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@@ -0,0 +1,108 @@
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+/*
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+ NetWinder Floating Point Emulator
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+ (c) Rebel.COM, 1998,1999
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+ (c) Philip Blundell, 1999, 2001
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+
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+ Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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+
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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 2 of the License, or
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+ (at your option) any later version.
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+
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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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+
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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, write to the Free Software
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+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+*/
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+
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+#include "fpa11.h"
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+#include "fpopcode.h"
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+#include "fpa11.inl"
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+#include "fpmodule.h"
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+#include "fpmodule.inl"
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+#include "softfloat.h"
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+
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+unsigned int PerformFLT(const unsigned int opcode);
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+unsigned int PerformFIX(const unsigned int opcode);
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+
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+static unsigned int PerformComparison(const unsigned int opcode);
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+
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+unsigned int EmulateCPRT(const unsigned int opcode)
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+{
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+
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+ if (opcode & 0x800000) {
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+ /* This is some variant of a comparison (PerformComparison
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+ will sort out which one). Since most of the other CPRT
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+ instructions are oddball cases of some sort or other it
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+ makes sense to pull this out into a fast path. */
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+ return PerformComparison(opcode);
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+ }
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+
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+ /* Hint to GCC that we'd like a jump table rather than a load of CMPs */
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+ switch ((opcode & 0x700000) >> 20) {
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+ case FLT_CODE >> 20:
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+ return PerformFLT(opcode);
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+ break;
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+ case FIX_CODE >> 20:
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+ return PerformFIX(opcode);
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+ break;
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+
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+ case WFS_CODE >> 20:
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+ writeFPSR(readRegister(getRd(opcode)));
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+ break;
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+ case RFS_CODE >> 20:
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+ writeRegister(getRd(opcode), readFPSR());
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+ break;
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+
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+ default:
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+ return 0;
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+ }
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+
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+ return 1;
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+}
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+
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+unsigned int PerformFLT(const unsigned int opcode)
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+{
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+ FPA11 *fpa11 = GET_FPA11();
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+ struct roundingData roundData;
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+
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+ roundData.mode = SetRoundingMode(opcode);
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+ roundData.precision = SetRoundingPrecision(opcode);
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+ roundData.exception = 0;
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+
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+ switch (opcode & MASK_ROUNDING_PRECISION) {
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+ case ROUND_SINGLE:
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+ {
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+ fpa11->fType[getFn(opcode)] = typeSingle;
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+ fpa11->fpreg[getFn(opcode)].fSingle = int32_to_float32(&roundData, readRegister(getRd(opcode)));
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+ }
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+ break;
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+
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+ case ROUND_DOUBLE:
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+ {
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+ fpa11->fType[getFn(opcode)] = typeDouble;
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+ fpa11->fpreg[getFn(opcode)].fDouble = int32_to_float64(readRegister(getRd(opcode)));
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+ }
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+ break;
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+
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+#ifdef CONFIG_FPE_NWFPE_XP
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+ case ROUND_EXTENDED:
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+ {
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+ fpa11->fType[getFn(opcode)] = typeExtended;
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+ fpa11->fpreg[getFn(opcode)].fExtended = int32_to_floatx80(readRegister(getRd(opcode)));
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+ }
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+ break;
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+#endif
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+
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+ default:
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+ return 0;
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+ }
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+
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+ if (roundData.exception)
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+ float_raise(roundData.exception);
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+
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张婷