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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Define struct user_exit_info which is shared between BPF and userspace parts
4 * to communicate exit status and other information.
5 *
6 * Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
7 * Copyright (c) 2022 Tejun Heo <tj@kernel.org>
8 * Copyright (c) 2022 David Vernet <dvernet@meta.com>
9 */
10
11#ifndef __USER_EXIT_INFO_BPF_H
12#define __USER_EXIT_INFO_BPF_H
13
14#ifndef LSP
15#include "vmlinux.h"
16#endif
17#include <bpf/bpf_core_read.h>
18
19#include "user_exit_info_common.h"
20
21#define UEI_DEFINE(__name) \
22 char RESIZABLE_ARRAY(data, __name##_dump); \
23 const volatile u32 __name##_dump_len; \
24 struct user_exit_info __name SEC(".data")
25
26#define UEI_RECORD(__uei_name, __ei) ({ \
27 bpf_probe_read_kernel_str(__uei_name.reason, \
28 sizeof(__uei_name.reason), (__ei)->reason); \
29 bpf_probe_read_kernel_str(__uei_name.msg, \
30 sizeof(__uei_name.msg), (__ei)->msg); \
31 bpf_probe_read_kernel_str(__uei_name##_dump, \
32 __uei_name##_dump_len, (__ei)->dump); \
33 if (bpf_core_field_exists((__ei)->exit_code)) \
34 __uei_name.exit_code = (__ei)->exit_code; \
35 /* use __sync to force memory barrier */ \
36 __sync_val_compare_and_swap(&__uei_name.kind, __uei_name.kind, \
37 (__ei)->kind); \
38})
39
40#endif /* __USER_EXIT_INFO_BPF_H */