ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Debug Events
Debug events must be taken in the execution order of the sequential execution model. This means that if an
instruction causes a debug event then that event must be taken before any debug event on any instruction
that would execute after that instruction, in the sequential execution model. In particular, if the execution of
an instruction generates an asynchronous Watchpoint debug event:
the asynchronous Watchpoint debug event must not be taken if the instruction also generates any
synchronous debug event
if the instruction does not generate any synchronous debug event, then the asynchronous Watchpoint
debug event must be taken before any subsequent:
— synchronous or asynchronous debug event
— synchronous or asynchronous precise exception.
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