Function backtrace

os/src/lang_items.rs:24–37

()

}

unsafe fn backtrace() {
    let mut fp: usize;
    let stop = current_kstack_top();
    asm!("mv {}, s0", out(reg) fp);
    println!("---START BACKTRACE---");
    for i in 0..10 {
        if fp == stop {
            break;
        }
        println!("#{}:ra={:#x}", i, *((fp - 8) as *const usize));
        fp = *((fp - 16) as *const usize);
    }
    println!("---END   BACKTRACE---");
}