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 */ 41