1 | ;; @file
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2 | ; IPRT - ASMAtomicXchgU8().
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3 | ;
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4 |
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5 | ;
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6 | ; Copyright (C) 2006-2024 Oracle and/or its affiliates.
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7 | ;
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8 | ; This file is part of VirtualBox base platform packages, as
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9 | ; available from https://www.virtualbox.org.
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10 | ;
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11 | ; This program is free software; you can redistribute it and/or
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12 | ; modify it under the terms of the GNU General Public License
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13 | ; as published by the Free Software Foundation, in version 3 of the
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14 | ; License.
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15 | ;
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16 | ; This program is distributed in the hope that it will be useful, but
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17 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 | ; General Public License for more details.
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20 | ;
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21 | ; You should have received a copy of the GNU General Public License
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22 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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23 | ;
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24 | ; The contents of this file may alternatively be used under the terms
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25 | ; of the Common Development and Distribution License Version 1.0
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26 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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27 | ; in the VirtualBox distribution, in which case the provisions of the
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28 | ; CDDL are applicable instead of those of the GPL.
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29 | ;
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30 | ; You may elect to license modified versions of this file under the
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31 | ; terms and conditions of either the GPL or the CDDL or both.
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32 | ;
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33 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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34 | ;
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35 |
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36 | ;*******************************************************************************
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37 | ;* Header Files *
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38 | ;*******************************************************************************
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39 | %include "iprt/asmdefs.mac"
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40 |
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41 | BEGINCODE
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42 |
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43 | ;;
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44 | ; @returns al Current *pu8 value
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45 | ; @param rcx pu8 Pointer to the 8-bit variable to update.
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46 | ; @param dl u8 The 8-bit value to assign to *pu8.
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47 | RT_BEGINPROC ASMAtomicXchgU8
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48 | xchg [rcx], dl
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49 | movzx eax, dl
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50 | ret
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51 | ENDPROC ASMAtomicXchgU8
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52 |
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