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      1  1.6      matt /*	$NetBSD: byte_swap_2.S,v 1.6 2013/08/19 03:44:18 matt Exp $	*/
      2  1.1  christos 
      3  1.1  christos /*-
      4  1.1  christos  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  1.1  christos  * All rights reserved.
      6  1.1  christos  *
      7  1.1  christos  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1  christos  * by Charles M. Hannum.
      9  1.1  christos  *
     10  1.1  christos  * Redistribution and use in source and binary forms, with or without
     11  1.1  christos  * modification, are permitted provided that the following conditions
     12  1.1  christos  * are met:
     13  1.1  christos  * 1. Redistributions of source code must retain the above copyright
     14  1.1  christos  *    notice, this list of conditions and the following disclaimer.
     15  1.1  christos  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1  christos  *    notice, this list of conditions and the following disclaimer in the
     17  1.1  christos  *    documentation and/or other materials provided with the distribution.
     18  1.1  christos  *
     19  1.1  christos  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1  christos  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1  christos  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1  christos  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1  christos  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1  christos  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1  christos  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1  christos  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1  christos  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1  christos  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1  christos  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1  christos  */
     31  1.1  christos 
     32  1.1  christos #include <machine/asm.h>
     33  1.1  christos 
     34  1.2       uwe #if defined(_KERNEL) || defined(_STANDALONE)
     35  1.6      matt #define FUNC _C_LABEL(bswap16)
     36  1.2       uwe #else
     37  1.6      matt #define FUNC _C_LABEL(__bswap16)
     38  1.2       uwe #endif
     39  1.6      matt 
     40  1.6      matt ENTRY(FUNC)
     41  1.5      matt #ifdef _ARM_ARCH_6
     42  1.5      matt 	rev16		r0, r0
     43  1.6      matt #elif !defined(__thumb__)
     44  1.1  christos 	and		r1, r0, #0xff
     45  1.1  christos 	mov		r0, r0, lsr #8
     46  1.1  christos 	orr		r0, r0, r1, lsl #8
     47  1.6      matt #else
     48  1.6      matt 	movs		r2, #0xff
     49  1.6      matt 	movs		r1, r0
     50  1.6      matt 	ands		r1, r1, r2
     51  1.6      matt 	lsls		r1, r1, #8
     52  1.6      matt 	lsrs		r0, r0, #8
     53  1.6      matt 	ands		r0, r0, r2
     54  1.6      matt 	orrs		r0, r0, r1
     55  1.5      matt #endif
     56  1.1  christos 	RET
     57  1.6      matt END(FUNC)
     58  1.6      matt #if BYTE_ORDER == LITTLE_ENDIAN
     59  1.6      matt STRONG_ALIAS(_C_LABEL(ntohs), FUNC)
     60  1.6      matt STRONG_ALIAS(_C_LABEL(htons), FUNC)
     61  1.6      matt #endif
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