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Exception vector table and framework for handling syscalls

Sophia Theresa Pietsch requested to merge exception-untested into main
  • added exception vector table for exceptions ending in EL1
  • if coming from lower EL and Arch64, calls an exception handler
  • otherwise calls a dummy handler with an index indicating which dummy handler was called

Note: context switching back to kernel is not fully implemented. Task information is not saved, so the task will start executing from the beginning after each time it is scheduled.

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