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