From 36b98320534a7029e3afc578eff30b5b3ce50595 Mon Sep 17 00:00:00 2001
From: Gabriel <gabscoarnec@gmail.com>
Date: Sat, 15 Feb 2025 22:19:08 +0100
Subject: [PATCH] core/x86_64: Add general protection fault handler

---
 core/src/arch/x86_64/interrupts.zig | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/core/src/arch/x86_64/interrupts.zig b/core/src/arch/x86_64/interrupts.zig
index 4befa36..128f5c7 100644
--- a/core/src/arch/x86_64/interrupts.zig
+++ b/core/src/arch/x86_64/interrupts.zig
@@ -74,6 +74,7 @@ export fn asmInterruptEntry() callconv(.Naked) void {
 }
 
 const Exceptions = enum(u64) {
+    GeneralProtectionFault = 0xd,
     PageFault = 0xe,
 };
 
@@ -87,6 +88,17 @@ const PageFaultCodes = enum(u64) {
 
 const SYSCALL_INTERRUPT = 66;
 
+fn generalProtectionFault(frame: *InterruptStackFrame) void {
+    debug.print("General protection fault!\n", .{});
+    debug.print("Faulting instruction: {x}\n", .{frame.rip});
+
+    const code = frame.error_or_irq;
+
+    debug.print("Error code: {d}\n", .{code});
+
+    while (true) {}
+}
+
 fn pageFault(frame: *InterruptStackFrame) void {
     var fault_address: u64 = undefined;
     asm volatile ("mov %%cr2, %[cr2]"
@@ -132,6 +144,9 @@ export fn interruptEntry(frame: *InterruptStackFrame) callconv(.C) void {
         @intFromEnum(Exceptions.PageFault) => {
             pageFault(frame);
         },
+        @intFromEnum(Exceptions.GeneralProtectionFault) => {
+            generalProtectionFault(frame);
+        },
         SYSCALL_INTERRUPT => {
             var args = sys.Arguments{ .arg0 = frame.rdi, .arg1 = frame.rsi, .arg2 = frame.rdx, .arg3 = frame.r10, .arg4 = frame.r8, .arg5 = frame.r9 };
             sys.invokeSyscall(frame.rax, frame, &args, @ptrFromInt(@as(usize, @intFromPtr(&frame.rax))));