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<a href='https://github.com/akkartik/mu/blob/master/019functions.cc'>https://github.com/akkartik/mu/blob/master/019functions.cc</a>
<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 "End Initialize Op Names")</span>
<span id="L4" class="LineNr"> 4 </span><a href='001help.cc.html#L235'>put_new</a><span class="Delimiter">(</span><span class="SpecialChar"><a href='010vm.cc.html#L355'>Name</a></span><span class="Delimiter">,</span> <span class="Constant">"e8"</span><span class="Delimiter">,</span> <span class="Constant">"call <a href='040tests.cc.html#L82'>disp32</a> (call)"</span><span class="Delimiter">);</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(code)</span>
<span id="L7" class="LineNr"> 7 </span><span class="Normal">void</span> <a href='019functions.cc.html#L7'>test_call_disp32</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L8" class="LineNr"> 8 </span> <span class="SpecialChar"><a href='010vm.cc.html#L163'>Mem</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>vma<span class="Delimiter">(</span><span class="Constant">0xbd000000</span><span class="Delimiter">));</span> <span class="Comment">// manually allocate memory</span>
<span id="L9" class="LineNr"> 9 </span> <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[ESP]<span class="Delimiter">.</span>u = <span class="Constant">0xbd000064</span><span class="Delimiter">;</span>
<span id="L10" class="LineNr"> 10 </span> <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L11" class="LineNr"> 11 </span> <span class="Constant">"== code 0x1\n"</span>
<span id="L12" class="LineNr"> 12 </span> <span class="Comment">// op ModR/M SIB displacement immediate</span>
<span id="L13" class="LineNr"> 13 </span> <span class="Constant">" e8 a0 00 00 00 \n"</span> <span class="Comment">// call function offset at 0x000000a0</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Comment">// next EIP is 6</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Delimiter">);</span>
<span id="L16" class="LineNr"> 16 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L17" class="LineNr"> 17 </span> <span class="Constant">"run: call imm32 0x000000a0\n"</span>
<span id="L18" class="LineNr"> 18 </span> <span class="Constant">"run: decrementing <a href='010vm.cc.html#L14'>ESP</a> to 0xbd000060\n"</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Constant">"run: pushing value 0x00000006\n"</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Constant">"run: jumping to 0x000000a6\n"</span>
<span id="L21" class="LineNr"> 21 </span> <span class="Delimiter">);</span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">}</span>
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L25" class="LineNr"> 25 </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="L26" class="LineNr"> 26 </span> <span class="Normal">const</span> <span class="Normal">int32_t</span> offset = <a href='011run.cc.html#L433'>next32</a><span class="Delimiter">();</span>
<span id="L27" class="LineNr"> 27 </span> ++<span class="SpecialChar">Callstack_depth</span><span class="Delimiter">;</span>
<span id="L28" class="LineNr"> 28 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"call imm32 0x"</span> << <a href='010vm.cc.html#L408'>HEXWORD</a> << offset << end<span class="Delimiter">();</span>
<span id="L29" class="LineNr"> 29 </span><span class="CommentedCode">//? cerr << "push: EIP: " << EIP << " => " << Reg[ESP].u << '\n';</span>
<span id="L30" class="LineNr"> 30 </span> <a href='012elf.cc.html#L94'>push</a><span class="Delimiter">(</span><a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">);</span>
<span id="L31" class="LineNr"> 31 </span> <a href='010vm.cc.html#L26'>EIP</a> += offset<span class="Delimiter">;</span>
<span id="L32" class="LineNr"> 32 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to 0x"</span> << <a href='010vm.cc.html#L408'>HEXWORD</a> << <a href='010vm.cc.html#L26'>EIP</a> << end<span class="Delimiter">();</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L34" class="LineNr"> 34 </span><span class="Delimiter">}</span>
<span id="L35" class="LineNr"> 35 </span>
<span id="L36" class="LineNr"> 36 </span><span class="Comment">//:</span>
<span id="L37" class="LineNr"> 37 </span>
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">:(code)</span>
<span id="L39" class="LineNr"> 39 </span><span class="Normal">void</span> <a href='019functions.cc.html#L39'>test_call_r32</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L40" class="LineNr"> 40 </span> <span class="SpecialChar"><a href='010vm.cc.html#L163'>Mem</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>vma<span class="Delimiter">(</span><span class="Constant">0xbd000000</span><span class="Delimiter">));</span> <span class="Comment">// manually allocate memory</span>
<span id="L41" class="LineNr"> 41 </span> <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[ESP]<span class="Delimiter">.</span>u = <span class="Constant">0xbd000064</span><span class="Delimiter">;</span>
<span id="L42" class="LineNr"> 42 </span> <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u = <span class="Constant">0x000000a0</span><span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span> <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Constant">"== code 0x1\n"</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Comment">// op ModR/M SIB displacement immediate</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Constant">" ff d3 \n"</span> <span class="Comment">// call function offset at EBX</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Comment">// next EIP is 3</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Delimiter">);</span>
<span id="L49" class="LineNr"> 49 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Constant">"run: call to r/m32\n"</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant">"run: r/m32 is EBX\n"</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Constant">"run: decrementing <a href='010vm.cc.html#L14'>ESP</a> to 0xbd000060\n"</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Constant">"run: pushing value 0x00000003\n"</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Constant">"run: jumping to 0x000000a3\n"</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Delimiter">);</span>
<span id="L56" class="LineNr"> 56 </span><span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span>
<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">:(before "End Op ff Subops")</span>
<span id="L59" class="LineNr"> 59 </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="L60" class="LineNr"> 60 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"call to r/m32"</span> << end<span class="Delimiter">();</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Normal">const</span> <span class="Normal">int32_t</span>* offset = <a href='013direct_addressing.cc.html#L101'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L62" class="LineNr"> 62 </span> <a href='012elf.cc.html#L94'>push</a><span class="Delimiter">(</span><a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">);</span>
<span id="L63" class="LineNr"> 63 </span> <a href='010vm.cc.html#L26'>EIP</a> += *offset<span class="Delimiter">;</span>
<span id="L64" class="LineNr"> 64 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to 0x"</span> << <a href='010vm.cc.html#L408'>HEXWORD</a> << <a href='010vm.cc.html#L26'>EIP</a> << end<span class="Delimiter">();</span>
<span id="L65" class="LineNr"> 65 </span> ++<span class="SpecialChar">Callstack_depth</span><span class="Delimiter">;</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L67" class="LineNr"> 67 </span><span class="Delimiter">}</span>
<span id="L68" class="LineNr"> 68 </span>
<span id="L69" class="LineNr"> 69 </span><span class="Delimiter">:(code)</span>
<span id="L70" class="LineNr"> 70 </span><span class="Normal">void</span> <a href='019functions.cc.html#L70'>test_call_mem_at_r32</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L71" class="LineNr"> 71 </span> <span class="SpecialChar"><a href='010vm.cc.html#L163'>Mem</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>vma<span class="Delimiter">(</span><span class="Constant">0xbd000000</span><span class="Delimiter">));</span> <span class="Comment">// manually allocate memory</span>
<span id="L72" class="LineNr"> 72 </span> <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[ESP]<span class="Delimiter">.</span>u = <span class="Constant">0xbd000064</span><span class="Delimiter">;</span>
<span id="L73" class="LineNr"> 73 </span> <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u = <span class="Constant">0x2000</span><span class="Delimiter">;</span>
<span id="L74" class="LineNr"> 74 </span> <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Constant">"== code 0x1\n"</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> <span class="Constant">" ff 13 \n"</span> <span class="Comment">// call function offset at *EBX</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Comment">// next EIP is 3</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Constant">"== data 0x2000\n"</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Constant">"a0 00 00 00\n"</span> <span class="Comment">// 0x000000a0</span>
<span id="L81" class="LineNr"> 81 </span> <span class="Delimiter">);</span>
<span id="L82" class="LineNr"> 82 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Constant">"run: call to r/m32\n"</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Constant">"run: effective address is 0x00002000 (<a href='010vm.cc.html#L13'>EBX</a>)\n"</span>
<span id="L85" class="LineNr"> 85 </span> <span class="Constant">"run: decrementing <a href='010vm.cc.html#L14'>ESP</a> to 0xbd000060\n"</span>
<span id="L86" class="LineNr"> 86 </span> <span class="Constant">"run: pushing value 0x00000003\n"</span>
<span id="L87" class="LineNr"> 87 </span> <span class="Constant">"run: jumping to 0x000000a3\n"</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Delimiter">);</span>
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">}</span>
<span id="L90" class="LineNr"> 90 </span>
<span id="L91" class="LineNr"> 91 </span><span class="SalientComment">//:: ret</span>
<span id="L92" class="LineNr"> 92 </span>
<span id="L93" class="LineNr"> 93 </span><span class="Delimiter">:(before "End Initialize Op Names")</span>
<span id="L94" class="LineNr"> 94 </span><a href='001help.cc.html#L235'>put_new</a><span class="Delimiter">(</span><span class="SpecialChar"><a href='010vm.cc.html#L355'>Name</a></span><span class="Delimiter">,</span> <span class="Constant">"c3"</span><span class="Delimiter">,</span> <span class="Constant">"return from most recent unfinished call (<a href='040tests.cc.html#L89'>ret</a>)"</span><span class="Delimiter">);</span>
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="Delimiter">:(code)</span>
<span id="L97" class="LineNr"> 97 </span><span class="Normal">void</span> <a href='019functions.cc.html#L97'>test_ret</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L98" class="LineNr"> 98 </span> <span class="SpecialChar"><a href='010vm.cc.html#L163'>Mem</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>vma<span class="Delimiter">(</span><span class="Constant">0xbd000000</span><span class="Delimiter">));</span> <span class="Comment">// manually allocate memory</span>
<span id="L99" class="LineNr"> 99 </span> <span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[ESP]<span class="Delimiter">.</span>u = <span class="Constant">0xbd000064</span><span class="Delimiter">;</span>
<span id="L100" class="LineNr">100 </span> <a href='010vm.cc.html#L252'>write_mem_u32</a><span class="Delimiter">(</span><span class="SpecialChar"><a href='010vm.cc.html#L25'>Reg</a></span>[ESP]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Constant">0x10</span><span class="Delimiter">);</span>
<span id="L101" class="LineNr">101 </span> <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L102" class="LineNr">102 </span> <span class="Constant">"== code 0x1\n"</span>
<span id="L103" class="LineNr">103 </span> <span class="Comment">// op ModR/M SIB displacement immediate</span>
<span id="L104" class="LineNr">104 </span> <span class="Constant">" c3 \n"</span> <span class="Comment">// return</span>
<span id="L105" class="LineNr">105 </span> <span class="Constant">"== data 0x2000\n"</span>
<span id="L106" class="LineNr">106 </span> <span class="Constant">"10 00 00 00\n"</span> <span class="Comment">// 0x00000010</span>
<span id="L107" class="LineNr">107 </span> <span class="Delimiter">);</span>
<span id="L108" class="LineNr">108 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L109" class="LineNr">109 </span> <span class="Constant">"run: return\n"</span>
<span id="L110" class="LineNr">110 </span> <span class="Constant">"run: popping value 0x00000010\n"</span>
<span id="L111" class="LineNr">111 </span> <span class="Constant">"run: jumping to 0x00000010\n"</span>
<span id="L112" class="LineNr">112 </span> <span class="Delimiter">);</span>
<span id="L113" class="LineNr">113 </span><span class="Delimiter">}</span>
<span id="L114" class="LineNr">114 </span>
<span id="L115" class="LineNr">115 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L116" class="LineNr">116 </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="L117" class="LineNr">117 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"return"</span> << end<span class="Delimiter">();</span>
<span id="L118" class="LineNr">118 </span> --<span class="SpecialChar">Callstack_depth</span><span class="Delimiter">;</span>
<span id="L119" class="LineNr">119 </span> <a href='010vm.cc.html#L26'>EIP</a> = <a href='013direct_addressing.cc.html#L1270'>pop</a><span class="Delimiter">();</span>
<span id="L120" class="LineNr">120 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="SpecialChar">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to 0x"</span> << <a href='010vm.cc.html#L408'>HEXWORD</a> << <a href='010vm.cc.html#L26'>EIP</a> << end<span class="Delimiter">();</span>
<span id="L121" class="LineNr">121 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L122" class="LineNr">122 </span><span class="Delimiter">}</span>
</pre>
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