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<!DOCTYPE html>
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<title>Mu - linux/apps/ex13.subx</title>
<meta name="Generator" content="Vim/8.2">
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<a href='https://github.com/akkartik/mu/blob/main/linux/apps/ex13.subx'>https://github.com/akkartik/mu/blob/main/linux/apps/ex13.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Compare 3 and 3.</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 apps/ex13.subx -o ex13</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ bootstrap/bootstrap run ex13</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo $?</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># 1</span>
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr">10 </span>== code
<span id="L11" class="LineNr">11 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L12" class="LineNr">12 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L13" class="LineNr">13 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="SpecialChar">Entry</span>:
<span id="L16" class="LineNr">16 </span> b8/copy-to-eax 3/imm32
<span id="L17" class="LineNr">17 </span> 3d/compare-eax-and 3/imm32
<span id="L18" class="LineNr">18 </span> 0f 94/set-if-= 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># set ebx to ZF</span>
<span id="L19" class="LineNr">19 </span> 81 4/subop/and 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xff/imm32 <span class="subxComment"># AND with eax</span>
<span id="L20" class="LineNr">20 </span>
<span id="L21" class="LineNr">21 </span><span class="Constant">$exit</span>:
<span id="L22" class="LineNr">22 </span> <span class="subxComment"># exit(ebx)</span>
<span id="L23" class="LineNr">23 </span> e8/call <a href='../000init.subx.html#L18'>syscall_exit</a>/disp32
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
</pre>
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