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authorKartik Agaram <vc@akkartik.com>2018-10-02 01:21:01 -0700
committerKartik Agaram <vc@akkartik.com>2018-10-02 01:21:32 -0700
commit5a2cb154eb016aa8b84ad939f63eb56dd7a0a90f (patch)
tree61701a7d8ec8bba5d9b7d5fc2d2e1496b74c5a0c /html/subx/examples/ex12.subx.html
parent29ab43973a2e9822d84b564e314b4af5c58c4684 (diff)
downloadmu-5a2cb154eb016aa8b84ad939f63eb56dd7a0a90f.tar.gz
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+<title>Mu - subx/examples/ex12.subx</title>
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## example showing mmap syscall</span>
+<span id="L2" class="LineNr"> 2 </span><span class="Comment"># Create a new segment using mmap, save the address, write to it.</span>
+<span id="L3" class="LineNr"> 3 </span><span class="Comment">#</span>
+<span id="L4" class="LineNr"> 4 </span><span class="Comment"># To run (from the subx directory):</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Comment">#   $ subx translate examples/ex12.subx -o examples/ex12</span>
+<span id="L6" class="LineNr"> 6 </span><span class="Comment">#   $ subx run examples/ex12</span>
+<span id="L7" class="LineNr"> 7 </span><span class="Comment"># You shouldn't get a segmentation fault.</span>
+<span id="L8" class="LineNr"> 8 </span>
+<span id="L9" class="LineNr"> 9 </span>== code
+<span id="L10" class="LineNr">10 </span><span class="Comment"># instruction                     effective address                                                   operand     displacement    immediate</span>
+<span id="L11" class="LineNr">11 </span><span class="Comment"># op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L12" class="LineNr">12 </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="L13" class="LineNr">13 </span>
+<span id="L14" class="LineNr">14 </span>  <span class="Comment"># mmap(0x1000)</span>
+<span id="L15" class="LineNr">15 </span>  bb/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>              mmap_new_segment/imm32  <span class="Comment"># copy to EBX</span>
+<span id="L16" class="LineNr">16 </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>              0x5a/imm32/mmap         <span class="Comment"># copy to EAX</span>
+<span id="L17" class="LineNr">17 </span>  cd/syscall  0x80/imm8
+<span id="L18" class="LineNr">18 </span>
+<span id="L19" class="LineNr">19 </span>  <span class="Comment"># store to *EAX</span>
+<span id="L20" class="LineNr">20 </span>  c7/copy                         0/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>              0x34/imm32              <span class="Comment"># copy to *EAX</span>
+<span id="L21" class="LineNr">21 </span>
+<span id="L22" class="LineNr">22 </span>  <span class="Comment"># exit(EAX)</span>
+<span id="L23" class="LineNr">23 </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="L24" class="LineNr">24 </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 to EAX</span>
+<span id="L25" class="LineNr">25 </span>  cd/syscall  0x80/imm8
+<span id="L26" class="LineNr">26 </span>
+<span id="L27" class="LineNr">27 </span>== data
+<span id="L28" class="LineNr">28 </span><span class="Comment"># various constants used here were found in the Linux sources (search for file mman-common.h)</span>
+<span id="L29" class="LineNr">29 </span>mmap_new_segment:  <span class="Comment"># type mmap_arg_struct</span>
+<span id="L30" class="LineNr">30 </span>  <span class="Comment"># addr</span>
+<span id="L31" class="LineNr">31 </span>  00 00 00 00  <span class="Comment"># null</span>
+<span id="L32" class="LineNr">32 </span>  <span class="Comment"># len</span>
+<span id="L33" class="LineNr">33 </span>  00 01 00 00  <span class="Comment"># 0x1000</span>
+<span id="L34" class="LineNr">34 </span>  <span class="Comment"># protection flags</span>
+<span id="L35" class="LineNr">35 </span>  03 00 00 00  <span class="Comment"># PROT_READ | PROT_WRITE</span>
+<span id="L36" class="LineNr">36 </span>  <span class="Comment"># sharing flags</span>
+<span id="L37" class="LineNr">37 </span>  22 00 00 00  <span class="Comment"># MAP_PRIVATE | MAP_ANONYMOUS</span>
+<span id="L38" class="LineNr">38 </span>  <span class="Comment"># fd</span>
+<span id="L39" class="LineNr">39 </span>  ff ff ff ff  <span class="Comment"># -1 since MAP_ANONYMOUS is specified</span>
+<span id="L40" class="LineNr">40 </span>  <span class="Comment"># offset</span>
+<span id="L41" class="LineNr">41 </span>  00 00 00 00  <span class="Comment"># 0 since MAP_ANONYMOUS is specified</span>
+<span id="L42" class="LineNr">42 </span>
+<span id="L43" class="LineNr">43 </span><span class="Comment"># vim&#0058;ft=subx:nowrap:tw&amp;</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->

 

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