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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.

This register is present only when HaveEL(EL3 is implemented.). Otherwise, direct accesses to ELR_EL3 are UNDEFINED.

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];




1327/1209/2019 1518:1348; 391b5248b29fb2f001ef74792eaacbd6fc72f2116134483bd14dc8c12a99c984cbfe3431cc1c9707

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