Exception Link Register (EL3)
When taking an exception to EL3, holds the address to return to.
This register is present only when EL3 is implemented and FEAT_AA64 is implemented. Otherwise, direct accesses to ELR_EL3 are UNDEFINED.
This register is a Special-purpose register.
ELR_EL3 is a 64-bit register.
| 63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| ADDR | |||||||||||||||||||||||||||||||
| ADDR | |||||||||||||||||||||||||||||||
Return address.
An exception return from EL3 using AArch64 makes ELR_EL3 become UNKNOWN.
The reset behavior of this field is:
Accesses to this register use the following encodings in the System register encoding space:
MRS <Xt>, ELR_EL3
(op0 = 0b11, op1 = 0b110, CRn = 0b0100, CRm = 0b0000, op2 = 0b001)
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>
(op0 = 0b11, op1 = 0b110, CRn = 0b0100, CRm = 0b0000, op2 = 0b001)
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;
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