TRFCR Trace Filter Control Register when FEAT_AA32EL1 is implemented and FEAT_TRF is implemented TRFCR_EL1 Architectural AArch64 31 0 31 0 31 0 31 0 Provides EL1 controls for Trace. Debug TRFCR is a 32-bit register. 31 7 31:7 Reserved, RES0. TS 6 5 6:5 Timestamp Control. Controls which timebase is used for trace timestamps. All other values are reserved. This field is ignored by the PE when any of the following are true: EL2 is implemented and HTRFCR.TS != 0b00. SelfHostedTraceEnabled() == FALSE. 0b01 Virtual timestamp. The traced timestamp is the physical counter value minus the value of CNTVOFF. 0b10 Guest physical timestamp. The traced timestamp is the physical counter value minus a physical offset. If any of the following are true, the physical offset is zero, otherwise the physical offset is the value of CNTPOFF_EL2: EL3 is implemented and is using AArch32. EL3 is implemented, using AArch64, and SCR_EL3.ECVEn is 0. EL2 is using AArch32. EL2 is using AArch64 and CNTHCTL_EL2.ECV is 0. FEAT_ECV_POFF is not implemented. When FEAT_ECV is implemented 0b11 Physical timestamp. The traced timestamp is the physical counter value. AU 4 2 4:2 Reserved, RES0. E1TRE 1 1 1 EL1 Trace Enable. This field is ignored if SelfHostedTraceEnabled() == FALSE. 0b0 Tracing is prohibited in PL1 modes. 0b1 Tracing is allowed in PL1 modes. '0' E0TRE 0 0 0 EL0 Trace Enable. This field is ignored if any of the following are true: SelfHostedTraceEnabled() == FALSE. EL2 is implemented and enabled in the current security state and HCR.TGE == 1. 0b0 Tracing is prohibited at EL0. 0b1 Tracing is allowed at EL0. '0' MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !(IsFeatureImplemented(FEAT_AA32EL1) && IsFeatureImplemented(FEAT_TRF)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && PSTATE.M != M32_Monitor && SDCR().TTRF == '1' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2().T1 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR().T1 == '1' then AArch32_TakeHypTrapException(0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && MDCR_EL2().TTRF == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HDCR().TTRF == '1' then AArch32_TakeHypTrapException(0x03); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x03); end; elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && PSTATE.M != M32_Monitor && SDCR().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch32_TakeMonitorTrapException(); end; else R(t) = TRFCR(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && SDCR().TTRF == '1' then Undefined(); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x03); end; elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && SDCR().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch32_TakeMonitorTrapException(); end; else R(t) = TRFCR(); end; elsif PSTATE.EL == EL3 then if PSTATE.M != M32_Monitor && SDCR().TTRF == '1' then AArch32_TakeMonitorTrapException(); else R(t) = TRFCR(); end; end; MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !(IsFeatureImplemented(FEAT_AA32EL1) && IsFeatureImplemented(FEAT_TRF)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && PSTATE.M != M32_Monitor && SDCR().TTRF == '1' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2().T1 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR().T1 == '1' then AArch32_TakeHypTrapException(0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && MDCR_EL2().TTRF == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HDCR().TTRF == '1' then AArch32_TakeHypTrapException(0x03); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x03); end; elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && PSTATE.M != M32_Monitor && SDCR().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch32_TakeMonitorTrapException(); end; else TRFCR() = R(t); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && SDCR().TTRF == '1' then Undefined(); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA64EL3) && !ELUsingAArch32(EL3) && MDCR_EL3().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch64_AArch32SystemAccessTrap(EL3, 0x03); end; elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) && SDCR().TTRF == '1' then if EL3SDDUndef() then Undefined(); else AArch32_TakeMonitorTrapException(); end; else TRFCR() = R(t); end; elsif PSTATE.EL == EL3 then if PSTATE.M != M32_Monitor && SDCR().TTRF == '1' then AArch32_TakeMonitorTrapException(); else TRFCR() = R(t); end; end; 2026-03-26 20:27:25 2026-03_rel