From aba82564f543f419fe33647f537218a0e40d4865 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Sun, 16 Apr 2023 00:04:49 +0300
Subject: [PATCH] Kernel: Panic wont print stacktrace if it has already paniced

This prevents stack trace dump to panic and loop
---
 kernel/CMakeLists.txt         |  1 +
 kernel/include/kernel/Panic.h | 25 ++++++++++++++-----------
 kernel/kernel/Panic.cpp       |  6 ++++++
 3 files changed, 21 insertions(+), 11 deletions(-)
 create mode 100644 kernel/kernel/Panic.cpp

diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index 9c88bc1d6..7e25c039e 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -27,6 +27,7 @@ set(KERNEL_SOURCES
 	kernel/kernel.cpp
 	kernel/Memory/Heap.cpp
 	kernel/Memory/kmalloc.cpp
+	kernel/Panic.cpp
 	kernel/PCI.cpp
 	kernel/PIC.cpp
 	kernel/PIT.cpp
diff --git a/kernel/include/kernel/Panic.h b/kernel/include/kernel/Panic.h
index 75e15b8d8..74d82ecae 100644
--- a/kernel/include/kernel/Panic.h
+++ b/kernel/include/kernel/Panic.h
@@ -4,23 +4,26 @@
 
 #define panic(...) detail::panic_impl(__FILE__, __LINE__, __VA_ARGS__)
 
-namespace Kernel
+namespace Kernel::detail
 {
 
-	namespace detail
+	extern bool g_paniced;
+
+	template<typename... Args>
+	__attribute__((__noreturn__))
+	static void panic_impl(const char* file, int line, const char* message, Args... args)
 	{
-		template<typename... Args>
-		__attribute__((__noreturn__))
-		static void panic_impl(const char* file, int line, const char* message, Args... args)
+		asm volatile("cli");
+		derrorln("Kernel panic at {}:{}", file, line);
+		derrorln(message, args...);
+		if (!g_paniced)
 		{
-			asm volatile("cli");
-			derrorln("Kernel panic at {}:{}", file, line);
-			derrorln(message, args...);
+			g_paniced = true;
 			Debug::dump_stack_trace();
-			for (;;)
-				asm volatile("hlt");
-			__builtin_unreachable();
 		}
+		for (;;)
+			asm volatile("hlt");
+		__builtin_unreachable();
 	}
 
 }
\ No newline at end of file
diff --git a/kernel/kernel/Panic.cpp b/kernel/kernel/Panic.cpp
new file mode 100644
index 000000000..1c0ad8a7a
--- /dev/null
+++ b/kernel/kernel/Panic.cpp
@@ -0,0 +1,6 @@
+#include <kernel/Panic.h>
+
+namespace Kernel::detail
+{
+	bool g_paniced = false;
+}