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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: operating directly on a register</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(scenario add_r32_to_r32)</span>
<span id="L4" class="LineNr"> 4 </span><span class="Special">% Reg[0].i = 0x10;</span>
<span id="L5" class="LineNr"> 5 </span><span class="Special">% Reg[3].i = 1;</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L7" class="LineNr"> 7 </span> <span class="PreProc">0</span><span class="Constant">1</span> d8 <span class="Comment"># add EBX (reg 3) to EAX (reg 0)</span>
<span id="L8" class="LineNr"> 8 </span><span class="traceContains">+run: add <a href='010core.cc.html#L17'>reg</a> 3 to effective address</span>
<span id="L9" class="LineNr"> 9 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L10" class="LineNr"> 10 </span><span class="traceContains">+run: storing 0x00000011</span>
<span id="L11" class="LineNr"> 11 </span>
<span id="L12" class="LineNr"> 12 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L13" class="LineNr"> 13 </span><span class="Normal">case</span> <span class="Constant">0x01</span>: <span class="Delimiter">{</span> <span class="Comment">// add r32 to r/m32</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L16" class="LineNr"> 16 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"add <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" to effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L17" class="LineNr"> 17 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L18" class="LineNr"> 18 </span> <a href='010core.cc.html#L43'>BINARY_ARITHMETIC_OP</a><span class="Delimiter">(</span>+<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span>i<span class="Delimiter">);</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L20" class="LineNr"> 20 </span><span class="Delimiter">}</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">:(code)</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">// Implement tables 2-2 and 2-3 in the Intel manual, Volume 2.</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment">// We return a pointer so that instructions can write to multiple bytes in</span>
<span id="L25" class="LineNr"> 25 </span><span class="Comment">// 'Mem' at once.</span>
<span id="L26" class="LineNr"> 26 </span><span class="Normal">int32_t</span>* <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span> modrm<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Normal">uint8_t</span> mod = <span class="Delimiter">(</span>modrm>><span class="Constant">6</span><span class="Delimiter">);</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Comment">// ignore middle 3 'reg opcode' bits</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Normal">uint8_t</span> rm = modrm & <span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L30" class="LineNr"> 30 </span> <span class="Normal">int32_t</span>* result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Normal">switch</span> <span class="Delimiter">(</span>mod<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Normal">case</span> <span class="Constant">3</span>:
<span id="L33" class="LineNr"> 33 </span> <span class="Conceal">¦</span> <span class="Comment">// mod 3 is just register direct addressing</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"effective address is <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>rm<span class="Delimiter">)</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Conceal">¦</span> result = &Reg[rm]<span class="Delimiter">.</span>i<span class="Delimiter">;</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Comment">// End Mod Special-cases</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Normal">default</span>:
<span id="L39" class="LineNr"> 39 </span> <span class="Conceal">¦</span> cerr << <span class="Constant">"unrecognized mod bits: "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>mod<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span><span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span>
<span id="L45" class="LineNr"> 45 </span><span class="SalientComment">//:: subtract</span>
<span id="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span><span class="Delimiter">:(scenario subtract_r32_from_r32)</span>
<span id="L48" class="LineNr"> 48 </span><span class="Special">% Reg[0].i = 10;</span>
<span id="L49" class="LineNr"> 49 </span><span class="Special">% Reg[3].i = 1;</span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant">29</span> d8 <span class="Comment"># subtract EBX (reg 3) from EAX (reg 0)</span>
<span id="L52" class="LineNr"> 52 </span><span class="traceContains">+run: subtract <a href='010core.cc.html#L17'>reg</a> 3 from effective address</span>
<span id="L53" class="LineNr"> 53 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L54" class="LineNr"> 54 </span><span class="traceContains">+run: storing 0x00000009</span>
<span id="L55" class="LineNr"> 55 </span>
<span id="L56" class="LineNr"> 56 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L57" class="LineNr"> 57 </span><span class="Normal">case</span> <span class="Constant">0x29</span>: <span class="Delimiter">{</span> <span class="Comment">// subtract r32 from r/m32</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L60" class="LineNr"> 60 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"subtract <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" from effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L62" class="LineNr"> 62 </span> <a href='010core.cc.html#L43'>BINARY_ARITHMETIC_OP</a><span class="Delimiter">(</span>-<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span>i<span class="Delimiter">);</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L64" class="LineNr"> 64 </span><span class="Delimiter">}</span>
<span id="L65" class="LineNr"> 65 </span>
<span id="L66" class="LineNr"> 66 </span><span class="SalientComment">//:: and</span>
<span id="L67" class="LineNr"> 67 </span>
<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">:(scenario and_r32_with_r32)</span>
<span id="L69" class="LineNr"> 69 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L70" class="LineNr"> 70 </span><span class="Special">% Reg[3].i = 0x000000ff;</span>
<span id="L71" class="LineNr"> 71 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Constant">21</span> d8 <span class="Comment"># and EBX (reg 3) with destination EAX (reg 0)</span>
<span id="L73" class="LineNr"> 73 </span><span class="traceContains">+run: and <a href='010core.cc.html#L17'>reg</a> 3 with effective address</span>
<span id="L74" class="LineNr"> 74 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L75" class="LineNr"> 75 </span><span class="traceContains">+run: storing 0x0000000d</span>
<span id="L76" class="LineNr"> 76 </span>
<span id="L77" class="LineNr"> 77 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L78" class="LineNr"> 78 </span><span class="Normal">case</span> <span class="Constant">0x21</span>: <span class="Delimiter">{</span> <span class="Comment">// and r32 with r/m32</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L81" class="LineNr"> 81 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"and <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L83" class="LineNr"> 83 </span> <a href='010core.cc.html#L55'>BINARY_BITWISE_OP</a><span class="Delimiter">(</span>&<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L85" class="LineNr"> 85 </span><span class="Delimiter">}</span>
<span id="L86" class="LineNr"> 86 </span>
<span id="L87" class="LineNr"> 87 </span><span class="SalientComment">//:: or</span>
<span id="L88" class="LineNr"> 88 </span>
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">:(scenario or_r32_with_r32)</span>
<span id="L90" class="LineNr"> 90 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L91" class="LineNr"> 91 </span><span class="Special">% Reg[3].i = 0xa0b0c0d0;</span>
<span id="L92" class="LineNr"> 92 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Error">09</span> d8 <span class="Comment"># or EBX (reg 3) with destination EAX (reg 0)</span>
<span id="L94" class="LineNr"> 94 </span><span class="traceContains">+run: or <a href='010core.cc.html#L17'>reg</a> 3 with effective address</span>
<span id="L95" class="LineNr"> 95 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L96" class="LineNr"> 96 </span><span class="traceContains">+run: storing 0xaabbccdd</span>
<span id="L97" class="LineNr"> 97 </span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L99" class="LineNr"> 99 </span><span class="Normal">case</span> <span class="Constant">0x09</span>: <span class="Delimiter">{</span> <span class="Comment">// or r32 with r/m32</span>
<span id="L100" class="LineNr">100 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L101" class="LineNr">101 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L102" class="LineNr">102 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"or <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L103" class="LineNr">103 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L104" class="LineNr">104 </span> <a href='010core.cc.html#L55'>BINARY_BITWISE_OP</a><span class="Delimiter">(</span>|<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L106" class="LineNr">106 </span><span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span>
<span id="L108" class="LineNr">108 </span><span class="SalientComment">//:: xor</span>
<span id="L109" class="LineNr">109 </span>
<span id="L110" class="LineNr">110 </span><span class="Delimiter">:(scenario xor_r32_with_r32)</span>
<span id="L111" class="LineNr">111 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L112" class="LineNr">112 </span><span class="Special">% Reg[3].i = 0xaabbc0d0;</span>
<span id="L113" class="LineNr">113 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L114" class="LineNr">114 </span> <span class="Constant">31</span> d8 <span class="Comment"># xor EBX (reg 3) with destination EAX (reg 0)</span>
<span id="L115" class="LineNr">115 </span><span class="traceContains">+run: xor <a href='010core.cc.html#L17'>reg</a> 3 with effective address</span>
<span id="L116" class="LineNr">116 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L117" class="LineNr">117 </span><span class="traceContains">+run: storing 0xa0b0ccdd</span>
<span id="L118" class="LineNr">118 </span>
<span id="L119" class="LineNr">119 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L120" class="LineNr">120 </span><span class="Normal">case</span> <span class="Constant">0x31</span>: <span class="Delimiter">{</span> <span class="Comment">// xor r32 with r/m32</span>
<span id="L121" class="LineNr">121 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L122" class="LineNr">122 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L123" class="LineNr">123 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"xor <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L124" class="LineNr">124 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L125" class="LineNr">125 </span> <a href='010core.cc.html#L55'>BINARY_BITWISE_OP</a><span class="Delimiter">(</span>^<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L126" class="LineNr">126 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L127" class="LineNr">127 </span><span class="Delimiter">}</span>
<span id="L128" class="LineNr">128 </span>
<span id="L129" class="LineNr">129 </span><span class="SalientComment">//:: not</span>
<span id="L130" class="LineNr">130 </span>
<span id="L131" class="LineNr">131 </span><span class="Delimiter">:(scenario not_r32)</span>
<span id="L132" class="LineNr">132 </span><span class="Special">% Reg[3].i = 0x0f0f00ff;</span>
<span id="L133" class="LineNr">133 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L134" class="LineNr">134 </span> f7 c3 <span class="Comment"># not EBX (reg 3)</span>
<span id="L135" class="LineNr">135 </span><span class="traceContains">+run: 'not' of effective address</span>
<span id="L136" class="LineNr">136 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 3</span>
<span id="L137" class="LineNr">137 </span><span class="traceContains">+run: storing 0xf0f0ff00</span>
<span id="L138" class="LineNr">138 </span>
<span id="L139" class="LineNr">139 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L140" class="LineNr">140 </span><span class="Normal">case</span> <span class="Constant">0xf7</span>: <span class="Delimiter">{</span> <span class="Comment">// xor r32 with r/m32</span>
<span id="L141" class="LineNr">141 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L142" class="LineNr">142 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"'not' of effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L143" class="LineNr">143 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L144" class="LineNr">144 </span> *arg1 = ~<span class="Delimiter">(</span>*arg1<span class="Delimiter">);</span>
<span id="L145" class="LineNr">145 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"storing 0x"</span> << <a href='010core.cc.html#L230'>HEXWORD</a> << *arg1 << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L146" class="LineNr">146 </span> SF = <span class="Delimiter">(</span>*arg1 >> <span class="Constant">31</span><span class="Delimiter">);</span>
<span id="L147" class="LineNr">147 </span> ZF = <span class="Delimiter">(</span>*arg1 == <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L148" class="LineNr">148 </span> <a href='010core.cc.html#L33'>OF</a> = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L149" class="LineNr">149 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L150" class="LineNr">150 </span><span class="Delimiter">}</span>
<span id="L151" class="LineNr">151 </span>
<span id="L152" class="LineNr">152 </span><span class="SalientComment">//:: compare (cmp)</span>
<span id="L153" class="LineNr">153 </span>
<span id="L154" class="LineNr">154 </span><span class="Delimiter">:(scenario compare_r32_with_r32_greater)</span>
<span id="L155" class="LineNr">155 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L156" class="LineNr">156 </span><span class="Special">% Reg[3].i = 0x0a0b0c07;</span>
<span id="L157" class="LineNr">157 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L158" class="LineNr">158 </span> <span class="Constant">39</span> d8 <span class="Comment"># compare EBX (reg 3) with EAX (reg 0)</span>
<span id="L159" class="LineNr">159 </span><span class="traceContains">+run: compare <a href='010core.cc.html#L17'>reg</a> 3 with effective address</span>
<span id="L160" class="LineNr">160 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L161" class="LineNr">161 </span><span class="traceContains">+run: SF=0; ZF=0; OF=0</span>
<span id="L162" class="LineNr">162 </span>
<span id="L163" class="LineNr">163 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L164" class="LineNr">164 </span><span class="Normal">case</span> <span class="Constant">0x39</span>: <span class="Delimiter">{</span> <span class="Comment">// set SF if r/m32 < r32</span>
<span id="L165" class="LineNr">165 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L166" class="LineNr">166 </span> <span class="Normal">uint8_t</span> reg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L167" class="LineNr">167 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"compare <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>reg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L168" class="LineNr">168 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L169" class="LineNr">169 </span> <span class="Normal">int32_t</span> arg2 = Reg[reg2]<span class="Delimiter">.</span>i<span class="Delimiter">;</span>
<span id="L170" class="LineNr">170 </span> <span class="Normal">int32_t</span> tmp1 = *arg1 - arg2<span class="Delimiter">;</span>
<span id="L171" class="LineNr">171 </span> SF = <span class="Delimiter">(</span>tmp1 < <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L172" class="LineNr">172 </span> ZF = <span class="Delimiter">(</span>tmp1 == <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L173" class="LineNr">173 </span> <span class="Normal">int64_t</span> tmp2 = *arg1 - arg2<span class="Delimiter">;</span>
<span id="L174" class="LineNr">174 </span> <a href='010core.cc.html#L33'>OF</a> = <span class="Delimiter">(</span>tmp1 != tmp2<span class="Delimiter">);</span>
<span id="L175" class="LineNr">175 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"SF="</span> << SF << <span class="Constant">"; ZF="</span> << ZF << <span class="Constant">"; OF="</span> << <a href='010core.cc.html#L33'>OF</a> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L176" class="LineNr">176 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L177" class="LineNr">177 </span><span class="Delimiter">}</span>
<span id="L178" class="LineNr">178 </span>
<span id="L179" class="LineNr">179 </span><span class="Delimiter">:(scenario compare_r32_with_r32_lesser)</span>
<span id="L180" class="LineNr">180 </span><span class="Special">% Reg[0].i = 0x0a0b0c07;</span>
<span id="L181" class="LineNr">181 </span><span class="Special">% Reg[3].i = 0x0a0b0c0d;</span>
<span id="L182" class="LineNr">182 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L183" class="LineNr">183 </span> <span class="Constant">39</span> d8 <span class="Comment"># compare EBX (reg 3) with EAX (reg 0)</span>
<span id="L184" class="LineNr">184 </span><span class="traceContains">+run: compare <a href='010core.cc.html#L17'>reg</a> 3 with effective address</span>
<span id="L185" class="LineNr">185 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L186" class="LineNr">186 </span><span class="traceContains">+run: SF=1; ZF=0; OF=0</span>
<span id="L187" class="LineNr">187 </span>
<span id="L188" class="LineNr">188 </span><span class="Delimiter">:(scenario compare_r32_with_r32_equal)</span>
<span id="L189" class="LineNr">189 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L190" class="LineNr">190 </span><span class="Special">% Reg[3].i = 0x0a0b0c0d;</span>
<span id="L191" class="LineNr">191 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L192" class="LineNr">192 </span> <span class="Constant">39</span> d8 <span class="Comment"># compare EBX (reg 3) with EAX (reg 0)</span>
<span id="L193" class="LineNr">193 </span><span class="traceContains">+run: compare <a href='010core.cc.html#L17'>reg</a> 3 with effective address</span>
<span id="L194" class="LineNr">194 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L195" class="LineNr">195 </span><span class="traceContains">+run: SF=0; ZF=1; OF=0</span>
<span id="L196" class="LineNr">196 </span>
<span id="L197" class="LineNr">197 </span><span class="SalientComment">//:: copy (mov)</span>
<span id="L198" class="LineNr">198 </span>
<span id="L199" class="LineNr">199 </span><span class="Delimiter">:(scenario copy_r32_to_r32)</span>
<span id="L200" class="LineNr">200 </span><span class="Special">% Reg[3].i = 0xaf;</span>
<span id="L201" class="LineNr">201 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L202" class="LineNr">202 </span> <span class="Constant">89</span> d8 <span class="Comment"># copy EBX (reg 3) to EAX (reg 0)</span>
<span id="L203" class="LineNr">203 </span><span class="traceContains">+run: copy <a href='010core.cc.html#L17'>reg</a> 3 to effective address</span>
<span id="L204" class="LineNr">204 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L17'>reg</a> 0</span>
<span id="L205" class="LineNr">205 </span><span class="traceContains">+run: storing 0x000000af</span>
<span id="L206" class="LineNr">206 </span>
<span id="L207" class="LineNr">207 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L208" class="LineNr">208 </span><span class="Normal">case</span> <span class="Constant">0x89</span>: <span class="Delimiter">{</span> <span class="Comment">// copy r32 to r/m32</span>
<span id="L209" class="LineNr">209 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L210" class="LineNr">210 </span> <span class="Normal">uint8_t</span> reg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L211" class="LineNr">211 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"copy <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span>reg2<span class="Delimiter">)</span> << <span class="Constant">" to effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L212" class="LineNr">212 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L213" class="LineNr">213 </span> *arg1 = Reg[reg2]<span class="Delimiter">.</span>i<span class="Delimiter">;</span>
<span id="L214" class="LineNr">214 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"storing 0x"</span> << <a href='010core.cc.html#L230'>HEXWORD</a> << *arg1 << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L215" class="LineNr">215 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L216" class="LineNr">216 </span><span class="Delimiter">}</span>
<span id="L217" class="LineNr">217 </span>
<span id="L218" class="LineNr">218 </span><span class="SalientComment">//:: push</span>
<span id="L219" class="LineNr">219 </span>
<span id="L220" class="LineNr">220 </span><span class="Delimiter">:(scenario push_r32)</span>
<span id="L221" class="LineNr">221 </span><span class="Special">% Reg[ESP].u = 0x64;</span>
<span id="L222" class="LineNr">222 </span><span class="Special">% Reg[EBX].i = 0x0000000a;</span>
<span id="L223" class="LineNr">223 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L224" class="LineNr">224 </span> <span class="Constant">53</span> <span class="Comment"># push EBX (reg 3) to stack</span>
<span id="L225" class="LineNr">225 </span><span class="traceContains">+run: <a href='011direct_addressing.cc.html#L244'>push</a> <a href='010core.cc.html#L17'>reg</a> 3</span>
<span id="L226" class="LineNr">226 </span><span class="traceContains">+run: decrementing <a href='010core.cc.html#L11'>ESP</a> to 0x00000060</span>
<span id="L227" class="LineNr">227 </span><span class="traceContains">+run: pushing value 0x0000000a</span>
<span id="L228" class="LineNr">228 </span>
<span id="L229" class="LineNr">229 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L230" class="LineNr">230 </span><span class="Normal">case</span> <span class="Constant">0x50</span>:
<span id="L231" class="LineNr">231 </span><span class="Normal">case</span> <span class="Constant">0x51</span>:
<span id="L232" class="LineNr">232 </span><span class="Normal">case</span> <span class="Constant">0x52</span>:
<span id="L233" class="LineNr">233 </span><span class="Normal">case</span> <span class="Constant">0x53</span>:
<span id="L234" class="LineNr">234 </span><span class="Normal">case</span> <span class="Constant">0x54</span>:
<span id="L235" class="LineNr">235 </span><span class="Normal">case</span> <span class="Constant">0x55</span>:
<span id="L236" class="LineNr">236 </span><span class="Normal">case</span> <span class="Constant">0x56</span>:
<span id="L237" class="LineNr">237 </span><span class="Normal">case</span> <span class="Constant">0x57</span>: <span class="Delimiter">{</span> <span class="Comment">// push r32 to stack</span>
<span id="L238" class="LineNr">238 </span> <span class="Normal">uint8_t</span> <a href='010core.cc.html#L17'>reg</a> = op & <span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L239" class="LineNr">239 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"push <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span><a href='010core.cc.html#L17'>reg</a><span class="Delimiter">)</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L240" class="LineNr">240 </span> <a href='011direct_addressing.cc.html#L244'>push</a><span class="Delimiter">(</span>Reg[reg]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L241" class="LineNr">241 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L242" class="LineNr">242 </span><span class="Delimiter">}</span>
<span id="L243" class="LineNr">243 </span><span class="Delimiter">:(code)</span>
<span id="L244" class="LineNr">244 </span><span class="Normal">void</span> <a href='011direct_addressing.cc.html#L244'>push</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L245" class="LineNr">245 </span> Reg[ESP]<span class="Delimiter">.</span>u -= <span class="Constant">4</span><span class="Delimiter">;</span>
<span id="L246" class="LineNr">246 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"decrementing <a href='010core.cc.html#L11'>ESP</a> to 0x"</span> << <a href='010core.cc.html#L230'>HEXWORD</a> << Reg[ESP]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L247" class="LineNr">247 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"pushing value 0x"</span> << <a href='010core.cc.html#L230'>HEXWORD</a> << val << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L248" class="LineNr">248 </span> *<span class="Normal">reinterpret_cast</span><<span class="Normal">uint32_t</span>*><span class="Delimiter">(</span>&Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>Reg[ESP]<span class="Delimiter">.</span>u<span class="Delimiter">))</span> = val<span class="Delimiter">;</span>
<span id="L249" class="LineNr">249 </span><span class="Delimiter">}</span>
<span id="L250" class="LineNr">250 </span>
<span id="L251" class="LineNr">251 </span><span class="SalientComment">//:: pop</span>
<span id="L252" class="LineNr">252 </span>
<span id="L253" class="LineNr">253 </span><span class="Delimiter">:(scenario pop_r32)</span>
<span id="L254" class="LineNr">254 </span><span class="Special">% Reg[ESP].u = 0x60;</span>
<span id="L255" class="LineNr">255 </span><span class="Special">% SET_WORD_IN_MEM(0x60, 0x0000000a);</span>
<span id="L256" class="LineNr">256 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L257" class="LineNr">257 </span> 5b <span class="Comment"># pop stack to EBX (reg 3)</span>
<span id="L258" class="LineNr">258 </span><span class="traceContains">+run: <a href='011direct_addressing.cc.html#L277'>pop</a> into <a href='010core.cc.html#L17'>reg</a> 3</span>
<span id="L259" class="LineNr">259 </span><span class="traceContains">+run: popping value 0x0000000a</span>
<span id="L260" class="LineNr">260 </span><span class="traceContains">+run: incrementing <a href='010core.cc.html#L11'>ESP</a> to 0x00000064</span>
<span id="L261" class="LineNr">261 </span>
<span id="L262" class="LineNr">262 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L263" class="LineNr">263 </span><span class="Normal">case</span> <span class="Constant">0x58</span>:
<span id="L264" class="LineNr">264 </span><span class="Normal">case</span> <span class="Constant">0x59</span>:
<span id="L265" class="LineNr">265 </span><span class="Normal">case</span> <span class="Constant">0x5a</span>:
<span id="L266" class="LineNr">266 </span><span class="Normal">case</span> <span class="Constant">0x5b</span>:
<span id="L267" class="LineNr">267 </span><span class="Normal">case</span> <span class="Constant">0x5c</span>:
<span id="L268" class="LineNr">268 </span><span class="Normal">case</span> <span class="Constant">0x5d</span>:
<span id="L269" class="LineNr">269 </span><span class="Normal">case</span> <span class="Constant">0x5e</span>:
<span id="L270" class="LineNr">270 </span><span class="Normal">case</span> <span class="Constant">0x5f</span>: <span class="Delimiter">{</span> <span class="Comment">// pop stack into r32</span>
<span id="L271" class="LineNr">271 </span> <span class="Normal">uint8_t</span> <a href='010core.cc.html#L17'>reg</a> = op & <span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L272" class="LineNr">272 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"pop into <a href='010core.cc.html#L17'>reg</a> "</span> << <a href='010core.cc.html#L232'>NUM</a><span class="Delimiter">(</span><a href='010core.cc.html#L17'>reg</a><span class="Delimiter">)</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L273" class="LineNr">273 </span> Reg[reg]<span class="Delimiter">.</span>u = <a href='011direct_addressing.cc.html#L277'>pop</a><span class="Delimiter">();</span>
<span id="L274" class="LineNr">274 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L275" class="LineNr">275 </span><span class="Delimiter">}</span>
<span id="L276" class="LineNr">276 </span><span class="Delimiter">:(code)</span>
<span id="L277" class="LineNr">277 </span><span class="Normal">uint32_t</span> <a href='011direct_addressing.cc.html#L277'>pop</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L278" class="LineNr">278 </span> <span class="Normal">uint32_t</span> result = *<span class="Normal">reinterpret_cast</span><<span class="Normal">uint32_t</span>*><span class="Delimiter">(</span>&Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>Reg[ESP]<span class="Delimiter">.</span>u<span class="Delimiter">));</span>
<span id="L279" class="LineNr">279 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"popping value 0x"</span> << <a href='010core.cc.html#L230'>HEXWORD</a> << result << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L280" class="LineNr">280 </span> Reg[ESP]<span class="Delimiter">.</span>u += <span class="Constant">4</span><span class="Delimiter">;</span>
<span id="L281" class="LineNr">281 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"incrementing <a href='010core.cc.html#L11'>ESP</a> to 0x"</span> << <a href='010core.cc.html#L230'>HEXWORD</a> << Reg[ESP]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L282" class="LineNr">282 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L283" class="LineNr">283 </span><span class="Delimiter">}</span>
</pre>
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