sysdeps/generic/dl-osinfo.h

   1 /* Operating system specific code for generic dynamic loader functions.
   2    Copyright (C) 2009 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdint.h>
  21
  22 static inline uintptr_t __attribute__ ((always_inline))
  23 _dl_setup_stack_chk_guard (void *dl_random)
  24 {
  25   uintptr_t ret;
  26   if (dl_random == NULL)
  27     {
  28       ret = 0;
  29       unsigned char *p = (unsigned char *) &ret;
  30       p[sizeof (ret) - 1] = 255;
  31       p[sizeof (ret) - 2] = '\n';
  32       p[0] = 0;
  33     }
  34   else
  35     memcpy (&ret, dl_random, sizeof (ret));
  36   return ret;
  37 }
  38
  39 static inline uintptr_t __attribute__ ((always_inline))
  40 _dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard)
  41 {
  42   uintptr_t ret;
  43   if (dl_random == NULL)
  44     ret = stack_chk_guard;
  45   else
  46     memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret));
  47   return ret;
  48 }