1
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>
8#include <linux/ftrace.h>
9#include <linux/perf_event.h>
10#include <asm/syscall.h>
11
12#include "trace_output.h"
13#include "trace.h"
14
15static DEFINE_MUTEX(syscall_trace_lock);
16
17static int syscall_enter_register(struct trace_event_call *event,
18 enum trace_reg type, void *data);
19static int syscall_exit_register(struct trace_event_call *event,
20 enum trace_reg type, void *data);
21
22static struct list_head *
23syscall_get_enter_fields(struct trace_event_call *call)
24{
25 struct syscall_metadata *entry = call->data;
26
27 return &entry->enter_fields;
28}
29
30extern struct syscall_metadata *__start_syscalls_metadata[];
31extern struct syscall_metadata *__stop_syscalls_metadata[];
32
33static struct syscall_metadata **syscalls_metadata;
34
35#ifndef ARCH_HAS_SYSCALL_MATCH_SYM_NAME
36static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
37{
38
39
40
41
42
43
44 return !strcmp(sym + 3, name + 3);
45}
46#endif
47
48#ifdef ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64static int
65trace_get_syscall_nr(struct task_struct *task, struct pt_regs *regs)
66{
67 if (unlikely(arch_trace_is_compat_syscall(regs)))
68 return -1;
69
70 return syscall_get_nr(task, regs);
71}
72#else
73static inline int
74trace_get_syscall_nr(struct task_struct *task, struct pt_regs *regs)
75{
76 return syscall_get_nr(task, regs);
77}
78#endif
79
80static __init struct syscall_metadata *
81find_syscall_meta(unsigned long syscall)
82{
83 struct syscall_metadata **start;
84 struct syscall_metadata **stop;
85 char str[KSYM_SYMBOL_LEN];
86
87
88 start = __start_syscalls_metadata;
89 stop = __stop_syscalls_metadata;
90 kallsyms_lookup(syscall, NULL, NULL, NULL, str);
91
92 if (arch_syscall_match_sym_name(str, "sys_ni_syscall"))
93 return NULL;
94
95 for ( ; start < stop; start++) {
96 if ((*start)->name && arch_syscall_match_sym_name(str, (*start)->name))
97 return *start;
98 }
99 return NULL;
100}
101
102static struct syscall_metadata *syscall_nr_to_meta(int nr)
103{
104 if (!syscalls_metadata || nr >= NR_syscalls || nr < 0)
105 return NULL;
106
107 return syscalls_metadata[nr];
108}
109
110const char *get_syscall_name(int syscall)
111{
112 struct syscall_metadata *entry;
113
114 entry = syscall_nr_to_meta(syscall);
115 if (!entry)
116 return NULL;
117
118 return entry->name;
119}
120
121static enum print_line_t
122print_syscall_enter(struct trace_iterator *iter, int flags,
123 struct trace_event *event)
124{
125 struct trace_array *tr = iter->tr;
126 struct trace_seq *s = &iter->seq;
127 struct trace_entry *ent = iter->ent;
128 struct syscall_trace_enter *trace;
129 struct syscall_metadata *entry;
130 int i, syscall;
131
132 trace = (typeof(trace))ent;
133 syscall = trace->nr;
134 entry = syscall_nr_to_meta(syscall);
135
136 if (!entry)
137 goto end;
138
139 if (entry->enter_event->event.type != ent->type) {
140 WARN_ON_ONCE(1);
141 goto end;
142 }
143
144 trace_seq_printf(s, "%s(", entry->name);
145
146 for (i = 0; i < entry->nb_args; i++) {
147
148 if (trace_seq_has_overflowed(s))
149 goto end;
150
151
152 if (tr->trace_flags & TRACE_ITER_VERBOSE)
153 trace_seq_printf(s, "%s ", entry->types[i]);
154
155
156 trace_seq_printf(s, "%s: %lx%s", entry->args[i],
157 trace->args[i],
158 i == entry->nb_args - 1 ? "" : ", ");
159 }
160
161 trace_seq_putc(s, ')');
162end:
163 trace_seq_putc(s, '\n');
164
165 return trace_handle_return(s);
166}
167
168static enum print_line_t
169print_syscall_exit(struct trace_iterator *iter, int flags,
170 struct trace_event *event)
171{
172 struct trace_seq *s = &iter->seq;
173 struct trace_entry *ent = iter->ent;
174 struct syscall_trace_exit *trace;
175 int syscall;
176 struct syscall_metadata *entry;
177
178 trace = (typeof(trace))ent;
179 syscall = trace->nr;
180 entry = syscall_nr_to_meta(syscall);
181
182 if (!entry) {
183 trace_seq_putc(s, '\n');
184 goto out;
185 }
186
187 if (entry->exit_event->event.type != ent->type) {
188 WARN_ON_ONCE(1);
189 return TRACE_TYPE_UNHANDLED;
190 }
191
192 trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
193 trace->ret);
194
195 out:
196 return trace_handle_return(s);
197}
198
199extern char *__bad_type_size(void);
200
201#define SYSCALL_FIELD(type, field, name) \
202 sizeof(type) != sizeof(trace.field) ? \
203 __bad_type_size() : \
204 #type, #name, offsetof(typeof(trace), field), \
205 sizeof(trace.field), is_signed_type(type)
206
207static int __init
208__set_enter_print_fmt(struct syscall_metadata *entry, char *buf, int len)
209{
210 int i;
211 int pos = 0;
212
213
214#define LEN_OR_ZERO (len ? len - pos : 0)
215
216 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
217 for (i = 0; i < entry->nb_args; i++) {
218 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s: 0x%%0%zulx%s",
219 entry->args[i], sizeof(unsigned long),
220 i == entry->nb_args - 1 ? "" : ", ");
221 }
222 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
223
224 for (i = 0; i < entry->nb_args; i++) {
225 pos += snprintf(buf + pos, LEN_OR_ZERO,
226 ", ((unsigned long)(REC->%s))", entry->args[i]);
227 }
228
229#undef LEN_OR_ZERO
230
231
232 return pos;
233}
234
235static int __init set_syscall_print_fmt(struct trace_event_call *call)
236{
237 char *print_fmt;
238 int len;
239 struct syscall_metadata *entry = call->data;
240
241 if (entry->enter_event != call) {
242 call->print_fmt = "\"0x%lx\", REC->ret";
243 return 0;
244 }
245
246
247 len = __set_enter_print_fmt(entry, NULL, 0);
248
249 print_fmt = kmalloc(len + 1, GFP_KERNEL);
250 if (!print_fmt)
251 return -ENOMEM;
252
253
254 __set_enter_print_fmt(entry, print_fmt, len + 1);
255 call->print_fmt = print_fmt;
256
257 return 0;
258}
259
260static void __init free_syscall_print_fmt(struct trace_event_call *call)
261{
262 struct syscall_metadata *entry = call->data;
263
264 if (entry->enter_event == call)
265 kfree(call->print_fmt);
266}
267
268static int __init syscall_enter_define_fields(struct trace_event_call *call)
269{
270 struct syscall_trace_enter trace;
271 struct syscall_metadata *meta = call->data;
272 int ret;
273 int i;
274 int offset = offsetof(typeof(trace), args);
275
276 ret = trace_define_field(call, SYSCALL_FIELD(int, nr, __syscall_nr),
277 FILTER_OTHER);
278 if (ret)
279 return ret;
280
281 for (i = 0; i < meta->nb_args; i++) {
282 ret = trace_define_field(call, meta->types[i],
283 meta->args[i], offset,
284 sizeof(unsigned long), 0,
285 FILTER_OTHER);
286 offset += sizeof(unsigned long);
287 }
288
289 return ret;
290}
291
292static int __init syscall_exit_define_fields(struct trace_event_call *call)
293{
294 struct syscall_trace_exit trace;
295 int ret;
296
297 ret = trace_define_field(call, SYSCALL_FIELD(int, nr, __syscall_nr),
298 FILTER_OTHER);
299 if (ret)
300 return ret;
301
302 ret = trace_define_field(call, SYSCALL_FIELD(long, ret, ret),
303 FILTER_OTHER);
304
305 return ret;
306}
307
308static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
309{
310 struct trace_array *tr = data;
311 struct trace_event_file *trace_file;
312 struct syscall_trace_enter *entry;
313 struct syscall_metadata *sys_data;
314 struct ring_buffer_event *event;
315 struct ring_buffer *buffer;
316 unsigned long irq_flags;
317 int pc;
318 int syscall_nr;
319 int size;
320
321 syscall_nr = trace_get_syscall_nr(current, regs);
322 if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
323 return;
324
325
326 trace_file = rcu_dereference_sched(tr->enter_syscall_files[syscall_nr]);
327 if (!trace_file)
328 return;
329
330 if (trace_trigger_soft_disabled(trace_file))
331 return;
332
333 sys_data = syscall_nr_to_meta(syscall_nr);
334 if (!sys_data)
335 return;
336
337 size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
338
339 local_save_flags(irq_flags);
340 pc = preempt_count();
341
342 buffer = tr->trace_buffer.buffer;
343 event = trace_buffer_lock_reserve(buffer,
344 sys_data->enter_event->event.type, size, irq_flags, pc);
345 if (!event)
346 return;
347
348 entry = ring_buffer_event_data(event);
349 entry->nr = syscall_nr;
350 syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
351
352 event_trigger_unlock_commit(trace_file, buffer, event, entry,
353 irq_flags, pc);
354}
355
356static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
357{
358 struct trace_array *tr = data;
359 struct trace_event_file *trace_file;
360 struct syscall_trace_exit *entry;
361 struct syscall_metadata *sys_data;
362 struct ring_buffer_event *event;
363 struct ring_buffer *buffer;
364 unsigned long irq_flags;
365 int pc;
366 int syscall_nr;
367
368 syscall_nr = trace_get_syscall_nr(current, regs);
369 if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
370 return;
371
372
373 trace_file = rcu_dereference_sched(tr->exit_syscall_files[syscall_nr]);
374 if (!trace_file)
375 return;
376
377 if (trace_trigger_soft_disabled(trace_file))
378 return;
379
380 sys_data = syscall_nr_to_meta(syscall_nr);
381 if (!sys_data)
382 return;
383
384 local_save_flags(irq_flags);
385 pc = preempt_count();
386
387 buffer = tr->trace_buffer.buffer;
388 event = trace_buffer_lock_reserve(buffer,
389 sys_data->exit_event->event.type, sizeof(*entry),
390 irq_flags, pc);
391 if (!event)
392 return;
393
394 entry = ring_buffer_event_data(event);
395 entry->nr = syscall_nr;
396 entry->ret = syscall_get_return_value(current, regs);
397
398 event_trigger_unlock_commit(trace_file, buffer, event, entry,
399 irq_flags, pc);
400}
401
402static int reg_event_syscall_enter(struct trace_event_file *file,
403 struct trace_event_call *call)
404{
405 struct trace_array *tr = file->tr;
406 int ret = 0;
407 int num;
408
409 num = ((struct syscall_metadata *)call->data)->syscall_nr;
410 if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
411 return -ENOSYS;
412 mutex_lock(&syscall_trace_lock);
413 if (!tr->sys_refcount_enter)
414 ret = register_trace_sys_enter(ftrace_syscall_enter, tr);
415 if (!ret) {
416 rcu_assign_pointer(tr->enter_syscall_files[num], file);
417 tr->sys_refcount_enter++;
418 }
419 mutex_unlock(&syscall_trace_lock);
420 return ret;
421}
422
423static void unreg_event_syscall_enter(struct trace_event_file *file,
424 struct trace_event_call *call)
425{
426 struct trace_array *tr = file->tr;
427 int num;
428
429 num = ((struct syscall_metadata *)call->data)->syscall_nr;
430 if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
431 return;
432 mutex_lock(&syscall_trace_lock);
433 tr->sys_refcount_enter--;
434 RCU_INIT_POINTER(tr->enter_syscall_files[num], NULL);
435 if (!tr->sys_refcount_enter)
436 unregister_trace_sys_enter(ftrace_syscall_enter, tr);
437 mutex_unlock(&syscall_trace_lock);
438}
439
440static int reg_event_syscall_exit(struct trace_event_file *file,
441 struct trace_event_call *call)
442{
443 struct trace_array *tr = file->tr;
444 int ret = 0;
445 int num;
446
447 num = ((struct syscall_metadata *)call->data)->syscall_nr;
448 if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
449 return -ENOSYS;
450 mutex_lock(&syscall_trace_lock);
451 if (!tr->sys_refcount_exit)
452 ret = register_trace_sys_exit(ftrace_syscall_exit, tr);
453 if (!ret) {
454 rcu_assign_pointer(tr->exit_syscall_files[num], file);
455 tr->sys_refcount_exit++;
456 }
457 mutex_unlock(&syscall_trace_lock);
458 return ret;
459}
460
461static void unreg_event_syscall_exit(struct trace_event_file *file,
462 struct trace_event_call *call)
463{
464 struct trace_array *tr = file->tr;
465 int num;
466
467 num = ((struct syscall_metadata *)call->data)->syscall_nr;
468 if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
469 return;
470 mutex_lock(&syscall_trace_lock);
471 tr->sys_refcount_exit--;
472 RCU_INIT_POINTER(tr->exit_syscall_files[num], NULL);
473 if (!tr->sys_refcount_exit)
474 unregister_trace_sys_exit(ftrace_syscall_exit, tr);
475 mutex_unlock(&syscall_trace_lock);
476}
477
478static int __init init_syscall_trace(struct trace_event_call *call)
479{
480 int id;
481 int num;
482
483 num = ((struct syscall_metadata *)call->data)->syscall_nr;
484 if (num < 0 || num >= NR_syscalls) {
485 pr_debug("syscall %s metadata not mapped, disabling ftrace event\n",
486 ((struct syscall_metadata *)call->data)->name);
487 return -ENOSYS;
488 }
489
490 if (set_syscall_print_fmt(call) < 0)
491 return -ENOMEM;
492
493 id = trace_event_raw_init(call);
494
495 if (id < 0) {
496 free_syscall_print_fmt(call);
497 return id;
498 }
499
500 return id;
501}
502
503struct trace_event_functions enter_syscall_print_funcs = {
504 .trace = print_syscall_enter,
505};
506
507struct trace_event_functions exit_syscall_print_funcs = {
508 .trace = print_syscall_exit,
509};
510
511struct trace_event_class __refdata event_class_syscall_enter = {
512 .system = "syscalls",
513 .reg = syscall_enter_register,
514 .define_fields = syscall_enter_define_fields,
515 .get_fields = syscall_get_enter_fields,
516 .raw_init = init_syscall_trace,
517};
518
519struct trace_event_class __refdata event_class_syscall_exit = {
520 .system = "syscalls",
521 .reg = syscall_exit_register,
522 .define_fields = syscall_exit_define_fields,
523 .fields = LIST_HEAD_INIT(event_class_syscall_exit.fields),
524 .raw_init = init_syscall_trace,
525};
526
527unsigned long __init __weak arch_syscall_addr(int nr)
528{
529 return (unsigned long)sys_call_table[nr];
530}
531
532void __init init_ftrace_syscalls(void)
533{
534 struct syscall_metadata *meta;
535 unsigned long addr;
536 int i;
537
538 syscalls_metadata = kcalloc(NR_syscalls, sizeof(*syscalls_metadata),
539 GFP_KERNEL);
540 if (!syscalls_metadata) {
541 WARN_ON(1);
542 return;
543 }
544
545 for (i = 0; i < NR_syscalls; i++) {
546 addr = arch_syscall_addr(i);
547 meta = find_syscall_meta(addr);
548 if (!meta)
549 continue;
550
551 meta->syscall_nr = i;
552 syscalls_metadata[i] = meta;
553 }
554}
555
556#ifdef CONFIG_PERF_EVENTS
557
558static DECLARE_BITMAP(enabled_perf_enter_syscalls, NR_syscalls);
559static DECLARE_BITMAP(enabled_perf_exit_syscalls, NR_syscalls);
560static int sys_perf_refcount_enter;
561static int sys_perf_refcount_exit;
562
563static int perf_call_bpf_enter(struct bpf_prog *prog, struct pt_regs *regs,
564 struct syscall_metadata *sys_data,
565 struct syscall_trace_enter *rec) {
566 struct syscall_tp_t {
567 unsigned long long regs;
568 unsigned long syscall_nr;
569 unsigned long args[SYSCALL_DEFINE_MAXARGS];
570 } param;
571 int i;
572
573 *(struct pt_regs **)¶m = regs;
574 param.syscall_nr = rec->nr;
575 for (i = 0; i < sys_data->nb_args; i++)
576 param.args[i] = rec->args[i];
577 return trace_call_bpf(prog, ¶m);
578}
579
580static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
581{
582 struct syscall_metadata *sys_data;
583 struct syscall_trace_enter *rec;
584 struct hlist_head *head;
585 struct bpf_prog *prog;
586 int syscall_nr;
587 int rctx;
588 int size;
589
590 syscall_nr = trace_get_syscall_nr(current, regs);
591 if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
592 return;
593 if (!test_bit(syscall_nr, enabled_perf_enter_syscalls))
594 return;
595
596 sys_data = syscall_nr_to_meta(syscall_nr);
597 if (!sys_data)
598 return;
599
600 prog = READ_ONCE(sys_data->enter_event->prog);
601 head = this_cpu_ptr(sys_data->enter_event->perf_events);
602 if (!prog && hlist_empty(head))
603 return;
604
605
606 size = sizeof(unsigned long) * sys_data->nb_args + sizeof(*rec);
607 size = ALIGN(size + sizeof(u32), sizeof(u64));
608 size -= sizeof(u32);
609
610 rec = perf_trace_buf_alloc(size, NULL, &rctx);
611 if (!rec)
612 return;
613
614 rec->nr = syscall_nr;
615 syscall_get_arguments(current, regs, 0, sys_data->nb_args,
616 (unsigned long *)&rec->args);
617
618 if ((prog && !perf_call_bpf_enter(prog, regs, sys_data, rec)) ||
619 hlist_empty(head)) {
620 perf_swevent_put_recursion_context(rctx);
621 return;
622 }
623
624 perf_trace_buf_submit(rec, size, rctx,
625 sys_data->enter_event->event.type, 1, regs,
626 head, NULL, NULL);
627}
628
629static int perf_sysenter_enable(struct trace_event_call *call)
630{
631 int ret = 0;
632 int num;
633
634 num = ((struct syscall_metadata *)call->data)->syscall_nr;
635
636 mutex_lock(&syscall_trace_lock);
637 if (!sys_perf_refcount_enter)
638 ret = register_trace_sys_enter(perf_syscall_enter, NULL);
639 if (ret) {
640 pr_info("event trace: Could not activate syscall entry trace point");
641 } else {
642 set_bit(num, enabled_perf_enter_syscalls);
643 sys_perf_refcount_enter++;
644 }
645 mutex_unlock(&syscall_trace_lock);
646 return ret;
647}
648
649static void perf_sysenter_disable(struct trace_event_call *call)
650{
651 int num;
652
653 num = ((struct syscall_metadata *)call->data)->syscall_nr;
654
655 mutex_lock(&syscall_trace_lock);
656 sys_perf_refcount_enter--;
657 clear_bit(num, enabled_perf_enter_syscalls);
658 if (!sys_perf_refcount_enter)
659 unregister_trace_sys_enter(perf_syscall_enter, NULL);
660 mutex_unlock(&syscall_trace_lock);
661}
662
663static int perf_call_bpf_exit(struct bpf_prog *prog, struct pt_regs *regs,
664 struct syscall_trace_exit *rec) {
665 struct syscall_tp_t {
666 unsigned long long regs;
667 unsigned long syscall_nr;
668 unsigned long ret;
669 } param;
670
671 *(struct pt_regs **)¶m = regs;
672 param.syscall_nr = rec->nr;
673 param.ret = rec->ret;
674 return trace_call_bpf(prog, ¶m);
675}
676
677static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
678{
679 struct syscall_metadata *sys_data;
680 struct syscall_trace_exit *rec;
681 struct hlist_head *head;
682 struct bpf_prog *prog;
683 int syscall_nr;
684 int rctx;
685 int size;
686
687 syscall_nr = trace_get_syscall_nr(current, regs);
688 if (syscall_nr < 0 || syscall_nr >= NR_syscalls)
689 return;
690 if (!test_bit(syscall_nr, enabled_perf_exit_syscalls))
691 return;
692
693 sys_data = syscall_nr_to_meta(syscall_nr);
694 if (!sys_data)
695 return;
696
697 prog = READ_ONCE(sys_data->exit_event->prog);
698 head = this_cpu_ptr(sys_data->exit_event->perf_events);
699 if (!prog && hlist_empty(head))
700 return;
701
702
703 size = ALIGN(sizeof(*rec) + sizeof(u32), sizeof(u64));
704 size -= sizeof(u32);
705
706 rec = perf_trace_buf_alloc(size, NULL, &rctx);
707 if (!rec)
708 return;
709
710 rec->nr = syscall_nr;
711 rec->ret = syscall_get_return_value(current, regs);
712
713 if ((prog && !perf_call_bpf_exit(prog, regs, rec)) ||
714 hlist_empty(head)) {
715 perf_swevent_put_recursion_context(rctx);
716 return;
717 }
718
719 perf_trace_buf_submit(rec, size, rctx, sys_data->exit_event->event.type,
720 1, regs, head, NULL, NULL);
721}
722
723static int perf_sysexit_enable(struct trace_event_call *call)
724{
725 int ret = 0;
726 int num;
727
728 num = ((struct syscall_metadata *)call->data)->syscall_nr;
729
730 mutex_lock(&syscall_trace_lock);
731 if (!sys_perf_refcount_exit)
732 ret = register_trace_sys_exit(perf_syscall_exit, NULL);
733 if (ret) {
734 pr_info("event trace: Could not activate syscall exit trace point");
735 } else {
736 set_bit(num, enabled_perf_exit_syscalls);
737 sys_perf_refcount_exit++;
738 }
739 mutex_unlock(&syscall_trace_lock);
740 return ret;
741}
742
743static void perf_sysexit_disable(struct trace_event_call *call)
744{
745 int num;
746
747 num = ((struct syscall_metadata *)call->data)->syscall_nr;
748
749 mutex_lock(&syscall_trace_lock);
750 sys_perf_refcount_exit--;
751 clear_bit(num, enabled_perf_exit_syscalls);
752 if (!sys_perf_refcount_exit)
753 unregister_trace_sys_exit(perf_syscall_exit, NULL);
754 mutex_unlock(&syscall_trace_lock);
755}
756
757#endif
758
759static int syscall_enter_register(struct trace_event_call *event,
760 enum trace_reg type, void *data)
761{
762 struct trace_event_file *file = data;
763
764 switch (type) {
765 case TRACE_REG_REGISTER:
766 return reg_event_syscall_enter(file, event);
767 case TRACE_REG_UNREGISTER:
768 unreg_event_syscall_enter(file, event);
769 return 0;
770
771#ifdef CONFIG_PERF_EVENTS
772 case TRACE_REG_PERF_REGISTER:
773 return perf_sysenter_enable(event);
774 case TRACE_REG_PERF_UNREGISTER:
775 perf_sysenter_disable(event);
776 return 0;
777 case TRACE_REG_PERF_OPEN:
778 case TRACE_REG_PERF_CLOSE:
779 case TRACE_REG_PERF_ADD:
780 case TRACE_REG_PERF_DEL:
781 return 0;
782#endif
783 }
784 return 0;
785}
786
787static int syscall_exit_register(struct trace_event_call *event,
788 enum trace_reg type, void *data)
789{
790 struct trace_event_file *file = data;
791
792 switch (type) {
793 case TRACE_REG_REGISTER:
794 return reg_event_syscall_exit(file, event);
795 case TRACE_REG_UNREGISTER:
796 unreg_event_syscall_exit(file, event);
797 return 0;
798
799#ifdef CONFIG_PERF_EVENTS
800 case TRACE_REG_PERF_REGISTER:
801 return perf_sysexit_enable(event);
802 case TRACE_REG_PERF_UNREGISTER:
803 perf_sysexit_disable(event);
804 return 0;
805 case TRACE_REG_PERF_OPEN:
806 case TRACE_REG_PERF_CLOSE:
807 case TRACE_REG_PERF_ADD:
808 case TRACE_REG_PERF_DEL:
809 return 0;
810#endif
811 }
812 return 0;
813}
814
