byte_swap_2.S revision 1.6
1 /* $NetBSD: byte_swap_2.S,v 1.6 2006/04/14 09:23:01 nonaka Exp $ */ 2 3 /*- 4 * Copyright (C) 1999 SHIMIZU Ryo. 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 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <machine/asm.h> 30 31 #undef _LOCORE 32 #define _LOCORE /* XXX not really, just assembly-code source */ 33 #include <machine/endian.h> 34 35 ENTRY(bswap16) 36 #if BYTE_ORDER == LITTLE_ENDIAN 37 ALTENTRY(ntohs) 38 ALTENTRY(htons) 39 #endif 40 extu.w r4, r4 41 rts 42 swap.b r4, r0 43 44 #if BYTE_ORDER == BIG_ENDIAN 45 ENTRY(ntohs) 46 ALTENTRY(htons) 47 rts 48 extu.w r4, r0 49 #endif 50
Indexes created Sat Sep 20 22:09:52 GMT 2025