 section .data
    text1 db "Enter first number : ", 0
    text2 db "Enter second number : ", 0
    text3 db "Enter third number : ", 0 
    
section .bss
    onenum resb 16
    twonum resb 16
    threenum resb 16
    temp resb 16

section .text
    global _start

_start:
    
    call _printText1        ;Print text1
    call _getnumone         ;Get num 1
    call _printText2        ;Print text2
    call _getnumtwo         ;Get num 2
    call _printText3        ;Print text3
    call _getnumthree       ;Get num 3
    
    call _printnumone       ;Print number1
    call _printnumtwo       ;Print number2
    call _printnumthree     ;Print number3
    
    mov rax, 60
    mov rdi, 0
    syscall

_getnumone:                 ;Function start here
    
    mov rax, 0 
    mov rdi, 0 
    mov rsi, onenum
    mov rdx, 16
    syscall
    ret
    
_getnumtwo:
    
    mov rax, 0 
    mov rdi, 0 
    mov rsi, twonum
    mov rdx, 16
    syscall
    ret
    
_getnumthree:
    
    mov rax, 0 
    mov rdi, 0 
    mov rsi, threenum
    mov rdx, 16
    syscall
    ret
    
_printText1:
    
    mov rax, 1
    mov rdi, 1
    mov rsi, text1
    mov rdx, 21
    syscall
    ret
    
_printText2:
    
    mov rax, 1
    mov rdi, 1
    mov rsi, text2
    mov rdx, 22
    syscall
    ret
    
_printText3:
    
    mov rax, 1
    mov rdi, 1
    mov rsi, text3
    mov rdx, 21
    syscall
    ret
    
_printnumone:

    mov rax, 1
    mov rdi, 1
    mov rsi, onenum
    mov rdx, 16
    syscall
    ret
    
_printnumtwo:

    mov rax, 1
    mov rdi, 1
    mov rsi, twonum
    mov rdx, 16
    syscall
    ret
    
_printnumthree:

    mov rax, 1
    mov rdi, 1
    mov rsi, threenum
    mov rdx, 16
    syscall
    ret

created 4 years ago by Heartties Heart

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