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powerpc: Disable interrupts for data breakpoint exceptions

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Data address breakpoint exceptions are currently handled along with page-faults
which require interrupts to remain in enabled state. Since exception handling
for data breakpoints aren't pre-empt safe, we handle them separately.

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
K.Prasad
2010-03-29 23:59:25 +00:00
committed by Benjamin Herrenschmidt
parent 578b7cd151
commit 9c7cc234dc
2 changed files with 15 additions and 3 deletions
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13
arch/powerpc/kernel/exceptions-64s.S
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@@ -735,8 +735,11 @@ _STATIC(do_hash_page)
std r3,_DAR(r1)
std r4,_DSISR(r1)
andis. r0,r4,0xa450 /* weird error? */
andis. r0,r4,0xa410 /* weird error? */
bne- handle_page_fault /* if not, try to insert a HPTE */
andis. r0,r4,DSISR_DABRMATCH@h
bne- handle_dabr_fault
BEGIN_FTR_SECTION
andis. r0,r4,0x0020 /* Is it a segment table fault? */
bne- do_ste_alloc /* If so handle it */
@@ -823,6 +826,14 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
bl .raw_local_irq_restore
b 11f
/* We have a data breakpoint exception - handle it */
handle_dabr_fault:
ld r4,_DAR(r1)
ld r5,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
bl .do_dabr
b .ret_from_except_lite
/* Here we have a page fault that hash_page can't handle. */
handle_page_fault:
ENABLE_INTS