linux/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c
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   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
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