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Shared Debug.Authentication Pseudocode
Library pseudocode for shared/debug/authentication/AllowExternalDebugAccess
// AllowExternalDebugAccess() // ========================== // Returns TRUE if an external debug interface access to the External debug registers // is allowed, FALSE otherwise. boolean AllowExternalDebugAccess() // The access may also be subject to OS Lock, power-down, etc. if HaveSecureExtDebugView() then return AllowExternalDebugAccess(IsAccessSecure()); else return AllowExternalDebugAccess(ExternalSecureInvasiveDebugEnabled()); // AllowExternalDebugAccess() // ========================== // Returns TRUE if an external debug interface access to the External debug registers // is allowed for the given Security state, FALSE otherwise. boolean AllowExternalDebugAccess(boolean allow_secure) // The access may also be subject to OS Lock, power-down, etc. if HaveSecureExtDebugView() || ExternalInvasiveDebugEnabled() then if allow_secure then return TRUE; elsif HaveEL(EL3) then if ELUsingAArch32(EL3) then return SDCR.EDAD == '0'; else return MDCR_EL3.EDAD == '0'; else return !IsSecure(); else return FALSE;
Library pseudocode for shared/debug/authentication/AllowExternalPMUAccess
// AllowExternalPMUAccess() // ======================== // Returns TRUE if an external debug interface access to the PMU registers is allowed, FALSE otherwise. boolean AllowExternalPMUAccess() // The access may also be subject to OS Lock, power-down, etc. if HaveSecureExtDebugView() then return AllowExternalPMUAccess(IsAccessSecure()); else return AllowExternalPMUAccess(ExternalSecureNoninvasiveDebugEnabled()); // AllowExternalPMUAccess() // ======================== // Returns TRUE if an external debug interface access to the PMU registers is allowed for the given // Security state, FALSE otherwise. boolean AllowExternalPMUAccess(boolean allow_secure) // The access may also be subject to OS Lock, power-down, etc. if HaveSecureExtDebugView() || ExternalNoninvasiveDebugEnabled() then if allow_secure then return TRUE; elsif HaveEL(EL3) then if ELUsingAArch32(EL3) then return SDCR.EPMAD == '0'; else return MDCR_EL3.EPMAD == '0'; else return !IsSecure(); else return FALSE;
Library pseudocode for shared/debug/authentication/Debug_authentication
signal DBGEN; signal NIDEN; signal SPIDEN; signal SPNIDEN;
Library pseudocode for shared/debug/authentication/ExternalInvasiveDebugEnabled
// ExternalInvasiveDebugEnabled() // ============================== // The definition of this function is IMPLEMENTATION DEFINED. // In the recommended interface, this function returns the state of the DBGEN signal. boolean ExternalInvasiveDebugEnabled() return DBGEN == HIGH;
Library pseudocode for shared/debug/authentication/ExternalNoninvasiveDebugAllowed
// ExternalNoninvasiveDebugAllowed() // ================================= // Returns TRUE if Trace and PC Sample-based Profiling are allowed boolean ExternalNoninvasiveDebugAllowed() return (ExternalNoninvasiveDebugEnabled() && (!IsSecure() || ExternalSecureNoninvasiveDebugEnabled() || (ELUsingAArch32(EL1) && PSTATE.EL == EL0 && SDER.SUNIDEN == '1')));
Library pseudocode for shared/debug/authentication/ExternalNoninvasiveDebugEnabled
// ExternalNoninvasiveDebugEnabled() // ================================= // This function returns TRUE if the ARMv8.4-Debug is implemented, otherwise this // function is IMPLEMENTATION DEFINED. // In the recommended interface, ExternalNoninvasiveDebugEnabled returns the state of the (DBGEN // OR NIDEN) signal. boolean ExternalNoninvasiveDebugEnabled() return !HaveNoninvasiveDebugAuth() || ExternalInvasiveDebugEnabled() || NIDEN == HIGH;
Library pseudocode for shared/debug/authentication/ExternalSecureInvasiveDebugEnabled
// ExternalSecureInvasiveDebugEnabled() // ==================================== // The definition of this function is IMPLEMENTATION DEFINED. // In the recommended interface, this function returns the state of the (DBGEN AND SPIDEN) signal. // CoreSight allows asserting SPIDEN without also asserting DBGEN, but this is not recommended. boolean ExternalSecureInvasiveDebugEnabled() if !HaveEL(EL3) && !IsSecure() then return FALSE; return ExternalInvasiveDebugEnabled() && SPIDEN == HIGH;
Library pseudocode for shared/debug/authentication/ExternalSecureNoninvasiveDebugEnabled
// ExternalSecureNoninvasiveDebugEnabled() // ======================================= // This function returns the value of ExternalSecureInvasiveDebugEnabled() when ARMv8.4-Debug // is implemented. Otherwise, the definition of this function is IMPLEMENTATION DEFINED. // In the recommended interface, this function returns the state of the (DBGEN OR NIDEN) AND // (SPIDEN OR SPNIDEN) signal. boolean ExternalSecureNoninvasiveDebugEnabled() if !HaveEL(EL3) && !IsSecure() then return FALSE; if HaveNoninvasiveDebugAuth() then return ExternalNoninvasiveDebugEnabled() && (SPIDEN == HIGH || SPNIDEN == HIGH); else return ExternalSecureInvasiveDebugEnabled();