 section .data
msg db &#39;Enter two digit Number::&#39;,0xa
msg_len equ $-msg
res db 10,&#39;Multiplication of elements is::&#39;
res_len equ $-res
choice db &#39;Enter your Choice:&#39;,0xa
db&#39;1.Successive Addition&#39;,0xa
db &#39;2.Add and Shift method&#39;,0xa
db &#39;3.Exit&#39;,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
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
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

created 1 year ago by Sakshi Gangurde

Assembly Online Compiler

Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.

About Assembly

Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.

Every assembler may have it's own assembly language designed for a specific computers or an operating system.

Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.

Syntax help

Assembly language usually consists of three sections,

Data section

To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section

To declare variables
text section

_start specifies the starting of this section where the actually code is written.

Variables

There are various define directives to allocate space for variables for both initialized and uninitialized data.

1. To allocate storage space to Initialized data

Syntax

variable-name    define-directive    initial-value

Define Directive	Description	Allocated Space
DB	Define Byte	1 byte
DW	Define Word	2 bytes
DD	Define Doubleword	4 bytes
DQ	Define Quadword	8 bytes
DT	Define Ten Bytes	10 bytes

2. To allocate storage space to un-initialized data

Define Directive	Description
RESB	Reserve a Byte
RESW	Reserve a Word
RESD	Reserve a Doubleword
RESQ	Reserve a Quadword
REST	Reserve a Ten Bytes

Constants

Constants can be defined using

1. equ

To define numeric constants

CONSTANT_NAME EQU regular-exp or value

2. %assign

To define numeric constants.

%assign constant_name value

3. %define

To define numeric or string constants.

%define constant_name value

Loops

Loops are used to iterate a set of statements for a specific number of times.

mov ECX,n
L1:
;<loop body>
loop L1

where n specifies the no of times loops should iterate.

Procedures

Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

procedure_name:
   ;procedure body
   ret