[PATCH] ppc32: refactor FPU exception handling

Moved common FPU exception handling code out of head.S so it can be used by
several of the sub-architectures that might of a full PowerPC FPU.

Also, uses new CONFIG_PPC_FPU define to fix alignment exception handling
for floating point load/store instructions to only occur if we have a
hardware FPU.

Signed-off-by: Jason McMullan <jason.mcmullan@timesys.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/ppc/kernel/head_booke.h b/arch/ppc/kernel/head_booke.h
index 884dac916bce..f213d12eec08 100644
--- a/arch/ppc/kernel/head_booke.h
+++ b/arch/ppc/kernel/head_booke.h
@@ -337,4 +337,11 @@ label:
         addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
         EXC_XFER_LITE(0x0900, timer_interrupt)
 
+#define FP_UNAVAILABLE_EXCEPTION                                              \
+        START_EXCEPTION(FloatingPointUnavailable)                             \
+        NORMAL_EXCEPTION_PROLOG;                                              \
+        bne     load_up_fpu;            /* if from user, just load it up */   \
+        addi    r3,r1,STACK_FRAME_OVERHEAD;                                   \
+        EXC_XFER_EE_LITE(0x800, KernelFP)
+
 #endif /* __HEAD_BOOKE_H__ */