Why does AIX on Power require that the svc instruction must be preceded by an unconditional branch or a CR instruction?
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The [IBM AIX Documentation](https://www.ibm.com/docs/en/aix/7.3?topic=set-svc-supervisor-call-instruction) for the
svc (Supervisor Call) instruction has a note that states
> To ensure correct operation, an svc instruction must be preceded by an unconditional branch or a CR instruction.
Why is this required?
Asked by gorignak
(1 rep)
Aug 20, 2023, 04:24 AM