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authorKartik Agaram <vc@akkartik.com>2018-09-07 15:08:54 -0700
committerKartik Agaram <vc@akkartik.com>2018-09-07 15:08:54 -0700
commit608a7fa8d0faf9a3e3d182d9eabe969804443aab (patch)
tree7e1934d9ef0e8372381c306312591235c4f27110 /html/subx/examples/ex5.subx.html
parenta6517ed821ff39fa56eb3b975799d22497d78a48 (diff)
downloadmu-608a7fa8d0faf9a3e3d182d9eabe969804443aab.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 - subx/examples/ex5.subx</title>
+<meta name="Generator" content="Vim/8.0">
+<meta name="plugin-version" content="vim7.4_v2">
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+<body onload='JumpToLine();'>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## read a character from stdin, save it to a local on the stack, write it to stdout</span>
+<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span>
+<span id="L3" class="LineNr"> 3 </span><span class="Comment"># To run:</span>
+<span id="L4" class="LineNr"> 4 </span><span class="Comment">#   $ subx translate ex5.subx ex5</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Comment">#   $ subx run ex5</span>
+<span id="L6" class="LineNr"> 6 </span>
+<span id="L7" class="LineNr"> 7 </span>== <a href='031check_operands.cc.html#L14'>code</a>
+<span id="L8" class="LineNr"> 8 </span><span class="Comment"># instruction                     effective address                                                   operand     displacement    immediate</span>
+<span id="L9" class="LineNr"> 9 </span><span class="Comment"># op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L10" class="LineNr">10 </span><span class="Comment"># 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="L11" class="LineNr">11 </span>
+<span id="L12" class="LineNr">12 </span><span class="SalientComment">## function main</span>
+<span id="L13" class="LineNr">13 </span>  <span class="Comment"># prolog</span>
+<span id="L14" class="LineNr">14 </span>  55/push                                                                                                                                           <span class="Comment"># push EBP</span>
+<span id="L15" class="LineNr">15 </span>  89/copy                         3/mod/direct    5/rm32/EBP                                          4/r32/ESP                                     <span class="Comment"># copy ESP to EBP</span>
+<span id="L16" class="LineNr">16 </span>  <span class="Comment"># allocate x on the stack</span>
+<span id="L17" class="LineNr">17 </span>  81          5/subop/subtract    3/mod/direct    4/rm32/ESP                                                                      4/imm32           <span class="Comment"># subtract 4 bytes from ESP</span>
+<span id="L18" class="LineNr">18 </span>
+<span id="L19" class="LineNr">19 </span>  <span class="SalientComment">## read(stdin, x, 1)</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Comment"># fd = 0 (stdin)</span>
+<span id="L21" class="LineNr">21 </span>  bb/copy                                                                                                                         0/imm32           <span class="Comment"># copy 0 to EBX</span>
+<span id="L22" class="LineNr">22 </span>  <span class="Comment"># initialize x (location to write result to)</span>
+<span id="L23" class="LineNr">23 </span>  89/copy                         3/mod/direct    1/rm32/ECX                                          5/r32/EBP                                     <span class="Comment"># copy EBP to ECX</span>
+<span id="L24" class="LineNr">24 </span>  <span class="Comment"># size = 1 character</span>
+<span id="L25" class="LineNr">25 </span>  ba/copy                                                                                                                         1/imm32           <span class="Comment"># copy 1 to EDX</span>
+<span id="L26" class="LineNr">26 </span>  <span class="Comment"># read(fd, x, size)</span>
+<span id="L27" class="LineNr">27 </span>  b8/copy                                                                                                                         3/imm32           <span class="Comment"># copy 3 to EAX</span>
+<span id="L28" class="LineNr">28 </span>  cd/syscall                                                                                                                      0x80/imm8         <span class="Comment"># int 80h</span>
+<span id="L29" class="LineNr">29 </span>
+<span id="L30" class="LineNr">30 </span>  <span class="SalientComment">## write(stdout, x, 1)</span>
+<span id="L31" class="LineNr">31 </span>  <span class="Comment"># fd = 1 (stdout)</span>
+<span id="L32" class="LineNr">32 </span>  bb/copy                                                                                                                         1/imm32           <span class="Comment"># copy 1 to EBX</span>
+<span id="L33" class="LineNr">33 </span>  <span class="Comment"># initialize x (location to read from)</span>
+<span id="L34" class="LineNr">34 </span>  89/copy                         3/mod/direct    1/rm32/ECX                                          5/r32/EBP                                     <span class="Comment"># copy EBP to ECX</span>
+<span id="L35" class="LineNr">35 </span>  <span class="Comment"># size = 1 character</span>
+<span id="L36" class="LineNr">36 </span>  ba/copy                                                                                                                         1/imm32           <span class="Comment"># copy 1 to EDX</span>
+<span id="L37" class="LineNr">37 </span>  <span class="Comment"># write(fd, x, size)</span>
+<span id="L38" class="LineNr">38 </span>  b8/copy                                                                                                                         4/imm32           <span class="Comment"># copy 4 to EAX</span>
+<span id="L39" class="LineNr">39 </span>  cd/syscall                                                                                                                      0x80/imm8         <span class="Comment"># int 80h</span>
+<span id="L40" class="LineNr">40 </span>
+<span id="L41" class="LineNr">41 </span>  <span class="SalientComment">## exit(EBX)</span>
+<span id="L42" class="LineNr">42 </span>  b8/copy                                                                                                                         1/imm32           <span class="Comment"># copy 1 to EAX</span>
+<span id="L43" class="LineNr">43 </span>  cd/syscall                                                                                                                      0x80/imm8         <span class="Comment"># int 80h</span>
+<span id="L44" class="LineNr">44 </span>
+<span id="L45" class="LineNr">45 </span><span class="Comment"># vim&#0058;ft=subx:nowrap</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->

 

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