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assem.html
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<!DOCTYPE html>
<html>
<head>
<title>
Assembler by Mark Craig (youtube.com/MrMcSoftware) Copyright © 2023
</title>
<style>
body
{
background-color: black;
color: white;
/* Uncomment transition line for gradual dark/light mode change */
/* transition: color 300ms, background-color 300ms; */
}
body.dark-mode
{
background-color: black;
color: white;
}
body.dark-mode a:link { color: #f0f000; }
body.dark-mode a:visited { color: #00ff00; }
body.dark-mode code { background-color: #404040; }
body.light-mode
{
background-color: #d0d0d0;
color: black;
}
body.light-mode a:link { color: #0000f0; }
body.light-mode a:visited { color: #a000a0; }
body.light-mode code { background-color: #ffffff; }
/* tab stops of 8 are a bit much for my tastes, adjust to your prefs. */
textarea, pre { -moz-tab-size: 4; -o-tab-size: 4; tab-size: 4; }
.modal
{
display: none;
position: fixed;
z-index: 1;
padding-top: 100px;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgb(0,0,0);
background-color: rgba(0,0,0,0.4);
}
.modal-content
{
position: relative;
background-color: #171717;
margin: auto;
padding: 0;
border: 2px solid #6797ff;
width: 40%;
box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
}
.close
{
color: white;
float: right;
font-size: 18px;
font-weight: bold;
}
.close:hover,
.close:focus
{
color: #ff4040;
text-decoration: none;
cursor: pointer;
}
.modal-header
{
padding: 2px 16px;
background-color: #1022e4;
color: white;
font-size: 14px;
font-weight: bold;
}
.modal-body { padding: 2px 16px; color: white; font-size: 14px; }
</style>
<body>
<div style="float:left">
<textarea id="assemID" rows="34" cols="82" value="" style="background-color:#000050; color:#fff;" spellcheck="false" wrap="off" onkeydown='assemInput(event)'></textarea> <br>
<button onclick="runAssem()">Assemble</button>
<button onclick="saveAssem()">Save As: </button>
<input id="saveNameID" type="text" value="" maxlength="32" size=8 title="Filename to use for saving your assembly source code" style="background-color:#d0d000; color:#000;"/>
<input id="assemFileID" name="files" type="file"/>
</div>
<div style="float:left">
<textarea id="assemConsoleID" rows="34" cols="42" value="" style="background-color:#000050; color:#fff;" readonly></textarea> <br>
<select id="assemVerboseID" onchange="setAssemVerbose()" title="Set how verbose level of assembly errors, warnings, information, and statistics">
<option value="0">Just error messages</option>
<option value="1" selected>Also general messages</option>
<option value="2">Also parsed strings</option>
<option value="3">Also final machine code</option>
</select>
</div>
<div>
<button onclick="clearAssem()" title="Clear/Erase everything in the assembly source edit window" style="width:180px">Erase Assembly Source</button><br><br>
<button onclick="saveBin()" title="Export/Save assembled machine code to a Logisim RAM file (which also can be loaded into this simulator)" style="width:180px">Save Machine Code As:</button>
<input id="saveExportNameID" type="text" value="" maxlength="32" size=8 title="Filename to use for saving your assembled machine code" style="background-color:#e0c000; color:#000;"/><br><br>
</div>
<script>
//const RAMSIZE=65536;
//const RAMSIZE=16777216;
const RAMSIZE=8388608;
const assem=document.getElementById("assemID");
const acon=document.getElementById("assemConsoleID");
var RAM=new Array(RAMSIZE);
var pos=0,len,pass=0;
var equs={};
var labels={};
var addr=0,out=1,out2=0,v,dnl=1,verba=1;
var sourceName="untitled.asm";
function setAssemVerbose()
{
verba=parseInt(document.getElementById("assemVerboseID").value);
}
// won't work in some browsers
function assemInput(event)
{
if (event.keyCode===9)
{
var startPos=assem.selectionStart;
var endPos=assem.selectionEnd;
assem.value=assem.value.substring(0,startPos)+"\t"+assem.value.substring(endPos);
assem.selectionStart=assem.selectionEnd=startPos+1;
if (event.preventDefault) { event.preventDefault(); }
else { event.returnValue=false; }
return(false);
}
}
function saveAssem()
{
var name=document.getElementById("saveNameID").value;
if (name!=="") { sourceName=name; }
blob=new Blob([assem.value],{ type:'text/plain'});
const blobUrl=window.URL.createObjectURL(blob);
var link=window.document.createElement("a");
link.href=blobUrl;
link.download=sourceName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
// despite what someone said, don't revoke
//window.URL.revokeObjectURL(blobUrl);
}
function saveBin()
{
var name=document.getElementById("saveExportNameID").value;
if (name!=="") { binName=name; }
var machinecode="v2.0 raw\n";
for (i=0;i<addr;i++)
{
var opcode=(RAM[i]&0x000000ff).toString(16);
opcode="0".repeat((n=2-opcode.length)>0?n:0)+opcode;
machinecode+=(RAM[i]>>>8).toString(16)+opcode+" ";
if (((i+1)%8)==0) { machinecode+="\n"; }
}
blob=new Blob([machinecode],{ type:'text/plain'});
const blobUrl=window.URL.createObjectURL(blob);
var link=window.document.createElement("a");
link.href=blobUrl;
link.download=binName;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
// despite what someone said, don't revoke
//window.URL.revokeObjectURL(blobUrl);
}
function clearAssem()
{
assem.value="";
}
function INST1(x)
{
var str=getStr();
val=lookupVal(str);
RAM[addr]=(val<<8)|x;
if ((out2)&&(pass===2))
{
var opcode=(RAM[addr]&0x000000ff).toString(16);
opcode="0".repeat((n=2-opcode.length)>0?n:0)+opcode;
acon.value+="** "+(RAM[addr]>>>8).toString(16)+opcode+"\n";
}
addr++;
}
function INST2(x)
{
RAM[addr]=x;
if ((out2)&&(pass===2))
{
var opcode=(RAM[addr]&0x000000ff).toString(16);
opcode="0".repeat((n=2-opcode.length)>0?n:0)+opcode;
acon.value+="** "+(RAM[addr]>>>8).toString(16)+opcode+"\n";
}
addr++;
}
function isAlpha(c)
{
return(((c>='a')&&(c<='z'))||((c>='A')&&(c<='Z')));
}
function lookupVal(str)
{
var val,valf;
var c=str.charAt(0);
if (isAlpha(c))
{
var l=equs[str];
if (typeof(l)!=='undefined') { val=l; return(val); }
var l=labels[str];
if (typeof(l)!=='undefined') { val=l; return(val); }
if (pass===2) { acon.value+=" **** ERROR: "+str+" not found\n"; return(-1); }
return(-1);
}
else if (c==='\'') { val=str.charCodeAt(1); }
else if (c==='$') { val=parseInt(str.substring(1),16); }
else if (c==='~') { valf=parseFloat(str.substring(1)); val=FloatToIEEE(valf); }
else if (c==='%') { val=parseInt(str.substring(1),2); }
else { val=parseInt(str); }
return(val);
}
function printLabels()
{
acon.value+="Labels:\n";
var keys=Object.keys(labels);
for (i=0;i<keys.length;i++) { acon.value+=" "+(keys[i]+" "+labels[keys[i]].toString(16)+" ("+labels[keys[i]].toString()+")\n"); }
}
function runAssem()
{
acon.value="";
equs={};
labels={};
astr=assem.value;
//console.log(astr);
len=astr.length;
//console.log(len);
// Two passes to get addresses of labels that are used before they are defined
addr=0; pos=0; pass=1;
while (parse()) { }
addr=0; pos=0; pass=2;
while (parse()) { }
if (verba>=1) { acon.value+="\nAddress space: "+addr+"\n"; printLabels(); }
if (verba===3)
{
acon.value+='\nMachine Code ("v2.0 raw" if Logisim compatibility desired):\n\n';
acon.value+="v2.0 raw\n";
for (i=0;i<addr;i++)
{
var opcode=(RAM[i]&0x000000ff).toString(16);
opcode="0".repeat((n=2-opcode.length)>0?n:0)+opcode;
acon.value+=(RAM[i]>>>8).toString(16)+opcode+" ";
}
}
}
function outputTTY(v,aReg)
{
if (aReg) { RAM[addr]=(v<<8)|0x16; RAM[addr+1]=0x8000001f; }
else { RAM[addr]=(v<<8); RAM[addr+1]=0x80000002; }
}
function scanStringForEither(str1,str2)
{
var var1;
while (1)
{
var1=getStr();
if (var1===str1) return(0);
else if (var1===str2) return(1);
else if (pos>=len) return(-1);
else if (var1.charAt(0)==='#') { while (((astr.charAt(pos))!=='\n')&&(pos<len)) { pos++; } }
}
}
function scanNested(str1,str2)
{
var c,i=1;
while (i>0)
{
c=scanStringForEither(str1,str2);
if (c===0) i--;
else if (c===1) i++;
else break;
}
}
function getStr()
{
while (((astr.charAt(pos)===" ")||(astr.charAt(pos)==="\n")||(astr.charAt(pos)==='\t'))&&(pos<len)) { pos++; }
var ns=pos;
while ((astr.charAt(pos)!==' ')&&(astr.charAt(pos)!=='\n')&&(astr.charAt(pos)!=='\t')&&(pos<len)) { pos++; }
var str=astr.substring(ns,pos);
//if (astr.charCodeAt(pos)===32) { pos++; }
//if (astr.charCodeAt(pos)===13) { pos++; }
//if (astr.charCodeAt(pos)===10) { pos++; }
return(str);
}
function parse()
{
var val,i,nl,eos,inline0,areg;
var str;
str=getStr();
//console.log("parse: "+str);
if ((verba>=2)&&(pass===2)) { acon.value+="> "+str+"\n"; }
if (str.charAt(0)==='#') { while (((astr.charAt(pos))!=='\n')&&(pos<len)) { pos++; } }
var strU=str.toUpperCase();
if (strU==="EQU")
{
var name=getStr();
var value=lookupVal(getStr());
equs[name]=value;
}
else if (strU===":")
{
var name=getStr();
labels[name]=addr;
if ((verba>=2)&&(pass===2)) { acon.value+="Label: '"+name+"' "+addr+"\n"; }
}
else if (strU==="LOADI") { INST1(0); }
else if (strU==="LOAD") { INST1(1); }
else if (strU==="STOREI") { INST1(2); }
else if (strU==="STORE") { INST1(3); if ((out)&&(pass===2)) { acon.value+=" **** WARNING: Instruction 'STORE' doesn't work\n"; } }
else if (strU==="ADDI") { INST1(4); }
else if (strU==="ADD") { INST1(5); }
else if (strU==="SUBI") { INST1(6); }
else if (strU==="SUB") { INST1(7); }
else if (strU==="JUMP") { INST1(8); }
else if (strU==="JUMPI") { INST1(9); }
else if (strU==="JUMPII") { INST1(10); if ((out)&&(pass===2)) { acon.value+=" **** WARNING: Instruction 'JUMPII' doesn't work\n"; } }
else if (strU==="DATAIN") { INST2(11); }
else if (strU==="HALT") { INST2(12); }
else if (strU==="SKIPNEG") { INST2(13); }
else if (strU==="STROBE") { INST2(14); }
else if (strU==="NOOP") { INST2(15); }
else if (strU==="MULI") { INST1(16); }
else if (strU==="MUL") { INST1(17); }
else if (strU==="DIVI") { INST1(18); }
else if (strU==="DIV") { INST1(19); }
else if (strU==="MODI") { INST1(20); }
else if (strU==="MOD") { INST1(21); }
else if (strU==="LOADAI") { INST1(22); }
else if (strU==="LOADA") { INST1(23); }
else if (strU==="JUMPEQI") { INST1(24); }
else if (strU==="JUMPGTI") { INST1(25); }
else if (strU==="JUMPLTI") { INST1(26); }
else if (strU==="JUMPNEQI") { INST1(27); }
else if (strU==="JUMPGTEI") { INST1(28); }
else if (strU==="JUMPLTEI") { INST1(29); }
else if (strU==="NEGY") { INST2(30); }
else if (strU==="STOREAI") { INST1(31); }
else if (strU==="LOADAIND") { INST2(32); }
else if (strU==="ANDI") { INST1(33); }
else if (strU==="AND") { INST1(34); }
else if (strU==="ORI") { INST1(35); }
else if (strU==="OR") { INST1(36); }
else if (strU==="NOT") { INST2(37); }
else if (strU==="XORI") { INST1(38); }
else if (strU==="XOR") { INST1(39); }
else if (strU==="JUMPEQ") { INST1(40); }
else if (strU==="JUMPGT") { INST1(41); }
else if (strU==="JUMPLT") { INST1(42); }
else if (strU==="JUMPNEQ") { INST1(43); }
else if (strU==="JUMPGTE") { INST1(44); }
else if (strU==="JUMPLTE") { INST1(45); }
else if (strU==="STOREAIND") { INST2(46); }
else if (strU==="FADDA") { INST2(47); }
else if (strU==="FADD") { INST1(48); }
else if (strU==="FSUBA") { INST2(49); }
else if (strU==="FSUB") { INST1(50); }
else if (strU==="FMULA") { INST2(51); }
else if (strU==="FMUL") { INST1(52); }
else if (strU==="FDIVA") { INST2(53); }
else if (strU==="FDIV") { INST1(54); }
else if (strU==="FMODA") { INST2(55); }
else if (strU==="FMOD") { INST1(56); }
else if (strU==="FNEGY") { INST2(57); }
else if (strU==="FSQRTY") { INST2(58); }
else if (strU==="FSQRT") { INST1(59); }
else if (strU==="FSINY") { INST2(60); }
else if (strU==="FSIN") { INST1(61); }
else if (strU==="FCOSY") { INST2(62); }
else if (strU==="FCOS") { INST1(63); }
else if (strU==="FTANY") { INST2(64); }
else if (strU==="FTAN") { INST1(65); }
else if (strU==="FASINY") { INST2(66); }
else if (strU==="FASIN") { INST1(67); }
else if (strU==="FACOSY") { INST2(68); }
else if (strU==="FACOS") { INST1(69); }
else if (strU==="FATANY") { INST2(70); }
else if (strU==="FATAN") { INST1(71); }
else if (strU==="FATAN2A") { INST2(72); }
else if (strU==="FATAN2") { INST1(73); }
else if (strU==="FPOWA") { INST2(74); }
else if (strU==="FPOW") { INST1(75); }
else if (strU==="FLNY") { INST2(76); }
else if (strU==="FLN") { INST1(77); }
else if (strU==="FLOGY") { INST2(78); }
else if (strU==="FLOG") { INST1(79); }
else if (strU==="FABSY") { INST2(80); }
else if (strU==="FABS") { INST1(81); }
else if (strU==="FEXPY") { INST2(82); }
else if (strU==="FEXP") { INST1(83); }
else if (strU==="FPTOINTY") { INST2(84); }
else if (strU==="FPTOINT") { INST1(85); }
else if (strU==="INTTOFPY") { INST2(86); }
else if (strU==="INTTOFP") { INST1(87); }
else if (strU==="FJUMPEQI") { INST1(88); }
else if (strU==="FJUMPGTI") { INST1(89); }
else if (strU==="FJUMPLTI") { INST1(90); }
else if (strU==="FJUMPNEQI") { INST1(91); }
else if (strU==="FJUMPGTEI") { INST1(92); }
else if (strU==="FJUMPLTEI") { INST1(93); }
else if (strU==="FJUMPEQ") { INST1(94); }
else if (strU==="FJUMPGT") { INST1(95); }
else if (strU==="FJUMPLT") { INST1(96); }
else if (strU==="FJUMPNEQ") { INST1(97); }
else if (strU==="FJUMPGTE") { INST1(98); }
else if (strU==="FJUMPLTE") { INST1(99); }
else if (strU==="CALL") { INST1(100); }
else if (strU==="RETURN") { INST2(101); }
else if (strU==="PUSH") { INST2(102); }
else if (strU==="POP") { INST2(103); }
else if (strU==="SREAD") { INST1(104); }
else if (strU==="FASTINTR") { INST2(253); }
else if (strU==="BREAKPOINTS") { INST1(254); }
else if (strU==="BREAKPOINT") { INST1(255); }
else if (strU==="\*\/") { if (pass===2) { acon.value+=" **** ERROR: \*\/ without \/\*\n"; } }
else if (strU.substring(0,2)==="\/\*") { scanNested("\*\/","\/\*"); }
else if (strU==="DC")
{
str=getStr();
var i,j,dcarr=str.split(",");
for (i=0;i<dcarr.length;i++)
{
var f=dcarr[i].charAt(0);
if (f==='$') { RAM[addr]=parseInt(dcarr[i].substring(1),16); addr++; }
else if (f==='\'') { for (j=1;j<dcarr[i].length-1;j++) { RAM[addr]=dcarr[i].charCodeAt(j); addr++; } }
else { RAM[addr]=lookupVal(dcarr[i]); addr++; }
}
}
else if (strU.substring(0,3)==="DCS")
{
var nl=eos=inline0=areg=0;
for (i=3;i<strU.length;i++)
{
var f=strU.charAt(i);
if (f==='N') { nl=1; }
else if (f==='0') { eos=1; }
else if (f==='I') { inline0=1; }
else if (f==='A') { areg=1; }
else if (pass===2) { acon.value+=" **** ERROR: Unknown Instr.: "+str+"\n"; }
}
pos++;
var p=pos;
while ((astr.charAt(pos)!=='\n')&&(pos<len)) { pos++; }
str=astr.substring(p,pos);
if (inline0)
{
for (i=0;i<str.length;i++) { outputTTY(str.charCodeAt(i),areg); addr+=2; }
if (nl) { if (dnl) { outputTTY(13,areg); addr+=2; } else { outputTTY(10,areg); addr+=2; } }
}
else
{
for (i=0;i<str.length;i++) { RAM[addr]=str.charCodeAt(i); addr++; }
if (nl)
{
if (dnl) { RAM[addr]=13; addr++; } else { RAM[addr+1]=10; addr++; }
} // 13 or 10 works
if (eos) { RAM[addr]=0; addr++; }
}
}
else if (strU==="DS")
{
str=getStr();
val=lookupVal(str);
for (i=0;i<val;i++) { RAM[i+addr]=0; } addr+=val;
}
else if (strU==="OUTPUT") { out2=parseInt(getStr()); }
else if ((strU.charAt(0)!=='#')&&(strU!=="")&&(pass===2)) { acon.value+=" **** ERROR: Unknown Instr.: "+str+"\n"; }
if (pos>=len) { return(0); }
return(1);
}
function FloatToIEEE(f)
{
var buf=new ArrayBuffer(4);
(new Float32Array(buf))[0]=f;
return((new Uint32Array(buf))[0]);
}
document.getElementById("assemFileID").onchange=function(event)
{
if (!window.FileReader) { return; } // Browser is not compatible
var reader=new FileReader();
reader.onload=function(event)
{
if (event.target.readyState!=2) { return; }
if (event.target.error) { alert('Error while reading file'); return; }
assem.value=event.target.result;
};
reader.readAsText(event.target.files[0]);
};
</script>
</body>
</html>