The function is a common API used to initialize exception handlers across all supported arm processors.
For Arm Cortex-A53, Cortex-R5, and Cortex-A9, the exception handlers are being initialized statically and this function does not do anything. However, it is still present to take care of backward compatibility issues (in earlier versions of BSPs, this API was being used to initialize exception handlers).
Prototype
void Xil_ExceptionInit(void);