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byte_swap_4.S revision 1.5 
      1 /*	$NetBSD: byte_swap_4.S,v 1.5 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(bswap32)
     36 #if BYTE_ORDER == LITTLE_ENDIAN
     37 ALTENTRY(ntohl)
     38 ALTENTRY(htonl)
     39 #endif
     40 	swap.b	r4,r0
     41 	swap.w	r0,r0
     42 	rts
     43 	 swap.b	r0,r0
     44 
     45 #if BYTE_ORDER == BIG_ENDIAN
     46 ENTRY(ntohl)
     47 ALTENTRY(htonl)
     48 	rts
     49 	 mov	r4, r0
     50 #endif
     51