4a1ef4d3d7
Overflow is still treated as Exit. Underflow is ignored in release mode as it happens every now and then and doesn't seem to cause issues if ignored, thus restoring 0.74 behaviour. Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4199
176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
/*
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* Copyright (C) 2002-2019 The DOSBox Team
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef DOSBOX_FPU_H
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#define DOSBOX_FPU_H
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#ifndef DOSBOX_DOSBOX_H
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//So the right config.h gets included for C_DEBUG
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#include "dosbox.h"
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#endif
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#ifndef DOSBOX_MEM_H
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#include "mem.h"
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#endif
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void FPU_ESC0_Normal(Bitu rm);
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void FPU_ESC0_EA(Bitu func,PhysPt ea);
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void FPU_ESC1_Normal(Bitu rm);
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void FPU_ESC1_EA(Bitu func,PhysPt ea);
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void FPU_ESC2_Normal(Bitu rm);
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void FPU_ESC2_EA(Bitu func,PhysPt ea);
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void FPU_ESC3_Normal(Bitu rm);
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void FPU_ESC3_EA(Bitu func,PhysPt ea);
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void FPU_ESC4_Normal(Bitu rm);
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void FPU_ESC4_EA(Bitu func,PhysPt ea);
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void FPU_ESC5_Normal(Bitu rm);
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void FPU_ESC5_EA(Bitu func,PhysPt ea);
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void FPU_ESC6_Normal(Bitu rm);
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void FPU_ESC6_EA(Bitu func,PhysPt ea);
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void FPU_ESC7_Normal(Bitu rm);
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void FPU_ESC7_EA(Bitu func,PhysPt ea);
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typedef union {
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double d;
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#ifndef WORDS_BIGENDIAN
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struct {
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Bit32u lower;
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Bit32s upper;
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} l;
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#else
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struct {
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Bit32s upper;
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Bit32u lower;
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} l;
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#endif
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Bit64s ll;
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} FPU_Reg;
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typedef struct {
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Bit32u m1;
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Bit32u m2;
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Bit16u m3;
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Bit16u d1;
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Bit32u d2;
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} FPU_P_Reg;
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enum FPU_Tag {
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TAG_Valid = 0,
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TAG_Zero = 1,
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TAG_Weird = 2,
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TAG_Empty = 3
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};
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enum FPU_Round {
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ROUND_Nearest = 0,
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ROUND_Down = 1,
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ROUND_Up = 2,
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ROUND_Chop = 3
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};
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typedef struct {
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FPU_Reg regs[9];
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FPU_P_Reg p_regs[9];
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FPU_Tag tags[9];
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Bit16u cw,cw_mask_all;
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Bit16u sw;
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Bit32u top;
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FPU_Round round;
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} FPU_rec;
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//get pi from a real library
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#define PI 3.14159265358979323846
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#define L2E 1.4426950408889634
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#define L2T 3.3219280948873623
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#define LN2 0.69314718055994531
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#define LG2 0.3010299956639812
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extern FPU_rec fpu;
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#define TOP fpu.top
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#define STV(i) ( (fpu.top+ (i) ) & 7 )
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Bit16u FPU_GetTag(void);
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void FPU_FLDCW(PhysPt addr);
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static INLINE void FPU_SetTag(Bit16u tag){
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for(Bitu i=0;i<8;i++)
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fpu.tags[i] = static_cast<FPU_Tag>((tag >>(2*i))&3);
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}
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static INLINE void FPU_SetCW(Bitu word){
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fpu.cw = (Bit16u)word;
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fpu.cw_mask_all = (Bit16u)(word | 0x3f);
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fpu.round = (FPU_Round)((word >> 10) & 3);
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}
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static INLINE Bitu FPU_GET_TOP(void) {
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return (fpu.sw & 0x3800)>>11;
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}
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static INLINE void FPU_SET_TOP(Bitu val){
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fpu.sw &= ~0x3800;
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fpu.sw |= (val&7)<<11;
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}
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static INLINE void FPU_SET_C0(Bitu C){
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fpu.sw &= ~0x0100;
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if(C) fpu.sw |= 0x0100;
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}
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static INLINE void FPU_SET_C1(Bitu C){
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fpu.sw &= ~0x0200;
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if(C) fpu.sw |= 0x0200;
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}
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static INLINE void FPU_SET_C2(Bitu C){
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fpu.sw &= ~0x0400;
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if(C) fpu.sw |= 0x0400;
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}
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static INLINE void FPU_SET_C3(Bitu C){
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fpu.sw &= ~0x4000;
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if(C) fpu.sw |= 0x4000;
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}
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#define DB_FPU_STACK_CHECK_NONE 0
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#define DB_FPU_STACK_CHECK_LOG 1
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#define DB_FPU_STACK_CHECK_EXIT 2
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//NONE is 0.74 behavior: not care about stack overflow/underflow
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//Overflow is always logged/exited on.
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//Underflow can be controlled with by this.
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//LOG is giving a message when encountered
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//EXIT is to hard exit.
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//Currently pop is ignored in release mode and overflow is exit.
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//in debug mode: pop will log and overflow is exit.
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#if C_DEBUG
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#define DB_FPU_STACK_CHECK_POP DB_FPU_STACK_CHECK_LOG
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#define DB_FPU_STACK_CHECK_PUSH DB_FPU_STACK_CHECK_EXIT
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#else
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#define DB_FPU_STACK_CHECK_POP DB_FPU_STACK_CHECK_NONE
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#define DB_FPU_STACK_CHECK_PUSH DB_FPU_STACK_CHECK_EXIT
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#endif
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#endif
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