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# ERRSELR_EL1, Error Record Select Register

The ERRSELR_EL1 characteristics are:

## Purpose

Selects an error record to be accessed through the Error Record System registers.

## Configuration

AArch64 System register ERRSELR_EL1 bits [31:0] are architecturally mapped to AArch32 System register ERRSELR[31:0].

This register is present only when FEAT_RAS is implemented. Otherwise, direct accesses to ERRSELR_EL1 are UNDEFINED.

If ERRIDR_EL1 indicates that zero error records are implemented, then it is IMPLEMENTATION DEFINED whether ERRSELR_EL1 is UNDEFINED or RES0.

## Attributes

ERRSELR_EL1 is a 64-bit register.

## Field descriptions

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
RES0
RES0 | SEL

#### Bits [63:16]

Reserved, RES0.

#### SEL, bits [15:0]

Selects the error record accessed through the ERX registers.

For example, if ERRSELR_EL1.SEL is 0x0004, then direct reads and writes of ERXSTATUS_EL1 access ERR4STATUS.

If ERRSELR_EL1.SEL is greater than or equal to ERRIDR_EL1.NUM, then all of the following apply:

- The value read back from ERRSELR_EL1.SEL is UNKNOWN.
- One of the following occurs:
  - An UNKNOWN error record is selected.
  - The ERX*_EL1 registers are RAZ/WI.
  - ERX*_EL1 register reads and writes are NOPs.
  - ERX*_EL1 register reads and writes are UNDEFINED.

The reset behavior of this field is:

- On a Warm reset, this field resets to an architecturally UNKNOWN value.

## Accessing ERRSELR_EL1

Accesses to this register use the following encodings in the System register encoding space:

#### MRS <Xt>, ERRSELR_EL1

op0 | op1 | CRn | CRm | op2
--- | --- | --- | --- | ---
0b11 | 0b000 | 0b0101 | 0b0011 | 0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.TERR == '1' then UNDEFINED; elsif EL2Enabled() && HCR_EL2.TERR == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGRTR_EL2.ERRSELR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.TERR == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = ERRSELR_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.TERR == '1' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.TERR == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = ERRSELR_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = ERRSELR_EL1;

#### MSR ERRSELR_EL1, <Xt>

op0 | op1 | CRn | CRm | op2
--- | --- | --- | --- | ---
0b11 | 0b000 | 0b0101 | 0b0011 | 0b001

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.TERR == '1' then UNDEFINED; elsif HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.TWERR == '1' then UNDEFINED; elsif EL2Enabled() && HCR_EL2.TERR == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGWTR_EL2.ERRSELR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.TERR == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && SCR_EL3.TWERR == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else ERRSELR_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.TERR == '1' then UNDEFINED; elsif HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.TWERR == '1' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.TERR == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif HaveEL(EL3) && SCR_EL3.TWERR == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else ERRSELR_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then ERRSELR_EL1 = X[t, 64];

AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6

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