From: David S. Miller Date: Mon, 29 Aug 2005 19:44:40 +0000 (-0700) Subject: [SPARC64]: Fix trap state reading for instruction_access_exception. X-Git-Tag: accepted/tizen/common/20141203.182822~44034 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5ea68e02766c52c153c62fc423cda659a80e45fa;p=platform%2Fkernel%2Flinux-arm64.git [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 --- diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S index 88332f0..6d0476f 100644 --- a/arch/sparc64/kernel/entry.S +++ b/arch/sparc64/kernel/entry.S @@ -690,11 +690,6 @@ netbsd_syscall: retl nop - /* These next few routines must be sure to clear the - * SFSR FaultValid bit so that the fast tlb data protection - * handler does not flush the wrong context and lock up the - * box. - */ .globl __do_data_access_exception .globl __do_data_access_exception_tl1 __do_data_access_exception_tl1: @@ -733,9 +728,8 @@ __do_instruction_access_exception_tl1: rdpr %pstate, %g4 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate mov TLB_SFSR, %g3 - mov DMMU_SFAR, %g5 - ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR - ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR + ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR + rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit membar #Sync sethi %hi(109f), %g7 @@ -752,9 +746,8 @@ __do_instruction_access_exception: rdpr %pstate, %g4 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate mov TLB_SFSR, %g3 - mov DMMU_SFAR, %g5 - ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR - ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR + ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR + rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit membar #Sync sethi %hi(109f), %g7