68 lines
2.6 KiB
ArmAsm
68 lines
2.6 KiB
ArmAsm
/* $NetBSD: strncpy.S,v 1.1 2002/10/17 11:53:33 scw Exp $ */
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/*
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* Copyright 2002 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Steve C. Woodford for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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/*
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* char *strncpy(char *dst, const char *src, size_t n)
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*
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* Note:
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* We assume that this routine is mostly called for short strings, and that
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* the overhead of aligning dst/src to permit long or quad copies is just
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* Not Worth The Effort.
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*/
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ENTRY(strncpy)
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#ifndef _LP64
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add.l r2, r63, r2
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add.l r3, r63, r3
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addz.l r4, r63, r4
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#endif
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ptabs/u r18, tr0
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beq/u r4, r63, tr0
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pta/l 1f, tr1
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pta/u 2f, tr2
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movi 0, r5
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1: ldx.b r3, r5, r0 /* r0 = *src */
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stx.b r2, r5, r0 /* *dst = r0 */
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addi r5, 1, r5 /* src++, dst++ */
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beq/u r5, r4, tr0 /* Bail if copied `n' bytes */
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bne/l r0, r63, tr1 /* Loop until r0 == '\0' */
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2: stx.b r2, r5, r63 /* Pad with '\0' */
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addi r5, 1, r5
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bne/l r5, r4, tr2
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blink tr0, r63
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