helloworld.s

.global _main
.align 2

.data
msg: .ascii "Hello, World!\n"  ; non-null terminated 'string'
len = . - msg                  ; Calculate string length (14 bytes)

.text
_main:
  mov x0, #1                 ; File descriptor 1 = stdout
  adrp x1, msg@PAGE          ; Load page address of msg
  add x1, x1, msg@PAGEOFF    ; Add page offset
  mov x2, #len               ; x2 = length (14)
  mov x16, #4                ; System call: write
  svc #0x80                  ; Ask kernel to print

  mov x0, #0                 ; Return code 0 = success
  mov x16, #1                ; System call: exit
  svc #0x80                  ; Goodbye!