Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
[SPARC64]: Fix trap state reading for instruction_access_exception.
1) Read ASI_IMMU SFSR not ASI_DMMU.
2) IMMU has no SFAR, read TPC instead
3) Delete old and incorrect comment about the DTLB protection
trap having a dependency on the SFSR contents in order to
function correctly
Signed-off-by: David S. Miller <davem@davemloft.net>
+4
-11
arch/sparc64/kernel/entry.S
+4
-11
arch/sparc64/kernel/entry.S
···
690
690
retl
691
691
nop
692
692
693
-
/* These next few routines must be sure to clear the
694
-
* SFSR FaultValid bit so that the fast tlb data protection
695
-
* handler does not flush the wrong context and lock up the
696
-
* box.
697
-
*/
698
693
.globl __do_data_access_exception
699
694
.globl __do_data_access_exception_tl1
700
695
__do_data_access_exception_tl1:
···
728
733
rdpr %pstate, %g4
729
734
wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
730
735
mov TLB_SFSR, %g3
731
-
mov DMMU_SFAR, %g5
732
-
ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
733
-
ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
736
+
ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
737
+
rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
734
738
stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
735
739
membar #Sync
736
740
sethi %hi(109f), %g7
···
746
752
rdpr %pstate, %g4
747
753
wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
748
754
mov TLB_SFSR, %g3
749
-
mov DMMU_SFAR, %g5
750
-
ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
751
-
ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
755
+
ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
756
+
rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
752
757
stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
753
758
membar #Sync
754
759
sethi %hi(109f), %g7