| 1 | ; $Id: bs3-c16-SwitchFromV86To16BitAndCallC.asm 76553 2019-01-01 01:45:53Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3SwitchFromV86To16BitAndCallC
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2019 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 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | ;*********************************************************************************************************************************
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| 28 | ;* Header Files *
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| 29 | ;*********************************************************************************************************************************
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| 30 | %include "bs3kit-template-header.mac"
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| 31 | %if TMPL_BITS != 16
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| 32 | %error "16-bit only"
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| 33 | %endif
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| 34 |
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| 35 |
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| 36 | ;*********************************************************************************************************************************
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| 37 | ;* External Symbols *
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| 38 | ;*********************************************************************************************************************************
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| 39 | %ifdef BS3_STRICT
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| 40 | BS3_EXTERN_DATA16 g_bBs3CurrentMode
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| 41 | TMPL_BEGIN_TEXT
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| 42 | BS3_EXTERN_CMN Bs3Panic
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| 43 | %endif
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| 44 | BS3_EXTERN_CMN Bs3SwitchTo16Bit
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| 45 | BS3_EXTERN_CMN Bs3SwitchTo16BitV86
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| 46 | BS3_EXTERN_CMN Bs3SelRealModeCodeToProtMode
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| 47 |
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| 48 |
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| 49 | ;;
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| 50 | ; @cproto BS3_CMN_PROTO_STUB(int, Bs3SwitchFromV86To16BitAndCallC,(FPFNBS3FAR fpfnCall, unsigned cbParams, ...));
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| 51 | ;
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| 52 | BS3_PROC_BEGIN_CMN Bs3SwitchFromV86To16BitAndCallC, BS3_PBC_HYBRID
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| 53 | inc bp
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| 54 | push bp
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| 55 | mov bp, sp
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| 56 |
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| 57 | ;
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| 58 | ; Push the arguments first.
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| 59 | ;
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| 60 | mov ax, si ; save si
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| 61 | mov si, [bp + 2 + cbCurRetAddr + 4]
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| 62 | %ifdef BS3_STRICT
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| 63 | test si, 1
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| 64 | jz .cbParams_ok
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| 65 | call Bs3Panic
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| 66 | .cbParams_ok:
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| 67 | test byte [g_bBs3CurrentMode], BS3_MODE_CODE_V86
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| 68 | jnz .mode_ok
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| 69 | call Bs3Panic
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| 70 | .mode_ok:
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| 71 | %endif
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| 72 |
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| 73 | .push_more:
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| 74 | push word [bp + 2 + cbCurRetAddr + 4 + 2 + si - 2]
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| 75 | sub si, 2
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| 76 | jnz .push_more
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| 77 | mov si, ax ; restore si
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| 78 |
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| 79 | ;
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| 80 | ; Convert the code segment to a 16-bit prot mode selector
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| 81 | ;
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| 82 | push word [bp + 2 + cbCurRetAddr + 2]
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| 83 | call Bs3SelRealModeCodeToProtMode
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| 84 | mov [bp + 2 + cbCurRetAddr + 2], ax
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| 85 | add sp, 2
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| 86 |
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| 87 | ;
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| 88 | ; Switch mode.
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| 89 | ;
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| 90 | call Bs3SwitchTo16Bit
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| 91 | call far [bp + 2 + cbCurRetAddr]
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| 92 | call Bs3SwitchTo16BitV86
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| 93 |
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| 94 | mov sp, bp
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| 95 | pop bp
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| 96 | dec bp
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| 97 | BS3_HYBRID_RET
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| 98 | BS3_PROC_END_CMN Bs3SwitchFromV86To16BitAndCallC
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| 99 |
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