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 .file "byteorder.s" 27 28#include "SYS.h" 29 30 /* 31 * NOTE: htonl/ntohl are identical routines, as are htons/ntohs. 32 * As such, they could be implemented as a single routine, using 33 * multiple ALTENTRY/SET_SIZE definitions. We don't do this so 34 * that they will have unique addresses, allowing DTrace and 35 * other debuggers to tell them apart. 36 */ 37 38 39/* 40 * unsigned long htonl( hl ) 41 * unsigned long ntohl( hl ) 42 * long hl; 43 * reverses the byte order of 'uint32_t hl' 44 */ 45 ENTRY(htonl) 46 movl %edi, %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 %edi, %eax /* %eax = hl */ 53 bswap %eax /* reverses the byte order of %eax */ 54 ret /* return (%eax) */ 55 SET_SIZE(ntohl) 56 57/* 58 * unsigned short htons( hs ) 59 * short hs; 60 * 61 * reverses the byte order in hs. 62 */ 63 ENTRY(htons) 64 movl %edi, %eax /* %eax = hs */ 65 bswap %eax /* reverses the byte order of %eax */ 66 shrl $16, %eax /* moves high 16-bit to low 16-bit */ 67 ret /* return (%eax) */ 68 SET_SIZE(htons) 69 70 ENTRY(ntohs) 71 movl %edi, %eax /* %eax = hs */ 72 bswap %eax /* reverses the byte order of %eax */ 73 shrl $16, %eax /* moves high 16-bit to low 16-bit */ 74 ret /* return (%eax) */ 75 SET_SIZE(ntohs) 76