From 250789aa209313ca517f4c0813941094d438d661 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Tue, 29 Aug 2023 00:13:21 +0300
Subject: [PATCH] Kernel: better handle kernel errors

---
 BAN/include/BAN/Errors.h  | 5 +++++
 kernel/kernel/Syscall.cpp | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/BAN/include/BAN/Errors.h b/BAN/include/BAN/Errors.h
index ac649a0b..bbfc5966 100644
--- a/BAN/include/BAN/Errors.h
+++ b/BAN/include/BAN/Errors.h
@@ -48,6 +48,11 @@ namespace BAN
 		{
 			return (Kernel::ErrorCode)(m_error_code & ~kernel_error_mask);
 		}
+
+		bool is_kernel_error() const
+		{
+			return m_error_code & kernel_error_mask;
+		}
 #endif
 
 		uint64_t get_error_code() const { return m_error_code; }
diff --git a/kernel/kernel/Syscall.cpp b/kernel/kernel/Syscall.cpp
index 0847fccb..fd9df89a 100644
--- a/kernel/kernel/Syscall.cpp
+++ b/kernel/kernel/Syscall.cpp
@@ -186,6 +186,9 @@ namespace Kernel
 
 		asm volatile("cli");
 
+		if (ret.is_error() && ret.error().is_kernel_error())
+			Kernel::panic("Kernel error while returning to userspace {}", ret.error());
+
 		ASSERT(Kernel::Thread::current().state() == Kernel::Thread::State::Executing);
 		Thread::current().load_sse();