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powerpc/64s: move bad_page_fault handling to C

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This simplifies code, and it is also useful when introducing
interrupt handler wrappers when introducing wrapper functionality
that doesn't cope with asm entry code calling into more than one
handler function.

32-bit and 64e still have some such cases, which limits some ways
they can use interrupt wrappers.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-15-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-01-30 23:08:24 +10:00 committed by Michael Ellerman
parent 4cb8428465
commit f4c03b0e52
2 changed files with 4 additions and 12 deletions
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12
arch/powerpc/kernel/exceptions-64s.S
View File

@ -1447,12 +1447,6 @@ BEGIN_MMU_FTR_SECTION
MMU_FTR_SECTION_ELSE
bl do_page_fault
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
cmpdi r3,0
beq+ interrupt_return
mr r5,r3
addi r3,r1,STACK_FRAME_OVERHEAD
ld r4,_DAR(r1)
bl __bad_page_fault
b interrupt_return
1: bl do_break
@ -1557,12 +1551,6 @@ BEGIN_MMU_FTR_SECTION
MMU_FTR_SECTION_ELSE
bl do_page_fault
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
cmpdi r3,0
beq+ interrupt_return
mr r5,r3
addi r3,r1,STACK_FRAME_OVERHEAD
ld r4,_DAR(r1)
bl __bad_page_fault
b interrupt_return
GEN_KVM instruction_access

4
arch/powerpc/mm/fault.c
View File

@ -557,6 +557,10 @@ long do_page_fault(struct pt_regs *regs)
if (likely(entry)) {
instruction_pointer_set(regs, extable_fixup(entry));
err = 0;
} else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
/* 32 and 64e handle this in asm */
__bad_page_fault(regs, err);
err = 0;
}
out: