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pcjs/modules/pc8080/lib/cpuops.js
Jeff Parsons 978d59efbf More 8080 opcodes
2016-04-22 07:06:05 -07:00

628 lines
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/**
* @fileoverview Implements PC8080 opcode handlers.
* @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
* @version 1.0
* Created 2016-Apr-20
*
* Copyright © 2012-2016 Jeff Parsons <Jeff@pcjs.org>
*
* This file is part of PCjs, which is part of the JavaScript Machines Project (aka JSMachines)
* at <http://jsmachines.net/> and <http://pcjs.org/>.
*
* PCjs 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 3
* of the License, or (at your option) any later version.
*
* PCjs 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 PCjs. If not,
* see <http://www.gnu.org/licenses/gpl.html>.
*
* You are required to include the above copyright notice in every source code file of every
* copy or modified version of this work, and to display that copyright notice on every screen
* that loads or runs any version of this software (see Computer.COPYRIGHT).
*
* Some PCjs files also attempt to load external resource files, such as character-image files,
* ROM files, and disk image files. Those external resource files are not considered part of the
* PCjs program for purposes of the GNU General Public License, and the author does not claim
* any copyright as to their contents.
*/
"use strict";
if (NODE) {
var str = require("../../shared/lib/strlib");
var Messages = require("./messages");
var CPUDef = require("./CPUDef");
}
/**
* op=0x00 (NOP)
*
* @this {CPUSim}
*/
CPUDef.opNOP = function()
{
this.nStepCycles -= 4;
};
/**
* op=0x01 (LXI B,d16)
*
* @this {CPUSim}
*/
CPUDef.opLXIB = function()
{
this.setBC(this.getPCWord());
this.nStepCycles -= 10;
};
/**
* op=0x02 (STAX B)
*
* @this {CPUSim}
*/
CPUDef.opSTAXB = function()
{
this.setByte(this.getBC(), this.regA);
this.nStepCycles -= 7;
};
/**
* op=0x03 (INX B)
*
* @this {CPUSim}
*/
CPUDef.opINXB = function()
{
this.setBC(this.getBC() + 1);
this.nStepCycles -= 5;
};
/**
* op=0x04 (INR B)
*
* @this {CPUSim}
*/
CPUDef.opINRB = function()
{
this.regB = this.incByte(this.regB);
this.nStepCycles -= 5;
};
/**
* op=0x05 (DCR B)
*
* @this {CPUSim}
*/
CPUDef.opDCRB = function()
{
this.regB = this.decByte(this.regB);
this.nStepCycles -= 5;
};
/**
* op=0x06 (MVI B,d8)
*
* @this {CPUSim}
*/
CPUDef.opMVIB = function()
{
this.regB = this.getPCByte();
this.nStepCycles -= 7;
};
/**
* op=0x07 (RLC)
*
* @this {CPUSim}
*/
CPUDef.opRLC = function()
{
var carry = this.regA << 1;
this.regA = (carry & 0xff) | (carry >> 8);
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | (carry & 0x100);
this.nStepCycles -= 4;
};
/**
* op=0x09 (DAD B)
*
* @this {CPUSim}
*/
CPUDef.opDADB = function()
{
var w;
this.setHL(w = this.getHL() + this.getBC());
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | ((w >> 8) & 0x100);
this.nStepCycles -= 10;
};
/**
* op=0x0A (LDAX B)
*
* @this {CPUSim}
*/
CPUDef.opLDAXB = function()
{
this.regA = this.getByte(this.getBC());
this.nStepCycles -= 7;
};
/**
* op=0x0B (DCX B)
*
* @this {CPUSim}
*/
CPUDef.opDCXB = function()
{
this.setBC(this.getBC() - 1);
this.nStepCycles -= 5;
};
/**
* op=0x0C (INR C)
*
* @this {CPUSim}
*/
CPUDef.opINRC = function()
{
this.regC = this.incByte(this.regC);
this.nStepCycles -= 5;
};
/**
* op=0x0D (DCR C)
*
* @this {CPUSim}
*/
CPUDef.opDCRC = function()
{
this.regC = this.decByte(this.regC);
this.nStepCycles -= 5;
};
/**
* op=0x0E (MVI C,d8)
*
* @this {CPUSim}
*/
CPUDef.opMVIC = function()
{
this.regC = this.getPCByte();
this.nStepCycles -= 7;
};
/**
* op=0x0F (RRC)
*
* @this {CPUSim}
*/
CPUDef.opRRC = function()
{
var carry = (this.regA << 8) & 0x100;
this.regA = (carry | this.regA) >> 1;
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | carry;
this.nStepCycles -= 4;
};
/**
* op=0x11 (LXI D,d16)
*
* @this {CPUSim}
*/
CPUDef.opLXID = function()
{
this.setDE(this.getPCWord());
this.nStepCycles -= 10;
};
/**
* op=0x12 (STAX D)
*
* @this {CPUSim}
*/
CPUDef.opSTAXD = function()
{
this.setByte(this.getDE(), this.regA);
this.nStepCycles -= 7;
};
/**
* op=0x13 (INX D)
*
* @this {CPUSim}
*/
CPUDef.opINXD = function()
{
this.setDE(this.getDE() + 1);
this.nStepCycles -= 5;
};
/**
* op=0x14 (INR D)
*
* @this {CPUSim}
*/
CPUDef.opINRD = function()
{
this.regD = this.incByte(this.regD);
this.nStepCycles -= 5;
};
/**
* op=0x15 (DCR D)
*
* @this {CPUSim}
*/
CPUDef.opDCRD = function()
{
this.regD = this.decByte(this.regD);
this.nStepCycles -= 5;
};
/**
* op=0x16 (MVI D,d8)
*
* @this {CPUSim}
*/
CPUDef.opMVID = function()
{
this.regD = this.getPCByte();
this.nStepCycles -= 7;
};
/**
* op=0x17 (RAL)
*
* @this {CPUSim}
*/
CPUDef.opRAL = function()
{
var carry = this.regA << 1;
this.regA = (carry & 0xff) | (this.resultZeroCarry >> 8);
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | (carry & 0x100);
this.nStepCycles -= 4;
};
/**
* op=0x19 (DAD D)
*
* @this {CPUSim}
*/
CPUDef.opDADD = function()
{
var w;
this.setHL(w = this.getHL() + this.getDE());
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | ((w >> 8) & 0x100);
this.nStepCycles -= 10;
};
/**
* op=0x1A (LDAX D)
*
* @this {CPUSim}
*/
CPUDef.opLDAXD = function()
{
this.regA = this.getByte(this.getDE());
this.nStepCycles -= 7;
};
/**
* op=0x1B (DCX D)
*
* @this {CPUSim}
*/
CPUDef.opDCXD = function()
{
this.setDE(this.getDE() - 1);
this.nStepCycles -= 5;
};
/**
* op=0x1C (INR E)
*
* @this {CPUSim}
*/
CPUDef.opINRE = function()
{
this.regE = this.incByte(this.regE);
this.nStepCycles -= 5;
};
/**
* op=0x1D (DCR E)
*
* @this {CPUSim}
*/
CPUDef.opDCRE = function()
{
this.regE = this.decByte(this.regE);
this.nStepCycles -= 5;
};
/**
* op=0x1E (MVI E,d8)
*
* @this {CPUSim}
*/
CPUDef.opMVIE = function()
{
this.regE = this.getPCByte();
this.nStepCycles -= 7;
};
/**
* op=0x1F (RAR)
*
* @this {CPUSim}
*/
CPUDef.opRAR = function()
{
var carry = (this.regA << 8) & 0x100;
this.regA = ((this.resultZeroCarry & 0x100) | this.regA) >> 1;
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | carry;
this.nStepCycles -= 4;
};
/**
* op=0x21 (LXI H,d16)
*
* @this {CPUSim}
*/
CPUDef.opLXIH = function()
{
this.setHL(this.getPCWord());
this.nStepCycles -= 10;
};
/**
* op=0x22 (SHLD a16)
*
* @this {CPUSim}
*/
CPUDef.opSHLD = function()
{
this.setWord(this.getPCWord(), this.getHL());
this.nStepCycles -= 16;
};
/**
* op=0x23 (INX H)
*
* @this {CPUSim}
*/
CPUDef.opINXH = function()
{
this.setHL(this.getHL() + 1);
this.nStepCycles -= 5;
};
/**
* op=0x24 (INR H)
*
* @this {CPUSim}
*/
CPUDef.opINRH = function()
{
this.regH = this.incByte(this.regH);
this.nStepCycles -= 5;
};
/**
* op=0x25 (DCR H)
*
* @this {CPUSim}
*/
CPUDef.opDCRH = function()
{
this.regH = this.decByte(this.regH);
this.nStepCycles -= 5;
};
/**
* op=0x26 (MVI H,d8)
*
* @this {CPUSim}
*/
CPUDef.opMVIH = function()
{
this.regH = this.getPCByte();
this.nStepCycles -= 7;
};
/**
* op=0x27 (DAA)
*
* @this {CPUSim}
*/
CPUDef.opDAA = function()
{
var acc = this.regA;
var fCarry = !!this.getCF();
var fAuxCarry = !!this.getAF();
if ((acc & 0xf) > 9 || fAuxCarry) {
acc += 0x6;
fAuxCarry = true;
} else {
fAuxCarry = false;
}
if (acc >= 0xa0 || fCarry) {
acc += 0x60;
fCarry = true;
} else {
fCarry = false;
}
this.resultZeroCarry = this.resultParitySign = this.regA = (acc & 0xff);
this.updateCF(fCarry);
this.updateAF(fAuxCarry);
this.nStepCycles -= 4;
};
/**
* op=0x29 (DAD H)
*
* @this {CPUSim}
*/
CPUDef.opDADH = function()
{
var w;
this.setHL(w = this.getHL() + this.getHL());
this.resultZeroCarry = (this.resultZeroCarry & 0xff) | ((w >> 8) & 0x100);
this.nStepCycles -= 10;
};
/**
* op=0x2A (LHLD a16)
*
* @this {CPUSim}
*/
CPUDef.opLHLD = function()
{
this.setHL(this.getWord(this.getPCWord()));
this.nStepCycles -= 16;
};
/**
* op=0x2B (DCX H)
*
* @this {CPUSim}
*/
CPUDef.opDCXH = function()
{
this.setHL(this.getHL() - 1);
this.nStepCycles -= 5;
};
/**
* op=0x2C (INR L)
*
* @this {CPUSim}
*/
CPUDef.opINRL = function()
{
this.regL = this.incByte(this.regL);
this.nStepCycles -= 5;
};
/**
* op=0x2D (DCR L)
*
* @this {CPUSim}
*/
CPUDef.opDCRL = function()
{
this.regL = this.decByte(this.regL);
this.nStepCycles -= 5;
};
/**
* op=0x2E (MVI L,d8)
*
* @this {CPUSim}
*/
CPUDef.opMVIL = function()
{
this.regL = this.getPCByte();
this.nStepCycles -= 7;
};
/**
* op=0x2F (CMA)
*
* @this {CPUSim}
*/
CPUDef.opCMA = function()
{
this.regA = ~this.regA & 0xff;
this.nStepCycles -= 4;
};
/**
* opTBD()
*
* @this {CPUSim}
*/
CPUDef.opTBD = function()
{
this.setPC(this.getPC() - 1);
this.printMessage("unimplemented opcode", true);
this.stopCPU();
};
/*
* This 256-entry array of opcode functions is at the heart of the CPU engine: stepCPU(n).
*
* It might be worth trying a switch() statement instead, to see how the performance compares,
* but I suspect that would vary quite a bit across JavaScript engines; for now, I'm putting my
* money on array lookup.
*/
CPUDef.aOps = [
/* 0x00-0x03 */ CPUDef.opNOP, CPUDef.opLXIB, CPUDef.opSTAXB, CPUDef.opINXB,
/* 0x04-0x07 */ CPUDef.opINRB, CPUDef.opDCRB, CPUDef.opMVIB, CPUDef.opRLC,
/* 0x08-0x0B */ CPUDef.opNOP, CPUDef.opDADB, CPUDef.opLDAXB, CPUDef.opDCXB,
/* 0x0C-0x0F */ CPUDef.opINRC, CPUDef.opDCRC, CPUDef.opMVIC, CPUDef.opRRC,
/* 0x10-0x13 */ CPUDef.opNOP, CPUDef.opLXID, CPUDef.opSTAXD, CPUDef.opINXD,
/* 0x14-0x17 */ CPUDef.opINRD, CPUDef.opDCRD, CPUDef.opMVID, CPUDef.opRAL,
/* 0x18-0x1B */ CPUDef.opNOP, CPUDef.opDADD, CPUDef.opLDAXD, CPUDef.opDCXD,
/* 0x1C-0x1F */ CPUDef.opINRE, CPUDef.opDCRE, CPUDef.opMVIE, CPUDef.opRAR,
/* 0x20-0x23 */ CPUDef.opNOP, CPUDef.opLXIH, CPUDef.opSHLD, CPUDef.opINXH,
/* 0x24-0x27 */ CPUDef.opINRH, CPUDef.opDCRH, CPUDef.opMVIH, CPUDef.opDAA,
/* 0x28-0x2B */ CPUDef.opNOP, CPUDef.opDADH, CPUDef.opLHLD, CPUDef.opDCXH,
/* 0x2C-0x2F */ CPUDef.opINRL, CPUDef.opDCRL, CPUDef.opMVIL, CPUDef.opCMA,
/* 0x30-0x33 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x34-0x37 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x38-0x3B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x3C-0x3F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x40-0x43 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x44-0x47 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x48-0x4B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x4C-0x4F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x50-0x53 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x54-0x57 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x58-0x5B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x5C-0x5F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x60-0x63 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x64-0x67 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x68-0x6B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x6C-0x6F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x70-0x73 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x74-0x77 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x78-0x7B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x7C-0x7F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x80-0x83 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x84-0x87 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x88-0x8B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x8C-0x8F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x90-0x93 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x94-0x97 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x98-0x9B */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0x9C-0x9F */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xA0-0xA3 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xA4-0xA7 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xA8-0xAB */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xAC-0xAF */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xB0-0xB3 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xB4-0xB7 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xB8-0xBB */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xBC-0xBF */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xC0-0xC3 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xC4-0xC7 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xC8-0xCB */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xCC-0xCF */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xD0-0xD3 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xD4-0xD7 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xD8-0xDB */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xDC-0xDF */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xE0-0xE3 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xE4-0xE7 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xE8-0xEB */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xEC-0xEF */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xF0-0xF3 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xF4-0xF7 */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xF8-0xFB */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD,
/* 0xFC-0xFF */ CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD, CPUDef.opTBD
];
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