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| author | Kartik Agaram <vc@akkartik.com> | 2018-08-04 17:00:27 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-08-04 17:00:27 -0700 |
| commit | bb2b6ba7fd72bbebc3a4490d090f080e7b8628cc (patch) | |
| tree | 2a8e0697887f3028b3b9042b62fa57064537bd87 /html/subx/016index_addressing.cc.html | |
| parent | 6cabcefe67d2cd0583b556129fe3d8c89cf0fcb8 (diff) | |
| download | mu-bb2b6ba7fd72bbebc3a4490d090f080e7b8628cc.tar.gz | |
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Diffstat (limited to 'html/subx/016index_addressing.cc.html')
| -rw-r--r-- | html/subx/016index_addressing.cc.html | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/html/subx/016index_addressing.cc.html b/html/subx/016index_addressing.cc.html new file mode 100644 index 00000000..1fe7ab8f --- /dev/null +++ b/html/subx/016index_addressing.cc.html @@ -0,0 +1,191 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<html> +<head> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<title>Mu - subx/016index_addressing.cc</title> +<meta name="Generator" content="Vim/7.4"> +<meta name="plugin-version" content="vim7.4_v2"> +<meta name="syntax" content="cpp"> +<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> +<meta name="colorscheme" content="minimal"> +<style type="text/css"> +<!-- +pre { white-space: pre-wrap; font-family: monospace; color: #aaaaaa; background-color: #080808; } +body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; } +a { color:#eeeeee; text-decoration: none; } +a:hover { text-decoration: underline; } +* { font-size: 12pt; font-size: 1em; } +.Constant { color: #00a0a0; } +.Special { color: #c00000; } +.Comment { color: #9090ff; } +.Comment a { color:#0000ee; text-decoration:underline; } +.Delimiter { color: #800080; } +.LineNr { color: #444444; } +.Identifier { color: #c0a020; } +.Normal { color: #aaaaaa; background-color: #080808; padding-bottom: 1px; } +.PreProc { color: #800080; } +.traceContains { color: #008000; } +.Error { color: #ffffff; background-color: #ff6060; padding-bottom: 1px; } +--> +</style> + +<script type='text/javascript'> +<!-- + +/* function to open any folds containing a jumped-to line before jumping to it */ +function JumpToLine() +{ + var lineNum; + lineNum = window.location.hash; + lineNum = lineNum.substr(1); /* strip off '#' */ + + if (lineNum.indexOf('L') == -1) { + lineNum = 'L'+lineNum; + } + lineElem = document.getElementById(lineNum); + /* Always jump to new location even if the line was hidden inside a fold, or + * we corrected the raw number to a line ID. + */ + if (lineElem) { + lineElem.scrollIntoView(true); + } + return true; +} +if ('onhashchange' in window) { + window.onhashchange = JumpToLine; +} + +--> +</script> +</head> +<body onload='JumpToLine();'> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: operating on memory at the address provided by some register plus optional scale and offset</span> +<span id="L2" class="LineNr"> 2 </span> +<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(scenario add_r32_to_mem_at_r32_with_sib)</span> +<span id="L4" class="LineNr"> 4 </span><span class="Special">% Reg[EBX].i = 0x10;</span> +<span id="L5" class="LineNr"> 5 </span><span class="Special">% Reg[EAX].i = 0x60;</span> +<span id="L6" class="LineNr"> 6 </span>== <span class="Constant">0x1</span> <span class="Comment"># code segment</span> +<span id="L7" class="LineNr"> 7 </span><span class="Comment"># op ModR/M SIB displacement immediate</span> +<span id="L8" class="LineNr"> 8 </span> <span class="PreProc">0</span><span class="Constant">1</span> 1c <span class="Constant">20</span> <span class="Comment"># add EBX to *EAX</span> +<span id="L9" class="LineNr"> 9 </span><span class="Comment"># ModR/M in binary: 00 (indirect mode) 011 (src EBX) 100 (dest in SIB)</span> +<span id="L10" class="LineNr"> 10 </span><span class="Comment"># SIB in binary: 00 (scale 1) 100 (no index) 000 (base EAX)</span> +<span id="L11" class="LineNr"> 11 </span>== <span class="Constant">0x60</span> <span class="Comment"># data segment</span> +<span id="L12" class="LineNr"> 12 </span><span class="PreProc">0</span><span class="Constant">1</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># 1</span> +<span id="L13" class="LineNr"> 13 </span><span class="traceContains">+run: add <a href='010vm.cc.html#L16'>EBX</a> to r/m32</span> +<span id="L14" class="LineNr"> 14 </span><span class="traceContains">+run: effective address is initially 0x60 (EAX)</span> +<span id="L15" class="LineNr"> 15 </span><span class="traceContains">+run: effective address is 0x60</span> +<span id="L16" class="LineNr"> 16 </span><span class="traceContains">+run: storing 0x00000011</span> +<span id="L17" class="LineNr"> 17 </span> +<span id="L18" class="LineNr"> 18 </span><span class="Delimiter">:(before "End Mod 0 Special-cases(addr)")</span> +<span id="L19" class="LineNr"> 19 </span><span class="Normal">case</span> <span class="Constant">4</span>: <span class="Comment">// exception: mod 0b00 rm 0b100 => incoming SIB (scale-index-base) byte</span> +<span id="L20" class="LineNr"> 20 </span> addr = <a href='016index_addressing.cc.html#L23'>effective_address_from_sib</a><span class="Delimiter">(</span>mod<span class="Delimiter">);</span> +<span id="L21" class="LineNr"> 21 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> +<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">:(code)</span> +<span id="L23" class="LineNr"> 23 </span><span class="Normal">uint32_t</span> <a href='016index_addressing.cc.html#L23'>effective_address_from_sib</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span> mod<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L24" class="LineNr"> 24 </span> <span class="Normal">uint8_t</span> sib = <a href='010vm.cc.html#L193'>next</a><span class="Delimiter">();</span> +<span id="L25" class="LineNr"> 25 </span> <span class="Normal">uint8_t</span> base = sib&<span class="Constant">0x7</span><span class="Delimiter">;</span> +<span id="L26" class="LineNr"> 26 </span> <span class="Normal">uint32_t</span> addr = <span class="Constant">0</span><span class="Delimiter">;</span> +<span id="L27" class="LineNr"> 27 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>base != <a href='010vm.cc.html#L18'>EBP</a> || mod != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L28" class="LineNr"> 28 </span> addr = Reg[base]<span class="Delimiter">.</span>u<span class="Delimiter">;</span> +<span id="L29" class="LineNr"> 29 </span> <a href='003trace.cc.html#L190'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"effective address is initially 0x"</span> << std::hex << addr << <span class="Constant">" ("</span> << <a href='013direct_addressing.cc.html#L50'>rname</a><span class="Delimiter">(</span>base<span class="Delimiter">)</span> << <span class="Constant">")"</span> << <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span> +<span id="L30" class="LineNr"> 30 </span> <span class="Delimiter">}</span> +<span id="L31" class="LineNr"> 31 </span> <span class="Normal">else</span> <span class="Delimiter">{</span> +<span id="L32" class="LineNr"> 32 </span> <span class="Comment">// base == EBP && mod == 0</span> +<span id="L33" class="LineNr"> 33 </span> addr = <a href='011run.cc.html#L253'>imm32</a><span class="Delimiter">();</span> <span class="Comment">// ignore base</span> +<span id="L34" class="LineNr"> 34 </span> <a href='003trace.cc.html#L190'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"effective address is initially 0x"</span> << std::hex << addr << <span class="Constant">" (disp32)"</span> << <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span> +<span id="L35" class="LineNr"> 35 </span> <span class="Delimiter">}</span> +<span id="L36" class="LineNr"> 36 </span> <span class="Normal">uint8_t</span> index = <span class="Delimiter">(</span>sib>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span> +<span id="L37" class="LineNr"> 37 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>index == <a href='010vm.cc.html#L17'>ESP</a><span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L38" class="LineNr"> 38 </span> <span class="Comment">// ignore index and scale</span> +<span id="L39" class="LineNr"> 39 </span> <a href='003trace.cc.html#L190'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"effective address is 0x"</span> << std::hex << addr << <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span> +<span id="L40" class="LineNr"> 40 </span> <span class="Delimiter">}</span> +<span id="L41" class="LineNr"> 41 </span> <span class="Normal">else</span> <span class="Delimiter">{</span> +<span id="L42" class="LineNr"> 42 </span> <span class="Normal">uint8_t</span> scale = <span class="Delimiter">(</span><span class="Constant">1</span> << <span class="Delimiter">(</span>sib>><span class="Constant">6</span><span class="Delimiter">));</span> +<span id="L43" class="LineNr"> 43 </span> addr += Reg[index]<span class="Delimiter">.</span>i*scale<span class="Delimiter">;</span> <span class="Comment">// treat index register as signed. Maybe base as well? But we'll always ensure it's non-negative.</span> +<span id="L44" class="LineNr"> 44 </span> <a href='003trace.cc.html#L190'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"effective address is 0x"</span> << std::hex << addr << <span class="Constant">" (after adding "</span> << <a href='013direct_addressing.cc.html#L50'>rname</a><span class="Delimiter">(</span>index<span class="Delimiter">)</span> << <span class="Constant">"*"</span> << <a href='010vm.cc.html#L241'>NUM</a><span class="Delimiter">(</span>scale<span class="Delimiter">)</span> << <span class="Constant">")"</span> << <a href='003trace.cc.html#L215'>end</a><span class="Delimiter">();</span> +<span id="L45" class="LineNr"> 45 </span> <span class="Delimiter">}</span> +<span id="L46" class="LineNr"> 46 </span> <span class="Identifier">return</span> addr<span class="Delimiter">;</span> +<span id="L47" class="LineNr"> 47 </span><span class="Delimiter">}</span> +<span id="L48" class="LineNr"> 48 </span> +<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">:(scenario add_r32_to_mem_at_base_r32_index_r32)</span> +<span id="L50" class="LineNr"> 50 </span><span class="Special">% Reg[EBX].i = 0x10; // source</span> +<span id="L51" class="LineNr"> 51 </span><span class="Special">% Reg[EAX].i = 0x5e; // dest base</span> +<span id="L52" class="LineNr"> 52 </span><span class="Special">% Reg[ECX].i = 0x2; // dest index</span> +<span id="L53" class="LineNr"> 53 </span>== <span class="Constant">0x1</span> <span class="Comment"># code segment</span> +<span id="L54" class="LineNr"> 54 </span><span class="Comment"># op ModR/M SIB displacement immediate</span> +<span id="L55" class="LineNr"> 55 </span> <span class="PreProc">0</span><span class="Constant">1</span> 1c <span class="Error">08</span> <span class="Comment"># add EBX to *(EAX+ECX)</span> +<span id="L56" class="LineNr"> 56 </span><span class="Comment"># ModR/M in binary: 00 (indirect mode) 011 (src EBX) 100 (dest in SIB)</span> +<span id="L57" class="LineNr"> 57 </span><span class="Comment"># SIB in binary: 00 (scale 1) 001 (index ECX) 000 (base EAX)</span> +<span id="L58" class="LineNr"> 58 </span>== <span class="Constant">0x60</span> <span class="Comment"># data segment</span> +<span id="L59" class="LineNr"> 59 </span><span class="PreProc">0</span><span class="Constant">1</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># 1</span> +<span id="L60" class="LineNr"> 60 </span><span class="traceContains">+run: add <a href='010vm.cc.html#L16'>EBX</a> to r/m32</span> +<span id="L61" class="LineNr"> 61 </span><span class="traceContains">+run: effective address is initially 0x5e (EAX)</span> +<span id="L62" class="LineNr"> 62 </span><span class="traceContains">+run: effective address is 0x60 (after adding ECX*1)</span> +<span id="L63" class="LineNr"> 63 </span><span class="traceContains">+run: storing 0x00000011</span> +<span id="L64" class="LineNr"> 64 </span> +<span id="L65" class="LineNr"> 65 </span><span class="Delimiter">:(scenario add_r32_to_mem_at_displacement_using_sib)</span> +<span id="L66" class="LineNr"> 66 </span><span class="Special">% Reg[EBX].i = 0x10; // source</span> +<span id="L67" class="LineNr"> 67 </span>== <span class="Constant">0x1</span> <span class="Comment"># code segment</span> +<span id="L68" class="LineNr"> 68 </span><span class="Comment"># op ModR/M SIB displacement immediate</span> +<span id="L69" class="LineNr"> 69 </span> <span class="PreProc">0</span><span class="Constant">1</span> 1c <span class="Constant">25</span> <span class="Constant">60</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># add EBX to *0x60</span> +<span id="L70" class="LineNr"> 70 </span><span class="Comment"># ModR/M in binary: 00 (indirect mode) 011 (src EBX) 100 (dest in SIB)</span> +<span id="L71" class="LineNr"> 71 </span><span class="Comment"># SIB in binary: 00 (scale 1) 100 (no index) 101 (not EBP but disp32)</span> +<span id="L72" class="LineNr"> 72 </span>== <span class="Constant">0x60</span> <span class="Comment"># data segment</span> +<span id="L73" class="LineNr"> 73 </span><span class="PreProc">0</span><span class="Constant">1</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># 1</span> +<span id="L74" class="LineNr"> 74 </span><span class="traceContains">+run: add <a href='010vm.cc.html#L16'>EBX</a> to r/m32</span> +<span id="L75" class="LineNr"> 75 </span><span class="traceContains">+run: effective address is initially 0x60 (disp32)</span> +<span id="L76" class="LineNr"> 76 </span><span class="traceContains">+run: effective address is 0x60</span> +<span id="L77" class="LineNr"> 77 </span><span class="traceContains">+run: storing 0x00000011</span> +<span id="L78" class="LineNr"> 78 </span> +<span id="L79" class="LineNr"> 79 </span><span class="Comment">//:</span> +<span id="L80" class="LineNr"> 80 </span> +<span id="L81" class="LineNr"> 81 </span><span class="Delimiter">:(scenario add_r32_to_mem_at_base_r32_index_r32_plus_disp8)</span> +<span id="L82" class="LineNr"> 82 </span><span class="Special">% Reg[EBX].i = 0x10; // source</span> +<span id="L83" class="LineNr"> 83 </span><span class="Special">% Reg[EAX].i = 0x59; // dest base</span> +<span id="L84" class="LineNr"> 84 </span><span class="Special">% Reg[ECX].i = 0x5; // dest index</span> +<span id="L85" class="LineNr"> 85 </span>== <span class="Constant">0x1</span> <span class="Comment"># code segment</span> +<span id="L86" class="LineNr"> 86 </span><span class="Comment"># op ModR/M SIB displacement immediate</span> +<span id="L87" class="LineNr"> 87 </span> <span class="PreProc">0</span><span class="Constant">1</span> 5c <span class="Error">08</span> <span class="PreProc">0</span><span class="Constant">2</span> <span class="Comment"># add EBX to *(EAX+ECX+2)</span> +<span id="L88" class="LineNr"> 88 </span><span class="Comment"># ModR/M in binary: 01 (indirect+disp8 mode) 011 (src EBX) 100 (dest in SIB)</span> +<span id="L89" class="LineNr"> 89 </span><span class="Comment"># SIB in binary: 00 (scale 1) 001 (index ECX) 000 (base EAX)</span> +<span id="L90" class="LineNr"> 90 </span>== <span class="Constant">0x60</span> <span class="Comment"># data segment</span> +<span id="L91" class="LineNr"> 91 </span><span class="PreProc">0</span><span class="Constant">1</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># 1</span> +<span id="L92" class="LineNr"> 92 </span><span class="traceContains">+run: add <a href='010vm.cc.html#L16'>EBX</a> to r/m32</span> +<span id="L93" class="LineNr"> 93 </span><span class="traceContains">+run: effective address is initially 0x59 (EAX)</span> +<span id="L94" class="LineNr"> 94 </span><span class="traceContains">+run: effective address is 0x5e (after adding ECX*1)</span> +<span id="L95" class="LineNr"> 95 </span><span class="traceContains">+run: effective address is 0x60 (after adding disp8)</span> +<span id="L96" class="LineNr"> 96 </span><span class="traceContains">+run: storing 0x00000011</span> +<span id="L97" class="LineNr"> 97 </span> +<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(before "End Mod 1 Special-cases(addr)")</span> +<span id="L99" class="LineNr"> 99 </span><span class="Normal">case</span> <span class="Constant">4</span>: <span class="Comment">// exception: mod 0b01 rm 0b100 => incoming SIB (scale-index-base) byte</span> +<span id="L100" class="LineNr">100 </span> addr = <a href='016index_addressing.cc.html#L23'>effective_address_from_sib</a><span class="Delimiter">(</span>mod<span class="Delimiter">);</span> +<span id="L101" class="LineNr">101 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> +<span id="L102" class="LineNr">102 </span> +<span id="L103" class="LineNr">103 </span><span class="Comment">//:</span> +<span id="L104" class="LineNr">104 </span> +<span id="L105" class="LineNr">105 </span><span class="Delimiter">:(scenario add_r32_to_mem_at_base_r32_index_r32_plus_disp32)</span> +<span id="L106" class="LineNr">106 </span><span class="Special">% Reg[EBX].i = 0x10; // source</span> +<span id="L107" class="LineNr">107 </span><span class="Special">% Reg[EAX].i = 0x59; // dest base</span> +<span id="L108" class="LineNr">108 </span><span class="Special">% Reg[ECX].i = 0x5; // dest index</span> +<span id="L109" class="LineNr">109 </span>== <span class="Constant">0x1</span> <span class="Comment"># code segment</span> +<span id="L110" class="LineNr">110 </span><span class="Comment"># op ModR/M SIB displacement immediate</span> +<span id="L111" class="LineNr">111 </span> <span class="PreProc">0</span><span class="Constant">1</span> 9c <span class="Error">08</span> <span class="PreProc">0</span><span class="Constant">2</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># add EBX to *(EAX+ECX+2)</span> +<span id="L112" class="LineNr">112 </span><span class="Comment"># ModR/M in binary: 10 (indirect+disp32 mode) 011 (src EBX) 100 (dest in SIB)</span> +<span id="L113" class="LineNr">113 </span><span class="Comment"># SIB in binary: 00 (scale 1) 001 (index ECX) 000 (base EAX)</span> +<span id="L114" class="LineNr">114 </span>== <span class="Constant">0x60</span> <span class="Comment"># data segment</span> +<span id="L115" class="LineNr">115 </span><span class="PreProc">0</span><span class="Constant">1</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="Comment"># 1</span> +<span id="L116" class="LineNr">116 </span><span class="traceContains">+run: add <a href='010vm.cc.html#L16'>EBX</a> to r/m32</span> +<span id="L117" class="LineNr">117 </span><span class="traceContains">+run: effective address is initially 0x59 (EAX)</span> +<span id="L118" class="LineNr">118 </span><span class="traceContains">+run: effective address is 0x5e (after adding ECX*1)</span> +<span id="L119" class="LineNr">119 </span><span class="traceContains">+run: effective address is 0x60 (after adding disp32)</span> +<span id="L120" class="LineNr">120 </span><span class="traceContains">+run: storing 0x00000011</span> +<span id="L121" class="LineNr">121 </span> +<span id="L122" class="LineNr">122 </span><span class="Delimiter">:(before "End Mod 2 Special-cases(addr)")</span> +<span id="L123" class="LineNr">123 </span><span class="Normal">case</span> <span class="Constant">4</span>: <span class="Comment">// exception: mod 0b10 rm 0b100 => incoming SIB (scale-index-base) byte</span> +<span id="L124" class="LineNr">124 </span> addr = <a href='016index_addressing.cc.html#L23'>effective_address_from_sib</a><span class="Delimiter">(</span>mod<span class="Delimiter">);</span> +<span id="L125" class="LineNr">125 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |