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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Just like strncpy() except that if a fault occurs during copying,
- * -EFAULT is returned.
- *
- * Inputs:
- * in0: address of destination buffer
- * in1: address of string to be copied
- * in2: length of buffer in bytes
- * Outputs:
- * r8: -EFAULT in case of fault or number of bytes copied if no fault
- *
- * Copyright (C) 1998-2001 Hewlett-Packard Co
- * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
- *
- * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by
- * by Andreas Schwab <schwab@suse.de>).
- */
- #include <asm/asmmacro.h>
- #include <asm/export.h>
- GLOBAL_ENTRY(__strncpy_from_user)
- alloc r2=ar.pfs,3,0,0,0
- mov r8=0
- mov r9=in1
- ;;
- add r10=in1,in2
- cmp.eq p6,p0=r0,in2
- (p6) br.ret.spnt.many rp
- // XXX braindead copy loop---this needs to be optimized
- .Loop1:
- EX(.Lexit, ld1 r8=[in1],1)
- ;;
- EX(.Lexit, st1 [in0]=r8,1)
- cmp.ne p6,p7=r8,r0
- ;;
- (p6) cmp.ne.unc p8,p0=in1,r10
- (p8) br.cond.dpnt.few .Loop1
- ;;
- (p6) mov r8=in2 // buffer filled up---return buffer length
- (p7) sub r8=in1,r9,1 // return string length (excluding NUL character)
- [.Lexit:]
- br.ret.sptk.many rp
- END(__strncpy_from_user)
- EXPORT_SYMBOL(__strncpy_from_user)
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