linux-kernel - [RFC PATCH 4/4] powerpc/64e: Get dear offset with

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Message-Id: <20210726143053.532839-4-sxwjean@me.com>
Date:   Mon, 26 Jul 2021 22:30:53 +0800
From:   sxwjean@...com
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     oleg@...hat.com, mpe@...erman.id.au, benh@...nel.crashing.org,
        paulus@...ba.org, ravi.bangoria@...ux.ibm.com,
        christophe.leroy@...roup.eu, npiggin@...il.com,
        aneesh.kumar@...ux.ibm.com, sandipan@...ux.ibm.com,
        efremov@...ux.com, peterx@...hat.com, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, Xiongwei Song <sxwjean@...il.com>
Subject: [RFC PATCH 4/4] powerpc/64e: Get dear offset with _DEAR macro

From: Xiongwei Song <sxwjean@...il.com>

Use _DEAR to get the offset of dear register in pr_regs for 64e cpus.

Signed-off-by: Xiongwei Song <sxwjean@...il.com>
---
 arch/powerpc/kernel/asm-offsets.c    | 13 +++----------
 arch/powerpc/kernel/exceptions-64e.S |  8 ++++----
 2 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index f4ebc435fd78..8357d5fcd09e 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -286,23 +286,16 @@ int main(void)
 	STACK_PT_REGS_OFFSET(_CCR, ccr);
 	STACK_PT_REGS_OFFSET(_XER, xer);
 	STACK_PT_REGS_OFFSET(_DAR, dar);
+	STACK_PT_REGS_OFFSET(_DEAR, dear);
 	STACK_PT_REGS_OFFSET(_DSISR, dsisr);
 	STACK_PT_REGS_OFFSET(_ESR, esr);
 	STACK_PT_REGS_OFFSET(ORIG_GPR3, orig_gpr3);
 	STACK_PT_REGS_OFFSET(RESULT, result);
 	STACK_PT_REGS_OFFSET(_TRAP, trap);
-#ifndef CONFIG_PPC64
-	/*
-	 * The PowerPC 400-class & Book-E processors have neither the DAR
-	 * nor the DSISR SPRs. Hence, we overload them to hold the similar
-	 * DEAR and ESR SPRs for such processors.  For critical interrupts
-	 * we use them to hold SRR0 and SRR1.
-	 */
-	STACK_PT_REGS_OFFSET(_DEAR, dar);
-#else /* CONFIG_PPC64 */
+#ifdef CONFIG_PPC64
 	STACK_PT_REGS_OFFSET(SOFTE, softe);
 	STACK_PT_REGS_OFFSET(_PPR, ppr);
-#endif /* CONFIG_PPC64 */
+#endif
 
 #ifdef CONFIG_PPC_PKEY
 	STACK_PT_REGS_OFFSET(STACK_REGS_AMR, amr);
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index bf8c4c2f98ea..221e085e8c8c 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -545,7 +545,7 @@ __end_interrupts:
 				PROLOG_ADDITION_2REGS)
 	mfspr	r14,SPRN_DEAR
 	mfspr	r15,SPRN_ESR
-	std	r14,_DAR(r1)
+	std	r14,_DEAR(r1)
 	std	r15,_ESR(r1)
 	ld	r14,PACA_EXGEN+EX_R14(r13)
 	ld	r15,PACA_EXGEN+EX_R15(r13)
@@ -558,7 +558,7 @@ __end_interrupts:
 				PROLOG_ADDITION_2REGS)
 	li	r15,0
 	mr	r14,r10
-	std	r14,_DAR(r1)
+	std	r14,_DEAR(r1)
 	std	r15,_ESR(r1)
 	ld	r14,PACA_EXGEN+EX_R14(r13)
 	ld	r15,PACA_EXGEN+EX_R15(r13)
@@ -575,7 +575,7 @@ __end_interrupts:
 				PROLOG_ADDITION_2REGS)
 	mfspr	r14,SPRN_DEAR
 	mfspr	r15,SPRN_ESR
-	std	r14,_DAR(r1)
+	std	r14,_DEAR(r1)
 	std	r15,_ESR(r1)
 	ld	r14,PACA_EXGEN+EX_R14(r13)
 	ld	r15,PACA_EXGEN+EX_R15(r13)
@@ -1057,7 +1057,7 @@ bad_stack_book3e:
 	std	r11,_CCR(r1)
 	mfspr	r10,SPRN_DEAR
 	mfspr	r11,SPRN_ESR
-	std	r10,_DAR(r1)
+	std	r10,_DEAR(r1)
 	std	r11,_ESR(r1)
 	std	r0,GPR0(r1);		/* save r0 in stackframe */	    \
 	std	r2,GPR2(r1);		/* save r2 in stackframe */	    \
-- 
2.30.2