1 /* Reading the per-thread memory protection key, powerpc64 version. 2 Copyright (C) 2017-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 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. 9 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. 14 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/>. */ 18 19 #include <arch-pkey.h> 20 #include <errno.h> 21 #include <sys/mman.h> 22 23 int pkey_get(int key)24pkey_get (int key) 25 { 26 if (key < 0 || key > PKEY_MAX) 27 { 28 __set_errno (EINVAL); 29 return -1; 30 } 31 unsigned int index = pkey_index (key); 32 unsigned long int amr = pkey_read (); 33 unsigned int bits = (amr >> index) & 3; 34 35 /* Translate from AMR values. PKEY_AMR_READ standing alone is not 36 currently representable. */ 37 if (bits & PKEY_AMR_READ) 38 return PKEY_DISABLE_ACCESS; 39 else if (bits == PKEY_AMR_WRITE) 40 return PKEY_DISABLE_WRITE; 41 return 0; 42 } 43