פרק 6 המחסנית ותת תכניות
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Transcript of פרק 6 המחסנית ותת תכניות
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–
stack
LIFO
LastInFirstOut
10h
(stack segment)
SS
SS
000F
000E
000D
000C
000B
000A
12h000F
34h000E
00h000D
7Fh000C
000B
000A
F
000F
000E
000D
000C
000B
000A
––
1234h-7Fh
–SP
SP10h
000Ch
12h000F
34h000E
00h000D
7Fh000C
000B
000A
tos
bos
push
opndPUSH
SP
-
-
pop
opndPOP
SP
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'-–-
(stack over/underflow)
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•
•
•
•
label:
•
•
-
•
ret
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CALL label
-label
call
•callIP
•IP
•
-ret
call
ret
IP
-end
א-
AH-ALAH
-AL
ב-
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.1
.2
.3
.model small
.stack 100h
.data
.code
begin: mov ax, @data
mov ds , as
mov ah,[50h]mov bh,[51h]mov ch,[52h]mov dh,[53h]call add_numbers
sof: mov ah,4ch
Int 21h
add_numbers: mov dl, 0 -
add dl, ahadd dl, bhadd dl, chadd dl, dhret
end
.model small
.stack 100h
.data
.code
mov ax, @datamov ds , as
begin: call add_numberssof: mov ah,4ch
Int 21h
add_numbers: mov ah,[50h] -
mov bh,[51h]mov ch,[52h]mov dh,[53h]mov dl, 0add dl, ahadd dl, bhadd dl, chadd dl, dhret
end
.model small
.stack 100h
.data
x db 5y db 10z db 20w db 17sum db 0.codemov ax, @datamov ds , as
begin: call add_numberssof: mov ah,4ch
Int 21h
add_numbers: mov ah, 0 -
add ah , xadd ah, yadd ah, zadd ah, wmov sum, ahret
end
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•-
.model small
.stack 100h
.data
.codemov ax, @datamov ds , as
begin: mov ah ,0mov al, [50h]push axmov al, [51h]push axmov al, [52h]push axmov al, [53h]push axcall add_numbers
sof: mov ah,4ch
Int 21h
add_numbers: pop bx -
pop axpop dxadd dl, alpop axadd dl, alpop axadd dl, alpush bxret
end
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2050h
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