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|
; $Id: bs3-cmn-TestDoModesByOneHlp.asm $
;; @file
; BS3Kit - Bs3TestDoModesByOne Helpers for switching to the bit-count of the worker function.
;
;
; Copyright (C) 2007-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"
;*********************************************************************************************************************************
;* Global Variables *
;*********************************************************************************************************************************
BS3_BEGIN_DATA16
BS3_GLOBAL_NAME_EX BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent),,0
RTCCPTR_DEF 0
;*********************************************************************************************************************************
;* Exported Symbols *
;*********************************************************************************************************************************
%ifdef BS3_STRICT
BS3_EXTERN_DATA16 g_bBs3CurrentMode
%endif
%if TMPL_BITS == 16
BS3_BEGIN_TEXT16
extern _Bs3SelRealModeCodeToProtMode_c16
%endif
;;
; @cproto FNBS3TESTDOMODE
;
; @param bMode The current mode
; @uses What allowed by calling convention and possibly mode, caller deals with it.
;
%if TMPL_BITS == 16
;
; For 16-bit workers.
;
BS3_BEGIN_TEXT16
BS3_SET_BITS 32
BS3_PROC_BEGIN _Bs3TestCallDoerTo16_c32
push xBP
mov xBP, xSP
; Load bMode into eax.
movzx eax, byte [xBP + xCB*2]
%ifdef BS3_STRICT
cmp al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
je .ok_mode
int3
.ok_mode:
%endif
; Switch to 16-bit.
extern _Bs3SwitchTo16Bit_c32
call _Bs3SwitchTo16Bit_c32
BS3_SET_BITS 16
push ax ; Worker bMode argument.
; Assuming real mode far pointer, convert protected mode before calling it.
push word [2 + BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))]
call _Bs3SelRealModeCodeToProtMode_c16
add sp, 2
push cs ; return selector
push word .return ; return address
push ax ; call converted selector
push word [BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))] ; call offset
retf
.return:
; Switch back to 32-bit mode.
extern _Bs3SwitchTo32Bit_c16
call _Bs3SwitchTo32Bit_c16
BS3_SET_BITS 32
leave
ret
BS3_PROC_END _Bs3TestCallDoerTo16_c32
BS3_SET_BITS 64
BS3_PROC_BEGIN _Bs3TestCallDoerTo16_c64
push xBP
mov xBP, xSP
; Load bMode into eax.
movzx eax, cl
%ifdef BS3_STRICT
cmp al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
je .ok_mode
int3
.ok_mode:
%endif
; Switch to 16-bit.
extern _Bs3SwitchTo16Bit_c64
call _Bs3SwitchTo16Bit_c64
BS3_SET_BITS 16
push ax ; Worker bMode argument.
; Assuming real mode far pointer, convert protected mode before calling it.
push word [2 + BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))]
call _Bs3SelRealModeCodeToProtMode_c16
add sp, 2
push cs ; return selector
push word .return ; return address
push ax ; call converted selector
push word [BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))] ; call offset
retf
.return:
; Switch back to 64-bit mode.
extern _Bs3SwitchTo64Bit_c16
call _Bs3SwitchTo64Bit_c16
BS3_SET_BITS 64
leave
ret
BS3_PROC_END _Bs3TestCallDoerTo16_c64
%elif TMPL_BITS == 32
;
; For 32-bit workers.
;
BS3_BEGIN_TEXT16
BS3_SET_BITS 16
BS3_PROC_BEGIN _Bs3TestCallDoerTo32_f16
push xBP
mov xBP, xSP
; Load bMode into eax.
movzx eax, byte [xBP + xCB + sCB]
%ifdef BS3_STRICT
cmp al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
je .ok_mode
int3
.ok_mode:
%endif
; Switch to 32-bit.
extern _Bs3SwitchTo32Bit_c16
call _Bs3SwitchTo32Bit_c16
BS3_SET_BITS 32
push eax ; Worker bMode argument.
test al, BS3_MODE_CODE_V86
jnz .return_to_v86 ; Need to figure this while we still have the mode value.
call [BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))]
; Switch back to 16-bit mode.
extern _Bs3SwitchTo16Bit_c32
call _Bs3SwitchTo16Bit_c32
BS3_SET_BITS 16
.return:
leave
retf
BS3_SET_BITS 32
.return_to_v86:
call [BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))]
; Switch back to v8086 mode.
extern _Bs3SwitchTo16BitV86_c32
call _Bs3SwitchTo16BitV86_c32
BS3_SET_BITS 16
jmp .return
BS3_PROC_END _Bs3TestCallDoerTo32_f16
BS3_BEGIN_TEXT32
BS3_SET_BITS 64
BS3_PROC_BEGIN _Bs3TestCallDoerTo32_c64
push xBP
mov xBP, xSP
; Load bMode into eax.
movzx eax, cl
%ifdef BS3_STRICT
cmp al, [BS3_DATA16_WRT(g_bBs3CurrentMode)]
je .ok_mode
int3
.ok_mode:
%endif
; Switch to 32-bit.
extern _Bs3SwitchTo32Bit_c64
call _Bs3SwitchTo32Bit_c64
BS3_SET_BITS 32
push eax ; Worker bMode argument.
call [BS3_DATA16_WRT(BS3_CMN_NM(g_pfnBs3TestDoModesByOneCurrent))]
; Switch back to 64-bit mode.
extern _Bs3SwitchTo64Bit_c32
call _Bs3SwitchTo64Bit_c32
BS3_SET_BITS 64
leave
ret
BS3_PROC_END _Bs3TestCallDoerTo32_c64
%elif TMPL_BITS == 64
;
; 64-bit workers makes no sense, so skip that.
;
%else
%error "TMPL_BITS!"
%endif
|
