glibc/ports/sysdeps/arm/frame.h

/* Definition of stack frame structure.  ARM/APCS version.
   Copyright (C) 2000-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

/* This is the APCS stack backtrace structure.  */
struct layout
{
  struct layout *__unbounded next;
  void *__unbounded sp;
  void *__unbounded return_address;
};

#define FIRST_FRAME_POINTER ADVANCE_STACK_FRAME (__builtin_frame_address (0))