1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
88 lines
2.6 KiB
ArmAsm
88 lines
2.6 KiB
ArmAsm
/*
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* Copyright (c) 1993 Winning Strategies, Inc.
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* All rights reserved.
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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 by Winning Strategies, Inc.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#if defined(LIBC_RCS) && !defined(lint)
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.text
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.asciz "$FreeBSD$"
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#endif /* LIBC_RCS and not lint */
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#include "DEFS.h"
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/*
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* bzero (void *b, size_t len)
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* write len zero bytes to the string b.
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*
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* Written by:
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* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
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*/
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ENTRY(bzero)
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pushl %edi
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pushl %ebx
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movl 12(%esp),%edi
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movl 16(%esp),%ecx
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cld /* set fill direction forward */
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xorl %eax,%eax /* set fill data to 0 */
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/*
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* if the string is too short, it's really not worth the overhead
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* of aligning to word boundries, etc. So we jump to a plain
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* unaligned set.
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*/
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cmpl $0x0f,%ecx
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jle L1
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movl %edi,%edx /* compute misalignment */
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negl %edx
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andl $3,%edx
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movl %ecx,%ebx
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subl %edx,%ebx
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movl %edx,%ecx /* zero until word aligned */
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rep
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stosb
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movl %ebx,%ecx /* zero by words */
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shrl $2,%ecx
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rep
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stosl
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movl %ebx,%ecx
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andl $3,%ecx /* zero remainder by bytes */
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L1: rep
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stosb
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popl %ebx
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popl %edi
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ret
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