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>