Fix interrupts

src/kernel/arch/x86_64/interrupts.rs

@@ -3,31 +3,42 @@
 
 use lazy_static::lazy_static;
 use x86_64::structures::idt::*;
+use crate::format;
 
 lazy_static! {
     pub static ref IDT: InterruptDescriptorTable = {
-        InterruptDescriptorTable::new()
+        let mut idt = InterruptDescriptorTable::new();
         // TODO: Re-implement this once the x86-interrupt ABI is fixed.
         // Alternatively: Write our own interrupt handler wrappers.
+        idt.double_fault.set_handler_fn(double_fault);
+        idt.page_fault.set_handler_fn(page_fault);
+        idt
     };
 }
 
-// For all these handlers, they will be called from a purely naked ASM
-// function. That function will first push all registers to the stack.
-// It is the responsibility of these functions to recover this info.
+extern "x86-interrupt" fn double_fault(info: InterruptStackFrame, _: u64) -> ! {
+    crate::interrupt::double_fault(format!("{info:#?}"));
+}
 
-// Recoverable exception: Occurs on division failure.
-#[unsafe(no_mangle)]
-pub extern "C" fn x86_divide_error() {}
-
-// Recoverable exception: Occurs on failure in BOUND instruction.
-#[unsafe(no_mangle)]
-pub extern "C" fn x86_bound_range() {}
-
-// Recoverable exception: Invalid opcode.
-#[unsafe(no_mangle)]
-pub extern "C" fn x86_invalid_opcode() {}
-
-// Recoverable exception: FPU not available or enabled.
-#[unsafe(no_mangle)]
-pub extern "C" fn x86_device_unavailable() {}
+#[allow(dead_code)]
+extern "x86-interrupt" fn page_fault(info: InterruptStackFrame, errcode: PageFaultErrorCode) {
+    if errcode.contains(PageFaultErrorCode::USER_MODE) {
+        // Fault occurred in usermode. Non fatal.
+        todo!()
+    } else {
+        // Fault occurred in kernel mode. This is possibly fatal.
+        // This is recoverable if we simply hit an unavailable page,
+        // but unrecoverable if we hit a nonexistent or invalid page.
+        if errcode.contains(PageFaultErrorCode::PROTECTION_VIOLATION)
+            | errcode.contains(PageFaultErrorCode::MALFORMED_TABLE)
+        {
+            let addr = unsafe {
+                let a: usize;
+                core::arch::asm! {"mov {}, cr2", out(reg) a};
+                a
+            };
+            let info_formatted = format!("{info:#?}");
+            crate::interrupt::page_fault(addr, info_formatted)
+        }
+    }
+} 

src/kernel/interrupt/mod.rs

@@ -1,16 +1,12 @@
 // Copyright (c) 2025 shibedrill
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-use core::str;
+use crate::memory::alloc::string::String;
 
-#[unsafe(no_mangle)]
-extern "C" fn double_fault(info: *const u8, info_len: usize) -> ! {
-    let info_slice = unsafe { &str::from_raw_parts(info, info_len) };
-    panic!("Double fault: {}", info_slice);
+pub fn double_fault(info: String) -> ! {
+    panic!("Double fault: {}", info);
 }
 
-#[unsafe(no_mangle)]
-pub extern "C" fn page_fault(addr: usize, info: *const u8, info_len: usize) -> ! {
-    let info_slice = unsafe { &str::from_raw_parts(info, info_len) };
-    panic!("Page fault at 0x{:X}: {}", addr, info_slice);
+pub fn page_fault(addr: usize, info: String) -> ! {
+    panic!("Page fault at 0x{:X}: {}", addr, info);
 }

src/kernel/main.rs

@@ -5,6 +5,7 @@
 #![no_main]
 #![feature(allocator_api)]
 #![feature(str_from_raw_parts)]
+#![feature(abi_x86_interrupt)]
 
 mod arch;
 mod boot;