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Diffstat (limited to 'html/subx/053new_segment.subx.html')
| -rw-r--r-- | html/subx/053new_segment.subx.html | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/html/subx/053new_segment.subx.html b/html/subx/053new_segment.subx.html deleted file mode 100644 index df60c22a..00000000 --- a/html/subx/053new_segment.subx.html +++ /dev/null @@ -1,126 +0,0 @@ -<!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/053new_segment.subx</title> -<meta name="Generator" content="Vim/8.0"> -<meta name="plugin-version" content="vim7.4_v2"> -<meta name="syntax" content="none"> -<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> -<meta name="colorscheme" content="minimal-light"> -<style type="text/css"> -<!-- -pre { 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; } -.subxS2Comment { color: #8a8a8a; } -.subxMinorFunction { color: #875f5f; } -.LineNr { } -.subxS1Comment { color: #0000af; } -.subxFunction { color: #af5f00; text-decoration: underline; } -.Constant { color: #008787; } -.Normal { color: #000000; background-color: #c6c6c6; 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();'> -<a href='https://github.com/akkartik/mu/blob/master/subx/053new_segment.subx'>https://github.com/akkartik/mu/blob/master/subx/053new_segment.subx</a> -<pre id='vimCodeElement'> -<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Create a new segment (for data) using mmap().</span> -<span id="L2" class="LineNr"> 2 </span> -<span id="L3" class="LineNr"> 3 </span>== code -<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># instruction effective address register displacement immediate</span> -<span id="L5" class="LineNr"> 5 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span> -<span id="L6" class="LineNr"> 6 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span> -<span id="L7" class="LineNr"> 7 </span> -<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># main: (manual test if this is the last file loaded)</span> -<span id="L9" class="LineNr"> 9 </span> <span class="subxComment"># EAX = new-segment(0x1000)</span> -<span id="L10" class="LineNr">10 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L11" class="LineNr">11 </span> 68/push 0x1000/imm32 -<span id="L12" class="LineNr">12 </span> <span class="subxS2Comment"># . . call</span> -<span id="L13" class="LineNr">13 </span> e8/call <a href='053new_segment.subx.html#L25'>new-segment</a>/disp32 -<span id="L14" class="LineNr">14 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L15" class="LineNr">15 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> -<span id="L16" class="LineNr">16 </span> -<span id="L17" class="LineNr">17 </span> <span class="subxComment"># write to *EAX to check that we have access to the newly-allocated segment</span> -<span id="L18" class="LineNr">18 </span> c7 0/subop/copy 0/mod/direct 0/rm32/EAX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x34/imm32 <span class="subxComment"># copy to *EAX</span> -<span id="L19" class="LineNr">19 </span> -<span id="L20" class="LineNr">20 </span> <span class="subxComment"># syscall(exit, EAX)</span> -<span id="L21" class="LineNr">21 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/EAX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EAX to EBX</span> -<span id="L22" class="LineNr">22 </span> b8/copy-to-EAX 1/imm32/exit -<span id="L23" class="LineNr">23 </span> cd/syscall 0x80/imm8 -<span id="L24" class="LineNr">24 </span> -<span id="L25" class="LineNr">25 </span><span class="subxFunction">new-segment</span>: <span class="subxComment"># len : int -> address</span> -<span id="L26" class="LineNr">26 </span> <span class="subxS1Comment"># . prolog</span> -<span id="L27" class="LineNr">27 </span> 55/push-EBP -<span id="L28" class="LineNr">28 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBP</span> -<span id="L29" class="LineNr">29 </span> 53/push-EBX -<span id="L30" class="LineNr">30 </span> <span class="subxComment"># copy len to _mmap-new-segment->len</span> -<span id="L31" class="LineNr">31 </span> <span class="subxComment"># TODO: compute _mmap-new-segment+4 before runtime</span> -<span id="L32" class="LineNr">32 </span> 8b/copy 1/mod/*+disp8 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/EAX 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(EBP+8) to EAX</span> -<span id="L33" class="LineNr">33 </span> bb/copy-to-EBX <a href='053new_segment.subx.html#L49'>_mmap-new-segment</a>/imm32 -<span id="L34" class="LineNr">34 </span> 89/copy 1/mod/*+disp8 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/EAX 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy EAX to *(EBX+4)</span> -<span id="L35" class="LineNr">35 </span> <span class="subxComment"># mmap(_mmap-new-segment)</span> -<span id="L36" class="LineNr">36 </span> bb/copy-to-EBX <a href='053new_segment.subx.html#L49'>_mmap-new-segment</a>/imm32 -<span id="L37" class="LineNr">37 </span> b8/copy-to-EAX 0x5a/imm32/mmap -<span id="L38" class="LineNr">38 </span> cd/syscall 0x80/imm8 -<span id="L39" class="LineNr">39 </span><span class="Constant">$new-segment:end</span>: -<span id="L40" class="LineNr">40 </span> <span class="subxS1Comment"># . epilog</span> -<span id="L41" class="LineNr">41 </span> 5b/pop-to-EBX -<span id="L42" class="LineNr">42 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> -<span id="L43" class="LineNr">43 </span> 5d/pop-to-EBP -<span id="L44" class="LineNr">44 </span> c3/return -<span id="L45" class="LineNr">45 </span> -<span id="L46" class="LineNr">46 </span>== data -<span id="L47" class="LineNr">47 </span> -<span id="L48" class="LineNr">48 </span><span class="subxComment"># various constants used here were found in the Linux sources (search for file mman-common.h)</span> -<span id="L49" class="LineNr">49 </span><span class="subxMinorFunction">_mmap-new-segment</span>: <span class="subxComment"># type mmap_arg_struct</span> -<span id="L50" class="LineNr">50 </span> <span class="subxComment"># addr</span> -<span id="L51" class="LineNr">51 </span> 00 00 00 00 <span class="subxComment"># null</span> -<span id="L52" class="LineNr">52 </span> <span class="subxComment"># len</span> -<span id="L53" class="LineNr">53 </span> 00 00 00 00 <span class="subxComment"># 0x1000</span> -<span id="L54" class="LineNr">54 </span> <span class="subxComment"># protection flags</span> -<span id="L55" class="LineNr">55 </span> 03 00 00 00 <span class="subxComment"># PROT_READ | PROT_WRITE</span> -<span id="L56" class="LineNr">56 </span> <span class="subxComment"># sharing flags</span> -<span id="L57" class="LineNr">57 </span> 22 00 00 00 <span class="subxComment"># MAP_PRIVATE | MAP_ANONYMOUS</span> -<span id="L58" class="LineNr">58 </span> <span class="subxComment"># fd</span> -<span id="L59" class="LineNr">59 </span> ff ff ff ff <span class="subxComment"># -1 since MAP_ANONYMOUS is specified</span> -<span id="L60" class="LineNr">60 </span> <span class="subxComment"># offset</span> -<span id="L61" class="LineNr">61 </span> 00 00 00 00 <span class="subxComment"># 0 since MAP_ANONYMOUS is specified</span> -<span id="L62" class="LineNr">62 </span> -<span id="L63" class="LineNr">63 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> -</pre> -</body> -</html> -<!-- vim: set foldmethod=manual : --> |