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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="Delimiter">:(before &quot;End Initialize Op Names(name)&quot;)</span>
+<span id="L2" class="LineNr"> 2 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='010vm.cc.html#L207'>name</a><span class="Delimiter">,</span> <span class="Constant">&quot;cd&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;software interrupt&quot;</span><span class="Delimiter">);</span>
+<span id="L3" class="LineNr"> 3 </span>
+<span id="L4" class="LineNr"> 4 </span><span class="Delimiter">:(before &quot;End Single-Byte Opcodes&quot;)</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Normal">case</span> <span class="Constant">0xcd</span>: <span class="Delimiter">{</span>  <span class="Comment">// int imm8 (software interrupt)</span>
+<span id="L6" class="LineNr"> 6 </span>  <a href='003trace.cc.html#L190'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;syscall&quot;</span> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L7" class="LineNr"> 7 </span>  <span class="Normal">uint8_t</span> code = <a href='010vm.cc.html#L193'>next</a><span class="Delimiter">();</span>
+<span id="L8" class="LineNr"> 8 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>code != <span class="Constant">0x80</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L9" class="LineNr"> 9 </span>    <a href='003trace.cc.html#L197'>raise</a> &lt;&lt; <span class="Constant">&quot;Unimplemented interrupt code &quot;</span> &lt;&lt; <a href='010vm.cc.html#L238'>HEXBYTE</a> &lt;&lt; code &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L10" class="LineNr">10 </span>    <a href='003trace.cc.html#L197'>raise</a> &lt;&lt; <span class="Constant">&quot;  Only `int 80h` supported for now.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L11" class="LineNr">11 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L12" class="LineNr">12 </span>  <span class="Delimiter">}</span>
+<span id="L13" class="LineNr">13 </span>  <a href='020syscalls.cc.html#L18'>process_int80</a><span class="Delimiter">();</span>
+<span id="L14" class="LineNr">14 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L15" class="LineNr">15 </span><span class="Delimiter">}</span>
+<span id="L16" class="LineNr">16 </span>
+<span id="L17" class="LineNr">17 </span><span class="Delimiter">:(code)</span>
+<span id="L18" class="LineNr">18 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L18'>process_int80</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L19" class="LineNr">19 </span>  <span class="Normal">switch</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Normal">case</span> <span class="Constant">1</span>:
+<span id="L21" class="LineNr">21 </span>    exit<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">exit code</span><span class="Comment">*/</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
+<span id="L22" class="LineNr">22 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Normal">case</span> <span class="Constant">3</span>:
+<span id="L24" class="LineNr">24 </span>    Reg[EAX]<span class="Delimiter">.</span>i = read<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">file descriptor</span><span class="Comment">*/</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">memory buffer</span><span class="Comment">*/</span><a href='010vm.cc.html#L117'>mem_addr_u8</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">size</span><span class="Comment">*/</span>Reg[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
+<span id="L25" class="LineNr">25 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L26" class="LineNr">26 </span>  <span class="Normal">case</span> <span class="Constant">4</span>:
+<span id="L27" class="LineNr">27 </span>    Reg[EAX]<span class="Delimiter">.</span>i = write<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">file descriptor</span><span class="Comment">*/</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">memory buffer</span><span class="Comment">*/</span><a href='010vm.cc.html#L117'>mem_addr_u8</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">size</span><span class="Comment">*/</span>Reg[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
+<span id="L28" class="LineNr">28 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L29" class="LineNr">29 </span>  <span class="Normal">default</span>:
+<span id="L30" class="LineNr">30 </span>    <a href='003trace.cc.html#L197'>raise</a> &lt;&lt; <a href='010vm.cc.html#L239'>HEXWORD</a> &lt;&lt; <a href='010vm.cc.html#L29'>EIP</a> &lt;&lt; <span class="Constant">&quot;: unimplemented syscall &quot;</span> &lt;&lt; Reg[EAX]<span class="Delimiter">.</span>u &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L31" class="LineNr">31 </span>  <span class="Delimiter">}</span>
+<span id="L32" class="LineNr">32 </span><span class="Delimiter">}</span>
+</pre>
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