// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */

#include "vmlinux.h"
#include <asm/unistd.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>

#define MY_TV_NSEC 1337

bool tp_called = false;
bool raw_tp_called = false;
bool tp_btf_called = false;
bool kprobe_called = false;
bool fentry_called = false;

SEC("tp/syscalls/sys_enter_nanosleep")
int handle__tp(struct syscall_trace_enter *args)
{
        struct __kernel_timespec *ts;
        long tv_nsec;

        if (args->nr != __NR_nanosleep)
                return 0;

        ts = (void *)args->args[0];
        if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
            tv_nsec != MY_TV_NSEC)
                return 0;

        tp_called = true;
        return 0;
}

SEC("raw_tp/sys_enter")
int BPF_PROG(handle__raw_tp, struct pt_regs *regs, long id)
{
        struct __kernel_timespec *ts;
        long tv_nsec;

        if (id != __NR_nanosleep)
                return 0;

        ts = (void *)PT_REGS_PARM1_CORE_SYSCALL(regs);
        if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
            tv_nsec != MY_TV_NSEC)
                return 0;

        raw_tp_called = true;
        return 0;
}

SEC("tp_btf/sys_enter")
int BPF_PROG(handle__tp_btf, struct pt_regs *regs, long id)
{
        struct __kernel_timespec *ts;
        long tv_nsec;

        if (id != __NR_nanosleep)
                return 0;

        ts = (void *)PT_REGS_PARM1_CORE_SYSCALL(regs);
        if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
            tv_nsec != MY_TV_NSEC)
                return 0;

        tp_btf_called = true;
        return 0;
}

SEC("kprobe/hrtimer_start_range_ns")
int BPF_KPROBE(handle__kprobe, struct hrtimer *timer, ktime_t tim, u64 delta_ns,
               const enum hrtimer_mode mode)
{
        if (tim == MY_TV_NSEC)
                kprobe_called = true;
        return 0;
}

SEC("fentry/hrtimer_start_range_ns")
int BPF_PROG(handle__fentry, struct hrtimer *timer, ktime_t tim, u64 delta_ns,
             const enum hrtimer_mode mode)
{
        if (tim == MY_TV_NSEC)
                fentry_called = true;
        return 0;
}

char _license[] SEC("license") = "GPL";