Solution to canyoucrackit#2

vm.js

String.prototype.lpad = function(length, padString) {
  var str = this;
  if (padString == undefined) {
    padString = ' ';
  }
  
  while (str.length < length) {
    str = padString + str;
  }
  
  return str;
}

Number.prototype.toHex = function(zeroFill) {
  if (zeroFill == undefined) {
    zeroFill = 2;
  }
  return "0x" + this.toString(16).lpad(zeroFill, '0');
}

var VM = {
  MEM_SEGMENT_SIZE:  0x10,
  
  mem: [],
  cpu: {
    ip: 0x00,
    
    r0: 0x00,
    r1: 0x00,
    r2: 0x00,
    r3: 0x00,
    
    cs: 0x00,
    ds: 0x10,
    
    fl: 0x00,
    
    firmware: [0xd2ab1f05, 0xda13f110]
  },
  
  interrupted: null,
  cycles: 0,
  lastIP: null,
  observers: {},
  
  ops: {
    // jumpn r1
    0x00: function(op) {
      this.r('ip', this.r(op));
      
      this._notifyOp("JMPN  %r", [op]);
    },
    
    // jumpf r2:r1
    0x01: function(op) {
      var op2 = this.next();
      this.r('ip', this.r(op));
      this.r('cs', op2);
      
      this._notifyOp("JMPF  %r %i", [op, op2]);
    },
    
    // movr0 r1, r2   
    0x02: function(op) {
      var op2 = this.next();
      this.r(op, this.r(op2));
      
      this._notifyOp("MOVR0 %r %r", [op, op2]);
    },
    
    // movr1 r1, imm
    0x03: function(op) {
      var op2 = this.next();
      this.r(op, op2);
      
      this._notifyOp("MOVR1 %r %i", [op, op2]);   
    },
    
    // movm0 r1, [ds:r2]
    0x04: function(op) {
      var op2 = this.next();
      this.r(op, this.m([this.r('ds'), this.r(op2)]));
      
      this._notifyOp("MOVM0 %r [ds:%r]", [op, op2]);
    },
    
    // movm1 [ds:r1], r2
    0x05: function(op) {
      var op2 = this.next();
      this.m([this.r('ds'), this.r(op)], this.r(op2));
      
      this._notifyOp("MOVM1 [ds:%r] %r", [op, op2]);
    },
    
    // add0 r1, r2
    0x06: function(op) {
      var op2 = this.next();
      this.r(op, this.r(op) + this.r(op2));
      
      this._notifyOp("ADD0  %r %r", [op, op2]);
    },
    
    // add1 r1, imm
    0x07: function(op) {
      var op2 = this.next();
      this.r(op, this.r(op) + op2);
      
      this._notifyOp("ADD1  %r %i", [op, op2]);
    },
    
    // xor0 r1, r2
    0x08: function(op) {
      var op2 = this.next();
      this.r(op, this.r(op) ^ this.r(op2));
      
      this._notifyOp("XOR0  %r %r", [op, op2]);
    },
    
    // xor1 r1, imm
    0x09: function(op) {
      var op2 = this.next();
      this.r(op, this.r(op) ^ op2);
      
      this._notifyOp("XOR1  %r %i", [op, op2]);
    },
    
    // cmp0 r1, r2
    0x0a: function(op) {
      var op2 = this.next();
      this.r('fl', this._cmp(this.r(op), this.r(op2)));
      
      this._notifyOp("CMP0  %r %r", [op, op2]);
    },
    
    // cmp1 r1, imm
    0x0b: function(op) {
      var op2 = this.next();
      this.r('fl', this._cmp(this.r(op), op2));
      
      this._notifyOp("CMP1  %r %i", [op, op2]);
    },
    
    // jmpen r1
    0x0c: function(op) {
      if (this.r('fl') == 0x00) {
        this.r('ip', this.r(op));
        this._notifyOp("JMPEN %r", [op]);
      } else {
        this._notifyOp("NOP   (JMPEN)", []);
      }
    },
    
    // jmpef r2:r1
    0x0d: function(op) {
      if (this.r('fl') == 0x00) {
        var op2 = this.next();
        this.r('ip', this.r(op));
        this.r('cs', op2);
        this._notifyOp("JMPEF %r %i", op, op2);
      } else {
        this._notifyOp("NOP   (JMPEF)");
      }
    },
    
    // hlt
    0x0e: function(op) {
      this.interrupt("HALT");
      this._notifyOp("HLT");
    },
    
    // hlt
    0x0f: function(op) {
      this.interrupt("HALT");
      this._notifyOp("HLT");
    }

  },
  
  r: function(r, v) {
    var trans = {4: 'cs', 5: 'ds'};
    r = trans[r] != undefined ? trans[r] : r;
    
    if (typeof r == "number") {
      r = "r" + r;
    }
    
    if (this.cpu[r] == undefined) {
      throw "Invalid register " + r;
    }
    
    if (v != undefined) {
      this.notify("REG_WRITE", {register: r, value: v});
      this.cpu[r] = v;
    } else {
      this.notify("REG_READ", {register: r});
      return this.cpu[r];
    }
  },
  
  m: function(adr, v) {
    if (typeof adr != "number") {
      adr = (adr[0] << 4) + adr[1];
    }
    
    if (this.mem[adr] == undefined) {
      throw new "Memory access violation at " + adr.toHex();
    }
    
    if (v != undefined) {
      this.notify("MEM_WRITE", {idx: adr, value: v});
      this.mem[adr] = v;
    } else {
      this.notify("MEM_READ", {idx: adr});
      return this.mem[adr];
    }
  },
  
  _cmp: function(v1, v2) {
    if (v1 == v2) {
      return 0x00;
    }
    
    return (v1 > v2) ? 0x01 : 0xff;
  },
  
  next: function() {
    return this.m([this.cpu.cs, this.cpu.ip++]);
  },
  
  exec: function(limitCycles) {
    var lim = limitCycles ? this.cycles + limitCycles : -1;
    
    while (this.interrupted == null && (lim == -1 || this.cycles < lim)) {
      this.lastIP = this.cpu['ip'];
      var byt = this.next();
      var opc = byt >> 4;
      var op1 = byt & 0x0F;
        
      if (!this.ops[opc]) {
        throw "Unknown opcode " + opx.toHex();
      }
      
      this.ops[opc].call(this, op1);
      this.cycles++;
    }
    
    
    return this.interrupted != null;
  },
  
  _notifyOp: function(format, args) {
    var data = {
      ip:      this.lastIP,
      cycle:   this.cycles+1,
      nextip:  this.cpu['ip'],
      message: this._format(format, args)
    };
  
    this.notify("OP", data);
  },
  
  _format: function(format, args) {
    args = args || [];
    for (var i=0;i<args.length; i++) {
      var reg = /%([a-z])/;
      var match = format.match(reg);
      var replace = "@undef@";
      
      switch (match[1]) {
        case 'r': replace = 'r' + args[i]; break;
        case 'i': replace = args[i].toHex(); break;    
      }

      format = format.replace(reg, replace); 
    }
    return format;
  },
  
  interrupt: function(type) {
    this.interrupted = type;
    this.notify("INTERRUPT", {interrupt: type});
  },
  
  initMemory: function(mem, offset) {
    if (offset == undefined) {
      offset = 0;
    }
    for (var i=0; i<mem.length; i++) {
      this.mem[offset + i] = mem[i];
    }
  },
  
  initCPU: function(reg) {
    for (var key in reg) {
      this.cpu[key] = reg[key];
    }
  },
  
  reset: function() {
    this.interrupted = null;
    this.cycles = 0;
    this.lastIP = null;
  },
  
  init: function(cpu, mem) {
    this.reset();
    this.initCPU(cpu);
    this.initMemory(mem);
  },
  
  addObserver: function(e, cb) {
    if (this.observers[e] == undefined) {
      this.observers[e] = [];
    }
    
    this.observers[e].push(cb);
  },
  
  notify: function(e, data) {
    if (this.observers[e] == undefined) {
      return;
    }
    
    for (var i=0; i<this.observers[e].length; i++) {
      this.observers[e][i](data, e);
    }
  }
    
};

var VM_MEM = [
    0x31, 0x04, 0x33, 0xaa, 0x40, 0x02, 0x80, 0x03, 0x52, 0x00, 0x72, 0x01, 0x73, 0x01, 0xb2, 0x50,
    0x30, 0x14, 0xc0, 0x01, 0x80, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    
    0x98, 0xab, 0xd9, 0xa1, 0x9f, 0xa7, 0x83, 0x83, 0xf2, 0xb1, 0x34, 0xb6, 0xe4, 0xb7, 0xca, 0xb8,
    0xc9, 0xb8, 0x0e, 0xbd, 0x7d, 0x0f, 0xc0, 0xf1, 0xd9, 0x03, 0xc5, 0x3a, 0xc6, 0xc7, 0xc8, 0xc9,
    0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9,
    0xda, 0xdb, 0xa9, 0xcd, 0xdf, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
    0x26, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9,
    0x7d, 0x1f, 0x15, 0x60, 0x4d, 0x4d, 0x52, 0x7d, 0x0e, 0x27, 0x6d, 0x10, 0x6d, 0x5a, 0x06, 0x56,
    0x47, 0x14, 0x42, 0x0e, 0xb6, 0xb2, 0xb2, 0xe6, 0xeb, 0xb4, 0x83, 0x8e, 0xd7, 0xe5, 0xd4, 0xd9,
    0xc3, 0xf0, 0x80, 0x95, 0xf1, 0x82, 0x82, 0x9a, 0xbd, 0x95, 0xa4, 0x8d, 0x9a, 0x2b, 0x30, 0x69,
    0x4a, 0x69, 0x65, 0x55, 0x1c, 0x7b, 0x69, 0x1c, 0x6e, 0x04, 0x74, 0x35, 0x21, 0x26, 0x2f, 0x60,
    0x03, 0x4e, 0x37, 0x1e, 0x33, 0x54, 0x39, 0xe6, 0xba, 0xb4, 0xa2, 0xad, 0xa4, 0xc5, 0x95, 0xc8,
    0xc1, 0xe4, 0x8a, 0xec, 0xe7, 0x92, 0x8b, 0xe8, 0x81, 0xf0, 0xad, 0x98, 0xa4, 0xd0, 0xc0, 0x8d,
    0xac, 0x22, 0x52, 0x65, 0x7e, 0x27, 0x2b, 0x5a, 0x12, 0x61, 0x0a, 0x01, 0x7a, 0x6b, 0x1d, 0x67,
    0x75, 0x70, 0x6c, 0x1b, 0x11, 0x25, 0x25, 0x70, 0x7f, 0x7e, 0x67, 0x63, 0x30, 0x3c, 0x6d, 0x6a,
    0x01, 0x51, 0x59, 0x5f, 0x56, 0x13, 0x10, 0x43, 0x19, 0x18, 0xe5, 0xe0, 0xbe, 0xbf, 0xbd, 0xe9,
    0xf0, 0xf1, 0xf9, 0xfa, 0xab, 0x8f, 0xc1, 0xdf, 0xcf, 0x8d, 0xf8, 0xe7, 0xe2, 0xe9, 0x93, 0x8e,
    0xec, 0xf5, 0xc8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    
    0x37, 0x7a, 0x07, 0x11, 0x1f, 0x1d, 0x68, 0x25, 0x32, 0x77, 0x1e, 0x62, 0x23, 0x5b, 0x47, 0x55,
    0x53, 0x30, 0x11, 0x42, 0xf6, 0xf1, 0xb1, 0xe6, 0xc3, 0xcc, 0xf8, 0xc5, 0xe4, 0xcc, 0xc0, 0xd3,
    0x85, 0xfd, 0x9a, 0xe3, 0xe6, 0x81, 0xb5, 0xbb, 0xd7, 0xcd, 0x87, 0xa3, 0xd3, 0x6b, 0x36, 0x6f,
    0x6f, 0x66, 0x55, 0x30, 0x16, 0x45, 0x5e, 0x09, 0x74, 0x5c, 0x3f, 0x29, 0x2b, 0x66, 0x3d, 0x0d,
    0x02, 0x30, 0x28, 0x35, 0x15, 0x09, 0x15, 0xdd, 0xec, 0xb8, 0xe2, 0xfb, 0xd8, 0xcb, 0xd8, 0xd1,
    0x8b, 0xd5, 0x82, 0xd9, 0x9a, 0xf1, 0x92, 0xab, 0xe8, 0xa6, 0xd6, 0xd0, 0x8c, 0xaa, 0xd2, 0x94,
    0xcf, 0x45, 0x46, 0x67, 0x20, 0x7d, 0x44, 0x14, 0x6b, 0x45, 0x6d, 0x54, 0x03, 0x17, 0x60, 0x62,
    0x55, 0x5a, 0x4a, 0x66, 0x61, 0x11, 0x57, 0x68, 0x75, 0x05, 0x62, 0x36, 0x7d, 0x02, 0x10, 0x4b,
    0x08, 0x22, 0x42, 0x32, 0xba, 0xe2, 0xb9, 0xe2, 0xd6, 0xb9, 0xff, 0xc3, 0xe9, 0x8a, 0x8f, 0xc1,
    0x8f, 0xe1, 0xb8, 0xa4, 0x96, 0xf1, 0x8f, 0x81, 0xb1, 0x8d, 0x89, 0xcc, 0xd4, 0x78, 0x76, 0x61,
    0x72, 0x3e, 0x37, 0x23, 0x56, 0x73, 0x71, 0x79, 0x63, 0x7c, 0x08, 0x11, 0x20, 0x69, 0x7a, 0x14,
    0x68, 0x05, 0x21, 0x1e, 0x32, 0x27, 0x59, 0xb7, 0xcf, 0xab, 0xdd, 0xd5, 0xcc, 0x97, 0x93, 0xf2,
    0xe7, 0xc0, 0xeb, 0xff, 0xe9, 0xa3, 0xbf, 0xa1, 0xab, 0x8b, 0xbb, 0x9e, 0x9e, 0x8c, 0xa0, 0xc1,
    0x9b, 0x5a, 0x2f, 0x2f, 0x4e, 0x4e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
];

var VM_CPU = {
  ip: 0x00,
    
  r0: 0x00,
  r1: 0x00,
  r2: 0x00,
  r3: 0x00,
    
  cs: 0x00,
  ds: 0x10,
    
  fl: 0x00,
}