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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/ia64/lib/strncpy_from_user.S
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/*

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 * Just like strncpy() except that if a fault occurs during copying,

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 * -EFAULT is returned.

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 *

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 * Inputs:

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 *	in0:	address of destination buffer

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 *	in1:	address of string to be copied

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 *	in2:	length of buffer in bytes

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 * Outputs:

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 *	r8:	-EFAULT in case of fault or number of bytes copied if no fault

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 *

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 * Copyright (C) 1998-2001 Hewlett-Packard Co

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 * Copyright (C) 1998-2001 David Mosberger-Tang <[email protected]>

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 *

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 * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by

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 *			 by Andreas Schwab <[email protected]>).

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 */

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#include <asm/asmmacro.h>

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GLOBAL_ENTRY(__strncpy_from_user)

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	alloc r2=ar.pfs,3,0,0,0

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	mov r8=0

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	mov r9=in1

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	;;

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	add r10=in1,in2

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	cmp.eq p6,p0=r0,in2

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(p6)	br.ret.spnt.many rp

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	// XXX braindead copy loop---this needs to be optimized

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.Loop1:

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	EX(.Lexit, ld1 r8=[in1],1)

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	;;

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	EX(.Lexit, st1 [in0]=r8,1)

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	cmp.ne p6,p7=r8,r0

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	;;

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(p6)	cmp.ne.unc p8,p0=in1,r10

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(p8)	br.cond.dpnt.few .Loop1

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	;;

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(p6)	mov r8=in2		// buffer filled up---return buffer length

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(p7)	sub r8=in1,r9,1		// return string length (excluding NUL character)

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[.Lexit:]

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	br.ret.sptk.many rp

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END(__strncpy_from_user)

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