe.\n"); |
02ca1521 | 1459 | warn++; |
41a7dd42 | 1460 | } else { |
c31ffb3f | 1461 | file = find_trace_probe_file(tk, top_trace_array()); |
41a7dd42 MH |
1462 | if (WARN_ON_ONCE(file == NULL)) { |
1463 | pr_warn("error on getting probe file.\n"); | |
1464 | warn++; | |
1465 | } else | |
c31ffb3f | 1466 | disable_trace_kprobe(tk, file); |
41a7dd42 | 1467 | } |
02ca1521 | 1468 | |
c31ffb3f | 1469 | ret = traceprobe_command("-:testprobe", create_trace_kprobe); |
231e36f4 | 1470 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1471 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1472 | warn++; |
1473 | } | |
1474 | ||
c31ffb3f | 1475 | ret = traceprobe_command("-:testprobe2", create_trace_kprobe); |
231e36f4 | 1476 | if (WARN_ON_ONCE(ret)) { |
41a7dd42 | 1477 | pr_warn("error on deleting a probe.\n"); |
231e36f4 MH |
1478 | warn++; |
1479 | } | |
413d37d1 | 1480 | |
231e36f4 | 1481 | end: |
c31ffb3f | 1482 | release_all_trace_kprobes(); |
231e36f4 MH |
1483 | if (warn) |
1484 | pr_cont("NG: Some tests are failed. Please check them.\n"); | |
1485 | else | |
1486 | pr_cont("OK\n"); | |
413d37d1 MH |
1487 | return 0; |
1488 | } | |
1489 | ||
1490 | late_initcall(kprobe_trace_self_tests_init); | |
1491 | ||
1492 | #endif |