Exceptions

aarch64-rt provides a trait to define exception handlers, and a macro to generate the assembly code for the exception vector to call them.

The trait has default implementations for each method which simply panic, so we can omit methods for exceptions we don’t expect to happen.

use aarch64_rt::{ExceptionHandlers, RegisterStateRef, exception_handlers};
use log::error;
use smccc::Hvc;
use smccc::psci::system_off;

struct Handlers;

impl ExceptionHandlers for Handlers {
    extern "C" fn sync_current(_state: RegisterStateRef) {
        error!("sync_current");
        system_off::<Hvc>().unwrap();
    }

    extern "C" fn irq_current(_state: RegisterStateRef) {
        error!("irq_current");
        system_off::<Hvc>().unwrap();
    }

    extern "C" fn fiq_current(_state: RegisterStateRef) {
        error!("fiq_current");
        system_off::<Hvc>().unwrap();
    }

    extern "C" fn serror_current(_state: RegisterStateRef) {
        error!("serror_current");
        system_off::<Hvc>().unwrap();
    }
}

exception_handlers!(Handlers);