ARM1136JF-S™ and ARM1136J-S™ Technical Reference Manual 13.6.1. Software debug event

A software debug event is any of the following:

A watchpoint debug event. This occurs when:
- the DVA present in the data bus matches the watchpoint value
- all the conditions of the WCR match
- the watchpoint is enabled
- the linked Context ID-holding BRP (if any) is enabled and its value matches the context ID in CP15 c13.
A breakpoint debug event. This occurs when:
- an instruction was fetched and the IVA present in the instruction bus matched the breakpoint value
- at the same time the instruction was fetched, all the conditions of the BCR matched
- the breakpoint was enabled
- at the same time the instruction was fetched, the linked Context ID-holding BRP (if any) was enabled and its value matched the context ID in CP15 c13
- the instruction is now committed for execution.
A breakpoint debug event also occurs when:
- an instruction was fetched and the CP15 Context ID (register 13) matched the breakpoint value
- at the same time the instruction was fetched, all the conditions of the BCR matched
- the breakpoint was enabled
- the instruction is now committed for execution.
A software breakpoint debug event. This occurs when a BKPT instruction is committed for execution.
A vector catch debug event. This occurs when:
- The instruction at a vector location was fetched. This includes any kind of prefetches, not just the ones due to exception entry.
- At the same time the instruction was fetched, the corresponding bit of the VCR was set (vector catch enabled).
- The instruction is now committed for execution.

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