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x86_microcode/80386/decode2.txt
T
Andrew Jenner 79596c4c8b Initial 80386 microcode commit.
2026-05-23 11:01:52 +01:00

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00: alu rm,r excluding CMP
001D
001D
001D
001D
001D
001D
001D
001D
01:
0
0
0
0
0
0
0
0
02:
904A
904A
904A
904A
904A
904A
904A
904A
03:
0
0
0
0
0
0
0
0
04:
001D alu r,rm excluding CMP
001D
001D
001D
001D
001D
001D
001D
05:
0
0
0
0
0
0
0
0
06:
1027
1027
1027
1027
1027
1027
1027
1027
07:
0
0
0
0
0
0
0
0
08:
0 unused?
0
0
0
0
0
0
0
09:
0
0
0
0
0
0
0
0
0A:
0
0
0
0
0
0
0
0
0B:
0
0
0
0
0
0
0
0
0C:
0 IMUL rm,rmv
0
0
0
0
0
0
0
0D:
01B3
01B3
01B3
01B3
01B3
01B3
01B3
01B3
0E:
0
0
0
0
0
0
0
0
0F:
11BD
11BD
11BD
11BD
11BD
11BD
11BD
11BD
10:
001F CMP rm,r
001F
001F
001F
001F
001F
001F
001F
11:
0
0
0
0
0
0
0
0
12:
1035
1035
1035
1035
1035
1035
1035
1035
13:
0
0
0
0
0
0
0
0
14:
001F CMP r,rm
001F
001F
001F
001F
001F
001F
001F
15:
0
0
0
0
0
0
0
0
16:
102C
102C
102C
102C
102C
102C
102C
102C
17:
0
0
0
0
0
0
0
0
18: alu rm,i
0023
0023
0023
0023
0023
0023
0023
0025
19:
0
0
0
0
0
0
0
0
1A:
9039
9039
9039
9039
9039
9039
9039
1031
1B:
0
0
0
0
0
0
0
0
1C:
001F TEST rm,r
001F
001F
001F
001F
001F
001F
001F
1D:
0
0
0
0
0
0
0
0
1E:
1035
1035
1035
1035
1035
1035
1035
1035
1F:
0
0
0
0
0
0
0
0
20:
00B6 XCHG rm,r
00B6
00B6
00B6
00B6
00B6
00B6
00B6
21:
0
0
0
0
0
0
0
0
22:
90B1
90B1
90B1
90B1
90B1
90B1
90B1
90B1
23:
0
0
0
0
0
0
0
0
24:
01C4 IMUL rv,rmv,i
01C4
01C4
01C4
01C4
01C4
01C4
01C4
25:
0
0
0
0
0
0
0
0
26:
11C1
11C1
11C1
11C1
11C1
11C1
11C1
11C1
27:
0
0
0
0
0
0
0
0
28:
0003 MOV rm,r
0003
0003
0003
0003
0003
0003
0003
29:
0003
0003
0003
0003
0003
0003
0003
0003
2A:
1013
1013
1013
1013
1013
1013
1013
1013
2B:
1013
1013
1013
1013
1013
1013
1013
1013
2C:
0003 MOV r,rm
0003
0003
0003
0003
0003
0003
0003
2D:
0003
0003
0003
0003
0003
0003
0003
0003
2E:
1019
1019
1019
1019
1019
1019
1019
1019
2F:
1019
1019
1019
1019
1019
1019
1019
1019
30: MOV segreg,rmw real
0009 MOV ES,rmw real
082B illegal MOV CS,rmw real
0009 MOV SS,rmw real
0009 MOV DS,rmw real
0009 MOV FS,rmw real
0009 MOV GS,rmw real
082B illegal
082B illegal
31:
0
0
0
0
0
0
0
0
32:
100F MOV ES,rmw
082B illegal MOV CS,rmw
100B MOV SS,rmw
100F MOV DS,rmw
100F MOV FS,rmw
100F MOV GS,rmw
082B illegal
082B illegal
33:
0
0
0
0
0
0
0
0
34: MOV(ZX) rmv,segreg
0007 MOV rmw,ES
0007 MOV rmw,CS
0007 MOV rmw,SS
0007 MOV rmw,DS
0007 MOV rmw,FS
0007 MOV rmw,GS
082B illegal
082B illegal
35:
0
0
0
0
0
0
0
0
36:
1017 MOV rmw,ES
1017 MOV rmw,CS
1017 MOV rmw,SS
1017 MOV rmw,DS
1017 MOV rmw,FS
1017 MOV rmw,GS
082B illegal
082B illegal
37:
0
0
0
0
0
0
0
0
38: MOV segreg,rmw protected
0580 MOV ES,rmw protected
082B illegal MOV CS,rmw protected
0585 MOV SS,rmw protected
0580 MOV DS,rmw protected
0580 MOV FS,rmw protected
0580 MOV GS,rmw protected
082B illegal
082B illegal
39:
0
0
0
0
0
0
0
0
3A:
100F MOV ES,rmw protected
082B illegal MOV CS,rmw protected
100B MOV SS,rmw protected
100F MOV DS,rmw protected
100F MOV FS,rmw protected
100F MOV GS,rmw protected
082B illegal
082B illegal
3B:
0
0
0
0
0
0
0
0
3C:
0 unused?
0
0
0
0
0
082B illegal
082B illegal
3D:
0
0
0
0
0
0
0
0
3E:
0
0
0
0
0
0
082B illegal
082B illegal
3F:
0
0
0
0
0
0
0
0
40: POP mv
309F POP rmv?
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
41:
0
0
0
0
0
0
0
0
42:
30AC POP rmv?
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
43:
0
0
0
0
0
0
0
0
44: MOV rm,i
0005
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
45:
0
0
0
0
0
0
0
0
46:
1015
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
47:
0
0
0
0
0
0
0
0
48:
0 MOV TRn,rd
0
0
0
0
0
0
0
49:
082B illegal
082B illegal
082B illegal
082B illegal
0391 TR4
0391 TR5
0391 TR6
0391 TR7
4A:
0
0
0
0
0
0
0
0
4B:
082B illegal
082B illegal
082B illegal
082B illegal
0391 TR4
0391 TR5
0391 TR6
0391 TR7
4C:
06B6 ARPL rmw,rw protected
06B6
06B6
06B6
06B6
06B6
06B6
06B6
4D:
0
0
0
0
0
0
0
0
4E:
16AA
16AA
16AA
16AA
16AA
16AA
16AA
16AA
4F:
0
0
0
0
0
0
0
0
50: misc rmb
0021 INC
0021 DEC
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
51:
0
0
0
0
0
0
0
0
52:
904E INC
904E DEC
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
53:
0
0
0
0
0
0
0
0
54: misc rmv
0021
0021
2079
082B illegal
006D
082B illegal
2086
082B illegal
55:
0
0
0
0
0
0
0
0
56:
904E INC
904E DEC
107C CALL rmv
12DA CALL FAR m
106F JMP rmv
12F5 JMP FAR m
1081 PUSH rmv
082B illegal
57:
0
0
0
0
0
0
0
0
58: math rm
0025 TEST
0025 TEST
0021 NOT
0021 NEG
01A5 MUL
01A5 IMUL
01C7 DIV
01D3 IDIV
59:
0
0
0
0
0
0
0
0
5A:
1031 TEST
1031 TEST
904E NOT
904E NEG
11AF MUL
11AF IMUL
11CF DIV
11E1 IDIV
5B:
0
0
0
0
0
0
0
0
5C:
0 MOV rd,TRn
0
0
0
0
0
0
0
5D:
082B illegal
082B illegal
082B illegal
082B illegal
03B6 TR4
03B6 TR5
03B6 TR6
03B6 TR7
5E:
0
0
0
0
0
0
0
0
5F:
082B illegal
082B illegal
082B illegal
082B illegal
03B6 TR4
03B6 TR5
03B6 TR6
03B6 TR7
60: rot rm,ib
00F9
00F9
00E5
00E5
00F9
00F9
00F9
00F9
61:
0
0
0
0
0
0
0
0
62:
111E
111E
1108
1108
111E
111E
111E
111E
63:
0
0
0
0
0
0
0
0
64: rot rm,1
0105
0105
0105
0105
0105
0105
0105
0105
65:
0
0
0
0
0
0
0
0
66:
112A
112A
112A
112A
112A
112A
112A
112A
67:
0
0
0
0
0
0
0
0
68: rot rm,CL
00FF
00FF
00E9
00E9
00FF
00FF
00FF
00FF
69:
0
0
0
0
0
0
0
0
6A:
112D
112D
110C
110C
112D
112D
112D
112D
6B:
0
0
0
0
0
0
0
0
6C: BT rv/m,rv
0
0
0
0
0
0
0
0
6D:
0131
0131
0131
0131
0131
0131
0131
0131
6E:
0
0
0
0
0
0
0
0
6F:
1134
1134
1134
1134
1134
1134
1134
1134
70: BT/BTS/BTR/BTC rv/m,ib
0
0
0
0
0
0
0
0
71:
082B illegal
082B illegal
082B illegal
082B illegal
013F TR4
015A TR5
015A TR6
015A TR7
72:
0
0
0
0
0
0
0
0
73:
082B illegal
082B illegal
082B illegal
082B illegal
1142 TR4
9160 TR5
9160 TR6
9160 TR7
74: BTS/BTR/BTC rv/m,rv
0
0
0
0
0
0
0
0
75:
0147
0147
0147
0147
0147
0147
0147
0147
76:
0
0
0
0
0
0
0
0
77:
914D
914D
914D
914D
914D
914D
914D
914D
78: LFS/LGS rv,m
0
0
0
0
0
0
0
0
79:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
7A:
0
0
0
0
0
0
0
0
7B:
10D0
10D0
10D0
10D0
10D0
10D0
10D0
10D0
7C: ARPL/SLDT/STR/LLT/LTR/VERR/VERW/LAR/LSL real mode
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
7D:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
7E:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
7F:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
80: SLDT/STR/LLT/LTR/VERR/VERW rmw
0
0
0
0
0
0
0
0
81:
06E2
06CF
06D6
06C3
0703
0709
082B illegal
082B illegal
82:
0
0
0
0
0
0
0
0
83:
16E0
16CD
16D1
16BE
1700
1706
082B illegal
082B illegal
84: INC/DEC rv SGDT/SIDT/LGDT/LIDT/SMSW/LMSW rmw
0
0
0
0
0
0
0
0
85:
082B illegal
082B illegal
082B illegal
082B illegal
0358
082B illegal
034E
082B illegal
86:
0
0
0
0
0
0
0
0
87:
0340
033D
1332
132E
135A
082B illegal
1349
082B illegal
88: LAR rv,rmv protected
0
0
0
0
0
0
0
0
89:
06E7
06E7
06E7
06E7
06E7
06E7
06E7
06E7
8A:
0
0
0
0
0
0
0
0
8B:
16E4
16E4
16E4
16E4
16E4
16E4
16E4
16E4
8C: LSL rv,rmv alu A,i excluding CMP
0
0
0
0
0
0
0
0
8D:
06EC
06EC
06EC
06EC
06EC
06EC
06EC
06EC
8E:
0
0
0
0
0
0
0
0
8F:
16EA
16EA
16EA
16EA
16EA
16EA
16EA
16EA
90: IBTS rmv,eAX,CL,rv
0
0
0
0
0
0
0
0
91:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
92:
0
0
0
0
0
0
0
0
93:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
94: XBTS rv,rmv,eAX,CL CMP/TEST A,i
0
0
0
0
0
0
0
0
95:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
96:
0
0
0
0
0
0
0
0
97:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
98: SHxD rmv,rv,ib
0
0
0
0
0
0
0
0
99:
00FC
00FC
00FC
00FC
00FC
00FC
00FC
00FC
9A:
0
0
0
0
0
0
0
0
9B:
1124
1124
1124
1124
1124
1124
1124
1124
9C: SHxD rmv,rv,CL
0
0
0
0
0
0
0
0
9D:
0102
0102
0102
0102
0102
0102
0102
0102
9E:
0
0
0
0
0
0
0
0
9F:
112F
112F
112F
112F
112F
112F
112F
112F
A0: ESC?
04C1
04C1
04C1
04C1
04C1
04C1
04C1
04C1
A1:
0
0
0
0
0
0
0
0
A2:
14D7
14D7
14D7
14D7
14D7
14D7
14D7
14D7
A3:
0
0
0
0
0
0
0
0
A4: ESC?
04C1
04C1
04C1
04C1
04C1
04C1
04C1
04C1
A5:
0
0
0
0
0
0
0
0
A6:
14E0
14E0
14E0
14E0
14E0
14E0
14E0
14E0
A7:
0
0
0
0
0
0
0
0
A8: ESC?
04C1
04C1
04C1
04C1
04C1
04C1
04C1
04C1
A9:
0
0
0
0
0
0
0
0
AA:
14DB
04C1
1540
1540
145C
04C1
13F0
03D9
AB:
0
0
0
0
0
0
0
0
AC: ESC?
04C1
04C1
04C1
04C1
04C1
04C1
04C1
04C1
AD:
0
0
0
0
0
0
0
0
AE:
14D7
04C1
153C
153C
1459
14DF
13ED
03D9
AF:
0
0
0
0
0
0
0
0
B0: ESC?
04C1
04C1
04C1
04C1
03DA
03DA
03DA
03DA
B1:
0
0
0
0
0
0
0
0
B2:
14E0
04C1
1544
1544
14D3
14DB
1538
1540
B3:
0
0
0
0
0
0
0
0
B4: SETcond rmb
0
0
0
0
0
0
0
0
B5:
003D
003D
003D
003D
003D
003D
003D
003D
B6:
0
0
0
0
0
0
0
0
B7:
1043
1043
1043
1043
1043
1043
1043
1043
B8: MOVZX/MOVSX r,rm (16-bit?)
0
0
0
0
0
0
0
0
B9:
01E8
01E8
01E8
01E8
01E8
01E8
01E8
01E8
BA:
0
0
0
0
0
0
0
0
BB:
11EB
11EB
11EB
11EB
11EB
11EB
11EB
11EB
BC: MOVZX/MOVSX r,rm (32-bit?)
0
0
0
0
0
0
0
0
BD:
01F0
01F0
01F0
01F0
01F0
01F0
01F0
01F0
BE:
0
0
0
0
0
0
0
0
BF:
11F3
11F3
11F3
11F3
11F3
11F3
11F3
11F3
C0: BSF rv,rmv
0
0
0
0
0
0
0
0
C1:
0168
0168
0168
0168
0168
0168
0168
0168
C2:
0
0
0
0
0
0
0
0
C3:
1177
1177
1177
1177
1177
1177
1177
1177
C4: BSR rv,rmv
0
0
0
0
0
0
0
0
C5:
017A
017A
017A
017A
017A
017A
017A
017A
C6:
0
0
0
0
0
0
0
0
C7:
1184
1184
1184
1184
1184
1184
1184
1184
C8: MOV CRn,rd
0
0
0
0
0
0
0
0
C9:
035C CR0
082B illegal
0368 CR2
036C CR3
082B illegal
082B illegal
082B illegal
082B illegal
CA:
0
0
0
0
0
0
0
0
CB:
035C CR0
082B illegal
0368 CR2
036C CR3
082B illegal
082B illegal
082B illegal
082B illegal
CC: MOV rd,CRn
0
0
0
0
0
0
0
0
CD:
0371 CR0
082B illegal
0377 CR2
0379 CR3
082B illegal
082B illegal
082B illegal
082B illegal
CE:
0
0
0
0
0
0
0
0
CF:
0371 CR0
082B illegal
0377 CR2
0379 CR3
082B illegal
082B illegal
082B illegal
082B illegal
D0: MOV DRn,rd
0
0
0
0
0
0
0
0
D1:
038A
038A
038A
038A
037B
037F
037B
037F
D2:
0
0
0
0
0
0
0
0
D3:
038A
038A
038A
038A
037B
037F
037B
037F
D4: MOV rd,DRn
0
0
0
0
0
0
0
0
D5:
03AE
03AE
03AE
03AE
03A6
03AA
03A6
03AA
D6:
0
0
0
0
0
0
0
0
D7:
03AE
03AE
03AE
03AE
03A6
03AA
03A6
03AA
D8: ESC?
04C1
04C1
04C1
04C1
04C1
04C1
04C1
04C1
D9:
0
0
0
0
0
0
0
0
DA:
14DB
14DB
14DB
14DB
14DB
14DB
14DB
14DB
DB:
0
0
0
0
0
0
0
0
DC: ESC?
03CD
03CD
03CD
03CD
03CD
03CD
03CD
03CD
DD:
0
0
0
0
0
0
0
0
DE:
14D7
04C1
153C
153C
04C1
14D3
0
1538
DF:
0
0
0
0
0
0
0
0
E0: LEA rv,m
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
E1:
0
0
0
0
0
0
0
0
E2:
10B9
10B9
10B9
10B9
10B9
10B9
10B9
10B9
E3:
0
0
0
0
0
0
0
0
E4: LES
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
E5:
0
0
0
0
0
0
0
0
E6:
10C2
10C2
10C2
10C2
10C2
10C2
10C2
10C2
E7:
0
0
0
0
0
0
0
0
E8: LDS
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
E9:
0
0
0
0
0
0
0
0
EA:
10BB
10BB
10BB
10BB
10BB
10BB
10BB
10BB
EB:
0
0
0
0
0
0
0
0
EC: BOUND rv,m2v
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
ED:
0
0
0
0
0
0
0
0
EE:
1818
1818
1818
1818
1818
1818
1818
1818
EF:
0
0
0
0
0
0
0
0
F0: LSS rv,m
0
0
0
0
0
0
0
0
F1:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
F2:
0
0
0
0
0
0
0
0
F3:
10C9
10C9
10C9
10C9
10C9
10C9
10C9
10C9
F4: unused?
0849
0849
0849
0849
0849
0849
0849
0849
F5:
0849
0849
0849
0849
0849
0849
0849
0849
F6:
0849
0849
0849
0849
0849
0849
0849
0849
F7:
0849
0849
0849
0849
0849
0849
0849
0849
F8: unused?
0844
0844
0844
0844
0844
0844
0844
0844
F9:
0844
0844
0844
0844
0844
0844
0844
0844
FA:
0844
0844
0844
0844
0844
0844
0844
0844
FB:
0844
0844
0844
0844
0844
0844
0844
0844
FC: unused?
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
FD:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
FE:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
FF:
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
082B illegal
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