1/* SPDX-License-Identifier: GPL-2.0 */
2#undef TRACE_SYSTEM
3#define TRACE_SYSTEM signal
4
5#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
6#define _TRACE_SIGNAL_H
7
8#include <linux/signal.h>
9#include <linux/sched.h>
10#include <linux/tracepoint.h>
11
12#define TP_STORE_SIGINFO(__entry, info)				\
13	do {							\
14		if (info == SEND_SIG_NOINFO) {			\
15			__entry->errno	= 0;			\
16			__entry->code	= SI_USER;		\
17		} else if (info == SEND_SIG_PRIV) {		\
18			__entry->errno	= 0;			\
19			__entry->code	= SI_KERNEL;		\
20		} else {					\
21			__entry->errno	= info->si_errno;	\
22			__entry->code	= info->si_code;	\
23		}						\
24	} while (0)
25
26#ifndef TRACE_HEADER_MULTI_READ
27enum {
28	TRACE_SIGNAL_DELIVERED,
29	TRACE_SIGNAL_IGNORED,
30	TRACE_SIGNAL_ALREADY_PENDING,
31	TRACE_SIGNAL_OVERFLOW_FAIL,
32	TRACE_SIGNAL_LOSE_INFO,
33};
34#endif
35
36/**
37 * signal_generate - called when a signal is generated
38 * @sig: signal number
39 * @info: pointer to struct siginfo
40 * @task: pointer to struct task_struct
41 * @group: shared or private
42 * @result: TRACE_SIGNAL_*
43 *
44 * Current process sends a 'sig' signal to 'task' process with
45 * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
46 * 'info' is not a pointer and you can't access its field. Instead,
47 * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
48 * means that si_code is SI_KERNEL.
49 */
50TRACE_EVENT(signal_generate,
51
52	TP_PROTO(int sig, struct kernel_siginfo *info, struct task_struct *task,
53			int group, int result),
54
55	TP_ARGS(sig, info, task, group, result),
56
57	TP_STRUCT__entry(
58		__field(	int,	sig			)
59		__field(	int,	errno			)
60		__field(	int,	code			)
61		__array(	char,	comm,	TASK_COMM_LEN	)
62		__field(	pid_t,	pid			)
63		__field(	int,	group			)
64		__field(	int,	result			)
65	),
66
67	TP_fast_assign(
68		__entry->sig	= sig;
69		TP_STORE_SIGINFO(__entry, info);
70		memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
71		__entry->pid	= task->pid;
72		__entry->group	= group;
73		__entry->result	= result;
74	),
75
76	TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d grp=%d res=%d",
77		  __entry->sig, __entry->errno, __entry->code,
78		  __entry->comm, __entry->pid, __entry->group,
79		  __entry->result)
80);
81
82/**
83 * signal_deliver - called when a signal is delivered
84 * @sig: signal number
85 * @info: pointer to struct siginfo
86 * @ka: pointer to struct k_sigaction
87 *
88 * A 'sig' signal is delivered to current process with 'info' siginfo,
89 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
90 * SIG_DFL.
91 * Note that some signals reported by signal_generate tracepoint can be
92 * lost, ignored or modified (by debugger) before hitting this tracepoint.
93 * This means, this can show which signals are actually delivered, but
94 * matching generated signals and delivered signals may not be correct.
95 */
96TRACE_EVENT(signal_deliver,
97
98	TP_PROTO(int sig, struct kernel_siginfo *info, struct k_sigaction *ka),
99
100	TP_ARGS(sig, info, ka),
101
102	TP_STRUCT__entry(
103		__field(	int,		sig		)
104		__field(	int,		errno		)
105		__field(	int,		code		)
106		__field(	unsigned long,	sa_handler	)
107		__field(	unsigned long,	sa_flags	)
108	),
109
110	TP_fast_assign(
111		__entry->sig	= sig;
112		TP_STORE_SIGINFO(__entry, info);
113		__entry->sa_handler	= (unsigned long)ka->sa.sa_handler;
114		__entry->sa_flags	= ka->sa.sa_flags;
115	),
116
117	TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
118		  __entry->sig, __entry->errno, __entry->code,
119		  __entry->sa_handler, __entry->sa_flags)
120);
121
122#endif /* _TRACE_SIGNAL_H */
123
124/* This part must be outside protection */
125#include <trace/define_trace.h>
126