18.2.17 Exceptions

In addition, two weak general exception handlers are provided that can be overridden by the application — one to handle exceptions when StatusBEV is 1 (_bootstrap_exception_handler), and one to handle exceptions when StatusBEV is 0 (_general_exception_handler). Both the weak Reset exception handler and the weak general exception handler provided with the start-up code causes a software Reset. The start-up code arranges for a jump to the bootstrap exception handler to be located at 0xBFC00380, and a jump to the general exception handler to be located at EBASE + 0x180.

Both handlers must be attributed with the nomips16 [for example, __attribute__ ((nomips16))], since the start-up code jumps to these functions.

When the BOOTISA configuration bit is set for exceptions to be in the microMIPS mode, both handlers must be attributed with the micromips attribute [for example, __attribute__((micromips))].