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70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2020 Andre Richter <andre.o.richter@gmail.com>
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//! A panic handler that infinitely waits.
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use crate::{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 the "standard" (non-testing) `libkernel`.
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///
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/// This code will be used by the release kernel binary and the `integration tests`. It is linked
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/// weakly, so that the integration tests can overload it to exit `QEMU` instead of spinning
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/// forever.
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///
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/// This is one possible approach to solve the problem that `cargo` can not know who the consumer of
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/// the library will be:
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/// - The release kernel binary that should safely park the paniced core,
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/// - or an `integration test` that is executed in QEMU, which should just exit QEMU.
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#[cfg(not(test))]
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#[linkage = "weak"]
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#[no_mangle]
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fn _panic_exit() -> ! {
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cpu::wait_forever()
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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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#[panic_handler]
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fn panic(info: &PanicInfo) -> ! {
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unsafe { exception::asynchronous::local_irq_mask() };
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if let Some(args) = info.message() {
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panic_println!("\nKernel panic: {}", args);
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} else {
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panic_println!("\nKernel panic!");
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}
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_panic_exit()
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}
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//--------------------------------------------------------------------------------------------------
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// Testing
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//--------------------------------------------------------------------------------------------------
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/// The point of exit when the library is compiled for testing.
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#[cfg(test)]
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#[no_mangle]
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fn _panic_exit() -> ! {
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cpu::qemu_exit_failure()
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}
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