1 files changed, 66 insertions, 0 deletions
diff --git a/grub-core/lib/i386/backtrace.c b/grub-core/lib/i386/backtrace.c
new file mode 100644
index 0000000..c3e03c7
--- /dev/null
+++ b/grub-core/lib/i386/backtrace.c
@@ -0,0 +1,66 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/command.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/term.h>
+#include <grub/backtrace.h>
+
+#define MAX_STACK_FRAME 102400
+
+void
+grub_backtrace_pointer (void *ebp)
+{
+  void *ptr, *nptr;
+  unsigned i;
+
+  ptr = ebp;
+  while (1)
+    {
+      grub_printf ("%p: ", ptr);
+      grub_backtrace_print_address (((void **) ptr)[1]);
+      grub_printf (" (");
+      for (i = 0; i < 2; i++)
+	grub_printf ("%p,", ((void **)ptr) [i + 2]);
+      grub_printf ("%p)\n", ((void **)ptr) [i + 2]);
+      nptr = *(void **)ptr;
+      if (nptr < ptr || (void **) nptr - (void **) ptr > MAX_STACK_FRAME
+	  || nptr == ptr)
+	{
+	  grub_printf ("Invalid stack frame at %p (%p)\n", ptr, nptr);
+	  break;
+	}
+      ptr = nptr;
+    }
+}
+
+void
+grub_backtrace (void)
+{
+#ifdef __x86_64__
+  asm volatile ("movq %%rbp, %%rdi\n"
+		"callq *%%rax": :"a"(grub_backtrace_pointer));
+#else
+  asm volatile ("movl %%ebp, %%eax\n"
+		"calll *%%ecx": :"c"(grub_backtrace_pointer));
+#endif
+}
+