Handle CPU exceptions

Cargo.lock

@@ -9,9 +9,22 @@ dependencies = [
  "bootloader",
  "lazy_static",
  "spin",
- "volatile",
+ "volatile 0.2.7",
+ "x86_64",
 ]
 
+[[package]]
+name = "bit_field"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcb6dd1c2376d2e096796e234a70e17e94cc2d5d54ff8ce42b28cef1d0d359a4"
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "bootloader"
 version = "0.9.19"
@@ -38,3 +51,20 @@ name = "volatile"
 version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f6b06ad3ed06fef1713569d547cdbdb439eafed76341820fb0e0344f29a41945"
+
+[[package]]
+name = "volatile"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4c2dbd44eb8b53973357e6e207e370f0c1059990df850aca1eca8947cf464f0"
+
+[[package]]
+name = "x86_64"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4522ae25e1e0dbf4302ffde77e55c43afe3d7523cba662943b5de8ff04871f6c"
+dependencies = [
+ "bit_field",
+ "bitflags",
+ "volatile 0.4.4",
+]

Cargo.toml

@@ -9,6 +9,7 @@ edition = "2018"
 bootloader = "0.9.8"
 volatile = "0.2.6"
 spin = "0.5.2"
+x86_64 = "0.14.2"
 
 [dependencies.lazy_static]
 version = "1.0"

src/interrupts.rs

@@ -0,0 +1,19 @@
+use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
+use crate::println;
+use lazy_static::lazy_static;
+
+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);
+}

src/main.rs

@@ -1,7 +1,14 @@
 #![no_std]
 #![no_main]
 
+#![feature(custom_test_frameworks)]
+#![test_runner(crate::test_runner)]
+#![reexport_test_harness_main = "test_main"]
+
+#![feature(abi_x86_interrupt)]
+
 mod vga_buffer;
+mod interrupts;
 use core::panic::PanicInfo;
 
 
@@ -11,12 +18,29 @@ fn panic(info: &PanicInfo) -> ! {
     loop {}
 }
 
+fn init() {
+    interrupts::init_idt();
+}
+
 #[no_mangle]
 pub extern "C" fn _start() {
-    println!("The senate will decide your fate");
-    println!();
-    panic!("I am the senate");
+    println!("Hello, world");
 
+    init();
 
+    x86_64::instructions::interrupts::int3();
+
+    #[cfg(test)]
+    test_main();
+
+    println!("It did not crash!");
     loop {}
 }
+
+#[cfg(test)]
+fn test_runner(tests: &[&dyn Fn()]) {
+    println!("Running {} tests", tests.len());
+    for test in tests {
+        test();
+    }
+}