test.asm

; Assembly hello world for OSX
; So I can remember how to do basic shit in OSX
;
; $ nasm -g -f macho -o test.o test.asm
; $ ld -o a.out -e _main test.o -lSystem
bits 32

section .data
    message db "Hello, world!", 10, 0

section .text
global _main
extern _printf
extern _exit

_main:
  ; Store argc and argv
  pop eax
  pop ebx

  ; 16-bit stack alignment
  mov ebp, esp
  and esp, 0xFFFFFFF0
  sub esp, 16

  ;push message
  mov dword[esp], message
  call _printf

  mov dword[esp], 0
  call _exit
  ret