SDER32_EL2 AArch32 Secure Debug Enable Register when EL2 is implemented, FEAT_SEL2 is implemented, FEAT_AA32EL1 is implemented, and FEAT_AA64 is implemented SDER32_EL3 Architectural AArch64 63 0 63 0 63 0 63 0 when EL3 is implemented SDER Architectural AArch32 31 0 31 0 31 0 31 0 Allows access to the AArch32 register SDER from Secure EL2 and EL3 only. Generic System Control SDER32_EL2 is a 64-bit register. 63 2 63:2 Reserved, RES0. SUNIDEN 1 1 1 Secure User Non-Invasive Debug Enable. When Secure EL1 is using AArch32, the forms of non-invasive debug affected by this control are: The PC Sample-based Profiling Extension. See About the PC Sample-based Profiling Extension. When SelfHostedTraceEnabled() == FALSE, processor trace. When EL3 is implemented, Performance Monitors. When Secure EL1 is using AArch64, this bit has no effect. 0b0 This bit has no effect on non-invasive debug. 0b1 Non-invasive debug is allowed in Secure EL0 using AArch32. AU SUIDEN 0 0 0 Secure User Invasive Debug Enable. 0b0 This bit does not affect the generation of debug exceptions at Secure EL0. 0b1 If EL1 is using AArch32, debug exceptions from Secure EL0 are enabled. AU When EL3 is implemented 0 0 0 Reserved, RES0. Otherwise MRS <Xt>, SDER32_EL2 if !(HaveEL(EL2) && IsFeatureImplemented(FEAT_SEL2) && IsFeatureImplemented(FEAT_AA32EL1) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if !IsCurrentSecurityState(SS_Secure) then Undefined(); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if !IsCurrentSecurityState(SS_Secure) then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then AArch64_SystemAccessTrap(EL3, 0x18); else X{64}(t) = SDER32_EL2(); end; elsif PSTATE.EL == EL3 then if SCR_EL3().EEL2 == '0' then Undefined(); else X{64}(t) = SDER32_EL2(); end; end; MSR SDER32_EL2, <Xt> if !(HaveEL(EL2) && IsFeatureImplemented(FEAT_SEL2) && IsFeatureImplemented(FEAT_AA32EL1) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if !IsCurrentSecurityState(SS_Secure) then Undefined(); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if !IsCurrentSecurityState(SS_Secure) then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then AArch64_SystemAccessTrap(EL3, 0x18); else SDER32_EL2() = X{64}(t); end; elsif PSTATE.EL == EL3 then if SCR_EL3().EEL2 == '0' then Undefined(); else SDER32_EL2() = X{64}(t); end; end; 2026-03-26 20:27:25 2026-03_rel