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Last change
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Copyright year updates by scm.
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File size:
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| 1 | ; $Id: __U8RS.asm 106061 2024-09-16 14:03:52Z 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) 2012-2024 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 __U8RS
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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 unsigned right 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 | __U8RS:
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| 49 |
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| 50 | test si, si
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| 51 | jz u8rs_quit
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| 52 | u8rs_rot:
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| 53 | shr ax, 1
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| 54 | rcr bx, 1
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| 55 | rcr cx, 1
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| 56 | rcr dx, 1
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| 57 | dec si
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| 58 | jnz u8rs_rot
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| 59 | u8rs_quit:
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| 60 | ret
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| 61 |
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| 62 | _TEXT ends
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| 63 | end
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| 64 |
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