public static Address sysShmat(int shmid, Address addr, int flags) { return null;
public static Address sysShmat(int shmid, Address addr, int flags) { return VM_SysCallMagic.sysShmat(VM_BootRecord.the_boot_record.sysShmatIP, shmid, addr, flags);
  public static Address sysShmat(int shmid, Address addr, int flags) {     return null;   }