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
|
<!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/020elf.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; }
.PreProc { color: #800080; }
.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; }
.Todo { color: #000000; background-color: #ffff00; padding-bottom: 1px; }
.cSpecial { color: #008000; }
-->
</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">// <a href="https://github.com/kragen/stoneknifeforth/blob/702d2ebe1b/386.c">https://github.com/kragen/stoneknifeforth/blob/702d2ebe1b/386.c</a></span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(before "End Main")</span>
<span id="L4" class="LineNr"> 4 </span>assert<span class="Delimiter">(</span>argc > <span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L5" class="LineNr"> 5 </span><a href='000organization.cc.html#L139'>reset</a><span class="Delimiter">();</span>
<span id="L6" class="LineNr"> 6 </span><a href='020elf.cc.html#L11'>load_elf</a><span class="Delimiter">(</span>argv[<span class="Constant">1</span>]<span class="Delimiter">);</span>
<span id="L7" class="LineNr"> 7 </span><span class="Normal">while</span> <span class="Delimiter">(</span><a href='010core.cc.html#L23'>EIP</a> < <a href='010core.cc.html#L68'>End_of_program</a><span class="Delimiter">)</span>
<span id="L8" class="LineNr"> 8 </span> <a href='010core.cc.html#L109'>run_one_instruction</a><span class="Delimiter">();</span>
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr">10 </span><span class="Delimiter">:(code)</span>
<span id="L11" class="LineNr">11 </span><span class="Normal">void</span> <a href='020elf.cc.html#L11'>load_elf</a><span class="Delimiter">(</span><span class="Normal">const</span> string& filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L12" class="LineNr">12 </span> <span class="Normal">int</span> fd = open<span class="Delimiter">(</span>filename<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> O_RDONLY<span class="Delimiter">);</span>
<span id="L13" class="LineNr">13 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>fd < <span class="Constant">0</span><span class="Delimiter">)</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"</span><span class="cSpecial">%s</span><span class="Constant">: open"</span><span class="Delimiter">,</span> filename<span class="Delimiter">.</span>c_str<span class="Delimiter">());</span>
<span id="L14" class="LineNr">14 </span> <span class="Normal">off_t</span> size = lseek<span class="Delimiter">(</span>fd<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">SEEK_END</span><span class="Delimiter">);</span>
<span id="L15" class="LineNr">15 </span> lseek<span class="Delimiter">(</span>fd<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">SEEK_SET</span><span class="Delimiter">);</span>
<span id="L16" class="LineNr">16 </span> <span class="Normal">uint8_t</span>* elf_contents = <span class="Normal">static_cast</span><<span class="Normal">uint8_t</span>*><span class="Delimiter">(</span>malloc<span class="Delimiter">(</span>size<span class="Delimiter">));</span>
<span id="L17" class="LineNr">17 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>elf_contents == <span class="Constant">NULL</span><span class="Delimiter">)</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"malloc(</span><span class="cSpecial">%d</span><span class="Constant">)"</span><span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L18" class="LineNr">18 </span> <span class="Normal">ssize_t</span> read_size = read<span class="Delimiter">(</span>fd<span class="Delimiter">,</span> elf_contents<span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L19" class="LineNr">19 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>size != read_size<span class="Delimiter">)</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"read → </span><span class="cSpecial">%d</span><span class="Constant"> (!= </span><span class="cSpecial">%d</span><span class="Constant">)"</span><span class="Delimiter">,</span> size<span class="Delimiter">,</span> read_size<span class="Delimiter">);</span>
<span id="L20" class="LineNr">20 </span> <a href='020elf.cc.html#L24'>load_elf_contents</a><span class="Delimiter">(</span>elf_contents<span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L21" class="LineNr">21 </span> free<span class="Delimiter">(</span>elf_contents<span class="Delimiter">);</span>
<span id="L22" class="LineNr">22 </span><span class="Delimiter">}</span>
<span id="L23" class="LineNr">23 </span>
<span id="L24" class="LineNr">24 </span><span class="Normal">void</span> <a href='020elf.cc.html#L24'>load_elf_contents</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span>* elf_contents<span class="Delimiter">,</span> <span class="Normal">size_t</span> length<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L25" class="LineNr">25 </span> <span class="Normal">uint8_t</span> magic[<span class="Constant">5</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
<span id="L26" class="LineNr">26 </span> memcpy<span class="Delimiter">(</span>magic<span class="Delimiter">,</span> elf_contents<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L27" class="LineNr">27 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Constant">0</span> != memcmp<span class="Delimiter">(</span>magic<span class="Delimiter">,</span> <span class="Constant">"</span><span class="cSpecial">\177</span><span class="Constant">ELF"</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">))</span>
<span id="L28" class="LineNr">28 </span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"Invalid ELF file starting with </span><span class="cSpecial">\"</span><span class="cSpecial">%s</span><span class="cSpecial">\"</span><span class="Constant">"</span><span class="Delimiter">,</span> magic<span class="Delimiter">);</span>
<span id="L29" class="LineNr">29 </span>
<span id="L30" class="LineNr">30 </span> <span class="Normal">uint32_t</span> e_type = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[<span class="Constant">16</span>]<span class="Delimiter">);</span>
<span id="L31" class="LineNr">31 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Constant">0x00030002</span> != e_type<span class="Delimiter">)</span>
<span id="L32" class="LineNr">32 </span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"ELF type/machine 0x</span><span class="cSpecial">%x</span><span class="Constant"> isn't i386 executable"</span><span class="Delimiter">,</span> e_type<span class="Delimiter">);</span>
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span> <span class="Normal">uint32_t</span> e_entry = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[<span class="Constant">24</span>]<span class="Delimiter">);</span>
<span id="L35" class="LineNr">35 </span> <span class="Normal">uint32_t</span> e_phoff = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[<span class="Constant">28</span>]<span class="Delimiter">);</span>
<span id="L36" class="LineNr">36 </span> <span class="Normal">uint32_t</span> p_vaddr = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[e_phoff + <span class="Constant">8</span>]<span class="Delimiter">);</span>
<span id="L37" class="LineNr">37 </span> <span class="Normal">uint32_t</span> p_memsz = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[e_phoff + <span class="Constant">20</span>]<span class="Delimiter">);</span>
<span id="L38" class="LineNr">38 </span>
<span id="L39" class="LineNr">39 </span> <a href='010core.cc.html#L67'>Mem</a><span class="Delimiter">.</span>resize<span class="Delimiter">(</span>p_memsz<span class="Delimiter">);</span> <span class="Comment">// </span><span class="Todo">TODO</span><span class="Comment">: not sure if this should be + p_vaddr</span>
<span id="L40" class="LineNr">40 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>length > p_memsz - p_vaddr<span class="Delimiter">)</span> length = p_memsz - p_vaddr<span class="Delimiter">;</span>
<span id="L41" class="LineNr">41 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">size_t</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < length<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
<span id="L42" class="LineNr">42 </span> <a href='010core.cc.html#L67'>Mem</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>p_vaddr + i<span class="Delimiter">)</span> = elf_contents[i]<span class="Delimiter">;</span>
<span id="L43" class="LineNr">43 </span> <a href='010core.cc.html#L68'>End_of_program</a> = p_memsz<span class="Delimiter">;</span>
<span id="L44" class="LineNr">44 </span>
<span id="L45" class="LineNr">45 </span> <span class="Comment">// </span><span class="Todo">TODO</span><span class="Comment">: need to set up real stack somewhere</span>
<span id="L46" class="LineNr">46 </span>
<span id="L47" class="LineNr">47 </span> Reg[ESP]<span class="Delimiter">.</span>u = Reg[EBP]<span class="Delimiter">.</span>u = <a href='010core.cc.html#L68'>End_of_program</a><span class="Delimiter">;</span>
<span id="L48" class="LineNr">48 </span> <a href='010core.cc.html#L23'>EIP</a> = e_entry<span class="Delimiter">;</span>
<span id="L49" class="LineNr">49 </span><span class="Delimiter">}</span>
<span id="L50" class="LineNr">50 </span>
<span id="L51" class="LineNr">51 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span> <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span>* p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L52" class="LineNr">52 </span> <span class="Identifier">return</span> p[<span class="Constant">0</span>] | p[<span class="Constant">1</span>] << <span class="Constant">8</span> | p[<span class="Constant">2</span>] << <span class="Constant">16</span> | p[<span class="Constant">3</span>] << <span class="Constant">24</span><span class="Delimiter">;</span>
<span id="L53" class="LineNr">53 </span><span class="Delimiter">}</span>
<span id="L54" class="LineNr">54 </span>
<span id="L55" class="LineNr">55 </span><span class="Normal">void</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Normal">const</span> <span class="Normal">char</span>* format<span class="Delimiter">,</span> <span class="Delimiter">...)</span> <span class="Delimiter">{</span>
<span id="L56" class="LineNr">56 </span> <span class="Normal">va_list</span> args<span class="Delimiter">;</span>
<span id="L57" class="LineNr">57 </span> va_start<span class="Delimiter">(</span>args<span class="Delimiter">,</span> format<span class="Delimiter">);</span>
<span id="L58" class="LineNr">58 </span> vfprintf<span class="Delimiter">(</span><span class="Constant">stderr</span><span class="Delimiter">,</span> format<span class="Delimiter">,</span> args<span class="Delimiter">);</span>
<span id="L59" class="LineNr">59 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>errno<span class="Delimiter">)</span>
<span id="L60" class="LineNr">60 </span> perror<span class="Delimiter">(</span><span class="Constant">"<200c>"</span><span class="Delimiter">);</span>
<span id="L61" class="LineNr">61 </span> <span class="Normal">else</span>
<span id="L62" class="LineNr">62 </span> fprintf<span class="Delimiter">(</span><span class="Constant">stderr</span><span class="Delimiter">,</span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">);</span>
<span id="L63" class="LineNr">63 </span> va_end<span class="Delimiter">(</span>args<span class="Delimiter">);</span>
<span id="L64" class="LineNr">64 </span> abort<span class="Delimiter">();</span>
<span id="L65" class="LineNr">65 </span><span class="Delimiter">}</span>
<span id="L66" class="LineNr">66 </span>
<span id="L67" class="LineNr">67 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L68" class="LineNr">68 </span><span class="PreProc">#include </span><span class="Constant"><sys/types.h></span>
<span id="L69" class="LineNr">69 </span><span class="PreProc">#include </span><span class="Constant"><sys/stat.h></span>
<span id="L70" class="LineNr">70 </span><span class="PreProc">#include </span><span class="Constant"><fcntl.h></span>
<span id="L71" class="LineNr">71 </span><span class="PreProc">#include </span><span class="Constant"><unistd.h></span>
<span id="L72" class="LineNr">72 </span><span class="PreProc">#include </span><span class="Constant"><stdarg.h></span>
<span id="L73" class="LineNr">73 </span><span class="PreProc">#include </span><span class="Constant"><errno.h></span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|