From 912d2e3c7eb1baa71dda2c0a28aa5809eaa96f27 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 16 Jul 2022 13:33:00 +0200
Subject: amd64: barely boot into kernel code

---
 src/kernel/arch/amd64/debug.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 src/kernel/arch/amd64/debug.c

(limited to 'src/kernel/arch/amd64/debug.c')

diff --git a/src/kernel/arch/amd64/debug.c b/src/kernel/arch/amd64/debug.c
new file mode 100644
index 0000000..52127da
--- /dev/null
+++ b/src/kernel/arch/amd64/debug.c
@@ -0,0 +1,18 @@
+#include <kernel/arch/generic.h>
+
+void *debug_caller(size_t depth) {
+	void **rbp;
+	asm("mov %%rbp, %0" 
+	    : "=r" (rbp));
+	while (depth--) {
+		if (!rbp) return NULL;
+		rbp = *rbp;
+	}
+	return rbp[1];
+}
+
+void debug_stacktrace(void) {
+	for (size_t i = 0; i < 16; i++) {
+		kprintf("  k/%08x\n", (uintptr_t)debug_caller(i));
+	}
+}
-- 
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