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fpu.h
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1/*
2 * Fast486 386/486 CPU Emulation Library
3 * fpu.h
4 *
5 * Copyright (C) 2015 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 */
21
22#ifndef _FPU_H_
23#define _FPU_H_
24
25#pragma once
26
27#include "opcodes.h"
28
29/* DEFINES ********************************************************************/
30
31#define FPU_CHECK() if (State->ControlRegisters[FAST486_REG_CR0] & (FAST486_CR0_EM | FAST486_CR0_TS)) \
32 { \
33 Fast486Exception(State, FAST486_EXCEPTION_NM); \
34 return; \
35 }
36#define FPU_INDEX(i) ((State->FpuStatus.Top + (i)) % FAST486_NUM_FPU_REGS)
37#define FPU_ST(i) State->FpuRegisters[FPU_INDEX(i)]
38
39#define FPU_GET_TAG(i) ((State->FpuTag >> (FPU_INDEX(i) * 2)) & 3)
40#define FPU_SET_TAG(i, t) { \
41 State->FpuTag &= ~((1 << (FPU_INDEX(i) * 2)) | (1 << ((FPU_INDEX(i) * 2) + 1))); \
42 State->FpuTag |= ((t) & 3) << (FPU_INDEX(i) * 2); \
43 }
44#define FPU_UPDATE_TAG(i) FPU_SET_TAG((i), Fast486FpuGetValueTag(&FPU_ST(i)))
45#define FPU_SAVE_LAST_INST() { \
46 State->FpuLastInstPtr = State->SavedInstPtr; \
47 State->FpuLastCodeSel = State->SegmentRegs[FAST486_REG_CS].Selector; \
48 }
49#define FPU_SAVE_LAST_OPERAND() { \
50 State->FpuLastOpPtr.Long = ModRegRm.MemoryAddress; \
51 State->FpuLastDataSel = (State->PrefixFlags & FAST486_PREFIX_SEG) \
52 ? State->SegmentOverride : FAST486_REG_DS; \
53 }
54
55#define FPU_REAL4_BIAS 0x7F
56#define FPU_REAL8_BIAS 0x3FF
57#define FPU_REAL10_BIAS 0x3FFF
58#define FPU_MAX_EXPONENT 0x7FFE
59#define FPU_MANTISSA_HIGH_BIT 0x8000000000000000ULL
60#define FPU_INDEFINITE_MANTISSA 0xC000000000000000ULL
61#define FPU_REAL4_INFINITY 0x7F800000
62#define FPU_REAL4_INDEFINITE 0xFFC00000
63#define FPU_REAL8_INFINITY 0x7FF0000000000000ULL
64#define FPU_REAL8_INDEFINITE 0xFFF8000000000000ULL
65
66#define FPU_IS_NORMALIZED(x) (FPU_IS_ZERO(x) || (((x)->Mantissa & FPU_MANTISSA_HIGH_BIT) != 0ULL))
67#define FPU_IS_ZERO(x) ((x)->Mantissa == 0ULL)
68#define FPU_IS_NAN(x) ((x)->Exponent == (FPU_MAX_EXPONENT + 1))
69#define FPU_IS_INFINITY(x) (FPU_IS_NAN(x) && ((x)->Mantissa == FPU_MANTISSA_HIGH_BIT))
70#define FPU_IS_POS_INF(x) (FPU_IS_INFINITY(x) && !(x)->Sign)
71#define FPU_IS_NEG_INF(x) (FPU_IS_INFINITY(x) && (x)->Sign)
72#define FPU_IS_INDEFINITE(x) (FPU_IS_NAN(x) && !FPU_IS_INFINITY(x))
73
74#define INVERSE_NUMBERS_COUNT 50
75
76enum
77{
81};
82
83enum
84{
89};
90
91enum
92{
97};
98
99FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD8);
100FAST486_OPCODE_HANDLER(Fast486FpuOpcodeD9);
101FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDA);
102FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDB);
103FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDC);
104FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDD);
105FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDE);
106FAST486_OPCODE_HANDLER(Fast486FpuOpcodeDF);
107
108#endif // _FPU_H_
109
110/* EOF */
@ FPU_TAG_VALID
Definition: fpu.h:85
@ FPU_TAG_SPECIAL
Definition: fpu.h:87
@ FPU_TAG_EMPTY
Definition: fpu.h:88
@ FPU_TAG_ZERO
Definition: fpu.h:86
@ FPU_ROUND_UP
Definition: fpu.h:95
@ FPU_ROUND_TRUNCATE
Definition: fpu.h:96
@ FPU_ROUND_NEAREST
Definition: fpu.h:93
@ FPU_ROUND_DOWN
Definition: fpu.h:94
@ FPU_DOUBLE_PRECISION
Definition: fpu.h:79
@ FPU_SINGLE_PRECISION
Definition: fpu.h:78
@ FPU_DOUBLE_EXT_PRECISION
Definition: fpu.h:80
#define FAST486_OPCODE_HANDLER(x)
Definition: opcodes.h:31