Attribute Macro exception 

#[exception]

Attribute to declare an exception handler and setting up respective symbols for linking

The exception handlers must have the name nmi or general_exception to create an NMI or an General Exception handler, respectively. The handlers take two u32 arguments for the CP0 Cause and CP0 Status registers.

Example (General Exception)

#[exception]
fn general_exception(cp0_cause: u32, cp0_status: u32) {

    // ...
}

Example (NMI)

#[exception]
fn nmi(cp0_cause: u32, cp0_status: u32) {

    // ...
}