Identifies the current Process Identifier and, when using the Short-descriptor translation table format, the Address Space Identifier.
The value of the whole of this register is called the Context ID and is used by:
The significance of this register is for debug and trace use only.
This register is banked between CONTEXTIDR and CONTEXTIDR_S and CONTEXTIDR_NS.
AArch32 System register CONTEXTIDR bits [31:0] are architecturally mapped to AArch64 System register CONTEXTIDR_EL1[31:0].
This register is present only when FEAT_AA32EL1 is implemented. Otherwise, direct accesses to CONTEXTIDR are UNDEFINED.
The register format depends on whether address translation is using the Long-descriptor or the Short-descriptor translation table format.
CONTEXTIDR is a 32-bit register.
This register has the following instances:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| PROCID | ASID | ||||||||||||||||||||||||||||||
Process Identifier. This field must be programmed with a unique value that identifies the current process.
The reset behavior of this field is:
Address Space Identifier. This field is programmed with the value of the current ASID.
The reset behavior of this field is:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| PROCID | |||||||||||||||||||||||||||||||
Process Identifier. This field must be programmed with a unique value that identifies the current process.
The reset behavior of this field is:
Accesses to this register use the following encodings in the System register encoding space:
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1101 | 0b0000 | 0b001 |
if !IsFeatureImplemented(FEAT_AA32EL1) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2.T13 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR.T13 == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HCR_EL2.TRVM == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HCR.TRVM == '1' then AArch32.TakeHypTrapException(0x03); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) then R[t] = CONTEXTIDR_NS; else R[t] = CONTEXTIDR; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) then R[t] = CONTEXTIDR_NS; else R[t] = CONTEXTIDR; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then R[t] = CONTEXTIDR_S; else R[t] = CONTEXTIDR_NS;
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1101 | 0b0000 | 0b001 |
if !IsFeatureImplemented(FEAT_AA32EL1) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2.T13 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR.T13 == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HCR_EL2.TVM == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HCR.TVM == '1' then AArch32.TakeHypTrapException(0x03); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) then CONTEXTIDR_NS = R[t]; else CONTEXTIDR = R[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && IsFeatureImplemented(FEAT_AA32EL3) && ELUsingAArch32(EL3) then CONTEXTIDR_NS = R[t]; else CONTEXTIDR = R[t]; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then CONTEXTIDR_S = R[t]; else CONTEXTIDR_NS = R[t];