UMBC L A N R Y D A B M A L F T U M B C I 1 O M - - PowerPoint PPT Presentation

SLIDE 1 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

1

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

StringOperations. MOVS,LODS,STOS,INS,OUTS Allowdatatransfersofabyte,awordoradoubleword,orifrepeated,a blockofeachofthese. TheDflag-bit(direction),SIandDIareimplicitlyused.

• D=0:AutoincrementDIandSI.

UseCLDinstructiontoclearthisflag.

• D=1:AutodecrementDIandSI.

UseSTDinstructiontosetit. DI: Accessesdataintheextrasegment.CanNOToverride. SI: Accessesdatainthedatasegment.Canbeoverriddenwithsegment

• verrideprefix.

SLIDE 2 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

2

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

StringOperations. LODS: LoadsAL,AXorEAXwithdatastoredatthedatasegment(orextra segment)+offsetgivenbySI. SIisincrementedordecrementedafterwards: STOSB: StoresAL,AXorEAXtotheextrasegment(ES)+offsetgivenbyDI. EScannotbeoverridden. DIisincrementedordecrementedafterwards: LODS

• ✁✂

✁ ✄ ☎ ✆ ✁✝ ✞ ✟ ✠ ✡ ✟ ☛☞ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✑ ✒ ✓

• ✁✂

✁ ✄ ✔

LODSB

☎ ✁✕ ✞ ✟ ✠ ✡ ✟ ☛☞ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✄

LODSD

☎ ✆ ✁✝ ✞ ✟ ✠ ✡ ✟ ☛☞ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✑

doubleword. LODS

✆✟ ✠

• ✁✂

✁ ✄ ☎ ✖✘✗ ✙✚ ✚ ✒ ✛ ✙ ✟ ✜

STOS

• ✁✂

✁ ✄ ☎ ✆✟ ✠ ✡

• ☛☞

✞ ✁✝ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✢ ✒ ✓

• ✁✂

✁ ✄ ✔

STOSB

☎ ✆✟ ✠ ✡

• ☛☞

✞ ✁✕ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✄

STOSD

☎ ✆✟ ✠ ✡

• ☛☞

✞ ✆ ✁✝ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✑

word.

SLIDE 3 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

3

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

StringOperations: LODSW EAX EBX ECX EDX ESP EBP EDI ESI CS DS ES SS

• ✁

✂ ✁ ✄ ☎ ✆

*10H

✝ ✞ ✞ ✞

+

✝ ✞ ✞ ✞

11000

✟ ✞ ✠ ✡ ✟ ✞ ✠ ✡

+/- 2

SLIDE 4 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

4

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

StringOperations. REPprefix: ExecutestheinstructionCXtimes. NOTE:REPdoesnotmakesensewiththeLODSinstruction. CLD

✜

• ✖
• ✆

✕ ✂ ☛✁ ✂

.STARTUP MOV AX

✄ ☎ ✆ ✝ ☎ ☎ ✞

.EXIT END

☎ ✟ ✙ ✟ ✙✠ ✡ ✒☞☛ ✠ ✚ ✙✌ ✙ ☛ ✡ ✌ ✍ ✛ ✙ ✜

.CODE

☎ ✁ ✛ ✛ ✚ ✙✎ ✎ ✗ ✒ ✛ ✙ ✍ ✎ ✙✏ ✆ ✝ ☎ ☎ ✜

MOV ES

✄

AX MOV DI

✄ ☎ ☎ ✖ ✓ ✓ ✎ ✙ ✡ ☎ ✜

MOV CX

✄ ✢ ✑ ✒ ✝ ☎ ☎ ✕ ✍ ✔ ✛ ✠ ✍✓ ☛ ✡ ✜

MOV AX

✄ ☎ ✔ ✢ ☎ ✞ ☎ ✕ ✍ ✔ ✛ ✔ ✡ ✡ ✚ ✒ ✕ ✓ ✡ ✙ ✔ ☛ ✛ ✠ ✖ ✔ ✚ ✜ ✗✘ ✙ ✄✚ ✛ ✄✜ ☎ ✢ ✟ ✙ ✔ ✚ ✡ ✖ ✙ ✎ ✠ ✚ ✙ ✙ ☛ ✜

SLIDE 5 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

5

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

StringOperations. MOVS: Movesabyte,wordordoublewordfromdatasegmentandoffsetSI toextrasegmentandoffsetDI. Increments/decrementsbothDIandSI: INS/OUTS(notavailableonthe8086): Transfersabyte,wordordoublewordofdatafrom/toanI/Odevice into/outoftheextra/datasegment+offsetDI/SI,respectively. TheI/OaddressisstoredintheDXregister. MOVS

✆ ✄ ✄ ✆ ✢ ☎ ✆ ✟ ✠ ✡

• ☛☞

✞ ✟ ✠ ✡ ✟ ☛☞ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✄ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✄

MOVSB

☎ ✆✟ ✠ ✡

• ☛☞

✞ ✟ ✠ ✡ ✟ ☛☞ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✄ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✄

MOVSD

☎ ✆ ✟ ✠ ✡

• ☛☞

✞ ✟ ✠ ✡ ✟ ☛☞ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✑ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✑

• ✁

✄✜ ✂ ✄ ✄ ✂ ✢ ☎ ✆ ✟ ✠ ✡

• ☛☞

✞ ✡

• ✝

☞ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✢ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✢

INSB

☎ ✆✟ ✠ ✡

• ☛☞

✞ ✡

• ✝

☞ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✄

INSD

☎ ✆ ✟ ✠ ✡

• ☛☞

✞ ✡

• ✝

☞ ☎

• ☛

✞

• ☛

✌ ✍✏✎ ✑

OUTSB

☎ ✡

• ✝

☞ ✞ ✟ ✠ ✡ ✟ ☛☞ ☎ ✟ ☛ ✞ ✟ ☛ ✌ ✍✏✎ ✄

SLIDE 6 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

6

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

StringOperations. INSExample: NOTE: Thisassumesthedeviceisabletomakedataavailableatthespeedof theprogram,andinsyncwiththeprogram. Sincethisisalmostnevertrue,thecodeaboveneedstohavea “devicestatuscheck”instruction(s). Ofcourse,theREPprefixcannotbeusedinthiscase. ThesameholdstrueforOUTSinstructions. LEA DI

✄ ✕ ☛ ✟ ✂ ☎ ✁ ✛ ✛ ✚ ✙✎ ✎ ✔ ✚ ✚ ✔

• ✜

MOV DX

✄ ✁ ✁ ✢ ✞ ☎ ✟ ✍ ✌ ✙ ☛ ✍ ✖ ✛ ✙ ✗ ✒ ✠ ✙ ✔ ✛ ✛ ✚ ✙✎ ✎ ✜

MOV CX

✄ ✑ ☎ ✗✘ ✙

• ✁

✄ ✂ ☎ ✄ ✙ ✡ ✡ ✖ ✙ ✛ ✔ ✡ ✔ ✜

... CLD ...

SLIDE 7 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

7

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

MiscellaneousDataTransferOperations. XCHG: Exchangesthecontentsofaregisterwiththecontentsofanyother registerormemorylocation. ItcanNOTexchangesegmentregistersormemory-to-memorydata. Byte,wordanddoublewordscanbeexchangedusinganyaddressing mode(exceptimmediate,ofcourse). XLAT: PerformsatablelookupoperationbyconvertingthevalueinAL fromanindextoavaluestoredinthecellofatableinmemory.

✁ ✂✄

EDX

✄

ESI

☎ ✆✆☎ ✠ ✖ ✔ ☛ ✏ ✙ ✆

• ✝

✔ ☛ ✛ ✆✟ ☛ ✁ ✂✄

AL

✄

• ✁✂

✁ ✢ ☎ ✆ ☎ ✠ ✖ ✔ ☛ ✏ ✙ ✚ ✙✏ ✒ ✎ ✡ ✙✚ ✔ ☛ ✛ ✌ ✙✌ ✍ ✚

• ✗

✔ ✟ ✓ ✙✎ ✜

MOV AL

✄ ✑ ☎ ✕ ✍ ✔ ✛ ✒ ☛ ✛ ✙☎ ✜

XLAT ...

✝ ✘ ✟

BX

✄ ✖✞ ✞ ✟ ✆ ✂ ✂ ✁ ✆ ✕ ✆ ☎ ✆ ✔ ✎ ✙ ✔ ✛ ✛ ✚ ✙ ✎ ✎ ✍ ✓ ✡ ✔ ✕ ✟ ✙ ✜ ☎ ✟ ✟ ✔✠ ✕

• ✡

✙ ✔ ✡ ✁✕ ✌ ✆ ✝ ✌ ✟ ✟ ✒ ✡ ✖ ✁✕ ✜

...

SLIDE 8 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

8

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

MiscellaneousDataTransferOperations. INandOUT: Transfersabyte,wordordoublewordofdatafrom/toanI/Odevice into/outofAL,AXandEAX,respectively. Memoryoperationsarenotavailable(astheyareinINSandOUTS): Twoforms:

• Fixed-portaddressing:

8-bitportnumberencodedininstruction. 8-bitvalueissign-extendedintoaddressbits8-15. Addressbits16-31areundefined.

• Variable-portaddressing:

16-bitportnumberstoredinDX.

• ✁

AL

✄ ✠ ✝ ☎ ✝ ✎ ✕ ✒ ✡ ✎ ✔ ✚ ✙ ✎ ✔ ✗ ✙ ✛ ✡ ✍ ✁✕ ✓ ✚ ✍ ✌ ☛ ✍ ✖ ✠ ✍ ✚ ✡ ✠ ✝ ✜

• ✁

EAX

✄ ✠ ✝ ☎ ✁ ✢ ✎ ✕ ✒ ✡ ✎ ✔ ✚ ✙ ✎ ✔ ✗ ✙ ✛ ✡ ✍ ✆ ✁✝ ✜ ✛

• ✚

DX

✄

EAX

☎ ✁ ✢ ✎ ✕ ✒ ✡ ✎ ✔ ✚ ✙ ✟ ✚ ✒ ✡ ✡ ✙ ☛ ✡ ✍ ✠ ✍ ✚ ✡

• ✝

✓ ✚ ✍ ✌ ✆ ✁✝ ✜

SLIDE 9 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

9

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

MiscellaneousDataTransferOperations. INandOUTExample: Notethattheoldcontentsofthehigher-orderbitpositionsoftheportare preserved. IN AL

✄

• ✄

✞ ✜

• ✖
• ✆

✕ ✂ ☛✁ ✂

.STARTUP OR AL

✄ ✁

.EXIT END

☎ ✁ ✙ ✔ ✛ ✠ ✍ ✚ ✡

• ✄

✞ ✂ ✎ ✠ ✙ ✔ ✄ ✙✚ ☎ ✜

.CODE

☎ ✟ ✙ ✡ ✚ ✒ ✏ ✖ ✡ ✌ ✍ ✎ ✡ ✡ ✟ ✍ ✕ ✒ ✡ ✎ ✜

OUT

• ✄

✞ ✄

AL LOOP

✕ ✄ ☎ ✂ ✒ ✌ ✙ ✛ ✙ ✟ ✔

• ✜

IN AL

✄

• ✄

✞ ☎ ✁ ✙ ✔ ✛ ✠ ✍ ✚ ✡

• ✄

✞ ✜

AND AL

✄ ☎ ✞ ✢ ✞ ☎ ✢ ✟ ✙ ✔ ✚ ✚ ✒ ✏ ✖ ✡ ✌ ✍ ✎ ✡ ✡ ✟ ✍ ✕ ✒ ✡ ✎ ✜ ✛

• ✚
• ✄

✞ ✄

AL

☎ ✟ ✠ ✙ ✔ ✄ ✙✚ ✍ ✓ ✓ ✜ ☎ ✂ ✓ ✚ ☛ ✍ ☛ ✡ ✖ ✙ ✎ ✠ ✙ ✔ ✄ ✙✚ ✜

MOV CX

✄ ✄ ☎ ☎ ☎ ✞ ☎

• ✙

✟ ✔

• ✠

✍✓ ☛ ✡ ✜

L1:

SLIDE 10 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

10

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

MiscellaneousDataTransferOperations. MOVSXandMOVZX(80386anduponly): Move-and-sign-extendandMove-and-zero-extend: BSWAP(80486anduponly): Swapsthefirstbytewiththeforth,andthesecondbytewiththe third. Usedtoconvertbetweenlittleendianandbigendian:

• ✛✁

✄

• CX

✄

BL

☎ ✟ ✒ ✏ ☛ ✎ ✙☎ ✡ ✙ ☛ ✛ ✎ ✆ ✕ ✒ ☛ ✡ ✍ ✢ ✝

• ✛✁

✂

• EAX

✄

• ✁✂

✁ ✢ ☎ ✄ ✙✚ ✍ ✙☎ ✡ ✙ ☛ ✛ ✎ ✟ ✍ ✚ ✛ ✔ ✡

• ✁✂

✁ ✢ ✒ ☛ ✆ ✆ ☎ ✜ ✂ ✄✜ ✟ ✙

EAX EAX EBX ECX EDX

✡ ✡ ✠ ✠ ✞ ✞ ✝ ✝ ✝ ✝ ✞ ✞ ✠ ✠ ✡ ✡

SLIDE 11 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

11

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6 ✬✎✭ ✮✠✯ ✰✱ ✲ ✲ ✯ ✳ ✴ ✰✎✵

MiscellaneousDataTransferOperations. CMOV(Pentiumanduponly): Theseinstructionsmovedataonlyifaconditionistrue. ConditionsaresetbyapreviousinstructionandincludeCarry,Zero, Sign,OverflowandParity: Therearemanyvariationsofthisinstruction. SeeAppendixBoftext.

✁

• ✛✁

✂

AX

✄

BX

☎

• ✍

✗ ✙ ✒ ✓ ✄ ✙✚ ✍ ✓ ✟ ✔ ✏ ✒ ✎ ✎ ✙ ✡ ✙ ✟ ✎ ✙ ✛ ✍

nothing.

SLIDE 12 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

12

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6

IntelAssembly SegmentOverridePrefix: Allowstheprogrammertooverridethedefaultsegment. Appendsanadditionalbytetothefrontofaninstruction. JumpandCallinstructionscannotbeprefixed,mustuseCS. AssemblerDirectives: MOV AX

✄ ✡

DI]

☎ ✁ ✎ ✎ ✓ ✌ ✙✎ ✟

MOV AX

✄ ✆ ✟ ✠ ✡

DI]

☎ ✖✘✗ ✙✚ ✚ ✒ ✛ ✙ ✟ ✒ ✡ ✖ ✆✟

LISTB

• ✆

✄ ☎

• ☎

✂ ✢ ☎ ☎ ☛ ☛ ✒ ✡ ✒ ✔ ✟ ✒✂✁ ✙✎ ✄ ☎ ✕

• ✡

✙✎ ✡ ✍ ☎ ✢ ✞ ✜

LISTA

• ✆

✄ ☎ ✁ ✎ ✎ ✒ ✏ ☛ ✎ ☎ ✡ ✍ ✡ ✖ ✙ ✕

• ✡

✙ ✜ ✟ ✝

• ✄

✁

2

☎ ☎ ✟ ✔ ✠ ✙ ✛ ✔ ✡ ✔ ✍ ☛ ✔ ✟ ✍ ✚ ✛ ✕ ✍✓ ☛ ✛ ✔ ✚

• ✜

TEN

✘ ☎

• 10

☎

• ✙✠

✖ ✔ ☛ ✒ ✎ ✌ ✓ ✍ ✚ ✛ ✙ ✓ ✒ ☛ ✒ ☛ ✏ ✠ ✍ ☛ ✎ ✡

DATA1

✘ ☎

• ✂

✞ ☛ ✟ ✆ ✂ ✂ ✆ ☎ ✁ ✎ ✎ ✒ ✏ ☛ ✔ ✕

• ✡

✙ ✟ ✔ ✕ ✟ ✙ ✡ ✍ ✔ ✟ ✍ ✚ ✛

DATA_SEG

✄ ✘ ✄ ✘ ✁ ✚ ☎

• ✙

✓ ✒ ☛ ✙ ✔ ✎ ✙ ✏ ✌ ✙ ☛ ✡ ✜ ✟ ✄ ✄

• ✘

CS:CODE_SEG

☎ ✂ ✙ ✟ ✟ ✔ ✎ ✎ ✙✌ ✕ ✟ ✙✚ ☛ ✔ ✌ ✙ ✡ ✍ ✓ ✎ ✙ ☎ ✓ ✍ ✚ ✢ ✟

SLIDE 13 ✂✁ ✄ ☎ ✆ ✝ ✄ ✞✠✟✡ ☛ ✟☞ ✝ ✝ ✌✎✍ ☛ ✏✑ ✒ ✏✓ ✔ ✄ ✄ ✆ ✝ ✕✖ ✁ ✗ ✘ ✙ ✞✚ ✛✜ ✑

13

✢ ✔✎✣ ✟ ✌ ✖✤ ✑✦✥ ✤ ✑ ✑ ✜ ✧✎★ ✩✪ ☞ ✝ ✫

UMBC

U M B C U N I V E R S I T Y O F M A R Y L A N D B A L T I M O R E C O U N T Y 1 9 6 6

IntelAssembly AssemblerDirectives: FullSegmentDefinitions: ADD BX

✄

CX

☎ ✁ ✖ ✢ ✄ ✙ ✗ ✛ ✁

• ✟

✗ ☎

• ✙

✓ ✒ ☛ ✙ ✔ ✠ ✚ ✍ ✠ ✙ ✛ ✓ ✚ ✙ ✜

ADD BX

✄

DX ADD AX

✄

BX RET

☎ ✁ ✖ ✢ ✄ ✆ ✁

• ☎

✟ ✂ ✁ ✢✁ ✂ ✟ ✆ ✄ ✄ ✘ ✄ ✘ ✁ ✚ ✄✚ ✟ ✁ ✄ ☎

• ✙

✓ ✒ ☛ ✙ ✡ ✖ ✙ ✎ ✡ ✔ ✠ ✄ ✟ ✂ ✁ ✢✁ ✂ ✟ ✆ ✄

ENDS

• ✁✂

✁ ✂ ✟ ✆ ✄

SEGMENT

☎

• ✁✂

✁ ✆

...

✝✞ ✟ ✞ ✠✡ ☛

ENDS

...

✢ ✖

• ✆

✂ ✟ ✆ ✄ ✄ ✘ ✄ ✘ ✁ ✚

• ✄

✘ ✝☞

‘CODE’

✌✍ ✝ ✡ ✎ ✠ ✡ ☛

ENDS

... ASSUME

✢ ✟ ✠ ✢ ✖

• ✆

✂ ✟ ✆ ✄ ✄ ✟ ✠

• ✁✂

✁ ✂ ✟ ✆ ✄ ✄ ✟ ✟ ✠ ✟ ✂ ✁ ✢✁ ✂ ✟ ✆ ✄