aboutsummaryrefslogtreecommitdiff
path: root/include/opcode/i386.h
blob: 47fa26114c2a4fb221d293836d6d5479ee70e18e (plain)
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
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
/* i386-opcode.h -- Intel 80386 opcode table
   Copyright 1989, 91, 92, 93, 94, 95, 96, 1997 Free Software Foundation.

This file is part of GAS, the GNU Assembler, and GDB, the GNU Debugger.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* The NON_BROKEN_OPCODES cases use the operands in the reverse order
   from that documented in the Intel manuals.  The opcode values are
   such that they actually generate different instructions.  These
   values must not be changed, as they are the values generated by the
   UnixWare assembler, and possibly other ix86 assemblers.  */

static const template i386_optab[] = {

#define _ None
/* move instructions */
#define MOV_AX_DISP32 0xa0
{ "mov", 2, 0xa0, _, DW|NoModrm, { Disp32, Acc, 0 } },
{ "mov", 2, 0x88, _, DW|Modrm, { Reg, Reg|Mem, 0 } },
{ "mov", 2, 0xb0, _, ShortFormW, { Imm, Reg, 0 } },
{ "mov", 2, 0xc6, _,  W|Modrm,  { Imm, Reg|Mem, 0 } },
{ "mov", 2, 0x8c, _, D|Modrm,  { SReg3|SReg2, Reg16|Mem, 0 } },
/* move to/from control debug registers */
{ "mov", 2, 0x0f20, _, D|Modrm, { Control, Reg32, 0} },
{ "mov", 2, 0x0f21, _, D|Modrm, { Debug, Reg32, 0} },
{ "mov", 2, 0x0f24, _, D|Modrm, { Test, Reg32, 0} },

/* move with sign extend */
/* "movsbl" & "movsbw" must not be unified into "movsb" to avoid
   conflict with the "movs" string move instruction.  Thus,
   {"movsb", 2, 0x0fbe, _, ReverseRegRegmem|Modrm, { Reg8|Mem,  Reg16|Reg32, 0} },
   is not kosher; we must seperate the two instructions. */
{"movsbl", 2, 0x0fbe, _, ReverseRegRegmem|Modrm|Data32, { Reg8|Mem,  Reg32, 0} },
{"movsbw", 2, 0x0fbe, _, ReverseRegRegmem|Modrm|Data16, { Reg8|Mem,  Reg16, 0} },
{"movswl", 2, 0x0fbf, _, ReverseRegRegmem|Modrm, { Reg16|Mem, Reg32, 0} },

/* move with zero extend */
{"movzb", 2, 0x0fb6, _, ReverseRegRegmem|Modrm, { Reg8|Mem, Reg16|Reg32, 0} },
{"movzwl", 2, 0x0fb7, _, ReverseRegRegmem|Modrm, { Reg16|Mem, Reg32, 0} },

/* push instructions */
{"push", 1, 0x50, _, ShortForm, { WordReg,0,0 } },
{"push", 1, 0xff, 0x6,  Modrm, { WordReg|WordMem, 0, 0 } },
{"push", 1, 0x6a, _, NoModrm, { Imm8S, 0, 0} },
{"push", 1, 0x68, _, NoModrm, { Imm16|Imm32, 0, 0} },
{"push", 1, 0x06, _,  Seg2ShortForm, { SReg2,0,0 } },
{"push", 1, 0x0fa0, _, Seg3ShortForm, { SReg3,0,0 } },
/* push all */
{"pusha", 0, 0x60, _, NoModrm, { 0, 0, 0 } },

/* pop instructions */
{"pop", 1, 0x58, _, ShortForm, { WordReg,0,0 } },
{"pop", 1, 0x8f, 0x0,  Modrm, { WordReg|WordMem, 0, 0 } },
#define POP_SEG_SHORT 0x7
{"pop", 1, 0x07, _,  Seg2ShortForm, { SReg2,0,0 } },
{"pop", 1, 0x0fa1, _, Seg3ShortForm, { SReg3,0,0 } },
/* pop all */
{"popa", 0, 0x61, _, NoModrm, { 0, 0, 0 } },

/* xchg exchange instructions
   xchg commutes:  we allow both operand orders */
{"xchg", 2, 0x90, _, ShortForm, { WordReg, Acc, 0 } },
{"xchg", 2, 0x90, _, ShortForm, { Acc, WordReg, 0 } },
{"xchg", 2, 0x86, _, W|Modrm, { Reg, Reg|Mem, 0 } },
{"xchg", 2, 0x86, _, W|Modrm, { Reg|Mem, Reg, 0 } },

/* in/out from ports */
{"in", 2, 0xe4, _, W|NoModrm, { Imm8, Acc, 0 } },
{"in", 2, 0xec, _, W|NoModrm, { InOutPortReg, Acc, 0 } },
{"in", 1, 0xe4, _, W|NoModrm, { Imm8, 0, 0 } },
{"in", 1, 0xec, _, W|NoModrm, { InOutPortReg, 0, 0 } },
{"out", 2, 0xe6, _, W|NoModrm, { Acc, Imm8, 0 } },
{"out", 2, 0xee, _, W|NoModrm, { Acc, InOutPortReg, 0 } },
{"out", 1, 0xe6, _, W|NoModrm, { Imm8, 0, 0 } },
{"out", 1, 0xee, _, W|NoModrm, { InOutPortReg, 0, 0 } },

/* load effective address */
{"lea", 2, 0x8d, _, Modrm, { WordMem, WordReg, 0 } },

/* load segment registers from memory */
{"lds", 2, 0xc5, _, Modrm, { Mem, Reg32, 0} },
{"les", 2, 0xc4, _, Modrm, { Mem, Reg32, 0} },
{"lfs", 2, 0x0fb4, _, Modrm, { Mem, Reg32, 0} },
{"lgs", 2, 0x0fb5, _, Modrm, { Mem, Reg32, 0} },
{"lss", 2, 0x0fb2, _, Modrm, { Mem, Reg32, 0} },

/* flags register instructions */
{"clc", 0, 0xf8, _, NoModrm, { 0, 0, 0} },
{"cld", 0, 0xfc, _, NoModrm, { 0, 0, 0} },
{"cli", 0, 0xfa, _, NoModrm, { 0, 0, 0} },
{"clts", 0, 0x0f06, _, NoModrm, { 0, 0, 0} },
{"cmc", 0, 0xf5, _, NoModrm, { 0, 0, 0} },
{"lahf", 0, 0x9f, _, NoModrm, { 0, 0, 0} },
{"sahf", 0, 0x9e, _, NoModrm, { 0, 0, 0} },
{"pushfl", 0, 0x9c, _, NoModrm|Data32, { 0, 0, 0} },
{"popfl", 0, 0x9d, _, NoModrm|Data32, { 0, 0, 0} },
{"pushfw", 0, 0x9c, _, NoModrm|Data16, { 0, 0, 0} },
{"popfw", 0, 0x9d, _, NoModrm|Data16, { 0, 0, 0} },
{"pushf", 0, 0x9c, _, NoModrm, { 0, 0, 0} },
{"popf", 0, 0x9d, _, NoModrm, { 0, 0, 0} },
{"stc", 0, 0xf9, _, NoModrm, { 0, 0, 0} },
{"std", 0, 0xfd, _, NoModrm, { 0, 0, 0} },
{"sti", 0, 0xfb, _, NoModrm, { 0, 0, 0} },

{"add", 2, 0x0,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"add", 2, 0x83, 0,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"add", 2, 0x4,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"add", 2, 0x80, 0, W|Modrm, { Imm, Reg|Mem, 0} },

{"inc", 1, 0x40, _, ShortForm, { WordReg, 0, 0} },
{"inc", 1, 0xfe, 0, W|Modrm, { Reg|Mem, 0, 0} },

{"sub", 2, 0x28,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"sub", 2, 0x83, 5,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"sub", 2, 0x2c,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"sub", 2, 0x80, 5,  W|Modrm, { Imm, Reg|Mem, 0} },

{"dec", 1, 0x48, _, ShortForm, { WordReg, 0, 0} },
{"dec", 1, 0xfe, 1, W|Modrm, { Reg|Mem, 0, 0} },

{"sbb", 2, 0x18,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"sbb", 2, 0x83, 3,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"sbb", 2, 0x1c,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"sbb", 2, 0x80, 3,  W|Modrm, { Imm, Reg|Mem, 0} },

{"cmp", 2, 0x38,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"cmp", 2, 0x83, 7,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"cmp", 2, 0x3c,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"cmp", 2, 0x80, 7,  W|Modrm, { Imm, Reg|Mem, 0} },

{"test", 2, 0x84, _, W|Modrm, { Reg|Mem, Reg, 0} },
{"test", 2, 0x84, _, W|Modrm, { Reg, Reg|Mem, 0} },
{"test", 2, 0xa8, _, W|NoModrm, { Imm, Acc, 0} },
{"test", 2, 0xf6, 0, W|Modrm, { Imm, Reg|Mem, 0} },

{"and", 2, 0x20,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"and", 2, 0x83, 4,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"and", 2, 0x24,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"and", 2, 0x80, 4,  W|Modrm, { Imm, Reg|Mem, 0} },

{"or", 2, 0x08,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"or", 2, 0x83, 1,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"or", 2, 0x0c,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"or", 2, 0x80, 1,  W|Modrm, { Imm, Reg|Mem, 0} },

{"xor", 2, 0x30,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"xor", 2, 0x83, 6,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"xor", 2, 0x34,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"xor", 2, 0x80, 6,  W|Modrm, { Imm, Reg|Mem, 0} },

/* iclr with 1 operand is really xor with 2 operands.  */
{"clr", 1, 0x30, _, W|Modrm|iclrKludge, { Reg } },

{"adc", 2, 0x10,  _, DW|Modrm, { Reg, Reg|Mem, 0} },
{"adc", 2, 0x83, 2,  Modrm, { Imm8S, WordReg|WordMem, 0} },
{"adc", 2, 0x14,  _,  W|NoModrm, { Imm,  Acc,    0} },
{"adc", 2, 0x80, 2,  W|Modrm, { Imm, Reg|Mem, 0} },

{"neg", 1, 0xf6, 3, W|Modrm, { Reg|Mem, 0, 0} },
{"not", 1, 0xf6, 2, W|Modrm, { Reg|Mem, 0, 0} },

{"aaa", 0, 0x37, _, NoModrm, { 0, 0, 0} },
{"aas", 0, 0x3f, _, NoModrm, { 0, 0, 0} },
{"daa", 0, 0x27, _, NoModrm, { 0, 0, 0} },
{"das", 0, 0x2f, _, NoModrm, { 0, 0, 0} },
{"aad", 0, 0xd50a, _, NoModrm, { 0, 0, 0} },
{"aam", 0, 0xd40a, _, NoModrm, { 0, 0, 0} },

/* conversion insns */
/* conversion:  intel naming */
{"cbw", 0, 0x98, _, NoModrm|Data16, { 0, 0, 0} },
{"cwd", 0, 0x99, _, NoModrm|Data16, { 0, 0, 0} },
{"cwde", 0, 0x98, _, NoModrm|Data32, { 0, 0, 0} },
{"cdq", 0, 0x99, _, NoModrm|Data32, { 0, 0, 0} },
/*  att naming */
{"cbtw", 0, 0x98, _, NoModrm|Data16, { 0, 0, 0} },
{"cwtl", 0, 0x98, _, NoModrm|Data32, { 0, 0, 0} },
{"cwtd", 0, 0x99, _, NoModrm|Data16, { 0, 0, 0} },
{"cltd", 0, 0x99, _, NoModrm|Data32, { 0, 0, 0} },

/* Warning! the mul/imul (opcode 0xf6) must only have 1 operand!  They are
   expanding 64-bit multiplies, and *cannot* be selected to accomplish
   'imul %ebx, %eax' (opcode 0x0faf must be used in this case)
   These multiplies can only be selected with single operand forms. */
{"mul",  1, 0xf6, 4, W|Modrm, { Reg|Mem, 0, 0} },
{"imul", 1, 0xf6, 5, W|Modrm, { Reg|Mem, 0, 0} },




/* imulKludge here is needed to reverse the i.rm.reg & i.rm.regmem fields.
   These instructions are exceptions:  'imul $2, %eax, %ecx' would put
   '%eax' in the reg field and '%ecx' in the regmem field if we did not
   switch them. */
{"imul", 2, 0x0faf, _, Modrm|ReverseRegRegmem, { WordReg|Mem, WordReg, 0} },
{"imul", 3, 0x6b, _, Modrm|ReverseRegRegmem, { Imm8S, WordReg|Mem, WordReg} },
{"imul", 3, 0x69, _, Modrm|ReverseRegRegmem, { Imm16|Imm32, WordReg|Mem, WordReg} },
/*
  imul with 2 operands mimicks imul with 3 by puting register both
  in i.rm.reg & i.rm.regmem fields
*/
{"imul", 2, 0x6b, _, Modrm|imulKludge, { Imm8S, WordReg, 0} },
{"imul", 2, 0x69, _, Modrm|imulKludge, { Imm16|Imm32, WordReg, 0} },
{"div", 1, 0xf6, 6, W|Modrm, { Reg|Mem, 0, 0} },
{"div", 2, 0xf6, 6, W|Modrm, { Reg|Mem, Acc, 0} },
{"idiv", 1, 0xf6, 7, W|Modrm, { Reg|Mem, 0, 0} },
{"idiv", 2, 0xf6, 7, W|Modrm, { Reg|Mem, Acc, 0} },

{"rol", 2, 0xd0, 0, W|Modrm, { Imm1, Reg|Mem, 0} },
{"rol", 2, 0xc0, 0, W|Modrm, { Imm8, Reg|Mem, 0} },
{"rol", 2, 0xd2, 0, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"rol", 1, 0xd0, 0, W|Modrm, { Reg|Mem, 0, 0} },

{"ror", 2, 0xd0, 1, W|Modrm, { Imm1, Reg|Mem, 0} },
{"ror", 2, 0xc0, 1, W|Modrm, { Imm8, Reg|Mem, 0} },
{"ror", 2, 0xd2, 1, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"ror", 1, 0xd0, 1, W|Modrm, { Reg|Mem, 0, 0} },

{"rcl", 2, 0xd0, 2, W|Modrm, { Imm1, Reg|Mem, 0} },
{"rcl", 2, 0xc0, 2, W|Modrm, { Imm8, Reg|Mem, 0} },
{"rcl", 2, 0xd2, 2, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"rcl", 1, 0xd0, 2, W|Modrm, { Reg|Mem, 0, 0} },

{"rcr", 2, 0xd0, 3, W|Modrm, { Imm1, Reg|Mem, 0} },
{"rcr", 2, 0xc0, 3, W|Modrm, { Imm8, Reg|Mem, 0} },
{"rcr", 2, 0xd2, 3, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"rcr", 1, 0xd0, 3, W|Modrm, { Reg|Mem, 0, 0} },

{"sal", 2, 0xd0, 4, W|Modrm, { Imm1, Reg|Mem, 0} },
{"sal", 2, 0xc0, 4, W|Modrm, { Imm8, Reg|Mem, 0} },
{"sal", 2, 0xd2, 4, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"sal", 1, 0xd0, 4, W|Modrm, { Reg|Mem, 0, 0} },
{"shl", 2, 0xd0, 4, W|Modrm, { Imm1, Reg|Mem, 0} },
{"shl", 2, 0xc0, 4, W|Modrm, { Imm8, Reg|Mem, 0} },
{"shl", 2, 0xd2, 4, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"shl", 1, 0xd0, 4, W|Modrm, { Reg|Mem, 0, 0} },

{"shld", 3, 0x0fa4, _, Modrm, { Imm8, WordReg, WordReg|Mem} },
{"shld", 3, 0x0fa5, _, Modrm, { ShiftCount, WordReg, WordReg|Mem} },
{"shld", 2, 0x0fa5, _, Modrm, { WordReg, WordReg|Mem, 0} },

{"shr", 2, 0xd0, 5, W|Modrm, { Imm1, Reg|Mem, 0} },
{"shr", 2, 0xc0, 5, W|Modrm, { Imm8, Reg|Mem, 0} },
{"shr", 2, 0xd2, 5, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"shr", 1, 0xd0, 5, W|Modrm, { Reg|Mem, 0, 0} },

{"shrd", 3, 0x0fac, _, Modrm, { Imm8, WordReg, WordReg|Mem} },
{"shrd", 3, 0x0fad, _, Modrm, { ShiftCount, WordReg, WordReg|Mem} },
{"shrd", 2, 0x0fad, _, Modrm, { WordReg, WordReg|Mem, 0} },

{"sar", 2, 0xd0, 7, W|Modrm, { Imm1, Reg|Mem, 0} },
{"sar", 2, 0xc0, 7, W|Modrm, { Imm8, Reg|Mem, 0} },
{"sar", 2, 0xd2, 7, W|Modrm, { ShiftCount, Reg|Mem, 0} },
{"sar", 1, 0xd0, 7, W|Modrm, { Reg|Mem, 0, 0} },

/* control transfer instructions */
#define CALL_PC_RELATIVE 0xe8
{"call", 1, 0xe8, _, JumpDword, { Disp32, 0, 0} },
{"call", 1, 0xff, 2, Modrm|Data32, { Reg|Mem|JumpAbsolute, 0, 0} },
{"callw", 1, 0xff, 2, Modrm|Data16, { Reg|Mem|JumpAbsolute, 0, 0} },
#define CALL_FAR_IMMEDIATE 0x9a
{"lcall", 2, 0x9a, _, JumpInterSegment, { Imm16, Imm32, 0} },
{"lcall", 1, 0xff, 3, Modrm|Data32, { Mem, 0, 0} },
{"lcallw", 1, 0xff, 3, Modrm|Data16, { Mem, 0, 0} },

#define JUMP_PC_RELATIVE 0xeb
{"jmp", 1, 0xeb, _, Jump, { Disp, 0, 0} },
{"jmp", 1, 0xff, 4, Modrm, { Reg32|Mem|JumpAbsolute, 0, 0} },
#define JUMP_FAR_IMMEDIATE 0xea
{"ljmp", 2, 0xea, _, JumpInterSegment, { Imm16, Imm32, 0} },
{"ljmp", 1, 0xff, 5, Modrm|Data32, { Mem, 0, 0} },

{"ret", 0, 0xc3, _, NoModrm|Data32, { 0, 0, 0} },
{"ret", 1, 0xc2, _, NoModrm|Data32, { Imm16, 0, 0} },
{"retw", 0, 0xc3, _, NoModrm|Data16, { 0, 0, 0} },
{"retw", 1, 0xc2, _, NoModrm|Data16, { Imm16, 0, 0} },
{"lret", 0, 0xcb, _, NoModrm|Data32, { 0, 0, 0} },
{"lret", 1, 0xca, _, NoModrm|Data32, { Imm16, 0, 0} },
{"lretw", 0, 0xcb, _, NoModrm|Data16, { 0, 0, 0} },
{"lretw", 1, 0xca, _, NoModrm|Data16, { Imm16, 0, 0} },
{"enter", 2, 0xc8, _, NoModrm|Data32, { Imm16, Imm8, 0} },
{"leave", 0, 0xc9, _, NoModrm|Data32, { 0, 0, 0} },
{"enterw", 2, 0xc8, _, NoModrm|Data16, { Imm16, Imm8, 0} },
{"leavew", 0, 0xc9, _, NoModrm|Data16, { 0, 0, 0} },

/* conditional jumps */
{"jo", 1, 0x70, _, Jump, { Disp, 0, 0} },

{"jno", 1, 0x71, _, Jump, { Disp, 0, 0} },

{"jb", 1, 0x72, _, Jump, { Disp, 0, 0} },
{"jc", 1, 0x72, _, Jump, { Disp, 0, 0} },
{"jnae", 1, 0x72, _, Jump, { Disp, 0, 0} },

{"jnb", 1, 0x73, _, Jump, { Disp, 0, 0} },
{"jnc", 1, 0x73, _, Jump, { Disp, 0, 0} },
{"jae", 1, 0x73, _, Jump, { Disp, 0, 0} },

{"je", 1, 0x74, _, Jump, { Disp, 0, 0} },
{"jz", 1, 0x74, _, Jump, { Disp, 0, 0} },

{"jne", 1, 0x75, _, Jump, { Disp, 0, 0} },
{"jnz", 1, 0x75, _, Jump, { Disp, 0, 0} },

{"jbe", 1, 0x76, _, Jump, { Disp, 0, 0} },
{"jna", 1, 0x76, _, Jump, { Disp, 0, 0} },

{"jnbe", 1, 0x77, _, Jump, { Disp, 0, 0} },
{"ja", 1, 0x77, _, Jump, { Disp, 0, 0} },

{"js", 1, 0x78, _, Jump, { Disp, 0, 0} },

{"jns", 1, 0x79, _, Jump, { Disp, 0, 0} },

{"jp", 1, 0x7a, _, Jump, { Disp, 0, 0} },
{"jpe", 1, 0x7a, _, Jump, { Disp, 0, 0} },

{"jnp", 1, 0x7b, _, Jump, { Disp, 0, 0} },
{"jpo", 1, 0x7b, _, Jump, { Disp, 0, 0} },

{"jl", 1, 0x7c, _, Jump, { Disp, 0, 0} },
{"jnge", 1, 0x7c, _, Jump, { Disp, 0, 0} },

{"jnl", 1, 0x7d, _, Jump, { Disp, 0, 0} },
{"jge", 1, 0x7d, _, Jump, { Disp, 0, 0} },

{"jle", 1, 0x7e, _, Jump, { Disp, 0, 0} },
{"jng", 1, 0x7e, _, Jump, { Disp, 0, 0} },

{"jnle", 1, 0x7f, _, Jump, { Disp, 0, 0} },
{"jg", 1, 0x7f, _, Jump, { Disp, 0, 0} },

#define IS_JUMP_ON_CX_ZERO(o) \
  (o == 0xe3)

/* jcxz vs. jecxz is chosen on the basis of the address size prefix.  */
{"jcxz", 1, 0xe3, _, JumpByte|Data16, { Disp, 0, 0} },
{"jecxz", 1, 0xe3, _, JumpByte|Data32, { Disp, 0, 0} },

#define IS_LOOP_ECX_TIMES(o) \
  (o == 0xe2 || o == 0xe1 || o == 0xe0)

{"loop", 1, 0xe2, _, JumpByte, { Disp, 0, 0} },

{"loopz", 1, 0xe1, _, JumpByte, { Disp, 0, 0} },
{"loope", 1, 0xe1, _, JumpByte, { Disp, 0, 0} },

{"loopnz", 1, 0xe0, _, JumpByte, { Disp, 0, 0} },
{"loopne", 1, 0xe0, _, JumpByte, { Disp, 0, 0} },

/* set byte on flag instructions */
{"seto", 1, 0x0f90, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setno", 1, 0x0f91, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setb", 1, 0x0f92, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setc", 1, 0x0f92, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setnae", 1, 0x0f92, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setnb", 1, 0x0f93, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setnc", 1, 0x0f93, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setae", 1, 0x0f93, 0, Modrm, { Reg8|Mem, 0, 0} },

{"sete", 1, 0x0f94, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setz", 1, 0x0f94, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setne", 1, 0x0f95, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setnz", 1, 0x0f95, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setbe", 1, 0x0f96, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setna", 1, 0x0f96, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setnbe", 1, 0x0f97, 0, Modrm, { Reg8|Mem, 0, 0} },
{"seta", 1, 0x0f97, 0, Modrm, { Reg8|Mem, 0, 0} },

{"sets", 1, 0x0f98, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setns", 1, 0x0f99, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setp", 1, 0x0f9a, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setpe", 1, 0x0f9a, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setnp", 1, 0x0f9b, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setpo", 1, 0x0f9b, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setl", 1, 0x0f9c, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setnge", 1, 0x0f9c, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setnl", 1, 0x0f9d, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setge", 1, 0x0f9d, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setle", 1, 0x0f9e, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setng", 1, 0x0f9e, 0, Modrm, { Reg8|Mem, 0, 0} },

{"setnle", 1, 0x0f9f, 0, Modrm, { Reg8|Mem, 0, 0} },
{"setg", 1, 0x0f9f, 0, Modrm, { Reg8|Mem, 0, 0} },

#define IS_STRING_INSTRUCTION(o) \
  ((o) == 0xa6 || (o) == 0x6c || (o) == 0x6e || (o) == 0x6e || \
   (o) == 0xac || (o) == 0xa4 || (o) == 0xae || (o) == 0xaa || \
   (o) == 0xd7)

/* string manipulation */
{"cmps", 0, 0xa6, _, W|NoModrm, { 0, 0, 0} },
{"scmp", 0, 0xa6, _, W|NoModrm, { 0, 0, 0} },
{"ins", 0, 0x6c, _, W|NoModrm, { 0, 0, 0} },
{"outs", 0, 0x6e, _, W|NoModrm, { 0, 0, 0} },
{"lods", 0, 0xac, _, W|NoModrm, { 0, 0, 0} },
{"slod", 0, 0xac, _, W|NoModrm, { 0, 0, 0} },
{"movs", 0, 0xa4, _, W|NoModrm, { 0, 0, 0} },
{"smov", 0, 0xa4, _, W|NoModrm, { 0, 0, 0} },
{"scas", 0, 0xae, _, W|NoModrm, { 0, 0, 0} },
{"ssca", 0, 0xae, _, W|NoModrm, { 0, 0, 0} },
{"stos", 0, 0xaa, _, W|NoModrm, { 0, 0, 0} },
{"ssto", 0, 0xaa, _, W|NoModrm, { 0, 0, 0} },
{"xlat", 0, 0xd7, _, NoModrm, { 0, 0, 0} },

/* bit manipulation */
{"bsf", 2, 0x0fbc, _, Modrm|ReverseRegRegmem, { Reg|Mem, Reg, 0} },
{"bsr", 2, 0x0fbd, _, Modrm|ReverseRegRegmem, { Reg|Mem, Reg, 0} },
{"bt", 2, 0x0fa3, _, Modrm, { Reg, Reg|Mem, 0} },
{"bt", 2, 0x0fba, 4, Modrm, { Imm8, Reg|Mem, 0} },
{"btc", 2, 0x0fbb, _, Modrm, { Reg, Reg|Mem, 0} },
{"btc", 2, 0x0fba, 7, Modrm, { Imm8, Reg|Mem, 0} },
{"btr", 2, 0x0fb3, _, Modrm, { Reg, Reg|Mem, 0} },
{"btr", 2, 0x0fba, 6, Modrm, { Imm8, Reg|Mem, 0} },
{"bts", 2, 0x0fab, _, Modrm, { Reg, Reg|Mem, 0} },
{"bts", 2, 0x0fba, 5, Modrm, { Imm8, Reg|Mem, 0} },

/* interrupts & op. sys insns */
/* See gas/config/tc-i386.c for conversion of 'int $3' into the special
   int 3 insn. */
#define INT_OPCODE 0xcd
#define INT3_OPCODE 0xcc
{"int", 1, 0xcd, _, NoModrm, { Imm8, 0, 0} },
{"int3", 0, 0xcc, _, NoModrm, { 0, 0, 0} },
{"into", 0, 0xce, _, NoModrm, { 0, 0, 0} },
{"iret", 0, 0xcf, _, NoModrm|Data32, { 0, 0, 0} },
{"iretw", 0, 0xcf, _, NoModrm|Data16, { 0, 0, 0} },
/* i386sl, i486sl, later 486, and Pentium */
{"rsm", 0, 0x0faa, _, NoModrm,{ 0, 0, 0} },

{"boundl", 2, 0x62, _, Modrm|Data32, { Reg32, Mem, 0} },
{"boundw", 2, 0x62, _, Modrm|Data16, { Reg16, Mem, 0} },

{"hlt", 0, 0xf4, _, NoModrm, { 0, 0, 0} },
{"wait", 0, 0x9b, _, NoModrm, { 0, 0, 0} },
/* nop is actually 'xchgl %eax, %eax' */
{"nop", 0, 0x90, _, NoModrm, { 0, 0, 0} },

/* protection control */
{"arpl", 2, 0x63, _, Modrm, { Reg16, Reg16|Mem, 0} },
{"lar", 2, 0x0f02, _, Modrm|ReverseRegRegmem, { WordReg|Mem, WordReg, 0} },
{"lgdt", 1, 0x0f01, 2, Modrm, { Mem, 0, 0} },
{"lidt", 1, 0x0f01, 3, Modrm, { Mem, 0, 0} },
{"lldt", 1, 0x0f00, 2, Modrm, { WordReg|Mem, 0, 0} },
{"lmsw", 1, 0x0f01, 6, Modrm, { WordReg|Mem, 0, 0} },
{"lsl", 2, 0x0f03, _, Modrm|ReverseRegRegmem, { WordReg|Mem, WordReg, 0} },
{"ltr", 1, 0x0f00, 3, Modrm, { WordReg|Mem, 0, 0} },

{"sgdt", 1, 0x0f01, 0, Modrm, { Mem, 0, 0} },
{"sidt", 1, 0x0f01, 1, Modrm, { Mem, 0, 0} },
{"sldt", 1, 0x0f00, 0, Modrm, { WordReg|Mem, 0, 0} },
{"smsw", 1, 0x0f01, 4, Modrm, { WordReg|Mem, 0, 0} },
{"str", 1, 0x0f00, 1, Modrm, { Reg16|Mem, 0, 0} },

{"verr", 1, 0x0f00, 4, Modrm, { WordReg|Mem, 0, 0} },
{"verw", 1, 0x0f00, 5, Modrm, { WordReg|Mem, 0, 0} },

/* floating point instructions */

/* load */
{"fld", 1, 0xd9c0, _, ShortForm, { FloatReg, 0, 0} }, /* register */
{"flds", 1, 0xd9, 0, Modrm, { Mem, 0, 0} },		/* %st0 <-- mem float */
{"fldl", 1, 0xdd, 0, Modrm, { Mem, 0, 0} },		/* %st0 <-- mem double */
{"fldl", 1, 0xd9c0, _, ShortForm, { FloatReg, 0, 0} }, /* register */
{"fild", 1, 0xdf, 0, Modrm, { Mem, 0, 0} },		/* %st0 <-- mem word (16) */
{"fildl", 1, 0xdb, 0, Modrm, { Mem, 0, 0} },	/* %st0 <-- mem dword (32) */
{"fildq",1, 0xdf, 5, Modrm, { Mem, 0, 0} },		/* %st0 <-- mem qword (64) */
{"fildll",1, 0xdf, 5, Modrm, { Mem, 0, 0} },	/* %st0 <-- mem qword (64) */
{"fldt", 1, 0xdb, 5, Modrm, { Mem, 0, 0} },		/* %st0 <-- mem efloat */
{"fbld", 1, 0xdf, 4, Modrm, { Mem, 0, 0} },		/* %st0 <-- mem bcd */

/* store (no pop) */
{"fst", 1, 0xddd0, _, ShortForm, { FloatReg, 0, 0} }, /* register */
{"fsts", 1, 0xd9, 2, Modrm, { Mem, 0, 0} },		/* %st0 --> mem float */
{"fstl", 1, 0xdd, 2, Modrm, { Mem, 0, 0} },		/* %st0 --> mem double */
{"fstl", 1, 0xddd0, _, ShortForm, { FloatReg, 0, 0} }, /* register */
{"fist", 1, 0xdf, 2, Modrm, { Mem, 0, 0} },		/* %st0 --> mem word (16) */
{"fistl", 1, 0xdb, 2, Modrm, { Mem, 0, 0} },	/* %st0 --> mem dword (32) */

/* store (with pop) */
{"fstp", 1, 0xddd8, _, ShortForm, { FloatReg, 0, 0} }, /* register */
{"fstps", 1, 0xd9, 3, Modrm, { Mem, 0, 0} },	/* %st0 --> mem float */
{"fstpl", 1, 0xdd, 3, Modrm, { Mem, 0, 0} },	/* %st0 --> mem double */
{"fstpl", 1, 0xddd8, _, ShortForm, { FloatReg, 0, 0} }, /* register */
{"fistp", 1, 0xdf, 3, Modrm, { Mem, 0, 0} },	/* %st0 --> mem word (16) */
{"fistpl",1, 0xdb, 3, Modrm, { Mem, 0, 0} },	/* %st0 --> mem dword (32) */
{"fistpq",1, 0xdf, 7, Modrm, { Mem, 0, 0} },	/* %st0 --> mem qword (64) */
{"fistpll",1,0xdf, 7, Modrm, { Mem, 0, 0} },	/* %st0 --> mem qword (64) */
{"fstpt", 1, 0xdb, 7, Modrm, { Mem, 0, 0} },	/* %st0 --> mem efloat */
{"fbstp", 1, 0xdf, 6, Modrm, { Mem, 0, 0} },	/* %st0 --> mem bcd */

/* exchange %st<n> with %st0 */
{"fxch", 1, 0xd9c8, _, ShortForm, { FloatReg, 0, 0} },
{"fxch", 0, 0xd9c9, _, NoModrm, { 0, 0, 0} }, /* alias for fxch %st, %st(1) */

/* comparison (without pop) */
{"fcom", 1, 0xd8d0, _, ShortForm, { FloatReg, 0, 0} },
{"fcoms", 1, 0xd8, 2, Modrm, { Mem, 0, 0} },	/* compare %st0, mem float  */
{"ficoml", 1, 0xda, 2, Modrm, { Mem, 0, 0} },	/* compare %st0, mem dword  */
{"fcoml", 1, 0xdc, 2, Modrm, { Mem, 0, 0} },	/* compare %st0, mem double  */
{"fcoml", 1, 0xd8d0, _, ShortForm, { FloatReg, 0, 0} },
{"ficoms", 1, 0xde, 2, Modrm, { Mem, 0, 0} },	/* compare %st0, mem word */

/* comparison (with pop) */
{"fcomp", 1, 0xd8d8, _, ShortForm, { FloatReg, 0, 0} },
{"fcomp", 0, 0xd8d9, _, NoModrm, {0, 0, 0} },   /* fcomp %st, %st(1) */
{"fcomps", 1, 0xd8, 3, Modrm, { Mem, 0, 0} },	/* compare %st0, mem float  */
{"ficompl", 1, 0xda, 3, Modrm, { Mem, 0, 0} },	/* compare %st0, mem dword  */
{"fcompl", 1, 0xdc, 3, Modrm, { Mem, 0, 0} },	/* compare %st0, mem double  */
{"fcompl", 1, 0xd8d8, _, ShortForm, { FloatReg, 0, 0} },
{"ficomps", 1, 0xde, 3, Modrm, { Mem, 0, 0} },	/* compare %st0, mem word */
{"fcompp", 0, 0xded9, _, NoModrm, { 0, 0, 0} },	/* compare %st0, %st1 & pop 2 */

/* unordered comparison (with pop) */
{"fucom", 1, 0xdde0, _, ShortForm, { FloatReg, 0, 0} },
{"fucomp", 1, 0xdde8, _, ShortForm, { FloatReg, 0, 0} },
{"fucompp", 0, 0xdae9, _, NoModrm, { 0, 0, 0} }, /* ucompare %st0, %st1 & pop twice */

{"ftst", 0, 0xd9e4, _, NoModrm, { 0, 0, 0} },	/* test %st0 */
{"fxam", 0, 0xd9e5, _, NoModrm, { 0, 0, 0} },	/* examine %st0 */

/* load constants into %st0 */
{"fld1", 0, 0xd9e8, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- 1.0 */
{"fldl2t", 0, 0xd9e9, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- log2(10) */
{"fldl2e", 0, 0xd9ea, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- log2(e) */
{"fldpi", 0, 0xd9eb, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- pi */
{"fldlg2", 0, 0xd9ec, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- log10(2) */
{"fldln2", 0, 0xd9ed, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- ln(2) */
{"fldz", 0, 0xd9ee, _, NoModrm, { 0, 0, 0} },	/* %st0 <-- 0.0 */

/* arithmetic */

/* add */
{"fadd", 1, 0xd8c0, _, ShortForm, { FloatReg, 0, 0} },
{"fadd", 2, 0xd8c0, _, ShortForm|FloatD, { FloatReg, FloatAcc, 0} },
{"fadd", 0, 0xdcc1, _, NoModrm, { 0, 0, 0} }, /* alias for fadd %st, %st(1) */
{"faddp", 1, 0xdec0, _, ShortForm, { FloatReg, 0, 0} },
{"faddp", 2, 0xdec0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"faddp", 2, 0xdec0, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"faddp", 0, 0xdec1, _, NoModrm, { 0, 0, 0} }, /* alias for faddp %st, %st(1) */
{"fadds", 1, 0xd8, 0, Modrm, { Mem, 0, 0} },
{"fiaddl", 1, 0xda, 0, Modrm, { Mem, 0, 0} },
{"faddl", 1, 0xdc, 0, Modrm, { Mem, 0, 0} },
{"fiadds", 1, 0xde, 0, Modrm, { Mem, 0, 0} },

/* sub */
/* Note:  intel has decided that certain of these operations are reversed
   in assembler syntax. */
{"fsub", 1, 0xd8e0, _, ShortForm, { FloatReg, 0, 0} },
{"fsub", 2, 0xd8e0, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fsub", 2, 0xdce8, _, ShortForm, { FloatAcc, FloatReg, 0} },
#else
{"fsub", 2, 0xdce0, _, ShortForm, { FloatAcc, FloatReg, 0} },
#endif
{"fsub", 0, 0xdce1, _, NoModrm, { 0, 0, 0} },
{"fsubp", 1, 0xdee8, _, ShortForm, { FloatReg, 0, 0} },
{"fsubp", 2, 0xdee8, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fsubp", 2, 0xdee8, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fsubp", 0, 0xdee9, _, NoModrm, { 0, 0, 0} },
#else
{"fsubp", 2, 0xdee0, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fsubp", 0, 0xdee1, _, NoModrm, { 0, 0, 0} },
#endif
{"fsubs", 1, 0xd8, 4, Modrm, { Mem, 0, 0} },
{"fisubl", 1, 0xda, 4, Modrm, { Mem, 0, 0} },
{"fsubl", 1, 0xdc, 4, Modrm, { Mem, 0, 0} },
{"fisubs", 1, 0xde, 4, Modrm, { Mem, 0, 0} },

/* sub reverse */
{"fsubr", 1, 0xd8e8, _, ShortForm, { FloatReg, 0, 0} },
{"fsubr", 2, 0xd8e8, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fsubr", 2, 0xdce0, _, ShortForm, { FloatAcc, FloatReg, 0} },
#else
{"fsubr", 2, 0xdce8, _, ShortForm, { FloatAcc, FloatReg, 0} },
#endif
{"fsubr", 0, 0xdce9, _, NoModrm, { 0, 0, 0} },
{"fsubrp", 1, 0xdee0, _, ShortForm, { FloatReg, 0, 0} },
{"fsubrp", 2, 0xdee0, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fsubrp", 2, 0xdee0, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fsubrp", 0, 0xdee1, _, NoModrm, { 0, 0, 0} },
#else
{"fsubrp", 2, 0xdee8, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fsubrp", 0, 0xdee9, _, NoModrm, { 0, 0, 0} },
#endif
{"fsubrs", 1, 0xd8, 5, Modrm, { Mem, 0, 0} },
{"fisubrl", 1, 0xda, 5, Modrm, { Mem, 0, 0} },
{"fsubrl", 1, 0xdc, 5, Modrm, { Mem, 0, 0} },
{"fisubrs", 1, 0xde, 5, Modrm, { Mem, 0, 0} },

/* mul */
{"fmul", 1, 0xd8c8, _, ShortForm, { FloatReg, 0, 0} },
{"fmul", 2, 0xd8c8, _, ShortForm|FloatD, { FloatReg, FloatAcc, 0} },
{"fmul", 0, 0xdcc9, _, NoModrm, { 0, 0, 0} },
{"fmulp", 1, 0xdec8, _, ShortForm, { FloatReg, 0, 0} },
{"fmulp", 2, 0xdec8, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fmulp", 2, 0xdec8, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fmulp", 0, 0xdec9, _, NoModrm, { 0, 0, 0} },
{"fmuls", 1, 0xd8, 1, Modrm, { Mem, 0, 0} },
{"fimull", 1, 0xda, 1, Modrm, { Mem, 0, 0} },
{"fmull", 1, 0xdc, 1, Modrm, { Mem, 0, 0} },
{"fimuls", 1, 0xde, 1, Modrm, { Mem, 0, 0} },

/* div */
/* Note:  intel has decided that certain of these operations are reversed
   in assembler syntax. */
{"fdiv", 1, 0xd8f0, _, ShortForm, { FloatReg, 0, 0} },
{"fdiv", 2, 0xd8f0, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fdiv", 2, 0xdcf8, _, ShortForm, { FloatAcc, FloatReg, 0} },
#else
{"fdiv", 2, 0xdcf0, _, ShortForm, { FloatAcc, FloatReg, 0} },
#endif
{"fdiv", 0, 0xdcf1, _, NoModrm, { 0, 0, 0} },
{"fdivp", 1, 0xdef8, _, ShortForm, { FloatReg, 0, 0} },
{"fdivp", 2, 0xdef8, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fdivp", 2, 0xdef8, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fdivp", 0, 0xdef9, _, NoModrm, { 0, 0, 0} },
#else
{"fdivp", 2, 0xdef0, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fdivp", 0, 0xdef1, _, NoModrm, { 0, 0, 0} },
#endif
{"fdivs", 1, 0xd8, 6, Modrm, { Mem, 0, 0} },
{"fidivl", 1, 0xda, 6, Modrm, { Mem, 0, 0} },
{"fdivl", 1, 0xdc, 6, Modrm, { Mem, 0, 0} },
{"fidivs", 1, 0xde, 6, Modrm, { Mem, 0, 0} },

/* div reverse */
{"fdivr", 1, 0xd8f8, _, ShortForm, { FloatReg, 0, 0} },
{"fdivr", 2, 0xd8f8, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fdivr", 2, 0xdcf0, _, ShortForm, { FloatAcc, FloatReg, 0} },
#else
{"fdivr", 2, 0xdcf8, _, ShortForm, { FloatAcc, FloatReg, 0} },
#endif
{"fdivr", 0, 0xdcf9, _, NoModrm, { 0, 0, 0} },
{"fdivrp", 1, 0xdef0, _, ShortForm, { FloatReg, 0, 0} },
{"fdivrp", 2, 0xdef0, _, ShortForm, { FloatReg, FloatAcc, 0} },
#ifdef NON_BROKEN_OPCODES
{"fdivrp", 2, 0xdef0, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fdivrp", 0, 0xdef1, _, NoModrm, { 0, 0, 0} },
#else
{"fdivrp", 2, 0xdef8, _, ShortForm, { FloatAcc, FloatReg, 0} },
{"fdivrp", 0, 0xdef9, _, NoModrm, { 0, 0, 0} },
#endif
{"fdivrs", 1, 0xd8, 7, Modrm, { Mem, 0, 0} },
{"fidivrl", 1, 0xda, 7, Modrm, { Mem, 0, 0} },
{"fdivrl", 1, 0xdc, 7, Modrm, { Mem, 0, 0} },
{"fidivrs", 1, 0xde, 7, Modrm, { Mem, 0, 0} },

{"f2xm1", 0,   0xd9f0, _, NoModrm, { 0, 0, 0} },
{"fyl2x", 0,   0xd9f1, _, NoModrm, { 0, 0, 0} },
{"fptan", 0,   0xd9f2, _, NoModrm, { 0, 0, 0} },
{"fpatan", 0,  0xd9f3, _, NoModrm, { 0, 0, 0} },
{"fxtract", 0, 0xd9f4, _, NoModrm, { 0, 0, 0} },
{"fprem1", 0,  0xd9f5, _, NoModrm, { 0, 0, 0} },
{"fdecstp", 0,  0xd9f6, _, NoModrm, { 0, 0, 0} },
{"fincstp", 0,  0xd9f7, _, NoModrm, { 0, 0, 0} },
{"fprem", 0,   0xd9f8, _, NoModrm, { 0, 0, 0} },
{"fyl2xp1", 0, 0xd9f9, _, NoModrm, { 0, 0, 0} },
{"fsqrt", 0,   0xd9fa, _, NoModrm, { 0, 0, 0} },
{"fsincos", 0, 0xd9fb, _, NoModrm, { 0, 0, 0} },
{"frndint", 0, 0xd9fc, _, NoModrm, { 0, 0, 0} },
{"fscale", 0,  0xd9fd, _, NoModrm, { 0, 0, 0} },
{"fsin", 0,    0xd9fe, _, NoModrm, { 0, 0, 0} },
{"fcos", 0,    0xd9ff, _, NoModrm, { 0, 0, 0} },

{"fchs", 0, 0xd9e0, _, NoModrm, { 0, 0, 0} },
{"fabs", 0, 0xd9e1, _, NoModrm, { 0, 0, 0} },

/* processor control */
{"fninit", 0, 0xdbe3, _, NoModrm, { 0, 0, 0} },
{"finit", 0, 0x9bdbe3, _, NoModrm, { 0, 0, 0} },
{"fldcw", 1, 0xd9, 5, Modrm, { Mem, 0, 0} },
{"fnstcw", 1, 0xd9, 7, Modrm, { Mem, 0, 0} },
{"fstcw", 1, 0x9bd9, 7, Modrm, { Mem, 0, 0} },
{"fnstsw", 1, 0xdfe0, _, NoModrm, { Acc, 0, 0} },
{"fnstsw", 1, 0xdd, 7, Modrm, { Mem, 0, 0} },
{"fnstsw", 0, 0xdfe0, _, NoModrm, { 0, 0, 0} },
{"fstsw", 1, 0x9bdfe0, _, NoModrm, { Acc, 0, 0} },
{"fstsw", 1, 0x9bdd, 7, Modrm, { Mem, 0, 0} },
{"fstsw", 0, 0x9bdfe0, _, NoModrm, { 0, 0, 0} },
{"fnclex", 0, 0xdbe2, _, NoModrm, { 0, 0, 0} },
{"fclex", 0, 0x9bdbe2, _, NoModrm, { 0, 0, 0} },
/*
 We ignore the short format (287) versions of fstenv/fldenv & fsave/frstor
 instructions;  i'm not sure how to add them or how they are different.
 My 386/387 book offers no details about this.
*/
{"fnstenv", 1, 0xd9, 6, Modrm, { Mem, 0, 0} },
{"fstenv", 1, 0x9bd9, 6, Modrm, { Mem, 0, 0} },
{"fldenv", 1, 0xd9, 4, Modrm, { Mem, 0, 0} },
{"fnsave", 1, 0xdd, 6, Modrm, { Mem, 0, 0} },
{"fsave", 1, 0x9bdd, 6, Modrm, { Mem, 0, 0} },
{"frstor", 1, 0xdd, 4, Modrm, { Mem, 0, 0} },

{"ffree", 1, 0xddc0, _, ShortForm, { FloatReg, 0, 0} },
/* P6:free st(i), pop st */
{"ffreep", 1, 0xdfc0, _, ShortForm, { FloatReg, 0, 0} },
{"fnop", 0, 0xd9d0, _, NoModrm, { 0, 0, 0} },
{"fwait", 0, 0x9b, _, NoModrm, { 0, 0, 0} },

/*
  opcode prefixes; we allow them as seperate insns too
  (see prefix table below)
*/
{"aword", 0, 0x67, _, NoModrm, { 0, 0, 0} },
{"addr16", 0, 0x67, _, NoModrm, { 0, 0, 0} },
{"word", 0, 0x66, _, NoModrm, { 0, 0, 0} },
{"data16", 0, 0x66, _, NoModrm, { 0, 0, 0} },
{"lock", 0, 0xf0, _, NoModrm, { 0, 0, 0} },
{"cs", 0, 0x2e, _, NoModrm, { 0, 0, 0} },
{"ds", 0, 0x3e, _, NoModrm, { 0, 0, 0} },
{"es", 0, 0x26, _, NoModrm, { 0, 0, 0} },
{"fs", 0, 0x64, _, NoModrm, { 0, 0, 0} },
{"gs", 0, 0x65, _, NoModrm, { 0, 0, 0} },
{"ss", 0, 0x36, _, NoModrm, { 0, 0, 0} },
{"rep", 0, 0xf3, _, NoModrm, { 0, 0, 0} },
{"repe", 0, 0xf3, _, NoModrm, { 0, 0, 0} },
{"repz", 0, 0xf3, _, NoModrm, { 0, 0, 0} },
{"repne", 0, 0xf2, _, NoModrm, { 0, 0, 0} },
{"repnz", 0, 0xf2, _, NoModrm, { 0, 0, 0} },

/* 486 extensions */

{"bswap", 1, 0x0fc8, _, ShortForm, { Reg32,0,0 } },
{"xadd", 2, 0x0fc0, _, W|Modrm, { Reg, Reg|Mem, 0 } },
{"cmpxchg", 2, 0x0fb0, _, W|Modrm, { Reg, Reg|Mem, 0 } },
{"invd", 0, 0x0f08, _, NoModrm, { 0, 0, 0} },
{"wbinvd", 0, 0x0f09, _, NoModrm, { 0, 0, 0} },
{"invlpg", 1, 0x0f01, 7, Modrm, { Mem, 0, 0} },

/* 586 and late 486 extensions */
{"cpuid", 0, 0x0fa2, _, NoModrm, { 0, 0, 0} },

/* Pentium extensions */
{"wrmsr", 0, 0x0f30, _, NoModrm, { 0, 0, 0} },
{"rdtsc", 0, 0x0f31, _, NoModrm, { 0, 0, 0} },
{"rdmsr", 0, 0x0f32, _, NoModrm, { 0, 0, 0} },
{"cmpxchg8b", 1, 0x0fc7, 1, Modrm, { Mem, 0, 0} },

/* Pentium Pro extensions */
{"rdpmc", 0, 0x0f33, _, NoModrm, { 0, 0, 0} },

{"ud2", 0, 0x0f0b, _, NoModrm, {0, 0, 0} }, /* official undefined instr. */

{"cmovo",  2, 0x0f40, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovno", 2, 0x0f41, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovb",  2, 0x0f42, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovae", 2, 0x0f43, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmove",  2, 0x0f44, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovne", 2, 0x0f45, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovbe", 2, 0x0f46, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmova",  2, 0x0f47, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovs",  2, 0x0f48, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovns", 2, 0x0f49, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovp",  2, 0x0f4a, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovnp", 2, 0x0f4b, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovl",  2, 0x0f4c, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovge", 2, 0x0f4d, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovle", 2, 0x0f4e, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },
{"cmovg",  2, 0x0f4f, _, Modrm|ReverseRegRegmem, { WordReg|WordMem, WordReg, 0} },

{"fcmovb", 2, 0xdac0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmove", 2, 0xdac8, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmovbe",2, 0xdad0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmovu", 2, 0xdad8, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmovnb", 2, 0xdbc0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmovne", 2, 0xdbc8, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmovnbe",2, 0xdbd0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcmovnu", 2, 0xdbd8, _, ShortForm, { FloatReg, FloatAcc, 0} },

{"fcomi",  2, 0xdbf0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fucomi", 2, 0xdbe8, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fcomip", 2, 0xdff0, _, ShortForm, { FloatReg, FloatAcc, 0} },
{"fucomip",2, 0xdfe8, _, ShortForm, { FloatReg, FloatAcc, 0} },

/* MMX instructions.  */

{"emms",      0, 0x0f77, _, NoModrm, { 0, 0, 0 } },
{"movd",      2, 0x0f6e, _, Modrm, { Reg32|WordMem, RegMMX, 0 } },
{"movd",      2, 0x0f7e, _, Modrm, { RegMMX, Reg32|WordMem, 0 } },
{"movq",      2, 0x0f6f, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"movq",      2, 0x0f7f, _, Modrm, { RegMMX, RegMMX|WordMem, 0 } },
{"packssdw",  2, 0x0f6b, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"packsswb",  2, 0x0f63, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"packuswb",  2, 0x0f67, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddb",     2, 0x0ffc, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddw",     2, 0x0ffd, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddd",     2, 0x0ffe, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddsb",    2, 0x0fec, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddsw",    2, 0x0fed, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddusb",   2, 0x0fdc, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"paddusw",   2, 0x0fdd, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pand",      2, 0x0fdb, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pandn",     2, 0x0fdf, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pcmpeqb",   2, 0x0f74, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pcmpeqw",   2, 0x0f75, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pcmpeqd",   2, 0x0f76, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pcmpgtb",   2, 0x0f64, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pcmpgtw",   2, 0x0f65, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pcmpgtd",   2, 0x0f66, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pmaddwd",   2, 0x0ff5, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pmulhw",    2, 0x0fe5, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pmullw",    2, 0x0fd5, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"por",       2, 0x0feb, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psllw",     2, 0x0ff1, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psllw",     2, 0x0f71, 6, Modrm, { Imm8, RegMMX, 0 } },
{"pslld",     2, 0x0ff2, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pslld",     2, 0x0f72, 6, Modrm, { Imm8, RegMMX, 0 } },
{"psllq",     2, 0x0ff3, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psllq",     2, 0x0f73, 6, Modrm, { Imm8, RegMMX, 0 } },
{"psraw",     2, 0x0fe1, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psraw",     2, 0x0f71, 4, Modrm, { Imm8, RegMMX, 0 } },
{"psrad",     2, 0x0fe2, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psrad",     2, 0x0f72, 4, Modrm, { Imm8, RegMMX, 0 } },
{"psrlw",     2, 0x0fd1, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psrlw",     2, 0x0f71, 2, Modrm, { Imm8, RegMMX, 0 } },
{"psrld",     2, 0x0fd2, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psrld",     2, 0x0f72, 2, Modrm, { Imm8, RegMMX, 0 } },
{"psrlq",     2, 0x0fd3, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psrlq",     2, 0x0f73, 2, Modrm, { Imm8, RegMMX, 0 } },
{"psubb",     2, 0x0ff8, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psubw",     2, 0x0ff9, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psubd",     2, 0x0ffa, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psubsb",    2, 0x0fe8, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psubsw",    2, 0x0fe9, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psubusb",   2, 0x0fd8, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"psubusw",   2, 0x0fd9, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"punpckhbw", 2, 0x0f68, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"punpckhwd", 2, 0x0f69, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"punpckhdq", 2, 0x0f6a, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"punpcklbw", 2, 0x0f60, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"punpcklwd", 2, 0x0f61, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"punpckldq", 2, 0x0f62, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },
{"pxor",      2, 0x0fef, _, Modrm, { RegMMX|WordMem, RegMMX, 0 } },

{"", 0, 0, 0, 0, { 0, 0, 0} }	/* sentinel */
};
#undef _

static const template *const i386_optab_end
  = i386_optab + sizeof (i386_optab)/sizeof(i386_optab[0]);

/* 386 register table */

static const reg_entry i386_regtab[] = {
  /* 8 bit regs */
  {"al", Reg8|Acc, 0}, {"cl", Reg8|ShiftCount, 1}, {"dl", Reg8, 2},
  {"bl", Reg8, 3},
  {"ah", Reg8, 4}, {"ch", Reg8, 5}, {"dh", Reg8, 6}, {"bh", Reg8, 7},
  /* 16 bit regs */
  {"ax", Reg16|Acc, 0}, {"cx", Reg16, 1}, {"dx", Reg16|InOutPortReg, 2}, {"bx", Reg16, 3},
  {"sp", Reg16, 4}, {"bp", Reg16, 5}, {"si", Reg16, 6}, {"di", Reg16, 7},
  /* 32 bit regs */
  {"eax", Reg32|Acc, 0}, {"ecx", Reg32, 1}, {"edx", Reg32, 2}, {"ebx", Reg32, 3},
  {"esp", Reg32, 4}, {"ebp", Reg32, 5}, {"esi", Reg32, 6}, {"edi", Reg32, 7},
  /* segment registers */
  {"es", SReg2, 0}, {"cs", SReg2, 1}, {"ss", SReg2, 2},
  {"ds", SReg2, 3}, {"fs", SReg3, 4}, {"gs", SReg3, 5},
  /* control registers */
  {"cr0", Control, 0},   {"cr2", Control, 2},   {"cr3", Control, 3},
  {"cr4", Control, 4},
  /* debug registers */
  {"db0", Debug, 0},   {"db1", Debug, 1},   {"db2", Debug, 2},
  {"db3", Debug, 3},   {"db6", Debug, 6},   {"db7", Debug, 7},
  {"dr0", Debug, 0},   {"dr1", Debug, 1},   {"dr2", Debug, 2},
  {"dr3", Debug, 3},   {"dr6", Debug, 6},   {"dr7", Debug, 7},
  /* test registers */
  {"tr3", Test, 3}, {"tr4", Test, 4}, {"tr5", Test, 5},
  {"tr6", Test, 6}, {"tr7", Test, 7},
  /* float registers */
  {"st(0)", FloatReg|FloatAcc, 0},
  {"st", FloatReg|FloatAcc, 0},
  {"st(1)", FloatReg, 1}, {"st(2)", FloatReg, 2},
  {"st(3)", FloatReg, 3}, {"st(4)", FloatReg, 4}, {"st(5)", FloatReg, 5},
  {"st(6)", FloatReg, 6}, {"st(7)", FloatReg, 7},
  {"mm0", RegMMX, 0}, {"mm1", RegMMX, 1}, {"mm2", RegMMX, 2},
  {"mm3", RegMMX, 3}, {"mm4", RegMMX, 4}, {"mm5", RegMMX, 5},
  {"mm6", RegMMX, 6}, {"mm7", RegMMX, 7}
};

#define MAX_REG_NAME_SIZE 8	/* for parsing register names from input */

static const reg_entry *const i386_regtab_end
  = i386_regtab + sizeof(i386_regtab)/sizeof(i386_regtab[0]);

/* segment stuff */
static const seg_entry cs = { "cs", 0x2e };
static const seg_entry ds = { "ds", 0x3e };
static const seg_entry ss = { "ss", 0x36 };
static const seg_entry es = { "es", 0x26 };
static const seg_entry fs = { "fs", 0x64 };
static const seg_entry gs = { "gs", 0x65 };
static const seg_entry null = { "", 0x0 };

/*
  This table is used to store the default segment register implied by all
  possible memory addressing modes.
  It is indexed by the mode & modrm entries of the modrm byte as follows:
      index = (mode<<3) | modrm;
*/
static const seg_entry *const one_byte_segment_defaults[] = {
  /* mode 0 */
  &ds, &ds, &ds, &ds, &null, &ds, &ds, &ds,
  /* mode 1 */
  &ds, &ds, &ds, &ds, &null, &ss, &ds, &ds,
  /* mode 2 */
  &ds, &ds, &ds, &ds, &null, &ss, &ds, &ds,
  /* mode 3 --- not a memory reference; never referenced */
};

static const seg_entry *const two_byte_segment_defaults[] = {
  /* mode 0 */
  &ds, &ds, &ds, &ds, &ss, &ds, &ds, &ds,
  /* mode 1 */
  &ds, &ds, &ds, &ds, &ss, &ds, &ds, &ds,
  /* mode 2 */
  &ds, &ds, &ds, &ds, &ss, &ds, &ds, &ds,
  /* mode 3 --- not a memory reference; never referenced */
};

static const prefix_entry i386_prefixtab[] = {
#define ADDR_PREFIX_OPCODE 0x67
  { "addr16", 0x67 },		/* address size prefix ==> 16bit addressing
				 * (How is this useful?) */
#define WORD_PREFIX_OPCODE 0x66
  { "data16", 0x66 },		/* operand size prefix */
  { "lock", 0xf0 },		/* bus lock prefix */
  { "wait", 0x9b },		/* wait for coprocessor */
  { "cs", 0x2e }, { "ds", 0x3e }, /* segment overrides ... */
  { "es", 0x26 }, { "fs", 0x64 },
  { "gs", 0x65 }, { "ss", 0x36 },
/* REPE & REPNE used to detect rep/repne with a non-string instruction */
#define REPNE 0xf2
#define REPE  0xf3
  { "rep", 0xf3 }, 		/* repeat string instructions */
  { "repe", 0xf3 },  { "repz", 0xf3 },
  { "repne", 0xf2 }, { "repnz", 0xf2 }
};

static const prefix_entry *const i386_prefixtab_end
  = i386_prefixtab + sizeof(i386_prefixtab)/sizeof(i386_prefixtab[0]);

/* end of i386-opcode.h */