| 1 | ; $Id: bs3-cmn-SelFlatCodeToProtFar16.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3SelFlatCodeToProtFar16.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2020 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 | ;*********************************************************************************************************************************
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| 29 | ;* Header Files *
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| 30 | ;*********************************************************************************************************************************
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| 31 | %include "bs3kit-template-header.mac"
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| 32 |
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| 33 |
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| 34 | ;*********************************************************************************************************************************
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| 35 | ;* External Symbols *
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| 36 | ;*********************************************************************************************************************************
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| 37 | BS3_EXTERN_CMN Bs3SelFlatCodeToRealMode
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| 38 | BS3_EXTERN_CMN Bs3SelRealModeCodeToProtMode
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| 39 | TMPL_BEGIN_TEXT
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| 40 |
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| 41 |
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| 42 | ;;
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| 43 | ; @cproto BS3_CMN_PROTO(uint32_t, Bs3SelRealModeCodeToProtMode,(uint32_t uFlatAddr), false);
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| 44 | ;
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| 45 | ; @uses Only return registers (ax:dx, eax, eax)
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| 46 | ;
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| 47 | BS3_PROC_BEGIN_CMN Bs3SelFlatCodeToProtFar16, BS3_PBC_NEAR
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| 48 | BS3_CALL_CONV_PROLOG 1
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| 49 | push xBP
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| 50 | mov xBP, xSP
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| 51 |
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| 52 | ;
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| 53 | ; Call Bs3SelFlatCodeToRealMode and then Bs3SelRealModeCodeToProtMode.
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| 54 | ; This avoid some code duplication.
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| 55 | ;
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| 56 | %if TMPL_BITS == 16
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| 57 | push word [xBP + xCB + cbCurRetAddr + 2]
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| 58 | push word [xBP + xCB + cbCurRetAddr]
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| 59 | call Bs3SelFlatCodeToRealMode
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| 60 | add sp, 4h
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| 61 |
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| 62 | push ax ; save the offset as it will be the same.
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| 63 |
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| 64 | push dx
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| 65 | call Bs3SelRealModeCodeToProtMode
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| 66 | add sp, 2h
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| 67 |
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| 68 | mov dx, ax ; The protected mode selector.
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| 69 | pop ax ; The offset.
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| 70 |
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| 71 | %elif TMPL_BITS == 32
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| 72 | push dword [xBP + xCB + cbCurRetAddr]
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| 73 | call Bs3SelFlatCodeToRealMode
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| 74 | add esp, 4h
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| 75 |
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| 76 | push eax ; save the result.
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| 77 |
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| 78 | shr eax, 16
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| 79 | push eax
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| 80 | call Bs3SelRealModeCodeToProtMode
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| 81 | add esp, 4h
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| 82 |
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| 83 | mov [esp + 2], ax ; Update the selector before popping the result.
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| 84 | pop eax
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| 85 |
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| 86 | %elif TMPL_BITS == 64
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| 87 | push xCX ; Preserve RCX to make the behaviour uniform.
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| 88 | sub xSP, 28h ; 20h bytes of calling convention scratch and 8 byte for saving the result.
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| 89 |
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| 90 | mov ecx, [xBP + xCB + cbCurRetAddr] ; move straight to parameter 0 register.
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| 91 | call Bs3SelFlatCodeToRealMode
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| 92 |
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| 93 | mov [xBP - xCB*2], eax ; Save the result.
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| 94 |
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| 95 | shr eax, 16
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| 96 | mov ecx, eax ; Move straight to parameter 0 register.
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| 97 | call Bs3SelRealModeCodeToProtMode
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| 98 |
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| 99 | shl eax, 16 ; Shift prot mode selector into result position.
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| 100 | mov ax, [xBP - xCB*2] ; The segment offset from the previous call.
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| 101 |
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| 102 | add xSP, 28h
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| 103 | pop xCX
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| 104 | %else
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| 105 | %error "TMPL_BITS=" TMPL_BITS "!"
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| 106 | %endif
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| 107 | pop xBP
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| 108 | BS3_CALL_CONV_EPILOG 1
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| 109 | BS3_HYBRID_RET
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| 110 | BS3_PROC_END_CMN Bs3SelFlatCodeToProtFar16
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| 111 |
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| 112 |
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| 113 | ;
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| 114 | ; We may be using the near code in some critical code paths, so don't
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| 115 | ; penalize it.
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| 116 | ;
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| 117 | BS3_CMN_FAR_STUB Bs3SelFlatCodeToProtFar16, 4
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| 118 |
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