Test our exception handler by invoking a breakpoint exception

Cargo.toml

@@ -15,3 +15,7 @@ bitflags = "0.7.0"
 x86_64 = "0.1.2"
 once = "0.3.3"
 linked_list_allocator = "0.4.2"
+
+[dependencies.lazy_static]
+version = "0.2.4"
+features = ["spin_no_std"]

README.md

@@ -1,7 +1,7 @@
-# Blog OS (Kernel Heap)
-[![Build Status](https://travis-ci.org/phil-opp/blog_os.svg?branch=post_8)](https://travis-ci.org/phil-opp/blog_os/branches)
+# Blog OS (Handling Exceptions)
+[![Build Status](https://travis-ci.org/phil-opp/blog_os.svg?branch=post_9)](https://travis-ci.org/phil-opp/blog_os/branches)
 
-This repository contains the source code for the [Kernel Heap](http://os.phil-opp.com/kernel-heap.html) post of the [Writing an OS in Rust](http://os.phil-opp.com) series.
+This repository contains the source code for the [Handling Exceptions](http://os.phil-opp.com/handling-exceptions.html) post of the [Writing an OS in Rust](http://os.phil-opp.com) series.
 
 **Check out the [master branch](https://github.com/phil-opp/blog_os) for more information.**
 

src/interrupts.rs

@@ -0,0 +1,19 @@
+use x86_64::structures::idt::{Idt, ExceptionStackFrame};
+
+lazy_static! {
+    static ref IDT: Idt = {
+        let mut idt = Idt::new();
+        idt.breakpoint.set_handler_fn(breakpoint_handler);
+        idt
+    };
+}
+
+pub fn init() {
+    IDT.load();
+}
+
+extern "x86-interrupt" fn breakpoint_handler(
+    stack_frame: &mut ExceptionStackFrame)
+{
+    println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
+}

src/lib.rs

@@ -5,6 +5,7 @@
 #![feature(unique)]
 #![feature(allocator_api)]
 #![feature(global_allocator)]
+#![feature(abi_x86_interrupt)]
 #![no_std]
 
 
@@ -21,10 +22,12 @@ extern crate x86_64;
 #[macro_use]
 extern crate once;
 extern crate linked_list_allocator;
-
+#[macro_use]
+extern crate lazy_static;
 #[macro_use]
 mod vga_buffer;
 mod memory;
+mod interrupts;
 
 #[no_mangle]
 pub extern "C" fn rust_main(multiboot_information_address: usize) {
@@ -45,12 +48,17 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) {
         HEAP_ALLOCATOR.lock().init(HEAP_START, HEAP_START + HEAP_SIZE);
     }
 
+    // initialize our IDT
+    interrupts::init();
+
     for i in 0..10000 {
         format!("Some String");
     }
 
-    println!("It did not crash!");
+    // invoke a breakpoint exception
+    x86_64::instructions::interrupts::int3();
 
+    println!("It did not crash!");
     loop {}
 }