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1 | /* |
2 | * Kprobes-based tracing events |
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> |
22 | #include <linux/kprobes.h> |
23 | #include <linux/seq_file.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/smp.h> |
26 | #include <linux/debugfs.h> |
27 | #include <linux/types.h> |
28 | #include <linux/string.h> |
29 | #include <linux/ctype.h> |
30 | #include <linux/ptrace.h> |
31 | #include <linux/perf_event.h> |
32 | #include <linux/stringify.h> |
33 | #include <linux/limits.h> |
34 | #include <linux/uaccess.h> |
35 | #include <asm/bitsperlong.h> |
36 | |
37 | #include "trace.h" |
38 | #include "trace_output.h" |
39 | |
40 | #define MAX_TRACE_ARGS 128 |
41 | #define MAX_ARGSTR_LEN 63 |
42 | #define MAX_EVENT_NAME_LEN 64 |
43 | #define MAX_STRING_SIZE PATH_MAX |
44 | #define KPROBE_EVENT_SYSTEM "kprobes" |
45 | |
46 | /* Reserved field names */ |
47 | #define FIELD_STRING_IP "__probe_ip" |
48 | #define FIELD_STRING_RETIP "__probe_ret_ip" |
49 | #define FIELD_STRING_FUNC "__probe_func" |
50 | |
51 | const char *reserved_field_names[] = { |
52 | "common_type", |
53 | "common_flags", |
54 | "common_preempt_count", |
55 | "common_pid", |
56 | "common_tgid", |
57 | "common_lock_depth", |
58 | FIELD_STRING_IP, |
59 | FIELD_STRING_RETIP, |
60 | FIELD_STRING_FUNC, |
61 | }; |
62 | |
63 | /* Printing function type */ |
64 | typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *, |
65 | void *); |
66 | #define PRINT_TYPE_FUNC_NAME(type) print_type_##type |
67 | #define PRINT_TYPE_FMT_NAME(type) print_type_format_##type |
68 | |
69 | /* Printing in basic type function template */ |
70 | #define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast) \ |
71 | static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \ |
72 | const char *name, \ |
73 | void *data, void *ent)\ |
74 | { \ |
75 | return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\ |
76 | } \ |
77 | static const char PRINT_TYPE_FMT_NAME(type)[] = fmt; |
78 | |
79 | DEFINE_BASIC_PRINT_TYPE_FUNC(u8, "%x", unsigned int) |
80 | DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "%x", unsigned int) |
81 | DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "%lx", unsigned long) |
82 | DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "%llx", unsigned long long) |
83 | DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d", int) |
84 | DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int) |
85 | DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long) |
86 | DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long) |
87 | |
88 | /* data_rloc: data relative location, compatible with u32 */ |
89 | #define make_data_rloc(len, roffs) \ |
90 | (((u32)(len) << 16) | ((u32)(roffs) & 0xffff)) |
91 | #define get_rloc_len(dl) ((u32)(dl) >> 16) |
92 | #define get_rloc_offs(dl) ((u32)(dl) & 0xffff) |
93 | |
94 | static inline void *get_rloc_data(u32 *dl) |
95 | { |
96 | return (u8 *)dl + get_rloc_offs(*dl); |
97 | } |
98 | |
99 | /* For data_loc conversion */ |
100 | static inline void *get_loc_data(u32 *dl, void *ent) |
101 | { |
102 | return (u8 *)ent + get_rloc_offs(*dl); |
103 | } |
104 | |
105 | /* |
106 | * Convert data_rloc to data_loc: |
107 | * data_rloc stores the offset from data_rloc itself, but data_loc |
108 | * stores the offset from event entry. |
109 | */ |
110 | #define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs)) |
111 | |
112 | /* For defining macros, define string/string_size types */ |
113 | typedef u32 string; |
114 | typedef u32 string_size; |
115 | |
116 | /* Print type function for string type */ |
117 | static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, |
118 | const char *name, |
119 | void *data, void *ent) |
120 | { |
121 | int len = *(u32 *)data >> 16; |
122 | |
123 | if (!len) |
124 | return trace_seq_printf(s, " %s=(fault)", name); |
125 | else |
126 | return trace_seq_printf(s, " %s=\"%s\"", name, |
127 | (const char *)get_loc_data(data, ent)); |
128 | } |
129 | static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\""; |
130 | |
131 | /* Data fetch function type */ |
132 | typedef void (*fetch_func_t)(struct pt_regs *, void *, void *); |
133 | |
134 | struct fetch_param { |
135 | fetch_func_t fn; |
136 | void *data; |
137 | }; |
138 | |
139 | static __kprobes void call_fetch(struct fetch_param *fprm, |
140 | struct pt_regs *regs, void *dest) |
141 | { |
142 | return fprm->fn(regs, fprm->data, dest); |
143 | } |
144 | |
145 | #define FETCH_FUNC_NAME(method, type) fetch_##method##_##type |
146 | /* |
147 | * Define macro for basic types - we don't need to define s* types, because |
148 | * we have to care only about bitwidth at recording time. |
149 | */ |
150 | #define DEFINE_BASIC_FETCH_FUNCS(method) \ |
151 | DEFINE_FETCH_##method(u8) \ |
152 | DEFINE_FETCH_##method(u16) \ |
153 | DEFINE_FETCH_##method(u32) \ |
154 | DEFINE_FETCH_##method(u64) |
155 | |
156 | #define CHECK_FETCH_FUNCS(method, fn) \ |
157 | (((FETCH_FUNC_NAME(method, u8) == fn) || \ |
158 | (FETCH_FUNC_NAME(method, u16) == fn) || \ |
159 | (FETCH_FUNC_NAME(method, u32) == fn) || \ |
160 | (FETCH_FUNC_NAME(method, u64) == fn) || \ |
161 | (FETCH_FUNC_NAME(method, string) == fn) || \ |
162 | (FETCH_FUNC_NAME(method, string_size) == fn)) \ |
163 | && (fn != NULL)) |
164 | |
165 | /* Data fetch function templates */ |
166 | #define DEFINE_FETCH_reg(type) \ |
167 | static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \ |
168 | void *offset, void *dest) \ |
169 | { \ |
170 | *(type *)dest = (type)regs_get_register(regs, \ |
171 | (unsigned int)((unsigned long)offset)); \ |
172 | } |
173 | DEFINE_BASIC_FETCH_FUNCS(reg) |
174 | /* No string on the register */ |
175 | #define fetch_reg_string NULL |
176 | #define fetch_reg_string_size NULL |
177 | |
178 | #define DEFINE_FETCH_stack(type) \ |
179 | static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\ |
180 | void *offset, void *dest) \ |
181 | { \ |
182 | *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \ |
183 | (unsigned int)((unsigned long)offset)); \ |
184 | } |
185 | DEFINE_BASIC_FETCH_FUNCS(stack) |
186 | /* No string on the stack entry */ |
187 | #define fetch_stack_string NULL |
188 | #define fetch_stack_string_size NULL |
189 | |
190 | #define DEFINE_FETCH_retval(type) \ |
191 | static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\ |
192 | void *dummy, void *dest) \ |
193 | { \ |
194 | *(type *)dest = (type)regs_return_value(regs); \ |
195 | } |
196 | DEFINE_BASIC_FETCH_FUNCS(retval) |
197 | /* No string on the retval */ |
198 | #define fetch_retval_string NULL |
199 | #define fetch_retval_string_size NULL |
200 | |
201 | #define DEFINE_FETCH_memory(type) \ |
202 | static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\ |
203 | void *addr, void *dest) \ |
204 | { \ |
205 | type retval; \ |
206 | if (probe_kernel_address(addr, retval)) \ |
207 | *(type *)dest = 0; \ |
208 | else \ |
209 | *(type *)dest = retval; \ |
210 | } |
211 | DEFINE_BASIC_FETCH_FUNCS(memory) |
212 | /* |
213 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max |
214 | * length and relative data location. |
215 | */ |
216 | static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs, |
217 | void *addr, void *dest) |
218 | { |
219 | long ret; |
220 | int maxlen = get_rloc_len(*(u32 *)dest); |
221 | u8 *dst = get_rloc_data(dest); |
222 | u8 *src = addr; |
223 | mm_segment_t old_fs = get_fs(); |
224 | if (!maxlen) |
225 | return; |
226 | /* |
227 | * Try to get string again, since the string can be changed while |
228 | * probing. |
229 | */ |
230 | set_fs(KERNEL_DS); |
231 | pagefault_disable(); |
232 | do |
233 | ret = __copy_from_user_inatomic(dst++, src++, 1); |
234 | while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen); |
235 | dst[-1] = '\0'; |
236 | pagefault_enable(); |
237 | set_fs(old_fs); |
238 | |
239 | if (ret < 0) { /* Failed to fetch string */ |
240 | ((u8 *)get_rloc_data(dest))[0] = '\0'; |
241 | *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest)); |
242 | } else |
243 | *(u32 *)dest = make_data_rloc(src - (u8 *)addr, |
244 | get_rloc_offs(*(u32 *)dest)); |
245 | } |
246 | /* Return the length of string -- including null terminal byte */ |
247 | static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, |
248 | void *addr, void *dest) |
249 | { |
250 | int ret, len = 0; |
251 | u8 c; |
252 | mm_segment_t old_fs = get_fs(); |
253 | |
254 | set_fs(KERNEL_DS); |
255 | pagefault_disable(); |
256 | do { |
257 | ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1); |
258 | len++; |
259 | } while (c && ret == 0 && len < MAX_STRING_SIZE); |
260 | pagefault_enable(); |
261 | set_fs(old_fs); |
262 | |
263 | if (ret < 0) /* Failed to check the length */ |
264 | *(u32 *)dest = 0; |
265 | else |
266 | *(u32 *)dest = len; |
267 | } |
268 | |
269 | /* Memory fetching by symbol */ |
270 | struct symbol_cache { |
271 | char *symbol; |
272 | long offset; |
273 | unsigned long addr; |
274 | }; |
275 | |
276 | static unsigned long update_symbol_cache(struct symbol_cache *sc) |
277 | { |
278 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); |
279 | if (sc->addr) |
280 | sc->addr += sc->offset; |
281 | return sc->addr; |
282 | } |
283 | |
284 | static void free_symbol_cache(struct symbol_cache *sc) |
285 | { |
286 | kfree(sc->symbol); |
287 | kfree(sc); |
288 | } |
289 | |
290 | static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) |
291 | { |
292 | struct symbol_cache *sc; |
293 | |
294 | if (!sym || strlen(sym) == 0) |
295 | return NULL; |
296 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); |
297 | if (!sc) |
298 | return NULL; |
299 | |
300 | sc->symbol = kstrdup(sym, GFP_KERNEL); |
301 | if (!sc->symbol) { |
302 | kfree(sc); |
303 | return NULL; |
304 | } |
305 | sc->offset = offset; |
306 | |
307 | update_symbol_cache(sc); |
308 | return sc; |
309 | } |
310 | |
311 | #define DEFINE_FETCH_symbol(type) \ |
312 | static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\ |
313 | void *data, void *dest) \ |
314 | { \ |
315 | struct symbol_cache *sc = data; \ |
316 | if (sc->addr) \ |
317 | fetch_memory_##type(regs, (void *)sc->addr, dest); \ |
318 | else \ |
319 | *(type *)dest = 0; \ |
320 | } |
321 | DEFINE_BASIC_FETCH_FUNCS(symbol) |
322 | DEFINE_FETCH_symbol(string) |
323 | DEFINE_FETCH_symbol(string_size) |
324 | |
325 | /* Dereference memory access function */ |
326 | struct deref_fetch_param { |
327 | struct fetch_param orig; |
328 | long offset; |
329 | }; |
330 | |
331 | #define DEFINE_FETCH_deref(type) \ |
332 | static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\ |
333 | void *data, void *dest) \ |
334 | { \ |
335 | struct deref_fetch_param *dprm = data; \ |
336 | unsigned long addr; \ |
337 | call_fetch(&dprm->orig, regs, &addr); \ |
338 | if (addr) { \ |
339 | addr += dprm->offset; \ |
340 | fetch_memory_##type(regs, (void *)addr, dest); \ |
341 | } else \ |
342 | *(type *)dest = 0; \ |
343 | } |
344 | DEFINE_BASIC_FETCH_FUNCS(deref) |
345 | DEFINE_FETCH_deref(string) |
346 | DEFINE_FETCH_deref(string_size) |
347 | |
348 | static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data) |
349 | { |
350 | if (CHECK_FETCH_FUNCS(deref, data->orig.fn)) |
351 | free_deref_fetch_param(data->orig.data); |
352 | else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn)) |
353 | free_symbol_cache(data->orig.data); |
354 | kfree(data); |
355 | } |
356 | |
357 | /* Default (unsigned long) fetch type */ |
358 | #define __DEFAULT_FETCH_TYPE(t) u##t |
359 | #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t) |
360 | #define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG) |
361 | #define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE) |
362 | |
363 | /* Fetch types */ |
364 | enum { |
365 | FETCH_MTD_reg = 0, |
366 | FETCH_MTD_stack, |
367 | FETCH_MTD_retval, |
368 | FETCH_MTD_memory, |
369 | FETCH_MTD_symbol, |
370 | FETCH_MTD_deref, |
371 | FETCH_MTD_END, |
372 | }; |
373 | |
374 | #define ASSIGN_FETCH_FUNC(method, type) \ |
375 | [FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type) |
376 | |
377 | #define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \ |
378 | {.name = _name, \ |
379 | .size = _size, \ |
380 | .is_signed = sign, \ |
381 | .print = PRINT_TYPE_FUNC_NAME(ptype), \ |
382 | .fmt = PRINT_TYPE_FMT_NAME(ptype), \ |
383 | .fmttype = _fmttype, \ |
384 | .fetch = { \ |
385 | ASSIGN_FETCH_FUNC(reg, ftype), \ |
386 | ASSIGN_FETCH_FUNC(stack, ftype), \ |
387 | ASSIGN_FETCH_FUNC(retval, ftype), \ |
388 | ASSIGN_FETCH_FUNC(memory, ftype), \ |
389 | ASSIGN_FETCH_FUNC(symbol, ftype), \ |
390 | ASSIGN_FETCH_FUNC(deref, ftype), \ |
391 | } \ |
392 | } |
393 | |
394 | #define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \ |
395 | __ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype) |
396 | |
397 | #define FETCH_TYPE_STRING 0 |
398 | #define FETCH_TYPE_STRSIZE 1 |
399 | |
400 | /* Fetch type information table */ |
401 | static const struct fetch_type { |
402 | const char *name; /* Name of type */ |
403 | size_t size; /* Byte size of type */ |
404 | int is_signed; /* Signed flag */ |
405 | print_type_func_t print; /* Print functions */ |
406 | const char *fmt; /* Fromat string */ |
407 | const char *fmttype; /* Name in format file */ |
408 | /* Fetch functions */ |
409 | fetch_func_t fetch[FETCH_MTD_END]; |
410 | } fetch_type_table[] = { |
411 | /* Special types */ |
412 | [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string, |
413 | sizeof(u32), 1, "__data_loc char[]"), |
414 | [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32, |
415 | string_size, sizeof(u32), 0, "u32"), |
416 | /* Basic types */ |
417 | ASSIGN_FETCH_TYPE(u8, u8, 0), |
418 | ASSIGN_FETCH_TYPE(u16, u16, 0), |
419 | ASSIGN_FETCH_TYPE(u32, u32, 0), |
420 | ASSIGN_FETCH_TYPE(u64, u64, 0), |
421 | ASSIGN_FETCH_TYPE(s8, u8, 1), |
422 | ASSIGN_FETCH_TYPE(s16, u16, 1), |
423 | ASSIGN_FETCH_TYPE(s32, u32, 1), |
424 | ASSIGN_FETCH_TYPE(s64, u64, 1), |
425 | }; |
426 | |
427 | static const struct fetch_type *find_fetch_type(const char *type) |
428 | { |
429 | int i; |
430 | |
431 | if (!type) |
432 | type = DEFAULT_FETCH_TYPE_STR; |
433 | |
434 | for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++) |
435 | if (strcmp(type, fetch_type_table[i].name) == 0) |
436 | return &fetch_type_table[i]; |
437 | return NULL; |
438 | } |
439 | |
440 | /* Special function : only accept unsigned long */ |
441 | static __kprobes void fetch_stack_address(struct pt_regs *regs, |
442 | void *dummy, void *dest) |
443 | { |
444 | *(unsigned long *)dest = kernel_stack_pointer(regs); |
445 | } |
446 | |
447 | static fetch_func_t get_fetch_size_function(const struct fetch_type *type, |
448 | fetch_func_t orig_fn) |
449 | { |
450 | int i; |
451 | |
452 | if (type != &fetch_type_table[FETCH_TYPE_STRING]) |
453 | return NULL; /* Only string type needs size function */ |
454 | for (i = 0; i < FETCH_MTD_END; i++) |
455 | if (type->fetch[i] == orig_fn) |
456 | return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i]; |
457 | |
458 | WARN_ON(1); /* This should not happen */ |
459 | return NULL; |
460 | } |
461 | |
462 | /** |
463 | * Kprobe event core functions |
464 | */ |
465 | |
466 | struct probe_arg { |
467 | struct fetch_param fetch; |
468 | struct fetch_param fetch_size; |
469 | unsigned int offset; /* Offset from argument entry */ |
470 | const char *name; /* Name of this argument */ |
471 | const char *comm; /* Command of this argument */ |
472 | const struct fetch_type *type; /* Type of this argument */ |
473 | }; |
474 | |
475 | /* Flags for trace_probe */ |
476 | #define TP_FLAG_TRACE 1 |
477 | #define TP_FLAG_PROFILE 2 |
478 | |
479 | struct trace_probe { |
480 | struct list_head list; |
481 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
482 | unsigned long nhit; |
483 | unsigned int flags; /* For TP_FLAG_* */ |
484 | const char *symbol; /* symbol name */ |
485 | struct ftrace_event_class class; |
486 | struct ftrace_event_call call; |
487 | ssize_t size; /* trace entry size */ |
488 | unsigned int nr_args; |
489 | struct probe_arg args[]; |
490 | }; |
491 | |
492 | #define SIZEOF_TRACE_PROBE(n) \ |
493 | (offsetof(struct trace_probe, args) + \ |
494 | (sizeof(struct probe_arg) * (n))) |
495 | |
496 | |
497 | static __kprobes int probe_is_return(struct trace_probe *tp) |
498 | { |
499 | return tp->rp.handler != NULL; |
500 | } |
501 | |
502 | static __kprobes const char *probe_symbol(struct trace_probe *tp) |
503 | { |
504 | return tp->symbol ? tp->symbol : "unknown"; |
505 | } |
506 | |
507 | static int register_probe_event(struct trace_probe *tp); |
508 | static void unregister_probe_event(struct trace_probe *tp); |
509 | |
510 | static DEFINE_MUTEX(probe_lock); |
511 | static LIST_HEAD(probe_list); |
512 | |
513 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
514 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, |
515 | struct pt_regs *regs); |
516 | |
517 | /* Check the name is good for event/group/fields */ |
518 | static int is_good_name(const char *name) |
519 | { |
520 | if (!isalpha(*name) && *name != '_') |
521 | return 0; |
522 | while (*++name != '\0') { |
523 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') |
524 | return 0; |
525 | } |
526 | return 1; |
527 | } |
528 | |
529 | /* |
530 | * Allocate new trace_probe and initialize it (including kprobes). |
531 | */ |
532 | static struct trace_probe *alloc_trace_probe(const char *group, |
533 | const char *event, |
534 | void *addr, |
535 | const char *symbol, |
536 | unsigned long offs, |
537 | int nargs, int is_return) |
538 | { |
539 | struct trace_probe *tp; |
540 | int ret = -ENOMEM; |
541 | |
542 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
543 | if (!tp) |
544 | return ERR_PTR(ret); |
545 | |
546 | if (symbol) { |
547 | tp->symbol = kstrdup(symbol, GFP_KERNEL); |
548 | if (!tp->symbol) |
549 | goto error; |
550 | tp->rp.kp.symbol_name = tp->symbol; |
551 | tp->rp.kp.offset = offs; |
552 | } else |
553 | tp->rp.kp.addr = addr; |
554 | |
555 | if (is_return) |
556 | tp->rp.handler = kretprobe_dispatcher; |
557 | else |
558 | tp->rp.kp.pre_handler = kprobe_dispatcher; |
559 | |
560 | if (!event || !is_good_name(event)) { |
561 | ret = -EINVAL; |
562 | goto error; |
563 | } |
564 | |
565 | tp->call.class = &tp->class; |
566 | tp->call.name = kstrdup(event, GFP_KERNEL); |
567 | if (!tp->call.name) |
568 | goto error; |
569 | |
570 | if (!group || !is_good_name(group)) { |
571 | ret = -EINVAL; |
572 | goto error; |
573 | } |
574 | |
575 | tp->class.system = kstrdup(group, GFP_KERNEL); |
576 | if (!tp->class.system) |
577 | goto error; |
578 | |
579 | INIT_LIST_HEAD(&tp->list); |
580 | return tp; |
581 | error: |
582 | kfree(tp->call.name); |
583 | kfree(tp->symbol); |
584 | kfree(tp); |
585 | return ERR_PTR(ret); |
586 | } |
587 | |
588 | static void free_probe_arg(struct probe_arg *arg) |
589 | { |
590 | if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn)) |
591 | free_deref_fetch_param(arg->fetch.data); |
592 | else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn)) |
593 | free_symbol_cache(arg->fetch.data); |
594 | kfree(arg->name); |
595 | kfree(arg->comm); |
596 | } |
597 | |
598 | static void free_trace_probe(struct trace_probe *tp) |
599 | { |
600 | int i; |
601 | |
602 | for (i = 0; i < tp->nr_args; i++) |
603 | free_probe_arg(&tp->args[i]); |
604 | |
605 | kfree(tp->call.class->system); |
606 | kfree(tp->call.name); |
607 | kfree(tp->symbol); |
608 | kfree(tp); |
609 | } |
610 | |
611 | static struct trace_probe *find_probe_event(const char *event, |
612 | const char *group) |
613 | { |
614 | struct trace_probe *tp; |
615 | |
616 | list_for_each_entry(tp, &probe_list, list) |
617 | if (strcmp(tp->call.name, event) == 0 && |
618 | strcmp(tp->call.class->system, group) == 0) |
619 | return tp; |
620 | return NULL; |
621 | } |
622 | |
623 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ |
624 | static void unregister_trace_probe(struct trace_probe *tp) |
625 | { |
626 | if (probe_is_return(tp)) |
627 | unregister_kretprobe(&tp->rp); |
628 | else |
629 | unregister_kprobe(&tp->rp.kp); |
630 | list_del(&tp->list); |
631 | unregister_probe_event(tp); |
632 | } |
633 | |
634 | /* Register a trace_probe and probe_event */ |
635 | static int register_trace_probe(struct trace_probe *tp) |
636 | { |
637 | struct trace_probe *old_tp; |
638 | int ret; |
639 | |
640 | mutex_lock(&probe_lock); |
641 | |
642 | /* register as an event */ |
643 | old_tp = find_probe_event(tp->call.name, tp->call.class->system); |
644 | if (old_tp) { |
645 | /* delete old event */ |
646 | unregister_trace_probe(old_tp); |
647 | free_trace_probe(old_tp); |
648 | } |
649 | ret = register_probe_event(tp); |
650 | if (ret) { |
651 | pr_warning("Faild to register probe event(%d)\n", ret); |
652 | goto end; |
653 | } |
654 | |
655 | tp->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
656 | if (probe_is_return(tp)) |
657 | ret = register_kretprobe(&tp->rp); |
658 | else |
659 | ret = register_kprobe(&tp->rp.kp); |
660 | |
661 | if (ret) { |
662 | pr_warning("Could not insert probe(%d)\n", ret); |
663 | if (ret == -EILSEQ) { |
664 | pr_warning("Probing address(0x%p) is not an " |
665 | "instruction boundary.\n", |
666 | tp->rp.kp.addr); |
667 | ret = -EINVAL; |
668 | } |
669 | unregister_probe_event(tp); |
670 | } else |
671 | list_add_tail(&tp->list, &probe_list); |
672 | end: |
673 | mutex_unlock(&probe_lock); |
674 | return ret; |
675 | } |
676 | |
677 | /* Split symbol and offset. */ |
678 | static int split_symbol_offset(char *symbol, unsigned long *offset) |
679 | { |
680 | char *tmp; |
681 | int ret; |
682 | |
683 | if (!offset) |
684 | return -EINVAL; |
685 | |
686 | tmp = strchr(symbol, '+'); |
687 | if (tmp) { |
688 | /* skip sign because strict_strtol doesn't accept '+' */ |
689 | ret = strict_strtoul(tmp + 1, 0, offset); |
690 | if (ret) |
691 | return ret; |
692 | *tmp = '\0'; |
693 | } else |
694 | *offset = 0; |
695 | return 0; |
696 | } |
697 | |
698 | #define PARAM_MAX_ARGS 16 |
699 | #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long)) |
700 | |
701 | static int parse_probe_vars(char *arg, const struct fetch_type *t, |
702 | struct fetch_param *f, int is_return) |
703 | { |
704 | int ret = 0; |
705 | unsigned long param; |
706 | |
707 | if (strcmp(arg, "retval") == 0) { |
708 | if (is_return) |
709 | f->fn = t->fetch[FETCH_MTD_retval]; |
710 | else |
711 | ret = -EINVAL; |
712 | } else if (strncmp(arg, "stack", 5) == 0) { |
713 | if (arg[5] == '\0') { |
714 | if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0) |
715 | f->fn = fetch_stack_address; |
716 | else |
717 | ret = -EINVAL; |
718 | } else if (isdigit(arg[5])) { |
719 | ret = strict_strtoul(arg + 5, 10, ¶m); |
720 | if (ret || param > PARAM_MAX_STACK) |
721 | ret = -EINVAL; |
722 | else { |
723 | f->fn = t->fetch[FETCH_MTD_stack]; |
724 | f->data = (void *)param; |
725 | } |
726 | } else |
727 | ret = -EINVAL; |
728 | } else |
729 | ret = -EINVAL; |
730 | return ret; |
731 | } |
732 | |
733 | /* Recursive argument parser */ |
734 | static int __parse_probe_arg(char *arg, const struct fetch_type *t, |
735 | struct fetch_param *f, int is_return) |
736 | { |
737 | int ret = 0; |
738 | unsigned long param; |
739 | long offset; |
740 | char *tmp; |
741 | |
742 | switch (arg[0]) { |
743 | case '$': |
744 | ret = parse_probe_vars(arg + 1, t, f, is_return); |
745 | break; |
746 | case '%': /* named register */ |
747 | ret = regs_query_register_offset(arg + 1); |
748 | if (ret >= 0) { |
749 | f->fn = t->fetch[FETCH_MTD_reg]; |
750 | f->data = (void *)(unsigned long)ret; |
751 | ret = 0; |
752 | } |
753 | break; |
754 | case '@': /* memory or symbol */ |
755 | if (isdigit(arg[1])) { |
756 | ret = strict_strtoul(arg + 1, 0, ¶m); |
757 | if (ret) |
758 | break; |
759 | f->fn = t->fetch[FETCH_MTD_memory]; |
760 | f->data = (void *)param; |
761 | } else { |
762 | ret = split_symbol_offset(arg + 1, &offset); |
763 | if (ret) |
764 | break; |
765 | f->data = alloc_symbol_cache(arg + 1, offset); |
766 | if (f->data) |
767 | f->fn = t->fetch[FETCH_MTD_symbol]; |
768 | } |
769 | break; |
770 | case '+': /* deref memory */ |
771 | case '-': |
772 | tmp = strchr(arg, '('); |
773 | if (!tmp) |
774 | break; |
775 | *tmp = '\0'; |
776 | ret = strict_strtol(arg + 1, 0, &offset); |
777 | if (ret) |
778 | break; |
779 | if (arg[0] == '-') |
780 | offset = -offset; |
781 | arg = tmp + 1; |
782 | tmp = strrchr(arg, ')'); |
783 | if (tmp) { |
784 | struct deref_fetch_param *dprm; |
785 | const struct fetch_type *t2 = find_fetch_type(NULL); |
786 | *tmp = '\0'; |
787 | dprm = kzalloc(sizeof(struct deref_fetch_param), |
788 | GFP_KERNEL); |
789 | if (!dprm) |
790 | return -ENOMEM; |
791 | dprm->offset = offset; |
792 | ret = __parse_probe_arg(arg, t2, &dprm->orig, |
793 | is_return); |
794 | if (ret) |
795 | kfree(dprm); |
796 | else { |
797 | f->fn = t->fetch[FETCH_MTD_deref]; |
798 | f->data = (void *)dprm; |
799 | } |
800 | } |
801 | break; |
802 | } |
803 | if (!ret && !f->fn) { /* Parsed, but do not find fetch method */ |
804 | pr_info("%s type has no corresponding fetch method.\n", |
805 | t->name); |
806 | ret = -EINVAL; |
807 | } |
808 | return ret; |
809 | } |
810 | |
811 | /* String length checking wrapper */ |
812 | static int parse_probe_arg(char *arg, struct trace_probe *tp, |
813 | struct probe_arg *parg, int is_return) |
814 | { |
815 | const char *t; |
816 | int ret; |
817 | |
818 | if (strlen(arg) > MAX_ARGSTR_LEN) { |
819 | pr_info("Argument is too long.: %s\n", arg); |
820 | return -ENOSPC; |
821 | } |
822 | parg->comm = kstrdup(arg, GFP_KERNEL); |
823 | if (!parg->comm) { |
824 | pr_info("Failed to allocate memory for command '%s'.\n", arg); |
825 | return -ENOMEM; |
826 | } |
827 | t = strchr(parg->comm, ':'); |
828 | if (t) { |
829 | arg[t - parg->comm] = '\0'; |
830 | t++; |
831 | } |
832 | parg->type = find_fetch_type(t); |
833 | if (!parg->type) { |
834 | pr_info("Unsupported type: %s\n", t); |
835 | return -EINVAL; |
836 | } |
837 | parg->offset = tp->size; |
838 | tp->size += parg->type->size; |
839 | ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return); |
840 | if (ret >= 0) { |
841 | parg->fetch_size.fn = get_fetch_size_function(parg->type, |
842 | parg->fetch.fn); |
843 | parg->fetch_size.data = parg->fetch.data; |
844 | } |
845 | return ret; |
846 | } |
847 | |
848 | /* Return 1 if name is reserved or already used by another argument */ |
849 | static int conflict_field_name(const char *name, |
850 | struct probe_arg *args, int narg) |
851 | { |
852 | int i; |
853 | for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++) |
854 | if (strcmp(reserved_field_names[i], name) == 0) |
855 | return 1; |
856 | for (i = 0; i < narg; i++) |
857 | if (strcmp(args[i].name, name) == 0) |
858 | return 1; |
859 | return 0; |
860 | } |
861 | |
862 | static int create_trace_probe(int argc, char **argv) |
863 | { |
864 | /* |
865 | * Argument syntax: |
866 | * - Add kprobe: p[:[GRP/]EVENT] KSYM[+OFFS]|KADDR [FETCHARGS] |
867 | * - Add kretprobe: r[:[GRP/]EVENT] KSYM[+0] [FETCHARGS] |
868 | * Fetch args: |
869 | * $retval : fetch return value |
870 | * $stack : fetch stack address |
871 | * $stackN : fetch Nth of stack (N:0-) |
872 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
873 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) |
874 | * %REG : fetch register REG |
875 | * Dereferencing memory fetch: |
876 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
877 | * Alias name of args: |
878 | * NAME=FETCHARG : set NAME as alias of FETCHARG. |
879 | * Type of args: |
880 | * FETCHARG:TYPE : use TYPE instead of unsigned long. |
881 | */ |
882 | struct trace_probe *tp; |
883 | int i, ret = 0; |
884 | int is_return = 0, is_delete = 0; |
885 | char *symbol = NULL, *event = NULL, *group = NULL; |
886 | char *arg; |
887 | unsigned long offset = 0; |
888 | void *addr = NULL; |
889 | char buf[MAX_EVENT_NAME_LEN]; |
890 | |
891 | /* argc must be >= 1 */ |
892 | if (argv[0][0] == 'p') |
893 | is_return = 0; |
894 | else if (argv[0][0] == 'r') |
895 | is_return = 1; |
896 | else if (argv[0][0] == '-') |
897 | is_delete = 1; |
898 | else { |
899 | pr_info("Probe definition must be started with 'p', 'r' or" |
900 | " '-'.\n"); |
901 | return -EINVAL; |
902 | } |
903 | |
904 | if (argv[0][1] == ':') { |
905 | event = &argv[0][2]; |
906 | if (strchr(event, '/')) { |
907 | group = event; |
908 | event = strchr(group, '/') + 1; |
909 | event[-1] = '\0'; |
910 | if (strlen(group) == 0) { |
911 | pr_info("Group name is not specified\n"); |
912 | return -EINVAL; |
913 | } |
914 | } |
915 | if (strlen(event) == 0) { |
916 | pr_info("Event name is not specified\n"); |
917 | return -EINVAL; |
918 | } |
919 | } |
920 | if (!group) |
921 | group = KPROBE_EVENT_SYSTEM; |
922 | |
923 | if (is_delete) { |
924 | if (!event) { |
925 | pr_info("Delete command needs an event name.\n"); |
926 | return -EINVAL; |
927 | } |
928 | mutex_lock(&probe_lock); |
929 | tp = find_probe_event(event, group); |
930 | if (!tp) { |
931 | mutex_unlock(&probe_lock); |
932 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
933 | return -ENOENT; |
934 | } |
935 | /* delete an event */ |
936 | unregister_trace_probe(tp); |
937 | free_trace_probe(tp); |
938 | mutex_unlock(&probe_lock); |
939 | return 0; |
940 | } |
941 | |
942 | if (argc < 2) { |
943 | pr_info("Probe point is not specified.\n"); |
944 | return -EINVAL; |
945 | } |
946 | if (isdigit(argv[1][0])) { |
947 | if (is_return) { |
948 | pr_info("Return probe point must be a symbol.\n"); |
949 | return -EINVAL; |
950 | } |
951 | /* an address specified */ |
952 | ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr); |
953 | if (ret) { |
954 | pr_info("Failed to parse address.\n"); |
955 | return ret; |
956 | } |
957 | } else { |
958 | /* a symbol specified */ |
959 | symbol = argv[1]; |
960 | /* TODO: support .init module functions */ |
961 | ret = split_symbol_offset(symbol, &offset); |
962 | if (ret) { |
963 | pr_info("Failed to parse symbol.\n"); |
964 | return ret; |
965 | } |
966 | if (offset && is_return) { |
967 | pr_info("Return probe must be used without offset.\n"); |
968 | return -EINVAL; |
969 | } |
970 | } |
971 | argc -= 2; argv += 2; |
972 | |
973 | /* setup a probe */ |
974 | if (!event) { |
975 | /* Make a new event name */ |
976 | if (symbol) |
977 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
978 | is_return ? 'r' : 'p', symbol, offset); |
979 | else |
980 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
981 | is_return ? 'r' : 'p', addr); |
982 | event = buf; |
983 | } |
984 | tp = alloc_trace_probe(group, event, addr, symbol, offset, argc, |
985 | is_return); |
986 | if (IS_ERR(tp)) { |
987 | pr_info("Failed to allocate trace_probe.(%d)\n", |
988 | (int)PTR_ERR(tp)); |
989 | return PTR_ERR(tp); |
990 | } |
991 | |
992 | /* parse arguments */ |
993 | ret = 0; |
994 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
995 | /* Increment count for freeing args in error case */ |
996 | tp->nr_args++; |
997 | |
998 | /* Parse argument name */ |
999 | arg = strchr(argv[i], '='); |
1000 | if (arg) { |
1001 | *arg++ = '\0'; |
1002 | tp->args[i].name = kstrdup(argv[i], GFP_KERNEL); |
1003 | } else { |
1004 | arg = argv[i]; |
1005 | /* If argument name is omitted, set "argN" */ |
1006 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); |
1007 | tp->args[i].name = kstrdup(buf, GFP_KERNEL); |
1008 | } |
1009 | |
1010 | if (!tp->args[i].name) { |
1011 | pr_info("Failed to allocate argument[%d] name.\n", i); |
1012 | ret = -ENOMEM; |
1013 | goto error; |
1014 | } |
1015 | |
1016 | if (!is_good_name(tp->args[i].name)) { |
1017 | pr_info("Invalid argument[%d] name: %s\n", |
1018 | i, tp->args[i].name); |
1019 | ret = -EINVAL; |
1020 | goto error; |
1021 | } |
1022 | |
1023 | if (conflict_field_name(tp->args[i].name, tp->args, i)) { |
1024 | pr_info("Argument[%d] name '%s' conflicts with " |
1025 | "another field.\n", i, argv[i]); |
1026 | ret = -EINVAL; |
1027 | goto error; |
1028 | } |
1029 | |
1030 | /* Parse fetch argument */ |
1031 | ret = parse_probe_arg(arg, tp, &tp->args[i], is_return); |
1032 | if (ret) { |
1033 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
1034 | goto error; |
1035 | } |
1036 | } |
1037 | |
1038 | ret = register_trace_probe(tp); |
1039 | if (ret) |
1040 | goto error; |
1041 | return 0; |
1042 | |
1043 | error: |
1044 | free_trace_probe(tp); |
1045 | return ret; |
1046 | } |
1047 | |
1048 | static void cleanup_all_probes(void) |
1049 | { |
1050 | struct trace_probe *tp; |
1051 | |
1052 | mutex_lock(&probe_lock); |
1053 | /* TODO: Use batch unregistration */ |
1054 | while (!list_empty(&probe_list)) { |
1055 | tp = list_entry(probe_list.next, struct trace_probe, list); |
1056 | unregister_trace_probe(tp); |
1057 | free_trace_probe(tp); |
1058 | } |
1059 | mutex_unlock(&probe_lock); |
1060 | } |
1061 | |
1062 | |
1063 | /* Probes listing interfaces */ |
1064 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) |
1065 | { |
1066 | mutex_lock(&probe_lock); |
1067 | return seq_list_start(&probe_list, *pos); |
1068 | } |
1069 | |
1070 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) |
1071 | { |
1072 | return seq_list_next(v, &probe_list, pos); |
1073 | } |
1074 | |
1075 | static void probes_seq_stop(struct seq_file *m, void *v) |
1076 | { |
1077 | mutex_unlock(&probe_lock); |
1078 | } |
1079 | |
1080 | static int probes_seq_show(struct seq_file *m, void *v) |
1081 | { |
1082 | struct trace_probe *tp = v; |
1083 | int i; |
1084 | |
1085 | seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p'); |
1086 | seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name); |
1087 | |
1088 | if (!tp->symbol) |
1089 | seq_printf(m, " 0x%p", tp->rp.kp.addr); |
1090 | else if (tp->rp.kp.offset) |
1091 | seq_printf(m, " %s+%u", probe_symbol(tp), tp->rp.kp.offset); |
1092 | else |
1093 | seq_printf(m, " %s", probe_symbol(tp)); |
1094 | |
1095 | for (i = 0; i < tp->nr_args; i++) |
1096 | seq_printf(m, " %s=%s", tp->args[i].name, tp->args[i].comm); |
1097 | seq_printf(m, "\n"); |
1098 | |
1099 | return 0; |
1100 | } |
1101 | |
1102 | static const struct seq_operations probes_seq_op = { |
1103 | .start = probes_seq_start, |
1104 | .next = probes_seq_next, |
1105 | .stop = probes_seq_stop, |
1106 | .show = probes_seq_show |
1107 | }; |
1108 | |
1109 | static int probes_open(struct inode *inode, struct file *file) |
1110 | { |
1111 | if ((file->f_mode & FMODE_WRITE) && |
1112 | (file->f_flags & O_TRUNC)) |
1113 | cleanup_all_probes(); |
1114 | |
1115 | return seq_open(file, &probes_seq_op); |
1116 | } |
1117 | |
1118 | static int command_trace_probe(const char *buf) |
1119 | { |
1120 | char **argv; |
1121 | int argc = 0, ret = 0; |
1122 | |
1123 | argv = argv_split(GFP_KERNEL, buf, &argc); |
1124 | if (!argv) |
1125 | return -ENOMEM; |
1126 | |
1127 | if (argc) |
1128 | ret = create_trace_probe(argc, argv); |
1129 | |
1130 | argv_free(argv); |
1131 | return ret; |
1132 | } |
1133 | |
1134 | #define WRITE_BUFSIZE 128 |
1135 | |
1136 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
1137 | size_t count, loff_t *ppos) |
1138 | { |
1139 | char *kbuf, *tmp; |
1140 | int ret; |
1141 | size_t done; |
1142 | size_t size; |
1143 | |
1144 | kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); |
1145 | if (!kbuf) |
1146 | return -ENOMEM; |
1147 | |
1148 | ret = done = 0; |
1149 | while (done < count) { |
1150 | size = count - done; |
1151 | if (size >= WRITE_BUFSIZE) |
1152 | size = WRITE_BUFSIZE - 1; |
1153 | if (copy_from_user(kbuf, buffer + done, size)) { |
1154 | ret = -EFAULT; |
1155 | goto out; |
1156 | } |
1157 | kbuf[size] = '\0'; |
1158 | tmp = strchr(kbuf, '\n'); |
1159 | if (tmp) { |
1160 | *tmp = '\0'; |
1161 | size = tmp - kbuf + 1; |
1162 | } else if (done + size < count) { |
1163 | pr_warning("Line length is too long: " |
1164 | "Should be less than %d.", WRITE_BUFSIZE); |
1165 | ret = -EINVAL; |
1166 | goto out; |
1167 | } |
1168 | done += size; |
1169 | /* Remove comments */ |
1170 | tmp = strchr(kbuf, '#'); |
1171 | if (tmp) |
1172 | *tmp = '\0'; |
1173 | |
1174 | ret = command_trace_probe(kbuf); |
1175 | if (ret) |
1176 | goto out; |
1177 | } |
1178 | ret = done; |
1179 | out: |
1180 | kfree(kbuf); |
1181 | return ret; |
1182 | } |
1183 | |
1184 | static const struct file_operations kprobe_events_ops = { |
1185 | .owner = THIS_MODULE, |
1186 | .open = probes_open, |
1187 | .read = seq_read, |
1188 | .llseek = seq_lseek, |
1189 | .release = seq_release, |
1190 | .write = probes_write, |
1191 | }; |
1192 | |
1193 | /* Probes profiling interfaces */ |
1194 | static int probes_profile_seq_show(struct seq_file *m, void *v) |
1195 | { |
1196 | struct trace_probe *tp = v; |
1197 | |
1198 | seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit, |
1199 | tp->rp.kp.nmissed); |
1200 | |
1201 | return 0; |
1202 | } |
1203 | |
1204 | static const struct seq_operations profile_seq_op = { |
1205 | .start = probes_seq_start, |
1206 | .next = probes_seq_next, |
1207 | .stop = probes_seq_stop, |
1208 | .show = probes_profile_seq_show |
1209 | }; |
1210 | |
1211 | static int profile_open(struct inode *inode, struct file *file) |
1212 | { |
1213 | return seq_open(file, &profile_seq_op); |
1214 | } |
1215 | |
1216 | static const struct file_operations kprobe_profile_ops = { |
1217 | .owner = THIS_MODULE, |
1218 | .open = profile_open, |
1219 | .read = seq_read, |
1220 | .llseek = seq_lseek, |
1221 | .release = seq_release, |
1222 | }; |
1223 | |
1224 | /* Sum up total data length for dynamic arraies (strings) */ |
1225 | static __kprobes int __get_data_size(struct trace_probe *tp, |
1226 | struct pt_regs *regs) |
1227 | { |
1228 | int i, ret = 0; |
1229 | u32 len; |
1230 | |
1231 | for (i = 0; i < tp->nr_args; i++) |
1232 | if (unlikely(tp->args[i].fetch_size.fn)) { |
1233 | call_fetch(&tp->args[i].fetch_size, regs, &len); |
1234 | ret += len; |
1235 | } |
1236 | |
1237 | return ret; |
1238 | } |
1239 | |
1240 | /* Store the value of each argument */ |
1241 | static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp, |
1242 | struct pt_regs *regs, |
1243 | u8 *data, int maxlen) |
1244 | { |
1245 | int i; |
1246 | u32 end = tp->size; |
1247 | u32 *dl; /* Data (relative) location */ |
1248 | |
1249 | for (i = 0; i < tp->nr_args; i++) { |
1250 | if (unlikely(tp->args[i].fetch_size.fn)) { |
1251 | /* |
1252 | * First, we set the relative location and |
1253 | * maximum data length to *dl |
1254 | */ |
1255 | dl = (u32 *)(data + tp->args[i].offset); |
1256 | *dl = make_data_rloc(maxlen, end - tp->args[i].offset); |
1257 | /* Then try to fetch string or dynamic array data */ |
1258 | call_fetch(&tp->args[i].fetch, regs, dl); |
1259 | /* Reduce maximum length */ |
1260 | end += get_rloc_len(*dl); |
1261 | maxlen -= get_rloc_len(*dl); |
1262 | /* Trick here, convert data_rloc to data_loc */ |
1263 | *dl = convert_rloc_to_loc(*dl, |
1264 | ent_size + tp->args[i].offset); |
1265 | } else |
1266 | /* Just fetching data normally */ |
1267 | call_fetch(&tp->args[i].fetch, regs, |
1268 | data + tp->args[i].offset); |
1269 | } |
1270 | } |
1271 | |
1272 | /* Kprobe handler */ |
1273 | static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs) |
1274 | { |
1275 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
1276 | struct kprobe_trace_entry_head *entry; |
1277 | struct ring_buffer_event *event; |
1278 | struct ring_buffer *buffer; |
1279 | int size, dsize, pc; |
1280 | unsigned long irq_flags; |
1281 | struct ftrace_event_call *call = &tp->call; |
1282 | |
1283 | tp->nhit++; |
1284 | |
1285 | local_save_flags(irq_flags); |
1286 | pc = preempt_count(); |
1287 | |
1288 | dsize = __get_data_size(tp, regs); |
1289 | size = sizeof(*entry) + tp->size + dsize; |
1290 | |
1291 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
1292 | size, irq_flags, pc); |
1293 | if (!event) |
1294 | return; |
1295 | |
1296 | entry = ring_buffer_event_data(event); |
1297 | entry->ip = (unsigned long)kp->addr; |
1298 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
1299 | |
1300 | if (!filter_current_check_discard(buffer, call, entry, event)) |
1301 | trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc); |
1302 | } |
1303 | |
1304 | /* Kretprobe handler */ |
1305 | static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri, |
1306 | struct pt_regs *regs) |
1307 | { |
1308 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
1309 | struct kretprobe_trace_entry_head *entry; |
1310 | struct ring_buffer_event *event; |
1311 | struct ring_buffer *buffer; |
1312 | int size, pc, dsize; |
1313 | unsigned long irq_flags; |
1314 | struct ftrace_event_call *call = &tp->call; |
1315 | |
1316 | local_save_flags(irq_flags); |
1317 | pc = preempt_count(); |
1318 | |
1319 | dsize = __get_data_size(tp, regs); |
1320 | size = sizeof(*entry) + tp->size + dsize; |
1321 | |
1322 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
1323 | size, irq_flags, pc); |
1324 | if (!event) |
1325 | return; |
1326 | |
1327 | entry = ring_buffer_event_data(event); |
1328 | entry->func = (unsigned long)tp->rp.kp.addr; |
1329 | entry->ret_ip = (unsigned long)ri->ret_addr; |
1330 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
1331 | |
1332 | if (!filter_current_check_discard(buffer, call, entry, event)) |
1333 | trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc); |
1334 | } |
1335 | |
1336 | /* Event entry printers */ |
1337 | enum print_line_t |
1338 | print_kprobe_event(struct trace_iterator *iter, int flags, |
1339 | struct trace_event *event) |
1340 | { |
1341 | struct kprobe_trace_entry_head *field; |
1342 | struct trace_seq *s = &iter->seq; |
1343 | struct trace_probe *tp; |
1344 | u8 *data; |
1345 | int i; |
1346 | |
1347 | field = (struct kprobe_trace_entry_head *)iter->ent; |
1348 | tp = container_of(event, struct trace_probe, call.event); |
1349 | |
1350 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
1351 | goto partial; |
1352 | |
1353 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
1354 | goto partial; |
1355 | |
1356 | if (!trace_seq_puts(s, ")")) |
1357 | goto partial; |
1358 | |
1359 | data = (u8 *)&field[1]; |
1360 | for (i = 0; i < tp->nr_args; i++) |
1361 | if (!tp->args[i].type->print(s, tp->args[i].name, |
1362 | data + tp->args[i].offset, field)) |
1363 | goto partial; |
1364 | |
1365 | if (!trace_seq_puts(s, "\n")) |
1366 | goto partial; |
1367 | |
1368 | return TRACE_TYPE_HANDLED; |
1369 | partial: |
1370 | return TRACE_TYPE_PARTIAL_LINE; |
1371 | } |
1372 | |
1373 | enum print_line_t |
1374 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
1375 | struct trace_event *event) |
1376 | { |
1377 | struct kretprobe_trace_entry_head *field; |
1378 | struct trace_seq *s = &iter->seq; |
1379 | struct trace_probe *tp; |
1380 | u8 *data; |
1381 | int i; |
1382 | |
1383 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
1384 | tp = container_of(event, struct trace_probe, call.event); |
1385 | |
1386 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
1387 | goto partial; |
1388 | |
1389 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
1390 | goto partial; |
1391 | |
1392 | if (!trace_seq_puts(s, " <- ")) |
1393 | goto partial; |
1394 | |
1395 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) |
1396 | goto partial; |
1397 | |
1398 | if (!trace_seq_puts(s, ")")) |
1399 | goto partial; |
1400 | |
1401 | data = (u8 *)&field[1]; |
1402 | for (i = 0; i < tp->nr_args; i++) |
1403 | if (!tp->args[i].type->print(s, tp->args[i].name, |
1404 | data + tp->args[i].offset, field)) |
1405 | goto partial; |
1406 | |
1407 | if (!trace_seq_puts(s, "\n")) |
1408 | goto partial; |
1409 | |
1410 | return TRACE_TYPE_HANDLED; |
1411 | partial: |
1412 | return TRACE_TYPE_PARTIAL_LINE; |
1413 | } |
1414 | |
1415 | static int probe_event_enable(struct ftrace_event_call *call) |
1416 | { |
1417 | struct trace_probe *tp = (struct trace_probe *)call->data; |
1418 | |
1419 | tp->flags |= TP_FLAG_TRACE; |
1420 | if (probe_is_return(tp)) |
1421 | return enable_kretprobe(&tp->rp); |
1422 | else |
1423 | return enable_kprobe(&tp->rp.kp); |
1424 | } |
1425 | |
1426 | static void probe_event_disable(struct ftrace_event_call *call) |
1427 | { |
1428 | struct trace_probe *tp = (struct trace_probe *)call->data; |
1429 | |
1430 | tp->flags &= ~TP_FLAG_TRACE; |
1431 | if (!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE))) { |
1432 | if (probe_is_return(tp)) |
1433 | disable_kretprobe(&tp->rp); |
1434 | else |
1435 | disable_kprobe(&tp->rp.kp); |
1436 | } |
1437 | } |
1438 | |
1439 | #undef DEFINE_FIELD |
1440 | #define DEFINE_FIELD(type, item, name, is_signed) \ |
1441 | do { \ |
1442 | ret = trace_define_field(event_call, #type, name, \ |
1443 | offsetof(typeof(field), item), \ |
1444 | sizeof(field.item), is_signed, \ |
1445 | FILTER_OTHER); \ |
1446 | if (ret) \ |
1447 | return ret; \ |
1448 | } while (0) |
1449 | |
1450 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) |
1451 | { |
1452 | int ret, i; |
1453 | struct kprobe_trace_entry_head field; |
1454 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
1455 | |
1456 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
1457 | /* Set argument names as fields */ |
1458 | for (i = 0; i < tp->nr_args; i++) { |
1459 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
1460 | tp->args[i].name, |
1461 | sizeof(field) + tp->args[i].offset, |
1462 | tp->args[i].type->size, |
1463 | tp->args[i].type->is_signed, |
1464 | FILTER_OTHER); |
1465 | if (ret) |
1466 | return ret; |
1467 | } |
1468 | return 0; |
1469 | } |
1470 | |
1471 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) |
1472 | { |
1473 | int ret, i; |
1474 | struct kretprobe_trace_entry_head field; |
1475 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
1476 | |
1477 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
1478 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); |
1479 | /* Set argument names as fields */ |
1480 | for (i = 0; i < tp->nr_args; i++) { |
1481 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
1482 | tp->args[i].name, |
1483 | sizeof(field) + tp->args[i].offset, |
1484 | tp->args[i].type->size, |
1485 | tp->args[i].type->is_signed, |
1486 | FILTER_OTHER); |
1487 | if (ret) |
1488 | return ret; |
1489 | } |
1490 | return 0; |
1491 | } |
1492 | |
1493 | static int __set_print_fmt(struct trace_probe *tp, char *buf, int len) |
1494 | { |
1495 | int i; |
1496 | int pos = 0; |
1497 | |
1498 | const char *fmt, *arg; |
1499 | |
1500 | if (!probe_is_return(tp)) { |
1501 | fmt = "(%lx)"; |
1502 | arg = "REC->" FIELD_STRING_IP; |
1503 | } else { |
1504 | fmt = "(%lx <- %lx)"; |
1505 | arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP; |
1506 | } |
1507 | |
1508 | /* When len=0, we just calculate the needed length */ |
1509 | #define LEN_OR_ZERO (len ? len - pos : 0) |
1510 | |
1511 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt); |
1512 | |
1513 | for (i = 0; i < tp->nr_args; i++) { |
1514 | pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s", |
1515 | tp->args[i].name, tp->args[i].type->fmt); |
1516 | } |
1517 | |
1518 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg); |
1519 | |
1520 | for (i = 0; i < tp->nr_args; i++) { |
1521 | if (strcmp(tp->args[i].type->name, "string") == 0) |
1522 | pos += snprintf(buf + pos, LEN_OR_ZERO, |
1523 | ", __get_str(%s)", |
1524 | tp->args[i].name); |
1525 | else |
1526 | pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s", |
1527 | tp->args[i].name); |
1528 | } |
1529 | |
1530 | #undef LEN_OR_ZERO |
1531 | |
1532 | /* return the length of print_fmt */ |
1533 | return pos; |
1534 | } |
1535 | |
1536 | static int set_print_fmt(struct trace_probe *tp) |
1537 | { |
1538 | int len; |
1539 | char *print_fmt; |
1540 | |
1541 | /* First: called with 0 length to calculate the needed length */ |
1542 | len = __set_print_fmt(tp, NULL, 0); |
1543 | print_fmt = kmalloc(len + 1, GFP_KERNEL); |
1544 | if (!print_fmt) |
1545 | return -ENOMEM; |
1546 | |
1547 | /* Second: actually write the @print_fmt */ |
1548 | __set_print_fmt(tp, print_fmt, len + 1); |
1549 | tp->call.print_fmt = print_fmt; |
1550 | |
1551 | return 0; |
1552 | } |
1553 | |
1554 | #ifdef CONFIG_PERF_EVENTS |
1555 | |
1556 | /* Kprobe profile handler */ |
1557 | static __kprobes void kprobe_perf_func(struct kprobe *kp, |
1558 | struct pt_regs *regs) |
1559 | { |
1560 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
1561 | struct ftrace_event_call *call = &tp->call; |
1562 | struct kprobe_trace_entry_head *entry; |
1563 | struct hlist_head *head; |
1564 | int size, __size, dsize; |
1565 | int rctx; |
1566 | |
1567 | dsize = __get_data_size(tp, regs); |
1568 | __size = sizeof(*entry) + tp->size + dsize; |
1569 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1570 | size -= sizeof(u32); |
1571 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
1572 | "profile buffer not large enough")) |
1573 | return; |
1574 | |
1575 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
1576 | if (!entry) |
1577 | return; |
1578 | |
1579 | entry->ip = (unsigned long)kp->addr; |
1580 | memset(&entry[1], 0, dsize); |
1581 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
1582 | |
1583 | head = this_cpu_ptr(call->perf_events); |
1584 | perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head); |
1585 | } |
1586 | |
1587 | /* Kretprobe profile handler */ |
1588 | static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri, |
1589 | struct pt_regs *regs) |
1590 | { |
1591 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
1592 | struct ftrace_event_call *call = &tp->call; |
1593 | struct kretprobe_trace_entry_head *entry; |
1594 | struct hlist_head *head; |
1595 | int size, __size, dsize; |
1596 | int rctx; |
1597 | |
1598 | dsize = __get_data_size(tp, regs); |
1599 | __size = sizeof(*entry) + tp->size + dsize; |
1600 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
1601 | size -= sizeof(u32); |
1602 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
1603 | "profile buffer not large enough")) |
1604 | return; |
1605 | |
1606 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
1607 | if (!entry) |
1608 | return; |
1609 | |
1610 | entry->func = (unsigned long)tp->rp.kp.addr; |
1611 | entry->ret_ip = (unsigned long)ri->ret_addr; |
1612 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
1613 | |
1614 | head = this_cpu_ptr(call->perf_events); |
1615 | perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head); |
1616 | } |
1617 | |
1618 | static int probe_perf_enable(struct ftrace_event_call *call) |
1619 | { |
1620 | struct trace_probe *tp = (struct trace_probe *)call->data; |
1621 | |
1622 | tp->flags |= TP_FLAG_PROFILE; |
1623 | |
1624 | if (probe_is_return(tp)) |
1625 | return enable_kretprobe(&tp->rp); |
1626 | else |
1627 | return enable_kprobe(&tp->rp.kp); |
1628 | } |
1629 | |
1630 | static void probe_perf_disable(struct ftrace_event_call *call) |
1631 | { |
1632 | struct trace_probe *tp = (struct trace_probe *)call->data; |
1633 | |
1634 | tp->flags &= ~TP_FLAG_PROFILE; |
1635 | |
1636 | if (!(tp->flags & TP_FLAG_TRACE)) { |
1637 | if (probe_is_return(tp)) |
1638 | disable_kretprobe(&tp->rp); |
1639 | else |
1640 | disable_kprobe(&tp->rp.kp); |
1641 | } |
1642 | } |
1643 | #endif /* CONFIG_PERF_EVENTS */ |
1644 | |
1645 | static __kprobes |
1646 | int kprobe_register(struct ftrace_event_call *event, enum trace_reg type) |
1647 | { |
1648 | switch (type) { |
1649 | case TRACE_REG_REGISTER: |
1650 | return probe_event_enable(event); |
1651 | case TRACE_REG_UNREGISTER: |
1652 | probe_event_disable(event); |
1653 | return 0; |
1654 | |
1655 | #ifdef CONFIG_PERF_EVENTS |
1656 | case TRACE_REG_PERF_REGISTER: |
1657 | return probe_perf_enable(event); |
1658 | case TRACE_REG_PERF_UNREGISTER: |
1659 | probe_perf_disable(event); |
1660 | return 0; |
1661 | #endif |
1662 | } |
1663 | return 0; |
1664 | } |
1665 | |
1666 | static __kprobes |
1667 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
1668 | { |
1669 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
1670 | |
1671 | if (tp->flags & TP_FLAG_TRACE) |
1672 | kprobe_trace_func(kp, regs); |
1673 | #ifdef CONFIG_PERF_EVENTS |
1674 | if (tp->flags & TP_FLAG_PROFILE) |
1675 | kprobe_perf_func(kp, regs); |
1676 | #endif |
1677 | return 0; /* We don't tweek kernel, so just return 0 */ |
1678 | } |
1679 | |
1680 | static __kprobes |
1681 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) |
1682 | { |
1683 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
1684 | |
1685 | if (tp->flags & TP_FLAG_TRACE) |
1686 | kretprobe_trace_func(ri, regs); |
1687 | #ifdef CONFIG_PERF_EVENTS |
1688 | if (tp->flags & TP_FLAG_PROFILE) |
1689 | kretprobe_perf_func(ri, regs); |
1690 | #endif |
1691 | return 0; /* We don't tweek kernel, so just return 0 */ |
1692 | } |
1693 | |
1694 | static struct trace_event_functions kretprobe_funcs = { |
1695 | .trace = print_kretprobe_event |
1696 | }; |
1697 | |
1698 | static struct trace_event_functions kprobe_funcs = { |
1699 | .trace = print_kprobe_event |
1700 | }; |
1701 | |
1702 | static int register_probe_event(struct trace_probe *tp) |
1703 | { |
1704 | struct ftrace_event_call *call = &tp->call; |
1705 | int ret; |
1706 | |
1707 | /* Initialize ftrace_event_call */ |
1708 | INIT_LIST_HEAD(&call->class->fields); |
1709 | if (probe_is_return(tp)) { |
1710 | call->event.funcs = &kretprobe_funcs; |
1711 | call->class->define_fields = kretprobe_event_define_fields; |
1712 | } else { |
1713 | call->event.funcs = &kprobe_funcs; |
1714 | call->class->define_fields = kprobe_event_define_fields; |
1715 | } |
1716 | if (set_print_fmt(tp) < 0) |
1717 | return -ENOMEM; |
1718 | ret = register_ftrace_event(&call->event); |
1719 | if (!ret) { |
1720 | kfree(call->print_fmt); |
1721 | return -ENODEV; |
1722 | } |
1723 | call->flags = 0; |
1724 | call->class->reg = kprobe_register; |
1725 | call->data = tp; |
1726 | ret = trace_add_event_call(call); |
1727 | if (ret) { |
1728 | pr_info("Failed to register kprobe event: %s\n", call->name); |
1729 | kfree(call->print_fmt); |
1730 | unregister_ftrace_event(&call->event); |
1731 | } |
1732 | return ret; |
1733 | } |
1734 | |
1735 | static void unregister_probe_event(struct trace_probe *tp) |
1736 | { |
1737 | /* tp->event is unregistered in trace_remove_event_call() */ |
1738 | trace_remove_event_call(&tp->call); |
1739 | kfree(tp->call.print_fmt); |
1740 | } |
1741 | |
1742 | /* Make a debugfs interface for controling probe points */ |
1743 | static __init int init_kprobe_trace(void) |
1744 | { |
1745 | struct dentry *d_tracer; |
1746 | struct dentry *entry; |
1747 | |
1748 | d_tracer = tracing_init_dentry(); |
1749 | if (!d_tracer) |
1750 | return 0; |
1751 | |
1752 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, |
1753 | NULL, &kprobe_events_ops); |
1754 | |
1755 | /* Event list interface */ |
1756 | if (!entry) |
1757 | pr_warning("Could not create debugfs " |
1758 | "'kprobe_events' entry\n"); |
1759 | |
1760 | /* Profile interface */ |
1761 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, |
1762 | NULL, &kprobe_profile_ops); |
1763 | |
1764 | if (!entry) |
1765 | pr_warning("Could not create debugfs " |
1766 | "'kprobe_profile' entry\n"); |
1767 | return 0; |
1768 | } |
1769 | fs_initcall(init_kprobe_trace); |
1770 | |
1771 | |
1772 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
1773 | |
1774 | static int kprobe_trace_selftest_target(int a1, int a2, int a3, |
1775 | int a4, int a5, int a6) |
1776 | { |
1777 | return a1 + a2 + a3 + a4 + a5 + a6; |
1778 | } |
1779 | |
1780 | static __init int kprobe_trace_self_tests_init(void) |
1781 | { |
1782 | int ret, warn = 0; |
1783 | int (*target)(int, int, int, int, int, int); |
1784 | struct trace_probe *tp; |
1785 | |
1786 | target = kprobe_trace_selftest_target; |
1787 | |
1788 | pr_info("Testing kprobe tracing: "); |
1789 | |
1790 | ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target " |
1791 | "$stack $stack0 +0($stack)"); |
1792 | if (WARN_ON_ONCE(ret)) { |
1793 | pr_warning("error on probing function entry.\n"); |
1794 | warn++; |
1795 | } else { |
1796 | /* Enable trace point */ |
1797 | tp = find_probe_event("testprobe", KPROBE_EVENT_SYSTEM); |
1798 | if (WARN_ON_ONCE(tp == NULL)) { |
1799 | pr_warning("error on getting new probe.\n"); |
1800 | warn++; |
1801 | } else |
1802 | probe_event_enable(&tp->call); |
1803 | } |
1804 | |
1805 | ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target " |
1806 | "$retval"); |
1807 | if (WARN_ON_ONCE(ret)) { |
1808 | pr_warning("error on probing function return.\n"); |
1809 | warn++; |
1810 | } else { |
1811 | /* Enable trace point */ |
1812 | tp = find_probe_event("testprobe2", KPROBE_EVENT_SYSTEM); |
1813 | if (WARN_ON_ONCE(tp == NULL)) { |
1814 | pr_warning("error on getting new probe.\n"); |
1815 | warn++; |
1816 | } else |
1817 | probe_event_enable(&tp->call); |
1818 | } |
1819 | |
1820 | if (warn) |
1821 | goto end; |
1822 | |
1823 | ret = target(1, 2, 3, 4, 5, 6); |
1824 | |
1825 | ret = command_trace_probe("-:testprobe"); |
1826 | if (WARN_ON_ONCE(ret)) { |
1827 | pr_warning("error on deleting a probe.\n"); |
1828 | warn++; |
1829 | } |
1830 | |
1831 | ret = command_trace_probe("-:testprobe2"); |
1832 | if (WARN_ON_ONCE(ret)) { |
1833 | pr_warning("error on deleting a probe.\n"); |
1834 | warn++; |
1835 | } |
1836 | |
1837 | end: |
1838 | cleanup_all_probes(); |
1839 | if (warn) |
1840 | pr_cont("NG: Some tests are failed. Please check them.\n"); |
1841 | else |
1842 | pr_cont("OK\n"); |
1843 | return 0; |
1844 | } |
1845 | |
1846 | late_initcall(kprobe_trace_self_tests_init); |
1847 | |
1848 | #endif |
1849 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9