PMBSR_EL1

Provides syndrome information to software for a Profiling Buffer management event.

Configuration

This register is present only when FEAT_SPE is implemented. Otherwise, direct accesses to PMBSR_EL1 are UNDEFINED.

Attributes

Field descriptions

Bits [63:41]

TopLevel, bit [40]
When FEAT_THE is implemented and EC IN {0b10010x}:

TopLevel.

Indicates if the fault was due to TopLevel.

TopLevel	Meaning
0b0	Fault is not due to TopLevel.
0b1	Fault is due to TopLevel.

For any other fault, this field is RES0.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Otherwise:

AssuredOnly, bit [39]
When FEAT_THE is implemented and EC IN {0b10010x}:

AssuredOnly flag.

If a memory access generates a Stage 2 Data Abort, this field holds information about the fault.

AssuredOnly	Meaning
0b0	The Data Abort is not due to AssuredOnly.
0b1	The Data Abort is due to AssuredOnly.

For any other fault, this field is RES0.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Otherwise:

Overlay, bit [38]
When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and EC IN {0b10010x}:

Overlay flag.

If a memory access generates a Data Abort for a Permission fault, this field holds information about the fault.

Overlay	Meaning
0b0	The Data Abort is not due to Overlay Permissions.
0b1	The Data Abort is due to Overlay Permissions.

For any other fault, this field is RES0.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Otherwise:

DirtyBit, bit [37]
When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and EC IN {0b10010x}:

DirtyBit flag.

If a write access to memory generates a Data Abort for a Permission fault using Indirect Permission, this field holds information about the fault.

DirtyBit	Meaning
0b0	The Permission Fault is not due to nDirty State or Dirty State.
0b1	The Permission Fault is due to nDirty State or Dirty State.

For any other fault or Access, this field is RES0.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Otherwise:

Bits [36:32]

EC, bits [31:26]

Event class. Top-level description of the cause of the buffer management event.

EC	Meaning	MSS	Applies when
0b000000	Other buffer management event. All buffer management events other than those described by other defined Event class codes.	MSS encoding for other buffer management events
0b011110	Granule Protection Check fault, other than GPF, on write to Profiling Buffer.	MSS encoding for Granule Protection Check fault	When FEAT_RME is implemented
0b011111	Buffer management event for an IMPLEMENTATION DEFINED reason.	MSS encoding for a buffer management event for an IMPLEMENTATION DEFINED reason
0b100100	Stage 1 Data Abort on write to Profiling Buffer.	MSS encoding for stage 1 or stage 2 Data Aborts on write to buffer
0b100101	Stage 2 Data Abort on write to Profiling Buffer.	MSS encoding for stage 1 or stage 2 Data Aborts on write to buffer

All other values are reserved. Reserved values might be defined in a future version of the architecture.

Writing a reserved value to this field will make the value of this field UNKNOWN. Values that are not supported act as reserved values when writing to this register.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Bits [25:20]

DL, bit [19]

Partial record lost.

Following a buffer management event other than an asynchronous External abort, indicates whether the last record written to the Profiling Buffer is complete.

DL	Meaning
0b0	PMBPTR_EL1 points to the first byte after the last complete record written to the Profiling Buffer.
0b1	Part of a record was lost because of a buffer management event or synchronous External abort. PMBPTR_EL1 might not point to the first byte after the last complete record written to the buffer, and so restarting collection might result in a data record stream that software cannot parse. All records prior to the last record have been written to the buffer.

When the buffer management event was because of an asynchronous External abort, this bit is set to 1 and software must not assume that any valid data has been written to the Profiling Buffer.

This bit is RES0 if the PE never sets this bit as a result of a buffer management event caused by an asynchronous External abort.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

EA, bit [18]

External abort.

EA	Meaning
0b0	An External abort has not been asserted.
0b1	An External abort has been asserted and detected by the Statistical Profiling Unit.

This bit is RES0 if the PE never sets this bit as the result of an External abort.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

S, bit [17]

Service

S	Meaning
0b0	PMBIRQ is not asserted.
0b1	PMBIRQ is asserted. All profiling data has either been written to the buffer or discarded.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

COLL, bit [16]

Collision detected.

COLL	Meaning
0b0	No collision events detected.
0b1	At least one collision event was recorded.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

MSS, bits [15:0]

Management Event Specific Syndrome.

Contains syndrome specific to the management event.

The syndrome contents for each management event are described in the following sections.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

MSS encoding for stage 1 or stage 2 Data Aborts on write to buffer

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0										FSC

Bits [15:6]

Reserved, RES0.

FSC, bits [5:0]

Fault status code

FSC	Meaning	Applies when
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_HAFDBS is implemented

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'.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

MSS encoding for other buffer management events

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0										BSC

Bits [15:6]

Reserved, RES0.

BSC, bits [5:0]

Buffer status code

BSC	Meaning
0b000000	Buffer not filled
0b000001	Buffer filled

All other values are reserved. Reserved values might be defined in a future version of the architecture.

Writing a reserved value to this field will make the value of this field UNKNOWN. Values that are not supported act as reserved values when writing to this register.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

MSS encoding for Granule Protection Check fault

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0

Bits [15:0]

Reserved, RES0.

MSS encoding for a buffer management event for an IMPLEMENTATION DEFINED reason

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
IMPLEMENTATION DEFINED

IMPLEMENTATION DEFINED, bits [15:0]

IMPLEMENTATION DEFINED.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Accessing PMBSR_EL1

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, PMBSR_EL1

op0	op1	CRn	CRm	op2
0b11	0b000	0b1001	0b1010	0b011

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.PMBSR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.E2PB IN {'x0'} then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EffectiveHCR_EL2_NVx() IN {'1x1'} then X[t, 64] = NVMem[0x820]; else X[t, 64] = PMBSR_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = PMBSR_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = PMBSR_EL1;

MSR PMBSR_EL1, <Xt>

op0	op1	CRn	CRm	op2
0b11	0b000	0b1001	0b1010	0b011

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.PMBSR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.E2PB IN {'x0'} then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EffectiveHCR_EL2_NVx() IN {'1x1'} then NVMem[0x820] = X[t, 64]; else PMBSR_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then UNDEFINED; elsif HaveEL(EL3) && (MDCR_EL3.NSPB[0] == '0' || MDCR_EL3.NSPB[1] != SCR_EL3.NS || (IsFeatureImplemented(FEAT_RME) && MDCR_EL3.NSPBE != SCR_EL3.NSE)) then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else PMBSR_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then PMBSR_EL1 = X[t, 64];

PMBSR_EL1, Profiling Buffer Status/syndrome Register (EL1)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:41]

TopLevel, bit [40]
When FEAT_THE is implemented and EC IN {0b10010x}:

Otherwise:

AssuredOnly, bit [39]
When FEAT_THE is implemented and EC IN {0b10010x}:

Otherwise:

Overlay, bit [38]
When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and EC IN {0b10010x}:

Otherwise:

DirtyBit, bit [37]
When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and EC IN {0b10010x}:

Otherwise:

Bits [36:32]

EC, bits [31:26]

Bits [25:20]

DL, bit [19]

EA, bit [18]

S, bit [17]

COLL, bit [16]

MSS, bits [15:0]

MSS encoding for stage 1 or stage 2 Data Aborts on write to buffer

Bits [15:6]

FSC, bits [5:0]

MSS encoding for other buffer management events

Bits [15:6]

BSC, bits [5:0]

MSS encoding for Granule Protection Check fault

Bits [15:0]

MSS encoding for a buffer management event for an IMPLEMENTATION DEFINED reason

IMPLEMENTATION DEFINED, bits [15:0]

Accessing PMBSR_EL1

MRS <Xt>, PMBSR_EL1

MSR PMBSR_EL1, <Xt>

PMBSR_EL1, Profiling Buffer Status/syndrome Register (EL1)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:41]

TopLevel, bit [40]When FEAT_THE is implemented and EC IN {0b10010x}:

Otherwise:

AssuredOnly, bit [39]When FEAT_THE is implemented and EC IN {0b10010x}:

Otherwise:

Overlay, bit [38]When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and EC IN {0b10010x}:

Otherwise:

DirtyBit, bit [37]When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and EC IN {0b10010x}:

Otherwise:

Bits [36:32]

EC, bits [31:26]

Bits [25:20]

DL, bit [19]

EA, bit [18]

S, bit [17]

COLL, bit [16]

MSS, bits [15:0]

MSS encoding for stage 1 or stage 2 Data Aborts on write to buffer

Bits [15:6]

FSC, bits [5:0]

MSS encoding for other buffer management events

Bits [15:6]

BSC, bits [5:0]

MSS encoding for Granule Protection Check fault

Bits [15:0]

MSS encoding for a buffer management event for an IMPLEMENTATION DEFINED reason

IMPLEMENTATION DEFINED, bits [15:0]

Accessing PMBSR_EL1

MRS <Xt>, PMBSR_EL1

MSR PMBSR_EL1, <Xt>

TopLevel, bit [40]
When FEAT_THE is implemented and EC IN {0b10010x}:

AssuredOnly, bit [39]
When FEAT_THE is implemented and EC IN {0b10010x}:

Overlay, bit [38]
When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and EC IN {0b10010x}:

DirtyBit, bit [37]
When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and EC IN {0b10010x}: