1/*        $NetBSD: bcopy.S,v 1.4 2011/01/25 02:38:15 matt Exp $       */
2/*
3 * Copyright (c) 1983, 1993
4 *        The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/* bcopy(from, to, size) */
32
33#include "DEFS.h"
34
35#if defined(LIBC_SCCS)
36          /* .asciz "@(#)bcopy.s        8.1 (Berkeley) 6/4/93" */
37RCSID("$NetBSD: bcopy.S,v 1.4 2011/01/25 02:38:15 matt Exp $")
38#endif
39
40
41ENTRY(bcopy, R6)
42          movl      4(%ap),%r1
43          movl      8(%ap),%r3
44          movl      12(%ap),%r6
45          cmpl      %r1,%r3
46          bgtr      2f                  # normal forward case
47          blss      3f                  # overlapping, must do backwards
48          ret                           # equal, nothing to do
491:
50          subl2     %r0,%r6
51          movc3     %r0,(%r1),(%r3)
522:
53          movzwl    $65535,%r0
54          cmpl      %r6,%r0
55          jgtr      1b
56          movc3     %r6,(%r1),(%r3)
57          ret
583:
59          addl2     %r6,%r1
60          addl2     %r6,%r3
61          movzwl    $65535,%r0
62          jbr       5f
634:
64          subl2     %r0,%r6
65          subl2     %r0,%r1
66          subl2     %r0,%r3
67          movc3     %r0,(%r1),(%r3)
68          movzwl    $65535,%r0
69          subl2     %r0,%r1
70          subl2     %r0,%r3
715:
72          cmpl      %r6,%r0
73          jgtr      4b
74          subl2     %r6,%r1
75          subl2     %r6,%r3
76          movc3     %r6,(%r1),(%r3)
77          ret
78END(bcopy)
79