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ERXSTATUS_EL1, Selected Error Record Primary Status Register

The ERXSTATUS_EL1 characteristics are:

Purpose

Accesses ERR<n>STATUS for the error record selected by ERRSELR_EL1.SEL.

Configuration

AArch64 System register ERXSTATUS_EL1 bits [31:0] are architecturally mapped to AArch32 System register ERXSTATUS[31:0] .

This register is present only when RAS is implemented. Otherwise, direct accesses to ERXSTATUS_EL1 are UNDEFINED.

Attributes

ERXSTATUS_EL1 is a 64-bit register.

Field descriptions

The ERXSTATUS_EL1 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
ERR<n>STATUS
ERR<n>STATUS
313029282726252423222120191817161514131211109876543210

Bits [63:0]

ERXSTATUS_EL1 accesses ERR<n>STATUS, where n is the value in ERRSELR_EL1.SEL.

Accessing the ERXSTATUS_EL1

If ERRIDR_EL1.NUM == 0 or ERRSELR_EL1.SEL is set to a value greater than or equal to ERRIDR_EL1.NUM, then one of the following occurs:

  • An UNKNOWN record is selected.

  • ERXSTATUS_EL1 is RAZ/WI.

  • Direct reads and writes of ERXSTATUS_EL1 are NOPs.

  • Direct reads and writes of ERXSTATUS_EL1 are UNDEFINED.

Accesses to this register use the following encodings:

MRS <Xt>, ERXSTATUS_EL1

op0op1CRnCRmop2
0b110b0000b01010b01000b010
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TERR == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.TERR == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return ERXSTATUS_EL1;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.TERR == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return ERXSTATUS_EL1;
elsif PSTATE.EL == EL3 then
    return ERXSTATUS_EL1;
              

MSR ERXSTATUS_EL1, <Xt>

op0op1CRnCRmop2
0b110b0000b01010b01000b010
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TERR == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.TERR == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        ERXSTATUS_EL1 = X[t];
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && SCR_EL3.TERR == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        ERXSTATUS_EL1 = X[t];
elsif PSTATE.EL == EL3 then
    ERXSTATUS_EL1 = X[t];
              


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