| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | // Copyright (c) 2019 Facebook |
| 3 | |
| 4 | #include <linux/bpf.h> |
| 5 | #include <stdint.h> |
| 6 | #include <bpf/bpf_helpers.h> |
| 7 | #include <bpf/bpf_core_read.h> |
| 8 | |
| 9 | char _license[] SEC("license") = "GPL"; |
| 10 | |
| 11 | struct { |
| 12 | char in[256]; |
| 13 | char out[256]; |
| 14 | } data = {}; |
| 15 | |
| 16 | struct core_reloc_bitfields { |
| 17 | /* unsigned bitfields */ |
| 18 | uint8_t ub1: 1; |
| 19 | uint8_t ub2: 2; |
| 20 | uint32_t ub7: 7; |
| 21 | /* signed bitfields */ |
| 22 | int8_t sb4: 4; |
| 23 | int32_t sb20: 20; |
| 24 | /* non-bitfields */ |
| 25 | uint32_t u32; |
| 26 | int32_t s32; |
| 27 | }; |
| 28 | |
| 29 | /* bitfield read results, all as plain integers */ |
| 30 | struct core_reloc_bitfields_output { |
| 31 | int64_t ub1; |
| 32 | int64_t ub2; |
| 33 | int64_t ub7; |
| 34 | int64_t sb4; |
| 35 | int64_t sb20; |
| 36 | int64_t u32; |
| 37 | int64_t s32; |
| 38 | }; |
| 39 | |
| 40 | SEC("raw_tracepoint/sys_enter") |
| 41 | int test_core_bitfields(void *ctx) |
| 42 | { |
| 43 | struct core_reloc_bitfields *in = (void *)&data.in; |
| 44 | struct core_reloc_bitfields_output *out = (void *)&data.out; |
| 45 | |
| 46 | out->ub1 = BPF_CORE_READ_BITFIELD_PROBED(in, ub1); |
| 47 | out->ub2 = BPF_CORE_READ_BITFIELD_PROBED(in, ub2); |
| 48 | out->ub7 = BPF_CORE_READ_BITFIELD_PROBED(in, ub7); |
| 49 | out->sb4 = BPF_CORE_READ_BITFIELD_PROBED(in, sb4); |
| 50 | out->sb20 = BPF_CORE_READ_BITFIELD_PROBED(in, sb20); |
| 51 | out->u32 = BPF_CORE_READ_BITFIELD_PROBED(in, u32); |
| 52 | out->s32 = BPF_CORE_READ_BITFIELD_PROBED(in, s32); |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 |