DBG is a hint instruction. It is optional whether
they are implemented or not. If it is not implemented, it behaves
NOP. The assembler produces a diagnostic message
if the instruction executes as
NOP on the target.
DBG executes as a
in ARMv6K and ARMv6T2.
Debug hint provides a hint to debug and related systems. See their documentation for what use (if any) they make of this instruction.