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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/lib/io-readsl.S
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/*

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

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 *

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 *  Copyright (C) 1995-2000 Russell King

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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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_readsl)

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

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		moveq	pc, 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:		ldr	r3, [r0, #0]

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		ldr	r4, [r0, #0]

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		ldr	ip, [r0, #0]

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		ldr	lr, [r0, #0]

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		subs	r2, r2, #4

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		stmia	r1!, {r3, r4, ip, lr}

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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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		ldrcs	r3, [r0, #0]

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		ldrcs	ip, [r0, #0]

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		stmcsia	r1!, {r3, ip}

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		ldrne	r3, [r0, #0]

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		strne	r3, [r1, #0]

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		mov	pc, lr

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3:		ldr	r3, [r0]

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		cmp	ip, #2

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		mov	ip, r3, get_byte_0

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		strb	ip, [r1], #1

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		bgt	6f

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		mov	ip, r3, get_byte_1

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		strb	ip, [r1], #1

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		beq	5f

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		mov	ip, r3, get_byte_2

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		strb	ip, [r1], #1

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4:		subs	r2, r2, #1

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		mov	ip, r3, pull #24

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		ldrne	r3, [r0]

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		orrne	ip, ip, r3, push #8

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		strne	ip, [r1], #4

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		bne	4b

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		b	8f

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5:		subs	r2, r2, #1

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		mov	ip, r3, pull #16

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		ldrne	r3, [r0]

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		orrne	ip, ip, r3, push #16

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		strne	ip, [r1], #4

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		bne	5b

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		b	7f

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6:		subs	r2, r2, #1

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		mov	ip, r3, pull #8

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		ldrne	r3, [r0]

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		orrne	ip, ip, r3, push #24

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		strne	ip, [r1], #4

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		bne	6b

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		mov	r3, ip, get_byte_2

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		strb	r3, [r1, #2]

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7:		mov	r3, ip, get_byte_1

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		strb	r3, [r1, #1]

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8:		mov	r3, ip, get_byte_0

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		strb	r3, [r1, #0]

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		mov	pc, lr

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ENDPROC(__raw_readsl)

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