fpsetmask.c revision 1.1
1/*- 2 * Copyright (c) 2015 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Matt Thomas of 3am Software Foundry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h> 31 32__RCSID("$NetBSD: fpsetmask.c,v 1.1 2015/07/07 21:40:19 matt Exp $"); 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/bitops.h> 37 38#include "namespace.h" 39 40#include <ieeefp.h> 41 42#include <aarch64/armreg.h> 43 44__weak_alias(fpsetmask,_fpsetmask); 45 46fp_except_t 47fpsetmask(fp_except_t mask) 48{ 49 const uint32_t old_fpcr = reg_fpcr_read(); 50 const uint32_t new_fpcr = (old_fpcr & ~FPCR_ESUM) 51 | __SHIFTIN(mask, FPCR_ESUM); 52 reg_fpcr_write(new_fpcr); 53 return __SHIFTOUT(old_fpcr, FPCR_ESUM); 54} 55