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