linux-kernel - [PATCH v4 05/16] powerpc/32: add a macro to get and/or save DAR and DSISR on stack.

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Message-Id: <0e55a18fe9a82e6ee57b642f8bd8f0b8c6c81de6.1574771540.git.christophe.leroy@c-s.fr>
Date:   Tue, 26 Nov 2019 12:36:08 +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,
        linux-mm@...ck.org
Subject: [PATCH v4 05/16] powerpc/32: add a macro to get and/or save DAR and
 DSISR on stack.

Refactor reading and saving of DAR and DSISR in exception vectors.

This will ease the implementation of VMAP stack.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/head_32.S  |  5 +----
 arch/powerpc/kernel/head_32.h  | 11 +++++++++++
 arch/powerpc/kernel/head_8xx.S | 23 +++++++----------------
 3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index bebb49d877f2..449625b4ff03 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -339,10 +339,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
 	DO_KVM  0x600
 Alignment:
 	EXCEPTION_PROLOG
-	mfspr	r4,SPRN_DAR
-	stw	r4,_DAR(r11)
-	mfspr	r5,SPRN_DSISR
-	stw	r5,_DSISR(r11)
+	save_dar_dsisr_on_stack r4, r5, r11
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 	EXC_XFER_STD(0x600, alignment_exception)
 
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 436ffd862d2a..f19a1ab91fb5 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -144,6 +144,17 @@
 	RFI				/* jump to handler, enable MMU */
 .endm
 
+.macro save_dar_dsisr_on_stack reg1, reg2, sp
+	mfspr	\reg1, SPRN_DAR
+	mfspr	\reg2, SPRN_DSISR
+	stw	\reg1, _DAR(\sp)
+	stw	\reg2, _DSISR(\sp)
+.endm
+
+.macro get_and_save_dar_dsisr_on_stack reg1, reg2, sp
+	save_dar_dsisr_on_stack \reg1, \reg2, \sp
+.endm
+
 /*
  * Note: code which follows this uses cr0.eq (set if from kernel),
  * r11, r12 (SRR0), and r9 (SRR1).
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 175c3cfc8014..25e19af49705 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -128,12 +128,9 @@ instruction_counter:
 	. = 0x200
 MachineCheck:
 	EXCEPTION_PROLOG
-	mfspr r4,SPRN_DAR
-	stw r4,_DAR(r11)
-	li r5,RPN_PATTERN
-	mtspr SPRN_DAR,r5	/* Tag DAR, to be used in DTLB Error */
-	mfspr r5,SPRN_DSISR
-	stw r5,_DSISR(r11)
+	save_dar_dsisr_on_stack r4, r5, r11
+	li	r6, RPN_PATTERN
+	mtspr	SPRN_DAR, r6	/* Tag DAR, to be used in DTLB Error */
 	addi r3,r1,STACK_FRAME_OVERHEAD
 	EXC_XFER_STD(0x200, machine_check_exception)
 
@@ -156,12 +153,9 @@ InstructionAccess:
 	. = 0x600
 Alignment:
 	EXCEPTION_PROLOG
-	mfspr	r4,SPRN_DAR
-	stw	r4,_DAR(r11)
-	li	r5,RPN_PATTERN
-	mtspr	SPRN_DAR,r5	/* Tag DAR, to be used in DTLB Error */
-	mfspr	r5,SPRN_DSISR
-	stw	r5,_DSISR(r11)
+	save_dar_dsisr_on_stack r4, r5, r11
+	li	r6, RPN_PATTERN
+	mtspr	SPRN_DAR, r6	/* Tag DAR, to be used in DTLB Error */
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 	EXC_XFER_STD(0x600, alignment_exception)
 
@@ -502,10 +496,7 @@ DataTLBError:
 DARFixed:/* Return from dcbx instruction bug workaround */
 	EXCEPTION_PROLOG_1
 	EXCEPTION_PROLOG_2
-	mfspr	r5,SPRN_DSISR
-	stw	r5,_DSISR(r11)
-	mfspr	r4,SPRN_DAR
-	stw	r4, _DAR(r11)
+	get_and_save_dar_dsisr_on_stack r4, r5, r11
 	andis.	r10,r5,DSISR_NOHPTE@h
 	beq+	.Ldtlbie
 	tlbie	r4
-- 
2.13.3