; syscall number: rax
; args: rdi, rsi, rdx, r10
; syscall
; return value: rax

global _start

section .data
str: db '30', 0xA

section .bss

section .text
_start:
  mov rsi, str
  mov rdx, 3
  call write_stdout
  call exit

; rsi: buf, rdx: count
write_stdout:
  mov rdi, 1
  mov rax, 1
  syscall
  ret

exit:
  xor rdi, rdi
  mov rax, 60
  syscall