| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * Copyright (C) 2015, He Kuang <hekuang@huawei.com> |
| 4 | * Copyright (C) 2015, Huawei Inc. |
| 5 | */ |
| 6 | #ifndef __BPF_PROLOGUE_H |
| 7 | #define __BPF_PROLOGUE_H |
| 8 | |
| 9 | #include <linux/compiler.h> |
| 10 | #include <linux/filter.h> |
| 11 | #include "probe-event.h" |
| 12 | |
| 13 | #define BPF_PROLOGUE_MAX_ARGS 3 |
| 14 | #define BPF_PROLOGUE_START_ARG_REG BPF_REG_3 |
| 15 | #define BPF_PROLOGUE_FETCH_RESULT_REG BPF_REG_2 |
| 16 | |
| 17 | #ifdef HAVE_BPF_PROLOGUE |
| 18 | int bpf__gen_prologue(struct probe_trace_arg *args, int nargs, |
| 19 | struct bpf_insn *new_prog, size_t *new_cnt, |
| 20 | size_t cnt_space); |
| 21 | #else |
| 22 | #include <errno.h> |
| 23 | |
| 24 | static inline int |
| 25 | bpf__gen_prologue(struct probe_trace_arg *args __maybe_unused, |
| 26 | int nargs __maybe_unused, |
| 27 | struct bpf_insn *new_prog __maybe_unused, |
| 28 | size_t *new_cnt, |
| 29 | size_t cnt_space __maybe_unused) |
| 30 | { |
| 31 | if (!new_cnt) |
| 32 | return -EINVAL; |
| 33 | *new_cnt = 0; |
| 34 | return -ENOTSUP; |
| 35 | } |
| 36 | #endif |
| 37 | #endif /* __BPF_PROLOGUE_H */ |