DBGVCR32

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DBGVCR32_EL2, Debug Vector Catch Register

Purpose

Allows access to the AArch32 register DBGVCR from AArch64 state only. Its value has no effect on execution in AArch64 state.

Configuration

AArch64 System register DBGVCR32_EL2 bits [31:0] are architecturally mapped to AArch32 System register DBGVCR[31:0].

This register is present only when FEAT_AA32EL1 is implemented and FEAT_AA64 is implemented. Otherwise, direct accesses to DBGVCR32_EL2 are UNDEFINED.

If EL2 is not implemented but EL3 is implemented, and EL1 is capable of using AArch32, then this register is not RES0.

Attributes

Field descriptions

When EL3 is implemented:

Bits [63:32]

NSF, bit [31]

NSI, bit [30]

Bit [29]

NSD, bit [28]

Data Abort exception vector catch enable in Non-secure state.

The exception vector offset is 0x10.

The reset behavior of this field is:

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

NSP, bit [27]

Prefetch Abort vector catch enable in Non-secure state.

The exception vector offset is 0x0C.

The reset behavior of this field is:

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

NSS, bit [26]

Supervisor Call (SVC) vector catch enable in Non-secure state.

The exception vector offset is 0x08.

The reset behavior of this field is:

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

NSU, bit [25]

Undefined Instruction vector catch enable in Non-secure state.

The exception vector offset is 0x04.

The reset behavior of this field is:

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

Bits [24:8]

SF, bit [7]

SI, bit [6]

Bit [5]

SD, bit [4]

Data Abort exception vector catch enable in Secure state.

The exception vector offset is 0x10.

The reset behavior of this field is:

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

SP, bit [3]

Prefetch Abort vector catch enable in Secure state.

The exception vector offset is 0x0C.

The reset behavior of this field is:

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

SS, bit [2]

Supervisor Call (SVC) vector catch enable in Secure state.

The exception vector offset is 0x08.

The reset behavior of this field is:

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

SU, bit [1]

Undefined Instruction vector catch enable in Secure state.

The exception vector offset is 0x04.

The reset behavior of this field is:

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

Bit [0]

When EL3 is not implemented:

Bits [63:8]

F, bit [7]

I, bit [6]

Bit [5]

D, bit [4]

P, bit [3]

S, bit [2]

U, bit [1]

Bit [0]

Accessing DBGVCR32_EL2

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

MRS <Xt>, DBGVCR32_EL2

op0	op1	CRn	CRm	op2
0b10	0b100	0b0000	0b0111	0b000

if !(IsFeatureImplemented(FEAT_AA32EL1) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif !IsFeatureImplemented(FEAT_AA32EL1) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = DBGVCR32_EL2(); end; elsif PSTATE.EL == EL3 then X{64}(t) = DBGVCR32_EL2(); end;

MSR DBGVCR32_EL2, <Xt>

op0	op1	CRn	CRm	op2
0b10	0b100	0b0000	0b0111	0b000

if !(IsFeatureImplemented(FEAT_AA32EL1) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif !IsFeatureImplemented(FEAT_AA32EL1) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else DBGVCR32_EL2() = X{64}(t); end; elsif PSTATE.EL == EL3 then DBGVCR32_EL2() = X{64}(t); end;

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
NSF	NSI	RES0	NSD	NSP	NSS	NSU	RES0																	SF	SI	RES0	SD	SP	SS	SU	RES0

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
RES0																								F	I	RES0	D	P	S	U	RES0