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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/115write-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/115write-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=">
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+* { font-size:12pt; font-size: 1em; }
+.subxComment { color: #005faf; }
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+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/115write-byte.subx'>https://github.com/akkartik/mu/blob/main/baremetal/115write-byte.subx</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L2" class="LineNr"> 2 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L3" class="LineNr"> 3 </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="L4" class="LineNr"> 4 </span>
+<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># Write lower byte of 'n' to 'f'.</span>
+<span id="L6" class="LineNr"> 6 </span><span class="subxFunction">append-byte</span>:  <span class="subxComment"># f: (addr stream byte), n: int</span>
+<span id="L7" class="LineNr"> 7 </span>    <span class="subxS1Comment"># . prologue</span>
+<span id="L8" class="LineNr"> 8 </span>    55/push-ebp
+<span id="L9" class="LineNr"> 9 </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="L10" class="LineNr">10 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L11" class="LineNr">11 </span>    51/push-ecx
+<span id="L12" class="LineNr">12 </span>    57/push-edi
+<span id="L13" class="LineNr">13 </span>    <span class="subxComment"># edi = f</span>
+<span id="L14" class="LineNr">14 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to edi</span>
+<span id="L15" class="LineNr">15 </span>    <span class="subxComment"># ecx = f-&gt;write</span>
+<span id="L16" class="LineNr">16 </span>    8b/copy                         0/mod/indirect  7/rm32/edi   <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"># copy *edi to ecx</span>
+<span id="L17" class="LineNr">17 </span>    <span class="subxComment"># if (f-&gt;write &gt;= f-&gt;size) abort</span>
+<span id="L18" class="LineNr">18 </span>    3b/compare                      1/mod/*+disp8   7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># compare ecx with *(edi+8)</span>
+<span id="L19" class="LineNr">19 </span>    7d/jump-if-&gt;=  $append-byte:end/disp8  <span class="subxComment"># TODO: abort</span>
+<span id="L20" class="LineNr">20 </span><span class="Constant">$append-byte:to-stream</span>:
+<span id="L21" class="LineNr">21 </span>    <span class="subxComment"># write to stream</span>
+<span id="L22" class="LineNr">22 </span>    <span class="subxComment"># f-&gt;data[f-&gt;write] = LSB(n)</span>
+<span id="L23" class="LineNr">23 </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="L24" class="LineNr">24 </span>    8a/copy-byte                    1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/AL    0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *(ebp+12) to AL</span>
+<span id="L25" class="LineNr">25 </span>    88/copy-byte                    1/mod/*+disp8   4/rm32/sib    7/base/edi  1/index/ecx  <span class="Normal"> . </span>          0/r32/AL    0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy AL to *(edi+ecx+12)</span>
+<span id="L26" class="LineNr">26 </span>    <span class="subxComment"># ++f-&gt;write</span>
+<span id="L27" class="LineNr">27 </span>    ff          0/subop/increment   0/mod/indirect  7/rm32/edi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># increment *edi</span>
+<span id="L28" class="LineNr">28 </span><span class="Constant">$append-byte:end</span>:
+<span id="L29" class="LineNr">29 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L30" class="LineNr">30 </span>    5f/pop-to-edi
+<span id="L31" class="LineNr">31 </span>    59/pop-to-ecx
+<span id="L32" class="LineNr">32 </span>    <span class="subxS1Comment"># . epilogue</span>
+<span id="L33" class="LineNr">33 </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="L34" class="LineNr">34 </span>    5d/pop-to-ebp
+<span id="L35" class="LineNr">35 </span>    c3/return
+<span id="L36" class="LineNr">36 </span>
+<span id="L37" class="LineNr">37 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->

 

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