From 00761c54b2a41007e611a2470669b334618152b9 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Fri, 18 Oct 2019 22:28:39 +0200
Subject: Improved error logging and debugging possibilities

---
 src/kernel/interrupts/isr.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'src/kernel/interrupts/isr.c')

diff --git a/src/kernel/interrupts/isr.c b/src/kernel/interrupts/isr.c
index d4f2e3d..b615816 100644
--- a/src/kernel/interrupts/isr.c
+++ b/src/kernel/interrupts/isr.c
@@ -145,9 +145,28 @@ const char *exception_messages[] = {
         "Reserved"
 };
 
-// Master exception handler - halt via endless loop
+// Master exception/interrupt/fault handler - halt via panic
 void fault_handler(struct regs *r) {
     if (r->int_no < 32) {
+        uint32_t faulting_address;
+        asm volatile("mov %%cr2, %0" : "=r" (faulting_address));
+
+        serial_write("\n[DEBUG]\nEIP: ");
+        serial_write_hex(r->eip);
+        serial_write("\nEAX: ");
+        serial_write_hex(r->eax);
+        serial_write("\nEBX: ");
+        serial_write_hex(r->ebx);
+        serial_write("\nECX: ");
+        serial_write_hex(r->ecx);
+        serial_write("\nEDX: ");
+        serial_write_hex(r->edx);
+        serial_write("\nFaulting address: ");
+        serial_write_hex(faulting_address);
+        serial_write("\nError flags: ");
+        serial_write_hex(r->eflags);
+        serial_write("\nError code: ");
+        serial_write_hex(r->err_code);
         char *message = (char *) exception_messages[r->int_no];
         strcat(message, " Exception");
         panic(message);
-- 
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