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/*
* Copyright (C) 2002-2021 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef DOSBOX_FPU_H
#define DOSBOX_FPU_H
#ifndef DOSBOX_DOSBOX_H
//So the right config.h gets included for C_DEBUG
#include "dosbox.h"
#endif
#ifndef DOSBOX_MEM_H
#include "mem.h"
#endif
void FPU_ESC0_Normal(Bitu rm);
void FPU_ESC0_EA(Bitu func,PhysPt ea);
void FPU_ESC1_Normal(Bitu rm);
void FPU_ESC1_EA(Bitu func,PhysPt ea);
void FPU_ESC2_Normal(Bitu rm);
void FPU_ESC2_EA(Bitu func,PhysPt ea);
void FPU_ESC3_Normal(Bitu rm);
void FPU_ESC3_EA(Bitu func,PhysPt ea);
void FPU_ESC4_Normal(Bitu rm);
void FPU_ESC4_EA(Bitu func,PhysPt ea);
void FPU_ESC5_Normal(Bitu rm);
void FPU_ESC5_EA(Bitu func,PhysPt ea);
void FPU_ESC6_Normal(Bitu rm);
void FPU_ESC6_EA(Bitu func,PhysPt ea);
void FPU_ESC7_Normal(Bitu rm);
void FPU_ESC7_EA(Bitu func,PhysPt ea);
typedef union {
double d;
#ifndef WORDS_BIGENDIAN
struct {
uint32_t lower;
int32_t upper;
} l;
#else
struct {
int32_t upper;
uint32_t lower;
} l;
#endif
int64_t ll;
} FPU_Reg;
typedef struct {
uint32_t m1;
uint32_t m2;
uint16_t m3;
uint16_t d1;
uint32_t d2;
} FPU_P_Reg;
enum FPU_Tag {
TAG_Valid = 0,
TAG_Zero = 1,
TAG_Weird = 2,
TAG_Empty = 3
};
enum FPU_Round {
ROUND_Nearest = 0,
ROUND_Down = 1,
ROUND_Up = 2,
ROUND_Chop = 3
};
typedef struct FPU_rec {
FPU_Reg regs[9];
FPU_P_Reg p_regs[9];
FPU_Tag tags[9];
uint16_t cw,cw_mask_all;
uint16_t sw;
uint32_t top;
FPU_Round round;
} FPU_rec;
#define L2E 1.4426950408889634
#define L2T 3.3219280948873623
#define LN2 0.69314718055994531
#define LG2 0.3010299956639812
extern FPU_rec fpu;
#define TOP fpu.top
#define STV(i) ( (fpu.top+ (i) ) & 7 )
uint16_t FPU_GetTag(void);
void FPU_FLDCW(PhysPt addr);
static inline void FPU_SetTag(uint16_t tag){
for(Bitu i=0;i<8;i++)
fpu.tags[i] = static_cast<FPU_Tag>((tag >>(2*i))&3);
}
static inline void FPU_SetCW(Bitu word){
fpu.cw = (uint16_t)word;
fpu.cw_mask_all = (uint16_t)(word | 0x3f);
fpu.round = (FPU_Round)((word >> 10) & 3);
}
static inline Bitu FPU_GET_TOP(void) {
return (fpu.sw & 0x3800)>>11;
}
static inline void FPU_SET_TOP(Bitu val){
fpu.sw &= ~0x3800;
fpu.sw |= (val&7)<<11;
}
static inline void FPU_SET_C0(Bitu C){
fpu.sw &= ~0x0100;
if(C) fpu.sw |= 0x0100;
}
static inline void FPU_SET_C1(Bitu C){
fpu.sw &= ~0x0200;
if(C) fpu.sw |= 0x0200;
}
static inline void FPU_SET_C2(Bitu C){
fpu.sw &= ~0x0400;
if(C) fpu.sw |= 0x0400;
}
static inline void FPU_SET_C3(Bitu C){
fpu.sw &= ~0x4000;
if(C) fpu.sw |= 0x4000;
}
static inline void FPU_LOG_WARN(unsigned tree, bool ea, uintptr_t group, uintptr_t sub)
{
LOG(LOG_FPU, LOG_WARN)("ESC %u%s: Unhandled group %" PRIuPTR " subfunction %" PRIuPTR,
tree, ea ? " EA" : "", group, sub);
}
#define DB_FPU_STACK_CHECK_NONE 0
#define DB_FPU_STACK_CHECK_LOG 1
#define DB_FPU_STACK_CHECK_EXIT 2
//NONE is 0.74 behavior: not care about stack overflow/underflow
//Overflow is always logged/exited on.
//Underflow can be controlled with by this.
//LOG is giving a message when encountered
//EXIT is to hard exit.
//Currently pop is ignored in release mode and overflow is exit.
//in debug mode: pop will log and overflow is exit.
#if C_DEBUG
#define DB_FPU_STACK_CHECK_POP DB_FPU_STACK_CHECK_LOG
#define DB_FPU_STACK_CHECK_PUSH DB_FPU_STACK_CHECK_EXIT
#else
#define DB_FPU_STACK_CHECK_POP DB_FPU_STACK_CHECK_NONE
#define DB_FPU_STACK_CHECK_PUSH DB_FPU_STACK_CHECK_EXIT
#endif
#endif
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