111 lines
2.2 KiB
NASM
111 lines
2.2 KiB
NASM
|
; THIS CODE HAS BEEN TESTED AND IS FULLY OPERATIONAL.
|
||
|
|
|
||
|
|
; Problem Statement: Write X86/64 ALP to perform overlapped block transfer (WITHOUT string specific instructions). Block containing data can be defined in the data segment.
|
||
|
|
|
||
|
|
; Code from Microprocessor (SPPU - Second Year - Computer Engineering - Content) repository on KSKA Git: https://git.kska.io/sppu-se-comp-content/Microprocessor/
|
||
|
|
|
||
|
|
|
||
|
|
; BEGINNING OF CODE
|
||
|
|
%macro print 2 ; Defined macro for printing messages 2 stand for the parameters
|
||
|
|
mov rax,1 ; For system write specifier
|
||
|
|
mov rdi,1 ; Standard output
|
||
|
|
mov rsi,%1
|
||
|
|
mov rdx,%2
|
||
|
|
syscall
|
||
|
|
%endmacro
|
||
|
|
|
||
|
|
section .data
|
||
|
|
m1 db 10,"source block",10,13 ; 10 stands for new line and 13 stands for tab
|
||
|
|
m1len equ $-m1
|
||
|
|
|
||
|
|
m2 db 10,"destination block after transfer:",10,13
|
||
|
|
m2len equ $-m2
|
||
|
|
|
||
|
|
space db " "
|
||
|
|
spacelen equ $-space
|
||
|
|
|
||
|
|
srcblk db 10h,20h,30h,40h,50h ; srcblk defined for the functioning
|
||
|
|
count equ 05h ; count initialized to 5
|
||
|
|
|
||
|
|
section .bss
|
||
|
|
ans resb 4 ; ans block is defined for storing the transformed value of the numbers from hexa to ascii
|
||
|
|
dstblk resb 5 ; dstblk is our destination block
|
||
|
|
|
||
|
|
section .text ; This section is necessary for assembler understanding
|
||
|
|
global _start
|
||
|
|
_start:
|
||
|
|
print m1,m1len
|
||
|
|
mov rsi,srcblk ; rsi now points to the first location of the source block
|
||
|
|
call disp_block ; Calling the procedure for displaying the source block
|
||
|
|
|
||
|
|
print m2,m2len
|
||
|
|
|
||
|
|
mov rsi,srcblk ; Now the rsi points to the source block
|
||
|
|
mov rdi,dstblk ; Now the destination pointer points to the first memory location of the destination block
|
||
|
|
mov rcx,02 ; rcx is the register used for the counter purpose
|
||
|
|
|
||
|
|
s1: mov al,[rsi]
|
||
|
|
mov [rdi],al
|
||
|
|
inc rsi
|
||
|
|
inc rdi
|
||
|
|
loop s1
|
||
|
|
mov rsi,srcblk
|
||
|
|
mov rcx,03
|
||
|
|
|
||
|
|
s2: mov al,[rsi]
|
||
|
|
mov [rdi],al
|
||
|
|
inc rsi
|
||
|
|
inc rdi
|
||
|
|
loop s2
|
||
|
|
|
||
|
|
mov rsi,dstblk
|
||
|
|
call disp_block
|
||
|
|
|
||
|
|
mov rax,60
|
||
|
|
xor rdi,rdi
|
||
|
|
syscall
|
||
|
|
|
||
|
|
disp_block:
|
||
|
|
mov rbp,count
|
||
|
|
|
||
|
|
back:
|
||
|
|
mov al,[rsi]
|
||
|
|
push rsi
|
||
|
|
call disp_8
|
||
|
|
print space,1
|
||
|
|
pop rsi
|
||
|
|
inc rsi
|
||
|
|
dec rbp
|
||
|
|
jnz back
|
||
|
|
ret
|
||
|
|
|
||
|
|
disp_8:
|
||
|
|
mov rsi,ans
|
||
|
|
|
||
|
|
mov bl,al
|
||
|
|
mov dl,bl
|
||
|
|
rol dl,04
|
||
|
|
and dl,0fh
|
||
|
|
cmp dl,09h
|
||
|
|
jbe add30
|
||
|
|
add dl,07h
|
||
|
|
|
||
|
|
add30:
|
||
|
|
add dl,30h
|
||
|
|
mov [rsi],dl
|
||
|
|
inc rsi
|
||
|
|
|
||
|
|
mov dl,bl
|
||
|
|
and dl,0fh
|
||
|
|
cmp dl,09h
|
||
|
|
jbe add130
|
||
|
|
add dl,07h
|
||
|
|
|
||
|
|
add130:
|
||
|
|
add dl,30h
|
||
|
|
mov [rsi],dl
|
||
|
|
|
||
|
|
print ans,2
|
||
|
|
ret
|
||
|
|
; END OF CODE
|