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Exception Return using the ELR and SPSR for the current Exception level. When executed, the PE restores PSTATE from the SPSR, and branches to the address held in the ELR.
The PE checks the SPSR for the current Exception level for an illegal return event. See Illegal return events from AArch64 state.
ERET is undefined at EL0.
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 |
1 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
A | M | Rn | op4 |
if PSTATE.EL == EL0 then UNDEFINED;then UNDEFINED;
boolean pac = (A == '1');
boolean use_key_a = (M == '0');
if !pac && op4 != '00000' then
UNDEFINED;
elsif pac && (!HavePACExt() || op4 != '11111') then
UNDEFINED;
if Rn != '11111' then
UNDEFINED;
AArch64.CheckForERetTrap(FALSE, TRUE);
(pac, use_key_a);
bits(64) target = ELR[];[];
if pac then
if use_key_a then
target =
AuthIA(ELR[], SP[]);
else
target = AuthIB(ELR[], SP[]);
AArch64.ExceptionReturn(target, SPSR[]);
Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4
; Build timestamp: 2019-06-26T22:3004
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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