MPS Lectures - Chapter 3

XCHG = Exchange:

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

1 0 0 0 0 1 1 w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

1 0 0 1 0  reg

IN = Input from:

Fixed port

1 1 1 0 0 1 0 w

DATA-8

Variable port

1 1 1 0 1 1 0 w

OUT = Output to:

Fixed port

1 1 1 0 0 1 1 w

DATA-8

Variable port

1 1 1 0 1 1 1 w

XLAT = Translate byte to AL

1 1 0 1 0 1 1 1

LEA = Load EA to register

1 0 0 0 1 1 0 1

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

LDS = Load pointer to DS

1 1 0 0 0 1 0 1

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

LES = Load pointer to ES

1 1 0 0 0 1 0 0

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

LAHF = Load AH with flags

1 0 0 1 1 1 1 1

SAHF = Store AH into flags

1 0 0 1 1 1 1 0

PUSHF = Push flags

1 0 0 1 1 1 0 0

POPF = Pop flags

1 0 0 1 1 1 0 1

ARITHMETIC

ADD = Add:

Reg/memory with register to either

0 0 0 0 0 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate to register/memory

1 0 0 0 0 0 s w

 mod  0 0 0 r/m

(DISP-LO)

(DISP-HI)

data

data if s:w=01

Immediate to accumulator

0 0 0 0 0 1 0 w

data

data if w=1

ADC = Add with carry:

Reg/memory with register to either

0 0 0 1 0 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate to register/memory

1 0 0 0 0 0 s w

 mod  0 1 0 r/m

(DISP-LO)

(DISP-HI)

data

data if s:w=01

Immediate to accumulator

0 0 0 1 0 1 0 w

data

data if w=1

INC = Increment:

1 1 1 1 1 1 1 w

 mod  0 0 0 r/m

(DISP-LO)

(DISP-HI)

0 1 0 0 0  reg

AAA = ASCII adjust for add

0 0 1 1 0 1 1 1

DAA = Decimal adjust for add

0 0 1 0 0 1 1 1

SUB = Subtract:

Reg/memory and register to either

0 0 1 0 1 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate from register/memory

1 0 0 0 0 0 s w

 mod  1 0 1 r/m

(DISP-LO)

(DISP-HI)

data

data if s:w=01

Immediate from accumulator

0 0 1 0 1 1 0 w

data

data if w=1

SBB = Subtract with borrow:

Reg/memory and register to either

0 0 0 1 1 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate from register/memory

1 0 0 0 0 0 s w

 mod  0 1 1 r/m

(DISP-LO)

(DISP-HI)

data

data if s:w=01

Immediate from accumulator

0 0 0 1 1 1 0 w

data

data if w=1

DEC = Decrement:

1 1 1 1 1 1 1 w

 mod  0 0 1 r/m

(DISP-LO)

(DISP-HI)

0 1 0 0 1  reg

REG Change sign

1 1 1 1 0 1 1 w

 mod  0 1 1 r/m

(DISP-LO)

(DISP-HI)

CMP = Compare:

0 0 1 1 1 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate with register/memory

1 0 0 0 0 0 s w

 mod  1 1 1 r/m

(DISP-LO)

(DISP-HI)

data

data if s:w=01

Immediate with accumulator

0 0 1 1 1 1 0 w

data

data if w=1

AAS = ASCII adjust for subtract

0 0 1 1 1 1 1 1

DAS = Decimal adjust for subtract

0 0 1 0 1 1 1 1

MUL = Multiply (unsigned)

1 1 1 1 0 1 1 w

 mod  1 0 0 r/m

(DISP-LO)

(DISP-HI)

IMUL = Integer multiply (signed)

1 1 1 1 0 1 1 w

 mod  1 0 1 r/m

(DISP-LO)

(DISP-HI)

AAM = ASCII adjust for multiply

1 1 0 1 0 1 0 0

0 0 0 0 1 0 1 0

DIV = Divide (unsigned)

1 1 1 1 0 1 1 w

 mod  1 1 0 r/m

(DISP-LO)

(DISP-HI)

IDIV = Integer divide (signed)

1 1 1 1 0 1 1 w

 mod  1 1 1 r/m

(DISP-LO)

(DISP-HI)

AAD = ASCII adjust for divide

1 1 0 1 0 1 0 1

0 0 0 0 1 0 1 0

CBW = Convert byte to word

1 0 0 1 1 0 0 0

CWD = Convert word to double word

1 0 0 1 1 0 0 1

LOGIC

NOT = Invert

1 1 1 1 0 1 1 w

 mod  0 1 0 r/m

(DISP-LO)

(DISP-HI)

SHL/SAL = Shift logical/arithmetic left

1 1 0 1 0 0 v w

 mod  1 0 0 r/m

(DISP-LO)

(DISP-HI)

SHR = Shift logical right

1 1 0 1 0 0 v w

 mod  1 0 1 r/m

(DISP-LO)

(DISP-HI)

SAR = Shift arithmetic right

1 1 0 1 0 0 v w

 mod  1 1 1 r/m

(DISP-LO)

(DISP-HI)

ROL = Rotate left

1 1 0 1 0 0 v w

 mod  0 0 0 r/m

(DISP-LO)

(DISP-HI)

ROR = Rotate right

1 1 0 1 0 0 v w

 mod  0 0 1 r/m

(DISP-LO)

(DISP-HI)

RCL = Rotate through carry flag left

1 1 0 1 0 0 v w

 mod  0 1 0 r/m

(DISP-LO)

(DISP-HI)

ROR = Rotate through carry right

1 1 0 1 0 0 v w

 mod  0 1 1 r/m

(DISP-LO)

(DISP-HI)

AND = And:

Reg/memory with register to either

0 0 1 0 0 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate to register/memory

1 0 0 0 0 0 0 w

 mod  1 0 0 r/m

(DISP-LO)

(DISP-HI)

data

data if w=1

Immediate to accumulator

0 0 1 0 0 1 0 w

data

data if w=1