+++ /dev/null
-/*
- * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-/*
- * 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.
- *
- */
-
-#include <sys/appleapiopts.h>
-#include <machine/cpu_capabilities.h>
-#include <platfunc.h>
-
-/*
- * bzero (void *b, size_t len)
- * write len zero bytes to the string b.
- *
- * Written by:
- * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
- */
-
-PLATFUNC_FUNCTION_START_GENERIC(bzero, scalar, 32, 4)
- pushl %ebp /* set up a frame for backtraces */
- movl %esp,%ebp
- pushl %edi
- pushl %ebx
- movl 8(%ebp),%edi
- movl 12(%ebp),%ecx
-
- cld /* set fill direction forward */
- xorl %eax,%eax /* set fill data to 0 */
-
- /*
- * if the string is too short, it's really not worth the overhead
- * of aligning to word boundries, etc. So we jump to a plain
- * unaligned set.
- */
- cmpl $0x0f,%ecx
- jbe L1
-
- movl %edi,%edx /* compute misalignment */
- negl %edx
- andl $3,%edx
- movl %ecx,%ebx
- subl %edx,%ebx
-
- movl %edx,%ecx /* zero until word aligned */
- rep
- stosb
-
- movl %ebx,%ecx /* zero by words */
- shrl $2,%ecx
- rep
- stosl
-
- movl %ebx,%ecx
- andl $3,%ecx /* zero remainder by bytes */
-L1: rep
- stosb
-
- popl %ebx
- popl %edi
- popl %ebp
- ret
-
-PLATFUNC_DESCRIPTOR(bzero,scalar,0,0)
projects / apple / libc.git / blobdiff