1. 根目录:
2. arch
3. score
4. include
5. uapi
6. asm
7. unistd.h

#define __ARCH_HAVE_MMU

#define __ARCH_WANT_SYSCALL_NO_AT
#define __ARCH_WANT_SYSCALL_NO_FLAGS
#define __ARCH_WANT_SYSCALL_OFF_T
#define __ARCH_WANT_SYSCALL_DEPRECATED
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK

#include <asm-generic/unistd.h>