From 297f8442b90f1b58245d5e5143344a3ee5144225 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Wed, 3 Aug 2016 15:59:28 +0200
Subject: [PATCH] Reset src to master to be able to follow step-by-step

---
 src/interrupts/mod.rs | 92 ++-----------------------------------------
 src/lib.rs            | 11 ------
 2 files changed, 3 insertions(+), 100 deletions(-)

diff --git a/src/interrupts/mod.rs b/src/interrupts/mod.rs
index 8b735e2e..07d19874 100644
--- a/src/interrupts/mod.rs
+++ b/src/interrupts/mod.rs
@@ -1,48 +1,10 @@
 mod idt;
 
-macro_rules! handler {
-    ($name: ident) => {{
-        #[naked]
-        extern "C" fn wrapper() -> ! {
-            unsafe {
-                asm!("mov rdi, rsp
-                      sub rsp, 8 // align the stack pointer
-                      call $0"
-                      :: "i"($name as extern "C" fn(*const ExceptionStackFrame) -> !)
-                      : "rdi" : "intel");
-                ::core::intrinsics::unreachable();
-            }
-        }
-        wrapper
-    }}
-}
-
-macro_rules! handler_with_error_code {
-    ($name: ident) => {{
-        #[naked]
-        extern "C" fn wrapper() -> ! {
-            unsafe {
-                asm!("pop rsi // pop error code into rsi
-                      mov rdi, rsp
-                      sub rsp, 8 // align the stack pointer
-                      call $0"
-                      :: "i"($name as extern "C" fn(*const ExceptionStackFrame, u64) -> !)
-                      : "rdi" : "intel");
-                ::core::intrinsics::unreachable();
-            }
-        }
-        wrapper
-    }}
-}
-
 lazy_static! {
     static ref IDT: idt::Idt = {
         let mut idt = idt::Idt::new();
 
-        idt.set_handler(0, handler!(divide_by_zero_handler));
-        idt.set_handler(6, handler!(invalid_opcode_handler));
-        idt.set_handler(8, double_fault_handler);
-        idt.set_handler(14, handler_with_error_code!(page_fault_handler));
+        idt.set_handler(0, divide_by_zero_handler);
 
         idt
     };
@@ -54,55 +16,7 @@ pub fn init() {
 
 use vga_buffer::print_error;
 
-extern "C" fn divide_by_zero_handler(stack_frame: *const ExceptionStackFrame) -> ! {
-    unsafe {
-        print_error(format_args!("EXCEPTION: DIVIDE BY ZERO\n{:#?}", *stack_frame));
-    }
+extern "C" fn divide_by_zero_handler() -> ! {
+    unsafe { print_error(format_args!("EXCEPTION: DIVIDE BY ZERO")) };
     loop {}
 }
-
-extern "C" fn invalid_opcode_handler(stack_frame: *const ExceptionStackFrame) -> ! {
-    unsafe {
-        print_error(format_args!("EXCEPTION: INVALID OPCODE at {:#x}\n{:#?}",
-                                 (*stack_frame).instruction_pointer,
-                                 *stack_frame));
-    }
-    loop {}
-}
-
-extern "C" fn page_fault_handler(stack_frame: *const ExceptionStackFrame, error_code: u64) -> ! {
-    use x86::controlregs;
-    unsafe {
-        print_error(format_args!("EXCEPTION: PAGE FAULT while accessing {:#x}\nerror code: \
-                                  {:?}\n{:#?}",
-                                 controlregs::cr2(),
-                                 PageFaultErrorCode::from_bits(error_code).unwrap(),
-                                 *stack_frame));
-    }
-    loop {}
-}
-
-extern "C" fn double_fault_handler() -> ! {
-    unsafe { print_error(format_args!("EXCEPTION: DOUBLE FAULT")) };
-    loop {}
-}
-
-#[derive(Debug)]
-#[repr(C)]
-struct ExceptionStackFrame {
-    instruction_pointer: u64,
-    code_segment: u64,
-    cpu_flags: u64,
-    stack_pointer: u64,
-    stack_segment: u64,
-}
-
-bitflags! {
-    flags PageFaultErrorCode: u64 {
-        const PROTECTION_VIOLATION = 1 << 0,
-        const CAUSED_BY_WRITE = 1 << 1,
-        const USER_MODE = 1 << 2,
-        const MALFORMED_TABLE = 1 << 3,
-        const INSTRUCTION_FETCH = 1 << 4,
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
index 70bd0c0b..7a35129e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,8 +11,6 @@
 #![feature(const_fn, unique)]
 #![feature(alloc, collections)]
 #![feature(asm)]
-#![feature(naked_functions)]
-#![feature(core_intrinsics)]
 #![no_std]
 
 extern crate rlibc;
@@ -49,22 +47,13 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) {
     // set up guard page and map the heap pages
     memory::init(boot_info);
 
-
     // initialize our IDT
     interrupts::init();
 
-    // provoke a page fault
-    unsafe { *(0xdeadbeaf as *mut u64) = 42 };
-
     fn divide_by_zero() {
         unsafe { asm!("mov dx, 0; div dx" ::: "ax", "dx" : "volatile", "intel") }
     }
 
-    println!("{:?}", divide_by_zero());
-
-    // provoke a page fault inside println
-    println!("{:?}", unsafe { *(0xdeadbeaf as *mut u64) = 42 });
-
     // provoke a divide by zero fault inside println
     println!("{:?}", divide_by_zero());