85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
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/* $NetBSD: fpsetsticky.c,v 1.2 2008/04/28 20:22:57 martin Exp $ */
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/*
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: fpsetsticky.c,v 1.2 2008/04/28 20:22:57 martin Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <ieeefp.h>
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#include <powerpc/fpu.h>
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#define STICKYBITS (FPSCR_XX|FPSCR_ZX|FPSCR_UX|FPSCR_OX|FPSCR_VX)
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#define INVBITS (FPSCR_VXCVI|FPSCR_VXSQRT|FPSCR_VXSOFT|FPSCR_VXVC|\
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FPSCR_VXIMZ|FPSCR_VXZDZ|FPSCR_VXIDI|FPSCR_VXISI|\
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FPSCR_VXSNAN)
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#define STICKYSHFT 25
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#ifdef __weak_alias
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__weak_alias(fpsetsticky,_fpsetsticky)
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#endif
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fp_except
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fpsetsticky(fp_except mask)
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{
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uint64_t fpscr;
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fp_except old;
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__asm volatile("mffs %0" : "=f"(fpscr));
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old = ((uint32_t)fpscr & STICKYBITS) >> STICKYSHFT;
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/*
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* FPSCR_VX (aka FP_X_INV) is not a sticky bit but a summary of the
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* all the FPSCR_VX* sticky bits. So when FP_X_INV is cleared then
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* clear all of those bits, likewise when it's set, set them all.
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*/
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if ((mask & FP_X_INV) == 0)
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fpscr &= ~INVBITS;
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else
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fpscr |= INVBITS;
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fpscr &= ~STICKYBITS;
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fpscr |= ((uint32_t)mask << STICKYSHFT) & STICKYBITS;
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/*
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* Make FPSCR_FX reflect the presence of a set sticky bit (or not).
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*/
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if (fpscr & (STICKYBITS|INVBITS))
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fpscr |= FPSCR_FX;
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else
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fpscr &= ~FPSCR_FX;
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/*
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* Write back the fpscr.
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*/
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__asm volatile("mtfsf 0xff,%0" :: "f"(fpscr));
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return (old);
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}
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