blob: 00d527c945a4ceec13f8633ec6a5bf8be4c1debb [file] [log] [blame]
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001/*
Masami Hiramatsu77b44d12009-11-03 19:12:47 -05002 * Kprobes-based tracing events
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04003 *
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>
Frederic Weisbeckerd7a4b412009-09-23 23:08:43 +020031#include <linux/perf_event.h>
Masami Hiramatsu93ccae72010-04-12 13:17:08 -040032#include <linux/stringify.h>
Masami Hiramatsue09c8612010-07-05 15:54:45 -030033#include <linux/limits.h>
Masami Hiramatsu93ccae72010-04-12 13:17:08 -040034#include <asm/bitsperlong.h>
Masami Hiramatsu413d37d2009-08-13 16:35:11 -040035
36#include "trace.h"
37#include "trace_output.h"
38
Masami Hiramatsua82378d2009-08-13 16:35:18 -040039#define MAX_TRACE_ARGS 128
Masami Hiramatsu413d37d2009-08-13 16:35:11 -040040#define MAX_ARGSTR_LEN 63
Masami Hiramatsu42635652009-08-13 16:35:26 -040041#define MAX_EVENT_NAME_LEN 64
Masami Hiramatsue09c8612010-07-05 15:54:45 -030042#define MAX_STRING_SIZE PATH_MAX
Masami Hiramatsuf52487e2009-09-10 19:53:53 -040043#define KPROBE_EVENT_SYSTEM "kprobes"
Masami Hiramatsu413d37d2009-08-13 16:35:11 -040044
Masami Hiramatsua703d942009-10-07 18:28:07 -040045/* Reserved field names */
Masami Hiramatsue93f4d82009-10-07 18:28:14 -040046#define FIELD_STRING_IP "__probe_ip"
Masami Hiramatsue93f4d82009-10-07 18:28:14 -040047#define FIELD_STRING_RETIP "__probe_ret_ip"
48#define FIELD_STRING_FUNC "__probe_func"
Masami Hiramatsua703d942009-10-07 18:28:07 -040049
50const char *reserved_field_names[] = {
51 "common_type",
52 "common_flags",
53 "common_preempt_count",
54 "common_pid",
55 "common_tgid",
Masami Hiramatsua703d942009-10-07 18:28:07 -040056 FIELD_STRING_IP,
Masami Hiramatsua703d942009-10-07 18:28:07 -040057 FIELD_STRING_RETIP,
58 FIELD_STRING_FUNC,
59};
60
Masami Hiramatsu93ccae72010-04-12 13:17:08 -040061/* Printing function type */
Masami Hiramatsue09c8612010-07-05 15:54:45 -030062typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *,
63 void *);
Masami Hiramatsu93ccae72010-04-12 13:17:08 -040064#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
65#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
66
67/* Printing in basic type function template */
68#define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast) \
69static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \
Masami Hiramatsue09c8612010-07-05 15:54:45 -030070 const char *name, \
71 void *data, void *ent)\
Masami Hiramatsu93ccae72010-04-12 13:17:08 -040072{ \
73 return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
74} \
75static const char PRINT_TYPE_FMT_NAME(type)[] = fmt;
76
77DEFINE_BASIC_PRINT_TYPE_FUNC(u8, "%x", unsigned int)
78DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "%x", unsigned int)
79DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "%lx", unsigned long)
80DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "%llx", unsigned long long)
81DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d", int)
82DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
83DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
84DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
85
Masami Hiramatsue09c8612010-07-05 15:54:45 -030086/* data_rloc: data relative location, compatible with u32 */
87#define make_data_rloc(len, roffs) \
88 (((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
89#define get_rloc_len(dl) ((u32)(dl) >> 16)
90#define get_rloc_offs(dl) ((u32)(dl) & 0xffff)
91
92static inline void *get_rloc_data(u32 *dl)
93{
94 return (u8 *)dl + get_rloc_offs(*dl);
95}
96
97/* For data_loc conversion */
98static inline void *get_loc_data(u32 *dl, void *ent)
99{
100 return (u8 *)ent + get_rloc_offs(*dl);
101}
102
103/*
104 * Convert data_rloc to data_loc:
105 * data_rloc stores the offset from data_rloc itself, but data_loc
106 * stores the offset from event entry.
107 */
108#define convert_rloc_to_loc(dl, offs) ((u32)(dl) + (offs))
109
110/* For defining macros, define string/string_size types */
111typedef u32 string;
112typedef u32 string_size;
113
114/* Print type function for string type */
115static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
116 const char *name,
117 void *data, void *ent)
118{
119 int len = *(u32 *)data >> 16;
120
121 if (!len)
122 return trace_seq_printf(s, " %s=(fault)", name);
123 else
124 return trace_seq_printf(s, " %s=\"%s\"", name,
125 (const char *)get_loc_data(data, ent));
126}
127static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
128
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400129/* Data fetch function type */
130typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
131
132struct fetch_param {
133 fetch_func_t fn;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400134 void *data;
135};
136
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400137static __kprobes void call_fetch(struct fetch_param *fprm,
138 struct pt_regs *regs, void *dest)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400139{
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400140 return fprm->fn(regs, fprm->data, dest);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400141}
142
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300143#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400144/*
145 * Define macro for basic types - we don't need to define s* types, because
146 * we have to care only about bitwidth at recording time.
147 */
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300148#define DEFINE_BASIC_FETCH_FUNCS(method) \
149DEFINE_FETCH_##method(u8) \
150DEFINE_FETCH_##method(u16) \
151DEFINE_FETCH_##method(u32) \
152DEFINE_FETCH_##method(u64)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400153
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300154#define CHECK_FETCH_FUNCS(method, fn) \
155 (((FETCH_FUNC_NAME(method, u8) == fn) || \
156 (FETCH_FUNC_NAME(method, u16) == fn) || \
157 (FETCH_FUNC_NAME(method, u32) == fn) || \
158 (FETCH_FUNC_NAME(method, u64) == fn) || \
159 (FETCH_FUNC_NAME(method, string) == fn) || \
160 (FETCH_FUNC_NAME(method, string_size) == fn)) \
161 && (fn != NULL))
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400162
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400163/* Data fetch function templates */
164#define DEFINE_FETCH_reg(type) \
165static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300166 void *offset, void *dest) \
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400167{ \
168 *(type *)dest = (type)regs_get_register(regs, \
169 (unsigned int)((unsigned long)offset)); \
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400170}
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400171DEFINE_BASIC_FETCH_FUNCS(reg)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300172/* No string on the register */
173#define fetch_reg_string NULL
174#define fetch_reg_string_size NULL
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400175
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400176#define DEFINE_FETCH_stack(type) \
177static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
178 void *offset, void *dest) \
179{ \
180 *(type *)dest = (type)regs_get_kernel_stack_nth(regs, \
181 (unsigned int)((unsigned long)offset)); \
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400182}
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400183DEFINE_BASIC_FETCH_FUNCS(stack)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300184/* No string on the stack entry */
185#define fetch_stack_string NULL
186#define fetch_stack_string_size NULL
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400187
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400188#define DEFINE_FETCH_retval(type) \
189static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
190 void *dummy, void *dest) \
191{ \
192 *(type *)dest = (type)regs_return_value(regs); \
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400193}
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400194DEFINE_BASIC_FETCH_FUNCS(retval)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300195/* No string on the retval */
196#define fetch_retval_string NULL
197#define fetch_retval_string_size NULL
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400198
199#define DEFINE_FETCH_memory(type) \
200static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
201 void *addr, void *dest) \
202{ \
203 type retval; \
204 if (probe_kernel_address(addr, retval)) \
205 *(type *)dest = 0; \
206 else \
207 *(type *)dest = retval; \
208}
209DEFINE_BASIC_FETCH_FUNCS(memory)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300210/*
211 * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
212 * length and relative data location.
213 */
214static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
215 void *addr, void *dest)
216{
217 long ret;
218 int maxlen = get_rloc_len(*(u32 *)dest);
219 u8 *dst = get_rloc_data(dest);
220 u8 *src = addr;
221 mm_segment_t old_fs = get_fs();
222 if (!maxlen)
223 return;
224 /*
225 * Try to get string again, since the string can be changed while
226 * probing.
227 */
228 set_fs(KERNEL_DS);
229 pagefault_disable();
230 do
231 ret = __copy_from_user_inatomic(dst++, src++, 1);
232 while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
233 dst[-1] = '\0';
234 pagefault_enable();
235 set_fs(old_fs);
236
237 if (ret < 0) { /* Failed to fetch string */
238 ((u8 *)get_rloc_data(dest))[0] = '\0';
239 *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
240 } else
241 *(u32 *)dest = make_data_rloc(src - (u8 *)addr,
242 get_rloc_offs(*(u32 *)dest));
243}
244/* Return the length of string -- including null terminal byte */
245static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
246 void *addr, void *dest)
247{
248 int ret, len = 0;
249 u8 c;
250 mm_segment_t old_fs = get_fs();
251
252 set_fs(KERNEL_DS);
253 pagefault_disable();
254 do {
255 ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
256 len++;
257 } while (c && ret == 0 && len < MAX_STRING_SIZE);
258 pagefault_enable();
259 set_fs(old_fs);
260
261 if (ret < 0) /* Failed to check the length */
262 *(u32 *)dest = 0;
263 else
264 *(u32 *)dest = len;
265}
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400266
267/* Memory fetching by symbol */
268struct symbol_cache {
269 char *symbol;
270 long offset;
271 unsigned long addr;
272};
273
274static unsigned long update_symbol_cache(struct symbol_cache *sc)
275{
276 sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
277 if (sc->addr)
278 sc->addr += sc->offset;
279 return sc->addr;
280}
281
282static void free_symbol_cache(struct symbol_cache *sc)
283{
284 kfree(sc->symbol);
285 kfree(sc);
286}
287
288static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
289{
290 struct symbol_cache *sc;
291
292 if (!sym || strlen(sym) == 0)
293 return NULL;
294 sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
295 if (!sc)
296 return NULL;
297
298 sc->symbol = kstrdup(sym, GFP_KERNEL);
299 if (!sc->symbol) {
300 kfree(sc);
301 return NULL;
302 }
303 sc->offset = offset;
304
305 update_symbol_cache(sc);
306 return sc;
307}
308
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400309#define DEFINE_FETCH_symbol(type) \
310static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
311 void *data, void *dest) \
312{ \
313 struct symbol_cache *sc = data; \
314 if (sc->addr) \
315 fetch_memory_##type(regs, (void *)sc->addr, dest); \
316 else \
317 *(type *)dest = 0; \
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400318}
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400319DEFINE_BASIC_FETCH_FUNCS(symbol)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300320DEFINE_FETCH_symbol(string)
321DEFINE_FETCH_symbol(string_size)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400322
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400323/* Dereference memory access function */
324struct deref_fetch_param {
325 struct fetch_param orig;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400326 long offset;
327};
328
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400329#define DEFINE_FETCH_deref(type) \
330static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
331 void *data, void *dest) \
332{ \
333 struct deref_fetch_param *dprm = data; \
334 unsigned long addr; \
335 call_fetch(&dprm->orig, regs, &addr); \
336 if (addr) { \
337 addr += dprm->offset; \
338 fetch_memory_##type(regs, (void *)addr, dest); \
339 } else \
340 *(type *)dest = 0; \
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400341}
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400342DEFINE_BASIC_FETCH_FUNCS(deref)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300343DEFINE_FETCH_deref(string)
344DEFINE_FETCH_deref(string_size)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400345
Masami Hiramatsu7f6878a2011-06-27 16:27:03 +0900346static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data)
347{
348 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
349 update_deref_fetch_param(data->orig.data);
350 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
351 update_symbol_cache(data->orig.data);
352}
353
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400354static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400355{
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300356 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400357 free_deref_fetch_param(data->orig.data);
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300358 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400359 free_symbol_cache(data->orig.data);
360 kfree(data);
361}
362
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900363/* Bitfield fetch function */
364struct bitfield_fetch_param {
365 struct fetch_param orig;
366 unsigned char hi_shift;
367 unsigned char low_shift;
368};
369
370#define DEFINE_FETCH_bitfield(type) \
371static __kprobes void FETCH_FUNC_NAME(bitfield, type)(struct pt_regs *regs,\
372 void *data, void *dest) \
373{ \
374 struct bitfield_fetch_param *bprm = data; \
375 type buf = 0; \
376 call_fetch(&bprm->orig, regs, &buf); \
377 if (buf) { \
378 buf <<= bprm->hi_shift; \
379 buf >>= bprm->low_shift; \
380 } \
381 *(type *)dest = buf; \
382}
383DEFINE_BASIC_FETCH_FUNCS(bitfield)
384#define fetch_bitfield_string NULL
385#define fetch_bitfield_string_size NULL
386
387static __kprobes void
Masami Hiramatsu7f6878a2011-06-27 16:27:03 +0900388update_bitfield_fetch_param(struct bitfield_fetch_param *data)
389{
390 /*
391 * Don't check the bitfield itself, because this must be the
392 * last fetch function.
393 */
394 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
395 update_deref_fetch_param(data->orig.data);
396 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
397 update_symbol_cache(data->orig.data);
398}
399
400static __kprobes void
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900401free_bitfield_fetch_param(struct bitfield_fetch_param *data)
402{
403 /*
404 * Don't check the bitfield itself, because this must be the
405 * last fetch function.
406 */
407 if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
408 free_deref_fetch_param(data->orig.data);
409 else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
410 free_symbol_cache(data->orig.data);
411 kfree(data);
412}
Masami Hiramatsu7f6878a2011-06-27 16:27:03 +0900413
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400414/* Default (unsigned long) fetch type */
415#define __DEFAULT_FETCH_TYPE(t) u##t
416#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
417#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
418#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
419
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300420/* Fetch types */
421enum {
422 FETCH_MTD_reg = 0,
423 FETCH_MTD_stack,
424 FETCH_MTD_retval,
425 FETCH_MTD_memory,
426 FETCH_MTD_symbol,
427 FETCH_MTD_deref,
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900428 FETCH_MTD_bitfield,
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300429 FETCH_MTD_END,
430};
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400431
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300432#define ASSIGN_FETCH_FUNC(method, type) \
433 [FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
434
435#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
436 {.name = _name, \
437 .size = _size, \
438 .is_signed = sign, \
439 .print = PRINT_TYPE_FUNC_NAME(ptype), \
440 .fmt = PRINT_TYPE_FMT_NAME(ptype), \
441 .fmttype = _fmttype, \
442 .fetch = { \
443ASSIGN_FETCH_FUNC(reg, ftype), \
444ASSIGN_FETCH_FUNC(stack, ftype), \
445ASSIGN_FETCH_FUNC(retval, ftype), \
446ASSIGN_FETCH_FUNC(memory, ftype), \
447ASSIGN_FETCH_FUNC(symbol, ftype), \
448ASSIGN_FETCH_FUNC(deref, ftype), \
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900449ASSIGN_FETCH_FUNC(bitfield, ftype), \
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300450 } \
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400451 }
452
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300453#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
454 __ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
455
456#define FETCH_TYPE_STRING 0
457#define FETCH_TYPE_STRSIZE 1
458
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400459/* Fetch type information table */
460static const struct fetch_type {
461 const char *name; /* Name of type */
462 size_t size; /* Byte size of type */
463 int is_signed; /* Signed flag */
464 print_type_func_t print; /* Print functions */
465 const char *fmt; /* Fromat string */
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300466 const char *fmttype; /* Name in format file */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400467 /* Fetch functions */
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300468 fetch_func_t fetch[FETCH_MTD_END];
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400469} fetch_type_table[] = {
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300470 /* Special types */
471 [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
472 sizeof(u32), 1, "__data_loc char[]"),
473 [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
474 string_size, sizeof(u32), 0, "u32"),
475 /* Basic types */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400476 ASSIGN_FETCH_TYPE(u8, u8, 0),
477 ASSIGN_FETCH_TYPE(u16, u16, 0),
478 ASSIGN_FETCH_TYPE(u32, u32, 0),
479 ASSIGN_FETCH_TYPE(u64, u64, 0),
480 ASSIGN_FETCH_TYPE(s8, u8, 1),
481 ASSIGN_FETCH_TYPE(s16, u16, 1),
482 ASSIGN_FETCH_TYPE(s32, u32, 1),
483 ASSIGN_FETCH_TYPE(s64, u64, 1),
484};
485
486static const struct fetch_type *find_fetch_type(const char *type)
487{
488 int i;
489
490 if (!type)
491 type = DEFAULT_FETCH_TYPE_STR;
492
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900493 /* Special case: bitfield */
494 if (*type == 'b') {
495 unsigned long bs;
496 type = strchr(type, '/');
497 if (!type)
498 goto fail;
499 type++;
500 if (strict_strtoul(type, 0, &bs))
501 goto fail;
502 switch (bs) {
503 case 8:
504 return find_fetch_type("u8");
505 case 16:
506 return find_fetch_type("u16");
507 case 32:
508 return find_fetch_type("u32");
509 case 64:
510 return find_fetch_type("u64");
511 default:
512 goto fail;
513 }
514 }
515
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400516 for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
517 if (strcmp(type, fetch_type_table[i].name) == 0)
518 return &fetch_type_table[i];
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900519fail:
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400520 return NULL;
521}
522
523/* Special function : only accept unsigned long */
524static __kprobes void fetch_stack_address(struct pt_regs *regs,
525 void *dummy, void *dest)
526{
527 *(unsigned long *)dest = kernel_stack_pointer(regs);
528}
529
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300530static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
531 fetch_func_t orig_fn)
532{
533 int i;
534
535 if (type != &fetch_type_table[FETCH_TYPE_STRING])
536 return NULL; /* Only string type needs size function */
537 for (i = 0; i < FETCH_MTD_END; i++)
538 if (type->fetch[i] == orig_fn)
539 return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
540
541 WARN_ON(1); /* This should not happen */
542 return NULL;
543}
544
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400545/**
Masami Hiramatsu77b44d12009-11-03 19:12:47 -0500546 * Kprobe event core functions
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400547 */
548
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400549struct probe_arg {
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400550 struct fetch_param fetch;
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300551 struct fetch_param fetch_size;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400552 unsigned int offset; /* Offset from argument entry */
553 const char *name; /* Name of this argument */
554 const char *comm; /* Command of this argument */
555 const struct fetch_type *type; /* Type of this argument */
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400556};
557
Masami Hiramatsu50d78052009-09-14 16:49:20 -0400558/* Flags for trace_probe */
559#define TP_FLAG_TRACE 1
560#define TP_FLAG_PROFILE 2
Masami Hiramatsu61424312011-06-27 16:26:56 +0900561#define TP_FLAG_REGISTERED 4
Masami Hiramatsu50d78052009-09-14 16:49:20 -0400562
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400563struct trace_probe {
564 struct list_head list;
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200565 struct kretprobe rp; /* Use rp.kp for kprobe use */
Masami Hiramatsucd7e7bd2009-08-13 16:35:42 -0400566 unsigned long nhit;
Masami Hiramatsu50d78052009-09-14 16:49:20 -0400567 unsigned int flags; /* For TP_FLAG_* */
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400568 const char *symbol; /* symbol name */
Steven Rostedt22392912010-04-21 12:27:06 -0400569 struct ftrace_event_class class;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400570 struct ftrace_event_call call;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400571 ssize_t size; /* trace entry size */
Masami Hiramatsua82378d2009-08-13 16:35:18 -0400572 unsigned int nr_args;
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400573 struct probe_arg args[];
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400574};
575
Masami Hiramatsua82378d2009-08-13 16:35:18 -0400576#define SIZEOF_TRACE_PROBE(n) \
577 (offsetof(struct trace_probe, args) + \
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400578 (sizeof(struct probe_arg) * (n)))
Masami Hiramatsua82378d2009-08-13 16:35:18 -0400579
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400580
Masami Hiramatsu7143f162011-06-27 16:26:36 +0900581static __kprobes int trace_probe_is_return(struct trace_probe *tp)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400582{
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200583 return tp->rp.handler != NULL;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400584}
585
Masami Hiramatsu7143f162011-06-27 16:26:36 +0900586static __kprobes const char *trace_probe_symbol(struct trace_probe *tp)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400587{
588 return tp->symbol ? tp->symbol : "unknown";
589}
590
Masami Hiramatsu61424312011-06-27 16:26:56 +0900591static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp)
592{
593 return tp->rp.kp.offset;
594}
595
596static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp)
597{
598 return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
599}
600
601static __kprobes bool trace_probe_is_registered(struct trace_probe *tp)
602{
603 return !!(tp->flags & TP_FLAG_REGISTERED);
604}
605
606static __kprobes bool trace_probe_has_gone(struct trace_probe *tp)
607{
608 return !!(kprobe_gone(&tp->rp.kp));
609}
610
611static __kprobes bool trace_probe_within_module(struct trace_probe *tp,
612 struct module *mod)
613{
614 int len = strlen(mod->name);
615 const char *name = trace_probe_symbol(tp);
616 return strncmp(mod->name, name, len) == 0 && name[len] == ':';
617}
618
619static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp)
620{
621 return !!strchr(trace_probe_symbol(tp), ':');
622}
623
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400624static int register_probe_event(struct trace_probe *tp);
625static void unregister_probe_event(struct trace_probe *tp);
626
627static DEFINE_MUTEX(probe_lock);
628static LIST_HEAD(probe_list);
629
Masami Hiramatsu50d78052009-09-14 16:49:20 -0400630static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
631static int kretprobe_dispatcher(struct kretprobe_instance *ri,
632 struct pt_regs *regs);
633
Masami Hiramatsuda346342010-08-27 20:39:12 +0900634/* Check the name is good for event/group/fields */
635static int is_good_name(const char *name)
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500636{
637 if (!isalpha(*name) && *name != '_')
638 return 0;
639 while (*++name != '\0') {
640 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
641 return 0;
642 }
643 return 1;
644}
645
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200646/*
647 * Allocate new trace_probe and initialize it (including kprobes).
648 */
Masami Hiramatsuf52487e2009-09-10 19:53:53 -0400649static struct trace_probe *alloc_trace_probe(const char *group,
650 const char *event,
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200651 void *addr,
652 const char *symbol,
653 unsigned long offs,
654 int nargs, int is_return)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400655{
656 struct trace_probe *tp;
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500657 int ret = -ENOMEM;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400658
Masami Hiramatsua82378d2009-08-13 16:35:18 -0400659 tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400660 if (!tp)
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500661 return ERR_PTR(ret);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400662
663 if (symbol) {
664 tp->symbol = kstrdup(symbol, GFP_KERNEL);
665 if (!tp->symbol)
666 goto error;
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200667 tp->rp.kp.symbol_name = tp->symbol;
668 tp->rp.kp.offset = offs;
669 } else
670 tp->rp.kp.addr = addr;
671
672 if (is_return)
Masami Hiramatsu50d78052009-09-14 16:49:20 -0400673 tp->rp.handler = kretprobe_dispatcher;
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200674 else
Masami Hiramatsu50d78052009-09-14 16:49:20 -0400675 tp->rp.kp.pre_handler = kprobe_dispatcher;
Masami Hiramatsu4a846b42009-09-11 05:31:21 +0200676
Masami Hiramatsuda346342010-08-27 20:39:12 +0900677 if (!event || !is_good_name(event)) {
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500678 ret = -EINVAL;
Masami Hiramatsu42635652009-08-13 16:35:26 -0400679 goto error;
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500680 }
681
Steven Rostedt22392912010-04-21 12:27:06 -0400682 tp->call.class = &tp->class;
Masami Hiramatsu42635652009-08-13 16:35:26 -0400683 tp->call.name = kstrdup(event, GFP_KERNEL);
684 if (!tp->call.name)
685 goto error;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400686
Masami Hiramatsuda346342010-08-27 20:39:12 +0900687 if (!group || !is_good_name(group)) {
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500688 ret = -EINVAL;
Masami Hiramatsuf52487e2009-09-10 19:53:53 -0400689 goto error;
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500690 }
691
Steven Rostedt22392912010-04-21 12:27:06 -0400692 tp->class.system = kstrdup(group, GFP_KERNEL);
693 if (!tp->class.system)
Masami Hiramatsuf52487e2009-09-10 19:53:53 -0400694 goto error;
695
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400696 INIT_LIST_HEAD(&tp->list);
697 return tp;
698error:
Masami Hiramatsuf52487e2009-09-10 19:53:53 -0400699 kfree(tp->call.name);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400700 kfree(tp->symbol);
701 kfree(tp);
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -0500702 return ERR_PTR(ret);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400703}
704
Masami Hiramatsu7f6878a2011-06-27 16:27:03 +0900705static void update_probe_arg(struct probe_arg *arg)
706{
707 if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
708 update_bitfield_fetch_param(arg->fetch.data);
709 else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
710 update_deref_fetch_param(arg->fetch.data);
711 else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
712 update_symbol_cache(arg->fetch.data);
713}
714
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400715static void free_probe_arg(struct probe_arg *arg)
716{
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +0900717 if (CHECK_FETCH_FUNCS(bitfield, arg->fetch.fn))
718 free_bitfield_fetch_param(arg->fetch.data);
719 else if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400720 free_deref_fetch_param(arg->fetch.data);
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300721 else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400722 free_symbol_cache(arg->fetch.data);
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400723 kfree(arg->name);
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400724 kfree(arg->comm);
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400725}
726
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400727static void free_trace_probe(struct trace_probe *tp)
728{
729 int i;
730
731 for (i = 0; i < tp->nr_args; i++)
Masami Hiramatsueca0d912009-09-10 19:53:38 -0400732 free_probe_arg(&tp->args[i]);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400733
Steven Rostedt8f082012010-04-20 10:47:33 -0400734 kfree(tp->call.class->system);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400735 kfree(tp->call.name);
736 kfree(tp->symbol);
737 kfree(tp);
738}
739
Masami Hiramatsu7143f162011-06-27 16:26:36 +0900740static struct trace_probe *find_trace_probe(const char *event,
Masami Hiramatsudd004c42009-10-27 16:42:44 -0400741 const char *group)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400742{
743 struct trace_probe *tp;
744
745 list_for_each_entry(tp, &probe_list, list)
Masami Hiramatsudd004c42009-10-27 16:42:44 -0400746 if (strcmp(tp->call.name, event) == 0 &&
Steven Rostedt8f082012010-04-20 10:47:33 -0400747 strcmp(tp->call.class->system, group) == 0)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400748 return tp;
749 return NULL;
750}
751
Masami Hiramatsu1538f882011-06-27 16:26:44 +0900752/* Enable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */
753static int enable_trace_probe(struct trace_probe *tp, int flag)
754{
755 int ret = 0;
756
757 tp->flags |= flag;
Masami Hiramatsu61424312011-06-27 16:26:56 +0900758 if (trace_probe_is_enabled(tp) && trace_probe_is_registered(tp) &&
759 !trace_probe_has_gone(tp)) {
Masami Hiramatsu1538f882011-06-27 16:26:44 +0900760 if (trace_probe_is_return(tp))
761 ret = enable_kretprobe(&tp->rp);
762 else
763 ret = enable_kprobe(&tp->rp.kp);
764 }
765
766 return ret;
767}
768
769/* Disable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */
770static void disable_trace_probe(struct trace_probe *tp, int flag)
771{
772 tp->flags &= ~flag;
Masami Hiramatsu61424312011-06-27 16:26:56 +0900773 if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) {
Masami Hiramatsu1538f882011-06-27 16:26:44 +0900774 if (trace_probe_is_return(tp))
775 disable_kretprobe(&tp->rp);
776 else
777 disable_kprobe(&tp->rp.kp);
778 }
779}
780
Masami Hiramatsu61424312011-06-27 16:26:56 +0900781/* Internal register function - just handle k*probes and flags */
782static int __register_trace_probe(struct trace_probe *tp)
783{
Masami Hiramatsu7f6878a2011-06-27 16:27:03 +0900784 int i, ret;
Masami Hiramatsu61424312011-06-27 16:26:56 +0900785
786 if (trace_probe_is_registered(tp))
787 return -EINVAL;
788
Masami Hiramatsu7f6878a2011-06-27 16:27:03 +0900789 for (i = 0; i < tp->nr_args; i++)
790 update_probe_arg(&tp->args[i]);
791
Masami Hiramatsu61424312011-06-27 16:26:56 +0900792 /* Set/clear disabled flag according to tp->flag */
793 if (trace_probe_is_enabled(tp))
794 tp->rp.kp.flags &= ~KPROBE_FLAG_DISABLED;
795 else
796 tp->rp.kp.flags |= KPROBE_FLAG_DISABLED;
797
798 if (trace_probe_is_return(tp))
799 ret = register_kretprobe(&tp->rp);
800 else
801 ret = register_kprobe(&tp->rp.kp);
802
803 if (ret == 0)
804 tp->flags |= TP_FLAG_REGISTERED;
805 else {
806 pr_warning("Could not insert probe at %s+%lu: %d\n",
807 trace_probe_symbol(tp), trace_probe_offset(tp), ret);
808 if (ret == -ENOENT && trace_probe_is_on_module(tp)) {
809 pr_warning("This probe might be able to register after"
810 "target module is loaded. Continue.\n");
811 ret = 0;
812 } else if (ret == -EILSEQ) {
813 pr_warning("Probing address(0x%p) is not an "
814 "instruction boundary.\n",
815 tp->rp.kp.addr);
816 ret = -EINVAL;
817 }
818 }
819
820 return ret;
821}
822
823/* Internal unregister function - just handle k*probes and flags */
824static void __unregister_trace_probe(struct trace_probe *tp)
825{
826 if (trace_probe_is_registered(tp)) {
827 if (trace_probe_is_return(tp))
828 unregister_kretprobe(&tp->rp);
829 else
830 unregister_kprobe(&tp->rp.kp);
831 tp->flags &= ~TP_FLAG_REGISTERED;
832 /* Cleanup kprobe for reuse */
833 if (tp->rp.kp.symbol_name)
834 tp->rp.kp.addr = NULL;
835 }
836}
837
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400838/* Unregister a trace_probe and probe_event: call with locking probe_lock */
Masami Hiramatsu02ca1522011-10-04 19:44:38 +0900839static int unregister_trace_probe(struct trace_probe *tp)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400840{
Masami Hiramatsu02ca1522011-10-04 19:44:38 +0900841 /* Enabled event can not be unregistered */
842 if (trace_probe_is_enabled(tp))
843 return -EBUSY;
844
Masami Hiramatsu61424312011-06-27 16:26:56 +0900845 __unregister_trace_probe(tp);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400846 list_del(&tp->list);
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400847 unregister_probe_event(tp);
Masami Hiramatsu02ca1522011-10-04 19:44:38 +0900848
849 return 0;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400850}
851
852/* Register a trace_probe and probe_event */
853static int register_trace_probe(struct trace_probe *tp)
854{
855 struct trace_probe *old_tp;
856 int ret;
857
858 mutex_lock(&probe_lock);
859
Masami Hiramatsu61424312011-06-27 16:26:56 +0900860 /* Delete old (same name) event if exist */
Masami Hiramatsu7143f162011-06-27 16:26:36 +0900861 old_tp = find_trace_probe(tp->call.name, tp->call.class->system);
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400862 if (old_tp) {
Masami Hiramatsu02ca1522011-10-04 19:44:38 +0900863 ret = unregister_trace_probe(old_tp);
864 if (ret < 0)
865 goto end;
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400866 free_trace_probe(old_tp);
867 }
Masami Hiramatsu61424312011-06-27 16:26:56 +0900868
869 /* Register new event */
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400870 ret = register_probe_event(tp);
871 if (ret) {
Paul Bolle426d3102010-08-07 12:30:03 +0200872 pr_warning("Failed to register probe event(%d)\n", ret);
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400873 goto end;
874 }
875
Masami Hiramatsu61424312011-06-27 16:26:56 +0900876 /* Register k*probe */
877 ret = __register_trace_probe(tp);
878 if (ret < 0)
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400879 unregister_probe_event(tp);
Masami Hiramatsu61424312011-06-27 16:26:56 +0900880 else
Masami Hiramatsu2d5e0672009-09-14 16:48:56 -0400881 list_add_tail(&tp->list, &probe_list);
Masami Hiramatsu61424312011-06-27 16:26:56 +0900882
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400883end:
884 mutex_unlock(&probe_lock);
885 return ret;
886}
887
Masami Hiramatsu61424312011-06-27 16:26:56 +0900888/* Module notifier call back, checking event on the module */
889static int trace_probe_module_callback(struct notifier_block *nb,
890 unsigned long val, void *data)
891{
892 struct module *mod = data;
893 struct trace_probe *tp;
894 int ret;
895
896 if (val != MODULE_STATE_COMING)
897 return NOTIFY_DONE;
898
899 /* Update probes on coming module */
900 mutex_lock(&probe_lock);
901 list_for_each_entry(tp, &probe_list, list) {
902 if (trace_probe_within_module(tp, mod)) {
Masami Hiramatsu02ca1522011-10-04 19:44:38 +0900903 /* Don't need to check busy - this should have gone. */
Masami Hiramatsu61424312011-06-27 16:26:56 +0900904 __unregister_trace_probe(tp);
905 ret = __register_trace_probe(tp);
906 if (ret)
907 pr_warning("Failed to re-register probe %s on"
908 "%s: %d\n",
909 tp->call.name, mod->name, ret);
910 }
911 }
912 mutex_unlock(&probe_lock);
913
914 return NOTIFY_DONE;
915}
916
917static struct notifier_block trace_probe_module_nb = {
918 .notifier_call = trace_probe_module_callback,
919 .priority = 1 /* Invoked after kprobe module callback */
920};
921
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400922/* Split symbol and offset. */
Masami Hiramatsu2fba0c82009-09-10 19:53:14 -0400923static int split_symbol_offset(char *symbol, unsigned long *offset)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400924{
925 char *tmp;
926 int ret;
927
928 if (!offset)
929 return -EINVAL;
930
931 tmp = strchr(symbol, '+');
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400932 if (tmp) {
933 /* skip sign because strict_strtol doesn't accept '+' */
Masami Hiramatsu2fba0c82009-09-10 19:53:14 -0400934 ret = strict_strtoul(tmp + 1, 0, offset);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400935 if (ret)
936 return ret;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400937 *tmp = '\0';
938 } else
939 *offset = 0;
940 return 0;
941}
942
943#define PARAM_MAX_ARGS 16
944#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
945
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400946static int parse_probe_vars(char *arg, const struct fetch_type *t,
947 struct fetch_param *f, int is_return)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400948{
949 int ret = 0;
950 unsigned long param;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400951
Masami Hiramatsu2e06ff62009-10-07 18:27:59 -0400952 if (strcmp(arg, "retval") == 0) {
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400953 if (is_return)
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300954 f->fn = t->fetch[FETCH_MTD_retval];
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400955 else
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400956 ret = -EINVAL;
Masami Hiramatsu2e06ff62009-10-07 18:27:59 -0400957 } else if (strncmp(arg, "stack", 5) == 0) {
958 if (arg[5] == '\0') {
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400959 if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0)
960 f->fn = fetch_stack_address;
961 else
962 ret = -EINVAL;
Masami Hiramatsu2e06ff62009-10-07 18:27:59 -0400963 } else if (isdigit(arg[5])) {
964 ret = strict_strtoul(arg + 5, 10, &param);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400965 if (ret || param > PARAM_MAX_STACK)
966 ret = -EINVAL;
967 else {
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300968 f->fn = t->fetch[FETCH_MTD_stack];
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400969 f->data = (void *)param;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400970 }
Masami Hiramatsu2e06ff62009-10-07 18:27:59 -0400971 } else
972 ret = -EINVAL;
Masami Hiramatsu2e06ff62009-10-07 18:27:59 -0400973 } else
Masami Hiramatsu405b2652009-10-07 18:27:40 -0400974 ret = -EINVAL;
Masami Hiramatsu405b2652009-10-07 18:27:40 -0400975 return ret;
976}
977
Masami Hiramatsuba8665d2009-11-30 19:19:20 -0500978/* Recursive argument parser */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400979static int __parse_probe_arg(char *arg, const struct fetch_type *t,
980 struct fetch_param *f, int is_return)
Masami Hiramatsu405b2652009-10-07 18:27:40 -0400981{
982 int ret = 0;
983 unsigned long param;
984 long offset;
985 char *tmp;
986
987 switch (arg[0]) {
988 case '$':
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400989 ret = parse_probe_vars(arg + 1, t, f, is_return);
Masami Hiramatsu405b2652009-10-07 18:27:40 -0400990 break;
991 case '%': /* named register */
992 ret = regs_query_register_offset(arg + 1);
993 if (ret >= 0) {
Masami Hiramatsue09c8612010-07-05 15:54:45 -0300994 f->fn = t->fetch[FETCH_MTD_reg];
Masami Hiramatsu93ccae72010-04-12 13:17:08 -0400995 f->data = (void *)(unsigned long)ret;
Masami Hiramatsu405b2652009-10-07 18:27:40 -0400996 ret = 0;
997 }
998 break;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -0400999 case '@': /* memory or symbol */
1000 if (isdigit(arg[1])) {
1001 ret = strict_strtoul(arg + 1, 0, &param);
1002 if (ret)
1003 break;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001004 f->fn = t->fetch[FETCH_MTD_memory];
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001005 f->data = (void *)param;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001006 } else {
1007 ret = split_symbol_offset(arg + 1, &offset);
1008 if (ret)
1009 break;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001010 f->data = alloc_symbol_cache(arg + 1, offset);
1011 if (f->data)
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001012 f->fn = t->fetch[FETCH_MTD_symbol];
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001013 }
1014 break;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001015 case '+': /* deref memory */
Masami Hiramatsu76022db2011-02-04 21:51:53 +09001016 arg++; /* Skip '+', because strict_strtol() rejects it. */
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001017 case '-':
1018 tmp = strchr(arg, '(');
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001019 if (!tmp)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001020 break;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001021 *tmp = '\0';
Masami Hiramatsu76022db2011-02-04 21:51:53 +09001022 ret = strict_strtol(arg, 0, &offset);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001023 if (ret)
1024 break;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001025 arg = tmp + 1;
1026 tmp = strrchr(arg, ')');
1027 if (tmp) {
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001028 struct deref_fetch_param *dprm;
1029 const struct fetch_type *t2 = find_fetch_type(NULL);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001030 *tmp = '\0';
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001031 dprm = kzalloc(sizeof(struct deref_fetch_param),
1032 GFP_KERNEL);
1033 if (!dprm)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001034 return -ENOMEM;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001035 dprm->offset = offset;
1036 ret = __parse_probe_arg(arg, t2, &dprm->orig,
1037 is_return);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001038 if (ret)
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001039 kfree(dprm);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001040 else {
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001041 f->fn = t->fetch[FETCH_MTD_deref];
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001042 f->data = (void *)dprm;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001043 }
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001044 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001045 break;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001046 }
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001047 if (!ret && !f->fn) { /* Parsed, but do not find fetch method */
1048 pr_info("%s type has no corresponding fetch method.\n",
1049 t->name);
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001050 ret = -EINVAL;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001051 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001052 return ret;
1053}
1054
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +09001055#define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long))
1056
1057/* Bitfield type needs to be parsed into a fetch function */
1058static int __parse_bitfield_probe_arg(const char *bf,
1059 const struct fetch_type *t,
1060 struct fetch_param *f)
1061{
1062 struct bitfield_fetch_param *bprm;
1063 unsigned long bw, bo;
1064 char *tail;
1065
1066 if (*bf != 'b')
1067 return 0;
1068
1069 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1070 if (!bprm)
1071 return -ENOMEM;
1072 bprm->orig = *f;
1073 f->fn = t->fetch[FETCH_MTD_bitfield];
1074 f->data = (void *)bprm;
1075
1076 bw = simple_strtoul(bf + 1, &tail, 0); /* Use simple one */
1077 if (bw == 0 || *tail != '@')
1078 return -EINVAL;
1079
1080 bf = tail + 1;
1081 bo = simple_strtoul(bf, &tail, 0);
1082 if (tail == bf || *tail != '/')
1083 return -EINVAL;
1084
1085 bprm->hi_shift = BYTES_TO_BITS(t->size) - (bw + bo);
1086 bprm->low_shift = bprm->hi_shift + bo;
1087 return (BYTES_TO_BITS(t->size) < (bw + bo)) ? -EINVAL : 0;
1088}
1089
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001090/* String length checking wrapper */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001091static int parse_probe_arg(char *arg, struct trace_probe *tp,
1092 struct probe_arg *parg, int is_return)
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001093{
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001094 const char *t;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001095 int ret;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001096
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001097 if (strlen(arg) > MAX_ARGSTR_LEN) {
1098 pr_info("Argument is too long.: %s\n", arg);
1099 return -ENOSPC;
1100 }
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001101 parg->comm = kstrdup(arg, GFP_KERNEL);
1102 if (!parg->comm) {
1103 pr_info("Failed to allocate memory for command '%s'.\n", arg);
1104 return -ENOMEM;
1105 }
1106 t = strchr(parg->comm, ':');
1107 if (t) {
1108 arg[t - parg->comm] = '\0';
1109 t++;
1110 }
1111 parg->type = find_fetch_type(t);
1112 if (!parg->type) {
1113 pr_info("Unsupported type: %s\n", t);
1114 return -EINVAL;
1115 }
1116 parg->offset = tp->size;
1117 tp->size += parg->type->size;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001118 ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
Masami Hiramatsu0de4b342011-02-14 14:48:07 +09001119 if (ret >= 0 && t != NULL)
Masami Hiramatsu1ff511e2011-02-04 21:52:05 +09001120 ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch);
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001121 if (ret >= 0) {
1122 parg->fetch_size.fn = get_fetch_size_function(parg->type,
1123 parg->fetch.fn);
1124 parg->fetch_size.data = parg->fetch.data;
1125 }
1126 return ret;
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001127}
1128
Masami Hiramatsua703d942009-10-07 18:28:07 -04001129/* Return 1 if name is reserved or already used by another argument */
1130static int conflict_field_name(const char *name,
1131 struct probe_arg *args, int narg)
1132{
1133 int i;
1134 for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
1135 if (strcmp(reserved_field_names[i], name) == 0)
1136 return 1;
1137 for (i = 0; i < narg; i++)
1138 if (strcmp(args[i].name, name) == 0)
1139 return 1;
1140 return 0;
1141}
1142
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001143static int create_trace_probe(int argc, char **argv)
1144{
1145 /*
1146 * Argument syntax:
Masami Hiramatsu61424312011-06-27 16:26:56 +09001147 * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS]
1148 * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS]
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001149 * Fetch args:
Masami Hiramatsu2e06ff62009-10-07 18:27:59 -04001150 * $retval : fetch return value
1151 * $stack : fetch stack address
1152 * $stackN : fetch Nth of stack (N:0-)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001153 * @ADDR : fetch memory at ADDR (ADDR should be in kernel)
1154 * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol)
1155 * %REG : fetch register REG
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001156 * Dereferencing memory fetch:
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001157 * +|-offs(ARG) : fetch memory at ARG +|- offs address.
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001158 * Alias name of args:
1159 * NAME=FETCHARG : set NAME as alias of FETCHARG.
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001160 * Type of args:
1161 * FETCHARG:TYPE : use TYPE instead of unsigned long.
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001162 */
1163 struct trace_probe *tp;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001164 int i, ret = 0;
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001165 int is_return = 0, is_delete = 0;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001166 char *symbol = NULL, *event = NULL, *group = NULL;
Masami Hiramatsuda346342010-08-27 20:39:12 +09001167 char *arg;
Masami Hiramatsu2fba0c82009-09-10 19:53:14 -04001168 unsigned long offset = 0;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001169 void *addr = NULL;
Masami Hiramatsu4a846b42009-09-11 05:31:21 +02001170 char buf[MAX_EVENT_NAME_LEN];
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001171
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001172 /* argc must be >= 1 */
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001173 if (argv[0][0] == 'p')
1174 is_return = 0;
1175 else if (argv[0][0] == 'r')
1176 is_return = 1;
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001177 else if (argv[0][0] == '-')
1178 is_delete = 1;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001179 else {
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001180 pr_info("Probe definition must be started with 'p', 'r' or"
1181 " '-'.\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001182 return -EINVAL;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001183 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001184
1185 if (argv[0][1] == ':') {
1186 event = &argv[0][2];
Masami Hiramatsuf52487e2009-09-10 19:53:53 -04001187 if (strchr(event, '/')) {
1188 group = event;
1189 event = strchr(group, '/') + 1;
1190 event[-1] = '\0';
1191 if (strlen(group) == 0) {
Wenji Huanga5efd922010-02-24 15:40:23 +08001192 pr_info("Group name is not specified\n");
Masami Hiramatsuf52487e2009-09-10 19:53:53 -04001193 return -EINVAL;
1194 }
1195 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001196 if (strlen(event) == 0) {
Wenji Huanga5efd922010-02-24 15:40:23 +08001197 pr_info("Event name is not specified\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001198 return -EINVAL;
1199 }
1200 }
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001201 if (!group)
1202 group = KPROBE_EVENT_SYSTEM;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001203
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001204 if (is_delete) {
1205 if (!event) {
1206 pr_info("Delete command needs an event name.\n");
1207 return -EINVAL;
1208 }
Srikar Dronamraju9da79ab2010-06-30 14:15:48 +05301209 mutex_lock(&probe_lock);
Masami Hiramatsu7143f162011-06-27 16:26:36 +09001210 tp = find_trace_probe(event, group);
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001211 if (!tp) {
Srikar Dronamraju9da79ab2010-06-30 14:15:48 +05301212 mutex_unlock(&probe_lock);
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001213 pr_info("Event %s/%s doesn't exist.\n", group, event);
1214 return -ENOENT;
1215 }
1216 /* delete an event */
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001217 ret = unregister_trace_probe(tp);
1218 if (ret == 0)
1219 free_trace_probe(tp);
Srikar Dronamraju9da79ab2010-06-30 14:15:48 +05301220 mutex_unlock(&probe_lock);
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001221 return ret;
Masami Hiramatsua7c312b2009-12-08 17:03:16 -05001222 }
1223
1224 if (argc < 2) {
1225 pr_info("Probe point is not specified.\n");
1226 return -EINVAL;
1227 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001228 if (isdigit(argv[1][0])) {
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001229 if (is_return) {
1230 pr_info("Return probe point must be a symbol.\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001231 return -EINVAL;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001232 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001233 /* an address specified */
Heiko Carstensa9bb18f2010-02-10 17:23:47 +01001234 ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr);
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001235 if (ret) {
1236 pr_info("Failed to parse address.\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001237 return ret;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001238 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001239 } else {
1240 /* a symbol specified */
1241 symbol = argv[1];
1242 /* TODO: support .init module functions */
1243 ret = split_symbol_offset(symbol, &offset);
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001244 if (ret) {
1245 pr_info("Failed to parse symbol.\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001246 return ret;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001247 }
1248 if (offset && is_return) {
1249 pr_info("Return probe must be used without offset.\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001250 return -EINVAL;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001251 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001252 }
Masami Hiramatsua82378d2009-08-13 16:35:18 -04001253 argc -= 2; argv += 2;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001254
1255 /* setup a probe */
Masami Hiramatsu42635652009-08-13 16:35:26 -04001256 if (!event) {
1257 /* Make a new event name */
Masami Hiramatsu42635652009-08-13 16:35:26 -04001258 if (symbol)
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -05001259 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld",
Masami Hiramatsu42635652009-08-13 16:35:26 -04001260 is_return ? 'r' : 'p', symbol, offset);
1261 else
Masami Hiramatsu6f3cf442009-12-16 17:24:08 -05001262 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p",
Masami Hiramatsu42635652009-08-13 16:35:26 -04001263 is_return ? 'r' : 'p', addr);
Masami Hiramatsu4a846b42009-09-11 05:31:21 +02001264 event = buf;
1265 }
Masami Hiramatsuf52487e2009-09-10 19:53:53 -04001266 tp = alloc_trace_probe(group, event, addr, symbol, offset, argc,
1267 is_return);
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001268 if (IS_ERR(tp)) {
1269 pr_info("Failed to allocate trace_probe.(%d)\n",
1270 (int)PTR_ERR(tp));
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001271 return PTR_ERR(tp);
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001272 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001273
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001274 /* parse arguments */
Masami Hiramatsua82378d2009-08-13 16:35:18 -04001275 ret = 0;
1276 for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
Masami Hiramatsu61a52732010-08-27 20:38:46 +09001277 /* Increment count for freeing args in error case */
1278 tp->nr_args++;
1279
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001280 /* Parse argument name */
1281 arg = strchr(argv[i], '=');
Masami Hiramatsuaba91592010-08-27 20:39:06 +09001282 if (arg) {
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001283 *arg++ = '\0';
Masami Hiramatsuaba91592010-08-27 20:39:06 +09001284 tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
1285 } else {
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001286 arg = argv[i];
Masami Hiramatsuaba91592010-08-27 20:39:06 +09001287 /* If argument name is omitted, set "argN" */
1288 snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
1289 tp->args[i].name = kstrdup(buf, GFP_KERNEL);
1290 }
Masami Hiramatsua703d942009-10-07 18:28:07 -04001291
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001292 if (!tp->args[i].name) {
Masami Hiramatsuaba91592010-08-27 20:39:06 +09001293 pr_info("Failed to allocate argument[%d] name.\n", i);
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001294 ret = -ENOMEM;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001295 goto error;
1296 }
Masami Hiramatsuda346342010-08-27 20:39:12 +09001297
1298 if (!is_good_name(tp->args[i].name)) {
1299 pr_info("Invalid argument[%d] name: %s\n",
1300 i, tp->args[i].name);
1301 ret = -EINVAL;
1302 goto error;
1303 }
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001304
1305 if (conflict_field_name(tp->args[i].name, tp->args, i)) {
Masami Hiramatsuaba91592010-08-27 20:39:06 +09001306 pr_info("Argument[%d] name '%s' conflicts with "
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001307 "another field.\n", i, argv[i]);
1308 ret = -EINVAL;
1309 goto error;
1310 }
Masami Hiramatsuba8665d2009-11-30 19:19:20 -05001311
1312 /* Parse fetch argument */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001313 ret = parse_probe_arg(arg, tp, &tp->args[i], is_return);
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001314 if (ret) {
Masami Hiramatsuaba91592010-08-27 20:39:06 +09001315 pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001316 goto error;
Masami Hiramatsue63cc232009-10-16 20:07:28 -04001317 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001318 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001319
1320 ret = register_trace_probe(tp);
1321 if (ret)
1322 goto error;
1323 return 0;
1324
1325error:
1326 free_trace_probe(tp);
1327 return ret;
1328}
1329
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001330static int release_all_trace_probes(void)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001331{
1332 struct trace_probe *tp;
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001333 int ret = 0;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001334
1335 mutex_lock(&probe_lock);
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001336 /* Ensure no probe is in use. */
1337 list_for_each_entry(tp, &probe_list, list)
1338 if (trace_probe_is_enabled(tp)) {
1339 ret = -EBUSY;
1340 goto end;
1341 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001342 /* TODO: Use batch unregistration */
1343 while (!list_empty(&probe_list)) {
1344 tp = list_entry(probe_list.next, struct trace_probe, list);
1345 unregister_trace_probe(tp);
1346 free_trace_probe(tp);
1347 }
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001348
1349end:
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001350 mutex_unlock(&probe_lock);
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001351
1352 return ret;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001353}
1354
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001355/* Probes listing interfaces */
1356static void *probes_seq_start(struct seq_file *m, loff_t *pos)
1357{
1358 mutex_lock(&probe_lock);
1359 return seq_list_start(&probe_list, *pos);
1360}
1361
1362static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos)
1363{
1364 return seq_list_next(v, &probe_list, pos);
1365}
1366
1367static void probes_seq_stop(struct seq_file *m, void *v)
1368{
1369 mutex_unlock(&probe_lock);
1370}
1371
1372static int probes_seq_show(struct seq_file *m, void *v)
1373{
1374 struct trace_probe *tp = v;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001375 int i;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001376
Masami Hiramatsu7143f162011-06-27 16:26:36 +09001377 seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p');
Steven Rostedt8f082012010-04-20 10:47:33 -04001378 seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001379
Lai Jiangshan52a11f32009-11-25 16:33:15 +08001380 if (!tp->symbol)
1381 seq_printf(m, " 0x%p", tp->rp.kp.addr);
1382 else if (tp->rp.kp.offset)
Masami Hiramatsu7143f162011-06-27 16:26:36 +09001383 seq_printf(m, " %s+%u", trace_probe_symbol(tp),
1384 tp->rp.kp.offset);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001385 else
Masami Hiramatsu7143f162011-06-27 16:26:36 +09001386 seq_printf(m, " %s", trace_probe_symbol(tp));
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001387
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001388 for (i = 0; i < tp->nr_args; i++)
1389 seq_printf(m, " %s=%s", tp->args[i].name, tp->args[i].comm);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001390 seq_printf(m, "\n");
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001391
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001392 return 0;
1393}
1394
1395static const struct seq_operations probes_seq_op = {
1396 .start = probes_seq_start,
1397 .next = probes_seq_next,
1398 .stop = probes_seq_stop,
1399 .show = probes_seq_show
1400};
1401
1402static int probes_open(struct inode *inode, struct file *file)
1403{
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09001404 int ret;
1405
1406 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
1407 ret = release_all_trace_probes();
1408 if (ret < 0)
1409 return ret;
1410 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001411
1412 return seq_open(file, &probes_seq_op);
1413}
1414
1415static int command_trace_probe(const char *buf)
1416{
1417 char **argv;
1418 int argc = 0, ret = 0;
1419
1420 argv = argv_split(GFP_KERNEL, buf, &argc);
1421 if (!argv)
1422 return -ENOMEM;
1423
1424 if (argc)
1425 ret = create_trace_probe(argc, argv);
1426
1427 argv_free(argv);
1428 return ret;
1429}
1430
Masami Hiramatsue3745362011-02-04 21:51:59 +09001431#define WRITE_BUFSIZE 4096
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001432
1433static ssize_t probes_write(struct file *file, const char __user *buffer,
1434 size_t count, loff_t *ppos)
1435{
1436 char *kbuf, *tmp;
1437 int ret;
1438 size_t done;
1439 size_t size;
1440
1441 kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL);
1442 if (!kbuf)
1443 return -ENOMEM;
1444
1445 ret = done = 0;
1446 while (done < count) {
1447 size = count - done;
1448 if (size >= WRITE_BUFSIZE)
1449 size = WRITE_BUFSIZE - 1;
1450 if (copy_from_user(kbuf, buffer + done, size)) {
1451 ret = -EFAULT;
1452 goto out;
1453 }
1454 kbuf[size] = '\0';
1455 tmp = strchr(kbuf, '\n');
1456 if (tmp) {
1457 *tmp = '\0';
1458 size = tmp - kbuf + 1;
1459 } else if (done + size < count) {
1460 pr_warning("Line length is too long: "
1461 "Should be less than %d.", WRITE_BUFSIZE);
1462 ret = -EINVAL;
1463 goto out;
1464 }
1465 done += size;
1466 /* Remove comments */
1467 tmp = strchr(kbuf, '#');
1468 if (tmp)
1469 *tmp = '\0';
1470
1471 ret = command_trace_probe(kbuf);
1472 if (ret)
1473 goto out;
1474 }
1475 ret = done;
1476out:
1477 kfree(kbuf);
1478 return ret;
1479}
1480
1481static const struct file_operations kprobe_events_ops = {
1482 .owner = THIS_MODULE,
1483 .open = probes_open,
1484 .read = seq_read,
1485 .llseek = seq_lseek,
1486 .release = seq_release,
1487 .write = probes_write,
1488};
1489
Masami Hiramatsucd7e7bd2009-08-13 16:35:42 -04001490/* Probes profiling interfaces */
1491static int probes_profile_seq_show(struct seq_file *m, void *v)
1492{
1493 struct trace_probe *tp = v;
1494
1495 seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit,
Masami Hiramatsu4a846b42009-09-11 05:31:21 +02001496 tp->rp.kp.nmissed);
Masami Hiramatsucd7e7bd2009-08-13 16:35:42 -04001497
1498 return 0;
1499}
1500
1501static const struct seq_operations profile_seq_op = {
1502 .start = probes_seq_start,
1503 .next = probes_seq_next,
1504 .stop = probes_seq_stop,
1505 .show = probes_profile_seq_show
1506};
1507
1508static int profile_open(struct inode *inode, struct file *file)
1509{
1510 return seq_open(file, &profile_seq_op);
1511}
1512
1513static const struct file_operations kprobe_profile_ops = {
1514 .owner = THIS_MODULE,
1515 .open = profile_open,
1516 .read = seq_read,
1517 .llseek = seq_lseek,
1518 .release = seq_release,
1519};
1520
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001521/* Sum up total data length for dynamic arraies (strings) */
1522static __kprobes int __get_data_size(struct trace_probe *tp,
1523 struct pt_regs *regs)
1524{
1525 int i, ret = 0;
1526 u32 len;
1527
1528 for (i = 0; i < tp->nr_args; i++)
1529 if (unlikely(tp->args[i].fetch_size.fn)) {
1530 call_fetch(&tp->args[i].fetch_size, regs, &len);
1531 ret += len;
1532 }
1533
1534 return ret;
1535}
1536
1537/* Store the value of each argument */
1538static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
1539 struct pt_regs *regs,
1540 u8 *data, int maxlen)
1541{
1542 int i;
1543 u32 end = tp->size;
1544 u32 *dl; /* Data (relative) location */
1545
1546 for (i = 0; i < tp->nr_args; i++) {
1547 if (unlikely(tp->args[i].fetch_size.fn)) {
1548 /*
1549 * First, we set the relative location and
1550 * maximum data length to *dl
1551 */
1552 dl = (u32 *)(data + tp->args[i].offset);
1553 *dl = make_data_rloc(maxlen, end - tp->args[i].offset);
1554 /* Then try to fetch string or dynamic array data */
1555 call_fetch(&tp->args[i].fetch, regs, dl);
1556 /* Reduce maximum length */
1557 end += get_rloc_len(*dl);
1558 maxlen -= get_rloc_len(*dl);
1559 /* Trick here, convert data_rloc to data_loc */
1560 *dl = convert_rloc_to_loc(*dl,
1561 ent_size + tp->args[i].offset);
1562 } else
1563 /* Just fetching data normally */
1564 call_fetch(&tp->args[i].fetch, regs,
1565 data + tp->args[i].offset);
1566 }
1567}
1568
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001569/* Kprobe handler */
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001570static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001571{
Masami Hiramatsu4a846b42009-09-11 05:31:21 +02001572 struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001573 struct kprobe_trace_entry_head *entry;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001574 struct ring_buffer_event *event;
Frederic Weisbecker8f8ffe22009-09-11 01:09:23 +02001575 struct ring_buffer *buffer;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001576 int size, dsize, pc;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001577 unsigned long irq_flags;
Masami Hiramatsu42635652009-08-13 16:35:26 -04001578 struct ftrace_event_call *call = &tp->call;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001579
Masami Hiramatsucd7e7bd2009-08-13 16:35:42 -04001580 tp->nhit++;
1581
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001582 local_save_flags(irq_flags);
1583 pc = preempt_count();
1584
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001585 dsize = __get_data_size(tp, regs);
1586 size = sizeof(*entry) + tp->size + dsize;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001587
Steven Rostedt32c0eda2010-04-23 10:38:03 -04001588 event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
1589 size, irq_flags, pc);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001590 if (!event)
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001591 return;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001592
1593 entry = ring_buffer_event_data(event);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001594 entry->ip = (unsigned long)kp->addr;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001595 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001596
Frederic Weisbecker8f8ffe22009-09-11 01:09:23 +02001597 if (!filter_current_check_discard(buffer, call, entry, event))
Masami Hiramatsu1fd8df22011-06-08 16:09:34 +09001598 trace_nowake_buffer_unlock_commit_regs(buffer, event,
1599 irq_flags, pc, regs);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001600}
1601
1602/* Kretprobe handler */
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001603static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001604 struct pt_regs *regs)
1605{
1606 struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001607 struct kretprobe_trace_entry_head *entry;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001608 struct ring_buffer_event *event;
Frederic Weisbecker8f8ffe22009-09-11 01:09:23 +02001609 struct ring_buffer *buffer;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001610 int size, pc, dsize;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001611 unsigned long irq_flags;
Masami Hiramatsu42635652009-08-13 16:35:26 -04001612 struct ftrace_event_call *call = &tp->call;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001613
1614 local_save_flags(irq_flags);
1615 pc = preempt_count();
1616
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001617 dsize = __get_data_size(tp, regs);
1618 size = sizeof(*entry) + tp->size + dsize;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001619
Steven Rostedt32c0eda2010-04-23 10:38:03 -04001620 event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
1621 size, irq_flags, pc);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001622 if (!event)
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001623 return;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001624
1625 entry = ring_buffer_event_data(event);
Masami Hiramatsu4a846b42009-09-11 05:31:21 +02001626 entry->func = (unsigned long)tp->rp.kp.addr;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001627 entry->ret_ip = (unsigned long)ri->ret_addr;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001628 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001629
Frederic Weisbecker8f8ffe22009-09-11 01:09:23 +02001630 if (!filter_current_check_discard(buffer, call, entry, event))
Masami Hiramatsu1fd8df22011-06-08 16:09:34 +09001631 trace_nowake_buffer_unlock_commit_regs(buffer, event,
1632 irq_flags, pc, regs);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001633}
1634
1635/* Event entry printers */
1636enum print_line_t
Steven Rostedta9a57762010-04-22 18:46:14 -04001637print_kprobe_event(struct trace_iterator *iter, int flags,
1638 struct trace_event *event)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001639{
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001640 struct kprobe_trace_entry_head *field;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001641 struct trace_seq *s = &iter->seq;
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001642 struct trace_probe *tp;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001643 u8 *data;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001644 int i;
1645
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001646 field = (struct kprobe_trace_entry_head *)iter->ent;
Steven Rostedt80decc72010-04-23 10:00:22 -04001647 tp = container_of(event, struct trace_probe, call.event);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001648
Masami Hiramatsu6e9f23d2009-09-10 19:53:45 -04001649 if (!trace_seq_printf(s, "%s: (", tp->call.name))
1650 goto partial;
1651
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001652 if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
1653 goto partial;
1654
Masami Hiramatsu6e9f23d2009-09-10 19:53:45 -04001655 if (!trace_seq_puts(s, ")"))
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001656 goto partial;
1657
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001658 data = (u8 *)&field[1];
1659 for (i = 0; i < tp->nr_args; i++)
1660 if (!tp->args[i].type->print(s, tp->args[i].name,
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001661 data + tp->args[i].offset, field))
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001662 goto partial;
1663
1664 if (!trace_seq_puts(s, "\n"))
1665 goto partial;
1666
1667 return TRACE_TYPE_HANDLED;
1668partial:
1669 return TRACE_TYPE_PARTIAL_LINE;
1670}
1671
1672enum print_line_t
Steven Rostedta9a57762010-04-22 18:46:14 -04001673print_kretprobe_event(struct trace_iterator *iter, int flags,
1674 struct trace_event *event)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001675{
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001676 struct kretprobe_trace_entry_head *field;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001677 struct trace_seq *s = &iter->seq;
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001678 struct trace_probe *tp;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001679 u8 *data;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001680 int i;
1681
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001682 field = (struct kretprobe_trace_entry_head *)iter->ent;
Steven Rostedt80decc72010-04-23 10:00:22 -04001683 tp = container_of(event, struct trace_probe, call.event);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001684
Masami Hiramatsu6e9f23d2009-09-10 19:53:45 -04001685 if (!trace_seq_printf(s, "%s: (", tp->call.name))
1686 goto partial;
1687
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001688 if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
1689 goto partial;
1690
1691 if (!trace_seq_puts(s, " <- "))
1692 goto partial;
1693
1694 if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET))
1695 goto partial;
1696
Masami Hiramatsu6e9f23d2009-09-10 19:53:45 -04001697 if (!trace_seq_puts(s, ")"))
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001698 goto partial;
1699
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001700 data = (u8 *)&field[1];
1701 for (i = 0; i < tp->nr_args; i++)
1702 if (!tp->args[i].type->print(s, tp->args[i].name,
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001703 data + tp->args[i].offset, field))
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001704 goto partial;
1705
1706 if (!trace_seq_puts(s, "\n"))
1707 goto partial;
1708
1709 return TRACE_TYPE_HANDLED;
1710partial:
1711 return TRACE_TYPE_PARTIAL_LINE;
1712}
1713
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001714#undef DEFINE_FIELD
1715#define DEFINE_FIELD(type, item, name, is_signed) \
1716 do { \
1717 ret = trace_define_field(event_call, #type, name, \
1718 offsetof(typeof(field), item), \
1719 sizeof(field.item), is_signed, \
1720 FILTER_OTHER); \
1721 if (ret) \
1722 return ret; \
1723 } while (0)
1724
1725static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
1726{
1727 int ret, i;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001728 struct kprobe_trace_entry_head field;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001729 struct trace_probe *tp = (struct trace_probe *)event_call->data;
1730
Masami Hiramatsua703d942009-10-07 18:28:07 -04001731 DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001732 /* Set argument names as fields */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001733 for (i = 0; i < tp->nr_args; i++) {
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001734 ret = trace_define_field(event_call, tp->args[i].type->fmttype,
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001735 tp->args[i].name,
1736 sizeof(field) + tp->args[i].offset,
1737 tp->args[i].type->size,
1738 tp->args[i].type->is_signed,
1739 FILTER_OTHER);
1740 if (ret)
1741 return ret;
1742 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001743 return 0;
1744}
1745
1746static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
1747{
1748 int ret, i;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001749 struct kretprobe_trace_entry_head field;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001750 struct trace_probe *tp = (struct trace_probe *)event_call->data;
1751
Masami Hiramatsua703d942009-10-07 18:28:07 -04001752 DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0);
1753 DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
Masami Hiramatsueca0d912009-09-10 19:53:38 -04001754 /* Set argument names as fields */
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001755 for (i = 0; i < tp->nr_args; i++) {
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001756 ret = trace_define_field(event_call, tp->args[i].type->fmttype,
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001757 tp->args[i].name,
1758 sizeof(field) + tp->args[i].offset,
1759 tp->args[i].type->size,
1760 tp->args[i].type->is_signed,
1761 FILTER_OTHER);
1762 if (ret)
1763 return ret;
1764 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001765 return 0;
1766}
1767
Lai Jiangshana342a0282009-12-15 15:39:49 +08001768static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
1769{
1770 int i;
1771 int pos = 0;
1772
1773 const char *fmt, *arg;
1774
Masami Hiramatsu7143f162011-06-27 16:26:36 +09001775 if (!trace_probe_is_return(tp)) {
Lai Jiangshana342a0282009-12-15 15:39:49 +08001776 fmt = "(%lx)";
1777 arg = "REC->" FIELD_STRING_IP;
1778 } else {
1779 fmt = "(%lx <- %lx)";
1780 arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
1781 }
1782
1783 /* When len=0, we just calculate the needed length */
1784#define LEN_OR_ZERO (len ? len - pos : 0)
1785
1786 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
1787
1788 for (i = 0; i < tp->nr_args; i++) {
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001789 pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
1790 tp->args[i].name, tp->args[i].type->fmt);
Lai Jiangshana342a0282009-12-15 15:39:49 +08001791 }
1792
1793 pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
1794
1795 for (i = 0; i < tp->nr_args; i++) {
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001796 if (strcmp(tp->args[i].type->name, "string") == 0)
1797 pos += snprintf(buf + pos, LEN_OR_ZERO,
1798 ", __get_str(%s)",
1799 tp->args[i].name);
1800 else
1801 pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
1802 tp->args[i].name);
Lai Jiangshana342a0282009-12-15 15:39:49 +08001803 }
1804
1805#undef LEN_OR_ZERO
1806
1807 /* return the length of print_fmt */
1808 return pos;
1809}
1810
1811static int set_print_fmt(struct trace_probe *tp)
1812{
1813 int len;
1814 char *print_fmt;
1815
1816 /* First: called with 0 length to calculate the needed length */
1817 len = __set_print_fmt(tp, NULL, 0);
1818 print_fmt = kmalloc(len + 1, GFP_KERNEL);
1819 if (!print_fmt)
1820 return -ENOMEM;
1821
1822 /* Second: actually write the @print_fmt */
1823 __set_print_fmt(tp, print_fmt, len + 1);
1824 tp->call.print_fmt = print_fmt;
1825
1826 return 0;
1827}
1828
Li Zefan07b139c2009-12-21 14:27:35 +08001829#ifdef CONFIG_PERF_EVENTS
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001830
1831/* Kprobe profile handler */
Frederic Weisbecker97d5a222010-03-05 05:35:37 +01001832static __kprobes void kprobe_perf_func(struct kprobe *kp,
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001833 struct pt_regs *regs)
1834{
1835 struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
1836 struct ftrace_event_call *call = &tp->call;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001837 struct kprobe_trace_entry_head *entry;
Peter Zijlstra1c024eca2010-05-19 14:02:22 +02001838 struct hlist_head *head;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001839 int size, __size, dsize;
Peter Zijlstra4ed7c922009-11-23 11:37:29 +01001840 int rctx;
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001841
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001842 dsize = __get_data_size(tp, regs);
1843 __size = sizeof(*entry) + tp->size + dsize;
Masami Hiramatsu74ebb632009-09-14 16:49:28 -04001844 size = ALIGN(__size + sizeof(u32), sizeof(u64));
1845 size -= sizeof(u32);
Frederic Weisbecker97d5a222010-03-05 05:35:37 +01001846 if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
Masami Hiramatsua1a138d2009-09-25 11:20:12 -07001847 "profile buffer not large enough"))
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001848 return;
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001849
Steven Rostedtff5f1492010-05-21 11:49:57 -04001850 entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
Xiao Guangrong430ad5a2010-01-28 09:32:29 +08001851 if (!entry)
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001852 return;
Frederic Weisbeckerce71b9d2009-11-22 05:26:55 +01001853
Masami Hiramatsua1a138d2009-09-25 11:20:12 -07001854 entry->ip = (unsigned long)kp->addr;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001855 memset(&entry[1], 0, dsize);
1856 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
Frederic Weisbecker444a2a32009-11-06 04:13:05 +01001857
Peter Zijlstra3771f072010-05-21 12:31:09 +02001858 head = this_cpu_ptr(call->perf_events);
Peter Zijlstra1c024eca2010-05-19 14:02:22 +02001859 perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head);
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001860}
1861
1862/* Kretprobe profile handler */
Frederic Weisbecker97d5a222010-03-05 05:35:37 +01001863static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001864 struct pt_regs *regs)
1865{
1866 struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
1867 struct ftrace_event_call *call = &tp->call;
Masami Hiramatsu93ccae72010-04-12 13:17:08 -04001868 struct kretprobe_trace_entry_head *entry;
Peter Zijlstra1c024eca2010-05-19 14:02:22 +02001869 struct hlist_head *head;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001870 int size, __size, dsize;
Peter Zijlstra4ed7c922009-11-23 11:37:29 +01001871 int rctx;
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001872
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001873 dsize = __get_data_size(tp, regs);
1874 __size = sizeof(*entry) + tp->size + dsize;
Masami Hiramatsu74ebb632009-09-14 16:49:28 -04001875 size = ALIGN(__size + sizeof(u32), sizeof(u64));
1876 size -= sizeof(u32);
Frederic Weisbecker97d5a222010-03-05 05:35:37 +01001877 if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
Masami Hiramatsua1a138d2009-09-25 11:20:12 -07001878 "profile buffer not large enough"))
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001879 return;
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001880
Steven Rostedtff5f1492010-05-21 11:49:57 -04001881 entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
Xiao Guangrong430ad5a2010-01-28 09:32:29 +08001882 if (!entry)
Xiao Guangrong1e12a4a2010-01-28 09:34:27 +08001883 return;
Frederic Weisbeckerce71b9d2009-11-22 05:26:55 +01001884
Masami Hiramatsua1a138d2009-09-25 11:20:12 -07001885 entry->func = (unsigned long)tp->rp.kp.addr;
1886 entry->ret_ip = (unsigned long)ri->ret_addr;
Masami Hiramatsue09c8612010-07-05 15:54:45 -03001887 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
Frederic Weisbecker444a2a32009-11-06 04:13:05 +01001888
Peter Zijlstra3771f072010-05-21 12:31:09 +02001889 head = this_cpu_ptr(call->perf_events);
Peter Zijlstra1c024eca2010-05-19 14:02:22 +02001890 perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head);
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001891}
Li Zefan07b139c2009-12-21 14:27:35 +08001892#endif /* CONFIG_PERF_EVENTS */
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001893
Steven Rostedt22392912010-04-21 12:27:06 -04001894static __kprobes
1895int kprobe_register(struct ftrace_event_call *event, enum trace_reg type)
1896{
Masami Hiramatsu1538f882011-06-27 16:26:44 +09001897 struct trace_probe *tp = (struct trace_probe *)event->data;
1898
Steven Rostedt22392912010-04-21 12:27:06 -04001899 switch (type) {
1900 case TRACE_REG_REGISTER:
Masami Hiramatsu1538f882011-06-27 16:26:44 +09001901 return enable_trace_probe(tp, TP_FLAG_TRACE);
Steven Rostedt22392912010-04-21 12:27:06 -04001902 case TRACE_REG_UNREGISTER:
Masami Hiramatsu1538f882011-06-27 16:26:44 +09001903 disable_trace_probe(tp, TP_FLAG_TRACE);
Steven Rostedt22392912010-04-21 12:27:06 -04001904 return 0;
1905
1906#ifdef CONFIG_PERF_EVENTS
1907 case TRACE_REG_PERF_REGISTER:
Masami Hiramatsu1538f882011-06-27 16:26:44 +09001908 return enable_trace_probe(tp, TP_FLAG_PROFILE);
Steven Rostedt22392912010-04-21 12:27:06 -04001909 case TRACE_REG_PERF_UNREGISTER:
Masami Hiramatsu1538f882011-06-27 16:26:44 +09001910 disable_trace_probe(tp, TP_FLAG_PROFILE);
Steven Rostedt22392912010-04-21 12:27:06 -04001911 return 0;
1912#endif
1913 }
1914 return 0;
1915}
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001916
1917static __kprobes
1918int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
1919{
1920 struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
1921
1922 if (tp->flags & TP_FLAG_TRACE)
1923 kprobe_trace_func(kp, regs);
Li Zefan07b139c2009-12-21 14:27:35 +08001924#ifdef CONFIG_PERF_EVENTS
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001925 if (tp->flags & TP_FLAG_PROFILE)
Frederic Weisbecker97d5a222010-03-05 05:35:37 +01001926 kprobe_perf_func(kp, regs);
Li Zefan07b139c2009-12-21 14:27:35 +08001927#endif
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001928 return 0; /* We don't tweek kernel, so just return 0 */
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001929}
1930
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001931static __kprobes
1932int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
1933{
1934 struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
1935
1936 if (tp->flags & TP_FLAG_TRACE)
1937 kretprobe_trace_func(ri, regs);
Li Zefan07b139c2009-12-21 14:27:35 +08001938#ifdef CONFIG_PERF_EVENTS
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001939 if (tp->flags & TP_FLAG_PROFILE)
Frederic Weisbecker97d5a222010-03-05 05:35:37 +01001940 kretprobe_perf_func(ri, regs);
Li Zefan07b139c2009-12-21 14:27:35 +08001941#endif
Masami Hiramatsu50d78052009-09-14 16:49:20 -04001942 return 0; /* We don't tweek kernel, so just return 0 */
1943}
Masami Hiramatsue08d1c62009-09-10 19:53:30 -04001944
Steven Rostedta9a57762010-04-22 18:46:14 -04001945static struct trace_event_functions kretprobe_funcs = {
1946 .trace = print_kretprobe_event
1947};
1948
1949static struct trace_event_functions kprobe_funcs = {
1950 .trace = print_kprobe_event
1951};
1952
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001953static int register_probe_event(struct trace_probe *tp)
1954{
1955 struct ftrace_event_call *call = &tp->call;
1956 int ret;
1957
1958 /* Initialize ftrace_event_call */
Li Zefanffb9f992010-05-24 16:24:52 +08001959 INIT_LIST_HEAD(&call->class->fields);
Masami Hiramatsu7143f162011-06-27 16:26:36 +09001960 if (trace_probe_is_return(tp)) {
Steven Rostedt80decc72010-04-23 10:00:22 -04001961 call->event.funcs = &kretprobe_funcs;
Steven Rostedt2e33af02010-04-22 10:35:55 -04001962 call->class->define_fields = kretprobe_event_define_fields;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001963 } else {
Steven Rostedt80decc72010-04-23 10:00:22 -04001964 call->event.funcs = &kprobe_funcs;
Steven Rostedt2e33af02010-04-22 10:35:55 -04001965 call->class->define_fields = kprobe_event_define_fields;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001966 }
Lai Jiangshana342a0282009-12-15 15:39:49 +08001967 if (set_print_fmt(tp) < 0)
1968 return -ENOMEM;
Steven Rostedt32c0eda2010-04-23 10:38:03 -04001969 ret = register_ftrace_event(&call->event);
1970 if (!ret) {
Lai Jiangshana342a0282009-12-15 15:39:49 +08001971 kfree(call->print_fmt);
Masami Hiramatsuff50d992009-08-13 16:35:34 -04001972 return -ENODEV;
Lai Jiangshana342a0282009-12-15 15:39:49 +08001973 }
Steven Rostedt553552c2010-04-23 11:12:36 -04001974 call->flags = 0;
Steven Rostedt22392912010-04-21 12:27:06 -04001975 call->class->reg = kprobe_register;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001976 call->data = tp;
1977 ret = trace_add_event_call(call);
Masami Hiramatsuff50d992009-08-13 16:35:34 -04001978 if (ret) {
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001979 pr_info("Failed to register kprobe event: %s\n", call->name);
Lai Jiangshana342a0282009-12-15 15:39:49 +08001980 kfree(call->print_fmt);
Steven Rostedt80decc72010-04-23 10:00:22 -04001981 unregister_ftrace_event(&call->event);
Masami Hiramatsuff50d992009-08-13 16:35:34 -04001982 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001983 return ret;
1984}
1985
1986static void unregister_probe_event(struct trace_probe *tp)
1987{
Masami Hiramatsuff50d992009-08-13 16:35:34 -04001988 /* tp->event is unregistered in trace_remove_event_call() */
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001989 trace_remove_event_call(&tp->call);
Lai Jiangshana342a0282009-12-15 15:39:49 +08001990 kfree(tp->call.print_fmt);
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001991}
1992
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001993/* Make a debugfs interface for controlling probe points */
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001994static __init int init_kprobe_trace(void)
1995{
1996 struct dentry *d_tracer;
1997 struct dentry *entry;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04001998
Masami Hiramatsu61424312011-06-27 16:26:56 +09001999 if (register_module_notifier(&trace_probe_module_nb))
2000 return -EINVAL;
2001
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002002 d_tracer = tracing_init_dentry();
2003 if (!d_tracer)
2004 return 0;
2005
2006 entry = debugfs_create_file("kprobe_events", 0644, d_tracer,
2007 NULL, &kprobe_events_ops);
2008
Masami Hiramatsucd7e7bd2009-08-13 16:35:42 -04002009 /* Event list interface */
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002010 if (!entry)
2011 pr_warning("Could not create debugfs "
2012 "'kprobe_events' entry\n");
Masami Hiramatsucd7e7bd2009-08-13 16:35:42 -04002013
2014 /* Profile interface */
2015 entry = debugfs_create_file("kprobe_profile", 0444, d_tracer,
2016 NULL, &kprobe_profile_ops);
2017
2018 if (!entry)
2019 pr_warning("Could not create debugfs "
2020 "'kprobe_profile' entry\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002021 return 0;
2022}
2023fs_initcall(init_kprobe_trace);
2024
2025
2026#ifdef CONFIG_FTRACE_STARTUP_TEST
2027
Steven Rostedt265a5b72011-06-06 22:35:13 -04002028/*
2029 * The "__used" keeps gcc from removing the function symbol
2030 * from the kallsyms table.
2031 */
2032static __used int kprobe_trace_selftest_target(int a1, int a2, int a3,
2033 int a4, int a5, int a6)
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002034{
2035 return a1 + a2 + a3 + a4 + a5 + a6;
2036}
2037
2038static __init int kprobe_trace_self_tests_init(void)
2039{
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002040 int ret, warn = 0;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002041 int (*target)(int, int, int, int, int, int);
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002042 struct trace_probe *tp;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002043
2044 target = kprobe_trace_selftest_target;
2045
2046 pr_info("Testing kprobe tracing: ");
2047
2048 ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target "
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002049 "$stack $stack0 +0($stack)");
2050 if (WARN_ON_ONCE(ret)) {
2051 pr_warning("error on probing function entry.\n");
2052 warn++;
2053 } else {
2054 /* Enable trace point */
Masami Hiramatsu7143f162011-06-27 16:26:36 +09002055 tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM);
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002056 if (WARN_ON_ONCE(tp == NULL)) {
2057 pr_warning("error on getting new probe.\n");
2058 warn++;
2059 } else
Masami Hiramatsu1538f882011-06-27 16:26:44 +09002060 enable_trace_probe(tp, TP_FLAG_TRACE);
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002061 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002062
2063 ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target "
Masami Hiramatsuf397af02009-10-16 20:07:20 -04002064 "$retval");
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002065 if (WARN_ON_ONCE(ret)) {
2066 pr_warning("error on probing function return.\n");
2067 warn++;
2068 } else {
2069 /* Enable trace point */
Masami Hiramatsu7143f162011-06-27 16:26:36 +09002070 tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM);
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002071 if (WARN_ON_ONCE(tp == NULL)) {
2072 pr_warning("error on getting new probe.\n");
2073 warn++;
2074 } else
Masami Hiramatsu1538f882011-06-27 16:26:44 +09002075 enable_trace_probe(tp, TP_FLAG_TRACE);
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002076 }
2077
2078 if (warn)
2079 goto end;
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002080
2081 ret = target(1, 2, 3, 4, 5, 6);
2082
Masami Hiramatsu02ca1522011-10-04 19:44:38 +09002083 /* Disable trace points before removing it */
2084 tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM);
2085 if (WARN_ON_ONCE(tp == NULL)) {
2086 pr_warning("error on getting test probe.\n");
2087 warn++;
2088 } else
2089 disable_trace_probe(tp, TP_FLAG_TRACE);
2090
2091 tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM);
2092 if (WARN_ON_ONCE(tp == NULL)) {
2093 pr_warning("error on getting 2nd test probe.\n");
2094 warn++;
2095 } else
2096 disable_trace_probe(tp, TP_FLAG_TRACE);
2097
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002098 ret = command_trace_probe("-:testprobe");
2099 if (WARN_ON_ONCE(ret)) {
2100 pr_warning("error on deleting a probe.\n");
2101 warn++;
2102 }
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002103
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002104 ret = command_trace_probe("-:testprobe2");
2105 if (WARN_ON_ONCE(ret)) {
2106 pr_warning("error on deleting a probe.\n");
2107 warn++;
2108 }
2109
2110end:
Masami Hiramatsu7143f162011-06-27 16:26:36 +09002111 release_all_trace_probes();
Masami Hiramatsu231e36f2010-01-14 00:12:12 -05002112 if (warn)
2113 pr_cont("NG: Some tests are failed. Please check them.\n");
2114 else
2115 pr_cont("OK\n");
Masami Hiramatsu413d37d2009-08-13 16:35:11 -04002116 return 0;
2117}
2118
2119late_initcall(kprobe_trace_self_tests_init);
2120
2121#endif