Blackfin arch: Add basic irq stack checking for Blackfin

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/processor.h b/arch/blackfin/include/asm/processor.h
index 2cb0b8711fa..83d57a85b14 100644
--- a/arch/blackfin/include/asm/processor.h
+++ b/arch/blackfin/include/asm/processor.h
@@ -24,6 +24,14 @@ static inline void wrusp(unsigned long usp)
         __asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
 }
 
+static inline unsigned long __get_SP(void)
+{
+        unsigned long sp;
+
+        __asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
+        return sp;
+}
+
 /*
  * User space process size: 1st byte beyond user address space.
  * Fairly meaningless on nommu.  Parts of user programs can be scattered