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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width">
<title>MIPS Interpreter</title>
<meta name="description" content="MIPS Assembly Interpreter written in Javascript">
<link rel="stylesheet" type="text/css" href="static/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="static/mips.css">
<link rel="stylesheet" href="https://codemirror.net/lib/codemirror.css">
</head>
<body>
<div class="container">
<div class="page-header">
<h1>MIPS Interpreter</h1>
by Marcel Ullrich<br>
Interface derived from <a href="https://github.com/dannyqiu/mips-interpreter">Danny Qiu</a><br>
Interpreter by Dominik Luche
</div>
<div id="warnings-container" class="alert alert-warning" style="display: none;"></div>
<div id="errors-container" class="alert alert-danger" style="display: none;">
<p class="lead">There were errors...</p>
<div id="errors"></div>
</div>
<div class="row">
<div class="col-md-6">
<p class="lead">Input your MIPS code here:</p>
<div class="form-group">
<textarea id="code" rows="15" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false">
.text
li $t0, 21
li $t1, 0
sw $t0, ($t1)
loop:
beq $t0, $zero, end
addi $t0, $t0, -1
addi $t1, $t1, 2
j loop
end:
</textarea>
</div>
<div class="btn-group btn-group-justified" role="group">
<div class="btn-group">
<button id="reset" class="btn btn-primary">Reset</button>
</div>
<div class="btn-group">
<button id="backstep" class="btn btn-warning">Back</button>
</div>
<div class="btn-group">
<button id="step" class="btn btn-warning">Step</button>
</div>
<div class="btn-group">
<button id="run" class="btn btn-success">Run</button>
</div>
<div class="btn-group" style="display: none;">
<button id="stop" class="btn btn-danger">Stop</button>
</div>
<div class="btn-group">
<button id="freq" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
CPU: 32 Hz
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#" onclick="setFrequency(1);">1 Hz</a></li>
<li><a href="#" onclick="setFrequency(2);">2 Hz</a></li>
<li><a href="#" onclick="setFrequency(4);">4 Hz</a></li>
<li><a href="#" onclick="setFrequency(8);">8 Hz</a></li>
<li><a href="#" onclick="setFrequency(16);">16 Hz</a></li>
<li><a href="#" onclick="setFrequency(32);">32 Hz</a></li>
<li><a href="#" onclick="setFrequency(64);">64 Hz</a></li>
<li><a href="#" onclick="setFrequency(128);">128 Hz</a></li>
<li><a href="#" onclick="setFrequency(256);">256 Hz</a></li>
</ul>
</div>
</div>
<br>
<div id="recent-instruction" class="well">The most recent instructions will be shown here when stepping.</div>
<hr>
<h4>Features</h4>
<ul>
<li><em>Reset</em> to load the code, <em>Step</em> one instruction, or <em>Run</em> all instructions</li>
<li>View <a href="#register-table">registers</a> on the right, <a href="#memory-table">memory</a> on the bottom of this page</li>
</ul>
<p>MIPS Reference: <a href="mips_vol2.pdf">mips_vol2.pdf</a></p>
<div class="form-inline text-center">
<button id="share" class="btn btn-primary">Share</button>
<input type="text" id="share-address" class="form-control" placeholder="Url with encoded source code" value="" readonly>
</div>
</div>
<div class="col-md-6">
<div id="register-table" class="table-responsive">
<table class="table table-hover table-condensed">
<thead>
<tr>
<th>Init Value</th>
<th>Register</th>
<th>Decimal</th>
<th>Hex</th>
<th>Binary</th>
</tr>
</thead>
<tbody id="registers">
<tr><td>0</td><td>$0 ($zero)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$1 ($at)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$2 ($v0)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$3 ($v1)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$4 ($a0)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$5 ($a1)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$6 ($a2)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$7 ($a3)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$8 ($t0)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$9 ($t1)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$10 ($t2)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$11 ($t3)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$12 ($t4)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$13 ($t5)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$14 ($t6)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$15 ($t7)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$16 ($s0)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$17 ($s1)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$18 ($s2)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$19 ($s3)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$20 ($s4)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$21 ($s5)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$22 ($s6)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$23 ($s7)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$24 ($t8)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$25 ($t9)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$26 ($k0)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$27 ($k1)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$28 ($gp)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$29 ($sp)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$30 ($fp)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td><input class="init-value" type="text" value="0"></td><td>$31 ($ra)</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
</tbody>
</table>
</div>
</div>
</div>
<hr>
<div class="row">
<div class="col-md-12">
<div class="form-inline text-center">
<div class="form-group">
<label for="memory-address">Memory Address</label>
<input type="text" id="memory-address" class="form-control" placeholder="0x00000000" value="0x00000000">
</div>
<button id="memory-go" class="btn btn-primary">Go</button>
<button id="memory-download" class="btn btn-primary">Download!</button>
</div>
<br>
<div id="memory-table" class="table-responsive">
<table class="table table-hover table-condensed">
<thead>
<tr>
<th>Memory Address</th>
<th>Decimal</th>
<th>Hex</th>
<th>Binary</th>
</tr>
</thead>
<tbody id="memory">
<tr><td>0x00000000</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000004</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000008</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x0000000c</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000010</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000014</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000018</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x0000001c</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000020</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
<tr><td>0x00000024</td><td>0</td><td>0x00000000</td><td>0b00000000000000000000000000000000</td></tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<script src="static/jsmipssim.min.js"></script>
<script src="static/jquery.min.js"></script>
<script src="static/sprintf.min.js"></script>
<script src="static/bootstrap.min.js"></script>
<script src="static/FileSaver.js"></script>
<script src="https://codemirror.net/lib/codemirror.js"></script>
<script src="https://codemirror.net/mode/gas/gas.js"></script>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById('code'), {
mode: {name: "gas", architecture: "ARMv6"},
lineNumbers: true,
});
editor.on("change",function() {
stop();
if (!programTerminated) {
programTerminated = true;
document.getElementById('recent-instruction').innerHTML += "<br>Execution automatically stopped because of code change."
}
globalP = undefined;
});
</script>
<script>
"use strict";
var globalP = undefined;//new Assembler("");
var initialRegisters = new Int32Array(32);
var recentInsns = [];
var runner = undefined;
var programTerminated = true;
var cpuFrequency = 32;
var activeLine=-1;
var lastpc=-1;
function setFrequency(freq) {
cpuFrequency = freq;
document.getElementById('freq').innerHTML = 'CPU: ' + freq + ' Hz <span class="caret"></span>'
if (runner !== undefined) {
stop();
runner = setInterval(stepWithBreakpoint, 1000 / cpuFrequency);
}
}
function setup() {
stop();
clearAlerts(); // Clear any previous warnings/errors
programTerminated = false;
editor.save();
var code = document.getElementById('code').value;
console.log(code);
try {
mips.assemble(code);
}catch(e) {
// if(e is instanceof Error)
// console.log(e.message);
document.getElementById('errors').innerHTML = [e.message].join('<br>');
document.getElementById('errors-container').style.display = "";
return;
}
globalP=mips._a;
initializeRegisters(globalP);
recentInsns = [];
displayRegisters();
displayMemory();
displayErrors();
document.getElementById('backstep').parentElement.style.display = "";
document.getElementById('step').parentElement.style.display = "";
document.getElementById('run').parentElement.style.display = "";
document.getElementById('stop').parentElement.style.display = "none";
trackInstr();
}
document.getElementById('reset').addEventListener('click', function() {
setup();
document.getElementById('recent-instruction').innerHTML = "The most recent instructions will be shown here when stepping."
});
document.getElementById('backstep').addEventListener('click', function() {
if (globalP === undefined) {
setup();
}
backstep();
});
document.getElementById('step').addEventListener('click', function() {
if (globalP === undefined) {
setup();
}
step();
});
document.getElementById('run').addEventListener('click', function() {
if (globalP === undefined) {
setup();
}
clearAlerts();
runner = setInterval(stepWithBreakpoint, 1000 / cpuFrequency);
document.getElementById('backstep').parentElement.style.display = "none";
document.getElementById('step').parentElement.style.display = "none";
document.getElementById('run').parentElement.style.display = "none";
document.getElementById('stop').parentElement.style.display = "";
});
document.getElementById('stop').addEventListener('click', function() {
stop();
document.getElementById('backstep').parentElement.style.display = "";
document.getElementById('step').parentElement.style.display = "";
document.getElementById('run').parentElement.style.display = "";
document.getElementById('stop').parentElement.style.display = "none";
});
document.getElementById('memory-go').addEventListener('click', displayMemory);
document.getElementById('share').addEventListener('click', shareLink);
function shareLink() {
editor.save();
var code = document.getElementById('code').value;
// TODO: initial regs
// var str=encodeURI(JSON.stringify(code));
var str=encodeURIComponent(code);
var url = window.location.href.split('?')[0];
var completeUrl=url+"?code="+str;
document.getElementById("share-address").value=completeUrl;
}
function clearHighlight() {
if(activeLine>=0) {
editor.removeLineClass(activeLine,"background","CodeMirror-activeline-background");
activeLine=-1;
}
}
function instrFromPC(pc) {
var loc = globalP.instructionsDisplay.find((e) => e[0]==pc);
if(!loc)
return undefined;
var instr=loc[3];
if(instr.instruction)
instr=instr.instruction;
return instr;
}
function trackInstr(forward=true) {
clearHighlight();
if(forward && lastpc>0) {
var instr=instrFromPC(lastpc);
if(instr) {
// console.log("executed",instr);
if (recentInsns.length >= 5) {
recentInsns.shift(); // removes the oldest instruction
}
recentInsns.push(instr);
}
} else if(!forward) {
if(recentInsns.length>0)
recentInsns.pop();
}
var newpc = globalP.machine.registers.getPC();
var newInstr=instrFromPC(newpc);
if(!newInstr)
return;
let line=-1;
if(newInstr.token)
line = newInstr.token.line;
if(line<0)
return;
activeLine=line;
editor.addLineClass(line,"background","CodeMirror-activeline-background");
}
function getRecentInsnsHTML() {
var recentInstructionHTML = "";
for (var i = 0; i < recentInsns.length; ++i) {
// mark the last element as the current instruction executed
const instr=recentInsns[i];
let instrTxt= "L"+instr.token.line+": "+instr.name+" "+instr.params.join(" ")+"<br>";
if (i === recentInsns.length-1) {
instrTxt='<span class="current">'+instrTxt+'</span>';
}
recentInstructionHTML+=instrTxt;
// "[line " + recentInsns[i][0][1] + "]: " + recentInsns[i][0][2] + ((recentInsns[i][1]) ? " (Delay Slot)":"") + "<br>";
}
return recentInstructionHTML;
}
function backstep() {
lastpc = globalP.machine.registers.getPC();
if(!mips.backstep()) {
// trackInstr();
}else{
// trackInstr();
// document.getElementById('recent-instruction').innerHTML = getRecentInsnsHTML();
}
trackInstr(false);
document.getElementById('recent-instruction').innerHTML = getRecentInsnsHTML();
displayRegisters();
displayMemory();
displayErrors();
}
function step() {
lastpc = globalP.machine.registers.getPC();
if(!mips.step()) {
trackInstr(true);
document.getElementById('recent-instruction').innerHTML = getRecentInsnsHTML();
}else {
if (!programTerminated) {
programTerminated = true;
document.getElementById('recent-instruction').innerHTML += "<br>No more instructions to run! Press <em>Reset</em> to reload the code!";
}
}
displayRegisters();
displayMemory();
displayErrors();
}
function stepWithBreakpoint() {
step();
}
function stop() {
lastpc=-1;
clearHighlight();
if (runner !== undefined) {
clearInterval(runner);
}
runner = undefined;
}
function displayRegisters() {
var registers = globalP.machine.registers;
var registersHTML = "";
for (var i = 0; i < 32; ++i) {
let cell0="";
if(i==0) {
cell0='%d';
}else {
cell0='<input class="init-value" type="text" value="%d">';
}
var format = '<tr><td>'+cell0+'</td><td>$%d (%s)</td><td>%d</td><td>0x%08x</td><td>0b%032s</td></tr>';
var regVal = registers.get(i);
registersHTML += sprintf(format,
initialRegisters[i], i, getRegisterSyntacticSugar(i), regVal, regVal >>> 0, (regVal >>> 0).toString(2));
}
if (registersHTML != document.getElementById('registers').innerHTML) {
document.getElementById('registers').innerHTML = registersHTML;
}
}
function displayMemory() {
var memory = globalP.machine.memory;
var memoryHTML = "";
var memAddress = parseInt(document.getElementById('memory-address').value) >>> 0;
var addr = memAddress - (memAddress % 4); // keep memory locations as multiple of 4
// TODO:
if (false && !memory.isValidAddress(addr)) {
memoryHTML = '<tr class="danger"><td>Invalid memory location: ' + sprintf("0x%x", memAddress) + '. Memory addresses must be from 0x00000000 - 0x7fffffff</td><td></td><td></td><td></td></tr>';
}
else {
var start = Math.max(addr - 40, 0x00000000);
var end = Math.min(addr + 40, 0x80000000);
for (var i = start; i < end; i += 4) {
var memValue = memory.readWord(i);
memoryHTML += (memValue == 0) ? '<tr>' : '<tr class="info">';
memoryHTML += sprintf("<td>0x%08x</td><td>%d</td><td>0x%08x</td><td>0b%032s</td>",
i, memValue, memValue >>> 0, (memValue >>> 0).toString(2));
memoryHTML += '</tr>';
}
}
if (memoryHTML != document.getElementById('memory').innerHTML) {
document.getElementById('memory').innerHTML = memoryHTML;
}
}
function displayErrors() {
// TODO:
var errors = [];//globalP.getErrors();
if (errors.length > 0) {
document.getElementById('errors').innerHTML = errors.join('<br>');
document.getElementById('errors-container').style.display = "";
}
}
function clearAlerts() {
document.getElementById('warnings-container').innerHTML = '';
document.getElementById('warnings-container').style.display = "none";
document.getElementById('errors').innerHTML = '';
document.getElementById('errors-container').style.display = "none";
}
function initializeRegisters(program) {
// TODO:
initialRegisters = new Int32Array(32);
var initDOM = document.getElementById('registers').getElementsByClassName('init-value');
initialRegisters[0] = 0; // zero register is hard-wired to 0
for (var i = 1; i < 32; i++) {
var value = parseInt(initDOM[i-1].value) >> 0;
initialRegisters[i] = value;
program.machine.registers.set(i,value);
}
}
var registerSyntactic = [
"$zero", "$at", "$v0", "$v1",
"$a0", "$a1", "$a2", "$a3",
"$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
"$s0", "$s1", "$s2", "$s3", "$s4", "$s5", "$s6", "$s7",
"$t8", "$t9", "$k0", "$k1", "$gp", "$sp", "$fp", "$ra"
];
function getRegisterSyntacticSugar(registerNo) {
if (registerNo < 0 || registerNo > 31) {
console.log("Bad register number: " + registerNo);
return undefined; // no syntactic sugar
}
return registerSyntactic[registerNo]; // no syntactic sugar
}
</script>
<script>
function getUrlVars() {
return getUriVars(window.location.href);
}
function getUriVars(url) {
var vars = {};
console.log(url);
var parts = url.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
vars[key] = value;
});
return vars;
}
var codeVar=getUrlVars()["code"];
if(!(codeVar===undefined)){
//code=JSON.parse(decodeURI(codeVar));
code=(decodeURIComponent(codeVar));
editor.setValue(code);
editor.save();
}else {
if (typeof(Storage) !== "undefined") {
let previousSessionCode = localStorage.getItem("code");
if (previousSessionCode !== null) {
document.getElementById('code').value = previousSessionCode;
}
}
}
if (typeof(Storage) !== "undefined") {
window.onbeforeunload = function() {
editor.save();
localStorage.setItem("code", document.getElementById('code').value);
};
}
</script>
<script src="static/downloader.js"></script>
</body>