summaryrefslogtreecommitdiff
path: root/include/trace/syscall.h
blob: 51b72d8a84987e7ad84a7e18e639dc9bdb0e84c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
#ifndef _TRACE_SYSCALL_H
#define _TRACE_SYSCALL_H

#include <linux/tracepoint.h>
#include <linux/unistd.h>
#include <linux/ftrace_event.h>
#include <linux/thread_info.h>

#include <asm/ptrace.h>


/*
 * A syscall entry in the ftrace syscalls array.
 *
 * @name: name of the syscall
 * @syscall_nr: number of the syscall
 * @nb_args: number of parameters it takes
 * @types: list of types as strings
 * @args: list of args as strings (args[i] matches types[i])
 * @enter_event: associated syscall_enter trace event
 * @exit_event: associated syscall_exit trace event
 */
struct syscall_metadata {
	const char	*name;
	int		syscall_nr;
	int		nb_args;
	const char	**types;
	const char	**args;
	struct list_head enter_fields;

	struct ftrace_event_call *enter_event;
	struct ftrace_event_call *exit_event;
};

#ifdef CONFIG_FTRACE_SYSCALLS
extern unsigned long arch_syscall_addr(int nr);
extern int init_syscall_trace(struct ftrace_event_call *call);

extern int reg_event_syscall_enter(struct ftrace_event_call *call);
extern void unreg_event_syscall_enter(struct ftrace_event_call *call);
extern int reg_event_syscall_exit(struct ftrace_event_call *call);
extern void unreg_event_syscall_exit(struct ftrace_event_call *call);
extern int
ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags,
				      struct trace_event *event);
enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags,
				     struct trace_event *event);
#endif

#ifdef CONFIG_PERF_EVENTS
int perf_sysenter_enable(struct ftrace_event_call *call);
void perf_sysenter_disable(struct ftrace_event_call *call);
int perf_sysexit_enable(struct ftrace_event_call *call);
void perf_sysexit_disable(struct ftrace_event_call *call);
#endif

#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
static inline void syscall_tracepoint_update(struct task_struct *p)
{
	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
		set_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
	else
		clear_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
}
#else
static inline void syscall_tracepoint_update(struct task_struct *p)
{
}
#endif

#endif /* _TRACE_SYSCALL_H */