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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_direct.c
Extension
.c
Size
1286 bytes
Lines
64
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
};

struct pt_regs;

struct trace_sys_enter {
	struct pt_regs *regs;
	long id;
};

SEC("tp_btf/sys_enter")
int test_core_bitfields_direct(void *ctx)
{
	struct core_reloc_bitfields *in = (void *)&data.in;
	struct core_reloc_bitfields_output *out = (void *)&data.out;

	out->ub1 = BPF_CORE_READ_BITFIELD(in, ub1);
	out->ub2 = BPF_CORE_READ_BITFIELD(in, ub2);
	out->ub7 = BPF_CORE_READ_BITFIELD(in, ub7);
	out->sb4 = BPF_CORE_READ_BITFIELD(in, sb4);
	out->sb20 = BPF_CORE_READ_BITFIELD(in, sb20);
	out->u32 = BPF_CORE_READ_BITFIELD(in, u32);
	out->s32 = BPF_CORE_READ_BITFIELD(in, s32);

	return 0;
}

Annotation

Implementation Notes