ELR_EL3 Exception Link Register (EL3) when EL3 is implemented and FEAT_AA64 is implemented When taking an exception to EL3, holds the address to return to. Special ELR_EL3 is a 64-bit register. ADDR Return address 63 0 63:0 Return address. An exception return from EL3 using AArch64 makes ELR_EL3 become UNKNOWN. AU MRS <Xt>, ELR_EL3 if !(HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then Undefined(); elsif PSTATE.EL == EL2 then Undefined(); elsif PSTATE.EL == EL3 then X{64}(t) = ELR_EL3(); end; MSR ELR_EL3, <Xt> if !(HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then Undefined(); elsif PSTATE.EL == EL2 then Undefined(); elsif PSTATE.EL == EL3 then if IsFeatureImplemented(FEAT_GCS) && GetCurrentEXLOCKEN() && !Halted() && PSTATE.EXLOCK == '1' then EXLOCKException(); else ELR_EL3() = X{64}(t); end; end; 2026-03-26 20:27:25 2026-03_rel