summaryrefslogtreecommitdiff
path: root/sysdeps/i386/i686/stack-aliasing.h
blob: d49a92b580593a02a8c79ff37cf3963652fcae2b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
/* Define macros for stack address aliasing issues for NPTL.  i686 version.
   Copyright (C) 2014-2015 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/>.  */

/* It turns out that stack coloring is in general not good on P4s.  Some
   applications will benefit.  We will probably have a configuration option
   at some point.  To enable coloring, set this to 128.  */
#define COLORING_INCREMENT      0

/* What is useful is to avoid the 64k aliasing problem which reliably
   happens if all stacks use sizes which are a multiple of 64k.  Tell
   the stack allocator to disturb this by allocation one more page if
   necessary.  */
#define MULTI_PAGE_ALIASING     65536