From d4522b8e9854178473adcea0fbb84f23f6e744bd Mon Sep 17 00:00:00 2001
From: Felipe Boeira <felipe.boeira@liu.se>
Date: Tue, 8 Jan 2019 18:39:03 +0100
Subject: Initial commit

---
 src/lib/debug.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 src/lib/debug.c

(limited to 'src/lib/debug.c')

diff --git a/src/lib/debug.c b/src/lib/debug.c
new file mode 100644
index 0000000..6d7c9e1
--- /dev/null
+++ b/src/lib/debug.c
@@ -0,0 +1,32 @@
+#include <debug.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+/* Prints the call stack, that is, a list of addresses, one in
+   each of the functions we are nested within.  gdb or addr2line
+   may be applied to kernel.o to translate these into file names,
+   line numbers, and function names.  */
+void
+debug_backtrace (void) 
+{
+  static bool explained;
+  void **frame;
+  
+  printf ("Call stack:");
+  for (frame = __builtin_frame_address (0);
+       frame != NULL && frame[0] != NULL;
+       frame = frame[0]) 
+    printf (" %p", frame[1]);
+  printf (".\n");
+
+  if (!explained) 
+    {
+      explained = true;
+      printf ("The `backtrace' program can make call stacks useful.\n"
+              "Read \"Backtraces\" in the \"Debugging Tools\" chapter\n"
+              "of the Pintos documentation for more information.\n");
+    }
+}
-- 
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