From 833642d405bf79e511c69bc51217c247aab70d7b Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Sun, 28 May 2023 20:53:10 +0300
Subject: [PATCH] Kernel: ISR will now crash userspace process instead of
 panicing kernel

---
 kernel/arch/x86_64/IDT.cpp     | 17 +++++++++++++++--
 kernel/include/kernel/Thread.h |  3 +++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/kernel/arch/x86_64/IDT.cpp b/kernel/arch/x86_64/IDT.cpp
index 9cb16de905..a1d451f21b 100644
--- a/kernel/arch/x86_64/IDT.cpp
+++ b/kernel/arch/x86_64/IDT.cpp
@@ -6,6 +6,8 @@
 #include <kernel/Process.h>
 #include <kernel/Scheduler.h>
 
+#include <unistd.h>
+
 #define REGISTER_ISR_HANDLER(i) register_interrupt_handler(i, isr ## i)
 #define REGISTER_IRQ_HANDLER(i) register_interrupt_handler(IRQ_VECTOR_BASE + i, irq ## i)
 
@@ -99,19 +101,30 @@ namespace IDT
 
 	extern "C" void cpp_isr_handler(uint64_t isr, uint64_t error, const Registers* regs)
 	{
-		Kernel::panic(
+		dwarnln(
 			"{} (error code: 0x{16H}), pid {}, tid {}\r\n"
 			"Register dump\r\n"
 			"rax=0x{16H}, rbx=0x{16H}, rcx=0x{16H}, rdx=0x{16H}\r\n"
 			"rsp=0x{16H}, rbp=0x{16H}, rdi=0x{16H}, rsi=0x{16H}\r\n"
 			"rip=0x{16H}, rflags=0x{16H}\r\n"
-			"cr0=0x{16H}, cr2=0x{16H}, cr3=0x{16H}, cr4=0x{16H}\r\n",
+			"cr0=0x{16H}, cr2=0x{16H}, cr3=0x{16H}, cr4=0x{16H}",
 			isr_exceptions[isr], error, Kernel::Process::current().pid(), Kernel::Thread::current().tid(),
 			regs->rax, regs->rbx, regs->rcx, regs->rdx,
 			regs->rsp, regs->rbp, regs->rdi, regs->rsi,
 			regs->rip, regs->rflags,
 			regs->cr0, regs->cr2, regs->cr3, regs->cr4
 		);
+
+		if (Kernel::Thread::current().is_userspace() && !Kernel::Thread::current().is_in_syscall())
+		{
+			auto message = BAN::String::formatted("{}, aborting\n", isr_exceptions[isr]);
+			(void)Kernel::Process::current().write(STDERR_FILENO, message.data(), message.size());
+			Kernel::Process::current().exit();
+		}
+		else
+		{
+			Kernel::panic("Unhandled exception");
+		}
 	}
 
 	extern "C" void cpp_irq_handler(uint64_t irq)
diff --git a/kernel/include/kernel/Thread.h b/kernel/include/kernel/Thread.h
index 7643ed3bee..40987f351b 100644
--- a/kernel/include/kernel/Thread.h
+++ b/kernel/include/kernel/Thread.h
@@ -58,6 +58,9 @@ namespace Kernel
 
 		void set_in_syscall(bool b) { m_in_syscall = b; }
 
+		bool is_userspace() const { return m_is_userspace; }
+		bool is_in_syscall() const { return m_in_syscall; }
+
 	private:
 		Thread(pid_t tid, Process*);
 		void on_exit();