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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/kernel/kuser32.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * AArch32 user helpers.

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 * Based on the kuser helpers in arch/arm/kernel/entry-armv.S.

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 *

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 * Copyright (C) 2005-2011 Nicolas Pitre <[email protected]>

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 * Copyright (C) 2012-2018 ARM Ltd.

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 *

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 * The kuser helpers below are mapped at a fixed address by

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 * aarch32_setup_additional_pages() and are provided for compatibility

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 * reasons with 32 bit (aarch32) applications that need them.

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 *

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 * See Documentation/arch/arm/kernel_user_helpers.rst for formal definitions.

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 */

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#include <asm/unistd.h>

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	.section .rodata

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	.align	5

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	.globl	__kuser_helper_start

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__kuser_helper_start:

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__kuser_cmpxchg64:			// 0xffff0f60

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	.inst	0xe92d00f0		//	push		{r4, r5, r6, r7}

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	.inst	0xe1c040d0		//	ldrd		r4, r5, [r0]

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	.inst	0xe1c160d0		//	ldrd		r6, r7, [r1]

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	.inst	0xe1b20f9f		// 1:	ldrexd		r0, r1, [r2]

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	.inst	0xe0303004		//	eors		r3, r0, r4

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	.inst	0x00313005		//	eoreqs		r3, r1, r5

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	.inst	0x01a23e96		//	stlexdeq	r3, r6, [r2]

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	.inst	0x03330001		//	teqeq		r3, #1

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	.inst	0x0afffff9		//	beq		1b

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	.inst	0xf57ff05b		//	dmb		ish

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	.inst	0xe2730000		//	rsbs		r0, r3, #0

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	.inst	0xe8bd00f0		//	pop		{r4, r5, r6, r7}

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	.inst	0xe12fff1e		//	bx		lr

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	.align	5

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__kuser_memory_barrier:			// 0xffff0fa0

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	.inst	0xf57ff05b		//	dmb		ish

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	.inst	0xe12fff1e		//	bx		lr

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	.align	5

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__kuser_cmpxchg:			// 0xffff0fc0

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	.inst	0xe1923f9f		// 1:	ldrex		r3, [r2]

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	.inst	0xe0533000		//	subs		r3, r3, r0

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	.inst	0x01823e91		//	stlexeq		r3, r1, [r2]

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	.inst	0x03330001		//	teqeq		r3, #1

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	.inst	0x0afffffa		//	beq		1b

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	.inst	0xf57ff05b		//	dmb		ish

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	.inst	0xe2730000		//	rsbs		r0, r3, #0

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	.inst	0xe12fff1e		//	bx		lr

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	.align	5

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__kuser_get_tls:			// 0xffff0fe0

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	.inst	0xee1d0f70		//	mrc		p15, 0, r0, c13, c0, 3

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	.inst	0xe12fff1e		//	bx		lr

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	.rep	5

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	.word	0

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	.endr

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__kuser_helper_version:			// 0xffff0ffc

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	.word	((__kuser_helper_end - __kuser_helper_start) >> 5)

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	.globl	__kuser_helper_end

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__kuser_helper_end:

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