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44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* Reading the per-thread memory protection key, powerpc64 version.
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <arch-pkey.h>
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#include <errno.h>
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#include <sys/mman.h>
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int
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__pkey_get (int key)
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{
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if (key < 0 || key > PKEY_MAX)
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{
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__set_errno (EINVAL);
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return -1;
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}
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unsigned int index = pkey_index (key);
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unsigned long int amr = pkey_read ();
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unsigned int bits = (amr >> index) & 3;
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/* Translate from AMR values. PKEY_AMR_READ standing alone is not
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currently representable. */
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if (bits & PKEY_AMR_READ)
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return PKEY_DISABLE_ACCESS;
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else if (bits == PKEY_AMR_WRITE)
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return PKEY_DISABLE_WRITE;
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return 0;
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}
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libc_hidden_def (__pkey_get)
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weak_alias (__pkey_get, pkey_get)
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