Assignment 5

,'Nonoverlap block transfer',10
db 10,'1.Block transfer without string '
db 10,'2.Block transfer with string '
db 10,'3.exit '
menumsg_len equ
−
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−menumsgwrmsgdb10,10,
′
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′
,10,10wrmsg
l
​
enequ-wrmsg
bfrmsg db 10,'**Block contents before transfer: '
bfrmsg_len equ
−
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−bfrmsgafrmsgdb10,
′
∗∗Blockcontentsaftertransfer:
′
afrmsg
l
​
enequ-afrmsg
srcmsg db 10,'_Source block contents '
srcmsg_len equ
−
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−srcmsgdstmsgdb10,
′
∗
∗
​
Destinationblockcontents
′
dstmsg
l
​
enequ-dstmsg
srcblk db 01h,02h,03h,04h,05h
dstblk times 5 db 0 ;destination block is defined 5 times
cnt equ 05
spacechar db 20h
lfmsg db 10,10

section .bss
optionbuff resb 02
dispbuff resb 02

%macro dispmsg 2
mov eax,04
mov ebx,01
mov ecx,%1
mov edx,%2
int 80h
%endmacro

%macro accept 2
mov eax,03
mov ebx,00
mov ecx,%1
mov edx,%2
int 80h
%endmacro

section .text
global _start
_start:
dispmsg bfrmsg,bfrmsg_len
call show
menu:
dispmsg menumsg,menumsg_len
accept optionbuff,02
cmp byte [optionbuff],'1'
jne case2
call wos ;wos=With Out String
jmp exit1

case2:
cmp byte [optionbuff],'2'
jne case3
call ws ;ws=with string
jmp exit1

case3:
cmp byte [optionbuff],'3'
je exit
dispmsg wrmsg,wrmsg_len
jmp menu

exit1:
dispmsg afrmsg,afrmsg_len
call show
dispmsg lfmsg,2
exit:
mov eax,01
mov ebx,00
int 80h

dispblk:
mov rcx,cnt

rdisp:
push rcx
mov bl,[esi]
call disp8
inc esi
dispmsg spacechar,1
pop rcx
loop rdisp
ret

wos:
mov esi,srcblk
mov edi,dstblk
mov ecx,cnt
x:
mov al,[esi]
mov [edi],al
inc esi
inc edi
loop x
ret

ws:
mov esi,srcblk
mov edi,dstblk
mov ecx,cnt
cld ;clear direction flag
rep movsb

show:
dispmsg srcmsg,srcmsg_len
mov esi,srcblk
call dispblk
dispmsg dstmsg,dstmsg_len
mov esi,dstblk
call dispblk
ret

disp8:
mov ecx,02
mov edi,dispbuff
dub1:
rol bl,4
mov al,bl
and al,0fh
cmp al,09h
jbe x1
add al,07
x1:
add al,30h
mov [edi],al
inc edi
loop dub1
dispmsg dispbuff,3
ret