Write X86/64 ALP to perform multiplication of two 8-bit hexadecimal numbers. Use successive addition and add and shift method.

Second Year Computer Engineering Microprocessor Programs:

Microprocessor Lab:

Practicle 4:
       Write X86/64 Assembly Language Program (ALP) to perform multiplication of two 8-bit hexadecimal numbers. Use successive addition and add and shift method.

 ----------------------------------------------------------------------------------------------------------------------------------
%macro print 2  
mov rax,1 ; sys_out
mov rdi,1 ; sys_std_output
mov rsi,%1
mov rdx,%2
Syscall
%endmacro
%macro getch 1  
mov rax,0 ; sys_in
mov rdi,0 ; sys_std_input
mov rsi,%1
mov rdx,1
Syscall
%endmacro
%macro exitprog 0
mov rax, 60
xor rdi,rdi
syscall
%endmacro

 section .data
nwline db 10
m0 db 10,13,"Program to calculate factorial of a given number",10,10
l0 equ $-m0
m2 db 10,"Enter Number (2 digit HEX no) : "
l2 equ $-m2
m4 db 10,"The factorial is : "
l4 equ $-m4
factorial  dq 1

 section .bss
no1 resq 1
input resb 1
output resb 1

 section .text
global _start
_start :

 print m0,l0

 print m2,l2    ; Display message
call getnum

 mov [no1],rax     ; Accept number
getch input ; To read and discard ENTER key

 mov rcx,[no1]

 call facto
mov rax,00

 print m4,l4
mov rax, qword[factorial]

 call disphx16    ; displays a 8 digit hex number   ;in rax
exitprog

 facto:
push rcx
cmp rcx,01
jne ahead
jmp exit2

 ahead: dec rcx

call facto

 exit2: pop rcx
mov rax,rcx
mul qword[factorial]
mov qword[factorial],rax
ret
; Procedure to get a 2 digit hex no from user
; number returned in rax

 getnum:
mov cx,0204h
mov rbx,0

 ll2:
push rcx ; syscall destroys rcx. Rest all regs are preserved
getch input
pop rcx
mov rax,0
mov al,byte[input]
sub rax,30h
cmp rax,09h
jbe skip1
sub rax,7

 skip1:
shl rbx,cl
add rbx,rax
dec ch
jnz ll2
mov rax,rbx
ret

 disphx16:   ; displays a 16 digit hex number ;passed in rax
mov rbx,rax
mov cx,1004h ;16 digits to display and 04 count ;to rotate

 ll6:
rol rbx,cl
mov rdx,rbx
and rdx,0fh
add rdx,30h
cmp rdx,039h
jbe skip4
add rdx,7

 skip4:
mov byte[output],dl
push rcx
print output,1
pop rcx
dec ch
jnz ll6
ret

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