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Semihosting enables code running on a platform model to directly access the I/O facilities of a host computer. To use semihosting, you must have connected the model to a debugger, for example DS-5 Debugger.
The simulator handles semihosting by either:
in AArch32 execution state, depending on whether the processor is in the Arm® or Thumb® instruction set state.
HLTin AArch64 execution state.