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