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authorK.Prasad <prasad@linux.vnet.ibm.com>2010-03-29 23:59:25 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-04-07 14:44:38 +1000
commit9c7cc234dc5edf5379fbbab4973f6704f59bc57b (patch)
tree6129dffa0ffc36da27718059c9b2ff40b74aa16b /arch/powerpc/kernel/exceptions-64s.S
parent578b7cd1518f8d1b17a7fb1671d3d756c9cb49f1 (diff)
powerpc: Disable interrupts for data breakpoint exceptions
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>
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
-rw-r--r--arch/powerpc/kernel/exceptions-64s.S13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index e3be98ffe2a..3e423fbad6b 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -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