powerpc/power8: Update denormalization handler

POWER8 can take a denormalisation exception on any VSX registers.

This does the extra 32 VSX registers we don't currently handle.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 3c9296bcf960..e783453f910d 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -480,6 +480,16 @@ FTR_SECTION_ELSE
         XVCPSGNDP32(0)
 
 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
+
+BEGIN_FTR_SECTION
+        b       denorm_done
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
+/*
+ * To denormalise we need to move a copy of the register to itself.
+ * For POWER8 we need to do that for all 64 VSX registers
+ */
+        XVCPSGNDP32(32)
+denorm_done:
         mtspr   SPRN_HSRR0,r11
         mtcrf   0x80,r9
         ld      r9,PACA_EXGEN+EX_R9(r13)