/* * Copyright (c) 2000 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@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* */ #include <i386/asm.h> /* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */ ENTRY(memcpy) pushl %edi pushl %esi movl 8+ 4(%esp),%edi /* to */ movl %edi,%eax /* returns its first argument */ movl 8+ 8(%esp),%esi /* from */ memcpy_common: movl 8+ 12(%esp),%edx /* number of bytes */ cld /* move longs*/ movl %edx,%ecx shrl $2,%ecx rep movsl /* move bytes*/ movl %edx,%ecx andl $3,%ecx rep movsb popl %esi popl %edi ret /* void bcopy((const char *) from, (char *) to, (unsigned int) count) */ ENTRY(bcopy_no_overwrite) pushl %edi pushl %esi movl 8+ 8(%esp),%edi /* to */ movl 8+ 4(%esp),%esi /* from */ jmp memcpy_common /* bcopy16(from, to, bcount) using word moves */ ENTRY(bcopy16) pushl %edi pushl %esi movl 8+12(%esp),%edx /* 8 for the two pushes above */ movl 8+ 8(%esp),%edi movl 8+ 4(%esp),%esi /* move words */ 0: cld movl %edx,%ecx shrl $1,%ecx rep movsw /* move bytes */ movl %edx,%ecx andl $1,%ecx rep movsb popl %esi popl %edi ret /* * Based on NetBSD's bcopy.S from their libc. * bcopy(src, dst, cnt) * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 */ ENTRY(bcopy) pushl %esi pushl %edi movl 12(%esp),%esi movl 16(%esp),%edi movl 20(%esp),%ecx movl %edi,%edx subl %esi,%edx cmpl %ecx,%edx /* overlapping && src < dst? */ movl %ecx,%edx jb 1f shrl $2,%ecx /* copy by 32-bit words */ cld /* nope, copy forwards */ rep movsl movl %edx,%ecx andl $3,%ecx /* any bytes left? */ rep movsb popl %edi popl %esi ret 1: addl %ecx,%edi /* copy backwards */ addl %ecx,%esi decl %edi decl %esi andl $3,%ecx /* any fractional bytes? */ std rep movsb movl %edx,%ecx /* copy remainder by 32-bit words */ shrl $2,%ecx subl $3,%esi subl $3,%edi rep movsl popl %edi popl %esi cld ret