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powerpc/64s: add do_bad_page_fault_segv handler 

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 <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-13-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-01-30 23:08:22 +10:00 committed by Michael Ellerman
parent 8458c628a5
commit 71f47976fa
3 changed files with 9 additions and 3 deletions
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1
arch/powerpc/include/asm/bug.h
View File

@ -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);

4
arch/powerpc/kernel/exceptions-64s.S
View File

@ -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)

7
arch/powerpc/mm/fault.c
View File

@ -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