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Fujitsu Fujitsu SPARC64 V manual Expected Software Handling of ADE Trap

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TABLE P-14defines each instruction end-method after an ADE trap.

TABLE P-14Instruction End-Method After async_data_error Exception

	Precise	Retryable But Not Precise	Not Retryable

Instructions executed after	Ended (Committed).
the last ADE, IAE, or DAE	The instructions without UGE complete as defined in the architecture. The
trap and before the trapped	instruction with UGE was unpredictable value to its output (destination register or,
instruction referenced by	in the case of a store instruction, destination memory location).
TPC.

The trapped instruction	Not executed.	The output of the instruction is	The output of the instruction is
referenced by TPC		incomplete.	incomplete.
		Part of the output may be	Part of the output may be
		changed, or the invalid value	changed, or the invalid value
		may be written to the instruction	may be written to the instruction
		output. However, the	output. However, the
		modification to the invalid target	modification to the invalid target
		that is not defined as instruction	that is not defined as instruction
		output is not executed.	output is not executed.
		The following modifications are	A store to an invalid address is
		not executed:	not executed. (Store to a valid
		• Store to the cacheable area	address with uncorrected data
		including cache.	may be executed.)
		• Store to the noncacheable area.
		• Output to the source register of
		the instruction (destructive
		overlap)

Instructions to be executed	Not executed.	Not executed.	Not executed.
after the instruction
referenced by TPC

The possibility of resuming	Possible.	Possible.	Impossible.
the trapped program by
executing the RETRY
instruction to the %tpc
when the trapped program
is not damaged at the
single-ADEtrap

P.4.4 Expected Software Handling of ADE Trap

The expected software handling of an ADE trap is described by the pseudo C code below. The main purpose of this flow is to recover from the following errors as much as possible:

■An error in the CPU internal RAM or register file

■An error in the accumulator

■An error in the CPU internal temporary registers and data bus

Release 1.0, 1 July 2002

F. Chapter P Error Handling 171

Image 182

Fujitsu Fujitsu SPARC64 V manual Expected Software Handling of ADE Trap

Contents

Sparc JPS1 Release 1.0, 1 July Chapter Page Contents Instructions TrapsImplementation Dependencies Sparc JPS1 Implementation-Dependent TrapsMemory Models Cache Organization 125 Cache Types Level-1 Instruction Cache L1I CacheFatal Error Reset, REDstate, and errorstate 137 Reset TypesError Handling 149 Error Classification Asistchgerrorinfo Index UPA Programmer’s ModelGeneral References Page Fonts and Notational Conventions OverviewNavigating the SPARC64 V Implementation Supplement High Integration SPARC64 V processorMicroarchitecture for High Performance High Reliability and High IntegrityExtended RAS interface to software Advanced RAS features for cachesAdvanced RAS features for the core Asynchronous data error ADE trap for additional errors Component OverviewSX-Unit 1Instruction Control Unit Major Blocks Instruction Control Unit IUExecution Unit EU 2Execution Unit Major BlocksStorage Unit SU Storage Unit Major BlocksSecondary Cache and External Access Unit SXU 4Secondary Cache and External Access Unit Major BlocksDefinitions Instruction dispatch Synonym instruction initiationIssue-stalling Sync Synonym machine sync Page Architectural Overview Page Data Formats Please refer to , Data Formats in CommonalityPage Registers Nonprivileged RegistersFSRversion ver Floating-Point State Register FSRFSRnonstandardfp NS FSRfloating-pointtraptype fttTrap State Tstate Register Privileged RegistersTick Tick Register FSR ConformancePerformance Control Register PCR ASR Version VER RegisterAncillary State Registers ASRs 1shows the values for the VER register for SPARC64OVF OvroPerformance Instrumentation Counter PIC Register ASR Accessibility as described above impl. dep. #250Registers Referenced Through ASIs Dispatch Control Register DCR ASRPM70 VM70Data Watchpoint Registers Floating-Point Deferred-Trap Queue FQIU Deferred-Trap Queue Instruction Trap RegisterData Prefetch InstructionsInstruction Execution Instruction Prefetch Syncing Instructions 1SPARC64 V Syncing InstructionsYes Instruction Formats and Fields2Instruction Fields Specific to SPARC64 Call and Jmpl Instructions Instruction CategoriesControl-Transfer Instructions CTIs Control transfer CTIFloating-Point Operate FPop Instructions Implementation-Dependent InstructionsProcessor Pipeline Instruction Fetch StagesBrhis Issue Stages Execution StagesExecution Stages for Cache Access Completion StagesPlease refer to .1 of Commonality TrapsProcessor States, Normal and Special Traps REDstate Trap Table ErrorstateREDstate REDstate Execution EnvironmentDeferred Traps Reset TrapsTrap Categories Uses of the Trap CategoriesPIL Control Trap ControlTrap-Table Entry Addresses Trap Type TTDetails of Supported Traps Trap ProcessingException and Interrupt Descriptions Sparc JPS1 Implementation-Dependent TrapsPage Memory Models Sparc V9 Memory Model onSparc V9 Memory Model Mode ControlOverview Synchronizing Instruction and Data MemoryRelease 1.0, 1 July Memory Models Page Instruction Definitions SPARC64 V Extensions Table A-1Implementation-Specific InstructionsPage Block Load and Store Instructions VIS Invalid Valid Call and Link Implementation-Dependent InstructionsFloating-Point Multiply-Add/Subtract FormatPage Operation, and inexact, respectively Non-Trapping cexc When FSR.NS =Non-Trapping aexc When FSR.NS = Exceptions fpdisabled Jump and LinkLoad Quadword, Atomic Physical Format 3 LddaMemory Barrier Order Constraints Imposed by mmask Bits Bits in the cmask Field01816 Partial Store VISPrefetch Data Table A-7Prefetch Variants Read State RegisterTable A-7describes prefetch variants implemented in SPARC64 Store Barrier Write State RegisterDeprecated Instructions Page Traps Inhibiting Results Floating-Point Nonstandard ModeIeee Std 754-1985 Requirements for Fpexceptionother Exception ftt=unfinishedFPop UnfinishedFPop Boundary Conditions Denormalized number, eres is less than zeroGenerates an unfinishedFPop exception Pessimistic Zero Table B-2unfinishedFPop Boundary ConditionsTable B-3Conditions for a Pessimistic Zero Operation Under FSR.NS =Pessimistic Overflow Table B-4Pessimistic Overflow ConditionsFloating-Point Exceptional Conditions and Results UnfinishedFPop4Nonarithmetic Operations Under FSR.NS = Yes and op2 Nv, dNaNPage Please refer to Section C.1 of Commonality Implementation DependenciesDefinition of an Implementation Dependency List of Implementation Dependencies Hardware CharacteristicsImplementation Dependency Categories Please refer to Section C.2 of CommonalityTable C-1SPARC64 V Implementation Dependencies Errorstate processor state Reset trapEntering errorstate on implementation-dependent errors Deferred trapsFlush instruction Data access FPU trapClean windows trap Floating-point underflow detectionIMPDEPn instructions SIRenable control flagMMU disabled prefetch behavior Unimplemented LDD trapCoherence and atomicity of memory operations Implicit ASI when TLUnimplemented values for PSTATE.MM Implementation-dependent memory modelTable C-1SPARC64 V Implementation Dependencies 7 Table C-1SPARC64 V Implementation Dependencies 8 Table C-1SPARC64 V Implementation Dependencies 9 Table C-1SPARC64 V Implementation Dependencies 10 257 255256 258Formal Specification of the Memory Models Please refer to Appendix D of CommonalityPage Opcode Maps Instruction65Page Memory Management Unit Virtual Address TranslationTranslation Table Entry TTE Table F-1Organization of SPARC64 V TLBsRelease 1.0, 1 July Chapter F Memory Management Unit TSB Pointer Formation TSB OrganizationTSB Pointer Formation Faults and Traps TLB miss 64 16-67Instructionaccessexception Reset, Disable, and REDstate Behavior Internal Registers and ASI operations Accessing MMU RegistersAccess Modes Supervisor read/write Asimcntl Memory Control RegisterRMD 10.4 I/D TLB Data In, Data Access, and Tag Read RegistersTable F-3MCNTL Field Description JPS1TSBPPage Table F-4MMU TLB Data Access Address Assignment TLB#MMU TLB Tag Access Register Kbyte page entry10.7 I/D TSB Extension Registers 10.9 I/D Synchronous Fault Status Registers I-SFSR, D-SFSRMMU I/D Synchronous Fault Status Registers I-SFSR, D-SFSR TSB Base RegistersTable F-5I-SFSRBit Description EIDSFSRBit Description FT60 Error DescriptionTable F-6describes the field encoding for ISFSR.FT Isfsr Update Policy Table F-8D-SFSRBit Description 1Table F-8D-SFSRBit Description 2 Table F-9defines the encoding of the FT60 field SFSRBit Description 3Fresh fault or miss3 MMU Synchronous Fault Status Register FT Fault Type FieldDsfsr Update Policy Kbytes Table F-10DSFSR Update PolicyMMU Bypass Table F-11Bypass Attribute Bits on SPARC64Restriction of sTLB Entry Direct Replacement TLB Replacement PolicyAutomatic TLB Replacement Rule Page Assembly Language Syntax Please refer to Appendix G of CommonalityPage Software Considerations Please refer to Appendix H of CommonalityPage Extending the Sparc V9 Architecture Please refer to Appendix I of CommonalityPage Changes from Sparc V8 to Sparc Please refer to Appendix K of CommonalityPage Programming with the Memory Models Please refer to Appendix J of CommonalityPage SPARC64 V ASI Assignments 1 Address Space IdentifiersSPARC64 V ASI Assignments SPARC64 V ASI Assignments 2 TBDSpecial Memory Access ASIs SPARC64 V ASI Assignments 3Block Load and Store ASIs Partial Store ASIsHigh-Speed Lbsy Read Mechanism Barrier Assist for Parallel ProcessingInterface Definition Lbsy Control Register ASICLBSYR0, ASICLBSYR1 ASI RegistersHigh-Speed BST Write Mechanism Bstw Control Register ASICBSTW0, ASICBSTW1 Bstw Busy Status Register AsicbstwbusyEF16 Last Barrier Synchronization Status Read ASILBSYR0Barrier State Write ASIBSTW0, ASIBSTW1 Read Write is ignoredCache Organization Cache TypesTable M-1L1I Cache Characteristics Level-1 Instruction Cache L1I CacheLevel-1 Data Cache L1D Cache Table M-2L1D Cache CharacteristicsTable M-3L2 Cache Characteristics Level-2 Unified Cache L2 CacheTable M-4Relationships Between Cache Coherency Protocols Cache Coherency ProtocolsCache Control/Status Instructions Table M-5L2 Cache Moesi StatesFlush Level-1 Instruction Cache ASIFLUSHL1ITable M-6ASIL2CTRL Register Bits 3 L2 Diagnostics Tag ReadLevel-2 Cache Control Register ASIL2CTRL 4 L2 Diagnostics Tag Read Registers ASIL2DIAGTAGREADREGPage Interrupt Handling Interrupt DispatchMembar Interrupt Receive Figure N-2is an example of the interrupt receive flowInterrupt Vector Dispatch Register Interrupt Global RegistersInterrupt-Related ASR Registers Interrupt Vector Dispatch Status RegisterPower-on Reset POR Reset, REDstate, and errorstateReset Types Appendix contains these sectionsSoftware-Initiated Reset SIR Watchdog Reset WDRExternally Initiated Reset XIR REDstate and errorstate Figure O-1illustrates the processor state transition diagramPA = 000007FFF000000016 Integer registers Processor State after Reset and in REDstateCPU Fatal Error state Floating Point registersTBA6315 Mask dependentCounter Table O-2ASR State after Reset and in REDstateASI Register State After Reset and in REDstate 1 ASI Register State After Reset and in REDstate 2 OthersASI Register State After Reset and in REDstate 3 Operating Status Register Opsr 11011 UnchangedTo be defined later Hardware Power-On Reset SequenceFirmware Initialization Sequence Page Fatal Error Error HandlingError Classification Instruction-Obstructing Error Errorstate Transition ErrorUrgent Error Urgent Error Independent of Instruction Execution Correctable Error CE, corrected by hardware Restrainable ErrorTraps for Urgent Errors Following registers are related to the error handling Action and Error ControlRegisters Related to Error Handling Table P-1Registers Related to Error HandlingTable P-2Action Upon Detection of an Error 1 Summary of Actions Upon Error DetectionTable P-2summarizes what happens when an error is detected Deviation in SPARC64 Table P-2Action Upon Detection of an Error 2Ideal specification Table P-2Action Upon Detection of an Error Error Marking for Cacheable Data Error Error Marking for Cacheable DataTable P-4Format of Error-Marked Data Format of Error-Marking DataTable P-3Syndrome for Data Marked for Error Table P-6shows the Errormarkid set by the CPU Table P-5ERRORMARKID Bit DescriptionDifference Between Error Marking on SPARC64 IV Table P-7Error Marking on SPARC64 IV and SPARC64Table P-8 Asieidr Bit Description Control of Error Action AsierrorcontrolValue in ASIERRORCONTROL, as defined in Table P-9 RteueWeaked Ugehandler4C16 Fatal Error and errorstate Transition ErrorTable P-10Format of Asistchgerrorinfo Bit Description Always 0 EeotherCurrent SPARC64 V implementation Fatal Error TypesTypes of errorstate Transition Errors Table P-11ASIUGESR Bit Description 1 Urgent ErrorIdeal specification not implemented Table P-11ASIUGESR Bit Description 2 Table P-11ASIUGESR Bit Description 3 Table P-11ASIUGESR Bit Description 4 Action of asyncdataerror ADE TrapConditions that cause ADE trap Instend Priv Mugedae Mugeiae MugeiugeFollowing actions are executed in this order Set the specific register settingFollowing three sets of registers are updated State transitionUpon completion of a Retry or Done instruction Update of ASIUGESR, as shown in Table P-13Instruction End-Method at ADE Trap InstendExpected Software Handling of ADE Trap Void ExpectedsoftwarehandlingofADEtrap See Appendix F, Memory Management Unit, for details Instruction Access ErrorsData Access Errors Restrainable Errors Asiasyncfaultstatus AsiafsrDGL1$U2$STLB CeincomedUERAWL2$INSD UedstbetoUERAWL2$FILL Implementation Deviation SPARC64 V setsContents WAYASIASYNCFAULTADDRU2 register is described in Table P-17 SyndromeExpected Software Handling of Restrainable Errors Contents of PABIT423Page Table P-18shows error handling for most registers Handling of Internal Register ErrorsRegister Error Handling Excluding ASRs and ASI Registers Terminology used in Table P-18is defined as followsTable P-19ASR Error Handling ASR Error HandlingTable P-19shows the handling of ASR errors ADE trap, WTerminology used in Table P-20is defined as follows ASI Register Error HandlingError Protect Parity AlwaysError Detect Condition Error Type CorrectionTable P-20shows the handling of ASI register errors Table P-20Handling of ASI Register ErrorsTable P-20Handling of ASI Register Errors SPARC64 V Implementation and the Ideal Specification Cache Error HandlingHandling of a Cache Tag Error Error in D1 Cache Tag and I1 Cache TagError in U2 Unified Level 2 Cache Tag Correctable Error in D1 Cache Data Handling of an I1 Cache Data ErrorHandling of a D1 Cache Data Error Marked Uncorrectable Error in D1 Cache Data Marked Uncorrectable Error in U2 Cache Data Handling of a U2 Cache Data ErrorCorrectable Error in U2 Cache Data Raw Uncorrectable Error in U2 Cache DataI1 Cache Way Reduction Automatic Way Reduction of I1 Cache, D1 Cache, and U2 CacheWay Reduction Condition D1 Cache Way Reduction U2 Cache Way ReductionError in TLB Entry Detected on Ldxa Instruction Access TLB Error HandlingHandling of TLB Entry Errors Table P-22Error Protection and Detection of TLB EntriesAutomatic Way Reduction of sTLB Handling of Extended UPA Data Bus Error Handling of Extended UPA Bus Interface ErrorHandling of Extended UPA Address Bus Error STLB Way ReductionCorrectable Error on Extended UPA Data Bus UE in Outgoing Data to Extended UPA Data Bus Page Sample Pseudocodes Performance InstrumentationPerformance Monitor Overview Counter Clear/SetCounter Event Selection and Start Counter Stop and ReadPerformance Monitor Description Table Q-1Events and Encoding of Performance MonitorInstruction Statistics Events and Encoding of Performance MonitorInstruction Count instructioncounts Counts the committed Floating Multiply-and-Add instructionsTrap-Related Statistics Counts the occurrences of instruction uTLB misses MMU Event CountersCounts the occurrences of Tcc instructions Counts the occurrences of data uTLB missesCounts the occurrences of D1 cache misses Cache Event CountersCounts the occurrences of I1 cache misses Counts the total latency of I1 cache missesCounts the occurrences of L2 cache miss by demand access Counts L2 cache references by demand read accessCounts the number of Scpireq packets received UPA Event CountersCounts the number of Sinvreq packets received Counts the number of Scpbreq packets receivedMiscellaneous Counters Barrier-Assist ASI Read Count asirdbarPage Table R-1shows the mapping of the CPU’s UPA port slave area UPA Programmer’s ModelMapping of the CPU’s UPA Port Slave Area Table R-1CPU’s UPA Port Slave Area MappingUPA PortID Register Table R-2UPA PortID Register FieldsUPA PortID Register Fields UPA Config RegisterTable R-3UPA Config Register Description UpacapUPA Config Register Description MID PconUPCCAP2 UpccapPage Summary of Differences between SPARC64 V and UltraSPARC-III SPARC64 V and UltraSPARC-III Differences 1Table T-1SPARC64 V and UltraSPARC-III Differences 2 UPATable T-1SPARC64 V and UltraSPARC-III Differences 3 SfsrPage Please refer to Bibliography in Commonality BibliographyGeneral References Page Index AugePage ASIINTRW133 Page Error detection action155 DAEDGL1$L2$STLB error194 DGL1$U2$STLB error195 On Jmpl instruction error53 update during MMU trap90 DmmuECCerror exception46, 153, 155 Persistence38Statistics monitoring206-207 FQ17 FSRImmu Update during MMU trap90 IsfsrLddfa instruction80 PSO41 RMO41OBP Release 1.0, 1 July Chapter Index PTE Release 1.0, 1 July Chapter Index Page TLB UnimplementedFPop floating-point trap type70 UITLB10, 85, 90 uncorrectable error152Way reduction194 uDTLB10, 85