From 7895aaff402a021a1b04645ca8d251f760e5662e Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 7 Mar 2024 16:35:51 -0500
Subject: kernel/amd64: trap: Parse TRAP_PAGEFLT error code

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/trap.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/sys/arch/amd64/amd64/trap.c b/sys/arch/amd64/amd64/trap.c
index cbcf730..b73048d 100644
--- a/sys/arch/amd64/amd64/trap.c
+++ b/sys/arch/amd64/amd64/trap.c
@@ -49,6 +49,20 @@ static const char *trap_type[] = {
 
 static const int TRAP_COUNT = __ARRAY_COUNT(trap_type);
 
+static void
+dbg_errcode(struct trapframe *tf)
+{
+    uint64_t ec = tf->error_code;
+
+    if (tf->trapno == TRAP_PAGEFLT) {
+        kprintf("bits (pwui): %c%c%c%c\n",
+                __TEST(ec, __BIT(0)) ? 'p' : '-',
+                __TEST(ec, __BIT(1)) ? 'w' : '-',
+                __TEST(ec, __BIT(2)) ? 'u' : '-',
+                __TEST(ec, __BIT(4)) ? 'i' : '-');
+    }
+}
+
 static void
 trap_print(struct trapframe *tf)
 {
@@ -57,6 +71,8 @@ trap_print(struct trapframe *tf)
     } else {
         kprintf("** Unknown trap %d **\n", tf->trapno);
     }
+
+    dbg_errcode(tf);
 }
 
 static void
-- 
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