DBGCLAIMSET_EL1 Debug CLAIM Tag Set Register when FEAT_AA64 is implemented DBGCLAIMCLR_EL1 Architectural AArch64 63 0 63 0 63 0 63 0 DBGCLAIMSET Architectural AArch32 31 0 31 0 31 0 31 0 DBGCLAIMCLR Architectural AArch32 31 0 31 0 31 0 31 0 DBGCLAIMSET_EL1 Architectural External 31 0 31 0 31 0 31 0 DBGCLAIMCLR_EL1 Architectural External 31 0 31 0 31 0 31 0 Used by software to set the CLAIM tag bits to 1. The architecture does not define any functionality for the CLAIM tag bits. CLAIM tags are typically used for communication between the debugger and target software. Used in conjunction with the DBGCLAIMCLR_EL1 register. Debug An implementation must include eight CLAIM tag bits. DBGCLAIMSET_EL1 is a 64-bit register. 63 32 63:32 Reserved, RES0. 31 8 31:8 Reserved, RAZ/WI. CLAIM<m> 7 0 7:0 Claim Tag Set. Used to set Claim Tag bit <m> to 1. 7 0 0b0 On a write: Ignored. 0b1 On a write: Set Claim Tag bit <m> to 1. RAO/W1S MRS <Xt>, DBGCLAIMSET_EL1 if !IsFeatureImplemented(FEAT_AA64) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && HDFGRTR_EL2().DBGCLAIM == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2().[TDE,TDA] != '00' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = DBGCLAIMSET_EL1(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = DBGCLAIMSET_EL1(); end; elsif PSTATE.EL == EL3 then X{64}(t) = DBGCLAIMSET_EL1(); end; MSR DBGCLAIMSET_EL1, <Xt> if !IsFeatureImplemented(FEAT_AA64) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && HDFGWTR_EL2().DBGCLAIM == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2().[TDE,TDA] != '00' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else DBGCLAIMSET_EL1() = X{64}(t); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDA == '1' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDA == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else DBGCLAIMSET_EL1() = X{64}(t); end; elsif PSTATE.EL == EL3 then DBGCLAIMSET_EL1() = X{64}(t); end; 2026-03-26 20:27:25 2026-03_rel