linux-kernel - [RFC PATCH v2 02/10] powerpc/32: Add EXCEPTION_PROLOG_0 in head

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Message-Id: <b665e61982f5b1963751c4d9d44288a5201e433b.1567245404.git.christophe.leroy@c-s.fr>
Date:   Sat, 31 Aug 2019 10:18:26 +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>, npiggin@...il.com,
        dja@...ens.net
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v2 02/10] powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h

This patch creates a macro for the very first part of
exception prolog, this will help when implementing
CONFIG_VMAP_STACK

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/head_32.S  | 4 +---
 arch/powerpc/kernel/head_32.h  | 9 ++++++---
 arch/powerpc/kernel/head_8xx.S | 9 ++-------
 3 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 9e6f01abb31e..53a9dab024c7 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -264,9 +264,7 @@ __secondary_hold_acknowledge:
  */
 	. = 0x200
 	DO_KVM  0x200
-	mtspr	SPRN_SPRG_SCRATCH0,r10
-	mtspr	SPRN_SPRG_SCRATCH1,r11
-	mfcr	r10
+	EXCEPTION_PROLOG_0
 #ifdef CONFIG_PPC_CHRP
 	mfspr	r11, SPRN_SPRG_THREAD
 	lwz	r11, RTAS_SP(r11)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index b2ca8c9ffd8b..8e345f8d4b0e 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -10,13 +10,16 @@
  * We assume sprg3 has the physical address of the current
  * task's thread_struct.
  */
-
 .macro EXCEPTION_PROLOG
+	EXCEPTION_PROLOG_0
+	EXCEPTION_PROLOG_1
+	EXCEPTION_PROLOG_2
+.endm
+
+.macro EXCEPTION_PROLOG_0
 	mtspr	SPRN_SPRG_SCRATCH0,r10
 	mtspr	SPRN_SPRG_SCRATCH1,r11
 	mfcr	r10
-	EXCEPTION_PROLOG_1
-	EXCEPTION_PROLOG_2
 .endm
 
 .macro EXCEPTION_PROLOG_1
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 5ab9178c2347..16d68c8575ca 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -493,10 +493,7 @@ InstructionTLBError:
  */
 	. = 0x1400
 DataTLBError:
-	mtspr	SPRN_SPRG_SCRATCH0, r10
-	mtspr	SPRN_SPRG_SCRATCH1, r11
-	mfcr	r10
-
+	EXCEPTION_PROLOG_0
 	mfspr	r11, SPRN_DAR
 	cmpwi	cr0, r11, RPN_PATTERN
 	beq-	FixupDAR	/* must be a buggy dcbX, icbi insn. */
@@ -529,9 +526,7 @@ DARFixed:/* Return from dcbx instruction bug workaround */
  */
 	. = 0x1c00
 DataBreakpoint:
-	mtspr	SPRN_SPRG_SCRATCH0, r10
-	mtspr	SPRN_SPRG_SCRATCH1, r11
-	mfcr	r10
+	EXCEPTION_PROLOG_0
 	mfspr	r11, SPRN_SRR0
 	cmplwi	cr0, r11, (.Ldtlbie - PAGE_OFFSET)@l
 	cmplwi	cr7, r11, (.Litlbie - PAGE_OFFSET)@l
-- 
2.13.3