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111 lines
4.1 KiB
C
111 lines
4.1 KiB
C
/*
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* Fast486 386/486 CPU Emulation Library
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* fpu.h
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*
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* Copyright (C) 2015 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _FPU_H_
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#define _FPU_H_
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#pragma once
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#include "opcodes.h"
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/* DEFINES ********************************************************************/
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#define FPU_CHECK() if (State->ControlRegisters[FAST486_REG_CR0] & (FAST486_CR0_EM | FAST486_CR0_TS)) \
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{ \
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Fast486Exception(State, FAST486_EXCEPTION_NM); \
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return; \
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}
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#define FPU_INDEX(i) ((State->FpuStatus.Top + (i)) % FAST486_NUM_FPU_REGS)
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#define FPU_ST(i) State->FpuRegisters[FPU_INDEX(i)]
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#define FPU_GET_TAG(i) ((State->FpuTag >> (FPU_INDEX(i) * 2)) & 3)
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#define FPU_SET_TAG(i, t) { \
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State->FpuTag &= ~((1 << (FPU_INDEX(i) * 2)) | (1 << ((FPU_INDEX(i) * 2) + 1))); \
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State->FpuTag |= ((t) & 3) << (FPU_INDEX(i) * 2); \
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}
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#define FPU_UPDATE_TAG(i) FPU_SET_TAG((i), Fast486FpuGetValueTag(&FPU_ST(i)))
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#define FPU_SAVE_LAST_INST() { \
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State->FpuLastInstPtr = State->SavedInstPtr; \
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State->FpuLastCodeSel = State->SegmentRegs[FAST486_REG_CS].Selector; \
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}
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#define FPU_SAVE_LAST_OPERAND() { \
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State->FpuLastOpPtr.Long = ModRegRm.MemoryAddress; \
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State->FpuLastDataSel = (State->PrefixFlags & FAST486_PREFIX_SEG) \
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? State->SegmentOverride : FAST486_REG_DS; \
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}
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#define FPU_REAL4_BIAS 0x7F
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#define FPU_REAL8_BIAS 0x3FF
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#define FPU_REAL10_BIAS 0x3FFF
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#define FPU_MAX_EXPONENT 0x7FFE
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#define FPU_MANTISSA_HIGH_BIT 0x8000000000000000ULL
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#define FPU_INDEFINITE_MANTISSA 0xC000000000000000ULL
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#define FPU_REAL4_INFINITY 0x7F800000
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#define FPU_REAL4_INDEFINITE 0xFFC00000
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#define FPU_REAL8_INFINITY 0x7FF0000000000000ULL
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#define FPU_REAL8_INDEFINITE 0xFFF8000000000000ULL
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#define FPU_IS_NORMALIZED(x) (FPU_IS_ZERO(x) || (((x)->Mantissa & FPU_MANTISSA_HIGH_BIT) != 0ULL))
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#define FPU_IS_ZERO(x) ((x)->Mantissa == 0ULL)
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#define FPU_IS_NAN(x) ((x)->Exponent == (FPU_MAX_EXPONENT + 1))
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#define FPU_IS_INFINITY(x) (FPU_IS_NAN(x) && ((x)->Mantissa == FPU_MANTISSA_HIGH_BIT))
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#define FPU_IS_POS_INF(x) (FPU_IS_INFINITY(x) && !(x)->Sign)
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#define FPU_IS_NEG_INF(x) (FPU_IS_INFINITY(x) && (x)->Sign)
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#define FPU_IS_INDEFINITE(x) (FPU_IS_NAN(x) && !FPU_IS_INFINITY(x))
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#define INVERSE_NUMBERS_COUNT 50
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enum
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{
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FPU_SINGLE_PRECISION = 0,
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FPU_DOUBLE_PRECISION = 2,
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FPU_DOUBLE_EXT_PRECISION = 3
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};
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enum
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{
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FPU_TAG_VALID = 0,
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FPU_TAG_ZERO = 1,
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FPU_TAG_SPECIAL = 2,
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FPU_TAG_EMPTY = 3
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};
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enum
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{
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FPU_ROUND_NEAREST = 0,
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FPU_ROUND_DOWN = 1,
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FPU_ROUND_UP = 2,
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FPU_ROUND_TRUNCATE = 3
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};
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD8);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDA);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDB);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDC);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDD);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDE);
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FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDF);
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#endif // _FPU_H_
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/* EOF */
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