diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h')
-rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h | 44 |
1 files changed, 0 insertions, 44 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 deleted file mode 100644 index 8d474d0d04..0000000000 --- a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h +++ /dev/null @@ -1,44 +0,0 @@ -/* Optional code to distinguish library flavours. x86-64 version. - Copyright (C) 2015-2017 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_arch_Prefer_MAP_32BIT_EXEC] \ - |= bit_arch_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 */ |