| He Kuang | bfc077b | 2015-11-16 12:10:12 +0000 | [diff] [blame] | 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 |
| 17 | int 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 | static inline int |
| 22 | bpf__gen_prologue(struct probe_trace_arg *args __maybe_unused, |
| 23 | int nargs __maybe_unused, |
| 24 | struct bpf_insn *new_prog __maybe_unused, |
| 25 | size_t *new_cnt, |
| 26 | size_t cnt_space __maybe_unused) |
| 27 | { |
| 28 | if (!new_cnt) |
| 29 | return -EINVAL; |
| 30 | *new_cnt = 0; |
| 31 | return -ENOTSUP; |
| 32 | } |
| 33 | #endif |
| 34 | #endif /* __BPF_PROLOGUE_H */ |