Add a simple handler function for the breakpoint exception

src/interrupts.rs

@@ -1,5 +1,12 @@
-use x86_64::structures::idt::Idt;
+use x86_64::structures::idt::{Idt, ExceptionStackFrame};
 
 pub fn init() {
     let mut idt = Idt::new();
+    idt.breakpoint.set_handler_fn(breakpoint_handler);
+}
+
+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]