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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/lib/mem_64.S
10817 views
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/*

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 * String handling functions for PowerPC.

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 *

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 * Copyright (C) 1996 Paul Mackerras.

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 *

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

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 * modify it under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version

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 * 2 of the License, or (at your option) any later version.

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 */

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#include <asm/processor.h>

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#include <asm/errno.h>

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#include <asm/ppc_asm.h>

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_GLOBAL(memset)

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	neg	r0,r3

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	rlwimi	r4,r4,8,16,23

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	andi.	r0,r0,7			/* # bytes to be 8-byte aligned */

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	rlwimi	r4,r4,16,0,15

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	cmplw	cr1,r5,r0		/* do we get that far? */

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	rldimi	r4,r4,32,0

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	PPC_MTOCRF	1,r0

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	mr	r6,r3

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	blt	cr1,8f

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	beq+	3f			/* if already 8-byte aligned */

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	subf	r5,r0,r5

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	bf	31,1f

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	stb	r4,0(r6)

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	addi	r6,r6,1

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1:	bf	30,2f

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	sth	r4,0(r6)

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	addi	r6,r6,2

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2:	bf	29,3f

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	stw	r4,0(r6)

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	addi	r6,r6,4

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3:	srdi.	r0,r5,6

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	clrldi	r5,r5,58

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	mtctr	r0

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	beq	5f

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4:	std	r4,0(r6)

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	std	r4,8(r6)

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	std	r4,16(r6)

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	std	r4,24(r6)

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	std	r4,32(r6)

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	std	r4,40(r6)

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	std	r4,48(r6)

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	std	r4,56(r6)

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	addi	r6,r6,64

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	bdnz	4b

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5:	srwi.	r0,r5,3

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	clrlwi	r5,r5,29

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	PPC_MTOCRF	1,r0

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	beq	8f

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	bf	29,6f

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	std	r4,0(r6)

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	std	r4,8(r6)

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	std	r4,16(r6)

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	std	r4,24(r6)

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	addi	r6,r6,32

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6:	bf	30,7f

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	std	r4,0(r6)

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	std	r4,8(r6)

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	addi	r6,r6,16

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7:	bf	31,8f

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	std	r4,0(r6)

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	addi	r6,r6,8

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8:	cmpwi	r5,0

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	PPC_MTOCRF	1,r5

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	beqlr+

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	bf	29,9f

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	stw	r4,0(r6)

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	addi	r6,r6,4

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9:	bf	30,10f

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	sth	r4,0(r6)

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	addi	r6,r6,2

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10:	bflr	31

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	stb	r4,0(r6)

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	blr

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_GLOBAL(memmove)

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	cmplw	0,r3,r4

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	bgt	.backwards_memcpy

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	b	.memcpy

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_GLOBAL(backwards_memcpy)

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	rlwinm.	r7,r5,32-3,3,31		/* r0 = r5 >> 3 */

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	add	r6,r3,r5

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	add	r4,r4,r5

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	beq	2f

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	andi.	r0,r6,3

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	mtctr	r7

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	bne	5f

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1:	lwz	r7,-4(r4)

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	lwzu	r8,-8(r4)

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	stw	r7,-4(r6)

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	stwu	r8,-8(r6)

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	bdnz	1b

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	andi.	r5,r5,7

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2:	cmplwi	0,r5,4

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	blt	3f

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	lwzu	r0,-4(r4)

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	subi	r5,r5,4

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	stwu	r0,-4(r6)

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3:	cmpwi	0,r5,0

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	beqlr

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	mtctr	r5

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4:	lbzu	r0,-1(r4)

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	stbu	r0,-1(r6)

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	bdnz	4b

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	blr

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5:	mtctr	r0

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6:	lbzu	r7,-1(r4)

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	stbu	r7,-1(r6)

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	bdnz	6b

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	subf	r5,r0,r5

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	rlwinm.	r7,r5,32-3,3,31

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	beq	2b

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	mtctr	r7

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	b	1b

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