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