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powerpc/6xx: Handle DABR match before calling do_page_fault 

On legacy 6xx 32-bit procesors, we checked for the DABR match bit
in DSISR from do_page_fault(), in the middle of a pile of ifdef's
because all other CPU types do it in assembly prior to calling
do_page_fault. Fix that.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[mpe: Add #ifdef CONFIG_6xx]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-07-19 14:49:25 +10:00 committed by Michael Ellerman
parent c433ec0455
commit d300627c6a
2 changed files with 15 additions and 9 deletions
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15
arch/powerpc/kernel/entry_32.S
View File

@ -586,7 +586,11 @@ ppc_swapcontext:
handle_page_fault:
stw r4,_DAR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
andis. r0,r5,DSISR_DABRMATCH@h
#ifdef CONFIG_6xx
bne- handle_dabr_fault
bl do_page_fault
#endif
cmpwi r3,0
beq+ ret_from_except
SAVE_NVGPRS(r1)
@ -599,6 +603,17 @@ handle_page_fault:
bl bad_page_fault
b ret_from_except_full
#ifdef CONFIG_6xx
/* We have a data breakpoint exception - handle it */
handle_dabr_fault:
SAVE_NVGPRS(r1)
lwz r0,_TRAP(r1)
clrrwi r0,r0,1
stw r0,_TRAP(r1)
bl do_break
b ret_from_except_full
#endif
/*
* This routine switches between two different tasks. The process
* state of one is saved on its kernel stack. Then the state

9
arch/powerpc/mm/fault.c
View File

@ -242,15 +242,6 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address,
goto bail;
}
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE) || \
defined(CONFIG_PPC_BOOK3S_64) || defined(CONFIG_PPC_8xx))
if (error_code & DSISR_DABRMATCH) {
/* breakpoint match */
do_break(regs, address, error_code);
goto bail;
}
#endif
/* We restore the interrupt state now */
if (!arch_irq_disabled_regs(regs))
local_irq_enable();