derek.holloway
7502bf64a4
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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* This file is part of SIS (SPARC instruction simulator)
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Copyright (C) 1995-2024 Free Software Foundation, Inc.
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Contributed by Jiri Gaisler, European Space Agency
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This file implements the interface between the host and the simulated
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FPU. IEEE trap handling is done as follows:
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1. In the host, all IEEE traps are masked
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2. After each simulated FPU instruction, check if any exception
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occurred by reading the exception bits from the host FPU status
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register (get_accex()).
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3. Propagate any exceptions to the simulated FSR.
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4. Clear host exception bits.
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*/
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/* This must come before any other includes. */
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#include "defs.h"
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#include "sis.h"
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#include <fenv.h>
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/* This routine should return the accrued exceptions */
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int
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get_accex(void)
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{
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int fexc, accx;
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fexc = fetestexcept (FE_ALL_EXCEPT);
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accx = 0;
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if (fexc & FE_INEXACT)
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accx |= 1;
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if (fexc & FE_DIVBYZERO)
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accx |= 2;
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if (fexc & FE_UNDERFLOW)
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accx |= 4;
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if (fexc & FE_OVERFLOW)
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accx |= 8;
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if (fexc & FE_INVALID)
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accx |= 0x10;
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return accx;
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}
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/* How to clear the accrued exceptions */
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void
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clear_accex(void)
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{
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feclearexcept (FE_ALL_EXCEPT);
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}
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/* How to map SPARC FSR onto the host */
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void
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set_fsr(uint32_t fsr)
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{
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int fround;
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fsr >>= 30;
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switch (fsr) {
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case 0:
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fround = FE_TONEAREST;
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break;
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case 1:
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fround = FE_TOWARDZERO;
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break;
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case 2:
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fround = FE_UPWARD;
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break;
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case 3:
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fround = FE_DOWNWARD;
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break;
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}
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fesetround (fround);
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}
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