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 | * | |
| de355530 A |
6 | * The contents of this file constitute Original Code as defined in and |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 1c79356b | 11 | * |
| de355530 A |
12 | * This Original Code and all software distributed under the License are |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| de355530 A |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 1c79356b A |
19 | * |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | /* | |
| 23 | * @OSF_COPYRIGHT@ | |
| 24 | */ | |
| 25 | /* | |
| 26 | * Mach Operating System | |
| 27 | * Copyright (c) 1991,1990 Carnegie Mellon University | |
| 28 | * All Rights Reserved. | |
| 29 | * | |
| 30 | * Permission to use, copy, modify and distribute this software and its | |
| 31 | * documentation is hereby granted, provided that both the copyright | |
| 32 | * notice and this permission notice appear in all copies of the | |
| 33 | * software, derivative works or modified versions, and any portions | |
| 34 | * thereof, and that both notices appear in supporting documentation. | |
| 35 | * | |
| 36 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
| 37 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
| 38 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
| 39 | * | |
| 40 | * Carnegie Mellon requests users of this software to return to | |
| 41 | * | |
| 42 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
| 43 | * School of Computer Science | |
| 44 | * Carnegie Mellon University | |
| 45 | * Pittsburgh PA 15213-3890 | |
| 46 | * | |
| 47 | * any improvements or extensions that they make and grant Carnegie Mellon | |
| 48 | * the rights to redistribute these changes. | |
| 49 | */ | |
| 50 | /* | |
| 51 | */ | |
| 52 | ||
| 53 | #include <i386/asm.h> | |
| 54 | ||
| 55 | /* void *memcpy((void *) to, (const void *) from, (size_t) bcount) */ | |
| 56 | ||
| 57 | ENTRY(memcpy) | |
| 58 | pushl %edi | |
| 59 | pushl %esi | |
| 60 | movl 8+ 4(%esp),%edi /* to */ | |
| 61 | movl %edi,%eax /* returns its first argument */ | |
| 62 | movl 8+ 8(%esp),%esi /* from */ | |
| 63 | memcpy_common: | |
| 64 | movl 8+ 12(%esp),%edx /* number of bytes */ | |
| 65 | cld | |
| 66 | /* move longs*/ | |
| 67 | movl %edx,%ecx | |
| 68 | sarl $2,%ecx | |
| 69 | rep | |
| 70 | movsl | |
| 71 | /* move bytes*/ | |
| 72 | movl %edx,%ecx | |
| 73 | andl $3,%ecx | |
| 74 | rep | |
| 75 | movsb | |
| 76 | popl %esi | |
| 77 | popl %edi | |
| 78 | ret | |
| 79 | ||
| 80 | /* void bcopy((const char *) from, (char *) to, (unsigned int) count) */ | |
| 81 | ||
| 82 | ENTRY(bcopy_no_overwrite) | |
| 83 | pushl %edi | |
| 84 | pushl %esi | |
| 85 | movl 8+ 8(%esp),%edi /* to */ | |
| 86 | movl 8+ 4(%esp),%esi /* from */ | |
| 87 | jmp memcpy_common | |
| 88 | ||
| 89 | /* bcopy16(from, to, bcount) using word moves */ | |
| 90 | ||
| 91 | ENTRY(bcopy16) | |
| 92 | pushl %edi | |
| 93 | pushl %esi | |
| 94 | movl 8+12(%esp),%edx /* 8 for the two pushes above */ | |
| 95 | movl 8+ 8(%esp),%edi | |
| 96 | movl 8+ 4(%esp),%esi | |
| 97 | /* move words */ | |
| 98 | 0: cld | |
| 99 | movl %edx,%ecx | |
| 100 | sarl $1,%ecx | |
| 101 | rep | |
| 102 | movsw | |
| 103 | /* move bytes */ | |
| 104 | movl %edx,%ecx | |
| 105 | andl $1,%ecx | |
| 106 | rep | |
| 107 | movsb | |
| 108 | popl %esi | |
| 109 | popl %edi | |
| 110 | ret | |
| 111 |