acbd06206b
Add vmlinux.h generation to selftest/bpf's Makefile. Use it from newly added test_vmlinux to trace nanosleep syscall using 5 different types of programs: - tracepoint; - raw tracepoint; - raw tracepoint w/ direct memory reads (tp_btf); - kprobe; - fentry. These programs are realistic variants of real-life tracing programs, excercising vmlinux.h's usage with tracing applications. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20200313172336.1879637-5-andriin@fb.com
85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include "vmlinux.h"
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#include <asm/unistd.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_core_read.h>
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#define MY_TV_NSEC 1337
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bool tp_called = false;
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bool raw_tp_called = false;
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bool tp_btf_called = false;
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bool kprobe_called = false;
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bool fentry_called = false;
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SEC("tp/syscalls/sys_enter_nanosleep")
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int handle__tp(struct trace_event_raw_sys_enter *args)
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{
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struct __kernel_timespec *ts;
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if (args->id != __NR_nanosleep)
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return 0;
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ts = (void *)args->args[0];
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if (BPF_CORE_READ(ts, tv_nsec) != MY_TV_NSEC)
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return 0;
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tp_called = true;
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return 0;
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}
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SEC("raw_tp/sys_enter")
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int BPF_PROG(handle__raw_tp, struct pt_regs *regs, long id)
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{
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struct __kernel_timespec *ts;
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if (id != __NR_nanosleep)
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return 0;
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ts = (void *)PT_REGS_PARM1_CORE(regs);
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if (BPF_CORE_READ(ts, tv_nsec) != MY_TV_NSEC)
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return 0;
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raw_tp_called = true;
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return 0;
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}
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SEC("tp_btf/sys_enter")
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int BPF_PROG(handle__tp_btf, struct pt_regs *regs, long id)
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{
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struct __kernel_timespec *ts;
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if (id != __NR_nanosleep)
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return 0;
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ts = (void *)PT_REGS_PARM1_CORE(regs);
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if (BPF_CORE_READ(ts, tv_nsec) != MY_TV_NSEC)
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return 0;
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tp_btf_called = true;
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return 0;
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}
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SEC("kprobe/hrtimer_nanosleep")
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int BPF_KPROBE(handle__kprobe,
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ktime_t rqtp, enum hrtimer_mode mode, clockid_t clockid)
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{
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if (rqtp == MY_TV_NSEC)
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kprobe_called = true;
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return 0;
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}
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SEC("fentry/hrtimer_nanosleep")
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int BPF_PROG(handle__fentry,
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ktime_t rqtp, enum hrtimer_mode mode, clockid_t clockid)
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{
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if (rqtp == MY_TV_NSEC)
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fentry_called = true;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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