Assembly language is low level programming or other programmable device specific to a particular computer archeticture in contrast to most high level programming languages, which are generally portable across multiple systems.

This code can be compiled using nasm or netwide assembler so you should be using specific commands to compile and make an executable file. Firstly both the main code and the code given in functions directory should be stored locally in the same directory. Now run the following commands one at a time:

nasm -f elf64 filename.asm -o filename.o
ld filename.o -o filename
./filename

Here change filename.asm and filename.o to the corresponnding file name which you want to execute.

1. .data

   All the pre defined values ,like strings, are stored with a label so that this perticular value or string can be called at any part of the code.Also to call these strings the proper length is required which can also be written here

   syntax:

   section .data:
      label1 size "your string here",  any operator like '\n' or '\t'
      label2 equ $- label1 
   

2. .bss

   All the variables of any datatype that you want to use in the code is assigned here with a fixed storage space.

   syntax:

   section .bss
       label resb value
   

3. .text

   The place where all the instructions are written or the heart of our assembly code.

To write inctructions in assembly you should be knowing some basic commands and syscall values for the registers.

Registers are used to store data in any of the low level language like assembly language. They can store both vales and the address where thee value is actually stored i.e. they act as variables and pointers at the same time. They can be of different size according to the values stored in it.There are different types of registers

1. General puspose registers

   These registers are used as variables inside the code to move around values and strings.

2. Special purppose registers

   These registers,apart from storing values, are used foe certain specific functions. For example rax register has certain values for each type of kernal syscall such as to read a value or write in the terminal etc.

3. Flag registers

   These are 1 bit registers which are used to store either true or false (1 or 0) according to the instructions like cmp etc.

• Add more info about x86-64 assembly language
• Different syscall values for the registers