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Commit | Line | Data |
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f3f096cf SD |
1 | /* |
2 | * uprobes-based tracing events | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | * | |
17 | * Copyright (C) IBM Corporation, 2010-2012 | |
18 | * Author: Srikar Dronamraju <srikar@linux.vnet.ibm.com> | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/uprobes.h> | |
24 | #include <linux/namei.h> | |
b2e902f0 | 25 | #include <linux/string.h> |
f3f096cf SD |
26 | |
27 | #include "trace_probe.h" | |
28 | ||
29 | #define UPROBE_EVENT_SYSTEM "uprobes" | |
30 | ||
457d1772 ON |
31 | struct uprobe_trace_entry_head { |
32 | struct trace_entry ent; | |
33 | unsigned long vaddr[]; | |
34 | }; | |
35 | ||
36 | #define SIZEOF_TRACE_ENTRY(is_return) \ | |
37 | (sizeof(struct uprobe_trace_entry_head) + \ | |
38 | sizeof(unsigned long) * (is_return ? 2 : 1)) | |
39 | ||
40 | #define DATAOF_TRACE_ENTRY(entry, is_return) \ | |
41 | ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return)) | |
42 | ||
736288ba ON |
43 | struct trace_uprobe_filter { |
44 | rwlock_t rwlock; | |
45 | int nr_systemwide; | |
46 | struct list_head perf_events; | |
47 | }; | |
48 | ||
f3f096cf SD |
49 | /* |
50 | * uprobe event core functions | |
51 | */ | |
f3f096cf SD |
52 | struct trace_uprobe { |
53 | struct list_head list; | |
736288ba | 54 | struct trace_uprobe_filter filter; |
a932b738 | 55 | struct uprobe_consumer consumer; |
f3f096cf SD |
56 | struct inode *inode; |
57 | char *filename; | |
58 | unsigned long offset; | |
59 | unsigned long nhit; | |
14577c39 | 60 | struct trace_probe tp; |
f3f096cf SD |
61 | }; |
62 | ||
14577c39 NK |
63 | #define SIZEOF_TRACE_UPROBE(n) \ |
64 | (offsetof(struct trace_uprobe, tp.args) + \ | |
f3f096cf SD |
65 | (sizeof(struct probe_arg) * (n))) |
66 | ||
67 | static int register_uprobe_event(struct trace_uprobe *tu); | |
c6c2401d | 68 | static int unregister_uprobe_event(struct trace_uprobe *tu); |
f3f096cf SD |
69 | |
70 | static DEFINE_MUTEX(uprobe_lock); | |
71 | static LIST_HEAD(uprobe_list); | |
72 | ||
73 | static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs); | |
c1ae5c75 ON |
74 | static int uretprobe_dispatcher(struct uprobe_consumer *con, |
75 | unsigned long func, struct pt_regs *regs); | |
f3f096cf | 76 | |
3fd996a2 NK |
77 | #ifdef CONFIG_STACK_GROWSUP |
78 | static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) | |
79 | { | |
80 | return addr - (n * sizeof(long)); | |
81 | } | |
82 | #else | |
83 | static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) | |
84 | { | |
85 | return addr + (n * sizeof(long)); | |
86 | } | |
87 | #endif | |
88 | ||
89 | static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n) | |
90 | { | |
91 | unsigned long ret; | |
92 | unsigned long addr = user_stack_pointer(regs); | |
93 | ||
94 | addr = adjust_stack_addr(addr, n); | |
95 | ||
96 | if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret))) | |
97 | return 0; | |
98 | ||
99 | return ret; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Uprobes-specific fetch functions | |
104 | */ | |
105 | #define DEFINE_FETCH_stack(type) \ | |
106 | static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\ | |
107 | void *offset, void *dest) \ | |
108 | { \ | |
109 | *(type *)dest = (type)get_user_stack_nth(regs, \ | |
110 | ((unsigned long)offset)); \ | |
111 | } | |
112 | DEFINE_BASIC_FETCH_FUNCS(stack) | |
113 | /* No string on the stack entry */ | |
114 | #define fetch_stack_string NULL | |
115 | #define fetch_stack_string_size NULL | |
116 | ||
5baaa59e NK |
117 | #define DEFINE_FETCH_memory(type) \ |
118 | static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\ | |
119 | void *addr, void *dest) \ | |
120 | { \ | |
121 | type retval; \ | |
122 | void __user *vaddr = (void __force __user *) addr; \ | |
123 | \ | |
124 | if (copy_from_user(&retval, vaddr, sizeof(type))) \ | |
125 | *(type *)dest = 0; \ | |
126 | else \ | |
127 | *(type *) dest = retval; \ | |
128 | } | |
129 | DEFINE_BASIC_FETCH_FUNCS(memory) | |
130 | /* | |
131 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
132 | * length and relative data location. | |
133 | */ | |
134 | static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, | |
135 | void *addr, void *dest) | |
136 | { | |
137 | long ret; | |
138 | u32 rloc = *(u32 *)dest; | |
139 | int maxlen = get_rloc_len(rloc); | |
140 | u8 *dst = get_rloc_data(dest); | |
141 | void __user *src = (void __force __user *) addr; | |
142 | ||
143 | if (!maxlen) | |
144 | return; | |
145 | ||
146 | ret = strncpy_from_user(dst, src, maxlen); | |
147 | ||
148 | if (ret < 0) { /* Failed to fetch string */ | |
149 | ((u8 *)get_rloc_data(dest))[0] = '\0'; | |
150 | *(u32 *)dest = make_data_rloc(0, get_rloc_offs(rloc)); | |
151 | } else { | |
152 | *(u32 *)dest = make_data_rloc(ret, get_rloc_offs(rloc)); | |
153 | } | |
154 | } | |
155 | ||
156 | static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, | |
157 | void *addr, void *dest) | |
158 | { | |
159 | int len; | |
160 | void __user *vaddr = (void __force __user *) addr; | |
161 | ||
162 | len = strnlen_user(vaddr, MAX_STRING_SIZE); | |
163 | ||
164 | if (len == 0 || len > MAX_STRING_SIZE) /* Failed to check length */ | |
165 | *(u32 *)dest = 0; | |
166 | else | |
167 | *(u32 *)dest = len; | |
168 | } | |
3fd996a2 | 169 | |
1301a44e NK |
170 | /* uprobes do not support symbol fetch methods */ |
171 | #define fetch_symbol_u8 NULL | |
172 | #define fetch_symbol_u16 NULL | |
173 | #define fetch_symbol_u32 NULL | |
174 | #define fetch_symbol_u64 NULL | |
175 | #define fetch_symbol_string NULL | |
176 | #define fetch_symbol_string_size NULL | |
177 | ||
34fee3a1 NK |
178 | /* Fetch type information table */ |
179 | const struct fetch_type uprobes_fetch_type_table[] = { | |
180 | /* Special types */ | |
181 | [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, | |
182 | sizeof(u32), 1, "__data_loc char[]"), | |
183 | [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, | |
184 | string_size, sizeof(u32), 0, "u32"), | |
185 | /* Basic types */ | |
186 | ASSIGN_FETCH_TYPE(u8, u8, 0), | |
187 | ASSIGN_FETCH_TYPE(u16, u16, 0), | |
188 | ASSIGN_FETCH_TYPE(u32, u32, 0), | |
189 | ASSIGN_FETCH_TYPE(u64, u64, 0), | |
190 | ASSIGN_FETCH_TYPE(s8, u8, 1), | |
191 | ASSIGN_FETCH_TYPE(s16, u16, 1), | |
192 | ASSIGN_FETCH_TYPE(s32, u32, 1), | |
193 | ASSIGN_FETCH_TYPE(s64, u64, 1), | |
194 | ||
195 | ASSIGN_FETCH_TYPE_END | |
196 | }; | |
197 | ||
736288ba ON |
198 | static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter) |
199 | { | |
200 | rwlock_init(&filter->rwlock); | |
201 | filter->nr_systemwide = 0; | |
202 | INIT_LIST_HEAD(&filter->perf_events); | |
203 | } | |
204 | ||
205 | static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter) | |
206 | { | |
207 | return !filter->nr_systemwide && list_empty(&filter->perf_events); | |
208 | } | |
209 | ||
c1ae5c75 ON |
210 | static inline bool is_ret_probe(struct trace_uprobe *tu) |
211 | { | |
212 | return tu->consumer.ret_handler != NULL; | |
213 | } | |
214 | ||
f3f096cf SD |
215 | /* |
216 | * Allocate new trace_uprobe and initialize it (including uprobes). | |
217 | */ | |
218 | static struct trace_uprobe * | |
c1ae5c75 | 219 | alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret) |
f3f096cf SD |
220 | { |
221 | struct trace_uprobe *tu; | |
222 | ||
223 | if (!event || !is_good_name(event)) | |
224 | return ERR_PTR(-EINVAL); | |
225 | ||
226 | if (!group || !is_good_name(group)) | |
227 | return ERR_PTR(-EINVAL); | |
228 | ||
229 | tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL); | |
230 | if (!tu) | |
231 | return ERR_PTR(-ENOMEM); | |
232 | ||
14577c39 NK |
233 | tu->tp.call.class = &tu->tp.class; |
234 | tu->tp.call.name = kstrdup(event, GFP_KERNEL); | |
235 | if (!tu->tp.call.name) | |
f3f096cf SD |
236 | goto error; |
237 | ||
14577c39 NK |
238 | tu->tp.class.system = kstrdup(group, GFP_KERNEL); |
239 | if (!tu->tp.class.system) | |
f3f096cf SD |
240 | goto error; |
241 | ||
242 | INIT_LIST_HEAD(&tu->list); | |
a932b738 | 243 | tu->consumer.handler = uprobe_dispatcher; |
c1ae5c75 ON |
244 | if (is_ret) |
245 | tu->consumer.ret_handler = uretprobe_dispatcher; | |
736288ba | 246 | init_trace_uprobe_filter(&tu->filter); |
14577c39 | 247 | tu->tp.call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER; |
f3f096cf SD |
248 | return tu; |
249 | ||
250 | error: | |
14577c39 | 251 | kfree(tu->tp.call.name); |
f3f096cf SD |
252 | kfree(tu); |
253 | ||
254 | return ERR_PTR(-ENOMEM); | |
255 | } | |
256 | ||
257 | static void free_trace_uprobe(struct trace_uprobe *tu) | |
258 | { | |
259 | int i; | |
260 | ||
14577c39 NK |
261 | for (i = 0; i < tu->tp.nr_args; i++) |
262 | traceprobe_free_probe_arg(&tu->tp.args[i]); | |
f3f096cf SD |
263 | |
264 | iput(tu->inode); | |
14577c39 NK |
265 | kfree(tu->tp.call.class->system); |
266 | kfree(tu->tp.call.name); | |
f3f096cf SD |
267 | kfree(tu->filename); |
268 | kfree(tu); | |
269 | } | |
270 | ||
271 | static struct trace_uprobe *find_probe_event(const char *event, const char *group) | |
272 | { | |
273 | struct trace_uprobe *tu; | |
274 | ||
275 | list_for_each_entry(tu, &uprobe_list, list) | |
14577c39 NK |
276 | if (strcmp(tu->tp.call.name, event) == 0 && |
277 | strcmp(tu->tp.call.class->system, group) == 0) | |
f3f096cf SD |
278 | return tu; |
279 | ||
280 | return NULL; | |
281 | } | |
282 | ||
283 | /* Unregister a trace_uprobe and probe_event: call with locking uprobe_lock */ | |
c6c2401d | 284 | static int unregister_trace_uprobe(struct trace_uprobe *tu) |
f3f096cf | 285 | { |
c6c2401d SRRH |
286 | int ret; |
287 | ||
288 | ret = unregister_uprobe_event(tu); | |
289 | if (ret) | |
290 | return ret; | |
291 | ||
f3f096cf | 292 | list_del(&tu->list); |
f3f096cf | 293 | free_trace_uprobe(tu); |
c6c2401d | 294 | return 0; |
f3f096cf SD |
295 | } |
296 | ||
297 | /* Register a trace_uprobe and probe_event */ | |
298 | static int register_trace_uprobe(struct trace_uprobe *tu) | |
299 | { | |
14577c39 | 300 | struct trace_uprobe *old_tu; |
f3f096cf SD |
301 | int ret; |
302 | ||
303 | mutex_lock(&uprobe_lock); | |
304 | ||
305 | /* register as an event */ | |
14577c39 NK |
306 | old_tu = find_probe_event(tu->tp.call.name, tu->tp.call.class->system); |
307 | if (old_tu) { | |
f3f096cf | 308 | /* delete old event */ |
14577c39 | 309 | ret = unregister_trace_uprobe(old_tu); |
c6c2401d SRRH |
310 | if (ret) |
311 | goto end; | |
312 | } | |
f3f096cf SD |
313 | |
314 | ret = register_uprobe_event(tu); | |
315 | if (ret) { | |
316 | pr_warning("Failed to register probe event(%d)\n", ret); | |
317 | goto end; | |
318 | } | |
319 | ||
320 | list_add_tail(&tu->list, &uprobe_list); | |
321 | ||
322 | end: | |
323 | mutex_unlock(&uprobe_lock); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Argument syntax: | |
306cfe20 | 330 | * - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] |
f3f096cf SD |
331 | * |
332 | * - Remove uprobe: -:[GRP/]EVENT | |
333 | */ | |
334 | static int create_trace_uprobe(int argc, char **argv) | |
335 | { | |
336 | struct trace_uprobe *tu; | |
337 | struct inode *inode; | |
338 | char *arg, *event, *group, *filename; | |
339 | char buf[MAX_EVENT_NAME_LEN]; | |
340 | struct path path; | |
341 | unsigned long offset; | |
4ee5a52e | 342 | bool is_delete, is_return; |
f3f096cf SD |
343 | int i, ret; |
344 | ||
345 | inode = NULL; | |
346 | ret = 0; | |
347 | is_delete = false; | |
4ee5a52e | 348 | is_return = false; |
f3f096cf SD |
349 | event = NULL; |
350 | group = NULL; | |
351 | ||
352 | /* argc must be >= 1 */ | |
353 | if (argv[0][0] == '-') | |
354 | is_delete = true; | |
4ee5a52e ON |
355 | else if (argv[0][0] == 'r') |
356 | is_return = true; | |
f3f096cf | 357 | else if (argv[0][0] != 'p') { |
4ee5a52e | 358 | pr_info("Probe definition must be started with 'p', 'r' or '-'.\n"); |
f3f096cf SD |
359 | return -EINVAL; |
360 | } | |
361 | ||
362 | if (argv[0][1] == ':') { | |
363 | event = &argv[0][2]; | |
364 | arg = strchr(event, '/'); | |
365 | ||
366 | if (arg) { | |
367 | group = event; | |
368 | event = arg + 1; | |
369 | event[-1] = '\0'; | |
370 | ||
371 | if (strlen(group) == 0) { | |
372 | pr_info("Group name is not specified\n"); | |
373 | return -EINVAL; | |
374 | } | |
375 | } | |
376 | if (strlen(event) == 0) { | |
377 | pr_info("Event name is not specified\n"); | |
378 | return -EINVAL; | |
379 | } | |
380 | } | |
381 | if (!group) | |
382 | group = UPROBE_EVENT_SYSTEM; | |
383 | ||
384 | if (is_delete) { | |
c6c2401d SRRH |
385 | int ret; |
386 | ||
f3f096cf SD |
387 | if (!event) { |
388 | pr_info("Delete command needs an event name.\n"); | |
389 | return -EINVAL; | |
390 | } | |
391 | mutex_lock(&uprobe_lock); | |
392 | tu = find_probe_event(event, group); | |
393 | ||
394 | if (!tu) { | |
395 | mutex_unlock(&uprobe_lock); | |
396 | pr_info("Event %s/%s doesn't exist.\n", group, event); | |
397 | return -ENOENT; | |
398 | } | |
399 | /* delete an event */ | |
c6c2401d | 400 | ret = unregister_trace_uprobe(tu); |
f3f096cf | 401 | mutex_unlock(&uprobe_lock); |
c6c2401d | 402 | return ret; |
f3f096cf SD |
403 | } |
404 | ||
405 | if (argc < 2) { | |
406 | pr_info("Probe point is not specified.\n"); | |
407 | return -EINVAL; | |
408 | } | |
409 | if (isdigit(argv[1][0])) { | |
410 | pr_info("probe point must be have a filename.\n"); | |
411 | return -EINVAL; | |
412 | } | |
413 | arg = strchr(argv[1], ':'); | |
fa44063f J |
414 | if (!arg) { |
415 | ret = -EINVAL; | |
f3f096cf | 416 | goto fail_address_parse; |
fa44063f | 417 | } |
f3f096cf SD |
418 | |
419 | *arg++ = '\0'; | |
420 | filename = argv[1]; | |
421 | ret = kern_path(filename, LOOKUP_FOLLOW, &path); | |
422 | if (ret) | |
423 | goto fail_address_parse; | |
424 | ||
f3f096cf | 425 | inode = igrab(path.dentry->d_inode); |
84d7ed79 ON |
426 | path_put(&path); |
427 | ||
7e4e28c5 | 428 | if (!inode || !S_ISREG(inode->i_mode)) { |
d24d7dbf JZ |
429 | ret = -EINVAL; |
430 | goto fail_address_parse; | |
431 | } | |
f3f096cf | 432 | |
84d7ed79 ON |
433 | ret = kstrtoul(arg, 0, &offset); |
434 | if (ret) | |
435 | goto fail_address_parse; | |
436 | ||
f3f096cf SD |
437 | argc -= 2; |
438 | argv += 2; | |
439 | ||
440 | /* setup a probe */ | |
441 | if (!event) { | |
b2e902f0 | 442 | char *tail; |
f3f096cf SD |
443 | char *ptr; |
444 | ||
b2e902f0 AS |
445 | tail = kstrdup(kbasename(filename), GFP_KERNEL); |
446 | if (!tail) { | |
f3f096cf SD |
447 | ret = -ENOMEM; |
448 | goto fail_address_parse; | |
449 | } | |
450 | ||
f3f096cf SD |
451 | ptr = strpbrk(tail, ".-_"); |
452 | if (ptr) | |
453 | *ptr = '\0'; | |
454 | ||
455 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset); | |
456 | event = buf; | |
457 | kfree(tail); | |
458 | } | |
459 | ||
4ee5a52e | 460 | tu = alloc_trace_uprobe(group, event, argc, is_return); |
f3f096cf SD |
461 | if (IS_ERR(tu)) { |
462 | pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu)); | |
463 | ret = PTR_ERR(tu); | |
464 | goto fail_address_parse; | |
465 | } | |
466 | tu->offset = offset; | |
467 | tu->inode = inode; | |
468 | tu->filename = kstrdup(filename, GFP_KERNEL); | |
469 | ||
470 | if (!tu->filename) { | |
471 | pr_info("Failed to allocate filename.\n"); | |
472 | ret = -ENOMEM; | |
473 | goto error; | |
474 | } | |
475 | ||
476 | /* parse arguments */ | |
477 | ret = 0; | |
478 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { | |
14577c39 NK |
479 | struct probe_arg *parg = &tu->tp.args[i]; |
480 | ||
f3f096cf | 481 | /* Increment count for freeing args in error case */ |
14577c39 | 482 | tu->tp.nr_args++; |
f3f096cf SD |
483 | |
484 | /* Parse argument name */ | |
485 | arg = strchr(argv[i], '='); | |
486 | if (arg) { | |
487 | *arg++ = '\0'; | |
14577c39 | 488 | parg->name = kstrdup(argv[i], GFP_KERNEL); |
f3f096cf SD |
489 | } else { |
490 | arg = argv[i]; | |
491 | /* If argument name is omitted, set "argN" */ | |
492 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); | |
14577c39 | 493 | parg->name = kstrdup(buf, GFP_KERNEL); |
f3f096cf SD |
494 | } |
495 | ||
14577c39 | 496 | if (!parg->name) { |
f3f096cf SD |
497 | pr_info("Failed to allocate argument[%d] name.\n", i); |
498 | ret = -ENOMEM; | |
499 | goto error; | |
500 | } | |
501 | ||
14577c39 NK |
502 | if (!is_good_name(parg->name)) { |
503 | pr_info("Invalid argument[%d] name: %s\n", i, parg->name); | |
f3f096cf SD |
504 | ret = -EINVAL; |
505 | goto error; | |
506 | } | |
507 | ||
14577c39 | 508 | if (traceprobe_conflict_field_name(parg->name, tu->tp.args, i)) { |
f3f096cf SD |
509 | pr_info("Argument[%d] name '%s' conflicts with " |
510 | "another field.\n", i, argv[i]); | |
511 | ret = -EINVAL; | |
512 | goto error; | |
513 | } | |
514 | ||
515 | /* Parse fetch argument */ | |
14577c39 | 516 | ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg, |
a4734145 | 517 | is_return, false); |
f3f096cf SD |
518 | if (ret) { |
519 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); | |
520 | goto error; | |
521 | } | |
522 | } | |
523 | ||
524 | ret = register_trace_uprobe(tu); | |
525 | if (ret) | |
526 | goto error; | |
527 | return 0; | |
528 | ||
529 | error: | |
530 | free_trace_uprobe(tu); | |
531 | return ret; | |
532 | ||
533 | fail_address_parse: | |
534 | if (inode) | |
535 | iput(inode); | |
536 | ||
d24d7dbf | 537 | pr_info("Failed to parse address or file.\n"); |
f3f096cf SD |
538 | |
539 | return ret; | |
540 | } | |
541 | ||
c6c2401d | 542 | static int cleanup_all_probes(void) |
f3f096cf SD |
543 | { |
544 | struct trace_uprobe *tu; | |
c6c2401d | 545 | int ret = 0; |
f3f096cf SD |
546 | |
547 | mutex_lock(&uprobe_lock); | |
548 | while (!list_empty(&uprobe_list)) { | |
549 | tu = list_entry(uprobe_list.next, struct trace_uprobe, list); | |
c6c2401d SRRH |
550 | ret = unregister_trace_uprobe(tu); |
551 | if (ret) | |
552 | break; | |
f3f096cf SD |
553 | } |
554 | mutex_unlock(&uprobe_lock); | |
c6c2401d | 555 | return ret; |
f3f096cf SD |
556 | } |
557 | ||
558 | /* Probes listing interfaces */ | |
559 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) | |
560 | { | |
561 | mutex_lock(&uprobe_lock); | |
562 | return seq_list_start(&uprobe_list, *pos); | |
563 | } | |
564 | ||
565 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
566 | { | |
567 | return seq_list_next(v, &uprobe_list, pos); | |
568 | } | |
569 | ||
570 | static void probes_seq_stop(struct seq_file *m, void *v) | |
571 | { | |
572 | mutex_unlock(&uprobe_lock); | |
573 | } | |
574 | ||
575 | static int probes_seq_show(struct seq_file *m, void *v) | |
576 | { | |
577 | struct trace_uprobe *tu = v; | |
3ede82dd | 578 | char c = is_ret_probe(tu) ? 'r' : 'p'; |
f3f096cf SD |
579 | int i; |
580 | ||
14577c39 | 581 | seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system, tu->tp.call.name); |
f3f096cf SD |
582 | seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset); |
583 | ||
14577c39 NK |
584 | for (i = 0; i < tu->tp.nr_args; i++) |
585 | seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm); | |
f3f096cf SD |
586 | |
587 | seq_printf(m, "\n"); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static const struct seq_operations probes_seq_op = { | |
592 | .start = probes_seq_start, | |
593 | .next = probes_seq_next, | |
594 | .stop = probes_seq_stop, | |
595 | .show = probes_seq_show | |
596 | }; | |
597 | ||
598 | static int probes_open(struct inode *inode, struct file *file) | |
599 | { | |
c6c2401d SRRH |
600 | int ret; |
601 | ||
602 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { | |
603 | ret = cleanup_all_probes(); | |
604 | if (ret) | |
605 | return ret; | |
606 | } | |
f3f096cf SD |
607 | |
608 | return seq_open(file, &probes_seq_op); | |
609 | } | |
610 | ||
611 | static ssize_t probes_write(struct file *file, const char __user *buffer, | |
612 | size_t count, loff_t *ppos) | |
613 | { | |
614 | return traceprobe_probes_write(file, buffer, count, ppos, create_trace_uprobe); | |
615 | } | |
616 | ||
617 | static const struct file_operations uprobe_events_ops = { | |
618 | .owner = THIS_MODULE, | |
619 | .open = probes_open, | |
620 | .read = seq_read, | |
621 | .llseek = seq_lseek, | |
622 | .release = seq_release, | |
623 | .write = probes_write, | |
624 | }; | |
625 | ||
626 | /* Probes profiling interfaces */ | |
627 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
628 | { | |
629 | struct trace_uprobe *tu = v; | |
630 | ||
14577c39 | 631 | seq_printf(m, " %s %-44s %15lu\n", tu->filename, tu->tp.call.name, tu->nhit); |
f3f096cf SD |
632 | return 0; |
633 | } | |
634 | ||
635 | static const struct seq_operations profile_seq_op = { | |
636 | .start = probes_seq_start, | |
637 | .next = probes_seq_next, | |
638 | .stop = probes_seq_stop, | |
639 | .show = probes_profile_seq_show | |
640 | }; | |
641 | ||
642 | static int profile_open(struct inode *inode, struct file *file) | |
643 | { | |
644 | return seq_open(file, &profile_seq_op); | |
645 | } | |
646 | ||
647 | static const struct file_operations uprobe_profile_ops = { | |
648 | .owner = THIS_MODULE, | |
649 | .open = profile_open, | |
650 | .read = seq_read, | |
651 | .llseek = seq_lseek, | |
652 | .release = seq_release, | |
653 | }; | |
654 | ||
dcad1a20 NK |
655 | struct uprobe_cpu_buffer { |
656 | struct mutex mutex; | |
657 | void *buf; | |
658 | }; | |
659 | static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer; | |
660 | static int uprobe_buffer_refcnt; | |
661 | ||
662 | static int uprobe_buffer_init(void) | |
663 | { | |
664 | int cpu, err_cpu; | |
665 | ||
666 | uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer); | |
667 | if (uprobe_cpu_buffer == NULL) | |
668 | return -ENOMEM; | |
669 | ||
670 | for_each_possible_cpu(cpu) { | |
671 | struct page *p = alloc_pages_node(cpu_to_node(cpu), | |
672 | GFP_KERNEL, 0); | |
673 | if (p == NULL) { | |
674 | err_cpu = cpu; | |
675 | goto err; | |
676 | } | |
677 | per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p); | |
678 | mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex); | |
679 | } | |
680 | ||
681 | return 0; | |
682 | ||
683 | err: | |
684 | for_each_possible_cpu(cpu) { | |
685 | if (cpu == err_cpu) | |
686 | break; | |
687 | free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf); | |
688 | } | |
689 | ||
690 | free_percpu(uprobe_cpu_buffer); | |
691 | return -ENOMEM; | |
692 | } | |
693 | ||
694 | static int uprobe_buffer_enable(void) | |
695 | { | |
696 | int ret = 0; | |
697 | ||
698 | BUG_ON(!mutex_is_locked(&event_mutex)); | |
699 | ||
700 | if (uprobe_buffer_refcnt++ == 0) { | |
701 | ret = uprobe_buffer_init(); | |
702 | if (ret < 0) | |
703 | uprobe_buffer_refcnt--; | |
704 | } | |
705 | ||
706 | return ret; | |
707 | } | |
708 | ||
709 | static void uprobe_buffer_disable(void) | |
710 | { | |
711 | BUG_ON(!mutex_is_locked(&event_mutex)); | |
712 | ||
713 | if (--uprobe_buffer_refcnt == 0) { | |
714 | free_percpu(uprobe_cpu_buffer); | |
715 | uprobe_cpu_buffer = NULL; | |
716 | } | |
717 | } | |
718 | ||
719 | static struct uprobe_cpu_buffer *uprobe_buffer_get(void) | |
720 | { | |
721 | struct uprobe_cpu_buffer *ucb; | |
722 | int cpu; | |
723 | ||
724 | cpu = raw_smp_processor_id(); | |
725 | ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu); | |
726 | ||
727 | /* | |
728 | * Use per-cpu buffers for fastest access, but we might migrate | |
729 | * so the mutex makes sure we have sole access to it. | |
730 | */ | |
731 | mutex_lock(&ucb->mutex); | |
732 | ||
733 | return ucb; | |
734 | } | |
735 | ||
736 | static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb) | |
737 | { | |
738 | mutex_unlock(&ucb->mutex); | |
739 | } | |
740 | ||
a51cc604 ON |
741 | static void uprobe_trace_print(struct trace_uprobe *tu, |
742 | unsigned long func, struct pt_regs *regs) | |
f3f096cf SD |
743 | { |
744 | struct uprobe_trace_entry_head *entry; | |
745 | struct ring_buffer_event *event; | |
746 | struct ring_buffer *buffer; | |
dcad1a20 | 747 | struct uprobe_cpu_buffer *ucb; |
457d1772 | 748 | void *data; |
dcad1a20 | 749 | int size, dsize, esize; |
14577c39 | 750 | struct ftrace_event_call *call = &tu->tp.call; |
f3f096cf | 751 | |
dcad1a20 NK |
752 | dsize = __get_data_size(&tu->tp, regs); |
753 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); | |
754 | ||
755 | if (WARN_ON_ONCE(!uprobe_cpu_buffer || tu->tp.size + dsize > PAGE_SIZE)) | |
756 | return; | |
757 | ||
758 | ucb = uprobe_buffer_get(); | |
759 | store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize); | |
760 | ||
761 | size = esize + tu->tp.size + dsize; | |
f3f096cf | 762 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
dcad1a20 | 763 | size, 0, 0); |
f3f096cf | 764 | if (!event) |
dcad1a20 | 765 | goto out; |
f3f096cf SD |
766 | |
767 | entry = ring_buffer_event_data(event); | |
393a736c ON |
768 | if (is_ret_probe(tu)) { |
769 | entry->vaddr[0] = func; | |
770 | entry->vaddr[1] = instruction_pointer(regs); | |
771 | data = DATAOF_TRACE_ENTRY(entry, true); | |
772 | } else { | |
773 | entry->vaddr[0] = instruction_pointer(regs); | |
774 | data = DATAOF_TRACE_ENTRY(entry, false); | |
775 | } | |
776 | ||
dcad1a20 | 777 | memcpy(data, ucb->buf, tu->tp.size + dsize); |
f3f096cf | 778 | |
f306cc82 | 779 | if (!call_filter_check_discard(call, entry, buffer, event)) |
0e3853d2 | 780 | trace_buffer_unlock_commit(buffer, event, 0, 0); |
dcad1a20 NK |
781 | |
782 | out: | |
783 | uprobe_buffer_put(ucb); | |
a51cc604 | 784 | } |
f42d24a1 | 785 | |
a51cc604 ON |
786 | /* uprobe handler */ |
787 | static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs) | |
788 | { | |
393a736c ON |
789 | if (!is_ret_probe(tu)) |
790 | uprobe_trace_print(tu, 0, regs); | |
f42d24a1 | 791 | return 0; |
f3f096cf SD |
792 | } |
793 | ||
c1ae5c75 ON |
794 | static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func, |
795 | struct pt_regs *regs) | |
796 | { | |
797 | uprobe_trace_print(tu, func, regs); | |
798 | } | |
799 | ||
f3f096cf SD |
800 | /* Event entry printers */ |
801 | static enum print_line_t | |
802 | print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event) | |
803 | { | |
457d1772 | 804 | struct uprobe_trace_entry_head *entry; |
f3f096cf SD |
805 | struct trace_seq *s = &iter->seq; |
806 | struct trace_uprobe *tu; | |
807 | u8 *data; | |
808 | int i; | |
809 | ||
457d1772 | 810 | entry = (struct uprobe_trace_entry_head *)iter->ent; |
14577c39 | 811 | tu = container_of(event, struct trace_uprobe, tp.call.event); |
f3f096cf | 812 | |
3ede82dd | 813 | if (is_ret_probe(tu)) { |
14577c39 | 814 | if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->tp.call.name, |
3ede82dd ON |
815 | entry->vaddr[1], entry->vaddr[0])) |
816 | goto partial; | |
817 | data = DATAOF_TRACE_ENTRY(entry, true); | |
818 | } else { | |
14577c39 | 819 | if (!trace_seq_printf(s, "%s: (0x%lx)", tu->tp.call.name, |
3ede82dd ON |
820 | entry->vaddr[0])) |
821 | goto partial; | |
822 | data = DATAOF_TRACE_ENTRY(entry, false); | |
823 | } | |
f3f096cf | 824 | |
14577c39 NK |
825 | for (i = 0; i < tu->tp.nr_args; i++) { |
826 | struct probe_arg *parg = &tu->tp.args[i]; | |
827 | ||
828 | if (!parg->type->print(s, parg->name, data + parg->offset, entry)) | |
f3f096cf SD |
829 | goto partial; |
830 | } | |
831 | ||
832 | if (trace_seq_puts(s, "\n")) | |
833 | return TRACE_TYPE_HANDLED; | |
834 | ||
835 | partial: | |
836 | return TRACE_TYPE_PARTIAL_LINE; | |
837 | } | |
838 | ||
31ba3348 ON |
839 | typedef bool (*filter_func_t)(struct uprobe_consumer *self, |
840 | enum uprobe_filter_ctx ctx, | |
841 | struct mm_struct *mm); | |
842 | ||
843 | static int | |
844 | probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter) | |
f3f096cf | 845 | { |
f3f096cf SD |
846 | int ret = 0; |
847 | ||
14577c39 | 848 | if (trace_probe_is_enabled(&tu->tp)) |
f3f096cf SD |
849 | return -EINTR; |
850 | ||
dcad1a20 NK |
851 | ret = uprobe_buffer_enable(); |
852 | if (ret < 0) | |
853 | return ret; | |
854 | ||
736288ba ON |
855 | WARN_ON(!uprobe_filter_is_empty(&tu->filter)); |
856 | ||
14577c39 | 857 | tu->tp.flags |= flag; |
31ba3348 | 858 | tu->consumer.filter = filter; |
a932b738 ON |
859 | ret = uprobe_register(tu->inode, tu->offset, &tu->consumer); |
860 | if (ret) | |
14577c39 | 861 | tu->tp.flags &= ~flag; |
f3f096cf | 862 | |
4161824f | 863 | return ret; |
f3f096cf SD |
864 | } |
865 | ||
866 | static void probe_event_disable(struct trace_uprobe *tu, int flag) | |
867 | { | |
14577c39 | 868 | if (!trace_probe_is_enabled(&tu->tp)) |
f3f096cf SD |
869 | return; |
870 | ||
736288ba ON |
871 | WARN_ON(!uprobe_filter_is_empty(&tu->filter)); |
872 | ||
a932b738 | 873 | uprobe_unregister(tu->inode, tu->offset, &tu->consumer); |
14577c39 | 874 | tu->tp.flags &= ~flag; |
dcad1a20 NK |
875 | |
876 | uprobe_buffer_disable(); | |
f3f096cf SD |
877 | } |
878 | ||
879 | static int uprobe_event_define_fields(struct ftrace_event_call *event_call) | |
880 | { | |
457d1772 | 881 | int ret, i, size; |
f3f096cf | 882 | struct uprobe_trace_entry_head field; |
457d1772 | 883 | struct trace_uprobe *tu = event_call->data; |
f3f096cf | 884 | |
4d1298e2 ON |
885 | if (is_ret_probe(tu)) { |
886 | DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0); | |
887 | DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0); | |
888 | size = SIZEOF_TRACE_ENTRY(true); | |
889 | } else { | |
890 | DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0); | |
891 | size = SIZEOF_TRACE_ENTRY(false); | |
892 | } | |
f3f096cf | 893 | /* Set argument names as fields */ |
14577c39 NK |
894 | for (i = 0; i < tu->tp.nr_args; i++) { |
895 | struct probe_arg *parg = &tu->tp.args[i]; | |
896 | ||
897 | ret = trace_define_field(event_call, parg->type->fmttype, | |
898 | parg->name, size + parg->offset, | |
899 | parg->type->size, parg->type->is_signed, | |
f3f096cf SD |
900 | FILTER_OTHER); |
901 | ||
902 | if (ret) | |
903 | return ret; | |
904 | } | |
905 | return 0; | |
906 | } | |
907 | ||
f3f096cf | 908 | #ifdef CONFIG_PERF_EVENTS |
31ba3348 ON |
909 | static bool |
910 | __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm) | |
911 | { | |
912 | struct perf_event *event; | |
913 | ||
914 | if (filter->nr_systemwide) | |
915 | return true; | |
916 | ||
917 | list_for_each_entry(event, &filter->perf_events, hw.tp_list) { | |
918 | if (event->hw.tp_target->mm == mm) | |
919 | return true; | |
920 | } | |
921 | ||
922 | return false; | |
923 | } | |
924 | ||
b2fe8ba6 ON |
925 | static inline bool |
926 | uprobe_filter_event(struct trace_uprobe *tu, struct perf_event *event) | |
927 | { | |
928 | return __uprobe_perf_filter(&tu->filter, event->hw.tp_target->mm); | |
929 | } | |
930 | ||
736288ba ON |
931 | static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event) |
932 | { | |
b2fe8ba6 ON |
933 | bool done; |
934 | ||
736288ba | 935 | write_lock(&tu->filter.rwlock); |
b2fe8ba6 ON |
936 | if (event->hw.tp_target) { |
937 | /* | |
938 | * event->parent != NULL means copy_process(), we can avoid | |
939 | * uprobe_apply(). current->mm must be probed and we can rely | |
940 | * on dup_mmap() which preserves the already installed bp's. | |
941 | * | |
942 | * attr.enable_on_exec means that exec/mmap will install the | |
943 | * breakpoints we need. | |
944 | */ | |
945 | done = tu->filter.nr_systemwide || | |
946 | event->parent || event->attr.enable_on_exec || | |
947 | uprobe_filter_event(tu, event); | |
736288ba | 948 | list_add(&event->hw.tp_list, &tu->filter.perf_events); |
b2fe8ba6 ON |
949 | } else { |
950 | done = tu->filter.nr_systemwide; | |
736288ba | 951 | tu->filter.nr_systemwide++; |
b2fe8ba6 | 952 | } |
736288ba ON |
953 | write_unlock(&tu->filter.rwlock); |
954 | ||
b2fe8ba6 ON |
955 | if (!done) |
956 | uprobe_apply(tu->inode, tu->offset, &tu->consumer, true); | |
31ba3348 | 957 | |
736288ba ON |
958 | return 0; |
959 | } | |
960 | ||
961 | static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event) | |
962 | { | |
b2fe8ba6 ON |
963 | bool done; |
964 | ||
736288ba | 965 | write_lock(&tu->filter.rwlock); |
b2fe8ba6 | 966 | if (event->hw.tp_target) { |
736288ba | 967 | list_del(&event->hw.tp_list); |
b2fe8ba6 ON |
968 | done = tu->filter.nr_systemwide || |
969 | (event->hw.tp_target->flags & PF_EXITING) || | |
970 | uprobe_filter_event(tu, event); | |
971 | } else { | |
736288ba | 972 | tu->filter.nr_systemwide--; |
b2fe8ba6 ON |
973 | done = tu->filter.nr_systemwide; |
974 | } | |
736288ba ON |
975 | write_unlock(&tu->filter.rwlock); |
976 | ||
b2fe8ba6 ON |
977 | if (!done) |
978 | uprobe_apply(tu->inode, tu->offset, &tu->consumer, false); | |
31ba3348 | 979 | |
736288ba ON |
980 | return 0; |
981 | } | |
982 | ||
31ba3348 ON |
983 | static bool uprobe_perf_filter(struct uprobe_consumer *uc, |
984 | enum uprobe_filter_ctx ctx, struct mm_struct *mm) | |
985 | { | |
986 | struct trace_uprobe *tu; | |
987 | int ret; | |
988 | ||
989 | tu = container_of(uc, struct trace_uprobe, consumer); | |
990 | read_lock(&tu->filter.rwlock); | |
991 | ret = __uprobe_perf_filter(&tu->filter, mm); | |
992 | read_unlock(&tu->filter.rwlock); | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
a51cc604 ON |
997 | static void uprobe_perf_print(struct trace_uprobe *tu, |
998 | unsigned long func, struct pt_regs *regs) | |
f3f096cf | 999 | { |
14577c39 | 1000 | struct ftrace_event_call *call = &tu->tp.call; |
f3f096cf SD |
1001 | struct uprobe_trace_entry_head *entry; |
1002 | struct hlist_head *head; | |
dcad1a20 | 1003 | struct uprobe_cpu_buffer *ucb; |
457d1772 | 1004 | void *data; |
dcad1a20 NK |
1005 | int size, dsize, esize; |
1006 | int rctx; | |
1007 | ||
1008 | dsize = __get_data_size(&tu->tp, regs); | |
1009 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); | |
f3f096cf | 1010 | |
dcad1a20 NK |
1011 | if (WARN_ON_ONCE(!uprobe_cpu_buffer)) |
1012 | return; | |
1013 | ||
1014 | size = esize + tu->tp.size + dsize; | |
1015 | size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32); | |
1016 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough")) | |
1017 | return; | |
1018 | ||
1019 | ucb = uprobe_buffer_get(); | |
1020 | store_trace_args(esize, &tu->tp, regs, ucb->buf, dsize); | |
f3f096cf SD |
1021 | |
1022 | preempt_disable(); | |
515619f2 ON |
1023 | head = this_cpu_ptr(call->perf_events); |
1024 | if (hlist_empty(head)) | |
1025 | goto out; | |
1026 | ||
f3f096cf SD |
1027 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
1028 | if (!entry) | |
1029 | goto out; | |
1030 | ||
393a736c ON |
1031 | if (is_ret_probe(tu)) { |
1032 | entry->vaddr[0] = func; | |
32520b2c | 1033 | entry->vaddr[1] = instruction_pointer(regs); |
393a736c ON |
1034 | data = DATAOF_TRACE_ENTRY(entry, true); |
1035 | } else { | |
32520b2c | 1036 | entry->vaddr[0] = instruction_pointer(regs); |
393a736c ON |
1037 | data = DATAOF_TRACE_ENTRY(entry, false); |
1038 | } | |
1039 | ||
dcad1a20 NK |
1040 | memcpy(data, ucb->buf, tu->tp.size + dsize); |
1041 | ||
1042 | if (size - esize > tu->tp.size + dsize) { | |
1043 | int len = tu->tp.size + dsize; | |
14577c39 | 1044 | |
dcad1a20 | 1045 | memset(data + len, 0, size - esize - len); |
14577c39 | 1046 | } |
f3f096cf | 1047 | |
32520b2c | 1048 | perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL); |
f3f096cf SD |
1049 | out: |
1050 | preempt_enable(); | |
dcad1a20 | 1051 | uprobe_buffer_put(ucb); |
a51cc604 ON |
1052 | } |
1053 | ||
1054 | /* uprobe profile handler */ | |
1055 | static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs) | |
1056 | { | |
1057 | if (!uprobe_perf_filter(&tu->consumer, 0, current->mm)) | |
1058 | return UPROBE_HANDLER_REMOVE; | |
1059 | ||
393a736c ON |
1060 | if (!is_ret_probe(tu)) |
1061 | uprobe_perf_print(tu, 0, regs); | |
f42d24a1 | 1062 | return 0; |
f3f096cf | 1063 | } |
c1ae5c75 ON |
1064 | |
1065 | static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func, | |
1066 | struct pt_regs *regs) | |
1067 | { | |
1068 | uprobe_perf_print(tu, func, regs); | |
1069 | } | |
f3f096cf SD |
1070 | #endif /* CONFIG_PERF_EVENTS */ |
1071 | ||
1072 | static | |
1073 | int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type, void *data) | |
1074 | { | |
457d1772 | 1075 | struct trace_uprobe *tu = event->data; |
f3f096cf SD |
1076 | |
1077 | switch (type) { | |
1078 | case TRACE_REG_REGISTER: | |
31ba3348 | 1079 | return probe_event_enable(tu, TP_FLAG_TRACE, NULL); |
f3f096cf SD |
1080 | |
1081 | case TRACE_REG_UNREGISTER: | |
1082 | probe_event_disable(tu, TP_FLAG_TRACE); | |
1083 | return 0; | |
1084 | ||
1085 | #ifdef CONFIG_PERF_EVENTS | |
1086 | case TRACE_REG_PERF_REGISTER: | |
31ba3348 | 1087 | return probe_event_enable(tu, TP_FLAG_PROFILE, uprobe_perf_filter); |
f3f096cf SD |
1088 | |
1089 | case TRACE_REG_PERF_UNREGISTER: | |
1090 | probe_event_disable(tu, TP_FLAG_PROFILE); | |
1091 | return 0; | |
736288ba ON |
1092 | |
1093 | case TRACE_REG_PERF_OPEN: | |
1094 | return uprobe_perf_open(tu, data); | |
1095 | ||
1096 | case TRACE_REG_PERF_CLOSE: | |
1097 | return uprobe_perf_close(tu, data); | |
1098 | ||
f3f096cf SD |
1099 | #endif |
1100 | default: | |
1101 | return 0; | |
1102 | } | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs) | |
1107 | { | |
f3f096cf | 1108 | struct trace_uprobe *tu; |
f42d24a1 | 1109 | int ret = 0; |
f3f096cf | 1110 | |
a932b738 | 1111 | tu = container_of(con, struct trace_uprobe, consumer); |
1b47aefd | 1112 | tu->nhit++; |
f3f096cf | 1113 | |
14577c39 | 1114 | if (tu->tp.flags & TP_FLAG_TRACE) |
f42d24a1 | 1115 | ret |= uprobe_trace_func(tu, regs); |
f3f096cf SD |
1116 | |
1117 | #ifdef CONFIG_PERF_EVENTS | |
14577c39 | 1118 | if (tu->tp.flags & TP_FLAG_PROFILE) |
f42d24a1 | 1119 | ret |= uprobe_perf_func(tu, regs); |
f3f096cf | 1120 | #endif |
f42d24a1 | 1121 | return ret; |
f3f096cf SD |
1122 | } |
1123 | ||
c1ae5c75 ON |
1124 | static int uretprobe_dispatcher(struct uprobe_consumer *con, |
1125 | unsigned long func, struct pt_regs *regs) | |
1126 | { | |
1127 | struct trace_uprobe *tu; | |
1128 | ||
1129 | tu = container_of(con, struct trace_uprobe, consumer); | |
1130 | ||
14577c39 | 1131 | if (tu->tp.flags & TP_FLAG_TRACE) |
c1ae5c75 ON |
1132 | uretprobe_trace_func(tu, func, regs); |
1133 | ||
1134 | #ifdef CONFIG_PERF_EVENTS | |
14577c39 | 1135 | if (tu->tp.flags & TP_FLAG_PROFILE) |
c1ae5c75 ON |
1136 | uretprobe_perf_func(tu, func, regs); |
1137 | #endif | |
1138 | return 0; | |
1139 | } | |
1140 | ||
f3f096cf SD |
1141 | static struct trace_event_functions uprobe_funcs = { |
1142 | .trace = print_uprobe_event | |
1143 | }; | |
1144 | ||
1145 | static int register_uprobe_event(struct trace_uprobe *tu) | |
1146 | { | |
14577c39 | 1147 | struct ftrace_event_call *call = &tu->tp.call; |
f3f096cf SD |
1148 | int ret; |
1149 | ||
1150 | /* Initialize ftrace_event_call */ | |
1151 | INIT_LIST_HEAD(&call->class->fields); | |
1152 | call->event.funcs = &uprobe_funcs; | |
1153 | call->class->define_fields = uprobe_event_define_fields; | |
1154 | ||
5bf652aa | 1155 | if (set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0) |
f3f096cf SD |
1156 | return -ENOMEM; |
1157 | ||
1158 | ret = register_ftrace_event(&call->event); | |
1159 | if (!ret) { | |
1160 | kfree(call->print_fmt); | |
1161 | return -ENODEV; | |
1162 | } | |
1163 | call->flags = 0; | |
1164 | call->class->reg = trace_uprobe_register; | |
1165 | call->data = tu; | |
1166 | ret = trace_add_event_call(call); | |
1167 | ||
1168 | if (ret) { | |
1169 | pr_info("Failed to register uprobe event: %s\n", call->name); | |
1170 | kfree(call->print_fmt); | |
1171 | unregister_ftrace_event(&call->event); | |
1172 | } | |
1173 | ||
1174 | return ret; | |
1175 | } | |
1176 | ||
c6c2401d | 1177 | static int unregister_uprobe_event(struct trace_uprobe *tu) |
f3f096cf | 1178 | { |
c6c2401d SRRH |
1179 | int ret; |
1180 | ||
f3f096cf | 1181 | /* tu->event is unregistered in trace_remove_event_call() */ |
14577c39 | 1182 | ret = trace_remove_event_call(&tu->tp.call); |
c6c2401d SRRH |
1183 | if (ret) |
1184 | return ret; | |
14577c39 NK |
1185 | kfree(tu->tp.call.print_fmt); |
1186 | tu->tp.call.print_fmt = NULL; | |
c6c2401d | 1187 | return 0; |
f3f096cf SD |
1188 | } |
1189 | ||
1190 | /* Make a trace interface for controling probe points */ | |
1191 | static __init int init_uprobe_trace(void) | |
1192 | { | |
1193 | struct dentry *d_tracer; | |
1194 | ||
1195 | d_tracer = tracing_init_dentry(); | |
1196 | if (!d_tracer) | |
1197 | return 0; | |
1198 | ||
1199 | trace_create_file("uprobe_events", 0644, d_tracer, | |
1200 | NULL, &uprobe_events_ops); | |
1201 | /* Profile interface */ | |
1202 | trace_create_file("uprobe_profile", 0444, d_tracer, | |
1203 | NULL, &uprobe_profile_ops); | |
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | fs_initcall(init_uprobe_trace); |