Blackfin arch: Add Workaround for ANOMALY 05000257

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 8eb0a9023482..e463733f5c77 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -181,6 +181,12 @@ ENTRY(_ex_single_step)
 
 _return_from_exception:
         DEBUG_START_HWTRACE
+#ifdef ANOMALY_05000257
+        R7=LC0;
+        LC0=R7;
+        R7=LC1;
+        LC1=R7;
+#endif
         (R7:6,P5:4) = [sp++];
         ASTAT = [sp++];
         sp = retn;