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 | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 32 | |
| 33 | #include "trace.h" |
| 34 | #include "trace_output.h" |
| 35 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 36 | #define MAX_TRACE_ARGS 128 |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 37 | #define MAX_ARGSTR_LEN 63 |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 38 | #define MAX_EVENT_NAME_LEN 64 |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 39 | #define KPROBE_EVENT_SYSTEM "kprobes" |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 40 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 41 | /* Reserved field names */ |
Masami Hiramatsu | e93f4d8 | 2009-10-07 18:28:14 -0400 | [diff] [blame] | 42 | #define FIELD_STRING_IP "__probe_ip" |
| 43 | #define FIELD_STRING_NARGS "__probe_nargs" |
| 44 | #define FIELD_STRING_RETIP "__probe_ret_ip" |
| 45 | #define FIELD_STRING_FUNC "__probe_func" |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 46 | |
| 47 | const char *reserved_field_names[] = { |
| 48 | "common_type", |
| 49 | "common_flags", |
| 50 | "common_preempt_count", |
| 51 | "common_pid", |
| 52 | "common_tgid", |
| 53 | "common_lock_depth", |
| 54 | FIELD_STRING_IP, |
| 55 | FIELD_STRING_NARGS, |
| 56 | FIELD_STRING_RETIP, |
| 57 | FIELD_STRING_FUNC, |
| 58 | }; |
| 59 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 60 | struct fetch_func { |
| 61 | unsigned long (*func)(struct pt_regs *, void *); |
| 62 | void *data; |
| 63 | }; |
| 64 | |
| 65 | static __kprobes unsigned long call_fetch(struct fetch_func *f, |
| 66 | struct pt_regs *regs) |
| 67 | { |
| 68 | return f->func(regs, f->data); |
| 69 | } |
| 70 | |
| 71 | /* fetch handlers */ |
| 72 | static __kprobes unsigned long fetch_register(struct pt_regs *regs, |
| 73 | void *offset) |
| 74 | { |
| 75 | return regs_get_register(regs, (unsigned int)((unsigned long)offset)); |
| 76 | } |
| 77 | |
| 78 | static __kprobes unsigned long fetch_stack(struct pt_regs *regs, |
| 79 | void *num) |
| 80 | { |
| 81 | return regs_get_kernel_stack_nth(regs, |
| 82 | (unsigned int)((unsigned long)num)); |
| 83 | } |
| 84 | |
| 85 | static __kprobes unsigned long fetch_memory(struct pt_regs *regs, void *addr) |
| 86 | { |
| 87 | unsigned long retval; |
| 88 | |
| 89 | if (probe_kernel_address(addr, retval)) |
| 90 | return 0; |
| 91 | return retval; |
| 92 | } |
| 93 | |
| 94 | static __kprobes unsigned long fetch_argument(struct pt_regs *regs, void *num) |
| 95 | { |
| 96 | return regs_get_argument_nth(regs, (unsigned int)((unsigned long)num)); |
| 97 | } |
| 98 | |
| 99 | static __kprobes unsigned long fetch_retvalue(struct pt_regs *regs, |
| 100 | void *dummy) |
| 101 | { |
| 102 | return regs_return_value(regs); |
| 103 | } |
| 104 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 105 | static __kprobes unsigned long fetch_stack_address(struct pt_regs *regs, |
| 106 | void *dummy) |
| 107 | { |
| 108 | return kernel_stack_pointer(regs); |
| 109 | } |
| 110 | |
| 111 | /* Memory fetching by symbol */ |
| 112 | struct symbol_cache { |
| 113 | char *symbol; |
| 114 | long offset; |
| 115 | unsigned long addr; |
| 116 | }; |
| 117 | |
| 118 | static unsigned long update_symbol_cache(struct symbol_cache *sc) |
| 119 | { |
| 120 | sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol); |
| 121 | if (sc->addr) |
| 122 | sc->addr += sc->offset; |
| 123 | return sc->addr; |
| 124 | } |
| 125 | |
| 126 | static void free_symbol_cache(struct symbol_cache *sc) |
| 127 | { |
| 128 | kfree(sc->symbol); |
| 129 | kfree(sc); |
| 130 | } |
| 131 | |
| 132 | static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset) |
| 133 | { |
| 134 | struct symbol_cache *sc; |
| 135 | |
| 136 | if (!sym || strlen(sym) == 0) |
| 137 | return NULL; |
| 138 | sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL); |
| 139 | if (!sc) |
| 140 | return NULL; |
| 141 | |
| 142 | sc->symbol = kstrdup(sym, GFP_KERNEL); |
| 143 | if (!sc->symbol) { |
| 144 | kfree(sc); |
| 145 | return NULL; |
| 146 | } |
| 147 | sc->offset = offset; |
| 148 | |
| 149 | update_symbol_cache(sc); |
| 150 | return sc; |
| 151 | } |
| 152 | |
| 153 | static __kprobes unsigned long fetch_symbol(struct pt_regs *regs, void *data) |
| 154 | { |
| 155 | struct symbol_cache *sc = data; |
| 156 | |
| 157 | if (sc->addr) |
| 158 | return fetch_memory(regs, (void *)sc->addr); |
| 159 | else |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | /* Special indirect memory access interface */ |
| 164 | struct indirect_fetch_data { |
| 165 | struct fetch_func orig; |
| 166 | long offset; |
| 167 | }; |
| 168 | |
| 169 | static __kprobes unsigned long fetch_indirect(struct pt_regs *regs, void *data) |
| 170 | { |
| 171 | struct indirect_fetch_data *ind = data; |
| 172 | unsigned long addr; |
| 173 | |
| 174 | addr = call_fetch(&ind->orig, regs); |
| 175 | if (addr) { |
| 176 | addr += ind->offset; |
| 177 | return fetch_memory(regs, (void *)addr); |
| 178 | } else |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static __kprobes void free_indirect_fetch_data(struct indirect_fetch_data *data) |
| 183 | { |
| 184 | if (data->orig.func == fetch_indirect) |
| 185 | free_indirect_fetch_data(data->orig.data); |
| 186 | else if (data->orig.func == fetch_symbol) |
| 187 | free_symbol_cache(data->orig.data); |
| 188 | kfree(data); |
| 189 | } |
| 190 | |
| 191 | /** |
Masami Hiramatsu | 77b44d1 | 2009-11-03 19:12:47 -0500 | [diff] [blame] | 192 | * Kprobe event core functions |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 193 | */ |
| 194 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 195 | struct probe_arg { |
| 196 | struct fetch_func fetch; |
| 197 | const char *name; |
| 198 | }; |
| 199 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 200 | /* Flags for trace_probe */ |
| 201 | #define TP_FLAG_TRACE 1 |
| 202 | #define TP_FLAG_PROFILE 2 |
| 203 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 204 | struct trace_probe { |
| 205 | struct list_head list; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 206 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 207 | unsigned long nhit; |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 208 | unsigned int flags; /* For TP_FLAG_* */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 209 | const char *symbol; /* symbol name */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 210 | struct ftrace_event_call call; |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 211 | struct trace_event event; |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 212 | unsigned int nr_args; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 213 | struct probe_arg args[]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 214 | }; |
| 215 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 216 | #define SIZEOF_TRACE_PROBE(n) \ |
| 217 | (offsetof(struct trace_probe, args) + \ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 218 | (sizeof(struct probe_arg) * (n))) |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 219 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 220 | static __kprobes int probe_is_return(struct trace_probe *tp) |
| 221 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 222 | return tp->rp.handler != NULL; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | static __kprobes const char *probe_symbol(struct trace_probe *tp) |
| 226 | { |
| 227 | return tp->symbol ? tp->symbol : "unknown"; |
| 228 | } |
| 229 | |
Masami Hiramatsu | 30a7e07 | 2009-08-21 15:43:51 -0400 | [diff] [blame] | 230 | static int probe_arg_string(char *buf, size_t n, struct fetch_func *ff) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 231 | { |
| 232 | int ret = -EINVAL; |
| 233 | |
| 234 | if (ff->func == fetch_argument) |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 235 | ret = snprintf(buf, n, "$arg%lu", (unsigned long)ff->data); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 236 | else if (ff->func == fetch_register) { |
| 237 | const char *name; |
| 238 | name = regs_query_register_name((unsigned int)((long)ff->data)); |
| 239 | ret = snprintf(buf, n, "%%%s", name); |
| 240 | } else if (ff->func == fetch_stack) |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 241 | ret = snprintf(buf, n, "$stack%lu", (unsigned long)ff->data); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 242 | else if (ff->func == fetch_memory) |
| 243 | ret = snprintf(buf, n, "@0x%p", ff->data); |
| 244 | else if (ff->func == fetch_symbol) { |
| 245 | struct symbol_cache *sc = ff->data; |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 246 | if (sc->offset) |
| 247 | ret = snprintf(buf, n, "@%s%+ld", sc->symbol, |
| 248 | sc->offset); |
| 249 | else |
| 250 | ret = snprintf(buf, n, "@%s", sc->symbol); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 251 | } else if (ff->func == fetch_retvalue) |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 252 | ret = snprintf(buf, n, "$retval"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 253 | else if (ff->func == fetch_stack_address) |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 254 | ret = snprintf(buf, n, "$stack"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 255 | else if (ff->func == fetch_indirect) { |
| 256 | struct indirect_fetch_data *id = ff->data; |
| 257 | size_t l = 0; |
| 258 | ret = snprintf(buf, n, "%+ld(", id->offset); |
| 259 | if (ret >= n) |
| 260 | goto end; |
| 261 | l += ret; |
Masami Hiramatsu | 30a7e07 | 2009-08-21 15:43:51 -0400 | [diff] [blame] | 262 | ret = probe_arg_string(buf + l, n - l, &id->orig); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 263 | if (ret < 0) |
| 264 | goto end; |
| 265 | l += ret; |
| 266 | ret = snprintf(buf + l, n - l, ")"); |
| 267 | ret += l; |
| 268 | } |
| 269 | end: |
| 270 | if (ret >= n) |
| 271 | return -ENOSPC; |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | static int register_probe_event(struct trace_probe *tp); |
| 276 | static void unregister_probe_event(struct trace_probe *tp); |
| 277 | |
| 278 | static DEFINE_MUTEX(probe_lock); |
| 279 | static LIST_HEAD(probe_list); |
| 280 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 281 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
| 282 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, |
| 283 | struct pt_regs *regs); |
| 284 | |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 285 | /* |
| 286 | * Allocate new trace_probe and initialize it (including kprobes). |
| 287 | */ |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 288 | static struct trace_probe *alloc_trace_probe(const char *group, |
| 289 | const char *event, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 290 | void *addr, |
| 291 | const char *symbol, |
| 292 | unsigned long offs, |
| 293 | int nargs, int is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 294 | { |
| 295 | struct trace_probe *tp; |
| 296 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 297 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 298 | if (!tp) |
| 299 | return ERR_PTR(-ENOMEM); |
| 300 | |
| 301 | if (symbol) { |
| 302 | tp->symbol = kstrdup(symbol, GFP_KERNEL); |
| 303 | if (!tp->symbol) |
| 304 | goto error; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 305 | tp->rp.kp.symbol_name = tp->symbol; |
| 306 | tp->rp.kp.offset = offs; |
| 307 | } else |
| 308 | tp->rp.kp.addr = addr; |
| 309 | |
| 310 | if (is_return) |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 311 | tp->rp.handler = kretprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 312 | else |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 313 | tp->rp.kp.pre_handler = kprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 314 | |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 315 | if (!event) |
| 316 | goto error; |
| 317 | tp->call.name = kstrdup(event, GFP_KERNEL); |
| 318 | if (!tp->call.name) |
| 319 | goto error; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 320 | |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 321 | if (!group) |
| 322 | goto error; |
| 323 | tp->call.system = kstrdup(group, GFP_KERNEL); |
| 324 | if (!tp->call.system) |
| 325 | goto error; |
| 326 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 327 | INIT_LIST_HEAD(&tp->list); |
| 328 | return tp; |
| 329 | error: |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 330 | kfree(tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 331 | kfree(tp->symbol); |
| 332 | kfree(tp); |
| 333 | return ERR_PTR(-ENOMEM); |
| 334 | } |
| 335 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 336 | static void free_probe_arg(struct probe_arg *arg) |
| 337 | { |
| 338 | if (arg->fetch.func == fetch_symbol) |
| 339 | free_symbol_cache(arg->fetch.data); |
| 340 | else if (arg->fetch.func == fetch_indirect) |
| 341 | free_indirect_fetch_data(arg->fetch.data); |
| 342 | kfree(arg->name); |
| 343 | } |
| 344 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 345 | static void free_trace_probe(struct trace_probe *tp) |
| 346 | { |
| 347 | int i; |
| 348 | |
| 349 | for (i = 0; i < tp->nr_args; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 350 | free_probe_arg(&tp->args[i]); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 351 | |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 352 | kfree(tp->call.system); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 353 | kfree(tp->call.name); |
| 354 | kfree(tp->symbol); |
| 355 | kfree(tp); |
| 356 | } |
| 357 | |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 358 | static struct trace_probe *find_probe_event(const char *event, |
| 359 | const char *group) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 360 | { |
| 361 | struct trace_probe *tp; |
| 362 | |
| 363 | list_for_each_entry(tp, &probe_list, list) |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 364 | if (strcmp(tp->call.name, event) == 0 && |
| 365 | strcmp(tp->call.system, group) == 0) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 366 | return tp; |
| 367 | return NULL; |
| 368 | } |
| 369 | |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 370 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ |
| 371 | static void unregister_trace_probe(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 372 | { |
| 373 | if (probe_is_return(tp)) |
| 374 | unregister_kretprobe(&tp->rp); |
| 375 | else |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 376 | unregister_kprobe(&tp->rp.kp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 377 | list_del(&tp->list); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 378 | unregister_probe_event(tp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | /* Register a trace_probe and probe_event */ |
| 382 | static int register_trace_probe(struct trace_probe *tp) |
| 383 | { |
| 384 | struct trace_probe *old_tp; |
| 385 | int ret; |
| 386 | |
| 387 | mutex_lock(&probe_lock); |
| 388 | |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 389 | /* register as an event */ |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 390 | old_tp = find_probe_event(tp->call.name, tp->call.system); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 391 | if (old_tp) { |
| 392 | /* delete old event */ |
| 393 | unregister_trace_probe(old_tp); |
| 394 | free_trace_probe(old_tp); |
| 395 | } |
| 396 | ret = register_probe_event(tp); |
| 397 | if (ret) { |
| 398 | pr_warning("Faild to register probe event(%d)\n", ret); |
| 399 | goto end; |
| 400 | } |
| 401 | |
Masami Hiramatsu | 5a0d905 | 2009-09-14 16:49:37 -0400 | [diff] [blame] | 402 | tp->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 403 | if (probe_is_return(tp)) |
| 404 | ret = register_kretprobe(&tp->rp); |
| 405 | else |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 406 | ret = register_kprobe(&tp->rp.kp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 407 | |
| 408 | if (ret) { |
| 409 | pr_warning("Could not insert probe(%d)\n", ret); |
| 410 | if (ret == -EILSEQ) { |
| 411 | pr_warning("Probing address(0x%p) is not an " |
| 412 | "instruction boundary.\n", |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 413 | tp->rp.kp.addr); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 414 | ret = -EINVAL; |
| 415 | } |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 416 | unregister_probe_event(tp); |
| 417 | } else |
| 418 | list_add_tail(&tp->list, &probe_list); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 419 | end: |
| 420 | mutex_unlock(&probe_lock); |
| 421 | return ret; |
| 422 | } |
| 423 | |
| 424 | /* Split symbol and offset. */ |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 425 | static int split_symbol_offset(char *symbol, unsigned long *offset) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 426 | { |
| 427 | char *tmp; |
| 428 | int ret; |
| 429 | |
| 430 | if (!offset) |
| 431 | return -EINVAL; |
| 432 | |
| 433 | tmp = strchr(symbol, '+'); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 434 | if (tmp) { |
| 435 | /* skip sign because strict_strtol doesn't accept '+' */ |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 436 | ret = strict_strtoul(tmp + 1, 0, offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 437 | if (ret) |
| 438 | return ret; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 439 | *tmp = '\0'; |
| 440 | } else |
| 441 | *offset = 0; |
| 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | #define PARAM_MAX_ARGS 16 |
| 446 | #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long)) |
| 447 | |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 448 | static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 449 | { |
| 450 | int ret = 0; |
| 451 | unsigned long param; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 452 | |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 453 | if (strcmp(arg, "retval") == 0) { |
| 454 | if (is_return) { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 455 | ff->func = fetch_retvalue; |
| 456 | ff->data = NULL; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 457 | } else |
| 458 | ret = -EINVAL; |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 459 | } else if (strncmp(arg, "stack", 5) == 0) { |
| 460 | if (arg[5] == '\0') { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 461 | ff->func = fetch_stack_address; |
| 462 | ff->data = NULL; |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 463 | } else if (isdigit(arg[5])) { |
| 464 | ret = strict_strtoul(arg + 5, 10, ¶m); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 465 | if (ret || param > PARAM_MAX_STACK) |
| 466 | ret = -EINVAL; |
| 467 | else { |
| 468 | ff->func = fetch_stack; |
| 469 | ff->data = (void *)param; |
| 470 | } |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 471 | } else |
| 472 | ret = -EINVAL; |
| 473 | } else if (strncmp(arg, "arg", 3) == 0 && isdigit(arg[3])) { |
| 474 | ret = strict_strtoul(arg + 3, 10, ¶m); |
| 475 | if (ret || param > PARAM_MAX_ARGS) |
| 476 | ret = -EINVAL; |
| 477 | else { |
| 478 | ff->func = fetch_argument; |
| 479 | ff->data = (void *)param; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 480 | } |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 481 | } else |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 482 | ret = -EINVAL; |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 483 | return ret; |
| 484 | } |
| 485 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame^] | 486 | /* Recursive argument parser */ |
| 487 | static int __parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 488 | { |
| 489 | int ret = 0; |
| 490 | unsigned long param; |
| 491 | long offset; |
| 492 | char *tmp; |
| 493 | |
| 494 | switch (arg[0]) { |
| 495 | case '$': |
| 496 | ret = parse_probe_vars(arg + 1, ff, is_return); |
| 497 | break; |
| 498 | case '%': /* named register */ |
| 499 | ret = regs_query_register_offset(arg + 1); |
| 500 | if (ret >= 0) { |
| 501 | ff->func = fetch_register; |
| 502 | ff->data = (void *)(unsigned long)ret; |
| 503 | ret = 0; |
| 504 | } |
| 505 | break; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 506 | case '@': /* memory or symbol */ |
| 507 | if (isdigit(arg[1])) { |
| 508 | ret = strict_strtoul(arg + 1, 0, ¶m); |
| 509 | if (ret) |
| 510 | break; |
| 511 | ff->func = fetch_memory; |
| 512 | ff->data = (void *)param; |
| 513 | } else { |
| 514 | ret = split_symbol_offset(arg + 1, &offset); |
| 515 | if (ret) |
| 516 | break; |
Masami Hiramatsu | 405b265 | 2009-10-07 18:27:40 -0400 | [diff] [blame] | 517 | ff->data = alloc_symbol_cache(arg + 1, offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 518 | if (ff->data) |
| 519 | ff->func = fetch_symbol; |
| 520 | else |
| 521 | ret = -EINVAL; |
| 522 | } |
| 523 | break; |
| 524 | case '+': /* indirect memory */ |
| 525 | case '-': |
| 526 | tmp = strchr(arg, '('); |
| 527 | if (!tmp) { |
| 528 | ret = -EINVAL; |
| 529 | break; |
| 530 | } |
| 531 | *tmp = '\0'; |
| 532 | ret = strict_strtol(arg + 1, 0, &offset); |
| 533 | if (ret) |
| 534 | break; |
| 535 | if (arg[0] == '-') |
| 536 | offset = -offset; |
| 537 | arg = tmp + 1; |
| 538 | tmp = strrchr(arg, ')'); |
| 539 | if (tmp) { |
| 540 | struct indirect_fetch_data *id; |
| 541 | *tmp = '\0'; |
| 542 | id = kzalloc(sizeof(struct indirect_fetch_data), |
| 543 | GFP_KERNEL); |
| 544 | if (!id) |
| 545 | return -ENOMEM; |
| 546 | id->offset = offset; |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame^] | 547 | ret = __parse_probe_arg(arg, &id->orig, is_return); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 548 | if (ret) |
| 549 | kfree(id); |
| 550 | else { |
| 551 | ff->func = fetch_indirect; |
| 552 | ff->data = (void *)id; |
| 553 | } |
| 554 | } else |
| 555 | ret = -EINVAL; |
| 556 | break; |
| 557 | default: |
| 558 | /* TODO: support custom handler */ |
| 559 | ret = -EINVAL; |
| 560 | } |
| 561 | return ret; |
| 562 | } |
| 563 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame^] | 564 | /* String length checking wrapper */ |
| 565 | static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return) |
| 566 | { |
| 567 | if (strlen(arg) > MAX_ARGSTR_LEN) { |
| 568 | pr_info("Argument is too long.: %s\n", arg); |
| 569 | return -ENOSPC; |
| 570 | } |
| 571 | return __parse_probe_arg(arg, ff, is_return); |
| 572 | } |
| 573 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 574 | /* Return 1 if name is reserved or already used by another argument */ |
| 575 | static int conflict_field_name(const char *name, |
| 576 | struct probe_arg *args, int narg) |
| 577 | { |
| 578 | int i; |
| 579 | for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++) |
| 580 | if (strcmp(reserved_field_names[i], name) == 0) |
| 581 | return 1; |
| 582 | for (i = 0; i < narg; i++) |
| 583 | if (strcmp(args[i].name, name) == 0) |
| 584 | return 1; |
| 585 | return 0; |
| 586 | } |
| 587 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 588 | static int create_trace_probe(int argc, char **argv) |
| 589 | { |
| 590 | /* |
| 591 | * Argument syntax: |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 592 | * - Add kprobe: p[:[GRP/]EVENT] KSYM[+OFFS]|KADDR [FETCHARGS] |
| 593 | * - Add kretprobe: r[:[GRP/]EVENT] KSYM[+0] [FETCHARGS] |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 594 | * Fetch args: |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 595 | * $argN : fetch Nth of function argument. (N:0-) |
| 596 | * $retval : fetch return value |
| 597 | * $stack : fetch stack address |
| 598 | * $stackN : fetch Nth of stack (N:0-) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 599 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
| 600 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) |
| 601 | * %REG : fetch register REG |
| 602 | * Indirect memory fetch: |
| 603 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 604 | * Alias name of args: |
| 605 | * NAME=FETCHARG : set NAME as alias of FETCHARG. |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 606 | */ |
| 607 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 608 | int i, ret = 0; |
| 609 | int is_return = 0; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 610 | char *symbol = NULL, *event = NULL, *arg = NULL, *group = NULL; |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 611 | unsigned long offset = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 612 | void *addr = NULL; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 613 | char buf[MAX_EVENT_NAME_LEN]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 614 | |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 615 | if (argc < 2) { |
| 616 | pr_info("Probe point is not specified.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 617 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 618 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 619 | |
| 620 | if (argv[0][0] == 'p') |
| 621 | is_return = 0; |
| 622 | else if (argv[0][0] == 'r') |
| 623 | is_return = 1; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 624 | else { |
| 625 | pr_info("Probe definition must be started with 'p' or 'r'.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 626 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 627 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 628 | |
| 629 | if (argv[0][1] == ':') { |
| 630 | event = &argv[0][2]; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 631 | if (strchr(event, '/')) { |
| 632 | group = event; |
| 633 | event = strchr(group, '/') + 1; |
| 634 | event[-1] = '\0'; |
| 635 | if (strlen(group) == 0) { |
| 636 | pr_info("Group name is not specifiled\n"); |
| 637 | return -EINVAL; |
| 638 | } |
| 639 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 640 | if (strlen(event) == 0) { |
| 641 | pr_info("Event name is not specifiled\n"); |
| 642 | return -EINVAL; |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | if (isdigit(argv[1][0])) { |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 647 | if (is_return) { |
| 648 | pr_info("Return probe point must be a symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 649 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 650 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 651 | /* an address specified */ |
| 652 | ret = strict_strtoul(&argv[0][2], 0, (unsigned long *)&addr); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 653 | if (ret) { |
| 654 | pr_info("Failed to parse address.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 655 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 656 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 657 | } else { |
| 658 | /* a symbol specified */ |
| 659 | symbol = argv[1]; |
| 660 | /* TODO: support .init module functions */ |
| 661 | ret = split_symbol_offset(symbol, &offset); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 662 | if (ret) { |
| 663 | pr_info("Failed to parse symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 664 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 665 | } |
| 666 | if (offset && is_return) { |
| 667 | pr_info("Return probe must be used without offset.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 668 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 669 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 670 | } |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 671 | argc -= 2; argv += 2; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 672 | |
| 673 | /* setup a probe */ |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 674 | if (!group) |
| 675 | group = KPROBE_EVENT_SYSTEM; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 676 | if (!event) { |
| 677 | /* Make a new event name */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 678 | if (symbol) |
| 679 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c@%s%+ld", |
| 680 | is_return ? 'r' : 'p', symbol, offset); |
| 681 | else |
| 682 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c@0x%p", |
| 683 | is_return ? 'r' : 'p', addr); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 684 | event = buf; |
| 685 | } |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 686 | tp = alloc_trace_probe(group, event, addr, symbol, offset, argc, |
| 687 | is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 688 | if (IS_ERR(tp)) { |
| 689 | pr_info("Failed to allocate trace_probe.(%d)\n", |
| 690 | (int)PTR_ERR(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 691 | return PTR_ERR(tp); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 692 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 693 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 694 | /* parse arguments */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 695 | ret = 0; |
| 696 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 697 | /* Parse argument name */ |
| 698 | arg = strchr(argv[i], '='); |
| 699 | if (arg) |
| 700 | *arg++ = '\0'; |
| 701 | else |
| 702 | arg = argv[i]; |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 703 | |
| 704 | if (conflict_field_name(argv[i], tp->args, i)) { |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 705 | pr_info("Argument%d name '%s' conflicts with " |
| 706 | "another field.\n", i, argv[i]); |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 707 | ret = -EINVAL; |
| 708 | goto error; |
| 709 | } |
| 710 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 711 | tp->args[i].name = kstrdup(argv[i], GFP_KERNEL); |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame^] | 712 | if (!tp->args[i].name) { |
| 713 | pr_info("Failed to allocate argument%d name '%s'.\n", |
| 714 | i, argv[i]); |
| 715 | ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 716 | goto error; |
| 717 | } |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame^] | 718 | |
| 719 | /* Parse fetch argument */ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 720 | ret = parse_probe_arg(arg, &tp->args[i].fetch, is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 721 | if (ret) { |
| 722 | pr_info("Parse error at argument%d. (%d)\n", i, ret); |
Lai Jiangshan | abab9d3 | 2009-11-25 16:32:21 +0800 | [diff] [blame] | 723 | kfree(tp->args[i].name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 724 | goto error; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 725 | } |
Lai Jiangshan | abab9d3 | 2009-11-25 16:32:21 +0800 | [diff] [blame] | 726 | |
| 727 | tp->nr_args++; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 728 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 729 | |
| 730 | ret = register_trace_probe(tp); |
| 731 | if (ret) |
| 732 | goto error; |
| 733 | return 0; |
| 734 | |
| 735 | error: |
| 736 | free_trace_probe(tp); |
| 737 | return ret; |
| 738 | } |
| 739 | |
| 740 | static void cleanup_all_probes(void) |
| 741 | { |
| 742 | struct trace_probe *tp; |
| 743 | |
| 744 | mutex_lock(&probe_lock); |
| 745 | /* TODO: Use batch unregistration */ |
| 746 | while (!list_empty(&probe_list)) { |
| 747 | tp = list_entry(probe_list.next, struct trace_probe, list); |
| 748 | unregister_trace_probe(tp); |
| 749 | free_trace_probe(tp); |
| 750 | } |
| 751 | mutex_unlock(&probe_lock); |
| 752 | } |
| 753 | |
| 754 | |
| 755 | /* Probes listing interfaces */ |
| 756 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) |
| 757 | { |
| 758 | mutex_lock(&probe_lock); |
| 759 | return seq_list_start(&probe_list, *pos); |
| 760 | } |
| 761 | |
| 762 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 763 | { |
| 764 | return seq_list_next(v, &probe_list, pos); |
| 765 | } |
| 766 | |
| 767 | static void probes_seq_stop(struct seq_file *m, void *v) |
| 768 | { |
| 769 | mutex_unlock(&probe_lock); |
| 770 | } |
| 771 | |
| 772 | static int probes_seq_show(struct seq_file *m, void *v) |
| 773 | { |
| 774 | struct trace_probe *tp = v; |
| 775 | int i, ret; |
| 776 | char buf[MAX_ARGSTR_LEN + 1]; |
| 777 | |
| 778 | seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p'); |
Lai Jiangshan | 3d9b2e1 | 2009-11-25 16:32:47 +0800 | [diff] [blame] | 779 | seq_printf(m, ":%s/%s", tp->call.system, tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 780 | |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 781 | if (!tp->symbol) |
| 782 | seq_printf(m, " 0x%p", tp->rp.kp.addr); |
| 783 | else if (tp->rp.kp.offset) |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 784 | seq_printf(m, " %s+%u", probe_symbol(tp), tp->rp.kp.offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 785 | else |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 786 | seq_printf(m, " %s", probe_symbol(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 787 | |
| 788 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 789 | ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i].fetch); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 790 | if (ret < 0) { |
| 791 | pr_warning("Argument%d decoding error(%d).\n", i, ret); |
| 792 | return ret; |
| 793 | } |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 794 | seq_printf(m, " %s=%s", tp->args[i].name, buf); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 795 | } |
| 796 | seq_printf(m, "\n"); |
| 797 | return 0; |
| 798 | } |
| 799 | |
| 800 | static const struct seq_operations probes_seq_op = { |
| 801 | .start = probes_seq_start, |
| 802 | .next = probes_seq_next, |
| 803 | .stop = probes_seq_stop, |
| 804 | .show = probes_seq_show |
| 805 | }; |
| 806 | |
| 807 | static int probes_open(struct inode *inode, struct file *file) |
| 808 | { |
| 809 | if ((file->f_mode & FMODE_WRITE) && |
| 810 | (file->f_flags & O_TRUNC)) |
| 811 | cleanup_all_probes(); |
| 812 | |
| 813 | return seq_open(file, &probes_seq_op); |
| 814 | } |
| 815 | |
| 816 | static int command_trace_probe(const char *buf) |
| 817 | { |
| 818 | char **argv; |
| 819 | int argc = 0, ret = 0; |
| 820 | |
| 821 | argv = argv_split(GFP_KERNEL, buf, &argc); |
| 822 | if (!argv) |
| 823 | return -ENOMEM; |
| 824 | |
| 825 | if (argc) |
| 826 | ret = create_trace_probe(argc, argv); |
| 827 | |
| 828 | argv_free(argv); |
| 829 | return ret; |
| 830 | } |
| 831 | |
| 832 | #define WRITE_BUFSIZE 128 |
| 833 | |
| 834 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
| 835 | size_t count, loff_t *ppos) |
| 836 | { |
| 837 | char *kbuf, *tmp; |
| 838 | int ret; |
| 839 | size_t done; |
| 840 | size_t size; |
| 841 | |
| 842 | kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); |
| 843 | if (!kbuf) |
| 844 | return -ENOMEM; |
| 845 | |
| 846 | ret = done = 0; |
| 847 | while (done < count) { |
| 848 | size = count - done; |
| 849 | if (size >= WRITE_BUFSIZE) |
| 850 | size = WRITE_BUFSIZE - 1; |
| 851 | if (copy_from_user(kbuf, buffer + done, size)) { |
| 852 | ret = -EFAULT; |
| 853 | goto out; |
| 854 | } |
| 855 | kbuf[size] = '\0'; |
| 856 | tmp = strchr(kbuf, '\n'); |
| 857 | if (tmp) { |
| 858 | *tmp = '\0'; |
| 859 | size = tmp - kbuf + 1; |
| 860 | } else if (done + size < count) { |
| 861 | pr_warning("Line length is too long: " |
| 862 | "Should be less than %d.", WRITE_BUFSIZE); |
| 863 | ret = -EINVAL; |
| 864 | goto out; |
| 865 | } |
| 866 | done += size; |
| 867 | /* Remove comments */ |
| 868 | tmp = strchr(kbuf, '#'); |
| 869 | if (tmp) |
| 870 | *tmp = '\0'; |
| 871 | |
| 872 | ret = command_trace_probe(kbuf); |
| 873 | if (ret) |
| 874 | goto out; |
| 875 | } |
| 876 | ret = done; |
| 877 | out: |
| 878 | kfree(kbuf); |
| 879 | return ret; |
| 880 | } |
| 881 | |
| 882 | static const struct file_operations kprobe_events_ops = { |
| 883 | .owner = THIS_MODULE, |
| 884 | .open = probes_open, |
| 885 | .read = seq_read, |
| 886 | .llseek = seq_lseek, |
| 887 | .release = seq_release, |
| 888 | .write = probes_write, |
| 889 | }; |
| 890 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 891 | /* Probes profiling interfaces */ |
| 892 | static int probes_profile_seq_show(struct seq_file *m, void *v) |
| 893 | { |
| 894 | struct trace_probe *tp = v; |
| 895 | |
| 896 | seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 897 | tp->rp.kp.nmissed); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 898 | |
| 899 | return 0; |
| 900 | } |
| 901 | |
| 902 | static const struct seq_operations profile_seq_op = { |
| 903 | .start = probes_seq_start, |
| 904 | .next = probes_seq_next, |
| 905 | .stop = probes_seq_stop, |
| 906 | .show = probes_profile_seq_show |
| 907 | }; |
| 908 | |
| 909 | static int profile_open(struct inode *inode, struct file *file) |
| 910 | { |
| 911 | return seq_open(file, &profile_seq_op); |
| 912 | } |
| 913 | |
| 914 | static const struct file_operations kprobe_profile_ops = { |
| 915 | .owner = THIS_MODULE, |
| 916 | .open = profile_open, |
| 917 | .read = seq_read, |
| 918 | .llseek = seq_lseek, |
| 919 | .release = seq_release, |
| 920 | }; |
| 921 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 922 | /* Kprobe handler */ |
| 923 | static __kprobes int kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs) |
| 924 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 925 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 926 | struct kprobe_trace_entry *entry; |
| 927 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 928 | struct ring_buffer *buffer; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 929 | int size, i, pc; |
| 930 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 931 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 932 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 933 | tp->nhit++; |
| 934 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 935 | local_save_flags(irq_flags); |
| 936 | pc = preempt_count(); |
| 937 | |
| 938 | size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args); |
| 939 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 940 | event = trace_current_buffer_lock_reserve(&buffer, call->id, size, |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 941 | irq_flags, pc); |
| 942 | if (!event) |
| 943 | return 0; |
| 944 | |
| 945 | entry = ring_buffer_event_data(event); |
| 946 | entry->nargs = tp->nr_args; |
| 947 | entry->ip = (unsigned long)kp->addr; |
| 948 | for (i = 0; i < tp->nr_args; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 949 | entry->args[i] = call_fetch(&tp->args[i].fetch, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 950 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 951 | if (!filter_current_check_discard(buffer, call, entry, event)) |
| 952 | trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 953 | return 0; |
| 954 | } |
| 955 | |
| 956 | /* Kretprobe handler */ |
| 957 | static __kprobes int kretprobe_trace_func(struct kretprobe_instance *ri, |
| 958 | struct pt_regs *regs) |
| 959 | { |
| 960 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 961 | struct kretprobe_trace_entry *entry; |
| 962 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 963 | struct ring_buffer *buffer; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 964 | int size, i, pc; |
| 965 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 966 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 967 | |
| 968 | local_save_flags(irq_flags); |
| 969 | pc = preempt_count(); |
| 970 | |
| 971 | size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args); |
| 972 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 973 | event = trace_current_buffer_lock_reserve(&buffer, call->id, size, |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 974 | irq_flags, pc); |
| 975 | if (!event) |
| 976 | return 0; |
| 977 | |
| 978 | entry = ring_buffer_event_data(event); |
| 979 | entry->nargs = tp->nr_args; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 980 | entry->func = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 981 | entry->ret_ip = (unsigned long)ri->ret_addr; |
| 982 | for (i = 0; i < tp->nr_args; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 983 | entry->args[i] = call_fetch(&tp->args[i].fetch, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 984 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 985 | if (!filter_current_check_discard(buffer, call, entry, event)) |
| 986 | trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 987 | |
| 988 | return 0; |
| 989 | } |
| 990 | |
| 991 | /* Event entry printers */ |
| 992 | enum print_line_t |
| 993 | print_kprobe_event(struct trace_iterator *iter, int flags) |
| 994 | { |
| 995 | struct kprobe_trace_entry *field; |
| 996 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 997 | struct trace_event *event; |
| 998 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 999 | int i; |
| 1000 | |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1001 | field = (struct kprobe_trace_entry *)iter->ent; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1002 | event = ftrace_find_event(field->ent.type); |
| 1003 | tp = container_of(event, struct trace_probe, event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1004 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1005 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 1006 | goto partial; |
| 1007 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1008 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 1009 | goto partial; |
| 1010 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1011 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1012 | goto partial; |
| 1013 | |
| 1014 | for (i = 0; i < field->nargs; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1015 | if (!trace_seq_printf(s, " %s=%lx", |
| 1016 | tp->args[i].name, field->args[i])) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1017 | goto partial; |
| 1018 | |
| 1019 | if (!trace_seq_puts(s, "\n")) |
| 1020 | goto partial; |
| 1021 | |
| 1022 | return TRACE_TYPE_HANDLED; |
| 1023 | partial: |
| 1024 | return TRACE_TYPE_PARTIAL_LINE; |
| 1025 | } |
| 1026 | |
| 1027 | enum print_line_t |
| 1028 | print_kretprobe_event(struct trace_iterator *iter, int flags) |
| 1029 | { |
| 1030 | struct kretprobe_trace_entry *field; |
| 1031 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1032 | struct trace_event *event; |
| 1033 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1034 | int i; |
| 1035 | |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1036 | field = (struct kretprobe_trace_entry *)iter->ent; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1037 | event = ftrace_find_event(field->ent.type); |
| 1038 | tp = container_of(event, struct trace_probe, event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1039 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1040 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 1041 | goto partial; |
| 1042 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1043 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 1044 | goto partial; |
| 1045 | |
| 1046 | if (!trace_seq_puts(s, " <- ")) |
| 1047 | goto partial; |
| 1048 | |
| 1049 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) |
| 1050 | goto partial; |
| 1051 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1052 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1053 | goto partial; |
| 1054 | |
| 1055 | for (i = 0; i < field->nargs; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1056 | if (!trace_seq_printf(s, " %s=%lx", |
| 1057 | tp->args[i].name, field->args[i])) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1058 | goto partial; |
| 1059 | |
| 1060 | if (!trace_seq_puts(s, "\n")) |
| 1061 | goto partial; |
| 1062 | |
| 1063 | return TRACE_TYPE_HANDLED; |
| 1064 | partial: |
| 1065 | return TRACE_TYPE_PARTIAL_LINE; |
| 1066 | } |
| 1067 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1068 | static int probe_event_enable(struct ftrace_event_call *call) |
| 1069 | { |
| 1070 | struct trace_probe *tp = (struct trace_probe *)call->data; |
| 1071 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1072 | tp->flags |= TP_FLAG_TRACE; |
| 1073 | if (probe_is_return(tp)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1074 | return enable_kretprobe(&tp->rp); |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1075 | else |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 1076 | return enable_kprobe(&tp->rp.kp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1077 | } |
| 1078 | |
| 1079 | static void probe_event_disable(struct ftrace_event_call *call) |
| 1080 | { |
| 1081 | struct trace_probe *tp = (struct trace_probe *)call->data; |
| 1082 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1083 | tp->flags &= ~TP_FLAG_TRACE; |
| 1084 | if (!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE))) { |
| 1085 | if (probe_is_return(tp)) |
| 1086 | disable_kretprobe(&tp->rp); |
| 1087 | else |
| 1088 | disable_kprobe(&tp->rp.kp); |
| 1089 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1090 | } |
| 1091 | |
| 1092 | static int probe_event_raw_init(struct ftrace_event_call *event_call) |
| 1093 | { |
| 1094 | INIT_LIST_HEAD(&event_call->fields); |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 1095 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1096 | return 0; |
| 1097 | } |
| 1098 | |
| 1099 | #undef DEFINE_FIELD |
| 1100 | #define DEFINE_FIELD(type, item, name, is_signed) \ |
| 1101 | do { \ |
| 1102 | ret = trace_define_field(event_call, #type, name, \ |
| 1103 | offsetof(typeof(field), item), \ |
| 1104 | sizeof(field.item), is_signed, \ |
| 1105 | FILTER_OTHER); \ |
| 1106 | if (ret) \ |
| 1107 | return ret; \ |
| 1108 | } while (0) |
| 1109 | |
| 1110 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 1111 | { |
| 1112 | int ret, i; |
| 1113 | struct kprobe_trace_entry field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1114 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 1115 | |
| 1116 | ret = trace_define_common_fields(event_call); |
| 1117 | if (!ret) |
| 1118 | return ret; |
| 1119 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1120 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
| 1121 | DEFINE_FIELD(int, nargs, FIELD_STRING_NARGS, 1); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1122 | /* Set argument names as fields */ |
| 1123 | for (i = 0; i < tp->nr_args; i++) |
| 1124 | DEFINE_FIELD(unsigned long, args[i], tp->args[i].name, 0); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1125 | return 0; |
| 1126 | } |
| 1127 | |
| 1128 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 1129 | { |
| 1130 | int ret, i; |
| 1131 | struct kretprobe_trace_entry field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1132 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 1133 | |
| 1134 | ret = trace_define_common_fields(event_call); |
| 1135 | if (!ret) |
| 1136 | return ret; |
| 1137 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1138 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
| 1139 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); |
| 1140 | DEFINE_FIELD(int, nargs, FIELD_STRING_NARGS, 1); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1141 | /* Set argument names as fields */ |
| 1142 | for (i = 0; i < tp->nr_args; i++) |
| 1143 | DEFINE_FIELD(unsigned long, args[i], tp->args[i].name, 0); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1144 | return 0; |
| 1145 | } |
| 1146 | |
| 1147 | static int __probe_event_show_format(struct trace_seq *s, |
| 1148 | struct trace_probe *tp, const char *fmt, |
| 1149 | const char *arg) |
| 1150 | { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1151 | int i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1152 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1153 | /* Show format */ |
| 1154 | if (!trace_seq_printf(s, "\nprint fmt: \"%s", fmt)) |
| 1155 | return 0; |
| 1156 | |
| 1157 | for (i = 0; i < tp->nr_args; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1158 | if (!trace_seq_printf(s, " %s=%%lx", tp->args[i].name)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1159 | return 0; |
| 1160 | |
| 1161 | if (!trace_seq_printf(s, "\", %s", arg)) |
| 1162 | return 0; |
| 1163 | |
| 1164 | for (i = 0; i < tp->nr_args; i++) |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1165 | if (!trace_seq_printf(s, ", REC->%s", tp->args[i].name)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1166 | return 0; |
| 1167 | |
| 1168 | return trace_seq_puts(s, "\n"); |
| 1169 | } |
| 1170 | |
| 1171 | #undef SHOW_FIELD |
| 1172 | #define SHOW_FIELD(type, item, name) \ |
| 1173 | do { \ |
| 1174 | ret = trace_seq_printf(s, "\tfield: " #type " %s;\t" \ |
Masami Hiramatsu | 38a4749 | 2009-08-21 15:43:43 -0400 | [diff] [blame] | 1175 | "offset:%u;\tsize:%u;\n", name, \ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1176 | (unsigned int)offsetof(typeof(field), item),\ |
| 1177 | (unsigned int)sizeof(type)); \ |
| 1178 | if (!ret) \ |
| 1179 | return 0; \ |
| 1180 | } while (0) |
| 1181 | |
| 1182 | static int kprobe_event_show_format(struct ftrace_event_call *call, |
| 1183 | struct trace_seq *s) |
| 1184 | { |
| 1185 | struct kprobe_trace_entry field __attribute__((unused)); |
| 1186 | int ret, i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1187 | struct trace_probe *tp = (struct trace_probe *)call->data; |
| 1188 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1189 | SHOW_FIELD(unsigned long, ip, FIELD_STRING_IP); |
| 1190 | SHOW_FIELD(int, nargs, FIELD_STRING_NARGS); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1191 | |
| 1192 | /* Show fields */ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1193 | for (i = 0; i < tp->nr_args; i++) |
| 1194 | SHOW_FIELD(unsigned long, args[i], tp->args[i].name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1195 | trace_seq_puts(s, "\n"); |
| 1196 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1197 | return __probe_event_show_format(s, tp, "(%lx)", |
| 1198 | "REC->" FIELD_STRING_IP); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1199 | } |
| 1200 | |
| 1201 | static int kretprobe_event_show_format(struct ftrace_event_call *call, |
| 1202 | struct trace_seq *s) |
| 1203 | { |
| 1204 | struct kretprobe_trace_entry field __attribute__((unused)); |
| 1205 | int ret, i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1206 | struct trace_probe *tp = (struct trace_probe *)call->data; |
| 1207 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1208 | SHOW_FIELD(unsigned long, func, FIELD_STRING_FUNC); |
| 1209 | SHOW_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP); |
| 1210 | SHOW_FIELD(int, nargs, FIELD_STRING_NARGS); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1211 | |
| 1212 | /* Show fields */ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1213 | for (i = 0; i < tp->nr_args; i++) |
| 1214 | SHOW_FIELD(unsigned long, args[i], tp->args[i].name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1215 | trace_seq_puts(s, "\n"); |
| 1216 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1217 | return __probe_event_show_format(s, tp, "(%lx <- %lx)", |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1218 | "REC->" FIELD_STRING_FUNC |
| 1219 | ", REC->" FIELD_STRING_RETIP); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1220 | } |
| 1221 | |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1222 | #ifdef CONFIG_EVENT_PROFILE |
| 1223 | |
| 1224 | /* Kprobe profile handler */ |
| 1225 | static __kprobes int kprobe_profile_func(struct kprobe *kp, |
| 1226 | struct pt_regs *regs) |
| 1227 | { |
| 1228 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
| 1229 | struct ftrace_event_call *call = &tp->call; |
| 1230 | struct kprobe_trace_entry *entry; |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1231 | struct trace_entry *ent; |
| 1232 | int size, __size, i, pc, __cpu; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1233 | unsigned long irq_flags; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1234 | char *trace_buf; |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1235 | char *raw_data; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1236 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1237 | |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1238 | pc = preempt_count(); |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1239 | __size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args); |
| 1240 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1241 | size -= sizeof(u32); |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1242 | if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE, |
| 1243 | "profile buffer not large enough")) |
| 1244 | return 0; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1245 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1246 | /* |
| 1247 | * Protect the non nmi buffer |
| 1248 | * This also protects the rcu read side |
| 1249 | */ |
| 1250 | local_irq_save(irq_flags); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1251 | |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1252 | rctx = perf_swevent_get_recursion_context(); |
| 1253 | if (rctx < 0) |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1254 | goto end_recursion; |
| 1255 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1256 | __cpu = smp_processor_id(); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1257 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1258 | if (in_nmi()) |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1259 | trace_buf = rcu_dereference(perf_trace_buf_nmi); |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1260 | else |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1261 | trace_buf = rcu_dereference(perf_trace_buf); |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1262 | |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1263 | if (!trace_buf) |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1264 | goto end; |
| 1265 | |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1266 | raw_data = per_cpu_ptr(trace_buf, __cpu); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1267 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1268 | /* Zero dead bytes from alignment to avoid buffer leak to userspace */ |
| 1269 | *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; |
| 1270 | entry = (struct kprobe_trace_entry *)raw_data; |
| 1271 | ent = &entry->ent; |
| 1272 | |
| 1273 | tracing_generic_entry_update(ent, irq_flags, pc); |
| 1274 | ent->type = call->id; |
| 1275 | entry->nargs = tp->nr_args; |
| 1276 | entry->ip = (unsigned long)kp->addr; |
| 1277 | for (i = 0; i < tp->nr_args; i++) |
| 1278 | entry->args[i] = call_fetch(&tp->args[i].fetch, regs); |
| 1279 | perf_tp_event(call->id, entry->ip, 1, entry, size); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1280 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1281 | end: |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1282 | perf_swevent_put_recursion_context(rctx); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1283 | end_recursion: |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1284 | local_irq_restore(irq_flags); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1285 | |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1286 | return 0; |
| 1287 | } |
| 1288 | |
| 1289 | /* Kretprobe profile handler */ |
| 1290 | static __kprobes int kretprobe_profile_func(struct kretprobe_instance *ri, |
| 1291 | struct pt_regs *regs) |
| 1292 | { |
| 1293 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 1294 | struct ftrace_event_call *call = &tp->call; |
| 1295 | struct kretprobe_trace_entry *entry; |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1296 | struct trace_entry *ent; |
| 1297 | int size, __size, i, pc, __cpu; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1298 | unsigned long irq_flags; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1299 | char *trace_buf; |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1300 | char *raw_data; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1301 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1302 | |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1303 | pc = preempt_count(); |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1304 | __size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args); |
| 1305 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1306 | size -= sizeof(u32); |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1307 | if (WARN_ONCE(size > FTRACE_MAX_PROFILE_SIZE, |
| 1308 | "profile buffer not large enough")) |
| 1309 | return 0; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1310 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1311 | /* |
| 1312 | * Protect the non nmi buffer |
| 1313 | * This also protects the rcu read side |
| 1314 | */ |
| 1315 | local_irq_save(irq_flags); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1316 | |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1317 | rctx = perf_swevent_get_recursion_context(); |
| 1318 | if (rctx < 0) |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1319 | goto end_recursion; |
| 1320 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1321 | __cpu = smp_processor_id(); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1322 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1323 | if (in_nmi()) |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1324 | trace_buf = rcu_dereference(perf_trace_buf_nmi); |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1325 | else |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1326 | trace_buf = rcu_dereference(perf_trace_buf); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1327 | |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1328 | if (!trace_buf) |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1329 | goto end; |
| 1330 | |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1331 | raw_data = per_cpu_ptr(trace_buf, __cpu); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1332 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1333 | /* Zero dead bytes from alignment to avoid buffer leak to userspace */ |
| 1334 | *(u64 *)(&raw_data[size - sizeof(u64)]) = 0ULL; |
| 1335 | entry = (struct kretprobe_trace_entry *)raw_data; |
| 1336 | ent = &entry->ent; |
| 1337 | |
| 1338 | tracing_generic_entry_update(ent, irq_flags, pc); |
| 1339 | ent->type = call->id; |
| 1340 | entry->nargs = tp->nr_args; |
| 1341 | entry->func = (unsigned long)tp->rp.kp.addr; |
| 1342 | entry->ret_ip = (unsigned long)ri->ret_addr; |
| 1343 | for (i = 0; i < tp->nr_args; i++) |
| 1344 | entry->args[i] = call_fetch(&tp->args[i].fetch, regs); |
| 1345 | perf_tp_event(call->id, entry->ret_ip, 1, entry, size); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1346 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1347 | end: |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1348 | perf_swevent_put_recursion_context(rctx); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1349 | end_recursion: |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1350 | local_irq_restore(irq_flags); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1351 | |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1352 | return 0; |
| 1353 | } |
| 1354 | |
| 1355 | static int probe_profile_enable(struct ftrace_event_call *call) |
| 1356 | { |
| 1357 | struct trace_probe *tp = (struct trace_probe *)call->data; |
| 1358 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1359 | tp->flags |= TP_FLAG_PROFILE; |
Frederic Weisbecker | d7a4b41 | 2009-09-23 23:08:43 +0200 | [diff] [blame] | 1360 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1361 | if (probe_is_return(tp)) |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1362 | return enable_kretprobe(&tp->rp); |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1363 | else |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1364 | return enable_kprobe(&tp->rp.kp); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1365 | } |
| 1366 | |
| 1367 | static void probe_profile_disable(struct ftrace_event_call *call) |
| 1368 | { |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1369 | struct trace_probe *tp = (struct trace_probe *)call->data; |
| 1370 | |
Frederic Weisbecker | d7a4b41 | 2009-09-23 23:08:43 +0200 | [diff] [blame] | 1371 | tp->flags &= ~TP_FLAG_PROFILE; |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1372 | |
Frederic Weisbecker | d7a4b41 | 2009-09-23 23:08:43 +0200 | [diff] [blame] | 1373 | if (!(tp->flags & TP_FLAG_TRACE)) { |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1374 | if (probe_is_return(tp)) |
| 1375 | disable_kretprobe(&tp->rp); |
| 1376 | else |
| 1377 | disable_kprobe(&tp->rp.kp); |
| 1378 | } |
| 1379 | } |
| 1380 | #endif /* CONFIG_EVENT_PROFILE */ |
| 1381 | |
| 1382 | |
| 1383 | static __kprobes |
| 1384 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
| 1385 | { |
| 1386 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
| 1387 | |
| 1388 | if (tp->flags & TP_FLAG_TRACE) |
| 1389 | kprobe_trace_func(kp, regs); |
| 1390 | #ifdef CONFIG_EVENT_PROFILE |
| 1391 | if (tp->flags & TP_FLAG_PROFILE) |
| 1392 | kprobe_profile_func(kp, regs); |
| 1393 | #endif /* CONFIG_EVENT_PROFILE */ |
| 1394 | return 0; /* We don't tweek kernel, so just return 0 */ |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1395 | } |
| 1396 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1397 | static __kprobes |
| 1398 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) |
| 1399 | { |
| 1400 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 1401 | |
| 1402 | if (tp->flags & TP_FLAG_TRACE) |
| 1403 | kretprobe_trace_func(ri, regs); |
| 1404 | #ifdef CONFIG_EVENT_PROFILE |
| 1405 | if (tp->flags & TP_FLAG_PROFILE) |
| 1406 | kretprobe_profile_func(ri, regs); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1407 | #endif /* CONFIG_EVENT_PROFILE */ |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1408 | return 0; /* We don't tweek kernel, so just return 0 */ |
| 1409 | } |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1410 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1411 | static int register_probe_event(struct trace_probe *tp) |
| 1412 | { |
| 1413 | struct ftrace_event_call *call = &tp->call; |
| 1414 | int ret; |
| 1415 | |
| 1416 | /* Initialize ftrace_event_call */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1417 | if (probe_is_return(tp)) { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1418 | tp->event.trace = print_kretprobe_event; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1419 | call->raw_init = probe_event_raw_init; |
| 1420 | call->show_format = kretprobe_event_show_format; |
| 1421 | call->define_fields = kretprobe_event_define_fields; |
| 1422 | } else { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1423 | tp->event.trace = print_kprobe_event; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1424 | call->raw_init = probe_event_raw_init; |
| 1425 | call->show_format = kprobe_event_show_format; |
| 1426 | call->define_fields = kprobe_event_define_fields; |
| 1427 | } |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1428 | call->event = &tp->event; |
| 1429 | call->id = register_ftrace_event(&tp->event); |
| 1430 | if (!call->id) |
| 1431 | return -ENODEV; |
Masami Hiramatsu | 5a0d905 | 2009-09-14 16:49:37 -0400 | [diff] [blame] | 1432 | call->enabled = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1433 | call->regfunc = probe_event_enable; |
| 1434 | call->unregfunc = probe_event_disable; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1435 | |
| 1436 | #ifdef CONFIG_EVENT_PROFILE |
| 1437 | atomic_set(&call->profile_count, -1); |
| 1438 | call->profile_enable = probe_profile_enable; |
| 1439 | call->profile_disable = probe_profile_disable; |
| 1440 | #endif |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1441 | call->data = tp; |
| 1442 | ret = trace_add_event_call(call); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1443 | if (ret) { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1444 | pr_info("Failed to register kprobe event: %s\n", call->name); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1445 | unregister_ftrace_event(&tp->event); |
| 1446 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1447 | return ret; |
| 1448 | } |
| 1449 | |
| 1450 | static void unregister_probe_event(struct trace_probe *tp) |
| 1451 | { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1452 | /* tp->event is unregistered in trace_remove_event_call() */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1453 | trace_remove_event_call(&tp->call); |
| 1454 | } |
| 1455 | |
| 1456 | /* Make a debugfs interface for controling probe points */ |
| 1457 | static __init int init_kprobe_trace(void) |
| 1458 | { |
| 1459 | struct dentry *d_tracer; |
| 1460 | struct dentry *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1461 | |
| 1462 | d_tracer = tracing_init_dentry(); |
| 1463 | if (!d_tracer) |
| 1464 | return 0; |
| 1465 | |
| 1466 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, |
| 1467 | NULL, &kprobe_events_ops); |
| 1468 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1469 | /* Event list interface */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1470 | if (!entry) |
| 1471 | pr_warning("Could not create debugfs " |
| 1472 | "'kprobe_events' entry\n"); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1473 | |
| 1474 | /* Profile interface */ |
| 1475 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, |
| 1476 | NULL, &kprobe_profile_ops); |
| 1477 | |
| 1478 | if (!entry) |
| 1479 | pr_warning("Could not create debugfs " |
| 1480 | "'kprobe_profile' entry\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1481 | return 0; |
| 1482 | } |
| 1483 | fs_initcall(init_kprobe_trace); |
| 1484 | |
| 1485 | |
| 1486 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 1487 | |
| 1488 | static int kprobe_trace_selftest_target(int a1, int a2, int a3, |
| 1489 | int a4, int a5, int a6) |
| 1490 | { |
| 1491 | return a1 + a2 + a3 + a4 + a5 + a6; |
| 1492 | } |
| 1493 | |
| 1494 | static __init int kprobe_trace_self_tests_init(void) |
| 1495 | { |
| 1496 | int ret; |
| 1497 | int (*target)(int, int, int, int, int, int); |
| 1498 | |
| 1499 | target = kprobe_trace_selftest_target; |
| 1500 | |
| 1501 | pr_info("Testing kprobe tracing: "); |
| 1502 | |
| 1503 | ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target " |
Masami Hiramatsu | f397af0 | 2009-10-16 20:07:20 -0400 | [diff] [blame] | 1504 | "$arg1 $arg2 $arg3 $arg4 $stack $stack0"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1505 | if (WARN_ON_ONCE(ret)) |
| 1506 | pr_warning("error enabling function entry\n"); |
| 1507 | |
| 1508 | ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target " |
Masami Hiramatsu | f397af0 | 2009-10-16 20:07:20 -0400 | [diff] [blame] | 1509 | "$retval"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1510 | if (WARN_ON_ONCE(ret)) |
| 1511 | pr_warning("error enabling function return\n"); |
| 1512 | |
| 1513 | ret = target(1, 2, 3, 4, 5, 6); |
| 1514 | |
| 1515 | cleanup_all_probes(); |
| 1516 | |
| 1517 | pr_cont("OK\n"); |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
| 1521 | late_initcall(kprobe_trace_self_tests_init); |
| 1522 | |
| 1523 | #endif |