*** entry.S     2015-02-23 11:55:49.209507374 +0000
--- entry.S.new 2015-02-23 11:55:42.525460005 +0000
***************
*** 348,355 ****
   * The LP register should point to the location where the called function
   * should return.  [note that MAKE_SYS_CALL uses label 1] */
        /* See if the system call number is valid */
        addi    r11, r12, -__NR_syscalls;
!       bgei    r11,5f;
        /* Figure out which function to use for this system call.  */
        /* Note Microblaze barrel shift is optional, so don't rely on it */
        add     r12, r12, r12;                  /* convert num -> ptr */
--- 348,356 ----
   * The LP register should point to the location where the called function
   * should return.  [note that MAKE_SYS_CALL uses label 1] */
        /* See if the system call number is valid */
+       blti    r12, 5f;
        addi    r11, r12, -__NR_syscalls;
!       bgei    r11, 5f;
        /* Figure out which function to use for this system call.  */
        /* Note Microblaze barrel shift is optional, so don't rely on it */
        add     r12, r12, r12;                  /* convert num -> ptr */
***************
*** 375,381 ****
  
        /* The syscall number is invalid, return an error.  */
  5:
!       rtsd    r15, 8;         /* looks like a normal subroutine return */
        addi    r3, r0, -ENOSYS;
  
  /* Entry point used to return from a syscall/trap */
--- 376,382 ----
  
        /* The syscall number is invalid, return an error.  */
  5:
!       brad ret_from_trap;      /* Go to cleanup routine */
        addi    r3, r0, -ENOSYS;
  
  /* Entry point used to return from a syscall/trap */