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authorKartik Agaram <vc@akkartik.com>2018-08-04 17:00:27 -0700
committerKartik Agaram <vc@akkartik.com>2018-08-04 17:00:27 -0700
commitbb2b6ba7fd72bbebc3a4490d090f080e7b8628cc (patch)
tree2a8e0697887f3028b3b9042b62fa57064537bd87 /html/subx/019functions.cc.html
parent6cabcefe67d2cd0583b556129fe3d8c89cf0fcb8 (diff)
downloadmu-bb2b6ba7fd72bbebc3a4490d090f080e7b8628cc.tar.gz
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+<title>Mu - subx/019functions.cc</title>
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+.Comment a { color:#0000ee; text-decoration:underline; }
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">//:: call</span>
+<span id="L2" class="LineNr"> 2 </span>
+<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(before &quot;End Initialize Op Names(name)&quot;)</span>
+<span id="L4" class="LineNr"> 4 </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;e8&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;call disp32&quot;</span><span class="Delimiter">);</span>
+<span id="L5" class="LineNr"> 5 </span>
+<span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(scenario call_disp32)</span>
+<span id="L7" class="LineNr"> 7 </span><span class="Special">% Reg[ESP].u = 0x64;</span>
+<span id="L8" class="LineNr"> 8 </span>== <span class="Constant">0x1</span>
+<span id="L9" class="LineNr"> 9 </span><span class="Comment"># op  ModR/M  SIB   displacement  immediate</span>
+<span id="L10" class="LineNr">10 </span>  e8                              a0 <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>  <span class="Comment"># call function offset at 0x000000a0</span>
+<span id="L11" class="LineNr">11 </span>  <span class="Comment"># next EIP is 6</span>
+<span id="L12" class="LineNr">12 </span><span class="traceContains">+run: call <a href='011run.cc.html#L253'>imm32</a> 0x000000a0</span>
+<span id="L13" class="LineNr">13 </span><span class="traceContains">+run: decrementing <a href='010vm.cc.html#L17'>ESP</a> to 0x00000060</span>
+<span id="L14" class="LineNr">14 </span><span class="traceContains">+run: pushing value 0x00000006</span>
+<span id="L15" class="LineNr">15 </span><span class="traceContains">+run: jumping to 0x000000a6</span>
+<span id="L16" class="LineNr">16 </span>
+<span id="L17" class="LineNr">17 </span><span class="Delimiter">:(before &quot;End Single-Byte Opcodes&quot;)</span>
+<span id="L18" class="LineNr">18 </span><span class="Normal">case</span> <span class="Constant">0xe8</span>: <span class="Delimiter">{</span>  <span class="Comment">// call disp32 relative to next EIP</span>
+<span id="L19" class="LineNr">19 </span>  <span class="Normal">int32_t</span> offset = <a href='011run.cc.html#L253'>imm32</a><span class="Delimiter">();</span>
+<span id="L20" class="LineNr">20 </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;call <a href='011run.cc.html#L253'>imm32</a> 0x&quot;</span> &lt;&lt; <a href='010vm.cc.html#L239'>HEXWORD</a> &lt;&lt; offset &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L21" class="LineNr">21 </span><span class="CommentedCode">//?   cerr &lt;&lt; &quot;push: EIP: &quot; &lt;&lt; EIP &lt;&lt; &quot; =&gt; &quot; &lt;&lt; Reg[ESP].u &lt;&lt; '\n';</span>
+<span id="L22" class="LineNr">22 </span>  <a href='013direct_addressing.cc.html#L371'>push</a><span class="Delimiter">(</span><a href='010vm.cc.html#L29'>EIP</a><span class="Delimiter">);</span>
+<span id="L23" class="LineNr">23 </span>  <a href='010vm.cc.html#L29'>EIP</a> += offset<span class="Delimiter">;</span>
+<span id="L24" class="LineNr">24 </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;jumping to 0x&quot;</span> &lt;&lt; <a href='010vm.cc.html#L239'>HEXWORD</a> &lt;&lt; <a href='010vm.cc.html#L29'>EIP</a> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><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="Delimiter">}</span>
+<span id="L27" class="LineNr">27 </span>
+<span id="L28" class="LineNr">28 </span><span class="Comment">//:</span>
+<span id="L29" class="LineNr">29 </span>
+<span id="L30" class="LineNr">30 </span><span class="Delimiter">:(scenario call_r32)</span>
+<span id="L31" class="LineNr">31 </span><span class="Special">% Reg[ESP].u = 0x64;</span>
+<span id="L32" class="LineNr">32 </span><span class="Special">% Reg[EBX].u = 0x000000a0;</span>
+<span id="L33" class="LineNr">33 </span>== <span class="Constant">0x1</span>
+<span id="L34" class="LineNr">34 </span><span class="Comment"># op  ModR/M  SIB   displacement  immediate</span>
+<span id="L35" class="LineNr">35 </span>  ff  d3                                       <span class="Comment"># call function offset at EBX</span>
+<span id="L36" class="LineNr">36 </span>  <span class="Comment"># next EIP is 3</span>
+<span id="L37" class="LineNr">37 </span><span class="traceContains">+run: call to r/m32</span>
+<span id="L38" class="LineNr">38 </span><span class="traceContains">+run: r/m32 is <a href='010vm.cc.html#L16'>EBX</a></span>
+<span id="L39" class="LineNr">39 </span><span class="traceContains">+run: decrementing <a href='010vm.cc.html#L17'>ESP</a> to 0x00000060</span>
+<span id="L40" class="LineNr">40 </span><span class="traceContains">+run: pushing value 0x00000003</span>
+<span id="L41" class="LineNr">41 </span><span class="traceContains">+run: jumping to 0x000000a3</span>
+<span id="L42" class="LineNr">42 </span>
+<span id="L43" class="LineNr">43 </span><span class="Delimiter">:(before &quot;End Op ff Subops&quot;)</span>
+<span id="L44" class="LineNr">44 </span><span class="Normal">case</span> <span class="Constant">2</span>: <span class="Delimiter">{</span>  <span class="Comment">// call function pointer at r/m32</span>
+<span id="L45" class="LineNr">45 </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;call to r/m32&quot;</span> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Normal">int32_t</span>* offset = <a href='013direct_addressing.cc.html#L31'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
+<span id="L47" class="LineNr">47 </span>  <a href='013direct_addressing.cc.html#L371'>push</a><span class="Delimiter">(</span><a href='010vm.cc.html#L29'>EIP</a><span class="Delimiter">);</span>
+<span id="L48" class="LineNr">48 </span>  <a href='010vm.cc.html#L29'>EIP</a> += *offset<span class="Delimiter">;</span>
+<span id="L49" class="LineNr">49 </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;jumping to 0x&quot;</span> &lt;&lt; <a href='010vm.cc.html#L239'>HEXWORD</a> &lt;&lt; <a href='010vm.cc.html#L29'>EIP</a> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L51" class="LineNr">51 </span><span class="Delimiter">}</span>
+<span id="L52" class="LineNr">52 </span>
+<span id="L53" class="LineNr">53 </span><span class="Delimiter">:(scenario call_mem_at_r32)</span>
+<span id="L54" class="LineNr">54 </span><span class="Special">% Reg[ESP].u = 0x64;</span>
+<span id="L55" class="LineNr">55 </span><span class="Special">% Reg[EBX].u = 0x10;</span>
+<span id="L56" class="LineNr">56 </span>== <span class="Constant">0x1</span>  <span class="Comment"># code segment</span>
+<span id="L57" class="LineNr">57 </span><span class="Comment"># op  ModR/M  SIB   displacement  immediate</span>
+<span id="L58" class="LineNr">58 </span>  ff  <span class="Constant">13</span>                                       <span class="Comment"># call function offset at *EBX</span>
+<span id="L59" class="LineNr">59 </span>  <span class="Comment"># next EIP is 3</span>
+<span id="L60" class="LineNr">60 </span>== <span class="Constant">0x10</span>  <span class="Comment"># data segment</span>
+<span id="L61" class="LineNr">61 </span>a0 <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>  <span class="Comment"># 0xa0</span>
+<span id="L62" class="LineNr">62 </span><span class="traceContains">+run: call to r/m32</span>
+<span id="L63" class="LineNr">63 </span><span class="traceContains">+run: effective address is 0x10 (EBX)</span>
+<span id="L64" class="LineNr">64 </span><span class="traceContains">+run: decrementing <a href='010vm.cc.html#L17'>ESP</a> to 0x00000060</span>
+<span id="L65" class="LineNr">65 </span><span class="traceContains">+run: pushing value 0x00000003</span>
+<span id="L66" class="LineNr">66 </span><span class="traceContains">+run: jumping to 0x000000a3</span>
+<span id="L67" class="LineNr">67 </span>
+<span id="L68" class="LineNr">68 </span><span class="SalientComment">//:: ret</span>
+<span id="L69" class="LineNr">69 </span>
+<span id="L70" class="LineNr">70 </span><span class="Delimiter">:(before &quot;End Initialize Op Names(name)&quot;)</span>
+<span id="L71" class="LineNr">71 </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;c3&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;return from most recent unfinished call&quot;</span><span class="Delimiter">);</span>
+<span id="L72" class="LineNr">72 </span>
+<span id="L73" class="LineNr">73 </span><span class="Delimiter">:(scenario ret)</span>
+<span id="L74" class="LineNr">74 </span><span class="Special">% Reg[ESP].u = 0x60;</span>
+<span id="L75" class="LineNr">75 </span>== <span class="Constant">0x1</span>  <span class="Comment"># code segment</span>
+<span id="L76" class="LineNr">76 </span><span class="Comment"># op  ModR/M  SIB   displacement  immediate</span>
+<span id="L77" class="LineNr">77 </span>  c3
+<span id="L78" class="LineNr">78 </span>== <span class="Constant">0x60</span>  <span class="Comment"># data segment</span>
+<span id="L79" class="LineNr">79 </span><span class="Constant">10</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>  <span class="Comment"># 0x10</span>
+<span id="L80" class="LineNr">80 </span><span class="traceContains">+run: return</span>
+<span id="L81" class="LineNr">81 </span><span class="traceContains">+run: popping value 0x00000010</span>
+<span id="L82" class="LineNr">82 </span><span class="traceContains">+run: jumping to 0x00000010</span>
+<span id="L83" class="LineNr">83 </span>
+<span id="L84" class="LineNr">84 </span><span class="Delimiter">:(before &quot;End Single-Byte Opcodes&quot;)</span>
+<span id="L85" class="LineNr">85 </span><span class="Normal">case</span> <span class="Constant">0xc3</span>: <span class="Delimiter">{</span>  <span class="Comment">// return from a call</span>
+<span id="L86" class="LineNr">86 </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;return&quot;</span> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L87" class="LineNr">87 </span>  <a href='010vm.cc.html#L29'>EIP</a> = <a href='013direct_addressing.cc.html#L419'>pop</a><span class="Delimiter">();</span>
+<span id="L88" class="LineNr">88 </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;jumping to 0x&quot;</span> &lt;&lt; <a href='010vm.cc.html#L239'>HEXWORD</a> &lt;&lt; <a href='010vm.cc.html#L29'>EIP</a> &lt;&lt; <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span>
+<span id="L89" class="LineNr">89 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L90" class="LineNr">90 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->