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      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 1.3 2024/06/07 20:50:13 riastradh Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/bitops.h>
     36 
     37 #include "namespace.h"
     38 
     39 #include <ieeefp.h>
     40 
     41 #include <aarch64/armreg.h>
     42 
     43 __weak_alias(fpsetmask,_fpsetmask)
     44 
     45 fp_except_t
     46 fpsetmask(fp_except_t mask)
     47 {
     48 	const uint32_t old_fpcr = reg_fpcr_read();
     49 	const uint32_t new_fpcr = (old_fpcr & ~FPCR_ESUM)
     50 	    | __SHIFTIN(mask, FPCR_ESUM);
     51 	reg_fpcr_write(new_fpcr);
     52 	return __SHIFTOUT(old_fpcr, FPCR_ESUM);
     53 }
     54