Subject: [PATCH v7 12/42] powerpc/64s: add do_bad_page_fault_segv handler

From: Nicholas Piggin <[email-masked]>
Date: Sat, 30 Jan 2021 23:08:22 +1000

This function acts like an interrupt handler so it needs to follow
the standard interrupt handler function signature which will be
introduced in a future change.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/include/asm/bug.h       | 1 +
 arch/powerpc/kernel/exceptions-64s.S | 4 +---
 arch/powerpc/mm/fault.c              | 7 +++++++
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
index 4220789b9a97..8f09ddae9305 100644
--- a/arch/powerpc/include/asm/bug.h
+++ b/arch/powerpc/include/asm/bug.h
@@ -114,6 +114,7 @@ struct pt_regs;
 long do_page_fault(struct pt_regs *);
 void bad_page_fault(struct pt_regs *, int);
 void __bad_page_fault(struct pt_regs *regs, int sig);
+void do_bad_page_fault_segv(struct pt_regs *regs);
 extern void _exception(int, struct pt_regs *, int, unsigned long);
 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
 extern void die(const char *, struct pt_regs *, long);
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 839dcb94eea7..b90d3cde14cf 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2151,9 +2151,7 @@ EXC_COMMON_BEGIN(h_data_storage_common)
 	GEN_COMMON h_data_storage
 	addi    r3,r1,STACK_FRAME_OVERHEAD
 BEGIN_MMU_FTR_SECTION
-	ld	r4,_DAR(r1)
-	li	r5,SIGSEGV
-	bl      bad_page_fault
+	bl      do_bad_page_fault_segv
 MMU_FTR_SECTION_ELSE
 	bl      unknown_exception
 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX)
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 5dd3248b47c7..e476d7701413 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -615,3 +615,10 @@ void bad_page_fault(struct pt_regs *regs, int sig)
 	else
 		__bad_page_fault(regs, sig);
 }
+
+#ifdef CONFIG_PPC_BOOK3S_64
+void do_bad_page_fault_segv(struct pt_regs *regs)
+{
+	bad_page_fault(regs, SIGSEGV);
+}
+#endif
-- 
2.23.0