1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .ident "%Z%%M% %I% %E% SMI" 27 28 .file "%M%" 29 30#include "SYS.h" 31 32 /* 33 * NOTE: htonl/ntohl are identical routines, as are htons/ntohs. 34 * As such, they could be implemented as a single routine, using 35 * multiple ALTENTRY/SET_SIZE definitions. We don't do this so 36 * that they will have unique addresses, allowing DTrace and 37 * other debuggers to tell them apart. 38 */ 39 40/ unsigned long htonl( hl ) 41/ unsigned long ntohl( hl ) 42/ long hl; 43/ reverses the byte order of 'long hl' 44/ 45 ENTRY(htonl) 46 movl 4(%esp), %eax / %eax = hl 47 bswap %eax / reverses the byte order of %eax 48 ret / return (%eax) 49 SET_SIZE(htonl) 50 51 ENTRY(ntohl) 52 movl 4(%esp), %eax / %eax = hl 53 bswap %eax / reverses the byte order of %eax 54 ret / return (%eax) 55 SET_SIZE(ntohl) 56 57/ unsigned short htons( hs ) 58/ short hs; 59/ 60/ reverses the byte order in hs. 61/ 62 ENTRY(htons) 63 movl 4(%esp), %eax / %eax = hs 64 bswap %eax / reverses the byte order of %eax 65 shrl $16, %eax / moves high 16-bit to low 16-bit 66 ret / return (%eax) 67 SET_SIZE(htons) 68 69 ENTRY(ntohs) 70 movl 4(%esp), %eax / %eax = hs 71 bswap %eax / reverses the byte order of %eax 72 shrl $16, %eax / moves high 16-bit to low 16-bit 73 ret / return (%eax) 74 SET_SIZE(ntohs) 75