68 lines
2.4 KiB
ArmAsm
68 lines
2.4 KiB
ArmAsm
/*
|
|
* Copyright (c) 1993 Winning Strategies, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* 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 Winning Strategies, Inc.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software withough specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 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.
|
|
*
|
|
* $Id: memcmp.s,v 1.3 1993/08/16 17:06:33 jtc Exp $
|
|
*/
|
|
|
|
#if defined(LIBC_RCS) && !defined(lint)
|
|
.asciz "$Id: memcmp.s,v 1.3 1993/08/16 17:06:33 jtc Exp $"
|
|
#endif /* LIBC_RCS and not lint */
|
|
|
|
#include "DEFS.h"
|
|
|
|
/*
|
|
* memcmp (void *b1, void *b2, size_t len)
|
|
*
|
|
* Written by:
|
|
* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
|
|
*/
|
|
|
|
/*
|
|
* XXX should compare by words
|
|
*/
|
|
|
|
ENTRY(memcmp)
|
|
pushl %edi
|
|
pushl %esi
|
|
movl 12(%esp),%edi
|
|
movl 16(%esp),%esi
|
|
movl 20(%esp),%ecx
|
|
xorl %eax,%eax /* clear return value */
|
|
cld /* set compare direction forward */
|
|
repe /* compare! */
|
|
cmpsb
|
|
je L1 /* matches! */
|
|
movsbl -1(%edi),%eax /* unsigned comparison */
|
|
movsbl -1(%esi),%edx
|
|
subl %edx,%eax
|
|
L1: popl %esi
|
|
popl %edi
|
|
ret
|
|
|