384ee7cc6e
Building R on powerpc64 exposed a problem in fpsetmask() whereby we were not properly clamping the provided mask to the valid range. This same issue affects powerpc and powerpcspe. Properly limit the range of bits that can be set via fpsetmask(). While here, use the correct fp_except_t type instead of fp_rnd_t. Reported by: pkubaj, jhibbits (in IRC) Sponsored by: Tag1 Consulting, Inc. MFC after: 1 week
54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
/* $NetBSD: fpsetmask.c,v 1.3 2002/01/13 21:45:48 thorpej Exp $ */
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/*
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* Copyright (c) 2016 Justin Hibbits
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Dan Winship.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <machine/spr.h>
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#include <ieeefp.h>
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#ifndef _SOFT_FLOAT
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fp_except_t
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fpsetmask(fp_except_t mask)
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{
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uint32_t fpscr;
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fp_except_t old;
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__asm__ __volatile("mfspr %0, %1" : "=r"(fpscr) : "K"(SPR_SPEFSCR));
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old = (fp_except_t)((fpscr >> 2) & 0x1f);
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fpscr = (fpscr & 0xffffff83) | ((mask & 0x1f) << 2);
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__asm__ __volatile("mtspr %1,%0;isync" :: "r"(fpscr), "K"(SPR_SPEFSCR));
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return (old);
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}
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#endif
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