1/* $NetBSD: bswap16.S,v 1.5 2013/07/18 22:42:50 matt 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 BSWAP16 _C_LABEL(bswap16) 33#else /* defined(_KERNEL) || defined(_STANDALONE) */ 34#define BSWAP16 _C_LABEL(__bswap16) 35#endif /* defined(_KERNEL) || defined(_STANDALONE) */ 36 37_ENTRY(BSWAP16) 38#ifdef __mcfisac__ 39 mvzw 6(%sp),%d0 40 swap %d0 41 byterev %d0 42#elif defined(__mcoldfire__) 43 mvzw 6(%sp),%d0 44 movl %d0,%d1 45 mvzb %d0,%d0 46 lsll #8,%d0 47 lsrl #8,%d1 48 orl %d1,%d0 49#else 50 movl 4(%sp),%d0 51 rolw #8,%d0 52#endif 53 rts 54END(BSWAP16) 55