/* Changing the per-thread memory protection key, powerpc64 version.

   Copyright (C) 2017-2020 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_set (int key, unsigned int rights)

{

  if (key < 0 || key > PKEY_MAX || rights > 3)

    {

      __set_errno (EINVAL);

      return -1;

    }

  /* Translate to AMR bit values.  */

  unsigned long int bits;

  if (rights & PKEY_DISABLE_ACCESS)

    /* The PKEY_DISABLE_WRITE bit does not matter.  */

    bits = PKEY_AMR_READ | PKEY_AMR_WRITE;

  else if (rights == PKEY_DISABLE_WRITE)

    bits = PKEY_AMR_WRITE;

  else

    bits = 0;

  unsigned int index = pkey_index (key);

  unsigned long int mask = 3UL << index;

  unsigned long int amr = pkey_read ();

  amr = (amr & ~mask) | (bits << index);

  pkey_write (amr);

  return 0;

}