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
* 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 (c) 1988 AT&T */
/* All Rights Reserved */
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
/*
* C library -- gettimeofday
* int gettimeofday (struct timeval *tp);
*/
#include <sys/asm_linkage.h>
#include "SYS.h"
/*
* The interface below calls the trap (0x27) to get the timestamp in
* secs and nsecs. It than converts the nsecs value into usecs before
* it returns.
*
* The algorithm used to perform the division by 1000 is based upon
* algorithms for division based upon multiplication by invariant
* integers. Relevant sources for these algorithms are:
*
* Granlund, T.; Montgomery, P.L.: "Division by Invariant Integers using
* Multiplication". SIGPLAN Notices, Vol. 29, June 1994, page 61.
*
* Magenheimer, D.J.; et al: "Integer Multiplication and Division on the HP
* Precision Architecture". IEEE Transactions on Computers, Vol 37, No. 8,
* August 1988, page 980.
*
* Steele G.; Warren H.: Hacker's Delight. 2002 Pearson Education, Ch 10
*
*/
1: RETC