1/* $NetBSD: byte_swap_4.S,v 1.2 2006/02/08 21:52:36 simonb Exp $ */ 2 3/*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <mips/asm.h> 36 37#if defined(LIBC_SCCS) && !defined(lint) 38 ASMSTR("from: @(#)htonl.s 8.1 (Berkeley) 6/4/93") 39 ASMSTR("$NetBSD: byte_swap_4.S,v 1.2 2006/02/08 21:52:36 simonb Exp $") 40#endif /* LIBC_SCCS and not lint */ 41 42#undef _LOCORE 43#define _LOCORE /* XXX not really, just assembly-code source */ 44#include <machine/endian.h> 45 46#if defined(_KERNEL) || defined(_STANDALONE) 47#define BSWAP32_NAME bswap32 48#else 49#ifdef __ABICALLS__ 50 .abicalls 51#endif 52#define BSWAP32_NAME __bswap32 53#endif 54 55NLEAF(BSWAP32_NAME) # a0 = 0x11223344, return 0x44332211 56#if BYTE_ORDER == LITTLE_ENDIAN 57ALEAF(htonl) # a0 = 0x11223344, return 0x44332211 58ALEAF(ntohl) 59#endif 60 srl v1, a0, 24 # v1 = 0x00000011 61 sll v0, a0, 24 # v0 = 0x44000000 62 or v0, v0, v1 63 and v1, a0, 0xff00 64 sll v1, v1, 8 # v1 = 0x00330000 65 or v0, v0, v1 66 srl v1, a0, 8 67 and v1, v1, 0xff00 # v1 = 0x00002200 68 or v0, v0, v1 69 j ra 70END(BSWAP32_NAME) 71 72#if BYTE_ORDER == BIG_ENDIAN 73NLEAF(htonl) # a0 = 0x11223344, return 0x44332211 74ALEAF(ntohl) 75 move v0, a0 76 j ra 77END(htonl) 78#endif 79