projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| ff6e181a A |
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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 1c79356b | 12 | * |
| ff6e181a A |
13 | * The Original Code and all software distributed under the License are |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| ff6e181a A |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 1c79356b A |
20 | * |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | /* | |
| 24 | * @OSF_COPYRIGHT@ | |
| 25 | */ | |
| 26 | /* | |
| 27 | * Mach Operating System | |
| 28 | * Copyright (c) 1991,1990 Carnegie Mellon University | |
| 29 | * All Rights Reserved. | |
| 30 | * | |
| 31 | * Permission to use, copy, modify and distribute this software and its | |
| 32 | * documentation is hereby granted, provided that both the copyright | |
| 33 | * notice and this permission notice appear in all copies of the | |
| 34 | * software, derivative works or modified versions, and any portions | |
| 35 | * thereof, and that both notices appear in supporting documentation. | |
| 36 | * | |
| 37 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
| 38 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
| 39 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
| 40 | * | |
| 41 | * Carnegie Mellon requests users of this software to return to | |
| 42 | * | |
| 43 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
| 44 | * School of Computer Science | |
| 45 | * Carnegie Mellon University | |
| 46 | * Pittsburgh PA 15213-3890 | |
| 47 | * | |
| 48 | * any improvements or extensions that they make and grant Carnegie Mellon | |
| 49 | * the rights to redistribute these changes. | |
| 50 | */ | |
| 51 | /* | |
| 52 | */ | |
| 53 | ||
| 54 | #include <i386/asm.h> | |
| 55 | ||
| 56 | /* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */ | |
| 57 | ||
| 58 | ENTRY(memcpy) | |
| 59 | pushl %edi | |
| 60 | pushl %esi | |
| 61 | movl 8+ 4(%esp),%edi /* to */ | |
| 62 | movl %edi,%eax /* returns its first argument */ | |
| 63 | movl 8+ 8(%esp),%esi /* from */ | |
| 64 | memcpy_common: | |
| 65 | movl 8+ 12(%esp),%edx /* number of bytes */ | |
| 66 | cld | |
| 67 | /* move longs*/ | |
| 68 | movl %edx,%ecx | |
| 69 | sarl $2,%ecx | |
| 70 | rep | |
| 71 | movsl | |
| 72 | /* move bytes*/ | |
| 73 | movl %edx,%ecx | |
| 74 | andl $3,%ecx | |
| 75 | rep | |
| 76 | movsb | |
| 77 | popl %esi | |
| 78 | popl %edi | |
| 79 | ret | |
| 80 | ||
| 81 | /* void bcopy((const char *) from, (char *) to, (unsigned int) count) */ | |
| 82 | ||
| 83 | ENTRY(bcopy_no_overwrite) | |
| 84 | pushl %edi | |
| 85 | pushl %esi | |
| 86 | movl 8+ 8(%esp),%edi /* to */ | |
| 87 | movl 8+ 4(%esp),%esi /* from */ | |
| 88 | jmp memcpy_common | |
| 89 | ||
| 90 | /* bcopy16(from, to, bcount) using word moves */ | |
| 91 | ||
| 92 | ENTRY(bcopy16) | |
| 93 | pushl %edi | |
| 94 | pushl %esi | |
| 95 | movl 8+12(%esp),%edx /* 8 for the two pushes above */ | |
| 96 | movl 8+ 8(%esp),%edi | |
| 97 | movl 8+ 4(%esp),%esi | |
| 98 | /* move words */ | |
| 99 | 0: cld | |
| 100 | movl %edx,%ecx | |
| 101 | sarl $1,%ecx | |
| 102 | rep | |
| 103 | movsw | |
| 104 | /* move bytes */ | |
| 105 | movl %edx,%ecx | |
| 106 | andl $1,%ecx | |
| 107 | rep | |
| 108 | movsb | |
| 109 | popl %esi | |
| 110 | popl %edi | |
| 111 | ret | |
| 112 | ||
| 91447636 A |
113 | |
| 114 | /* | |
| 115 | * Based on NetBSD's bcopy.S from their libc. | |
| 116 | * bcopy(src, dst, cnt) | |
| 117 | * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 | |
| 118 | */ | |
| 119 | ENTRY(bcopy) | |
| 120 | pushl %esi | |
| 121 | pushl %edi | |
| 122 | movl 12(%esp),%esi | |
| 123 | movl 16(%esp),%edi | |
| 124 | movl 20(%esp),%ecx | |
| 125 | ||
| 126 | movl %edi,%edx | |
| 127 | subl %esi,%edx | |
| 128 | cmpl %ecx,%edx /* overlapping && src < dst? */ | |
| 129 | movl %ecx,%edx | |
| 130 | jb 1f | |
| 131 | ||
| 132 | shrl $2,%ecx /* copy by 32-bit words */ | |
| 133 | cld /* nope, copy forwards */ | |
| 134 | rep | |
| 135 | movsl | |
| 136 | movl %edx,%ecx | |
| 137 | andl $3,%ecx /* any bytes left? */ | |
| 138 | rep | |
| 139 | movsb | |
| 140 | popl %edi | |
| 141 | popl %esi | |
| 142 | ret | |
| 143 | ||
| 144 | ||
| 145 | 1: | |
| 146 | addl %ecx,%edi /* copy backwards */ | |
| 147 | addl %ecx,%esi | |
| 148 | decl %edi | |
| 149 | decl %esi | |
| 150 | andl $3,%ecx /* any fractional bytes? */ | |
| 151 | std | |
| 152 | rep | |
| 153 | movsb | |
| 154 | movl %edx,%ecx /* copy remainder by 32-bit words */ | |
| 155 | shrl $2,%ecx | |
| 156 | subl $3,%esi | |
| 157 | subl $3,%edi | |
| 158 | rep | |
| 159 | movsl | |
| 160 | popl %edi | |
| 161 | popl %esi | |
| 162 | cld | |
| 163 | ret |