/*
* 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 (c) 1992, 2011, Oracle and/or its affiliates. All rights reserved.
*/
.file "gettimeofday.s"
#include "SYS.h"
ANSI_PRAGMA_WEAK(gettimeofday,function)
/
/ implements int gettimeofday(struct timeval *tp, void *tzp)
/
/ note that tzp is always ignored
/
/ gettimeofday is implemented as an alternate capability symbol
/ on x86 systems which support the rdtscp instruction.
/
ENTRY(gettimeofday)
/
/ use long long gethrestime()
/
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.
/
movl 4(%esp), %ecx / put ptr to timeval in %ecx
jecxz 1f / bail if we get a null pointer
movl %eax, (%ecx) / 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
movl %edx, 4(%ecx) / store usecs into timeval ptr + 4.
1:
RETC / return 0
SET_SIZE(gettimeofday)