Assignment 10
;Write X86/64 ALP to perform multiplication of two 8-bit hexadecimal numbers. Use
;successive addition and add and shift method. (use of 64-bit registers is expected).
section .data
msg db 'Enter two digit Number::',0xa
msg_len equ -res
choice db 'Enter your Choice:',0xa
db'1.Successive Addition',0xa
db '2.Add and Shift method',0xa
db '3.Exit',0xa
choice_len equ $-choice
section .bss
num resb 03
num1 resb 01
result resb 04
cho resb 2
section .text
global _start
_start:
xor rax,rax
xor rbx,rbx
xor rcx,rcx
xor rdx,rdx
mov byte[result],0
mov byte[num],0
mov byte[num1],0
mov rax,1
mov rdi,1
mov rsi,choice
mov rdx,choice_len
syscall
mov rax,0 ;; read choice
mov rdi,0
mov rsi,cho
mov rdx,2
syscall
cmp byte[cho],31h ;; comparing choice
je a
cmp byte[cho],32h
je b
jmp exit
a: call Succe_addition
jmp _start
b: call Add_shift
jmp _start
exit:
mov rax,60
mov rdi,0
syscall
convert: ;; ASCII to Hex conversion
xor rbx,rbx
xor rcx,rcx
xor rax,rax
mov rcx,02
mov rsi,num
up1:
rol bl,04
mov al,[rsi]
cmp al,39h
jbe p1
sub al,07h
jmp p2
p1: sub al,30h
p2: add bl,al
inc rsi
loop up1
ret
display: ;; Hex to ASCII conversion
mov rcx,4
mov rdi,result
dup1:
rol bx,4
mov al,bl
and al,0fh
cmp al,09h
jbe p3
add al,07h
jmp p4
p3: add al,30h
p4:mov [rdi],al
inc rdi
loop dup1
mov rax,1
mov rdi,1
mov rsi,result
mov rdx,4
syscall
ret
Succe_addition:
mov rax,1
mov rdi,1
mov rsi,msg ;print for num1
mov rdx,msg_len
syscall
mov rax,0
mov rdi,0
mov rsi,num ;Read num 1
mov rdx,3
syscall
call convert ;convert to hex from ascii
mov [num1],bl
mov rax,1
mov rdi,1
mov rsi,msg
mov rdx,msg_len ;msg for 2nd number
syscall
mov rax,0
mov rdi,0 ;Read 2nd number
mov rsi,num
mov rdx,3
syscall
call convert ;convert 2nd number to hex
xor rcx,rcx
xor rax,rax
mov rax,[num1]
repet:
add rcx,rax
dec bl
jnz repet
mov [result],rcx
mov rax,1
mov rdi,1
mov rsi,res
mov rdx,res_len
syscall
mov rbx,[result]
call display
ret
Add_shift:
mov rax,1
mov rdi,1
mov rsi,msg
mov rdx,msg_len
syscall
mov rax,0
mov rdi,0
mov rsi,num
mov rdx,3
syscall
call convert
mov [num1],bl
mov rax,1
mov rdi,1
mov rsi,msg
mov rdx,msg_len
syscall
mov rax,0
mov rdi,0
mov rsi,num
mov rdx,3
syscall
call convert
mov [num],bl
xor rbx,rbx
xor rcx,rcx
xor rdx,rdx
xor rax,rax
mov dl,08
mov al,[num1]
mov bl,[num]
p11:
shr bx,01
jnc p
add cx,ax
p:
shl ax,01
dec dl
jnz p11
mov [result],rcx
mov rax,1
mov rdi,1
mov rsi,res
mov rdx,res_len
syscall
;dispmsg res,res_len
mov rbx,[result]
call display
ret