blob: 0b89fdebe5982e252423dce40be8c727a5350a97 (
plain) (
tree)
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - linux/ex3.subx</title>
<meta name="Generator" content="Vim/8.1">
<meta name="plugin-version" content="vim8.1_v1">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { font-family: monospace; color: #000000; background-color: #ffffd7; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.subxComment { color: #005faf; }
.subxS2Comment { color: #8a8a8a; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.SpecialChar { color: #d70000; }
.Constant { color: #008787; }
.Normal { color: #000000; background-color: #ffffd7; padding-bottom: 1px; }
-->
</style>
<script type='text/javascript'>
<!--
/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
var lineNum;
lineNum = window.location.hash;
lineNum = lineNum.substr(1); /* strip off '#' */
if (lineNum.indexOf('L') == -1) {
lineNum = 'L'+lineNum;
}
var lineElem = document.getElementById(lineNum);
/* Always jump to new location even if the line was hidden inside a fold, or
* we corrected the raw number to a line ID.
*/
if (lineElem) {
lineElem.scrollIntoView(true);
}
return true;
}
if ('onhashchange' in window) {
window.onhashchange = JumpToLine;
}
-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/main/linux/ex3.subx'>https://github.com/akkartik/mu/blob/main/linux/ex3.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Add the first 10 numbers, and return the result in the exit code.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ bootstrap/bootstrap translate ex3.subx -o ex3</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ bootstrap/bootstrap run ex3</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo $?</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># 55</span>
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr">10 </span>== code
<span id="L11" class="LineNr">11 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L12" class="LineNr">12 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L13" class="LineNr">13 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="SpecialChar">Entry</span>:
<span id="L16" class="LineNr">16 </span> <span class="subxComment"># result: ebx = 0</span>
<span id="L17" class="LineNr">17 </span> bb/copy-to-ebx 0/imm32
<span id="L18" class="LineNr">18 </span> <span class="subxComment"># counter: ecx = 1</span>
<span id="L19" class="LineNr">19 </span> b9/copy-to-ecx 1/imm32
<span id="L20" class="LineNr">20 </span>
<span id="L21" class="LineNr">21 </span><span class="Constant">$loop</span>:
<span id="L22" class="LineNr">22 </span> <span class="subxComment"># if (counter > 10) break</span>
<span id="L23" class="LineNr">23 </span> 81 7/subop/compare 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xa/imm32 <span class="subxComment"># compare ecx</span>
<span id="L24" class="LineNr">24 </span> 7f/jump-if-> $exit/disp8
<span id="L25" class="LineNr">25 </span> <span class="subxComment"># result += counter</span>
<span id="L26" class="LineNr">26 </span> 01/add 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># add ecx to ebx</span>
<span id="L27" class="LineNr">27 </span> <span class="subxComment"># ++counter</span>
<span id="L28" class="LineNr">28 </span> 41/increment-ecx
<span id="L29" class="LineNr">29 </span> <span class="subxComment"># loop</span>
<span id="L30" class="LineNr">30 </span> eb/jump $loop/disp8
<span id="L31" class="LineNr">31 </span>
<span id="L32" class="LineNr">32 </span><span class="Constant">$exit</span>:
<span id="L33" class="LineNr">33 </span> <span class="subxComment"># exit(ebx)</span>
<span id="L34" class="LineNr">34 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32
<span id="L35" class="LineNr">35 </span>
<span id="L36" class="LineNr">36 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|