PMBSR_EL3

Reserved, RES0.

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.

MSS2 encoding for other Profiling Buffer management events

23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0

Bits [23:0]

Reserved, RES0.

MSS2 encoding for stage 1 or stage 2 Data Aborts on write to Profiling Buffer

23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0															TopLevel	AssuredOnly	Overlay	DirtyBit	RES0

Bits [23:9]

Reserved, RES0.

TopLevel, bit [8]
When FEAT_THE is implemented:

TopLevel. Indicates if the fault was due to TopLevel.

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

Otherwise:

Reserved, RES0.

AssuredOnly, bit [7]
When FEAT_THE is implemented, PMBSR_EL3.EC == 0b100101, and GetPMBSR_EL3_FSC() IN {0b0011xx}:

AssuredOnly flag. If a memory access generates a stage 2 Data Abort, then this field holds information about the fault.

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

Otherwise:

Reserved, RES0.

Overlay, bit [6]
When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and GetPMBSR_EL3_FSC() IN {0b0011xx}:

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

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

Otherwise:

Reserved, RES0.

DirtyBit, bit [5]
When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and GetPMBSR_EL3_FSC() IN {0b0011xx}:

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.

DirtyBit	Meaning
0b0	Permission Fault is not due to dirty state.
0b1	Permission Fault is due to dirty state.

Otherwise:

Reserved, RES0.

Bits [4:0]

Reserved, RES0.

MSS2 encoding for Granule Protection Check faults on write to Profiling Buffer

23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0

Bits [23:0]

Reserved, RES0.

MSS2 encoding for Profiling Buffer management event for an IMPLEMENTATION DEFINED reason

23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
IMPLEMENTATION DEFINED

IMPLEMENTATION DEFINED, bits [23:0]

IMPLEMENTATION DEFINED.

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

EC	Meaning	MSS	MSS2	Applies when
0b000000	Other Profiling Buffer management event. All Profiling Buffer management events other than those described by the other defined Event class codes.	MSS encoding for other Profiling Buffer management events	MSS2 encoding for other Profiling Buffer management events
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. Synchronous 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.	MSS encoding for Granule Protection Check faults on write to Profiling Buffer	MSS2 encoding for Granule Protection Check faults on write to Profiling Buffer	When FEAT_RME is implemented
0b011111	Profiling Buffer management event for an IMPLEMENTATION DEFINED reason.	MSS encoding for Profiling Buffer management event for an IMPLEMENTATION DEFINED reason	MSS2 encoding for Profiling 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 Profiling Buffer	MSS2 encoding for stage 1 or stage 2 Data Aborts on write to Profiling Buffer
0b100101	Stage 2 Data Abort on write to Profiling Buffer.	MSS encoding for stage 1 or stage 2 Data Aborts on write to Profiling Buffer	MSS2 encoding for stage 1 or stage 2 Data Aborts on write to Profiling Buffer

All other values are reserved.

The reset behavior of this field is:

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

Reserved, RES0.

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.

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.

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.

Service. Indicates that a Profiling Buffer management event has been recorded.

S	Meaning
0b0	No Profiling Buffer management event for EL3 has been recorded.
0b1	A Profiling Buffer management event for EL3 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

The reset behavior of this field is:

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

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.

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.

MSS encoding for other Profiling 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]

Profiling Buffer status code

BSC	Meaning
0b000000	Collection not stopped, or access not allowed.
0b000001	Profiling Buffer filled.
0b000100	Buffer size. The requested Profiling Buffer size was too large.

All other values are reserved.

MSS encoding for stage 1 or stage 2 Data Aborts on write to Profiling 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 Granule Protection Check faults on write to Profiling Buffer

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 Profiling 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.

63	62	61	60	59	58	57	56	55	54	53	52	51	50	49	48	47	46	45	44	43	42	41	40	39	38	37	36	35	34	33	32
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0								MSS2
EC						RES0						DL	EA	S	COLL	MSS

PMBSR_EL3, Profiling Buffer Syndrome Register (EL3)

Purpose

Configuration

Attributes

Field descriptions

Bits [63:56]

MSS2, bits [55:32]

MSS2 encoding for other Profiling Buffer management events

Bits [23:0]

MSS2 encoding for stage 1 or stage 2 Data Aborts on write to Profiling Buffer

Bits [23:9]

TopLevel, bit [8]When FEAT_THE is implemented:

Otherwise:

AssuredOnly, bit [7]When FEAT_THE is implemented, PMBSR_EL3.EC == 0b100101, and GetPMBSR_EL3_FSC() IN {0b0011xx}:

Otherwise:

Overlay, bit [6]When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and GetPMBSR_EL3_FSC() IN {0b0011xx}:

Otherwise:

DirtyBit, bit [5]When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and GetPMBSR_EL3_FSC() IN {0b0011xx}:

Otherwise:

Bits [4:0]

MSS2 encoding for Granule Protection Check faults on write to Profiling Buffer

Bits [23:0]

MSS2 encoding for Profiling Buffer management event for an IMPLEMENTATION DEFINED reason

IMPLEMENTATION DEFINED, bits [23:0]

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 other Profiling Buffer management events

Bits [15:6]

BSC, bits [5:0]

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

Bits [15:6]

FSC, bits [5:0]

MSS encoding for Granule Protection Check faults on write to Profiling Buffer

Bits [15:0]

MSS encoding for Profiling Buffer management event for an IMPLEMENTATION DEFINED reason

IMPLEMENTATION DEFINED, bits [15:0]

Accessing PMBSR_EL3

MRS <Xt>, PMBSR_EL3

MSR PMBSR_EL3, <Xt>

TopLevel, bit [8]
When FEAT_THE is implemented:

AssuredOnly, bit [7]
When FEAT_THE is implemented, PMBSR_EL3.EC == 0b100101, and GetPMBSR_EL3_FSC() IN {0b0011xx}:

Overlay, bit [6]
When (FEAT_S1POE is implemented or FEAT_S2POE is implemented) and GetPMBSR_EL3_FSC() IN {0b0011xx}:

DirtyBit, bit [5]
When (FEAT_S1PIE is implemented or FEAT_S2PIE is implemented) and GetPMBSR_EL3_FSC() IN {0b0011xx}: