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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/lib/string.S
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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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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#include <linux/export.h>

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#include <asm/ppc_asm.h>

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#include <asm/cache.h>

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	.text

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/* This clears out any unused part of the destination buffer,

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   just as the libc version does.  -- paulus */

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_GLOBAL(strncpy)

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	PPC_LCMPI 0,r5,0

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	beqlr

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	mtctr	r5

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	addi	r6,r3,-1

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	addi	r4,r4,-1

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	.balign IFETCH_ALIGN_BYTES

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1:	lbzu	r0,1(r4)

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	cmpwi	0,r0,0

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	stbu	r0,1(r6)

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	bdnzf	2,1b		/* dec ctr, branch if ctr != 0 && !cr0.eq */

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	bnelr			/* if we didn't hit a null char, we're done */

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	mfctr	r5

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	PPC_LCMPI 0,r5,0	/* any space left in destination buffer? */

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	beqlr			/* we know r0 == 0 here */

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2:	stbu	r0,1(r6)	/* clear it out if so */

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	bdnz	2b

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	blr

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EXPORT_SYMBOL(strncpy)

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_GLOBAL(strncmp)

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	PPC_LCMPI 0,r5,0

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	beq-	2f

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	mtctr	r5

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	addi	r5,r3,-1

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	addi	r4,r4,-1

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	.balign IFETCH_ALIGN_BYTES

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1:	lbzu	r3,1(r5)

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	cmpwi	1,r3,0

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	lbzu	r0,1(r4)

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	subf.	r3,r0,r3

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	beqlr	1

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	bdnzt	eq,1b

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	blr

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2:	li	r3,0

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	blr

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EXPORT_SYMBOL(strncmp)

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_GLOBAL(memchr)

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	PPC_LCMPI 0,r5,0

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	beq-	2f

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	mtctr	r5

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	addi	r3,r3,-1

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	.balign IFETCH_ALIGN_BYTES

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1:	lbzu	r0,1(r3)

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	cmpw	0,r0,r4

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	bdnzf	2,1b

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	beqlr

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2:	li	r3,0

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	blr

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EXPORT_SYMBOL(memchr)

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