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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Core data structures for simulating the SubX VM (subset of an x86 processor)</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//:</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: At the lowest level ("level 1") of abstraction, SubX executes x86</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: instructions provided in the form of an array of bytes, loaded into memory</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: starting at a specific address.</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="SalientComment">//:: registers</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//: assume segment registers are hard-coded to 0</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">//: no floating-point, MMX, etc. yet</span>
<span id="L10" class="LineNr"> 10 </span>
<span id="L11" class="LineNr"> 11 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L12" class="LineNr"> 12 </span><span class="Normal">enum</span> <span class="Delimiter">{</span>
<span id="L13" class="LineNr"> 13 </span> <a href='010vm.cc.html#L13'>EAX</a><span class="Delimiter">,</span>
<span id="L14" class="LineNr"> 14 </span> <a href='010vm.cc.html#L14'>ECX</a><span class="Delimiter">,</span>
<span id="L15" class="LineNr"> 15 </span> <a href='010vm.cc.html#L15'>EDX</a><span class="Delimiter">,</span>
<span id="L16" class="LineNr"> 16 </span> <a href='010vm.cc.html#L16'>EBX</a><span class="Delimiter">,</span>
<span id="L17" class="LineNr"> 17 </span> <a href='010vm.cc.html#L17'>ESP</a><span class="Delimiter">,</span>
<span id="L18" class="LineNr"> 18 </span> <a href='010vm.cc.html#L18'>EBP</a><span class="Delimiter">,</span>
<span id="L19" class="LineNr"> 19 </span> <a href='010vm.cc.html#L19'>ESI</a><span class="Delimiter">,</span>
<span id="L20" class="LineNr"> 20 </span> <a href='010vm.cc.html#L20'>EDI</a><span class="Delimiter">,</span>
<span id="L21" class="LineNr"> 21 </span> <a href='010vm.cc.html#L21'>NUM_INT_REGISTERS</a><span class="Delimiter">,</span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">};</span>
<span id="L23" class="LineNr"> 23 </span><span class="Normal">union</span> <a href='010vm.cc.html#L23'>reg</a> <span class="Delimiter">{</span>
<span id="L24" class="LineNr"> 24 </span> <span class="Normal">int32_t</span> i<span class="Delimiter">;</span>
<span id="L25" class="LineNr"> 25 </span> <span class="Normal">uint32_t</span> u<span class="Delimiter">;</span>
<span id="L26" class="LineNr"> 26 </span><span class="Delimiter">};</span>
<span id="L27" class="LineNr"> 27 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L28" class="LineNr"> 28 </span><a href='010vm.cc.html#L23'>reg</a> Reg[NUM_INT_REGISTERS] = <span class="Delimiter">{</span> <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">}</span> <span class="Delimiter">};</span>
<span id="L29" class="LineNr"> 29 </span><span class="Normal">uint32_t</span> <a href='010vm.cc.html#L29'>EIP</a> = <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// preserve null pointer</span>
<span id="L30" class="LineNr"> 30 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L31" class="LineNr"> 31 </span>bzero<span class="Delimiter">(</span><a href='010vm.cc.html#L28'>Reg</a><span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span><a href='010vm.cc.html#L28'>Reg</a><span class="Delimiter">));</span>
<span id="L32" class="LineNr"> 32 </span><a href='010vm.cc.html#L29'>EIP</a> = <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// preserve null pointer</span>
<span id="L33" class="LineNr"> 33 </span>
<span id="L34" class="LineNr"> 34 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Contents")</span>
<span id="L35" class="LineNr"> 35 </span>cerr << <span class="Constant">" registers</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L36" class="LineNr"> 36 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Texts")</span>
<span id="L37" class="LineNr"> 37 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='001help.cc.html#L53'>Help</a><span class="Delimiter">,</span> <span class="Constant">"registers"</span><span class="Delimiter">,</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Constant">"SubX currently supports eight 32-bit integer registers: R0 to R7.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Constant">"R4 (ESP) contains the top of the stack.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Constant">"There's also a register for the address of the currently executing</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Constant">"instruction. It is modified by jumps.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Constant">"Various instructions modify one or more of three 1-bit 'flag' registers,</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Constant">"as a side-effect:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Constant">"- the sign flag (SF): usually set if an arithmetic result is negative, or</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Constant">" <a href='000organization.cc.html#L148'>reset</a> if not.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Constant">"- the zero flag (ZF): usually set if a result is zero, or <a href='000organization.cc.html#L148'>reset</a> if not.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Constant">"- the overflow flag (OF): usually set if an arithmetic result overflows.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Constant">"The flag bits are read by conditional jumps.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Constant">"We don't support non-integer (floating-point) registers yet.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L53" class="LineNr"> 53 </span><span class="Delimiter">);</span>
<span id="L54" class="LineNr"> 54 </span>
<span id="L55" class="LineNr"> 55 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L56" class="LineNr"> 56 </span><span class="Comment">// the subset of x86 flag registers we care about</span>
<span id="L57" class="LineNr"> 57 </span><span class="Normal">bool</span> SF =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// sign flag</span>
<span id="L58" class="LineNr"> 58 </span><span class="Normal">bool</span> ZF =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// zero flag</span>
<span id="L59" class="LineNr"> 59 </span><span class="Normal">bool</span> <a href='010vm.cc.html#L59'>OF</a> =<span class="Constant"> false</span><span class="Delimiter">;</span> <span class="Comment">// overflow flag</span>
<span id="L60" class="LineNr"> 60 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L61" class="LineNr"> 61 </span>SF = ZF = <a href='010vm.cc.html#L59'>OF</a> =<span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L62" class="LineNr"> 62 </span>
<span id="L63" class="LineNr"> 63 </span><span class="Comment">//: how the flag registers are updated after each instruction</span>
<span id="L64" class="LineNr"> 64 </span>
<span id="L65" class="LineNr"> 65 </span><span class="Delimiter">:(before "End Includes")</span>
<span id="L66" class="LineNr"> 66 </span><span class="Comment">// Combine 'arg1' and 'arg2' with arithmetic operation 'op' and store the</span>
<span id="L67" class="LineNr"> 67 </span><span class="Comment">// result in 'arg1', then update flags.</span>
<span id="L68" class="LineNr"> 68 </span><span class="Comment">// beware: no side-effects in args</span>
<span id="L69" class="LineNr"> 69 </span><span class="Comment">#define BINARY_ARITHMETIC_OP(op, arg1, arg2) { \</span>
<span id="L70" class="LineNr"> 70 </span> <span class="Comment">/*</span><span class="Comment"> arg1 and arg2 must be signed </span><span class="Comment">*/</span> \
<span id="L71" class="LineNr"> 71 </span> <span class="Normal">int64_t</span> tmp = arg1 op arg2<span class="Delimiter">;</span> \
<span id="L72" class="LineNr"> 72 </span> arg1 = arg1 op arg2<span class="Delimiter">;</span> \
<span id="L73" class="LineNr"> 73 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"storing 0x"</span> << <a href='010vm.cc.html#L228'>HEXWORD</a> << arg1 << <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span> \
<span id="L74" class="LineNr"> 74 </span> SF = <span class="Delimiter">(</span>arg1 < <span class="Constant">0</span><span class="Delimiter">);</span> \
<span id="L75" class="LineNr"> 75 </span> ZF = <span class="Delimiter">(</span>arg1 == <span class="Constant">0</span><span class="Delimiter">);</span> \
<span id="L76" class="LineNr"> 76 </span> <a href='010vm.cc.html#L59'>OF</a> = <span class="Delimiter">(</span>arg1 != tmp<span class="Delimiter">);</span> \
<span id="L77" class="LineNr"> 77 </span><span class="Delimiter">}</span>
<span id="L78" class="LineNr"> 78 </span>
<span id="L79" class="LineNr"> 79 </span><span class="Comment">// Combine 'arg1' and 'arg2' with bitwise operation 'op' and store the result</span>
<span id="L80" class="LineNr"> 80 </span><span class="Comment">// in 'arg1', then update flags.</span>
<span id="L81" class="LineNr"> 81 </span><span class="Comment">#define BINARY_BITWISE_OP(op, arg1, arg2) { \</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Comment">/*</span><span class="Comment"> arg1 and arg2 must be unsigned </span><span class="Comment">*/</span> \
<span id="L83" class="LineNr"> 83 </span> arg1 = arg1 op arg2<span class="Delimiter">;</span> \
<span id="L84" class="LineNr"> 84 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"storing 0x"</span> << <a href='010vm.cc.html#L228'>HEXWORD</a> << arg1 << <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span> \
<span id="L85" class="LineNr"> 85 </span> SF = <span class="Delimiter">(</span>arg1 >> <span class="Constant">31</span><span class="Delimiter">);</span> \
<span id="L86" class="LineNr"> 86 </span> ZF = <span class="Delimiter">(</span>arg1 == <span class="Constant">0</span><span class="Delimiter">);</span> \
<span id="L87" class="LineNr"> 87 </span> <a href='010vm.cc.html#L59'>OF</a> =<span class="Constant"> false</span><span class="Delimiter">;</span> \
<span id="L88" class="LineNr"> 88 </span><span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </span>
<span id="L90" class="LineNr"> 90 </span><span class="SalientComment">//:: simulated RAM</span>
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L93" class="LineNr"> 93 </span>vector<<span class="Normal">uint8_t</span>> <a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">;</span>
<span id="L94" class="LineNr"> 94 </span><span class="Normal">uint32_t</span> <a href='010vm.cc.html#L94'>Mem_offset</a> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L95" class="LineNr"> 95 </span><span class="Normal">uint32_t</span> <a href='010vm.cc.html#L95'>End_of_program</a> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L96" class="LineNr"> 96 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L97" class="LineNr"> 97 </span><a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span id="L98" class="LineNr"> 98 </span><a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1024</span><span class="Delimiter">);</span>
<span id="L99" class="LineNr"> 99 </span><a href='010vm.cc.html#L94'>Mem_offset</a> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L100" class="LineNr">100 </span><a href='010vm.cc.html#L95'>End_of_program</a> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L101" class="LineNr">101 </span><span class="Delimiter">:(code)</span>
<span id="L102" class="LineNr">102 </span><span class="Comment">// These helpers depend on Mem being laid out contiguously (so you can't use a</span>
<span id="L103" class="LineNr">103 </span><span class="Comment">// map, etc.) and on the host also being little-endian.</span>
<span id="L104" class="LineNr">104 </span><span class="Normal">inline</span> <span class="Normal">uint8_t</span> <a href='010vm.cc.html#L104'>read_mem_u8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L105" class="LineNr">105 </span> <span class="Identifier">return</span> <a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">);</span>
<span id="L106" class="LineNr">106 </span><span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span><span class="Normal">inline</span> <span class="Normal">int8_t</span> <a href='010vm.cc.html#L107'>read_mem_i8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L108" class="LineNr">108 </span> <span class="Identifier">return</span> <span class="Normal">static_cast</span><<span class="Normal">int8_t</span>><span class="Delimiter">(</span><a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">));</span>
<span id="L109" class="LineNr">109 </span><span class="Delimiter">}</span>
<span id="L110" class="LineNr">110 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span> <a href='010vm.cc.html#L110'>read_mem_u32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L111" class="LineNr">111 </span> <span class="Identifier">return</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>addr-Mem_offset<span class="Delimiter">));</span>
<span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span><span class="Normal">inline</span> <span class="Normal">int32_t</span> <a href='010vm.cc.html#L113'>read_mem_i32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L114" class="LineNr">114 </span> <span class="Identifier">return</span> *<span class="Normal">reinterpret_cast</span><<span class="Normal">int32_t</span>*><span class="Delimiter">(</span>&Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">));</span>
<span id="L115" class="LineNr">115 </span><span class="Delimiter">}</span>
<span id="L116" class="LineNr">116 </span>
<span id="L117" class="LineNr">117 </span><span class="Normal">inline</span> <span class="Normal">uint8_t</span>* <a href='010vm.cc.html#L117'>mem_addr_u8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </span> <span class="Identifier">return</span> &Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">);</span>
<span id="L119" class="LineNr">119 </span><span class="Delimiter">}</span>
<span id="L120" class="LineNr">120 </span><span class="Normal">inline</span> <span class="Normal">int8_t</span>* <a href='010vm.cc.html#L120'>mem_addr_i8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L121" class="LineNr">121 </span> <span class="Identifier">return</span> <span class="Normal">reinterpret_cast</span><<span class="Normal">int8_t</span>*><span class="Delimiter">(</span>&Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">));</span>
<span id="L122" class="LineNr">122 </span><span class="Delimiter">}</span>
<span id="L123" class="LineNr">123 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span>* <a href='010vm.cc.html#L123'>mem_addr_u32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L124" class="LineNr">124 </span> <span class="Identifier">return</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>addr-Mem_offset<span class="Delimiter">));</span>
<span id="L125" class="LineNr">125 </span><span class="Delimiter">}</span>
<span id="L126" class="LineNr">126 </span><span class="Normal">inline</span> <span class="Normal">int32_t</span>* <a href='010vm.cc.html#L126'>mem_addr_i32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L127" class="LineNr">127 </span> <span class="Identifier">return</span> <span class="Normal">reinterpret_cast</span><<span class="Normal">int32_t</span>*><span class="Delimiter">(</span>&Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">));</span>
<span id="L128" class="LineNr">128 </span><span class="Delimiter">}</span>
<span id="L129" class="LineNr">129 </span>
<span id="L130" class="LineNr">130 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010vm.cc.html#L130'>write_mem_u8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">uint8_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L131" class="LineNr">131 </span> <a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">)</span> = val<span class="Delimiter">;</span>
<span id="L132" class="LineNr">132 </span><span class="Delimiter">}</span>
<span id="L133" class="LineNr">133 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010vm.cc.html#L133'>write_mem_i8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">int8_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L134" class="LineNr">134 </span> <a href='010vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">)</span> = <span class="Normal">static_cast</span><<span class="Normal">uint8_t</span>><span class="Delimiter">(</span>val<span class="Delimiter">);</span>
<span id="L135" class="LineNr">135 </span><span class="Delimiter">}</span>
<span id="L136" class="LineNr">136 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010vm.cc.html#L136'>write_mem_u32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L137" class="LineNr">137 </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>addr-Mem_offset<span class="Delimiter">))</span> = val<span class="Delimiter">;</span>
<span id="L138" class="LineNr">138 </span><span class="Delimiter">}</span>
<span id="L139" class="LineNr">139 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010vm.cc.html#L139'>write_mem_i32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">int32_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L140" class="LineNr">140 </span> *<span class="Normal">reinterpret_cast</span><<span class="Normal">int32_t</span>*><span class="Delimiter">(</span>&Mem<span class="Delimiter">.</span>at<span class="Delimiter">(</span>addr-Mem_offset<span class="Delimiter">))</span> = val<span class="Delimiter">;</span>
<span id="L141" class="LineNr">141 </span><span class="Delimiter">}</span>
<span id="L142" class="LineNr">142 </span>
<span id="L143" class="LineNr">143 </span><span class="SalientComment">//:: core interpreter loop</span>
<span id="L144" class="LineNr">144 </span>
<span id="L145" class="LineNr">145 </span><span class="Delimiter">:(code)</span>
<span id="L146" class="LineNr">146 </span><span class="Comment">// skeleton of how x86 instructions are decoded</span>
<span id="L147" class="LineNr">147 </span><span class="Normal">void</span> <a href='010vm.cc.html#L147'>run_one_instruction</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L148" class="LineNr">148 </span> <span class="Normal">uint8_t</span> op=<span class="Constant">0</span><span class="Delimiter">,</span> op2=<span class="Constant">0</span><span class="Delimiter">,</span> op3=<span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L149" class="LineNr">149 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"inst: 0x"</span> << <a href='010vm.cc.html#L228'>HEXWORD</a> << <a href='010vm.cc.html#L29'>EIP</a> << <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span>
<span id="L150" class="LineNr">150 </span><span class="CommentedCode">//? cerr << "inst: 0x" << EIP << '\n';</span>
<span id="L151" class="LineNr">151 </span> <span class="Normal">switch</span> <span class="Delimiter">(</span>op = <a href='010vm.cc.html#L190'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L152" class="LineNr">152 </span> <span class="Normal">case</span> <span class="Constant">0xf4</span>: <span class="Comment">// hlt</span>
<span id="L153" class="LineNr">153 </span> <a href='010vm.cc.html#L29'>EIP</a> = <a href='010vm.cc.html#L95'>End_of_program</a><span class="Delimiter">;</span>
<span id="L154" class="LineNr">154 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L155" class="LineNr">155 </span> <span class="Comment">// End Single-Byte Opcodes</span>
<span id="L156" class="LineNr">156 </span> <span class="Normal">case</span> <span class="Constant">0x0f</span>:
<span id="L157" class="LineNr">157 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op2 = <a href='010vm.cc.html#L190'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L158" class="LineNr">158 </span> <span class="Comment">// End Two-Byte Opcodes Starting With 0f</span>
<span id="L159" class="LineNr">159 </span> <span class="Normal">default</span>:
<span id="L160" class="LineNr">160 </span> cerr << <span class="Constant">"unrecognized second opcode after 0f: "</span> << <a href='010vm.cc.html#L227'>HEXBYTE</a> << <a href='010vm.cc.html#L230'>NUM</a><span class="Delimiter">(</span>op2<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L161" class="LineNr">161 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span><span class="Constant">""</span><span class="Delimiter">);</span>
<span id="L162" class="LineNr">162 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L163" class="LineNr">163 </span> <span class="Delimiter">}</span>
<span id="L164" class="LineNr">164 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L165" class="LineNr">165 </span> <span class="Normal">case</span> <span class="Constant">0xf3</span>:
<span id="L166" class="LineNr">166 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op2 = <a href='010vm.cc.html#L190'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L167" class="LineNr">167 </span> <span class="Comment">// End Two-Byte Opcodes Starting With f3</span>
<span id="L168" class="LineNr">168 </span> <span class="Normal">case</span> <span class="Constant">0x0f</span>:
<span id="L169" class="LineNr">169 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op3 = <a href='010vm.cc.html#L190'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L170" class="LineNr">170 </span> <span class="Comment">// End Three-Byte Opcodes Starting With f3 0f</span>
<span id="L171" class="LineNr">171 </span> <span class="Normal">default</span>:
<span id="L172" class="LineNr">172 </span> cerr << <span class="Constant">"unrecognized third opcode after f3 0f: "</span> << <a href='010vm.cc.html#L227'>HEXBYTE</a> << <a href='010vm.cc.html#L230'>NUM</a><span class="Delimiter">(</span>op3<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L173" class="LineNr">173 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span><span class="Constant">""</span><span class="Delimiter">);</span>
<span id="L174" class="LineNr">174 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L175" class="LineNr">175 </span> <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="Normal">default</span>:
<span id="L178" class="LineNr">178 </span> cerr << <span class="Constant">"unrecognized second opcode after f3: "</span> << <a href='010vm.cc.html#L227'>HEXBYTE</a> << <a href='010vm.cc.html#L230'>NUM</a><span class="Delimiter">(</span>op2<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L179" class="LineNr">179 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span><span class="Constant">""</span><span class="Delimiter">);</span>
<span id="L180" class="LineNr">180 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L181" class="LineNr">181 </span> <span class="Delimiter">}</span>
<span id="L182" class="LineNr">182 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L183" class="LineNr">183 </span> <span class="Normal">default</span>:
<span id="L184" class="LineNr">184 </span> cerr << <span class="Constant">"unrecognized opcode: "</span> << <a href='010vm.cc.html#L227'>HEXBYTE</a> << <a href='010vm.cc.html#L230'>NUM</a><span class="Delimiter">(</span>op<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L185" class="LineNr">185 </span> <a href='003trace.cc.html#L193'>DUMP</a><span class="Delimiter">(</span><span class="Constant">""</span><span class="Delimiter">);</span>
<span id="L186" class="LineNr">186 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L187" class="LineNr">187 </span> <span class="Delimiter">}</span>
<span id="L188" class="LineNr">188 </span><span class="Delimiter">}</span>
<span id="L189" class="LineNr">189 </span>
<span id="L190" class="LineNr">190 </span><span class="Normal">inline</span> <span class="Normal">uint8_t</span> <a href='010vm.cc.html#L190'>next</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L191" class="LineNr">191 </span> <span class="Identifier">return</span> <a href='010vm.cc.html#L104'>read_mem_u8</a><span class="Delimiter">(</span>EIP++<span class="Delimiter">);</span>
<span id="L192" class="LineNr">192 </span><span class="Delimiter">}</span>
<span id="L193" class="LineNr">193 </span>
<span id="L194" class="LineNr">194 </span><span class="Comment">//: start tracking supported opcodes</span>
<span id="L195" class="LineNr">195 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L196" class="LineNr">196 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <a href='010vm.cc.html#L196'>name</a><span class="Delimiter">;</span>
<span id="L197" class="LineNr">197 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <a href='010vm.cc.html#L197'>name_0f</a><span class="Delimiter">;</span>
<span id="L198" class="LineNr">198 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <a href='010vm.cc.html#L198'>name_f3</a><span class="Delimiter">;</span>
<span id="L199" class="LineNr">199 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <a href='010vm.cc.html#L199'>name_f3_0f</a><span class="Delimiter">;</span>
<span id="L200" class="LineNr">200 </span><span class="Delimiter">:(before "End One-time Setup")</span>
<span id="L201" class="LineNr">201 </span><a href='010vm.cc.html#L203'>init_op_names</a><span class="Delimiter">();</span>
<span id="L202" class="LineNr">202 </span><span class="Delimiter">:(code)</span>
<span id="L203" class="LineNr">203 </span><span class="Normal">void</span> <a href='010vm.cc.html#L203'>init_op_names</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L204" class="LineNr">204 </span> <a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='010vm.cc.html#L196'>name</a><span class="Delimiter">,</span> <span class="Constant">"f4"</span><span class="Delimiter">,</span> <span class="Constant">"halt"</span><span class="Delimiter">);</span>
<span id="L205" class="LineNr">205 </span> <span class="Comment">// End Initialize Op Names(name)</span>
<span id="L206" class="LineNr">206 </span><span class="Delimiter">}</span>
<span id="L207" class="LineNr">207 </span>
<span id="L208" class="LineNr">208 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Special-cases(key)")</span>
<span id="L209" class="LineNr">209 </span><span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">"opcodes"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L210" class="LineNr">210 </span> cerr << <span class="Constant">"Opcodes currently supported by SubX:</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L211" class="LineNr">211 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <a href='010vm.cc.html#L196'>name</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <a href='010vm.cc.html#L196'>name</a><span class="Delimiter">.</span><a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L212" class="LineNr">212 </span> cerr << <span class="Constant">" "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L213" class="LineNr">213 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <a href='010vm.cc.html#L197'>name_0f</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <a href='010vm.cc.html#L197'>name_0f</a><span class="Delimiter">.</span><a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L214" class="LineNr">214 </span> cerr << <span class="Constant">" 0f "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L215" class="LineNr">215 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <a href='010vm.cc.html#L198'>name_f3</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <a href='010vm.cc.html#L198'>name_f3</a><span class="Delimiter">.</span><a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L216" class="LineNr">216 </span> cerr << <span class="Constant">" f3 "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L217" class="LineNr">217 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <a href='010vm.cc.html#L199'>name_f3_0f</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <a href='010vm.cc.html#L199'>name_f3_0f</a><span class="Delimiter">.</span><a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L218" class="LineNr">218 </span> cerr << <span class="Constant">" f3 0f "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L219" class="LineNr">219 </span> cerr << <span class="Constant">"Run `subx help instructions` for details on <a href='011run.cc.html#L109'>words</a> like 'r32' and 'disp8'.</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L220" class="LineNr">220 </span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L221" class="LineNr">221 </span><span class="Delimiter">}</span>
<span id="L222" class="LineNr">222 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Contents")</span>
<span id="L223" class="LineNr">223 </span>cerr << <span class="Constant">" opcodes</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L224" class="LineNr">224 </span>
<span id="L225" class="LineNr">225 </span><span class="Delimiter">:(before "End Includes")</span>
<span id="L226" class="LineNr">226 </span><span class="Comment">#include <iomanip></span>
<span id="L227" class="LineNr">227 </span><span class="Comment">#define HEXBYTE std::hex << std::setw(2) << std::setfill('0')</span>
<span id="L228" class="LineNr">228 </span><span class="Comment">#define HEXWORD std::hex << std::setw(8) << std::setfill('0')</span>
<span id="L229" class="LineNr">229 </span><span class="Comment">// ugly that iostream doesn't print uint8_t as an integer</span>
<span id="L230" class="LineNr">230 </span><span class="Comment">#define NUM(X) static_cast<int>(X)</span>
<span id="L231" class="LineNr">231 </span><span class="Comment">#include <stdint.h></span>
</pre>
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