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ELR_EL3, Exception Link Register (EL3)

The ELR_EL3 characteristics are:

Purpose

When taking an exception to EL3, holds the address to return to.

Configuration

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

ELR_EL3 is a 64-bit register.

Field descriptions

The ELR_EL3 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
Return address
Return address
313029282726252423222120191817161514131211109876543210

Bits [63:0]

Return address.

An exception return from EL3 using AArch64 makes ELR_EL3 become UNKNOWN.

This field resets to an architecturally UNKNOWN value.

Accessing the ELR_EL3

Accesses to this register use the following encodings:

MRS <Xt>, ELR_EL3

op0op1CRnCRmop2
0b110b1100b01000b00000b001
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    return ELR_EL3;
              

MSR ELR_EL3, <Xt>

op0op1CRnCRmop2
0b110b1100b01000b00000b001
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    ELR_EL3 = X[t];
              


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