all sections yay

main.rs

#![no_std]
#![no_main]

use core::panic::PanicInfo;
use module_rt::entry;

const MAX: usize = 8;
static mut X: [u32; MAX] = [
    1, 2, 3, 4,
    5, 6, 7, 8,
];

const EMPTY_ADDR: usize = 0x2001_0000;
const OTHER_ADDR: usize = 0x8000_1000;

const HW: &'static str = "Hello World";

#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    // TODO: hit a trap to machine mode
    loop {}
}

unsafe fn funky(i: usize) -> usize {
    i + (X[i] as usize)
}

#[entry]
fn main() -> ! {
    unsafe {
        for i in 0..MAX {
            let ptr = &mut X[i] as *mut u32;
            let src_addr = EMPTY_ADDR + funky(i);
            let val = core::ptr::read_volatile(src_addr as *const u32);
            core::ptr::write_volatile(ptr, val);
        }

        let src_addr = OTHER_ADDR;
        let val = core::ptr::read_volatile(src_addr as *const u32);

        let mut total = 0;
        for i in 0..MAX {
            total += X[i] + val;
        }

        if HW.as_bytes()[total as usize] > 0 {
            panic!("{}", "WOOT");
        }

        if total > 100 {
            panic!("{}", "100");
        }
    }

    loop {
        continue
    }
}