tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2015, He Kuang <hekuang@huawei.com>
3 * Copyright (C) 2015, Huawei Inc.
4 */
5#ifndef __BPF_PROLOGUE_H
6#define __BPF_PROLOGUE_H
7
8#include <linux/compiler.h>
9#include <linux/filter.h>
10#include "probe-event.h"
11
12#define BPF_PROLOGUE_MAX_ARGS 3
13#define BPF_PROLOGUE_START_ARG_REG BPF_REG_3
14#define BPF_PROLOGUE_FETCH_RESULT_REG BPF_REG_2
15
16#ifdef HAVE_BPF_PROLOGUE
17int bpf__gen_prologue(struct probe_trace_arg *args, int nargs,
18 struct bpf_insn *new_prog, size_t *new_cnt,
19 size_t cnt_space);
20#else
21#include <errno.h>
22
23static inline int
24bpf__gen_prologue(struct probe_trace_arg *args __maybe_unused,
25 int nargs __maybe_unused,
26 struct bpf_insn *new_prog __maybe_unused,
27 size_t *new_cnt,
28 size_t cnt_space __maybe_unused)
29{
30 if (!new_cnt)
31 return -EINVAL;
32 *new_cnt = 0;
33 return -ENOTSUP;
34}
35#endif
36#endif /* __BPF_PROLOGUE_H */