1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h
new file mode 100644
index 0000000000..c9db5ea777
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h
@@ -0,0 +1,44 @@
+/* Optional code to distinguish library flavours.  x86-64 version.
+   Copyright (C) 2015-2016 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/>.  */
+
+#ifndef _DL_LIBRECON_H
+
+#include <sysdeps/unix/sysv/linux/dl-librecon.h>
+
+/* Recognizing extra environment variables.  For 64-bit applications,
+   branch prediction performance may be negatively impacted when the
+   target of a branch is more than 4GB away from the branch.  Add the
+   Prefer_MAP_32BIT_EXEC bit so that mmap will try to map executable
+   pages with MAP_32BIT first.  NB: MAP_32BIT will map to lower 2GB,
+   not lower 4GB, address.  Prefer_MAP_32BIT_EXEC reduces bits available
+   for address space layout randomization (ASLR).  Prefer_MAP_32BIT_EXEC
+   is always disabled for SUID programs and can be enabled by setting
+   environment variable, LD_PREFER_MAP_32BIT_EXEC.  */
+#define EXTRA_LD_ENVVARS \
+  case 21:							      \
+    if (memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0)	      \
+      GLRO(dl_x86_cpu_features).feature[index_Prefer_MAP_32BIT_EXEC]  \
+	= bit_Prefer_MAP_32BIT_EXEC;				      \
+    break;
+
+/* Extra unsecure variables.  The names are all stuffed in a single
+   string which means they have to be terminated with a '\0' explicitly.  */
+#define EXTRA_UNSECURE_ENVVARS \
+  "LD_PREFER_MAP_32BIT_EXEC\0"
+
+#endif /* dl-librecon.h */