CRIS: Faster syscall entry for CRISv32.

Signed-off-by: Edgar Iglesias <Edgar.Iglesias@axis.com>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>

diff --git a/arch/cris/arch-v32/kernel/entry.S b/arch/cris/arch-v32/kernel/entry.S
index ce121df..0ecb50b 100644 (file)
--- a/arch/cris/arch-v32/kernel/entry.S
+++ b/arch/cris/arch-v32/kernel/entry.S
@@ -131,27 +131,24 @@ _resume_userspace:
 system_call:
        ;; Stack-frame similar to the irq heads, which is reversed in
        ;; ret_from_sys_call.
-       subq    12, $sp         ; Skip EXS, EDA.
-       move    $erp, [$sp]
-       subq    4, $sp
-       move    $srp, [$sp]
-       subq    4, $sp
-       move    $ccs, [$sp]
-       subq    4, $sp
-       ei                      ; Allow IRQs while handling system call
-       move    $spc, [$sp]
-       subq    4, $sp
-       move    $mof, [$sp]
-       subq    4, $sp
-       move    $srs, [$sp]
-       subq    4, $sp
-       move.d  $acr, [$sp]
-       subq    14*4, $sp       ; Make room for R0-R13.
-       movem   $r13, [$sp]     ; Push R0-R13
-       subq    4, $sp
-       move.d  $r10, [$sp]     ; Push orig_r10.
 
-; Set S-bit when kernel debugging to keep hardware breakpoints active.
+       sub.d   92, $sp         ; Skip EXS and EDA.
+       movem   $r13, [$sp]
+       move.d  $sp, $r8
+       addq    14*4, $r8
+       move.d  $acr, $r0
+       move    $srs, $r1
+       move    $mof, $r2
+       move    $spc, $r3
+       move    $ccs, $r4
+       move    $srp, $r5
+       move    $erp, $r6
+       subq    4, $sp
+       movem   $r6, [$r8]
+       ei                      ; Enable interrupts while processing syscalls.
+       move.d  $r10, [$sp]
+
+       ; Set S-bit when kernel debugging to keep hardware breakpoints active.
 #ifdef CONFIG_ETRAX_KGDB
        move $ccs, $r0
        or.d (1<<9), $r0