From 0a79c17307d633bb6970502e1d2569879c132848 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Mon, 10 May 2021 11:34:14 -0600
Subject: [PATCH] Show meaning of CODE on page fault

---
 src/arch/x86_64/interrupt/exception.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/arch/x86_64/interrupt/exception.rs b/src/arch/x86_64/interrupt/exception.rs
index 621379f..48c0353 100644
--- a/src/arch/x86_64/interrupt/exception.rs
+++ b/src/arch/x86_64/interrupt/exception.rs
@@ -134,6 +134,11 @@ interrupt_error!(page, |stack| {
     let cr2: usize;
     asm!("mov {}, cr2", out(reg) cr2);
     println!("Page fault: {:>016X}", cr2);
+    println!("  Present: {}", stack.code & 1 << 0 != 0);
+    println!("  Write: {}", stack.code & 1 << 1 != 0);
+    println!("  User: {}", stack.code & 1 << 2 != 0);
+    println!("  Reserved write: {}", stack.code & 1 << 3 != 0);
+    println!("  Instruction fetch: {}", stack.code & 1 << 4 != 0);
     stack.dump();
     stack_trace();
     ksignal(SIGSEGV);