DFAR, Data Fault Address Register

The DFAR characteristics are:

Purpose

Holds the virtual address of the faulting address that caused a synchronous Data Abort exception.

Configuration

AArch32 System register DFAR bits [31:0] are architecturally mapped to AArch64 System register FAR_EL1[31:0] .

AArch32 System register DFAR bits [31:0] (S) are architecturally mapped to AArch32 System register HDFAR[31:0] when HaveEL(EL2), HaveEL(EL3) and HighestELUsingAArch32().

RW fields in this register reset to architecturally UNKNOWN values.

Attributes

DFAR is a 32-bit register.

Field descriptions

The DFAR bit assignments are:

313029282726252423222120191817161514131211109876543210
VA of faulting address of synchronous Data Abort exception

Bits [31:0]

VA of faulting address of synchronous Data Abort exception.

This field resets to an architecturally UNKNOWN value.

Accessing the DFAR

Accesses to this register use the following encodings:

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

coprocopc1CRnCRmopc2
0b11110b0000b01100b00000b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T6 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T6 == '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 DFAR_S; else return DFAR_NS; else return DFAR; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && ELUsingAArch32(EL3) then return DFAR_NS; else return DFAR; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then return DFAR_S; else return DFAR_NS;

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

coprocopc1CRnCRmopc2
0b11110b0000b01100b00000b000

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T6 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T6 == '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 DFAR_S = R[t]; else DFAR_NS = R[t]; else DFAR = R[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && ELUsingAArch32(EL3) then DFAR_NS = R[t]; else DFAR = R[t]; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then DFAR_S = R[t]; else DFAR_NS = R[t];




27/03/2019 21:59; e5e4db499bf9867a4b93324c4dbac985d3da9376

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