ERXSTATUS_EL1 Selected Error Record Primary Status Register when FEAT_RAS is implemented ERXSTATUS Architectural AArch32 31 0 31 0 31 0 31 0 Accesses ERR<n>STATUS for the error record <n> selected by ERRSELR_EL1.SEL. RAS ERXSTATUS_EL1 is a 64-bit register. ERRnSTATUS 63 0 63:0 ERXSTATUS_EL1 accesses ERR<n>STATUS, where <n> is the value in ERRSELR_EL1.SEL. If ERRIDR_EL1.NUM is 0x0000 or ERRSELR_EL1.SEL is greater than or equal to ERRIDR_EL1.NUM, then one of the following occurs: An UNKNOWN error record is selected. ERXSTATUS_EL1 is RAZ/WI. Direct reads and writes of ERXSTATUS_EL1 are NOPs. Direct reads and writes of ERXSTATUS_EL1 are UNDEFINED. ERR<n>STATUS describes additional constraints that also apply when ERR<n>STATUS is accessed through ERXSTATUS_EL1. MRS <Xt>, ERXSTATUS_EL1 if !IsFeatureImplemented(FEAT_RAS) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3().TERR == '1' then Undefined(); elsif EL2Enabled() && HCR_EL2().TERR == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && HFGRTR_EL2().ERXSTATUS_EL1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3().TERR == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = ERRSTATUS(UInt(ERRSELR_EL1().SEL)); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3().TERR == '1' then Undefined(); elsif HaveEL(EL3) && SCR_EL3().TERR == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = ERRSTATUS(UInt(ERRSELR_EL1().SEL)); end; elsif PSTATE.EL == EL3 then X{64}(t) = ERRSTATUS(UInt(ERRSELR_EL1().SEL)); end; MSR ERXSTATUS_EL1, <Xt> if !IsFeatureImplemented(FEAT_RAS) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3().TERR == '1' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3().TWERR == '1' then Undefined(); elsif EL2Enabled() && HCR_EL2().TERR == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && HFGWTR_EL2().ERXSTATUS_EL1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3().TERR == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif HaveEL(EL3) && SCR_EL3().TWERR == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else ERRSTATUS(UInt(ERRSELR_EL1().SEL)) = X{64}(t); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3().TERR == '1' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3().TWERR == '1' then Undefined(); elsif HaveEL(EL3) && SCR_EL3().TERR == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif HaveEL(EL3) && SCR_EL3().TWERR == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else ERRSTATUS(UInt(ERRSELR_EL1().SEL)) = X{64}(t); end; elsif PSTATE.EL == EL3 then ERRSTATUS(UInt(ERRSELR_EL1().SEL)) = X{64}(t); end; 2026-03-26 20:27:25 2026-03_rel