Mac under compilation Hello World

From: http://snipplr.com/view/29150

; Hello World on Assembly for Mac; Nasm-f Macho hello.asm; Ld-e _start-o Hello hello.o;section. Text global _start; must be declared for Linker (LD) _SYSC     All:int 0x80; system call Ret_start:; Tell linker entry point  push DWORD Len; message length push DWORD msg; message to write push DWORD 1; file                             Descriptor (STDOUT) MOV eax,0x4; system call number (Sys_write), call _syscall;                             ; The alternate-to-call kernel:;p ush eax     Call 7:0 add esp,12, clean stack (3 arguments * 4) push DWORD 0; Exit code                             MOV eax,0x1; system call NUMBER (Sys_exit) call _syscall; call kernel ; We do not return from sys_exit,; there ' s no need to CLEAN stacksection. Datamsg db "Hello, world!", 0xa; our dear Stringlen equ $-msg; len Gth of our dear string

　　

Mac under compilation Hello World