diff options
Diffstat (limited to 'html/baremetal/103grapheme.subx.html')
| -rw-r--r-- | html/baremetal/103grapheme.subx.html | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/html/baremetal/103grapheme.subx.html b/html/baremetal/103grapheme.subx.html new file mode 100644 index 00000000..b34168d6 --- /dev/null +++ b/html/baremetal/103grapheme.subx.html @@ -0,0 +1,130 @@ +<!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 - baremetal/103grapheme.subx</title> +<meta name="Generator" content="Vim/8.1"> +<meta name="plugin-version" content="vim8.1_v1"> +<meta name="syntax" content="none"> +<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> +<meta name="colorscheme" content="minimal-light"> +<style type="text/css"> +<!-- +pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; } +body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; } +a { color:inherit; } +* { font-size:12pt; font-size: 1em; } +.subxComment { color: #005faf; } +.LineNr { } +.subxS1Comment { color: #0000af; } +.subxFunction { color: #af5f00; text-decoration: underline; } +.Constant { color: #008787; } +--> +</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; + } + var 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();'> +<a href='https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx'>https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx</a> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="subxFunction">draw-grapheme</span>: <span class="subxComment"># screen: (addr screen), g: grapheme, x: int, y: int, color: int</span> +<span id="L2" class="LineNr"> 2 </span> <span class="subxS1Comment"># . prologue</span> +<span id="L3" class="LineNr"> 3 </span> 55/push-ebp +<span id="L4" class="LineNr"> 4 </span> 89/<- %ebp 4/r32/esp +<span id="L5" class="LineNr"> 5 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L6" class="LineNr"> 6 </span> 50/push-eax +<span id="L7" class="LineNr"> 7 </span> 51/push-ecx +<span id="L8" class="LineNr"> 8 </span> 52/push-edx +<span id="L9" class="LineNr"> 9 </span> 53/push-ebx +<span id="L10" class="LineNr">10 </span> 56/push-esi +<span id="L11" class="LineNr">11 </span> <span class="subxComment"># var letter-bitmap/esi = font[g]</span> +<span id="L12" class="LineNr">12 </span> 8b/-> *(ebp+0xc) 6/r32/esi +<span id="L13" class="LineNr">13 </span> c1 4/subop/shift-left %esi 4/imm8 +<span id="L14" class="LineNr">14 </span> 8d/copy-address *(esi+0x8800) 6/r32/esi <span class="subxComment"># font-start</span> +<span id="L15" class="LineNr">15 </span> <span class="subxComment"># if (letter-bitmap >= 0x9000) return # characters beyond ASCII currently not supported</span> +<span id="L16" class="LineNr">16 </span> 81 7/subop/compare %esi 0x9000/imm32 +<span id="L17" class="LineNr">17 </span> 7d/jump-if->= $draw-grapheme:end/disp8 +<span id="L18" class="LineNr">18 </span> <span class="subxComment"># edx = y</span> +<span id="L19" class="LineNr">19 </span> 8b/-> *(ebp+0x14) 2/r32/edx +<span id="L20" class="LineNr">20 </span> <span class="subxComment"># var ymax/ebx: int = y + 16</span> +<span id="L21" class="LineNr">21 </span> 8b/-> *(ebp+0x14) 3/r32/ebx +<span id="L22" class="LineNr">22 </span> 81 0/subop/add %ebx 0x10/imm32 +<span id="L23" class="LineNr">23 </span> { +<span id="L24" class="LineNr">24 </span> <span class="subxComment"># if (y >= ymax) break</span> +<span id="L25" class="LineNr">25 </span> 39/compare %edx 3/r32/ebx +<span id="L26" class="LineNr">26 </span> 7d/jump-if->= <span class="Constant">break</span>/disp8 +<span id="L27" class="LineNr">27 </span> <span class="subxComment"># eax = x + 7</span> +<span id="L28" class="LineNr">28 </span> 8b/-> *(ebp+0x10) 0/r32/eax +<span id="L29" class="LineNr">29 </span> 81 0/subop/add %eax 7/imm32 +<span id="L30" class="LineNr">30 </span> <span class="subxComment"># var xmin/ecx: int = x</span> +<span id="L31" class="LineNr">31 </span> 8b/-> *(ebp+0x10) 1/r32/ecx +<span id="L32" class="LineNr">32 </span> <span class="subxComment"># var row-bitmap/ebx: int = *letter-bitmap</span> +<span id="L33" class="LineNr">33 </span> 53/push-ebx +<span id="L34" class="LineNr">34 </span> 8b/-> *esi 3/r32/ebx +<span id="L35" class="LineNr">35 </span> { +<span id="L36" class="LineNr">36 </span> <span class="subxComment"># if (x < xmin) break</span> +<span id="L37" class="LineNr">37 </span> 39/compare %eax 1/r32/ecx +<span id="L38" class="LineNr">38 </span> 7c/jump-if-< <span class="Constant">break</span>/disp8 +<span id="L39" class="LineNr">39 </span> <span class="subxComment"># shift LSB from row-bitmap into carry flag (CF)</span> +<span id="L40" class="LineNr">40 </span> c1 5/subop/shift-right-logical %ebx 1/imm8 +<span id="L41" class="LineNr">41 </span> <span class="subxComment"># if LSB, draw a pixel</span> +<span id="L42" class="LineNr">42 </span> { +<span id="L43" class="LineNr">43 </span> 73/jump-if-not-CF <span class="Constant">break</span>/disp8 +<span id="L44" class="LineNr">44 </span> (<a href='101screen.subx.html#L3'>pixel</a> *(ebp+8) %eax %edx *(ebp+0x18)) +<span id="L45" class="LineNr">45 </span> } +<span id="L46" class="LineNr">46 </span> <span class="subxComment"># --x</span> +<span id="L47" class="LineNr">47 </span> 48/decrement-eax +<span id="L48" class="LineNr">48 </span> <span class="subxComment">#</span> +<span id="L49" class="LineNr">49 </span> eb/jump <span class="Constant">loop</span>/disp8 +<span id="L50" class="LineNr">50 </span> } +<span id="L51" class="LineNr">51 </span> <span class="subxComment"># reclaim row-bitmap</span> +<span id="L52" class="LineNr">52 </span> 5b/pop-to-ebx +<span id="L53" class="LineNr">53 </span> <span class="subxComment"># ++y</span> +<span id="L54" class="LineNr">54 </span> 42/increment-edx +<span id="L55" class="LineNr">55 </span> <span class="subxComment"># next bitmap row</span> +<span id="L56" class="LineNr">56 </span> 46/increment-esi +<span id="L57" class="LineNr">57 </span> <span class="subxComment">#</span> +<span id="L58" class="LineNr">58 </span> eb/jump <span class="Constant">loop</span>/disp8 +<span id="L59" class="LineNr">59 </span> } +<span id="L60" class="LineNr">60 </span><span class="Constant">$draw-grapheme:end</span>: +<span id="L61" class="LineNr">61 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L62" class="LineNr">62 </span> 5e/pop-to-esi +<span id="L63" class="LineNr">63 </span> 5b/pop-to-ebx +<span id="L64" class="LineNr">64 </span> 5a/pop-to-edx +<span id="L65" class="LineNr">65 </span> 59/pop-to-ecx +<span id="L66" class="LineNr">66 </span> 58/pop-to-eax +<span id="L67" class="LineNr">67 </span> <span class="subxS1Comment"># . epilogue</span> +<span id="L68" class="LineNr">68 </span> 89/<- %esp 5/r32/ebp +<span id="L69" class="LineNr">69 </span> 5d/pop-to-ebp +<span id="L70" class="LineNr">70 </span> c3/return +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |