141 lines
4.5 KiB
C++
141 lines
4.5 KiB
C++
/*
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* Copyright (c) 2011, 2014, 2013, 2014, 2015, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* panic.cpp
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* Displays an error whenever something critical happens.
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*/
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#include <brand.h>
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#include <string.h>
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#include <sortix/kernel/interrupt.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/log.h>
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#include <sortix/kernel/panic.h>
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namespace Sortix {
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#if defined(PANIC_SHORT)
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const bool longpanic = false;
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#else
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const bool longpanic = true;
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#endif
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static bool panicing = false;
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static bool doublepanic = false;
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static bool logrecovering = false;
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void PanicInit()
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{
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// TODO: Some panics are soft the console rendering and core features are
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// perfectly online, they do not need too paranoid handling here,
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// while others (like a real kernel crash) is critical and this is
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// needed. Supply multiple kernel panicing interfaces and switch code
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// to using them instead.
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// This is a kernel emergency. We will need to disable preemption, such that
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// this is the only thread running. This means that we cannot acquire locks
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// and the data protected by them may be inconsistent.
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Interrupt::Disable();
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// Detect if we are really early and we don't even have a log yet.
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if ( !Log::device_callback )
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HaltKernel();
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// Detect whether a panic happened during the log recovery.
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if ( logrecovering )
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{
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// Oh no! We paniced during the log recovery that we will do momentarily
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// - this means that there probably isn't anything we can do but halt.
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HaltKernel();
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}
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logrecovering = true;
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// The kernel log normally uses locks internally and the console may be
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// rendered by a background thread. This means that we cannot use the normal
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// kernel log, but that we rather need to switch to the kernel emergency
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// log, which is able to cope with the potential inconsistencies.
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Log::device_callback = Log::emergency_device_callback;
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Log::device_width = Log::emergency_device_width;
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Log::device_height = Log::emergency_device_height;
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Log::device_get_cursor = Log::emergency_device_get_cursor;
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Log::device_sync = Log::emergency_device_sync;
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Log::device_pointer = Log::emergency_device_pointer;
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// Check whether the panic condition left the kernel log unharmed.
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if ( !Log::emergency_device_is_impaired(Log::emergency_device_pointer) )
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{
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// The kernel log device transitioned ideally to the emergency state.
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}
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// Attempt to repair inconsistent state of the emergency log device.
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else if ( Log::emergency_device_recoup(Log::emergency_device_pointer) )
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{
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// The kernel log was successfully repaired and is ready for use in the
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// current emergency state.
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}
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// It was not possible to repair the emergency device properly, so instead
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// we will need to perform a hard reset of the emergency device.
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else
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{
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Log::emergency_device_reset(Log::emergency_device_pointer);
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// The kernel log was successfully repaired and is ready for use in the
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// current emergency state.
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}
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// Handle the case where the panic code caused another system crash.
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if ( panicing )
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{
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Log::Print("Panic while panicing:\n");
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doublepanic = true;
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return;
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}
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panicing = true;
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// Render a notice that the system has crashed and forcefully shut down.
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if ( longpanic )
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{
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Log::Print("\e[m\e[31;40m\e[2J\e[H");
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Log::Center(BRAND_LOGO_PANIC);
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Log::Center("KERNEL PANIC");
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Log::Print("\n\nThe operating system encountered an unrecoverable "
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"error.\n\nTechnical information:\n");
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}
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else
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{
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Log::Print("\e[m\e[31m\e[0Jkernel: panic: ");
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}
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}
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extern "C" __attribute__((noreturn)) void Panic(const char* error)
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{
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PanicInit();
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Log::Print(error);
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HaltKernel();
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}
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extern "C" __attribute__((noreturn)) void PanicF(const char* format, ...)
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{
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PanicInit();
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va_list list;
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va_start(list, format);
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Log::PrintFV(format, list);
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va_end(list);
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HaltKernel();
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}
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} // namespace Sortix
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