Function trap_handler

src/trap.rs:33–57

(cx: &mut TrapContext)

#[no_mangle]
extern "C" fn trap_handler(cx: &mut TrapContext) -> &mut TrapContext {
    let scause = scause::read();
    let stval = stval::read();
    match scause.cause() {
        Trap::Exception(Exception::UserEnvCall) => {
            cx.spec += 4;
            cx.x[10] = 0;
        },
        Trap::Exception(Exception::StoreFault) |
        Trap::Exception(Exception::StorePageFault) => {
            error!("{:?} va = {:#x} instruction = {:#x}", scause.cause(), stval::read(), sepc::read());
            panic!("page fault!");
        },
        Trap::Exception(Exception::IllegalInstruction) => {
            error!("IllegalInstruction");
        },
        Trap::Interrupt(Interrupt::SupervisorTimer) => {
            timer_next_triger();
        }
        _ => {
            panic!("Unhandled trap: {:?} stval = {:#x}", scause.cause(), stval);
        }
    }
    cx
}