From 6590a5acfee33bae3ca0431c8af09768248fe405 Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Fri, 15 Nov 2019 20:21:25 +0100
Subject: Rename interrupt and exception handlers

---
 kernel/src/interrupts/exception_handlers.rs | 95 +++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 kernel/src/interrupts/exception_handlers.rs

(limited to 'kernel/src/interrupts/exception_handlers.rs')

diff --git a/kernel/src/interrupts/exception_handlers.rs b/kernel/src/interrupts/exception_handlers.rs
new file mode 100644
index 0000000..a3ecf9d
--- /dev/null
+++ b/kernel/src/interrupts/exception_handlers.rs
@@ -0,0 +1,95 @@
+use super::Interrupts;
+use crate::io::qemu;
+use x86_64::structures::idt::{InterruptStackFrame, PageFaultErrorCode};
+
+macro_rules! exception_default {
+    ($stack_frame: expr) => {
+        format_args!(
+            "instruction addr: 0x{:08x}\nstack addr: 0x{:08x}\nflags: 0x{:x}",
+            $stack_frame.instruction_pointer.as_u64(),
+            $stack_frame.stack_pointer.as_u64(),
+            $stack_frame.cpu_flags,
+        )
+    };
+}
+
+static mut expected_fault: Interrupts = Interrupts::None;
+
+pub unsafe fn expect_fault(int: Interrupts) {
+    if expected_fault == Interrupts::None {
+        expected_fault = int;
+    }
+}
+
+fn get_expected_fault() -> Interrupts {
+    unsafe { expected_fault }
+}
+
+pub extern "x86-interrupt" fn breakpoint_handler(stack_frame: &mut InterruptStackFrame) {
+    match get_expected_fault() {
+        Interrupts::Breakpoint => qemu::exit_qemu(qemu::QemuExitCode::Success),
+        _ => panic!(
+            "BREAKPOINT exception thrown\n\n{}",
+            exception_default!(stack_frame)
+        ),
+    }
+}
+
+pub extern "x86-interrupt" fn general_protection_fault_handler(
+    stack_frame: &mut InterruptStackFrame,
+    error_code: u64,
+) {
+    match get_expected_fault() {
+        Interrupts::GeneralProtectionFault => qemu::exit_qemu(qemu::QemuExitCode::Success),
+        _ => panic!(
+            "GENERAL PROTECTION exception thrown\nerror code: {:x}\n{}",
+            error_code,
+            exception_default!(stack_frame)
+        ),
+    }
+}
+
+pub extern "x86-interrupt" fn page_fault_handler(
+    stack_frame: &mut InterruptStackFrame,
+    error_code: PageFaultErrorCode,
+) {
+    use x86_64::registers::control::Cr2;
+
+    match get_expected_fault() {
+        Interrupts::PageFault => qemu::exit_qemu(qemu::QemuExitCode::Success),
+        _ => panic!(
+            "PAGE FAULT while accessing address: 0x{:08x}\nerror code: {:?}(0x{:x})\n{}",
+            Cr2::read().as_u64(),
+            error_code,
+            error_code.bits(),
+            exception_default!(stack_frame)
+        ),
+    }
+}
+
+pub extern "x86-interrupt" fn segment_not_present_handler(
+    stack_frame: &mut InterruptStackFrame,
+    error_code: u64,
+) {
+    match get_expected_fault() {
+        Interrupts::NotPresent => qemu::exit_qemu(qemu::QemuExitCode::Success),
+        _ => panic!(
+            "SEGMENT NOT PRESENT exception\nerror code: 0x{:x}\n{}",
+            error_code,
+            exception_default!(stack_frame)
+        ),
+    }
+}
+
+pub extern "x86-interrupt" fn double_fault_handler(
+    stack_frame: &mut InterruptStackFrame,
+    _error_code: u64, // code is always zero
+) {
+    match get_expected_fault() {
+        Interrupts::DoubleFault => qemu::exit_qemu(qemu::QemuExitCode::Success),
+        _ => panic!(
+            "DOUBLE FAULT\nthis is a fatal exception\n{}",
+            exception_default!(stack_frame)
+        ),
+    }
+}
-- 
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