Frederic Weisbecker | 47788c5 | 2009-04-08 20:40:59 +0200 | [diff] [blame] | 1 | #include <trace/syscall.h> |
Josh Stone | 1c569f0 | 2009-08-24 14:43:14 -0700 | [diff] [blame] | 2 | #include <trace/events/syscalls.h> |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 3 | #include <linux/syscalls.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 4 | #include <linux/slab.h> |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 5 | #include <linux/kernel.h> |
Paul Gortmaker | 56d82e0 | 2011-05-26 17:53:52 -0400 | [diff] [blame] | 6 | #include <linux/module.h> /* for MODULE_NAME_LEN via KSYM_SYMBOL_LEN */ |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 7 | #include <linux/ftrace.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8 | #include <linux/perf_event.h> |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 9 | #include <asm/syscall.h> |
| 10 | |
| 11 | #include "trace_output.h" |
| 12 | #include "trace.h" |
| 13 | |
Frederic Weisbecker | 5be71b6 | 2009-03-15 22:10:37 +0100 | [diff] [blame] | 14 | static DEFINE_MUTEX(syscall_trace_lock); |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 15 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 16 | static int syscall_enter_register(struct ftrace_event_call *event, |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 17 | enum trace_reg type, void *data); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 18 | static int syscall_exit_register(struct ftrace_event_call *event, |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 19 | enum trace_reg type, void *data); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 20 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 21 | static struct list_head * |
| 22 | syscall_get_enter_fields(struct ftrace_event_call *call) |
| 23 | { |
| 24 | struct syscall_metadata *entry = call->data; |
| 25 | |
| 26 | return &entry->enter_fields; |
| 27 | } |
| 28 | |
Steven Rostedt | 3d56e33 | 2011-02-02 17:06:09 -0500 | [diff] [blame] | 29 | extern struct syscall_metadata *__start_syscalls_metadata[]; |
| 30 | extern struct syscall_metadata *__stop_syscalls_metadata[]; |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 31 | |
| 32 | static struct syscall_metadata **syscalls_metadata; |
| 33 | |
Ian Munsie | b2d5549 | 2011-02-03 14:27:23 +1100 | [diff] [blame] | 34 | #ifndef ARCH_HAS_SYSCALL_MATCH_SYM_NAME |
| 35 | static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) |
| 36 | { |
| 37 | /* |
| 38 | * Only compare after the "sys" prefix. Archs that use |
| 39 | * syscall wrappers may have syscalls symbols aliases prefixed |
zhangwei(Jovi) | 36a78e9 | 2013-03-11 15:13:51 +0800 | [diff] [blame] | 40 | * with ".SyS" or ".sys" instead of "sys", leading to an unwanted |
Ian Munsie | b2d5549 | 2011-02-03 14:27:23 +1100 | [diff] [blame] | 41 | * mismatch. |
| 42 | */ |
| 43 | return !strcmp(sym + 3, name + 3); |
| 44 | } |
| 45 | #endif |
| 46 | |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 47 | #ifdef ARCH_TRACE_IGNORE_COMPAT_SYSCALLS |
| 48 | /* |
| 49 | * Some architectures that allow for 32bit applications |
| 50 | * to run on a 64bit kernel, do not map the syscalls for |
| 51 | * the 32bit tasks the same as they do for 64bit tasks. |
| 52 | * |
| 53 | * *cough*x86*cough* |
| 54 | * |
| 55 | * In such a case, instead of reporting the wrong syscalls, |
| 56 | * simply ignore them. |
| 57 | * |
| 58 | * For an arch to ignore the compat syscalls it needs to |
| 59 | * define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS as well as |
| 60 | * define the function arch_trace_is_compat_syscall() to let |
| 61 | * the tracing system know that it should ignore it. |
| 62 | */ |
| 63 | static int |
| 64 | trace_get_syscall_nr(struct task_struct *task, struct pt_regs *regs) |
| 65 | { |
| 66 | if (unlikely(arch_trace_is_compat_syscall(regs))) |
| 67 | return -1; |
| 68 | |
| 69 | return syscall_get_nr(task, regs); |
| 70 | } |
| 71 | #else |
| 72 | static inline int |
| 73 | trace_get_syscall_nr(struct task_struct *task, struct pt_regs *regs) |
| 74 | { |
| 75 | return syscall_get_nr(task, regs); |
| 76 | } |
| 77 | #endif /* ARCH_TRACE_IGNORE_COMPAT_SYSCALLS */ |
| 78 | |
Steven Rostedt | 3d56e33 | 2011-02-02 17:06:09 -0500 | [diff] [blame] | 79 | static __init struct syscall_metadata * |
| 80 | find_syscall_meta(unsigned long syscall) |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 81 | { |
Steven Rostedt | 3d56e33 | 2011-02-02 17:06:09 -0500 | [diff] [blame] | 82 | struct syscall_metadata **start; |
| 83 | struct syscall_metadata **stop; |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 84 | char str[KSYM_SYMBOL_LEN]; |
| 85 | |
| 86 | |
Steven Rostedt | 3d56e33 | 2011-02-02 17:06:09 -0500 | [diff] [blame] | 87 | start = __start_syscalls_metadata; |
| 88 | stop = __stop_syscalls_metadata; |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 89 | kallsyms_lookup(syscall, NULL, NULL, NULL, str); |
| 90 | |
Ian Munsie | ae07f55 | 2011-02-03 14:27:25 +1100 | [diff] [blame] | 91 | if (arch_syscall_match_sym_name(str, "sys_ni_syscall")) |
| 92 | return NULL; |
| 93 | |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 94 | for ( ; start < stop; start++) { |
Ian Munsie | b2d5549 | 2011-02-03 14:27:23 +1100 | [diff] [blame] | 95 | if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name)) |
Steven Rostedt | 3d56e33 | 2011-02-02 17:06:09 -0500 | [diff] [blame] | 96 | return *start; |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 97 | } |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | static struct syscall_metadata *syscall_nr_to_meta(int nr) |
| 102 | { |
| 103 | if (!syscalls_metadata || nr >= NR_syscalls || nr < 0) |
| 104 | return NULL; |
| 105 | |
| 106 | return syscalls_metadata[nr]; |
| 107 | } |
| 108 | |
Fengguang Wu | 6aea49c | 2012-11-21 15:13:47 +0800 | [diff] [blame] | 109 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 110 | print_syscall_enter(struct trace_iterator *iter, int flags, |
| 111 | struct trace_event *event) |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 112 | { |
| 113 | struct trace_seq *s = &iter->seq; |
| 114 | struct trace_entry *ent = iter->ent; |
| 115 | struct syscall_trace_enter *trace; |
| 116 | struct syscall_metadata *entry; |
| 117 | int i, ret, syscall; |
| 118 | |
Jason Baron | 64c12e0 | 2009-08-10 16:52:53 -0400 | [diff] [blame] | 119 | trace = (typeof(trace))ent; |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 120 | syscall = trace->nr; |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 121 | entry = syscall_nr_to_meta(syscall); |
Jason Baron | 64c12e0 | 2009-08-10 16:52:53 -0400 | [diff] [blame] | 122 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 123 | if (!entry) |
| 124 | goto end; |
| 125 | |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 126 | if (entry->enter_event->event.type != ent->type) { |
Jason Baron | 64c12e0 | 2009-08-10 16:52:53 -0400 | [diff] [blame] | 127 | WARN_ON_ONCE(1); |
| 128 | goto end; |
| 129 | } |
| 130 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 131 | ret = trace_seq_printf(s, "%s(", entry->name); |
| 132 | if (!ret) |
| 133 | return TRACE_TYPE_PARTIAL_LINE; |
| 134 | |
| 135 | for (i = 0; i < entry->nb_args; i++) { |
| 136 | /* parameter types */ |
Li Zefan | ba8b3a4 | 2009-08-17 16:55:18 +0800 | [diff] [blame] | 137 | if (trace_flags & TRACE_ITER_VERBOSE) { |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 138 | ret = trace_seq_printf(s, "%s ", entry->types[i]); |
| 139 | if (!ret) |
| 140 | return TRACE_TYPE_PARTIAL_LINE; |
| 141 | } |
| 142 | /* parameter values */ |
Li Zefan | 4539f07 | 2009-08-20 16:13:35 +0800 | [diff] [blame] | 143 | ret = trace_seq_printf(s, "%s: %lx%s", entry->args[i], |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 144 | trace->args[i], |
Li Zefan | 4539f07 | 2009-08-20 16:13:35 +0800 | [diff] [blame] | 145 | i == entry->nb_args - 1 ? "" : ", "); |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 146 | if (!ret) |
| 147 | return TRACE_TYPE_PARTIAL_LINE; |
| 148 | } |
| 149 | |
Li Zefan | 4539f07 | 2009-08-20 16:13:35 +0800 | [diff] [blame] | 150 | ret = trace_seq_putc(s, ')'); |
| 151 | if (!ret) |
| 152 | return TRACE_TYPE_PARTIAL_LINE; |
| 153 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 154 | end: |
Li Zefan | 4539f07 | 2009-08-20 16:13:35 +0800 | [diff] [blame] | 155 | ret = trace_seq_putc(s, '\n'); |
| 156 | if (!ret) |
| 157 | return TRACE_TYPE_PARTIAL_LINE; |
| 158 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 159 | return TRACE_TYPE_HANDLED; |
| 160 | } |
| 161 | |
Fengguang Wu | 6aea49c | 2012-11-21 15:13:47 +0800 | [diff] [blame] | 162 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 163 | print_syscall_exit(struct trace_iterator *iter, int flags, |
| 164 | struct trace_event *event) |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 165 | { |
| 166 | struct trace_seq *s = &iter->seq; |
| 167 | struct trace_entry *ent = iter->ent; |
| 168 | struct syscall_trace_exit *trace; |
| 169 | int syscall; |
| 170 | struct syscall_metadata *entry; |
| 171 | int ret; |
| 172 | |
Jason Baron | 64c12e0 | 2009-08-10 16:52:53 -0400 | [diff] [blame] | 173 | trace = (typeof(trace))ent; |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 174 | syscall = trace->nr; |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 175 | entry = syscall_nr_to_meta(syscall); |
Jason Baron | 64c12e0 | 2009-08-10 16:52:53 -0400 | [diff] [blame] | 176 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 177 | if (!entry) { |
zhangwei(Jovi) | 146c344 | 2013-07-15 16:32:44 +0800 | [diff] [blame] | 178 | trace_seq_putc(s, '\n'); |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 179 | return TRACE_TYPE_HANDLED; |
| 180 | } |
| 181 | |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 182 | if (entry->exit_event->event.type != ent->type) { |
Jason Baron | 64c12e0 | 2009-08-10 16:52:53 -0400 | [diff] [blame] | 183 | WARN_ON_ONCE(1); |
| 184 | return TRACE_TYPE_UNHANDLED; |
| 185 | } |
| 186 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 187 | ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name, |
| 188 | trace->ret); |
| 189 | if (!ret) |
| 190 | return TRACE_TYPE_PARTIAL_LINE; |
| 191 | |
| 192 | return TRACE_TYPE_HANDLED; |
| 193 | } |
| 194 | |
Li Zefan | e697196 | 2009-08-19 15:52:25 +0800 | [diff] [blame] | 195 | extern char *__bad_type_size(void); |
| 196 | |
| 197 | #define SYSCALL_FIELD(type, name) \ |
| 198 | sizeof(type) != sizeof(trace.name) ? \ |
| 199 | __bad_type_size() : \ |
Tom Zanussi | 26a5074 | 2009-10-06 01:09:50 -0500 | [diff] [blame] | 200 | #type, #name, offsetof(typeof(trace), name), \ |
| 201 | sizeof(trace.name), is_signed_type(type) |
Li Zefan | e697196 | 2009-08-19 15:52:25 +0800 | [diff] [blame] | 202 | |
Li Zefan | 3ddc77f | 2013-03-27 14:15:37 +0800 | [diff] [blame] | 203 | static int __init |
| 204 | __set_enter_print_fmt(struct syscall_metadata *entry, char *buf, int len) |
Lai Jiangshan | 50307a4 | 2009-12-15 15:39:45 +0800 | [diff] [blame] | 205 | { |
| 206 | int i; |
| 207 | int pos = 0; |
| 208 | |
| 209 | /* When len=0, we just calculate the needed length */ |
| 210 | #define LEN_OR_ZERO (len ? len - pos : 0) |
| 211 | |
| 212 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); |
| 213 | for (i = 0; i < entry->nb_args; i++) { |
| 214 | pos += snprintf(buf + pos, LEN_OR_ZERO, "%s: 0x%%0%zulx%s", |
| 215 | entry->args[i], sizeof(unsigned long), |
| 216 | i == entry->nb_args - 1 ? "" : ", "); |
| 217 | } |
| 218 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); |
| 219 | |
| 220 | for (i = 0; i < entry->nb_args; i++) { |
| 221 | pos += snprintf(buf + pos, LEN_OR_ZERO, |
| 222 | ", ((unsigned long)(REC->%s))", entry->args[i]); |
| 223 | } |
| 224 | |
| 225 | #undef LEN_OR_ZERO |
| 226 | |
| 227 | /* return the length of print_fmt */ |
| 228 | return pos; |
| 229 | } |
| 230 | |
Li Zefan | 3ddc77f | 2013-03-27 14:15:37 +0800 | [diff] [blame] | 231 | static int __init set_syscall_print_fmt(struct ftrace_event_call *call) |
Lai Jiangshan | 50307a4 | 2009-12-15 15:39:45 +0800 | [diff] [blame] | 232 | { |
| 233 | char *print_fmt; |
| 234 | int len; |
| 235 | struct syscall_metadata *entry = call->data; |
| 236 | |
| 237 | if (entry->enter_event != call) { |
| 238 | call->print_fmt = "\"0x%lx\", REC->ret"; |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | /* First: called with 0 length to calculate the needed length */ |
| 243 | len = __set_enter_print_fmt(entry, NULL, 0); |
| 244 | |
| 245 | print_fmt = kmalloc(len + 1, GFP_KERNEL); |
| 246 | if (!print_fmt) |
| 247 | return -ENOMEM; |
| 248 | |
| 249 | /* Second: actually write the @print_fmt */ |
| 250 | __set_enter_print_fmt(entry, print_fmt, len + 1); |
| 251 | call->print_fmt = print_fmt; |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
Li Zefan | 3ddc77f | 2013-03-27 14:15:37 +0800 | [diff] [blame] | 256 | static void __init free_syscall_print_fmt(struct ftrace_event_call *call) |
Lai Jiangshan | 50307a4 | 2009-12-15 15:39:45 +0800 | [diff] [blame] | 257 | { |
| 258 | struct syscall_metadata *entry = call->data; |
| 259 | |
| 260 | if (entry->enter_event == call) |
| 261 | kfree(call->print_fmt); |
| 262 | } |
| 263 | |
Li Zefan | b8aae39 | 2013-02-21 10:33:58 +0800 | [diff] [blame] | 264 | static int __init syscall_enter_define_fields(struct ftrace_event_call *call) |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 265 | { |
| 266 | struct syscall_trace_enter trace; |
Lai Jiangshan | 31c16b1 | 2009-12-01 16:23:30 +0800 | [diff] [blame] | 267 | struct syscall_metadata *meta = call->data; |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 268 | int ret; |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 269 | int i; |
| 270 | int offset = offsetof(typeof(trace), args); |
| 271 | |
Lai Jiangshan | 0f1ef51 | 2009-11-26 15:49:33 +0800 | [diff] [blame] | 272 | ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER); |
| 273 | if (ret) |
| 274 | return ret; |
| 275 | |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 276 | for (i = 0; i < meta->nb_args; i++) { |
Frederic Weisbecker | aeaeae1 | 2009-08-27 05:09:51 +0200 | [diff] [blame] | 277 | ret = trace_define_field(call, meta->types[i], |
| 278 | meta->args[i], offset, |
Li Zefan | 43b51ea | 2009-08-07 10:33:22 +0800 | [diff] [blame] | 279 | sizeof(unsigned long), 0, |
| 280 | FILTER_OTHER); |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 281 | offset += sizeof(unsigned long); |
| 282 | } |
| 283 | |
| 284 | return ret; |
| 285 | } |
| 286 | |
Li Zefan | b8aae39 | 2013-02-21 10:33:58 +0800 | [diff] [blame] | 287 | static int __init syscall_exit_define_fields(struct ftrace_event_call *call) |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 288 | { |
| 289 | struct syscall_trace_exit trace; |
| 290 | int ret; |
| 291 | |
Lai Jiangshan | 0f1ef51 | 2009-11-26 15:49:33 +0800 | [diff] [blame] | 292 | ret = trace_define_field(call, SYSCALL_FIELD(int, nr), FILTER_OTHER); |
| 293 | if (ret) |
| 294 | return ret; |
| 295 | |
Tom Zanussi | 26a5074 | 2009-10-06 01:09:50 -0500 | [diff] [blame] | 296 | ret = trace_define_field(call, SYSCALL_FIELD(long, ret), |
Li Zefan | 43b51ea | 2009-08-07 10:33:22 +0800 | [diff] [blame] | 297 | FILTER_OTHER); |
Li Zefan | 540b7b8 | 2009-08-19 15:54:51 +0800 | [diff] [blame] | 298 | |
| 299 | return ret; |
| 300 | } |
| 301 | |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 302 | static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id) |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 303 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 304 | struct trace_array *tr = data; |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 305 | struct ftrace_event_file *ftrace_file; |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 306 | struct syscall_trace_enter *entry; |
| 307 | struct syscall_metadata *sys_data; |
| 308 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 309 | struct ring_buffer *buffer; |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 310 | unsigned long irq_flags; |
| 311 | int pc; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 312 | int syscall_nr; |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 313 | int size; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 314 | |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 315 | syscall_nr = trace_get_syscall_nr(current, regs); |
Hendrik Brueckner | cd0980f | 2009-08-25 14:50:27 +0200 | [diff] [blame] | 316 | if (syscall_nr < 0) |
| 317 | return; |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 318 | |
| 319 | /* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE) */ |
| 320 | ftrace_file = rcu_dereference_sched(tr->enter_syscall_files[syscall_nr]); |
| 321 | if (!ftrace_file) |
| 322 | return; |
| 323 | |
| 324 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 325 | return; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 326 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 327 | sys_data = syscall_nr_to_meta(syscall_nr); |
| 328 | if (!sys_data) |
| 329 | return; |
| 330 | |
| 331 | size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args; |
| 332 | |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 333 | local_save_flags(irq_flags); |
| 334 | pc = preempt_count(); |
| 335 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 336 | buffer = tr->trace_buffer.buffer; |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 337 | event = trace_buffer_lock_reserve(buffer, |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 338 | sys_data->enter_event->event.type, size, irq_flags, pc); |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 339 | if (!event) |
| 340 | return; |
| 341 | |
| 342 | entry = ring_buffer_event_data(event); |
| 343 | entry->nr = syscall_nr; |
| 344 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args); |
| 345 | |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 346 | if (!filter_check_discard(ftrace_file, entry, buffer, event)) |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 347 | trace_current_buffer_unlock_commit(buffer, event, |
| 348 | irq_flags, pc); |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 349 | } |
| 350 | |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 351 | static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret) |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 352 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 353 | struct trace_array *tr = data; |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 354 | struct ftrace_event_file *ftrace_file; |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 355 | struct syscall_trace_exit *entry; |
| 356 | struct syscall_metadata *sys_data; |
| 357 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 358 | struct ring_buffer *buffer; |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 359 | unsigned long irq_flags; |
| 360 | int pc; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 361 | int syscall_nr; |
| 362 | |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 363 | syscall_nr = trace_get_syscall_nr(current, regs); |
Hendrik Brueckner | cd0980f | 2009-08-25 14:50:27 +0200 | [diff] [blame] | 364 | if (syscall_nr < 0) |
| 365 | return; |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 366 | |
| 367 | /* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE()) */ |
| 368 | ftrace_file = rcu_dereference_sched(tr->exit_syscall_files[syscall_nr]); |
| 369 | if (!ftrace_file) |
| 370 | return; |
| 371 | |
| 372 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 373 | return; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 374 | |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 375 | sys_data = syscall_nr_to_meta(syscall_nr); |
| 376 | if (!sys_data) |
| 377 | return; |
| 378 | |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 379 | local_save_flags(irq_flags); |
| 380 | pc = preempt_count(); |
| 381 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 382 | buffer = tr->trace_buffer.buffer; |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 383 | event = trace_buffer_lock_reserve(buffer, |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 384 | sys_data->exit_event->event.type, sizeof(*entry), |
| 385 | irq_flags, pc); |
Frederic Weisbecker | bed1ffc | 2009-03-13 15:42:11 +0100 | [diff] [blame] | 386 | if (!event) |
| 387 | return; |
| 388 | |
| 389 | entry = ring_buffer_event_data(event); |
| 390 | entry->nr = syscall_nr; |
| 391 | entry->ret = syscall_get_return_value(current, regs); |
| 392 | |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 393 | if (!filter_check_discard(ftrace_file, entry, buffer, event)) |
zhangwei(Jovi) | 11034ae | 2013-04-10 11:26:23 +0800 | [diff] [blame] | 394 | trace_current_buffer_unlock_commit(buffer, event, |
| 395 | irq_flags, pc); |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 396 | } |
| 397 | |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 398 | static int reg_event_syscall_enter(struct ftrace_event_file *file, |
| 399 | struct ftrace_event_call *call) |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 400 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 401 | struct trace_array *tr = file->tr; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 402 | int ret = 0; |
| 403 | int num; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 404 | |
Lai Jiangshan | c252f65 | 2009-12-01 16:23:47 +0800 | [diff] [blame] | 405 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Ian Munsie | 3773b389 | 2011-02-03 14:27:21 +1100 | [diff] [blame] | 406 | if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls)) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 407 | return -ENOSYS; |
| 408 | mutex_lock(&syscall_trace_lock); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 409 | if (!tr->sys_refcount_enter) |
| 410 | ret = register_trace_sys_enter(ftrace_syscall_enter, tr); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 411 | if (!ret) { |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 412 | rcu_assign_pointer(tr->enter_syscall_files[num], file); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 413 | tr->sys_refcount_enter++; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 414 | } |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 415 | mutex_unlock(&syscall_trace_lock); |
| 416 | return ret; |
Frederic Weisbecker | ee08c6e | 2009-03-07 05:52:59 +0100 | [diff] [blame] | 417 | } |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 418 | |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 419 | static void unreg_event_syscall_enter(struct ftrace_event_file *file, |
| 420 | struct ftrace_event_call *call) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 421 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 422 | struct trace_array *tr = file->tr; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 423 | int num; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 424 | |
Lai Jiangshan | c252f65 | 2009-12-01 16:23:47 +0800 | [diff] [blame] | 425 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Ian Munsie | 3773b389 | 2011-02-03 14:27:21 +1100 | [diff] [blame] | 426 | if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls)) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 427 | return; |
| 428 | mutex_lock(&syscall_trace_lock); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 429 | tr->sys_refcount_enter--; |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 430 | rcu_assign_pointer(tr->enter_syscall_files[num], NULL); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 431 | if (!tr->sys_refcount_enter) |
| 432 | unregister_trace_sys_enter(ftrace_syscall_enter, tr); |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 433 | mutex_unlock(&syscall_trace_lock); |
| 434 | } |
| 435 | |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 436 | static int reg_event_syscall_exit(struct ftrace_event_file *file, |
| 437 | struct ftrace_event_call *call) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 438 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 439 | struct trace_array *tr = file->tr; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 440 | int ret = 0; |
| 441 | int num; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 442 | |
Lai Jiangshan | c252f65 | 2009-12-01 16:23:47 +0800 | [diff] [blame] | 443 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Ian Munsie | 3773b389 | 2011-02-03 14:27:21 +1100 | [diff] [blame] | 444 | if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls)) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 445 | return -ENOSYS; |
| 446 | mutex_lock(&syscall_trace_lock); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 447 | if (!tr->sys_refcount_exit) |
| 448 | ret = register_trace_sys_exit(ftrace_syscall_exit, tr); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 449 | if (!ret) { |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 450 | rcu_assign_pointer(tr->exit_syscall_files[num], file); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 451 | tr->sys_refcount_exit++; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 452 | } |
| 453 | mutex_unlock(&syscall_trace_lock); |
| 454 | return ret; |
| 455 | } |
| 456 | |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 457 | static void unreg_event_syscall_exit(struct ftrace_event_file *file, |
| 458 | struct ftrace_event_call *call) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 459 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 460 | struct trace_array *tr = file->tr; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 461 | int num; |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 462 | |
Lai Jiangshan | c252f65 | 2009-12-01 16:23:47 +0800 | [diff] [blame] | 463 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Ian Munsie | 3773b389 | 2011-02-03 14:27:21 +1100 | [diff] [blame] | 464 | if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls)) |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 465 | return; |
| 466 | mutex_lock(&syscall_trace_lock); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 467 | tr->sys_refcount_exit--; |
Tom Zanussi | d562aff | 2013-10-24 08:34:19 -0500 | [diff] [blame] | 468 | rcu_assign_pointer(tr->exit_syscall_files[num], NULL); |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 469 | if (!tr->sys_refcount_exit) |
| 470 | unregister_trace_sys_exit(ftrace_syscall_exit, tr); |
Jason Baron | fb34a08 | 2009-08-10 16:52:47 -0400 | [diff] [blame] | 471 | mutex_unlock(&syscall_trace_lock); |
| 472 | } |
| 473 | |
Li Zefan | 3ddc77f | 2013-03-27 14:15:37 +0800 | [diff] [blame] | 474 | static int __init init_syscall_trace(struct ftrace_event_call *call) |
Lai Jiangshan | a1301da | 2009-12-01 16:23:55 +0800 | [diff] [blame] | 475 | { |
| 476 | int id; |
Ian Munsie | ba97697 | 2011-02-03 14:27:20 +1100 | [diff] [blame] | 477 | int num; |
| 478 | |
| 479 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
| 480 | if (num < 0 || num >= NR_syscalls) { |
| 481 | pr_debug("syscall %s metadata not mapped, disabling ftrace event\n", |
| 482 | ((struct syscall_metadata *)call->data)->name); |
| 483 | return -ENOSYS; |
| 484 | } |
Lai Jiangshan | a1301da | 2009-12-01 16:23:55 +0800 | [diff] [blame] | 485 | |
Lai Jiangshan | 50307a4 | 2009-12-15 15:39:45 +0800 | [diff] [blame] | 486 | if (set_syscall_print_fmt(call) < 0) |
| 487 | return -ENOMEM; |
| 488 | |
Steven Rostedt | c7ef3a9 | 2009-12-28 21:13:59 -0500 | [diff] [blame] | 489 | id = trace_event_raw_init(call); |
| 490 | |
| 491 | if (id < 0) { |
Lai Jiangshan | 50307a4 | 2009-12-15 15:39:45 +0800 | [diff] [blame] | 492 | free_syscall_print_fmt(call); |
Steven Rostedt | c7ef3a9 | 2009-12-28 21:13:59 -0500 | [diff] [blame] | 493 | return id; |
Lai Jiangshan | 50307a4 | 2009-12-15 15:39:45 +0800 | [diff] [blame] | 494 | } |
Steven Rostedt | c7ef3a9 | 2009-12-28 21:13:59 -0500 | [diff] [blame] | 495 | |
| 496 | return id; |
Lai Jiangshan | a1301da | 2009-12-01 16:23:55 +0800 | [diff] [blame] | 497 | } |
| 498 | |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 499 | struct trace_event_functions enter_syscall_print_funcs = { |
| 500 | .trace = print_syscall_enter, |
| 501 | }; |
| 502 | |
| 503 | struct trace_event_functions exit_syscall_print_funcs = { |
| 504 | .trace = print_syscall_exit, |
| 505 | }; |
| 506 | |
Li Zefan | 523c811 | 2013-03-04 14:15:59 +0800 | [diff] [blame] | 507 | struct ftrace_event_class __refdata event_class_syscall_enter = { |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 508 | .system = "syscalls", |
| 509 | .reg = syscall_enter_register, |
| 510 | .define_fields = syscall_enter_define_fields, |
| 511 | .get_fields = syscall_get_enter_fields, |
| 512 | .raw_init = init_syscall_trace, |
| 513 | }; |
| 514 | |
Li Zefan | 523c811 | 2013-03-04 14:15:59 +0800 | [diff] [blame] | 515 | struct ftrace_event_class __refdata event_class_syscall_exit = { |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 516 | .system = "syscalls", |
| 517 | .reg = syscall_exit_register, |
| 518 | .define_fields = syscall_exit_define_fields, |
| 519 | .fields = LIST_HEAD_INIT(event_class_syscall_exit.fields), |
| 520 | .raw_init = init_syscall_trace, |
| 521 | }; |
| 522 | |
Ian Munsie | c763ba0 | 2011-02-03 14:27:22 +1100 | [diff] [blame] | 523 | unsigned long __init __weak arch_syscall_addr(int nr) |
Mike Frysinger | e7b8e67 | 2010-01-26 04:40:03 -0500 | [diff] [blame] | 524 | { |
| 525 | return (unsigned long)sys_call_table[nr]; |
| 526 | } |
| 527 | |
Fengguang Wu | 6aea49c | 2012-11-21 15:13:47 +0800 | [diff] [blame] | 528 | static int __init init_ftrace_syscalls(void) |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 529 | { |
| 530 | struct syscall_metadata *meta; |
| 531 | unsigned long addr; |
| 532 | int i; |
| 533 | |
Thomas Meyer | 47b0edc | 2011-11-29 22:08:00 +0100 | [diff] [blame] | 534 | syscalls_metadata = kcalloc(NR_syscalls, sizeof(*syscalls_metadata), |
| 535 | GFP_KERNEL); |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 536 | if (!syscalls_metadata) { |
| 537 | WARN_ON(1); |
| 538 | return -ENOMEM; |
| 539 | } |
| 540 | |
| 541 | for (i = 0; i < NR_syscalls; i++) { |
| 542 | addr = arch_syscall_addr(i); |
| 543 | meta = find_syscall_meta(addr); |
Lai Jiangshan | c252f65 | 2009-12-01 16:23:47 +0800 | [diff] [blame] | 544 | if (!meta) |
| 545 | continue; |
| 546 | |
| 547 | meta->syscall_nr = i; |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 548 | syscalls_metadata[i] = meta; |
| 549 | } |
| 550 | |
| 551 | return 0; |
| 552 | } |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 553 | early_initcall(init_ftrace_syscalls); |
Frederic Weisbecker | c44fc77 | 2009-09-19 06:50:42 +0200 | [diff] [blame] | 554 | |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 555 | #ifdef CONFIG_PERF_EVENTS |
Frederic Weisbecker | 19007a6 | 2009-08-11 20:22:53 +0200 | [diff] [blame] | 556 | |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 557 | static DECLARE_BITMAP(enabled_perf_enter_syscalls, NR_syscalls); |
| 558 | static DECLARE_BITMAP(enabled_perf_exit_syscalls, NR_syscalls); |
| 559 | static int sys_perf_refcount_enter; |
| 560 | static int sys_perf_refcount_exit; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 561 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 562 | static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 563 | { |
| 564 | struct syscall_metadata *sys_data; |
Frederic Weisbecker | 20ab4425 | 2009-09-18 06:10:28 +0200 | [diff] [blame] | 565 | struct syscall_trace_enter *rec; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 566 | struct hlist_head *head; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 567 | int syscall_nr; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 568 | int rctx; |
Frederic Weisbecker | 19007a6 | 2009-08-11 20:22:53 +0200 | [diff] [blame] | 569 | int size; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 570 | |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 571 | syscall_nr = trace_get_syscall_nr(current, regs); |
Will Deacon | 60916a9 | 2012-08-16 18:14:14 +0100 | [diff] [blame] | 572 | if (syscall_nr < 0) |
| 573 | return; |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 574 | if (!test_bit(syscall_nr, enabled_perf_enter_syscalls)) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 575 | return; |
| 576 | |
| 577 | sys_data = syscall_nr_to_meta(syscall_nr); |
| 578 | if (!sys_data) |
| 579 | return; |
| 580 | |
Oleg Nesterov | 421c786 | 2013-06-17 19:02:07 +0200 | [diff] [blame] | 581 | head = this_cpu_ptr(sys_data->enter_event->perf_events); |
| 582 | if (hlist_empty(head)) |
| 583 | return; |
| 584 | |
Frederic Weisbecker | 19007a6 | 2009-08-11 20:22:53 +0200 | [diff] [blame] | 585 | /* get the size after alignment with the u32 buffer size field */ |
| 586 | size = sizeof(unsigned long) * sys_data->nb_args + sizeof(*rec); |
| 587 | size = ALIGN(size + sizeof(u32), sizeof(u64)); |
| 588 | size -= sizeof(u32); |
| 589 | |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 590 | rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size, |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 591 | sys_data->enter_event->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 592 | if (!rec) |
| 593 | return; |
Frederic Weisbecker | 19007a6 | 2009-08-11 20:22:53 +0200 | [diff] [blame] | 594 | |
Frederic Weisbecker | 20ab4425 | 2009-09-18 06:10:28 +0200 | [diff] [blame] | 595 | rec->nr = syscall_nr; |
| 596 | syscall_get_arguments(current, regs, 0, sys_data->nb_args, |
| 597 | (unsigned long *)&rec->args); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 598 | perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head, NULL); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 599 | } |
| 600 | |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 601 | static int perf_sysenter_enable(struct ftrace_event_call *call) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 602 | { |
| 603 | int ret = 0; |
| 604 | int num; |
| 605 | |
Lai Jiangshan | 3bbe84e | 2009-12-01 16:24:01 +0800 | [diff] [blame] | 606 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 607 | |
| 608 | mutex_lock(&syscall_trace_lock); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 609 | if (!sys_perf_refcount_enter) |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 610 | ret = register_trace_sys_enter(perf_syscall_enter, NULL); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 611 | if (ret) { |
| 612 | pr_info("event trace: Could not activate" |
| 613 | "syscall entry trace point"); |
| 614 | } else { |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 615 | set_bit(num, enabled_perf_enter_syscalls); |
| 616 | sys_perf_refcount_enter++; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 617 | } |
| 618 | mutex_unlock(&syscall_trace_lock); |
| 619 | return ret; |
| 620 | } |
| 621 | |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 622 | static void perf_sysenter_disable(struct ftrace_event_call *call) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 623 | { |
| 624 | int num; |
| 625 | |
Lai Jiangshan | 3bbe84e | 2009-12-01 16:24:01 +0800 | [diff] [blame] | 626 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 627 | |
| 628 | mutex_lock(&syscall_trace_lock); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 629 | sys_perf_refcount_enter--; |
| 630 | clear_bit(num, enabled_perf_enter_syscalls); |
| 631 | if (!sys_perf_refcount_enter) |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 632 | unregister_trace_sys_enter(perf_syscall_enter, NULL); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 633 | mutex_unlock(&syscall_trace_lock); |
| 634 | } |
| 635 | |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 636 | static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 637 | { |
| 638 | struct syscall_metadata *sys_data; |
Frederic Weisbecker | 20ab4425 | 2009-09-18 06:10:28 +0200 | [diff] [blame] | 639 | struct syscall_trace_exit *rec; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 640 | struct hlist_head *head; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 641 | int syscall_nr; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 642 | int rctx; |
Frederic Weisbecker | 20ab4425 | 2009-09-18 06:10:28 +0200 | [diff] [blame] | 643 | int size; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 644 | |
Steven Rostedt | f431b63 | 2013-02-12 16:18:59 -0500 | [diff] [blame] | 645 | syscall_nr = trace_get_syscall_nr(current, regs); |
Will Deacon | 60916a9 | 2012-08-16 18:14:14 +0100 | [diff] [blame] | 646 | if (syscall_nr < 0) |
| 647 | return; |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 648 | if (!test_bit(syscall_nr, enabled_perf_exit_syscalls)) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 649 | return; |
| 650 | |
| 651 | sys_data = syscall_nr_to_meta(syscall_nr); |
| 652 | if (!sys_data) |
| 653 | return; |
| 654 | |
Oleg Nesterov | 421c786 | 2013-06-17 19:02:07 +0200 | [diff] [blame] | 655 | head = this_cpu_ptr(sys_data->exit_event->perf_events); |
| 656 | if (hlist_empty(head)) |
| 657 | return; |
| 658 | |
Frederic Weisbecker | 20ab4425 | 2009-09-18 06:10:28 +0200 | [diff] [blame] | 659 | /* We can probably do that at build time */ |
| 660 | size = ALIGN(sizeof(*rec) + sizeof(u32), sizeof(u64)); |
| 661 | size -= sizeof(u32); |
Frederic Weisbecker | 19007a6 | 2009-08-11 20:22:53 +0200 | [diff] [blame] | 662 | |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 663 | rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size, |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 664 | sys_data->exit_event->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 665 | if (!rec) |
| 666 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 667 | |
Frederic Weisbecker | 20ab4425 | 2009-09-18 06:10:28 +0200 | [diff] [blame] | 668 | rec->nr = syscall_nr; |
| 669 | rec->ret = syscall_get_return_value(current, regs); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 670 | perf_trace_buf_submit(rec, size, rctx, 0, 1, regs, head, NULL); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 671 | } |
| 672 | |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 673 | static int perf_sysexit_enable(struct ftrace_event_call *call) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 674 | { |
| 675 | int ret = 0; |
| 676 | int num; |
| 677 | |
Lai Jiangshan | 3bbe84e | 2009-12-01 16:24:01 +0800 | [diff] [blame] | 678 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 679 | |
| 680 | mutex_lock(&syscall_trace_lock); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 681 | if (!sys_perf_refcount_exit) |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 682 | ret = register_trace_sys_exit(perf_syscall_exit, NULL); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 683 | if (ret) { |
| 684 | pr_info("event trace: Could not activate" |
Wenji Huang | 6574658 | 2010-02-24 15:40:22 +0800 | [diff] [blame] | 685 | "syscall exit trace point"); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 686 | } else { |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 687 | set_bit(num, enabled_perf_exit_syscalls); |
| 688 | sys_perf_refcount_exit++; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 689 | } |
| 690 | mutex_unlock(&syscall_trace_lock); |
| 691 | return ret; |
| 692 | } |
| 693 | |
Vaibhav Nagarnaik | 6f86ab9 | 2012-06-07 16:46:25 -0700 | [diff] [blame] | 694 | static void perf_sysexit_disable(struct ftrace_event_call *call) |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 695 | { |
| 696 | int num; |
| 697 | |
Lai Jiangshan | 3bbe84e | 2009-12-01 16:24:01 +0800 | [diff] [blame] | 698 | num = ((struct syscall_metadata *)call->data)->syscall_nr; |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 699 | |
| 700 | mutex_lock(&syscall_trace_lock); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 701 | sys_perf_refcount_exit--; |
| 702 | clear_bit(num, enabled_perf_exit_syscalls); |
| 703 | if (!sys_perf_refcount_exit) |
Steven Rostedt | 38516ab | 2010-04-20 17:04:50 -0400 | [diff] [blame] | 704 | unregister_trace_sys_exit(perf_syscall_exit, NULL); |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 705 | mutex_unlock(&syscall_trace_lock); |
| 706 | } |
| 707 | |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 708 | #endif /* CONFIG_PERF_EVENTS */ |
Jason Baron | f4b5ffc | 2009-08-10 16:53:02 -0400 | [diff] [blame] | 709 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 710 | static int syscall_enter_register(struct ftrace_event_call *event, |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 711 | enum trace_reg type, void *data) |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 712 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 713 | struct ftrace_event_file *file = data; |
| 714 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 715 | switch (type) { |
| 716 | case TRACE_REG_REGISTER: |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 717 | return reg_event_syscall_enter(file, event); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 718 | case TRACE_REG_UNREGISTER: |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 719 | unreg_event_syscall_enter(file, event); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 720 | return 0; |
| 721 | |
| 722 | #ifdef CONFIG_PERF_EVENTS |
| 723 | case TRACE_REG_PERF_REGISTER: |
| 724 | return perf_sysenter_enable(event); |
| 725 | case TRACE_REG_PERF_UNREGISTER: |
| 726 | perf_sysenter_disable(event); |
| 727 | return 0; |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 728 | case TRACE_REG_PERF_OPEN: |
| 729 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 730 | case TRACE_REG_PERF_ADD: |
| 731 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 732 | return 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 733 | #endif |
| 734 | } |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static int syscall_exit_register(struct ftrace_event_call *event, |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 739 | enum trace_reg type, void *data) |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 740 | { |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 741 | struct ftrace_event_file *file = data; |
| 742 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 743 | switch (type) { |
| 744 | case TRACE_REG_REGISTER: |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 745 | return reg_event_syscall_exit(file, event); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 746 | case TRACE_REG_UNREGISTER: |
Steven Rostedt | 12ab74e | 2012-08-08 14:48:20 -0400 | [diff] [blame] | 747 | unreg_event_syscall_exit(file, event); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 748 | return 0; |
| 749 | |
| 750 | #ifdef CONFIG_PERF_EVENTS |
| 751 | case TRACE_REG_PERF_REGISTER: |
| 752 | return perf_sysexit_enable(event); |
| 753 | case TRACE_REG_PERF_UNREGISTER: |
| 754 | perf_sysexit_disable(event); |
| 755 | return 0; |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 756 | case TRACE_REG_PERF_OPEN: |
| 757 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 758 | case TRACE_REG_PERF_ADD: |
| 759 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 760 | return 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 761 | #endif |
| 762 | } |
| 763 | return 0; |
| 764 | } |