APDBKeyHi_EL1, Pointer Authentication Key B for Data (bits[127:64])

The APDBKeyHi_EL1 characteristics are:

Purpose

Holds bits[127:64] of key B used for authentication of data pointer values.

Note

The term APDBKey_EL1 is used to describe the concatenation of APDBKeyHi_EL1: APDBKeyLo_EL1.

Configuration

This register is present only when ARMv8.3-PAuth is implemented. Otherwise, direct accesses to APDBKeyHi_EL1 are UNDEFINED.

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

APDBKeyHi_EL1 is a 64-bit register.

Field descriptions

The APDBKeyHi_EL1 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
64 bit value, bits[127:64] of the 128 bit pointer authentication key value
64 bit value, bits[127:64] of the 128 bit pointer authentication key value
313029282726252423222120191817161514131211109876543210

Bits [63:0]

64 bit value, bits[127:64] of the 128 bit pointer authentication key value.

This field resets to an architecturally UNKNOWN value.

Accessing the APDBKeyHi_EL1

Accesses to this register use the following encodings:

MRS <Xt>, APDBKeyHi_EL1

CRnop0op1op2CRm
0b00100b110b0000b0110b0010

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.APK == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.APK == '0' then AArch64.SystemAccessTrap(EL3, 0x18); else return APDBKeyHi_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.APK == '0' then AArch64.SystemAccessTrap(EL3, 0x18); else return APDBKeyHi_EL1; elsif PSTATE.EL == EL3 then return APDBKeyHi_EL1;

MSR APDBKeyHi_EL1, <Xt>

CRnop0op1op2CRm
0b00100b110b0000b0110b0010

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.APK == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.APK == '0' then AArch64.SystemAccessTrap(EL3, 0x18); else APDBKeyHi_EL1 = X[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.APK == '0' then AArch64.SystemAccessTrap(EL3, 0x18); else APDBKeyHi_EL1 = X[t]; elsif PSTATE.EL == EL3 then APDBKeyHi_EL1 = X[t];




13/12/2018 16:42; 6379d01c197f1d40720d32d0f84c419c9187c009

Copyright © 2010-2018 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.