# \[PATCH 37/63\] powerpc: Fix offset of FPRs in VSX registers in little endian builds

- From: Anton Blanchard \<hidden\>
- Date: 2013-08-06 16:01:54 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2013/08/9475638
- Thread: https://ratatoskr.run/linuxppc-dev/2013/08/9475601/t.md

```text
The FPRs overlap the high doublewords of the first 32 VSX registers.
Fix TS_FPROFFSET and TS_VSRLOWOFFSET so we access the correct fields
in little endian mode.

If VSX is disabled the FPRs are only one doubleword in length so
TS_FPROFFSET needs adjusting in little endian.

Signed-off-by: Anton Blanchard <redacted>
---
 arch/powerpc/include/asm/processor.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 47a35b0..d705431 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -14,8 +14,18 @@
 
 #ifdef CONFIG_VSX
 #define TS_FPRWIDTH 2
+
+#ifdef __BIG_ENDIAN__
+#define TS_FPROFFSET 0
+#define TS_VSRLOWOFFSET 1
+#else
+#define TS_FPROFFSET 1
+#define TS_VSRLOWOFFSET 0
+#endif
+
 #else
 #define TS_FPRWIDTH 1
+#define TS_FPROFFSET 0
 #endif
 
 #ifdef CONFIG_PPC64
@@ -142,8 +152,6 @@ typedef struct {
 	unsigned long seg;
 } mm_segment_t;
 
-#define TS_FPROFFSET 0
-#define TS_VSRLOWOFFSET 1
 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
 #define TS_TRANS_FPR(i) transact_fpr[i][TS_FPROFFSET]
 
-- 
1.8.1.2
```