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107 lines
3.0 KiB
Rust
107 lines
3.0 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2022 Andre Richter <andre.o.richter@gmail.com>
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//! A panic handler that infinitely waits.
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use crate::{backtrace, bsp, cpu, exception};
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use core::{fmt, panic::PanicInfo};
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//--------------------------------------------------------------------------------------------------
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// Private Code
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//--------------------------------------------------------------------------------------------------
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fn _panic_print(args: fmt::Arguments) {
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use fmt::Write;
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unsafe { bsp::console::panic_console_out().write_fmt(args).unwrap() };
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}
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/// The point of exit for `libkernel`.
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///
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/// It is linked weakly, so that the integration tests can overload its standard behavior.
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#[linkage = "weak"]
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#[no_mangle]
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fn _panic_exit() -> ! {
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#[cfg(not(feature = "test_build"))]
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{
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cpu::wait_forever()
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}
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#[cfg(feature = "test_build")]
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{
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cpu::qemu_exit_failure()
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}
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}
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/// Prints with a newline - only use from the panic handler.
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///
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/// Carbon copy from <https://doc.rust-lang.org/src/std/macros.rs.html>
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#[macro_export]
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macro_rules! panic_println {
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($($arg:tt)*) => ({
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_panic_print(format_args_nl!($($arg)*));
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})
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}
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/// Stop immediately if called a second time.
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///
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/// # Note
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///
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/// Using atomics here relieves us from needing to use `unsafe` for the static variable.
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///
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/// On `AArch64`, which is the only implemented architecture at the time of writing this,
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/// [`AtomicBool::load`] and [`AtomicBool::store`] are lowered to ordinary load and store
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/// instructions. They are therefore safe to use even with MMU + caching deactivated.
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///
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/// [`AtomicBool::load`]: core::sync::atomic::AtomicBool::load
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/// [`AtomicBool::store`]: core::sync::atomic::AtomicBool::store
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fn panic_prevent_reenter() {
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use core::sync::atomic::{AtomicBool, Ordering};
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#[cfg(not(target_arch = "aarch64"))]
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compile_error!("Add the target_arch to above's check if the following code is safe to use");
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static PANIC_IN_PROGRESS: AtomicBool = AtomicBool::new(false);
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if !PANIC_IN_PROGRESS.load(Ordering::Relaxed) {
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PANIC_IN_PROGRESS.store(true, Ordering::Relaxed);
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return;
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}
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_panic_exit()
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}
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#[panic_handler]
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fn panic(info: &PanicInfo) -> ! {
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use crate::time::interface::TimeManager;
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unsafe { exception::asynchronous::local_irq_mask() };
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// Protect against panic infinite loops if any of the following code panics itself.
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panic_prevent_reenter();
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let timestamp = crate::time::time_manager().uptime();
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let (location, line, column) = match info.location() {
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Some(loc) => (loc.file(), loc.line(), loc.column()),
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_ => ("???", 0, 0),
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};
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panic_println!(
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"[ {:>3}.{:06}] Kernel panic!\n\n\
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Panic location:\n File '{}', line {}, column {}\n\n\
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{}\n\n\
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{}",
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timestamp.as_secs(),
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timestamp.subsec_micros(),
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location,
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line,
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column,
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info.message().unwrap_or(&format_args!("")),
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backtrace::Backtrace
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);
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_panic_exit()
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}
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