Some functions to handle assembler

I was searching for a way to handle assembler code.
Web Editor supports this in a nice way, but how should assembler be treated in modules.
So a small object was born, which supports loading from array and/or from local sdCard.
Location for storage are calculated inside the object, so multiple binarys are easy to handle.
There is also a list of loaded binarys.

function ASM(){
  this.ASMBase = process.memory().stackEndAddress;
  this.ASMList = [];
}
ASM.prototype.loadArray = function(varName,format,arr){
  var a = {name:varName,format:format,start:this.ASMBase + 1};
  for(var i = 0; i < arr.length; i++){
    poke16(this.ASMBase,arr[i]);
    this.ASMBase += 2;
  }
  this.ASMList.push(a);
  eval('var ' + a.name + ' = E.nativeCall(' + a.start + ',"' + a.format + '");');
};
ASM.prototype.loadSD = function(varName,format,fileName){
  var arr,fs = require("fs");
  arr = new Uint16Array(E.toArrayBuffer(fs.readFile(fileName)));
  return(this.loadArray(varName,format,arr));
};
//convert to a module by uncomment next line
//exports.connect = function(){ return new ASM(); }

ASMMod = new ASM();
//load binarys by name, format of variables and array or filename on SD
ASMMod.loadArray("tst1","int(int,int)",[0x1840,0x4770]);//add r0,r0,r1  ...  bx lr
ASMMod.loadArray("tst2","int(int)",[0x4770]);// bx lr
ASMMod.loadSD("tst3","int(int,int)","node_binaries/adder.BIN");//same as tst1 loaded as binary file from sdCard

console.log(ASMMod.ASMList);

console.log(tst1(2,6) + " should be 8");
console.log(tst2(3) + " should be 3");
console.log(tst3(4,5) + " should be 9");