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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .file "gettimeofday.s" 28 29#include "SYS.h" 30 31 ANSI_PRAGMA_WEAK(gettimeofday,function) 32 33/ 34/ implements int gettimeofday(struct timeval *tp, void *tzp) 35/ 36/ note that tzp is always ignored 37/ 38 39 ENTRY(gettimeofday) 40/ 41/ use long long gethrestime() 42/ 43 SYSFASTTRAP(GETHRESTIME) 44/ 45/ gethrestime trap returns seconds in %eax, nsecs in %edx 46/ need to convert nsecs to usecs & store into area pointed 47/ to by struct timeval * argument. 48/ 49 movl 4(%esp), %ecx / put ptr to timeval in %ecx 50 jecxz 1f / bail if we get a null pointer 51 movl %eax, (%ecx) / store seconds into timeval ptr 52 movl $274877907, %eax / divide by 1000 as impl. by gcc 53 imull %edx / See Hacker's Delight pg 162 54 sarl $6, %edx / simplified by 0 <= nsec <= 1e9 55 movl %edx, 4(%ecx) / store usecs into timeval ptr + 4. 561: 57 RETC / return 0 58 SET_SIZE(gettimeofday) 59 60 61