Holds bits[63:0] of key A used for authentication of data pointer values.
The term APDAKey_EL1 is used to describe the concatenation of APDAKeyHi_EL1: APDAKeyLo_EL1.
This register is present only when FEAT_PAuth is implemented. Otherwise, direct accesses to APDAKeyLo_EL1 are UNDEFINED.
APDAKeyLo_EL1 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 |
| 64 bit value, bits[63:0] of the 128 bit pointer authentication key value | |||||||||||||||||||||||||||||||
| 64 bit value, bits[63:0] of the 128 bit pointer authentication key value | |||||||||||||||||||||||||||||||
64 bit value, bits[63:0] of the 128 bit pointer authentication key value.
The reset behavior of this field is:
Accesses to this register use the following encodings in the System register encoding space:
MRS <Xt>, APDAKeyLo_EL1
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b0010 | 0b0010 | 0b000 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.APK == '0' then UNDEFINED; elsif EL2Enabled() && HCR_EL2.APK == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGRTR_EL2.APDAKey == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.APK == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = APDAKeyLo_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.APK == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.APK == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = APDAKeyLo_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = APDAKeyLo_EL1;
MSR APDAKeyLo_EL1, <Xt>
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b0010 | 0b0010 | 0b000 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.APK == '0' then UNDEFINED; elsif EL2Enabled() && HCR_EL2.APK == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGWTR_EL2.APDAKey == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.APK == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else APDAKeyLo_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.APK == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.APK == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else APDAKeyLo_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then APDAKeyLo_EL1 = X[t, 64];