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/* Reading the per-thread memory protection key, powerpc64 version.
Copyright (C) 2017-2021 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>
#include <sys/mman.h>
int
pkey_get (int key)
{
if (key < 0 || key > PKEY_MAX)
{
__set_errno (EINVAL);
return -1;
}
unsigned int index = pkey_index (key);
unsigned long int amr = pkey_read ();
unsigned int bits = (amr >> index) & 3;
/* Translate from AMR values. PKEY_AMR_READ standing alone is not
currently representable. */
if (bits & PKEY_AMR_READ)
return PKEY_DISABLE_ACCESS;
else if (bits == PKEY_AMR_WRITE)
return PKEY_DISABLE_WRITE;
return 0;
}
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