DBGOSDLR Debug OS Double Lock Register when FEAT_AA32EL1 is implemented OSDLR_EL1 Architectural AArch64 31 0 31 0 31 0 31 0 Locks out the external debug interface. Debug DBGOSDLR is a 32-bit register. 31 1 31:1 Reserved, RES0. DLK 0 0 0 OS Double Lock control bit. 0b0 OS Double Lock unlocked. 0b1 OS Double Lock locked, if DBGPRCR.CORENPDRQ (Core no powerdown request) bit is set to 0 and the PE is in Non-debug state. '0' When FEAT_DoubleLock is implemented 0 0 0 Reserved, RAZ/WI. Otherwise MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !IsFeatureImplemented(FEAT_AA32EL1) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && MDCR_EL2().[TDE,TDOSA] != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL2.TDOSA")) then AArch64_AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HDCR().[TDE,TDOSA] != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by HDCR.TDOSA")) then AArch32_TakeHypTrapException(0x05); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x05); end; else R(t) = DBGOSDLR(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x05); end; else R(t) = DBGOSDLR(); end; elsif PSTATE.EL == EL3 then R(t) = DBGOSDLR(); end; MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !IsFeatureImplemented(FEAT_AA32EL1) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && MDCR_EL2().[TDE,TDOSA] != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL2.TDOSA")) then AArch64_AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HDCR().[TDE,TDOSA] != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by HDCR.TDOSA")) then AArch32_TakeHypTrapException(0x05); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x05); end; else DBGOSDLR() = R(t); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x05); end; else DBGOSDLR() = R(t); end; elsif PSTATE.EL == EL3 then DBGOSDLR() = R(t); end; 2026-03-26 20:27:25 2026-03_rel