]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/unix/sysv/linux/powerpc/powerpc64/pkey_set.c
20b372ee2983abd5a4ccd3c042ea8a197821fae9
1 /* Changing the per-thread memory protection key, powerpc64 version.
2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <arch-pkey.h>
24 pkey_set (int key
, unsigned int rights
)
26 if (key
< 0 || key
> PKEY_MAX
|| rights
> 3)
32 /* Translate to AMR bit values. */
33 unsigned long int bits
;
34 if (rights
& PKEY_DISABLE_ACCESS
)
35 /* The PKEY_DISABLE_WRITE bit does not matter. */
36 bits
= PKEY_AMR_READ
| PKEY_AMR_WRITE
;
37 else if (rights
== PKEY_DISABLE_WRITE
)
38 bits
= PKEY_AMR_WRITE
;
42 unsigned int index
= pkey_index (key
);
43 unsigned long int mask
= 3UL << index
;
44 unsigned long int amr
= pkey_read ();
45 amr
= (amr
& ~mask
) | (bits
<< index
);