linux-kernel - [PATCH 10/11] powerpc/40x: Add EXC_XFER_TEMPLATE

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Message-Id: <1b0d65d644079e205901f198bfa9ac0fdbafb05b.1548673552.git.christophe.leroy@c-s.fr>
Date:   Mon, 28 Jan 2019 11:11:31 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 10/11] powerpc/40x: Add EXC_XFER_TEMPLATE_CRITICAL()

This patch adds EXC_XFER_TEMPLATE_CRITICAL() for handling
transfer to critical exception handler. This will allow
to move the normal exception to using the standard
EXC_XFER_TEMPLATE() defined in head_32.h

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/head_40x.S | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 1203075c0c1a..d52e460ea85e 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -219,9 +219,7 @@ label:
 	START_EXCEPTION(n, label);				\
 	CRITICAL_EXCEPTION_PROLOG;				\
 	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
-	EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
-			  NOCOPY, crit_transfer_to_handler,	\
-			  ret_from_crit_exc)
+	EXC_XFER_TEMPLATE_CRITICAL(hdlr, n+2)
 
 #define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret)	\
 	li	r10,trap;					\
@@ -233,6 +231,14 @@ label:
 	.long	hdlr;						\
 	.long	ret
 
+#define EXC_XFER_TEMPLATE_CRITICAL(hdlr, trap)			\
+	li	r10,trap;					\
+	stw	r10,_TRAP(r11);					\
+	li	r10, MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE);	\
+	bl	crit_transfer_to_handler;		 	\
+	.long	hdlr;						\
+	.long	ret_from_crit_exc
+
 #define COPY_EE(d, s)		rlwimi d,s,0,16,16
 #define NOCOPY(d, s)
 
@@ -733,9 +739,7 @@ label:
 	/* continue normal handling for a critical exception... */
 2:	mfspr	r4,SPRN_DBSR
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	EXC_XFER_TEMPLATE(DebugException, 0x2002, \
-		(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
-		NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
+	EXC_XFER_TEMPLATE_CRITICAL(DebugException, 0x2002)
 
 	/* Programmable Interval Timer (PIT) Exception. (from 0x1000) */
 Decrementer:
@@ -755,10 +759,7 @@ FITException:
 WDTException:
 	CRITICAL_EXCEPTION_PROLOG;
 	addi	r3,r1,STACK_FRAME_OVERHEAD;
-	EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
-	                  (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
-			  NOCOPY, crit_transfer_to_handler,
-			  ret_from_crit_exc)
+	EXC_XFER_TEMPLATE_CRITICAL(WatchdogException, 0x1020+2)
 
 /*
  * The other Data TLB exceptions bail out to this point
-- 
2.13.3