mirror of
https://github.com/ksherlock/mpw.git
synced 2024-12-27 18:30:44 +00:00
391 lines
11 KiB
C
391 lines
11 KiB
C
/* @(#) $Id: CpuModule_InternalState.c,v 1.9 2012/08/12 16:51:02 peschau Exp $ */
|
|
/*=========================================================================*/
|
|
/* Fellow */
|
|
/* 68000 internal state */
|
|
/* */
|
|
/* Author: Petter Schau */
|
|
/* */
|
|
/* Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc. */
|
|
/* */
|
|
/* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
/*=========================================================================*/
|
|
#include "defs.h"
|
|
#include "CpuModule.h"
|
|
#include "fellow.h"
|
|
#include "fmem.h"
|
|
#include "CpuModule_Internal.h"
|
|
|
|
/* M68k registers */
|
|
static ULO cpu_regs[2][8]; /* 0 - data, 1 - address */
|
|
static ULO cpu_pc;
|
|
static ULO cpu_usp;
|
|
static ULO cpu_ssp;
|
|
static ULO cpu_msp;
|
|
static ULO cpu_sfc;
|
|
static ULO cpu_dfc;
|
|
ULO cpu_sr; // Not static because flags calculation use it extensively
|
|
static ULO cpu_vbr;
|
|
static UWO cpu_prefetch_word;
|
|
static ULO cpu_cacr;
|
|
static ULO cpu_caar;
|
|
|
|
/* Irq management */
|
|
static BOOLE cpu_raise_irq;
|
|
static ULO cpu_irq_level;
|
|
static ULO cpu_irq_address;
|
|
|
|
/* Reset values */
|
|
static ULO cpu_initial_pc;
|
|
static ULO cpu_initial_sp;
|
|
|
|
/* Flag set if CPU is stopped */
|
|
static BOOLE cpu_stop;
|
|
|
|
/* The current CPU model */
|
|
static ULO cpu_model_major = -1;
|
|
static ULO cpu_model_minor;
|
|
static UBY cpu_model_mask;
|
|
|
|
/* For exception handling */
|
|
#ifdef CPU_INSTRUCTION_LOGGING
|
|
|
|
static UWO cpu_current_opcode;
|
|
|
|
#endif
|
|
|
|
static ULO cpu_original_pc;
|
|
|
|
/* Number of cycles taken by the last intstruction */
|
|
static ULO cpu_instruction_time;
|
|
|
|
/* Getters and setters */
|
|
|
|
void cpuSetDReg(ULO i, ULO value) {cpu_regs[0][i] = value;}
|
|
ULO cpuGetDReg(ULO i) {return cpu_regs[0][i];}
|
|
|
|
void cpuSetAReg(ULO i, ULO value) {cpu_regs[1][i] = value;}
|
|
ULO cpuGetAReg(ULO i) {return cpu_regs[1][i];}
|
|
|
|
void cpuSetReg(ULO da, ULO i, ULO value) {cpu_regs[da][i] = value;}
|
|
ULO cpuGetReg(ULO da, ULO i) {return cpu_regs[da][i];}
|
|
|
|
/// <summary>
|
|
/// Get the supervisor bit from sr.
|
|
/// </summary>
|
|
BOOLE cpuGetFlagSupervisor(void)
|
|
{
|
|
return cpu_sr & 0x2000;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Get the master/irq state bit from sr.
|
|
/// </summary>
|
|
BOOLE cpuGetFlagMaster(void)
|
|
{
|
|
return cpu_sr & 0x1000;
|
|
}
|
|
|
|
void cpuSetUspDirect(ULO usp) {cpu_usp = usp;}
|
|
ULO cpuGetUspDirect(void) {return cpu_usp;}
|
|
ULO cpuGetUspAutoMap(void) {return (cpuGetFlagSupervisor()) ? cpuGetUspDirect() : cpuGetAReg(7);}
|
|
|
|
void cpuSetSspDirect(ULO ssp) {cpu_ssp = ssp;}
|
|
ULO cpuGetSspDirect(void) {return cpu_ssp;}
|
|
ULO cpuGetSspAutoMap(void) {return (cpuGetFlagSupervisor()) ? cpuGetAReg(7) : cpuGetSspDirect();}
|
|
|
|
void cpuSetMspDirect(ULO msp) {cpu_msp = msp;}
|
|
ULO cpuGetMspDirect(void) {return cpu_msp;}
|
|
|
|
/// <summary>
|
|
/// Returns the master stack pointer.
|
|
/// </summary>
|
|
ULO cpuGetMspAutoMap(void)
|
|
{
|
|
if (cpuGetFlagSupervisor() && cpuGetFlagMaster())
|
|
{
|
|
return cpuGetAReg(7);
|
|
}
|
|
return cpuGetMspDirect();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sets the master stack pointer.
|
|
/// </summary>
|
|
void cpuSetMspAutoMap(ULO new_msp)
|
|
{
|
|
if (cpuGetFlagSupervisor() && cpuGetFlagMaster())
|
|
{
|
|
cpuSetAReg(7, new_msp);
|
|
}
|
|
else
|
|
{
|
|
cpuSetMspDirect(new_msp);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the interrupt stack pointer. ssp is used as isp.
|
|
/// </summary>
|
|
ULO cpuGetIspAutoMap(void)
|
|
{
|
|
if (cpuGetFlagSupervisor() && !cpuGetFlagMaster())
|
|
{
|
|
return cpuGetAReg(7);
|
|
}
|
|
return cpuGetSspDirect();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sets the interrupt stack pointer. ssp is used as isp.
|
|
/// </summary>
|
|
void cpuSetIspAutoMap(ULO new_isp)
|
|
{
|
|
if (cpuGetFlagSupervisor() && !cpuGetFlagMaster())
|
|
{
|
|
cpuSetAReg(7, new_isp);
|
|
}
|
|
else
|
|
{
|
|
cpuSetSspDirect(new_isp);
|
|
}
|
|
}
|
|
|
|
void cpuSetPC(ULO address) {cpu_pc = address;}
|
|
ULO cpuGetPC(void) {return cpu_pc;}
|
|
|
|
void cpuSetStop(BOOLE stop) {cpu_stop = stop;}
|
|
BOOLE cpuGetStop(void) {return cpu_stop;}
|
|
|
|
void cpuSetVbr(ULO vbr) {cpu_vbr = vbr;}
|
|
ULO cpuGetVbr(void) {return cpu_vbr;}
|
|
|
|
void cpuSetSfc(ULO sfc) {cpu_sfc = sfc;}
|
|
ULO cpuGetSfc(void) {return cpu_sfc;}
|
|
|
|
void cpuSetDfc(ULO dfc) {cpu_dfc = dfc;}
|
|
ULO cpuGetDfc(void) {return cpu_dfc;}
|
|
|
|
void cpuSetCacr(ULO cacr) {cpu_cacr = cacr;}
|
|
ULO cpuGetCacr(void) {return cpu_cacr;}
|
|
|
|
void cpuSetCaar(ULO caar) {cpu_caar = caar;}
|
|
ULO cpuGetCaar(void) {return cpu_caar;}
|
|
|
|
void cpuSetSR(ULO sr) {cpu_sr = sr;}
|
|
ULO cpuGetSR(void) {return cpu_sr;}
|
|
|
|
void cpuSetIrqLevel(ULO irq_level) {cpu_irq_level = irq_level;}
|
|
ULO cpuGetIrqLevel(void) {return cpu_irq_level;}
|
|
|
|
void cpuSetIrqAddress(ULO irq_address) {cpu_irq_address = irq_address;}
|
|
ULO cpuGetIrqAddress(void) {return cpu_irq_address;}
|
|
|
|
void cpuSetInstructionTime(ULO cycles) {cpu_instruction_time = cycles;}
|
|
ULO cpuGetInstructionTime(void) {return cpu_instruction_time;}
|
|
|
|
void cpuSetOriginalPC(ULO pc) {cpu_original_pc = pc;}
|
|
ULO cpuGetOriginalPC(void) {return cpu_original_pc;}
|
|
|
|
#ifdef CPU_INSTRUCTION_LOGGING
|
|
|
|
void cpuSetCurrentOpcode(UWO opcode) {cpu_current_opcode = opcode;}
|
|
UWO cpuGetCurrentOpcode(void) {return cpu_current_opcode;}
|
|
|
|
#endif
|
|
|
|
void cpuSetRaiseInterrupt(BOOLE raise_irq) {cpu_raise_irq = raise_irq;}
|
|
BOOLE cpuGetRaiseInterrupt(void) {return cpu_raise_irq;}
|
|
|
|
void cpuSetInitialPC(ULO pc) {cpu_initial_pc = pc;}
|
|
ULO cpuGetInitialPC(void) {return cpu_initial_pc;}
|
|
|
|
void cpuSetInitialSP(ULO sp) {cpu_initial_sp = sp;}
|
|
ULO cpuGetInitialSP(void) {return cpu_initial_sp;}
|
|
|
|
void cpuSetModelMask(UBY model_mask) {cpu_model_mask = model_mask;}
|
|
UBY cpuGetModelMask(void) {return cpu_model_mask;}
|
|
|
|
ULO cpuGetModelMajor(void) {return cpu_model_major;}
|
|
ULO cpuGetModelMinor(void) {return cpu_model_minor;}
|
|
|
|
static void cpuCalculateModelMask(void)
|
|
{
|
|
switch (cpuGetModelMajor())
|
|
{
|
|
case 0:
|
|
cpuSetModelMask(0x01);
|
|
break;
|
|
case 1:
|
|
cpuSetModelMask(0x02);
|
|
break;
|
|
case 2:
|
|
cpuSetModelMask(0x04);
|
|
break;
|
|
case 3:
|
|
cpuSetModelMask(0x08);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void cpuSetModel(ULO major, ULO minor)
|
|
{
|
|
BOOLE makeOpcodeTable = (cpu_model_major != major);
|
|
cpu_model_major = major;
|
|
cpu_model_minor = minor;
|
|
cpuCalculateModelMask();
|
|
cpuStackFrameInit();
|
|
if (makeOpcodeTable) cpuMakeOpcodeTableForModel();
|
|
}
|
|
|
|
void cpuSetDRegWord(ULO regno, UWO val) {*((WOR*)&cpu_regs[0][regno]) = val;}
|
|
void cpuSetDRegByte(ULO regno, UBY val) {*((UBY*)&cpu_regs[0][regno]) = val;}
|
|
UWO cpuGetRegWord(ULO i, ULO regno) {return (UWO)cpu_regs[i][regno];}
|
|
|
|
UWO cpuGetDRegWord(ULO regno) {return (UWO)cpu_regs[0][regno];}
|
|
UBY cpuGetDRegByte(ULO regno) {return (UBY)cpu_regs[0][regno];}
|
|
|
|
ULO cpuGetDRegWordSignExtLong(ULO regno) {return cpuSignExtWordToLong(cpuGetDRegWord(regno));}
|
|
UWO cpuGetDRegByteSignExtWord(ULO regno) {return cpuSignExtByteToWord(cpuGetDRegByte(regno));}
|
|
ULO cpuGetDRegByteSignExtLong(ULO regno) {return cpuSignExtByteToLong(cpuGetDRegByte(regno));}
|
|
|
|
UWO cpuGetARegWord(ULO regno) {return (UWO)cpu_regs[1][regno];}
|
|
UBY cpuGetARegByte(ULO regno) {return (UBY)cpu_regs[1][regno];}
|
|
|
|
typedef UWO (*cpuGetWordFunc)(void);
|
|
typedef ULO (*cpuGetLongFunc)(void);
|
|
|
|
static UWO cpuGetNextWordInternal(void)
|
|
{
|
|
UWO data = memoryReadWord(cpuGetPC() + 2);
|
|
return data;
|
|
}
|
|
|
|
static ULO cpuGetNextLongInternal(void)
|
|
{
|
|
ULO data = memoryReadLong(cpuGetPC() + 2);
|
|
return data;
|
|
}
|
|
|
|
UWO cpuGetNextWord(void)
|
|
{
|
|
UWO tmp = cpu_prefetch_word;
|
|
cpu_prefetch_word = cpuGetNextWordInternal();
|
|
cpuSetPC(cpuGetPC() + 2);
|
|
return tmp;
|
|
}
|
|
|
|
ULO cpuGetNextWordSignExt(void)
|
|
{
|
|
return cpuSignExtWordToLong(cpuGetNextWord());
|
|
}
|
|
|
|
ULO cpuGetNextLong(void)
|
|
{
|
|
ULO tmp = cpu_prefetch_word << 16;
|
|
ULO data = cpuGetNextLongInternal();
|
|
cpu_prefetch_word = (UWO) data;
|
|
cpuSetPC(cpuGetPC() + 4);
|
|
return tmp | (data >> 16);
|
|
}
|
|
|
|
void cpuInitializePrefetch(void)
|
|
{
|
|
cpu_prefetch_word = memoryReadWord(cpuGetPC());
|
|
}
|
|
|
|
void cpuClearPrefetch(void)
|
|
{
|
|
cpu_prefetch_word = 0;
|
|
}
|
|
|
|
void cpuSkipNextWord(void)
|
|
{
|
|
cpuSetPC(cpuGetPC() + 2);
|
|
cpuInitializePrefetch();
|
|
}
|
|
|
|
void cpuSkipNextLong(void)
|
|
{
|
|
cpuSetPC(cpuGetPC() + 4);
|
|
cpuInitializePrefetch();
|
|
}
|
|
|
|
void cpuInitializeFromNewPC(ULO new_pc)
|
|
{
|
|
cpuSetPC(new_pc);
|
|
cpuInitializePrefetch();
|
|
}
|
|
|
|
void cpuSaveState(FILE *F)
|
|
{
|
|
ULO i, j;
|
|
|
|
fwrite(&cpu_model_major, sizeof(cpu_model_major), 1, F);
|
|
fwrite(&cpu_model_minor, sizeof(cpu_model_minor), 1, F);
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
for (j = 0; j < 7; j++)
|
|
{
|
|
fwrite(&cpu_regs[i][j], sizeof(cpu_regs[i][j]), 1, F);
|
|
}
|
|
}
|
|
fwrite(&cpu_pc, sizeof(cpu_pc), 1, F);
|
|
fwrite(&cpu_usp, sizeof(cpu_usp), 1, F);
|
|
fwrite(&cpu_ssp, sizeof(cpu_ssp), 1, F);
|
|
fwrite(&cpu_msp, sizeof(cpu_msp), 1, F);
|
|
fwrite(&cpu_sfc, sizeof(cpu_sfc), 1, F);
|
|
fwrite(&cpu_dfc, sizeof(cpu_dfc), 1, F);
|
|
fwrite(&cpu_sr, sizeof(cpu_sr), 1, F);
|
|
fwrite(&cpu_prefetch_word, sizeof(cpu_prefetch_word), 1, F);
|
|
fwrite(&cpu_vbr, sizeof(cpu_vbr), 1, F);
|
|
fwrite(&cpu_cacr, sizeof(cpu_cacr), 1, F);
|
|
fwrite(&cpu_caar, sizeof(cpu_caar), 1, F);
|
|
fwrite(&cpu_irq_level, sizeof(cpu_irq_level), 1, F);
|
|
fwrite(&cpu_irq_address, sizeof(cpu_irq_address), 1, F);
|
|
fwrite(&cpu_initial_pc, sizeof(cpu_initial_pc), 1, F);
|
|
fwrite(&cpu_initial_sp, sizeof(cpu_initial_sp), 1, F);
|
|
}
|
|
|
|
void cpuLoadState(FILE *F)
|
|
{
|
|
ULO i, j;
|
|
|
|
fread(&cpu_model_major, sizeof(cpu_model_major), 1, F);
|
|
fread(&cpu_model_minor, sizeof(cpu_model_minor), 1, F);
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
for (j = 0; j < 7; j++)
|
|
{
|
|
fread(&cpu_regs[i][j], sizeof(cpu_regs[i][j]), 1, F);
|
|
}
|
|
}
|
|
fread(&cpu_pc, sizeof(cpu_pc), 1, F);
|
|
fread(&cpu_usp, sizeof(cpu_usp), 1, F);
|
|
fread(&cpu_ssp, sizeof(cpu_ssp), 1, F);
|
|
fread(&cpu_msp, sizeof(cpu_msp), 1, F);
|
|
fread(&cpu_sfc, sizeof(cpu_sfc), 1, F);
|
|
fread(&cpu_dfc, sizeof(cpu_dfc), 1, F);
|
|
fread(&cpu_sr, sizeof(cpu_sr), 1, F);
|
|
fread(&cpu_prefetch_word, sizeof(cpu_prefetch_word), 1, F);
|
|
fread(&cpu_vbr, sizeof(cpu_vbr), 1, F);
|
|
fread(&cpu_cacr, sizeof(cpu_cacr), 1, F);
|
|
fread(&cpu_caar, sizeof(cpu_caar), 1, F);
|
|
fread(&cpu_irq_level, sizeof(cpu_irq_level), 1, F);
|
|
fread(&cpu_irq_address, sizeof(cpu_irq_address), 1, F);
|
|
fread(&cpu_initial_pc, sizeof(cpu_initial_pc), 1, F);
|
|
fread(&cpu_initial_sp, sizeof(cpu_initial_sp), 1, F);
|
|
cpuSetModel(cpu_model_major, cpu_model_minor); // Recalculates stack frames etc.
|
|
}
|