feustel@ihlpl.UUCP (Feustel) (11/24/85)
(some of) 386 registers
general regs seg regs
+-----------------+ +--------+
eax | | ax | cs | |
+-----------------+ +--------+
ebx | | bx | ss | |
+-----------------+ +--------+
ecx | | cx | ds | |
+-----------------+ +--------+
edx | | dx | es | |
+-----------------+ +--------+
esi | | si | fs | |
+-----------------+ +--------+
edi | | di | gs | |
+-----------------+ +--------+
ebp | | bp |
+-----------------+
esp | | sp |
+-----------------+
+-----------------+
eip | | ip |
+-----------------+
efl | | fl |
+-----------------+
---------------------386 addressing - 16-bit address mode-------------------------
\ mod 00 01 10 11 - reg and r/m
\
r/m 32-bit data 16-bit data
override
w=0 w=1 w=0 w=1
000 ds:[bx+si] ds:[bx+si+d8] ds:[bx+si+d16] al eax al ax
001 ds:[bx+di] ds:[bx+di+d8] ds:[bx+di+d16] cl ecx cl cx
010 ds:[bp+si] ds:[bp+si+d8] ds:[bp+si+d16] dl edx dl dx
011 ds:[bp+di] ds:[bp+di+d8] ds:[bp+di+d16] bl ebx bl bx
100 ds:[si] ds:[si+d8] ds:[si+d16] ah esp ah sp
101 ds:[di] ss:[di+d8] ss:[di+d16] ch ebp ch bp
110 ds:d16 ds:[bx+d8] ds:[bx+d16] dh esi dh si
111 ds:[bx] ds:[bp+d8] ds:[bp+d16] bh edi bh di
---------------------386 addressing - 32-bit address mode-------------------------
\ mod 00 01 10 11 - reg and r/m
\
r/m 32-bit data 16-bit data
override
w=0 w=1 w=0 w=1
000 ds:[eax] ds:[eax+d8] ds:[eax+d32] al eax al ax
001 ds:[ecx] ds:[ecx+d8] ds:[eax+d32] cl ecx cl cx
010 ds:[edx] ds:[edx+d8] ds:[edx+d32] dl edx dl dx
011 ds:[ebx] ds:[ebx+d8] ds:[ebx+d32] bl ebx bl bx
100 s-i-b addressing mode ah esp ah sp
101 ds:d32 ss:[ebp+d8] ss:[ebp+d32] ch ebp ch bp
110 ds:[esi] ds:[esi+d8] ds:[esi+d32] dh esi dh si
111 ds:[edi] ds:[edi+d8] ds:[edi+d32] bh edi bh di
s-i-b addressing mode
base/sir sir
000 ds:[eax+sir] ds:[eax+sir+d8] ds:[eax+sir+d32] eax
001 ds:[ecx+sir] ds:[eax+sir+d8] ds:[eax+sir+d32] ecx
010 ds:[edx+sir] ds:[edx+sir+d8] ds:[edx+sir+d32] edx
011 ds:[ebx+sir] ds:[ebx+sir+d8] ds:[ebx+sir+d32] ebx
100 ss:[esp+sir] ss:[esp+sir+d8] ss:[esp+sir+d32] no index reg
101 ss:[ebp+sir] ss:[ebp+sir+d8] ss:[ebp+sir+d32] ebp
110 ds:[esi+sir] ds:[esi+sir+d8] ds:[esi+sir+d32] esi
111 ds:[edi+sir] ds:[edi+sir+d8] ds:[edi+sir+d32] edi
ss 00 01 10 11
index
scale x1 x2 x4 x8
factor