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 9char _license[] SEC("license") = "GPL"; 10 11struct { 12 char in[256]; 13 char out[256]; 14} data = {}; 15 16struct 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 */ 30struct 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 40struct pt_regs; 41 42struct trace_sys_enter { 43 struct pt_regs *regs; 44 long id; 45}; 46 47SEC("tp_btf/sys_enter") 48int test_core_bitfields_direct(void *ctx) 49{ 50 struct core_reloc_bitfields *in = (void *)&data.in; 51 struct core_reloc_bitfields_output *out = (void *)&data.out; 52 53 out->ub1 = BPF_CORE_READ_BITFIELD(in, ub1); 54 out->ub2 = BPF_CORE_READ_BITFIELD(in, ub2); 55 out->ub7 = BPF_CORE_READ_BITFIELD(in, ub7); 56 out->sb4 = BPF_CORE_READ_BITFIELD(in, sb4); 57 out->sb20 = BPF_CORE_READ_BITFIELD(in, sb20); 58 out->u32 = BPF_CORE_READ_BITFIELD(in, u32); 59 out->s32 = BPF_CORE_READ_BITFIELD(in, s32); 60 61 return 0; 62} 63 64