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80386
Encoding
of
32-bit
Address
Mode
with
"mod
rIm"
byte
(no
"s-i-b"
byte
present):
mod
rIm
Effective
Address
mod
rIm
Effective
Address
00000
OS:
[EAX)
10000
OS:[EAX+d32)
00001
OS:
[ECX)
10001
OS:
[ECX + d32)
00010
OS:[EOX)
10010
OS:
[EOX
+ d32)
00011 OS:[EBX)
10011
OS:
[EBX + d32)
00100
s-i-b is present
10100
s-i-b
is
present
00101 OS:d32 10101
SS:
[EBP + d32)
00110
OS:
[ESI)
10110
OS:
[ESI
+ d32)
00111
OS:[EOI)
10
111
OS:
[EOI
+ d32)
01000
OS:[EAX+dS)
11
000
register-see
below
01001
OS:
[ECX +
dS)
11001
register-see
below
01
010
OS:[EOX+dS)
11010
register-see
below
01
011
OS:[EBX+dS)
11
011
register-see
below
01
100
s-i-b
is
present
11
100
register-see
below
01
101
SS:
[EBP +
dS)
11
101
register-see
below
01
110
OS:
[ESI
+
dS)
11
110
register-see
below
01
111
OS:
[EOI
+
dS)
11
111
register-see
below
Register Specified
by
reg
or
rIm
during
16-Bit Data Operations:
mod
rIm
function
of
w
field
(when
w=O)
(when
w=
1)
11000
AL
AX
11001
CL
CX
11
010
DL
DX
11
011
BL
BX
11100
AH
SP
11
101
CH
BP
11
110
DH
SI
11
111
BH
01
Register Specified
by
reg
or
rIm
during
32-Bit Data Operations:
mod
rIm
function
of
w
field
(whenw=O)
(whenw=
1)
11
000
AL EAX
11001 CL
ECX
11
010
OL
EOX
11
011
BL EBX
11100
AH
ESP
11
101
CH
EBP
11
110
DH
ESI
11
111
BH
EDI
129