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1 /* Copyright (C) 2012-2020 Free Software Foundation, Inc.
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111
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU Atomic Library (libatomic).
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5
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6 Libatomic is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "libatomic_i.h"
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26
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27
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28 /* If we use the builtin we'll get __sync_synchronize, not __kernel_dmb. */
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29 #if !DONE && N <= WORDSIZE && !defined(HAVE_DMB) && !defined(HAVE_DMB_MCR)
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30 UTYPE
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31 SIZE(libat_load) (UTYPE *mptr, int smodel)
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32 {
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33 UTYPE ret;
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34
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35 if (maybe_specialcase_relaxed(smodel))
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36 ret = *mptr;
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37 else
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38 {
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39 __kernel_dmb ();
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40 ret = *mptr;
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41 __kernel_dmb ();
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42 }
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43 return ret;
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44 }
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45
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46 #define DONE 1
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47 #endif /* !HAVE_DMB */
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48
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49 #include "../../../load_n.c"
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