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      1 /*	$NetBSD: fpsetmask.c,v 1.2 2008/04/28 20:22:57 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: fpsetmask.c,v 1.2 2008/04/28 20:22:57 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(fpsetmask,_fpsetmask)
     45 #endif
     46 
     47 #define	MASKBITS	(FPSCR_XE|FPSCR_ZE|FPSCR_UE|FPSCR_OE|FPSCR_VE)
     48 #define	MASKSHFT	3
     49 
     50 fp_except
     51 fpsetmask(fp_except mask)
     52 {
     53 	uint64_t fpscr;
     54 	fp_except old;
     55 
     56 	__asm volatile("mffs %0" : "=f"(fpscr));
     57 	old = ((uint32_t)fpscr & MASKBITS) >> MASKSHFT;
     58 	fpscr &= ~MASKBITS;
     59 	fpscr |= ((uint32_t)mask << MASKSHFT) & MASKBITS;
     60 	__asm volatile("mtfsf 0xff,%0" :: "f"(fpscr));
     61 	return (old);
     62 }
     63