Used by software to read the values of the CLAIM tag bits, and to clear CLAIM tag bits to 0.
The architecture does not define any functionality for the CLAIM tag bits.
CLAIM tags are typically used for communication between the debugger and target software.
Used in conjunction with the DBGCLAIMSET_EL1 register.
AArch64 System register DBGCLAIMCLR_EL1 bits [63:0] are architecturally mapped to AArch64 System register DBGCLAIMSET_EL1[63:0].
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 AArch32 System register DBGCLAIMSET[31:0].
AArch64 System register DBGCLAIMCLR_EL1 bits [31:0] are architecturally mapped to External register DBGCLAIMCLR_EL1[31:0].
AArch64 System register DBGCLAIMCLR_EL1 bits [31:0] are architecturally mapped to External register DBGCLAIMSET_EL1[31:0].
This register is present only when FEAT_AA64 is implemented. Otherwise, direct accesses to DBGCLAIMCLR_EL1 are UNDEFINED.
An implementation must include eight CLAIM tag bits.
DBGCLAIMCLR_EL1 is a 64-bit register.
| 63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
| 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 |
| RES0 | |||||||||||||||||||||||||||||||
| RAZ/WI | CLAIM7 | CLAIM6 | CLAIM5 | CLAIM4 | CLAIM3 | CLAIM2 | CLAIM1 | CLAIM0 | |||||||||||||||||||||||
Reserved, RES0.
Reserved, RAZ/WI.
Claim Tag Clear. Indicates the current status of Claim Tag bit <m>, and is used to clear Claim Tag bit <m> to 0.
| CLAIM<m> | Meaning |
|---|---|
| 0b0 | On a read: Claim Tag bit <m> is not set. On a write: Ignored. |
| 0b1 | On a read: Claim Tag bit <m> is set. On a write: Clear Claim tag bit <m> to 0. |
The reset behavior of this field is:
Access to this field is W1C.
Accesses to this register use the following encodings in the System register encoding space:
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 0b000 | 0b0111 | 0b1001 | 0b110 |
if !IsFeatureImplemented(FEAT_AA64) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.DBGCLAIM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.<TDE,TDA> != '00' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = DBGCLAIMCLR_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = DBGCLAIMCLR_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = DBGCLAIMCLR_EL1;
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 0b000 | 0b0111 | 0b1001 | 0b110 |
if !IsFeatureImplemented(FEAT_AA64) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.DBGCLAIM == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.<TDE,TDA> != '00' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else DBGCLAIMCLR_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TDA == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TDA == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else DBGCLAIMCLR_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then DBGCLAIMCLR_EL1 = X[t, 64];