5.3 Processor Exceptions

Floating-Point Exception

The Floating-Point exception is used by the floating-point coprocessor. This exception is not maskable.

Processing

The common exception vector is used for this exception, and the FPE code in the Cause register is set.

The contents of the Floating-Point Control/Status register indicate the cause of this exception.

Floating-Point exception processing is shown in Figure 5-17.

Servicing

This exception is cleared by clearing the appropriate bit in the Floating-Point Control/Status register.

For an unimplemented instruction exception, the kernel should emulate the instruction; for other exceptions, the kernel should pass the exception to the user program that caused the exception.

Generated with CERN WebMaker