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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/lib/io-writesw-armv4.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-writesw-armv4.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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		.macro	outword, rd

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#ifndef __ARMEB__

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		strh	\rd, [r0]

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		mov	\rd, \rd, lsr #16

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		strh	\rd, [r0]

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#else

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		mov	lr, \rd, lsr #16

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		strh	lr, [r0]

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		strh	\rd, [r0]

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#endif

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		.endm

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.Loutsw_align:	movs	ip, r1, lsl #31

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		bne	.Loutsw_noalign

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		ldrh	r3, [r1], #2

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		sub	r2, r2, #1

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		strh	r3, [r0]

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ENTRY(__raw_writesw)

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		teq	r2, #0

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		reteq	lr

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		ands	r3, r1, #3

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		bne	.Loutsw_align

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		stmfd	sp!, {r4, r5, lr}

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		subs	r2, r2, #8

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		bmi	.Lno_outsw_8

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.Loutsw_8_lp:	ldmia	r1!, {r3, r4, r5, ip}

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		subs	r2, r2, #8

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		outword	r3

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		outword	r4

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		outword	r5

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		outword	ip

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		bpl	.Loutsw_8_lp

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.Lno_outsw_8:	tst	r2, #4

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		beq	.Lno_outsw_4

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		ldmia	r1!, {r3, ip}

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		outword	r3

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		outword	ip

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.Lno_outsw_4:	movs	r2, r2, lsl #31

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		bcc	.Lno_outsw_2

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		ldr	r3, [r1], #4

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		outword	r3

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.Lno_outsw_2:	ldrhne	r3, [r1]

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		strhne	r3, [r0]

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		ldmfd	sp!, {r4, r5, pc}

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#ifdef __ARMEB__

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#define pull_hbyte0	lsl #8

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#define push_hbyte1	lsr #24

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#else

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#define pull_hbyte0	lsr #24

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#define push_hbyte1	lsl #8

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#endif

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.Loutsw_noalign:

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 ARM(		ldr	r3, [r1, -r3]!	)

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 THUMB(		rsb	r3, r3, #0	)

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 THUMB(		ldr	r3, [r1, r3]	)

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 THUMB(		sub	r1, r3		)

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		subcs	r2, r2, #1

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		bcs	2f

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		subs	r2, r2, #2

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		bmi	3f

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1:		mov	ip, r3, lsr #8

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		strh	ip, [r0]

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2:		mov	ip, r3, pull_hbyte0

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		ldr	r3, [r1, #4]!

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		subs	r2, r2, #2

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		orr	ip, ip, r3, push_hbyte1

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		strh	ip, [r0]

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		bpl	1b

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		tst	r2, #1

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3:		movne	ip, r3, lsr #8

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		strhne	ip, [r0]

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		ret	lr

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ENDPROC(__raw_writesw)

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