gettimeofday.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
#include <sys/asm_linkage.h>
ANSI_PRAGMA_WEAK(gettimeofday,function)
#include "SYS.h"
/*
* implements int gettimeofday(struct timeval *tp, void *tzp)
*
* note that tzp is always ignored
*/
ENTRY(_gettimeofday)
/*
* use long long gethrestime()
*/
pushq %rdi /* pointer to timeval */
SYSFASTTRAP(GETHRESTIME)
/*
* gethrestime trap returns seconds in %eax, nsecs in %edx
* need to convert nsecs to usecs & store into area pointed
* to by struct timeval * argument.
*/
popq %rcx /* pointer to timeval */
jrcxz 1f /* bail if we get a null pointer */
movq %rax, (%rcx) /* store seconds into timeval ptr */
movl $274877907, %eax /* divide by 1000 as impl. by gcc */
imull %edx /* See Hacker's Delight pg 162 */
sarl $6, %edx /* simplified by 0 <= nsec <= 1e9 */
movq %rdx, 8(%rcx) /* store usecs into timeval ptr + 8. */
1:
RETC /* return 0 */
SET_SIZE(_gettimeofday)