From fc4e188789b01dc9f18c80869c43fdd7d1a51378 Mon Sep 17 00:00:00 2001
From: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Date: Tue, 19 Jan 2010 14:41:55 +0100
Subject: ppc: Loose GOT access in IRQ

Using the GOT in IRQ handlers requires r14 to be -ffixed-r14.
Avoid this by relocatate transfer_to_handler too.
This will allow to free up r14 later on.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
---
 include/ppc_asm.tmpl | 47 ++++++++++++++++++++++-------------------------
 1 file changed, 22 insertions(+), 25 deletions(-)

(limited to 'include/ppc_asm.tmpl')

diff --git a/include/ppc_asm.tmpl b/include/ppc_asm.tmpl
index 0019d46..fa5c5f6 100644
--- a/include/ppc_asm.tmpl
+++ b/include/ppc_asm.tmpl
@@ -257,46 +257,43 @@
  * OFFSET values only; they must be relocated first before they can
  * be used!
  */
-#define STD_EXCEPTION(n, label, hdlr)			\
-	. = n;						\
-label:							\
-	EXCEPTION_PROLOG(SRR0, SRR1);			\
-	lwz	r3,GOT(transfer_to_handler);		\
-	mtlr	r3;					\
-	addi	r3,r1,STACK_FRAME_OVERHEAD;		\
-	li	r20,MSR_KERNEL;				\
+#define COPY_EE(d, s)		rlwimi d,s,0,16,16
+#define NOCOPY(d, s)
+#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee)	\
+	bl	1f;					\
+1:	mflr    r20;					\
+	lwz	r20,(.L_ ## label)-1b+8(r20);		\
+	mtlr	r20;					\
+	li	r20,msr;				\
+	copyee(r20,r23);				\
 	rlwimi	r20,r23,0,25,25;			\
 	blrl;						\
 .L_ ## label :						\
 	.long	hdlr - _start + _START_OFFSET;		\
-	.long	int_return - _start + _START_OFFSET
+	.long	int_return - _start + _START_OFFSET;	\
+	.long	transfer_to_handler - _start + _START_OFFSET
+
+#define STD_EXCEPTION(n, label, hdlr)				\
+	. = n;							\
+label:								\
+	EXCEPTION_PROLOG(SRR0, SRR1);				\
+	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
+	EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY)	\
 
 #define CRIT_EXCEPTION(n, label, hdlr)				\
 	. = n;							\
 label:								\
 	EXCEPTION_PROLOG(CSRR0, CSRR1);				\
-	lwz	r3,GOT(transfer_to_handler);			\
-	mtlr	r3;						\
 	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
-	li	r20,(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE));	\
-	rlwimi	r20,r23,0,25,25;				\
-	blrl;							\
-.L_ ## label :							\
-	.long	hdlr - _start + _START_OFFSET;			\
-	.long	crit_return - _start + _START_OFFSET
+	EXC_XFER_TEMPLATE(label, hdlr,				\
+	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\
 
 #define MCK_EXCEPTION(n, label, hdlr)				\
 	. = n;							\
 label:								\
 	EXCEPTION_PROLOG(MCSRR0, MCSRR1);			\
-	lwz	r3,GOT(transfer_to_handler);			\
-	mtlr	r3;						\
 	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
-	li	r20,(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE));	\
-	rlwimi	r20,r23,0,25,25;				\
-	blrl;							\
-.L_ ## label :							\
-	.long	hdlr - _start + _START_OFFSET;			\
-	.long	mck_return - _start + _START_OFFSET
+	EXC_XFER_TEMPLATE(label, hdlr,				\
+	MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)		\
 
 #endif	/* __PPC_ASM_TMPL__ */
-- 
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