#![no_std]
#![no_main]

extern crate userspace_rt;

use userspace::syscall;

#[unsafe(no_mangle)]
extern "C" fn main() {
    // Cap slot 0 = endpoint cap (granted by adapter at boot)
    let ep: usize = 0;

    // Receive a message, echo it back with word0 incremented
    let (w0, w1, w2, w3) = syscall::receive(ep);
    syscall::send(ep, w0.wrapping_add(1), w1, w2, w3);

    syscall::exit();
}