microblaze: Fix _user_exception function

Saving some instructions. Clear VMS bit if kernel comes
from kernel space.

Signed-off-by: Michal Simek <monstr@monstr.eu>

diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index e7abf7426c8cbe122e497db9e78b11468cb089b8..4c06e1a46a25f814cda68124f9c4b3ff53151b85 100644 (file)
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -352,6 +352,7 @@ C_ENTRY(_user_exception):
        swi     r0, r1, PTO + PT_MODE;                  /* Was in user-mode. */
        lwi     r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
        swi     r11, r1, PTO+PT_R1;             /* Store user SP.  */
+       clear_ums;
 2:     lwi     CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
        /* Save away the syscall number.  */
        swi     r12, r1, PTO+PT_R0;
@@ -363,10 +364,8 @@ C_ENTRY(_user_exception):
  * register should point to the location where
  * the called function should return.  [note that MAKE_SYS_CALL uses label 1] */
 
-       # Step into virtual mode.
-       set_vms;
-       addik   r11, r0, 3f
-       rtid    r11, 0
+       /* Step into virtual mode */
+       rtbd    r0, 3f
        nop
 3:
        lwi     r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */