DBGAUTHSTATUS, Debug Authentication Status register
The DBGAUTHSTATUS characteristics are:
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 required in all implementations.
Attributes
DBGAUTHSTATUS is a 32-bit register.
Field descriptions
The DBGAUTHSTATUS bit assignments are:
Bits [31:8]
Reserved, RES0.
SNID, bits [7:6]
When ARMv8.4-Debug is implemented:
When ARMv8.4-Debug is implemented:
Secure Non-Invasive Debug.
This field has the same value as DBGAUTHSTATUS.SID.
Otherwise:
Otherwise:
Secure Non-Invasive Debug.
| SNID | Meaning |
|---|---|
| 0b00 |
Not implemented. EL3 is not implemented and the Effective value of SCR.NS is 1. |
| 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 |
Not implemented. EL3 is not implemented and the Effective value of SCR_EL3.NS is 1. |
| 0b10 |
Implemented and disabled. ExternalSecureInvasiveDebugEnabled() == FALSE. |
| 0b11 |
Implemented and enabled. ExternalSecureInvasiveDebugEnabled() == TRUE. |
All other values are reserved.
NSNID, bits [3:2]
When ARMv8.4-Debug is implemented:
When ARMv8.4-Debug is implemented:
Non-secure Non-invasive debug.
| NSNID | Meaning |
|---|---|
| 0b00 |
Not implemented. EL3 is not implemented and the Effective value of SCR.NS is 0. |
| 0b11 |
Implemented and enabled. EL3 is implemented or the Effective value of SCR.NS is 1. |
All other values are reserved.
Otherwise:
Otherwise:
Non-secure Non-Invasive Debug.
| NSNID | Meaning |
|---|---|
| 0b00 |
Not implemented. EL3 is not implemented and the Effective value of SCR.NS is 0 |
| 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 |
Not implemented. EL3 is not implemented or the Effective value of SCR_EL3.NS is 0. |
| 0b10 |
Implemented and disabled. ExternalInvasiveDebugEnabled() == FALSE. |
| 0b11 |
Implemented and enabled. ExternalInvasiveDebugEnabled() == TRUE. |
All other values are reserved.
Accessing the DBGAUTHSTATUS
Accesses to this register use the following encodings:
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 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
AArch64.AArch32SystemAccessTrap(EL3, 0x05);
else
return DBGAUTHSTATUS;
elsif PSTATE.EL == EL2 then
if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
AArch64.AArch32SystemAccessTrap(EL3, 0x05);
else
return DBGAUTHSTATUS;
elsif PSTATE.EL == EL3 then
return DBGAUTHSTATUS;