| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright (c) 2019 Facebook |
| |
| #include <linux/bpf.h> |
| #include <stdint.h> |
| #include <bpf/bpf_helpers.h> |
| #include <bpf/bpf_core_read.h> |
| |
| char _license[] SEC("license") = "GPL"; |
| |
| struct { |
| char in[256]; |
| char out[256]; |
| } data = {}; |
| |
| struct core_reloc_bitfields { |
| /* unsigned bitfields */ |
| uint8_t ub1: 1; |
| uint8_t ub2: 2; |
| uint32_t ub7: 7; |
| /* signed bitfields */ |
| int8_t sb4: 4; |
| int32_t sb20: 20; |
| /* non-bitfields */ |
| uint32_t u32; |
| int32_t s32; |
| }; |
| |
| /* bitfield read results, all as plain integers */ |
| struct core_reloc_bitfields_output { |
| int64_t ub1; |
| int64_t ub2; |
| int64_t ub7; |
| int64_t sb4; |
| int64_t sb20; |
| int64_t u32; |
| int64_t s32; |
| }; |
| |
| SEC("raw_tracepoint/sys_enter") |
| int test_core_bitfields(void *ctx) |
| { |
| struct core_reloc_bitfields *in = (void *)&data.in; |
| struct core_reloc_bitfields_output *out = (void *)&data.out; |
| uint64_t res; |
| |
| out->ub1 = BPF_CORE_READ_BITFIELD_PROBED(in, ub1); |
| out->ub2 = BPF_CORE_READ_BITFIELD_PROBED(in, ub2); |
| out->ub7 = BPF_CORE_READ_BITFIELD_PROBED(in, ub7); |
| out->sb4 = BPF_CORE_READ_BITFIELD_PROBED(in, sb4); |
| out->sb20 = BPF_CORE_READ_BITFIELD_PROBED(in, sb20); |
| out->u32 = BPF_CORE_READ_BITFIELD_PROBED(in, u32); |
| out->s32 = BPF_CORE_READ_BITFIELD_PROBED(in, s32); |
| |
| return 0; |
| } |
| |