/*
* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* The contents of this file constitute Original Code as defined in and
* are subject to the Apple Public Source License Version 1.1 (the
* "License"). You may not use this file except in compliance with the
* License. Please obtain a copy of the License at
* http://www.apple.com/publicsource and read it before using this file.
*
* This Original Code and all software distributed under the License are
* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
* License for the specific language governing rights and limitations
* under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from locore.s.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <architecture/i386/asm_help.h>
/*
* (ov)bcopy (src,dst,cnt)
* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
*/
TEXT
#ifdef MEMCOPY
LEAF(_memcpy,0)
#else
#ifdef MEMMOVE
LEAF(_memmove,0)
#else
LEAF(_bcopy,0)
#endif
#endif
pushl %esi
pushl %edi
#if defined(MEMCOPY) || defined(MEMMOVE)
movl 12(%esp),%edi
movl 16(%esp),%esi
#else
movl 12(%esp),%esi
movl 16(%esp),%edi
#endif
movl 20(%esp),%ecx
movl %edi,%eax
subl %esi,%eax
cmpl %ecx,%eax /* overlapping? */
jb 1f
cld /* nope, copy forwards. */
shrl $2,%ecx /* copy by words */
rep
movsl
movl 20(%esp),%ecx
andl $3,%ecx /* any bytes left? */
rep
movsb
#if defined(MEMCOPY) || defined(MEMMOVE)
movl 12(%esp),%eax
#endif
popl %edi
popl %esi
ret
1:
addl %ecx,%edi /* copy backwards. */
addl %ecx,%esi
std
andl $3,%ecx /* any fractional bytes? */
decl %edi
decl %esi
rep
movsb
movl 20(%esp),%ecx /* copy remainder by words */
shrl $2,%ecx
subl $3,%esi
subl $3,%edi
rep
movsl
#if defined(MEMCOPY) || defined(MEMMOVE)
movl 12(%esp),%eax
#endif
popl %edi
popl %esi
cld
END(bcopy)