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//! # Panic module
//!
//! A panic handler that infinitely waits
use crate::{cpu,println};
use core::panic::PanicInfo;
/// # Prevent Double Faulting
///
/// An atomic operation is used to mark that
/// a fault has occurred. If it detects that
/// there was already a fault, it spins to
/// prevent a recursive faulting cycle.
fn panic_prevent_reenter() {
use core::sync::atomic::{AtomicBool, Ordering};
static PANIC_IN_PROGRESS: AtomicBool = AtomicBool::new(false);
if !PANIC_IN_PROGRESS.load(Ordering::Relaxed) {
PANIC_IN_PROGRESS.store(true, Ordering::Relaxed);
return;
}
cpu::wait_forever()
}
/// # Panic handler
#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
panic_prevent_reenter();
let (location, line, column) = match info.location() {
Some(loc) => (loc.file(), loc.line(), loc.column()),
_ => ("???",0,0),
};
println!("Kernel panic!\n\nPanic Location:\n\tFile: '{}', line {}, column {}\n\n{}", location, line, column, info.message().unwrap_or(&format_args!("")),);
cpu::wait_forever()
}
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