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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/ex8.subx.html
parenta6517ed821ff39fa56eb3b975799d22497d78a48 (diff)
downloadmu-608a7fa8d0faf9a3e3d182d9eabe969804443aab.tar.gz
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="Comment"># Example reading commandline arguments: compute length of first arg.</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 ex9.subx ex9</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Comment">#   $ subx run ex9 abc de fghi</span>
+<span id="L6" class="LineNr"> 6 </span><span class="Comment"># Expected result:</span>
+<span id="L7" class="LineNr"> 7 </span><span class="Comment">#   $ echo $?</span>
+<span id="L8" class="LineNr"> 8 </span><span class="Comment">#   3  # length of 'abc'</span>
+<span id="L9" class="LineNr"> 9 </span><span class="Comment">#</span>
+<span id="L10" class="LineNr">10 </span><span class="Comment"># At the start of a SubX program:</span>
+<span id="L11" class="LineNr">11 </span><span class="Comment">#   argc: *ESP</span>
+<span id="L12" class="LineNr">12 </span><span class="Comment">#   argv[0]: *(ESP+4)</span>
+<span id="L13" class="LineNr">13 </span><span class="Comment">#   argv[1]: *(ESP+8)</span>
+<span id="L14" class="LineNr">14 </span><span class="Comment">#   ...</span>
+<span id="L15" class="LineNr">15 </span><span class="Comment"># Locals start from ESP-4 downwards.</span>
+<span id="L16" class="LineNr">16 </span>
+<span id="L17" class="LineNr">17 </span>== <a href='031check_operands.cc.html#L14'>code</a>
+<span id="L18" class="LineNr">18 </span><span class="Comment"># instruction                     effective address                                                   operand     displacement    immediate</span>
+<span id="L19" class="LineNr">19 </span><span class="Comment"># op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L20" class="LineNr">20 </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="L21" class="LineNr">21 </span>  <span class="Comment"># var s = argv[1] (EBX)</span>
+<span id="L22" class="LineNr">22 </span>  8b/copy                         1/mod/*+disp8   4/rm32/sib    4/base/ESP  4/index/none              3/r32/EBX   8/disp8        <span class="Delimiter"> . </span>                      <span class="Comment"># copy *(ESP+8) to EBX</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Comment"># call ascii_length(EBX)</span>
+<span id="L24" class="LineNr">24 </span>    <span class="Comment"># prepare call</span>
+<span id="L25" class="LineNr">25 </span>  55/push                        <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># push EBP</span>
+<span id="L26" class="LineNr">26 </span>  89/copy                         3/mod/direct    5/rm32/EBP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          4/r32/ESP  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># copy ESP to EBP</span>
+<span id="L27" class="LineNr">27 </span>    <span class="Comment"># push args</span>
+<span id="L28" class="LineNr">28 </span>  53/push                        <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># push EBX</span>
+<span id="L29" class="LineNr">29 </span>    <span class="Comment"># call</span>
+<span id="L30" class="LineNr">30 </span>  e8/call                        <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>          ascii_length/disp32
+<span id="L31" class="LineNr">31 </span>    <span class="Comment"># discard args</span>
+<span id="L32" class="LineNr">32 </span>  5a/pop                         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># pop into EDX</span>
+<span id="L33" class="LineNr">33 </span>    <span class="Comment"># clean up after call</span>
+<span id="L34" class="LineNr">34 </span>  89/copy                         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          5/r32/EBP  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># copy EBP to ESP</span>
+<span id="L35" class="LineNr">35 </span>  5d/pop                         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># pop to EBP</span>
+<span id="L36" class="LineNr">36 </span>
+<span id="L37" class="LineNr">37 </span>  <span class="Comment"># exit(EAX)</span>
+<span id="L38" class="LineNr">38 </span>  89/copy                         3/mod/direct    3/rm32/EBX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          0/r32/EAX  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># copy EAX to EBX</span>
+<span id="L39" class="LineNr">39 </span>  b8/copy                        <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              1/imm32/exit            <span class="Comment"># copy 1 to EAX</span>
+<span id="L40" class="LineNr">40 </span>  cd/syscall                     <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0x80/imm8               <span class="Comment"># int 80h</span>
+<span id="L41" class="LineNr">41 </span>
+<span id="L42" class="LineNr">42 </span>ascii_length:  <span class="Comment"># (s)</span>
+<span id="L43" class="LineNr">43 </span>  <span class="Comment"># initialize s (EDX)</span>
+<span id="L44" class="LineNr">44 </span>  8b/copy                         1/mod/*+disp8   4/rm32/sib    4/base/ESP  4/index/none              2/r32/EDX   4/disp8                                 <span class="Comment"># copy *(ESP+4) to EDX</span>
+<span id="L45" class="LineNr">45 </span>  <span class="Comment"># var result = 0 (EAX)</span>
+<span id="L46" class="LineNr">46 </span>  b8/copy                        <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0/imm32                 <span class="Comment"># copy 1 to EAX</span>
+<span id="L47" class="LineNr">47 </span>$al_loop:
+<span id="L48" class="LineNr">48 </span>  <span class="Comment"># var c = *s (ECX)</span>
+<span id="L49" class="LineNr">49 </span>  8a/copy                         0/mod/*         2/rm32/EDX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          1/r32/ECX  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                      <span class="Comment"># copy byte at *EDX to lower byte of ECX</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Comment"># if c == '\0' break</span>
+<span id="L51" class="LineNr">51 </span>  81          7/subop/compare     3/mod/direct    1/rm32/ECX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0/imm32                 <span class="Comment"># compare ECX with 0</span>
+<span id="L52" class="LineNr">52 </span>  74/jump-if-zero                <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              $al_ret/disp8           <span class="Comment"># jump if equal</span>
+<span id="L53" class="LineNr">53 </span>  <span class="Comment"># ++s</span>
+<span id="L54" class="LineNr">54 </span>  81          0/subop/add         3/mod/direct    2/rm32/EDX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              1/imm32                 <span class="Comment"># add 1 to EDX</span>
+<span id="L55" class="LineNr">55 </span>  <span class="Comment"># ++result</span>
+<span id="L56" class="LineNr">56 </span>  81          0/subop/add         3/mod/direct    0/rm32/EAX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              1/imm32                 <span class="Comment"># add 1 to EAX</span>
+<span id="L57" class="LineNr">57 </span>  <span class="Comment"># loop</span>
+<span id="L58" class="LineNr">58 </span>  eb/jump                        <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              $al_loop/disp8          <span class="Comment"># jump $al_loop</span>
+<span id="L59" class="LineNr">59 </span>$al_ret:
+<span id="L60" class="LineNr">60 </span>  <span class="Comment"># return (result in EAX)</span>
+<span id="L61" class="LineNr">61 </span>  c3/return
+</pre>
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+<!-- vim: set foldmethod=manual : -->

 

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