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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "byteorder.s"
#include <sys/asm_linkage.h>
/*
* NOTE: htonll/ntohll, htonl/ntohl, and htons/ntohs are identical
* routines. As such, they could be implemented as a single routine,
* using multiple ALTENTRY/SET_SIZE definitions. We don't do this so
* that they will have unique addresses, allowing DTrace and
* other debuggers to tell them apart.
*/
/*
* unsigned long long htonll( hll )
* unsigned long long ntohll( hll )
* unsigned long long hll;
* reverses the byte order of 'uint64_t hll' on little endian machines
*/
ENTRY(htonll)
movq %rdi, %rax /* %rax = hll */
bswapq %rax /* reverses the byte order of %rax */
ret /* return (%rax) */
SET_SIZE(htonll)
ENTRY(ntohll)
movq %rdi, %rax /* %rax = hll */
bswapq %rax /* reverses the byte order of %rax */
ret /* return (%rax) */
SET_SIZE(ntohll)
/*
* unsigned long htonl( hl )
* unsigned long ntohl( hl )
* unsigned long hl;
* reverses the byte order of 'uint32_t hl' on little endian machines
*/
ENTRY(htonl)
movl %edi, %eax /* %eax = hl */
bswap %eax /* reverses the byte order of %eax */
ret /* return (%eax) */
SET_SIZE(htonl)
ENTRY(ntohl)
movl %edi, %eax /* %eax = hl */
bswap %eax /* reverses the byte order of %eax */
ret /* return (%eax) */
SET_SIZE(ntohl)
/*
* unsigned short htons( hs )
* unsigned short hs;
* reverses the byte order of 'uint16_t hs' on little endian machines.
*/
ENTRY(htons)
movl %edi, %eax /* %eax = hs */
bswap %eax /* reverses the byte order of %eax */
shrl $16, %eax /* moves high 16-bit to low 16-bit */
ret /* return (%eax) */
SET_SIZE(htons)
ENTRY(ntohs)
movl %edi, %eax /* %eax = hs */
bswap %eax /* reverses the byte order of %eax */
shrl $16, %eax /* moves high 16-bit to low 16-bit */
ret /* return (%eax) */
SET_SIZE(ntohs)
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