From a93aa3a4263c904d905ab727f27961059de6a57e Mon Sep 17 00:00:00 2001
From: Drew Galbraith <dgalbraith33@gmail.com>
Date: Wed, 22 Nov 2023 12:06:37 -0800
Subject: [PATCH] [Zion] Add an invalid opcode handler.

---
 zion/interrupt/interrupt.cpp     | 7 +++++++
 zion/interrupt/interrupt_enter.s | 1 +
 2 files changed, 8 insertions(+)

diff --git a/zion/interrupt/interrupt.cpp b/zion/interrupt/interrupt.cpp
index 9022b89..2f0ade4 100644
--- a/zion/interrupt/interrupt.cpp
+++ b/zion/interrupt/interrupt.cpp
@@ -75,6 +75,12 @@ extern "C" void interrupt_divide_by_zero(InterruptFrame* frame) {
   panic("DIV0");
 }
 
+extern "C" void isr_invalid_opcode();
+extern "C" void interrupt_invalid_opcode(InterruptFrame* frame) {
+  dbgln("RIP: {x}", frame->rip);
+  panic("INVALID OPCODE");
+}
+
 extern "C" void isr_protection_fault();
 extern "C" void interrupt_protection_fault(InterruptFrame* frame) {
   dbgln("General Protection Fault");
@@ -183,6 +189,7 @@ extern "C" void interrupt_pci4(InterruptFrame*) {
 
 void InitIdt() {
   gIdt[0] = CreateDescriptor(isr_divide_by_zero);
+  gIdt[0x6] = CreateDescriptor(isr_invalid_opcode);
   gIdt[0xD] = CreateDescriptor(isr_protection_fault);
   gIdt[0xE] = CreateDescriptor(isr_page_fault);
   gIdt[0x13] = CreateDescriptor(isr_fpe_fault);
diff --git a/zion/interrupt/interrupt_enter.s b/zion/interrupt/interrupt_enter.s
index 9acbe64..0da6b16 100644
--- a/zion/interrupt/interrupt_enter.s
+++ b/zion/interrupt/interrupt_enter.s
@@ -56,6 +56,7 @@ isr_\name:
 .endm
 
 isr_handler divide_by_zero
+isr_handler invalid_opcode
 isr_handler protection_fault,1
 isr_handler page_fault,1
 isr_handler fpe_fault