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 12 bool tp_called = false; 13 bool raw_tp_called = false; 14 bool tp_btf_called = false; 15 bool kprobe_called = false; 16 bool fentry_called = false; 17 18 SEC("tp/syscalls/sys_enter_nanosleep") 19 int handle__tp(struct trace_event_raw_sys_enter *args) 20 { 21 struct __kernel_timespec *ts; 22 23 if (args->id != __NR_nanosleep) 24 return 0; 25 26 ts = (void *)args->args[0]; 27 if (BPF_CORE_READ(ts, tv_nsec) != MY_TV_NSEC) 28 return 0; 29 30 tp_called = true; 31 return 0; 32 } 33 34 SEC("raw_tp/sys_enter") 35 int BPF_PROG(handle__raw_tp, struct pt_regs *regs, long id) 36 { 37 struct __kernel_timespec *ts; 38 39 if (id != __NR_nanosleep) 40 return 0; 41 42 ts = (void *)PT_REGS_PARM1_CORE(regs); 43 if (BPF_CORE_READ(ts, tv_nsec) != MY_TV_NSEC) 44 return 0; 45 46 raw_tp_called = true; 47 return 0; 48 } 49 50 SEC("tp_btf/sys_enter") 51 int BPF_PROG(handle__tp_btf, struct pt_regs *regs, long id) 52 { 53 struct __kernel_timespec *ts; 54 55 if (id != __NR_nanosleep) 56 return 0; 57 58 ts = (void *)PT_REGS_PARM1_CORE(regs); 59 if (BPF_CORE_READ(ts, tv_nsec) != MY_TV_NSEC) 60 return 0; 61 62 tp_btf_called = true; 63 return 0; 64 } 65 66 SEC("kprobe/hrtimer_start_range_ns") 67 int BPF_KPROBE(handle__kprobe, struct hrtimer *timer, ktime_t tim, u64 delta_ns, 68 const enum hrtimer_mode mode) 69 { 70 if (tim == MY_TV_NSEC) 71 kprobe_called = true; 72 return 0; 73 } 74 75 SEC("fentry/hrtimer_start_range_ns") 76 int BPF_PROG(handle__fentry, struct hrtimer *timer, ktime_t tim, u64 delta_ns, 77 const enum hrtimer_mode mode) 78 { 79 if (tim == MY_TV_NSEC) 80 fentry_called = true; 81 return 0; 82 } 83 84 char _license[] SEC("license") = "GPL"; 85