RX4000V4 Datasheet

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CHAPTER 9 SYSTEM CONFIGURATION MANAGEMENT

(7) Once the kernel has received notification of the activation of exception processing, the CPU exception

handlers enter a state in which they can be activated (service calls can be issued). After the state has shifted,

the kernel calls back the function 鈥淿user_exc_handle鈥?described by the user (function name fixed).

(8) After the exception source has been determined by 鈥淿user_exc_handle鈥? ivsta_exc is issued, activating a CPU

exception handler corresponding to source of the exception that occurred.

(9) The required exception processing is performed by the CPU exception handler.

(10) 鈥淿user_exc_handle鈥?is then terminated by C language return or equivalent processing. At this time, if an event

in generated in the exception processing that requires scheduling, the kernel activates the scheduler and

switches tasks.

(11) If scheduling is not required in (10) above, or if the task that caused the exception is re-dispatched after

scheduling, control returns to the point at which 鈥淿kernel_exc_handle鈥?was called.

(12) The registers saved in (5) are restored, via the eret instruction, to the point where the exception occurred.

Note that in cases when restoring the saved epc register to its indicated address inadvertently causes the

reoccurrence of an exception, the value of epc must be changed to an appropriate value.

User鈥檚 Manual U14833EJ2V0UM

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