Add a print_error function, which works for exceptions inside println

src/interrupts/mod.rs

@@ -14,7 +14,9 @@ pub fn init() {
     IDT.load();
 }
 
+use vga_buffer::print_error;
+
 extern "C" fn page_fault_handler() -> ! {
-    println!("EXCEPTION: PAGE FAULT");
+    unsafe { print_error(format_args!("EXCEPTION: PAGE FAULT")) };
     loop {}
 }

src/lib.rs

@@ -49,8 +49,8 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) {
     // initialize our IDT
     interrupts::init();
 
-    // provoke a page fault by writing to some random address
-    unsafe{ *(0xdeadbeaf as *mut u64) = 42 };
+    // provoke a page fault inside println
+    println!("{:?}", unsafe{ *(0xdeadbeaf as *mut u64) = 42 });
 
     println!("It did not crash!");
     loop {}

src/vga_buffer.rs

@@ -38,6 +38,19 @@ pub fn clear_screen() {
     }
 }
 
+pub unsafe fn print_error(fmt: fmt::Arguments) {
+    use core::fmt::Write;
+
+    let mut writer = Writer {
+        column_position: 0,
+        color_code: ColorCode::new(Color::Red, Color::Black),
+        buffer: Unique::new(0xb8000 as *mut _),
+    };
+    writer.new_line();
+    writer.write_fmt(fmt);
+}
+
+
 #[allow(dead_code)]
 #[repr(u8)]
 pub enum Color {