84 lines
2.7 KiB
ArmAsm
84 lines
2.7 KiB
ArmAsm
|
/* $NetBSD: byte_swap_2.S,v 1.3 2009/12/14 00:39:00 matt 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 <mips/asm.h>
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
#if 0
|
||
|
|
RCSID("from: @(#)htons.s 8.1 (Berkeley) 6/4/93")
|
||
|
|
#else
|
||
|
|
RCSID("$NetBSD: byte_swap_2.S,v 1.3 2009/12/14 00:39:00 matt Exp $")
|
||
|
|
#endif
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
#undef _LOCORE
|
||
|
|
#define _LOCORE /* XXX not really, just assembly-code source */
|
||
|
|
#include <machine/endian.h>
|
||
|
|
|
||
|
|
#if defined(_KERNEL) || defined(_STANDALONE)
|
||
|
|
#define BSWAP16_NAME bswap16
|
||
|
|
#else
|
||
|
|
#define BSWAP16_NAME __bswap16
|
||
|
|
#endif
|
||
|
|
|
||
|
|
NLEAF(BSWAP16_NAME)
|
||
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
||
|
|
ALEAF(htons)
|
||
|
|
ALEAF(ntohs)
|
||
|
|
#endif
|
||
|
|
#if (__mips == 32 || __mips == 64) && __mips_isa_rev == 2
|
||
|
|
/*
|
||
|
|
* If we are on MIPS32r2 or MIPS64r2, use the new instructions
|
||
|
|
*/
|
||
|
|
wsbh a0, a0 # word swap bytes within halfwords
|
||
|
|
and v0, a0, 0xffff # bound it to 16bits
|
||
|
|
j ra
|
||
|
|
#else
|
||
|
|
srl v0, a0, 8
|
||
|
|
and v0, v0, 0xff
|
||
|
|
sll v1, a0, 8
|
||
|
|
and v1, v1, 0xff00
|
||
|
|
or v0, v0, v1
|
||
|
|
j ra
|
||
|
|
#endif
|
||
|
|
END(BSWAP16_NAME)
|
||
|
|
|
||
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
||
|
|
NLEAF(htons)
|
||
|
|
ALEAF(ntohs)
|
||
|
|
move v0, a0
|
||
|
|
j ra
|
||
|
|
END(htons)
|
||
|
|
#endif
|