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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include <stdint.h>
#include "bpf_helpers.h"
#include "bpf_core_read.h"
char _license[] SEC("license") = "GPL";
static volatile struct data {
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;
};
#define TRANSFER_BITFIELD(in, out, field) \
if (BPF_CORE_READ_BITFIELD_PROBED(in, field, &res)) \
return 1; \
out->field = res
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;
TRANSFER_BITFIELD(in, out, ub1);
TRANSFER_BITFIELD(in, out, ub2);
TRANSFER_BITFIELD(in, out, ub7);
TRANSFER_BITFIELD(in, out, sb4);
TRANSFER_BITFIELD(in, out, sb20);
TRANSFER_BITFIELD(in, out, u32);
TRANSFER_BITFIELD(in, out, s32);
return 0;
}
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