TRCITECR_EL1 Instrumentation Trace Control Register (EL1) when FEAT_ITE is implemented, System register access to the trace unit registers is implemented, and FEAT_AA64 is implemented Provides EL1 controls for Trace Instrumentation. Trace TRCITECR_EL1 is a 64-bit register. 63 2 63:2 Reserved, RES0. E1E 1 1 1 EL1 Instrumentation Trace Enable. 0b0 Instrumentation trace prohibited at EL1. 0b1 Instrumentation trace not prohibited at EL1. '0' E0E 0 0 0 EL0 Instrumentation Trace Enable. This field is ignored by the PE when EL2 is implemented and enabled in the current Security state and the Effective value of HCR_EL2.TGE is 1. 0b0 Instrumentation trace prohibited at EL0. 0b1 Instrumentation trace not prohibited at EL0. '0' When the Effective value of HCR_EL2.E2H is 1, without explicit synchronization, accesses from EL3 using the accessor name TRCITECR_EL1 or TRCITECR_EL12 are not guaranteed to be ordered with respect to accesses using the other accessor name. MRS <Xt>, TRCITECR_EL1 if !(IsFeatureImplemented(FEAT_ITE) && IsFeatureImplemented(FEAT_TRC_SR) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnITE == '0' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT2) && ((HaveEL(EL3) && SCR_EL3().FGTEn2 == '0') || HDFGRTR2_EL2().nTRCITECR_EL1 == '0') then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().EnITE == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif EffectiveHCR_EL2_NVx() IN {'111'} then X{64}(t) = NVMem(0x888); else X{64}(t) = TRCITECR_EL1(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnITE == '0' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().EnITE == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif ELIsInHost(EL2) then X{64}(t) = TRCITECR_EL2(); else X{64}(t) = TRCITECR_EL1(); end; elsif PSTATE.EL == EL3 then X{64}(t) = TRCITECR_EL1(); end; MSR TRCITECR_EL1, <Xt> if !(IsFeatureImplemented(FEAT_ITE) && IsFeatureImplemented(FEAT_TRC_SR) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnITE == '0' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT2) && ((HaveEL(EL3) && SCR_EL3().FGTEn2 == '0') || HDFGWTR2_EL2().nTRCITECR_EL1 == '0') then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().EnITE == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif EffectiveHCR_EL2_NVx() IN {'111'} then NVMem(0x888) = X{64}(t); else TRCITECR_EL1() = X{64}(t); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnITE == '0' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().EnITE == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif ELIsInHost(EL2) then TRCITECR_EL2() = X{64}(t); else TRCITECR_EL1() = X{64}(t); end; elsif PSTATE.EL == EL3 then TRCITECR_EL1() = X{64}(t); end; MRS <Xt>, TRCITECR_EL12 When FEAT_VHE is implemented if !(IsFeatureImplemented(FEAT_ITE) && IsFeatureImplemented(FEAT_TRC_SR) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() == '101' then X{64}(t) = NVMem(0x888); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if ELIsInHost(EL2) then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnITE == '0' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().EnITE == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = TRCITECR_EL1(); end; else Undefined(); end; elsif PSTATE.EL == EL3 then if ELIsInHost(EL2) then X{64}(t) = TRCITECR_EL1(); else Undefined(); end; end; MSR TRCITECR_EL12, <Xt> When FEAT_VHE is implemented if !(IsFeatureImplemented(FEAT_ITE) && IsFeatureImplemented(FEAT_TRC_SR) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() == '101' then NVMem(0x888) = X{64}(t); elsif EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64_SystemAccessTrap(EL2, 0x18); else Undefined(); end; elsif PSTATE.EL == EL2 then if ELIsInHost(EL2) then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnITE == '0' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().EnITE == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else TRCITECR_EL1() = X{64}(t); end; else Undefined(); end; elsif PSTATE.EL == EL3 then if ELIsInHost(EL2) then TRCITECR_EL1() = X{64}(t); else Undefined(); end; end; 2026-03-26 20:27:25 2026-03_rel