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X86/64 ALP Non-Overlapped Block Transfer

The document outlines an assignment to write an X86/64 assembly language program for non-overlapped block transfer without using string-specific instructions. It includes a code segment that defines a source block of data, a destination block, and macros for writing messages to the output. The program demonstrates the transfer of data from the source to the destination block and displays the contents before and after the transfer.

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18 views3 pages

X86/64 ALP Non-Overlapped Block Transfer

The document outlines an assignment to write an X86/64 assembly language program for non-overlapped block transfer without using string-specific instructions. It includes a code segment that defines a source block of data, a destination block, and macros for writing messages to the output. The program demonstrates the transfer of data from the source to the destination block and displays the contents before and after the transfer.

Uploaded by

rock23star04
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Assignment No : - 08

Name:-Amey Bagal
Roll No.:-SCOA08
Batch:-S1

Aim:- Write X86/64 ALP to perform non-overlapped block transfer without string specific
instructions. Block containing data can be defined in the data segment.

Code:

section .data sourceBlock db 12h,45h,87h,24h,97h count equ 05 msg db


"ALP for non overlapped block transfer using
string instructions :

",10 msg_len
equ $ - msg msgSource db 10,"The source block contains the elements : ",10
msgSource_len equ $ - msgSource msgDest db 10,10,"The destination block contains the
elements : ",10 msgDest_len equ $ - msgDest bef db 10, "Before Block Transfer : ",10 beflen
equ $ - bef aft db 10,10 ,"After Block Transfer : ",10 aftlen equ $ - aft section .bss
destBlock resb 5 result resb 4

%macro write 2 mov rax,1


mov
rdi,1 mov rsi,%1
mov rdx,%2
syscall
%endmacro

section .text global _start


_start:

write msg , msg_len write bef

, beflen

write msgSource , msgSource_len mov


rsi,sourceBlock call dispBlock

write msgDest , msgDest_len mov


rsi,destBlock call dispBlock
mov rsi,sourceBlock
mov rdi,destBlock
mov rcx, count cld
rep movsb write
aft , aftlen write
msgSource ,
msgSource_len
mov
rsi,sourceBlock call dispBlock

write msgDest , msgDest_len mov


rsi,destBlock call dispBlock

mov rax,60 mov


rdi,0 syscall

dispBlock: mov
rbp,count
next:mov al,[rsi]
push rsi call disp
pop rsi inc rsi
dec rbp jnz next
ret disp:
mov bl,al ;store number in bl mov rdi, result ;point
rdi to result variable mov cx,02
;load count of rotation in cl up1: rol bl,04 ;rotate
number left by four bits mov al,bl ;move lower byte in
dl and al,0fh ; get only LSB cmp al,09h ;compare with
39h jg add_37 ;if grater than 39h skip add 37 add
al,30h jmp skip1 ;else add 30 add_37: add al,37h
skip1: mov [rdi],al ;store ascii code in result variable
inc rdi
;point to next byte dec cx ;decrement the count of digits
to display
jnz up1 ;if not zero jump to repeat write
result , 4 ret

Output:

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