/* SPDX-License-Identifier: GPL-2.0 */
|
/*
|
* Copyright (C) 2015, He Kuang <hekuang@huawei.com>
|
* Copyright (C) 2015, Huawei Inc.
|
*/
|
#ifndef __BPF_PROLOGUE_H
|
#define __BPF_PROLOGUE_H
|
|
#include <linux/compiler.h>
|
#include <linux/filter.h>
|
#include "probe-event.h"
|
|
#define BPF_PROLOGUE_MAX_ARGS 3
|
#define BPF_PROLOGUE_START_ARG_REG BPF_REG_3
|
#define BPF_PROLOGUE_FETCH_RESULT_REG BPF_REG_2
|
|
#ifdef HAVE_BPF_PROLOGUE
|
int bpf__gen_prologue(struct probe_trace_arg *args, int nargs,
|
struct bpf_insn *new_prog, size_t *new_cnt,
|
size_t cnt_space);
|
#else
|
#include <errno.h>
|
|
static inline int
|
bpf__gen_prologue(struct probe_trace_arg *args __maybe_unused,
|
int nargs __maybe_unused,
|
struct bpf_insn *new_prog __maybe_unused,
|
size_t *new_cnt,
|
size_t cnt_space __maybe_unused)
|
{
|
if (!new_cnt)
|
return -EINVAL;
|
*new_cnt = 0;
|
return -ENOTSUP;
|
}
|
#endif
|
#endif /* __BPF_PROLOGUE_H */
|
