Debug Authentication Status Register
Provides information about the state of the IMPLEMENTATION DEFINED authentication interface for debug.
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.
DBGAUTHSTATUS_EL1 is a 64-bit register.
| 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 | |||||||||||||||||||||
Reserved, RES0.
Root non-invasive debug.
This field has the same value as DBGAUTHSTATUS_EL1.RTID.
Root invasive debug.
| 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.
Reserved, RES0.
Realm non-invasive debug.
This field has the same value as DBGAUTHSTATUS_EL1.RLID.
Realm invasive debug.
| 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.
Reserved, RES0.
Secure non-invasive debug.
This field has the same value as DBGAUTHSTATUS_EL1.SID.
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.
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.
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.
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.
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.
Accesses to this register use the following encodings in the System register encoding space:
MRS <Xt>, DBGAUTHSTATUS_EL1
(op0 = 0b10, op1 = 0b000, CRn = 0b0111, CRm = 0b1110, op2 = 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); else X[t, 64] = DBGAUTHSTATUS_EL1; 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); else X[t, 64] = DBGAUTHSTATUS_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = DBGAUTHSTATUS_EL1;
Version 2025.09 — Copyright © 2010-2025 Arm Limited or its affiliates.
This site is provided as a community resource and is NOT affiliated with nor endorsed by Arm Limited.