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
|
<!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 - 117write-int-hex.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; }
.LineNr { }
.subxTest { color: #5f8700; }
.subxS1Comment { color: #0000af; }
.subxFunction { color: #af5f00; text-decoration: underline; }
.Constant { color: #008787; }
.Normal { color: #000000; background-color: #ffffd7; padding-bottom: 1px; }
.subxH1Comment { color: #005faf; text-decoration: underline; }
-->
</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/117write-int-hex.subx'>https://github.com/akkartik/mu/blob/main/117write-int-hex.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Write out the (hex) textual representation of numbers.</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="subxComment"># convert the lowest nibble of eax to ascii and return it in the lowest byte of eax</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxFunction">to-hex-char</span>: <span class="subxComment"># in/eax: int -> out/eax: int</span>
<span id="L10" class="LineNr"> 10 </span> <span class="subxComment"># no error checking; accepts argument in eax</span>
<span id="L11" class="LineNr"> 11 </span> <span class="subxComment"># if (eax <= 9) return eax + '0'</span>
<span id="L12" class="LineNr"> 12 </span> 3d/compare-eax-with 0x9/imm32/9
<span id="L13" class="LineNr"> 13 </span> 7f/jump-if-> $to-hex-char:else/disp8
<span id="L14" class="LineNr"> 14 </span> 05/add-to-eax 0x30/imm32/0
<span id="L15" class="LineNr"> 15 </span> c3/return
<span id="L16" class="LineNr"> 16 </span><span class="Constant">$to-hex-char:else</span>:
<span id="L17" class="LineNr"> 17 </span> <span class="subxComment"># otherwise return eax + 'a' - 10</span>
<span id="L18" class="LineNr"> 18 </span> 05/add-to-eax 0x57/imm32/a-10
<span id="L19" class="LineNr"> 19 </span> c3/return
<span id="L20" class="LineNr"> 20 </span>
<span id="L21" class="LineNr"> 21 </span><span class="subxFunction">append-byte-hex</span>: <span class="subxComment"># f: (addr stream byte), n: int</span>
<span id="L22" class="LineNr"> 22 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L23" class="LineNr"> 23 </span> 55/push-ebp
<span id="L24" class="LineNr"> 24 </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="L25" class="LineNr"> 25 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L26" class="LineNr"> 26 </span> 50/push-eax
<span id="L27" class="LineNr"> 27 </span> <span class="subxComment"># AL = convert upper nibble to hex</span>
<span id="L28" class="LineNr"> 28 </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="L29" class="LineNr"> 29 </span> c1/shift 5/subop/logic-right 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> 4/imm8 <span class="subxComment"># shift eax right by 4 bits, while padding zeroes</span>
<span id="L30" class="LineNr"> 30 </span> 25/and-eax 0xf/imm32
<span id="L31" class="LineNr"> 31 </span> <span class="subxS1Comment"># . AL = to-hex-char(AL)</span>
<span id="L32" class="LineNr"> 32 </span> e8/call <a href='117write-int-hex.subx.html#L9'>to-hex-char</a>/disp32
<span id="L33" class="LineNr"> 33 </span> <span class="subxComment"># append-byte(f, AL)</span>
<span id="L34" class="LineNr"> 34 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L35" class="LineNr"> 35 </span> 50/push-eax
<span id="L36" class="LineNr"> 36 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L37" class="LineNr"> 37 </span> <span class="subxS2Comment"># . . call</span>
<span id="L38" class="LineNr"> 38 </span> e8/call <a href='115write-byte.subx.html#L12'>append-byte</a>/disp32
<span id="L39" class="LineNr"> 39 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L40" class="LineNr"> 40 </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="L41" class="LineNr"> 41 </span> <span class="subxComment"># AL = convert lower nibble to hex</span>
<span id="L42" class="LineNr"> 42 </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="L43" class="LineNr"> 43 </span> 25/and-eax 0xf/imm32
<span id="L44" class="LineNr"> 44 </span> <span class="subxS1Comment"># . AL = to-hex-char(AL)</span>
<span id="L45" class="LineNr"> 45 </span> e8/call <a href='117write-int-hex.subx.html#L9'>to-hex-char</a>/disp32
<span id="L46" class="LineNr"> 46 </span> <span class="subxComment"># append-byte(f, AL)</span>
<span id="L47" class="LineNr"> 47 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L48" class="LineNr"> 48 </span> 50/push-eax
<span id="L49" class="LineNr"> 49 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L50" class="LineNr"> 50 </span> <span class="subxS2Comment"># . . call</span>
<span id="L51" class="LineNr"> 51 </span> e8/call <a href='115write-byte.subx.html#L12'>append-byte</a>/disp32
<span id="L52" class="LineNr"> 52 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L53" class="LineNr"> 53 </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="L54" class="LineNr"> 54 </span><span class="Constant">$append-byte-hex:end</span>:
<span id="L55" class="LineNr"> 55 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L56" class="LineNr"> 56 </span> 58/pop-to-eax
<span id="L57" class="LineNr"> 57 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L58" class="LineNr"> 58 </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="L59" class="LineNr"> 59 </span> 5d/pop-to-ebp
<span id="L60" class="LineNr"> 60 </span> c3/return
<span id="L61" class="LineNr"> 61 </span>
<span id="L62" class="LineNr"> 62 </span><span class="subxTest">test-append-byte-hex</span>:
<span id="L63" class="LineNr"> 63 </span> <span class="subxH1Comment"># - check that append-byte-hex adds the hex textual representation</span>
<span id="L64" class="LineNr"> 64 </span> <span class="subxComment"># setup</span>
<span id="L65" class="LineNr"> 65 </span> <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L66" class="LineNr"> 66 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L67" class="LineNr"> 67 </span> 68/push <a href='108write.subx.html#L125'>_test-stream</a>/imm32
<span id="L68" class="LineNr"> 68 </span> <span class="subxS2Comment"># . . call</span>
<span id="L69" class="LineNr"> 69 </span> e8/call <a href='106stream.subx.html#L20'>clear-stream</a>/disp32
<span id="L70" class="LineNr"> 70 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L71" class="LineNr"> 71 </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="L72" class="LineNr"> 72 </span> <span class="subxComment"># append-byte-hex(_test-stream, 0xa) # exercises digit, non-digit as well as leading zero</span>
<span id="L73" class="LineNr"> 73 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L74" class="LineNr"> 74 </span> 68/push 0xa/imm32
<span id="L75" class="LineNr"> 75 </span> 68/push <a href='108write.subx.html#L125'>_test-stream</a>/imm32
<span id="L76" class="LineNr"> 76 </span> <span class="subxS2Comment"># . . call</span>
<span id="L77" class="LineNr"> 77 </span> e8/call <a href='117write-int-hex.subx.html#L21'>append-byte-hex</a>/disp32
<span id="L78" class="LineNr"> 78 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L79" class="LineNr"> 79 </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="L80" class="LineNr"> 80 </span> <span class="subxComment"># check-stream-equal(_test-stream, "0a", msg)</span>
<span id="L81" class="LineNr"> 81 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L82" class="LineNr"> 82 </span> 68/push <span class="Constant">"F - test-append-byte-hex"</span>/imm32
<span id="L83" class="LineNr"> 83 </span> 68/push <span class="Constant">"0a"</span>/imm32
<span id="L84" class="LineNr"> 84 </span> 68/push <a href='108write.subx.html#L125'>_test-stream</a>/imm32
<span id="L85" class="LineNr"> 85 </span> <span class="subxS2Comment"># . . call</span>
<span id="L86" class="LineNr"> 86 </span> e8/call <a href='109stream-equal.subx.html#L194'>check-stream-equal</a>/disp32
<span id="L87" class="LineNr"> 87 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L88" class="LineNr"> 88 </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="L89" class="LineNr"> 89 </span> <span class="subxS1Comment"># . end</span>
<span id="L90" class="LineNr"> 90 </span> c3/return
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="subxFunction">write-int32-hex</span>: <span class="subxComment"># f: (addr stream byte), n: int</span>
<span id="L93" class="LineNr"> 93 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L94" class="LineNr"> 94 </span> 55/push-ebp
<span id="L95" class="LineNr"> 95 </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="L96" class="LineNr"> 96 </span><span class="Constant">$write-int32-hex:hex-prefix</span>:
<span id="L97" class="LineNr"> 97 </span> <span class="subxComment"># write(f, "0x")</span>
<span id="L98" class="LineNr"> 98 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L99" class="LineNr"> 99 </span> 68/push <span class="Constant">"0x"</span>/imm32
<span id="L100" class="LineNr">100 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L101" class="LineNr">101 </span> <span class="subxS2Comment"># . . call</span>
<span id="L102" class="LineNr">102 </span> e8/call <a href='108write.subx.html#L11'>write</a>/disp32
<span id="L103" class="LineNr">103 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L104" class="LineNr">104 </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="L105" class="LineNr">105 </span><span class="Constant">$write-int32-hex:rest</span>:
<span id="L106" class="LineNr">106 </span> <span class="subxComment"># write-int32-hex-bits(f, n, 32)</span>
<span id="L107" class="LineNr">107 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L108" class="LineNr">108 </span> 68/push 0x20/imm32
<span id="L109" class="LineNr">109 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L110" class="LineNr">110 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L111" class="LineNr">111 </span> <span class="subxS2Comment"># . . call</span>
<span id="L112" class="LineNr">112 </span> e8/call <a href='117write-int-hex.subx.html#L123'>write-int32-hex-bits</a>/disp32
<span id="L113" class="LineNr">113 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L114" class="LineNr">114 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to esp</span>
<span id="L115" class="LineNr">115 </span><span class="Constant">$write-int32-hex:end</span>:
<span id="L116" class="LineNr">116 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L117" class="LineNr">117 </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="L118" class="LineNr">118 </span> 5d/pop-to-ebp
<span id="L119" class="LineNr">119 </span> c3/return
<span id="L120" class="LineNr">120 </span>
<span id="L121" class="LineNr">121 </span><span class="subxComment"># print rightmost 'bits' of 'n'</span>
<span id="L122" class="LineNr">122 </span><span class="subxComment"># bits must be multiple of 4</span>
<span id="L123" class="LineNr">123 </span><span class="subxFunction">write-int32-hex-bits</span>: <span class="subxComment"># f: (addr stream byte), n: int, bits: int</span>
<span id="L124" class="LineNr">124 </span> <span class="subxComment"># pseudocode:</span>
<span id="L125" class="LineNr">125 </span> <span class="subxComment"># bits -= 4</span>
<span id="L126" class="LineNr">126 </span> <span class="subxComment"># while true</span>
<span id="L127" class="LineNr">127 </span> <span class="subxComment"># if (bits < 0) break</span>
<span id="L128" class="LineNr">128 </span> <span class="subxComment"># eax = n >> bits</span>
<span id="L129" class="LineNr">129 </span> <span class="subxComment"># eax = eax & 0xf</span>
<span id="L130" class="LineNr">130 </span> <span class="subxComment"># append-byte(f, AL)</span>
<span id="L131" class="LineNr">131 </span> <span class="subxComment"># bits -= 4</span>
<span id="L132" class="LineNr">132 </span> <span class="subxComment">#</span>
<span id="L133" class="LineNr">133 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L134" class="LineNr">134 </span> 55/push-ebp
<span id="L135" class="LineNr">135 </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="L136" class="LineNr">136 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L137" class="LineNr">137 </span> 50/push-eax
<span id="L138" class="LineNr">138 </span> 51/push-ecx
<span id="L139" class="LineNr">139 </span> <span class="subxComment"># ecx = bits-4</span>
<span id="L140" class="LineNr">140 </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="L141" class="LineNr">141 </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="L142" class="LineNr">142 </span><span class="Constant">$write-int32-hex-bits:loop</span>:
<span id="L143" class="LineNr">143 </span> <span class="subxComment"># if (bits < 0) break</span>
<span id="L144" class="LineNr">144 </span> 81 7/subop/compare 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> 0/imm32 <span class="subxComment"># compare ecx</span>
<span id="L145" class="LineNr">145 </span> 7c/jump-if-< $write-int32-hex-bits:end/disp8
<span id="L146" class="LineNr">146 </span> <span class="subxComment"># eax = n >> bits</span>
<span id="L147" class="LineNr">147 </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="L148" class="LineNr">148 </span> d3/>>ecx 5/subop/pad-zeroes 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> <span class="Normal"> . </span> <span class="subxComment"># shift eax right by ecx bits, padding zeroes</span>
<span id="L149" class="LineNr">149 </span> <span class="subxComment"># eax = to-hex-char(AL)</span>
<span id="L150" class="LineNr">150 </span> 25/and-eax 0xf/imm32
<span id="L151" class="LineNr">151 </span> e8/call <a href='117write-int-hex.subx.html#L9'>to-hex-char</a>/disp32
<span id="L152" class="LineNr">152 </span> <span class="subxComment"># append-byte(f, AL)</span>
<span id="L153" class="LineNr">153 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L154" class="LineNr">154 </span> 50/push-eax
<span id="L155" class="LineNr">155 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L156" class="LineNr">156 </span> <span class="subxS2Comment"># . . call</span>
<span id="L157" class="LineNr">157 </span> e8/call <a href='115write-byte.subx.html#L12'>append-byte</a>/disp32
<span id="L158" class="LineNr">158 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L159" class="LineNr">159 </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="L160" class="LineNr">160 </span> <span class="subxComment"># bits -= 4</span>
<span id="L161" class="LineNr">161 </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="L162" class="LineNr">162 </span> eb/jump $write-int32-hex-bits:<span class="Constant">loop</span>/disp8
<span id="L163" class="LineNr">163 </span><span class="Constant">$write-int32-hex-bits:end</span>:
<span id="L164" class="LineNr">164 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L165" class="LineNr">165 </span> 59/pop-to-ecx
<span id="L166" class="LineNr">166 </span> 58/pop-to-eax
<span id="L167" class="LineNr">167 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L168" class="LineNr">168 </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="L169" class="LineNr">169 </span> 5d/pop-to-ebp
<span id="L170" class="LineNr">170 </span> c3/return
<span id="L171" class="LineNr">171 </span>
<span id="L172" class="LineNr">172 </span><span class="subxTest">test-write-int32-hex</span>:
<span id="L173" class="LineNr">173 </span> <span class="subxH1Comment"># - check that write-int32-hex prints the hex textual representation</span>
<span id="L174" class="LineNr">174 </span> <span class="subxComment"># setup</span>
<span id="L175" class="LineNr">175 </span> <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L176" class="LineNr">176 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L177" class="LineNr">177 </span> 68/push <a href='108write.subx.html#L125'>_test-stream</a>/imm32
<span id="L178" class="LineNr">178 </span> <span class="subxS2Comment"># . . call</span>
<span id="L179" class="LineNr">179 </span> e8/call <a href='106stream.subx.html#L20'>clear-stream</a>/disp32
<span id="L180" class="LineNr">180 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L181" class="LineNr">181 </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="L182" class="LineNr">182 </span> <span class="subxComment"># write-int32-hex(_test-stream, 0x8899aa)</span>
<span id="L183" class="LineNr">183 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L184" class="LineNr">184 </span> 68/push 0x8899aa/imm32
<span id="L185" class="LineNr">185 </span> 68/push <a href='108write.subx.html#L125'>_test-stream</a>/imm32
<span id="L186" class="LineNr">186 </span> <span class="subxS2Comment"># . . call</span>
<span id="L187" class="LineNr">187 </span> e8/call <a href='117write-int-hex.subx.html#L92'>write-int32-hex</a>/disp32
<span id="L188" class="LineNr">188 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L189" class="LineNr">189 </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="L190" class="LineNr">190 </span> <span class="subxComment"># check-stream-equal(_test-stream, "0x008899aa", msg)</span>
<span id="L191" class="LineNr">191 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L192" class="LineNr">192 </span> 68/push <span class="Constant">"F - test-write-int32-hex"</span>/imm32
<span id="L193" class="LineNr">193 </span> 68/push <span class="Constant">"0x008899aa"</span>/imm32
<span id="L194" class="LineNr">194 </span> 68/push <a href='108write.subx.html#L125'>_test-stream</a>/imm32
<span id="L195" class="LineNr">195 </span> <span class="subxS2Comment"># . . call</span>
<span id="L196" class="LineNr">196 </span> e8/call <a href='109stream-equal.subx.html#L194'>check-stream-equal</a>/disp32
<span id="L197" class="LineNr">197 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L198" class="LineNr">198 </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="L199" class="LineNr">199 </span> <span class="subxS1Comment"># . end</span>
<span id="L200" class="LineNr">200 </span> c3/return
<span id="L201" class="LineNr">201 </span>
<span id="L202" class="LineNr">202 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|