99 lines
5.6 KiB
HTML
99 lines
5.6 KiB
HTML
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<title>Mu - linux/ex3.subx</title>
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<a href='https://github.com/akkartik/mu/blob/main/linux/ex3.subx'>https://github.com/akkartik/mu/blob/main/linux/ex3.subx</a>
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<pre id='vimCodeElement'>
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<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Add the first 10 numbers, and return the result in the exit code.</span>
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<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
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<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span>
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<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ bootstrap/bootstrap translate ex3.subx -o ex3</span>
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<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ bootstrap/bootstrap run ex3</span>
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<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span>
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<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo $?</span>
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<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># 55</span>
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<span id="L9" class="LineNr"> 9 </span>
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<span id="L10" class="LineNr">10 </span>== code
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<span id="L11" class="LineNr">11 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
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<span id="L12" class="LineNr">12 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
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<span id="L13" class="LineNr">13 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
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<span id="L14" class="LineNr">14 </span>
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<span id="L15" class="LineNr">15 </span><span class="SpecialChar">Entry</span>:
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<span id="L16" class="LineNr">16 </span> <span class="subxComment"># result: ebx = 0</span>
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<span id="L17" class="LineNr">17 </span> bb/copy-to-ebx 0/imm32
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<span id="L18" class="LineNr">18 </span> <span class="subxComment"># counter: ecx = 1</span>
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<span id="L19" class="LineNr">19 </span> b9/copy-to-ecx 1/imm32
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<span id="L20" class="LineNr">20 </span>
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<span id="L21" class="LineNr">21 </span><span class="Constant">$loop</span>:
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<span id="L22" class="LineNr">22 </span> <span class="subxComment"># if (counter > 10) break</span>
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<span id="L23" class="LineNr">23 </span> 81 7/subop/compare 3/mod/direct 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xa/imm32 <span class="subxComment"># compare ecx</span>
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<span id="L24" class="LineNr">24 </span> 7f/jump-if-> $exit/disp8
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<span id="L25" class="LineNr">25 </span> <span class="subxComment"># result += counter</span>
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<span id="L26" class="LineNr">26 </span> 01/add 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># add ecx to ebx</span>
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<span id="L27" class="LineNr">27 </span> <span class="subxComment"># ++counter</span>
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<span id="L28" class="LineNr">28 </span> 41/increment-ecx
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<span id="L29" class="LineNr">29 </span> <span class="subxComment"># loop</span>
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<span id="L30" class="LineNr">30 </span> eb/jump $loop/disp8
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<span id="L31" class="LineNr">31 </span>
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<span id="L32" class="LineNr">32 </span><span class="Constant">$exit</span>:
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<span id="L33" class="LineNr">33 </span> <span class="subxComment"># exit(ebx)</span>
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<span id="L34" class="LineNr">34 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32
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<span id="L35" class="LineNr">35 </span>
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<span id="L36" class="LineNr">36 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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</pre>
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