1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from locore.s.
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
| 1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from locore.s.
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
|
33__FBSDID("$FreeBSD: head/lib/libc/amd64/string/bcopy.S 144779 2005-04-08 05:10:18Z alc $");
| 33__FBSDID("$FreeBSD: head/lib/libc/amd64/string/bcopy.S 184547 2008-11-02 01:10:54Z peter $");
|
34
35#if 0
36 RCSID("$NetBSD: bcopy.S,v 1.2 2003/08/07 16:42:36 agc Exp $")
37#endif
38
39 /*
40 * (ov)bcopy (src,dst,cnt)
41 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
42 */
43
44#ifdef MEMCOPY
45ENTRY(memcpy)
46#else
47#ifdef MEMMOVE
48ENTRY(memmove)
49#else
50ENTRY(bcopy)
51#endif
52#endif
53#if defined(MEMCOPY) || defined(MEMMOVE)
54 movq %rdi,%rax /* return dst */
55#else
56 xchgq %rdi,%rsi
57#endif
58 movq %rdx,%rcx
59 movq %rdi,%r8
60 subq %rsi,%r8
61 cmpq %rcx,%r8 /* overlapping? */
62 jb 1f
63 cld /* nope, copy forwards. */
64 shrq $3,%rcx /* copy by words */
65 rep
66 movsq
67 movq %rdx,%rcx
68 andq $7,%rcx /* any bytes left? */
69 rep
70 movsb
71 ret
721:
73 addq %rcx,%rdi /* copy backwards. */
74 addq %rcx,%rsi
75 std
76 andq $7,%rcx /* any fractional bytes? */
77 decq %rdi
78 decq %rsi
79 rep
80 movsb
81 movq %rdx,%rcx /* copy remainder by words */
82 shrq $3,%rcx
83 subq $7,%rsi
84 subq $7,%rdi
85 rep
86 movsq
87 cld
88 ret
| 34
35#if 0
36 RCSID("$NetBSD: bcopy.S,v 1.2 2003/08/07 16:42:36 agc Exp $")
37#endif
38
39 /*
40 * (ov)bcopy (src,dst,cnt)
41 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
42 */
43
44#ifdef MEMCOPY
45ENTRY(memcpy)
46#else
47#ifdef MEMMOVE
48ENTRY(memmove)
49#else
50ENTRY(bcopy)
51#endif
52#endif
53#if defined(MEMCOPY) || defined(MEMMOVE)
54 movq %rdi,%rax /* return dst */
55#else
56 xchgq %rdi,%rsi
57#endif
58 movq %rdx,%rcx
59 movq %rdi,%r8
60 subq %rsi,%r8
61 cmpq %rcx,%r8 /* overlapping? */
62 jb 1f
63 cld /* nope, copy forwards. */
64 shrq $3,%rcx /* copy by words */
65 rep
66 movsq
67 movq %rdx,%rcx
68 andq $7,%rcx /* any bytes left? */
69 rep
70 movsb
71 ret
721:
73 addq %rcx,%rdi /* copy backwards. */
74 addq %rcx,%rsi
75 std
76 andq $7,%rcx /* any fractional bytes? */
77 decq %rdi
78 decq %rsi
79 rep
80 movsb
81 movq %rdx,%rcx /* copy remainder by words */
82 shrq $3,%rcx
83 subq $7,%rsi
84 subq $7,%rdi
85 rep
86 movsq
87 cld
88 ret
|
| 89#ifdef MEMCOPY
90END(memcpy)
91#else
92#ifdef MEMMOVE
93END(memmove)
94#else
95END(bcopy)
96#endif
97#endif
|
| |