--- [2] Hello World In Assembly --------------------------------------------//--

[ CODE - bigsmile.asm ]

SECTION .DATA
  msg:     db "[^0^] u!!",10
  msgLen:  equ $-msg

SECTION .TEXT
GLOBAL _start

_start:
; Print ----------------------------------------------------------------
  mov rax, 1      ; Syscall 1
  mov rdi, 1      ; The File Descriptor - STDOUT
  mov rsi, msg    ; Pointer to the message
  mov rdx, msgLen ; Length of the Message
  syscall

; Exit -----------------------------------------------------------------
  mov rax, 60     ; Syscall 60
  mov rdi, 0      ; Error code - eg return 0;
  syscall

[ Build and Execute ]

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

[ Read attributes about the elf binary ]

 readelf -a bigsmile

[ Disassembly ]

 r2 bigsmile

[0x00400082]> pd
  ;-- entry0:
  ;-- section..TEXT:
  ;-- rip:
  0x00400082 b801000000     mov eax, 1
  0x00400087 bf01000000     mov edi, 1
  0x0040008c 48be78004000.  movabs rsi, 0x400078 ; section..DATA ;"[^0^] u!!\n"
  0x00400096 ba0a000000     mov edx, 0xa
  0x0040009b 0f05           syscall
  0x0040009d b83c000000     mov eax, 0x3c
  0x004000a2 bf00000000     mov edi, 0
  0x004000a7 0f05           syscall

[ Changes Made ]

 - Using syscalls directly
 - Using nasm to compile and ld to link

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