DBGAUTHSTATUS, Debug Authentication Status register

The DBGAUTHSTATUS characteristics are:

Purpose

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

This register is part of the Debug registers functional group.

Configuration

There is one instance of this register that is used in both Secure and Non-secure states.

AArch32 System register DBGAUTHSTATUS is architecturally mapped to AArch64 System register DBGAUTHSTATUS_EL1.

AArch32 System register DBGAUTHSTATUS is architecturally mapped to External register DBGAUTHSTATUS_EL1.

This register is required in all implementations.

Attributes

DBGAUTHSTATUS is a 32-bit register.

Field descriptions

The DBGAUTHSTATUS bit assignments are:

313029282726252423222120191817161514131211109876543210
000000000000000000000000SNIDSIDNSNIDNSID

Bits [31:8]

Reserved, RES0.

SNID, bits [7:6]

Secure non-invasive debug. Possible values of this field are:

SNIDMeaning
00

Not implemented. EL3 is not implemented and the implemented Security state is Non-secure state.

10

Implemented and disabled. ExternalSecureNoninvasiveDebugEnabled() == FALSE.

11

Implemented and enabled. ExternalSecureNoninvasiveDebugEnabled() == TRUE.

Other values are reserved.

SID, bits [5:4]

Secure invasive debug. Possible values of this field are:

SIDMeaning
00

Not implemented. EL3 is not implemented and the implemented Security state is Non-secure state.

10

Implemented and disabled. ExternalSecureInvasiveDebugEnabled() == FALSE.

11

Implemented and enabled. ExternalSecureInvasiveDebugEnabled() == TRUE.

Other values are reserved.

NSNID, bits [3:2]

Non-secure non-invasive debug. Possible values of this field are:

NSNIDMeaning
00

Not implemented. EL3 is not implemented and the implemented Security state is Secure state.

10

Implemented and disabled. ExternalNoninvasiveDebugEnabled() == FALSE.

11

Implemented and enabled. ExternalNoninvasiveDebugEnabled() == TRUE.

Other values are reserved.

NSID, bits [1:0]

Non-secure invasive debug. Possible values of this field are:

NSIDMeaning
00

Not implemented. EL3 is not implemented and the implemented Security state is Secure state.

10

Implemented and disabled. ExternalInvasiveDebugEnabled() == FALSE.

11

Implemented and enabled. ExternalInvasiveDebugEnabled() == TRUE.

Other values are reserved.

Accessing the DBGAUTHSTATUS

This register can be read using MRC with the following syntax:

MRC <syntax>

This syntax uses the following encoding in the System instruction encoding space:

<syntax> opc1opc2CRncoprocCRm
p14, 0, <Rt>, c7, c14, 6000110011111101110

Accessibility

The register is accessible as follows:

Control Accessibility
E2HTGENSEL0EL1EL2EL3
xx0 - RO n/a RO
x01 - RORORO
x11 - n/a RORO

This table applies to all instructions that can access this register.

Traps and enables

For a description of the prioritization of any generated exceptions, see section G1.11.2 (Exception priority order) in the ARM® Architecture Reference Manual, ARMv8, for ARMv8-A architecture profile for exceptions taken to AArch32 state, and section D1.13.2 (Synchronous exception prioritization) for exceptions taken to AArch64 state. Subject to the prioritization rules, the following traps and enables are applicable when accessing this register.

When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 :

When EL2 is implemented and is using AArch32 and SCR_EL3.NS==1 :

When EL3 is implemented and is using AArch64 :




18/04/2017 17:00

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