The DBGCLAIMSET characteristics are:
Used by software to set the CLAIM tag bits to 1.
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 DBGCLAIMCLR register.
This register is part of the Debug registers functional group.
There is one instance of this register that is used in both Secure and Non-secure states.
AArch32 System register DBGCLAIMSET is architecturally mapped to AArch64 System register DBGCLAIMSET_EL1.
AArch32 System register DBGCLAIMSET is architecturally mapped to External register DBGCLAIMSET_EL1.
An implementation must include 8 CLAIM tag bits.
DBGCLAIMSET is a 32-bit register.
The DBGCLAIMSET bit assignments are:
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 |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | CLAIM |
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.
Set CLAIM tag bits. RAO.
Writing a 1 to one of these bits sets the corresponding CLAIM tag bit to 1. This is an indirect write to the CLAIM tag bits. A single write operation can set multiple CLAIM tag bits to 1.
Writing 0 to one of these bits has no effect.
A cold reset clears the CLAIM tag bits to 0.
This register can be read using MRC with the following syntax:
MRC <syntax>
This register can be written using MCR with the following syntax:
MCR <syntax>
This syntax uses the following encoding in the System instruction encoding space:
<syntax> | opc1 | opc2 | CRn | coproc | CRm |
---|---|---|---|---|---|
p14, 0, <Rt>, c7, c8, 6 | 000 | 110 | 0111 | 1110 | 1000 |
The register is accessible as follows:
Control | Accessibility | |||||
---|---|---|---|---|---|---|
E2H | TGE | NS | EL0 | EL1 | EL2 | EL3 |
x | x | 0 | - | RW | n/a | RW |
x | 0 | 1 | - | RW | RW | RW |
x | 1 | 1 | - | n/a | RW | RW |
This table applies to all instructions that can access this register.
For a description of the prioritization of any generated exceptions, see section G1.11.2 (Exception priority order) in the ARM® Architecture Reference Manual, ARMv8, for ARMv8-A architecture profile for exceptions taken to AArch32 state, and section D1.13.2 (Synchronous exception prioritization) for exceptions taken to AArch64 state. Subject to the prioritization rules, the following traps and enables are applicable when accessing this register.
When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 :
If MDCR_EL2.TDA==1, Non-secure accesses to this register from EL1 are trapped to EL2.
When EL2 is implemented and is using AArch32 and SCR_EL3.NS==1 :
If HDCR.TDA==1, Non-secure accesses to this register from EL1 are trapped to Hyp mode.
When EL3 is implemented and is using AArch64 :
If MDCR_EL3.TDA==1, accesses to this register from EL1 and EL2 are trapped to EL3.
28/09/2017 08:24
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