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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/verifier_load_acquire.c
Extension
.c
Size
6269 bytes
Lines
235
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

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2025 Google LLC. */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "../../../include/linux/filter.h"
#include "bpf_misc.h"

#ifdef CAN_USE_LOAD_ACQ_STORE_REL

SEC("socket")
__description("load-acquire, 8-bit")
__success __success_unpriv __retval(0)
__naked void load_acquire_8(void)
{
	asm volatile (
	"r0 = 0;"
	"w1 = 0xfe;"
	"*(u8 *)(r10 - 1) = w1;"
	".8byte %[load_acquire_insn];" // w2 = load_acquire((u8 *)(r10 - 1));
	"if r2 == r1 goto 1f;"
	"r0 = 1;"
"1:"
	"exit;"
	:
	: __imm_insn(load_acquire_insn,
		     BPF_ATOMIC_OP(BPF_B, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -1))
	: __clobber_all);
}

SEC("socket")
__description("load-acquire, 16-bit")
__success __success_unpriv __retval(0)
__naked void load_acquire_16(void)
{
	asm volatile (
	"r0 = 0;"
	"w1 = 0xfedc;"
	"*(u16 *)(r10 - 2) = w1;"
	".8byte %[load_acquire_insn];" // w2 = load_acquire((u16 *)(r10 - 2));
	"if r2 == r1 goto 1f;"
	"r0 = 1;"
"1:"
	"exit;"
	:
	: __imm_insn(load_acquire_insn,
		     BPF_ATOMIC_OP(BPF_H, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -2))
	: __clobber_all);
}

SEC("socket")
__description("load-acquire, 32-bit")
__success __success_unpriv __retval(0)
__naked void load_acquire_32(void)
{
	asm volatile (
	"r0 = 0;"
	"w1 = 0xfedcba09;"
	"*(u32 *)(r10 - 4) = w1;"
	".8byte %[load_acquire_insn];" // w2 = load_acquire((u32 *)(r10 - 4));
	"if r2 == r1 goto 1f;"
	"r0 = 1;"
"1:"
	"exit;"
	:
	: __imm_insn(load_acquire_insn,
		     BPF_ATOMIC_OP(BPF_W, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -4))
	: __clobber_all);
}

SEC("socket")
__description("load-acquire, 64-bit")
__success __success_unpriv __retval(0)
__naked void load_acquire_64(void)
{
	asm volatile (
	"r0 = 0;"
	"r1 = 0xfedcba0987654321 ll;"
	"*(u64 *)(r10 - 8) = r1;"
	".8byte %[load_acquire_insn];" // r2 = load_acquire((u64 *)(r10 - 8));
	"if r2 == r1 goto 1f;"
	"r0 = 1;"
"1:"
	"exit;"
	:
	: __imm_insn(load_acquire_insn,
		     BPF_ATOMIC_OP(BPF_DW, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -8))
	: __clobber_all);
}

Annotation

Implementation Notes