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> |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 22 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 23 | #include "trace_probe.h" |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 24 | |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 25 | #define KPROBE_EVENT_SYSTEM "kprobes" |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 26 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 27 | /** |
Masami Hiramatsu | 77b44d1 | 2009-11-03 19:12:47 -0500 | [diff] [blame] | 28 | * Kprobe event core functions |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 29 | */ |
| 30 | |
| 31 | struct trace_probe { |
| 32 | struct list_head list; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 33 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 34 | unsigned long nhit; |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 35 | unsigned int flags; /* For TP_FLAG_* */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 36 | const char *symbol; /* symbol name */ |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 37 | struct ftrace_event_class class; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 38 | struct ftrace_event_call call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 39 | ssize_t size; /* trace entry size */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 40 | unsigned int nr_args; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 41 | struct probe_arg args[]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 42 | }; |
| 43 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 44 | #define SIZEOF_TRACE_PROBE(n) \ |
| 45 | (offsetof(struct trace_probe, args) + \ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 46 | (sizeof(struct probe_arg) * (n))) |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 47 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 48 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 49 | static __kprobes int trace_probe_is_return(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 50 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 51 | return tp->rp.handler != NULL; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 52 | } |
| 53 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 54 | static __kprobes const char *trace_probe_symbol(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 55 | { |
| 56 | return tp->symbol ? tp->symbol : "unknown"; |
| 57 | } |
| 58 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 59 | static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp) |
| 60 | { |
| 61 | return tp->rp.kp.offset; |
| 62 | } |
| 63 | |
| 64 | static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp) |
| 65 | { |
| 66 | return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE)); |
| 67 | } |
| 68 | |
| 69 | static __kprobes bool trace_probe_is_registered(struct trace_probe *tp) |
| 70 | { |
| 71 | return !!(tp->flags & TP_FLAG_REGISTERED); |
| 72 | } |
| 73 | |
| 74 | static __kprobes bool trace_probe_has_gone(struct trace_probe *tp) |
| 75 | { |
| 76 | return !!(kprobe_gone(&tp->rp.kp)); |
| 77 | } |
| 78 | |
| 79 | static __kprobes bool trace_probe_within_module(struct trace_probe *tp, |
| 80 | struct module *mod) |
| 81 | { |
| 82 | int len = strlen(mod->name); |
| 83 | const char *name = trace_probe_symbol(tp); |
| 84 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
| 85 | } |
| 86 | |
| 87 | static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp) |
| 88 | { |
| 89 | return !!strchr(trace_probe_symbol(tp), ':'); |
| 90 | } |
| 91 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 92 | static int register_probe_event(struct trace_probe *tp); |
| 93 | static void unregister_probe_event(struct trace_probe *tp); |
| 94 | |
| 95 | static DEFINE_MUTEX(probe_lock); |
| 96 | static LIST_HEAD(probe_list); |
| 97 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 98 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
| 99 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, |
| 100 | struct pt_regs *regs); |
| 101 | |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 102 | /* |
| 103 | * Allocate new trace_probe and initialize it (including kprobes). |
| 104 | */ |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 105 | static struct trace_probe *alloc_trace_probe(const char *group, |
| 106 | const char *event, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 107 | void *addr, |
| 108 | const char *symbol, |
| 109 | unsigned long offs, |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 110 | int nargs, bool is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 111 | { |
| 112 | struct trace_probe *tp; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 113 | int ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 114 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 115 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 116 | if (!tp) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 117 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 118 | |
| 119 | if (symbol) { |
| 120 | tp->symbol = kstrdup(symbol, GFP_KERNEL); |
| 121 | if (!tp->symbol) |
| 122 | goto error; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 123 | tp->rp.kp.symbol_name = tp->symbol; |
| 124 | tp->rp.kp.offset = offs; |
| 125 | } else |
| 126 | tp->rp.kp.addr = addr; |
| 127 | |
| 128 | if (is_return) |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 129 | tp->rp.handler = kretprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 130 | else |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 131 | tp->rp.kp.pre_handler = kprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 132 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 133 | if (!event || !is_good_name(event)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 134 | ret = -EINVAL; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 135 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 136 | } |
| 137 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 138 | tp->call.class = &tp->class; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 139 | tp->call.name = kstrdup(event, GFP_KERNEL); |
| 140 | if (!tp->call.name) |
| 141 | goto error; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 142 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 143 | if (!group || !is_good_name(group)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 144 | ret = -EINVAL; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 145 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 146 | } |
| 147 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 148 | tp->class.system = kstrdup(group, GFP_KERNEL); |
| 149 | if (!tp->class.system) |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 150 | goto error; |
| 151 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 152 | INIT_LIST_HEAD(&tp->list); |
| 153 | return tp; |
| 154 | error: |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 155 | kfree(tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 156 | kfree(tp->symbol); |
| 157 | kfree(tp); |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 158 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static void free_trace_probe(struct trace_probe *tp) |
| 162 | { |
| 163 | int i; |
| 164 | |
| 165 | for (i = 0; i < tp->nr_args; i++) |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 166 | traceprobe_free_probe_arg(&tp->args[i]); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 167 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 168 | kfree(tp->call.class->system); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 169 | kfree(tp->call.name); |
| 170 | kfree(tp->symbol); |
| 171 | kfree(tp); |
| 172 | } |
| 173 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 174 | static struct trace_probe *find_trace_probe(const char *event, |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 175 | const char *group) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 176 | { |
| 177 | struct trace_probe *tp; |
| 178 | |
| 179 | list_for_each_entry(tp, &probe_list, list) |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 180 | if (strcmp(tp->call.name, event) == 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 181 | strcmp(tp->call.class->system, group) == 0) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 182 | return tp; |
| 183 | return NULL; |
| 184 | } |
| 185 | |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 186 | /* Enable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */ |
| 187 | static int enable_trace_probe(struct trace_probe *tp, int flag) |
| 188 | { |
| 189 | int ret = 0; |
| 190 | |
| 191 | tp->flags |= flag; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 192 | if (trace_probe_is_enabled(tp) && trace_probe_is_registered(tp) && |
| 193 | !trace_probe_has_gone(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 194 | if (trace_probe_is_return(tp)) |
| 195 | ret = enable_kretprobe(&tp->rp); |
| 196 | else |
| 197 | ret = enable_kprobe(&tp->rp.kp); |
| 198 | } |
| 199 | |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | /* Disable trace_probe - @flag must be TP_FLAG_TRACE or TP_FLAG_PROFILE */ |
| 204 | static void disable_trace_probe(struct trace_probe *tp, int flag) |
| 205 | { |
| 206 | tp->flags &= ~flag; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 207 | if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 208 | if (trace_probe_is_return(tp)) |
| 209 | disable_kretprobe(&tp->rp); |
| 210 | else |
| 211 | disable_kprobe(&tp->rp.kp); |
| 212 | } |
| 213 | } |
| 214 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 215 | /* Internal register function - just handle k*probes and flags */ |
| 216 | static int __register_trace_probe(struct trace_probe *tp) |
| 217 | { |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 218 | int i, ret; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 219 | |
| 220 | if (trace_probe_is_registered(tp)) |
| 221 | return -EINVAL; |
| 222 | |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 223 | for (i = 0; i < tp->nr_args; i++) |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 224 | traceprobe_update_arg(&tp->args[i]); |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 225 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 226 | /* Set/clear disabled flag according to tp->flag */ |
| 227 | if (trace_probe_is_enabled(tp)) |
| 228 | tp->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; |
| 229 | else |
| 230 | tp->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
| 231 | |
| 232 | if (trace_probe_is_return(tp)) |
| 233 | ret = register_kretprobe(&tp->rp); |
| 234 | else |
| 235 | ret = register_kprobe(&tp->rp.kp); |
| 236 | |
| 237 | if (ret == 0) |
| 238 | tp->flags |= TP_FLAG_REGISTERED; |
| 239 | else { |
| 240 | pr_warning("Could not insert probe at %s+%lu: %d\n", |
| 241 | trace_probe_symbol(tp), trace_probe_offset(tp), ret); |
| 242 | if (ret == -ENOENT && trace_probe_is_on_module(tp)) { |
| 243 | pr_warning("This probe might be able to register after" |
| 244 | "target module is loaded. Continue.\n"); |
| 245 | ret = 0; |
| 246 | } else if (ret == -EILSEQ) { |
| 247 | pr_warning("Probing address(0x%p) is not an " |
| 248 | "instruction boundary.\n", |
| 249 | tp->rp.kp.addr); |
| 250 | ret = -EINVAL; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | /* Internal unregister function - just handle k*probes and flags */ |
| 258 | static void __unregister_trace_probe(struct trace_probe *tp) |
| 259 | { |
| 260 | if (trace_probe_is_registered(tp)) { |
| 261 | if (trace_probe_is_return(tp)) |
| 262 | unregister_kretprobe(&tp->rp); |
| 263 | else |
| 264 | unregister_kprobe(&tp->rp.kp); |
| 265 | tp->flags &= ~TP_FLAG_REGISTERED; |
| 266 | /* Cleanup kprobe for reuse */ |
| 267 | if (tp->rp.kp.symbol_name) |
| 268 | tp->rp.kp.addr = NULL; |
| 269 | } |
| 270 | } |
| 271 | |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 272 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 273 | static int unregister_trace_probe(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 274 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 275 | /* Enabled event can not be unregistered */ |
| 276 | if (trace_probe_is_enabled(tp)) |
| 277 | return -EBUSY; |
| 278 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 279 | __unregister_trace_probe(tp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 280 | list_del(&tp->list); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 281 | unregister_probe_event(tp); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 282 | |
| 283 | return 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | /* Register a trace_probe and probe_event */ |
| 287 | static int register_trace_probe(struct trace_probe *tp) |
| 288 | { |
| 289 | struct trace_probe *old_tp; |
| 290 | int ret; |
| 291 | |
| 292 | mutex_lock(&probe_lock); |
| 293 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 294 | /* Delete old (same name) event if exist */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 295 | old_tp = find_trace_probe(tp->call.name, tp->call.class->system); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 296 | if (old_tp) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 297 | ret = unregister_trace_probe(old_tp); |
| 298 | if (ret < 0) |
| 299 | goto end; |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 300 | free_trace_probe(old_tp); |
| 301 | } |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 302 | |
| 303 | /* Register new event */ |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 304 | ret = register_probe_event(tp); |
| 305 | if (ret) { |
Paul Bolle | 426d310 | 2010-08-07 12:30:03 +0200 | [diff] [blame] | 306 | pr_warning("Failed to register probe event(%d)\n", ret); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 307 | goto end; |
| 308 | } |
| 309 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 310 | /* Register k*probe */ |
| 311 | ret = __register_trace_probe(tp); |
| 312 | if (ret < 0) |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 313 | unregister_probe_event(tp); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 314 | else |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 315 | list_add_tail(&tp->list, &probe_list); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 316 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 317 | end: |
| 318 | mutex_unlock(&probe_lock); |
| 319 | return ret; |
| 320 | } |
| 321 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 322 | /* Module notifier call back, checking event on the module */ |
| 323 | static int trace_probe_module_callback(struct notifier_block *nb, |
| 324 | unsigned long val, void *data) |
| 325 | { |
| 326 | struct module *mod = data; |
| 327 | struct trace_probe *tp; |
| 328 | int ret; |
| 329 | |
| 330 | if (val != MODULE_STATE_COMING) |
| 331 | return NOTIFY_DONE; |
| 332 | |
| 333 | /* Update probes on coming module */ |
| 334 | mutex_lock(&probe_lock); |
| 335 | list_for_each_entry(tp, &probe_list, list) { |
| 336 | if (trace_probe_within_module(tp, mod)) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 337 | /* Don't need to check busy - this should have gone. */ |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 338 | __unregister_trace_probe(tp); |
| 339 | ret = __register_trace_probe(tp); |
| 340 | if (ret) |
| 341 | pr_warning("Failed to re-register probe %s on" |
| 342 | "%s: %d\n", |
| 343 | tp->call.name, mod->name, ret); |
| 344 | } |
| 345 | } |
| 346 | mutex_unlock(&probe_lock); |
| 347 | |
| 348 | return NOTIFY_DONE; |
| 349 | } |
| 350 | |
| 351 | static struct notifier_block trace_probe_module_nb = { |
| 352 | .notifier_call = trace_probe_module_callback, |
| 353 | .priority = 1 /* Invoked after kprobe module callback */ |
| 354 | }; |
| 355 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 356 | static int create_trace_probe(int argc, char **argv) |
| 357 | { |
| 358 | /* |
| 359 | * Argument syntax: |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 360 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
| 361 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 362 | * Fetch args: |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 363 | * $retval : fetch return value |
| 364 | * $stack : fetch stack address |
| 365 | * $stackN : fetch Nth of stack (N:0-) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 366 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
| 367 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) |
| 368 | * %REG : fetch register REG |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 369 | * Dereferencing memory fetch: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 370 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 371 | * Alias name of args: |
| 372 | * NAME=FETCHARG : set NAME as alias of FETCHARG. |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 373 | * Type of args: |
| 374 | * FETCHARG:TYPE : use TYPE instead of unsigned long. |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 375 | */ |
| 376 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 377 | int i, ret = 0; |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 378 | bool is_return = false, is_delete = false; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 379 | char *symbol = NULL, *event = NULL, *group = NULL; |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 380 | char *arg; |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 381 | unsigned long offset = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 382 | void *addr = NULL; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 383 | char buf[MAX_EVENT_NAME_LEN]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 384 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 385 | /* argc must be >= 1 */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 386 | if (argv[0][0] == 'p') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 387 | is_return = false; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 388 | else if (argv[0][0] == 'r') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 389 | is_return = true; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 390 | else if (argv[0][0] == '-') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 391 | is_delete = true; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 392 | else { |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 393 | pr_info("Probe definition must be started with 'p', 'r' or" |
| 394 | " '-'.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 395 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 396 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 397 | |
| 398 | if (argv[0][1] == ':') { |
| 399 | event = &argv[0][2]; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 400 | if (strchr(event, '/')) { |
| 401 | group = event; |
| 402 | event = strchr(group, '/') + 1; |
| 403 | event[-1] = '\0'; |
| 404 | if (strlen(group) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 405 | pr_info("Group name is not specified\n"); |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 406 | return -EINVAL; |
| 407 | } |
| 408 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 409 | if (strlen(event) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 410 | pr_info("Event name is not specified\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 411 | return -EINVAL; |
| 412 | } |
| 413 | } |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 414 | if (!group) |
| 415 | group = KPROBE_EVENT_SYSTEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 416 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 417 | if (is_delete) { |
| 418 | if (!event) { |
| 419 | pr_info("Delete command needs an event name.\n"); |
| 420 | return -EINVAL; |
| 421 | } |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 422 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 423 | tp = find_trace_probe(event, group); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 424 | if (!tp) { |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 425 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 426 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
| 427 | return -ENOENT; |
| 428 | } |
| 429 | /* delete an event */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 430 | ret = unregister_trace_probe(tp); |
| 431 | if (ret == 0) |
| 432 | free_trace_probe(tp); |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 433 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 434 | return ret; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | if (argc < 2) { |
| 438 | pr_info("Probe point is not specified.\n"); |
| 439 | return -EINVAL; |
| 440 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 441 | if (isdigit(argv[1][0])) { |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 442 | if (is_return) { |
| 443 | pr_info("Return probe point must be a symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 444 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 445 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 446 | /* an address specified */ |
Heiko Carstens | a9bb18f | 2010-02-10 17:23:47 +0100 | [diff] [blame] | 447 | ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 448 | if (ret) { |
| 449 | pr_info("Failed to parse address.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 450 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 451 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 452 | } else { |
| 453 | /* a symbol specified */ |
| 454 | symbol = argv[1]; |
| 455 | /* TODO: support .init module functions */ |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 456 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 457 | if (ret) { |
| 458 | pr_info("Failed to parse symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 459 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 460 | } |
| 461 | if (offset && is_return) { |
| 462 | pr_info("Return probe must be used without offset.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 463 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 464 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 465 | } |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 466 | argc -= 2; argv += 2; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 467 | |
| 468 | /* setup a probe */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 469 | if (!event) { |
| 470 | /* Make a new event name */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 471 | if (symbol) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 472 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 473 | is_return ? 'r' : 'p', symbol, offset); |
| 474 | else |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 475 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 476 | is_return ? 'r' : 'p', addr); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 477 | event = buf; |
| 478 | } |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 479 | tp = alloc_trace_probe(group, event, addr, symbol, offset, argc, |
| 480 | is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 481 | if (IS_ERR(tp)) { |
| 482 | pr_info("Failed to allocate trace_probe.(%d)\n", |
| 483 | (int)PTR_ERR(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 484 | return PTR_ERR(tp); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 485 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 486 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 487 | /* parse arguments */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 488 | ret = 0; |
| 489 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
Masami Hiramatsu | 61a5273 | 2010-08-27 20:38:46 +0900 | [diff] [blame] | 490 | /* Increment count for freeing args in error case */ |
| 491 | tp->nr_args++; |
| 492 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 493 | /* Parse argument name */ |
| 494 | arg = strchr(argv[i], '='); |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 495 | if (arg) { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 496 | *arg++ = '\0'; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 497 | tp->args[i].name = kstrdup(argv[i], GFP_KERNEL); |
| 498 | } else { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 499 | arg = argv[i]; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 500 | /* If argument name is omitted, set "argN" */ |
| 501 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); |
| 502 | tp->args[i].name = kstrdup(buf, GFP_KERNEL); |
| 503 | } |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 504 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 505 | if (!tp->args[i].name) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 506 | pr_info("Failed to allocate argument[%d] name.\n", i); |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 507 | ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 508 | goto error; |
| 509 | } |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 510 | |
| 511 | if (!is_good_name(tp->args[i].name)) { |
| 512 | pr_info("Invalid argument[%d] name: %s\n", |
| 513 | i, tp->args[i].name); |
| 514 | ret = -EINVAL; |
| 515 | goto error; |
| 516 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 517 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 518 | if (traceprobe_conflict_field_name(tp->args[i].name, |
| 519 | tp->args, i)) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 520 | pr_info("Argument[%d] name '%s' conflicts with " |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 521 | "another field.\n", i, argv[i]); |
| 522 | ret = -EINVAL; |
| 523 | goto error; |
| 524 | } |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 525 | |
| 526 | /* Parse fetch argument */ |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 527 | ret = traceprobe_parse_probe_arg(arg, &tp->size, &tp->args[i], |
Srikar Dronamraju | f3f096c | 2012-04-11 16:00:43 +0530 | [diff] [blame] | 528 | is_return, true); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 529 | if (ret) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 530 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 531 | goto error; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 532 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 533 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 534 | |
| 535 | ret = register_trace_probe(tp); |
| 536 | if (ret) |
| 537 | goto error; |
| 538 | return 0; |
| 539 | |
| 540 | error: |
| 541 | free_trace_probe(tp); |
| 542 | return ret; |
| 543 | } |
| 544 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 545 | static int release_all_trace_probes(void) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 546 | { |
| 547 | struct trace_probe *tp; |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 548 | int ret = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 549 | |
| 550 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 551 | /* Ensure no probe is in use. */ |
| 552 | list_for_each_entry(tp, &probe_list, list) |
| 553 | if (trace_probe_is_enabled(tp)) { |
| 554 | ret = -EBUSY; |
| 555 | goto end; |
| 556 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 557 | /* TODO: Use batch unregistration */ |
| 558 | while (!list_empty(&probe_list)) { |
| 559 | tp = list_entry(probe_list.next, struct trace_probe, list); |
| 560 | unregister_trace_probe(tp); |
| 561 | free_trace_probe(tp); |
| 562 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 563 | |
| 564 | end: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 565 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 566 | |
| 567 | return ret; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 568 | } |
| 569 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 570 | /* Probes listing interfaces */ |
| 571 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) |
| 572 | { |
| 573 | mutex_lock(&probe_lock); |
| 574 | return seq_list_start(&probe_list, *pos); |
| 575 | } |
| 576 | |
| 577 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 578 | { |
| 579 | return seq_list_next(v, &probe_list, pos); |
| 580 | } |
| 581 | |
| 582 | static void probes_seq_stop(struct seq_file *m, void *v) |
| 583 | { |
| 584 | mutex_unlock(&probe_lock); |
| 585 | } |
| 586 | |
| 587 | static int probes_seq_show(struct seq_file *m, void *v) |
| 588 | { |
| 589 | struct trace_probe *tp = v; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 590 | int i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 591 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 592 | seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p'); |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 593 | seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 594 | |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 595 | if (!tp->symbol) |
| 596 | seq_printf(m, " 0x%p", tp->rp.kp.addr); |
| 597 | else if (tp->rp.kp.offset) |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 598 | seq_printf(m, " %s+%u", trace_probe_symbol(tp), |
| 599 | tp->rp.kp.offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 600 | else |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 601 | seq_printf(m, " %s", trace_probe_symbol(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 602 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 603 | for (i = 0; i < tp->nr_args; i++) |
| 604 | 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] | 605 | seq_printf(m, "\n"); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 606 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | static const struct seq_operations probes_seq_op = { |
| 611 | .start = probes_seq_start, |
| 612 | .next = probes_seq_next, |
| 613 | .stop = probes_seq_stop, |
| 614 | .show = probes_seq_show |
| 615 | }; |
| 616 | |
| 617 | static int probes_open(struct inode *inode, struct file *file) |
| 618 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 619 | int ret; |
| 620 | |
| 621 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
| 622 | ret = release_all_trace_probes(); |
| 623 | if (ret < 0) |
| 624 | return ret; |
| 625 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 626 | |
| 627 | return seq_open(file, &probes_seq_op); |
| 628 | } |
| 629 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 630 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
| 631 | size_t count, loff_t *ppos) |
| 632 | { |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 633 | return traceprobe_probes_write(file, buffer, count, ppos, |
| 634 | create_trace_probe); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | static const struct file_operations kprobe_events_ops = { |
| 638 | .owner = THIS_MODULE, |
| 639 | .open = probes_open, |
| 640 | .read = seq_read, |
| 641 | .llseek = seq_lseek, |
| 642 | .release = seq_release, |
| 643 | .write = probes_write, |
| 644 | }; |
| 645 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 646 | /* Probes profiling interfaces */ |
| 647 | static int probes_profile_seq_show(struct seq_file *m, void *v) |
| 648 | { |
| 649 | struct trace_probe *tp = v; |
| 650 | |
| 651 | seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 652 | tp->rp.kp.nmissed); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 653 | |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | static const struct seq_operations profile_seq_op = { |
| 658 | .start = probes_seq_start, |
| 659 | .next = probes_seq_next, |
| 660 | .stop = probes_seq_stop, |
| 661 | .show = probes_profile_seq_show |
| 662 | }; |
| 663 | |
| 664 | static int profile_open(struct inode *inode, struct file *file) |
| 665 | { |
| 666 | return seq_open(file, &profile_seq_op); |
| 667 | } |
| 668 | |
| 669 | static const struct file_operations kprobe_profile_ops = { |
| 670 | .owner = THIS_MODULE, |
| 671 | .open = profile_open, |
| 672 | .read = seq_read, |
| 673 | .llseek = seq_lseek, |
| 674 | .release = seq_release, |
| 675 | }; |
| 676 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 677 | /* Sum up total data length for dynamic arraies (strings) */ |
| 678 | static __kprobes int __get_data_size(struct trace_probe *tp, |
| 679 | struct pt_regs *regs) |
| 680 | { |
| 681 | int i, ret = 0; |
| 682 | u32 len; |
| 683 | |
| 684 | for (i = 0; i < tp->nr_args; i++) |
| 685 | if (unlikely(tp->args[i].fetch_size.fn)) { |
| 686 | call_fetch(&tp->args[i].fetch_size, regs, &len); |
| 687 | ret += len; |
| 688 | } |
| 689 | |
| 690 | return ret; |
| 691 | } |
| 692 | |
| 693 | /* Store the value of each argument */ |
| 694 | static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp, |
| 695 | struct pt_regs *regs, |
| 696 | u8 *data, int maxlen) |
| 697 | { |
| 698 | int i; |
| 699 | u32 end = tp->size; |
| 700 | u32 *dl; /* Data (relative) location */ |
| 701 | |
| 702 | for (i = 0; i < tp->nr_args; i++) { |
| 703 | if (unlikely(tp->args[i].fetch_size.fn)) { |
| 704 | /* |
| 705 | * First, we set the relative location and |
| 706 | * maximum data length to *dl |
| 707 | */ |
| 708 | dl = (u32 *)(data + tp->args[i].offset); |
| 709 | *dl = make_data_rloc(maxlen, end - tp->args[i].offset); |
| 710 | /* Then try to fetch string or dynamic array data */ |
| 711 | call_fetch(&tp->args[i].fetch, regs, dl); |
| 712 | /* Reduce maximum length */ |
| 713 | end += get_rloc_len(*dl); |
| 714 | maxlen -= get_rloc_len(*dl); |
| 715 | /* Trick here, convert data_rloc to data_loc */ |
| 716 | *dl = convert_rloc_to_loc(*dl, |
| 717 | ent_size + tp->args[i].offset); |
| 718 | } else |
| 719 | /* Just fetching data normally */ |
| 720 | call_fetch(&tp->args[i].fetch, regs, |
| 721 | data + tp->args[i].offset); |
| 722 | } |
| 723 | } |
| 724 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 725 | /* Kprobe handler */ |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 726 | 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] | 727 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 728 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 729 | struct kprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 730 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 731 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 732 | int size, dsize, pc; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 733 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 734 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 735 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 736 | tp->nhit++; |
| 737 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 738 | local_save_flags(irq_flags); |
| 739 | pc = preempt_count(); |
| 740 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 741 | dsize = __get_data_size(tp, regs); |
| 742 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 743 | |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 744 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
| 745 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 746 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 747 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 748 | |
| 749 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 750 | entry->ip = (unsigned long)kp->addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 751 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 752 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 753 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Masami Hiramatsu | 1fd8df2 | 2011-06-08 16:09:34 +0900 | [diff] [blame] | 754 | trace_nowake_buffer_unlock_commit_regs(buffer, event, |
| 755 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | /* Kretprobe handler */ |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 759 | static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri, |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 760 | struct pt_regs *regs) |
| 761 | { |
| 762 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 763 | struct kretprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 764 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 765 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 766 | int size, pc, dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 767 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 768 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 769 | |
| 770 | local_save_flags(irq_flags); |
| 771 | pc = preempt_count(); |
| 772 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 773 | dsize = __get_data_size(tp, regs); |
| 774 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 775 | |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 776 | event = trace_current_buffer_lock_reserve(&buffer, call->event.type, |
| 777 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 778 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 779 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 780 | |
| 781 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 782 | entry->func = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 783 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 784 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 785 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 786 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Masami Hiramatsu | 1fd8df2 | 2011-06-08 16:09:34 +0900 | [diff] [blame] | 787 | trace_nowake_buffer_unlock_commit_regs(buffer, event, |
| 788 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | /* Event entry printers */ |
| 792 | enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 793 | print_kprobe_event(struct trace_iterator *iter, int flags, |
| 794 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 795 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 796 | struct kprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 797 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 798 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 799 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 800 | int i; |
| 801 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 802 | field = (struct kprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 803 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 804 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 805 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 806 | goto partial; |
| 807 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 808 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 809 | goto partial; |
| 810 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 811 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 812 | goto partial; |
| 813 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 814 | data = (u8 *)&field[1]; |
| 815 | for (i = 0; i < tp->nr_args; i++) |
| 816 | if (!tp->args[i].type->print(s, tp->args[i].name, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 817 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 818 | goto partial; |
| 819 | |
| 820 | if (!trace_seq_puts(s, "\n")) |
| 821 | goto partial; |
| 822 | |
| 823 | return TRACE_TYPE_HANDLED; |
| 824 | partial: |
| 825 | return TRACE_TYPE_PARTIAL_LINE; |
| 826 | } |
| 827 | |
| 828 | enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 829 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
| 830 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 831 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 832 | struct kretprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 833 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 834 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 835 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 836 | int i; |
| 837 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 838 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 839 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 840 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 841 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 842 | goto partial; |
| 843 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 844 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 845 | goto partial; |
| 846 | |
| 847 | if (!trace_seq_puts(s, " <- ")) |
| 848 | goto partial; |
| 849 | |
| 850 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) |
| 851 | goto partial; |
| 852 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 853 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 854 | goto partial; |
| 855 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 856 | data = (u8 *)&field[1]; |
| 857 | for (i = 0; i < tp->nr_args; i++) |
| 858 | if (!tp->args[i].type->print(s, tp->args[i].name, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 859 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 860 | goto partial; |
| 861 | |
| 862 | if (!trace_seq_puts(s, "\n")) |
| 863 | goto partial; |
| 864 | |
| 865 | return TRACE_TYPE_HANDLED; |
| 866 | partial: |
| 867 | return TRACE_TYPE_PARTIAL_LINE; |
| 868 | } |
| 869 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 870 | |
| 871 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 872 | { |
| 873 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 874 | struct kprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 875 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 876 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 877 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 878 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 879 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 880 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 881 | tp->args[i].name, |
| 882 | sizeof(field) + tp->args[i].offset, |
| 883 | tp->args[i].type->size, |
| 884 | tp->args[i].type->is_signed, |
| 885 | FILTER_OTHER); |
| 886 | if (ret) |
| 887 | return ret; |
| 888 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 889 | return 0; |
| 890 | } |
| 891 | |
| 892 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 893 | { |
| 894 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 895 | struct kretprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 896 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 897 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 898 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
| 899 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 900 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 901 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 902 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 903 | tp->args[i].name, |
| 904 | sizeof(field) + tp->args[i].offset, |
| 905 | tp->args[i].type->size, |
| 906 | tp->args[i].type->is_signed, |
| 907 | FILTER_OTHER); |
| 908 | if (ret) |
| 909 | return ret; |
| 910 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 911 | return 0; |
| 912 | } |
| 913 | |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 914 | static int __set_print_fmt(struct trace_probe *tp, char *buf, int len) |
| 915 | { |
| 916 | int i; |
| 917 | int pos = 0; |
| 918 | |
| 919 | const char *fmt, *arg; |
| 920 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 921 | if (!trace_probe_is_return(tp)) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 922 | fmt = "(%lx)"; |
| 923 | arg = "REC->" FIELD_STRING_IP; |
| 924 | } else { |
| 925 | fmt = "(%lx <- %lx)"; |
| 926 | arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP; |
| 927 | } |
| 928 | |
| 929 | /* When len=0, we just calculate the needed length */ |
| 930 | #define LEN_OR_ZERO (len ? len - pos : 0) |
| 931 | |
| 932 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt); |
| 933 | |
| 934 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 935 | pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s", |
| 936 | tp->args[i].name, tp->args[i].type->fmt); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg); |
| 940 | |
| 941 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 942 | if (strcmp(tp->args[i].type->name, "string") == 0) |
| 943 | pos += snprintf(buf + pos, LEN_OR_ZERO, |
| 944 | ", __get_str(%s)", |
| 945 | tp->args[i].name); |
| 946 | else |
| 947 | pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s", |
| 948 | tp->args[i].name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | #undef LEN_OR_ZERO |
| 952 | |
| 953 | /* return the length of print_fmt */ |
| 954 | return pos; |
| 955 | } |
| 956 | |
| 957 | static int set_print_fmt(struct trace_probe *tp) |
| 958 | { |
| 959 | int len; |
| 960 | char *print_fmt; |
| 961 | |
| 962 | /* First: called with 0 length to calculate the needed length */ |
| 963 | len = __set_print_fmt(tp, NULL, 0); |
| 964 | print_fmt = kmalloc(len + 1, GFP_KERNEL); |
| 965 | if (!print_fmt) |
| 966 | return -ENOMEM; |
| 967 | |
| 968 | /* Second: actually write the @print_fmt */ |
| 969 | __set_print_fmt(tp, print_fmt, len + 1); |
| 970 | tp->call.print_fmt = print_fmt; |
| 971 | |
| 972 | return 0; |
| 973 | } |
| 974 | |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 975 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 976 | |
| 977 | /* Kprobe profile handler */ |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 978 | static __kprobes void kprobe_perf_func(struct kprobe *kp, |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 979 | struct pt_regs *regs) |
| 980 | { |
| 981 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
| 982 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 983 | struct kprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 984 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 985 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 986 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 987 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 988 | dsize = __get_data_size(tp, regs); |
| 989 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 990 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 991 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 992 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 993 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 994 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 995 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 996 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 997 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 998 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 999 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1000 | entry->ip = (unsigned long)kp->addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1001 | memset(&entry[1], 0, dsize); |
| 1002 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1003 | |
Peter Zijlstra | 3771f07 | 2010-05-21 12:31:09 +0200 | [diff] [blame] | 1004 | head = this_cpu_ptr(call->perf_events); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 1005 | perf_trace_buf_submit(entry, size, rctx, |
| 1006 | entry->ip, 1, regs, head, NULL); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1007 | } |
| 1008 | |
| 1009 | /* Kretprobe profile handler */ |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1010 | static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri, |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1011 | struct pt_regs *regs) |
| 1012 | { |
| 1013 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 1014 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1015 | struct kretprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1016 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1017 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1018 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1019 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1020 | dsize = __get_data_size(tp, regs); |
| 1021 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1022 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1023 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1024 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1025 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1026 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1027 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1028 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1029 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1030 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1031 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1032 | entry->func = (unsigned long)tp->rp.kp.addr; |
| 1033 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1034 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Frederic Weisbecker | 444a2a3 | 2009-11-06 04:13:05 +0100 | [diff] [blame] | 1035 | |
Peter Zijlstra | 3771f07 | 2010-05-21 12:31:09 +0200 | [diff] [blame] | 1036 | head = this_cpu_ptr(call->perf_events); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 1037 | perf_trace_buf_submit(entry, size, rctx, |
| 1038 | entry->ret_ip, 1, regs, head, NULL); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1039 | } |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1040 | #endif /* CONFIG_PERF_EVENTS */ |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1041 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1042 | static __kprobes |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1043 | int kprobe_register(struct ftrace_event_call *event, |
| 1044 | enum trace_reg type, void *data) |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1045 | { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1046 | struct trace_probe *tp = (struct trace_probe *)event->data; |
| 1047 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1048 | switch (type) { |
| 1049 | case TRACE_REG_REGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1050 | return enable_trace_probe(tp, TP_FLAG_TRACE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1051 | case TRACE_REG_UNREGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1052 | disable_trace_probe(tp, TP_FLAG_TRACE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1053 | return 0; |
| 1054 | |
| 1055 | #ifdef CONFIG_PERF_EVENTS |
| 1056 | case TRACE_REG_PERF_REGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1057 | return enable_trace_probe(tp, TP_FLAG_PROFILE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1058 | case TRACE_REG_PERF_UNREGISTER: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1059 | disable_trace_probe(tp, TP_FLAG_PROFILE); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1060 | return 0; |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1061 | case TRACE_REG_PERF_OPEN: |
| 1062 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 1063 | case TRACE_REG_PERF_ADD: |
| 1064 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1065 | return 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1066 | #endif |
| 1067 | } |
| 1068 | return 0; |
| 1069 | } |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1070 | |
| 1071 | static __kprobes |
| 1072 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
| 1073 | { |
| 1074 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
| 1075 | |
| 1076 | if (tp->flags & TP_FLAG_TRACE) |
| 1077 | kprobe_trace_func(kp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1078 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1079 | if (tp->flags & TP_FLAG_PROFILE) |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1080 | kprobe_perf_func(kp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1081 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1082 | return 0; /* We don't tweek kernel, so just return 0 */ |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1083 | } |
| 1084 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1085 | static __kprobes |
| 1086 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) |
| 1087 | { |
| 1088 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 1089 | |
| 1090 | if (tp->flags & TP_FLAG_TRACE) |
| 1091 | kretprobe_trace_func(ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1092 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1093 | if (tp->flags & TP_FLAG_PROFILE) |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1094 | kretprobe_perf_func(ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1095 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1096 | return 0; /* We don't tweek kernel, so just return 0 */ |
| 1097 | } |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1098 | |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1099 | static struct trace_event_functions kretprobe_funcs = { |
| 1100 | .trace = print_kretprobe_event |
| 1101 | }; |
| 1102 | |
| 1103 | static struct trace_event_functions kprobe_funcs = { |
| 1104 | .trace = print_kprobe_event |
| 1105 | }; |
| 1106 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1107 | static int register_probe_event(struct trace_probe *tp) |
| 1108 | { |
| 1109 | struct ftrace_event_call *call = &tp->call; |
| 1110 | int ret; |
| 1111 | |
| 1112 | /* Initialize ftrace_event_call */ |
Li Zefan | ffb9f99 | 2010-05-24 16:24:52 +0800 | [diff] [blame] | 1113 | INIT_LIST_HEAD(&call->class->fields); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1114 | if (trace_probe_is_return(tp)) { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1115 | call->event.funcs = &kretprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1116 | call->class->define_fields = kretprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1117 | } else { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1118 | call->event.funcs = &kprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1119 | call->class->define_fields = kprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1120 | } |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1121 | if (set_print_fmt(tp) < 0) |
| 1122 | return -ENOMEM; |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 1123 | ret = register_ftrace_event(&call->event); |
| 1124 | if (!ret) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1125 | kfree(call->print_fmt); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1126 | return -ENODEV; |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1127 | } |
Steven Rostedt | 553552c | 2010-04-23 11:12:36 -0400 | [diff] [blame] | 1128 | call->flags = 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1129 | call->class->reg = kprobe_register; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1130 | call->data = tp; |
| 1131 | ret = trace_add_event_call(call); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1132 | if (ret) { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1133 | pr_info("Failed to register kprobe event: %s\n", call->name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1134 | kfree(call->print_fmt); |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1135 | unregister_ftrace_event(&call->event); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1136 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1137 | return ret; |
| 1138 | } |
| 1139 | |
| 1140 | static void unregister_probe_event(struct trace_probe *tp) |
| 1141 | { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1142 | /* tp->event is unregistered in trace_remove_event_call() */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1143 | trace_remove_event_call(&tp->call); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1144 | kfree(tp->call.print_fmt); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1145 | } |
| 1146 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1147 | /* Make a debugfs interface for controlling probe points */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1148 | static __init int init_kprobe_trace(void) |
| 1149 | { |
| 1150 | struct dentry *d_tracer; |
| 1151 | struct dentry *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1152 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 1153 | if (register_module_notifier(&trace_probe_module_nb)) |
| 1154 | return -EINVAL; |
| 1155 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1156 | d_tracer = tracing_init_dentry(); |
| 1157 | if (!d_tracer) |
| 1158 | return 0; |
| 1159 | |
| 1160 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, |
| 1161 | NULL, &kprobe_events_ops); |
| 1162 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1163 | /* Event list interface */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1164 | if (!entry) |
| 1165 | pr_warning("Could not create debugfs " |
| 1166 | "'kprobe_events' entry\n"); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1167 | |
| 1168 | /* Profile interface */ |
| 1169 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, |
| 1170 | NULL, &kprobe_profile_ops); |
| 1171 | |
| 1172 | if (!entry) |
| 1173 | pr_warning("Could not create debugfs " |
| 1174 | "'kprobe_profile' entry\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1175 | return 0; |
| 1176 | } |
| 1177 | fs_initcall(init_kprobe_trace); |
| 1178 | |
| 1179 | |
| 1180 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 1181 | |
Steven Rostedt | 265a5b7 | 2011-06-06 22:35:13 -0400 | [diff] [blame] | 1182 | /* |
| 1183 | * The "__used" keeps gcc from removing the function symbol |
| 1184 | * from the kallsyms table. |
| 1185 | */ |
| 1186 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, |
| 1187 | int a4, int a5, int a6) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1188 | { |
| 1189 | return a1 + a2 + a3 + a4 + a5 + a6; |
| 1190 | } |
| 1191 | |
| 1192 | static __init int kprobe_trace_self_tests_init(void) |
| 1193 | { |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1194 | int ret, warn = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1195 | int (*target)(int, int, int, int, int, int); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1196 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1197 | |
| 1198 | target = kprobe_trace_selftest_target; |
| 1199 | |
| 1200 | pr_info("Testing kprobe tracing: "); |
| 1201 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1202 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
| 1203 | "$stack $stack0 +0($stack)", |
| 1204 | create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1205 | if (WARN_ON_ONCE(ret)) { |
| 1206 | pr_warning("error on probing function entry.\n"); |
| 1207 | warn++; |
| 1208 | } else { |
| 1209 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1210 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1211 | if (WARN_ON_ONCE(tp == NULL)) { |
| 1212 | pr_warning("error on getting new probe.\n"); |
| 1213 | warn++; |
| 1214 | } else |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1215 | enable_trace_probe(tp, TP_FLAG_TRACE); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1216 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1217 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1218 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
| 1219 | "$retval", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1220 | if (WARN_ON_ONCE(ret)) { |
| 1221 | pr_warning("error on probing function return.\n"); |
| 1222 | warn++; |
| 1223 | } else { |
| 1224 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1225 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1226 | if (WARN_ON_ONCE(tp == NULL)) { |
| 1227 | pr_warning("error on getting new probe.\n"); |
| 1228 | warn++; |
| 1229 | } else |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1230 | enable_trace_probe(tp, TP_FLAG_TRACE); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | if (warn) |
| 1234 | goto end; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1235 | |
| 1236 | ret = target(1, 2, 3, 4, 5, 6); |
| 1237 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1238 | /* Disable trace points before removing it */ |
| 1239 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
| 1240 | if (WARN_ON_ONCE(tp == NULL)) { |
| 1241 | pr_warning("error on getting test probe.\n"); |
| 1242 | warn++; |
| 1243 | } else |
| 1244 | disable_trace_probe(tp, TP_FLAG_TRACE); |
| 1245 | |
| 1246 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
| 1247 | if (WARN_ON_ONCE(tp == NULL)) { |
| 1248 | pr_warning("error on getting 2nd test probe.\n"); |
| 1249 | warn++; |
| 1250 | } else |
| 1251 | disable_trace_probe(tp, TP_FLAG_TRACE); |
| 1252 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1253 | ret = traceprobe_command("-:testprobe", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1254 | if (WARN_ON_ONCE(ret)) { |
| 1255 | pr_warning("error on deleting a probe.\n"); |
| 1256 | warn++; |
| 1257 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1258 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1259 | ret = traceprobe_command("-:testprobe2", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1260 | if (WARN_ON_ONCE(ret)) { |
| 1261 | pr_warning("error on deleting a probe.\n"); |
| 1262 | warn++; |
| 1263 | } |
| 1264 | |
| 1265 | end: |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1266 | release_all_trace_probes(); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1267 | if (warn) |
| 1268 | pr_cont("NG: Some tests are failed. Please check them.\n"); |
| 1269 | else |
| 1270 | pr_cont("OK\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1271 | return 0; |
| 1272 | } |
| 1273 | |
| 1274 | late_initcall(kprobe_trace_self_tests_init); |
| 1275 | |
| 1276 | #endif |