Merge branch 'post-04' into post-05

This is no longer required and was already removed from the post in commit 992b958414.

README.md

@@ -1,10 +1,10 @@
-# Blog OS (Testing)
+# Blog OS (CPU Exceptions)
 
-[![Build Status](https://github.com/phil-opp/blog_os/workflows/Code/badge.svg?branch=post-04)](https://github.com/phil-opp/blog_os/actions?query=workflow%3A%22Code%22+branch%3Apost-04)
+[![Build Status](https://github.com/phil-opp/blog_os/workflows/Code/badge.svg?branch=post-05)](https://github.com/phil-opp/blog_os/actions?query=workflow%3A%22Code%22+branch%3Apost-05)
 
-This repository contains the source code for the [Testing][post] post of the [Writing an OS in Rust](https://os.phil-opp.com) series.
+This repository contains the source code for the [CPU Exceptions][post] post of the [Writing an OS in Rust](https://os.phil-opp.com) series.
 
-[post]: https://os.phil-opp.com/testing/
+[post]: https://os.phil-opp.com/cpu-exceptions/
 
 **Check out the [master branch](https://github.com/phil-opp/blog_os) for more information.**
 

src/interrupts.rs

@@ -0,0 +1,25 @@
+use crate::println;
+use lazy_static::lazy_static;
+use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
+
+lazy_static! {
+    static ref IDT: InterruptDescriptorTable = {
+        let mut idt = InterruptDescriptorTable::new();
+        idt.breakpoint.set_handler_fn(breakpoint_handler);
+        idt
+    };
+}
+
+pub fn init_idt() {
+    IDT.load();
+}
+
+extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
+    println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
+}
+
+#[test_case]
+fn test_breakpoint_exception() {
+    // invoke a breakpoint exception
+    x86_64::instructions::interrupts::int3();
+}

src/lib.rs

@@ -1,14 +1,19 @@
 #![no_std]
 #![cfg_attr(test, no_main)]
 #![feature(custom_test_frameworks)]
+#![feature(abi_x86_interrupt)]
 #![test_runner(crate::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 
 use core::panic::PanicInfo;
 
+pub mod interrupts;
 pub mod serial;
 pub mod vga_buffer;
 
+pub fn init() {
+    interrupts::init_idt();
+}
 pub trait Testable {
     fn run(&self) -> ();
 }
@@ -59,6 +64,7 @@ pub fn exit_qemu(exit_code: QemuExitCode) {
 #[cfg(test)]
 #[unsafe(no_mangle)]
 pub extern "C" fn _start() -> ! {
+    init();
     test_main();
     loop {}
 }

src/main.rs

@@ -11,9 +11,15 @@ use core::panic::PanicInfo;
 pub extern "C" fn _start() -> ! {
     println!("Hello World{}", "!");
 
+    blog_os::init();
+
+    // invoke a breakpoint exception
+    x86_64::instructions::interrupts::int3();
+
     #[cfg(test)]
     test_main();
 
+    println!("It did not crash!");
     loop {}
 }