about summary refs log tree commit diff stats
path: root/html/linux/102test.subx.html
blob: 238c1a47ce8b10b4b0ca62724ecd1ac21af6182d (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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
<!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 - linux/102test.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,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: #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; }
.subxS2Comment { color: #8a8a8a; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.SpecialChar { color: #d70000; }
.Constant { color: #008787; }
.Normal { color: #000000; background-color: #ffffd7; 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;
  }
  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/102test.subx'>https://github.com/akkartik/mu/blob/main/linux/102test.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Rudimentary test harness</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="SpecialChar">Entry</span>:  <span class="subxComment"># manual test</span>
<span id="L9" class="LineNr">  9 </span>    <span class="subxComment"># check-ints-equal(34, 34)</span>
<span id="L10" class="LineNr"> 10 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L11" class="LineNr"> 11 </span>    68/push  <span class="Constant">&quot;error in check-ints-equal&quot;</span>/imm32
<span id="L12" class="LineNr"> 12 </span>    68/push  34/imm32
<span id="L13" class="LineNr"> 13 </span>    68/push  34/imm32
<span id="L14" class="LineNr"> 14 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L15" class="LineNr"> 15 </span>    e8/call  <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32
<span id="L16" class="LineNr"> 16 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L17" class="LineNr"> 17 </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>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L18" class="LineNr"> 18 </span>    <span class="subxComment"># syscall(exit, 0)</span>
<span id="L19" class="LineNr"> 19 </span>    bb/copy-to-ebx  0/imm32
<span id="L20" class="LineNr"> 20 </span>    e8/call  <a href='000init.subx.html#L18'>syscall_exit</a>/disp32
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># print msg to stderr if a != b, otherwise print &quot;.&quot;</span>
<span id="L23" class="LineNr"> 23 </span><span class="subxFunction">check-ints-equal</span>:  <span class="subxComment"># a: int, b: int, msg: (addr array byte)</span>
<span id="L24" class="LineNr"> 24 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L25" class="LineNr"> 25 </span>    55/push-ebp
<span id="L26" class="LineNr"> 26 </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="L27" class="LineNr"> 27 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L28" class="LineNr"> 28 </span>    50/push-eax
<span id="L29" class="LineNr"> 29 </span>    51/push-ecx
<span id="L30" class="LineNr"> 30 </span>    53/push-ebx
<span id="L31" class="LineNr"> 31 </span>    <span class="subxComment"># load first 2 args into eax and ebx</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>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/ebx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to ebx</span>
<span id="L34" class="LineNr"> 34 </span>    <span class="subxComment"># if (eax == ebx) success</span>
<span id="L35" class="LineNr"> 35 </span>    39/compare                      3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/ebx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare eax and ebx</span>
<span id="L36" class="LineNr"> 36 </span>    75/jump-if-unequal  $check-ints-equal:else/disp8
<span id="L37" class="LineNr"> 37 </span>    <span class="subxS1Comment"># . _write(2/stderr, '.')</span>
<span id="L38" class="LineNr"> 38 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L39" class="LineNr"> 39 </span>    68/push  <span class="Constant">&quot;.&quot;</span>/imm32
<span id="L40" class="LineNr"> 40 </span>    68/push  2/imm32/stderr
<span id="L41" class="LineNr"> 41 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L42" class="LineNr"> 42 </span>    e8/call  <a href='101_write.subx.html#L12'>_write</a>/disp32
<span id="L43" class="LineNr"> 43 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L44" class="LineNr"> 44 </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>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L45" class="LineNr"> 45 </span>    <span class="subxS1Comment"># . return</span>
<span id="L46" class="LineNr"> 46 </span>    eb/jump  $check-ints-equal:end/disp8
<span id="L47" class="LineNr"> 47 </span>    <span class="subxComment"># otherwise print error message</span>
<span id="L48" class="LineNr"> 48 </span><span class="Constant">$check-ints-equal:else</span>:
<span id="L49" class="LineNr"> 49 </span>    <span class="subxS1Comment"># . _write(2/stderr, msg)</span>
<span id="L50" class="LineNr"> 50 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L51" class="LineNr"> 51 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+16) to ecx</span>
<span id="L52" class="LineNr"> 52 </span>    51/push-ecx
<span id="L53" class="LineNr"> 53 </span>    68/push  2/imm32/stderr
<span id="L54" class="LineNr"> 54 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L55" class="LineNr"> 55 </span>    e8/call  <a href='101_write.subx.html#L12'>_write</a>/disp32
<span id="L56" class="LineNr"> 56 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L57" class="LineNr"> 57 </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>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L58" class="LineNr"> 58 </span>    <span class="subxS1Comment"># . _write(2/stderr, Newline)</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L60" class="LineNr"> 60 </span>    68/push  <span class="SpecialChar"><a href='102test.subx.html#L82'>Newline</a></span>/imm32
<span id="L61" class="LineNr"> 61 </span>    68/push  2/imm32/stderr
<span id="L62" class="LineNr"> 62 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L63" class="LineNr"> 63 </span>    e8/call  <a href='101_write.subx.html#L12'>_write</a>/disp32
<span id="L64" class="LineNr"> 64 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L65" class="LineNr"> 65 </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>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L66" class="LineNr"> 66 </span>    <span class="subxComment"># increment Num-test-failures</span>
<span id="L67" class="LineNr"> 67 </span>    ff          0/subop/increment   0/mod/indirect  5/rm32/.disp32           <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          <span class="SpecialChar"><a href='102test.subx.html#L89'>Num-test-failures</a></span>/disp32          <span class="subxComment"># increment *Num-test-failures</span>
<span id="L68" class="LineNr"> 68 </span><span class="Constant">$check-ints-equal:end</span>:
<span id="L69" class="LineNr"> 69 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L70" class="LineNr"> 70 </span>    5b/pop-to-ebx
<span id="L71" class="LineNr"> 71 </span>    59/pop-to-ecx
<span id="L72" class="LineNr"> 72 </span>    58/pop-to-eax
<span id="L73" class="LineNr"> 73 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L74" class="LineNr"> 74 </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="L75" class="LineNr"> 75 </span>    5d/pop-to-ebp
<span id="L76" class="LineNr"> 76 </span>    c3/return
<span id="L77" class="LineNr"> 77 </span>
<span id="L78" class="LineNr"> 78 </span>== data
<span id="L79" class="LineNr"> 79 </span>
<span id="L80" class="LineNr"> 80 </span><span class="subxComment"># length-prefixed string containing just a single newline</span>
<span id="L81" class="LineNr"> 81 </span><span class="subxComment"># convenient to have when printing messages and so on</span>
<span id="L82" class="LineNr"> 82 </span><span class="SpecialChar">Newline</span>:  <span class="subxComment"># (array byte)</span>
<span id="L83" class="LineNr"> 83 </span>    <span class="subxComment"># size: int</span>
<span id="L84" class="LineNr"> 84 </span>    1/imm32
<span id="L85" class="LineNr"> 85 </span>    <span class="subxComment"># data</span>
<span id="L86" class="LineNr"> 86 </span>    0a/newline
<span id="L87" class="LineNr"> 87 </span>
<span id="L88" class="LineNr"> 88 </span><span class="subxComment"># every test failure increments this counter</span>
<span id="L89" class="LineNr"> 89 </span><span class="SpecialChar">Num-test-failures</span>:  <span class="subxComment"># int</span>
<span id="L90" class="LineNr"> 90 </span>    0/imm32
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="subxComment"># length-prefixed string containing just a single space</span>
<span id="L93" class="LineNr"> 93 </span><span class="SpecialChar">Space</span>:  <span class="subxComment"># (array byte)</span>
<span id="L94" class="LineNr"> 94 </span>    <span class="subxComment"># size: int</span>
<span id="L95" class="LineNr"> 95 </span>    1/imm32
<span id="L96" class="LineNr"> 96 </span>    <span class="subxComment"># data</span>
<span id="L97" class="LineNr"> 97 </span>    20/space
<span id="L98" class="LineNr"> 98 </span>
<span id="L99" class="LineNr"> 99 </span><span class="subxComment"># length-prefixed string containing just a single slash</span>
<span id="L100" class="LineNr">100 </span><span class="SpecialChar">Slash</span>:  <span class="subxComment"># (array byte)</span>
<span id="L101" class="LineNr">101 </span>    <span class="subxComment"># size: int</span>
<span id="L102" class="LineNr">102 </span>    1/imm32
<span id="L103" class="LineNr">103 </span>    <span class="subxComment"># data</span>
<span id="L104" class="LineNr">104 </span>    2f/slash
<span id="L105" class="LineNr">105 </span>
<span id="L106" class="LineNr">106 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->