libgcc/config/arm/unwind-arm-vxworks.c

   1 /* Support for ARM EABI unwinding in VxWorks Downloadable Kernel Modules.
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   3
   4    This file is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 3, or (at your option) any
   7    later version.
   8
   9    This file is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    Under Section 7 of GPL version 3, you are granted additional
  15    permissions described in the GCC Runtime Library Exception, version
  16    3.1, as published by the Free Software Foundation.
  17
  18    You should have received a copy of the GNU General Public License and
  19    a copy of the GCC Runtime Library Exception along with this program;
  20    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21    <http://www.gnu.org/licenses/>.  */
  22
  23 #if defined(__vxworks) && !defined (__RTP__)
  24 /* Vxworks for ARM uses __gnu_Unwind_Find_exidx to retrieve the exception
  25    table for downloadable kernel modules.  As those modules are only partially
  26    linked, the linker won't generate __exidx_start|end, but the two symbols
  27    are still used in alternate paths from unwind-arm-common.inc.
  28
  29    As we don't rely on them, but still need the symbols, we define dummy
  30    values here.  */
  31 void *__exidx_start __attribute__((__visibility__ ("hidden")));
  32 void *__exidx_end __attribute__((__visibility__ ("hidden")));
  33 #endif