diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86/pkey_get.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/x86/pkey_get.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86/pkey_get.c b/sysdeps/unix/sysv/linux/x86/pkey_get.c new file mode 100644 index 0000000000..da05ba7f84 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86/pkey_get.c @@ -0,0 +1,33 @@ +/* Reading the per-thread memory protection key, x86_64 version. + Copyright (C) 2017-2018 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/>. */ + +#include <arch-pkey.h> +#include <errno.h> + +int +pkey_get (int key) +{ + if (key < 0 || key > 15) + { + __set_errno (EINVAL); + return -1; + } + unsigned int pkru = pkey_read (); + return (pkru >> (2 * key)) & 3; + return 0; +} |