1 // SPDX-License-Identifier: GPL-2.0
2 #include <trace/syscall.h>
3 #include <trace/events/syscalls.h>
4 #include <linux/syscalls.h>
5 #include <linux/slab.h>
6 #include <linux/kernel.h>
7 #include <linux/module.h> /* for MODULE_NAME_LEN via KSYM_SYMBOL_LEN */
8 #include <linux/ftrace.h>
9 #include <linux/perf_event.h>
10 #include <linux/xarray.h>
11 #include <asm/syscall.h>
13 #include "trace_output.h"
16 static DEFINE_MUTEX(syscall_trace_lock
);
18 static int syscall_enter_register(struct trace_event_call
*event
,
19 enum trace_reg type
, void *data
);
20 static int syscall_exit_register(struct trace_event_call
*event
,
21 enum trace_reg type
, void *data
);
23 static struct list_head
*
24 syscall_get_enter_fields(struct trace_event_call
*call
)
26 struct syscall_metadata
*entry
= call
->data
;
28 return &entry
->enter_fields
;
31 extern struct syscall_metadata
*__start_syscalls_metadata
[];
32 extern struct syscall_metadata
*__stop_syscalls_metadata
[];
34 static DEFINE_XARRAY(syscalls_metadata_sparse
);
35 static struct syscall_metadata
**syscalls_metadata
;
37 #ifndef ARCH_HAS_SYSCALL_MATCH_SYM_NAME
38 static inline bool arch_syscall_match_sym_name(const char *sym
, const char *name
)
41 * Only compare after the "sys" prefix. Archs that use
42 * syscall wrappers may have syscalls symbols aliases prefixed
43 * with ".SyS" or ".sys" instead of "sys", leading to an unwanted
46 return !strcmp(sym
+ 3, name
+ 3);
50 #ifdef ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
52 * Some architectures that allow for 32bit applications
53 * to run on a 64bit kernel, do not map the syscalls for
54 * the 32bit tasks the same as they do for 64bit tasks.
58 * In such a case, instead of reporting the wrong syscalls,
61 * For an arch to ignore the compat syscalls it needs to
62 * define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS as well as
63 * define the function arch_trace_is_compat_syscall() to let
64 * the tracing system know that it should ignore it.
67 trace_get_syscall_nr(struct task_struct
*task
, struct pt_regs
*regs
)
69 if (unlikely(arch_trace_is_compat_syscall(regs
)))
72 return syscall_get_nr(task
, regs
);
76 trace_get_syscall_nr(struct task_struct
*task
, struct pt_regs
*regs
)
78 return syscall_get_nr(task
, regs
);
80 #endif /* ARCH_TRACE_IGNORE_COMPAT_SYSCALLS */
82 static __init
struct syscall_metadata
*
83 find_syscall_meta(unsigned long syscall
)
85 struct syscall_metadata
**start
;
86 struct syscall_metadata
**stop
;
87 char str
[KSYM_SYMBOL_LEN
];
90 start
= __start_syscalls_metadata
;
91 stop
= __stop_syscalls_metadata
;
92 kallsyms_lookup(syscall
, NULL
, NULL
, NULL
, str
);
94 if (arch_syscall_match_sym_name(str
, "sys_ni_syscall"))
97 for ( ; start
< stop
; start
++) {
98 if ((*start
)->name
&& arch_syscall_match_sym_name(str
, (*start
)->name
))
104 static struct syscall_metadata
*syscall_nr_to_meta(int nr
)
106 if (IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR
))
107 return xa_load(&syscalls_metadata_sparse
, (unsigned long)nr
);
109 if (!syscalls_metadata
|| nr
>= NR_syscalls
|| nr
< 0)
112 return syscalls_metadata
[nr
];
115 const char *get_syscall_name(int syscall
)
117 struct syscall_metadata
*entry
;
119 entry
= syscall_nr_to_meta(syscall
);
126 static enum print_line_t
127 print_syscall_enter(struct trace_iterator
*iter
, int flags
,
128 struct trace_event
*event
)
130 struct trace_array
*tr
= iter
->tr
;
131 struct trace_seq
*s
= &iter
->seq
;
132 struct trace_entry
*ent
= iter
->ent
;
133 struct syscall_trace_enter
*trace
;
134 struct syscall_metadata
*entry
;
137 trace
= (typeof(trace
))ent
;
139 entry
= syscall_nr_to_meta(syscall
);
144 if (entry
->enter_event
->event
.type
!= ent
->type
) {
149 trace_seq_printf(s
, "%s(", entry
->name
);
151 for (i
= 0; i
< entry
->nb_args
; i
++) {
153 if (trace_seq_has_overflowed(s
))
156 /* parameter types */
157 if (tr
->trace_flags
& TRACE_ITER_VERBOSE
)
158 trace_seq_printf(s
, "%s ", entry
->types
[i
]);
160 /* parameter values */
161 trace_seq_printf(s
, "%s: %lx%s", entry
->args
[i
],
163 i
== entry
->nb_args
- 1 ? "" : ", ");
166 trace_seq_putc(s
, ')');
168 trace_seq_putc(s
, '\n');
170 return trace_handle_return(s
);
173 static enum print_line_t
174 print_syscall_exit(struct trace_iterator
*iter
, int flags
,
175 struct trace_event
*event
)
177 struct trace_seq
*s
= &iter
->seq
;
178 struct trace_entry
*ent
= iter
->ent
;
179 struct syscall_trace_exit
*trace
;
181 struct syscall_metadata
*entry
;
183 trace
= (typeof(trace
))ent
;
185 entry
= syscall_nr_to_meta(syscall
);
188 trace_seq_putc(s
, '\n');
192 if (entry
->exit_event
->event
.type
!= ent
->type
) {
194 return TRACE_TYPE_UNHANDLED
;
197 trace_seq_printf(s
, "%s -> 0x%lx\n", entry
->name
,
201 return trace_handle_return(s
);
204 extern char *__bad_type_size(void);
206 #define SYSCALL_FIELD(type, field, name) \
207 sizeof(type) != sizeof(trace.field) ? \
208 __bad_type_size() : \
209 #type, #name, offsetof(typeof(trace), field), \
210 sizeof(trace.field), is_signed_type(type)
213 __set_enter_print_fmt(struct syscall_metadata
*entry
, char *buf
, int len
)
218 /* When len=0, we just calculate the needed length */
219 #define LEN_OR_ZERO (len ? len - pos : 0)
221 pos
+= snprintf(buf
+ pos
, LEN_OR_ZERO
, "\"");
222 for (i
= 0; i
< entry
->nb_args
; i
++) {
223 pos
+= snprintf(buf
+ pos
, LEN_OR_ZERO
, "%s: 0x%%0%zulx%s",
224 entry
->args
[i
], sizeof(unsigned long),
225 i
== entry
->nb_args
- 1 ? "" : ", ");
227 pos
+= snprintf(buf
+ pos
, LEN_OR_ZERO
, "\"");
229 for (i
= 0; i
< entry
->nb_args
; i
++) {
230 pos
+= snprintf(buf
+ pos
, LEN_OR_ZERO
,
231 ", ((unsigned long)(REC->%s))", entry
->args
[i
]);
236 /* return the length of print_fmt */
240 static int __init
set_syscall_print_fmt(struct trace_event_call
*call
)
244 struct syscall_metadata
*entry
= call
->data
;
246 if (entry
->enter_event
!= call
) {
247 call
->print_fmt
= "\"0x%lx\", REC->ret";
251 /* First: called with 0 length to calculate the needed length */
252 len
= __set_enter_print_fmt(entry
, NULL
, 0);
254 print_fmt
= kmalloc(len
+ 1, GFP_KERNEL
);
258 /* Second: actually write the @print_fmt */
259 __set_enter_print_fmt(entry
, print_fmt
, len
+ 1);
260 call
->print_fmt
= print_fmt
;
265 static void __init
free_syscall_print_fmt(struct trace_event_call
*call
)
267 struct syscall_metadata
*entry
= call
->data
;
269 if (entry
->enter_event
== call
)
270 kfree(call
->print_fmt
);
273 static int __init
syscall_enter_define_fields(struct trace_event_call
*call
)
275 struct syscall_trace_enter trace
;
276 struct syscall_metadata
*meta
= call
->data
;
279 int offset
= offsetof(typeof(trace
), args
);
281 ret
= trace_define_field(call
, SYSCALL_FIELD(int, nr
, __syscall_nr
),
286 for (i
= 0; i
< meta
->nb_args
; i
++) {
287 ret
= trace_define_field(call
, meta
->types
[i
],
288 meta
->args
[i
], offset
,
289 sizeof(unsigned long), 0,
291 offset
+= sizeof(unsigned long);
297 static int __init
syscall_exit_define_fields(struct trace_event_call
*call
)
299 struct syscall_trace_exit trace
;
302 ret
= trace_define_field(call
, SYSCALL_FIELD(int, nr
, __syscall_nr
),
307 ret
= trace_define_field(call
, SYSCALL_FIELD(long, ret
, ret
),
313 static void ftrace_syscall_enter(void *data
, struct pt_regs
*regs
, long id
)
315 struct trace_array
*tr
= data
;
316 struct trace_event_file
*trace_file
;
317 struct syscall_trace_enter
*entry
;
318 struct syscall_metadata
*sys_data
;
319 struct ring_buffer_event
*event
;
320 struct ring_buffer
*buffer
;
321 unsigned long irq_flags
;
322 unsigned long args
[6];
327 syscall_nr
= trace_get_syscall_nr(current
, regs
);
328 if (syscall_nr
< 0 || syscall_nr
>= NR_syscalls
)
331 /* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE) */
332 trace_file
= rcu_dereference_sched(tr
->enter_syscall_files
[syscall_nr
]);
336 if (trace_trigger_soft_disabled(trace_file
))
339 sys_data
= syscall_nr_to_meta(syscall_nr
);
343 size
= sizeof(*entry
) + sizeof(unsigned long) * sys_data
->nb_args
;
345 local_save_flags(irq_flags
);
346 pc
= preempt_count();
348 buffer
= tr
->trace_buffer
.buffer
;
349 event
= trace_buffer_lock_reserve(buffer
,
350 sys_data
->enter_event
->event
.type
, size
, irq_flags
, pc
);
354 entry
= ring_buffer_event_data(event
);
355 entry
->nr
= syscall_nr
;
356 syscall_get_arguments(current
, regs
, args
);
357 memcpy(entry
->args
, args
, sizeof(unsigned long) * sys_data
->nb_args
);
359 event_trigger_unlock_commit(trace_file
, buffer
, event
, entry
,
363 static void ftrace_syscall_exit(void *data
, struct pt_regs
*regs
, long ret
)
365 struct trace_array
*tr
= data
;
366 struct trace_event_file
*trace_file
;
367 struct syscall_trace_exit
*entry
;
368 struct syscall_metadata
*sys_data
;
369 struct ring_buffer_event
*event
;
370 struct ring_buffer
*buffer
;
371 unsigned long irq_flags
;
375 syscall_nr
= trace_get_syscall_nr(current
, regs
);
376 if (syscall_nr
< 0 || syscall_nr
>= NR_syscalls
)
379 /* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE()) */
380 trace_file
= rcu_dereference_sched(tr
->exit_syscall_files
[syscall_nr
]);
384 if (trace_trigger_soft_disabled(trace_file
))
387 sys_data
= syscall_nr_to_meta(syscall_nr
);
391 local_save_flags(irq_flags
);
392 pc
= preempt_count();
394 buffer
= tr
->trace_buffer
.buffer
;
395 event
= trace_buffer_lock_reserve(buffer
,
396 sys_data
->exit_event
->event
.type
, sizeof(*entry
),
401 entry
= ring_buffer_event_data(event
);
402 entry
->nr
= syscall_nr
;
403 entry
->ret
= syscall_get_return_value(current
, regs
);
405 event_trigger_unlock_commit(trace_file
, buffer
, event
, entry
,
409 static int reg_event_syscall_enter(struct trace_event_file
*file
,
410 struct trace_event_call
*call
)
412 struct trace_array
*tr
= file
->tr
;
416 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
417 if (WARN_ON_ONCE(num
< 0 || num
>= NR_syscalls
))
419 mutex_lock(&syscall_trace_lock
);
420 if (!tr
->sys_refcount_enter
)
421 ret
= register_trace_sys_enter(ftrace_syscall_enter
, tr
);
423 rcu_assign_pointer(tr
->enter_syscall_files
[num
], file
);
424 tr
->sys_refcount_enter
++;
426 mutex_unlock(&syscall_trace_lock
);
430 static void unreg_event_syscall_enter(struct trace_event_file
*file
,
431 struct trace_event_call
*call
)
433 struct trace_array
*tr
= file
->tr
;
436 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
437 if (WARN_ON_ONCE(num
< 0 || num
>= NR_syscalls
))
439 mutex_lock(&syscall_trace_lock
);
440 tr
->sys_refcount_enter
--;
441 RCU_INIT_POINTER(tr
->enter_syscall_files
[num
], NULL
);
442 if (!tr
->sys_refcount_enter
)
443 unregister_trace_sys_enter(ftrace_syscall_enter
, tr
);
444 mutex_unlock(&syscall_trace_lock
);
447 static int reg_event_syscall_exit(struct trace_event_file
*file
,
448 struct trace_event_call
*call
)
450 struct trace_array
*tr
= file
->tr
;
454 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
455 if (WARN_ON_ONCE(num
< 0 || num
>= NR_syscalls
))
457 mutex_lock(&syscall_trace_lock
);
458 if (!tr
->sys_refcount_exit
)
459 ret
= register_trace_sys_exit(ftrace_syscall_exit
, tr
);
461 rcu_assign_pointer(tr
->exit_syscall_files
[num
], file
);
462 tr
->sys_refcount_exit
++;
464 mutex_unlock(&syscall_trace_lock
);
468 static void unreg_event_syscall_exit(struct trace_event_file
*file
,
469 struct trace_event_call
*call
)
471 struct trace_array
*tr
= file
->tr
;
474 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
475 if (WARN_ON_ONCE(num
< 0 || num
>= NR_syscalls
))
477 mutex_lock(&syscall_trace_lock
);
478 tr
->sys_refcount_exit
--;
479 RCU_INIT_POINTER(tr
->exit_syscall_files
[num
], NULL
);
480 if (!tr
->sys_refcount_exit
)
481 unregister_trace_sys_exit(ftrace_syscall_exit
, tr
);
482 mutex_unlock(&syscall_trace_lock
);
485 static int __init
init_syscall_trace(struct trace_event_call
*call
)
490 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
491 if (num
< 0 || num
>= NR_syscalls
) {
492 pr_debug("syscall %s metadata not mapped, disabling ftrace event\n",
493 ((struct syscall_metadata
*)call
->data
)->name
);
497 if (set_syscall_print_fmt(call
) < 0)
500 id
= trace_event_raw_init(call
);
503 free_syscall_print_fmt(call
);
510 struct trace_event_functions enter_syscall_print_funcs
= {
511 .trace
= print_syscall_enter
,
514 struct trace_event_functions exit_syscall_print_funcs
= {
515 .trace
= print_syscall_exit
,
518 struct trace_event_class __refdata event_class_syscall_enter
= {
519 .system
= "syscalls",
520 .reg
= syscall_enter_register
,
521 .define_fields
= syscall_enter_define_fields
,
522 .get_fields
= syscall_get_enter_fields
,
523 .raw_init
= init_syscall_trace
,
526 struct trace_event_class __refdata event_class_syscall_exit
= {
527 .system
= "syscalls",
528 .reg
= syscall_exit_register
,
529 .define_fields
= syscall_exit_define_fields
,
530 .fields
= LIST_HEAD_INIT(event_class_syscall_exit
.fields
),
531 .raw_init
= init_syscall_trace
,
534 unsigned long __init __weak
arch_syscall_addr(int nr
)
536 return (unsigned long)sys_call_table
[nr
];
539 void __init
init_ftrace_syscalls(void)
541 struct syscall_metadata
*meta
;
546 if (!IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR
)) {
547 syscalls_metadata
= kcalloc(NR_syscalls
,
548 sizeof(*syscalls_metadata
),
550 if (!syscalls_metadata
) {
556 for (i
= 0; i
< NR_syscalls
; i
++) {
557 addr
= arch_syscall_addr(i
);
558 meta
= find_syscall_meta(addr
);
562 meta
->syscall_nr
= i
;
564 if (!IS_ENABLED(CONFIG_HAVE_SPARSE_SYSCALL_NR
)) {
565 syscalls_metadata
[i
] = meta
;
567 ret
= xa_store(&syscalls_metadata_sparse
, i
, meta
,
570 "Syscall memory allocation failed\n");
576 #ifdef CONFIG_PERF_EVENTS
578 static DECLARE_BITMAP(enabled_perf_enter_syscalls
, NR_syscalls
);
579 static DECLARE_BITMAP(enabled_perf_exit_syscalls
, NR_syscalls
);
580 static int sys_perf_refcount_enter
;
581 static int sys_perf_refcount_exit
;
583 static int perf_call_bpf_enter(struct trace_event_call
*call
, struct pt_regs
*regs
,
584 struct syscall_metadata
*sys_data
,
585 struct syscall_trace_enter
*rec
)
587 struct syscall_tp_t
{
588 unsigned long long regs
;
589 unsigned long syscall_nr
;
590 unsigned long args
[SYSCALL_DEFINE_MAXARGS
];
594 *(struct pt_regs
**)¶m
= regs
;
595 param
.syscall_nr
= rec
->nr
;
596 for (i
= 0; i
< sys_data
->nb_args
; i
++)
597 param
.args
[i
] = rec
->args
[i
];
598 return trace_call_bpf(call
, ¶m
);
601 static void perf_syscall_enter(void *ignore
, struct pt_regs
*regs
, long id
)
603 struct syscall_metadata
*sys_data
;
604 struct syscall_trace_enter
*rec
;
605 struct hlist_head
*head
;
606 unsigned long args
[6];
607 bool valid_prog_array
;
612 syscall_nr
= trace_get_syscall_nr(current
, regs
);
613 if (syscall_nr
< 0 || syscall_nr
>= NR_syscalls
)
615 if (!test_bit(syscall_nr
, enabled_perf_enter_syscalls
))
618 sys_data
= syscall_nr_to_meta(syscall_nr
);
622 head
= this_cpu_ptr(sys_data
->enter_event
->perf_events
);
623 valid_prog_array
= bpf_prog_array_valid(sys_data
->enter_event
);
624 if (!valid_prog_array
&& hlist_empty(head
))
627 /* get the size after alignment with the u32 buffer size field */
628 size
= sizeof(unsigned long) * sys_data
->nb_args
+ sizeof(*rec
);
629 size
= ALIGN(size
+ sizeof(u32
), sizeof(u64
));
632 rec
= perf_trace_buf_alloc(size
, NULL
, &rctx
);
636 rec
->nr
= syscall_nr
;
637 syscall_get_arguments(current
, regs
, args
);
638 memcpy(&rec
->args
, args
, sizeof(unsigned long) * sys_data
->nb_args
);
640 if ((valid_prog_array
&&
641 !perf_call_bpf_enter(sys_data
->enter_event
, regs
, sys_data
, rec
)) ||
643 perf_swevent_put_recursion_context(rctx
);
647 perf_trace_buf_submit(rec
, size
, rctx
,
648 sys_data
->enter_event
->event
.type
, 1, regs
,
652 static int perf_sysenter_enable(struct trace_event_call
*call
)
657 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
659 mutex_lock(&syscall_trace_lock
);
660 if (!sys_perf_refcount_enter
)
661 ret
= register_trace_sys_enter(perf_syscall_enter
, NULL
);
663 pr_info("event trace: Could not activate syscall entry trace point");
665 set_bit(num
, enabled_perf_enter_syscalls
);
666 sys_perf_refcount_enter
++;
668 mutex_unlock(&syscall_trace_lock
);
672 static void perf_sysenter_disable(struct trace_event_call
*call
)
676 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
678 mutex_lock(&syscall_trace_lock
);
679 sys_perf_refcount_enter
--;
680 clear_bit(num
, enabled_perf_enter_syscalls
);
681 if (!sys_perf_refcount_enter
)
682 unregister_trace_sys_enter(perf_syscall_enter
, NULL
);
683 mutex_unlock(&syscall_trace_lock
);
686 static int perf_call_bpf_exit(struct trace_event_call
*call
, struct pt_regs
*regs
,
687 struct syscall_trace_exit
*rec
)
689 struct syscall_tp_t
{
690 unsigned long long regs
;
691 unsigned long syscall_nr
;
695 *(struct pt_regs
**)¶m
= regs
;
696 param
.syscall_nr
= rec
->nr
;
697 param
.ret
= rec
->ret
;
698 return trace_call_bpf(call
, ¶m
);
701 static void perf_syscall_exit(void *ignore
, struct pt_regs
*regs
, long ret
)
703 struct syscall_metadata
*sys_data
;
704 struct syscall_trace_exit
*rec
;
705 struct hlist_head
*head
;
706 bool valid_prog_array
;
711 syscall_nr
= trace_get_syscall_nr(current
, regs
);
712 if (syscall_nr
< 0 || syscall_nr
>= NR_syscalls
)
714 if (!test_bit(syscall_nr
, enabled_perf_exit_syscalls
))
717 sys_data
= syscall_nr_to_meta(syscall_nr
);
721 head
= this_cpu_ptr(sys_data
->exit_event
->perf_events
);
722 valid_prog_array
= bpf_prog_array_valid(sys_data
->exit_event
);
723 if (!valid_prog_array
&& hlist_empty(head
))
726 /* We can probably do that at build time */
727 size
= ALIGN(sizeof(*rec
) + sizeof(u32
), sizeof(u64
));
730 rec
= perf_trace_buf_alloc(size
, NULL
, &rctx
);
734 rec
->nr
= syscall_nr
;
735 rec
->ret
= syscall_get_return_value(current
, regs
);
737 if ((valid_prog_array
&&
738 !perf_call_bpf_exit(sys_data
->exit_event
, regs
, rec
)) ||
740 perf_swevent_put_recursion_context(rctx
);
744 perf_trace_buf_submit(rec
, size
, rctx
, sys_data
->exit_event
->event
.type
,
745 1, regs
, head
, NULL
);
748 static int perf_sysexit_enable(struct trace_event_call
*call
)
753 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
755 mutex_lock(&syscall_trace_lock
);
756 if (!sys_perf_refcount_exit
)
757 ret
= register_trace_sys_exit(perf_syscall_exit
, NULL
);
759 pr_info("event trace: Could not activate syscall exit trace point");
761 set_bit(num
, enabled_perf_exit_syscalls
);
762 sys_perf_refcount_exit
++;
764 mutex_unlock(&syscall_trace_lock
);
768 static void perf_sysexit_disable(struct trace_event_call
*call
)
772 num
= ((struct syscall_metadata
*)call
->data
)->syscall_nr
;
774 mutex_lock(&syscall_trace_lock
);
775 sys_perf_refcount_exit
--;
776 clear_bit(num
, enabled_perf_exit_syscalls
);
777 if (!sys_perf_refcount_exit
)
778 unregister_trace_sys_exit(perf_syscall_exit
, NULL
);
779 mutex_unlock(&syscall_trace_lock
);
782 #endif /* CONFIG_PERF_EVENTS */
784 static int syscall_enter_register(struct trace_event_call
*event
,
785 enum trace_reg type
, void *data
)
787 struct trace_event_file
*file
= data
;
790 case TRACE_REG_REGISTER
:
791 return reg_event_syscall_enter(file
, event
);
792 case TRACE_REG_UNREGISTER
:
793 unreg_event_syscall_enter(file
, event
);
796 #ifdef CONFIG_PERF_EVENTS
797 case TRACE_REG_PERF_REGISTER
:
798 return perf_sysenter_enable(event
);
799 case TRACE_REG_PERF_UNREGISTER
:
800 perf_sysenter_disable(event
);
802 case TRACE_REG_PERF_OPEN
:
803 case TRACE_REG_PERF_CLOSE
:
804 case TRACE_REG_PERF_ADD
:
805 case TRACE_REG_PERF_DEL
:
812 static int syscall_exit_register(struct trace_event_call
*event
,
813 enum trace_reg type
, void *data
)
815 struct trace_event_file
*file
= data
;
818 case TRACE_REG_REGISTER
:
819 return reg_event_syscall_exit(file
, event
);
820 case TRACE_REG_UNREGISTER
:
821 unreg_event_syscall_exit(file
, event
);
824 #ifdef CONFIG_PERF_EVENTS
825 case TRACE_REG_PERF_REGISTER
:
826 return perf_sysexit_enable(event
);
827 case TRACE_REG_PERF_UNREGISTER
:
828 perf_sysexit_disable(event
);
830 case TRACE_REG_PERF_OPEN
:
831 case TRACE_REG_PERF_CLOSE
:
832 case TRACE_REG_PERF_ADD
:
833 case TRACE_REG_PERF_DEL
: