From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Wed, 27 Jan 2016 09:22:42 -0500
Subject: [PATCH] Make grub_fatal() also backtrace.

---
 grub-core/Makefile.core.def     |  3 ++
 grub-core/kern/misc.c           |  8 +++++-
 grub-core/lib/arm64/backtrace.c | 62 +++++++++++++++++++++++++++++++++++++++++
 grub-core/lib/backtrace.c       |  2 ++
 grub-core/lib/i386/backtrace.c  | 14 +++++++++-
 5 files changed, 87 insertions(+), 2 deletions(-)
 create mode 100644 grub-core/lib/arm64/backtrace.c

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 991891a6e..27563743b 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -175,6 +175,9 @@ kernel = {
 
   softdiv = lib/division.c;
 
+  x86 = lib/i386/backtrace.c;
+  x86 = lib/backtrace.c;
+
   i386 = kern/i386/dl.c;
   i386_xen = kern/i386/dl.c;
 
diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
index f1fab7000..5ce89a40c 100644
--- a/grub-core/kern/misc.c
+++ b/grub-core/kern/misc.c
@@ -24,6 +24,7 @@
 #include <grub/term.h>
 #include <grub/env.h>
 #include <grub/i18n.h>
+#include <grub/backtrace.h>
 
 union printf_arg
 {
@@ -1101,8 +1102,13 @@ grub_xasprintf (const char *fmt, ...)
 static void __attribute__ ((noreturn))
 grub_abort (void)
 {
+#ifndef GRUB_UTIL
+#if defined(__i386__) || defined(__x86_64__)
+  grub_backtrace();
+#endif
+#endif
   grub_printf ("\nAborted.");
-  
+
 #ifndef GRUB_UTIL
   if (grub_term_inputs)
 #endif
diff --git a/grub-core/lib/arm64/backtrace.c b/grub-core/lib/arm64/backtrace.c
new file mode 100644
index 000000000..1079b5380
--- /dev/null
+++ b/grub-core/lib/arm64/backtrace.c
@@ -0,0 +1,62 @@
+/*
+ *  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 (int frame)
+{
+  while (1)
+    {
+      void *lp = __builtin_return_address (frame);
+      if (!lp)
+	break;
+
+      lp = __builtin_extract_return_addr (lp);
+
+      grub_printf ("%p: ", lp);
+      grub_backtrace_print_address (lp);
+      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)
+{
+  grub_backtrace_pointer (1);
+}
+
diff --git a/grub-core/lib/backtrace.c b/grub-core/lib/backtrace.c
index 825a8800e..c0ad6ab8b 100644
--- a/grub-core/lib/backtrace.c
+++ b/grub-core/lib/backtrace.c
@@ -29,6 +29,7 @@ GRUB_MOD_LICENSE ("GPLv3+");
 void
 grub_backtrace_print_address (void *addr)
 {
+#ifndef GRUB_UTIL
   grub_dl_t mod;
 
   FOR_DL_MODULES (mod)
@@ -44,6 +45,7 @@ grub_backtrace_print_address (void *addr)
 	}
   }
 
+#endif
   grub_printf ("%p", addr);
 }
 
diff --git a/grub-core/lib/i386/backtrace.c b/grub-core/lib/i386/backtrace.c
index c3e03c727..c67273db3 100644
--- a/grub-core/lib/i386/backtrace.c
+++ b/grub-core/lib/i386/backtrace.c
@@ -15,11 +15,23 @@
  *  You should have received a copy of the GNU General Public License
  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  */
+#include <config.h>
+#ifdef GRUB_UTIL
+#define REALLY_GRUB_UTIL GRUB_UTIL
+#undef GRUB_UTIL
+#endif
+
+#include <grub/symbol.h>
+#include <grub/dl.h>
+
+#ifdef REALLY_GRUB_UTIL
+#define GRUB_UTIL REALLY_GRUB_UTIL
+#undef REALLY_GRUB_UTIL
+#endif
 
 #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>