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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/lib/io-writesl.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 *  linux/arch/arm/lib/io-writesl.S

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 *

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 *  Copyright (C) 1995-2000 Russell King

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 */

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#include <linux/linkage.h>

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#include <asm/assembler.h>

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ENTRY(__raw_writesl)

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		teq	r2, #0		@ do we have to check for the zero len?

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		reteq	lr

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		ands	ip, r1, #3

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		bne	3f

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		subs	r2, r2, #4

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		bmi	2f

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		stmfd	sp!, {r4, lr}

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1:		ldmia	r1!, {r3, r4, ip, lr}

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		subs	r2, r2, #4

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		str	r3, [r0, #0]

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		str	r4, [r0, #0]

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		str	ip, [r0, #0]

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		str	lr, [r0, #0]

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		bpl	1b

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		ldmfd	sp!, {r4, lr}

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2:		movs	r2, r2, lsl #31

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		ldmiacs	r1!, {r3, ip}

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		strcs	r3, [r0, #0]

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		ldrne	r3, [r1, #0]

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		strcs	ip, [r0, #0]

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		strne	r3, [r0, #0]

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		ret	lr

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3:		bic	r1, r1, #3

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		ldr	r3, [r1], #4

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		cmp	ip, #2

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		blt	5f

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		bgt	6f

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4:		mov	ip, r3, lspull #16

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		ldr	r3, [r1], #4

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		subs	r2, r2, #1

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		orr	ip, ip, r3, lspush #16

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		str	ip, [r0]

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		bne	4b

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		ret	lr

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5:		mov	ip, r3, lspull #8

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		ldr	r3, [r1], #4

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		subs	r2, r2, #1

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		orr	ip, ip, r3, lspush #24

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		str	ip, [r0]

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		bne	5b

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		ret	lr

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6:		mov	ip, r3, lspull #24

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		ldr	r3, [r1], #4

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		subs	r2, r2, #1

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		orr	ip, ip, r3, lspush #8

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		str	ip, [r0]

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		bne	6b

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		ret	lr

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ENDPROC(__raw_writesl)

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