memmove.S (7e546392b5fe3a496acff53ac7aadd1c57b2a4cf) memmove.S (8009c566df29a567fbd1ec08b901fda938ecc5ef)
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $Id$
36 */
37
38#if defined(LIBC_RCS) && !defined(lint)
39 .text
40 .asciz "$Id$"
41#endif /* LIBC_RCS and not lint */
42
43#include "DEFS.h"
44
45 /*
46 * (ov)bcopy (src,dst,cnt)
47 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
48 */
49
50ALTENTRY(memcpy)
51ENTRY(memmove)
52 pushl %esi
53 pushl %edi
54 movl 12(%esp),%edi
55 movl 16(%esp),%esi
56 movl 20(%esp),%ecx
57 movl %edi,%eax
58 subl %esi,%eax
59 cmpl %ecx,%eax
60 jb 1f
61 cld /* nope, copy forwards. */
62 shrl $2,%ecx /* copy by words */
63 rep
64 movsl
65 movl 20(%esp),%ecx
66 andl $3,%ecx /* any bytes left? */
67 rep
68 movsb
69 movl 12(%esp),%eax
70 popl %edi
71 popl %esi
72 ret
731:
74 addl %ecx,%edi /* copy backwards. */
75 addl %ecx,%esi
76 decl %edi
77 decl %esi
78 andl $3,%ecx /* any fractional bytes? */
79 std
80 rep
81 movsb
82 movl 20(%esp),%ecx /* copy remainder by words */
83 shrl $2,%ecx
84 subl $3,%esi
85 subl $3,%edi
86 rep
87 movsl
88 movl 12(%esp),%eax
89 popl %edi
90 popl %esi
91 cld
92 ret
1#define MEMMOVE
2#include "bcopy.S"