Kernel: Implement __panic() for the aarch64 Kernel

Now that dump_backtrace() works, we can actually print a helpful
backtrace when the Kernel panics.

Kernel/Arch/aarch64/Dummy.cpp

@@ -24,16 +24,6 @@ READONLY_AFTER_INIT Thread* g_finalizer;
 
 }
 
-// Panic
-namespace Kernel {
-
-void __panic(char const*, unsigned int, char const*)
-{
-    for (;;) { }
-}
-
-}
-
 // Random
 namespace Kernel {
 

Kernel/Arch/aarch64/Panic.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/Processor.h>
+#include <Kernel/KSyms.h>
+#include <Kernel/Panic.h>
+
+// FIXME: Merge the code in this file with Kernel/Panic.cpp once the proper abstractions are in place.
+
+namespace Kernel {
+
+void __panic(char const* file, unsigned int line, char const* function)
+{
+    critical_dmesgln("at {}:{} in {}", file, line, function);
+    dump_backtrace(PrintToScreen::Yes);
+
+    Processor::halt();
+}
+
+}

Kernel/CMakeLists.txt

@@ -418,6 +418,7 @@ else()
         Arch/aarch64/kprintf.cpp
         Arch/aarch64/MainIdRegister.cpp
         Arch/aarch64/PageDirectory.cpp
+        Arch/aarch64/Panic.cpp
         Arch/aarch64/SafeMem.cpp
         Arch/aarch64/ScopedCritical.cpp
         Arch/aarch64/SmapDisabler.cpp

Kernel/Panic.h

@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <AK/Format.h>
+
 namespace Kernel {
 
 [[noreturn]] void __panic(char const* file, unsigned int line, char const* function);