1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * @OSF_COPYRIGHT@ 30 */ 31/* 32 * Mach Operating System 33 * Copyright (c) 1991,1990 Carnegie Mellon University 34 * All Rights Reserved. 35 * 36 * Permission to use, copy, modify and distribute this software and its 37 * documentation is hereby granted, provided that both the copyright 38 * notice and this permission notice appear in all copies of the 39 * software, derivative works or modified versions, and any portions 40 * thereof, and that both notices appear in supporting documentation. 41 * 42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 43 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 45 * 46 * Carnegie Mellon requests users of this software to return to 47 * 48 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 49 * School of Computer Science 50 * Carnegie Mellon University 51 * Pittsburgh PA 15213-3890 52 * 53 * any improvements or extensions that they make and grant Carnegie Mellon 54 * the rights to redistribute these changes. 55 */ 56/* 57 */ 58 59#include <i386/asm.h> 60 61/* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */ 62 63ENTRY(memcpy) 64 pushl %edi 65 pushl %esi 66 movl 8+ 4(%esp),%edi /* to */ 67 movl %edi,%eax /* returns its first argument */ 68 movl 8+ 8(%esp),%esi /* from */ 69memcpy_common: 70 movl 8+ 12(%esp),%edx /* number of bytes */ 71 cld 72/* move longs*/ 73 movl %edx,%ecx 74 shrl $2,%ecx 75 rep 76 movsl 77/* move bytes*/ 78 movl %edx,%ecx 79 andl $3,%ecx 80 rep 81 movsb 82 popl %esi 83 popl %edi 84 ret 85 86/* void bcopy((const char *) from, (char *) to, (unsigned int) count) */ 87 88ENTRY(bcopy_no_overwrite) 89 pushl %edi 90 pushl %esi 91 movl 8+ 8(%esp),%edi /* to */ 92 movl 8+ 4(%esp),%esi /* from */ 93 jmp memcpy_common 94 95/* bcopy16(from, to, bcount) using word moves */ 96 97ENTRY(bcopy16) 98 pushl %edi 99 pushl %esi 100 movl 8+12(%esp),%edx /* 8 for the two pushes above */ 101 movl 8+ 8(%esp),%edi 102 movl 8+ 4(%esp),%esi 103/* move words */ 1040: cld 105 movl %edx,%ecx 106 shrl $1,%ecx 107 rep 108 movsw 109/* move bytes */ 110 movl %edx,%ecx 111 andl $1,%ecx 112 rep 113 movsb 114 popl %esi 115 popl %edi 116 ret 117 118 119 /* 120 * Based on NetBSD's bcopy.S from their libc. 121 * bcopy(src, dst, cnt) 122 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 123 */ 124ENTRY(bcopy) 125 pushl %esi 126 pushl %edi 127 movl 12(%esp),%esi 128 movl 16(%esp),%edi 129 movl 20(%esp),%ecx 130 131 movl %edi,%edx 132 subl %esi,%edx 133 cmpl %ecx,%edx /* overlapping && src < dst? */ 134 movl %ecx,%edx 135 jb 1f 136 137 shrl $2,%ecx /* copy by 32-bit words */ 138 cld /* nope, copy forwards */ 139 rep 140 movsl 141 movl %edx,%ecx 142 andl $3,%ecx /* any bytes left? */ 143 rep 144 movsb 145 popl %edi 146 popl %esi 147 ret 148 149 1501: 151 addl %ecx,%edi /* copy backwards */ 152 addl %ecx,%esi 153 decl %edi 154 decl %esi 155 andl $3,%ecx /* any fractional bytes? */ 156 std 157 rep 158 movsb 159 movl %edx,%ecx /* copy remainder by 32-bit words */ 160 shrl $2,%ecx 161 subl $3,%esi 162 subl $3,%edi 163 rep 164 movsl 165 popl %edi 166 popl %esi 167 cld 168 ret 169