blob: f03dd4c922050f6f09769dfbcb4dc2fbd5fa5119 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
<!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 - 303kernel-string.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; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.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/master/303kernel-string.subx'>https://github.com/akkartik/mu/blob/master/303kernel-string.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># We can't really do much with null-terminated kernel strings, and we don't</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># want to. Let's turn them into regular length-prefixed strings at the first</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># opportunity.</span>
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span>== code
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="subxFunction">kernel-string-to-string</span>: <span class="subxComment"># ad: (addr allocation-descriptor), in: (addr kernel-string), out: (addr handle array byte)</span>
<span id="L8" class="LineNr"> 8 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L9" class="LineNr"> 9 </span> 55/push-ebp
<span id="L10" class="LineNr">10 </span> 89/<- %ebp 4/r32/esp
<span id="L11" class="LineNr">11 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L12" class="LineNr">12 </span> 51/push-ecx
<span id="L13" class="LineNr">13 </span> 52/push-edx
<span id="L14" class="LineNr">14 </span> 53/push-ebx
<span id="L15" class="LineNr">15 </span> 56/push-esi
<span id="L16" class="LineNr">16 </span> 57/push-edi
<span id="L17" class="LineNr">17 </span> <span class="subxComment"># var len/ecx: int = length(in)</span>
<span id="L18" class="LineNr">18 </span> (<a href='303kernel-string.subx.html#L57'>kernel-string-length</a> *(ebp+0xc))
<span id="L19" class="LineNr">19 </span> 89/<- %ecx 0/r32/eax
<span id="L20" class="LineNr">20 </span> <span class="subxComment"># result = allocate-array(ad, len)</span>
<span id="L21" class="LineNr">21 </span> (<a href='120allocate.subx.html#L576'>allocate-array</a> *(ebp+8) %ecx *(ebp+0x10))
<span id="L22" class="LineNr">22 </span> <span class="subxComment"># var c/edx: byte = 0</span>
<span id="L23" class="LineNr">23 </span> ba/copy-to-edx 0/imm32
<span id="L24" class="LineNr">24 </span> <span class="subxComment"># var src/esi: (addr byte) = in</span>
<span id="L25" class="LineNr">25 </span> 8b/-> *(ebp+0xc) 6/r32/esi
<span id="L26" class="LineNr">26 </span> <span class="subxComment"># var dest/edi: (addr byte) = result->data</span>
<span id="L27" class="LineNr">27 </span> 8b/-> *(ebp+0x10) 7/r32/edi
<span id="L28" class="LineNr">28 </span> (<a href='120allocate.subx.html#L256'>lookup</a> *edi *(edi+4)) <span class="subxComment"># => eax</span>
<span id="L29" class="LineNr">29 </span> 8d/copy-address *(eax+4) 7/r32/edi
<span id="L30" class="LineNr">30 </span> {
<span id="L31" class="LineNr">31 </span><span class="Constant">$kernel-string-to-string:loop</span>:
<span id="L32" class="LineNr">32 </span> <span class="subxComment"># c = *src</span>
<span id="L33" class="LineNr">33 </span> 8a/byte-> *esi 2/r32/dl
<span id="L34" class="LineNr">34 </span> <span class="subxComment"># if (c == 0) break</span>
<span id="L35" class="LineNr">35 </span> 81 7/subop/compare %edx 0/imm32
<span id="L36" class="LineNr">36 </span> 74/jump-if-= <span class="Constant">break</span>/disp8
<span id="L37" class="LineNr">37 </span> <span class="subxComment"># *dest = c</span>
<span id="L38" class="LineNr">38 </span> 88/byte<- *edi 2/r32/dl
<span id="L39" class="LineNr">39 </span> <span class="subxComment"># ++src</span>
<span id="L40" class="LineNr">40 </span> 46/increment-esi
<span id="L41" class="LineNr">41 </span> <span class="subxComment"># ++dest</span>
<span id="L42" class="LineNr">42 </span> 47/increment-edi
<span id="L43" class="LineNr">43 </span> eb/jump <span class="Constant">loop</span>/disp8
<span id="L44" class="LineNr">44 </span> }
<span id="L45" class="LineNr">45 </span><span class="Constant">$kernel-string-to-string:end</span>:
<span id="L46" class="LineNr">46 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L47" class="LineNr">47 </span> 5f/pop-to-edi
<span id="L48" class="LineNr">48 </span> 5e/pop-to-esi
<span id="L49" class="LineNr">49 </span> 5b/pop-to-ebx
<span id="L50" class="LineNr">50 </span> 5a/pop-to-edx
<span id="L51" class="LineNr">51 </span> 59/pop-to-ecx
<span id="L52" class="LineNr">52 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L53" class="LineNr">53 </span> 89/<- %esp 5/r32/ebp
<span id="L54" class="LineNr">54 </span> 5d/pop-to-ebp
<span id="L55" class="LineNr">55 </span> c3/return
<span id="L56" class="LineNr">56 </span>
<span id="L57" class="LineNr">57 </span><span class="subxFunction">kernel-string-length</span>: <span class="subxComment"># in: (addr kernel-string) -> result/eax: int</span>
<span id="L58" class="LineNr">58 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L59" class="LineNr">59 </span> 55/push-ebp
<span id="L60" class="LineNr">60 </span> 89/<- %ebp 4/r32/esp
<span id="L61" class="LineNr">61 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L62" class="LineNr">62 </span> 51/push-ecx
<span id="L63" class="LineNr">63 </span> 52/push-edx
<span id="L64" class="LineNr">64 </span> <span class="subxComment"># result = 0</span>
<span id="L65" class="LineNr">65 </span> b8/copy-to-eax 0/imm32
<span id="L66" class="LineNr">66 </span> <span class="subxComment"># var c/ecx: byte = 0</span>
<span id="L67" class="LineNr">67 </span> b9/copy-to-ecx 0/imm32
<span id="L68" class="LineNr">68 </span> <span class="subxComment"># var curr/edx: (addr byte) = in</span>
<span id="L69" class="LineNr">69 </span> 8b/-> *(ebp+8) 2/r32/edx
<span id="L70" class="LineNr">70 </span> {
<span id="L71" class="LineNr">71 </span><span class="Constant">$kernel-string-length:loop</span>:
<span id="L72" class="LineNr">72 </span> <span class="subxComment"># c = *curr</span>
<span id="L73" class="LineNr">73 </span> 8a/byte-> *edx 1/r32/ecx
<span id="L74" class="LineNr">74 </span> <span class="subxComment"># if (c == 0) break</span>
<span id="L75" class="LineNr">75 </span> 81 7/subop/compare %ecx 0/imm32
<span id="L76" class="LineNr">76 </span> 74/jump-if-= <span class="Constant">break</span>/disp8
<span id="L77" class="LineNr">77 </span> <span class="subxComment"># ++curr</span>
<span id="L78" class="LineNr">78 </span> 42/increment-edx
<span id="L79" class="LineNr">79 </span> <span class="subxComment"># ++result</span>
<span id="L80" class="LineNr">80 </span> 40/increment-eax
<span id="L81" class="LineNr">81 </span> <span class="subxComment">#</span>
<span id="L82" class="LineNr">82 </span> eb/jump <span class="Constant">loop</span>/disp8
<span id="L83" class="LineNr">83 </span> }
<span id="L84" class="LineNr">84 </span><span class="Constant">$kernel-string-length:end</span>:
<span id="L85" class="LineNr">85 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L86" class="LineNr">86 </span> 5a/pop-to-edx
<span id="L87" class="LineNr">87 </span> 59/pop-to-ecx
<span id="L88" class="LineNr">88 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L89" class="LineNr">89 </span> 89/<- %esp 5/r32/ebp
<span id="L90" class="LineNr">90 </span> 5d/pop-to-ebp
<span id="L91" class="LineNr">91 </span> c3/return
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|