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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
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.
11: *
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
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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.
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 [email protected]
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)
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:
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