From dfa1cc48c93b73a182b0cbfcc22c0a24027cb534 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Mon, 2 Jan 2017 15:35:06 +0100
Subject: [PATCH] Add a double fault handler (and trigger it)

---
 src/interrupts/mod.rs | 6 ++++++
 src/lib.rs            | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/interrupts/mod.rs b/src/interrupts/mod.rs
index 6556236e..c0232760 100644
--- a/src/interrupts/mod.rs
+++ b/src/interrupts/mod.rs
@@ -93,6 +93,7 @@ lazy_static! {
         idt.set_handler(0, handler!(divide_by_zero_handler));
         idt.set_handler(3, handler!(breakpoint_handler));
         idt.set_handler(6, handler!(invalid_opcode_handler));
+        idt.set_handler(8, handler_with_error_code!(double_fault_handler));
         idt.set_handler(14, handler_with_error_code!(page_fault_handler));
 
         idt
@@ -150,3 +151,8 @@ extern "C" fn page_fault_handler(stack_frame: &ExceptionStackFrame, error_code:
              stack_frame);
     loop {}
 }
+
+extern "C" fn double_fault_handler(stack_frame: &ExceptionStackFrame, _error_code: u64) {
+    println!("\nEXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
+    loop {}
+}
diff --git a/src/lib.rs b/src/lib.rs
index 441b2e5f..6a8ca74f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -56,8 +56,8 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) {
     // initialize our IDT
     interrupts::init();
 
-    // trigger a breakpoint exception
-    unsafe { int!(3) };
+    // trigger a debug exception
+    unsafe { int!(1) };
 
     println!("It did not crash!");
     loop {}