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
|
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mu - linux/000init.subx</title>
<meta name="Generator" content="Vim/8.2">
<meta name="plugin-version" content="vim8.1_v2">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback">
<meta name="colorscheme" content="minimal-light">
<style>
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.subxComment { color: #005faf; }
.LineNr { }
.subxFunction { color: #af5f00; text-decoration: underline; }
-->
</style>
<script>
<!--
/* 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/linux/000init.subx'>https://github.com/akkartik/mu/blob/main/linux/000init.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Some OS-specific preliminaries for Linux.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># Memory layout</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># 0 - 0x08047ffff - reserved for the kernel</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># 0x08048000 - 0xbffffffff - available for user programs</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># 0xc0000000 - 0xfffffffff - reserved for the kernel</span>
<span id="L8" class="LineNr"> 8 </span>== code 0x09000000
<span id="L9" class="LineNr"> 9 </span>== data 0x0a000000
<span id="L10" class="LineNr">10 </span>
<span id="L11" class="LineNr">11 </span><span class="subxComment"># Syscalls</span>
<span id="L12" class="LineNr">12 </span><span class="subxComment">#</span>
<span id="L13" class="LineNr">13 </span><span class="subxComment"># We don't have libc, so we need to know Linux's precise syscall layout.</span>
<span id="L14" class="LineNr">14 </span><span class="subxComment"># These are not real functions. Pass arguments in specific registers.</span>
<span id="L15" class="LineNr">15 </span>== code
<span id="L16" class="LineNr">16 </span>
<span id="L17" class="LineNr">17 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/exit.2.html">http://man7.org/linux/man-pages/man2/exit.2.html</a></span>
<span id="L18" class="LineNr">18 </span><span class="subxFunction">syscall_exit</span>: <span class="subxComment"># status/ebx: int</span>
<span id="L19" class="LineNr">19 </span> b8/copy-to-eax 1/imm32
<span id="L20" class="LineNr">20 </span> cd/syscall 0x80/imm8
<span id="L21" class="LineNr">21 </span>
<span id="L22" class="LineNr">22 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/read.2.html">http://man7.org/linux/man-pages/man2/read.2.html</a></span>
<span id="L23" class="LineNr">23 </span><span class="subxFunction">syscall_read</span>: <span class="subxComment"># fd/ebx: int, buf/ecx: addr, size/edx: int -> nbytes-or-error/eax: int</span>
<span id="L24" class="LineNr">24 </span> b8/copy-to-eax 3/imm32
<span id="L25" class="LineNr">25 </span> cd/syscall 0x80/imm8
<span id="L26" class="LineNr">26 </span> c3/return
<span id="L27" class="LineNr">27 </span>
<span id="L28" class="LineNr">28 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/write.2.html">http://man7.org/linux/man-pages/man2/write.2.html</a></span>
<span id="L29" class="LineNr">29 </span><span class="subxFunction">syscall_write</span>: <span class="subxComment"># fd/ebx: int, buf/ecx: addr, size/edx: int -> nbytes-or-error/eax: int</span>
<span id="L30" class="LineNr">30 </span> b8/copy-to-eax 4/imm32
<span id="L31" class="LineNr">31 </span> cd/syscall 0x80/imm8
<span id="L32" class="LineNr">32 </span> c3/return
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/open.2.html">http://man7.org/linux/man-pages/man2/open.2.html</a></span>
<span id="L35" class="LineNr">35 </span><span class="subxFunction">syscall_open</span>: <span class="subxComment"># filename/ebx: (addr kernel-string), flags/ecx: int, dummy=0x180/edx -> fd-or-error/eax: int</span>
<span id="L36" class="LineNr">36 </span> b8/copy-to-eax 5/imm32
<span id="L37" class="LineNr">37 </span> cd/syscall 0x80/imm8
<span id="L38" class="LineNr">38 </span> c3/return
<span id="L39" class="LineNr">39 </span>
<span id="L40" class="LineNr">40 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/close.2.html">http://man7.org/linux/man-pages/man2/close.2.html</a></span>
<span id="L41" class="LineNr">41 </span><span class="subxFunction">syscall_close</span>: <span class="subxComment"># fd/ebx: int -> status/eax</span>
<span id="L42" class="LineNr">42 </span> b8/copy-to-eax 6/imm32
<span id="L43" class="LineNr">43 </span> cd/syscall 0x80/imm8
<span id="L44" class="LineNr">44 </span> c3/return
<span id="L45" class="LineNr">45 </span>
<span id="L46" class="LineNr">46 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/lseek.2.html">http://man7.org/linux/man-pages/man2/lseek.2.html</a></span>
<span id="L47" class="LineNr">47 </span><span class="subxFunction">syscall_lseek</span>: <span class="subxComment"># fd/ebx: int, offset/ecx: int, whence/edx: int</span>
<span id="L48" class="LineNr">48 </span> b8/copy-to-eax 0x13/imm32
<span id="L49" class="LineNr">49 </span> cd/syscall 0x80/imm8
<span id="L50" class="LineNr">50 </span> c3/return
<span id="L51" class="LineNr">51 </span>
<span id="L52" class="LineNr">52 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/creat.2.html">http://man7.org/linux/man-pages/man2/creat.2.html</a></span>
<span id="L53" class="LineNr">53 </span><span class="subxFunction">syscall_creat</span>: <span class="subxComment"># filename/ebx: (addr kernel-string) -> fd-or-error/eax: int</span>
<span id="L54" class="LineNr">54 </span> b8/copy-to-eax 8/imm32
<span id="L55" class="LineNr">55 </span> cd/syscall 0x80/imm8
<span id="L56" class="LineNr">56 </span> c3/return
<span id="L57" class="LineNr">57 </span>
<span id="L58" class="LineNr">58 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/unlink.2.html">http://man7.org/linux/man-pages/man2/unlink.2.html</a></span>
<span id="L59" class="LineNr">59 </span><span class="subxFunction">syscall_unlink</span>: <span class="subxComment"># filename/ebx: (addr kernel-string) -> status/eax: int</span>
<span id="L60" class="LineNr">60 </span> b8/copy-to-eax 0xa/imm32
<span id="L61" class="LineNr">61 </span> cd/syscall 0x80/imm8
<span id="L62" class="LineNr">62 </span> c3/return
<span id="L63" class="LineNr">63 </span>
<span id="L64" class="LineNr">64 </span><span class="subxComment"># <a href="http://man7.org/linux/man-pages/man2/rename.2.html">http://man7.org/linux/man-pages/man2/rename.2.html</a></span>
<span id="L65" class="LineNr">65 </span><span class="subxFunction">syscall_rename</span>: <span class="subxComment"># source/ebx: (addr kernel-string), dest/ecx: (addr kernel-string) -> status/eax: int</span>
<span id="L66" class="LineNr">66 </span> b8/copy-to-eax 0x26/imm32
<span id="L67" class="LineNr">67 </span> cd/syscall 0x80/imm8
<span id="L68" class="LineNr">68 </span> c3/return
<span id="L69" class="LineNr">69 </span>
<span id="L70" class="LineNr">70 </span><span class="subxComment"># <a href="https://github.com/torvalds/linux/blob/fa121bb3fed6313b1f0af23952301e06cf6d32ed/mm/nommu.c#L1352">https://github.com/torvalds/linux/blob/fa121bb3fed6313b1f0af23952301e06cf6d32ed/mm/nommu.c#L1352</a></span>
<span id="L71" class="LineNr">71 </span><span class="subxFunction">syscall_mmap</span>: <span class="subxComment"># arg/ebx: (addr mmap_arg_struct) -> status/eax: int</span>
<span id="L72" class="LineNr">72 </span> <span class="subxComment"># the important thing: ebx+4 contains the 32-bit size to be allocated</span>
<span id="L73" class="LineNr">73 </span> b8/copy-to-eax 0x5a/imm32
<span id="L74" class="LineNr">74 </span> cd/syscall 0x80/imm8
<span id="L75" class="LineNr">75 </span> c3/return
<span id="L76" class="LineNr">76 </span>
<span id="L77" class="LineNr">77 </span><span class="subxFunction">syscall_ioctl</span>: <span class="subxComment"># fd/ebx: int, cmd/ecx: int, arg/edx: (addr _)</span>
<span id="L78" class="LineNr">78 </span> b8/copy-to-eax 0x36/imm32
<span id="L79" class="LineNr">79 </span> cd/syscall 0x80/imm8
<span id="L80" class="LineNr">80 </span> c3/return
<span id="L81" class="LineNr">81 </span>
<span id="L82" class="LineNr">82 </span><span class="subxFunction">syscall_nanosleep</span>: <span class="subxComment"># req/ebx: (addr timespec)</span>
<span id="L83" class="LineNr">83 </span> b8/copy-to-eax 0xa2/imm32 <span class="subxComment"># 162</span>
<span id="L84" class="LineNr">84 </span> cd/syscall 0x80/imm8
<span id="L85" class="LineNr">85 </span> c3/return
<span id="L86" class="LineNr">86 </span>
<span id="L87" class="LineNr">87 </span><span class="subxFunction">syscall_clock_gettime</span>: <span class="subxComment"># clock/ebx: int, out/ecx: (addr timespec)</span>
<span id="L88" class="LineNr">88 </span> b8/copy-to-eax 0x109/imm32 <span class="subxComment"># 265</span>
<span id="L89" class="LineNr">89 </span> cd/syscall 0x80/imm8
<span id="L90" class="LineNr">90 </span> c3/return
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|