質問編集履歴
5
コードの追加(最後に追加)
title
CHANGED
|
File without changes
|
body
CHANGED
|
@@ -334,4 +334,259 @@
|
|
|
334
334
|
|
|
335
335
|
|
|
336
336
|
.subsections_via_symbols
|
|
337
|
+
```
|
|
338
|
+
|
|
339
|
+
コードの追加
|
|
340
|
+
---
|
|
341
|
+
ちなみに、-4(%ebp)の部分を詰めて、例えばsample3.sを以下のように書き換えても、プログラムは動きます。ここでは%espを引く値も変えていますが、変えなくても当然動きます。
|
|
342
|
+
|
|
343
|
+
```アセンブリ言語
|
|
344
|
+
#sample2.s
|
|
345
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
346
|
+
.macosx_version_min 10, 12
|
|
347
|
+
.globl _main
|
|
348
|
+
.p2align 4, 0x90
|
|
349
|
+
_main: ## @main
|
|
350
|
+
## BB#0:
|
|
351
|
+
pushl %ebp
|
|
352
|
+
movl %esp, %ebp
|
|
353
|
+
subl $12, %esp
|
|
354
|
+
movl $2, -4(%ebp)
|
|
355
|
+
movl $3, -8(%ebp)
|
|
356
|
+
movl $4, -12(%ebp)
|
|
357
|
+
movl -4(%ebp), %eax
|
|
358
|
+
addl -8(%ebp), %eax
|
|
359
|
+
addl -12(%ebp), %eax
|
|
360
|
+
addl $12, %esp
|
|
361
|
+
popl %ebp
|
|
362
|
+
retl
|
|
363
|
+
|
|
364
|
+
|
|
365
|
+
.subsections_via_symbols
|
|
366
|
+
```
|
|
367
|
+
|
|
368
|
+
新たにsample5~sample8を公開します。
|
|
369
|
+
```C
|
|
370
|
+
//sample5.c
|
|
371
|
+
#include <stdio.h>
|
|
372
|
+
|
|
373
|
+
|
|
374
|
+
|
|
375
|
+
int main(void){
|
|
376
|
+
int a = 1;
|
|
377
|
+
int b = 2;
|
|
378
|
+
int c = 3;
|
|
379
|
+
int d = 4;
|
|
380
|
+
int e = 5;
|
|
381
|
+
return a+b+c+d+e;
|
|
382
|
+
}
|
|
383
|
+
```
|
|
384
|
+
|
|
385
|
+
```
|
|
386
|
+
#sample5.s
|
|
387
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
388
|
+
.macosx_version_min 10, 12
|
|
389
|
+
.globl _main
|
|
390
|
+
.p2align 4, 0x90
|
|
391
|
+
_main: ## @main
|
|
392
|
+
## BB#0:
|
|
393
|
+
pushl %ebp
|
|
394
|
+
movl %esp, %ebp
|
|
395
|
+
subl $24, %esp
|
|
396
|
+
movl $0, -4(%ebp)
|
|
397
|
+
movl $1, -8(%ebp)
|
|
398
|
+
movl $2, -12(%ebp)
|
|
399
|
+
movl $3, -16(%ebp)
|
|
400
|
+
movl $4, -20(%ebp)
|
|
401
|
+
movl $5, -24(%ebp)
|
|
402
|
+
movl -8(%ebp), %eax
|
|
403
|
+
addl -12(%ebp), %eax
|
|
404
|
+
addl -16(%ebp), %eax
|
|
405
|
+
addl -20(%ebp), %eax
|
|
406
|
+
addl -24(%ebp), %eax
|
|
407
|
+
addl $24, %esp
|
|
408
|
+
popl %ebp
|
|
409
|
+
retl
|
|
410
|
+
|
|
411
|
+
|
|
412
|
+
.subsections_via_symbols
|
|
413
|
+
|
|
414
|
+
```
|
|
415
|
+
|
|
416
|
+
```C
|
|
417
|
+
//sample6.c
|
|
418
|
+
#include <stdio.h>
|
|
419
|
+
|
|
420
|
+
|
|
421
|
+
|
|
422
|
+
int main(void){
|
|
423
|
+
int a = 1;
|
|
424
|
+
int b = 2;
|
|
425
|
+
int c = 3;
|
|
426
|
+
int d = 4;
|
|
427
|
+
int e = 5;
|
|
428
|
+
int f = 6;
|
|
429
|
+
return a+b+c+d+e+f;
|
|
430
|
+
}
|
|
431
|
+
```
|
|
432
|
+
|
|
433
|
+
```
|
|
434
|
+
#sample7.s
|
|
435
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
436
|
+
.macosx_version_min 10, 12
|
|
437
|
+
.globl _main
|
|
438
|
+
.p2align 4, 0x90
|
|
439
|
+
_main: ## @main
|
|
440
|
+
## BB#0:
|
|
441
|
+
pushl %ebp
|
|
442
|
+
movl %esp, %ebp
|
|
443
|
+
subl $28, %esp
|
|
444
|
+
movl $0, -4(%ebp)
|
|
445
|
+
movl $1, -8(%ebp)
|
|
446
|
+
movl $2, -12(%ebp)
|
|
447
|
+
movl $3, -16(%ebp)
|
|
448
|
+
movl $4, -20(%ebp)
|
|
449
|
+
movl $5, -24(%ebp)
|
|
450
|
+
movl $6, -28(%ebp)
|
|
451
|
+
movl -8(%ebp), %eax
|
|
452
|
+
addl -12(%ebp), %eax
|
|
453
|
+
addl -16(%ebp), %eax
|
|
454
|
+
addl -20(%ebp), %eax
|
|
455
|
+
addl -24(%ebp), %eax
|
|
456
|
+
addl -28(%ebp), %eax
|
|
457
|
+
addl $28, %esp
|
|
458
|
+
popl %ebp
|
|
459
|
+
retl
|
|
460
|
+
|
|
461
|
+
.subsections_via_symbols
|
|
462
|
+
|
|
463
|
+
```
|
|
464
|
+
|
|
465
|
+
```C
|
|
466
|
+
//sample7.c
|
|
467
|
+
#include <stdio.h>
|
|
468
|
+
|
|
469
|
+
|
|
470
|
+
int foo();
|
|
471
|
+
|
|
472
|
+
int main(void){
|
|
473
|
+
int a = 1;
|
|
474
|
+
int b = 2;
|
|
475
|
+
int c = 3;
|
|
476
|
+
int d = foo();
|
|
477
|
+
int e = 5;
|
|
478
|
+
int f = 6;
|
|
479
|
+
return a+b+c+d+e+f;
|
|
480
|
+
}
|
|
481
|
+
|
|
482
|
+
|
|
483
|
+
int foo(){
|
|
484
|
+
return 100;
|
|
485
|
+
}
|
|
486
|
+
```
|
|
487
|
+
```
|
|
488
|
+
#sample7.s
|
|
489
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
490
|
+
.macosx_version_min 10, 12
|
|
491
|
+
.globl _main
|
|
492
|
+
.p2align 4, 0x90
|
|
493
|
+
_main: ## @main
|
|
494
|
+
## BB#0:
|
|
495
|
+
pushl %ebp
|
|
496
|
+
movl %esp, %ebp
|
|
497
|
+
subl $40, %esp
|
|
498
|
+
movl $0, -4(%ebp)
|
|
499
|
+
movl $1, -8(%ebp)
|
|
500
|
+
movl $2, -12(%ebp)
|
|
501
|
+
movl $3, -16(%ebp)
|
|
502
|
+
calll _foo
|
|
503
|
+
movl %eax, -20(%ebp)
|
|
504
|
+
movl $5, -24(%ebp)
|
|
505
|
+
movl $6, -28(%ebp)
|
|
506
|
+
movl -8(%ebp), %eax
|
|
507
|
+
addl -12(%ebp), %eax
|
|
508
|
+
addl -16(%ebp), %eax
|
|
509
|
+
addl -20(%ebp), %eax
|
|
510
|
+
addl -24(%ebp), %eax
|
|
511
|
+
addl -28(%ebp), %eax
|
|
512
|
+
addl $40, %esp
|
|
513
|
+
popl %ebp
|
|
514
|
+
retl
|
|
515
|
+
|
|
516
|
+
.globl _foo
|
|
517
|
+
.p2align 4, 0x90
|
|
518
|
+
_foo: ## @foo
|
|
519
|
+
## BB#0:
|
|
520
|
+
pushl %ebp
|
|
521
|
+
movl %esp, %ebp
|
|
522
|
+
movl $100, %eax
|
|
523
|
+
popl %ebp
|
|
524
|
+
retl
|
|
525
|
+
|
|
526
|
+
|
|
527
|
+
.subsections_via_symbols
|
|
528
|
+
|
|
529
|
+
```
|
|
530
|
+
|
|
531
|
+
```
|
|
532
|
+
//sample8.c
|
|
533
|
+
#include <stdio.h>
|
|
534
|
+
|
|
535
|
+
int foo();
|
|
536
|
+
|
|
537
|
+
int main(void){
|
|
538
|
+
int a = 1;
|
|
539
|
+
int b = 2;
|
|
540
|
+
int d = foo();
|
|
541
|
+
int e = 5;
|
|
542
|
+
int f = 6;
|
|
543
|
+
return a+b+d+e+f;
|
|
544
|
+
}
|
|
545
|
+
|
|
546
|
+
|
|
547
|
+
int foo(){
|
|
548
|
+
return 100;
|
|
549
|
+
}
|
|
550
|
+
```
|
|
551
|
+
|
|
552
|
+
```
|
|
553
|
+
#sample8.s
|
|
554
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
555
|
+
.macosx_version_min 10, 12
|
|
556
|
+
.globl _main
|
|
557
|
+
.p2align 4, 0x90
|
|
558
|
+
_main: ## @main
|
|
559
|
+
## BB#0:
|
|
560
|
+
pushl %ebp
|
|
561
|
+
movl %esp, %ebp
|
|
562
|
+
subl $24, %esp
|
|
563
|
+
movl $0, -4(%ebp)
|
|
564
|
+
movl $1, -8(%ebp)
|
|
565
|
+
movl $2, -12(%ebp)
|
|
566
|
+
calll _foo
|
|
567
|
+
movl %eax, -16(%ebp)
|
|
568
|
+
movl $5, -20(%ebp)
|
|
569
|
+
movl $6, -24(%ebp)
|
|
570
|
+
movl -8(%ebp), %eax
|
|
571
|
+
addl -12(%ebp), %eax
|
|
572
|
+
addl -16(%ebp), %eax
|
|
573
|
+
addl -20(%ebp), %eax
|
|
574
|
+
addl -24(%ebp), %eax
|
|
575
|
+
addl $24, %esp
|
|
576
|
+
popl %ebp
|
|
577
|
+
retl
|
|
578
|
+
|
|
579
|
+
.globl _foo
|
|
580
|
+
.p2align 4, 0x90
|
|
581
|
+
_foo: ## @foo
|
|
582
|
+
## BB#0:
|
|
583
|
+
pushl %ebp
|
|
584
|
+
movl %esp, %ebp
|
|
585
|
+
movl $100, %eax
|
|
586
|
+
popl %ebp
|
|
587
|
+
retl
|
|
588
|
+
|
|
589
|
+
|
|
590
|
+
.subsections_via_symbols
|
|
591
|
+
|
|
337
592
|
```
|
4
タイトルの変更
title
CHANGED
|
@@ -1,1 +1,1 @@
|
|
|
1
|
-
アセンブリ言語の-4(%ebp)とは？
|
|
1
|
+
アセンブリ言語の"movl $0, -4(%ebp)"とは？
|
body
CHANGED
|
File without changes
|
3
具体例を提示
title
CHANGED
|
File without changes
|
body
CHANGED
|
@@ -114,4 +114,224 @@
|
|
|
114
114
|
|
|
115
115
|
|
|
116
116
|
|
|
117
|
-
Thanks
|
|
117
|
+
Thanks
|
|
118
|
+
|
|
119
|
+
補足
|
|
120
|
+
---
|
|
121
|
+
以下にC言語のsampleコード及びそれに対応するアセンブリコードを5つ記します。
|
|
122
|
+
コマンドは
|
|
123
|
+
gcc -m32 -S sample.c
|
|
124
|
+
です。
|
|
125
|
+
(gcc,i386,OS X)
|
|
126
|
+
|
|
127
|
+
```C
|
|
128
|
+
//sample0.c
|
|
129
|
+
#include <stdio.h>
|
|
130
|
+
|
|
131
|
+
|
|
132
|
+
int main (void)
|
|
133
|
+
{
|
|
134
|
+
|
|
135
|
+
return 0;
|
|
136
|
+
|
|
137
|
+
}
|
|
138
|
+
```
|
|
139
|
+
|
|
140
|
+
```
|
|
141
|
+
#sample0.s
|
|
142
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
143
|
+
.macosx_version_min 10, 12
|
|
144
|
+
.globl _main
|
|
145
|
+
.p2align 4, 0x90
|
|
146
|
+
_main: ## @main
|
|
147
|
+
## BB#0:
|
|
148
|
+
pushl %ebp
|
|
149
|
+
movl %esp, %ebp
|
|
150
|
+
pushl %eax
|
|
151
|
+
xorl %eax, %eax
|
|
152
|
+
movl $0, -4(%ebp)
|
|
153
|
+
addl $4, %esp
|
|
154
|
+
popl %ebp
|
|
155
|
+
retl
|
|
156
|
+
|
|
157
|
+
|
|
158
|
+
.subsections_via_symbols
|
|
159
|
+
```
|
|
160
|
+
|
|
161
|
+
```C
|
|
162
|
+
//sample1.c
|
|
163
|
+
#include <stdio.h>
|
|
164
|
+
|
|
165
|
+
|
|
166
|
+
int main (void)
|
|
167
|
+
{
|
|
168
|
+
int a = 1;
|
|
169
|
+
int b = 2;
|
|
170
|
+
int c = 3;
|
|
171
|
+
|
|
172
|
+
return a + b + c;
|
|
173
|
+
}
|
|
174
|
+
```
|
|
175
|
+
```
|
|
176
|
+
#sample1.s
|
|
177
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
178
|
+
.macosx_version_min 10, 12
|
|
179
|
+
.globl _main
|
|
180
|
+
.p2align 4, 0x90
|
|
181
|
+
_main: ## @main
|
|
182
|
+
## BB#0:
|
|
183
|
+
pushl %ebp
|
|
184
|
+
movl %esp, %ebp
|
|
185
|
+
subl $16, %esp
|
|
186
|
+
movl $0, -4(%ebp)
|
|
187
|
+
movl $1, -8(%ebp)
|
|
188
|
+
movl $2, -12(%ebp)
|
|
189
|
+
movl $3, -16(%ebp)
|
|
190
|
+
movl -8(%ebp), %eax
|
|
191
|
+
addl -12(%ebp), %eax
|
|
192
|
+
addl -16(%ebp), %eax
|
|
193
|
+
addl $16, %esp
|
|
194
|
+
popl %ebp
|
|
195
|
+
retl
|
|
196
|
+
|
|
197
|
+
|
|
198
|
+
.subsections_via_symbols
|
|
199
|
+
```
|
|
200
|
+
|
|
201
|
+
```C
|
|
202
|
+
//sample2.c
|
|
203
|
+
#include <stdio.h>
|
|
204
|
+
|
|
205
|
+
|
|
206
|
+
int main ()
|
|
207
|
+
{
|
|
208
|
+
int a = 2;
|
|
209
|
+
int b = 3;
|
|
210
|
+
int c = 4;
|
|
211
|
+
|
|
212
|
+
return a + b + c;
|
|
213
|
+
}
|
|
214
|
+
```
|
|
215
|
+
```
|
|
216
|
+
#sample2.s
|
|
217
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
218
|
+
.macosx_version_min 10, 12
|
|
219
|
+
.globl _main
|
|
220
|
+
.p2align 4, 0x90
|
|
221
|
+
_main: ## @main
|
|
222
|
+
## BB#0:
|
|
223
|
+
pushl %ebp
|
|
224
|
+
movl %esp, %ebp
|
|
225
|
+
subl $16, %esp
|
|
226
|
+
movl $0, -4(%ebp)
|
|
227
|
+
movl $2, -8(%ebp)
|
|
228
|
+
movl $3, -12(%ebp)
|
|
229
|
+
movl $4, -16(%ebp)
|
|
230
|
+
movl -8(%ebp), %eax
|
|
231
|
+
addl -12(%ebp), %eax
|
|
232
|
+
addl -16(%ebp), %eax
|
|
233
|
+
addl $16, %esp
|
|
234
|
+
popl %ebp
|
|
235
|
+
retl
|
|
236
|
+
|
|
237
|
+
|
|
238
|
+
.subsections_via_symbols
|
|
239
|
+
```
|
|
240
|
+
|
|
241
|
+
|
|
242
|
+
```C
|
|
243
|
+
//sample3.c
|
|
244
|
+
#include <stdio.h>
|
|
245
|
+
|
|
246
|
+
|
|
247
|
+
int foo()
|
|
248
|
+
{
|
|
249
|
+
int a = 2;
|
|
250
|
+
int b = 3;
|
|
251
|
+
int c = 4;
|
|
252
|
+
|
|
253
|
+
return a + b + c;
|
|
254
|
+
}
|
|
255
|
+
```
|
|
256
|
+
```
|
|
257
|
+
#sample3.s
|
|
258
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
259
|
+
.macosx_version_min 10, 12
|
|
260
|
+
.globl _foo
|
|
261
|
+
.p2align 4, 0x90
|
|
262
|
+
_foo: ## @foo
|
|
263
|
+
## BB#0:
|
|
264
|
+
pushl %ebp
|
|
265
|
+
movl %esp, %ebp
|
|
266
|
+
subl $12, %esp
|
|
267
|
+
movl $2, -4(%ebp)
|
|
268
|
+
movl $3, -8(%ebp)
|
|
269
|
+
movl $4, -12(%ebp)
|
|
270
|
+
movl -4(%ebp), %eax
|
|
271
|
+
addl -8(%ebp), %eax
|
|
272
|
+
addl -12(%ebp), %eax
|
|
273
|
+
addl $12, %esp
|
|
274
|
+
popl %ebp
|
|
275
|
+
retl
|
|
276
|
+
|
|
277
|
+
|
|
278
|
+
.subsections_via_symbols
|
|
279
|
+
```
|
|
280
|
+
|
|
281
|
+
|
|
282
|
+
```C
|
|
283
|
+
//sample4.c
|
|
284
|
+
#include <stdio.h>
|
|
285
|
+
|
|
286
|
+
int foo();
|
|
287
|
+
|
|
288
|
+
int main(void){
|
|
289
|
+
return foo();
|
|
290
|
+
}
|
|
291
|
+
|
|
292
|
+
int foo()
|
|
293
|
+
{
|
|
294
|
+
int a = 3;
|
|
295
|
+
int b = 4;
|
|
296
|
+
int c = 5;
|
|
297
|
+
|
|
298
|
+
return a + b + c;
|
|
299
|
+
}
|
|
300
|
+
```
|
|
301
|
+
```
|
|
302
|
+
#sample4.s
|
|
303
|
+
.section __TEXT,__text,regular,pure_instructions
|
|
304
|
+
.macosx_version_min 10, 12
|
|
305
|
+
.globl _main
|
|
306
|
+
.p2align 4, 0x90
|
|
307
|
+
_main: ## @main
|
|
308
|
+
## BB#0:
|
|
309
|
+
pushl %ebp
|
|
310
|
+
movl %esp, %ebp
|
|
311
|
+
subl $8, %esp
|
|
312
|
+
movl $0, -4(%ebp)
|
|
313
|
+
calll _foo
|
|
314
|
+
addl $8, %esp
|
|
315
|
+
popl %ebp
|
|
316
|
+
retl
|
|
317
|
+
|
|
318
|
+
.globl _foo
|
|
319
|
+
.p2align 4, 0x90
|
|
320
|
+
_foo: ## @foo
|
|
321
|
+
## BB#0:
|
|
322
|
+
pushl %ebp
|
|
323
|
+
movl %esp, %ebp
|
|
324
|
+
subl $12, %esp
|
|
325
|
+
movl $3, -4(%ebp)
|
|
326
|
+
movl $4, -8(%ebp)
|
|
327
|
+
movl $5, -12(%ebp)
|
|
328
|
+
movl -4(%ebp), %eax
|
|
329
|
+
addl -8(%ebp), %eax
|
|
330
|
+
addl -12(%ebp), %eax
|
|
331
|
+
addl $12, %esp
|
|
332
|
+
popl %ebp
|
|
333
|
+
retl
|
|
334
|
+
|
|
335
|
+
|
|
336
|
+
.subsections_via_symbols
|
|
337
|
+
```
|
2
誤字の修正、タグの追加、文章の軽微な修正
title
CHANGED
|
File without changes
|
body
CHANGED
|
@@ -1,4 +1,6 @@
|
|
|
1
1
|
アセンブリ初学者です。
|
|
2
|
+
アセンブリをより深く理解したく質問したしだいです。
|
|
3
|
+
|
|
2
4
|
gcc -S で吐かれたアセンブリコードを見て、以下のような記述がありました
|
|
3
5
|
|
|
4
6
|
```アセンブリ言語
|
|
@@ -112,4 +114,4 @@
|
|
|
112
114
|
|
|
113
115
|
|
|
114
116
|
|
|
115
|
-
|
|
117
|
+
Thanks
|
1
タグを追加
title
CHANGED
|
File without changes
|
body
CHANGED
|
File without changes
|