html/092stack.subx.html



b1635a5c ^


8fa32599 ^
b1635a5c ^


9a777801 ^

b1635a5c ^
b1635a5c ^
9a777801 ^
b1635a5c ^

b1635a5c ^


8fa32599 ^
b1635a5c ^


9a777801 ^


b1635a5c ^


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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483


<!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 - 092stack.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: #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; }
.subxS2Comment { color: #8a8a8a; }
.subxTest { color: #5f8700; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.LineNr { }
.subxS1Comment { color: #0000af; }
.SpecialChar { color: #d70000; }
.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
.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/092stack.subx'>https://github.com/akkartik/mu/blob/master/092stack.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="subxComment"># A stack looks like this:</span>
<span id="L2" class="LineNr">  2 </span><span class="subxComment">#   top: int</span>
<span id="L3" class="LineNr">  3 </span><span class="subxComment">#   data: (array byte)  # prefixed by size as usual</span>
<span id="L4" class="LineNr">  4 </span><span class="subxComment">#</span>
<span id="L5" class="LineNr">  5 </span><span class="subxComment"># TODO: is it confusing that the push opcodes grow memory downward, but the</span>
<span id="L6" class="LineNr">  6 </span><span class="subxComment"># push function grows stacks upward?</span>
<span id="L7" class="LineNr">  7 </span>
<span id="L8" class="LineNr">  8 </span>== code
<span id="L9" class="LineNr">  9 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L10" class="LineNr"> 10 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L11" class="LineNr"> 11 </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="L12" class="LineNr"> 12 </span>
<span id="L13" class="LineNr"> 13 </span><span class="subxFunction">clear-stack</span>:  <span class="subxComment"># s: (addr stack)</span>
<span id="L14" class="LineNr"> 14 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L15" class="LineNr"> 15 </span>    55/push-ebp
<span id="L16" class="LineNr"> 16 </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="L17" class="LineNr"> 17 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L18" class="LineNr"> 18 </span>    50/push-eax
<span id="L19" class="LineNr"> 19 </span>    51/push-ecx
<span id="L20" class="LineNr"> 20 </span>    <span class="subxComment"># eax = s</span>
<span id="L21" class="LineNr"> 21 </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="L22" class="LineNr"> 22 </span>    <span class="subxComment"># var max/ecx: (addr byte) = &amp;s-&gt;data[s-&gt;size]</span>
<span id="L23" class="LineNr"> 23 </span>    8b/copy                         1/mod/*+disp8   0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(eax+4) to eax</span>
<span id="L24" class="LineNr"> 24 </span>    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx  <span class="Normal"> . </span>          1/r32/ecx   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy eax+ecx+8 to ecx</span>
<span id="L25" class="LineNr"> 25 </span>    <span class="subxComment"># s-&gt;top = 0</span>
<span id="L26" class="LineNr"> 26 </span>    c7          0/subop/copy        0/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0/imm32           <span class="subxComment"># copy to *eax</span>
<span id="L27" class="LineNr"> 27 </span>    <span class="subxComment"># var curr/eax: (addr byte) = s-&gt;data</span>
<span id="L28" class="LineNr"> 28 </span>    81          0/subop/add         3/mod/direct    0/rm32/eax   <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 eax</span>
<span id="L29" class="LineNr"> 29 </span><span class="Constant">$clear-stack:loop</span>:
<span id="L30" class="LineNr"> 30 </span>    <span class="subxComment"># if (curr &gt;= max) break</span>
<span id="L31" class="LineNr"> 31 </span>    39/compare                      3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare eax with ecx</span>
<span id="L32" class="LineNr"> 32 </span>    73/jump-if-addr&gt;=  $clear-stack:end/disp8
<span id="L33" class="LineNr"> 33 </span>    <span class="subxComment"># *curr = 0</span>
<span id="L34" class="LineNr"> 34 </span>    c6          0/subop/copy        0/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0/imm8            <span class="subxComment"># copy byte to *eax</span>
<span id="L35" class="LineNr"> 35 </span>    <span class="subxComment"># ++curr</span>
<span id="L36" class="LineNr"> 36 </span>    40/increment-eax
<span id="L37" class="LineNr"> 37 </span>    eb/jump $clear-stack:<span class="Constant">loop</span>/disp8
<span id="L38" class="LineNr"> 38 </span><span class="Constant">$clear-stack:end</span>:
<span id="L39" class="LineNr"> 39 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L40" class="LineNr"> 40 </span>    59/pop-to-ecx
<span id="L41" class="LineNr"> 41 </span>    58/pop-to-eax
<span id="L42" class="LineNr"> 42 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L43" class="LineNr"> 43 </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="L44" class="LineNr"> 44 </span>    5d/pop-to-ebp
<span id="L45" class="LineNr"> 45 </span>    c3/return
<span id="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span><span class="subxTest">test-clear-stack</span>:
<span id="L48" class="LineNr"> 48 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L49" class="LineNr"> 49 </span>    55/push-ebp
<span id="L50" class="LineNr"> 50 </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="L51" class="LineNr"> 51 </span>    <span class="subxComment"># var stack/ecx = stack of size 8 with random data in it</span>
<span id="L52" class="LineNr"> 52 </span>    68/push 34/imm32
<span id="L53" class="LineNr"> 53 </span>    68/push 35/imm32
<span id="L54" class="LineNr"> 54 </span>    68/push 8/imm32/size
<span id="L55" class="LineNr"> 55 </span>    68/push 14/imm32/top
<span id="L56" class="LineNr"> 56 </span>    89/copy                         3/mod/direct    1/rm32/ecx   <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 ecx</span>
<span id="L57" class="LineNr"> 57 </span>    <span class="subxComment"># clear(stack)</span>
<span id="L58" class="LineNr"> 58 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L59" class="LineNr"> 59 </span>    51/push-ecx
<span id="L60" class="LineNr"> 60 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L61" class="LineNr"> 61 </span>    e8/call  <a href='092stack.subx.html#L13'>clear-stack</a>/disp32
<span id="L62" class="LineNr"> 62 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L63" class="LineNr"> 63 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L64" class="LineNr"> 64 </span>    <span class="subxComment"># top should be 0</span>
<span id="L65" class="LineNr"> 65 </span>    58/pop-to-eax
<span id="L66" class="LineNr"> 66 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 0, msg)</span>
<span id="L67" class="LineNr"> 67 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L68" class="LineNr"> 68 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L47'>test-clear-stack</a>: top&quot;</span>/imm32
<span id="L69" class="LineNr"> 69 </span>    68/push  0/imm32
<span id="L70" class="LineNr"> 70 </span>    50/push-eax
<span id="L71" class="LineNr"> 71 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L72" class="LineNr"> 72 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L73" class="LineNr"> 73 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L74" class="LineNr"> 74 </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="L75" class="LineNr"> 75 </span>    <span class="subxComment"># size should remain 8</span>
<span id="L76" class="LineNr"> 76 </span>    58/pop-to-eax
<span id="L77" class="LineNr"> 77 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 8, msg)</span>
<span id="L78" class="LineNr"> 78 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L79" class="LineNr"> 79 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L47'>test-clear-stack</a>: size&quot;</span>/imm32
<span id="L80" class="LineNr"> 80 </span>    68/push  8/imm32
<span id="L81" class="LineNr"> 81 </span>    50/push-eax
<span id="L82" class="LineNr"> 82 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L83" class="LineNr"> 83 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L84" class="LineNr"> 84 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L85" class="LineNr"> 85 </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="L86" class="LineNr"> 86 </span>    <span class="subxComment"># first word is 0</span>
<span id="L87" class="LineNr"> 87 </span>    58/pop-to-eax
<span id="L88" class="LineNr"> 88 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 0, msg)</span>
<span id="L89" class="LineNr"> 89 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L90" class="LineNr"> 90 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L47'>test-clear-stack</a>: data[0..3]&quot;</span>/imm32
<span id="L91" class="LineNr"> 91 </span>    68/push  0/imm32
<span id="L92" class="LineNr"> 92 </span>    50/push-eax
<span id="L93" class="LineNr"> 93 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L94" class="LineNr"> 94 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L95" class="LineNr"> 95 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L96" class="LineNr"> 96 </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="L97" class="LineNr"> 97 </span>    <span class="subxComment"># second word is 0</span>
<span id="L98" class="LineNr"> 98 </span>    58/pop-to-eax
<span id="L99" class="LineNr"> 99 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 0, msg)</span>
<span id="L100" class="LineNr">100 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L101" class="LineNr">101 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L47'>test-clear-stack</a>: data[4..7]&quot;</span>/imm32
<span id="L102" class="LineNr">102 </span>    68/push  0/imm32
<span id="L103" class="LineNr">103 </span>    50/push-eax
<span id="L104" class="LineNr">104 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L105" class="LineNr">105 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L106" class="LineNr">106 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L107" class="LineNr">107 </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="L108" class="LineNr">108 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L109" class="LineNr">109 </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="L110" class="LineNr">110 </span>    5d/pop-to-ebp
<span id="L111" class="LineNr">111 </span>    c3/return
<span id="L112" class="LineNr">112 </span>
<span id="L113" class="LineNr">113 </span><span class="subxComment"># TODO: make this generic</span>
<span id="L114" class="LineNr">114 </span><span class="subxFunction">push</span>:  <span class="subxComment"># s: (addr stack), n: int</span>
<span id="L115" class="LineNr">115 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L116" class="LineNr">116 </span>    55/push-ebp
<span id="L117" class="LineNr">117 </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="L118" class="LineNr">118 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L119" class="LineNr">119 </span>    50/push-eax
<span id="L120" class="LineNr">120 </span>    51/push-ecx
<span id="L121" class="LineNr">121 </span>    56/push-esi
<span id="L122" class="LineNr">122 </span>    <span class="subxComment"># esi = s</span>
<span id="L123" class="LineNr">123 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L124" class="LineNr">124 </span>    <span class="subxComment"># ecx = s-&gt;top</span>
<span id="L125" class="LineNr">125 </span>    8b/copy                         0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *esi to ecx</span>
<span id="L126" class="LineNr">126 </span>    <span class="subxComment"># if (s-&gt;top &gt;= s-&gt;size) abort</span>
<span id="L127" class="LineNr">127 </span>    39/compare                      1/mod/*+disp8   6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># compare *(esi+4) and ecx</span>
<span id="L128" class="LineNr">128 </span>    7e/jump-if-&lt;=  $push:abort/disp8
<span id="L129" class="LineNr">129 </span>    <span class="subxComment"># s-&gt;data[s-&gt;top] = n</span>
<span id="L130" class="LineNr">130 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to eax</span>
<span id="L131" class="LineNr">131 </span>    89/copy                         1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx  <span class="Normal"> . </span>          0/r32/eax   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy eax to *(esi+ecx+8)</span>
<span id="L132" class="LineNr">132 </span>    <span class="subxComment"># s-&gt;top += 4</span>
<span id="L133" class="LineNr">133 </span>    81          0/subop/add         0/mod/direct    6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              4/imm32           <span class="subxComment"># subtract from *esi</span>
<span id="L134" class="LineNr">134 </span><span class="Constant">$push:end</span>:
<span id="L135" class="LineNr">135 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L136" class="LineNr">136 </span>    5e/pop-to-esi
<span id="L137" class="LineNr">137 </span>    59/pop-to-ecx
<span id="L138" class="LineNr">138 </span>    58/pop-to-eax
<span id="L139" class="LineNr">139 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L140" class="LineNr">140 </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="L141" class="LineNr">141 </span>    5d/pop-to-ebp
<span id="L142" class="LineNr">142 </span>    c3/return
<span id="L143" class="LineNr">143 </span>
<span id="L144" class="LineNr">144 </span><span class="Constant">$push:abort</span>:
<span id="L145" class="LineNr">145 </span>    <span class="subxComment"># print(stderr, &quot;error: push: no space left&quot;)</span>
<span id="L146" class="LineNr">146 </span>    <span class="subxS1Comment"># . write-buffered(Stderr, &quot;error: push: no space left&quot;)</span>
<span id="L147" class="LineNr">147 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L148" class="LineNr">148 </span>    68/push  <span class="Constant">&quot;error: <a href='092stack.subx.html#L114'>push</a>: no space left&quot;</span>/imm32
<span id="L149" class="LineNr">149 </span>    68/push  <span class="SpecialChar"><a href='065write-buffered.subx.html#L209'>Stderr</a></span>/imm32
<span id="L150" class="LineNr">150 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L151" class="LineNr">151 </span>    e8/call  <a href='065write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L152" class="LineNr">152 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L153" class="LineNr">153 </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="L154" class="LineNr">154 </span>    <span class="subxS1Comment"># . flush(Stderr)</span>
<span id="L155" class="LineNr">155 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L156" class="LineNr">156 </span>    68/push  <span class="SpecialChar"><a href='065write-buffered.subx.html#L209'>Stderr</a></span>/imm32
<span id="L157" class="LineNr">157 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L158" class="LineNr">158 </span>    e8/call  <a href='064write-byte.subx.html#L81'>flush</a>/disp32
<span id="L159" class="LineNr">159 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L160" class="LineNr">160 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L161" class="LineNr">161 </span>    <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L162" class="LineNr">162 </span>    bb/copy-to-ebx  1/imm32
<span id="L163" class="LineNr">163 </span>    b8/copy-to-eax  1/imm32/exit
<span id="L164" class="LineNr">164 </span>    cd/syscall  0x80/imm8
<span id="L165" class="LineNr">165 </span>    <span class="subxComment"># never gets here</span>
<span id="L166" class="LineNr">166 </span>
<span id="L167" class="LineNr">167 </span><span class="subxTest">test-push</span>:
<span id="L168" class="LineNr">168 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L169" class="LineNr">169 </span>    55/push-ebp
<span id="L170" class="LineNr">170 </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="L171" class="LineNr">171 </span>    <span class="subxComment"># var stack/ecx = empty stack of size 8</span>
<span id="L172" class="LineNr">172 </span>    68/push 0/imm32
<span id="L173" class="LineNr">173 </span>    68/push 0/imm32
<span id="L174" class="LineNr">174 </span>    68/push 8/imm32/size
<span id="L175" class="LineNr">175 </span>    68/push 0/imm32/top
<span id="L176" class="LineNr">176 </span>    89/copy                         3/mod/direct    1/rm32/ecx   <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 ecx</span>
<span id="L177" class="LineNr">177 </span>    <span class="subxComment"># push(stack, 0x42)</span>
<span id="L178" class="LineNr">178 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L179" class="LineNr">179 </span>    68/push  0x42/imm32
<span id="L180" class="LineNr">180 </span>    51/push-ecx
<span id="L181" class="LineNr">181 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L182" class="LineNr">182 </span>    e8/call  <a href='092stack.subx.html#L114'>push</a>/disp32
<span id="L183" class="LineNr">183 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L184" class="LineNr">184 </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="L185" class="LineNr">185 </span>    <span class="subxComment"># check top</span>
<span id="L186" class="LineNr">186 </span>    58/pop-to-eax
<span id="L187" class="LineNr">187 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 4, msg)</span>
<span id="L188" class="LineNr">188 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L189" class="LineNr">189 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L167'>test-push</a>: top&quot;</span>/imm32
<span id="L190" class="LineNr">190 </span>    68/push  4/imm32
<span id="L191" class="LineNr">191 </span>    50/push-eax
<span id="L192" class="LineNr">192 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L193" class="LineNr">193 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L194" class="LineNr">194 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L195" class="LineNr">195 </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="L196" class="LineNr">196 </span>    <span class="subxComment"># check size</span>
<span id="L197" class="LineNr">197 </span>    58/pop-to-eax
<span id="L198" class="LineNr">198 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 8, msg)</span>
<span id="L199" class="LineNr">199 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L200" class="LineNr">200 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L167'>test-push</a>: size&quot;</span>/imm32
<span id="L201" class="LineNr">201 </span>    68/push  8/imm32
<span id="L202" class="LineNr">202 </span>    50/push-eax
<span id="L203" class="LineNr">203 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L204" class="LineNr">204 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L205" class="LineNr">205 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L206" class="LineNr">206 </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="L207" class="LineNr">207 </span>    <span class="subxComment"># first word is 0x42</span>
<span id="L208" class="LineNr">208 </span>    58/pop-to-eax
<span id="L209" class="LineNr">209 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 0x42, msg)</span>
<span id="L210" class="LineNr">210 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L211" class="LineNr">211 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L167'>test-push</a>: data[0..3]&quot;</span>/imm32
<span id="L212" class="LineNr">212 </span>    68/push  0x42/imm32
<span id="L213" class="LineNr">213 </span>    50/push-eax
<span id="L214" class="LineNr">214 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L215" class="LineNr">215 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L216" class="LineNr">216 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L217" class="LineNr">217 </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="L218" class="LineNr">218 </span>    <span class="subxComment"># second word is 0</span>
<span id="L219" class="LineNr">219 </span>    58/pop-to-eax
<span id="L220" class="LineNr">220 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 0, msg)</span>
<span id="L221" class="LineNr">221 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L222" class="LineNr">222 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L167'>test-push</a>: data[4..7]&quot;</span>/imm32
<span id="L223" class="LineNr">223 </span>    68/push  0/imm32
<span id="L224" class="LineNr">224 </span>    50/push-eax
<span id="L225" class="LineNr">225 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L226" class="LineNr">226 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L227" class="LineNr">227 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L228" class="LineNr">228 </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="L229" class="LineNr">229 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L230" class="LineNr">230 </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="L231" class="LineNr">231 </span>    5d/pop-to-ebp
<span id="L232" class="LineNr">232 </span>    c3/return
<span id="L233" class="LineNr">233 </span>
<span id="L234" class="LineNr">234 </span><span class="subxComment"># TODO: make this generic</span>
<span id="L235" class="LineNr">235 </span><span class="subxFunction">pop</span>:  <span class="subxComment"># s: (addr stack) -&gt; n/eax: int</span>
<span id="L236" class="LineNr">236 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L237" class="LineNr">237 </span>    55/push-ebp
<span id="L238" class="LineNr">238 </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="L239" class="LineNr">239 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L240" class="LineNr">240 </span>    51/push-ecx
<span id="L241" class="LineNr">241 </span>    56/push-esi
<span id="L242" class="LineNr">242 </span>    <span class="subxComment"># esi = s</span>
<span id="L243" class="LineNr">243 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L244" class="LineNr">244 </span>    <span class="subxComment"># if (s-&gt;top &lt;= 0) abort</span>
<span id="L245" class="LineNr">245 </span>    81          7/subop/compare     0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0/imm32           <span class="subxComment"># compare *esi</span>
<span id="L246" class="LineNr">246 </span>    7e/jump-if-&lt;=  $pop:abort/disp8
<span id="L247" class="LineNr">247 </span>    <span class="subxComment"># s-&gt;top -= 4</span>
<span id="L248" class="LineNr">248 </span>    81          5/subop/subtract    0/mod/direct    6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              4/imm32           <span class="subxComment"># subtract from *esi</span>
<span id="L249" class="LineNr">249 </span>    <span class="subxComment"># eax = s-&gt;data[s-&gt;top]</span>
<span id="L250" class="LineNr">250 </span>    8b/copy                         0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *esi to ecx</span>
<span id="L251" class="LineNr">251 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx  <span class="Normal"> . </span>          0/r32/eax   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(esi+ecx+8) to eax</span>
<span id="L252" class="LineNr">252 </span>    <span class="subxComment"># s-&gt;data[s-&gt;top] = 0</span>
<span id="L253" class="LineNr">253 </span>    c7          0/subop/copy        1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx  <span class="Normal"> . </span>          0/r32/eax   8/disp8         0/imm32           <span class="subxComment"># copy to *(esi+ecx+8)</span>
<span id="L254" class="LineNr">254 </span><span class="Constant">$pop:end</span>:
<span id="L255" class="LineNr">255 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L256" class="LineNr">256 </span>    5e/pop-to-esi
<span id="L257" class="LineNr">257 </span>    59/pop-to-ecx
<span id="L258" class="LineNr">258 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L259" class="LineNr">259 </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="L260" class="LineNr">260 </span>    5d/pop-to-ebp
<span id="L261" class="LineNr">261 </span>    c3/return
<span id="L262" class="LineNr">262 </span>
<span id="L263" class="LineNr">263 </span><span class="Constant">$pop:abort</span>:
<span id="L264" class="LineNr">264 </span>    <span class="subxComment"># print(stderr, &quot;error: pop: nothing left in stack&quot;)</span>
<span id="L265" class="LineNr">265 </span>    <span class="subxS1Comment"># . write-buffered(Stderr, &quot;error: pop: nothing left in stack&quot;)</span>
<span id="L266" class="LineNr">266 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L267" class="LineNr">267 </span>    68/push  <span class="Constant">&quot;error: <a href='092stack.subx.html#L235'>pop</a>: nothing left in stack&quot;</span>/imm32
<span id="L268" class="LineNr">268 </span>    68/push  <span class="SpecialChar"><a href='065write-buffered.subx.html#L209'>Stderr</a></span>/imm32
<span id="L269" class="LineNr">269 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L270" class="LineNr">270 </span>    e8/call  <a href='065write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L271" class="LineNr">271 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L272" class="LineNr">272 </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="L273" class="LineNr">273 </span>    <span class="subxS1Comment"># . flush(Stderr)</span>
<span id="L274" class="LineNr">274 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L275" class="LineNr">275 </span>    68/push  <span class="SpecialChar"><a href='065write-buffered.subx.html#L209'>Stderr</a></span>/imm32
<span id="L276" class="LineNr">276 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L277" class="LineNr">277 </span>    e8/call  <a href='064write-byte.subx.html#L81'>flush</a>/disp32
<span id="L278" class="LineNr">278 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L279" class="LineNr">279 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L280" class="LineNr">280 </span>    <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L281" class="LineNr">281 </span>    bb/copy-to-ebx  1/imm32
<span id="L282" class="LineNr">282 </span>    b8/copy-to-eax  1/imm32/exit
<span id="L283" class="LineNr">283 </span>    cd/syscall  0x80/imm8
<span id="L284" class="LineNr">284 </span>    <span class="subxComment"># never gets here</span>
<span id="L285" class="LineNr">285 </span>
<span id="L286" class="LineNr">286 </span><span class="subxTest">test-pop</span>:
<span id="L287" class="LineNr">287 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L288" class="LineNr">288 </span>    55/push-ebp
<span id="L289" class="LineNr">289 </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="L290" class="LineNr">290 </span>    <span class="subxComment"># var stack/ecx = stack of size 8 containing just 0x42</span>
<span id="L291" class="LineNr">291 </span>    68/push 0/imm32
<span id="L292" class="LineNr">292 </span>    68/push 0x42/imm32
<span id="L293" class="LineNr">293 </span>    68/push 8/imm32/size
<span id="L294" class="LineNr">294 </span>    68/push 4/imm32/top
<span id="L295" class="LineNr">295 </span>    89/copy                         3/mod/direct    1/rm32/ecx   <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 ecx</span>
<span id="L296" class="LineNr">296 </span>    <span class="subxComment"># eax = pop(stack)</span>
<span id="L297" class="LineNr">297 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L298" class="LineNr">298 </span>    51/push-ecx
<span id="L299" class="LineNr">299 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L300" class="LineNr">300 </span>    e8/call  <a href='092stack.subx.html#L235'>pop</a>/disp32
<span id="L301" class="LineNr">301 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L302" class="LineNr">302 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L303" class="LineNr">303 </span>    <span class="subxComment"># check-ints-equal(eax, 0x42, msg)</span>
<span id="L304" class="LineNr">304 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L305" class="LineNr">305 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L286'>test-pop</a>: result&quot;</span>/imm32
<span id="L306" class="LineNr">306 </span>    68/push  0x42/imm32
<span id="L307" class="LineNr">307 </span>    50/push-eax
<span id="L308" class="LineNr">308 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L309" class="LineNr">309 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L310" class="LineNr">310 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L311" class="LineNr">311 </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="L312" class="LineNr">312 </span>    <span class="subxComment"># check top</span>
<span id="L313" class="LineNr">313 </span>    58/pop-to-eax
<span id="L314" class="LineNr">314 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 0, msg)</span>
<span id="L315" class="LineNr">315 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L316" class="LineNr">316 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L286'>test-pop</a>: top&quot;</span>/imm32
<span id="L317" class="LineNr">317 </span>    68/push  0/imm32
<span id="L318" class="LineNr">318 </span>    50/push-eax
<span id="L319" class="LineNr">319 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L320" class="LineNr">320 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L321" class="LineNr">321 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L322" class="LineNr">322 </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="L323" class="LineNr">323 </span>    <span class="subxComment"># check size</span>
<span id="L324" class="LineNr">324 </span>    58/pop-to-eax
<span id="L325" class="LineNr">325 </span>    <span class="subxS1Comment"># . check-ints-equal(eax, 8, msg)</span>
<span id="L326" class="LineNr">326 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L327" class="LineNr">327 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L286'>test-pop</a>: size&quot;</span>/imm32
<span id="L328" class="LineNr">328 </span>    68/push  8/imm32
<span id="L329" class="LineNr">329 </span>    50/push-eax
<span id="L330" class="LineNr">330 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L331" class="LineNr">331 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L332" class="LineNr">332 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L333" class="LineNr">333 </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="L334" class="LineNr">334 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L335" class="LineNr">335 </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="L336" class="LineNr">336 </span>    5d/pop-to-ebp
<span id="L337" class="LineNr">337 </span>    c3/return
<span id="L338" class="LineNr">338 </span>
<span id="L339" class="LineNr">339 </span><span class="subxComment"># TODO: make this generic</span>
<span id="L340" class="LineNr">340 </span><span class="subxFunction">top</span>:  <span class="subxComment"># s: (addr stack) -&gt; n/eax: int</span>
<span id="L341" class="LineNr">341 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L342" class="LineNr">342 </span>    55/push-ebp
<span id="L343" class="LineNr">343 </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="L344" class="LineNr">344 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L345" class="LineNr">345 </span>    51/push-ecx
<span id="L346" class="LineNr">346 </span>    56/push-esi
<span id="L347" class="LineNr">347 </span>    <span class="subxComment"># esi = s</span>
<span id="L348" class="LineNr">348 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          6/r32/esi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to esi</span>
<span id="L349" class="LineNr">349 </span>    <span class="subxComment"># if (s-&gt;top &lt;= 0) abort</span>
<span id="L350" class="LineNr">350 </span>    81          7/subop/compare     0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0/imm32           <span class="subxComment"># compare *esi</span>
<span id="L351" class="LineNr">351 </span>    7e/jump-if-&lt;=  $top:abort/disp8
<span id="L352" class="LineNr">352 </span>    <span class="subxComment"># n = s-&gt;data[s-&gt;top - 4]</span>
<span id="L353" class="LineNr">353 </span>    8b/copy                         0/mod/indirect  6/rm32/esi   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *esi to ecx</span>
<span id="L354" class="LineNr">354 </span>    81          5/subop/subtract    3/mod/direct    1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              4/imm32           <span class="subxComment"># subtract from ecx</span>
<span id="L355" class="LineNr">355 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    6/base/esi  1/index/ecx  <span class="Normal"> . </span>          0/r32/eax   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(esi+ecx+8) to eax</span>
<span id="L356" class="LineNr">356 </span><span class="Constant">$top:end</span>:
<span id="L357" class="LineNr">357 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L358" class="LineNr">358 </span>    5e/pop-to-esi
<span id="L359" class="LineNr">359 </span>    59/pop-to-ecx
<span id="L360" class="LineNr">360 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L361" class="LineNr">361 </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="L362" class="LineNr">362 </span>    5d/pop-to-ebp
<span id="L363" class="LineNr">363 </span>    c3/return
<span id="L364" class="LineNr">364 </span>
<span id="L365" class="LineNr">365 </span><span class="Constant">$top:abort</span>:
<span id="L366" class="LineNr">366 </span>    <span class="subxComment"># print(stderr, &quot;error: top: nothing left in stack&quot;)</span>
<span id="L367" class="LineNr">367 </span>    <span class="subxS1Comment"># . write-buffered(Stderr, &quot;error: top: nothing left in stack&quot;)</span>
<span id="L368" class="LineNr">368 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L369" class="LineNr">369 </span>    68/push  <span class="Constant">&quot;error: <a href='092stack.subx.html#L340'>top</a>: nothing left in stack&quot;</span>/imm32
<span id="L370" class="LineNr">370 </span>    68/push  <span class="SpecialChar"><a href='065write-buffered.subx.html#L209'>Stderr</a></span>/imm32
<span id="L371" class="LineNr">371 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L372" class="LineNr">372 </span>    e8/call  <a href='065write-buffered.subx.html#L8'>write-buffered</a>/disp32
<span id="L373" class="LineNr">373 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L374" class="LineNr">374 </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="L375" class="LineNr">375 </span>    <span class="subxS1Comment"># . flush(Stderr)</span>
<span id="L376" class="LineNr">376 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L377" class="LineNr">377 </span>    68/push  <span class="SpecialChar"><a href='065write-buffered.subx.html#L209'>Stderr</a></span>/imm32
<span id="L378" class="LineNr">378 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L379" class="LineNr">379 </span>    e8/call  <a href='064write-byte.subx.html#L81'>flush</a>/disp32
<span id="L380" class="LineNr">380 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L381" class="LineNr">381 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L382" class="LineNr">382 </span>    <span class="subxS1Comment"># . syscall(exit, 1)</span>
<span id="L383" class="LineNr">383 </span>    bb/copy-to-ebx  1/imm32
<span id="L384" class="LineNr">384 </span>    b8/copy-to-eax  1/imm32/exit
<span id="L385" class="LineNr">385 </span>    cd/syscall  0x80/imm8
<span id="L386" class="LineNr">386 </span>    <span class="subxComment"># never gets here</span>
<span id="L387" class="LineNr">387 </span>
<span id="L388" class="LineNr">388 </span><span class="subxTest">test-top</span>:
<span id="L389" class="LineNr">389 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L390" class="LineNr">390 </span>    55/push-ebp
<span id="L391" class="LineNr">391 </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="L392" class="LineNr">392 </span>    <span class="subxComment"># var stack/ecx = stack of size 8 containing just 0x42</span>
<span id="L393" class="LineNr">393 </span>    68/push  0/imm32
<span id="L394" class="LineNr">394 </span>    68/push  0x42/imm32
<span id="L395" class="LineNr">395 </span>    68/push  8/imm32/size
<span id="L396" class="LineNr">396 </span>    68/push  4/imm32/top
<span id="L397" class="LineNr">397 </span>    89/copy                         3/mod/direct    1/rm32/ecx   <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 ecx</span>
<span id="L398" class="LineNr">398 </span>    <span class="subxComment"># eax = top(stack)</span>
<span id="L399" class="LineNr">399 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L400" class="LineNr">400 </span>    51/push-ecx
<span id="L401" class="LineNr">401 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L402" class="LineNr">402 </span>    e8/call  <a href='092stack.subx.html#L340'>top</a>/disp32
<span id="L403" class="LineNr">403 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L404" class="LineNr">404 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L405" class="LineNr">405 </span>    <span class="subxComment"># check-ints-equal(eax, 42, msg&quot;)</span>
<span id="L406" class="LineNr">406 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L407" class="LineNr">407 </span>    68/push  <span class="Constant">&quot;F - <a href='092stack.subx.html#L388'>test-top</a>: result&quot;</span>/imm32
<span id="L408" class="LineNr">408 </span>    68/push  0x42/imm32
<span id="L409" class="LineNr">409 </span>    50/push-eax
<span id="L410" class="LineNr">410 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L411" class="LineNr">411 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L412" class="LineNr">412 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L413" class="LineNr">413 </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="L414" class="LineNr">414 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L415" class="LineNr">415 </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="L416" class="LineNr">416 </span>    5d/pop-to-ebp
<span id="L417" class="LineNr">417 </span>    c3/return
<span id="L418" class="LineNr">418 </span>
<span id="L419" class="LineNr">419 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->