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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .file "byteorder.s" 27 28#include <sys/asm_linkage.h> 29 30 /* 31 * NOTE: htonll/ntohll, htonl/ntohl, and htons/ntohs are identical 32 * routines. As such, they could be implemented as a single routine, 33 * using 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 * unsigned long long htonll( hll ) 40 * unsigned long long ntohll( hll ) 41 * unsigned long long hll; 42 * reverses the byte order of 'uint64_t hll' on little endian machines 43 */ 44 ENTRY(htonll) 45 movq %rdi, %rax /* %rax = hll */ 46 bswapq %rax /* reverses the byte order of %rax */ 47 ret /* return (%rax) */ 48 SET_SIZE(htonll) 49 50 ENTRY(ntohll) 51 movq %rdi, %rax /* %rax = hll */ 52 bswapq %rax /* reverses the byte order of %rax */ 53 ret /* return (%rax) */ 54 SET_SIZE(ntohll) 55 56 57/* 58 * unsigned long htonl( hl ) 59 * unsigned long ntohl( hl ) 60 * unsigned long hl; 61 * reverses the byte order of 'uint32_t hl' on little endian machines 62 */ 63 ENTRY(htonl) 64 movl %edi, %eax /* %eax = hl */ 65 bswap %eax /* reverses the byte order of %eax */ 66 ret /* return (%eax) */ 67 SET_SIZE(htonl) 68 69 ENTRY(ntohl) 70 movl %edi, %eax /* %eax = hl */ 71 bswap %eax /* reverses the byte order of %eax */ 72 ret /* return (%eax) */ 73 SET_SIZE(ntohl) 74 75/* 76 * unsigned short htons( hs ) 77 * unsigned short hs; 78 * reverses the byte order of 'uint16_t hs' on little endian machines. 79 */ 80 ENTRY(htons) 81 movl %edi, %eax /* %eax = hs */ 82 bswap %eax /* reverses the byte order of %eax */ 83 shrl $16, %eax /* moves high 16-bit to low 16-bit */ 84 ret /* return (%eax) */ 85 SET_SIZE(htons) 86 87 ENTRY(ntohs) 88 movl %edi, %eax /* %eax = hs */ 89 bswap %eax /* reverses the byte order of %eax */ 90 shrl $16, %eax /* moves high 16-bit to low 16-bit */ 91 ret /* return (%eax) */ 92 SET_SIZE(ntohs) 93