LibertyBSD_kernel/sys/lib/libkern/arch/mips64/htonl.S

/*	$OpenBSD: htonl.S,v 1.4 2009/12/12 20:03:54 miod Exp $	*/
/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "DEFS.h"


/*
 * netorder = htonl(hostorder)
 * hostorder = ntohl(netorder)
 */
LEAF(htonl, 0)				# a0 = 0x11223344, return 0x44332211
ALEAF(ntohl)
#ifdef __MIPSEL__
	.set	noreorder
	srl	v1, a0, 24		# v1 = 0x00000011
	sll	v0, a0, 24		# v0 = 0x44000000
	or	v0, v0, v1
	and	v1, a0, 0xff00
	sll	v1, v1, 8		# v1 = 0x00330000
	or	v0, v0, v1
	srl	v1, a0, 8
	and	v1, v1, 0xff00		# v1 = 0x00002200
	j	ra
	or	v0, v0, v1
#else
	j	ra
	move	v0, a0
#endif
END(htonl)