mod R/M byte
| r8(/r) without REX r8(/r) with REX r16(/r) r32(/r) r64(/r) mm(/r) sreg eee eee |
REX2 EVEX R'=0 |
REX R=0 |
AL AL AX EAX RAX MM0 ES CR0 DR0 |
CL CL CX ECX RCX MM1 CS CR1 DR1 |
DL DL DX EDX RDX MM2 SS CR2 DR2 |
BL BL BX EBX RBX MM3 DS CR3 DR3 |
AH SPL SP ESP RSP MM4 FS CR4 DR4 |
CH BPL BP EBP RBP MM5 GS CR5 DR5 |
DH SIL SI ESI RSI MM6 res. CR6 DR6 |
BH DIL DI EDI RDI MM7 res. CR7 DR7 |
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| r8(/r) r16(/r) r32(/r) r64(/r) eee eee |
REX R=1 |
R8B R8W R8D R8 CR8 DR8 |
R9B R9W R9D R9 CR9 DR9 |
R10B R10W R10D R10 CR10 DR10 |
R11B R11W R11D R11 CR11 DR11 |
R12B R12W R12D R12 CR12 DR12 |
R13B R13W R13D R13 CR13 DR13 |
R14B R14W R14D R14 CR14 DR14 |
R15B R15W R15D R15 CR15 DR15 |
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| r8(/r) r16(/r) r32(/r) r64(/r) eee eee |
REX2 EVEX R'=1 |
REX2 EVEX R=0 |
R16B R16W R16D R16 CR16 DR16 |
R17B R17W R17D R17 CR17 DR17 |
R18B R18W R18D R18 CR18 DR18 |
R19B R19W R19D R19 CR19 DR19 |
R20B R20W R20D R20 CR20 DR20 |
R21B R21W R21D R21 CR21 DR21 |
R22B R22W R22D R22 CR22 DR22 |
R23B R23W R23D R23 CR23 DR23 |
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| r8(/r) r16(/r) r32(/r) r64(/r) eee eee |
REX2 EVEX R=1 |
R24B R24W R24D R24 CR24 DR24 |
R25B R25W R25D R25 CR25 DR25 |
R26B R26W R26D R26 CR26 DR26 |
R27B R27W R27D R27 CR27 DR27 |
R28B R28W R28D R28 CR28 DR28 |
R29B R29W R29D R29 CR29 DR29 |
R30B R30W R30D R30 CR30 DR30 |
R31B R31W R31D R31 CR31 DR31 |
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| xmm(/r) ymm(/r) zmm(/r) |
MVEX EVEX R'=0 |
REX R=0 |
XMM0 YMM0 ZMM0 |
XMM1 YMM1 ZMM1 |
XMM2 YMM2 ZMM2 |
XMM3 YMM3 ZMM3 |
XMM4 YMM4 ZMM4 |
XMM5 YMM5 ZMM5 |
XMM6 YMM6 ZMM6 |
XMM7 YMM7 ZMM7 |
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| xmm(/r) ymm(/r) zmm(/r) |
REX R=1 |
XMM8 YMM8 ZMM8 |
XMM9 YMM9 ZMM9 |
XMM10 YMM10 ZMM10 |
XMM11 YMM11 ZMM11 |
XMM12 YMM12 ZMM12 |
XMM13 YMM13 ZMM13 |
XMM14 YMM14 ZMM14 |
XMM15 YMM15 ZMM15 |
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| xmm(/r) ymm(/r) zmm(/r) |
MVEX EVEX R'=1 |
MVEX EVEX R=0 |
XMM16 YMM16 ZMM16 |
XMM17 YMM17 ZMM17 |
XMM18 YMM18 ZMM18 |
XMM19 YMM19 ZMM19 |
XMM20 YMM20 ZMM20 |
XMM21 YMM21 ZMM21 |
XMM22 YMM22 ZMM22 |
XMM23 YMM23 ZMM23 |
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| xmm(/r) ymm(/r) zmm(/r) |
MVEX EVEX R=1 |
XMM24 YMM24 ZMM24 |
XMM25 YMM25 ZMM25 |
XMM26 YMM26 ZMM26 |
XMM27 YMM27 ZMM27 |
XMM28 YMM28 ZMM28 |
XMM29 YMM29 ZMM29 |
XMM30 YMM30 ZMM30 |
XMM31 YMM31 ZMM31 |
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| /digit (opcode) reg= |
0 000 |
1 001 |
2 010 |
3 011 |
4 100 |
5 101 |
6 110 |
7 111 |
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| effective address |
mod | R/M | value of mod R/M byte (hex) | ||||||||||||||
| traditional | vector |
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| REX2/EVEX.B'=0 | REX2/EVEX.B'=1 | MVEX/EVEX.X=0 (not B') | MVEX/EVEX.X=1 (not B') | ||||||||||||||
| REX.B=0 | REX.B=1 | REX2/EVEX.B=0 | REX2/EVEX.B=1 | REX.B=0 | REX.B=1 | MVEX/EVEX.B=0 | MVEX/EVEX.B=1 | ||||||||||
| [rAX] [rCX] [rDX] [rBX] [sib] [*] #1 [rSI] [rDI] |
[r8] [r9] [r10] [r11] [sib] [*] #1 [r14] [r15] |
[r16] [r17] [r18] [r19] [sib] [*] #1 [r22] [r23] |
[r24] [r25] [r26] [r27] [sib] [*] #1 [r30] [r31] |
00 |
000 001 010 011 100 101 110 111 |
00 01 02 03 04 05 06 07 |
08 09 0A 0B 0C 0D 0E 0F |
10 11 12 13 14 15 16 17 |
18 19 1A 1B 1C 1D 1E 1F |
20 21 22 23 24 25 26 27 |
28 29 2A 2B 2C 2D 2E 2F |
30 31 32 33 34 35 36 37 |
38 39 3A 3B 3C 3D 3E 3F |
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| [rAX+sbyte]#2 [rCX+sbyte] [rDX+sbyte] [rBX+sbyte] [sib+sbyte] [rBP+sbyte] (defaults to SS) [rSI+sbyte] [rDI+sbyte] |
[r8+sbyte] [r9+sbyte] [r10+sbyte] [r11+sbyte] [sib+sbyte] [r13+sbyte] [r14+sbyte] [r15+sbyte] |
[r16+sbyte] [r17+sbyte] [r18+sbyte] [r19+sbyte] [sib+sbyte] [r21+sbyte] [r22+sbyte] [r23+sbyte] |
[r24+sbyte] [r25+sbyte] [r26+sbyte] [r27+sbyte] [sib+sbyte] [r29+sbyte] [r30+sbyte] [r31+sbyte] |
01 |
000 001 010 011 100 101 110 111 |
40 41 42 43 44 45 46 47 |
48 49 4A 4B 4C 4D 4E 4F |
50 51 52 53 54 55 56 57 |
58 59 5A 5B 5C 5D 5E 5F |
60 61 62 63 64 65 66 67 |
68 69 6A 6B 6C 6D 6E 6F |
70 71 72 73 74 75 76 77 |
78 79 7A 7B 7C 7D 7E 7F |
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| [rAX+sdword] [rCX+sdword] [rDX+sdword] [rBX+sdword] [sib+sdword] [rBP+sdword] (defaults to SS) [rSI+sdword] [rDI+sdword] |
[r8+sdword] [r9+sdword] [r10+sdword] [r11+sdword] [sib+sdword] [r13+sdword] [r14+sdword] [r15+sdword] |
[r16+sdword] [r17+sdword] [r18+sdword] [r19+sdword] [sib+sdword] [r21+sdword] [r22+sdword] [r23+sdword] |
[r24+sdword] [r25+sdword] [r26+sdword] [r27+sdword] [sib+sdword] [r29+sdword] [r30+sdword] [r31+sdword] |
10 |
000 001 010 011 100 101 110 111 |
80 81 82 83 84 85 86 87 |
88 89 8A 8B 8C 8D 8E 8F |
90 91 92 93 94 95 96 97 |
98 99 9A 9B 9C 9D 9E 9F |
A0 A1 A2 A3 A4 A5 A6 A7 |
A8 A9 AA AB AC AD AE AF |
B0 B1 B2 B3 B4 B5 B6 B7 |
B8 B9 BA BB BC BD BE BF |
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| AL/rAX or MM0 CL/rCX or MM1 DL/rDX or MM2 BL/rBX or MM3 AH/SPL/rSP or MM4 CH/BPL/rBP or MM5 DH/SIL/rSI or MM6 BH/DIL/rDI or MM7 |
R8{B,W,D,Q} R9{B,W,D,Q} R10{B,W,D,Q} R11{B,W,D,Q} R12{B,W,D,Q} R13{B,W,D,Q} R14{B,W,D,Q} R15{B,W,D,Q} |
R16{B,W,D,Q} R17{B,W,D,Q} R18{B,W,D,Q} R19{B,W,D,Q} R20{B,W,D,Q} R21{B,W,D,Q} R22{B,W,D,Q} R23{B,W,D,Q} |
R24{B,W,D,Q} R25{B,W,D,Q} R26{B,W,D,Q} R27{B,W,D,Q} R28{B,W,D,Q} R29{B,W,D,Q} R30{B,W,D,Q} R31{B,W,D,Q} |
{X,Y,Z}MM0 {X,Y,Z}MM1 {X,Y,Z}MM2 {X,Y,Z}MM3 {X,Y,Z}MM4 {X,Y,Z}MM5 {X,Y,Z}MM6 {X,Y,Z}MM7 |
{X,Y,Z}MM8 {X,Y,Z}MM9 {X,Y,Z}MM10 {X,Y,Z}MM11 {X,Y,Z}MM12 {X,Y,Z}MM13 {X,Y,Z}MM14 {X,Y,Z}MM15 |
{X,Y,Z}MM16 {X,Y,Z}MM17 {X,Y,Z}MM18 {X,Y,Z}MM19 {X,Y,Z}MM20 {X,Y,Z}MM21 {X,Y,Z}MM22 {X,Y,Z}MM23 |
{X,Y,Z}MM24 {X,Y,Z}MM25 {X,Y,Z}MM26 {X,Y,Z}MM27 {X,Y,Z}MM28 {X,Y,Z}MM29 {X,Y,Z}MM30 {X,Y,Z}MM31 |
11 |
000 001 010 011 100 101 110 111 |
C0 C1 C2 C3 C4 C5 C6 C7 |
C8 C9 CA CB CC CD CE CF |
D0 D1 D2 D3 D4 D5 D6 D7 |
D8 D9 DA DB DC DD DE DF |
E0 E1 E2 E3 E4 E5 E6 E7 |
E8 E9 EA EB EC ED EE EF |
F0 F1 F2 F3 F4 F5 F6 F7 |
F8 F9 FA FB FC FD FE FF |
| note | description | ||||||||||||||||
| #1 |
if PM64 and adsize=64, then effective address = [RIP+sdword] if PM64 and adsize=32, then effective address = [EIP+sdword] else effective address = [sdword] |
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| #2 | if MVEX/EVEX, then sbyte is interpreted as sbyte*N | ||||||||||||||||
© 1996-2024 by Christian Ludloff. All rights reserved. Use at your own risk.