riistvarapõhine programmeerimine loeng 7 protseduurid katkestused tsüklid

Riistvarapõhine programmeerimine

Loeng 7ProtseduuridKatkestusedTsüklid

28/07/2004 ID218 Riistvaralähedane programmeerimine

2

Protseduurid

Call

Ret


3

Call INear:

call disp16 ;direct, 16 bit relative

call mem16 ;indirect, 16 bit memory pointer

call reg16 ;indirect, 16 bit register

pointer

Far:

call adrs32 ;direct, 32 bit segmented address

call mem32 ;indirect, 32 bit memory pointer


4

Call II

Far Call CS -> stack IP -> stack Uus segment -> CS Uus IP -> IP


5

Call III

Near Call IP -> stack Uus IP -> IP


6

Call IV

call disp16

Sub1 proc near

ret

Sub1 endp

. . . . . .

call Sub1


7

Call V

call mem16

SubPtr1 word Sub1

. . . . . .

Sub1 proc near

ret

Sub1 endp

. . . . . .

call SubPtr1


8

Call VI

call reg16

Sub1 proc nearret

Sub1 endp. . . . . . lea cx, Sub1call cx


9

Call VII

call disp32

Sub2 proc far

ret

Sub2 endp

. . . . . .

call Sub2


10

Call VIII

call mem32

SubPtr1 dword Sub2

. . . . . .

Sub2 proc far

ret

Sub2 endp

. . . . . .

call SubPtr2


11

Call IX

call 2[bx]

call Variable [bx]

call [bx][si]

call Variable[bx][si]

Erinevad adresseerimisviisid lubatud


12

Ret I

pop ax

jmp ax


13

Ret II

Near:Ret (Retn)

pop IP

FarRetf

pop CSpop IP


14

Ret IIISub: push ax

push bx..pop bxret...call Sub


15

Ret IV

Stack (pinu):

Call Sub Ret

IP Bx Ax Ax IPIP

Ax IP IP

IP


16

Ret VRet const

Sub: proc. . .ret 2endp. . .

push param1push param2call Sub


17

Ret VI

Ret 2

Call Sub Ret 2

IP IP Value1

Param2 Param2

Param1 Param1

Value1 Value1


18

Katkestused I

Int

Iret


19

Katkestused II

int nn

0 < nn < 255

nn Interrupt vector

Interrupt Vector Table


20

Katkestused III

MS-DOS interrupt 21h

ah - function code

mov ah, 4Ch ;DOS terminate code

int 21h ;DOS call


21

Katkestused V


22

Katkestused VIBIOS:Int 5 Print Screen operation. Int 10h Video display services. Int 11h Equipment determination. Int 12h Memory size determination. Int 13h Diskette and hard disk services.Int 14h Serial I/O services.Int 15h Miscellaneous services.Int 16h Keyboard services.Int 17h Printer services.Int 18h BASIC.Int 19h Reboot.Int 1Ah Real time clock services.


23

Katkestused VIIPutChar prints the character in the AL register to the display.

PutChar proc

push ax ;Preserve value in AH

mov ah, 0eh ;BIOS call to print a ;character.

int 10h

pop ax ;Restore AH's value.

ret

PutChar endp


24

Katkestused VIIIGetChar reads a single key from the keyboard and

puts it in the AL register.

GetChar proc

mov ah, 0 ;BIOS call to read a ;key.

int 16h

ret

GetChar endp


25

Katkestused IXINT Call

2 bytes 2-6 bytes

Push far return Push return

Push flags

Iret

ret

popf


26

Tsüklid I

LoopLoopeLoopneLoopzLoopnz


27

Tsüklid II

Loop:Dec cxJnz lbl

Cx - 65 536 korda

Ei mõjuta lipud


28

Tsüklid IIImov cx, 255

ArrayLp: mov Array[cx], cl

loop ArrayLp

mov Array[0], 0

Array = 0, 1, 2, 3, . . .


29

Tsüklid VILOOPE/LOOPZ

cx := cx - 1

if ZeroFlag = 1 and cx != 0, goto target

Ei mõjuta lipud

Aeglane


30

Tsüklid VIIOtsime massiivist nullist erineva elemendi:

mov cx, 16 ;Max 16 array elements.mov bx, -1 ;Index into the array (note

;next inc).SearchLp: inc bx ;Move on to next array

;element.cmp Array[bx], 0 ;See if this element

;is zero.loope SearchLp ;Repeat if it is.je AllZero ;Jump if all elements

;were zero.AllZero: . . .


31

Tsüklid VIIILOOPNE/LOOPNZ

cx := cx - 1

if ZeroFlag = 0 and cx 0, goto target

Ei mõjuta lipud

Aeglane


32

Tsüklid IXOtsime massiivist null-elemendi:

mov cx, 16 ;Maximum # of array ;elements.

mov bx, -1 ;Index into array.

LN0: inc bx ;Move on to next array ;element.

cmp Array[bx],0 ;Does this element ;contain zero?

loopne LN0 ;Quit if it does, or ;more than 16 bytes.


33

Tsüklid X

Ootame, millal välisoperatsioon lõpeb, seda näitab pordi 379h bit 7.

mov dx, 379h

WaitNBusy: in al, dx ;Get port

test al, 80h ;See if bit #7 is one

jne WaitNBusy ;Wait for “not busy”


34

Tsüklid XI

Ootame, millal välisoperatsioon lõpeb, seda näitab pordi 379h bit 7.

mov dx, 379h ;Input port addressmov cx, 0 ;Loop 65,536 times and

;then quit.WaitNBusy: in al, dx ;Get data at port.

test al, 80h ;See if busyloopne WaitNBusy ;Repeat if busy and no

;time out.jne TimedOut ;Branch if CX=0 because

;we timed out.


35

Tsüklid XIIWHILE boolean expression DO statement;

I := 0;WHILE (I<100) do I := I + 1;

mov I, 0WhileLp: cmp I, 100

jge WhileDoneinc Ijmp WhileLp

WhileDone:


36

Tsüklid XIIILOOP Loop. ... EndLoopREAD(ch)IF ch = ‘.’ THEN BREAK;WRITE(ch);ENDLOOP;

LOOP1: call getcharcmp al, ‘.’je EndLoopcall putcharjmp LOOP1

EndLoop:


37

Tsüklid XIVFOR var := start TO stop DO stmt;

FOR I := 0 to 7 do write(ch);

mov cx, 7

LP: mov al, ch

call putcchar

loop LP


38

Tsüklid XV

mov cx, 8

Loop1: mov cx, 4

Loop2: stmts

loop Loop2

. . . . .

loop Loop1

Vale!!!


39

Tsüklid XVImov cx, 8

Loop1: push cxmov cx, 4

Loop2: . . . . . loop Loop2pop cx. . . . . loop Loop1

Õige !!!


40

Kokkuvõte I

Protseduurid:Call

Procretendp


41

Kokkuvõte II

Katkestused:Int nniret


42

Kokkuvõte III

Tsükklid:LoopLoopeLoopzLoopneLoopnz

riistvarapõhine programmeerimine loeng 7 protseduurid katkestused tsüklid

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