Last change
on this file since 78298 was 76553, checked in by vboxsync, 6 years ago |
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1 | ; $Id: __U8RS.asm 76553 2019-01-01 01:45:53Z vboxsync $
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2 | ;; @file
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3 | ; Compiler support routines.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2012-2019 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 |
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18 |
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19 | ;*******************************************************************************
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20 | ;* Exported Symbols *
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21 | ;*******************************************************************************
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22 | public __U8RS
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23 |
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24 |
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25 | .8086
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26 |
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27 | _TEXT segment public 'CODE' use16
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28 | assume cs:_TEXT
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29 |
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30 | ;;
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31 | ; 64-bit unsigned right shift.
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32 | ;
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33 | ; @param ax:bx:cx:dx Value. (AX is the most significant, DX the least)
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34 | ; @param si Shift count.
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35 | ; @returns ax:bx:cx:dx Shifted value.
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36 | ; si is zeroed
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37 | ;
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38 | __U8RS:
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39 |
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40 | test si, si
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41 | jz u8rs_quit
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42 | u8rs_rot:
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43 | shr ax, 1
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44 | rcr bx, 1
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45 | rcr cx, 1
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46 | rcr dx, 1
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47 | dec si
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48 | jnz u8rs_rot
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49 | u8rs_quit:
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50 | ret
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51 |
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52 | _TEXT ends
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53 | end
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54 |
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