SWCU194 March 2023 CC1314R10 , CC1354P10 , CC1354R10 , CC2674P10 , CC2674R10
Descriptions of exception handling use the following terms.
Preemption: An exception can preempt the current execution if its priority is higher than the current execution priority. When one exception preempts another, the exceptions are called nested exceptions.
Return: This occurs when the exception handler is completed. The processor pops the stack and restores the processor state to the state it had before the interrupt occurred.
Tail-Chaining: This mechanism speeds up exception servicing. On completion of an exception handler or during the return operation, if there is a pending exception that meets the requirements for exception entry, then the stack pop is skipped and control transfers directly to the new exception handler.
Late Arriving Interrupts: This mechanism speeds up preemption. If a higher priority exception occurs during state saving for a previous exception, the processor switches to handle the higher priority exception and initiates the vector fetch for that exception. State saving may be affected by the late arrival depending on the stacking requirements of the original exception and the late-arriving exception. On return from the exception handler of the late-arriving exception, the normal tailchaining rules apply.