Clean up stack-coloring macros.

1 files changed, 28 insertions, 0 deletions

diff --git a/sysdeps/i386/i686/stack-aliasing.h b/sysdeps/i386/i686/stack-aliasing.h
new file mode 100644
index 0000000000..1e35ceb206
--- /dev/null
+++ b/sysdeps/i386/i686/stack-aliasing.h
@@ -0,0 +1,28 @@
+/* Define macros for stack address aliasing issues for NPTL.  i686 version.
+   Copyright (C) 2014 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