DBGAUTHSTATUS: Debug Authentication Status register

Purpose

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

Configuration

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

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

This register is present only when EL1 is capable of using AArch32. Otherwise, direct accesses to DBGAUTHSTATUS are UNDEFINED.

This register is required in all implementations.

Attributes

DBGAUTHSTATUS is a 32-bit register.

Field descriptions

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																								SNID		SID		NSNID		NSID

Bits [31:8]

Reserved, RES0.

SNID, bits [7:6]

When FEAT_Debugv8p4 is implemented:

Secure Non-Invasive Debug.

This field has the same value as DBGAUTHSTATUS.SID.

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.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

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

MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coproc	opc1	CRn	CRm	opc2
0b1110	0b000	0b0111	0b1110	0b110

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then AArch64.AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDA> != '00' then AArch32.TakeHypTrapException(0x05); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else R[t] = DBGAUTHSTATUS; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else R[t] = DBGAUTHSTATUS; elsif PSTATE.EL == EL3 then R[t] = DBGAUTHSTATUS;