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] [SS:BP+SI] [SS:BP+DI] [SI] [DI] [ [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] [SS:BP+SI+sbyte] [SS:BP+DI+sbyte] [SI+sbyte] [DI+sbyte] [SS:BP+sbyte] [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] [SS:BP+SI+sword] [SS:BP+DI+sword] [SI+sword] [DI+sword] [SS:BP+sword] [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 or MM0 XMM0 YMM0 ZMM0 CL CX ECX or MM1 XMM1 YMM1 ZMM1 DL DX EDX or MM2 XMM2 YMM2 ZMM2 BL BX EBX or MM3 XMM3 YMM3 ZMM3 AH SP ESP or MM4 XMM4 YMM4 ZMM4 CH BP EBP or MM5 XMM5 YMM5 ZMM5 DH SI ESI or MM6 XMM6 YMM6 ZMM6 BH DI EDI or 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.