MPS Lectures - Chapter 3

TEST = And function to flags no result:

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 0 w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate data and register/memory

1 1 1 1 0 1 1 w

 mod  0 0 0 r/m

(DISP-LO)

(DISP-HI)

data

data if w=1

Immediate data and accumulator

1 0 1 0 1 0 0 w

data

data if w=1

OR = Or:

Reg/memory and register to either

0 0 0 0 1 0 d w

 mod   reg  r/m

(DISP-LO)

(DISP-HI)

Immediate to register/memory

1 0 0 0 0 0 0 w

 mod  0 0 1 r/m

(DISP-LO)

(DISP-HI)

data

data if w=1

Immediate to accumulator

0 0 0 0 1 1 0 w

data

data if w=1

XOR = Exclusive or:

Reg/memory and register to either

0 0 1 1 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 1 0 r/m

(DISP-LO)

(DISP-HI)

data

data if w=1

Immediate to accumulator

0 0 1 1 0 1 0 w

data

data if w=1

STRING MANIPULATION

REP = Repeat

1 1 1 1 0 0 1 z

MOVS = Move byte/word

1 0 1 0 0 1 0 w

CMPS = Compare byte/word

1 0 1 0 0 1 1 w

SCAS = Scan byte/word

1 0 1 0 1 1 1 w

LODS = Load byte/word to AL/AX

1 0 1 0 1 1 0 w

STOS = Store byte/word from AL/AX

1 0 1 0 1 0 1 w

CONTROL TRANSFER

CALL = Call:

Direct within segment

1 1 1 0 1 0 0 0

IP-INC-LO

IP-INC-HI

Indirect within segment

1 1 1 1 1 1 1 1

 mod  0 1 0 r/m

(DISP-LO)

(DISP-HI)

Direct intersegment

1 0 0 1 1 0 1 0

IP-lo

IP-hi

CS-lo

CS-hi

Indirect intersegment

1 1 1 1 1 1 1 1

 mod  0 1 1 r/m

(DISP-LO)

(DISP-HI)

JMP = Unconditional jump:

Direct within segment

1 1 1 0 1 0 0 1

IP-INC-LO

IP-INC-HI

Direct within segment-short

1 1 1 0 1 0 1 1

IP-INC8

Indirect within segment

1 1 1 1 1 1 1 1

 mod  1 0 0 r/m

(DISP-LO)

(DISP-HI)

Direct intersegment

1 1 1 0 1 0 1 0

IP-lo

IP-hi

CS-lo

CS-hi

Indirect intersegment

1 1 1 1 1 1 1 1

 mod  1 0 1 r/m

(DISP-LO)

(DISP-HI)

RET = Return from CALL:

Within segment

1 1 0 0 0 0 1 1

Within seg adding immed to SP

1 1 0 0 0 0 1 0

data-lo

data-hi

Intersegment

1 1 0 0 1 0 1 1

Intersegment adding immediate to SP

1 1 0 0 1 0 1 0

data-lo

data-hi

JE/JZ = Jump on equal/zero

0 1 1 1 0 1 0 0

IP-INC8

JL/JNGE = Jump on less/not greater or equal

0 1 1 1 1 1 0 0

IP-INC8

JLE/JNG = Jump on less or equal/not greater

0 1 1 1 1 1 1 0

IP-INC8

JB/JNAE = Jump on below/not above or equal

0 1 1 1 0 0 1 0

IP-INC8

JBE/JNA = Jump on below or equal/not above

0 1 1 1 0 1 1 0

IP-INC8

JP/JPE = Jump on parity/parity even

0 1 1 1 1 0 1 0

IP-INC8

JO = Jump on overflow

0 1 1 1 0 0 0 0

IP-INC8

JS = Jump on sign

0 1 1 1 1 0 0 0

IP-INC8

JNE/JNZ = Jump on not equal/not zero

0 1 1 1 0 1 0 1

IP-INC8

JNL/JGE = Jump on not less/greater or equal

0 1 1 1 1 1 0 1

IP-INC8

JNLE/JG = Jump on not less or equal/greater

0 1 1 1 1 1 1 1

IP-INC8

JNB/JAE = Jump on not below/above or equal

0 1 1 1 0 0 1 1

IP-INC8

JNBE/JA = Jump on not below or equal/above

0 1 1 1 0 1 1 1

IP-INC8

JNP/JPO = Jump on not par/par odd

0 1 1 1 0 0 0 1

IP-INC8

JNO = Jump on not overflow

0 1 1 1 0 0 0 1

IP-INC8

JNS = Jump on not sign

0 1 1 1 1 0 0 1

IP-INC8

LOOP = Loop CX times

1 1 1 0 0 0 1 0

IP-INC8

LOOPZ/LOOPE = Loop while zero/equal

1 1 1 0 0 0 0 1

IP-INC8

LOOPNZ/LOOPNE = Loop while not zero/equal

1 1 1 0 0 0 0 0

IP-INC8

JCXZ = Jump on CX zero

1 1 1 0 0 0 1 1

IP-INC8

INT = Interrupt:

Type specified

1 1 0 0 1 1 0 1

DATA-8

Type 3

1 1 0 0 1 1 0 0

INTO = Interrupt on overflow

1 1 0 0 1 1 1 0

IRET = Interrupt return

1 1 0 0 1 1 1 1

PROCESSOR CONTROL

CLC = Clear carry

1 1 1 1 1 0 0 0

CMC = Complement carry

1 1 1 1 0 1 0 1

STC = Set carry

1 1 1 1 1 0 0 1

CLD = Clear direction

1 1 1 1 1 1 0 0

STD = Set direction

1 1 1 1 1 1 0 1

CLI = Clear interrupt

1 1 1 1 1 0 1 0

STI = Set interrupt

1 1 1 1 1 0 1 1

HLT = Halt

1 1 1 1 0 1 0 0

WAIT = Wait

1 0 0 1 1 0 1 1

ESP = Escape (to external device)

1 1 0 1 1 x x x

 mod  y y y r/m

(DISP-LO)

(DISP-HI)

LOCK = Bus lock prefix

1 1 1 1 0 0 0 0

SEGMENT = Override prefix

0 0 1 reg 1 1 0