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TRCPRGCTLR, Programming Control Register

The TRCPRGCTLR characteristics are:

Purpose

Enables the trace unit.

Configuration

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

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

Attributes

TRCPRGCTLR is a 64-bit register.

Field descriptions

The TRCPRGCTLR bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0
RES0EN
313029282726252423222120191817161514131211109876543210

Bits [63:1]

Reserved, RES0.

EN, bit [0]

Trace unit enable bit.

ENMeaning
0b0

The trace unit is disabled.

0b1

The trace unit is enabled.

On a Trace unit reset, this field resets to 0.

Accessing the TRCPRGCTLR

Must be programmed.

Accesses to this register use the following encodings:

MRS <Xt>, TRCPRGCTLR

op0op1CRnCRmop2
0b100b0010b00000b00010b000
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 HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return TRCPRGCTLR;
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 TRCPRGCTLR;
elsif PSTATE.EL == EL3 then
    if CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return TRCPRGCTLR;
              

MSR TRCPRGCTLR, <Xt>

op0op1CRnCRmop2
0b100b0010b00000b00010b000
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 HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        TRCPRGCTLR = X[t];
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
        TRCPRGCTLR = X[t];
elsif PSTATE.EL == EL3 then
    if CPTR_EL3.TTA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        TRCPRGCTLR = X[t];
              


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