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byte_swap_4.S revision 1.3.18.1 
      1 /*	$NetBSD: byte_swap_4.S,v 1.3.18.1 2007/08/28 17:35:30 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Neil A. Carson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <machine/asm.h>
     40 
     41 #if defined(_KERNEL) || defined(_STANDALONE)
     42 _ENTRY(_C_LABEL(bswap32))
     43 #else
     44 _ENTRY(_C_LABEL(__bswap32))
     45 #endif
     46 #if BYTE_ORDER == LITTLE_ENDIAN
     47 _ENTRY(_C_LABEL(ntohl))
     48 _ENTRY(_C_LABEL(htonl))
     49 #endif
     50 _PROF_PROLOGUE
     51 #ifdef __ARM_ARCH_6
     52 	rev		r0, r0
     53 #elif defined(__thumb__)
     54 	mov		r3, #16
     55 	mov		r2, r0
     56 	ror		r2, r2, r3
     57 	mov		r1, r0
     58 	eor		r1, r1, r2
     59 	mov		r2, #0xff
     60 	lsl		r2, r2, #16
     61 	bic		r1, r1, r3
     62 	mov		r2, #8
     63 	ror		r0, r0, r2
     64 	lsr		r1, r1, #8
     65 	eor		r0, r0, r1
     66 #else
     67 	eor		r1, r0, r0, ror #16
     68 	bic		r1, r1, #0x00FF0000
     69 	mov		r0, r0, ror #8
     70 	eor		r0, r0, r1, lsr #8
     71 #endif
     72 	RET
     73 #if defined(_KERNEL) || defined(_STANDALONE)
     74 	END(bswap32)
     75 #else
     76 	END(__bswap32)
     77 #endif
     78