16-bit mod R/M byte
| r8(/r) r16(/r) r32(/r) mm(/r) xmm(/r) ymm(/r) zmm(/r) sreg eee eee /digit (opcode) reg= |
AL AX EAX MM0 XMM0 YMM0 ZMM0 ES CR0 DR0 0 000 |
CL CX ECX MM1 XMM1 YMM1 ZMM1 CS CR1 DR1 1 001 |
DL DX EDX MM2 XMM2 YMM2 ZMM2 SS CR2 DR2 2 010 |
BL BX EBX MM3 XMM3 YMM3 ZMM3 DS CR3 DR3 3 011 |
AH SP ESP MM4 XMM4 YMM4 ZMM4 FS CR4 DR4 4 100 |
CH BP EBP MM5 XMM5 YMM5 ZMM5 GS CR5 DR5 5 101 |
DH SI ESI MM6 XMM6 YMM6 ZMM6 res. CR6 DR6 6 110 |
BH DI EDI MM7 XMM7 YMM7 ZMM7 res. CR7 DR7 7 111 |
||
| effective address | mod | R/M | value of mod R/M byte (hex) | |||||||
| [BX+SI] [BX+DI] [BP+SI] (defaults to SS) [BP+DI] (defaults to SS) [SI] [DI] [sword] [BX] |
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 |
| [BX+SI+sbyte] [BX+DI+sbyte] [BP+SI+sbyte] (defaults to SS) [BP+DI+sbyte] (defaults to SS) [SI+sbyte] [DI+sbyte] [BP+sbyte] (defaults to SS) [BX+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 |
| [BX+SI+sword] [BX+DI+sword] [BP+SI+sword] (defaults to SS) [BP+DI+sword] (defaults to SS) [SI+sword] [DI+sword] [BP+sword] (defaults to SS) [BX+sword] |
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 |
| AL/AX/EAX/MM0/XMM0/YMM0/ZMM0 CL/CX/ECX/MM1/XMM1/YMM1/ZMM1 DL/DX/EDX/MM2/XMM2/YMM2/ZMM2 BL/BX/EBX/MM3/XMM3/YMM3/ZMM3 AH/SP/ESP/MM4/XMM4/YMM4/ZMM4 CH/BP/EBP/MM5/XMM5/YMM5/ZMM5 DH/SI/ESI/MM6/XMM6/YMM6/ZMM6 BH/DI/EDI/MM7/XMM7/YMM7/ZMM7 |
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: MVEX requires PM64, which in turn precludes 16-bit addressing, which in turn precludes ZMM0...ZMM7
© 1996-2024 by Christian Ludloff. All rights reserved. Use at your own risk.