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DBGCLAIMCLR_EL1, Debug Claim Tag Clear register

The DBGCLAIMCLR_EL1 characteristics are:

Purpose

Used by software to read the values of the CLAIM tag bits, and to clear these bits to 0.

The architecture does not define any functionality for the CLAIM tag bits.

Note

CLAIM tags are typically used for communication between the debugger and target software.

Used in conjunction with the DBGCLAIMSET_EL1 register.

Configuration

AArch64 System register DBGCLAIMCLR_EL1 bits [31:0] are architecturally mapped to AArch32 System register DBGCLAIMCLR[31:0] .

AArch64 System register DBGCLAIMCLR_EL1 bits [31:0] are architecturally mapped to External register DBGCLAIMCLR_EL1[31:0] .

An implementation must include 8 CLAIM tag bits.

This register is in the Cold reset domain. See the CLAIM field description for the effect of a Cold reset on the value returned by this register. This register is not affected by a Warm reset.

Attributes

DBGCLAIMCLR_EL1 is a 64-bit register.

Field descriptions

The DBGCLAIMCLR_EL1 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
00000000000000000000000000000000
000000000000000000000000CLAIM
313029282726252423222120191817161514131211109876543210

Bits [63:32]

Reserved, RES0.

Bits [31:8]

Reserved, RAZ/SBZ. Software can rely on these bits reading as zero, and must use a should-be-zero policy on writes. Implementations must ignore writes.

CLAIM, bits [7:0]

Read or clear CLAIM tag bits. Reading this field returns the current value of the CLAIM tag bits.

Writing a 1 to one of these bits clears the corresponding CLAIM tag bit to 0. This is an indirect write to the CLAIM tag bits. A single write operation can clear multiple CLAIM tag bits to 0.

Writing 0 to one of these bits has no effect.

On a Cold reset, this field resets to 0.

Accessing the DBGCLAIMCLR_EL1

Accesses to this register use the following encodings:

MRS <Xt>, DBGCLAIMCLR_EL1

op0CRnop1op2CRm
0b100b01110b0000b1100b1001
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return DBGCLAIMCLR_EL1;
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return DBGCLAIMCLR_EL1;
elsif PSTATE.EL == EL3 then
    return DBGCLAIMCLR_EL1;
              

MSR DBGCLAIMCLR_EL1, <Xt>

op0CRnop1op2CRm
0b100b01110b0000b1100b1001
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        DBGCLAIMCLR_EL1 = X[t];
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then
        AArch64.SystemAccessTrap(EL3, 0x18);
    else
        DBGCLAIMCLR_EL1 = X[t];
elsif PSTATE.EL == EL3 then
    DBGCLAIMCLR_EL1 = X[t];
              


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