84 lines
4.2 KiB
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84 lines
4.2 KiB
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<title>Mu - mu-init.subx</title>
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<a href='https://github.com/akkartik/mu/blob/master/mu-init.subx'>https://github.com/akkartik/mu/blob/master/mu-init.subx</a>
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<pre id='vimCodeElement'>
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<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Initialize the minimal runtime for Mu programs.</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"># See translate_mu for how this file is used.</span>
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<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#</span>
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<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># Mu programs start at a function called 'main' with this signature:</span>
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<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># fn main args: (addr array kernel-string) -> exit-status/ebx: int</span>
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<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># If your program doesn't need commandline arguments you can drop it:</span>
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<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># fn main -> exit-status/ebx: int</span>
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<span id="L9" class="LineNr"> 9 </span><span class="subxComment">#</span>
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<span id="L10" class="LineNr">10 </span><span class="subxComment"># Notice that the output must be in ebx, so that the exit() syscall can pick</span>
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<span id="L11" class="LineNr">11 </span><span class="subxComment"># it up.</span>
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<span id="L12" class="LineNr">12 </span>
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<span id="L13" class="LineNr">13 </span>== code
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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"># we don't use ebp in Entry; just initialize it</span>
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<span id="L17" class="LineNr">17 </span> bd/copy-to-ebp 0/imm32
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<span id="L18" class="LineNr">18 </span> <span class="subxComment"># var args/eax: (addr array kernel-string)</span>
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<span id="L19" class="LineNr">19 </span> 89/<- %eax 4/r32/esp
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<span id="L20" class="LineNr">20 </span> <span class="subxComment"># initialize the heap</span>
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<span id="L21" class="LineNr">21 </span> (<a href='053new-segment.subx.html#L41'>new-segment</a> *<span class="SpecialChar"><a href='069allocate.subx.html#L29'>Heap-size</a></span> <span class="SpecialChar"><a href='069allocate.subx.html#L22'>Heap</a></span>)
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<span id="L22" class="LineNr">22 </span> <span class="subxComment"># run Mu program</span>
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<span id="L23" class="LineNr">23 </span> (<a href='mu-init-test.subx.html#L7'>main</a> %eax)
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<span id="L24" class="LineNr">24 </span> <span class="subxComment"># exit</span>
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<span id="L25" class="LineNr">25 </span> (syscall_exit)
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</pre>
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