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ADFSR, Auxiliary Data Fault Status Register

The ADFSR characteristics are:

Purpose

Provides additional IMPLEMENTATION DEFINED fault status information for Data Abort exceptions taken to EL1 modes, and EL3 modes when EL3 is implemented and is using AArch32.

Configuration

AArch32 System register ADFSR bits [31:0] are architecturally mapped to AArch64 System register AFSR0_EL1[31:0] .

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

ADFSR is a 32-bit register.

Field descriptions

The ADFSR bit assignments are:

313029282726252423222120191817161514131211109876543210
IMPLEMENTATION DEFINED

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED.

This field resets to an architecturally UNKNOWN value.

Accessing the ADFSR

Accesses to this register use the following encodings:

MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coprocopc1CRnCRmopc2
0b11110b0000b01010b00010b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T5 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T5 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TRVM == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TRVM == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif HaveEL(EL3) && ELUsingAArch32(EL3) then
        if SCR.NS == '0' then
            return ADFSR_S;
        else
            return ADFSR_NS;
    else
        return ADFSR;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && ELUsingAArch32(EL3) then
        return ADFSR_NS;
    else
        return ADFSR;
elsif PSTATE.EL == EL3 then
    if SCR.NS == '0' then
        return ADFSR_S;
    else
        return ADFSR_NS;
              

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coprocopc1CRnCRmopc2
0b11110b0000b01010b00010b000
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T5 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T5 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TVM == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TVM == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif HaveEL(EL3) && ELUsingAArch32(EL3) then
        if SCR.NS == '0' then
            ADFSR_S = R[t];
        else
            ADFSR_NS = R[t];
    else
        ADFSR = R[t];
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && ELUsingAArch32(EL3) then
        ADFSR_NS = R[t];
    else
        ADFSR = R[t];
elsif PSTATE.EL == EL3 then
    if SCR.NS == '0' then
        ADFSR_S = R[t];
    else
        ADFSR_NS = R[t];
              


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