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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
<!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 - 315stack-debug.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: #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 { }
.SpecialChar { color: #d70000; }
.subxS1Comment { color: #0000af; }
.CommentedCode { color: #8a8a8a; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.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/main/315stack-debug.subx'>https://github.com/akkartik/mu/blob/main/315stack-debug.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># The stack shouldn't grow into the code area.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span>== code
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="subxFunction">check-stack</span>:
<span id="L6" class="LineNr"> 6 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L7" class="LineNr"> 7 </span> 55/push-ebp
<span id="L8" class="LineNr"> 8 </span> 89/<- %ebp 4/r32/esp
<span id="L9" class="LineNr"> 9 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L10" class="LineNr"> 10 </span> 50/push-eax
<span id="L11" class="LineNr"> 11 </span> <span class="subxComment">#</span>
<span id="L12" class="LineNr"> 12 </span> 89/<- %eax 4/r32/esp
<span id="L13" class="LineNr"> 13 </span> 3d/compare-eax-and 0x01000000/imm32
<span id="L14" class="LineNr"> 14 </span> {
<span id="L15" class="LineNr"> 15 </span> 7f/jump-if-> <span class="Constant">break</span>/disp8
<span id="L16" class="LineNr"> 16 </span> (<a href='317abort.subx.html#L5'>abort</a> <span class="Constant">"stack overflow"</span>)
<span id="L17" class="LineNr"> 17 </span> }
<span id="L18" class="LineNr"> 18 </span><span class="Constant">$check-stack:end</span>:
<span id="L19" class="LineNr"> 19 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L20" class="LineNr"> 20 </span> 58/pop-to-eax
<span id="L21" class="LineNr"> 21 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L22" class="LineNr"> 22 </span> 89/<- %esp 5/r32/ebp
<span id="L23" class="LineNr"> 23 </span> 5d/pop-to-ebp
<span id="L24" class="LineNr"> 24 </span> c3/return
<span id="L25" class="LineNr"> 25 </span>
<span id="L26" class="LineNr"> 26 </span><span class="subxFunction">show-stack-state</span>:
<span id="L27" class="LineNr"> 27 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L28" class="LineNr"> 28 </span> 55/push-ebp
<span id="L29" class="LineNr"> 29 </span> 89/<- %ebp 4/r32/esp
<span id="L30" class="LineNr"> 30 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L31" class="LineNr"> 31 </span> 50/push-eax
<span id="L32" class="LineNr"> 32 </span> 51/push-ecx
<span id="L33" class="LineNr"> 33 </span> 52/push-edx
<span id="L34" class="LineNr"> 34 </span> <span class="subxComment">#</span>
<span id="L35" class="LineNr"> 35 </span> 89/<- %edx 4/r32/esp
<span id="L36" class="LineNr"> 36 </span> <span class="subxComment"># save old cursor position</span>
<span id="L37" class="LineNr"> 37 </span> (<a href='500fake-screen.mu.html#L174'>cursor-position</a> 0) <span class="subxComment"># => eax, ecx</span>
<span id="L38" class="LineNr"> 38 </span> <span class="subxComment"># print at top-right</span>
<span id="L39" class="LineNr"> 39 </span> (<a href='500fake-screen.mu.html#L190'>set-cursor-position</a> 0 0x70 0)
<span id="L40" class="LineNr"> 40 </span> (<a href='501draw-text.mu.html#L333'>draw-int32-hex-wrapping-right-then-down-from-cursor-over-full-screen</a> 0 %edx 0xf 0xc)
<span id="L41" class="LineNr"> 41 </span> <span class="subxComment"># restore cursor position</span>
<span id="L42" class="LineNr"> 42 </span> (<a href='500fake-screen.mu.html#L190'>set-cursor-position</a> %eax %ecx)
<span id="L43" class="LineNr"> 43 </span><span class="Constant">$show-stack-state:end</span>:
<span id="L44" class="LineNr"> 44 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L45" class="LineNr"> 45 </span> 5a/pop-to-edx
<span id="L46" class="LineNr"> 46 </span> 59/pop-to-ecx
<span id="L47" class="LineNr"> 47 </span> 58/pop-to-eax
<span id="L48" class="LineNr"> 48 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L49" class="LineNr"> 49 </span> 89/<- %esp 5/r32/ebp
<span id="L50" class="LineNr"> 50 </span> 5d/pop-to-ebp
<span id="L51" class="LineNr"> 51 </span> c3/return
<span id="L52" class="LineNr"> 52 </span>
<span id="L53" class="LineNr"> 53 </span><span class="subxComment"># Helper for debugging deeply recursive calls without logs or traces.</span>
<span id="L54" class="LineNr"> 54 </span><span class="subxComment"># Turn it on, insert calls in the right places, and you get a terse sense of</span>
<span id="L55" class="LineNr"> 55 </span><span class="subxComment"># important parts of the call stack. A poor sophont's stack trace.</span>
<span id="L56" class="LineNr"> 56 </span><span class="subxFunction">debug-print</span>: <span class="subxComment"># x: (addr array byte), fg: int, bg: int # x is very short; usually a single character</span>
<span id="L57" class="LineNr"> 57 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L58" class="LineNr"> 58 </span> 55/push-ebp
<span id="L59" class="LineNr"> 59 </span> 89/<- %ebp 4/r32/esp
<span id="L60" class="LineNr"> 60 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L61" class="LineNr"> 61 </span> 50/push-eax
<span id="L62" class="LineNr"> 62 </span> 51/push-ecx
<span id="L63" class="LineNr"> 63 </span> <span class="subxComment">#</span>
<span id="L64" class="LineNr"> 64 </span> {
<span id="L65" class="LineNr"> 65 </span> 81 7/subop/compare *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 0/imm32/false
<span id="L66" class="LineNr"> 66 </span> 74/jump-if-= <span class="Constant">break</span>/disp8
<span id="L67" class="LineNr"> 67 </span> (<a href='501draw-text.mu.html#L279'>draw-text-wrapping-right-then-down-from-cursor-over-full-screen</a> 0 *(ebp+8) *(ebp+0xc) *(ebp+0x10))
<span id="L68" class="LineNr"> 68 </span> <span class="subxComment"># clear the screen and continue if we got too close to the bottom</span>
<span id="L69" class="LineNr"> 69 </span> (<a href='500fake-screen.mu.html#L174'>cursor-position</a> 0) <span class="subxComment"># => eax, ecx</span>
<span id="L70" class="LineNr"> 70 </span> 81 7/subop/compare %ecx 0x28/imm32
<span id="L71" class="LineNr"> 71 </span> 75/jump-if-!= <span class="Constant">break</span>/disp8
<span id="L72" class="LineNr"> 72 </span> (<a href='500fake-screen.mu.html#L251'>clear-screen</a> 0)
<span id="L73" class="LineNr"> 73 </span> (<a href='500fake-screen.mu.html#L190'>set-cursor-position</a> 0 0 0)
<span id="L74" class="LineNr"> 74 </span> }
<span id="L75" class="LineNr"> 75 </span><span class="Constant">$debug-print:end</span>:
<span id="L76" class="LineNr"> 76 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L77" class="LineNr"> 77 </span> 59/pop-to-ecx
<span id="L78" class="LineNr"> 78 </span> 58/pop-to-eax
<span id="L79" class="LineNr"> 79 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L80" class="LineNr"> 80 </span> 89/<- %esp 5/r32/ebp
<span id="L81" class="LineNr"> 81 </span> 5d/pop-to-ebp
<span id="L82" class="LineNr"> 82 </span> c3/return
<span id="L83" class="LineNr"> 83 </span>
<span id="L84" class="LineNr"> 84 </span><span class="subxFunction">debug-print?</span>: <span class="subxComment"># -> _/eax: boolean</span>
<span id="L85" class="LineNr"> 85 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L86" class="LineNr"> 86 </span> 55/push-ebp
<span id="L87" class="LineNr"> 87 </span> 89/<- %ebp 4/r32/esp
<span id="L88" class="LineNr"> 88 </span> <span class="subxComment">#</span>
<span id="L89" class="LineNr"> 89 </span> 8b/-> *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 0/r32/eax
<span id="L90" class="LineNr"> 90 </span><span class="Constant">$debug-print?:end</span>:
<span id="L91" class="LineNr"> 91 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L92" class="LineNr"> 92 </span> 89/<- %esp 5/r32/ebp
<span id="L93" class="LineNr"> 93 </span> 5d/pop-to-ebp
<span id="L94" class="LineNr"> 94 </span> c3/return
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="subxFunction">turn-on-debug-print</span>:
<span id="L97" class="LineNr"> 97 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L98" class="LineNr"> 98 </span> 55/push-ebp
<span id="L99" class="LineNr"> 99 </span> 89/<- %ebp 4/r32/esp
<span id="L100" class="LineNr">100 </span> <span class="subxComment">#</span>
<span id="L101" class="LineNr">101 </span> c7 0/subop/copy *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 1/imm32/true
<span id="L102" class="LineNr">102 </span><span class="Constant">$turn-on-debug-print:end</span>:
<span id="L103" class="LineNr">103 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L104" class="LineNr">104 </span> 89/<- %esp 5/r32/ebp
<span id="L105" class="LineNr">105 </span> 5d/pop-to-ebp
<span id="L106" class="LineNr">106 </span> c3/return
<span id="L107" class="LineNr">107 </span>
<span id="L108" class="LineNr">108 </span><span class="subxFunction">turn-off-debug-print</span>:
<span id="L109" class="LineNr">109 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L110" class="LineNr">110 </span> 55/push-ebp
<span id="L111" class="LineNr">111 </span> 89/<- %ebp 4/r32/esp
<span id="L112" class="LineNr">112 </span> <span class="subxComment">#</span>
<span id="L113" class="LineNr">113 </span> c7 0/subop/copy *<span class="SpecialChar"><a href='315stack-debug.subx.html#L121'>Really-debug-print</a></span> 0/imm32/false
<span id="L114" class="LineNr">114 </span><span class="Constant">$turn-off-debug-print:end</span>:
<span id="L115" class="LineNr">115 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L116" class="LineNr">116 </span> 89/<- %esp 5/r32/ebp
<span id="L117" class="LineNr">117 </span> 5d/pop-to-ebp
<span id="L118" class="LineNr">118 </span> c3/return
<span id="L119" class="LineNr">119 </span>
<span id="L120" class="LineNr">120 </span>== data
<span id="L121" class="LineNr">121 </span><span class="SpecialChar">Really-debug-print</span>:
<span id="L122" class="LineNr">122 </span> 0/imm32/false
<span id="L123" class="LineNr">123 </span><span class="CommentedCode">#? 1/imm32/true</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|