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Terminate the simulation on exit() from firmware #380

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Terminate the simulation on exit() from firmware #380

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Commits on Jun 6, 2020

  1. run_avr: gracefully quit on exit() from firmware 

    When the firmware calls exit() or returns from main(), it ends up
running _exit(), which disables interrupts and hangs the CPU in an
infinite, empty loop. run_avr now terminates the simulation if the
CPU-hanging instruction (rjmp .-2) is executed with interrupts disabled.
    @edgar-bonet
    edgar-bonet committed Jun 6, 2020
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