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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sh/lib64/strcpy.S
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/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */

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/* Modified by SuperH, Inc. September 2003 */

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! Entry: arg0: destination

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!        arg1: source

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! Exit:  result: destination

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!

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! SH5 code Copyright 2002 SuperH Ltd.

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#if __BYTE_ORDER == __LITTLE_ENDIAN

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#define SHHI shlld

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#define SHLO shlrd

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#else

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#define SHHI shlrd

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#define SHLO shlld

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#endif

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	.section .text..SHmedia32,"ax"

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	.globl	strcpy

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	.type	strcpy, @function

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	.align 5

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strcpy:

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	pta/l shortstring,tr1

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	ldlo.q r3,0,r4

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	ptabs r18,tr4

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	shlli r3,3,r7

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	addi r2, 8, r0

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	mcmpeq.b r4,r63,r6

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	SHHI r6,r7,r6

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	bnei/u r6,0,tr1 // shortstring

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	pta/l no_lddst, tr2

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	ori r3,-8,r23

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	sub r2, r23, r0

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	sub r3, r2, r21

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	addi r21, 8, r20

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	ldx.q r0, r21, r5

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	pta/l loop, tr0

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	ori r2,-8,r22

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	mcmpeq.b r5, r63, r6

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	bgt/u r22, r23, tr2 // no_lddst

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	// r22 < r23 :  Need to do a load from the destination.

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	// r22 == r23 : Doesn't actually need to load from destination,

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	//              but still can be handled here.

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	ldlo.q r2, 0, r9

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	movi -1, r8

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	SHLO r8, r7, r8

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	mcmv r4, r8, r9

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	stlo.q r2, 0, r9

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	beqi/l r6, 0, tr0 // loop

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	add r5, r63, r4

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	addi r0, 8, r0

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	blink tr1, r63 // shortstring

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no_lddst:

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	// r22 > r23: note that for r22 == r23 the sthi.q would clobber

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	//            bytes before the destination region.

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	stlo.q r2, 0, r4

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	SHHI r4, r7, r4

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	sthi.q r0, -1, r4

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	beqi/l r6, 0, tr0 // loop

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	add r5, r63, r4

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	addi r0, 8, r0

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shortstring:

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#if __BYTE_ORDER != __LITTLE_ENDIAN

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	pta/l shortstring2,tr1

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	byterev r4,r4

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#endif

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shortstring2:

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	st.b r0,-8,r4

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	andi r4,0xff,r5

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	shlri r4,8,r4

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	addi r0,1,r0

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	bnei/l r5,0,tr1

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	blink tr4,r63 // return

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	.balign 8

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loop:

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	stlo.q r0, 0, r5

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	ldx.q r0, r20, r4

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	addi r0, 16, r0

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	sthi.q r0, -9, r5

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	mcmpeq.b r4, r63, r6

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	bnei/u r6, 0, tr1 // shortstring

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	ldx.q r0, r21, r5

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	stlo.q r0, -8, r4

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	sthi.q r0, -1, r4

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	mcmpeq.b r5, r63, r6

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	beqi/l r6, 0, tr0 // loop

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	add r5, r63, r4

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	addi r0, 8, r0

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	blink tr1, r63 // shortstring

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	.size	strcpy,.-strcpy

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