DBGAUTHSTATUS

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DBGAUTHSTATUS_EL1, Debug Authentication Status Register

Purpose

Provides information about the state of the IMPLEMENTATION DEFINED authentication interface for debug.

Configuration

AArch64 System register DBGAUTHSTATUS_EL1 bits [31:0] are architecturally mapped to AArch32 System register DBGAUTHSTATUS[31:0].

AArch64 System register DBGAUTHSTATUS_EL1 bits [31:0] are architecturally mapped to External register DBGAUTHSTATUS_EL1[31:0].

This register is present only when FEAT_AA64 is implemented. Otherwise, direct accesses to DBGAUTHSTATUS_EL1 are UNDEFINED.

Attributes

Field descriptions

Bits [63:28]

RTNID, bits [27:26]

RTID, bits [25:24]

Root invasive debug.

RTID	Meaning
0b00	Not implemented.
0b10	Implemented and disabled. ExternalRootInvasiveDebugEnabled() == FALSE.
0b11	Implemented and enabled. ExternalRootInvasiveDebugEnabled() == TRUE.

RTID

Meaning

0b00

Not implemented.

0b10

Implemented and disabled.

ExternalRootInvasiveDebugEnabled() == FALSE.

0b11

Implemented and enabled.

ExternalRootInvasiveDebugEnabled() == TRUE.

All other values are reserved.

If FEAT_RME is not implemented, the only permitted value is 0b00.

Bits [23:16]

RLNID, bits [15:14]

RLID, bits [13:12]

Realm invasive debug.

RLID	Meaning
0b00	Not implemented.
0b10	Implemented and disabled. ExternalRealmInvasiveDebugEnabled() == FALSE.
0b11	Implemented and enabled. ExternalRealmInvasiveDebugEnabled() == TRUE.

RLID

Meaning

0b00

Not implemented.

0b10

Implemented and disabled.

ExternalRealmInvasiveDebugEnabled() == FALSE.

0b11

Implemented and enabled.

ExternalRealmInvasiveDebugEnabled() == TRUE.

All other values are reserved.

If FEAT_RME is not implemented, the only permitted value is 0b00.

Bits [11:8]

SNID, bits [7:6]
When FEAT_Debugv8p4 is implemented:

Otherwise:

Secure non-invasive debug.

SNID	Meaning
0b00	Secure state is not implemented.
0b10	Implemented and disabled. ExternalSecureNoninvasiveDebugEnabled() == FALSE.
0b11	Implemented and enabled. ExternalSecureNoninvasiveDebugEnabled() == TRUE.

All other values are reserved.

SID, bits [5:4]

Secure invasive debug.

SID	Meaning
0b00	Secure state is not implemented.
0b10	Implemented and disabled. ExternalSecureInvasiveDebugEnabled() == FALSE.
0b11	Implemented and enabled. ExternalSecureInvasiveDebugEnabled() == TRUE.

All other values are reserved.

NSNID, bits [3:2]
When FEAT_Debugv8p4 is implemented:

Non-secure non-invasive debug.

NSNID	Meaning
0b00	Non-secure state is not implemented.
0b11	Implemented and enabled. EL3 is implemented or the Effective value of SCR_EL3.NS is 1.

All other values are reserved.

Otherwise:

Non-secure non-invasive debug.

NSNID	Meaning
0b00	Non-secure state is not implemented.
0b10	Implemented and disabled. ExternalNoninvasiveDebugEnabled() == FALSE.
0b11	Implemented and enabled. ExternalNoninvasiveDebugEnabled() == TRUE.

All other values are reserved.

NSID, bits [1:0]

Non-secure invasive debug.

NSID	Meaning
0b00	Non-secure state is not implemented.
0b10	Implemented and disabled. ExternalInvasiveDebugEnabled() == FALSE.
0b11	Implemented and enabled. ExternalInvasiveDebugEnabled() == TRUE.

All other values are reserved.

Accessing DBGAUTHSTATUS_EL1

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

MRS <Xt>, DBGAUTHSTATUS_EL1

op0	op1	CRn	CRm	op2
0b10	0b000	0b0111	0b1110	0b110

if !IsFeatureImplemented(FEAT_AA64) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && HDFGRTR_EL2().DBGAUTHSTATUS_EL1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2().[TDE,TDA] != '00' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = DBGAUTHSTATUS_EL1(); 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) = DBGAUTHSTATUS_EL1(); end; elsif PSTATE.EL == EL3 then X{64}(t) = DBGAUTHSTATUS_EL1(); 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
RES0				RTNID		RTID		RES0								RLNID		RLID		RES0				SNID		SID		NSNID		NSID

DBGAUTHSTATUS_EL1, Debug Authentication Status Register

Purpose

Configuration

Attributes

Field descriptions

Bits [63:28]

RTNID, bits [27:26]

RTID, bits [25:24]

Bits [23:16]

RLNID, bits [15:14]

RLID, bits [13:12]

Bits [11:8]

SNID, bits [7:6]When FEAT_Debugv8p4 is implemented:

Otherwise:

SID, bits [5:4]

NSNID, bits [3:2]When FEAT_Debugv8p4 is implemented:

Otherwise:

NSID, bits [1:0]

Accessing DBGAUTHSTATUS_EL1

MRS <Xt>, DBGAUTHSTATUS_EL1

SNID, bits [7:6]
When FEAT_Debugv8p4 is implemented:

NSNID, bits [3:2]
When FEAT_Debugv8p4 is implemented: