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| author | Vineet Gupta | 2015-03-13 07:20:23 +0100 |
|---|---|---|
| committer | Vineet Gupta | 2015-06-19 14:39:39 +0200 |
| commit | 62fb64034d30293448de10a48c7ee47ee978e338 (patch) | |
| tree | 29cad87e376821c563b2d93e7e8fb634f41af705 /arch/arc/kernel/entry.S | |
| parent | ARC: entry.S: move some code around for cache locality in return path (diff) | |
| download | kernel-qcow2-linux-62fb64034d30293448de10a48c7ee47ee978e338.tar.gz kernel-qcow2-linux-62fb64034d30293448de10a48c7ee47ee978e338.tar.xz kernel-qcow2-linux-62fb64034d30293448de10a48c7ee47ee978e338.zip | |
ARC: entry.S: micro-optimize Trap handler
Elide the need to re-read ECR in Trap handler by ensuring that
EXCEPTION_PROLOGUE does that at the very end just before returning
to Trap handler
ARCv2 EXCEPTION_PROLOGUE already did that, so same for ARcompact and the
common trap handler adjusted to use cached ECR
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel/entry.S')
| -rw-r--r-- | arch/arc/kernel/entry.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index 603266eb75e1..f7a82fd4d601 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -258,8 +258,8 @@ ENTRY(EV_Trap) EXCEPTION_PROLOGUE ;============ TRAP 1 :breakpoints - lr r10, [ecr] - bmsk.f 0, r10, 7 + ; Check ECR for trap with arg (PROLOGUE ensures r9 has ECR) + bmsk.f 0, r9, 7 bnz trap_with_param ;============ TRAP (no param): syscall top level |