xref: /titanic_52/usr/src/lib/libc/amd64/gen/byteorder.s (revision 06e46062ef4f5f4b687cbafb4518fb123fe23920)
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27	.ident	"%Z%%M%	%I%	%E% SMI"
28
29	.file	"%M%"
30
31#include "SYS.h"
32
33/*
34 *	unsigned long htonl( hl )
35 *	unsigned long ntohl( hl )
36 *	long hl;
37 *	reverses the byte order of 'uint32_t hl'
38 */
39	ENTRY(htonl)
40	ALTENTRY(ntohl)
41	movl	%edi, %eax	/* %eax = hl */
42	bswap	%eax		/* reverses the byte order of %eax */
43	ret			/* return (%eax) */
44	SET_SIZE(htonl)
45	SET_SIZE(ntohl)
46
47/*
48 *	unsigned short htons( hs )
49 *	short hs;
50 *
51 *	reverses the byte order in hs.
52 */
53	ENTRY(htons)
54	ALTENTRY(ntohs)
55	movl	%edi, %eax	/* %eax = hs */
56	bswap	%eax		/* reverses the byte order of %eax */
57	shrl	$16, %eax	/* moves high 16-bit to low 16-bit */
58	ret			/* return (%eax) */
59	SET_SIZE(htons)
60	SET_SIZE(ntohs)
61