Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1 | /* |
Masami Hiramatsu | 77b44d1 | 2009-11-03 19:12:47 -0500 | [diff] [blame] | 2 | * Kprobes-based tracing events |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 3 | * |
| 4 | * Created by Masami Hiramatsu <mhiramat@redhat.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/uaccess.h> |
| 22 | #include <linux/kprobes.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/smp.h> |
| 26 | #include <linux/debugfs.h> |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/ctype.h> |
| 30 | #include <linux/ptrace.h> |
Frederic Weisbecker | d7a4b41 | 2009-09-23 23:08:43 +0200 | [diff] [blame] | 31 | #include <linux/perf_event.h> |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 32 | #include <linux/stringify.h> |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 33 | #include <linux/limits.h> |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 34 | #include <asm/bitsperlong.h> |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 35 | |
| 36 | #include "trace.h" |
| 37 | #include "trace_output.h" |
| 38 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 39 | #define MAX_TRACE_ARGS 128 |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 40 | #define MAX_ARGSTR_LEN 63 |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 41 | #define MAX_EVENT_NAME_LEN 64 |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 42 | #define MAX_STRING_SIZE PATH_MAX |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 43 | #define KPROBE_EVENT_SYSTEM "kprobes" |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 44 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 45 | /* Reserved field names */ |
Masami Hiramatsu | e93f4d8 | 2009-10-07 18:28:14 -0400 | [diff] [blame] | 46 | #define FIELD_STRING_IP "__probe_ip" |
Masami Hiramatsu | e93f4d8 | 2009-10-07 18:28:14 -0400 | [diff] [blame] | 47 | #define FIELD_STRING_RETIP "__probe_ret_ip" |
| 48 | #define FIELD_STRING_FUNC "__probe_func" |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 49 | |
| 50 | const char *reserved_field_names[] = { |
| 51 | "common_type", |
| 52 | "common_flags", |
| 53 | "common_preempt_count", |
| 54 | "common_pid", |
| 55 | "common_tgid", |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 56 | FIELD_STRING_IP, |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 57 | FIELD_STRING_RETIP, |
| 58 | FIELD_STRING_FUNC, |
| 59 | }; |
| 60 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 61 | /* Printing function type */ |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 62 | typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *, |
| 63 | void *); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 64 | #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) \ |
| 69 | static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, \ |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 70 | const char *name, \ |
| 71 | void *data, void *ent)\ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 72 | { \ |
| 73 | return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\ |
| 74 | } \ |
| 75 | static const char PRINT_TYPE_FMT_NAME(type)[] = fmt; |
| 76 | |
| 77 | DEFINE_BASIC_PRINT_TYPE_FUNC(u8, "%x", unsigned int) |
| 78 | DEFINE_BASIC_PRINT_TYPE_FUNC(u16, "%x", unsigned int) |
| 79 | DEFINE_BASIC_PRINT_TYPE_FUNC(u32, "%lx", unsigned long) |
| 80 | DEFINE_BASIC_PRINT_TYPE_FUNC(u64, "%llx", unsigned long long) |
| 81 | DEFINE_BASIC_PRINT_TYPE_FUNC(s8, "%d", int) |
| 82 | DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int) |
| 83 | DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long) |
| 84 | DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long) |
| 85 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 86 | /* 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 | |
| 92 | static inline void *get_rloc_data(u32 *dl) |
| 93 | { |
| 94 | return (u8 *)dl + get_rloc_offs(*dl); |
| 95 | } |
| 96 | |
| 97 | /* For data_loc conversion */ |
| 98 | static 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 */ |
| 111 | typedef u32 string; |
| 112 | typedef u32 string_size; |
| 113 | |
| 114 | /* Print type function for string type */ |
| 115 | static __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 | } |
| 127 | static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\""; |
| 128 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 129 | /* Data fetch function type */ |
| 130 | typedef void (*fetch_func_t)(struct pt_regs *, void *, void *); |
| 131 | |
| 132 | struct fetch_param { |
| 133 | fetch_func_t fn; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 134 | void *data; |
| 135 | }; |
| 136 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 137 | static __kprobes void call_fetch(struct fetch_param *fprm, |
| 138 | struct pt_regs *regs, void *dest) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 139 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 140 | return fprm->fn(regs, fprm->data, dest); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 141 | } |
| 142 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 143 | #define FETCH_FUNC_NAME(method, type) fetch_##method##_##type |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 144 | /* |
| 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 148 | #define DEFINE_BASIC_FETCH_FUNCS(method) \ |
| 149 | DEFINE_FETCH_##method(u8) \ |
| 150 | DEFINE_FETCH_##method(u16) \ |
| 151 | DEFINE_FETCH_##method(u32) \ |
| 152 | DEFINE_FETCH_##method(u64) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 153 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 154 | #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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 162 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 163 | /* Data fetch function templates */ |
| 164 | #define DEFINE_FETCH_reg(type) \ |
| 165 | static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs, \ |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 166 | void *offset, void *dest) \ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 167 | { \ |
| 168 | *(type *)dest = (type)regs_get_register(regs, \ |
| 169 | (unsigned int)((unsigned long)offset)); \ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 170 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 171 | DEFINE_BASIC_FETCH_FUNCS(reg) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 172 | /* No string on the register */ |
| 173 | #define fetch_reg_string NULL |
| 174 | #define fetch_reg_string_size NULL |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 175 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 176 | #define DEFINE_FETCH_stack(type) \ |
| 177 | static __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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 182 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 183 | DEFINE_BASIC_FETCH_FUNCS(stack) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 184 | /* No string on the stack entry */ |
| 185 | #define fetch_stack_string NULL |
| 186 | #define fetch_stack_string_size NULL |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 187 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 188 | #define DEFINE_FETCH_retval(type) \ |
| 189 | static __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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 193 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 194 | DEFINE_BASIC_FETCH_FUNCS(retval) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 195 | /* No string on the retval */ |
| 196 | #define fetch_retval_string NULL |
| 197 | #define fetch_retval_string_size NULL |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 198 | |
| 199 | #define DEFINE_FETCH_memory(type) \ |
| 200 | static __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 | } |
| 209 | DEFINE_BASIC_FETCH_FUNCS(memory) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 210 | /* |
| 211 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max |
| 212 | * length and relative data location. |
| 213 | */ |
| 214 | static __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 */ |
| 245 | static __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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 266 | |
| 267 | /* Memory fetching by symbol */ |
| 268 | struct symbol_cache { |
| 269 | char *symbol; |
| 270 | long offset; |
| 271 | unsigned long addr; |
| 272 | }; |
| 273 | |
| 274 | static 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 | |
| 282 | static void free_symbol_cache(struct symbol_cache *sc) |
| 283 | { |
| 284 | kfree(sc->symbol); |
| 285 | kfree(sc); |
| 286 | } |
| 287 | |
| 288 | static 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 309 | #define DEFINE_FETCH_symbol(type) \ |
| 310 | static __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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 318 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 319 | DEFINE_BASIC_FETCH_FUNCS(symbol) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 320 | DEFINE_FETCH_symbol(string) |
| 321 | DEFINE_FETCH_symbol(string_size) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 322 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 323 | /* Dereference memory access function */ |
| 324 | struct deref_fetch_param { |
| 325 | struct fetch_param orig; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 326 | long offset; |
| 327 | }; |
| 328 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 329 | #define DEFINE_FETCH_deref(type) \ |
| 330 | static __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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 341 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 342 | DEFINE_BASIC_FETCH_FUNCS(deref) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 343 | DEFINE_FETCH_deref(string) |
| 344 | DEFINE_FETCH_deref(string_size) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 345 | |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 346 | static __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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 354 | static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 355 | { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 356 | if (CHECK_FETCH_FUNCS(deref, data->orig.fn)) |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 357 | free_deref_fetch_param(data->orig.data); |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 358 | else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 359 | free_symbol_cache(data->orig.data); |
| 360 | kfree(data); |
| 361 | } |
| 362 | |
Masami Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 363 | /* Bitfield fetch function */ |
| 364 | struct 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) \ |
| 371 | static __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 | } |
| 383 | DEFINE_BASIC_FETCH_FUNCS(bitfield) |
| 384 | #define fetch_bitfield_string NULL |
| 385 | #define fetch_bitfield_string_size NULL |
| 386 | |
| 387 | static __kprobes void |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 388 | update_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 | |
| 400 | static __kprobes void |
Masami Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 401 | free_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 Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 413 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 414 | /* 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 420 | /* Fetch types */ |
| 421 | enum { |
| 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 Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 428 | FETCH_MTD_bitfield, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 429 | FETCH_MTD_END, |
| 430 | }; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 431 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 432 | #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 = { \ |
| 443 | ASSIGN_FETCH_FUNC(reg, ftype), \ |
| 444 | ASSIGN_FETCH_FUNC(stack, ftype), \ |
| 445 | ASSIGN_FETCH_FUNC(retval, ftype), \ |
| 446 | ASSIGN_FETCH_FUNC(memory, ftype), \ |
| 447 | ASSIGN_FETCH_FUNC(symbol, ftype), \ |
| 448 | ASSIGN_FETCH_FUNC(deref, ftype), \ |
Masami Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 449 | ASSIGN_FETCH_FUNC(bitfield, ftype), \ |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 450 | } \ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 451 | } |
| 452 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 453 | #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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 459 | /* Fetch type information table */ |
| 460 | static 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 466 | const char *fmttype; /* Name in format file */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 467 | /* Fetch functions */ |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 468 | fetch_func_t fetch[FETCH_MTD_END]; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 469 | } fetch_type_table[] = { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 470 | /* 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 476 | 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 | |
| 486 | static 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 Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 493 | /* 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 516 | 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 Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 519 | fail: |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 520 | return NULL; |
| 521 | } |
| 522 | |
| 523 | /* Special function : only accept unsigned long */ |
| 524 | static __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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 530 | static 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 545 | /** |
Masami Hiramatsu | 77b44d1 | 2009-11-03 19:12:47 -0500 | [diff] [blame] | 546 | * Kprobe event core functions |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 547 | */ |
| 548 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 549 | struct probe_arg { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 550 | struct fetch_param fetch; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 551 | struct fetch_param fetch_size; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 552 | 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 Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 556 | }; |
| 557 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 558 | /* Flags for trace_probe */ |
| 559 | #define TP_FLAG_TRACE 1 |
| 560 | #define TP_FLAG_PROFILE 2 |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 561 | #define TP_FLAG_REGISTERED 4 |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 562 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 563 | struct trace_probe { |
| 564 | struct list_head list; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 565 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 566 | unsigned long nhit; |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 567 | unsigned int flags; /* For TP_FLAG_* */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 568 | const char *symbol; /* symbol name */ |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 569 | struct ftrace_event_class class; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 570 | struct ftrace_event_call call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 571 | ssize_t size; /* trace entry size */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 572 | unsigned int nr_args; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 573 | struct probe_arg args[]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 574 | }; |
| 575 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 576 | #define SIZEOF_TRACE_PROBE(n) \ |
| 577 | (offsetof(struct trace_probe, args) + \ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 578 | (sizeof(struct probe_arg) * (n))) |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 579 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 580 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 581 | static __kprobes int trace_probe_is_return(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 582 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 583 | return tp->rp.handler != NULL; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 584 | } |
| 585 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 586 | static __kprobes const char *trace_probe_symbol(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 587 | { |
| 588 | return tp->symbol ? tp->symbol : "unknown"; |
| 589 | } |
| 590 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 591 | static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp) |
| 592 | { |
| 593 | return tp->rp.kp.offset; |
| 594 | } |
| 595 | |
| 596 | static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp) |
| 597 | { |
| 598 | return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE)); |
| 599 | } |
| 600 | |
| 601 | static __kprobes bool trace_probe_is_registered(struct trace_probe *tp) |
| 602 | { |
| 603 | return !!(tp->flags & TP_FLAG_REGISTERED); |
| 604 | } |
| 605 | |
| 606 | static __kprobes bool trace_probe_has_gone(struct trace_probe *tp) |
| 607 | { |
| 608 | return !!(kprobe_gone(&tp->rp.kp)); |
| 609 | } |
| 610 | |
| 611 | static __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 | |
| 619 | static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp) |
| 620 | { |
| 621 | return !!strchr(trace_probe_symbol(tp), ':'); |
| 622 | } |
| 623 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 624 | static int register_probe_event(struct trace_probe *tp); |
| 625 | static void unregister_probe_event(struct trace_probe *tp); |
| 626 | |
| 627 | static DEFINE_MUTEX(probe_lock); |
| 628 | static LIST_HEAD(probe_list); |
| 629 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 630 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
| 631 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, |
| 632 | struct pt_regs *regs); |
| 633 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 634 | /* Check the name is good for event/group/fields */ |
| 635 | static int is_good_name(const char *name) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 636 | { |
| 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 Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 646 | /* |
| 647 | * Allocate new trace_probe and initialize it (including kprobes). |
| 648 | */ |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 649 | static struct trace_probe *alloc_trace_probe(const char *group, |
| 650 | const char *event, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 651 | void *addr, |
| 652 | const char *symbol, |
| 653 | unsigned long offs, |
| 654 | int nargs, int is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 655 | { |
| 656 | struct trace_probe *tp; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 657 | int ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 658 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 659 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 660 | if (!tp) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 661 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 662 | |
| 663 | if (symbol) { |
| 664 | tp->symbol = kstrdup(symbol, GFP_KERNEL); |
| 665 | if (!tp->symbol) |
| 666 | goto error; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 667 | 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 Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 673 | tp->rp.handler = kretprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 674 | else |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 675 | tp->rp.kp.pre_handler = kprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 676 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 677 | if (!event || !is_good_name(event)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 678 | ret = -EINVAL; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 679 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 680 | } |
| 681 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 682 | tp->call.class = &tp->class; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 683 | tp->call.name = kstrdup(event, GFP_KERNEL); |
| 684 | if (!tp->call.name) |
| 685 | goto error; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 686 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 687 | if (!group || !is_good_name(group)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 688 | ret = -EINVAL; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 689 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 690 | } |
| 691 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 692 | tp->class.system = kstrdup(group, GFP_KERNEL); |
| 693 | if (!tp->class.system) |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 694 | goto error; |
| 695 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 696 | INIT_LIST_HEAD(&tp->list); |
| 697 | return tp; |
| 698 | error: |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 699 | kfree(tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 700 | kfree(tp->symbol); |
| 701 | kfree(tp); |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 702 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 703 | } |
| 704 | |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 705 | static 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 Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 715 | static void free_probe_arg(struct probe_arg *arg) |
| 716 | { |
Masami Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 717 | 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 720 | free_deref_fetch_param(arg->fetch.data); |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 721 | else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn)) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 722 | free_symbol_cache(arg->fetch.data); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 723 | kfree(arg->name); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 724 | kfree(arg->comm); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 725 | } |
| 726 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 727 | static void free_trace_probe(struct trace_probe *tp) |
| 728 | { |
| 729 | int i; |
| 730 | |
| 731 | for (i = 0; i < tp->nr_args; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 732 | free_probe_arg(&tp->args[i]); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 733 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 734 | kfree(tp->call.class->system); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 735 | kfree(tp->call.name); |
| 736 | kfree(tp->symbol); |
| 737 | kfree(tp); |
| 738 | } |
| 739 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 740 | static struct trace_probe *find_trace_probe(const char *event, |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 741 | const char *group) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 742 | { |
| 743 | struct trace_probe *tp; |
| 744 | |
| 745 | list_for_each_entry(tp, &probe_list, list) |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 746 | if (strcmp(tp->call.name, event) == 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 747 | strcmp(tp->call.class->system, group) == 0) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 748 | return tp; |
| 749 | return NULL; |
| 750 | } |
| 751 | |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 752 | /* Enable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */ |
| 753 | static int enable_trace_probe(struct trace_probe *tp, int flag) |
| 754 | { |
| 755 | int ret = 0; |
| 756 | |
| 757 | tp->flags |= flag; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 758 | if (trace_probe_is_enabled(tp) && trace_probe_is_registered(tp) && |
| 759 | !trace_probe_has_gone(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 760 | 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 */ |
| 770 | static void disable_trace_probe(struct trace_probe *tp, int flag) |
| 771 | { |
| 772 | tp->flags &= ~flag; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 773 | if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 774 | if (trace_probe_is_return(tp)) |
| 775 | disable_kretprobe(&tp->rp); |
| 776 | else |
| 777 | disable_kprobe(&tp->rp.kp); |
| 778 | } |
| 779 | } |
| 780 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 781 | /* Internal register function - just handle k*probes and flags */ |
| 782 | static int __register_trace_probe(struct trace_probe *tp) |
| 783 | { |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 784 | int i, ret; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 785 | |
| 786 | if (trace_probe_is_registered(tp)) |
| 787 | return -EINVAL; |
| 788 | |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 789 | for (i = 0; i < tp->nr_args; i++) |
| 790 | update_probe_arg(&tp->args[i]); |
| 791 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 792 | /* 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 */ |
| 824 | static 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 Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 838 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 839 | static int unregister_trace_probe(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 840 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 841 | /* Enabled event can not be unregistered */ |
| 842 | if (trace_probe_is_enabled(tp)) |
| 843 | return -EBUSY; |
| 844 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 845 | __unregister_trace_probe(tp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 846 | list_del(&tp->list); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 847 | unregister_probe_event(tp); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 848 | |
| 849 | return 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | /* Register a trace_probe and probe_event */ |
| 853 | static 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 Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 860 | /* Delete old (same name) event if exist */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 861 | old_tp = find_trace_probe(tp->call.name, tp->call.class->system); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 862 | if (old_tp) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 863 | ret = unregister_trace_probe(old_tp); |
| 864 | if (ret < 0) |
| 865 | goto end; |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 866 | free_trace_probe(old_tp); |
| 867 | } |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 868 | |
| 869 | /* Register new event */ |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 870 | ret = register_probe_event(tp); |
| 871 | if (ret) { |
Paul Bolle | 426d310 | 2010-08-07 12:30:03 +0200 | [diff] [blame] | 872 | pr_warning("Failed to register probe event(%d)\n", ret); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 873 | goto end; |
| 874 | } |
| 875 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 876 | /* Register k*probe */ |
| 877 | ret = __register_trace_probe(tp); |
| 878 | if (ret < 0) |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 879 | unregister_probe_event(tp); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 880 | else |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 881 | list_add_tail(&tp->list, &probe_list); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 882 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 883 | end: |
| 884 | mutex_unlock(&probe_lock); |
| 885 | return ret; |
| 886 | } |
| 887 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 888 | /* Module notifier call back, checking event on the module */ |
| 889 | static 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 Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 903 | /* Don't need to check busy - this should have gone. */ |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 904 | __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 | |
| 917 | static 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 922 | /* Split symbol and offset. */ |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 923 | static int split_symbol_offset(char *symbol, unsigned long *offset) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 924 | { |
| 925 | char *tmp; |
| 926 | int ret; |
| 927 | |
| 928 | if (!offset) |
| 929 | return -EINVAL; |
| 930 | |
| 931 | tmp = strchr(symbol, '+'); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 932 | if (tmp) { |
| 933 | /* skip sign because strict_strtol doesn't accept '+' */ |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 934 | ret = strict_strtoul(tmp + 1, 0, offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 935 | if (ret) |
| 936 | return ret; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 937 | *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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 946 | static int parse_probe_vars(char *arg, const struct fetch_type *t, |
| 947 | struct fetch_param *f, int is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 948 | { |
| 949 | int ret = 0; |
| 950 | unsigned long param; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 951 | |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 952 | if (strcmp(arg, "retval") == 0) { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 953 | if (is_return) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 954 | f->fn = t->fetch[FETCH_MTD_retval]; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 955 | else |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 956 | ret = -EINVAL; |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 957 | } else if (strncmp(arg, "stack", 5) == 0) { |
| 958 | if (arg[5] == '\0') { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 959 | if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0) |
| 960 | f->fn = fetch_stack_address; |
| 961 | else |
| 962 | ret = -EINVAL; |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 963 | } else if (isdigit(arg[5])) { |
| 964 | ret = strict_strtoul(arg + 5, 10, ¶m); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 965 | if (ret || param > PARAM_MAX_STACK) |
| 966 | ret = -EINVAL; |
| 967 | else { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 968 | f->fn = t->fetch[FETCH_MTD_stack]; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 969 | f->data = (void *)param; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 970 | } |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 971 | } else |
| 972 | ret = -EINVAL; |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 973 | } else |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 974 | ret = -EINVAL; |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 975 | return ret; |
| 976 | } |
| 977 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 978 | /* Recursive argument parser */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 979 | static int __parse_probe_arg(char *arg, const struct fetch_type *t, |
| 980 | struct fetch_param *f, int is_return) |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 981 | { |
| 982 | int ret = 0; |
| 983 | unsigned long param; |
| 984 | long offset; |
| 985 | char *tmp; |
| 986 | |
| 987 | switch (arg[0]) { |
| 988 | case '$': |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 989 | ret = parse_probe_vars(arg + 1, t, f, is_return); |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 990 | break; |
| 991 | case '%': /* named register */ |
| 992 | ret = regs_query_register_offset(arg + 1); |
| 993 | if (ret >= 0) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 994 | f->fn = t->fetch[FETCH_MTD_reg]; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 995 | f->data = (void *)(unsigned long)ret; |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 996 | ret = 0; |
| 997 | } |
| 998 | break; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 999 | case '@': /* memory or symbol */ |
| 1000 | if (isdigit(arg[1])) { |
| 1001 | ret = strict_strtoul(arg + 1, 0, ¶m); |
| 1002 | if (ret) |
| 1003 | break; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1004 | f->fn = t->fetch[FETCH_MTD_memory]; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1005 | f->data = (void *)param; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1006 | } else { |
| 1007 | ret = split_symbol_offset(arg + 1, &offset); |
| 1008 | if (ret) |
| 1009 | break; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1010 | f->data = alloc_symbol_cache(arg + 1, offset); |
| 1011 | if (f->data) |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1012 | f->fn = t->fetch[FETCH_MTD_symbol]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1013 | } |
| 1014 | break; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1015 | case '+': /* deref memory */ |
Masami Hiramatsu | 76022db | 2011-02-04 21:51:53 +0900 | [diff] [blame] | 1016 | arg++; /* Skip '+', because strict_strtol() rejects it. */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1017 | case '-': |
| 1018 | tmp = strchr(arg, '('); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1019 | if (!tmp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1020 | break; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1021 | *tmp = '\0'; |
Masami Hiramatsu | 76022db | 2011-02-04 21:51:53 +0900 | [diff] [blame] | 1022 | ret = strict_strtol(arg, 0, &offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1023 | if (ret) |
| 1024 | break; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1025 | arg = tmp + 1; |
| 1026 | tmp = strrchr(arg, ')'); |
| 1027 | if (tmp) { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1028 | struct deref_fetch_param *dprm; |
| 1029 | const struct fetch_type *t2 = find_fetch_type(NULL); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1030 | *tmp = '\0'; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1031 | dprm = kzalloc(sizeof(struct deref_fetch_param), |
| 1032 | GFP_KERNEL); |
| 1033 | if (!dprm) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1034 | return -ENOMEM; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1035 | dprm->offset = offset; |
| 1036 | ret = __parse_probe_arg(arg, t2, &dprm->orig, |
| 1037 | is_return); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1038 | if (ret) |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1039 | kfree(dprm); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1040 | else { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1041 | f->fn = t->fetch[FETCH_MTD_deref]; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1042 | f->data = (void *)dprm; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1043 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1044 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1045 | break; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1046 | } |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1047 | 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1050 | ret = -EINVAL; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1051 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1052 | return ret; |
| 1053 | } |
| 1054 | |
Masami Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 1055 | #define BYTES_TO_BITS(nb) ((BITS_PER_LONG * (nb)) / sizeof(long)) |
| 1056 | |
| 1057 | /* Bitfield type needs to be parsed into a fetch function */ |
| 1058 | static 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 Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1090 | /* String length checking wrapper */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1091 | static int parse_probe_arg(char *arg, struct trace_probe *tp, |
| 1092 | struct probe_arg *parg, int is_return) |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1093 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1094 | const char *t; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1095 | int ret; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1096 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1097 | if (strlen(arg) > MAX_ARGSTR_LEN) { |
| 1098 | pr_info("Argument is too long.: %s\n", arg); |
| 1099 | return -ENOSPC; |
| 1100 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1101 | 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1118 | ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return); |
Masami Hiramatsu | 0de4b34 | 2011-02-14 14:48:07 +0900 | [diff] [blame] | 1119 | if (ret >= 0 && t != NULL) |
Masami Hiramatsu | 1ff511e | 2011-02-04 21:52:05 +0900 | [diff] [blame] | 1120 | ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch); |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1121 | 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 Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1127 | } |
| 1128 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1129 | /* Return 1 if name is reserved or already used by another argument */ |
| 1130 | static 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1143 | static int create_trace_probe(int argc, char **argv) |
| 1144 | { |
| 1145 | /* |
| 1146 | * Argument syntax: |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 1147 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
| 1148 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1149 | * Fetch args: |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 1150 | * $retval : fetch return value |
| 1151 | * $stack : fetch stack address |
| 1152 | * $stackN : fetch Nth of stack (N:0-) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1153 | * @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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1156 | * Dereferencing memory fetch: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1157 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1158 | * Alias name of args: |
| 1159 | * NAME=FETCHARG : set NAME as alias of FETCHARG. |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1160 | * Type of args: |
| 1161 | * FETCHARG:TYPE : use TYPE instead of unsigned long. |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1162 | */ |
| 1163 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1164 | int i, ret = 0; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1165 | int is_return = 0, is_delete = 0; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1166 | char *symbol = NULL, *event = NULL, *group = NULL; |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 1167 | char *arg; |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 1168 | unsigned long offset = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1169 | void *addr = NULL; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 1170 | char buf[MAX_EVENT_NAME_LEN]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1171 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1172 | /* argc must be >= 1 */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1173 | if (argv[0][0] == 'p') |
| 1174 | is_return = 0; |
| 1175 | else if (argv[0][0] == 'r') |
| 1176 | is_return = 1; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1177 | else if (argv[0][0] == '-') |
| 1178 | is_delete = 1; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1179 | else { |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1180 | pr_info("Probe definition must be started with 'p', 'r' or" |
| 1181 | " '-'.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1182 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1183 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1184 | |
| 1185 | if (argv[0][1] == ':') { |
| 1186 | event = &argv[0][2]; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 1187 | if (strchr(event, '/')) { |
| 1188 | group = event; |
| 1189 | event = strchr(group, '/') + 1; |
| 1190 | event[-1] = '\0'; |
| 1191 | if (strlen(group) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 1192 | pr_info("Group name is not specified\n"); |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 1193 | return -EINVAL; |
| 1194 | } |
| 1195 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1196 | if (strlen(event) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 1197 | pr_info("Event name is not specified\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1198 | return -EINVAL; |
| 1199 | } |
| 1200 | } |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1201 | if (!group) |
| 1202 | group = KPROBE_EVENT_SYSTEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1203 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1204 | if (is_delete) { |
| 1205 | if (!event) { |
| 1206 | pr_info("Delete command needs an event name.\n"); |
| 1207 | return -EINVAL; |
| 1208 | } |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 1209 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1210 | tp = find_trace_probe(event, group); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1211 | if (!tp) { |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 1212 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1213 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
| 1214 | return -ENOENT; |
| 1215 | } |
| 1216 | /* delete an event */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1217 | ret = unregister_trace_probe(tp); |
| 1218 | if (ret == 0) |
| 1219 | free_trace_probe(tp); |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 1220 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1221 | return ret; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 1222 | } |
| 1223 | |
| 1224 | if (argc < 2) { |
| 1225 | pr_info("Probe point is not specified.\n"); |
| 1226 | return -EINVAL; |
| 1227 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1228 | if (isdigit(argv[1][0])) { |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1229 | if (is_return) { |
| 1230 | pr_info("Return probe point must be a symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1231 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1232 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1233 | /* an address specified */ |
Heiko Carstens | a9bb18f | 2010-02-10 17:23:47 +0100 | [diff] [blame] | 1234 | ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1235 | if (ret) { |
| 1236 | pr_info("Failed to parse address.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1237 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1238 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1239 | } else { |
| 1240 | /* a symbol specified */ |
| 1241 | symbol = argv[1]; |
| 1242 | /* TODO: support .init module functions */ |
| 1243 | ret = split_symbol_offset(symbol, &offset); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1244 | if (ret) { |
| 1245 | pr_info("Failed to parse symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1246 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1247 | } |
| 1248 | if (offset && is_return) { |
| 1249 | pr_info("Return probe must be used without offset.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1250 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1251 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1252 | } |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 1253 | argc -= 2; argv += 2; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1254 | |
| 1255 | /* setup a probe */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 1256 | if (!event) { |
| 1257 | /* Make a new event name */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 1258 | if (symbol) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 1259 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 1260 | is_return ? 'r' : 'p', symbol, offset); |
| 1261 | else |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 1262 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 1263 | is_return ? 'r' : 'p', addr); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 1264 | event = buf; |
| 1265 | } |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 1266 | tp = alloc_trace_probe(group, event, addr, symbol, offset, argc, |
| 1267 | is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1268 | if (IS_ERR(tp)) { |
| 1269 | pr_info("Failed to allocate trace_probe.(%d)\n", |
| 1270 | (int)PTR_ERR(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1271 | return PTR_ERR(tp); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1272 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1273 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1274 | /* parse arguments */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 1275 | ret = 0; |
| 1276 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
Masami Hiramatsu | 61a5273 | 2010-08-27 20:38:46 +0900 | [diff] [blame] | 1277 | /* Increment count for freeing args in error case */ |
| 1278 | tp->nr_args++; |
| 1279 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1280 | /* Parse argument name */ |
| 1281 | arg = strchr(argv[i], '='); |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 1282 | if (arg) { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1283 | *arg++ = '\0'; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 1284 | tp->args[i].name = kstrdup(argv[i], GFP_KERNEL); |
| 1285 | } else { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1286 | arg = argv[i]; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 1287 | /* 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 Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1291 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1292 | if (!tp->args[i].name) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 1293 | pr_info("Failed to allocate argument[%d] name.\n", i); |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1294 | ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1295 | goto error; |
| 1296 | } |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 1297 | |
| 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1304 | |
| 1305 | if (conflict_field_name(tp->args[i].name, tp->args, i)) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 1306 | pr_info("Argument[%d] name '%s' conflicts with " |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1307 | "another field.\n", i, argv[i]); |
| 1308 | ret = -EINVAL; |
| 1309 | goto error; |
| 1310 | } |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 1311 | |
| 1312 | /* Parse fetch argument */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1313 | ret = parse_probe_arg(arg, tp, &tp->args[i], is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1314 | if (ret) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 1315 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1316 | goto error; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 1317 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1318 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1319 | |
| 1320 | ret = register_trace_probe(tp); |
| 1321 | if (ret) |
| 1322 | goto error; |
| 1323 | return 0; |
| 1324 | |
| 1325 | error: |
| 1326 | free_trace_probe(tp); |
| 1327 | return ret; |
| 1328 | } |
| 1329 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1330 | static int release_all_trace_probes(void) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1331 | { |
| 1332 | struct trace_probe *tp; |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1333 | int ret = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1334 | |
| 1335 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1336 | /* 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1342 | /* 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 Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1348 | |
| 1349 | end: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1350 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1351 | |
| 1352 | return ret; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1353 | } |
| 1354 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1355 | /* Probes listing interfaces */ |
| 1356 | static 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 | |
| 1362 | static 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 | |
| 1367 | static void probes_seq_stop(struct seq_file *m, void *v) |
| 1368 | { |
| 1369 | mutex_unlock(&probe_lock); |
| 1370 | } |
| 1371 | |
| 1372 | static int probes_seq_show(struct seq_file *m, void *v) |
| 1373 | { |
| 1374 | struct trace_probe *tp = v; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1375 | int i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1376 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1377 | seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p'); |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 1378 | seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1379 | |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 1380 | if (!tp->symbol) |
| 1381 | seq_printf(m, " 0x%p", tp->rp.kp.addr); |
| 1382 | else if (tp->rp.kp.offset) |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1383 | seq_printf(m, " %s+%u", trace_probe_symbol(tp), |
| 1384 | tp->rp.kp.offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1385 | else |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1386 | seq_printf(m, " %s", trace_probe_symbol(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1387 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1388 | for (i = 0; i < tp->nr_args; i++) |
| 1389 | seq_printf(m, " %s=%s", tp->args[i].name, tp->args[i].comm); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1390 | seq_printf(m, "\n"); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1391 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1392 | return 0; |
| 1393 | } |
| 1394 | |
| 1395 | static 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 | |
| 1402 | static int probes_open(struct inode *inode, struct file *file) |
| 1403 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1404 | 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1411 | |
| 1412 | return seq_open(file, &probes_seq_op); |
| 1413 | } |
| 1414 | |
| 1415 | static 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 Hiramatsu | e374536 | 2011-02-04 21:51:59 +0900 | [diff] [blame] | 1431 | #define WRITE_BUFSIZE 4096 |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1432 | |
| 1433 | static 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; |
| 1476 | out: |
| 1477 | kfree(kbuf); |
| 1478 | return ret; |
| 1479 | } |
| 1480 | |
| 1481 | static 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 Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1490 | /* Probes profiling interfaces */ |
| 1491 | static 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 Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 1496 | tp->rp.kp.nmissed); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1497 | |
| 1498 | return 0; |
| 1499 | } |
| 1500 | |
| 1501 | static 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 | |
| 1508 | static int profile_open(struct inode *inode, struct file *file) |
| 1509 | { |
| 1510 | return seq_open(file, &profile_seq_op); |
| 1511 | } |
| 1512 | |
| 1513 | static 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1521 | /* Sum up total data length for dynamic arraies (strings) */ |
| 1522 | static __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 */ |
| 1538 | static __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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1569 | /* Kprobe handler */ |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1570 | static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1571 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 1572 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1573 | struct kprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1574 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 1575 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1576 | int size, dsize, pc; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1577 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 1578 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1579 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1580 | tp->nhit++; |
| 1581 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1582 | local_save_flags(irq_flags); |
| 1583 | pc = preempt_count(); |
| 1584 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1585 | dsize = __get_data_size(tp, regs); |
| 1586 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1587 | |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 1588 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
| 1589 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1590 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1591 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1592 | |
| 1593 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1594 | entry->ip = (unsigned long)kp->addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1595 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1596 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 1597 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Masami Hiramatsu | 1fd8df2 | 2011-06-08 16:09:34 +0900 | [diff] [blame] | 1598 | trace_nowake_buffer_unlock_commit_regs(buffer, event, |
| 1599 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1600 | } |
| 1601 | |
| 1602 | /* Kretprobe handler */ |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1603 | static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri, |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1604 | struct pt_regs *regs) |
| 1605 | { |
| 1606 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1607 | struct kretprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1608 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 1609 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1610 | int size, pc, dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1611 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 1612 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1613 | |
| 1614 | local_save_flags(irq_flags); |
| 1615 | pc = preempt_count(); |
| 1616 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1617 | dsize = __get_data_size(tp, regs); |
| 1618 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1619 | |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 1620 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
| 1621 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1622 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1623 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1624 | |
| 1625 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 1626 | entry->func = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1627 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1628 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1629 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 1630 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Masami Hiramatsu | 1fd8df2 | 2011-06-08 16:09:34 +0900 | [diff] [blame] | 1631 | trace_nowake_buffer_unlock_commit_regs(buffer, event, |
| 1632 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1633 | } |
| 1634 | |
| 1635 | /* Event entry printers */ |
| 1636 | enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1637 | print_kprobe_event(struct trace_iterator *iter, int flags, |
| 1638 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1639 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1640 | struct kprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1641 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1642 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1643 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1644 | int i; |
| 1645 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1646 | field = (struct kprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1647 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1648 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1649 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 1650 | goto partial; |
| 1651 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1652 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 1653 | goto partial; |
| 1654 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1655 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1656 | goto partial; |
| 1657 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1658 | 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1661 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1662 | goto partial; |
| 1663 | |
| 1664 | if (!trace_seq_puts(s, "\n")) |
| 1665 | goto partial; |
| 1666 | |
| 1667 | return TRACE_TYPE_HANDLED; |
| 1668 | partial: |
| 1669 | return TRACE_TYPE_PARTIAL_LINE; |
| 1670 | } |
| 1671 | |
| 1672 | enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1673 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
| 1674 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1675 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1676 | struct kretprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1677 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1678 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1679 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1680 | int i; |
| 1681 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1682 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1683 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1684 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1685 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 1686 | goto partial; |
| 1687 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1688 | 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 Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1697 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1698 | goto partial; |
| 1699 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1700 | 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 Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1703 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1704 | goto partial; |
| 1705 | |
| 1706 | if (!trace_seq_puts(s, "\n")) |
| 1707 | goto partial; |
| 1708 | |
| 1709 | return TRACE_TYPE_HANDLED; |
| 1710 | partial: |
| 1711 | return TRACE_TYPE_PARTIAL_LINE; |
| 1712 | } |
| 1713 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1714 | #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 | |
| 1725 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 1726 | { |
| 1727 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1728 | struct kprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1729 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 1730 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1731 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1732 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1733 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1734 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1735 | 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1743 | return 0; |
| 1744 | } |
| 1745 | |
| 1746 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 1747 | { |
| 1748 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1749 | struct kretprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1750 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 1751 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1752 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
| 1753 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1754 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1755 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1756 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1757 | 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1765 | return 0; |
| 1766 | } |
| 1767 | |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1768 | static 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 Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1775 | if (!trace_probe_is_return(tp)) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1776 | 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1789 | pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s", |
| 1790 | tp->args[i].name, tp->args[i].type->fmt); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg); |
| 1794 | |
| 1795 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1796 | 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 Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1803 | } |
| 1804 | |
| 1805 | #undef LEN_OR_ZERO |
| 1806 | |
| 1807 | /* return the length of print_fmt */ |
| 1808 | return pos; |
| 1809 | } |
| 1810 | |
| 1811 | static 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 Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1829 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1830 | |
| 1831 | /* Kprobe profile handler */ |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1832 | static __kprobes void kprobe_perf_func(struct kprobe *kp, |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1833 | 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1837 | struct kprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1838 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1839 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1840 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1841 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1842 | dsize = __get_data_size(tp, regs); |
| 1843 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1844 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1845 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1846 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1847 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1848 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1849 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1850 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1851 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1852 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1853 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1854 | entry->ip = (unsigned long)kp->addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1855 | memset(&entry[1], 0, dsize); |
| 1856 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1857 | |
Peter Zijlstra | 3771f07 | 2010-05-21 12:31:09 +0200 | [diff] [blame] | 1858 | head = this_cpu_ptr(call->perf_events); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1859 | perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1860 | } |
| 1861 | |
| 1862 | /* Kretprobe profile handler */ |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1863 | static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri, |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1864 | 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 Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1868 | struct kretprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1869 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1870 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1871 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1872 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1873 | dsize = __get_data_size(tp, regs); |
| 1874 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1875 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1876 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1877 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1878 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1879 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1880 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1881 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1882 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1883 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1884 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1885 | entry->func = (unsigned long)tp->rp.kp.addr; |
| 1886 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1887 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1888 | |
Peter Zijlstra | 3771f07 | 2010-05-21 12:31:09 +0200 | [diff] [blame] | 1889 | head = this_cpu_ptr(call->perf_events); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1890 | perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1891 | } |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1892 | #endif /* CONFIG_PERF_EVENTS */ |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1893 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1894 | static __kprobes |
| 1895 | int kprobe_register(struct ftrace_event_call *event, enum trace_reg type) |
| 1896 | { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1897 | struct trace_probe *tp = (struct trace_probe *)event->data; |
| 1898 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1899 | switch (type) { |
| 1900 | case TRACE_REG_REGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1901 | return enable_trace_probe(tp, TP_FLAG_TRACE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1902 | case TRACE_REG_UNREGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1903 | disable_trace_probe(tp, TP_FLAG_TRACE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1904 | return 0; |
| 1905 | |
| 1906 | #ifdef CONFIG_PERF_EVENTS |
| 1907 | case TRACE_REG_PERF_REGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1908 | return enable_trace_probe(tp, TP_FLAG_PROFILE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1909 | case TRACE_REG_PERF_UNREGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1910 | disable_trace_probe(tp, TP_FLAG_PROFILE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1911 | return 0; |
| 1912 | #endif |
| 1913 | } |
| 1914 | return 0; |
| 1915 | } |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1916 | |
| 1917 | static __kprobes |
| 1918 | int 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 Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1924 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1925 | if (tp->flags & TP_FLAG_PROFILE) |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1926 | kprobe_perf_func(kp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1927 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1928 | return 0; /* We don't tweek kernel, so just return 0 */ |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1929 | } |
| 1930 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1931 | static __kprobes |
| 1932 | int 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 Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1938 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1939 | if (tp->flags & TP_FLAG_PROFILE) |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1940 | kretprobe_perf_func(ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1941 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1942 | return 0; /* We don't tweek kernel, so just return 0 */ |
| 1943 | } |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1944 | |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1945 | static struct trace_event_functions kretprobe_funcs = { |
| 1946 | .trace = print_kretprobe_event |
| 1947 | }; |
| 1948 | |
| 1949 | static struct trace_event_functions kprobe_funcs = { |
| 1950 | .trace = print_kprobe_event |
| 1951 | }; |
| 1952 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1953 | static 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 Zefan | ffb9f99 | 2010-05-24 16:24:52 +0800 | [diff] [blame] | 1959 | INIT_LIST_HEAD(&call->class->fields); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1960 | if (trace_probe_is_return(tp)) { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1961 | call->event.funcs = &kretprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1962 | call->class->define_fields = kretprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1963 | } else { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1964 | call->event.funcs = &kprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1965 | call->class->define_fields = kprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1966 | } |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1967 | if (set_print_fmt(tp) < 0) |
| 1968 | return -ENOMEM; |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 1969 | ret = register_ftrace_event(&call->event); |
| 1970 | if (!ret) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1971 | kfree(call->print_fmt); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1972 | return -ENODEV; |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1973 | } |
Steven Rostedt | 553552c | 2010-04-23 11:12:36 -0400 | [diff] [blame] | 1974 | call->flags = 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1975 | call->class->reg = kprobe_register; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1976 | call->data = tp; |
| 1977 | ret = trace_add_event_call(call); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1978 | if (ret) { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1979 | pr_info("Failed to register kprobe event: %s\n", call->name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1980 | kfree(call->print_fmt); |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1981 | unregister_ftrace_event(&call->event); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1982 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1983 | return ret; |
| 1984 | } |
| 1985 | |
| 1986 | static void unregister_probe_event(struct trace_probe *tp) |
| 1987 | { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1988 | /* tp->event is unregistered in trace_remove_event_call() */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1989 | trace_remove_event_call(&tp->call); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1990 | kfree(tp->call.print_fmt); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1991 | } |
| 1992 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1993 | /* Make a debugfs interface for controlling probe points */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1994 | static __init int init_kprobe_trace(void) |
| 1995 | { |
| 1996 | struct dentry *d_tracer; |
| 1997 | struct dentry *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1998 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 1999 | if (register_module_notifier(&trace_probe_module_nb)) |
| 2000 | return -EINVAL; |
| 2001 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2002 | 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 Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 2009 | /* Event list interface */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2010 | if (!entry) |
| 2011 | pr_warning("Could not create debugfs " |
| 2012 | "'kprobe_events' entry\n"); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 2013 | |
| 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 Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2021 | return 0; |
| 2022 | } |
| 2023 | fs_initcall(init_kprobe_trace); |
| 2024 | |
| 2025 | |
| 2026 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 2027 | |
Steven Rostedt | 265a5b7 | 2011-06-06 22:35:13 -0400 | [diff] [blame] | 2028 | /* |
| 2029 | * The "__used" keeps gcc from removing the function symbol |
| 2030 | * from the kallsyms table. |
| 2031 | */ |
| 2032 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, |
| 2033 | int a4, int a5, int a6) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2034 | { |
| 2035 | return a1 + a2 + a3 + a4 + a5 + a6; |
| 2036 | } |
| 2037 | |
| 2038 | static __init int kprobe_trace_self_tests_init(void) |
| 2039 | { |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2040 | int ret, warn = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2041 | int (*target)(int, int, int, int, int, int); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2042 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2043 | |
| 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 Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2049 | "$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 Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 2055 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2056 | if (WARN_ON_ONCE(tp == NULL)) { |
| 2057 | pr_warning("error on getting new probe.\n"); |
| 2058 | warn++; |
| 2059 | } else |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 2060 | enable_trace_probe(tp, TP_FLAG_TRACE); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2061 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2062 | |
| 2063 | ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target " |
Masami Hiramatsu | f397af0 | 2009-10-16 20:07:20 -0400 | [diff] [blame] | 2064 | "$retval"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2065 | if (WARN_ON_ONCE(ret)) { |
| 2066 | pr_warning("error on probing function return.\n"); |
| 2067 | warn++; |
| 2068 | } else { |
| 2069 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 2070 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2071 | if (WARN_ON_ONCE(tp == NULL)) { |
| 2072 | pr_warning("error on getting new probe.\n"); |
| 2073 | warn++; |
| 2074 | } else |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 2075 | enable_trace_probe(tp, TP_FLAG_TRACE); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2076 | } |
| 2077 | |
| 2078 | if (warn) |
| 2079 | goto end; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2080 | |
| 2081 | ret = target(1, 2, 3, 4, 5, 6); |
| 2082 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 2083 | /* 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 Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2098 | ret = command_trace_probe("-:testprobe"); |
| 2099 | if (WARN_ON_ONCE(ret)) { |
| 2100 | pr_warning("error on deleting a probe.\n"); |
| 2101 | warn++; |
| 2102 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2103 | |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2104 | ret = command_trace_probe("-:testprobe2"); |
| 2105 | if (WARN_ON_ONCE(ret)) { |
| 2106 | pr_warning("error on deleting a probe.\n"); |
| 2107 | warn++; |
| 2108 | } |
| 2109 | |
| 2110 | end: |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 2111 | release_all_trace_probes(); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 2112 | if (warn) |
| 2113 | pr_cont("NG: Some tests are failed. Please check them.\n"); |
| 2114 | else |
| 2115 | pr_cont("OK\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 2116 | return 0; |
| 2117 | } |
| 2118 | |
| 2119 | late_initcall(kprobe_trace_self_tests_init); |
| 2120 | |
| 2121 | #endif |