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1 | ; $Id: __U8LS.asm 98103 2023-01-17 14:15:46Z 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) 2012-2023 Oracle and/or its affiliates.
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8 | ;
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9 | ; This file is part of VirtualBox base platform packages, as
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10 | ; available from https://www.virtualbox.org.
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11 | ;
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12 | ; This program is free software; you can redistribute it and/or
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13 | ; modify it under the terms of the GNU General Public License
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14 | ; as published by the Free Software Foundation, in version 3 of the
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15 | ; License.
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16 | ;
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17 | ; This program is distributed in the hope that it will be useful, but
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18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | ; General Public License for more details.
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21 | ;
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22 | ; You should have received a copy of the GNU General Public License
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23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | ;
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25 | ; SPDX-License-Identifier: GPL-3.0-only
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26 | ;
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27 |
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28 |
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29 | ;*******************************************************************************
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30 | ;* Exported Symbols *
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31 | ;*******************************************************************************
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32 | public __U8LS
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33 |
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34 |
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35 | .8086
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36 |
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37 | _TEXT segment public 'CODE' use16
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38 | assume cs:_TEXT
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39 |
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40 | ;;
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41 | ; 64-bit left shift.
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42 | ;
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43 | ; @param ax:bx:cx:dx Value. (AX is the most significant, DX the least)
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44 | ; @param si Shift count.
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45 | ; @returns ax:bx:cx:dx Shifted value.
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46 | ; si is zeroed
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47 | ;
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48 | __U8LS:
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49 |
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50 | test si, si
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51 | jz u8ls_quit
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52 | u8ls_rot:
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53 | shl dx, 1
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54 | rcl cx, 1
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55 | rcl bx, 1
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56 | rcl ax, 1
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57 | dec si
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58 | jnz u8ls_rot
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59 | u8ls_quit:
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60 | ret
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61 |
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62 |
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63 | _TEXT ends
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64 | end
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65 |
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