1/* $NetBSD: fpgetround.c,v 1.9 2008/04/28 20:22:56 martin Exp $ */ 2 3/* 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Dan Winship. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34__RCSID("$NetBSD: fpgetround.c,v 1.9 2008/04/28 20:22:56 martin Exp $"); 35#endif /* LIBC_SCCS and not lint */ 36 37#include "namespace.h" 38 39#include <sys/types.h> 40#include <ieeefp.h> 41#include <powerpc/fpu.h> 42 43#ifdef __weak_alias 44__weak_alias(fpgetround,_fpgetround) 45#endif 46 47#define ROUNDBITS FPSCR_RN 48#define ROUNDSHFT 0 49 50fp_rnd 51fpgetround(void) 52{ 53 union { 54 double u_d; 55 uint64_t u_fpscr; 56 } ud; 57 58 __asm volatile("mffs %0" : "=f"(ud.u_d)); 59 return (((uint32_t)ud.u_fpscr & ROUNDBITS) >> ROUNDSHFT); 60} 61