1/*        $NetBSD: bswap32.S,v 1.6 2014/03/18 18:20:35 riastradh Exp $          */
2
3/*
4 * Copyright (C) 1996 Scott Reynolds.  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. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <machine/asm.h>
30
31#if defined(_KERNEL) || defined(_STANDALONE)
32#define BSWAP32 _C_LABEL(bswap32)
33#else /* defined(_KERNEL) || defined(_STANDALONE) */
34#define BSWAP32 _C_LABEL(__bswap32)
35#endif /* defined(_KERNEL) || defined(_STANDALONE) */
36
37_ENTRY(BSWAP32)
38          movl      4(%sp),%d0
39#ifdef __mcfisac__
40          byterev   %d0
41#elif defined(__mcoldfire__)
42          movl      %d0,%d1
43          lsrl      #8,%d0              | ABCD -> 0ABC
44          andl      #0x00ff00ff,%d0     | 0ABC -> 0A0C
45          andl      #0x00ff00ff,%d1     | ABCD -> 0B0D
46          lsll      #8,%d1              | 0B0D -> B0D0
47          orl       %d1,%d0             | 0A0C | B0D0 -> BADC
48          swap      %d0                 | BADC -> DCBA
49#else
50          rolw      #8,%d0
51          swap      %d0
52          rolw      #8,%d0
53#endif
54          rts
55END(BSWAP32)
56