PMBSR_EL3 Profiling Buffer Syndrome Register (EL3) when FEAT_SPE_EXC is implemented and EL3 is implemented Provides syndrome information to software for a Profiling Buffer management event. SPE PMBSR_EL3 is a 64-bit register. 63 56 63:56 Reserved, RES0. MSS2 55 32 55:32 Management event Specific Syndrome 2. Contains syndrome specific to the management event. The syndrome contents for each management event are described in the following sections. other Profiling Buffer management events 23 0 23:0 Reserved, RES0. stage 1 or stage 2 Data Aborts on write to Profiling Buffer 23 9 23:9 Reserved, RES0. TopLevel 8 8 0 TopLevel. Indicates if the fault was due to TopLevel. 0b0 Fault is not due to TopLevel. 0b1 Fault is due to TopLevel. When FEAT_THE is implemented 8 8 8 Reserved, RES0. Otherwise AssuredOnly 7 7 0 AssuredOnly flag. If a memory access generates a stage 2 Data Abort, then this field holds information about the fault. 0b0 Data Abort is not due to AssuredOnly. 0b1 Data Abort is due to AssuredOnly. When FEAT_THE is implemented, PMBSR_EL3.EC == '100101', and GetPMBSR_EL3_FSC() IN {'0011xx'} 7 7 7 Reserved, RES0. Otherwise Overlay 6 6 0 Overlay flag. If a memory access generates a Data Abort for a Permission fault, then this field holds information about the fault. 0b0 Data Abort is not due to Overlay Permissions. 0b1 Data Abort is due to Overlay Permissions. When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and GetPMBSR_EL3_FSC() IN {'0011xx'} 6 6 6 Reserved, RES0. Otherwise DirtyBit 5 5 0 DirtyBit flag. If a write access to memory generates a Data Abort for a Permission fault using Indirect Permission, then this field holds information about the fault. 0b0 Permission Fault is not due to dirty state. 0b1 Permission Fault is due to dirty state. When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and GetPMBSR_EL3_FSC() IN {'0011xx'} 5 5 5 Reserved, RES0. Otherwise 4 0 4:0 Reserved, RES0. When FEAT_RME is implemented Granule Protection Check faults on write to Profiling Buffer 23 0 23:0 Reserved, RES0. When FEAT_RME is implemented Profiling Buffer management event for an IMPLEMENTATION DEFINED reason IMPLEMENTATION DEFINED 23 0 23:0 IMPLEMENTATION DEFINED. EC 31 26 31:26 Event class. Top-level description of the cause of the Profiling Buffer management event. All other values are reserved. 0b000000 Other Profiling Buffer management event. All Profiling Buffer management events other than those described by the other defined Event class codes. 0b011110 Granule Protection Check fault on write to Profiling Buffer, other than Granule Protection Fault (GPF). That is, any of the following: Granule Protection Table (GPT) address size fault. GPT walk fault. External abort on GPT fetch. A GPF on translation table walk or update is reported as either a Stage 1 or Stage 2 Data Abort, as appropriate. Other GPFs are reported as a Stage 1 Data Abort. When FEAT_RME is implemented 0b011111 Profiling Buffer management event for an IMPLEMENTATION DEFINED reason. 0b100100 Stage 1 Data Abort on write to Profiling Buffer. 0b100101 Stage 2 Data Abort on write to Profiling Buffer. AU 25 20 25:20 Reserved, RES0. DL 19 19 19 Partial record lost. Following a buffer management event, indicates whether the last record written to the Profiling Buffer is complete. PMBSR_EL3.DL is also set to 1 when an asynchronous External abort is reported to the SPU. When the SPU sets this bit to 1, software must not assume that there is any valid data between the end of the last complete record and PMBPTR_EL1. If software restarts profiling from the saved PMBPTR_EL1 value, then this might result in buffer contents that software cannot parse. If PMBSR_EL3.EA is also set to 1 by the SPU, then software must not assume that any valid data has been written to the Profiling Buffer. This bit is RES0 if there are no circumstances when the PE would ever set this bit to 1 as a result of a Profiling Buffer management event. 0b0 PMBPTR_EL1 points to the first byte after the last complete record written to the Profiling Buffer by the SPU, and no asynchronous External abort has been reported to the SPU. 0b1 Part of a record was lost because of a Profiling Buffer management event, or an asynchronous External abort has been reported to the SPU. PMBPTR_EL1 might not be the address of the first byte after the last complete sample record written to the Profiling Buffer by the SPU. AU EA 18 18 0 External abort. It is IMPLEMENTATION DEFINED whether this field is set to 1 or is unchanged by the PE when a write by the Statistical Profiling Unit generates an External abort on a translation table walk, translation table update, or GPT walk that is reported as an MMU fault. When FEAT_SPEv1p3 is implemented, this field is not set to 1 by the PE for any other Profiling Buffer management event. 0b0 An External abort has not been asserted. 0b1 An External abort has been asserted and detected by the Statistical Profiling Unit. AU When the PE sets this bit as the result of an External abort 18 18 18 Reserved, RES0. Otherwise S 17 17 17 Service. Indicates that a Profiling Buffer management event has been recorded. When FEAT_SPE_EXC is implemented, this field indicates a management event for EL3. If the SPE Profiling exception for EL3 is enabled, then when this field is 1, an SPE Profiling exception for EL3 is pending 0b0 No Profiling Buffer management event for EL3 has been recorded. 0b1 A Profiling Buffer management event for EL3 has been recorded. AU COLL 16 16 16 Collision detected. 0b0 No collision events detected. 0b1 At least one collision event was recorded. AU MSS 15 0 15:0 Management Event Specific Syndrome. Contains syndrome specific to the Profiling Buffer management event. The syndrome contents for each Profiling Buffer management event are described in the following sections. other Profiling Buffer management events 15 6 15:6 Reserved, RES0. BSC 5 0 5:0 Profiling Buffer status code All other values are reserved. 0b000000 Collection not stopped, or access not allowed. 0b000001 Profiling Buffer filled. 0b000100 Buffer size. The requested Profiling Buffer size was too large. stage 1 or stage 2 Data Aborts on write to Profiling Buffer 15 6 15:6 Reserved, RES0. FSC 5 0 5:0 Fault status code All other values are reserved. It is IMPLEMENTATION DEFINED whether each of the Access Flag fault, asynchronous External abort and synchronous External abort, Alignment fault, and TLB Conflict abort values can be generated by the PE. For more information see 'Faults and Watchpoints'. 0b000000 Address size fault, level 0 of translation or translation table base register. 0b000001 Address size fault, level 1. 0b000010 Address size fault, level 2. 0b000011 Address size fault, level 3. 0b000100 Translation fault, level 0. 0b000101 Translation fault, level 1. 0b000110 Translation fault, level 2. 0b000111 Translation fault, level 3. 0b001001 Access flag fault, level 1. 0b001010 Access flag fault, level 2. 0b001011 Access flag fault, level 3. 0b001000 Access flag fault, level 0. When FEAT_LPA2 is implemented 0b001100 Permission fault, level 0. When FEAT_LPA2 is implemented 0b001101 Permission fault, level 1. 0b001110 Permission fault, level 2. 0b001111 Permission fault, level 3. 0b010000 Synchronous External abort, not on translation table walk or hardware update of translation table. 0b010001 Asynchronous External abort. 0b010010 Synchronous External abort on translation table walk or hardware update of translation table, level -2. When FEAT_D128 is implemented 0b010011 Synchronous External abort on translation table walk or hardware update of translation table, level -1. When FEAT_LPA2 is implemented 0b010100 Synchronous External abort on translation table walk or hardware update of translation table, level 0. 0b010101 Synchronous External abort on translation table walk or hardware update of translation table, level 1. 0b010110 Synchronous External abort on translation table walk or hardware update of translation table, level 2. 0b010111 Synchronous External abort on translation table walk or hardware update of translation table, level 3. 0b011011 Synchronous parity or ECC error on memory access on translation table walk or hardware update of translation table, level -1. When FEAT_LPA2 is implemented and FEAT_RAS is not implemented 0b100001 Alignment fault. 0b100010 Granule Protection Fault on translation table walk or hardware update of translation table, level -2. When FEAT_D128 is implemented and FEAT_RME is implemented 0b100011 Granule Protection Fault on translation table walk or hardware update of translation table, level -1. When FEAT_RME is implemented and FEAT_LPA2 is implemented 0b100100 Granule Protection Fault on translation table walk or hardware update of translation table, level 0. When FEAT_RME is implemented 0b100101 Granule Protection Fault on translation table walk or hardware update of translation table, level 1. When FEAT_RME is implemented 0b100110 Granule Protection Fault on translation table walk or hardware update of translation table, level 2. When FEAT_RME is implemented 0b100111 Granule Protection Fault on translation table walk or hardware update of translation table, level 3. When FEAT_RME is implemented 0b101000 Granule Protection Fault, not on translation table walk or hardware update of translation table. When FEAT_RME is implemented 0b101001 Address size fault, level -1. When FEAT_LPA2 is implemented 0b101010 Translation fault, level -2. When FEAT_D128 is implemented 0b101011 Translation fault, level -1. When FEAT_LPA2 is implemented 0b101100 Address Size fault, level -2. When FEAT_D128 is implemented 0b110000 TLB conflict abort. 0b110001 Unsupported atomic hardware update fault. When FEAT_HAF is implemented AU When FEAT_RME is implemented Granule Protection Check faults on write to Profiling Buffer 15 0 15:0 Reserved, RES0. When FEAT_RME is implemented Profiling Buffer management event for an IMPLEMENTATION DEFINED reason IMPLEMENTATION DEFINED 15 0 15:0 IMPLEMENTATION DEFINED. MRS <Xt>, PMBSR_EL3 if !(IsFeatureImplemented(FEAT_SPE_EXC) && HaveEL(EL3)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then Undefined(); elsif PSTATE.EL == EL2 then Undefined(); elsif PSTATE.EL == EL3 then X{64}(t) = PMBSR_EL3(); end; MSR PMBSR_EL3, <Xt> if !(IsFeatureImplemented(FEAT_SPE_EXC) && HaveEL(EL3)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then Undefined(); elsif PSTATE.EL == EL2 then Undefined(); elsif PSTATE.EL == EL3 then PMBSR_EL3() = X{64}(t); end; 2026-03-26 20:27:25 2026-03_rel