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authorKartik Agaram <vc@akkartik.com>2021-01-09 19:02:23 -0800
committerKartik Agaram <vc@akkartik.com>2021-01-09 19:02:23 -0800
commit7b109ab6528bfafa6ac8fd9340e5cc0217bcec50 (patch)
tree2c3c383682566d3a04fa270559c1b0f72a2c17c6 /html/baremetal/112read-byte.subx.html
parent3de4d557d5e4686e5be589a8c61b4246f6bab549 (diff)
downloadmu-7b109ab6528bfafa6ac8fd9340e5cc0217bcec50.tar.gz
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+<!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 - baremetal/112read-byte.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: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
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+</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 '#' */
+
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+    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/baremetal/112read-byte.subx'>https://github.com/akkartik/mu/blob/main/baremetal/112read-byte.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># TODO: read-byte-buffered</span>
+<span id="L2" class="LineNr"> 2 </span>
+<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># Return next byte value in eax, with top 3 bytes cleared.</span>
+<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># Abort on reaching end of stream.</span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxFunction">read-byte</span>:  <span class="subxComment"># s: (addr stream byte) -&gt; result/eax: byte</span>
+<span id="L6" class="LineNr"> 6 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L7" class="LineNr"> 7 </span>    55/push-ebp
+<span id="L8" class="LineNr"> 8 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
+<span id="L9" class="LineNr"> 9 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L10" class="LineNr">10 </span>    51/push-ecx
+<span id="L11" class="LineNr">11 </span>    56/push-esi
+<span id="L12" class="LineNr">12 </span>    <span class="subxComment"># esi = s</span>
+<span id="L13" class="LineNr">13 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
+<span id="L14" class="LineNr">14 </span>    <span class="subxComment"># ecx = s-&gt;read</span>
+<span id="L15" class="LineNr">15 </span>    8b/copy                         1/mod/*+disp8   6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(esi+4) to ecx</span>
+<span id="L16" class="LineNr">16 </span>    <span class="subxComment"># if (f-&gt;read &gt;= f-&gt;write) abort</span>
+<span id="L17" class="LineNr">17 </span>    3b/compare                      0/mod/indirect  6/rm32/esi   <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"># compare ecx with *esi</span>
+<span id="L18" class="LineNr">18 </span>    0f 8d/jump-if-&gt;=  $read-byte:end/disp32  <span class="subxComment"># TODO: abort</span>
+<span id="L19" class="LineNr">19 </span>    <span class="subxComment"># result = f-&gt;data[f-&gt;read]</span>
+<span id="L20" class="LineNr">20 </span>    31/xor                          3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear eax</span>
+<span id="L21" class="LineNr">21 </span>    8a/copy-byte                    1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx  <span class="Normal"> . </span>          0/r32/AL    0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *(esi+ecx+12) to AL</span>
+<span id="L22" class="LineNr">22 </span>    <span class="subxComment"># ++f-&gt;read</span>
+<span id="L23" class="LineNr">23 </span>    ff          0/subop/increment   1/mod/*+disp8   6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># increment *(esi+4)</span>
+<span id="L24" class="LineNr">24 </span><span class="Constant">$read-byte:end</span>:
+<span id="L25" class="LineNr">25 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L26" class="LineNr">26 </span>    5e/pop-to-esi
+<span id="L27" class="LineNr">27 </span>    59/pop-to-ecx
+<span id="L28" class="LineNr">28 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L29" class="LineNr">29 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
+<span id="L30" class="LineNr">30 </span>    5d/pop-to-ebp
+<span id="L31" class="LineNr">31 </span>    c3/return
+<span id="L32" class="LineNr">32 </span>
+<span id="L33" class="LineNr">33 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->

 

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