1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3
4#include "vmlinux.h"
5#include <asm/unistd.h>
6#include <bpf/bpf_helpers.h>
7#include <bpf/bpf_tracing.h>
8#include <bpf/bpf_core_read.h>
9
10#define MY_TV_NSEC 1337
11
12bool tp_called = false;
13bool raw_tp_called = false;
14bool tp_btf_called = false;
15bool kprobe_called = false;
16bool fentry_called = false;
17
18SEC("tp/syscalls/sys_enter_nanosleep")
19int handle__tp(struct syscall_trace_enter *args)
20{
21	struct __kernel_timespec *ts;
22	long tv_nsec;
23
24	if (args->nr != __NR_nanosleep)
25		return 0;
26
27	ts = (void *)args->args[0];
28	if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
29	    tv_nsec != MY_TV_NSEC)
30		return 0;
31
32	tp_called = true;
33	return 0;
34}
35
36SEC("raw_tp/sys_enter")
37int BPF_PROG(handle__raw_tp, struct pt_regs *regs, long id)
38{
39	struct __kernel_timespec *ts;
40	long tv_nsec;
41
42	if (id != __NR_nanosleep)
43		return 0;
44
45	ts = (void *)PT_REGS_PARM1_CORE_SYSCALL(regs);
46	if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
47	    tv_nsec != MY_TV_NSEC)
48		return 0;
49
50	raw_tp_called = true;
51	return 0;
52}
53
54SEC("tp_btf/sys_enter")
55int BPF_PROG(handle__tp_btf, struct pt_regs *regs, long id)
56{
57	struct __kernel_timespec *ts;
58	long tv_nsec;
59
60	if (id != __NR_nanosleep)
61		return 0;
62
63	ts = (void *)PT_REGS_PARM1_CORE_SYSCALL(regs);
64	if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
65	    tv_nsec != MY_TV_NSEC)
66		return 0;
67
68	tp_btf_called = true;
69	return 0;
70}
71
72SEC("kprobe/hrtimer_start_range_ns")
73int BPF_KPROBE(handle__kprobe, struct hrtimer *timer, ktime_t tim, u64 delta_ns,
74	       const enum hrtimer_mode mode)
75{
76	if (tim == MY_TV_NSEC)
77		kprobe_called = true;
78	return 0;
79}
80
81SEC("fentry/hrtimer_start_range_ns")
82int BPF_PROG(handle__fentry, struct hrtimer *timer, ktime_t tim, u64 delta_ns,
83	     const enum hrtimer_mode mode)
84{
85	if (tim == MY_TV_NSEC)
86		fentry_called = true;
87	return 0;
88}
89
90char _license[] SEC("license") = "GPL";
91