Re: [RFC PATCH 10/17] PowerPC: booke64: Refactor exception prolog for save/restore regs

Refactor exception prolog to allow save/restore register parameters. Add
addition none definition for exception prolog usage.
This is needed for exceptions like Guest Doorbell that use GSRRx regsiters
which do not map on exception type.

Signed-off-by: Mihai Caraman <redacted>
---
 arch/powerpc/kernel/exceptions-64e.S |   23 ++++++++---------------
 1 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index 7215cc2..52aa96b 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S

@@ -35,7 +35,7 @@
 #define	SPECIAL_EXC_FRAME_SIZE	INT_FRAME_SIZE
 
 /* Exception prolog code for all exceptions */
-#define EXCEPTION_PROLOG(n, type, addition)				    \
+#define EXCEPTION_PROLOG(n, type, srr0, srr1, addition)		     	    \
 	mtspr	SPRN_SPRG_##type##_SCRATCH,r13;	/* get spare registers */   \
 	mfspr	r13,SPRN_SPRG_PACA;	/* get PACA */			    \
 	std	r10,PACA_EX##type+EX_R10(r13);				    \

@@ -44,54 +44,47 @@
 	addition;			/* additional code for that exc. */ \
 	std	r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */  \
 	stw	r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
-	mfspr	r11,SPRN_##type##_SRR1;/* what are we coming from */	    \
+	mfspr	r11,srr1;/* what are we coming from */	    		    \
 	type##_SET_KSTACK;		/* get special stack if necessary */\
 	andi.	r10,r11,MSR_PR;		/* save stack pointer */	    \
 	beq	1f;			/* branch around if supervisor */   \
 	ld	r1,PACAKSAVE(r13);	/* get kernel stack coming from usr */\
 1:	cmpdi	cr1,r1,0;		/* check if SP makes sense */	    \
 	bge-	cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
-	mfspr	r10,SPRN_##type##_SRR0;	/* read SRR0 before touching stack */
+	mfspr	r10,srr0;		/* read SRR0 before touching stack */