1/*        $NetBSD: blkcpy.S,v 1.4 2005/12/11 12:24:45 christos 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#include <machine/asm.h>
31
32/* __blkcpy(from, to, size) */
33
34ENTRY(__blkcpy, R6)
35          movl      4(%ap),%r1
36          movl      8(%ap),%r3
37          movl      12(%ap),%r6
38          cmpl      %r1,%r3
39          bgtr      2f                  # normal forward case
40          blss      3f                  # overlapping, must do backwards
41          ret                           # equal, nothing to do
421:
43          subl2     %r0,%r6
44          movc3     %r0,(%r1),(%r3)
452:
46          movzwl    $65535,%r0
47          cmpl      %r6,%r0
48          jgtr      1b
49          movc3     %r6,(%r1),(%r3)
50          ret
513:
52          addl2     %r6,%r1
53          addl2     %r6,%r3
54          movzwl    $65535,%r0
55          jbr       5f
564:
57          subl2     %r0,%r6
58          subl2     %r0,%r1
59          subl2     %r0,%r3
60          movc3     %r0,(%r1),(%r3)
61          movzwl    $65535,%r0
62          subl2     %r0,%r1
63          subl2     %r0,%r3
645:
65          cmpl      %r6,%r0
66          jgtr      4b
67          subl2     %r6,%r1
68          subl2     %r6,%r3
69          movc3     %r6,(%r1),(%r3)
70          ret
71