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authorJesper Nilsson <jesper.nilsson@axis.com>2010-08-02 18:13:45 +0200
committerJesper Nilsson <jesper.nilsson@axis.com>2010-08-04 13:00:09 +0200
commitcd4f20110cf46ab7ca35ea32d601576b31abd9bb (patch)
tree31cd14ab3ab1a4a1b2dedeaf8aba5f59d257d0f3 /arch/cris/arch-v32/kernel/entry.S
parent43f6cdd7693ddddb4db17a1ab591d506cb1fc110 (diff)
CRIS: Faster syscall entry for CRISv32.
Signed-off-by: Edgar Iglesias <Edgar.Iglesias@axis.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Diffstat (limited to 'arch/cris/arch-v32/kernel/entry.S')
-rw-r--r--arch/cris/arch-v32/kernel/entry.S37
1 files changed, 17 insertions, 20 deletions
diff --git a/arch/cris/arch-v32/kernel/entry.S b/arch/cris/arch-v32/kernel/entry.S
index ce121df3aae..0ecb50b8f0d 100644
--- 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