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[8/9] powerpc/64s: paca EX_R3 can be merged with EX_DAR

Message ID 20170521131550.25813-9-npiggin@gmail.com (mailing list archive)
State Accepted
Commit 635942ae53cc5d4049c2c4a5bd2ad819e3a47ee5
Headers show

Commit Message

Nicholas Piggin May 21, 2017, 1:15 p.m. UTC 
EX_R3 is used only for a small section of the bad stack handler.
Merge it with EX_DAR.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/include/asm/exception-64s.h | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
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Patch

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index ba03db14e1e8..aaee57f0e5ad 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -34,12 +34,11 @@ 
 #define EX_DAR		40
 #define EX_DSISR	48
 #define EX_CCR		52
-#define EX_R3		56
-#define EX_CFAR		64
-#define EX_PPR		72
-#define EX_CTR		80
+#define EX_CFAR		56
+#define EX_PPR		64
+#define EX_CTR		72
 
-#define EX_SIZE		11	/* size in u64 units */
+#define EX_SIZE		10	/* size in u64 units */
 
 /*
  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
@@ -49,6 +48,13 @@ 
  */
 #define EX_LR		EX_DAR
 
+/*
+ * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
+ * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
+ * with EX_DAR.
+ */
+#define EX_R3		EX_DAR
+
 #ifdef __ASSEMBLY__
 
 /*