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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - linux/ex6.subx</title>
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<a href='https://github.com/akkartik/mu/blob/main/linux/ex6.subx'>https://github.com/akkartik/mu/blob/main/linux/ex6.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Print out a (global variable) string to stdout.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ bootstrap/bootstrap translate ex6.subx -o ex6</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ bootstrap/bootstrap run ex6</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Hello, world!</span>
<span id="L7" class="LineNr"> 7 </span>
<span id="L8" class="LineNr"> 8 </span>== code
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr">10 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L11" class="LineNr">11 </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="L12" class="LineNr">12 </span>
<span id="L13" class="LineNr">13 </span><span class="SpecialChar">Entry</span>:
<span id="L14" class="LineNr">14 </span> <span class="subxComment"># write(stdout, X, Size)</span>
<span id="L15" class="LineNr">15 </span> <span class="subxS1Comment"># . fd = 1 (stdout)</span>
<span id="L16" class="LineNr">16 </span> bb/copy-to-ebx 1/imm32
<span id="L17" class="LineNr">17 </span> <span class="subxS1Comment"># . initialize X (location to write result to)</span>
<span id="L18" class="LineNr">18 </span> b9/copy-to-ecx <span class="SpecialChar"><a href='ex6.subx.html#L31'>X</a></span>/imm32
<span id="L19" class="LineNr">19 </span> <span class="subxS1Comment"># . initialize Size</span>
<span id="L20" class="LineNr">20 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/edx <span class="SpecialChar"><a href='ex6.subx.html#L29'>Size</a></span>/disp32 <span class="Normal"> . </span> <span class="subxComment"># copy *Size to edx</span>
<span id="L21" class="LineNr">21 </span> <span class="subxS1Comment"># . syscall</span>
<span id="L22" class="LineNr">22 </span> e8/call <a href='000init.subx.html#L29'>syscall_write</a>/disp32
<span id="L23" class="LineNr">23 </span>
<span id="L24" class="LineNr">24 </span> <span class="subxComment"># exit(ebx)</span>
<span id="L25" class="LineNr">25 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32
<span id="L26" class="LineNr">26 </span>
<span id="L27" class="LineNr">27 </span>== data
<span id="L28" class="LineNr">28 </span>
<span id="L29" class="LineNr">29 </span><span class="SpecialChar">Size</span>: <span class="subxComment"># size of string</span>
<span id="L30" class="LineNr">30 </span> 0x0d/imm32 <span class="subxComment"># 13</span>
<span id="L31" class="LineNr">31 </span><span class="SpecialChar">X</span>: <span class="subxComment"># string to print</span>
<span id="L32" class="LineNr">32 </span> 48 65 6c 6c 6f 20 77 6f 72 6c 64 21 0a 00
<span id="L33" class="LineNr">33 </span><span class="subxComment"># H e l l o ␣ w o r l d ! newline null</span>
<span id="L34" class="LineNr">34 </span>
<span id="L35" class="LineNr">35 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
</pre>
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