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) 2006-2007 Sun Microsystems, Inc.
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7 | ;
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8 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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9 | ; available from http://www.virtualbox.org. This file is free software;
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10 | ; you can redistribute it and/or modify it under the terms of the GNU
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11 | ; General Public License (GPL) as published by the Free Software
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12 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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13 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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14 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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15 | ;
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16 | ; The contents of this file may alternatively be used under the terms
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17 | ; of the Common Development and Distribution License Version 1.0
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18 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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19 | ; VirtualBox OSE distribution, in which case the provisions of the
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20 | ; CDDL are applicable instead of those of the GPL.
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21 | ;
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22 | ; You may elect to license modified versions of this file under the
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23 | ; terms and conditions of either the GPL or the CDDL or both.
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24 | ;
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25 | ; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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26 | ; Clara, CA 95054 USA or visit http://www.sun.com if you need
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27 | ; additional information or have any questions.
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28 | ;
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29 |
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30 | ;*******************************************************************************
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31 | ;* Header Files *
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32 | ;*******************************************************************************
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33 | %include "iprt/asmdefs.mac"
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34 |
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35 | BEGINCODE
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36 |
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37 | ;;
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38 | ; @returns al Current *pu8 value
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39 | ; @param rcx pu8 Pointer to the 8-bit variable to update.
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40 | ; @param dl u8 The 8-bit value to assign to *pu8.
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41 | BEGINPROC_EXPORTED ASMAtomicXchgU8
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42 | xchg [rcx], dl
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43 | movzx eax, dl
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44 | ret
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45 | ENDPROC ASMAtomicXchgU8
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46 |
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