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") test_core_bitfields(void * ctx)41int 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