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debugger.js
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debugger.js
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/**
* jsSMS - A Sega Master System/Game Gear emulator in JavaScript
* Copyright (C) 2012 Guillaume Marty (https://github.com/gmarty)
* Based on JavaGear Copyright (c) 2002-2008 Chris White
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
'use strict';
/**
* A class extending JSSMS.Z80 to debug the internal cpu logic.
*
* @constructor
* @extends {JSSMS.Z80}
*/
JSSMS.Debugger = function() {
// Nothing here -- never executed.
};
JSSMS.Debugger.prototype = {
// Hold the ROM instructions parsed.
instructions: [],
/**
* Reset the properties to their default values.
* Called whenever a rom is loaded.
*/
resetDebug: function() {
this.instructions = [];
this.main.ui.updateStatus('Parsing instructions...');
this.parseInstructions();
this.main.ui.updateStatus('Instructions parsed');
},
/**
* Parse the rom instructions.
*/
parseInstructions: function() {
JSSMS.Utils.console.time('Instructions parsing');
var romSize = PAGE_SIZE * this.rom.length;
var instruction;
var currentAddress;
var i = 0;
var addresses = []; //Array(romSize);
var entryPoints = [
0x00, // Add program entry point to the list of addresses to visit.
0x38, // RST 38h and Interrupt.
0x66 // Set by NMI.
];
entryPoints.forEach(function(entryPoint) {
addresses.push(entryPoint);
});
while (addresses.length) {
currentAddress = addresses.shift();
if (this.instructions[currentAddress]) {
continue;
}
if (currentAddress >= romSize || (currentAddress >> 10) >= 65) {
JSSMS.Utils.console.log('Invalid address', JSSMS.Utils.toHex(currentAddress));
continue;
}
// @todo Move to a separate function to allow adding code entry points later.
instruction = this.disassemble(currentAddress);
this.instructions[currentAddress] = instruction;
if (instruction.nextAddress != null) {
addresses.push(instruction.nextAddress);
}
if (instruction.target != null) {
addresses.push(instruction.target);
}
}
// Flag any instructions that are jump targets.
entryPoints.forEach(function(entryPoint) {
if (!this.instructions[entryPoint]) {
return;
}
this.instructions[entryPoint].isJumpTarget = true;
}, this);
for (; i < romSize; i++) {
if (!this.instructions[i]) {
continue;
}
// Comparing with null is important here as `0` is a valid address.
if (this.instructions[i].nextAddress != null && this.instructions[this.instructions[i].nextAddress]) {
this.instructions[this.instructions[i].nextAddress].jumpTargetNb++;
}
if (this.instructions[i].target != null) {
if (this.instructions[this.instructions[i].target]) {
this.instructions[this.instructions[i].target].isJumpTarget = true;
this.instructions[this.instructions[i].target].jumpTargetNb++;
} else {
JSSMS.Utils.console.log('Invalid target address', JSSMS.Utils.toHex(this.instructions[i].target));
}
}
}
JSSMS.Utils.console.timeEnd('Instructions parsing');
},
/**
* Write a dot file representation of parsed instructions to the console.
*
* @return {string} The content of a Dot file.
*/
writeGraphViz: function() {
JSSMS.Utils.console.time('DOT generation');
var tree = this.instructions;
var INDENT = ' ';
var content = ['digraph G {'];
for (var i = 0, length = tree.length; i < length; i++) {
if (!tree[i])
continue;
content.push(INDENT + i + ' [label="' + tree[i].label + '"];');
if (tree[i].target != null)
content.push(INDENT + i + ' -> ' + tree[i].target + ';');
if (tree[i].nextAddress != null)
content.push(INDENT + i + ' -> ' + tree[i].nextAddress + ';');
}
content.push('}');
content = content.join('\n');
// Inject entry point styling.
content = content.replace(/ 0 \[label="/, ' 0 [style=filled,color="#CC0000",label="');
JSSMS.Utils.console.timeEnd('DOT generation');
return content;
},
/**
* Return a string representing a JavaScript code for the ROM instructions.
* The format is a big switch unrolling the value of this.pc.
* The idea is to avoid using this.readMem() and this.readMemWord().
*
* @return {string} JavaScript code.
*/
writeJavaScript: function() {
JSSMS.Utils.console.time('JavaScript generation');
var tree = this.instructions;
var toHex = JSSMS.Utils.toHex;
var tstates = 0;
var prevAddress = 0;
var prevNextAddress = 0;
var breakNeeded = false;
// Memory pages
var pageBreakPoint = 0x0400;
var pageNumber = 0;
var i = 0, length = 0;
var code = [
'"": {',
'"": function() {',
'throw "Bad address: " + JSSMS.Utils.toHex(this.pc);'
];
for (i = 0, length = tree.length; i < length; i++) {
if (!tree[i])
continue;
// Break branches into several pages.
if (prevAddress <= pageBreakPoint && tree[i].address >= pageBreakPoint) {
code.push('this.pc = ' + toHex(tree[i].address) + ';');
code.push('}');
code.push('},');
code.push('' + pageNumber + ': {');
code.push('"": function() {');
code.push('throw "Bad address: " + JSSMS.Utils.toHex(this.pc);');
breakNeeded = true;
// Set next memory break point.
pageNumber++;
pageBreakPoint = pageNumber * PAGE_SIZE;
}
if (tree[i].isJumpTarget || prevNextAddress != tree[i].address || breakNeeded) {
insertTStates();
if (prevNextAddress && !breakNeeded) {
code.push('this.pc = ' + toHex(prevNextAddress) + ';');
}
code.push('},');
// `temp` is only used for variable declaration, not actually passed parameter.
code.push('' + toHex(tree[i].address) + ': function(temp, location) {');
//code.push('// Nb of instructions jumping here: ' + tree[i].jumpTargetNb);
}
//code.push('if (this.tstates <= 0) {this.pc = ' + toHex(tree[i].address) + '; if (this.eol()) return;}');
// Comment for debugging.
code.push('// ' + tree[i].label);
breakNeeded = tree[i].code.substr(-7) == 'return;';
// Decrement tstates.
tstates += getTotalTStates(tree[i].opcodes);
/*if (tstates >= this.main.cyclesPerLine) {
insertTStates();
code.push('if (this.tstates <= 0) {this.pc = ' + toHex(prevNextAddress) + '; return;}');
}*/
if (/return;/.test(tree[i].code) || /this\.tstates/.test(tree[i].code)) {
insertTStates();
}
// Instruction.
if (tree[i].code != '')
code.push(tree[i].code);
prevAddress = tree[i].address;
prevNextAddress = tree[i].nextAddress;
}
code.push('}'); // End of last branch
code.push('}'); // End of branches object (the comma is inserted in the template).
code = code.join('\n');
JSSMS.Utils.console.timeEnd('JavaScript generation');
return code;
function getTotalTStates(opcodes) {
var tstates = 0;
switch (opcodes[0]) {
case 0xCB:
tstates = OP_CB_STATES[opcodes[1]];
break;
case 0xDD:
case 0xFD:
if (opcodes.length == 2)
tstates = OP_DD_STATES[opcodes[1]];
else
tstates = OP_INDEX_CB_STATES[opcodes[2]];
break;
case 0xED:
tstates = OP_ED_STATES[opcodes[1]];
break;
default:
tstates = OP_STATES[opcodes[0]];
break;
}
return tstates;
}
function insertTStates() {
if (tstates)
code.push('this.tstates -= ' + toHex(tstates) + ';');
tstates = 0;
}
},
/**
* Returns the instruction associated to an opcode for debugging purposes
*
* @param {number} address
* @return {Object}
*/
disassemble: function(address) {
var toHex = JSSMS.Utils.toHex;
var opcode = this.readRom8bit(address);
var opcodesArray = [opcode];
var inst = 'Unknown Opcode';
var currAddr = address;
var target = null;
var code = 'throw "Unimplemented opcode ' + toHex(opcode) + '";';
var operand = '';
var location = 0;
address++;
var _inst = {};
switch (opcode) {
case 0x00:
inst = 'NOP';
code = '';
break;
case 0x01:
operand = toHex(this.readRom16bit(address));
inst = 'LD BC,' + operand;
code = 'this.setBC(' + operand + ');';
address += 2;
break;
case 0x02:
inst = 'LD (BC),A';
code = 'this.writeMem(this.getBC(), this.a);';
break;
case 0x03:
inst = 'INC BC';
code = 'this.incBC();';
break;
case 0x04:
inst = 'INC B';
code = 'this.b = this.inc8(this.b);';
break;
case 0x05:
inst = 'DEC B';
code = 'this.b = this.dec8(this.b);';
break;
case 0x06:
operand = toHex(this.readRom8bit(address));
inst = 'LD B,' + operand;
code = 'this.b = ' + operand + ';';
address++;
break;
case 0x07:
inst = 'RLCA';
code = 'this.rlca_a();';
break;
case 0x08:
inst = 'EX AF AF\'';
code = 'this.exAF();';
break;
case 0x09:
inst = 'ADD HL,BC';
code = 'this.setHL(this.add16(this.getHL(), this.getBC()));';
break;
case 0x0A:
inst = 'LD A,(BC)';
code = 'this.a = this.readMem(this.getBC());';
break;
case 0x0B:
inst = 'DEC BC';
code = 'this.decBC();';
break;
case 0x0C:
inst = 'INC C';
code = 'this.c = this.inc8(this.c);';
break;
case 0x0D:
inst = 'DEC C';
code = 'this.c = this.dec8(this.c);';
break;
case 0x0E:
operand = toHex(this.readRom8bit(address));
inst = 'LD C,' + operand;
code = 'this.c = ' + operand + ';';
address++;
break;
case 0x0F:
inst = 'RRCA';
code = 'this.rrca_a();';
break;
case 0x10:
target = address + this.signExtend(this.readRom8bit(address) + 1);
inst = 'DJNZ (' + toHex(target) + ')';
code = 'this.b = this.b - 0x01 & 0xFF;' +
'if (this.b != 0x00) {' +
'this.tstates -= 0x05;' +
'this.pc = ' + toHex(target) + ';' +
'return;' +
'}';
address++;
break;
case 0x11:
operand = toHex(this.readRom16bit(address));
inst = 'LD DE,' + operand;
code = 'this.setDE(' + operand + ');';
address += 2;
break;
case 0x12:
inst = 'LD (DE),A';
code = 'this.writeMem(this.getDE(), this.a);';
break;
case 0x13:
inst = 'INC DE';
code = 'this.incDE();';
break;
case 0x14:
inst = 'INC D';
code = 'this.d = this.inc8(this.d);';
break;
case 0x15:
inst = 'DEC D';
code = 'this.d = this.dec8(this.d);';
break;
case 0x16:
operand = toHex(this.readRom8bit(address));
inst = 'LD D,' + operand;
code = 'this.d = ' + operand + ';';
address++;
break;
case 0x17:
inst = 'RLA';
code = 'this.rla_a();';
break;
case 0x18:
target = address + this.signExtend(this.readRom8bit(address) + 1);
inst = 'JR (' + toHex(target) + ')';
code = 'this.pc = ' + toHex(target) + '; return;';
address = null;
break;
case 0x19:
inst = 'ADD HL,DE';
code = 'this.setHL(this.add16(this.getHL(), this.getDE()));';
break;
case 0x1A:
inst = 'LD A,(DE)';
code = 'this.a = this.readMem(this.getDE());';
break;
case 0x1B:
inst = 'DEC DE';
code = 'this.decDE();';
break;
case 0x1C:
inst = 'INC E';
code = 'this.e = this.inc8(this.e);';
break;
case 0x1D:
inst = 'DEC E';
code = 'this.e = this.dec8(this.e);';
break;
case 0x1E:
operand = toHex(this.readRom8bit(address));
inst = 'LD E,' + operand;
code = 'this.e = ' + operand + ';';
address++;
break;
case 0x1F:
inst = 'RRA';
code = 'this.rra_a();';
break;
case 0x20:
target = address + this.signExtend(this.readRom8bit(address) + 1);
inst = 'JR NZ,(' + toHex(target) + ')';
code = 'if (!((this.f & F_ZERO) != 0x00)) {' +
'this.tstates -= 0x05;' +
'this.pc = ' + toHex(target) + ';' +
'return;' +
'}';
address++;
break;
case 0x21:
operand = toHex(this.readRom16bit(address));
inst = 'LD HL,' + operand;
code = 'this.setHL(' + operand + ');';
address += 2;
break;
case 0x22:
location = this.readRom16bit(address);
operand = toHex(location);
inst = 'LD (' + operand + '),HL';
code = 'this.writeMem(' + operand + ', this.l);' +
'this.writeMem(' + toHex(location + 1) + ', this.h);';
address += 2;
break;
case 0x23:
inst = 'INC HL';
code = 'this.incHL();';
break;
case 0x24:
inst = 'INC H';
code = 'this.h = this.inc8(this.h);';
break;
case 0x25:
inst = 'DEC H';
code = 'this.h = this.dec8(this.h);';
break;
case 0x26:
operand = toHex(this.readRom8bit(address));
inst = 'LD H,' + operand;
code = 'this.h = ' + operand + ';';
address++;
break;
case 0x27:
inst = 'DAA';
code = 'this.daa();';
break;
case 0x28:
target = address + this.signExtend(this.readRom8bit(address) + 1);
inst = 'JR Z,(' + toHex(target) + ')';
code = 'if ((this.f & F_ZERO) != 0x00) {' +
'this.tstates -= 0x05;' +
'this.pc = ' + toHex(target) + ';' +
'return;' +
'}';
address++;
break;
case 0x29:
inst = 'ADD HL,HL';
code = 'this.setHL(this.add16(this.getHL(), this.getHL()));';
break;
case 0x2A:
operand = toHex(this.readRom16bit(address));
inst = 'LD HL,(' + operand + ')';
code = 'this.setHL(this.readMemWord(' + operand + '));';
address += 2;
break;
case 0x2B:
inst = 'DEC HL';
code = 'this.decHL();';
break;
case 0x2C:
inst = 'INC L';
code = 'this.l = this.inc8(this.l);';
break;
case 0x2D:
inst = 'DEC L';
code = 'this.l = this.dec8(this.l);';
break;
case 0x2E:
operand = toHex(this.readRom8bit(address));
inst = 'LD L,' + operand;
code = 'this.l = ' + operand + ';';
address++;
break;
case 0x2F:
inst = 'CPL';
code = 'this.cpl_a();';
break;
case 0x30:
target = address + this.signExtend(this.readRom8bit(address) + 1);
inst = 'JR NC,(' + toHex(target) + ')';
code = 'if (!((this.f & F_CARRY) != 0x00)) {' +
'this.tstates -= 0x05;' +
'this.pc = ' + toHex(target) + ';' +
'return;' +
'}';
address++;
break;
case 0x31:
operand = toHex(this.readRom16bit(address));
inst = 'LD SP,' + operand;
code = 'this.sp = ' + operand + ';';
address += 2;
break;
case 0x32:
operand = toHex(this.readRom16bit(address));
inst = 'LD (' + operand + '),A';
code = 'this.writeMem(' + operand + ', this.a);';
address += 2;
break;
case 0x33:
inst = 'INC SP';
code = 'this.sp++;';
break;
case 0x34:
inst = 'INC (HL)';
code = 'this.incMem(this.getHL());';
break;
case 0x35:
inst = 'DEC (HL)';
code = 'this.decMem(this.getHL());';
break;
case 0x36:
operand = toHex(this.readRom8bit(address));
inst = 'LD (HL),' + operand;
code = 'this.writeMem(this.getHL(), ' + operand + ');';
address++;
break;
case 0x37:
inst = 'SCF';
code = 'this.f |= F_CARRY; this.f &= ~ F_NEGATIVE; this.f &= ~ F_HALFCARRY;';
break;
case 0x38:
target = address + this.signExtend(this.readRom8bit(address) + 1);
inst = 'JR C,(' + toHex(target) + ')';
code = 'if ((this.f & F_CARRY) != 0x00) {' +
'this.tstates -= 0x05;' +
'this.pc = ' + toHex(target) + ';' +
'return;' +
'}';
address++;
break;
case 0x39:
inst = 'ADD HL,SP';
code = 'this.setHL(this.add16(this.getHL(), this.sp));';
break;
case 0x3A:
operand = toHex(this.readRom16bit(address));
inst = 'LD A,(' + operand + ')';
code = 'this.a = this.readMem(' + operand + ');';
address += 2;
break;
case 0x3B:
inst = 'DEC SP';
code = 'this.sp--;';
break;
case 0x3C:
inst = 'INC A';
code = 'this.a = this.inc8(this.a);';
break;
case 0x3D:
inst = 'DEC A';
code = 'this.a = this.dec8(this.a);';
break;
case 0x3E:
operand = toHex(this.readRom8bit(address));
inst = 'LD A,' + operand;
code = 'this.a = ' + operand + ';';
address++;
break;
case 0x3F:
inst = 'CCF';
code = 'this.ccf();';
break;
case 0x40:
inst = 'LD B,B';
code = '';
break;
case 0x41:
inst = 'LD B,C';
code = 'this.b = this.c;';
break;
case 0x42:
inst = 'LD B,D';
code = 'this.b = this.d;';
break;
case 0x43:
inst = 'LD B,E';
code = 'this.b = this.e;';
break;
case 0x44:
inst = 'LD B,H';
code = 'this.b = this.h;';
break;
case 0x45:
inst = 'LD B,L';
code = 'this.b = this.l;';
break;
case 0x46:
inst = 'LD B,(HL)';
code = 'this.b = this.readMem(this.getHL());';
break;
case 0x47:
inst = 'LD B,A';
code = 'this.b = this.a;';
break;
case 0x48:
inst = 'LD C,B';
code = 'this.c = this.b;';
break;
case 0x49:
inst = 'LD C,C';
code = '';
break;
case 0x4A:
inst = 'LD C,D';
code = 'this.c = this.d;';
break;
case 0x4B:
inst = 'LD C,E';
code = 'this.c = this.e;';
break;
case 0x4C:
inst = 'LD C,H';
code = 'this.c = this.h;';
break;
case 0x4D:
inst = 'LD C,L';
code = 'this.c = this.l;';
break;
case 0x4E:
inst = 'LD C,(HL)';
code = 'this.c = this.readMem(this.getHL());';
break;
case 0x4F:
inst = 'LD C,A';
code = 'this.c = this.a;';
break;
case 0x50:
inst = 'LD D,B';
code = 'this.d = this.b;';
break;
case 0x51:
inst = 'LD D,C';
code = 'this.d = this.c;';
break;
case 0x52:
inst = 'LD D,D';
code = '';
break;
case 0x53:
inst = 'LD D,E';
code = 'this.d = this.e;';
break;
case 0x54:
inst = 'LD D,H';
code = 'this.d = this.h;';
break;
case 0x55:
inst = 'LD D,L';
code = 'this.d = this.l;';
break;
case 0x56:
inst = 'LD D,(HL)';
code = 'this.d = this.readMem(this.getHL());';
break;
case 0x57:
inst = 'LD D,A';
code = 'this.d = this.a;';
break;
case 0x58:
inst = 'LD E,B';
code = 'this.e = this.b;';
break;
case 0x59:
inst = 'LD E,C';
code = 'this.e = this.c;';
break;
case 0x5A:
inst = 'LD E,D';
code = 'this.e = this.d;';
break;
case 0x5B:
inst = 'LD E,E';
code = '';
break;
case 0x5C:
inst = 'LD E,H';
code = 'this.e = this.h;';
break;
case 0x5D:
inst = 'LD E,L';
code = 'this.e = this.l;';
break;
case 0x5E:
inst = 'LD E,(HL)';
code = 'this.e = this.readMem(this.getHL());';
break;
case 0x5F:
inst = 'LD E,A';
code = 'this.e = this.a;';
break;
case 0x60:
inst = 'LD H,B';
code = 'this.h = this.b;';
break;
case 0x61:
inst = 'LD H,C';
code = 'this.h = this.c;';
break;
case 0x62:
inst = 'LD H,D';
code = 'this.h = this.d;';
break;
case 0x63:
inst = 'LD H,E';
code = 'this.h = this.e;';
break;
case 0x64:
inst = 'LD H,H';
code = '';
break;
case 0x65:
inst = 'LD H,L';
code = 'this.h = this.l;';
break;
case 0x66:
inst = 'LD H,(HL)';
code = 'this.h = this.readMem(this.getHL());';
break;
case 0x67:
inst = 'LD H,A';
code = 'this.h = this.a;';
break;
case 0x68:
inst = 'LD L,B';
code = 'this.l = this.b;';
break;
case 0x69:
inst = 'LD L,C';
code = 'this.l = this.c;';
break;
case 0x6A:
inst = 'LD L,D';
code = 'this.l = this.d;';
break;
case 0x6B:
inst = 'LD L,E';
code = 'this.l = this.e;';
break;
case 0x6C:
inst = 'LD L,H';
code = 'this.l = this.h;';
break;
case 0x6D:
inst = 'LD L,L';
code = '';
break;
case 0x6E:
inst = 'LD L,(HL)';
code = 'this.l = this.readMem(this.getHL());';
break;
case 0x6F:
inst = 'LD L,A';
code = 'this.l = this.a;';
break;
case 0x70:
inst = 'LD (HL),B';
code = 'this.writeMem(this.getHL(), this.b);';
break;
case 0x71:
inst = 'LD (HL),C';
code = 'this.writeMem(this.getHL(), this.c);';
break;
case 0x72:
inst = 'LD (HL),D';
code = 'this.writeMem(this.getHL(), this.d);';
break;
case 0x73:
inst = 'LD (HL),E';
code = 'this.writeMem(this.getHL(), this.e);';
break;
case 0x74:
inst = 'LD (HL),H';
code = 'this.writeMem(this.getHL(), this.h);';
break;
case 0x75:
inst = 'LD (HL),L';
code = 'this.writeMem(this.getHL(), this.l);';
break;
case 0x76:
inst = 'HALT';
if (HALT_SPEEDUP)
code = 'this.tstates = 0x00;';
else
code = '';
code += 'this.halt = true; this.pc = ' + toHex(address - 1) + '; return;';
break;
case 0x77:
inst = 'LD (HL),A';
code = 'this.writeMem(this.getHL(), this.a);';
break;
case 0x78:
inst = 'LD A,B';
code = 'this.a = this.b;';
break;
case 0x79:
inst = 'LD A,C';
code = 'this.a = this.c;';
break;
case 0x7A:
inst = 'LD A,D';
code = 'this.a = this.d;';
break;
case 0x7B:
inst = 'LD A,E';
code = 'this.a = this.e;';
break;
case 0x7C:
inst = 'LD A,H';
code = 'this.a = this.h;';
break;
case 0x7D:
inst = 'LD A,L';
code = 'this.a = this.l;';
break;
case 0x7E:
inst = 'LD A,(HL)';
code = 'this.a = this.readMem(this.getHL());';
break;
case 0x7F:
inst = 'LD A,A';
code = '';
break;
case 0x80:
inst = 'ADD A,B';
code = 'this.add_a(this.b);';
break;
case 0x81:
inst = 'ADD A,C';
code = 'this.add_a(this.c);';
break;
case 0x82:
inst = 'ADD A,D';
code = 'this.add_a(this.d);';
break;
case 0x83:
inst = 'ADD A,E';
code = 'this.add_a(this.e);';
break;
case 0x84:
inst = 'ADD A,H';
code = 'this.add_a(this.h);';
break;
case 0x85:
inst = 'ADD A,L';
code = 'this.add_a(this.l);';
break;
case 0x86:
inst = 'ADD A,(HL)';
code = 'this.add_a(this.readMem(this.getHL()));';
break;
case 0x87:
inst = 'ADD A,A';
code = 'this.add_a(this.a);';
break;
case 0x88:
inst = 'ADC A,B';
code = 'this.adc_a(this.b);';
break;
case 0x89:
inst = 'ADC A,C';
code = 'this.adc_a(this.c);';
break;
case 0x8A:
inst = 'ADC A,D';
code = 'this.adc_a(this.d);';
break;
case 0x8B:
inst = 'ADC A,E';
code = 'this.adc_a(this.e);';
break;
case 0x8C:
inst = 'ADC A,H';
code = 'this.adc_a(this.h);';
break;
case 0x8D:
inst = 'ADC A,L';
code = 'this.adc_a(this.l);';
break;
case 0x8E:
inst = 'ADC A,(HL)';
code = 'this.adc_a(this.readMem(this.getHL()));';
break;
case 0x8F:
inst = 'ADC A,A';
code = 'this.adc_a(this.a);';
break;
case 0x90:
inst = 'SUB A,B';
code = 'this.sub_a(this.b);';
break;
case 0x91:
inst = 'SUB A,C';
code = 'this.sub_a(this.c);';
break;
case 0x92:
inst = 'SUB A,D';
code = 'this.sub_a(this.d);';
break;
case 0x93:
inst = 'SUB A,E';
code = 'this.sub_a(this.e);';
break;
case 0x94:
inst = 'SUB A,H';
code = 'this.sub_a(this.h);';
break;
case 0x95:
inst = 'SUB A,L';
code = 'this.sub_a(this.l);';
break;
case 0x96:
inst = 'SUB A,(HL)';
code = 'this.sub_a(this.readMem(this.getHL()));';
break;
case 0x97:
inst = 'SUB A,A';
code = 'this.sub_a(this.a);';
break;
case 0x98:
inst = 'SBC A,B';
code = 'this.sbc_a(this.b);';
break;