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 pushq %rdi /* pointer to timeval */ 44 SYSFASTTRAP(GETHRESTIME) 45/* 46 * gethrestime trap returns seconds in %eax, nsecs in %edx 47 * need to convert nsecs to usecs & store into area pointed 48 * to by struct timeval * argument. 49 */ 50 popq %rcx /* pointer to timeval */ 51 jrcxz 1f /* bail if we get a null pointer */ 52 movq %rax, (%rcx) /* store seconds into timeval ptr */ 53 movl $274877907, %eax /* divide by 1000 as impl. by gcc */ 54 imull %edx /* See Hacker's Delight pg 162 */ 55 sarl $6, %edx /* simplified by 0 <= nsec <= 1e9 */ 56 movq %rdx, 8(%rcx) /* store usecs into timeval ptr + 8. */ 571: 58 RETC /* return 0 */ 59 SET_SIZE(gettimeofday) 60 61