154 lines
5.5 KiB
NASM
154 lines
5.5 KiB
NASM
;
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; Command & Conquer Red Alert(tm)
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; Copyright 2025 Electronic Arts Inc.
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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;***************************************************************************
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;** C O N F I D E N T I A L --- W E S T W O O D A S S O C I A T E S **
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;***************************************************************************
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;* *
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;* Project Name : Library *
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;* *
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;* File Name : PAGFAULT.ASM *
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;* *
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;* Programmer : Julio R Jerez *
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;* *
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;* Date : April 25,1995 *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;
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; Here are prototypes for the routines defined within this module:
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; VOID Install_Page_Fault_Handle (void) ;
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;
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; ----------------------------------------------------------------
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IDEAL ; the product runs in ideal mode
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P386 ; use 386 real mode instructions
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MODEL USE32 FLAT
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LOCALS ?? ; ?? is the symbol for a local
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WARN ; generate all warnings we can
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JUMPS ; optimize jumps if possible
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;---------------------------------------------------------------------------
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; Make some general equates for easy compatability
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;---------------------------------------------------------------------------
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DPMI_INTR EQU 31h
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PAGE_FAULT equ 0eh
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RESET_VIDEO_MODE equ -1
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GLOBAL Install_Page_Fault_Handle : NEAR
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GLOBAL Set_Video_Mode : NEAR
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GLOBAL Remove_Mouse : NEAR
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GLOBAL Remove_Keyboard_Interrupt : NEAR
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GLOBAL Remove_Timer_Interrupt : NEAR
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DATASEG
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Old_Page_Fault_handle DF ?
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Page_Fault_SS DD ?
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Page_Fault_ESP DD ?
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CODESEG
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;***************************************************************************
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;* INSTALL_PAGE_FAULT_HANDLE -- Installs new page fault handle *
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;* This function will install a new page fault handle *
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;* so in the event that we have a program crash thi handle will *
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;* remove all interrupts and then will chain to the default Page *
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;* Fault handle *
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;* *
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;* INPUT: none *
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;* *
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;* *
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;* OUTPUT: none *
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;* *
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;* PROTO: VOID Install_Page_Fault_Handle( void); *
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;* *
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;* HISTORY: 04/25/96 Created *
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;*=========================================================================*
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PROC Install_Page_Fault_Handle C NEAR
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USES eax,ebx,ecx,edx,esi,edi
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mov eax,0202h ; get address of exception handle
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mov bl,PAGE_FAULT
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int DPMI_INTR
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jc ??exit ; not action is taken
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; save addrees of default handle
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mov [dword ptr Old_Page_Fault_handle],edx
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mov [word ptr Old_Page_Fault_handle+4],cx
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; redirect default handle to a new Page Fault Handle
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mov eax,0203h
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mov bl,PAGE_FAULT
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mov cx,cs
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lea edx,[Page_Fault_Handle]
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int DPMI_INTR
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??exit:
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ret
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ENDP Install_Page_Fault_Handle
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;***************************************************************************
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;* PAGE_FAULT_HANDLE -- This *
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;* *
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;* *
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;* *
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;* HISTORY: 04/25/96 Created *
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;*=========================================================================*
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PROC Page_Fault_Handle far
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; preserve used registers
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push eax
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push ebx
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; save Page Fault satck frame
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mov ax,ss
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mov [Page_Fault_SS],eax
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mov [Page_Fault_ESP],esp
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; retrieve application original stack frame
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mov eax , [ esp + ( 6 + 2 ) * 4 ]
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mov ebx , [ esp + ( 7 + 2 ) * 4 ]
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mov ss , bx
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mov esp , eax
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; set video mode to standard text mode
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push RESET_VIDEO_MODE
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call Set_Video_Mode
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pop eax
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call Remove_Mouse
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call Remove_Keyboard_Interrupt
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call Remove_Timer_Interrupt
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; restore Page Fault stack frame
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mov eax,[Page_Fault_SS]
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mov ss , ax
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mov esp, [Page_Fault_ESP]
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; restore used registers and chain to default Page Fault Handle
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pop ebx
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pop eax
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jmp [fword Old_Page_Fault_handle]
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ENDP Page_Fault_Handle
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;***************************************************************************
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;* End of File. *
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;***************************************************************************
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END
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