sysdeps/i386/i686/stack-aliasing.h

   1 /* Define macros for stack address aliasing issues for NPTL.  i686 version.
   2    Copyright (C) 2014-2015 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* It turns out that stack coloring is in general not good on P4s.  Some
  20    applications will benefit.  We will probably have a configuration option
  21    at some point.  To enable coloring, set this to 128.  */
  22 #define COLORING_INCREMENT      0
  23
  24 /* What is useful is to avoid the 64k aliasing problem which reliably
  25    happens if all stacks use sizes which are a multiple of 64k.  Tell
  26    the stack allocator to disturb this by allocation one more page if
  27    necessary.  */
  28 #define MULTI_PAGE_ALIASING     65536