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TRCIDR12, ID Register 12

The TRCIDR12 characteristics are:

Purpose

Returns the tracing capabilities of the trace unit.

Configuration

AArch64 System register TRCIDR12 bits [31:0] are architecturally mapped to External register TRCIDR12[31:0] .

This register is present only when ETE is implemented. Otherwise, direct accesses to TRCIDR12 are UNDEFINED.

Attributes

TRCIDR12 is a 64-bit register.

Field descriptions

The TRCIDR12 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
NUMCONDKEY
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

NUMCONDKEY, bits [31:0]

When TRCIDR0.TRCCOND == 0b1:

Indicates the number of conditional instruction right-hand keys. Conditional instruction tracing is not implemented in ETE and this field is reserved for other trace architectures. Allocated in other trace architectures.


Otherwise:

Reserved, RES0.

Accessing the TRCIDR12

Accesses to this register use the following encodings:

MRS <Xt>, TRCIDR12

op0op1CRnCRmop2
0b100b0010b00000b01000b110
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if CPACR_EL1.TTA == '1' then
        AArch64.SystemAccessTrap(EL1, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && CPTR_EL2.TTA == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.TRCID == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return TRCIDR12;
elsif PSTATE.EL == EL2 then
    if CPTR_EL2.TTA == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return TRCIDR12;
elsif PSTATE.EL == EL3 then
    if CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return TRCIDR12;
              


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