osx-x64-getinput.asm

global start

section .data
  prompt db "Enter Something... "
  
section .bss
  buffer: resw 4
  outstring: resw 4
  
section .text

start:

  mov rax, 0x2000004  ; sys write
  mov rdi, 1          ; stdout
  mov rsi, prompt     ; address of prompt
  mov rdx, 32
  syscall
  
  mov rax, 0x2000003  ; sys read
  mov rdi, 0          ; stdin
  mov rsi, buffer     
  mov rdx, 32
  syscall
  
  mov rax, 0x200004
  mov rdi, 1
  mov rsi, buffer
  mov rdx, 32
  syscall
  
  mov rax, 0x200001 ;sys exit
  mov rdi, 0        ; clean exit
  syscall